Commit | Line | Data |
---|---|---|
0756eb3c PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
f9ba5e22 | 5 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
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 | |
acec9514 | 17 | # define T_TXT 16 |
0756eb3c PH |
18 | #endif |
19 | ||
eae0036b PP |
20 | /* Many systems do not have T_SPF. */ |
21 | #ifndef T_SPF | |
acec9514 | 22 | # define T_SPF 99 |
eae0036b PP |
23 | #endif |
24 | ||
1e06383a TL |
25 | /* New TLSA record for DANE */ |
26 | #ifndef T_TLSA | |
acec9514 | 27 | # define T_TLSA 52 |
1e06383a TL |
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 | ||
ab0e957b | 115 | - 'dnssec_FOO', with 'strict', 'lax' (default), and 'never'. 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; | |
7bb56e1f | 137 | int sep = 0; |
ff4dbb19 | 138 | int defer_mode = PASS; |
ab0e957b | 139 | int dnssec_mode = PASS; |
fd7f7910 JH |
140 | int save_retrans = dns_retrans; |
141 | int save_retry = dns_retry; | |
542bc632 | 142 | int type; |
c38d6da9 | 143 | int failrc = FAIL; |
55414b25 JH |
144 | const uschar *outsep = CUS"\n"; |
145 | const uschar *outsep2 = NULL; | |
e5a9dba6 | 146 | uschar *equals, *domain, *found; |
0756eb3c | 147 | |
8743d3ac JH |
148 | dns_answer * dnsa = store_get_dns_answer(); |
149 | dns_scan dnss; | |
150 | ||
acec9514 | 151 | /* Because we're working in the search pool, we try to reclaim as much |
0756eb3c PH |
152 | store as possible later, so we preallocate the result here */ |
153 | ||
acec9514 | 154 | gstring * yield = string_get(256); |
0756eb3c | 155 | |
0756eb3c PH |
156 | handle = handle; /* Keep picky compilers happy */ |
157 | filename = filename; | |
158 | length = length; | |
159 | do_cache = do_cache; | |
160 | ||
0d0c6357 NM |
161 | /* If the string starts with '>' we change the output separator. |
162 | If it's followed by ';' or ',' we set the TXT output separator. */ | |
0756eb3c | 163 | |
7bb56e1f PH |
164 | while (isspace(*keystring)) keystring++; |
165 | if (*keystring == '>') | |
0756eb3c | 166 | { |
7bb56e1f | 167 | outsep = keystring + 1; |
8e669ac1 | 168 | keystring += 2; |
0d0c6357 NM |
169 | if (*keystring == ',') |
170 | { | |
171 | outsep2 = keystring + 1; | |
172 | keystring += 2; | |
173 | } | |
174 | else if (*keystring == ';') | |
175 | { | |
176 | outsep2 = US""; | |
177 | keystring++; | |
178 | } | |
7bb56e1f | 179 | while (isspace(*keystring)) keystring++; |
8e669ac1 | 180 | } |
7bb56e1f | 181 | |
fd3b6a4a | 182 | /* Check for a modifier keyword. */ |
ff4dbb19 | 183 | |
fd7f7910 | 184 | for (;;) |
ff4dbb19 | 185 | { |
fd3b6a4a | 186 | if (strncmpic(keystring, US"defer_", 6) == 0) |
ff4dbb19 | 187 | { |
ff4dbb19 | 188 | keystring += 6; |
fd3b6a4a | 189 | if (strncmpic(keystring, US"strict", 6) == 0) |
fd7f7910 | 190 | { defer_mode = DEFER; keystring += 6; } |
fd3b6a4a | 191 | else if (strncmpic(keystring, US"lax", 3) == 0) |
fd7f7910 | 192 | { defer_mode = PASS; keystring += 3; } |
fd3b6a4a | 193 | else if (strncmpic(keystring, US"never", 5) == 0) |
fd7f7910 | 194 | { defer_mode = OK; keystring += 5; } |
fd3b6a4a JH |
195 | else |
196 | { | |
197 | *errmsg = US"unsupported dnsdb defer behaviour"; | |
198 | return DEFER; | |
199 | } | |
ff4dbb19 | 200 | } |
fd7f7910 | 201 | else if (strncmpic(keystring, US"dnssec_", 7) == 0) |
ff4dbb19 | 202 | { |
fd3b6a4a JH |
