Commit | Line | Data |
---|---|---|
0756eb3c PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
5a66c31b | 5 | /* Copyright (c) University of Cambridge 1995 - 2014 */ |
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 PH |
36 | "aaaa", |
37 | #ifdef SUPPORT_A6 | |
38 | "a6", | |
39 | #endif | |
40 | #endif | |
41 | "cname", | |
e5a9dba6 | 42 | "csa", |
0756eb3c | 43 | "mx", |
ea3bc19b | 44 | "mxh", |
0756eb3c PH |
45 | "ns", |
46 | "ptr", | |
eae0036b | 47 | "spf", |
0756eb3c | 48 | "srv", |
1e06383a | 49 | "tlsa", |
33397d19 | 50 | "txt", |
8e669ac1 | 51 | "zns" |
33397d19 | 52 | }; |
0756eb3c PH |
53 | |
54 | static int type_values[] = { | |
55 | T_A, | |
56 | #if HAVE_IPV6 | |
66be95e0 | 57 | T_ADDRESSES, /* Private type for AAAA + A */ |
0756eb3c PH |
58 | T_AAAA, |
59 | #ifdef SUPPORT_A6 | |
60 | T_A6, | |
61 | #endif | |
62 | #endif | |
63 | T_CNAME, | |
e5a9dba6 | 64 | T_CSA, /* Private type for "Client SMTP Authorization". */ |
0756eb3c | 65 | T_MX, |
ea3bc19b | 66 | T_MXH, /* Private type for "MX hostnames" */ |
0756eb3c PH |
67 | T_NS, |
68 | T_PTR, | |
eae0036b | 69 | T_SPF, |
0756eb3c | 70 | T_SRV, |
1e06383a | 71 | T_TLSA, |
33397d19 PH |
72 | T_TXT, |
73 | T_ZNS /* Private type for "zone nameservers" */ | |
74 | }; | |
0756eb3c PH |
75 | |
76 | ||
77 | /************************************************* | |
78 | * Open entry point * | |
79 | *************************************************/ | |
80 | ||
81 | /* See local README for interface description. */ | |
82 | ||
e6d225ae | 83 | static void * |
0756eb3c PH |
84 | dnsdb_open(uschar *filename, uschar **errmsg) |
85 | { | |
86 | filename = filename; /* Keep picky compilers happy */ | |
87 | errmsg = errmsg; /* Ditto */ | |
88 | return (void *)(-1); /* Any non-0 value */ | |
89 | } | |
90 | ||
91 | ||
92 | ||
93 | /************************************************* | |
94 | * Find entry point for dnsdb * | |
95 | *************************************************/ | |
96 | ||
7bb56e1f PH |
97 | /* See local README for interface description. The query in the "keystring" may |
98 | consist of a number of parts. | |
99 | ||
8e669ac1 PH |
100 | (a) If the first significant character is '>' then the next character is the |
101 | separator character that is used when multiple records are found. The default | |
7bb56e1f PH |
102 | separator is newline. |
103 | ||
0d0c6357 NM |
104 | (b) If the next character is ',' then the next character is the separator |
105 | character used for multiple items of text in "TXT" records. Alternatively, | |
106 | if the next character is ';' then these multiple items are concatenated with | |
107 | no separator. With neither of these options specified, only the first item | |
8ee4b30e PP |
108 | is output. Similarly for "SPF" records, but the default for joining multiple |
109 | items in one SPF record is the empty string, for direct concatenation. | |
0d0c6357 NM |
110 | |
111 | (c) If the next sequence of characters is 'defer_FOO' followed by a comma, | |
ff4dbb19 PH |
112 | the defer behaviour is set to FOO. The possible behaviours are: 'strict', where |
113 | any defer causes the whole lookup to defer; 'lax', where a defer causes the | |
