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  * Copyright (c) The Exim Maintainers 2016
  17  */
  18
  19 #include "../exim.h"
  20
  21 #ifndef SUPPORT_SPF
  22 static void dummy(int x);
  23 static void dummy2(int x) { dummy(x-1); }
  24 static void dummy(int x) { dummy2(x-1); }
  25 #else
  26
  27 #include "lf_functions.h"
  28 #if !defined(HAVE_NS_TYPE) && defined(NS_INADDRSZ)
  29 # define HAVE_NS_TYPE
  30 #endif
  31 #include <spf2/spf.h>
  32 #include <spf2/spf_dns_resolv.h>
  33 #include <spf2/spf_dns_cache.h>
  34
  35 extern SPF_dns_server_t * SPF_dns_exim_new(int);
  36
  37
  38 static void *
  39 spf_open(uschar *filename, uschar **errmsg)
  40 {
  41 SPF_dns_server_t * dc;
  42 SPF_server_t *spf_server = NULL;
  43 int debug = 0;
  44
  45 DEBUG(D_lookup) debug = 1;
  46
  47 if ((dc = SPF_dns_exim_new(debug)))
  48   if ((dc = SPF_dns_cache_new(dc, NULL, debug, 8)))
  49     spf_server = SPF_server_new_dns(dc, debug);
  50
  51 if (!spf_server)
  52   {
  53   *errmsg = US"SPF_dns_exim_nnew() failed";
  54   return NULL;
  55   }
  56 return (void *) spf_server;
  57 }
  58
  59
  60 static void
  61 spf_close(void *handle)
  62 {
  63 SPF_server_t *spf_server = handle;
  64 if (spf_server) SPF_server_free(spf_server);
  65 }
  66
  67 static int
  68 spf_find(void *handle, uschar *filename, const uschar *keystring, int key_len,
  69              uschar **result, uschar **errmsg, uint *do_cache)
  70 {
  71 SPF_server_t *spf_server = handle;
  72 SPF_request_t *spf_request;
  73 SPF_response_t *spf_response = NULL;
  74
  75 if (!(spf_request = SPF_request_new(spf_server)))
  76   {
  77   *errmsg = US"SPF_request_new() failed";
  78   return FAIL;
  79   }
  80
  81 #if HAVE_IPV6
  82 switch (string_is_ip_address(filename, NULL))
  83 #else
  84 switch (4)
  85 #endif
  86   {
  87   case 4:
  88     if (!SPF_request_set_ipv4_str(spf_request, CS filename))
  89       break;
  90     *errmsg = string_sprintf("invalid IPv4 address '%s'", filename);
  91     return FAIL;
  92 #if HAVE_IPV6
  93
  94   case 6:
  95     if (!SPF_request_set_ipv6_str(spf_request, CS filename))
  96       break;
  97     *errmsg = string_sprintf("invalid IPv6 address '%s'", filename);
  98     return FAIL;
  99
 100   default:
 101     *errmsg = string_sprintf("invalid IP address '%s'", filename);
 102     return FAIL;
 103 #endif
 104   }
 105
 106 if (SPF_request_set_env_from(spf_request, CS keystring))
 107     {
 108   *errmsg = string_sprintf("invalid envelope from address '%s'", keystring);
 109   return FAIL;
 110 }
 111
 112 SPF_request_query_mailfrom(spf_request, &spf_response);
 113 *result = string_copy(US SPF_strresult(SPF_response_result(spf_response)));
 114 SPF_response_free(spf_response);
 115 SPF_request_free(spf_request);
 116 return OK;
 117 }
 118
 119
 120 /*************************************************
 121 *         Version reporting entry point          *
 122 *************************************************/
 123
 124 /* See local README for interface description. */
 125
 126 #include "../version.h"
 127
 128 void
 129 spf_version_report(FILE *f)
 130 {
 131 #ifdef DYNLOOKUP
 132 fprintf(f, "Library version: SPF: Exim version %s\n", EXIM_VERSION_STR);
 133 #endif
 134 }
 135
 136
 137 static lookup_info _lookup_info = {
 138   US"spf",                       /* lookup name */
 139   0,                             /* not absfile, not query style */
 140   spf_open,                      /* open function */
 141   NULL,                          /* no check function */
 142   spf_find,                      /* find function */
 143   spf_close,                     /* close function */
 144   NULL,                          /* no tidy function */
 145   NULL,                          /* no quoting function */
 146   spf_version_report             /* version reporting */
 147 };
 148
 149 #ifdef DYNLOOKUP
 150 #define spf_lookup_module_info _lookup_module_info
 151 #endif
 152
 153 static lookup_info *_lookup_list[] = { &_lookup_info };
 154 lookup_module_info spf_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
 155
 156 #endif /* SUPPORT_SPF */