Commit | Line | Data |
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0756eb3c PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
3386088d | 5 | /* Copyright (c) University of Cambridge 1995 - 2015 */ |
0756eb3c PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | #include "../exim.h" | |
9 | #include "lf_functions.h" | |
0756eb3c PH |
10 | |
11 | ||
12 | ||
13 | /* Ancient systems (e.g. SunOS4) don't appear to have T_TXT defined in their | |
14 | header files. */ | |
15 | ||
16 | #ifndef T_TXT | |
17 | #define T_TXT 16 | |
18 | #endif | |
19 | ||
eae0036b PP |
20 | /* Many systems do not have T_SPF. */ |
21 | #ifndef T_SPF | |
22 | #define T_SPF 99 | |
23 | #endif | |
24 | ||
1e06383a TL |
25 | /* New TLSA record for DANE */ |
26 | #ifndef T_TLSA | |
27 | #define T_TLSA 52 | |
28 | #endif | |
29 | ||
0756eb3c PH |
30 | /* Table of recognized DNS record types and their integer values. */ |
31 | ||
1ba28e2b | 32 | static const char *type_names[] = { |
0756eb3c PH |
33 | "a", |
34 | #if HAVE_IPV6 | |
3a796370 | 35 | "a+", |
0756eb3c | 36 | "aaaa", |
0756eb3c PH |
37 | #endif |
38 | "cname", | |
e5a9dba6 | 39 | "csa", |
0756eb3c | 40 | "mx", |
ea3bc19b | 41 | "mxh", |
0756eb3c PH |
42 | "ns", |
43 | "ptr", | |
d2a2c69b | 44 | "soa", |
eae0036b | 45 | "spf", |
0756eb3c | 46 | "srv", |
1e06383a | 47 | "tlsa", |
33397d19 | 48 | "txt", |
8e669ac1 | 49 | "zns" |
33397d19 | 50 | }; |
0756eb3c PH |
51 | |
52 | static int type_values[] = { | |
53 | T_A, | |
54 | #if HAVE_IPV6 | |
66be95e0 | 55 | T_ADDRESSES, /* Private type for AAAA + A */ |
0756eb3c | 56 | T_AAAA, |
0756eb3c PH |
57 | #endif |
58 | T_CNAME, | |
e5a9dba6 | 59 | T_CSA, /* Private type for "Client SMTP Authorization". */ |
0756eb3c | 60 | T_MX, |
ea3bc19b | 61 | T_MXH, /* Private type for "MX hostnames" */ |
0756eb3c PH |
62 | T_NS, |
63 | T_PTR, | |
d2a2c69b | 64 | T_SOA, |
eae0036b | 65 | T_SPF, |
0756eb3c | 66 | T_SRV, |
1e06383a | 67 | T_TLSA, |
33397d19 PH |
68 | T_TXT, |
69 | T_ZNS /* Private type for "zone nameservers" */ | |
70 | }; | |
0756eb3c PH |
71 | |
72 | ||
73 | /************************************************* | |
74 | * Open entry point * | |
75 | *************************************************/ | |
76 | ||
77 | /* See local README for interface description. */ | |
78 | ||
e6d225ae | 79 | static void * |
0756eb3c PH |
80 | dnsdb_open(uschar *filename, uschar **errmsg) |
81 | { | |
82 | filename = filename; /* Keep picky compilers happy */ | |
83 | errmsg = errmsg; /* Ditto */ | |
84 | return (void *)(-1); /* Any non-0 value */ | |
85 | } | |
86 | ||
87 | ||
88 | ||
89 | /************************************************* | |
90 | * Find entry point for dnsdb * | |
91 | *************************************************/ | |
92 | ||
7bb56e1f PH |
93 | /* See local README for interface description. The query in the "keystring" may |
94 | consist of a number of parts. | |
95 | ||
8e669ac1 PH |
96 | (a) If the first significant character is '>' then the next character is the |
97 | separator character that is used when multiple records are found. The default | |
7bb56e1f PH |
98 | separator is newline. |
99 | ||