114 | whole lookup to defer only if none of the DNS queries succeeds; and 'never', | |
115 | where all defers are as if the lookup failed. The default is 'lax'. | |
116 | ||
fd3b6a4a JH |
117 | (d) Another optional comma-sep field: 'dnssec_FOO', with 'strict', 'lax' |
118 | and 'never' (default); can appear before or after (c). The meanings are | |
119 | require, try and don't-try dnssec respectively. | |
120 | ||
121 | (e) If the next sequence of characters is a sequence of letters and digits | |
8e669ac1 | 122 | followed by '=', it is interpreted as the name of the DNS record type. The |
ff4dbb19 | 123 | default is "TXT". |
7bb56e1f | 124 | |
fd3b6a4a | 125 | (f) Then there follows list of domain names. This is a generalized Exim list, |
8e669ac1 | 126 | which may start with '<' in order to set a specific separator. The default |
7bb56e1f | 127 | separator, as always, is colon. */ |
0756eb3c | 128 | |
e6d225ae | 129 | static int |
55414b25 | 130 | dnsdb_find(void *handle, uschar *filename, const uschar *keystring, int length, |
0756eb3c PH |
131 | uschar **result, uschar **errmsg, BOOL *do_cache) |
132 | { | |
133 | int rc; | |
134 | int size = 256; | |
135 | int ptr = 0; | |
7bb56e1f | 136 | int sep = 0; |
ff4dbb19 | 137 | int defer_mode = PASS; |
fd3b6a4a | 138 | int dnssec_mode = OK; |
542bc632 | 139 | int type; |
c38d6da9 | 140 | int failrc = FAIL; |
55414b25 JH |
141 | const uschar *outsep = CUS"\n"; |
142 | const uschar *outsep2 = NULL; | |
e5a9dba6 | 143 | uschar *equals, *domain, *found; |
0756eb3c PH |
144 | uschar buffer[256]; |
145 | ||
146 | /* Because we're the working in the search pool, we try to reclaim as much | |
147 | store as possible later, so we preallocate the result here */ | |
148 | ||
149 | uschar *yield = store_get(size); | |
150 | ||
151 | dns_record *rr; | |
152 | dns_answer dnsa; | |
153 | dns_scan dnss; | |
154 | ||
155 | handle = handle; /* Keep picky compilers happy */ | |
156 | filename = filename; | |
157 | length = length; | |
158 | do_cache = do_cache; | |
159 | ||
0d0c6357 NM |
160 | /* If the string starts with '>' we change the output separator. |
161 | If it's followed by ';' or ',' we set the TXT output separator. */ | |
0756eb3c | 162 | |
7bb56e1f PH |
163 | while (isspace(*keystring)) keystring++; |
164 | if (*keystring == '>') | |
0756eb3c | 165 | { |
7bb56e1f | 166 | outsep = keystring + 1; |
8e669ac1 | 167 | keystring += 2; |
0d0c6357 NM |
168 | if (*keystring == ',') |
169 | { | |
170 | outsep2 = keystring + 1; | |
171 | keystring += 2; | |
172 | } | |
173 | else if (*keystring == ';') | |
174 | { | |
175 | outsep2 = US""; | |
176 | keystring++; | |
177 | } | |
7bb56e1f | 178 | while (isspace(*keystring)) keystring++; |
8e669ac1 | 179 | } |
7bb56e1f | 180 | |
fd3b6a4a | 181 | /* Check for a modifier keyword. */ |
ff4dbb19 | 182 | |
fd3b6a4a JH |
183 | while ( strncmpic(keystring, US"defer_", 6) == 0 |
184 | || strncmpic(keystring, US"dnssec_", 7) == 0 | |
185 | ) | |
ff4dbb19 | 186 | { |
fd3b6a4a | 187 | if (strncmpic(keystring, US"defer_", 6) == 0) |
ff4dbb19 | 188 | { |
ff4dbb19 | 189 | keystring += 6; |
fd3b6a4a JH |
190 | if (strncmpic(keystring, US"strict", 6) == 0) |
191 | { | |
192 | defer_mode = DEFER; | |