203 | keystring += 7; |
204 | if (strncmpic(keystring, US"strict", 6) == 0) | |
fd7f7910 | 205 | { dnssec_mode = DEFER; keystring += 6; } |
fd3b6a4a | 206 | else if (strncmpic(keystring, US"lax", 3) == 0) |
fd7f7910 JH |
207 | { dnssec_mode = PASS; keystring += 3; } |
208 | else if (strncmpic(keystring, US"never", 5) == 0) | |
209 | { dnssec_mode = OK; keystring += 5; } | |
210 | else | |
fd3b6a4a | 211 | { |
fd7f7910 JH |
212 | *errmsg = US"unsupported dnsdb dnssec behaviour"; |
213 | return DEFER; | |
fd3b6a4a | 214 | } |
fd7f7910 JH |
215 | } |
216 | else if (strncmpic(keystring, US"retrans_", 8) == 0) | |
217 | { | |
218 | int timeout_sec; | |
219 | if ((timeout_sec = readconf_readtime(keystring += 8, ',', FALSE)) <= 0) | |
fd3b6a4a | 220 | { |
fd7f7910 JH |
221 | *errmsg = US"unsupported dnsdb timeout value"; |
222 | return DEFER; | |
fd3b6a4a | 223 | } |
fd7f7910 JH |
224 | dns_retrans = timeout_sec; |
225 | while (*keystring != ',') keystring++; | |
226 | } | |
227 | else if (strncmpic(keystring, US"retry_", 6) == 0) | |
228 | { | |
229 | int retries; | |
fc362fc5 | 230 | if ((retries = (int)strtol(CCS keystring + 6, CSS &keystring, 0)) < 0) |
fd3b6a4a | 231 | { |
fd7f7910 | 232 | *errmsg = US"unsupported dnsdb retry count"; |
fd3b6a4a JH |
233 | return DEFER; |
234 | } | |
fd7f7910 | 235 | dns_retry = retries; |
ff4dbb19 | 236 | } |
fd7f7910 JH |
237 | else |
238 | break; | |
239 | ||
ff4dbb19 PH |
240 | while (isspace(*keystring)) keystring++; |
241 | if (*keystring++ != ',') | |
242 | { | |
fd3b6a4a | 243 | *errmsg = US"dnsdb modifier syntax error"; |
ff4dbb19 PH |
244 | return DEFER; |
245 | } | |
246 | while (isspace(*keystring)) keystring++; | |
247 | } | |
248 | ||
542bc632 PP |
249 | /* Figure out the "type" value if it is not T_TXT. |
250 | If the keystring contains an = this must be preceded by a valid type name. */ | |
7bb56e1f | 251 | |
542bc632 | 252 | type = T_TXT; |
7bb56e1f PH |
253 | if ((equals = Ustrchr(keystring, '=')) != NULL) |
254 | { | |
255 | int i, len; | |
256 | uschar *tend = equals; | |
8e669ac1 PH |
257 | |
258 | while (tend > keystring && isspace(tend[-1])) tend--; | |
259 | len = tend - keystring; | |
260 | ||
9be4572b | 261 | for (i = 0; i < nelem(type_names); i++) |
0756eb3c PH |
262 | if (len == Ustrlen(type_names[i]) && |
263 | strncmpic(keystring, US type_names[i], len) == 0) | |
264 | { | |
265 | type = type_values[i]; | |
266 | break; | |
267 | } | |
8e669ac1 | 268 | |
9be4572b | 269 | if (i >= nelem(type_names)) |
0756eb3c PH |
270 | { |
271 | *errmsg = US"unsupported DNS record type"; | |
272 | return DEFER; | |
273 | } | |
8e669ac1 | 274 | |
7bb56e1f PH |
275 | keystring = equals + 1; |
276 | while (isspace(*keystring)) keystring++; | |
0756eb3c | 277 | } |
8e669ac1 | 278 | |
7bb56e1f | 279 | /* Initialize the resolver in case this is the first time it has been used. */ |
0756eb3c | 280 | |
fd3b6a4a | 281 | dns_init(FALSE, FALSE, dnssec_mode != OK); |
0756eb3c | 282 | |
8e669ac1 PH |
283 | /* The remainder of the string must be a list of domains. As long as the lookup |
284 | for at least one of them succeeds, we return success. Failure means that none | |
285 | of them were found. | |
0756eb3c | 286 | |
8e669ac1 PH |
287 | The original implementation did not support a list of domains. Adding the list |
