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Diffstat (limited to 'src/exim.c')
| -rw-r--r-- | src/exim.c | 6097 |
1 files changed, 6097 insertions, 0 deletions
diff --git a/src/exim.c b/src/exim.c new file mode 100644 index 0000000..fd01d13 --- /dev/null +++ b/src/exim.c @@ -0,0 +1,6097 @@ +/************************************************* +* Exim - an Internet mail transport agent * +*************************************************/ + +/* Copyright (c) The Exim Maintainers 2020 - 2022 */ +/* Copyright (c) University of Cambridge 1995 - 2018 */ +/* See the file NOTICE for conditions of use and distribution. */ + + +/* The main function: entry point, initialization, and high-level control. +Also a few functions that don't naturally fit elsewhere. */ + + +#include "exim.h" + +#if defined(__GLIBC__) && !defined(__UCLIBC__) +# include <gnu/libc-version.h> +#endif + +#ifdef USE_GNUTLS +# include <gnutls/gnutls.h> +# if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP) +# define DISABLE_OCSP +# endif +#endif + +#ifndef _TIME_H +# include <time.h> +#endif + +extern void init_lookup_list(void); + + + +/************************************************* +* Function interface to store functions * +*************************************************/ + +/* We need some real functions to pass to the PCRE regular expression library +for store allocation via Exim's store manager. The normal calls are actually +macros that pass over location information to make tracing easier. These +functions just interface to the standard macro calls. A good compiler will +optimize out the tail recursion and so not make them too expensive. */ + +static void * +function_store_malloc(PCRE2_SIZE size, void * tag) +{ +return store_malloc((int)size); +} + +static void +function_store_free(void * block, void * tag) +{ +/* At least some version of pcre2 pass a null pointer */ +if (block) store_free(block); +} + + + + +/************************************************* +* Enums for cmdline interface * +*************************************************/ + +enum commandline_info { CMDINFO_NONE=0, + CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP }; + + + + +/************************************************* +* Compile regular expression and panic on fail * +*************************************************/ + +/* This function is called when failure to compile a regular expression leads +to a panic exit. In other cases, pcre_compile() is called directly. In many +cases where this function is used, the results of the compilation are to be +placed in long-lived store, so we temporarily reset the store management +functions that PCRE uses if the use_malloc flag is set. + +Argument: + pattern the pattern to compile + caseless TRUE if caseless matching is required + use_malloc TRUE if compile into malloc store + +Returns: pointer to the compiled pattern +*/ + +const pcre2_code * +regex_must_compile(const uschar * pattern, BOOL caseless, BOOL use_malloc) +{ +size_t offset; +int options = caseless ? PCRE_COPT|PCRE2_CASELESS : PCRE_COPT; +const pcre2_code * yield; +int err; +pcre2_general_context * gctx; +pcre2_compile_context * cctx; + +if (use_malloc) + { + gctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL); + cctx = pcre2_compile_context_create(gctx); + } +else + cctx = pcre_cmp_ctx; + +if (!(yield = pcre2_compile((PCRE2_SPTR)pattern, PCRE2_ZERO_TERMINATED, options, + &err, &offset, cctx))) + { + uschar errbuf[128]; + pcre2_get_error_message(err, errbuf, sizeof(errbuf)); + log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: " + "%s at offset %ld while compiling %s", errbuf, (long)offset, pattern); + } + +if (use_malloc) + { + pcre2_compile_context_free(cctx); + pcre2_general_context_free(gctx); + } +return yield; +} + + +static void +pcre_init(void) +{ +pcre_gen_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL); +pcre_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx); +pcre_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx); +} + + + + +/************************************************* +* Execute regular expression and set strings * +*************************************************/ + +/* This function runs a regular expression match, and sets up the pointers to +the matched substrings. The matched strings are copied so the lifetime of +the subject is not a problem. + +Arguments: + re the compiled expression + subject the subject string + options additional PCRE options + setup if < 0 do full setup + if >= 0 setup from setup+1 onwards, + excluding the full matched string + +Returns: TRUE if matched, or FALSE +*/ + +BOOL +regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup) +{ +pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx); +int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0, + PCRE_EOPT | options, md, pcre_mtc_ctx); +BOOL yield; + +if ((yield = (res >= 0))) + { + res = pcre2_get_ovector_count(md); + expand_nmax = setup < 0 ? 0 : setup + 1; + for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++) + { + PCRE2_SIZE len; + pcre2_substring_get_bynumber(md, matchnum, + (PCRE2_UCHAR **)&expand_nstring[expand_nmax], &len); + expand_nlength[expand_nmax++] = (int)len; + } + expand_nmax--; + } +else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any) + { + uschar errbuf[128]; + pcre2_get_error_message(res, errbuf, sizeof(errbuf)); + debug_printf_indent("pcre2: %s\n", errbuf); + } +pcre2_match_data_free(md); +return yield; +} + + +/* Check just for match with regex. Uses the common memory-handling. + +Arguments: + re compiled regex + subject string to be checked + slen length of subject; -1 for nul-terminated + rptr pointer for matched string, copied, or NULL + +Return: TRUE for a match. +*/ + +BOOL +regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr) +{ +pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx); +int rc = pcre2_match(re, (PCRE2_SPTR)subject, + slen >= 0 ? slen : PCRE2_ZERO_TERMINATED, + 0, PCRE_EOPT, md, pcre_mtc_ctx); +PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md); +if (rc < 0) + return FALSE; +if (rptr) + *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]); +return TRUE; +} + + + +/************************************************* +* Set up processing details * +*************************************************/ + +/* Save a text string for dumping when SIGUSR1 is received. +Do checks for overruns. + +Arguments: format and arguments, as for printf() +Returns: nothing +*/ + +void +set_process_info(const char *format, ...) +{ +gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info }; +gstring * g; +int len; +va_list ap; + +g = string_fmt_append(&gs, "%5d ", (int)getpid()); +len = g->ptr; +va_start(ap, format); +if (!string_vformat(g, 0, format, ap)) + { + gs.ptr = len; + g = string_cat(&gs, US"**** string overflowed buffer ****"); + } +g = string_catn(g, US"\n", 1); +string_from_gstring(g); +process_info_len = g->ptr; +DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info); +va_end(ap); +} + +/*********************************************** +* Handler for SIGTERM * +***********************************************/ + +static void +term_handler(int sig) +{ +exit(1); +} + + +/*********************************************** +* Handler for SIGSEGV * +***********************************************/ + +static void +#ifdef SA_SIGINFO +segv_handler(int sig, siginfo_t * info, void * uctx) +{ +log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr); +# if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR) +switch (info->si_code) + { + case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break; + case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break; + case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break; + case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break; + } +# endif +if (US info->si_addr < US 4096) + log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)"); +else + log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)"); +if (process_info_len > 0) + log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info); +signal(SIGSEGV, SIG_DFL); +kill(getpid(), sig); +} + +#else +segv_handler(int sig) +{ +log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)"); +if (process_info_len > 0) + log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info); +signal(SIGSEGV, SIG_DFL); +kill(getpid(), sig); +} +#endif + + +/************************************************* +* Handler for SIGUSR1 * +*************************************************/ + +/* SIGUSR1 causes any exim process to write to the process log details of +what it is currently doing. It will only be used if the OS is capable of +setting up a handler that causes automatic restarting of any system call +that is in progress at the time. + +This function takes care to be signal-safe. + +Argument: the signal number (SIGUSR1) +Returns: nothing +*/ + +static void +usr1_handler(int sig) +{ +int fd; + +os_restarting_signal(sig, usr1_handler); + +if (!process_log_path) return; +fd = log_open_as_exim(process_log_path); + +/* If we are neither exim nor root, or if we failed to create the log file, +give up. There is not much useful we can do with errors, since we don't want +to disrupt whatever is going on outside the signal handler. */ + +if (fd < 0) return; + +(void)write(fd, process_info, process_info_len); +(void)close(fd); +} + + + +/************************************************* +* Timeout handler * +*************************************************/ + +/* This handler is enabled most of the time that Exim is running. The handler +doesn't actually get used unless alarm() has been called to set a timer, to +place a time limit on a system call of some kind. When the handler is run, it +re-enables itself. + +There are some other SIGALRM handlers that are used in special cases when more +than just a flag setting is required; for example, when reading a message's +input. These are normally set up in the code module that uses them, and the +SIGALRM handler is reset to this one afterwards. + +Argument: the signal value (SIGALRM) +Returns: nothing +*/ + +void +sigalrm_handler(int sig) +{ +sigalrm_seen = TRUE; +os_non_restarting_signal(SIGALRM, sigalrm_handler); +} + + + +/************************************************* +* Sleep for a fractional time interval * +*************************************************/ + +/* This function is called by millisleep() and exim_wait_tick() to wait for a +period of time that may include a fraction of a second. The coding is somewhat +tedious. We do not expect setitimer() ever to fail, but if it does, the process +will wait for ever, so we panic in this instance. (There was a case of this +when a bug in a function that calls milliwait() caused it to pass invalid data. +That's when I added the check. :-) + +We assume it to be not worth sleeping for under 50us; this value will +require revisiting as hardware advances. This avoids the issue of +a zero-valued timer setting meaning "never fire". + +Argument: an itimerval structure containing the interval +Returns: nothing +*/ + +static void +milliwait(struct itimerval *itval) +{ +sigset_t sigmask; +sigset_t old_sigmask; +int save_errno = errno; + +if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0) + return; +(void)sigemptyset(&sigmask); /* Empty mask */ +(void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */ +(void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */ +if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */ + log_write(0, LOG_MAIN|LOG_PANIC_DIE, + "setitimer() failed: %s", strerror(errno)); +(void)sigfillset(&sigmask); /* All signals */ +(void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */ +(void)sigsuspend(&sigmask); /* Until SIGALRM */ +(void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */ +errno = save_errno; +sigalrm_seen = FALSE; +} + + + + +/************************************************* +* Millisecond sleep function * +*************************************************/ + +/* The basic sleep() function has a granularity of 1 second, which is too rough +in some cases - for example, when using an increasing delay to slow down +spammers. + +Argument: number of millseconds +Returns: nothing +*/ + +void +millisleep(int msec) +{ +struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0}, + .it_value = {.tv_sec = msec/1000, + .tv_usec = (msec % 1000) * 1000}}; +milliwait(&itval); +} + + + +/************************************************* +* Compare microsecond times * +*************************************************/ + +/* +Arguments: + tv1 the first time + tv2 the second time + +Returns: -1, 0, or +1 +*/ + +static int +exim_tvcmp(struct timeval *t1, struct timeval *t2) +{ +if (t1->tv_sec > t2->tv_sec) return +1; +if (t1->tv_sec < t2->tv_sec) return -1; +if (t1->tv_usec > t2->tv_usec) return +1; +if (t1->tv_usec < t2->tv_usec) return -1; +return 0; +} + + + + +/************************************************* +* Clock tick wait function * +*************************************************/ + +#ifdef _POSIX_MONOTONIC_CLOCK +# ifdef CLOCK_BOOTTIME +# define EXIM_CLOCKTYPE CLOCK_BOOTTIME +# else +# define EXIM_CLOCKTYPE CLOCK_MONOTONIC +# endif + +/* Amount EXIM_CLOCK is behind realtime, at startup. */ +static struct timespec offset_ts; + +static void +exim_clock_init(void) +{ +struct timeval tv; +if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return; +(void)gettimeofday(&tv, NULL); +offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec; +offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec; +if (offset_ts.tv_nsec >= 0) return; +offset_ts.tv_sec--; +offset_ts.tv_nsec += 1000*1000*1000; +} +#endif + + +void +exim_gettime(struct timeval * tv) +{ +#ifdef _POSIX_MONOTONIC_CLOCK +struct timespec now_ts; + +if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0) + { + now_ts.tv_sec += offset_ts.tv_sec; + if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000) + { + now_ts.tv_sec++; + now_ts.tv_nsec -= 1000*1000*1000; + } + tv->tv_sec = now_ts.tv_sec; + tv->tv_usec = now_ts.tv_nsec / 1000; + } +else +#endif + (void)gettimeofday(tv, NULL); +} + + +/* Exim uses a time + a pid to generate a unique identifier in two places: its +message IDs, and in file names for maildir deliveries. Because some OS now +re-use pids within the same second, sub-second times are now being used. +However, for absolute certainty, we must ensure the clock has ticked before +allowing the relevant process to complete. At the time of implementation of +this code (February 2003), the speed of processors is such that the clock will +invariably have ticked already by the time a process has done its job. This +function prepares for the time when things are faster - and it also copes with +clocks that go backwards. + +Arguments: + prev_tv A timeval which was used to create uniqueness; its usec field + has been rounded down to the value of the resolution. + We want to be sure the current time is greater than this. + On return, updated to current (rounded down). + resolution The resolution that was used to divide the microseconds + (1 for maildir, larger for message ids) + +Returns: nothing +*/ + +void +exim_wait_tick(struct timeval * prev_tv, int resolution) +{ +struct timeval now_tv; +long int now_true_usec; + +exim_gettime(&now_tv); +now_true_usec = now_tv.tv_usec; +now_tv.tv_usec = (now_true_usec/resolution) * resolution; + +while (exim_tvcmp(&now_tv, prev_tv) <= 0) + { + struct itimerval itval; + itval.it_interval.tv_sec = 0; + itval.it_interval.tv_usec = 0; + itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec; + itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec; + + /* We know that, overall, "now" is less than or equal to "then". Therefore, a + negative value for the microseconds is possible only in the case when "now" + is more than a second less than "tgt". That means that itval.it_value.tv_sec + is greater than zero. The following correction is therefore safe. */ + + if (itval.it_value.tv_usec < 0) + { + itval.it_value.tv_usec += 1000000; + itval.it_value.tv_sec -= 1; + } + + DEBUG(D_transport|D_receive) + { + if (!f.running_in_test_harness) + { + debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n", + prev_tv->tv_sec, (long) prev_tv->tv_usec, + now_tv.tv_sec, (long) now_tv.tv_usec); + debug_printf("waiting " TIME_T_FMT ".%06lu sec\n", + itval.it_value.tv_sec, (long) itval.it_value.tv_usec); + } + } + + milliwait(&itval); + + /* Be prapared to go around if the kernel does not implement subtick + granularity (GNU Hurd) */ + + exim_gettime(&now_tv); + now_true_usec = now_tv.tv_usec; + now_tv.tv_usec = (now_true_usec/resolution) * resolution; + } +*prev_tv = now_tv; +} + + + + +/************************************************* +* Call fopen() with umask 777 and adjust mode * +*************************************************/ + +/* Exim runs with umask(0) so that files created with open() have the mode that +is specified in the open() call. However, there are some files, typically in +the spool directory, that are created with fopen(). They end up world-writeable +if no precautions are taken. Although the spool directory is not accessible to +the world, this is an untidiness. So this is a wrapper function for fopen() +that sorts out the mode of the created file. + +Arguments: + filename the file name + options the fopen() options + mode the required mode + +Returns: the fopened FILE or NULL +*/ + +FILE * +modefopen(const uschar *filename, const char *options, mode_t mode) +{ +mode_t saved_umask = umask(0777); +FILE *f = Ufopen(filename, options); +(void)umask(saved_umask); +if (f != NULL) (void)fchmod(fileno(f), mode); +return f; +} + + +/************************************************* +* Ensure stdin, stdout, and stderr exist * +*************************************************/ + +/* Some operating systems grumble if an exec() happens without a standard +input, output, and error (fds 0, 1, 2) being defined. The worry is that some +file will be opened and will use these fd values, and then some other bit of +code will assume, for example, that it can write error messages to stderr. +This function ensures that fds 0, 1, and 2 are open if they do not already +exist, by connecting them to /dev/null. + +This function is also used to ensure that std{in,out,err} exist at all times, +so that if any library that Exim calls tries to use them, it doesn't crash. + +Arguments: None +Returns: Nothing +*/ + +void +exim_nullstd(void) +{ +int devnull = -1; +struct stat statbuf; +for (int i = 0; i <= 2; i++) + { + if (fstat(i, &statbuf) < 0 && errno == EBADF) + { + if (devnull < 0) devnull = open("/dev/null", O_RDWR); + if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", + string_open_failed("/dev/null", NULL)); + if (devnull != i) (void)dup2(devnull, i); + } + } +if (devnull > 2) (void)close(devnull); +} + + + + +/************************************************* +* Close unwanted file descriptors for delivery * +*************************************************/ + +/* This function is called from a new process that has been forked to deliver +an incoming message, either directly, or using exec. + +We want any smtp input streams to be closed in this new process. However, it +has been observed that using fclose() here causes trouble. When reading in -bS +input, duplicate copies of messages have been seen. The files will be sharing a +file pointer with the parent process, and it seems that fclose() (at least on +some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at +least sometimes. Hence we go for closing the underlying file descriptors. + +If TLS is active, we want to shut down the TLS library, but without molesting +the parent's SSL connection. + +For delivery of a non-SMTP message, we want to close stdin and stdout (and +stderr unless debugging) because the calling process might have set them up as +pipes and be waiting for them to close before it waits for the submission +process to terminate. If they aren't closed, they hold up the calling process +until the initial delivery process finishes, which is not what we want. + +Exception: We do want it for synchronous delivery! + +And notwithstanding all the above, if D_resolver is set, implying resolver +debugging, leave stdout open, because that's where the resolver writes its +debugging output. + +When we close stderr (which implies we've also closed stdout), we also get rid +of any controlling terminal. + +Arguments: None +Returns: Nothing +*/ + +static void +close_unwanted(void) +{ +if (smtp_input) + { +#ifndef DISABLE_TLS + tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */ +#endif + (void)close(fileno(smtp_in)); + (void)close(fileno(smtp_out)); + smtp_in = NULL; + } +else + { + (void)close(0); /* stdin */ + if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */ + if (debug_selector == 0) /* stderr */ + { + if (!f.synchronous_delivery) + { + (void)close(2); + log_stderr = NULL; + } + (void)setsid(); + } + } +} + + + + +/************************************************* +* Set uid and gid * +*************************************************/ + +/* This function sets a new uid and gid permanently, optionally calling +initgroups() to set auxiliary groups. There are some special cases when running +Exim in unprivileged modes. In these situations the effective uid will not be +root; if we already have the right effective uid/gid, and don't need to +initialize any groups, leave things as they are. + +Arguments: + uid the uid + gid the gid + igflag TRUE if initgroups() wanted + msg text to use in debugging output and failure log + +Returns: nothing; bombs out on failure +*/ + +void +exim_setugid(uid_t uid, gid_t gid, BOOL igflag, const uschar * msg) +{ +uid_t euid = geteuid(); +gid_t egid = getegid(); + +if (euid == root_uid || euid != uid || egid != gid || igflag) + { + /* At least one OS returns +1 for initgroups failure, so just check for + non-zero. */ + + if (igflag) + { + struct passwd *pw = getpwuid(uid); + if (!pw) + log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): " + "no passwd entry for uid=%ld", (long int)uid); + + if (initgroups(pw->pw_name, gid) != 0) + log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s", + (long int)uid, strerror(errno)); + } + + if (setgid(gid) < 0 || setuid(uid) < 0) + log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld " + "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg); + } + +/* Debugging output included uid/gid and all groups */ + +DEBUG(D_uid) + { + int group_count, save_errno; + gid_t group_list[EXIM_GROUPLIST_SIZE]; + debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg, + (long