0d0c6357 NM |
100 | (b) If the next character is ',' then the next character is the separator |
101 | character used for multiple items of text in "TXT" records. Alternatively, | |
102 | if the next character is ';' then these multiple items are concatenated with | |
103 | no separator. With neither of these options specified, only the first item | |
8ee4b30e PP |
104 | is output. Similarly for "SPF" records, but the default for joining multiple |
105 | items in one SPF record is the empty string, for direct concatenation. | |
0d0c6357 | 106 | |
fd7f7910 JH |
107 | (c) Options, all comma-terminated, in any order. Any unrecognised option |
108 | terminates option processing. Recognised options are: | |
109 | ||
110 | - 'defer_FOO': set the defer behaviour to FOO. The possible behaviours are: | |
111 | 'strict', where any defer causes the whole lookup to defer; 'lax', where a defer | |
112 | causes the whole lookup to defer only if none of the DNS queries succeeds; and | |
113 | 'never', where all defers are as if the lookup failed. The default is 'lax'. | |
114 | ||
115 | - 'dnssec_FOO', with 'strict', 'lax' and 'never' (default). The meanings are | |
fd3b6a4a JH |
116 | require, try and don't-try dnssec respectively. |
117 | ||
fd7f7910 JH |
118 | - 'retrans_VAL', set the timeout value. VAL is an Exim time specification |
119 | (eg "5s"). The default is set by the main configuration option 'dns_retrans'. | |
120 | ||
121 | - 'retry_VAL', set the retry count on timeouts. VAL is an integer. The | |
122 | default is set by the main configuration option "dns_retry". | |
123 | ||
124 | (d) If the next sequence of characters is a sequence of letters and digits | |
8e669ac1 | 125 | followed by '=', it is interpreted as the name of the DNS record type. The |
ff4dbb19 | 126 | default is "TXT". |
7bb56e1f | 127 | |
fd7f7910 | 128 | (e) Then there follows list of domain names. This is a generalized Exim list, |
8e669ac1 | 129 | which may start with '<' in order to set a specific separator. The default |
7bb56e1f | 130 | separator, as always, is colon. */ |
0756eb3c | 131 | |
e6d225ae | 132 | static int |
55414b25 | 133 | dnsdb_find(void *handle, uschar *filename, const uschar *keystring, int length, |
14b3c5bc | 134 | uschar **result, uschar **errmsg, uint *do_cache) |
0756eb3c PH |
135 | { |
136 | int rc; | |
137 | int size = 256; | |
138 | int ptr = 0; | |
7bb56e1f | 139 | int sep = 0; |
ff4dbb19 | 140 | int defer_mode = PASS; |
fd3b6a4a | 141 | int dnssec_mode = OK; |
fd7f7910 JH |
142 | int save_retrans = dns_retrans; |
143 | int save_retry = dns_retry; | |
542bc632 | 144 | int type; |
c38d6da9 | 145 | int failrc = FAIL; |
55414b25 JH |
146 | const uschar *outsep = CUS"\n"; |
147 | const uschar *outsep2 = NULL; | |
e5a9dba6 | 148 | uschar *equals, *domain, *found; |
0756eb3c PH |
149 | |
150 | /* Because we're the working in the search pool, we try to reclaim as much | |
151 | store as possible later, so we preallocate the result here */ | |
152 | ||
153 | uschar *yield = store_get(size); | |
154 | ||
155 | dns_record *rr; | |
156 | dns_answer dnsa; | |
157 | dns_scan dnss; | |
158 | ||