193 | keystring += 6; | |
194 | } | |
195 | else if (strncmpic(keystring, US"lax", 3) == 0) | |
196 | { | |
197 | defer_mode = PASS; | |
198 | keystring += 3; | |
199 | } | |
200 | else if (strncmpic(keystring, US"never", 5) == 0) | |
201 | { | |
202 | defer_mode = OK; | |
203 | keystring += 5; | |
204 | } | |
205 | else | |
206 | { | |
207 | *errmsg = US"unsupported dnsdb defer behaviour"; | |
208 | return DEFER; | |
209 | } | |
ff4dbb19 PH |
210 | } |
211 | else | |
212 | { | |
fd3b6a4a JH |
213 | keystring += 7; |
214 | if (strncmpic(keystring, US"strict", 6) == 0) | |
215 | { | |
216 | dnssec_mode = DEFER; | |
217 | keystring += 6; | |
218 | } | |
219 | else if (strncmpic(keystring, US"lax", 3) == 0) | |
220 | { | |
221 | dnssec_mode = PASS; | |
222 | keystring += 3; | |
223 | } | |
224 | else if (strncmpic(keystring, US"never", 5) == 0) | |
225 | { | |
226 | dnssec_mode = OK; | |
227 | keystring += 5; | |
228 | } | |
229 | else | |
230 | { | |
231 | *errmsg = US"unsupported dnsdb dnssec behaviour"; | |
232 | return DEFER; | |
233 | } | |
ff4dbb19 PH |
234 | } |
235 | while (isspace(*keystring)) keystring++; | |
236 | if (*keystring++ != ',') | |
237 | { | |
fd3b6a4a | 238 | *errmsg = US"dnsdb modifier syntax error"; |
ff4dbb19 PH |
239 | return DEFER; |
240 | } | |
241 | while (isspace(*keystring)) keystring++; | |
242 | } | |
243 | ||
542bc632 PP |
244 | /* Figure out the "type" value if it is not T_TXT. |
245 | If the keystring contains an = this must be preceded by a valid type name. */ | |
7bb56e1f | 246 | |
542bc632 | 247 | type = T_TXT; |
7bb56e1f PH |
248 | if ((equals = Ustrchr(keystring, '=')) != NULL) |
249 | { | |
250 | int i, len; | |
251 | uschar *tend = equals; | |
8e669ac1 PH |
252 | |
253 | while (tend > keystring && isspace(tend[-1])) tend--; | |
254 | len = tend - keystring; | |
255 | ||
0756eb3c PH |
256 | for (i = 0; i < sizeof(type_names)/sizeof(uschar *); i++) |
257 | { | |
258 | if (len == Ustrlen(type_names[i]) && | |
259 | strncmpic(keystring, US type_names[i], len) == 0) | |
260 | { | |
261 | type = type_values[i]; | |
262 | break; | |
263 | } | |
264 | } | |
8e669ac1 | 265 | |
0756eb3c PH |
266 | if (i >= sizeof(type_names)/sizeof(uschar *)) |
267 | { | |
268 | *errmsg = US"unsupported DNS record type"; | |
269 | return DEFER; | |
270 | } | |
8e669ac1 | 271 | |
7bb56e1f PH |
272 | keystring = equals + 1; |
273 | while (isspace(*keystring)) keystring++; | |
0756eb3c | 274 | } |
8e669ac1 | 275 | |
7bb56e1f | 276 | /* Initialize the resolver in case this is the first time it has been used. */ |
0756eb3c | 277 | |
fd3b6a4a | 278 | dns_init(FALSE, FALSE, dnssec_mode != OK); |
0756eb3c | 279 | |
8e669ac1 PH |
280 | /* The remainder of the string must be a list of domains. As long as the lookup |
281 | for at least one of them succeeds, we return success. Failure means that none | |
282 | of them were found. | |
0756eb3c | 283 | |
8e669ac1 PH |
284 | The original implementation did not support a list of domains. Adding the list |
285 | feature is compatible, except in one case: when PTR records are being looked up | |
286 | for a single IPv6 address. Fortunately, we can hack in a compatibility feature | |
