src/src/local_scan.h

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2019 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8 /* This file is the header that is the only Exim header to be included in the
   9 source for the local_scan.c() function. It contains definitions that are made
  10 available for use in that function, and which are documented.  That source
  11 should first #define LOCAL_SCAN
  12
  13 This API is also used for functions called by the ${dlfunc expansion item.
  14 Source for those should first #define DLFUNC_IMPL and then include this file.
  15 Coders of dlfunc routines should read the notes on tainting at the start of
  16 store.c
  17 */
  18
  19
  20 /* Some basic types that make some things easier, the Exim configuration
  21 settings, and the store functions. */
  22
  23 #include <stdarg.h>
  24 #include <sys/types.h>
  25 #include "config.h"
  26 #include "mytypes.h"
  27 #include "store.h"
  28
  29
  30 /* The function and its return codes. */
  31
  32 extern int local_scan(int, uschar **);
  33
  34 enum {
  35   LOCAL_SCAN_ACCEPT,              /* Accept */
  36   LOCAL_SCAN_ACCEPT_FREEZE,       /* Accept, but freeze */
  37   LOCAL_SCAN_ACCEPT_QUEUE,        /* Accept, but no immediate delivery */
  38   LOCAL_SCAN_REJECT,              /* Permanent rejection */
  39   LOCAL_SCAN_REJECT_NOLOGHDR,     /* Permanent rejection, no log header */
  40   LOCAL_SCAN_TEMPREJECT,          /* Temporary rejection */
  41   LOCAL_SCAN_TEMPREJECT_NOLOGHDR  /* Temporary rejection, no log header */
  42 };
  43
  44
  45 /* Functions called by ${dlfunc{file}{func}{arg}...} return one of the five
  46 status codes defined immediately below. The function's first argument is either
  47 the result of expansion, or the error message in case of failure. The second
  48 and third arguments are standard argument count and vector, comprising the
  49 {arg} values specified in the expansion item. */
  50
  51 typedef int exim_dlfunc_t(uschar **yield, int argc, uschar *argv[]);
  52
  53
  54 /* Return codes from the support functions lss_match_xxx(). These are also the
  55 codes that dynamically-loaded ${dlfunc functions must return. */
  56
  57 #define  OK            0          /* Successful match */
  58 #define  DEFER         1          /* Defer - some problem */
  59 #define  FAIL          2          /* Matching failed */
  60 #define  ERROR         3          /* Internal or config error */
  61
  62 /* Extra return code for ${dlfunc functions */
  63
  64 #define  FAIL_FORCED   4          /* "Forced" failure */
  65
  66
  67 /* Available logging destinations */
  68
  69 #define LOG_MAIN        1    /* Write to the main log */
  70 #define LOG_PANIC       2    /* Write to the panic log */
  71 #define LOG_REJECT     16    /* Write to the reject log, with headers */
  72
  73
  74 /* Accessible debugging bits */
  75
  76 #define D_v                          0x00000001
  77 #define D_local_scan                 0x00000002
  78
  79
  80 /* Option types that can be used for local_scan_options. The boolean ones
  81 MUST be last so that they are contiguous with the internal boolean specials. */
  82
  83 enum { opt_stringptr, opt_int, opt_octint, opt_mkint, opt_Kint, opt_fixed,
  84   opt_time, opt_bool };
  85
  86
  87 /* The length of message identification strings. This is the id used internally
  88 by exim. The external version for use in Received: strings has a leading 'E'
  89 added to ensure it starts with a letter. */
  90
  91 #define MESSAGE_ID_LENGTH 16
  92
  93 /* The offset to the start of the data in the data file - this allows for
  94 the name of the data file to be present in the first line. */
  95
  96 #define SPOOL_DATA_START_OFFSET (MESSAGE_ID_LENGTH+3)
  97
  98 /* Some people (Marc Merlin et al) are maintaining a patch that allows for
  99 dynamic local_scan() libraries. This code is not yet in Exim proper, but it
 100 helps the maintainers if we keep their ABI version numbers here. This may
 101 mutate into more general support later. The major number is increased when the
 102 ABI is changed in a non backward compatible way. The minor number is increased
 103 each time a new feature is added (in a way that doesn't break backward
 104 compatibility). */
 105
 106 #define LOCAL_SCAN_ABI_VERSION_MAJOR 3
 107 #define LOCAL_SCAN_ABI_VERSION_MINOR 1
 108 #define LOCAL_SCAN_ABI_VERSION \
 109   LOCAL_SCAN_ABI_VERSION_MAJOR.LOCAL_SCAN_ABI_VERSION_MINOR
 110
 111 /* Structure definitions that are documented as visible in the function. */
 112
 113 typedef struct header_line {
 114   struct header_line *next;
 115   int    type;
 116   int    slen;
 117   uschar *text;
 118 } header_line;
 119
 120 /* Entries in lists options are in this form. */
 121
 122 typedef struct {
 123   const char   *name; /* should have been uschar but too late now */
 124   int           type;
 125   void         *value;
 126 } optionlist;
 127
 128 /* Structure for holding information about an envelope address. The errors_to
 129 field is always NULL except for one_time aliases that had errors_to on the
 130 routers that generated them. */
 131
