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 EXPERIMENTAL_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 #ifndef HAVE_NS_TYPE
  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 static void *
  36 spf_open(uschar *filename, uschar **errmsg)
  37 {
  38   SPF_server_t *spf_server = NULL;
  39   spf_server = SPF_server_new(SPF_DNS_CACHE, 0);
  40   if (spf_server == NULL) {
  41     *errmsg = US"SPF_server_new() failed";
  42     return NULL;
  43   }
  44   return (void *) spf_server;
  45 }
  46
  47 static void
  48 spf_close(void *handle)
  49 {
  50   SPF_server_t *spf_server = handle;
  51   if (spf_server) SPF_server_free(spf_server);
  52 }
  53
  54 static int
  55 spf_find(void *handle, uschar *filename, const uschar *keystring, int key_len,
  56              uschar **result, uschar **errmsg, uint *do_cache)
  57 {
  58   SPF_server_t *spf_server = handle;
  59   SPF_request_t *spf_request = NULL;
  60   SPF_response_t *spf_response = NULL;
  61
  62   spf_request = SPF_request_new(spf_server);
  63   if (spf_request == NULL) {
  64     *errmsg = US"SPF_request_new() failed";
  65     return FAIL;
  66   }
  67
  68   if (SPF_request_set_ipv4_str(spf_request, CS filename)) {
  69     *errmsg = string_sprintf("invalid IP address '%s'", filename);
  70     return FAIL;
  71   }
  72   if (SPF_request_set_env_from(spf_request, CS keystring)) {
  73     *errmsg = string_sprintf("invalid envelope from address '%s'", keystring);
  74     return FAIL;
  75   }
  76
  77   SPF_request_query_mailfrom(spf_request, &spf_response);
  78   *result = string_copy(US SPF_strresult(SPF_response_result(spf_response)));
  79   SPF_response_free(spf_response);
  80   SPF_request_free(spf_request);
  81   return OK;
  82 }
  83
  84
  85 /*************************************************
  86 *         Version reporting entry point          *
  87 *************************************************/
  88
  89 /* See local README for interface description. */
  90
  91 #include "../version.h"
  92
  93 void
  94 spf_version_report(FILE *f)
  95 {
  96 #ifdef DYNLOOKUP
  97 fprintf(f, "Library version: SPF: Exim version %s\n", EXIM_VERSION_STR);
  98 #endif
  99 }
 100
 101
 102 static lookup_info _lookup_info = {
 103   US"spf",                       /* lookup name */
 104   0,                             /* not absfile, not query style */
 105   spf_open,                      /* open function */
 106   NULL,                          /* no check function */
 107   spf_find,                      /* find function */
 108   spf_close,                     /* close function */
 109   NULL,                          /* no tidy function */
 110   NULL,                          /* no quoting function */
 111   spf_version_report             /* version reporting */
 112 };
 113
 114 #ifdef DYNLOOKUP
 115 #define spf_lookup_module_info _lookup_module_info
 116 #endif
 117
 118 static lookup_info *_lookup_list[] = { &_lookup_info };
 119 lookup_module_info spf_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
 120
 121 #endif /* EXPERIMENTAL_SPF */