159 | handle = handle; /* Keep picky compilers happy */ | |
160 | filename = filename; | |
161 | length = length; | |
162 | do_cache = do_cache; | |
163 | ||
0d0c6357 NM |
164 | /* If the string starts with '>' we change the output separator. |
165 | If it's followed by ';' or ',' we set the TXT output separator. */ | |
0756eb3c | 166 | |
7bb56e1f PH |
167 | while (isspace(*keystring)) keystring++; |
168 | if (*keystring == '>') | |
0756eb3c | 169 | { |
7bb56e1f | 170 | outsep = keystring + 1; |
8e669ac1 | 171 | keystring += 2; |
0d0c6357 NM |
172 | if (*keystring == ',') |
173 | { | |
174 | outsep2 = keystring + 1; | |
175 | keystring += 2; | |
176 | } | |
177 | else if (*keystring == ';') | |
178 | { | |
179 | outsep2 = US""; | |
180 | keystring++; | |
181 | } | |
7bb56e1f | 182 | while (isspace(*keystring)) keystring++; |
8e669ac1 | 183 | } |
7bb56e1f | 184 | |
fd3b6a4a | 185 | /* Check for a modifier keyword. */ |
ff4dbb19 | 186 | |
fd7f7910 | 187 | for (;;) |
ff4dbb19 | 188 | { |
fd3b6a4a | 189 | if (strncmpic(keystring, US"defer_", 6) == 0) |
ff4dbb19 | 190 | { |
ff4dbb19 | 191 | keystring += 6; |
fd3b6a4a | 192 | if (strncmpic(keystring, US"strict", 6) == 0) |
fd7f7910 | 193 | { defer_mode = DEFER; keystring += 6; } |
fd3b6a4a | 194 | else if (strncmpic(keystring, US"lax", 3) == 0) |
fd7f7910 | 195 | { defer_mode = PASS; keystring += 3; } |
fd3b6a4a | 196 | else if (strncmpic(keystring, US"never", 5) == 0) |
fd7f7910 | 197 | { defer_mode = OK; keystring += 5; } |
fd3b6a4a JH |
198 | else |
199 | { | |
200 | *errmsg = US"unsupported dnsdb defer behaviour"; | |
201 | return DEFER; | |
202 | } | |
ff4dbb19 | 203 | } |
fd7f7910 | 204 | else if (strncmpic(keystring, US"dnssec_", 7) == 0) |
ff4dbb19 | 205 | { |
fd3b6a4a JH |
206 | keystring += 7; |
207 | if (strncmpic(keystring, US"strict", 6) == 0) | |
fd7f7910 | 208 | { dnssec_mode = DEFER; keystring += 6; } |
fd3b6a4a | 209 | else if (strncmpic(keystring, US"lax", 3) == 0) |
fd7f7910 JH |
210 | { dnssec_mode = PASS; keystring += 3; } |
211 | else if (strncmpic(keystring, US"never", 5) == 0) | |
212 | { dnssec_mode = OK; keystring += 5; } | |
213 | else | |
fd3b6a4a | 214 | { |
fd7f7910 JH |
215 | *errmsg = US"unsupported dnsdb dnssec behaviour"; |
216 | return DEFER; | |
fd3b6a4a | 217 | } |
fd7f7910 JH |
218 | } |
219 | else if (strncmpic(keystring, US"retrans_", 8) == 0) | |
220 | { | |
221 | int timeout_sec; | |
222 | if ((timeout_sec = readconf_readtime(keystring += 8, ',', FALSE)) <= 0) | |
fd3b6a4a | 223 | { |
fd7f7910 JH |
224 | *errmsg = US"unsupported dnsdb timeout value"; |
225 | return DEFER; | |
fd3b6a4a | 226 | } |
fd7f7910 JH |
227 | dns_retrans = timeout_sec; |
228 | while (*keystring != ',') keystring++; | |
229 | } | |
230 | else if (strncmpic(keystring, US"retry_", 6) == 0) | |
231 | { | |
232 | int retries; | |
fc362fc5 | 233 | if ((retries = (int)strtol(CCS keystring + 6, CSS &keystring, 0)) < 0) |
fd3b6a4a | 234 | { |
fd7f7910 | 235 | *errmsg = US"unsupported dnsdb retry count"; |
fd3b6a4a JH |
236 | return DEFER; |
237 | } | |
fd7f7910 | 238 | dns_retry = retries; |
ff4dbb19 | 239 | } |
fd7f7910 JH |
240 | else |
241 | break; | |