288 | feature is compatible, except in one case: when PTR records are being looked up | |
289 | for a single IPv6 address. Fortunately, we can hack in a compatibility feature | |
290 | here: If the type is PTR and no list separator is specified, and the entire | |
291 | remaining string is valid as an IP address, set an impossible separator so that | |
7bb56e1f | 292 | it is treated as one item. */ |
33397d19 | 293 | |
7bb56e1f | 294 | if (type == T_PTR && keystring[0] != '<' && |
7e66e54d | 295 | string_is_ip_address(keystring, NULL) != 0) |
7bb56e1f | 296 | sep = -1; |
0756eb3c | 297 | |
542bc632 PP |
298 | /* SPF strings should be concatenated without a separator, thus make |
299 | it the default if not defined (see RFC 4408 section 3.1.3). | |
300 | Multiple SPF records are forbidden (section 3.1.2) but are currently | |
be36e572 JH |
301 | not handled specially, thus they are concatenated with \n by default. |
302 | MX priority and value are space-separated by default. | |
303 | SRV and TLSA record parts are space-separated by default. */ | |
542bc632 | 304 | |
be36e572 JH |
305 | if (!outsep2) switch(type) |
306 | { | |
307 | case T_SPF: outsep2 = US""; break; | |
308 | case T_SRV: case T_MX: case T_TLSA: outsep2 = US" "; break; | |
309 | } | |
542bc632 | 310 | |
7bb56e1f | 311 | /* Now scan the list and do a lookup for each item */ |
0756eb3c | 312 | |
fd7f7910 | 313 | while ((domain = string_nextinlist(&keystring, &sep, NULL, 0))) |
8e669ac1 | 314 | { |
7bb56e1f | 315 | uschar rbuffer[256]; |
b09c1793 JH |
316 | int searchtype = type == T_CSA ? T_SRV : /* record type we want */ |
317 | type == T_MXH ? T_MX : | |
318 | type == T_ZNS ? T_NS : type; | |
e5a9dba6 PH |
319 | |
320 | /* If the type is PTR or CSA, we have to construct the relevant magic lookup | |
321 | key if the original is an IP address (some experimental protocols are using | |
322 | PTR records for different purposes where the key string is a host name, and | |
323 | Exim's extended CSA can be keyed by domains or IP addresses). This code for | |
324 | doing the reversal is now in a separate function. */ | |
325 | ||
326 | if ((type == T_PTR || type == T_CSA) && | |
7e66e54d | 327 | string_is_ip_address(domain, NULL) != 0) |
0756eb3c | 328 | { |
7bb56e1f PH |
329 | dns_build_reverse(domain, rbuffer); |
330 | domain = rbuffer; | |
0756eb3c | 331 | } |
8e669ac1 | 332 | |
3a796370 | 333 | do |
c38d6da9 | 334 | { |
42c7f0b4 | 335 | DEBUG(D_lookup) debug_printf_indent("dnsdb key: %s\n", domain); |
3a796370 JH |
336 | |
337 | /* Do the lookup and sort out the result. There are four special types that | |
66be95e0 | 338 | are handled specially: T_CSA, T_ZNS, T_ADDRESSES and T_MXH. |
3a796370 | 339 | The first two are handled in a special lookup function so that the facility |
66be95e0 | 340 | could be used from other parts of the Exim code. T_ADDRESSES is handled by looping |
3a796370 JH |
341 | over the types of A lookup. T_MXH affects only what happens later on in |
342 | this function, but for tidiness it is handled by the "special". If the | |
343 | lookup fails, continue with the next domain. In the case of DEFER, adjust | |
344 | the final "nothing found" result, but carry on to the next domain. */ | |
345 | ||
346 | found = domain; | |
6abc190a | 347 | #if HAVE_IPV6 |
66be95e0 | 348 | if (type == T_ADDRESSES) /* NB cannot happen unless HAVE_IPV6 */ |