int)geteuid(), (long int)getegid(), (long int)getpid()); + group_count = getgroups(nelem(group_list), group_list); + save_errno = errno; + debug_printf(" auxiliary group list:"); + if (group_count > 0) + for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]); + else if (group_count < 0) + debug_printf(" <error: %s>", strerror(save_errno)); + else debug_printf(" <none>"); + debug_printf("\n"); + } +} + + + + +/************************************************* +* Exit point * +*************************************************/ + +/* Exim exits via this function so that it always clears up any open +databases. + +Arguments: + rc return code + +Returns: does not return +*/ + +void +exim_exit(int rc) +{ +search_tidyup(); +store_exit(); +DEBUG(D_any) + debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d " + ">>>>>>>>>>>>>>>>\n", + (int)getpid(), process_purpose, rc); +exit(rc); +} + + +void +exim_underbar_exit(int rc) +{ +store_exit(); +DEBUG(D_any) + debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d " + ">>>>>>>>>>>>>>>>\n", + (int)getpid(), process_purpose, rc); +_exit(rc); +} + + + +/* Print error string, then die */ +static void +exim_fail(const char * fmt, ...) +{ +va_list ap; +va_start(ap, fmt); +vfprintf(stderr, fmt, ap); +exit(EXIT_FAILURE); +} + +/* fail if a length is too long */ +static inline void +exim_len_fail_toolong(int itemlen, int maxlen, const char *description) +{ +if (itemlen <= maxlen) + return; +fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n", + itemlen, maxlen, description); +exit(EXIT_FAILURE); +} + +/* only pass through the string item back to the caller if it's short enough */ +static inline const uschar * +exim_str_fail_toolong(const uschar *item, int maxlen, const char *description) +{ +exim_len_fail_toolong(Ustrlen(item), maxlen, description); +return item; +} + +/* exim_chown_failure() called from exim_chown()/exim_fchown() on failure +of chown()/fchown(). See src/functions.h for more explanation */ +int +exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group) +{ +int saved_errno = errno; /* from the preceeding chown call */ +#if 1 +log_write(0, LOG_MAIN|LOG_PANIC, + __FILE__ ":%d: chown(%s, %d:%d) failed (%s)." + " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391", + __LINE__, name?name:US"<unknown>", owner, group, strerror(errno)); +#else +/* I leave this here, commented, in case the "bug"(?) comes up again. + It is not an Exim bug, but we can provide a workaround. + See Bug 2391 + HS 2019-04-18 */ + +struct stat buf; + +if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf))) +{ + if (buf.st_uid == owner && buf.st_gid == group) return 0; + log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name); +} +else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno)); + +#endif +errno = saved_errno; +return -1; +} + + +/************************************************* +* Extract port from host address * +*************************************************/ + +/* Called to extract the port from the values given to -oMa and -oMi. +It also checks the syntax of the address, and terminates it before the +port data when a port is extracted. + +Argument: + address the address, with possible port on the end + +Returns: the port, or zero if there isn't one + bombs out on a syntax error +*/ + +static int +check_port(uschar *address) +{ +int port = host_address_extract_port(address); +if (string_is_ip_address(address, NULL) == 0) + exim_fail("exim abandoned: \"%s\" is not an IP address\n", address); +return port; +} + + + +/************************************************* +* Test/verify an address * +*************************************************/ + +/* This function is called by the -bv and -bt code. It extracts a working +address from a full RFC 822 address. This isn't really necessary per se, but it +has the effect of collapsing source routes. + +Arguments: + s the address string + flags flag bits for verify_address() + exit_value to be set for failures + +Returns: nothing +*/ + +static void +test_address(uschar *s, int flags, int *exit_value) +{ +int start, end, domain; +uschar *parse_error = NULL; +uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain, + FALSE); +if (!address) + { + fprintf(stdout, "syntax error: %s\n", parse_error); + *exit_value = 2; + } +else + { + int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1, + -1, -1, NULL, NULL, NULL); + if (rc == FAIL) *exit_value = 2; + else if (rc == DEFER && *exit_value == 0) *exit_value = 1; + } +} + + + +/************************************************* +* Show supported features * +*************************************************/ + +static void +show_string(BOOL is_stdout, gstring * g) +{ +const uschar * s = string_from_gstring(g); +if (s) + if (is_stdout) fputs(CCS s, stdout); + else debug_printf("%s", s); +} + + +static gstring * +show_db_version(gstring * g) +{ +#ifdef DB_VERSION_STRING +DEBUG(D_any) + { + g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING); + g = string_fmt_append(g, " Runtime: %s\n", + db_version(NULL, NULL, NULL)); + } +else + g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING); + +#elif defined(BTREEVERSION) && defined(HASHVERSION) +# ifdef USE_DB + g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n"); +# else + g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n"); +# endif + +#elif defined(_DBM_RDONLY) || defined(dbm_dirfno) +g = string_cat(g, US"Probably ndbm\n"); +#elif defined(USE_TDB) +g = string_cat(g, US"Using tdb\n"); +#else +# ifdef USE_GDBM + g = string_cat(g, US"Probably GDBM (native mode)\n"); +# else + g = string_cat(g, US"Probably GDBM (compatibility mode)\n"); +# endif +#endif +return g; +} + + +/* This function is called for -bV/--version and for -d to output the optional +features of the current Exim binary. + +Arguments: BOOL, true for stdout else debug channel +Returns: nothing +*/ + +static void +show_whats_supported(BOOL is_stdout) +{ +rmark reset_point = store_mark(); +gstring * g = NULL; + +DEBUG(D_any) {} else g = show_db_version(g); + +g = string_cat(g, US"Support for:"); +#ifdef SUPPORT_CRYPTEQ + g = string_cat(g, US" crypteq"); +#endif +#if HAVE_ICONV + g = string_cat(g, US" iconv()"); +#endif +#if HAVE_IPV6 + g = string_cat(g, US" IPv6"); +#endif +#ifdef HAVE_SETCLASSRESOURCES + g = string_cat(g, US" use_setclassresources"); +#endif +#ifdef SUPPORT_PAM + g = string_cat(g, US" PAM"); +#endif +#ifdef EXIM_PERL + g = string_cat(g, US" Perl"); +#endif +#ifdef EXPAND_DLFUNC + g = string_cat(g, US" Expand_dlfunc"); +#endif +#ifdef USE_TCP_WRAPPERS + g = string_cat(g, US" TCPwrappers"); +#endif +#ifdef USE_GNUTLS + g = string_cat(g, US" GnuTLS"); +#endif +#ifdef USE_OPENSSL + g = string_cat(g, US" OpenSSL"); +#endif +#ifndef DISABLE_TLS_RESUME + g = string_cat(g, US" TLS_resume"); +#endif +#ifdef SUPPORT_TRANSLATE_IP_ADDRESS + g = string_cat(g, US" translate_ip_address"); +#endif +#ifdef SUPPORT_MOVE_FROZEN_MESSAGES + g = string_cat(g, US" move_frozen_messages"); +#endif +#ifdef WITH_CONTENT_SCAN + g = string_cat(g, US" Content_Scanning"); +#endif +#ifdef SUPPORT_DANE + g = string_cat(g, US" DANE"); +#endif +#ifndef DISABLE_DKIM + g = string_cat(g, US" DKIM"); +#endif +#ifdef SUPPORT_DMARC + g = string_cat(g, US" DMARC"); +#endif +#ifndef DISABLE_DNSSEC + g = string_cat(g, US" DNSSEC"); +#endif +#ifndef DISABLE_EVENT + g = string_cat(g, US" Event"); +#endif +#ifdef SUPPORT_I18N + g = string_cat(g, US" I18N"); +#endif +#ifndef DISABLE_OCSP + g = string_cat(g, US" OCSP"); +#endif +#ifndef DISABLE_PIPE_CONNECT + g = string_cat(g, US" PIPECONNECT"); +#endif +#ifndef DISABLE_PRDR + g = string_cat(g, US" PRDR"); +#endif +#ifdef SUPPORT_PROXY + g = string_cat(g, US" PROXY"); +#endif +#ifndef DISABLE_QUEUE_RAMP + g = string_cat(g, US" Queue_Ramp"); +#endif +#ifdef SUPPORT_SOCKS + g = string_cat(g, US" SOCKS"); +#endif +#ifdef SUPPORT_SPF + g = string_cat(g, US" SPF"); +#endif +#if defined(SUPPORT_SRS) + g = string_cat(g, US" SRS"); +#endif +#ifdef TCP_FASTOPEN + tcp_init(); + if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open"); +#endif +#ifdef EXPERIMENTAL_ARC + g = string_cat(g, US" Experimental_ARC"); +#endif +#ifdef EXPERIMENTAL_BRIGHTMAIL + g = string_cat(g, US" Experimental_Brightmail"); +#endif +#ifdef EXPERIMENTAL_DCC + g = string_cat(g, US" Experimental_DCC"); +#endif +#ifdef EXPERIMENTAL_DSN_INFO + g = string_cat(g, US" Experimental_DSN_info"); +#endif +#ifdef EXPERIMENTAL_ESMTP_LIMITS + g = string_cat(g, US" Experimental_ESMTP_Limits"); +#endif +#ifdef EXPERIMENTAL_QUEUEFILE + g = string_cat(g, US" Experimental_QUEUEFILE"); +#endif +g = string_cat(g, US"\n"); + +g = string_cat(g, US"Lookups (built-in):"); +#if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2 + g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch"); +#endif +#if defined(LOOKUP_CDB) && LOOKUP_CDB!=2 + g = string_cat(g, US" cdb"); +#endif +#if defined(LOOKUP_DBM) && LOOKUP_DBM!=2 + g = string_cat(g, US" dbm dbmjz dbmnz"); +#endif +#if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2 + g = string_cat(g, US" dnsdb"); +#endif +#if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2 + g = string_cat(g, US" dsearch"); +#endif +#if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2 + g = string_cat(g, US" ibase"); +#endif +#if defined(LOOKUP_JSON) && LOOKUP_JSON!=2 + g = string_cat(g, US" json"); +#endif +#if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2 + g = string_cat(g, US" ldap ldapdn ldapm"); +#endif +#ifdef LOOKUP_LMDB + g = string_cat(g, US" lmdb"); +#endif +#if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2 + g = string_cat(g, US" mysql"); +#endif +#if defined(LOOKUP_NIS) && LOOKUP_NIS!=2 + g = string_cat(g, US" nis nis0"); +#endif +#if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2 + g = string_cat(g, US" nisplus"); +#endif +#if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2 + g = string_cat(g, US" oracle"); +#endif +#if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2 + g = string_cat(g, US" passwd"); +#endif +#if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2 + g = string_cat(g, US" pgsql"); +#endif +#if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2 + g = string_cat(g, US" redis"); +#endif +#if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2 + g = string_cat(g, US" sqlite"); +#endif +#if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2 + g = string_cat(g, US" testdb"); +#endif +#if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2 + g = string_cat(g, US" whoson"); +#endif +g = string_cat(g, US"\n"); + +g = auth_show_supported(g); +g = route_show_supported(g); +g = transport_show_supported(g); + +#ifdef WITH_CONTENT_SCAN +g = malware_show_supported(g); +#endif +show_string(is_stdout, g); g = NULL; + +if (fixed_never_users[0] > 0) + { + int i; + g = string_cat(g, US"Fixed never_users: "); + for (i = 1; i <= (int)fixed_never_users[0] - 1; i++) + string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]); + g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]); + } + +g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid); + +g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t)); + +/* Everything else is details which are only worth reporting when debugging. +Perhaps the tls_version_report should move into this too. */ +DEBUG(D_any) + { + +/* clang defines __GNUC__ (at least, for me) so test for it first */ +#if defined(__clang__) + g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__); +#elif defined(__GNUC__) + g = string_fmt_append(g, "Compiler: GCC [%s]\n", +# ifdef __VERSION__ + __VERSION__ +# else + "? unknown version ?" +# endif + ); +#else + g = string_cat(g, US"Compiler: <unknown>\n"); +#endif + +#if defined(__GLIBC__) && !defined(__UCLIBC__) + g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n", + __GLIBC__, __GLIBC_MINOR__); + if (__GLIBC_PREREQ(2, 1)) + g = string_fmt_append(g, " Runtime: %s\n", + gnu_get_libc_version()); +#endif + +g = show_db_version(g); + +#ifndef DISABLE_TLS + g = tls_version_report(g); +#endif +#ifdef SUPPORT_I18N + g = utf8_version_report(g); +#endif +#ifdef SUPPORT_DMARC + g = dmarc_version_report(g); +#endif +#ifdef SUPPORT_SPF + g = spf_lib_version_report(g); +#endif + +show_string(is_stdout, g); +g = NULL; + +for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi) + if (authi->version_report) + g = (*authi->version_report)(g); + + /* PCRE_PRERELEASE is either defined and empty or a bare sequence of + characters; unless it's an ancient version of PCRE in which case it + is not defined. */ +#ifndef PCRE_PRERELEASE +# define PCRE_PRERELEASE +#endif +#define QUOTE(X) #X +#define EXPAND_AND_QUOTE(X) QUOTE(X) + { + uschar buf[24]; + pcre2_config(PCRE2_CONFIG_VERSION, buf); + g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n" + " Runtime: %s\n", + PCRE2_MAJOR, PCRE2_MINOR, + EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "", + buf); + } +#undef QUOTE +#undef EXPAND_AND_QUOTE + +show_string(is_stdout, g); +g = NULL; + +init_lookup_list(); +for (int i = 0; i < lookup_list_count; i++) + if (lookup_list[i]->version_report) + g = lookup_list[i]->version_report(g); +show_string(is_stdout, g); +g = NULL; + +#ifdef WHITELIST_D_MACROS + g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS); +#else + g = string_cat(g, US"WHITELIST_D_MACROS unset\n"); +#endif +#ifdef TRUSTED_CONFIG_LIST + g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST); +#else + g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n"); +#endif + } + +show_string(is_stdout, g); +store_reset(reset_point); +} + + +/************************************************* +* Show auxiliary information about Exim * +*************************************************/ + +static void +show_exim_information(enum commandline_info request, FILE *stream) +{ +switch(request) + { + case CMDINFO_NONE: + fprintf(stream, "Oops, something went wrong.\n"); + return; + case CMDINFO_HELP: + fprintf(stream, +"The -bI: flag takes a string indicating which information to provide.\n" +"If the string is not recognised, you'll get this help (on stderr).\n" +"\n" +" exim -bI:help this information\n" +" exim -bI:dscp list of known dscp value keywords\n" +" exim -bI:sieve list of supported sieve extensions\n" +); + return; + case CMDINFO_SIEVE: + for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp) + fprintf(stream, "%s\n", *pp); + return; + case CMDINFO_DSCP: + dscp_list_to_stream(stream); + return; + } +} + + +/************************************************* +* Quote a local part * +*************************************************/ + +/* This function is used when a sender address or a From: or Sender: header +line is being created from the caller's login, or from an authenticated_id. It +applies appropriate quoting rules for a local part. + +Argument: the local part +Returns: the local part, quoted if necessary +*/ + +uschar * +local_part_quote(uschar *lpart) +{ +BOOL needs_quote = FALSE; +gstring * g; + +for (uschar * t = lpart; !needs_quote && *t != 0; t++) + { + needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL && + (*t != '.' || t == lpart || t[1] == 0); + } + +if (!needs_quote) return lpart; + +g = string_catn(NULL, US"\"", 1); + +for (;;) + { + uschar *nq = US Ustrpbrk(lpart, "\\\""); + if (nq == NULL) + { + g = string_cat(g, lpart); + break; + } + g = string_catn(g, lpart, nq - lpart); + g = string_catn(g, US"\\", 1); + g = string_catn(g, nq, 1); + lpart = nq + 1; + } + +g = string_catn(g, US"\"", 1); +return string_from_gstring(g); +} + + + +#ifdef USE_READLINE +/************************************************* +* Load readline() functions * +*************************************************/ + +/* This function is called from testing executions that read data from stdin, +but only when running as the calling user. Currently, only -be does this. The +function loads the readline() function library and passes back the functions. +On some systems, it needs the curses library, so load that too, but try without +it if loading fails. All this functionality has to be requested at build time. + +Arguments: + fn_readline_ptr pointer to where to put the readline pointer + fn_addhist_ptr pointer to where to put the addhistory function + +Returns: the dlopen handle or NULL on failure +*/ + +static void * +set_readline(char * (**fn_readline_ptr)(const char *), + void (**fn_addhist_ptr)(const char *)) +{ +void *dlhandle; +void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY); + +dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW); +if (dlhandle_curses) dlclose(dlhandle_curses); + +if (dlhandle) + { + /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are: + * char * readline (const char *prompt); + * void add_history (const char *string); + */ + *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline"); + *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history"); + } +else + DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror()); + +return dlhandle; +} +#endif + + + +/************************************************* +* Get a line from stdin for testing things * +*************************************************/ + +/* This function is called when running tests that can take a number of lines +of input (for example, -be and -bt). It handles continuations and trailing +spaces. And prompting and a blank line output on eof. If readline() is in use, +the arguments are non-NULL and provide the relevant functions. + +Arguments: + fn_readline readline function or NULL + fn_addhist addhist function or NULL + +Returns: pointer to dynamic memory, or NULL at end of file +*/ + +static uschar * +get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *)) +{ +gstring * g = NULL; +BOOL had_input = FALSE; + +if (!fn_readline) { printf("> "); fflush(stdout); } + +for (int i = 0;; i++) + { + uschar buffer[1024]; + uschar * p, * ss; + +#ifdef USE_READLINE + char *readline_line = NULL; + if (fn_readline) + { + if (!(readline_line = fn_readline((i > 0)? "":"> "))) break; + if (*readline_line && fn_addhist) fn_addhist(readline_line); + p = US readline_line; + } + else +#endif + + /* readline() not in use */ + + { + if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/ + p = buffer; + } + + /* Handle the line */ + + had_input = TRUE; + ss = p + Ustrlen(p); + while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */ + + if (i > 0) + while (p < ss && isspace(*p)) p++; /* strip leading space after cont */ + + g = string_catn(g, p, ss - p); + +#ifdef USE_READLINE + if (fn_readline) free(readline_line); +#endif + + /* g can only be NULL if ss==p */ + if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */ + break; + + --g->ptr; /* drop the \ */ + } + +if (had_input) return g ? string_from_gstring(g) : US""; +printf("\n"); +return NULL; +} + + + +/************************************************* +* Output usage information for the program * +*************************************************/ + +/* This function is called when there are no recipients + or a specific --help argument was added. + +Arguments: + progname information on what name we were called by + +Returns: DOES NOT RETURN +*/ + +static void +exim_usage(uschar *progname) +{ + +/* Handle specific program invocation variants */ +if (Ustrcmp(progname, US"-mailq") == 0) + exim_fail( + "mailq - list the contents of the mail queue\n\n" + "For a list of options, see the Exim documentation.\n"); + +/* Generic usage - we output this whatever happens */ +exim_fail( + "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n" + "not directly from a shell command line. Options and/or arguments control\n" + "what it does when called. For a list of options, see the Exim documentation.