242 | ||
ff4dbb19 PH |
243 | while (isspace(*keystring)) keystring++; |
244 | if (*keystring++ != ',') | |
245 | { | |
fd3b6a4a | 246 | *errmsg = US"dnsdb modifier syntax error"; |
ff4dbb19 PH |
247 | return DEFER; |
248 | } | |
249 | while (isspace(*keystring)) keystring++; | |
250 | } | |
251 | ||
542bc632 PP |
252 | /* Figure out the "type" value if it is not T_TXT. |
253 | If the keystring contains an = this must be preceded by a valid type name. */ | |
7bb56e1f | 254 | |
542bc632 | 255 | type = T_TXT; |
7bb56e1f PH |
256 | if ((equals = Ustrchr(keystring, '=')) != NULL) |
257 | { | |
258 | int i, len; | |
259 | uschar *tend = equals; | |
8e669ac1 PH |
260 | |
261 | while (tend > keystring && isspace(tend[-1])) tend--; | |
262 | len = tend - keystring; | |
263 | ||
0756eb3c PH |
264 | for (i = 0; i < sizeof(type_names)/sizeof(uschar *); i++) |
265 | { | |
266 | if (len == Ustrlen(type_names[i]) && | |
267 | strncmpic(keystring, US type_names[i], len) == 0) | |
268 | { | |
269 | type = type_values[i]; | |
270 | break; | |
271 | } | |
272 | } | |
8e669ac1 | 273 | |
0756eb3c PH |
274 | if (i >= sizeof(type_names)/sizeof(uschar *)) |
275 | { | |
276 | *errmsg = US"unsupported DNS record type"; | |
277 | return DEFER; | |
278 | } | |
8e669ac1 | 279 | |
7bb56e1f PH |
280 | keystring = equals + 1; |
281 | while (isspace(*keystring)) keystring++; | |
0756eb3c | 282 | } |
8e669ac1 | 283 | |
7bb56e1f | 284 | /* Initialize the resolver in case this is the first time it has been used. */ |
0756eb3c | 285 | |
fd3b6a4a | 286 | dns_init(FALSE, FALSE, dnssec_mode != OK); |
0756eb3c | 287 | |
8e669ac1 PH |
288 | /* The remainder of the string must be a list of domains. As long as the lookup |
289 | for at least one of them succeeds, we return success. Failure means that none | |
290 | of them were found. | |
0756eb3c | 291 | |
8e669ac1 PH |
292 | The original implementation did not support a list of domains. Adding the list |
293 | feature is compatible, except in one case: when PTR records are being looked up | |
294 | for a single IPv6 address. Fortunately, we can hack in a compatibility feature | |
295 | here: If the type is PTR and no list separator is specified, and the entire | |
296 | remaining string is valid as an IP address, set an impossible separator so that | |
7bb56e1f | 297 | it is treated as one item. */ |
33397d19 | 298 | |
7bb56e1f | 299 | if (type == T_PTR && keystring[0] != '<' && |
7e66e54d | 300 | string_is_ip_address(keystring, NULL) != 0) |
7bb56e1f | 301 | sep = -1; |
0756eb3c | 302 | |
542bc632 PP |
303 | /* SPF strings should be concatenated without a separator, thus make |
304 | it the default if not defined (see RFC 4408 section 3.1.3). | |
305 | Multiple SPF records are forbidden (section 3.1.2) but are currently | |
be36e572 JH |
306 | not handled specially, thus they are concatenated with \n by default. |
307 | MX priority and value are space-separated by default. | |
308 | SRV and TLSA record parts are space-separated by default. */ | |
542bc632 | 309 | |
be36e572 JH |
310 | if (!outsep2) switch(type) |
311 | { | |
312 | case T_SPF: outsep2 = US""; break; | |