287 | here: If the type is PTR and no list separator is specified, and the entire | |
288 | remaining string is valid as an IP address, set an impossible separator so that | |
7bb56e1f | 289 | it is treated as one item. */ |
33397d19 | 290 | |
7bb56e1f | 291 | if (type == T_PTR && keystring[0] != '<' && |
7e66e54d | 292 | string_is_ip_address(keystring, NULL) != 0) |
7bb56e1f | 293 | sep = -1; |
0756eb3c | 294 | |
542bc632 PP |
295 | /* SPF strings should be concatenated without a separator, thus make |
296 | it the default if not defined (see RFC 4408 section 3.1.3). | |
297 | Multiple SPF records are forbidden (section 3.1.2) but are currently | |
be36e572 JH |
298 | not handled specially, thus they are concatenated with \n by default. |
299 | MX priority and value are space-separated by default. | |
300 | SRV and TLSA record parts are space-separated by default. */ | |
542bc632 | 301 | |
be36e572 JH |
302 | if (!outsep2) switch(type) |
303 | { | |
304 | case T_SPF: outsep2 = US""; break; | |
305 | case T_SRV: case T_MX: case T_TLSA: outsep2 = US" "; break; | |
306 | } | |
542bc632 | 307 | |
7bb56e1f | 308 | /* Now scan the list and do a lookup for each item */ |
0756eb3c | 309 | |
8e669ac1 | 310 | while ((domain = string_nextinlist(&keystring, &sep, buffer, sizeof(buffer))) |
7bb56e1f | 311 | != NULL) |
8e669ac1 | 312 | { |
7bb56e1f | 313 | uschar rbuffer[256]; |
e5a9dba6 PH |
314 | int searchtype = (type == T_CSA)? T_SRV : /* record type we want */ |
315 | (type == T_MXH)? T_MX : | |
316 | (type == T_ZNS)? T_NS : type; | |
317 | ||
318 | /* If the type is PTR or CSA, we have to construct the relevant magic lookup | |
319 | key if the original is an IP address (some experimental protocols are using | |
320 | PTR records for different purposes where the key string is a host name, and | |
321 | Exim's extended CSA can be keyed by domains or IP addresses). This code for | |
322 | doing the reversal is now in a separate function. */ | |
323 | ||
324 | if ((type == T_PTR || type == T_CSA) && | |
7e66e54d | 325 | string_is_ip_address(domain, NULL) != 0) |
0756eb3c | 326 | { |
7bb56e1f PH |
327 | dns_build_reverse(domain, rbuffer); |
328 | domain = rbuffer; | |
0756eb3c | 329 | } |
8e669ac1 | 330 | |
3a796370 | 331 | do |
c38d6da9 | 332 | { |
3a796370 JH |
333 | DEBUG(D_lookup) debug_printf("dnsdb key: %s\n", domain); |
334 | ||
335 | /* Do the lookup and sort out the result. There are four special types that | |
66be95e0 | 336 | are handled specially: T_CSA, T_ZNS, T_ADDRESSES and T_MXH. |
3a796370 | 337 | The first two are handled in a special lookup function so that the facility |
66be95e0 | 338 | could be used from other parts of the Exim code. T_ADDRESSES is handled by looping |
3a796370 JH |
339 | over the types of A lookup. T_MXH affects only what happens later on in |
340 | this function, but for tidiness it is handled by the "special". If the | |
341 | lookup fails, continue with the next domain. In the case of DEFER, adjust | |
342 | the final "nothing found" result, but carry on to the next domain. */ | |
343 | ||
344 | found = domain; | |
6abc190a | 345 | #if HAVE_IPV6 |
66be95e0 | 346 | if (type == T_ADDRESSES) /* NB cannot happen unless HAVE_IPV6 */ |