\n"); +} + + + +/************************************************* +* Validate that the macros given are okay * +*************************************************/ + +/* Typically, Exim will drop privileges if macros are supplied. In some +cases, we want to not do so. + +Arguments: opt_D_used - true if the commandline had a "-D" option +Returns: true if trusted, false otherwise +*/ + +static BOOL +macros_trusted(BOOL opt_D_used) +{ +#ifdef WHITELIST_D_MACROS +uschar *whitelisted, *end, *p, **whites; +int white_count, i, n; +size_t len; +BOOL prev_char_item, found; +#endif + +if (!opt_D_used) + return TRUE; +#ifndef WHITELIST_D_MACROS +return FALSE; +#else + +/* We only trust -D overrides for some invoking users: +root, the exim run-time user, the optional config owner user. +I don't know why config-owner would be needed, but since they can own the +config files anyway, there's no security risk to letting them override -D. */ +if ( ! ((real_uid == root_uid) + || (real_uid == exim_uid) +#ifdef CONFIGURE_OWNER + || (real_uid == config_uid) +#endif + )) + { + debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid); + return FALSE; + } + +/* Get a list of macros which are whitelisted */ +whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE); +prev_char_item = FALSE; +white_count = 0; +for (p = whitelisted; *p != '\0'; ++p) + { + if (*p == ':' || isspace(*p)) + { + *p = '\0'; + if (prev_char_item) + ++white_count; + prev_char_item = FALSE; + continue; + } + if (!prev_char_item) + prev_char_item = TRUE; + } +end = p; +if (prev_char_item) + ++white_count; +if (!white_count) + return FALSE; +whites = store_malloc(sizeof(uschar *) * (white_count+1)); +for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p) + { + if (*p != '\0') + { + whites[i++] = p; + if (i == white_count) + break; + while (*p != '\0' && p < end) + ++p; + } + } +whites[i] = NULL; + +/* The list of commandline macros should be very short. +Accept the N*M complexity. */ +for (macro_item * m = macros_user; m; m = m->next) if (m->command_line) + { + found = FALSE; + for (uschar ** w = whites; *w; ++w) + if (Ustrcmp(*w, m->name) == 0) + { + found = TRUE; + break; + } + if (!found) + return FALSE; + if (!m->replacement) + continue; + if ((len = m->replen) == 0) + continue; + if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL)) + return FALSE; + } +DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n"); +return TRUE; +#endif +} + + +/************************************************* +* Expansion testing * +*************************************************/ + +/* Expand and print one item, doing macro-processing. + +Arguments: + item line for expansion +*/ + +static void +expansion_test_line(const uschar * line) +{ +int len; +BOOL dummy_macexp; +uschar * s; + +Ustrncpy(big_buffer, line, big_buffer_size); +big_buffer[big_buffer_size-1] = '\0'; +len = Ustrlen(big_buffer); + +(void) macros_expand(0, &len, &dummy_macexp); + +if (isupper(big_buffer[0])) + { + if (macro_read_assignment(big_buffer)) + printf("Defined macro '%s'\n", mlast->name); + } +else + if ((s = expand_string(big_buffer))) printf("%s\n", CS s); + else printf("Failed: %s\n", expand_string_message); +} + + + +/************************************************* +* Entry point and high-level code * +*************************************************/ + +/* Entry point for the Exim mailer. Analyse the arguments and arrange to take +the appropriate action. All the necessary functions are present in the one +binary. I originally thought one should split it up, but it turns out that so +much of the apparatus is needed in each chunk that one might as well just have +it all available all the time, which then makes the coding easier as well. + +Arguments: + argc count of entries in argv + argv argument strings, with argv[0] being the program name + +Returns: EXIT_SUCCESS if terminated successfully + EXIT_FAILURE otherwise, except when a message has been sent + to the sender, and -oee was given +*/ + +int +main(int argc, char **cargv) +{ +uschar **argv = USS cargv; +int arg_receive_timeout = -1; +int arg_smtp_receive_timeout = -1; +int arg_error_handling = error_handling; +int filter_sfd = -1; +int filter_ufd = -1; +int group_count; +int i, rv; +int list_queue_option = 0; +int msg_action = 0; +int msg_action_arg = -1; +int namelen = argv[0] ? Ustrlen(argv[0]) : 0; +int queue_only_reason = 0; +#ifdef EXIM_PERL +int perl_start_option = 0; +#endif +int recipients_arg = argc; +int sender_address_domain = 0; +int test_retry_arg = -1; +int test_rewrite_arg = -1; +gid_t original_egid; +BOOL arg_queue_only = FALSE; +BOOL bi_option = FALSE; +BOOL checking = FALSE; +BOOL count_queue = FALSE; +BOOL expansion_test = FALSE; +BOOL extract_recipients = FALSE; +BOOL flag_G = FALSE; +BOOL flag_n = FALSE; +BOOL forced_delivery = FALSE; +BOOL f_end_dot = FALSE; +BOOL deliver_give_up = FALSE; +BOOL list_queue = FALSE; +BOOL list_options = FALSE; +BOOL list_config = FALSE; +BOOL local_queue_only; +BOOL one_msg_action = FALSE; +BOOL opt_D_used = FALSE; +BOOL queue_only_set = FALSE; +BOOL receiving_message = TRUE; +BOOL sender_ident_set = FALSE; +BOOL session_local_queue_only; +BOOL unprivileged; +BOOL removed_privilege = FALSE; +BOOL usage_wanted = FALSE; +BOOL verify_address_mode = FALSE; +BOOL verify_as_sender = FALSE; +BOOL rcpt_verify_quota = FALSE; +BOOL version_printed = FALSE; +uschar *alias_arg = NULL; +uschar *called_as = US""; +uschar *cmdline_syslog_name = NULL; +uschar *start_queue_run_id = NULL; +uschar *stop_queue_run_id = NULL; +uschar *expansion_test_message = NULL; +const uschar *ftest_domain = NULL; +const uschar *ftest_localpart = NULL; +const uschar *ftest_prefix = NULL; +const uschar *ftest_suffix = NULL; +uschar *log_oneline = NULL; +uschar *malware_test_file = NULL; +uschar *real_sender_address; +uschar *originator_home = US"/"; +size_t sz; + +struct passwd *pw; +struct stat statbuf; +pid_t passed_qr_pid = (pid_t)0; +int passed_qr_pipe = -1; +gid_t group_list[EXIM_GROUPLIST_SIZE]; + +/* For the -bI: flag */ +enum commandline_info info_flag = CMDINFO_NONE; +BOOL info_stdout = FALSE; + +/* Possible options for -R and -S */ + +static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" }; + +/* Need to define this in case we need to change the environment in order +to get rid of a bogus time zone. We have to make it char rather than uschar +because some OS define it in /usr/include/unistd.h. */ + +extern char **environ; + +#ifdef MEASURE_TIMING +(void)gettimeofday(×tamp_startup, NULL); +#endif + +store_init(); /* Initialise the memory allocation susbsystem */ +pcre_init(); /* Set up memory handling for pcre */ + +/* If the Exim user and/or group and/or the configuration file owner/group were +defined by ref:name at build time, we must now find the actual uid/gid values. +This is a feature to make the lives of binary distributors easier. */ + +#ifdef EXIM_USERNAME +if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid)) + { + if (exim_uid == 0) + exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME); + + /* If ref:name uses a number as the name, route_finduser() returns + TRUE with exim_uid set and pw coerced to NULL. */ + if (pw) + exim_gid = pw->pw_gid; +#ifndef EXIM_GROUPNAME + else + exim_fail( + "exim: ref:name should specify a usercode, not a group.\n" + "exim: can't let you get away with it unless you also specify a group.\n"); +#endif + } +else + exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME); +#endif + +#ifdef EXIM_GROUPNAME +if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid)) + exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME); +#endif + +#ifdef CONFIGURE_OWNERNAME +if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid)) + exim_fail("exim: failed to find uid for user name \"%s\"\n", + CONFIGURE_OWNERNAME); +#endif + +/* We default the system_filter_user to be the Exim run-time user, as a +sane non-root value. */ +system_filter_uid = exim_uid; + +#ifdef CONFIGURE_GROUPNAME +if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid)) + exim_fail("exim: failed to find gid for group name \"%s\"\n", + CONFIGURE_GROUPNAME); +#endif + +/* In the Cygwin environment, some initialization used to need doing. +It was fudged in by means of this macro; now no longer but we'll leave +it in case of others. */ + +#ifdef OS_INIT +OS_INIT +#endif + +/* Check a field which is patched when we are running Exim within its +testing harness; do a fast initial check, and then the whole thing. */ + +f.running_in_test_harness = + *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0; +if (f.running_in_test_harness) + debug_store = TRUE; + +/* Protect against abusive argv[0] */ +if (!argv[0] || !argc) exim_fail("exim: executable name required\n"); +exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]"); + +/* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed +at the start of a program; however, it seems that some environments do not +follow this. A "strange" locale can affect the formatting of timestamps, so we +make quite sure. */ + +setlocale(LC_ALL, "C"); + +/* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */ + +#ifdef _POSIX_MONOTONIC_CLOCK +exim_clock_init(); +#endif + +/* Set up the default handler for timing using alarm(). */ + +os_non_restarting_signal(SIGALRM, sigalrm_handler); + +/* Ensure we have a buffer for constructing log entries. Use malloc directly, +because store_malloc writes a log entry on failure. */ + +if (!(log_buffer = US malloc(LOG_BUFFER_SIZE))) + exim_fail("exim: failed to get store for log buffer\n"); + +/* Initialize the default log options. */ + +bits_set(log_selector, log_selector_size, log_default); + +/* Set log_stderr to stderr, provided that stderr exists. This gets reset to +NULL when the daemon is run and the file is closed. We have to use this +indirection, because some systems don't allow writing to the variable "stderr". +*/ + +if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr; + +/* Ensure there is a big buffer for temporary use in several places. It is put +in malloc store so that it can be freed for enlargement if necessary. */ + +big_buffer = store_malloc(big_buffer_size); + +/* Set up the handler for the data request signal, and set the initial +descriptive text. */ + +process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED); +set_process_info("initializing"); +os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */ +#ifdef SA_SIGINFO + { + struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO }; + sigaction(SIGSEGV, &act, NULL); + } +#else +signal(SIGSEGV, segv_handler); /* log faults */ +#endif + +/* If running in a dockerized environment, the TERM signal is only +delegated to the PID 1 if we request it by setting an signal handler */ +if (getpid() == 1) signal(SIGTERM, term_handler); + +/* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate +in the daemon code. For the rest of Exim's uses, we ignore it. */ + +signal(SIGHUP, SIG_IGN); + +/* We don't want to die on pipe errors as the code is written to handle +the write error instead. */ + +signal(SIGPIPE, SIG_IGN); + +/* Under some circumstance on some OS, Exim can get called with SIGCHLD +set to SIG_IGN. This causes subprocesses that complete before the parent +process waits for them not to hang around, so when Exim calls wait(), nothing +is there. The wait() code has been made robust against this, but let's ensure +that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process +ending status. We use sigaction rather than plain signal() on those OS where +SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a +problem on AIX with this.) */ + +#ifdef SA_NOCLDWAIT + { + struct sigaction act; + act.sa_handler = SIG_DFL; + sigemptyset(&(act.sa_mask)); + act.sa_flags = 0; + sigaction(SIGCHLD, &act, NULL); + } +#else +signal(SIGCHLD, SIG_DFL); +#endif + +/* Save the arguments for use if we re-exec exim as a daemon after receiving +SIGHUP. */ + +sighup_argv = argv; + +/* Set up the version number. Set up the leading 'E' for the external form of +message ids, set the pointer to the internal form, and initialize it to +indicate no message being processed. */ + +version_init(); +message_id_option[0] = '-'; +message_id_external = message_id_option + 1; +message_id_external[0] = 'E'; +message_id = message_id_external + 1; +message_id[0] = 0; + +/* Set the umask to zero so that any files Exim creates using open() are +created with the modes that it specifies. NOTE: Files created with fopen() have +a problem, which was not recognized till rather late (February 2006). With this +umask, such files will be world writeable. (They are all content scanning files +in the spool directory, which isn't world-accessible, so this is not a +disaster, but it's untidy.) I don't want to change this overall setting, +however, because it will interact badly with the open() calls. Instead, there's +now a function called modefopen() that fiddles with the umask while calling +fopen(). */ + +(void)umask(0); + +/* Precompile the regular expression for matching a message id. Keep this in +step with the code that generates ids in the accept.c module. We need to do +this here, because the -M options check their arguments for syntactic validity +using mac_ismsgid, which uses this. */ + +regex_ismsgid = + regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE); + +/* Precompile the regular expression that is used for matching an SMTP error +code, possibly extended, at the start of an error message. Note that the +terminating whitespace character is included. */ + +regex_smtp_code = + regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?", + FALSE, TRUE); + +#ifdef WHITELIST_D_MACROS +/* Precompile the regular expression used to filter the content of macros +given to -D for permissibility. */ + +regex_whitelisted_macro = + regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE); +#endif + +for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL; + +/* If the program is called as "mailq" treat it as equivalent to "exim -bp"; +this seems to be a generally accepted convention, since one finds symbolic +links called "mailq" in standard OS configurations. */ + +if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) || + (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0)) + { + list_queue = TRUE; + receiving_message = FALSE; + called_as = US"-mailq"; + } + +/* If the program is called as "rmail" treat it as equivalent to +"exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode, +i.e. preventing a single dot on a line from terminating the message, and +returning with zero return code, even in cases of error (provided an error +message has been sent). */ + +if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) || + (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0)) + { + f.dot_ends = FALSE; + called_as = US"-rmail"; + errors_sender_rc = EXIT_SUCCESS; + } + +/* If the program is called as "rsmtp" treat it as equivalent to "exim -bS"; +this is a smail convention. */ + +if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) || + (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0)) + { + smtp_input = smtp_batched_input = TRUE; + called_as = US"-rsmtp"; + } + +/* If the program is called as "runq" treat it as equivalent to "exim -q"; +this is a smail convention. */ + +if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) || + (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0)) + { + queue_interval = 0; + receiving_message = FALSE; + called_as = US"-runq"; + } + +/* If the program is called as "newaliases" treat it as equivalent to +"exim -bi"; this is a sendmail convention. */ + +if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) || + (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0)) + { + bi_option = TRUE; + receiving_message = FALSE; + called_as = US"-newaliases"; + } + +/* Save the original effective uid for a couple of uses later. It should +normally be root, but in some esoteric environments it may not be. */ + +original_euid = geteuid(); +original_egid = getegid(); + +/* Get the real uid and gid. If the caller is root, force the effective uid/gid +to be the same as the real ones. This makes a difference only if Exim is setuid +(or setgid) to something other than root, which could be the case in some +special configurations. */ + +real_uid = getuid(); +real_gid = getgid(); + +if (real_uid == root_uid) + { + if ((rv = setgid(real_gid))) + exim_fail("exim: setgid(%ld) failed: %s\n", + (long int)real_gid, strerror(errno)); + if ((rv = setuid(real_uid))) + exim_fail("exim: setuid(%ld) failed: %s\n", + (long int)real_uid, strerror(errno)); + } + +/* If neither the original real uid nor the original euid was root, Exim is +running in an unprivileged state. */ + +unprivileged = (real_uid != root_uid && original_euid != root_uid); + +/* For most of the args-parsing we need to use permanent pool memory */ + { + int old_pool = store_pool; + store_pool = POOL_PERM; + +/* Scan the program's arguments. Some can be dealt with right away; others are +simply recorded for checking and handling afterwards. Do a high-level switch +on the second character (the one after '-'), to save some effort. */ + + for (i = 1; i < argc; i++) + { + BOOL badarg = FALSE; + uschar * arg = argv[i]; + uschar * argrest; + int switchchar; + + /* An argument not starting with '-' is the start of a recipients list; + break out of the options-scanning loop. */ + + if (arg[0] != '-') + { + recipients_arg = i; + break; + } + + /* An option consisting of -- terminates the options */ + + if (Ustrcmp(arg, "--") == 0) + { + recipients_arg = i + 1; + break; + } + + /* Handle flagged options */ + + switchchar = arg[1]; + argrest = arg+2; + + /* Make all -ex options synonymous with -oex arguments, since that + is assumed by various callers. Also make -qR options synonymous with -R + options, as that seems to be required as well. Allow for -qqR too, and + the same for -S options. */ + + if (Ustrncmp(arg+1, "oe", 2) == 0 || + Ustrncmp(arg+1, "qR", 2) == 0 || + Ustrncmp(arg+1, "qS", 2) == 0) + { + switchchar = arg[2]; + argrest++; + } + else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0) + { + switchchar = arg[3]; + argrest += 2; + f.queue_2stage = TRUE; + } + + /* Make -r synonymous with -f, since it is a documented alias */ + + else if (arg[1] == 'r') switchchar = 'f'; + + /* Make -ov synonymous with -v */ + + else if (Ustrcmp(arg, "-ov") == 0) + { + switchchar = 'v'; + argrest++; + } + + /* deal with --option_aliases */ + else if (switchchar == '-') + { + if (Ustrcmp(argrest, "help") == 0) + { + usage_wanted = TRUE; + break; + } + else if (Ustrcmp(argrest, "version") == 0) + { + switchchar = 'b'; + argrest = US"V"; + } + } + + /* High-level switch on active initial letter */ + + switch(switchchar) + { + + /* sendmail uses -Ac and -Am to control which .cf file is used; + we ignore them. */ + case 'A': + if (!*argrest) { badarg = TRUE; break; } + else + { + BOOL ignore = FALSE; + switch (*argrest) + { + case 'c': + case 'm': + if (*(argrest + 1) == '\0') + ignore = TRUE; + break; + } + if (!ignore) badarg = TRUE; + } + break; + + /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean + so has no need of it. */ + + case 'B': + if (!*argrest) i++; /* Skip over the type */ + break; + + + case 'b': + { + receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */ + + switch (*argrest++) + { + /* -bd: Run in daemon mode, awaiting SMTP connections. + -bdf: Ditto, but in the foreground. + */ + case 'd': + f.daemon_listen = TRUE; + if (*argrest == 'f') f.background_daemon = FALSE; + else if (*argrest) badarg = TRUE; + break; + + /* -be: Run in expansion test mode + -bem: Ditto, but read a message from a file first + */ + case 'e': + expansion_test = checking = TRUE; + if (*argrest == 'm') + { + if (++i >= argc) { badarg = TRUE; break; } + expansion_test_message = argv[i]; + argrest++; + } + if (*argrest) badarg = TRUE; + break; + + /* -bF: Run system filter test */ + case 'F': + filter_test |= checking = FTEST_SYSTEM; + if (*argrest) badarg = TRUE; + else if (++i < argc) filter_test_sfile = argv[i]; + else exim_fail("exim: file name expected after %s\n", argv[i-1]); + break; + + /* -bf: Run user filter test + -bfd: Set domain for filter testing + -bfl: Set local part for filter testing + -bfp: Set prefix for filter testing + -bfs: Set suffix for filter testing + */ + case 'f': + if (!*argrest) + { + filter_test |= checking = FTEST_USER; + if (++i < argc) filter_test_ufile = argv[i]; + else exim_fail("exim: file name expected after %s\n", argv[i-1]); + } + else + { + if (++i >= argc) + exim_fail("exim: string expected after %s\n", arg); + if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd"); + else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl"); + else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp"); + else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs"); + else badarg = TRUE; + } + break; + + /* -bh: Host checking - an IP address must follow. */ + case 'h': + if (!*argrest || Ustrcmp(argrest, "c") == 0) + { + if (++i >= argc) { badarg = TRUE; break; } + sender_host_address = string_copy_taint( + exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"), + GET_TAINTED); + host_checking = checking = f.log_testing_mode = TRUE; + f.host_checking_callout = *argrest == 'c'; + message_logs = FALSE; + } + else badarg = TRUE; + break; + + /* -bi: This option is used by sendmail to initialize *the* alias file, + though it has the -oA option to specify a different file. Exim has no + concept of *the* alias file, but since Sun's YP make script calls + sendmail this way, some support must be provided. */ + case 'i': + if (!*argrest) bi_option = TRUE; + else badarg = TRUE; + break; + + /* -bI: provide information, of the type to follow after a colon. + This is an Exim flag. */ + case 'I': + if (Ustrlen(argrest) >= 1 && *argrest == ':') + { + uschar *p = argrest+1; + info_flag = CMDINFO_HELP; + if (Ustrlen(p)) + if (strcmpic(p, CUS"sieve") == 0) + { + info_flag = CMDINFO_SIEVE; + info_stdout = TRUE; + } + else if (strcmpic(p, CUS"dscp") == 0) + { + info_flag = CMDINFO_DSCP; + info_stdout = TRUE; + } + else if (strcmpic(p, CUS"help") == 0) + info_stdout = TRUE; + } + else badarg = TRUE; + break; + + /* -bm: Accept and deliver message - the default option. Reinstate + receiving_message, which got turned off for all -b options. + -bmalware: test the filename given for malware */ + case 'm': + if (!*argrest) receiving_message = TRUE; + else if (Ustrcmp(argrest, "alware") == 0) + { + if (++i >= argc) { badarg = TRUE; break; } + checking = TRUE; + malware_test_file = argv[i]; + } + else badarg = TRUE; + break; + + /* -bnq: For locally originating messages, do not qualify unqualified + addresses. In the envelope, this causes errors; in header lines they + just get left. */ + case 'n': + if (Ustrcmp(argrest, "q") == 0) + { + f.allow_unqualified_sender = FALSE; + f.allow_unqualified_recipient = FALSE; + } + else badarg = TRUE; + break; + + /* -bpxx: List the contents of the mail queue, in various forms. If + the option is -bpc, just a queue count is needed. Otherwise, if the + first letter after p is r, then order is random. */ + case 'p': + if (*argrest == 'c') + { + count_queue = TRUE; + if (*++argrest) badarg = TRUE; + break; + } + + if (*argrest == 'r') + { + list_queue_option = 8; + argrest++; + } + else list_queue_option = 0; + + list_queue = TRUE; + + /* -bp: List the contents of the mail queue, top-level only */ + + if (!*argrest) {} + + /* -bpu: List the contents of the mail queue, top-level undelivered */ + + else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1; + + /* -bpa: List the contents of the mail queue, including all delivered */ + + else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2; + + /* Unknown after -bp[r] */ + + else badarg = TRUE; + break; + + + /* -bP: List the configuration variables given as the address list. + Force -v, so configuration errors get displayed. */ + case 'P': + + /* -bP config: we need to setup here, because later, + when list_options is checked, the config is read already */ + if (*argrest) + badarg = TRUE; + else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0) + { + list_config = TRUE; + readconf_save_config(version_string); + } + else + { + list_options = TRUE; + debug_selector |= D_v; + debug_file = stderr; + } + break; + + /* -brt: Test retry configuration lookup */ + case 'r': + if (Ustrcmp(argrest, "t") == 0) + { + checking = TRUE; + test_retry_arg = i + 1; + goto END_ARG; + } + + /* -brw: Test rewrite configuration */ + + else if (Ustrcmp(argrest, "w") == 0) + { + checking = TRUE; + test_rewrite_arg = i + 1; + goto END_ARG; + } + else badarg = TRUE; + break; + + /* -bS: Read SMTP commands on standard input, but produce no replies - + all errors are reported by sending messages. */ + case 'S': + if (!*argrest) + smtp_input = smtp_batched_input = receiving_message = TRUE; + else badarg = TRUE; + break; + + /* -bs: Read SMTP commands on standard input and produce SMTP replies + on standard output. */ + case 's': + if (!*argrest) smtp_input = receiving_message = TRUE; + else badarg = TRUE; + break; + + /* -bt: address testing mode */ + case 't': + if (!*argrest) + f.address_test_mode = checking = f.log_testing_mode = TRUE; + else badarg = TRUE; + break; + + /* -bv: verify addresses */ + case 'v': + if (!*argrest) + verify_address_mode = checking = f.log_testing_mode = TRUE; + + /* -bvs: verify sender addresses */ + + else if (Ustrcmp(argrest, "s") == 0) + { + verify_address_mode = checking = f.log_testing_mode = TRUE; + verify_as_sender = TRUE; + } + else badarg = TRUE; + break; + + /* -bV: Print version string and support details */ + case 'V': + if (!