313 | case T_SRV: case T_MX: case T_TLSA: outsep2 = US" "; break; | |
314 | } | |
542bc632 | 315 | |
7bb56e1f | 316 | /* Now scan the list and do a lookup for each item */ |
0756eb3c | 317 | |
fd7f7910 | 318 | while ((domain = string_nextinlist(&keystring, &sep, NULL, 0))) |
8e669ac1 | 319 | { |
7bb56e1f | 320 | uschar rbuffer[256]; |
e5a9dba6 PH |
321 | int searchtype = (type == T_CSA)? T_SRV : /* record type we want */ |
322 | (type == T_MXH)? T_MX : | |
323 | (type == T_ZNS)? T_NS : type; | |
324 | ||
325 | /* If the type is PTR or CSA, we have to construct the relevant magic lookup | |
326 | key if the original is an IP address (some experimental protocols are using | |
327 | PTR records for different purposes where the key string is a host name, and | |
328 | Exim's extended CSA can be keyed by domains or IP addresses). This code for | |
329 | doing the reversal is now in a separate function. */ | |
330 | ||
331 | if ((type == T_PTR || type == T_CSA) && | |
7e66e54d | 332 | string_is_ip_address(domain, NULL) != 0) |
0756eb3c | 333 | { |
7bb56e1f PH |
334 | dns_build_reverse(domain, rbuffer); |
335 | domain = rbuffer; | |
0756eb3c | 336 | } |
8e669ac1 | 337 | |
3a796370 | 338 | do |
c38d6da9 | 339 | { |
3a796370 JH |
340 | DEBUG(D_lookup) debug_printf("dnsdb key: %s\n", domain); |
341 | ||
342 | /* Do the lookup and sort out the result. There are four special types that | |
66be95e0 | 343 | are handled specially: T_CSA, T_ZNS, T_ADDRESSES and T_MXH. |
3a796370 | 344 | The first two are handled in a special lookup function so that the facility |
66be95e0 | 345 | could be used from other parts of the Exim code. T_ADDRESSES is handled by looping |
3a796370 JH |
346 | over the types of A lookup. T_MXH affects only what happens later on in |
347 | this function, but for tidiness it is handled by the "special". If the | |
348 | lookup fails, continue with the next domain. In the case of DEFER, adjust | |
349 | the final "nothing found" result, but carry on to the next domain. */ | |
350 | ||
351 | found = domain; | |
6abc190a | 352 | #if HAVE_IPV6 |
66be95e0 | 353 | if (type == T_ADDRESSES) /* NB cannot happen unless HAVE_IPV6 */ |
3a796370 | 354 | { |
cc00f4af | 355 | if (searchtype == T_ADDRESSES) searchtype = T_AAAA; |
3a796370 | 356 | else if (searchtype == T_AAAA) searchtype = T_A; |
55414b25 | 357 | rc = dns_special_lookup(&dnsa, domain, searchtype, CUSS &found); |
3a796370 JH |
358 | } |
359 | else | |
6abc190a | 360 | #endif |
55414b25 | 361 | rc = dns_special_lookup(&dnsa, domain, type, CUSS &found); |
ea3bc19b | 362 | |
4e0983dc JH |
363 | lookup_dnssec_authenticated = dnssec_mode==OK ? NULL |
364 | : dns_is_secure(&dnsa) ? US"yes" : US"no"; | |
365 | ||
3a796370 | 366 | if (rc == DNS_NOMATCH || rc == DNS_NODATA) continue; |
91f40ccd | 367 | if ( rc != DNS_SUCCEED |
9852336a | 368 | || (dnssec_mode == DEFER && !dns_is_secure(&dnsa)) |
91f40ccd | 369 | ) |
3a796370 | 370 | { |
fd3b6a4a JH |
371 | if (defer_mode == DEFER) |
372 | { | |
fd7f7910 JH |
373 | dns_retrans = save_retrans; |
374 | dns_retry = save_retry; | |
9d9c3746 | 375 | dns_init(FALSE, FALSE, FALSE); /* clr dnssec bit */ |
