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 *spf_open(uschar *filename, uschar **errmsg) {
  35   SPF_server_t *spf_server = NULL;
  36   spf_server = SPF_server_new(SPF_DNS_CACHE, 0);
  37   if (spf_server == NULL) {
  38     *errmsg = US"SPF_server_new() failed";
  39     return NULL;
  40   }
  41   return (void *) spf_server;
  42 }
  43
  44 static void spf_close(void *handle) {
  45   SPF_server_t *spf_server = handle;
  46   if (spf_server) SPF_server_free(spf_server);
  47 }
  48
  49 static int spf_find(void *handle, uschar *filename, uschar *keystring, int key_len,
  50              uschar **result, uschar **errmsg, BOOL *do_cache) {
  51   SPF_server_t *spf_server = handle;
  52   SPF_request_t *spf_request = NULL;
  53   SPF_response_t *spf_response = NULL;
  54
  55   spf_request = SPF_request_new(spf_server);
  56   if (spf_request == NULL) {
  57     *errmsg = US"SPF_request_new() failed";
  58     return FAIL;
  59   }
  60
  61   if (SPF_request_set_ipv4_str(spf_request, CS filename)) {
  62     *errmsg = string_sprintf("invalid IP address '%s'", filename);
  63     return FAIL;
  64   }
  65   if (SPF_request_set_env_from(spf_request, CS keystring)) {
  66     *errmsg = string_sprintf("invalid envelope from address '%s'", keystring);
  67     return FAIL;
  68   }
  69
  70   SPF_request_query_mailfrom(spf_request, &spf_response);
  71   *result = string_copy(US SPF_strresult(SPF_response_result(spf_response)));
  72   SPF_response_free(spf_response);
  73   SPF_request_free(spf_request);
  74   return OK;
  75 }
  76
  77
  78 /*************************************************
  79 *         Version reporting entry point          *
  80 *************************************************/
  81
  82 /* See local README for interface description. */
  83
  84 #include "../version.h"
  85
  86 void
  87 spf_version_report(FILE *f)
  88 {
  89 #ifdef DYNLOOKUP
  90 fprintf(f, "Library version: SPF: Exim version %s\n", EXIM_VERSION_STR);
  91 #endif
  92 }
  93
  94
  95 static lookup_info _lookup_info = {
  96   US"spf",                       /* lookup name */
  97   0,                             /* not absfile, not query style */
  98   spf_open,                      /* open function */
  99   NULL,                          /* no check function */
 100   spf_find,                      /* find function */
 101   spf_close,                     /* close function */
 102   NULL,                          /* no tidy function */
 103   NULL,                          /* no quoting function */
 104   spf_version_report             /* version reporting */
 105 };
 106
 107 #ifdef DYNLOOKUP
 108 #define spf_lookup_module_info _lookup_module_info
 109 #endif
 110
 111 static lookup_info *_lookup_list[] = { &_lookup_info };
 112 lookup_module_info spf_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
 113
 114 #endif /* EXPERIMENTAL_SPF */