*argrest) + { + printf("Exim version %s #%s built %s\n", version_string, + version_cnumber, version_date); + printf("%s\n", CS version_copyright); + version_printed = TRUE; + show_whats_supported(TRUE); + f.log_testing_mode = TRUE; + } + else badarg = TRUE; + break; + + /* -bw: inetd wait mode, accept a listening socket as stdin */ + case 'w': + f.inetd_wait_mode = TRUE; + f.background_daemon = FALSE; + f.daemon_listen = TRUE; + if (*argrest) + if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0) + exim_fail("exim: bad time value %s: abandoned\n", argv[i]); + break; + + default: + badarg = TRUE; + break; + } + break; + } + + + /* -C: change configuration file list; ignore if it isn't really + a change! Enforce a prefix check if required. */ + + case 'C': + if (!*argrest) + if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; } + if (Ustrcmp(config_main_filelist, argrest) != 0) + { + #ifdef ALT_CONFIG_PREFIX + int sep = 0; + int len = Ustrlen(ALT_CONFIG_PREFIX); + const uschar *list = argrest; + uschar *filename; + /* The argv is untainted, so big_buffer (also untainted) is ok to use */ + while((filename = string_nextinlist(&list, &sep, big_buffer, + big_buffer_size))) + if ( ( Ustrlen(filename) < len + || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 + || Ustrstr(filename, "/../") != NULL + ) + && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid) + ) + exim_fail("-C Permission denied\n"); + #endif + if (real_uid != root_uid) + { + #ifdef TRUSTED_CONFIG_LIST + + if (real_uid != exim_uid + #ifdef CONFIGURE_OWNER + && real_uid != config_uid + #endif + ) + f.trusted_config = FALSE; + else + { + FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb"); + if (trust_list) + { + struct stat statbuf; + + if (fstat(fileno(trust_list), &statbuf) != 0 || + (statbuf.st_uid != root_uid /* owner not root */ + #ifdef CONFIGURE_OWNER + && statbuf.st_uid != config_uid /* owner not the special one */ + #endif + ) || /* or */ + (statbuf.st_gid != root_gid /* group not root */ + #ifdef CONFIGURE_GROUP + && statbuf.st_gid != config_gid /* group not the special one */ + #endif + && (statbuf.st_mode & 020) != 0 /* group writeable */ + ) || /* or */ + (statbuf.st_mode & 2) != 0) /* world writeable */ + { + f.trusted_config = FALSE; + fclose(trust_list); + } + else + { + /* Well, the trust list at least is up to scratch... */ + rmark reset_point; + uschar *trusted_configs[32]; + int nr_configs = 0; + int i = 0; + int old_pool = store_pool; + store_pool = POOL_MAIN; + + reset_point = store_mark(); + while (Ufgets(big_buffer, big_buffer_size, trust_list)) + { + uschar *start = big_buffer, *nl; + while (*start && isspace(*start)) + start++; + if (*start != '/') + continue; + nl = Ustrchr(start, '\n'); + if (nl) + *nl = 0; + trusted_configs[nr_configs++] = string_copy(start); + if (nr_configs == nelem(trusted_configs)) + break; + } + fclose(trust_list); + + if (nr_configs) + { + int sep = 0; + const uschar *list = argrest; + uschar *filename; + while (f.trusted_config && (filename = string_nextinlist(&list, + &sep, big_buffer, big_buffer_size))) + { + for (i=0; i < nr_configs; i++) + if (Ustrcmp(filename, trusted_configs[i]) == 0) + break; + if (i == nr_configs) + { + f.trusted_config = FALSE; + break; + } + } + } + else /* No valid prefixes found in trust_list file. */ + f.trusted_config = FALSE; + store_reset(reset_point); + store_pool = old_pool; + } + } + else /* Could not open trust_list file. */ + f.trusted_config = FALSE; + } + #else + /* Not root; don't trust config */ + f.trusted_config = FALSE; + #endif + } + + config_main_filelist = argrest; + f.config_changed = TRUE; + } + break; + + + /* -D: set up a macro definition */ + + case 'D': +#ifdef DISABLE_D_OPTION + exim_fail("exim: -D is not available in this Exim binary\n"); +#else + { + int ptr = 0; + macro_item *m; + uschar name[24]; + uschar *s = argrest; + + opt_D_used = TRUE; + while (isspace(*s)) s++; + + if (*s < 'A' || *s > 'Z') + exim_fail("exim: macro name set by -D must start with " + "an upper case letter\n"); + + while (isalnum(*s) || *s == '_') + { + if (ptr < sizeof(name)-1) name[ptr++] = *s; + s++; + } + name[ptr] = 0; + if (ptr == 0) { badarg = TRUE; break; } + while (isspace(*s)) s++; + if (*s != 0) + { + if (*s++ != '=') { badarg = TRUE; break; } + while (isspace(*s)) s++; + } + + for (m = macros_user; m; m = m->next) + if (Ustrcmp(m->name, name) == 0) + exim_fail("exim: duplicated -D in command line\n"); + + m = macro_create(name, s, TRUE); + + if (clmacro_count >= MAX_CLMACROS) + exim_fail("exim: too many -D options on command line\n"); + clmacros[clmacro_count++] = + string_sprintf("-D%s=%s", m->name, m->replacement); + } + #endif + break; + + case 'd': + + /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */ + + if (Ustrcmp(argrest, "ropcr") == 0) + { + /* drop_cr = TRUE; */ + } + + /* -dp: Set up a debug pretrigger buffer with given size. */ + + else if (Ustrcmp(argrest, "p") == 0) + if (++i >= argc) + badarg = TRUE; + else + debug_pretrigger_setup(argv[i]); + + /* -dt: Set a debug trigger selector */ + + else if (Ustrncmp(argrest, "t=", 2) == 0) + dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0); + + /* -d: Set debug level (see also -v below). + If -dd is used, debugging subprocesses of the daemon is disabled. */ + + else + { + /* Use an intermediate variable so that we don't set debugging while + decoding the debugging bits. */ + + unsigned int selector = D_default; + debug_selector = 0; + debug_file = NULL; + if (*argrest == 'd') + { + f.debug_daemon = TRUE; + argrest++; + } + if (*argrest) + decode_bits(&selector, 1, debug_notall, argrest, + debug_options, debug_options_count, US"debug", 0); + debug_selector = selector; + } + break; + + + /* -E: This is a local error message. This option is not intended for + external use at all, but is not restricted to trusted callers because it + does no harm (just suppresses certain error messages) and if Exim is run + not setuid root it won't always be trusted when it generates error + messages using this option. If there is a message id following -E, point + message_reference at it, for logging. */ + + case 'E': + f.local_error_message = TRUE; + if (mac_ismsgid(argrest)) message_reference = argrest; + break; + + + /* -ex: The vacation program calls sendmail with the undocumented "-eq" + option, so it looks as if historically the -oex options are also callable + without the leading -o. So we have to accept them. Before the switch, + anything starting -oe has been converted to -e. Exim does not support all + of the sendmail error options. */ + + case 'e': + if (Ustrcmp(argrest, "e") == 0) + { + arg_error_handling = ERRORS_SENDER; + errors_sender_rc = EXIT_SUCCESS; + } + else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER; + else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR; + else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR; + else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER; + else badarg = TRUE; + break; + + + /* -F: Set sender's full name, used instead of the gecos entry from + the password file. Since users can usually alter their gecos entries, + there's no security involved in using this instead. The data can follow + the -F or be in the next argument. */ + + case 'F': + if (!*argrest) + if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; } + originator_name = string_copy_taint( + exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"), + GET_TAINTED); + f.sender_name_forced = TRUE; + break; + + + /* -f: Set sender's address - this value is only actually used if Exim is + run by a trusted user, or if untrusted_set_sender is set and matches the + address, except that the null address can always be set by any user. The + test for this happens later, when the value given here is ignored when not + permitted. For an untrusted user, the actual sender is still put in Sender: + if it doesn't match the From: header (unless no_local_from_check is set). + The data can follow the -f or be in the next argument. The -r switch is an + obsolete form of -f but since there appear to be programs out there that + use anything that sendmail has ever supported, better accept it - the + synonymizing is done before the switch above. + + At this stage, we must allow domain literal addresses, because we don't + know what the setting of allow_domain_literals is yet. Ditto for trailing + dots and strip_trailing_dot. */ + + case 'f': + { + int dummy_start, dummy_end; + uschar *errmess; + if (!*argrest) + if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; } + (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f"); + if (!*argrest) + *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */ + else + { + uschar * temp = argrest + Ustrlen(argrest) - 1; + while (temp >= argrest && isspace(*temp)) temp--; + if (temp >= argrest && *temp == '.') f_end_dot = TRUE; + allow_domain_literals = TRUE; + strip_trailing_dot = TRUE; +#ifdef SUPPORT_I18N + allow_utf8_domains = TRUE; +#endif + if (!(sender_address = parse_extract_address(argrest, &errmess, + &dummy_start, &dummy_end, &sender_address_domain, TRUE))) + exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess); + + sender_address = string_copy_taint(sender_address, GET_TAINTED); +#ifdef SUPPORT_I18N + message_smtputf8 = string_is_utf8(sender_address); + allow_utf8_domains = FALSE; +#endif + allow_domain_literals = FALSE; + strip_trailing_dot = FALSE; + } + f.sender_address_forced = TRUE; + } + break; + + /* -G: sendmail invocation to specify that it's a gateway submission and + sendmail may complain about problems instead of fixing them. + We make it equivalent to an ACL "control = suppress_local_fixups" and do + not at this time complain about problems. */ + + case 'G': + flag_G = TRUE; + break; + + /* -h: Set the hop count for an incoming message. Exim does not currently + support this; it always computes it by counting the Received: headers. + To put it in will require a change to the spool header file format. */ + + case 'h': + if (!*argrest) + if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; } + if (!isdigit(*argrest)) badarg = TRUE; + break; + + + /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems + not to be documented for sendmail but mailx (at least) uses it) */ + + case 'i': + if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE; + break; + + + /* -L: set the identifier used for syslog; equivalent to setting + syslog_processname in the config file, but needs to be an admin option. */ + + case 'L': + if (!*argrest) + if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; } + if ((sz = Ustrlen(argrest)) > 32) + exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest); + if (sz < 1) + exim_fail("exim: the -L syslog name is too short\n"); + cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED); + break; + + case 'M': + receiving_message = FALSE; + + /* -MC: continue delivery of another message via an existing open + file descriptor. This option is used for an internal call by the + smtp transport when there is a pending message waiting to go to an + address to which it has got a connection. Five subsequent arguments are + required: transport name, host name, IP address, sequence number, and + message_id. Transports may decline to create new processes if the sequence + number gets too big. The channel is stdin. This (-MC) must be the last + argument. There's a subsequent check that the real-uid is privileged. + + If we are running in the test harness. delay for a bit, to let the process + that set this one up complete. This makes for repeatability of the logging, + etc. output. */ + + if (Ustrcmp(argrest, "C") == 0) + { + union sockaddr_46 interface_sock; + EXIM_SOCKLEN_T size = sizeof(interface_sock); + + if (argc != i + 6) + exim_fail("exim: too many or too few arguments after -MC\n"); + + if (msg_action_arg >= 0) + exim_fail("exim: incompatible arguments\n"); + + continue_transport = string_copy_taint( + exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"), + GET_TAINTED); + continue_hostname = string_copy_taint( + exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"), + GET_TAINTED); + continue_host_address = string_copy_taint( + exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"), + GET_TAINTED); + continue_sequence = Uatoi(argv[++i]); + msg_action = MSG_DELIVER; + msg_action_arg = ++i; + forced_delivery = TRUE; + queue_run_pid = passed_qr_pid; + queue_run_pipe = passed_qr_pipe; + + if (!mac_ismsgid(argv[i])) + exim_fail("exim: malformed message id %s after -MC option\n", + argv[i]); + + /* Set up $sending_ip_address and $sending_port, unless proxied */ + + if (!continue_proxy_cipher) + if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock), + &size) == 0) + sending_ip_address = host_ntoa(-1, &interface_sock, NULL, + &sending_port); + else + exim_fail("exim: getsockname() failed after -MC option: %s\n", + strerror(errno)); + + testharness_pause_ms(500); + break; + } + + else if (*argrest == 'C' && argrest[1] && !argrest[2]) + { + switch(argrest[1]) + { + /* -MCA: set the smtp_authenticated flag; this is useful only when it + precedes -MC (see above). The flag indicates that the host to which + Exim is connected has accepted an AUTH sequence. */ + + case 'A': f.smtp_authenticated = TRUE; break; + + /* -MCD: set the smtp_use_dsn flag; this indicates that the host + that exim is connected to supports the esmtp extension DSN */ + + case 'D': smtp_peer_options |= OPTION_DSN; break; + + /* -MCd: for debug, set a process-purpose string */ + + case 'd': if (++i < argc) + process_purpose = string_copy_taint( + exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"), + GET_TAINTED); + else badarg = TRUE; + break; + + /* -MCG: set the queue name, to a non-default value. Arguably, anything + from the commandline should be tainted - but we will need an untainted + value for the spoolfile when doing a -odi delivery process. */ + + case 'G': if (++i < argc) queue_name = string_copy_taint( + exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"), + GET_UNTAINTED); + else badarg = TRUE; + break; + + /* -MCK: the peer offered CHUNKING. Must precede -MC */ + + case 'K': smtp_peer_options |= OPTION_CHUNKING; break; + +#ifdef EXPERIMENTAL_ESMTP_LIMITS + /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */ + case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]); + else badarg = TRUE; + if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]); + else badarg = TRUE; + if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]); + else badarg = TRUE; + break; +#endif + + /* -MCP: set the smtp_use_pipelining flag; this is useful only when + it preceded -MC (see above) */ + + case 'P': smtp_peer_options |= OPTION_PIPE; break; + +#ifdef SUPPORT_SOCKS + /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */ + case 'p': proxy_session = TRUE; + if (++i < argc) + { + proxy_local_address = string_copy_taint(argv[i], GET_TAINTED); + if (++i < argc) + { + proxy_local_port = Uatoi(argv[i]); + if (++i < argc) + { + proxy_external_address = string_copy_taint(argv[i], GET_TAINTED); + if (++i < argc) + { + proxy_external_port = Uatoi(argv[i]); + break; + } } } } + badarg = TRUE; + break; +#endif + /* -MCQ: pass on the pid of the queue-running process that started + this chain of deliveries and the fd of its synchronizing pipe; this + is useful only when it precedes -MC (see above) */ + + case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i])); + else badarg = TRUE; + if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i])); + else badarg = TRUE; + break; + + /* -MCq: do a quota check on the given recipient for the given size + of message. Separate from -MC. */ + case 'q': rcpt_verify_quota = TRUE; + if (++i < argc) message_size = Uatoi(argv[i]); + else badarg = TRUE; + break; + + /* -MCS: set the smtp_use_size flag; this is useful only when it + precedes -MC (see above) */ + + case 'S': smtp_peer_options |= OPTION_SIZE; break; + +#ifndef DISABLE_TLS + /* -MCs: used with -MCt; SNI was sent */ + /* -MCr: ditto, DANE */ + + case 'r': + case 's': if (++i < argc) + { + continue_proxy_sni = string_copy_taint( + exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"), + GET_TAINTED); + if (argrest[1] == 'r') continue_proxy_dane = TRUE; + } + else badarg = TRUE; + break; + + /* -MCt: similar to -MCT below but the connection is still open + via a proxy process which handles the TLS context and coding. + Require three arguments for the proxied local address and port, + and the TLS cipher. */ + + case 't': if (++i < argc) + sending_ip_address = string_copy_taint( + exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"), + GET_TAINTED); + else badarg = TRUE; + if (++i < argc) + sending_port = (int)(Uatol(argv[i])); + else badarg = TRUE; + if (++i < argc) + continue_proxy_cipher = string_copy_taint( + exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"), + GET_TAINTED); + else badarg = TRUE; + /*FALLTHROUGH*/ + + /* -MCT: set the tls_offered flag; this is useful only when it + precedes -MC (see above). The flag indicates that the host to which + Exim is connected has offered TLS support. */ + + case 'T': smtp_peer_options |= OPTION_TLS; break; +#endif + + default: badarg = TRUE; break; + } + break; + } + + /* -M[x]: various operations on the following list of message ids: + -M deliver the messages, ignoring next retry times and thawing + -Mc deliver the messages, checking next retry times, no thawing + -Mf freeze the messages + -Mg give up on the messages + -Mt thaw the messages + -Mrm remove the messages + In the above cases, this must be the last option. There are also the + following options which are followed by a single message id, and which + act on that message. Some of them use the "recipient" addresses as well. + -Mar add recipient(s) + -MG move to a different queue + -Mmad mark all recipients delivered + -Mmd mark recipients(s) delivered + -Mes edit sender + -Mset load a message for use with -be + -Mvb show body + -Mvc show copy (of whole message, in RFC 2822 format) + -Mvh show header + -Mvl show log + */ + + else if (!*argrest) + { + msg_action = MSG_DELIVER; + forced_delivery = f.deliver_force_thaw = TRUE; + } + else if (Ustrcmp(argrest, "ar") == 0) + { + msg_action = MSG_ADD_RECIPIENT; + one_msg_action = TRUE; + } + else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER; + else if (Ustrcmp(argrest, "es") == 0) + { + msg_action = MSG_EDIT_SENDER; + one_msg_action = TRUE; + } + else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE; + else if (Ustrcmp(argrest, "g") == 0) + { + msg_action = MSG_DELIVER; + deliver_give_up = TRUE; + } + else if (Ustrcmp(argrest, "G") == 0) + { + msg_action = MSG_SETQUEUE; + queue_name_dest = string_copy_taint( + exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"), + GET_TAINTED); + } + else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED; + else if (Ustrcmp(argrest, "md") == 0) + { + msg_action = MSG_MARK_DELIVERED; + one_msg_action = TRUE; + } + else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE; + else if (Ustrcmp(argrest, "set") == 0) + { + msg_action = MSG_LOAD; + one_msg_action = TRUE; + } + else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW; + else if (Ustrcmp(argrest, "vb") == 0) + { + msg_action = MSG_SHOW_BODY; + one_msg_action = TRUE; + } + else if (Ustrcmp(argrest, "vc") == 0) + { + msg_action = MSG_SHOW_COPY; + one_msg_action = TRUE; + } + else if (Ustrcmp(argrest, "vh") == 0) + { + msg_action = MSG_SHOW_HEADER; + one_msg_action = TRUE; + } + else if (Ustrcmp(argrest, "vl") == 0) + { + msg_action = MSG_SHOW_LOG; + one_msg_action = TRUE; + } + else { badarg = TRUE; break; } + + /* All the -Mxx options require at least one message id. */ + + msg_action_arg = i + 1; + if (msg_action_arg >= argc) + exim_fail("exim: no message ids given after %s option\n", arg); + + /* Some require only message ids to follow */ + + if (!one_msg_action) + { + for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j])) + exim_fail("exim: malformed message id %s after %s option\n", + argv[j], arg); + goto END_ARG; /* Remaining args are ids */ + } + + /* Others require only one message id, possibly followed by addresses, + which will be handled as normal arguments. */ + + else + { + if (!mac_ismsgid(argv[msg_action_arg])) + exim_fail("exim: malformed message id %s after %s option\n", + argv[msg_action_arg], arg); + i++; + } + break; + + + /* Some programs seem to call the -om option without the leading o; + for sendmail it askes for "me too". Exim always does this. */ + + case 'm': + if (*argrest) badarg = TRUE; + break; + + + /* -N: don't do delivery - a debugging option that stops transports doing + their thing. It implies debugging at the D_v level. */ + + case 'N': + if (!*argrest) + { + f.dont_deliver = TRUE; + debug_selector |= D_v; + debug_file = stderr; + } + else badarg = TRUE; + break; + + + /* -n: This means "don't alias" in sendmail, apparently. + For normal invocations, it has no effect. + It may affect some other options. */ + + case 'n': + flag_n = TRUE; + break; + + /* -O: Just ignore it. In sendmail, apparently -O option=value means set + option to the specified value. This form uses long names. We need to handle + -O option=value and -Ooption=value. */ + + case 'O': + if (!*argrest) + if (++i >= argc) + exim_fail("exim: string expected after -O\n"); + break; + + case 'o': + switch (*argrest++) + { + /* -oA: Set an argument for the bi command (sendmail's "alternate alias + file" option). */ + case 'A': + if (!*(alias_arg = argrest)) + if (i+1 < argc) alias_arg = argv[++i]; + else exim_fail("exim: string expected after -oA\n"); + break; + + /* -oB: Set a connection message max value for remote deliveries */ + case 'B': + { + uschar * p = argrest; + if (!