fd3b6a4a JH |
376 | return DEFER; /* always defer */ |
377 | } | |
3a796370 JH |
378 | if (defer_mode == PASS) failrc = DEFER; /* defer only if all do */ |
379 | continue; /* treat defer as fail */ | |
380 | } | |
fd3b6a4a | 381 | |
8e669ac1 | 382 | |
3a796370 | 383 | /* Search the returned records */ |
8e669ac1 | 384 | |
3a796370 JH |
385 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); |
386 | rr != NULL; | |
387 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
0756eb3c | 388 | { |
3a796370 JH |
389 | if (rr->type != searchtype) continue; |
390 | ||
14b3c5bc JH |
391 | if (*do_cache > rr->ttl) |
392 | *do_cache = rr->ttl; | |
393 | ||
cc00f4af | 394 | if (type == T_A || type == T_AAAA || type == T_ADDRESSES) |
7bb56e1f | 395 | { |
3a796370 | 396 | dns_address *da; |
e1a3f32f | 397 | for (da = dns_address_from_rr(&dnsa, rr); da; da = da->next) |
3a796370 | 398 | { |
c2f669a4 JH |
399 | if (ptr != 0) yield = string_catn(yield, &size, &ptr, outsep, 1); |
400 | yield = string_cat(yield, &size, &ptr, da->address); | |
3a796370 JH |
401 | } |
402 | continue; | |
7bb56e1f | 403 | } |
8e669ac1 | 404 | |
3a796370 JH |
405 | /* Other kinds of record just have one piece of data each, but there may be |
406 | several of them, of course. */ | |
8e669ac1 | 407 | |
c2f669a4 | 408 | if (ptr != 0) yield = string_catn(yield, &size, &ptr, outsep, 1); |
8e669ac1 | 409 | |
3a796370 | 410 | if (type == T_TXT || type == T_SPF) |
80a47a2c | 411 | { |
3a796370 | 412 | if (outsep2 == NULL) |
0d0c6357 | 413 | { |
3a796370 | 414 | /* output only the first item of data */ |
c2f669a4 | 415 | yield = string_catn(yield, &size, &ptr, (uschar *)(rr->data+1), |
3a796370 JH |
416 | (rr->data)[0]); |
417 | } | |
418 | else | |
419 | { | |
420 | /* output all items */ | |
421 | int data_offset = 0; | |
422 | while (data_offset < rr->size) | |
423 | { | |
424 | uschar chunk_len = (rr->data)[data_offset++]; | |
425 | if (outsep2[0] != '\0' && data_offset != 1) | |
c2f669a4 JH |
426 | yield = string_catn(yield, &size, &ptr, outsep2, 1); |
427 | yield = string_catn(yield, &size, &ptr, | |
428 | US ((rr->data)+data_offset), chunk_len); | |
3a796370 JH |
429 | data_offset += chunk_len; |
430 | } | |
0d0c6357 | 431 | } |
80a47a2c | 432 | } |
1e06383a TL |
433 | else if (type == T_TLSA) |
434 | { | |
435 | uint8_t usage, selector, matching_type; | |
436 | uint16_t i, payload_length; | |
437 | uschar s[MAX_TLSA_EXPANDED_SIZE]; | |
438 | uschar * sp = s; | |
d2a2c69b | 439 | uschar * p = US rr->data; |
1e06383a TL |
440 | |
441 | usage = *p++; | |
442 | selector = *p++; | |
443 | matching_type = *p++; | |
444 | /* What's left after removing the first 3 bytes above */ | |
445 | payload_length = rr->size - 3; | |
be36e572 JH |
446 | sp += sprintf(CS s, "%d%c%d%c%d%c", usage, *outsep2, |
447 | selector, *outsep2, matching_type, *outsep2); | |
1e06383a TL |
448 | /* Now append the cert/identifier, one hex char at a time */ |
449 | for (i=0; | |
450 | i < payload_length && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4); | |
451 | i++) | |
1e06383a | 452 | sp += sprintf(CS sp, "%02x", (unsigned char)p[i]); |
d2a2c69b | 453 | |