 132 typedef struct recipient_item {
 133   uschar *address;              /* the recipient address */
 134   int     pno;                  /* parent number for "one_time" alias, or -1 */
 135   uschar *errors_to;            /* the errors_to address or NULL */
 136   uschar *orcpt;                /* DSN orcpt */
 137   int     dsn_flags;            /* DSN flags */
 138 #ifdef EXPERIMENTAL_BRIGHTMAIL
 139   uschar *bmi_optin;
 140 #endif
 141 } recipient_item;
 142
 143
 144 /* Global variables that are documented as visible in the function. */
 145
 146 extern unsigned int debug_selector;    /* Debugging bits */
 147
 148 extern int     body_linecount;         /* Line count in body */
 149 extern int     body_zerocount;         /* Binary zero count in body */
 150 extern uschar *expand_string_message;  /* Error info for failing expansion */
 151 extern uschar *headers_charset;        /* Charset for RFC 2047 decoding */
 152 extern header_line *header_last;       /* Final header */
 153 extern header_line *header_list;       /* First header */
 154 extern BOOL    host_checking;          /* Set when checking a host */
 155 extern uschar *interface_address;      /* Interface for incoming call */
 156 extern int     interface_port;         /* Port number for incoming call */
 157 extern uschar *message_id;             /* Internal id of message being handled */
 158 extern uschar *received_protocol;      /* Name of incoming protocol */
 159 extern int     recipients_count;       /* Number of recipients */
 160 extern recipient_item *recipients_list;/* List of recipient addresses */
 161 extern unsigned char *sender_address;  /* Sender address */
 162 extern uschar *sender_host_address;    /* IP address of sender, as chars */
 163 extern uschar *sender_host_authenticated; /* Name of authentication mechanism */
 164 extern uschar *sender_host_name;       /* Host name from lookup */
 165 extern int     sender_host_port;       /* Port number of sender */
 166 extern BOOL    smtp_batched_input;     /* TRUE if SMTP batch (no interaction) */
 167 extern BOOL    smtp_input;             /* TRUE if input is via SMTP */
 168
 169
 170 /* Functions that are documented as visible in local_scan(). */
 171
 172 extern int     child_close(pid_t, int);
 173 extern pid_t   child_open(uschar **, uschar **, int, int *, int *, BOOL);
 174 extern pid_t   child_open_exim(int *);
 175 extern pid_t   child_open_exim2(int *, uschar *, uschar *);
 176 extern void    debug_printf(const char *, ...) PRINTF_FUNCTION(1,2);
 177 extern uschar *expand_string(uschar *);
 178 extern void    header_add(int, const char *, ...);
 179 extern void    header_add_at_position(BOOL, uschar *, BOOL, int, const char *, ...);
 180 extern void    header_remove(int, const uschar *);
 181 extern BOOL    header_testname(header_line *, const uschar *, int, BOOL);
 182 extern BOOL    header_testname_incomplete(header_line *, const uschar *, int, BOOL);
 183 extern void    log_write(unsigned int, int, const char *format, ...) PRINTF_FUNCTION(3,4);
 184 extern int     lss_b64decode(uschar *, uschar **);
 185 extern uschar *lss_b64encode(uschar *, int);
 186 extern int     lss_match_domain(uschar *, uschar *);
 187 extern int     lss_match_local_part(uschar *, uschar *, BOOL);
 188 extern int     lss_match_address(uschar *, uschar *, BOOL);
 189 extern int     lss_match_host(uschar *, uschar *, uschar *);
 190 extern void    receive_add_recipient(uschar *, int);
 191 extern BOOL    receive_remove_recipient(uschar *);
 192 extern uschar *rfc2047_decode(uschar *, BOOL, uschar *, int, int *, uschar **);
 193 extern int     smtp_fflush(void);
 194 extern void    smtp_printf(const char *, BOOL, ...) PRINTF_FUNCTION(1,3);
 195 extern void    smtp_vprintf(const char *, BOOL, va_list);
 196
 197 #define string_sprintf(fmt, ...) \
 198         string_sprintf_trc(fmt, US __FUNCTION__, __LINE__, __VA_ARGS__)
 199 extern uschar *string_sprintf_trc(const char *, const uschar *, unsigned, ...) ALMOST_PRINTF(1,4);
 200
 201 #define store_get(size, tainted) \
 202         store_get_3(size, tainted, __FUNCTION__, __LINE__)
 203 extern void   *store_get_3(int, BOOL, const char *, int)        ALLOC ALLOC_SIZE(1) WARN_UNUSED_RESULT;
 204 #define store_get_perm(size, tainted) \
 205         store_get_perm_3(size, tainted, __FUNCTION__, __LINE__)
 206 extern void   *store_get_perm_3(int, BOOL, const char *, int)   ALLOC ALLOC_SIZE(1) WARN_UNUSED_RESULT;
 207
 208
 209 #if defined(LOCAL_SCAN) || defined(DLFUNC_IMPL)
 210 /* When compiling a local_scan() file we want to rename a published API, so that
 211 we can use an inlined implementation in the compiles of the main Exim files,
 212 with the original name. */
 213
 214 # define string_copy(s) string_copy_function(s)
 215 # define string_copyn(s, n) string_copyn_function((s), (n))
 216 # define string_copy_taint(s, t) string_copy_taint_function((s), (t))
 217
 218 extern uschar * string_copy_function(const uschar *);
 219 extern uschar * string_copyn_function(const uschar *, int n);
 220 extern uschar * string_copy_taint_function(const uschar *, BOOL tainted);
 221 #endif
 222
 223 /* End of local_scan.h */