*p) + if (i+1 < argc && isdigit((argv[i+1][0]))) + p = argv[++i]; + else + { + connection_max_messages = 1; + p = NULL; + } + + if (p) + { + if (!isdigit(*p)) + exim_fail("exim: number expected after -oB\n"); + connection_max_messages = Uatoi(p); + } + } + break; + + /* -odb: background delivery */ + + case 'd': + if (Ustrcmp(argrest, "b") == 0) + { + f.synchronous_delivery = FALSE; + arg_queue_only = FALSE; + queue_only_set = TRUE; + } + + /* -odd: testsuite-only: add no inter-process delays */ + + else if (Ustrcmp(argrest, "d") == 0) + f.testsuite_delays = FALSE; + + /* -odf: foreground delivery (smail-compatible option); same effect as + -odi: interactive (synchronous) delivery (sendmail-compatible option) + */ + + else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0) + { + f.synchronous_delivery = TRUE; + arg_queue_only = FALSE; + queue_only_set = TRUE; + } + + /* -odq: queue only */ + + else if (Ustrcmp(argrest, "q") == 0) + { + f.synchronous_delivery = FALSE; + arg_queue_only = TRUE; + queue_only_set = TRUE; + } + + /* -odqs: queue SMTP only - do local deliveries and remote routing, + but no remote delivery */ + + else if (Ustrcmp(argrest, "qs") == 0) + { + f.queue_smtp = TRUE; + arg_queue_only = FALSE; + queue_only_set = TRUE; + } + else badarg = TRUE; + break; + + /* -oex: Sendmail error flags. As these are also accepted without the + leading -o prefix, for compatibility with vacation and other callers, + they are handled with -e above. */ + + /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i) + -oitrue: Another sendmail syntax for the same */ + + case 'i': + if (!*argrest || Ustrcmp(argrest, "true") == 0) + f.dot_ends = FALSE; + else badarg = TRUE; + break; + + /* -oM*: Set various characteristics for an incoming message; actually + acted on for trusted callers only. */ + + case 'M': + { + if (i+1 >= argc) + exim_fail("exim: data expected after -oM%s\n", argrest); + + /* -oMa: Set sender host address */ + + if (Ustrcmp(argrest, "a") == 0) + sender_host_address = string_copy_taint( + exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"), + GET_TAINTED); + + /* -oMaa: Set authenticator name */ + + else if (Ustrcmp(argrest, "aa") == 0) + sender_host_authenticated = string_copy_taint( + exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"), + GET_TAINTED); + + /* -oMas: setting authenticated sender */ + + else if (Ustrcmp(argrest, "as") == 0) + authenticated_sender = string_copy_taint( + exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), + GET_TAINTED); + + /* -oMai: setting authenticated id */ + + else if (Ustrcmp(argrest, "ai") == 0) + authenticated_id = string_copy_taint( + exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), + GET_TAINTED); + + /* -oMi: Set incoming interface address */ + + else if (Ustrcmp(argrest, "i") == 0) + interface_address = string_copy_taint( + exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"), + GET_TAINTED); + + /* -oMm: Message reference */ + + else if (Ustrcmp(argrest, "m") == 0) + { + if (!mac_ismsgid(argv[i+1])) + exim_fail("-oMm must be a valid message ID\n"); + if (!f.trusted_config) + exim_fail("-oMm must be called by a trusted user/config\n"); + message_reference = argv[++i]; + } + + /* -oMr: Received protocol */ + + else if (Ustrcmp(argrest, "r") == 0) + + if (received_protocol) + exim_fail("received_protocol is set already\n"); + else + received_protocol = string_copy_taint( + exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"), + GET_TAINTED); + + /* -oMs: Set sender host name */ + + else if (Ustrcmp(argrest, "s") == 0) + sender_host_name = string_copy_taint( + exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"), + GET_TAINTED); + + /* -oMt: Set sender ident */ + + else if (Ustrcmp(argrest, "t") == 0) + { + sender_ident_set = TRUE; + sender_ident = string_copy_taint( + exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"), + GET_TAINTED); + } + + /* Else a bad argument */ + + else + badarg = TRUE; + } + break; + + /* -om: Me-too flag for aliases. Exim always does this. Some programs + seem to call this as -m (undocumented), so that is also accepted (see + above). */ + /* -oo: An ancient flag for old-style addresses which still seems to + crop up in some calls (see in SCO). */ + + case 'm': + case 'o': + if (*argrest) badarg = TRUE; + break; + + /* -oP <name>: set pid file path for daemon + -oPX: delete pid file of daemon */ + + case 'P': + if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid) + exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX " + "(uid=%d euid=%d | %d)\n", + root_uid, exim_uid, getuid(), geteuid(), real_uid); + if (!*argrest) override_pid_file_path = argv[++i]; + else if (Ustrcmp(argrest, "X") == 0) delete_pid_file(); + else badarg = TRUE; + break; + + + /* -or <n>: set timeout for non-SMTP acceptance + -os <n>: set timeout for SMTP acceptance */ + + case 'r': + case 's': + { + int * tp = argrest[-1] == 'r' + ? &arg_receive_timeout : &arg_smtp_receive_timeout; + if (*argrest) + *tp = readconf_readtime(argrest, 0, FALSE); + else if (i+1 < argc) + *tp = readconf_readtime(argv[++i], 0, FALSE); + + if (*tp < 0) + exim_fail("exim: bad time value %s: abandoned\n", argv[i]); + } + break; + + /* -oX <list>: Override local_interfaces and/or default daemon ports */ + /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */ + + case 'X': + if (*argrest) badarg = TRUE; + else override_local_interfaces = string_copy_taint( + exim_str_fail_toolong(argv[++i], 1024, "-oX"), + GET_TAINTED); + break; + + /* -oY: Override creation of daemon notifier socket */ + + case 'Y': + if (*argrest) badarg = TRUE; + else notifier_socket = NULL; + break; + + /* Unknown -o argument */ + + default: + badarg = TRUE; + } + break; + + + /* -ps: force Perl startup; -pd force delayed Perl startup */ + + case 'p': + #ifdef EXIM_PERL + if (*argrest == 's' && argrest[1] == 0) + { + perl_start_option = 1; + break; + } + if (*argrest == 'd' && argrest[1] == 0) + { + perl_start_option = -1; + break; + } + #endif + + /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval, + which sets the host protocol and host name */ + + if (!*argrest) + if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; } + + if (*argrest) + { + uschar * hn = Ustrchr(argrest, ':'); + + if (received_protocol) + exim_fail("received_protocol is set already\n"); + + if (!hn) + received_protocol = string_copy_taint( + exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"), + GET_TAINTED); + else + { + (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>"); + received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED); + sender_host_name = string_copy_taint(hn + 1, GET_TAINTED); + } + } + break; + + + case 'q': + receiving_message = FALSE; + if (queue_interval >= 0) + exim_fail("exim: -q specified more than once\n"); + + /* -qq...: Do queue runs in a 2-stage manner */ + + if (*argrest == 'q') + { + f.queue_2stage = TRUE; + argrest++; + } + + /* -qi...: Do only first (initial) deliveries */ + + if (*argrest == 'i') + { + f.queue_run_first_delivery = TRUE; + argrest++; + } + + /* -qf...: Run the queue, forcing deliveries + -qff..: Ditto, forcing thawing as well */ + + if (*argrest == 'f') + { + f.queue_run_force = TRUE; + if (*++argrest == 'f') + { + f.deliver_force_thaw = TRUE; + argrest++; + } + } + + /* -q[f][f]l...: Run the queue only on local deliveries */ + + if (*argrest == 'l') + { + f.queue_run_local = TRUE; + argrest++; + } + + /* -q[f][f][l][G<name>]... Work on the named queue */ + + if (*argrest == 'G') + { + int i; + for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++; + exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>"); + queue_name = string_copyn(argrest, i); + argrest += i; + if (*argrest == '/') argrest++; + } + + /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local + only, optionally named, optionally starting from a given message id. */ + + if (!(list_queue || count_queue)) + if ( !*argrest + && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1]))) + { + queue_interval = 0; + if (i+1 < argc && mac_ismsgid(argv[i+1])) + start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED); + if (i+1 < argc && mac_ismsgid(argv[i+1])) + stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED); + } + + /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally + forced, optionally local only, optionally named. */ + + else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i], + 0, FALSE)) <= 0) + exim_fail("exim: bad time value %s: abandoned\n", argv[i]); + break; + + + case 'R': /* Synonymous with -qR... */ + { + const uschar *tainted_selectstr; + + receiving_message = FALSE; + + /* -Rf: As -R (below) but force all deliveries, + -Rff: Ditto, but also thaw all frozen messages, + -Rr: String is regex + -Rrf: Regex and force + -Rrff: Regex and force and thaw + + in all cases provided there are no further characters in this + argument. */ + + if (*argrest) + for (int i = 0; i < nelem(rsopts); i++) + if (Ustrcmp(argrest, rsopts[i]) == 0) + { + if (i != 2) f.queue_run_force = TRUE; + if (i >= 2) f.deliver_selectstring_regex = TRUE; + if (i == 1 || i == 4) f.deliver_force_thaw = TRUE; + argrest += Ustrlen(rsopts[i]); + } + + /* -R: Set string to match in addresses for forced queue run to + pick out particular messages. */ + + /* Avoid attacks from people providing very long strings, and do so before + we make copies. */ + if (*argrest) + tainted_selectstr = argrest; + else if (i+1 < argc) + tainted_selectstr = argv[++i]; + else + exim_fail("exim: string expected after -R\n"); + deliver_selectstring = string_copy_taint( + exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"), + GET_TAINTED); + } + break; + + /* -r: an obsolete synonym for -f (see above) */ + + + /* -S: Like -R but works on sender. */ + + case 'S': /* Synonymous with -qS... */ + { + const uschar *tainted_selectstr; + + receiving_message = FALSE; + + /* -Sf: As -S (below) but force all deliveries, + -Sff: Ditto, but also thaw all frozen messages, + -Sr: String is regex + -Srf: Regex and force + -Srff: Regex and force and thaw + + in all cases provided there are no further characters in this + argument. */ + + if (*argrest) + for (int i = 0; i < nelem(rsopts); i++) + if (Ustrcmp(argrest, rsopts[i]) == 0) + { + if (i != 2) f.queue_run_force = TRUE; + if (i >= 2) f.deliver_selectstring_sender_regex = TRUE; + if (i == 1 || i == 4) f.deliver_force_thaw = TRUE; + argrest += Ustrlen(rsopts[i]); + } + + /* -S: Set string to match in addresses for forced queue run to + pick out particular messages. */ + + if (*argrest) + tainted_selectstr = argrest; + else if (i+1 < argc) + tainted_selectstr = argv[++i]; + else + exim_fail("exim: string expected after -S\n"); + deliver_selectstring_sender = string_copy_taint( + exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"), + GET_TAINTED); + } + break; + + /* -Tqt is an option that is exclusively for use by the testing suite. + It is not recognized in other circumstances. It allows for the setting up + of explicit "queue times" so that various warning/retry things can be + tested. Otherwise variability of clock ticks etc. cause problems. */ + + case 'T': + if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0) + fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED); + else badarg = TRUE; + break; + + + /* -t: Set flag to extract recipients from body of message. */ + + case 't': + if (!*argrest) extract_recipients = TRUE; + + /* -ti: Set flag to extract recipients from body of message, and also + specify that dot does not end the message. */ + + else if (Ustrcmp(argrest, "i") == 0) + { + extract_recipients = TRUE; + f.dot_ends = FALSE; + } + + /* -tls-on-connect: don't wait for STARTTLS (for old clients) */ + + #ifndef DISABLE_TLS + else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE; + #endif + + else badarg = TRUE; + break; + + + /* -U: This means "initial user submission" in sendmail, apparently. The + doc claims that in future sendmail may refuse syntactically invalid + messages instead of fixing them. For the moment, we just ignore it. */ + + case 'U': + break; + + + /* -v: verify things - this is a very low-level debugging */ + + case 'v': + if (!*argrest) + { + debug_selector |= D_v; + debug_file = stderr; + } + else badarg = TRUE; + break; + + + /* -x: AIX uses this to indicate some fancy 8-bit character stuff: + + The -x flag tells the sendmail command that mail from a local + mail program has National Language Support (NLS) extended characters + in the body of the mail item. The sendmail command can send mail with + extended NLS characters across networks that normally corrupts these + 8-bit characters. + + As Exim is 8-bit clean, it just ignores this flag. */ + + case 'x': + if (*argrest) badarg = TRUE; + break; + + /* -X: in sendmail: takes one parameter, logfile, and sends debugging + logs to that file. We swallow the parameter and otherwise ignore it. */ + + case 'X': + if (!*argrest) + if (++i >= argc) + exim_fail("exim: string expected after -X\n"); + break; + + /* -z: a line of text to log */ + + case 'z': + if (!*argrest) + if (++i < argc) + log_oneline = string_copy_taint( + exim_str_fail_toolong(argv[i], 2048, "-z logtext"), + GET_TAINTED); + else + exim_fail("exim: file name expected after %s\n", argv[i-1]); + break; + + /* All other initial characters are errors */ + + default: + badarg = TRUE; + break; + } /* End of high-level switch statement */ + + /* Failed to recognize the option, or syntax error */ + + if (badarg) + exim_fail("exim abandoned: unknown, malformed, or incomplete " + "option %s\n", arg); + } + + +/* If -R or -S have been specified without -q, assume a single queue run. */ + + if ( (deliver_selectstring || deliver_selectstring_sender) + && queue_interval < 0) + queue_interval = 0; + + +END_ARG: + store_pool = old_pool; + } + +/* If usage_wanted is set we call the usage function - which never returns */ +if (usage_wanted) exim_usage(called_as); + +/* Arguments have been processed. Check for incompatibilities. */ +if ( ( (smtp_input || extract_recipients || recipients_arg < argc) + && ( f.daemon_listen || queue_interval >= 0 || bi_option + || test_retry_arg >= 0 || test_rewrite_arg >= 0 + || filter_test != FTEST_NONE + || msg_action_arg > 0 && !one_msg_action + ) ) + || ( msg_action_arg > 0 + && ( f.daemon_listen || queue_interval > 0 || list_options + || checking && msg_action != MSG_LOAD + || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0 + ) ) + || ( (f.daemon_listen || queue_interval > 0) + && ( sender_address || list_options || list_queue || checking + || bi_option + ) ) + || f.daemon_listen && queue_interval == 0 + || f.inetd_wait_mode && queue_interval >= 0 + || ( list_options + && ( checking || smtp_input || extract_recipients + || filter_test != FTEST_NONE || bi_option + ) ) + || ( verify_address_mode + && ( f.address_test_mode || smtp_input || extract_recipients + || filter_test != FTEST_NONE || bi_option + ) ) + || ( f.address_test_mode + && ( smtp_input || extract_recipients || filter_test != FTEST_NONE + || bi_option + ) ) + || ( smtp_input + && (sender_address || filter_test != FTEST_NONE || extract_recipients) + ) + || deliver_selectstring && queue_interval < 0 + || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message) + ) + exim_fail("exim: incompatible command-line options or arguments\n"); + +/* If debugging is set up, set the file and the file descriptor to pass on to +child processes. It should, of course, be 2 for stderr. Also, force the daemon +to run in the foreground. */ + +if (debug_selector != 0) + { + debug_file = stderr; + debug_fd = fileno(debug_file); + f.background_daemon = FALSE; + testharness_pause_ms(100); /* lets caller finish */ + if (debug_selector != D_v) /* -v only doesn't show this */ + { + debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n", + version_string, (long int)real_uid, (long int)real_gid, (int)getpid(), + debug_selector); + if (!version_printed) + show_whats_supported(FALSE); + } + } + +/* When started with root privilege, ensure that the limits on the number of +open files and the number of processes (where that is accessible) are +sufficiently large, or are unset, in case Exim has been called from an +environment where the limits are screwed down. Not all OS have the ability to +change some of these limits. */ + +if (unprivileged) + { + DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:"); + } +else + { + struct rlimit rlp; + +#ifdef RLIMIT_NOFILE + if (getrlimit(RLIMIT_NOFILE, &rlp) < 0) + { + log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s", + strerror(errno)); + rlp.rlim_cur = rlp.rlim_max = 0; + } + + /* I originally chose 1000 as a nice big number that was unlikely to + be exceeded. It turns out that some older OS have a fixed upper limit of + 256. */ + + if (rlp.rlim_cur < 1000) + { + rlp.rlim_cur = rlp.rlim_max = 1000; + if (setrlimit(RLIMIT_NOFILE, &rlp) < 0) + { + rlp.rlim_cur = rlp.rlim_max = 256; + if (setrlimit(RLIMIT_NOFILE, &rlp) < 0) + log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s", + strerror(errno)); + } + } +#endif + +#ifdef RLIMIT_NPROC + if (getrlimit(RLIMIT_NPROC, &rlp) < 0) + { + log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s", + strerror(errno)); + rlp.rlim_cur = rlp.rlim_max = 0; + } + +# ifdef RLIM_INFINITY + if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000) + { + rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY; +# else + if (rlp.rlim_cur < 1000) + { + rlp.rlim_cur = rlp.rlim_max = 1000; +# endif + if (setrlimit(RLIMIT_NPROC, &rlp) < 0) + log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s", + strerror(errno)); + } +#endif + } + +/* Exim is normally entered as root (but some special configurations are +possible that don't do this). However, it always spins off sub-processes that +set their uid and gid as required for local delivery. We don't want to pass on +any extra groups that root may belong to, so we want to get rid of them all at +this point. + +We need to obey setgroups() at this stage, before possibly giving up root +privilege for a changed configuration file, but later on we might need to +check on the additional groups for the admin user privilege - can't do that +till after reading the config, which might specify the exim gid. Therefore, +save the group list here first. */ + +if ((group_count = getgroups(nelem(group_list), group_list)) < 0) + exim_fail("exim: getgroups() failed: %s\n", strerror(errno)); + +/* There is a fundamental difference in some BSD systems in the matter of +groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are +known not to be different. On the "different" systems there is a single group +list, and the first entry in it is the current group. On all other versions of +Unix there is a supplementary group list, which is in *addition* to the current +group. Consequently, to get rid of all extraneous groups on a "standard" system +you pass over 0 groups to setgroups(), while on a "different" system you pass +over a single group - the current group, which is always the first group in the +list. Calling setgroups() with zero groups on a "different" system results in +an error return. The following code should cope with both types of system. + + Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds + the "setgroups() with zero groups" - and changes the egid. + Thanks to that we had to stash the original_egid above, for use below + in the call to exim_setugid(). + +However, if this process isn't running as root, setgroups() can't be used +since you have to be root to run it, even if throwing away groups. +Except, sigh, for Hurd - where you can. +Not being root here happens only in some unusual configurations. */ + +if ( !unprivileged +#ifndef OS_SETGROUPS_ZERO_DROPS_ALL + && setgroups(0, NULL) != 0 +#endif + && setgroups(1, group_list) != 0) + exim_fail("exim: setgroups() failed: %s\n", strerror(errno)); + +/* If the configuration file name has been altered by an argument on the +command line (either a new file name or a macro definition) and the caller is +not root, or if this is a filter testing run, remove any setuid privilege the +program has and run as the underlying user. + +The exim user is locked out of this, which severely restricts the use of -C +for some purposes. + +Otherwise, set the real ids to the effective values (should be root unless run +from inetd, which it can either be root or the exim uid, if one is configured). + +There is a private mechanism for bypassing some of this, in order to make it +possible to test lots of configurations automatically, without having either to +recompile each time, or to patch in an actual configuration file name and other +values (such as the path name). If running in the test harness, pretend that +configuration file changes and macro definitions haven't happened. */ + +if (( /* EITHER */ + (!f.trusted_config || /* Config changed, or */ + !macros_trusted(opt_D_used)) && /* impermissible macros and */ + real_uid != root_uid && /* Not root, and */ + !f.running_in_test_harness /* Not fudged */ + ) || /* OR */ + expansion_test /* expansion testing */ + || /* OR */ + filter_test != FTEST_NONE) /* Filter testing */ + { + setgroups(group_count, group_list); + exim_setugid(real_uid, real_gid, FALSE, + US"-C, -D, -be or -bf forces real uid"); + removed_privilege = TRUE; + + /* In the normal case when Exim is called like this, stderr is available + and should be used for any logging information because attempts to write + to the log will usually fail. To arrange this, we unset really_exim. However, + if no stderr is available there is no point - we might as well have a go + at the log (if it fails, syslog will be written). + + Note that if the invoker is Exim, the logs remain available. Messing with + this causes unlogged successful deliveries. */ + + if (log_stderr && real_uid != exim_uid) + f.really_exim = FALSE; + } + +/* Privilege is to be retained for the moment. It may be dropped later, +depending on the job that this Exim process has been asked to do. For now, set +the real uid to the effective so that subsequent re-execs of Exim are done by a +privileged user. */ + +else + exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective"); + +/* If testing a filter, open the file(s) now, before wasting time doing other +setups and reading the message. */ + +if (filter_test & FTEST_SYSTEM) + if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0) + exim_fail("exim: failed to open %s: %s\n", filter_test_sfile, + strerror(errno)); + +if (filter_test & FTEST_USER) + if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0) + exim_fail("exim: failed to open %s: %s\n", filter_test_ufile, + strerror(errno)); + +/* Initialise lookup_list +If debugging, already called above via version reporting. +In either case, we initialise the list of available lookups while running +as root. All dynamically modules are loaded from a directory which is +hard-coded into the binary and is code which, if not a module, would be +part of Exim already. Ability to modify the content of the directory +is equivalent to the ability to modify a setuid binary! + +This needs to happen before we read the main configuration. */ +init_lookup_list(); + +/*XXX this excrescence could move to the testsuite standard config setup file */ +#ifdef SUPPORT_I18N +if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL; +#endif + +/* Read the main runtime configuration data; this gives up if there +is a failure. It leaves the configuration file open so that the subsequent +configuration data for delivery can be read if needed. + +NOTE: immediately after opening the configuration file we change the working +directory to "/"! Later we change to $spool_directory. We do it there, because +during readconf_main() some expansion takes place already. */ + +/* Store the initial cwd before we change directories. Can be NULL if the +dir has already been unlinked. */ +initial_cwd = os_getcwd(NULL, 0); +if (!initial_cwd && errno) + exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno)); + +if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE)) + exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd)); + +/* checking: + -be[m] expansion test - + -b[fF] filter test new + -bh[c] host test - + -bmalware malware_test_file new + -brt retry test new + -brw rewrite test new + -bt address test - + -bv[s] address verify - + list_options: + -bP <option> (except -bP config, which sets list_config) + +If any of these options is set, we suppress warnings about configuration +issues (currently about tls_advertise_hosts and keep_environment not being +defined) */ + + { + int old_pool = store_pool; +#ifdef MEASURE_TIMING + struct timeval t0; + (void)gettimeofday(&t0, NULL); +#endif + + store_pool = POOL_CONFIG; + readconf_main(checking || list_options); + store_pool = old_pool; + +#ifdef MEASURE_TIMING + report_time_since(&t0, US"readconf_main (delta)"); +#endif + } + +/* Now in directory "/" */ + +if (cleanup_environment() == FALSE) + log_write(0, LOG_PANIC_DIE, "Can't cleanup environment"); + + +/* If an action on specific messages is requested, or if a daemon or queue +runner is being started, we need to know if Exim was called by an admin user. +This is the case if the real user is root or exim, or if the real group is +exim, or if one of the supplementary groups is exim or a group listed in +admin_groups. We don't fail all message actions immediately if not admin_user, +since some actions can be performed by non-admin users. Instead, set admin_user +for later interrogation. */ + +if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid) + f.admin_user = TRUE; +else + for (int i = 0; i < group_count && !f.admin_user; i++) + if (group_list[i] == exim_gid) + f.admin_user = TRUE; + else if (admin_groups) + for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++) + if (admin_groups[j] == group_list[i]) + f.admin_user = TRUE; + +/* Another group of privileged users are the trusted users. These are root, +exim, and any caller matching trusted_users or trusted_groups. Trusted callers +are permitted to specify sender_addresses with -f on the command line, and +other message parameters as well. */ + +if (real_uid == root_uid || real_uid == exim_uid) + f.trusted_caller = TRUE; +else + { + if (trusted_users) + for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++) + if (trusted_users[i] == real_uid) + f.trusted_caller = TRUE; + + if (trusted_groups) + for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++) + if (trusted_groups[i] == real_gid) + f.trusted_caller = TRUE; + else for (int j = 0; j < group_count && !f.trusted_caller; j++) + if (trusted_groups[i] == group_list[j]) + f.trusted_caller = TRUE; + } + +/* At this point, we know if the user is privileged and some command-line +options become possibly impermissible, depending upon the configuration file. */ + +if (checking && commandline_checks_require_admin && !f.admin_user) + exim_fail("exim: those command-line flags are set to require admin\n"); + +/* Handle the decoding of logging options. */ + +decode_bits(log_selector, log_selector_size, log_notall, + log_selector_string, log_options, log_options_count, US"log", 0); + +DEBUG(D_any) + { + debug_printf("configuration file is %s\n", config_main_filename); + debug_printf("log selectors ="); + for (int i = 0; i < log_selector_size; i++) + debug_printf(" %08x", log_selector[i]); + debug_printf("\n"); + } + +/* If domain literals are not allowed, check the sender address that was +supplied with -f. Ditto for a stripped trailing dot. */ + +if (sender_address) + { + if (sender_address[sender_address_domain] == '[' && !allow_domain_literals) + exim_fail("exim: bad -f address \"%s\": domain literals not " + "allowed\n", sender_address); + if (f_end_dot && !strip_trailing_dot) + exim_fail("exim: bad -f address \"%s.\": domain is malformed " + "(trailing dot not allowed)\n", sender_address); + } + +/* See if an admin user overrode our logging. */ + +if (cmdline_syslog_name) + if (f.admin_user) + { + syslog_processname = cmdline_syslog_name; + log_file_path = string_copy(CUS"syslog"); + } + else + /* not a panic, non-privileged users should not be able to spam paniclog */ + exim_fail( + "exim: you lack sufficient privilege to specify syslog process name\n"); + +/* Paranoia check of maximum lengths of certain strings. There is a check +on the length of the log file path in log.c, which will come into effect +if there are any calls to write the log earlier than this. However, if we +get this far but the string is very long, it is better to stop now than to +carry on and (e.g.) receive a message and then have to collapse. The call to +log_write() from here will cause the ultimate panic collapse if the complete +file name exceeds the buffer length. */ + +if (Ustrlen(log_file_path) > 200) + log_write(0, LOG_MAIN|LOG_PANIC_DIE, + "log_file_path is longer than 200 chars: aborting"); + +if (Ustrlen(pid_file_path) > 200) + log_write(0, LOG_MAIN|LOG_PANIC_DIE, + "pid_file_path is longer than 200 chars: aborting"); + +if (Ustrlen(spool_directory) > 200) + log_write(0, LOG_MAIN|LOG_PANIC_DIE, + "spool_directory is longer than 200 chars: aborting"); + +/* Length check on the process name given to syslog for its TAG field, +which is only permitted to be 32 characters or less. See RFC 3164. */ + +if (Ustrlen(syslog_processname) > 32) + log_write(0, LOG_MAIN|LOG_PANIC_DIE, + "syslog_processname is longer than 32 chars: aborting"); + +if (log_oneline) + if (f.admin_user) + { + log_write(0, LOG_MAIN, "%s", log_oneline); + return EXIT_SUCCESS; + } + else + return EXIT_FAILURE; + +/* In some operating systems, the environment variable TMPDIR controls where +temporary files are created; Exim doesn't use these (apart from when delivering +to MBX mailboxes), but called libraries such as DBM libraries may require them. +If TMPDIR is found in the environment, reset it to the value defined in the +EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this +macro may be called TMPDIR in old "Local/Makefile"s. It's converted to +EXIM_TMPDIR by the build scripts. +*/ + +#ifdef EXIM_TMPDIR + if (environ) for (uschar ** p = USS environ; *p; p++) + if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0) + { + uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8); + sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR); + *p = newp; + DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR); + } +#endif + +/* Timezone handling. If timezone_string is "utc", set a flag to cause all +timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise, +we may need to get rid of a bogus timezone setting. This can arise when Exim is +called by a user who has set the TZ variable. This then affects the timestamps +in log files and in Received: headers, and any created Date: header lines. The +required timezone is settable in the configuration file, so nothing can be done +about this earlier - but hopefully nothing will normally be logged earlier than +this. We have to make a new environment if TZ is wrong, but don't bother if +timestamps_utc is set, because then all times are in UTC anyway. */ + +if (timezone_string && strcmpic(timezone_string, US"UTC") == 0) + f.timestamps_utc = TRUE; +else + { + uschar *envtz = US getenv("TZ"); + if (envtz + ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0 + : timezone_string != NULL + ) + { + uschar **p = USS environ; + uschar **new; + uschar **newp; + int count = 0; + if (environ) while (*p++) count++; + if (!envtz) count++; + newp = new = store_malloc(sizeof(uschar *) * (count + 1)); + if (environ) for (p = USS environ; *p; p++) + if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p; + if (timezone_string) + { + *newp = store_malloc(Ustrlen(timezone_string) + 4); + sprintf(CS *newp++, "TZ=%s", timezone_string); + } + *newp = NULL; + environ = CSS new; + tzset(); + DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string, + tod_stamp(tod_log)); + } + } + +/* Handle the case when we have removed the setuid privilege because of -C or +-D. This means that the caller of Exim was not root. + +There is a problem if we were running as the Exim user. The sysadmin may +expect this case to retain privilege because "the binary was called by the +Exim user", but it hasn't, because either the -D option set macros, or the +-C option set a non-trusted configuration file. There are two possibilities: + + (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order + to do message deliveries. Thus, the fact that it is running as a + non-privileged user is plausible, and might be wanted in some special + configurations. However, really_exim will have been set false when + privilege was dropped, to stop Exim trying to write to its normal log + files. Therefore, re-enable normal log processing, assuming the sysadmin + has set up the log directory correctly. + + (2) If deliver_drop_privilege is not set, the configuration won't work as + apparently intended, and so we log a panic message. In order to retain + root for -C or -D, the caller must either be root or be invoking a + trusted configuration file (when deliver_drop_privilege is false). */ + +if ( removed_privilege + && (!f.trusted_config || opt_D_used) + && real_uid == exim_uid) + if (deliver_drop_privilege) + f.really_exim = TRUE; /* let logging work normally */ + else + log_write(0, LOG_MAIN|LOG_PANIC, + "exim user lost privilege for using %s option", + f.trusted_config? "-D" : "-C"); + +/* Start up Perl interpreter if Perl support is configured and there is a +perl_startup option, and the configuration or the command line specifies +initializing starting. Note that the global variables are actually called +opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */ + +#ifdef EXIM_PERL +if (perl_start_option != 0) + opt_perl_at_start = (perl_start_option > 0); +if (opt_perl_at_start && opt_perl_startup != NULL) + { + uschar *errstr; + DEBUG(D_any) debug_printf("Starting Perl interpreter\n"); + if ((errstr = init_perl(opt_perl_startup))) + exim_fail("exim: error in perl_startup code: %s\n", errstr); + opt_perl_started = TRUE; + } +#endif /* EXIM_PERL */ + +/* Log the arguments of the call if the configuration file said so. This is +a debugging feature for finding out what arguments certain MUAs actually use. +Don't attempt it if logging is disabled, or if listing variables or if +verifying/testing addresses or expansions. */ + +if ( (debug_selector & D_any || LOGGING(arguments)) + && f.really_exim && !list_options && !checking) + { + uschar *p = big_buffer; + Ustrcpy(p, US"cwd= (failed)"); + + if (!initial_cwd) + p += 13; + else + { + p += 4; + snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd); + p += Ustrlen(CCS p); + } + + (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc); + while (*p) p++; + for (int i = 0; i < argc; i++) + { + int len = Ustrlen(argv[i]); + const uschar *printing; + uschar *quote; + if (p + len + 8 >= big_buffer + big_buffer_size) + { + Ustrcpy(p, US" ..."); + log_write(0, LOG_MAIN, "%s", big_buffer); + Ustrcpy(big_buffer, US"..."); + p = big_buffer + 3; + } + printing = string_printing(argv[i]); + if (!*printing) quote = US"\""; + else + { + const uschar *pp = printing; + quote = US""; + while (*pp) if (isspace(*pp++)) { quote = US"\""; break; } + } + p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size - + (p - big_buffer) - 4), printing, quote); + } + + if (LOGGING(arguments)) + log_write(0, LOG_MAIN, "%s", big_buffer); + else + debug_printf("%s\n", big_buffer); + } + +/* Set the working directory to be the top-level spool directory. We don't rely +on this in the code, which always uses fully qualified names, but it's useful +for core dumps etc. Don't complain if it fails - the spool directory might not +be generally accessible and calls with the -C option (and others) have lost +privilege by now. Before the chdir, we try to ensure that the directory exists. +*/ + +if (Uchdir(spool_directory) != 0) + { + (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE); + (void) Uchdir(spool_directory); + } + +/* Handle calls with the -bi option. This is a sendmail option to rebuild *the* +alias file. Exim doesn't have such a concept, but this call is screwed into +Sun's YP makefiles. Handle this by calling a configured script, as the real +user who called Exim. The -oA option can be used to pass an argument to the +script. */ + +if (bi_option) + { + (void) fclose(config_file); + if (bi_command && *bi_command) + { + int i = 0; + uschar *argv[3]; + argv[i++] = bi_command; /* nonexpanded option so assume untainted */ + if (alias_arg) argv[i++] = alias_arg; + argv[i++] = NULL; + + setgroups(group_count, group_list); + exim_setugid(real_uid, real_gid, FALSE, US"running bi_command"); + + DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0], + argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : ""); + + execv(CS argv[0], (char *const *)argv); + exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno)); + } + else + { + DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n"); + exit(EXIT_SUCCESS); + } + } + +/* We moved the admin/trusted check to be immediately after reading the +configuration file. We leave these prints here to ensure that syslog setup, +logfile setup, and so on has already happened. */ + +if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n"); +if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n"); + +/* Only an admin user may start the daemon or force a queue run in the default +configuration, but the queue run restriction can be relaxed. Only an admin +user may request that a message be returned to its sender forthwith. Only an +admin user may specify a debug level greater than D_v (because it might show +passwords, etc. in lookup queries). Only an admin user may request a queue +count. Only an admin user can use the test interface to scan for email +(because Exim will be in the spool dir and able to look at mails). */ + +if (!f.admin_user) + { + BOOL debugset = (debug_selector & ~D_v) != 0; + if ( deliver_give_up || f.daemon_listen || malware_test_file + || count_queue && queue_list_requires_admin + || list_queue && queue_list_requires_admin + || queue_interval >= 0 && prod_requires_admin + || queue_name_dest && prod_requires_admin + || debugset && !f.running_in_test_harness + ) + exim_fail("exim:%s permission denied\n", debugset ? " debugging" : ""); + } + +/* If the real user is not root or the exim uid, the argument for passing +in an open TCP/IP connection for another message is not permitted, nor is +running with the -N option for any delivery action, unless this call to exim is +one that supplied an input message, or we are using a patched exim for +regression testing. */ + +if ( real_uid != root_uid && real_uid != exim_uid + && ( continue_hostname + || ( f.dont_deliver + && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0) + ) ) + && !f.running_in_test_harness + ) + exim_fail("exim: Permission denied\n"); + +/* If the caller is not trusted, certain arguments are ignored when running for +real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF). +Note that authority for performing certain actions on messages is tested in the +queue_action() function. */ + +if (!f.trusted_caller && !checking) + { + sender_host_name = sender_host_address = interface_address = + sender_ident = received_protocol = NULL; + sender_host_port = interface_port = 0; + sender_host_authenticated = authenticated_sender = authenticated_id = NULL; + } + +/* If a sender host address is set, extract the optional port number off the +end of it and check its syntax. Do the same thing for the interface address. +Exim exits if the syntax is bad. */ + +else + { + if (sender_host_address) + sender_host_port = check_port(sender_host_address); + if (interface_address) + interface_port = check_port(interface_address); + } + +/* If the caller is trusted, then they can use -G to suppress_local_fixups. */ +if (flag_G) + { + if (f.trusted_caller) + { + f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE; + DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n"); + } + else + exim_fail("exim: permission denied (-G requires a trusted user)\n"); + } + +/* If an SMTP message is being received check to see if the standard input is a +TCP/IP socket. If it is, we assume that Exim was called from inetd if the +caller is root or the Exim user, or if the port is a privileged one. Otherwise, +barf. */ + +if (smtp_input) + { + union sockaddr_46 inetd_sock; + EXIM_SOCKLEN_T size = sizeof(inetd_sock); + if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0) + { + int family = ((struct sockaddr *)(&inetd_sock))->sa_family; + if (family == AF_INET || family == AF_INET6) + { + union sockaddr_46 interface_sock; + size = sizeof(interface_sock); + + if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0) + interface_address = host_ntoa(-1, &interface_sock, NULL, + &interface_port); + + if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE; + + if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024) + { + f.is_inetd = TRUE; + sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock), + NULL, &sender_host_port); + if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from " + "inetd is not supported when mua_wrapper is set"); + } + else + exim_fail( + "exim: Permission denied (unprivileged user, unprivileged port)\n"); + } + } + } + +/* If the load average is going to be needed while receiving a message, get it +now for those OS that require the first call to os_getloadavg() to be done as +root. There will be further calls later for each message received. */ + +#ifdef LOAD_AVG_NEEDS_ROOT +if ( receiving_message + && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0))) + load_average = OS_GETLOADAVG(); +#endif + +/* The queue_only configuration option can be overridden by -odx on the command +line, except that if queue_only_override is false, queue_only cannot be unset +from the command line. */ + +if (queue_only_set && (queue_only_override || arg_queue_only)) + queue_only = arg_queue_only; + +/* The receive_timeout and smtp_receive_timeout options can be overridden by +-or and -os. */ + +if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout; +if (arg_smtp_receive_timeout >= 0) + smtp_receive_timeout = arg_smtp_receive_timeout; + +/* If Exim was started with root privilege, unless we have already removed the +root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now +except when starting the daemon or doing some kind of delivery or address +testing (-bt). These are the only cases when root need to be retained. We run +as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is +retained only for starting the daemon. We always do the initgroups() in this +situation (controlled by the TRUE below), in order to be as close as possible +to the state Exim usually runs in. */ + +if ( !unprivileged /* originally had root AND */ + && !removed_privilege /* still got root AND */ + && !f.daemon_listen /* not starting the daemon */ + && queue_interval <= 0 /* (either kind of daemon) */ + && ( /* AND EITHER */ + deliver_drop_privilege /* requested unprivileged */ + || ( /* OR */ + queue_interval < 0 /* not running the queue */ + && ( msg_action_arg < 0 /* and */ + || msg_action != MSG_DELIVER /* not delivering */ + ) /* and */ + && (!checking || !f.address_test_mode) /* not address checking */ + && !rcpt_verify_quota /* and not quota checking */ + ) ) ) + exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed"); + +/* When we are retaining a privileged uid, we still change to the exim gid. */ + +else + { + int rv; + DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n"); + rv = setgid(exim_gid); + /* Impact of failure is that some stuff might end up with an incorrect group. + We track this for failures from root, since any attempt to change privilege + by root should succeed and failures should be examined. For non-root, + there's no security risk. For me, it's { exim -bV } on a just-built binary, + no need to complain then. */ + if (rv == -1) + if (!(unprivileged || removed_privilege)) + exim_fail("exim: changing group failed: %s\n", strerror(errno)); + else + { + DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n", + (long int)exim_gid, strerror(errno)); + } + } + +/* Handle a request to scan a file for malware */ +if (malware_test_file) + { +#ifdef WITH_CONTENT_SCAN + int result; + set_process_info("scanning file for malware"); + if ((result = malware_in_file(malware_test_file)) == FAIL) + { + printf("No malware found.\n"); + exit(EXIT_SUCCESS); + } + if (result != OK) + { + printf("Malware lookup returned non-okay/fail: %d\n", result); + exit(EXIT_FAILURE); + } + if (malware_name) + printf("Malware found: %s\n", malware_name); + else + printf("Malware scan detected malware of unknown name.\n"); +#else + printf("Malware scanning not enabled at compile time.