3a796370 | 347 | { |
66be95e0 | 348 | if (searchtype == T_ADDRESSES) |
6abc190a JH |
349 | # if defined(SUPPORT_A6) |
350 | searchtype = T_A6; | |
351 | # else | |
352 | searchtype = T_AAAA; | |
353 | # endif | |
3a796370 JH |
354 | else if (searchtype == T_A6) searchtype = T_AAAA; |
355 | else if (searchtype == T_AAAA) searchtype = T_A; | |
55414b25 | 356 | rc = dns_special_lookup(&dnsa, domain, searchtype, CUSS &found); |
3a796370 JH |
357 | } |
358 | else | |
6abc190a | 359 | #endif |
55414b25 | 360 | rc = dns_special_lookup(&dnsa, domain, type, CUSS &found); |
ea3bc19b | 361 | |
4e0983dc JH |
362 | lookup_dnssec_authenticated = dnssec_mode==OK ? NULL |
363 | : dns_is_secure(&dnsa) ? US"yes" : US"no"; | |
364 | ||
3a796370 | 365 | if (rc == DNS_NOMATCH || rc == DNS_NODATA) continue; |
91f40ccd | 366 | if ( rc != DNS_SUCCEED |
9852336a | 367 | || (dnssec_mode == DEFER && !dns_is_secure(&dnsa)) |
91f40ccd | 368 | ) |
3a796370 | 369 | { |
fd3b6a4a JH |
370 | if (defer_mode == DEFER) |
371 | { | |
9d9c3746 | 372 | dns_init(FALSE, FALSE, FALSE); /* clr dnssec bit */ |
fd3b6a4a JH |
373 | return DEFER; /* always defer */ |
374 | } | |
3a796370 JH |
375 | if (defer_mode == PASS) failrc = DEFER; /* defer only if all do */ |
376 | continue; /* treat defer as fail */ | |
377 | } | |
fd3b6a4a | 378 | |
8e669ac1 | 379 | |
3a796370 | 380 | /* Search the returned records */ |
8e669ac1 | 381 | |
3a796370 JH |
382 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); |
383 | rr != NULL; | |
384 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
0756eb3c | 385 | { |
3a796370 JH |
386 | if (rr->type != searchtype) continue; |
387 | ||
388 | /* There may be several addresses from an A6 record. Put the configured | |
389 | separator between them, just as for between several records. However, A6 | |
390 | support is not normally configured these days. */ | |
391 | ||
392 | if (type == T_A || | |
393 | #ifdef SUPPORT_A6 | |
394 | type == T_A6 || | |
395 | #endif | |
396 | type == T_AAAA || | |
66be95e0 | 397 | type == T_ADDRESSES) |
7bb56e1f | 398 | { |
3a796370 JH |
399 | dns_address *da; |
400 | for (da = dns_address_from_rr(&dnsa, rr); da != NULL; da = da->next) | |
401 | { | |
402 | if (ptr != 0) yield = string_cat(yield, &size, &ptr, outsep, 1); | |
403 | yield = string_cat(yield, &size, &ptr, da->address, | |
404 | Ustrlen(da->address)); | |
405 | } | |
406 | continue; | |
7bb56e1f | 407 | } |
8e669ac1 | 408 | |
3a796370 JH |
409 | /* Other kinds of record just have one piece of data each, but there may be |
410 | several of them, of course. */ | |
8e669ac1 | 411 | |
3a796370 | 412 | if (ptr != 0) yield = string_cat(yield, &size, &ptr, outsep, 1); |
8e669ac1 | 413 | |
3a796370 | 414 | if (type == T_TXT || type == T_SPF) |
80a47a2c | 415 | { |
3a796370 | 416 | if (outsep2 == NULL) |
0d0c6357 | 417 | { |
3a796370 JH |
418 | /* output only the first item of data */ |
419 | yield = string_cat(yield, &size, &ptr, (uschar *)(rr->data+1), | |
420 | (rr->data)[0]); | |
421 | } | |
422 | else | |
423 | { | |
424 | /* output all items */ | |
425 | int data_offset = 0; | |
426 | while (data_offset < rr->size) | |
427 | { | |
428 | uschar chunk_len = (rr->data)[data_offset++]; | |