3a796370 | 349 | { |
cc00f4af | 350 | if (searchtype == T_ADDRESSES) searchtype = T_AAAA; |
3a796370 | 351 | else if (searchtype == T_AAAA) searchtype = T_A; |
8743d3ac | 352 | rc = dns_special_lookup(dnsa, domain, searchtype, CUSS &found); |
3a796370 JH |
353 | } |
354 | else | |
6abc190a | 355 | #endif |
8743d3ac | 356 | rc = dns_special_lookup(dnsa, domain, type, CUSS &found); |
ea3bc19b | 357 | |
4e0983dc | 358 | lookup_dnssec_authenticated = dnssec_mode==OK ? NULL |
8743d3ac | 359 | : dns_is_secure(dnsa) ? US"yes" : US"no"; |
4e0983dc | 360 | |
3a796370 | 361 | if (rc == DNS_NOMATCH || rc == DNS_NODATA) continue; |
91f40ccd | 362 | if ( rc != DNS_SUCCEED |
8743d3ac | 363 | || (dnssec_mode == DEFER && !dns_is_secure(dnsa)) |
91f40ccd | 364 | ) |
3a796370 | 365 | { |
fd3b6a4a JH |
366 | if (defer_mode == DEFER) |
367 | { | |
fd7f7910 JH |
368 | dns_retrans = save_retrans; |
369 | dns_retry = save_retry; | |
9d9c3746 | 370 | dns_init(FALSE, FALSE, FALSE); /* clr dnssec bit */ |
fd3b6a4a JH |
371 | return DEFER; /* always defer */ |
372 | } | |
3a796370 JH |
373 | if (defer_mode == PASS) failrc = DEFER; /* defer only if all do */ |
374 | continue; /* treat defer as fail */ | |
375 | } | |
fd3b6a4a | 376 | |
8e669ac1 | 377 | |
3a796370 | 378 | /* Search the returned records */ |
8e669ac1 | 379 | |
8743d3ac JH |
380 | for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr; |
381 | rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) if (rr->type == searchtype) | |
0756eb3c | 382 | { |
14b3c5bc JH |
383 | if (*do_cache > rr->ttl) |
384 | *do_cache = rr->ttl; | |
385 | ||
cc00f4af | 386 | if (type == T_A || type == T_AAAA || type == T_ADDRESSES) |
7bb56e1f | 387 | { |
8743d3ac | 388 | for (dns_address * da = dns_address_from_rr(dnsa, rr); da; da = da->next) |
3a796370 | 389 | { |
acec9514 JH |
390 | if (yield->ptr) yield = string_catn(yield, outsep, 1); |
391 | yield = string_cat(yield, da->address); | |
3a796370 JH |
392 | } |
393 | continue; | |
7bb56e1f | 394 | } |
8e669ac1 | 395 | |
3a796370 JH |
396 | /* Other kinds of record just have one piece of data each, but there may be |
397 | several of them, of course. */ | |
8e669ac1 | 398 | |
acec9514 | 399 | if (yield->ptr) yield = string_catn(yield, outsep, 1); |
8e669ac1 | 400 | |
3a796370 | 401 | if (type == T_TXT || type == T_SPF) |
80a47a2c | 402 | { |
acec9514 JH |
403 | if (outsep2 == NULL) /* output only the first item of data */ |
404 | yield = string_catn(yield, US (rr->data+1), (rr->data)[0]); | |
3a796370 JH |
405 | else |
406 | { | |
407 | /* output all items */ | |
408 | int data_offset = 0; | |
409 | while (data_offset < rr->size) | |
410 | { | |
411 | uschar chunk_len = (rr->data)[data_offset++]; | |
412 | if (outsep2[0] != '\0' && data_offset != 1) | |
acec9514 JH |
413 | yield = string_catn(yield, outsep2, 1); |
414 | yield = string_catn(yield, US ((rr->data)+data_offset), chunk_len); | |
3a796370 JH |
415 | data_offset += chunk_len; |
416 | } | |
0d0c6357 | 417 | } |
80a47a2c | 418 | } |
1e06383a TL |
419 | else if (type == T_TLSA) |
420 | { | |
421 | uint8_t usage, selector, matching_type; | |
624f33df | 422 | uint16_t payload_length; |
1e06383a TL |
423 | uschar s[MAX_TLSA_EXPANDED_SIZE]; |
424 | uschar * sp = s; | |
d2a2c69b | 425 | uschar * p = US rr->data; |
1e06383a TL |
426 | |
427 | usage = *p++; | |
