src/src/lookups/spf.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /*
   6  * Exim - SPF lookup module using libspf2
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  * Copyright (c) 2005 Chris Webb, Arachsys Internet Services Ltd
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  */
  17
  18 #include "../exim.h"
  19
  20 #ifndef EXPERIMENTAL_SPF
  21 static void dummy(int x);
  22 static void dummy2(int x) { dummy(x-1); }
  23 static void dummy(int x) { dummy2(x-1); }
  24 #else
  25
  26 #include "lf_functions.h"
  27 #ifndef HAVE_NS_TYPE
  28 #define HAVE_NS_TYPE
  29 #endif
  30 #include <spf2/spf.h>
  31 #include <spf2/spf_dns_resolv.h>
  32 #include <spf2/spf_dns_cache.h>
  33
  34 static void *
  35 spf_open(uschar *filename, uschar **errmsg)
  36 {
  37   SPF_server_t *spf_server = NULL;
  38   spf_server = SPF_server_new(SPF_DNS_CACHE, 0);
  39   if (spf_server == NULL) {
  40     *errmsg = US"SPF_server_new() failed";
  41     return NULL;
  42   }
  43   return (void *) spf_server;
  44 }
  45
  46 static void
  47 spf_close(void *handle)
  48 {
  49   SPF_server_t *spf_server = handle;
  50   if (spf_server) SPF_server_free(spf_server);
  51 }
  52
  53 static int
  54 spf_find(void *handle, uschar *filename, const uschar *keystring, int key_len,
  55              uschar **result, uschar **errmsg, uint *do_cache)
  56 {
  57   SPF_server_t *spf_server = handle;
  58   SPF_request_t *spf_request = NULL;
  59   SPF_response_t *spf_response = NULL;
  60
  61   spf_request = SPF_request_new(spf_server);
  62   if (spf_request == NULL) {
  63     *errmsg = US"SPF_request_new() failed";
  64     return FAIL;
  65   }
  66
  67   if (SPF_request_set_ipv4_str(spf_request, CS filename)) {
  68     *errmsg = string_sprintf("invalid IP address '%s'", filename);
  69     return FAIL;
  70   }
  71   if (SPF_request_set_env_from(spf_request, CS keystring)) {
  72     *errmsg = string_sprintf("invalid envelope from address '%s'", keystring);
  73     return FAIL;
  74   }
  75
  76   SPF_request_query_mailfrom(spf_request, &spf_response);
  77   *result = string_copy(US SPF_strresult(SPF_response_result(spf_response)));
  78   SPF_response_free(spf_response);
  79   SPF_request_free(spf_request);
  80   return OK;
  81 }
  82
  83
  84 /*************************************************
  85 *         Version reporting entry point          *
  86 *************************************************/
  87
  88 /* See local README for interface description. */
  89
  90 #include "../version.h"
  91
  92 void
  93 spf_version_report(FILE *f)
  94 {
  95 #ifdef DYNLOOKUP
  96 fprintf(f, "Library version: SPF: Exim version %s\n", EXIM_VERSION_STR);
  97 #endif
  98 }
  99
 100
 101 static lookup_info _lookup_info = {
 102   US"spf",                       /* lookup name */
 103   0,                             /* not absfile, not query style */
 104   spf_open,                      /* open function */
 105   NULL,                          /* no check function */
 106   spf_find,                      /* find function */
 107   spf_close,                     /* close function */
 108   NULL,                          /* no tidy function */
 109   NULL,                          /* no quoting function */
 110   spf_version_report             /* version reporting */
 111 };
 112
 113 #ifdef DYNLOOKUP
 114 #define spf_lookup_module_info _lookup_module_info
 115 #endif
 116
 117 static lookup_info *_lookup_list[] = { &_lookup_info };
 118 lookup_module_info spf_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
 119
 120 #endif /* EXPERIMENTAL_SPF */