c2f669a4 | 454 | yield = string_cat(yield, &size, &ptr, s); |
1e06383a | 455 | } |
d2a2c69b | 456 | else /* T_CNAME, T_CSA, T_MX, T_MXH, T_NS, T_PTR, T_SOA, T_SRV */ |
e5a9dba6 | 457 | { |
3a796370 JH |
458 | int priority, weight, port; |
459 | uschar s[264]; | |
d2a2c69b JH |
460 | uschar * p = US rr->data; |
461 | ||
462 | switch (type) | |
463 | { | |
464 | case T_MXH: | |
465 | /* mxh ignores the priority number and includes only the hostnames */ | |
466 | GETSHORT(priority, p); | |
467 | break; | |
468 | ||
469 | case T_MX: | |
470 | GETSHORT(priority, p); | |
471 | sprintf(CS s, "%d%c", priority, *outsep2); | |
c2f669a4 | 472 | yield = string_cat(yield, &size, &ptr, s); |
d2a2c69b JH |
473 | break; |
474 | ||
475 | case T_SRV: | |
476 | GETSHORT(priority, p); | |
477 | GETSHORT(weight, p); | |
478 | GETSHORT(port, p); | |
479 | sprintf(CS s, "%d%c%d%c%d%c", priority, *outsep2, | |
480 | weight, *outsep2, port, *outsep2); | |
c2f669a4 | 481 | yield = string_cat(yield, &size, &ptr, s); |
d2a2c69b JH |
482 | break; |
483 | ||
484 | case T_CSA: | |
485 | /* See acl_verify_csa() for more comments about CSA. */ | |
486 | GETSHORT(priority, p); | |
487 | GETSHORT(weight, p); | |
488 | GETSHORT(port, p); | |
489 | ||
490 | if (priority != 1) continue; /* CSA version must be 1 */ | |
491 | ||
492 | /* If the CSA record we found is not the one we asked for, analyse | |
493 | the subdomain assertions in the port field, else analyse the direct | |
494 | authorization status in the weight field. */ | |
495 | ||
496 | if (Ustrcmp(found, domain) != 0) | |
497 | { | |
498 | if (port & 1) *s = 'X'; /* explicit authorization required */ | |
499 | else *s = '?'; /* no subdomain assertions here */ | |
500 | } | |
501 | else | |
502 | { | |
503 | if (weight < 2) *s = 'N'; /* not authorized */ | |
504 | else if (weight == 2) *s = 'Y'; /* authorized */ | |
505 | else if (weight == 3) *s = '?'; /* unauthorizable */ | |
506 | else continue; /* invalid */ | |
507 | } | |
508 | ||
509 | s[1] = ' '; | |
c2f669a4 | 510 | yield = string_catn(yield, &size, &ptr, s, 2); |
d2a2c69b JH |
511 | break; |
512 | ||
513 | default: | |
514 | break; | |
515 | } | |
e5a9dba6 | 516 | |
3a796370 | 517 | /* GETSHORT() has advanced the pointer to the target domain. */ |
8e669ac1 | 518 | |
3a796370 | 519 | rc = dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, |
d2a2c69b | 520 | (DN_EXPAND_ARG4_TYPE)s, sizeof(s)); |
8e669ac1 | 521 | |
3a796370 JH |
522 | /* If an overlong response was received, the data will have been |
523 | truncated and dn_expand may fail. */ | |
8e669ac1 | 524 | |
3a796370 JH |
525 | if (rc < 0) |
526 | { | |
527 | log_write(0, LOG_MAIN, "host name alias list truncated: type=%s " | |
528 | "domain=%s", dns_text_type(type), domain); | |
529 | break; | |
530 | } | |
c2f669a4 | 531 | else yield = string_cat(yield, &size, &ptr, s); |
d2a2c69b JH |
532 | |
533 | if (type == T_SOA && outsep2 != NULL) | |
534 | { | |
535 | unsigned long serial, refresh, retry, expire, minimum; | |
536 | ||
537 | p += rc; | |
c2f669a4 | 538 | yield = string_catn(yield, &size, &ptr, outsep2, 1); |
d2a2c69b JH |
539 | |
