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Diffstat (limited to 'src/local_scan.h')
| -rw-r--r-- | src/local_scan.h | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/src/local_scan.h b/src/local_scan.h new file mode 100644 index 0000000..c609a27 --- /dev/null +++ b/src/local_scan.h @@ -0,0 +1,239 @@ +/************************************************* +* Exim - an Internet mail transport agent * +*************************************************/ + +/* Copyright (c) The Exim Maintainers 2020 - 2022 */ +/* Copyright (c) University of Cambridge 1995 - 2020 */ +/* See the file NOTICE for conditions of use and distribution. */ + +/* This file is the header that is the only Exim header to be included in the +source for the local_scan.c() function. It contains definitions that are made +available for use in that function, and which are documented. That source +should first #define LOCAL_SCAN + +Not every definition that becomes available to the compiler by the inclusion +of this file is part of the local_scan API. The "Adding a local scan function +to Exim" chapter in the documentation is definitive. + +This API is also used for functions called by the ${dlfunc expansion item. +Source for those should first #define DLFUNC_IMPL and then include this file. +Coders of dlfunc routines should read the notes on tainting at the start of +store.c +*/ + + +/* Some basic types that make some things easier, the Exim configuration +settings, and the store functions. */ + +#include <stdarg.h> +#include <sys/types.h> +#include "config.h" +#include "mytypes.h" +#include "store.h" + + +/* Some people (Marc Merlin et al) are maintaining a patch that allows for +dynamic local_scan() libraries. This code is not yet in Exim proper, but it +helps the maintainers if we keep their ABI version numbers here. This may +mutate into more general support later. The major number is increased when the +ABI is changed in a non backward compatible way. The minor number is increased +each time a new feature is added (in a way that doesn't break backward +compatibility). */ + +#define LOCAL_SCAN_ABI_VERSION_MAJOR 6 +#define LOCAL_SCAN_ABI_VERSION_MINOR 0 +#define LOCAL_SCAN_ABI_VERSION \ + LOCAL_SCAN_ABI_VERSION_MAJOR.LOCAL_SCAN_ABI_VERSION_MINOR + + + +/* The function and its return codes. */ + +extern int local_scan(int, uschar **); + +enum { + LOCAL_SCAN_ACCEPT, /* Accept */ + LOCAL_SCAN_ACCEPT_FREEZE, /* Accept, but freeze */ + LOCAL_SCAN_ACCEPT_QUEUE, /* Accept, but no immediate delivery */ + LOCAL_SCAN_REJECT, /* Permanent rejection */ + LOCAL_SCAN_REJECT_NOLOGHDR, /* Permanent rejection, no log header */ + LOCAL_SCAN_TEMPREJECT, /* Temporary rejection */ + LOCAL_SCAN_TEMPREJECT_NOLOGHDR /* Temporary rejection, no log header */ +}; + + +/* Functions called by ${dlfunc{file}{func}{arg}...} return one of the five +status codes defined immediately below. The function's first argument is either +the result of expansion, or the error message in case of failure. The second +and third arguments are standard argument count and vector, comprising the +{arg} values specified in the expansion item. */ + +typedef int exim_dlfunc_t(uschar **yield, int argc, uschar *argv[]); + + +/* Return codes from the support functions lss_match_xxx(). These are also the +codes that dynamically-loaded ${dlfunc functions must return. */ + +#define OK 0 /* Successful match */ +#define DEFER 1 /* Defer - some problem */ +#define FAIL 2 /* Matching failed */ +#define ERROR 3 /* Internal or config error */ + +/* Extra return code for ${dlfunc functions */ + +#define FAIL_FORCED 4 /* "Forced" failure */ + + +/* Available logging destinations */ + +#define LOG_MAIN 1 /* Write to the main log */ +#define LOG_PANIC 2 /* Write to the panic log */ +#define LOG_REJECT 16 /* Write to the reject log, with headers */ + + +/* Accessible debugging bits */ + +#define D_v 0x00000001 +#define D_local_scan 0x00000002 + + +/* Option types that can be used for local_scan_options. The boolean ones +MUST be last so that they are contiguous with the internal boolean specials. */ + +enum { opt_stringptr, opt_int, opt_octint, opt_mkint, opt_Kint, opt_fixed, + opt_time, opt_bool }; + + +/* The length of message identification strings. This is the id used internally +by exim. The external version for use in Received: strings has a leading 'E' +added to ensure it starts with a letter. */ + +#define MESSAGE_ID_LENGTH 16 + +/* The offset to the start of the data in the data file - this allows for +the name of the data file to be present in the first line. */ + +#define SPOOL_DATA_START_OFFSET (MESSAGE_ID_LENGTH+3) + +/* Structure definitions that are documented as visible in the function. */ + +typedef struct header_line { + struct header_line *next; + int type; + int slen; + uschar *text; +} header_line; + +/* Entries in lists options are in this form. */ + +typedef struct { + const char * name; /* should have been uschar but too late now */ + int type; + union { + void * value; + long offset; + void (* fn)(); + } v; +} optionlist; +#define OPT_OFF(s, field) {.offset = offsetof(s, field)} + +/* Structure for holding information about an envelope address. The errors_to +field is always NULL except for one_time aliases that had errors_to on the +routers that generated them. */ + +typedef struct recipient_item { + uschar *address; /* the recipient address */ + int pno; /* parent number for "one_time" alias, or -1 */ + uschar *errors_to; /* the errors_to address or NULL */ + uschar *orcpt; /* DSN orcpt */ + int dsn_flags; /* DSN flags */ +#ifdef EXPERIMENTAL_BRIGHTMAIL + uschar *bmi_optin; +#endif +} recipient_item; + + +/* Global variables that are documented as visible in the function. */ + +extern unsigned int debug_selector; /* Debugging bits */ + +extern int body_linecount; /* Line count in body */ +extern int body_zerocount; /* Binary zero count in body */ +extern uschar *expand_string_message; /* Error info for failing expansion */ +extern const uschar *headers_charset; /* Charset for RFC 2047 decoding */ +extern header_line *header_last; /* Final header */ +extern header_line *header_list; /* First header */ +extern BOOL host_checking; /* Set when checking a host */ +extern uschar *interface_address; /* Interface for incoming call */ +extern int interface_port; /* Port number for incoming call */ +extern uschar *message_id; /* Internal id of message being handled */ +extern uschar *received_protocol; /* Name of incoming protocol */ +extern int recipients_count; /* Number of recipients */ +extern recipient_item *recipients_list;/* List of recipient addresses */ +extern unsigned char *sender_address; /* Sender address */ +extern uschar *sender_host_address; /* IP address of sender, as chars */ +extern uschar *sender_host_authenticated; /* Name of authentication mechanism */ +extern uschar *sender_host_name; /* Host name from lookup */ +extern int sender_host_port; /* Port number of sender */ +extern BOOL smtp_batched_input; /* TRUE if SMTP batch (no interaction) */ +extern BOOL smtp_input; /* TRUE if input is via SMTP */ + + +/* Functions that are documented as visible in local_scan(). */ + +extern int child_close(pid_t, int); +extern void debug_printf(const char *, ...) PRINTF_FUNCTION(1,2); +extern uschar *expand_string(uschar *); +extern void header_add(int, const char *, ...); +extern void header_add_at_position(BOOL, uschar *, BOOL, int, const char *, ...); +extern void header_remove(int, const uschar *); +extern BOOL header_testname(header_line *, const uschar *, int, BOOL); +extern BOOL header_testname_incomplete(header_line *, const uschar *, int, BOOL); +extern void log_write(unsigned int, int, const char *format, ...) PRINTF_FUNCTION(3,4); +extern int lss_b64decode(uschar *, uschar **); +extern uschar *lss_b64encode(uschar *, int); +extern int lss_match_domain(uschar *, uschar *); +extern int lss_match_local_part(uschar *, uschar *, BOOL); +extern int lss_match_address(uschar *, uschar *, BOOL); +extern int lss_match_host(uschar *, uschar *, uschar *); +extern void receive_add_recipient(uschar *, int); +extern BOOL receive_remove_recipient(uschar *); +extern uschar *rfc2047_decode(uschar *, BOOL, const uschar *, int, int *, + uschar **); +extern int smtp_fflush(void); +extern void smtp_printf(const char *, BOOL, ...) PRINTF_FUNCTION(1,3); +extern void smtp_vprintf(const char *, BOOL, va_list); + +#define string_sprintf(fmt, ...) \ + string_sprintf_trc(fmt, US __FUNCTION__, __LINE__, __VA_ARGS__) +extern uschar *string_sprintf_trc(const char *, const uschar *, unsigned, ...) ALMOST_PRINTF(1,4); + +#define store_get(size, proto_mem) \ + store_get_3((size), (proto_mem), __FUNCTION__, __LINE__) +extern void *store_get_3(int, const void *, const char *, int) ALLOC ALLOC_SIZE(1) WARN_UNUSED_RESULT; +#define store_get_perm(size, proto_mem) \ + store_get_perm_3((size), (proto_mem), __FUNCTION__, __LINE__) +extern void *store_get_perm_3(int, const void *, const char *, int) ALLOC ALLOC_SIZE(1) WARN_UNUSED_RESULT; + + +#if defined(LOCAL_SCAN) || defined(DLFUNC_IMPL) +/* When compiling a local_scan() file we want to rename a published API, so that +we can use an inlined implementation in the compiles of the main Exim files, +with the original name. */ + +# define string_copy(s) string_copy_function(s) +# define string_copyn(s, n) string_copyn_function((s), (n)) +# define string_copy_taint(s, t) string_copy_taint_function((s), (t)) +# define child_open_exim(p) child_open_exim_function((p), US"from local_scan") +# define child_open_exim2(p, s, a) child_open_exim2_function((p), (s), (a), US"from local_scan") +# define child_open(a,e,u,i,o,l) child_open_function((a),(e),(u),(i),(o),(l),US"from local_scan") + +extern uschar * string_copy_function(const uschar *); +extern uschar * string_copyn_function(const uschar *, int n); +extern uschar * string_copy_taint_function(const uschar *, const void * proto_mem); +extern pid_t child_open_exim_function(int *, const uschar *); +extern pid_t child_open_exim2_function(int *, uschar *, uschar *, const uschar *); +extern pid_t child_open_function(uschar **, uschar **, int, int *, int *, BOOL, const uschar *); +#endif + +/* End of local_scan.h */ |