429 | if (outsep2[0] != '\0' && data_offset != 1) | |
430 | yield = string_cat(yield, &size, &ptr, outsep2, 1); | |
431 | yield = string_cat(yield, &size, &ptr, | |
0d0c6357 | 432 | (uschar *)((rr->data)+data_offset), chunk_len); |
3a796370 JH |
433 | data_offset += chunk_len; |
434 | } | |
0d0c6357 | 435 | } |
80a47a2c | 436 | } |
1e06383a TL |
437 | else if (type == T_TLSA) |
438 | { | |
439 | uint8_t usage, selector, matching_type; | |
440 | uint16_t i, payload_length; | |
441 | uschar s[MAX_TLSA_EXPANDED_SIZE]; | |
442 | uschar * sp = s; | |
443 | uschar *p = (uschar *)(rr->data); | |
444 | ||
445 | usage = *p++; | |
446 | selector = *p++; | |
447 | matching_type = *p++; | |
448 | /* What's left after removing the first 3 bytes above */ | |
449 | payload_length = rr->size - 3; | |
be36e572 JH |
450 | sp += sprintf(CS s, "%d%c%d%c%d%c", usage, *outsep2, |
451 | selector, *outsep2, matching_type, *outsep2); | |
1e06383a TL |
452 | /* Now append the cert/identifier, one hex char at a time */ |
453 | for (i=0; | |
454 | i < payload_length && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4); | |
455 | i++) | |
456 | { | |
457 | sp += sprintf(CS sp, "%02x", (unsigned char)p[i]); | |
458 | } | |
459 | yield = string_cat(yield, &size, &ptr, s, Ustrlen(s)); | |
460 | } | |
3a796370 | 461 | else /* T_CNAME, T_CSA, T_MX, T_MXH, T_NS, T_PTR, T_SRV */ |
e5a9dba6 | 462 | { |
3a796370 JH |
463 | int priority, weight, port; |
464 | uschar s[264]; | |
465 | uschar *p = (uschar *)(rr->data); | |
e5a9dba6 | 466 | |
3a796370 | 467 | if (type == T_MXH) |
e5a9dba6 | 468 | { |
3a796370 JH |
469 | /* mxh ignores the priority number and includes only the hostnames */ |
470 | GETSHORT(priority, p); | |
e5a9dba6 | 471 | } |
3a796370 | 472 | else if (type == T_MX) |
e5a9dba6 | 473 | { |
3a796370 | 474 | GETSHORT(priority, p); |
be36e572 | 475 | sprintf(CS s, "%d%c", priority, *outsep2); |
3a796370 JH |
476 | yield = string_cat(yield, &size, &ptr, s, Ustrlen(s)); |
477 | } | |
478 | else if (type == T_SRV) | |
479 | { | |
480 | GETSHORT(priority, p); | |
481 | GETSHORT(weight, p); | |
482 | GETSHORT(port, p); | |
be36e572 JH |
483 | sprintf(CS s, "%d%c%d%c%d%c", priority, *outsep2, |
484 | weight, *outsep2, port, *outsep2); | |
3a796370 JH |
485 | yield = string_cat(yield, &size, &ptr, s, Ustrlen(s)); |
486 | } | |
487 | else if (type == T_CSA) | |
488 | { | |
489 | /* See acl_verify_csa() for more comments about CSA. */ | |
490 | ||
491 | GETSHORT(priority, p); | |
492 | GETSHORT(weight, p); | |
493 | GETSHORT(port, p); | |
494 | ||
495 | if (priority != 1) continue; /* CSA version must be 1 */ | |
496 | ||
497 | /* If the CSA record we found is not the one we asked for, analyse | |
498 | the subdomain assertions in the port field, else analyse the direct | |
499 | authorization status in the weight field. */ | |
500 | ||
1dc92d5a | 501 | if (Ustrcmp(found, domain) != 0) |
3a796370 JH |
502 | { |
503 | if (port & 1) *s = 'X'; /* explicit authorization required */ | |
504 | else *s = '?'; /* no subdomain assertions here */ | |
505 | } | |
506 | else | |
507 | { | |
508 | if (weight < 2) *s = 'N'; /* not authorized */ | |
509 | else if (weight == 2) *s = 'Y'; /* authorized */ | |