540 | rc = dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
541 | (DN_EXPAND_ARG4_TYPE)s, sizeof(s)); | |
542 | if (rc < 0) | |
543 | { | |
544 | log_write(0, LOG_MAIN, "responsible-mailbox truncated: type=%s " | |
545 | "domain=%s", dns_text_type(type), domain); | |
546 | break; | |
547 | } | |
c2f669a4 | 548 | else yield = string_cat(yield, &size, &ptr, s); |
d2a2c69b JH |
549 | |
550 | p += rc; | |
551 | GETLONG(serial, p); GETLONG(refresh, p); | |
552 | GETLONG(retry, p); GETLONG(expire, p); GETLONG(minimum, p); | |
fc362fc5 | 553 | sprintf(CS s, "%c%lu%c%lu%c%lu%c%lu%c%lu", |
d2a2c69b JH |
554 | *outsep2, serial, *outsep2, refresh, |
555 | *outsep2, retry, *outsep2, expire, *outsep2, minimum); | |
c2f669a4 | 556 | yield = string_cat(yield, &size, &ptr, s); |
d2a2c69b | 557 | } |
7bb56e1f | 558 | } |
3a796370 JH |
559 | } /* Loop for list of returned records */ |
560 | ||
561 | /* Loop for set of A-lookupu types */ | |
66be95e0 | 562 | } while (type == T_ADDRESSES && searchtype != T_A); |
3a796370 JH |
563 | |
564 | } /* Loop for list of domains */ | |
7bb56e1f PH |
565 | |
566 | /* Reclaim unused memory */ | |
0756eb3c | 567 | |
7bb56e1f PH |
568 | store_reset(yield + ptr + 1); |
569 | ||
8e669ac1 | 570 | /* If ptr == 0 we have not found anything. Otherwise, insert the terminating |
7bb56e1f PH |
571 | zero and return the result. */ |
572 | ||
fd7f7910 JH |
573 | dns_retrans = save_retrans; |
574 | dns_retry = save_retry; | |
fd3b6a4a JH |
575 | dns_init(FALSE, FALSE, FALSE); /* clear the dnssec bit for getaddrbyname */ |
576 | ||
c38d6da9 | 577 | if (ptr == 0) return failrc; |
0756eb3c | 578 | yield[ptr] = 0; |
0756eb3c | 579 | *result = yield; |
0756eb3c PH |
580 | return OK; |
581 | } | |
582 | ||
6545de78 PP |
583 | |
584 | ||
585 | /************************************************* | |
586 | * Version reporting entry point * | |
587 | *************************************************/ | |
588 | ||
589 | /* See local README for interface description. */ | |
590 | ||
591 | #include "../version.h" | |
592 | ||
593 | void | |
594 | dnsdb_version_report(FILE *f) | |
595 | { | |
596 | #ifdef DYNLOOKUP | |
597 | fprintf(f, "Library version: DNSDB: Exim version %s\n", EXIM_VERSION_STR); | |
598 | #endif | |
599 | } | |
600 | ||
601 | ||
e6d225ae DW |
602 | static lookup_info _lookup_info = { |
603 | US"dnsdb", /* lookup name */ | |
604 | lookup_querystyle, /* query style */ | |
605 | dnsdb_open, /* open function */ | |
606 | NULL, /* check function */ | |
607 | dnsdb_find, /* find function */ | |
608 | NULL, /* no close function */ | |
609 | NULL, /* no tidy function */ | |
6545de78 PP |
610 | NULL, /* no quoting function */ |
611 | dnsdb_version_report /* version reporting */ | |
e6d225ae DW |
612 | }; |
613 | ||
614 | #ifdef DYNLOOKUP | |
615 | #define dnsdb_lookup_module_info _lookup_module_info | |
616 | #endif | |
617 | ||
618 | static lookup_info *_lookup_list[] = { &_lookup_info }; | |
619 | lookup_module_info dnsdb_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 }; | |
620 | ||
fd3b6a4a JH |
621 | /* vi: aw ai sw=2 |
622 | */ | |
0756eb3c | 623 | /* End of lookups/dnsdb.c */ |