5c753d988df91b0f726d63dfcd2e1a330fa2a1d6
[exim.git] / src / src / lookups / spf.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Exim - SPF lookup module using libspf2
6 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7
8 Copyright (c) 2005 Chris Webb, Arachsys Internet Services Ltd
9
10 This program is free software; you can redistribute it and/or
11 modify it under the terms of the GNU General Public License
12 as published by the Free Software Foundation; either version 2
13 of the License, or (at your option) any later version.
14
15 Copyright (c) The Exim Maintainers 2020
16 */
17
18 #include "../exim.h"
19
20 #ifndef SUPPORT_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 #if !defined(HAVE_NS_TYPE) && defined(NS_INADDRSZ)
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 extern SPF_dns_server_t * SPF_dns_exim_new(int);
35
36
37 static void *
38 spf_open(const uschar * filename, uschar ** errmsg)
39 {
40 SPF_dns_server_t * dc;
41 SPF_server_t *spf_server = NULL;
42 int debug = 0;
43
44 DEBUG(D_lookup) debug = 1;
45
46 if ((dc = SPF_dns_exim_new(debug)))
47 if ((dc = SPF_dns_cache_new(dc, NULL, debug, 8)))
48 spf_server = SPF_server_new_dns(dc, debug);
49
50 if (!spf_server)
51 {
52 *errmsg = US"SPF_dns_exim_nnew() failed";
53 return NULL;
54 }
55 return (void *) spf_server;
56 }
57
58
59 static void
60 spf_close(void *handle)
61 {
62 SPF_server_t *spf_server = handle;
63 if (spf_server) SPF_server_free(spf_server);
64 }
65
66 static int
67 spf_find(void * handle, const uschar * filename, const uschar * keystring,
68 int key_len, uschar ** result, uschar ** errmsg, uint * do_cache,
69 const uschar * opts)
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
115 DEBUG(D_lookup) spf_response_debug(spf_response);
116
117 SPF_response_free(spf_response);
118 SPF_request_free(spf_request);
119 return OK;
120 }
121
122
123 /*************************************************
124 * Version reporting entry point *
125 *************************************************/
126
127 /* See local README for interface description. */
128
129 #include "../version.h"
130
131 void
132 spf_version_report(FILE *f)
133 {
134 #ifdef DYNLOOKUP
135 fprintf(f, "Library version: SPF: Exim version %s\n", EXIM_VERSION_STR);
136 #endif
137 }
138
139
140 static lookup_info _lookup_info = {
141 US"spf", /* lookup name */
142 0, /* not absfile, not query style */
143 spf_open, /* open function */
144 NULL, /* no check function */
145 spf_find, /* find function */
146 spf_close, /* close function */
147 NULL, /* no tidy function */
148 NULL, /* no quoting function */
149 spf_version_report /* version reporting */
150 };
151
152 #ifdef DYNLOOKUP
153 #define spf_lookup_module_info _lookup_module_info
154 #endif
155
156 static lookup_info *_lookup_list[] = { &_lookup_info };
157 lookup_module_info spf_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
158
159 #endif /* SUPPORT_SPF */