\n"); +#endif + exit(EXIT_FAILURE); + } + +/* Handle a request to list the delivery queue */ + +if (list_queue) + { + set_process_info("listing the queue"); + queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg); + exit(EXIT_SUCCESS); + } + +/* Handle a request to count the delivery queue */ + +if (count_queue) + { + set_process_info("counting the queue"); + fprintf(stdout, "%u\n", queue_count()); + exit(EXIT_SUCCESS); + } + +/* Handle actions on specific messages, except for the force delivery and +message load actions, which are done below. Some actions take a whole list of +message ids, which are known to continue up to the end of the arguments. Others +take a single message id and then operate on the recipients list. */ + +if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD) + { + int yield = EXIT_SUCCESS; + set_process_info("acting on specified messages"); + + /* ACL definitions may be needed when removing a message (-Mrm) because + event_action gets expanded */ + + if (msg_action == MSG_REMOVE) + { + int old_pool = store_pool; + store_pool = POOL_CONFIG; + readconf_rest(); + store_pool = old_pool; + store_writeprotect(POOL_CONFIG); + } + + if (!one_msg_action) + { + for (i = msg_action_arg; i < argc; i++) + if (!queue_action(argv[i], msg_action, NULL, 0, 0)) + yield = EXIT_FAILURE; + switch (msg_action) + { + case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break; + default: printf("\n"); break; + } + } + + else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc, + recipients_arg)) yield = EXIT_FAILURE; + exit(yield); + } + +/* We used to set up here to skip reading the ACL section, on + (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen) +Now, since the intro of the ${acl } expansion, ACL definitions may be +needed in transports so we lost the optimisation. */ + + { + int old_pool = store_pool; +#ifdef MEASURE_TIMING + struct timeval t0; + (void)gettimeofday(&t0, NULL); +#endif + + store_pool = POOL_CONFIG; + readconf_rest(); + store_pool = old_pool; + + /* -be can add macro definitions, needing to link to the macro structure + chain. Otherwise, make the memory used for config data readonly. */ + + if (!expansion_test) + store_writeprotect(POOL_CONFIG); + +#ifdef MEASURE_TIMING + report_time_since(&t0, US"readconf_rest (delta)"); +#endif + } + +/* Handle a request to check quota */ +if (rcpt_verify_quota) + if (real_uid != root_uid && real_uid != exim_uid) + exim_fail("exim: Permission denied\n"); + else if (recipients_arg >= argc) + exim_fail("exim: missing recipient for quota check\n"); + else + { + verify_quota(argv[recipients_arg]); + exim_exit(EXIT_SUCCESS); + } + +/* Handle the -brt option. This is for checking out retry configurations. +The next three arguments are a domain name or a complete address, and +optionally two error numbers. All it does is to call the function that +scans the retry configuration data. */ + +if (test_retry_arg >= 0) + { + retry_config *yield; + int basic_errno = 0; + int more_errno = 0; + const uschar *s1, *s2; + + if (test_retry_arg >= argc) + { + printf("-brt needs a domain or address argument\n"); + exim_exit(EXIT_FAILURE); + } + s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt"); + s2 = NULL; + + /* If the first argument contains no @ and no . it might be a local user + or it might be a single-component name. Treat as a domain. */ + + if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL) + { + printf("Warning: \"%s\" contains no '@' and no '.' characters. It is " + "being \ntreated as a one-component domain, not as a local part.\n\n", + s1); + } + + /* There may be an optional second domain arg. */ + + if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL) + s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd"); + + /* The final arg is an error name */ + + if (test_retry_arg < argc) + { + const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd"); + uschar *error = + readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno); + if (error != NULL) + { + printf("%s\n", CS error); + return EXIT_FAILURE; + } + + /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a + code > 100 as an error is for matching codes to the decade. Turn them into + a real error code, off the decade. */ + + if (basic_errno == ERRNO_MAIL4XX || + basic_errno == ERRNO_RCPT4XX || + basic_errno == ERRNO_DATA4XX) + { + int code = (more_errno >> 8) & 255; + if (code == 255) + more_errno = (more_errno & 0xffff00ff) | (21 << 8); + else if (code > 100) + more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8); + } + } + + if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno))) + printf("No retry information found\n"); + else + { + more_errno = yield->more_errno; + printf("Retry rule: %s ", yield->pattern); + + if (yield->basic_errno == ERRNO_EXIMQUOTA) + { + printf("quota%s%s ", + (more_errno > 0)? "_" : "", + (more_errno > 0)? readconf_printtime(more_errno) : US""); + } + else if (yield->basic_errno == ECONNREFUSED) + { + printf("refused%s%s ", + (more_errno > 0)? "_" : "", + (more_errno == 'M')? "MX" : + (more_errno == 'A')? "A" : ""); + } + else if (yield->basic_errno == ETIMEDOUT) + { + printf("timeout"); + if ((more_errno & RTEF_CTOUT) != 0) printf("_connect"); + more_errno &= 255; + if (more_errno != 0) printf("_%s", + (more_errno == 'M')? "MX" : "A"); + printf(" "); + } + else if (yield->basic_errno == ERRNO_AUTHFAIL) + printf("auth_failed "); + else printf("* "); + + for (retry_rule * r = yield->rules; r; r = r->next) + { + printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */ + printf(",%s", readconf_printtime(r->p1)); /* amalgamate */ + if (r->rule == 'G') + { + int x = r->p2; + int f = x % 1000; + int d = 100; + printf(",%d.", x/1000); + do + { + printf("%d", f/d); + f %= d; + d /= 10; + } + while (f != 0); + } + printf("; "); + } + + printf("\n"); + } + exim_exit(EXIT_SUCCESS); + } + +/* Handle a request to list one or more configuration options */ +/* If -n was set, we suppress some information */ + +if (list_options) + { + BOOL fail = FALSE; + set_process_info("listing variables"); + if (recipients_arg >= argc) + fail = !readconf_print(US"all", NULL, flag_n); + else for (i = recipients_arg; i < argc; i++) + { + if (i < argc - 1 && + (Ustrcmp(argv[i], "router") == 0 || + Ustrcmp(argv[i], "transport") == 0 || + Ustrcmp(argv[i], "authenticator") == 0 || + Ustrcmp(argv[i], "macro") == 0 || + Ustrcmp(argv[i], "environment") == 0)) + { + fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n); + i++; + } + else + fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n); + } + exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS); + } + +if (list_config) + { + set_process_info("listing config"); + exim_exit(readconf_print(US"config", NULL, flag_n) + ? EXIT_SUCCESS : EXIT_FAILURE); + } + + +/* Initialise subsystems as required. */ + +tcp_init(); + +/* Handle a request to deliver one or more messages that are already on the +queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with +above. MSG_LOAD is handled with -be (which is the only time it applies) below. + +Delivery of specific messages is typically used for a small number when +prodding by hand (when the option forced_delivery will be set) or when +re-execing to regain root privilege. Each message delivery must happen in a +separate process, so we fork a process for each one, and run them sequentially +so that debugging output doesn't get intertwined, and to avoid spawning too +many processes if a long list is given. However, don't fork for the last one; +this saves a process in the common case when Exim is called to deliver just one +message. */ + +if (msg_action_arg > 0 && msg_action != MSG_LOAD) + { + if (prod_requires_admin && !f.admin_user) + { + fprintf(stderr, "exim: Permission denied\n"); + exim_exit(EXIT_FAILURE); + } + set_process_info("delivering specified messages"); + if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE; + for (i = msg_action_arg; i < argc; i++) + { + int status; + pid_t pid; + /*XXX This use of argv[i] for msg_id should really be tainted, but doing + that runs into a later copy into the untainted global message_id[] */ + /*XXX Do we need a length limit check here? */ + if (i == argc - 1) + (void)deliver_message(argv[i], forced_delivery, deliver_give_up); + else if ((pid = exim_fork(US"cmdline-delivery")) == 0) + { + (void)deliver_message(argv[i], forced_delivery, deliver_give_up); + exim_underbar_exit(EXIT_SUCCESS); + } + else if (pid < 0) + { + fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i], + strerror(errno)); + exim_exit(EXIT_FAILURE); + } + else wait(&status); + } + exim_exit(EXIT_SUCCESS); + } + + +/* If only a single queue run is requested, without SMTP listening, we can just +turn into a queue runner, with an optional starting message id. */ + +if (queue_interval == 0 && !f.daemon_listen) + { + DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n", + start_queue_run_id ? US" starting at " : US"", + start_queue_run_id ? start_queue_run_id: US"", + stop_queue_run_id ? US" stopping at " : US"", + stop_queue_run_id ? stop_queue_run_id : US""); + if (*queue_name) + set_process_info("running the '%s' queue (single queue run)", queue_name); + else + set_process_info("running the queue (single queue run)"); + queue_run(start_queue_run_id, stop_queue_run_id, FALSE); + exim_exit(EXIT_SUCCESS); + } + + +/* Find the login name of the real user running this process. This is always +needed when receiving a message, because it is written into the spool file. It +may also be used to construct a from: or a sender: header, and in this case we +need the user's full name as well, so save a copy of it, checked for RFC822 +syntax and munged if necessary, if it hasn't previously been set by the -F +argument. We may try to get the passwd entry more than once, in case NIS or +other delays are in evidence. Save the home directory for use in filter testing +(only). */ + +for (i = 0;;) + { + if ((pw = getpwuid(real_uid)) != NULL) + { + originator_login = string_copy(US pw->pw_name); + originator_home = string_copy(US pw->pw_dir); + + /* If user name has not been set by -F, set it from the passwd entry + unless -f has been used to set the sender address by a trusted user. */ + + if (!originator_name) + { + if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE)) + { + uschar *name = US pw->pw_gecos; + uschar *amp = Ustrchr(name, '&'); + uschar buffer[256]; + + /* Most Unix specify that a '&' character in the gecos field is + replaced by a copy of the login name, and some even specify that + the first character should be upper cased, so that's what we do. */ + + if (amp) + { + int loffset; + string_format(buffer, sizeof(buffer), "%.*s%n%s%s", + (int)(amp - name), name, &loffset, originator_login, amp + 1); + buffer[loffset] = toupper(buffer[loffset]); + name = buffer; + } + + /* If a pattern for matching the gecos field was supplied, apply + it and then expand the name string. */ + + if (gecos_pattern && gecos_name) + { + const pcre2_code *re; + re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */ + + if (regex_match_and_setup(re, name, 0, -1)) + { + uschar *new_name = expand_string(gecos_name); + expand_nmax = -1; + if (new_name) + { + DEBUG(D_receive) debug_printf("user name \"%s\" extracted from " + "gecos field \"%s\"\n", new_name, name); + name = new_name; + } + else DEBUG(D_receive) debug_printf("failed to expand gecos_name string " + "\"%s\": %s\n", gecos_name, expand_string_message); + } + else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match " + "gecos field \"%s\"\n", gecos_pattern, name); + store_free((void *)re); + } + originator_name = string_copy(name); + } + + /* A trusted caller has used -f but not -F */ + + else originator_name = US""; + } + + /* Break the retry loop */ + + break; + } + + if (++i > finduser_retries) break; + sleep(1); + } + +/* If we cannot get a user login, log the incident and give up, unless the +configuration specifies something to use. When running in the test harness, +any setting of unknown_login overrides the actual name. */ + +if (!originator_login || f.running_in_test_harness) + { + if (unknown_login) + { + originator_login = expand_string(unknown_login); + if (!originator_name && unknown_username) + originator_name = expand_string(unknown_username); + if (!originator_name) originator_name = US""; + } + if (!originator_login) + log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d", + (int)real_uid); + } + +/* Ensure that the user name is in a suitable form for use as a "phrase" in an +RFC822 address.*/ + +originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name)); + +/* If a message is created by this call of Exim, the uid/gid of its originator +are those of the caller. These values are overridden if an existing message is +read in from the spool. */ + +originator_uid = real_uid; +originator_gid = real_gid; + +DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n", + (int)originator_uid, (int)originator_gid, originator_login, originator_name); + +/* Run in daemon and/or queue-running mode. The function daemon_go() never +returns. We leave this till here so that the originator_ fields are available +for incoming messages via the daemon. The daemon cannot be run in mua_wrapper +mode. */ + +if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0) + { + if (mua_wrapper) + { + fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n"); + log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when " + "mua_wrapper is set"); + } + +# ifndef DISABLE_TLS + /* This also checks that the library linkage is working and we can call + routines in it, so call even if tls_require_ciphers is unset */ + { +# ifdef MEASURE_TIMING + struct timeval t0; + (void)gettimeofday(&t0, NULL); +# endif + if (!tls_dropprivs_validate_require_cipher(FALSE)) + exit(1); +# ifdef MEASURE_TIMING + report_time_since(&t0, US"validate_ciphers (delta)"); +# endif + } +#endif + + daemon_go(); + } + +/* If the sender ident has not been set (by a trusted caller) set it to +the caller. This will get overwritten below for an inetd call. If a trusted +caller has set it empty, unset it. */ + +if (!sender_ident) sender_ident = originator_login; +else if (!*sender_ident) sender_ident = NULL; + +/* Handle the -brw option, which is for checking out rewriting rules. Cause log +writes (on errors) to go to stderr instead. Can't do this earlier, as want the +originator_* variables set. */ + +if (test_rewrite_arg >= 0) + { + f.really_exim = FALSE; + if (test_rewrite_arg >= argc) + { + printf("-brw needs an address argument\n"); + exim_exit(EXIT_FAILURE); + } + rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw")); + exim_exit(EXIT_SUCCESS); + } + +/* A locally-supplied message is considered to be coming from a local user +unless a trusted caller supplies a sender address with -f, or is passing in the +message via SMTP (inetd invocation or otherwise). */ + +if ( !sender_address && !smtp_input + || !f.trusted_caller && filter_test == FTEST_NONE) + { + f.sender_local = TRUE; + + /* A trusted caller can supply authenticated_sender and authenticated_id + via -oMas and -oMai and if so, they will already be set. Otherwise, force + defaults except when host checking. */ + + if (!authenticated_sender && !host_checking) + authenticated_sender = string_sprintf("%s@%s", originator_login, + qualify_domain_sender); + if (!authenticated_id && !host_checking) + authenticated_id = originator_login; + } + +/* Trusted callers are always permitted to specify the sender address. +Untrusted callers may specify it if it matches untrusted_set_sender, or if what +is specified is the empty address. However, if a trusted caller does not +specify a sender address for SMTP input, we leave sender_address unset. This +causes the MAIL commands to be honoured. */ + +if ( !smtp_input && !sender_address + || !receive_check_set_sender(sender_address)) + { + /* Either the caller is not permitted to set a general sender, or this is + non-SMTP input and the trusted caller has not set a sender. If there is no + sender, or if a sender other than <> is set, override with the originator's + login (which will get qualified below), except when checking things. */ + + if ( !sender_address /* No sender_address set */ + || /* OR */ + (sender_address[0] != 0 && /* Non-empty sender address, AND */ + !checking)) /* Not running tests, including filter tests */ + { + sender_address = originator_login; + f.sender_address_forced = FALSE; + sender_address_domain = 0; + } + } + +/* Remember whether an untrusted caller set the sender address */ + +f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller; + +/* Ensure that the sender address is fully qualified unless it is the empty +address, which indicates an error message, or doesn't exist (root caller, smtp +interface, no -f argument). */ + +if (sender_address && *sender_address && sender_address_domain == 0) + sender_address = string_sprintf("%s@%s", local_part_quote(sender_address), + qualify_domain_sender); + +DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address); + +/* Handle a request to verify a list of addresses, or test them for delivery. +This must follow the setting of the sender address, since routers can be +predicated upon the sender. If no arguments are given, read addresses from +stdin. Set debug_level to at least D_v to get full output for address testing. +*/ + +if (verify_address_mode || f.address_test_mode) + { + int exit_value = 0; + int flags = vopt_qualify; + + if (verify_address_mode) + { + if (!verify_as_sender) flags |= vopt_is_recipient; + DEBUG(D_verify) debug_print_ids(US"Verifying:"); + } + + else + { + flags |= vopt_is_recipient; + debug_selector |= D_v; + debug_file = stderr; + debug_fd = fileno(debug_file); + DEBUG(D_verify) debug_print_ids(US"Address testing:"); + } + + if (recipients_arg < argc) + while (recipients_arg < argc) + { + /* Supplied addresses are tainted since they come from a user */ + uschar * s = string_copy_taint( + exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"), + GET_TAINTED); + while (*s) + { + BOOL finished = FALSE; + uschar *ss = parse_find_address_end(s, FALSE); + if (*ss == ',') *ss = 0; else finished = TRUE; + test_address(s, flags, &exit_value); + s = ss; + if (!finished) + while (*++s == ',' || isspace(*s)) ; + } + } + + else for (;;) + { + uschar * s = get_stdinput(NULL, NULL); + if (!s) break; + test_address(string_copy_taint( + exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"), + GET_TAINTED), + flags, &exit_value); + } + + route_tidyup(); + exim_exit(exit_value); + } + +/* Handle expansion checking. Either expand items on the command line, or read +from stdin if there aren't any. If -Mset was specified, load the message so +that its variables can be used, but restrict this facility to admin users. +Otherwise, if -bem was used, read a message from stdin. */ + +if (expansion_test) + { + dns_init(FALSE, FALSE, FALSE); + if (msg_action_arg > 0 && msg_action == MSG_LOAD) + { + uschar * spoolname; + if (!f.admin_user) + exim_fail("exim: permission denied\n"); + message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id"); + /* Checking the length of the ID is sufficient to validate it. + Get an untainted version so file opens can be done. */ + message_id = string_copy_taint(message_id, GET_UNTAINTED); + + spoolname = string_sprintf("%s-H", message_id); + if ((deliver_datafile = spool_open_datafile(message_id)) < 0) + printf ("Failed to load message datafile %s\n", message_id); + if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK) + printf ("Failed to load message %s\n", message_id); + } + + /* Read a test message from a file. We fudge it up to be on stdin, saving + stdin itself for later reading of expansion strings. */ + + else if (expansion_test_message) + { + int save_stdin = dup(0); + int fd = Uopen(expansion_test_message, O_RDONLY, 0); + if (fd < 0) + exim_fail("exim: failed to open %s: %s\n", expansion_test_message, + strerror(errno)); + (void) dup2(fd, 0); + filter_test = FTEST_USER; /* Fudge to make it look like filter test */ + message_ended = END_NOTENDED; + read_message_body(receive_msg(extract_recipients)); + message_linecount += body_linecount; + (void)dup2(save_stdin, 0); + (void)close(save_stdin); + clearerr(stdin); /* Required by Darwin */ + } + + /* Only admin users may see config-file macros this way */ + + if (!f.admin_user) macros_user = macros = mlast = NULL; + + /* Allow $recipients for this testing */ + + f.enable_dollar_recipients = TRUE; + + /* Expand command line items */ + + if (recipients_arg < argc) + while (recipients_arg < argc) + expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient")); + + /* Read stdin */ + + else + { + char *(*fn_readline)(const char *) = NULL; + void (*fn_addhist)(const char *) = NULL; + uschar * s; + +#ifdef USE_READLINE + void *dlhandle = set_readline(&fn_readline, &fn_addhist); +#endif + + while (s = get_stdinput(fn_readline, fn_addhist)) + expansion_test_line(s); + +#ifdef USE_READLINE + if (dlhandle) dlclose(dlhandle); +#endif + } + + /* The data file will be open after -Mset */ + + if (deliver_datafile >= 0) + { + (void)close(deliver_datafile); + deliver_datafile = -1; + } + + exim_exit(EXIT_SUCCESS); + } + + +/* The active host name is normally the primary host name, but it can be varied +for hosts that want to play several parts at once. We need to ensure that it is +set for host checking, and for receiving messages. */ + +smtp_active_hostname = primary_hostname; +if (raw_active_hostname != NULL) + { + uschar *nah = expand_string(raw_active_hostname); + if (nah == NULL) + { + if (!f.expand_string_forcedfail) + log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" " + "(smtp_active_hostname): %s", raw_active_hostname, + expand_string_message); + } + else if (nah[0] != 0) smtp_active_hostname = nah; + } + +/* Handle host checking: this facility mocks up an incoming SMTP call from a +given IP address so that the blocking and relay configuration can be tested. +Unless a sender_ident was set by -oMt, we discard it (the default is the +caller's login name). An RFC 1413 call is made only if we are running in the +test harness and an incoming interface and both ports are specified, because +there is no TCP/IP call to find the ident for. */ + +if (host_checking) + { + int x[4]; + int size; + + if (!sender_ident_set) + { + sender_ident = NULL; + if (f.running_in_test_harness && sender_host_port + && interface_address && interface_port) + verify_get_ident(1223); /* note hardwired port number */ + } + + /* In case the given address is a non-canonical IPv6 address, canonicalize + it. The code works for both IPv4 and IPv6, as it happens. */ + + size = host_aton(sender_host_address, x); + sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */ + (void)host_nmtoa(size, x, -1, sender_host_address, ':'); + + /* Now set up for testing */ + + host_build_sender_fullhost(); + smtp_input = TRUE; + smtp_in = stdin; + smtp_out = stdout; + f.sender_local = FALSE; + f.sender_host_notsocket = TRUE; + debug_file = stderr; + debug_fd = fileno(debug_file); + fprintf(stdout, "\n**** SMTP testing session as if from host %s\n" + "**** but without any ident (RFC 1413) callback.\n" + "**** This is not for real!