510 | else if (weight == 3) *s = '?'; /* unauthorizable */ | |
511 | else continue; /* invalid */ | |
512 | } | |
513 | ||
514 | s[1] = ' '; | |
515 | yield = string_cat(yield, &size, &ptr, s, 2); | |
e5a9dba6 PH |
516 | } |
517 | ||
3a796370 | 518 | /* GETSHORT() has advanced the pointer to the target domain. */ |
8e669ac1 | 519 | |
3a796370 JH |
520 | rc = dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, |
521 | (DN_EXPAND_ARG4_TYPE)(s), sizeof(s)); | |
8e669ac1 | 522 | |
3a796370 JH |
523 | /* If an overlong response was received, the data will have been |
524 | truncated and dn_expand may fail. */ | |
8e669ac1 | 525 | |
3a796370 JH |
526 | if (rc < 0) |
527 | { | |
528 | log_write(0, LOG_MAIN, "host name alias list truncated: type=%s " | |
529 | "domain=%s", dns_text_type(type), domain); | |
530 | break; | |
531 | } | |
532 | else yield = string_cat(yield, &size, &ptr, s, Ustrlen(s)); | |
7bb56e1f | 533 | } |
3a796370 JH |
534 | } /* Loop for list of returned records */ |
535 | ||
536 | /* Loop for set of A-lookupu types */ | |
66be95e0 | 537 | } while (type == T_ADDRESSES && searchtype != T_A); |
3a796370 JH |
538 | |
539 | } /* Loop for list of domains */ | |
7bb56e1f PH |
540 | |
541 | /* Reclaim unused memory */ | |
0756eb3c | 542 | |
7bb56e1f PH |
543 | store_reset(yield + ptr + 1); |
544 | ||
8e669ac1 | 545 | /* If ptr == 0 we have not found anything. Otherwise, insert the terminating |
7bb56e1f PH |
546 | zero and return the result. */ |
547 | ||
fd3b6a4a JH |
548 | dns_init(FALSE, FALSE, FALSE); /* clear the dnssec bit for getaddrbyname */ |
549 | ||
c38d6da9 | 550 | if (ptr == 0) return failrc; |
0756eb3c | 551 | yield[ptr] = 0; |
0756eb3c | 552 | *result = yield; |
0756eb3c PH |
553 | return OK; |
554 | } | |
555 | ||
6545de78 PP |
556 | |
557 | ||
558 | /************************************************* | |
559 | * Version reporting entry point * | |
560 | *************************************************/ | |
561 | ||
562 | /* See local README for interface description. */ | |
563 | ||
564 | #include "../version.h" | |
565 | ||
566 | void | |
567 | dnsdb_version_report(FILE *f) | |
568 | { | |
569 | #ifdef DYNLOOKUP | |
570 | fprintf(f, "Library version: DNSDB: Exim version %s\n", EXIM_VERSION_STR); | |
571 | #endif | |
572 | } | |
573 | ||
574 | ||
e6d225ae DW |
575 | static lookup_info _lookup_info = { |
576 | US"dnsdb", /* lookup name */ | |
577 | lookup_querystyle, /* query style */ | |
578 | dnsdb_open, /* open function */ | |
579 | NULL, /* check function */ | |
580 | dnsdb_find, /* find function */ | |
581 | NULL, /* no close function */ | |
582 | NULL, /* no tidy function */ | |
6545de78 PP |
583 | NULL, /* no quoting function */ |
584 | dnsdb_version_report /* version reporting */ | |
e6d225ae DW |
585 | }; |
586 | ||
587 | #ifdef DYNLOOKUP | |
588 | #define dnsdb_lookup_module_info _lookup_module_info | |
589 | #endif | |
590 | ||
591 | static lookup_info *_lookup_list[] = { &_lookup_info }; | |
592 | lookup_module_info dnsdb_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 }; | |
593 | ||
fd3b6a4a JH |
594 | /* vi: aw ai sw=2 |
595 | */ | |
0756eb3c | 596 | /* End of lookups/dnsdb.c */ |