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) { dummy(x-1); }
  22 #else
  23
  24 #include "lf_functions.h"
  25 #ifndef HAVE_NS_TYPE
  26 #define HAVE_NS_TYPE
  27 #endif
  28 #include <spf2/spf.h>
  29 #include <spf2/spf_dns_resolv.h>
  30 #include <spf2/spf_dns_cache.h>
  31
  32 static void *spf_open(uschar *filename, uschar **errmsg) {
  33   SPF_server_t *spf_server = NULL;
  34   spf_server = SPF_server_new(SPF_DNS_CACHE, 0);
  35   if (spf_server == NULL) {
  36     *errmsg = US"SPF_server_new() failed";
  37     return NULL;
  38   }
  39   return (void *) spf_server;
  40 }
  41
  42 static void spf_close(void *handle) {
  43   SPF_server_t *spf_server = handle;
  44   if (spf_server) SPF_server_free(spf_server);
  45 }
  46
  47 static int spf_find(void *handle, uschar *filename, uschar *keystring, int key_len,
  48              uschar **result, uschar **errmsg, BOOL *do_cache) {
  49   SPF_server_t *spf_server = handle;
  50   SPF_request_t *spf_request = NULL;
  51   SPF_response_t *spf_response = NULL;
  52
  53   spf_request = SPF_request_new(spf_server);
  54   if (spf_request == NULL) {
  55     *errmsg = US"SPF_request_new() failed";
  56     return FAIL;
  57   }
  58
  59   if (SPF_request_set_ipv4_str(spf_request, CS filename)) {
  60     *errmsg = string_sprintf("invalid IP address '%s'", filename);
  61     return FAIL;
  62   }
  63   if (SPF_request_set_env_from(spf_request, CS keystring)) {
  64     *errmsg = string_sprintf("invalid envelope from address '%s'", keystring);
  65     return FAIL;
  66   }
  67
  68   SPF_request_query_mailfrom(spf_request, &spf_response);
  69   *result = string_copy(US SPF_strresult(SPF_response_result(spf_response)));
  70   SPF_response_free(spf_response);
  71   SPF_request_free(spf_request);
  72   return OK;
  73 }
  74
  75
  76 /*************************************************
  77 *         Version reporting entry point          *
  78 *************************************************/
  79
  80 /* See local README for interface description. */
  81
  82 #include "../version.h"
  83
  84 void
  85 spf_version_report(FILE *f)
  86 {
  87 #ifdef DYNLOOKUP
  88 fprintf(f, "Library version: SPF: Exim version %s\n", EXIM_VERSION_STR);
  89 #endif
  90 }
  91
  92
  93 static lookup_info _lookup_info = {
  94   US"spf",                       /* lookup name */
  95   0,                             /* not absfile, not query style */
  96   spf_open,                      /* open function */
  97   NULL,                          /* no check function */
  98   spf_find,                      /* find function */
  99   spf_close,                     /* close function */
 100   NULL,                          /* no tidy function */
 101   NULL,                          /* no quoting function */
 102   spf_version_report             /* version reporting */
 103 };
 104
 105 #ifdef DYNLOOKUP
 106 #define spf_lookup_module_info _lookup_module_info
 107 #endif
 108
 109 static lookup_info *_lookup_list[] = { &_lookup_info };
 110 lookup_module_info spf_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
 111
 112 #endif /* EXPERIMENTAL_SPF */