\n\n", + sender_host_address); + + memset(sender_host_cache, 0, sizeof(sender_host_cache)); + if (verify_check_host(&hosts_connection_nolog) == OK) + BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection); + log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info()); + + /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails, + because a log line has already been written for all its failure exists + (usually "connection refused: <reason>") and writing another one is + unnecessary clutter. */ + + if (smtp_start_session()) + { + rmark reset_point; + for (; (reset_point = store_mark()); store_reset(reset_point)) + { + if (smtp_setup_msg() <= 0) break; + if (!receive_msg(FALSE)) break; + + return_path = sender_address = NULL; + dnslist_domain = dnslist_matched = NULL; +#ifndef DISABLE_DKIM + dkim_cur_signer = NULL; +#endif + acl_var_m = NULL; + deliver_localpart_orig = NULL; + deliver_domain_orig = NULL; + callout_address = sending_ip_address = NULL; + deliver_localpart_data = deliver_domain_data = + recipient_data = sender_data = NULL; + sender_rate = sender_rate_limit = sender_rate_period = NULL; + } + smtp_log_no_mail(); + } + exim_exit(EXIT_SUCCESS); + } + + +/* Arrange for message reception if recipients or SMTP were specified; +otherwise complain unless a version print (-bV) happened or this is a filter +verification test or info dump. +In the former case, show the configuration file name. */ + +if (recipients_arg >= argc && !extract_recipients && !smtp_input) + { + if (version_printed) + { + if (Ustrchr(config_main_filelist, ':')) + printf("Configuration file search path is %s\n", config_main_filelist); + printf("Configuration file is %s\n", config_main_filename); + return EXIT_SUCCESS; + } + + if (info_flag != CMDINFO_NONE) + { + show_exim_information(info_flag, info_stdout ? stdout : stderr); + return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE; + } + + if (filter_test == FTEST_NONE) + exim_usage(called_as); + } + + +/* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the +standard input into an MUA that submits to a smarthost over TCP/IP. We know +that we are not called from inetd, because that is rejected above. The +following configuration settings are forced here: + + (1) Synchronous delivery (-odi) + (2) Errors to stderr (-oep == -oeq) + (3) No parallel remote delivery + (4) Unprivileged delivery + +We don't force overall queueing options because there are several of them; +instead, queueing is avoided below when mua_wrapper is set. However, we do need +to override any SMTP queueing. */ + +if (mua_wrapper) + { + f.synchronous_delivery = TRUE; + arg_error_handling = ERRORS_STDERR; + remote_max_parallel = 1; + deliver_drop_privilege = TRUE; + f.queue_smtp = FALSE; + queue_smtp_domains = NULL; +#ifdef SUPPORT_I18N + message_utf8_downconvert = -1; /* convert-if-needed */ +#endif + } + + +/* Prepare to accept one or more new messages on the standard input. When a +message has been read, its id is returned in message_id[]. If doing immediate +delivery, we fork a delivery process for each received message, except for the +last one, where we can save a process switch. + +It is only in non-smtp mode that error_handling is allowed to be changed from +its default of ERRORS_SENDER by argument. (Idle thought: are any of the +sendmail error modes other than -oem ever actually used? Later: yes.) */ + +if (!smtp_input) error_handling = arg_error_handling; + +/* If this is an inetd call, ensure that stderr is closed to prevent panic +logging being sent down the socket and make an identd call to get the +sender_ident. */ + +else if (f.is_inetd) + { + (void)fclose(stderr); + exim_nullstd(); /* Re-open to /dev/null */ + verify_get_ident(IDENT_PORT); + host_build_sender_fullhost(); + set_process_info("handling incoming connection from %s via inetd", + sender_fullhost); + } + +/* If the sender host address has been set, build sender_fullhost if it hasn't +already been done (which it will have been for inetd). This caters for the +case when it is forced by -oMa. However, we must flag that it isn't a socket, +so that the test for IP options is skipped for -bs input. */ + +if (sender_host_address && !sender_fullhost) + { + host_build_sender_fullhost(); + set_process_info("handling incoming connection from %s via -oMa", + sender_fullhost); + f.sender_host_notsocket = TRUE; + } + +/* Otherwise, set the sender host as unknown except for inetd calls. This +prevents host checking in the case of -bs not from inetd and also for -bS. */ + +else if (!f.is_inetd) f.sender_host_unknown = TRUE; + +/* If stdout does not exist, then dup stdin to stdout. This can happen +if exim is started from inetd. In this case fd 0 will be set to the socket, +but fd 1 will not be set. This also happens for passed SMTP channels. */ + +if (fstat(1, &statbuf) < 0) (void)dup2(0, 1); + +/* Set up the incoming protocol name and the state of the program. Root is +allowed to force received protocol via the -oMr option above. If we have come +via inetd, the process info has already been set up. We don't set +received_protocol here for smtp input, as it varies according to +batch/HELO/EHLO/AUTH/TLS. */ + +if (smtp_input) + { + if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>", + smtp_batched_input? "batched " : "", + sender_address ? sender_address : originator_login); + } +else + { + int old_pool = store_pool; + store_pool = POOL_PERM; + if (!received_protocol) + received_protocol = string_sprintf("local%s", called_as); + store_pool = old_pool; + set_process_info("accepting a local non-SMTP message from <%s>", + sender_address); + } + +/* Initialize the session_local_queue-only flag (this will be ignored if +mua_wrapper is set) */ + +queue_check_only(); +session_local_queue_only = queue_only; + +/* For non-SMTP and for batched SMTP input, check that there is enough space on +the spool if so configured. On failure, we must not attempt to send an error +message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP +error code is given.) */ + +if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0)) + exim_fail("exim: insufficient disk space\n"); + +/* If this is smtp input of any kind, real or batched, handle the start of the +SMTP session. + +NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails, +because a log line has already been written for all its failure exists +(usually "connection refused: <reason>") and writing another one is +unnecessary clutter. */ + +if (smtp_input) + { + smtp_in = stdin; + smtp_out = stdout; + memset(sender_host_cache, 0, sizeof(sender_host_cache)); + if (verify_check_host(&hosts_connection_nolog) == OK) + BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection); + log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info()); + if (!smtp_start_session()) + { + mac_smtp_fflush(); + exim_exit(EXIT_SUCCESS); + } + } + +/* Otherwise, set up the input size limit here and set no stdin stdio buffer +(we handle buferring so as to have visibility of fill level). */ + +else + { + thismessage_size_limit = expand_string_integer(message_size_limit, TRUE); + if (expand_string_message) + if (thismessage_size_limit == -1) + log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand " + "message_size_limit: %s", expand_string_message); + else + log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for " + "message_size_limit: %s", expand_string_message); + + setvbuf(stdin, NULL, _IONBF, 0); + } + +/* Loop for several messages when reading SMTP input. If we fork any child +processes, we don't want to wait for them unless synchronous delivery is +requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the +same as SIG_DFL, despite the fact that documentation often lists the default as +"ignore". This is a confusing area. This is what I know: + +At least on some systems (e.g. Solaris), just setting SIG_IGN causes child +processes that complete simply to go away without ever becoming defunct. You +can't then wait for them - but we don't want to wait for them in the +non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't +happen for all OS (e.g. *BSD is different). + +But that's not the end of the story. Some (many? all?) systems have the +SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris +has by default, so it seems that the difference is merely one of default +(compare restarting vs non-restarting signals). + +To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not, +it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end +of the loop below. Paranoia rules. + +February 2003: That's *still* not the end of the story. There are now versions +of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a +process then calls waitpid(), a grumble is written to the system log, because +this is logically inconsistent. In other words, it doesn't like the paranoia. +As a consequence of this, the waitpid() below is now excluded if we are sure +that SIG_IGN works. */ + +if (!f.synchronous_delivery) + { +#ifdef SA_NOCLDWAIT + struct sigaction act; + act.sa_handler = SIG_IGN; + sigemptyset(&(act.sa_mask)); + act.sa_flags = SA_NOCLDWAIT; + sigaction(SIGCHLD, &act, NULL); +#else + signal(SIGCHLD, SIG_IGN); +#endif + } + +/* Save the current store pool point, for resetting at the start of +each message, and save the real sender address, if any. */ + +real_sender_address = sender_address; + +/* Loop to receive messages; receive_msg() returns TRUE if there are more +messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel +collapsed). */ + +for (BOOL more = TRUE; more; ) + { + rmark reset_point = store_mark(); + message_id[0] = 0; + + /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP + input and build the recipients list, before calling receive_msg() to read the + message proper. Whatever sender address is given in the SMTP transaction is + often ignored for local senders - we use the actual sender, which is normally + either the underlying user running this process or a -f argument provided by + a trusted caller. It is saved in real_sender_address. The test for whether to + accept the SMTP sender is encapsulated in receive_check_set_sender(). */ + + if (smtp_input) + { + int rc; + if ((rc = smtp_setup_msg()) > 0) + { + if (real_sender_address != NULL && + !receive_check_set_sender(sender_address)) + { + sender_address = raw_sender = real_sender_address; + sender_address_unrewritten = NULL; + } + + /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it + isn't really SMTP, so no other ACL will run until the acl_not_smtp one at + the very end. The result of the ACL is ignored (as for other non-SMTP + messages). It is run for its potential side effects. */ + + if (smtp_batched_input && acl_not_smtp_start != NULL) + { + uschar *user_msg, *log_msg; + f.enable_dollar_recipients = TRUE; + (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start, + &user_msg, &log_msg); + f.enable_dollar_recipients = FALSE; + } + + /* Now get the data for the message */ + + more = receive_msg(extract_recipients); + if (!message_id[0]) + { + cancel_cutthrough_connection(TRUE, US"receive dropped"); + if (more) goto MORELOOP; + smtp_log_no_mail(); /* Log no mail if configured */ + exim_exit(EXIT_FAILURE); + } + } + else + { + cancel_cutthrough_connection(TRUE, US"message setup dropped"); + smtp_log_no_mail(); /* Log no mail if configured */ + exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS); + } + } + + /* In the non-SMTP case, we have all the information from the command + line, but must process it in case it is in the more general RFC822 + format, and in any case, to detect syntax errors. Also, it appears that + the use of comma-separated lists as single arguments is common, so we + had better support them. */ + + else + { + int rcount = 0; + int count = argc - recipients_arg; + uschar **list = argv + recipients_arg; + + /* These options cannot be changed dynamically for non-SMTP messages */ + + f.active_local_sender_retain = local_sender_retain; + f.active_local_from_check = local_from_check; + + /* Save before any rewriting */ + + raw_sender = string_copy(sender_address); + + /* Loop for each argument (supplied by user hence tainted) */ + + for (int i = 0; i < count; i++) + { + int start, end, domain; + uschar * errmess; + /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short. + * We'll still want to cap it to something, just in case. */ + uschar * s = string_copy_taint( + exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"), + GET_TAINTED); + + /* Loop for each comma-separated address */ + + while (*s) + { + BOOL finished = FALSE; + uschar *recipient; + uschar *ss = parse_find_address_end(s, FALSE); + + if (*ss == ',') *ss = 0; else finished = TRUE; + + /* Check max recipients - if -t was used, these aren't recipients */ + + if (recipients_max > 0 && ++rcount > recipients_max && + !extract_recipients) + if (error_handling == ERRORS_STDERR) + { + fprintf(stderr, "exim: too many recipients\n"); + exim_exit(EXIT_FAILURE); + } + else + return + moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)? + errors_sender_rc : EXIT_FAILURE; + +#ifdef SUPPORT_I18N + { + BOOL b = allow_utf8_domains; + allow_utf8_domains = TRUE; +#endif + recipient = + parse_extract_address(s, &errmess, &start, &end, &domain, FALSE); + +#ifdef SUPPORT_I18N + if (recipient) + if (string_is_utf8(recipient)) message_smtputf8 = TRUE; + else allow_utf8_domains = b; + } +#else + ; +#endif + if (domain == 0 && !f.allow_unqualified_recipient) + { + recipient = NULL; + errmess = US"unqualified recipient address not allowed"; + } + + if (!recipient) + if (error_handling == ERRORS_STDERR) + { + fprintf(stderr, "exim: bad recipient address \"%s\": %s\n", + string_printing(list[i]), errmess); + exim_exit(EXIT_FAILURE); + } + else + { + error_block eblock; + eblock.next = NULL; + eblock.text1 = string_printing(list[i]); + eblock.text2 = errmess; + return + moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)? + errors_sender_rc : EXIT_FAILURE; + } + + receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1); + s = ss; + if (!finished) + while (*(++s) != 0 && (*s == ',' || isspace(*s))); + } + } + + /* Show the recipients when debugging */ + + DEBUG(D_receive) + { + if (sender_address) debug_printf("Sender: %s\n", sender_address); + if (recipients_list) + { + debug_printf("Recipients:\n"); + for (int i = 0; i < recipients_count; i++) + debug_printf(" %s\n", recipients_list[i].address); + } + } + + /* Run the acl_not_smtp_start ACL if required. The result of the ACL is + ignored; rejecting here would just add complication, and it can just as + well be done later. Allow $recipients to be visible in the ACL. */ + + if (acl_not_smtp_start) + { + uschar *user_msg, *log_msg; + f.enable_dollar_recipients = TRUE; + (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start, + &user_msg, &log_msg); + f.enable_dollar_recipients = FALSE; + } + + /* Pause for a while waiting for input. If none received in that time, + close the logfile, if we had one open; then if we wait for a long-running + datasource (months, in one use-case) log rotation will not leave us holding + the file copy. */ + + if (!receive_timeout) + if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */ + mainlog_close(); + + /* Read the data for the message. If filter_test is not FTEST_NONE, this + will just read the headers for the message, and not write anything onto the + spool. */ + + message_ended = END_NOTENDED; + more = receive_msg(extract_recipients); + + /* more is always FALSE here (not SMTP message) when reading a message + for real; when reading the headers of a message for filter testing, + it is TRUE if the headers were terminated by '.' and FALSE otherwise. */ + + if (!message_id[0]) exim_exit(EXIT_FAILURE); + } /* Non-SMTP message reception */ + + /* If this is a filter testing run, there are headers in store, but + no message on the spool. Run the filtering code in testing mode, setting + the domain to the qualify domain and the local part to the current user, + unless they have been set by options. The prefix and suffix are left unset + unless specified. The the return path is set to to the sender unless it has + already been set from a return-path header in the message. */ + + if (filter_test != FTEST_NONE) + { + deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient; + deliver_domain_orig = deliver_domain; + deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login; + deliver_localpart_orig = deliver_localpart; + deliver_localpart_prefix = US ftest_prefix; + deliver_localpart_suffix = US ftest_suffix; + deliver_home = originator_home; + + if (!return_path) + { + printf("Return-path copied from sender\n"); + return_path = string_copy(sender_address); + } + else + printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path); + printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address); + + receive_add_recipient( + string_sprintf("%s%s%s@%s", + ftest_prefix ? ftest_prefix : US"", + deliver_localpart, + ftest_suffix ? ftest_suffix : US"", + deliver_domain), -1); + + printf("Recipient = %s\n", recipients_list[0].address); + if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix); + if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix); + + if (chdir("/")) /* Get away from wherever the user is running this from */ + { + DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n"); + exim_exit(EXIT_FAILURE); + } + + /* Now we run either a system filter test, or a user filter test, or both. + In the latter case, headers added by the system filter will persist and be + available to the user filter. We need to copy the filter variables + explicitly. */ + + if (filter_test & FTEST_SYSTEM) + if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more)) + exim_exit(EXIT_FAILURE); + + memcpy(filter_sn, filter_n, sizeof(filter_sn)); + + if (filter_test & FTEST_USER) + if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more)) + exim_exit(EXIT_FAILURE); + + exim_exit(EXIT_SUCCESS); + } + + /* Else act on the result of message reception. We should not get here unless + message_id[0] is non-zero. If queue_only is set, session_local_queue_only + will be TRUE. If it is not, check on the number of messages received in this + connection. */ + + if ( !session_local_queue_only + && smtp_accept_queue_per_connection > 0 + && receive_messagecount > smtp_accept_queue_per_connection) + { + session_local_queue_only = TRUE; + queue_only_reason = 2; + } + + /* Initialize local_queue_only from session_local_queue_only. If it is false, + and queue_only_load is set, check that the load average is below it. If it is + not, set local_queue_only TRUE. If queue_only_load_latch is true (the + default), we put the whole session into queue_only mode. It then remains this + way for any subsequent messages on the same SMTP connection. This is a + deliberate choice; even though the load average may fall, it doesn't seem + right to deliver later messages on the same call when not delivering earlier + ones. However, there are odd cases where this is not wanted, so this can be + changed by setting queue_only_load_latch false. */ + + if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0) + if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load)) + { + queue_only_reason = 3; + if (queue_only_load_latch) session_local_queue_only = TRUE; + } + + /* If running as an MUA wrapper, all queueing options and freezing options + are ignored. */ + + if (mua_wrapper) + local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE; + + /* Log the queueing here, when it will get a message id attached, but + not if queue_only is set (case 0). Case 1 doesn't happen here (too many + connections). */ + + if (local_queue_only) + { + cancel_cutthrough_connection(TRUE, US"no delivery; queueing"); + switch(queue_only_reason) + { + case 2: + log_write(L_delay_delivery, + LOG_MAIN, "no immediate delivery: more than %d messages " + "received in one connection", smtp_accept_queue_per_connection); + break; + + case 3: + log_write(L_delay_delivery, + LOG_MAIN, "no immediate delivery: load average %.2f", + (double)load_average/1000.0); + break; + } + } + + else if (f.queue_only_policy || f.deliver_freeze) + cancel_cutthrough_connection(TRUE, US"no delivery; queueing"); + + /* Else do the delivery unless the ACL or local_scan() called for queue only + or froze the message. Always deliver in a separate process. A fork failure is + not a disaster, as the delivery will eventually happen on a subsequent queue + run. The search cache must be tidied before the fork, as the parent will + do it before exiting. The child will trigger a lookup failure and + thereby defer the delivery if it tries to use (for example) a cached ldap + connection that the parent has called unbind on. */ + + else + { + pid_t pid; + search_tidyup(); + + if ((pid = exim_fork(US"local-accept-delivery")) == 0) + { + int rc; + close_unwanted(); /* Close unwanted file descriptors and TLS */ + exim_nullstd(); /* Ensure std{in,out,err} exist */ + + /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper + mode, deliver_drop_privilege is forced TRUE). */ + + if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged) + { + delivery_re_exec(CEE_EXEC_EXIT); + /* Control does not return here. */ + } + + /* No need to re-exec */ + + rc = deliver_message(message_id, FALSE, FALSE); + search_tidyup(); + exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED + ? EXIT_SUCCESS : EXIT_FAILURE); + } + + if (pid < 0) + { + cancel_cutthrough_connection(TRUE, US"delivery fork failed"); + log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery " + "process: %s", strerror(errno)); + } + else + { + release_cutthrough_connection(US"msg passed for delivery"); + + /* In the parent, wait if synchronous delivery is required. This will + always be the case in MUA wrapper mode. */ + + if (f.synchronous_delivery) + { + int status; + while (wait(&status) != pid); + if ((status & 0x00ff) != 0) + log_write(0, LOG_MAIN|LOG_PANIC, + "process %d crashed with signal %d while delivering %s", + (int)pid, status & 0x00ff, message_id); + if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE); + } + } + } + + /* The loop will repeat if more is TRUE. If we do not know know that the OS + automatically reaps children (see comments above the loop), clear away any + finished subprocesses here, in case there are lots of messages coming in + from the same source. */ + +#ifndef SIG_IGN_WORKS + while (waitpid(-1, NULL, WNOHANG) > 0); +#endif + +MORELOOP: + return_path = sender_address = NULL; + authenticated_sender = NULL; + deliver_localpart_orig = NULL; + deliver_domain_orig = NULL; + deliver_host = deliver_host_address = NULL; + dnslist_domain = dnslist_matched = NULL; +#ifdef WITH_CONTENT_SCAN + malware_name = NULL; +#endif + callout_address = NULL; + sending_ip_address = NULL; + deliver_localpart_data = deliver_domain_data = + recipient_data = sender_data = NULL; + acl_var_m = NULL; + for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL; + + store_reset(reset_point); + } + +exim_exit(EXIT_SUCCESS); /* Never returns */ +return 0; /* To stop compiler warning */ +} + + +/* End of exim.c */ |