From e90fcc54809db2591dc083f43ef54c6ec8c60847 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 18:16:13 +0200 Subject: Adding upstream version 4.96. Signed-off-by: Daniel Baumann --- src/exim.c | 6097 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 6097 insertions(+) create mode 100644 src/exim.c (limited to 'src/exim.c') 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 +#endif + +#ifdef USE_GNUTLS +# include +# if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP) +# define DISABLE_OCSP +# endif +#endif + +#ifndef _TIME_H +# include +#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(" ", strerror(save_errno)); + else debug_printf(" "); + 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"", 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: \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, "<<>>") == 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 : 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 : set timeout for non-SMTP acceptance + -os : 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 : 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"), + GET_TAINTED); + else + { + (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p:"); + 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]... 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"); + queue_name = string_copyn(argrest, i); + argrest += i; + if (*argrest == '/') argrest++; + } + + /* -q[f][f][l][G]: 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/]: 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