428 | selector = *p++; | |
429 | matching_type = *p++; | |
430 | /* What's left after removing the first 3 bytes above */ | |
431 | payload_length = rr->size - 3; | |
be36e572 JH |
432 | sp += sprintf(CS s, "%d%c%d%c%d%c", usage, *outsep2, |
433 | selector, *outsep2, matching_type, *outsep2); | |
1e06383a | 434 | /* Now append the cert/identifier, one hex char at a time */ |
624f33df JH |
435 | while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4)) |
436 | sp += sprintf(CS sp, "%02x", *p++); | |
d2a2c69b | 437 | |
acec9514 | 438 | yield = string_cat(yield, s); |
1e06383a | 439 | } |
d2a2c69b | 440 | else /* T_CNAME, T_CSA, T_MX, T_MXH, T_NS, T_PTR, T_SOA, T_SRV */ |
e5a9dba6 | 441 | { |
3a796370 JH |
442 | int priority, weight, port; |
443 | uschar s[264]; | |
d2a2c69b JH |
444 | uschar * p = US rr->data; |
445 | ||
446 | switch (type) | |
447 | { | |
448 | case T_MXH: | |
449 | /* mxh ignores the priority number and includes only the hostnames */ | |
450 | GETSHORT(priority, p); | |
451 | break; | |
452 | ||
453 | case T_MX: | |
454 | GETSHORT(priority, p); | |
455 | sprintf(CS s, "%d%c", priority, *outsep2); | |
acec9514 | 456 | yield = string_cat(yield, s); |
d2a2c69b JH |
457 | break; |
458 | ||
459 | case T_SRV: | |
460 | GETSHORT(priority, p); | |
461 | GETSHORT(weight, p); | |
462 | GETSHORT(port, p); | |
463 | sprintf(CS s, "%d%c%d%c%d%c", priority, *outsep2, | |
464 | weight, *outsep2, port, *outsep2); | |
acec9514 | 465 | yield = string_cat(yield, s); |
d2a2c69b JH |
466 | break; |
467 | ||
468 | case T_CSA: | |
469 | /* See acl_verify_csa() for more comments about CSA. */ | |
470 | GETSHORT(priority, p); | |
471 | GETSHORT(weight, p); | |
472 | GETSHORT(port, p); | |
473 | ||
474 | if (priority != 1) continue; /* CSA version must be 1 */ | |
475 | ||
476 | /* If the CSA record we found is not the one we asked for, analyse | |
477 | the subdomain assertions in the port field, else analyse the direct | |
478 | authorization status in the weight field. */ | |
479 | ||
480 | if (Ustrcmp(found, domain) != 0) | |
481 | { | |
482 | if (port & 1) *s = 'X'; /* explicit authorization required */ | |
483 | else *s = '?'; /* no subdomain assertions here */ | |
484 | } | |
485 | else | |
486 | { | |
487 | if (weight < 2) *s = 'N'; /* not authorized */ | |
488 | else if (weight == 2) *s = 'Y'; /* authorized */ | |
489 | else if (weight == 3) *s = '?'; /* unauthorizable */ | |
490 | else continue; /* invalid */ | |
491 | } | |
492 | ||
493 | s[1] = ' '; | |
acec9514 | 494 | yield = string_catn(yield, s, 2); |
d2a2c69b JH |
495 | break; |
496 | ||
497 | default: | |
498 | break; | |
499 | } | |
e5a9dba6 | 500 | |
3a796370 | 501 | /* GETSHORT() has advanced the pointer to the target domain. */ |
8e669ac1 | 502 | |
8743d3ac | 503 | rc = dn_expand(dnsa->answer, dnsa->answer + dnsa->answerlen, p, |
d2a2c69b | 504 | (DN_EXPAND_ARG4_TYPE)s, sizeof(s)); |
8e669ac1 | 505 | |
3a796370 JH |
506 | /* If an overlong response was received, the data will have been |
507 | truncated and dn_expand may fail. */ | |
8e669ac1 | 508 | |
3a796370 JH |
509 | if (rc < 0) |
510 | { | |
511 | log_write(0, LOG_MAIN, "host name alias list truncated: type=%s " | |
512 | "domain=%s", dns_text_type(type), domain); | |
513 | break; | |
514 | } | |
acec9514 | 515 | else yield = string_cat(yield, s); |
d2a2c69b JH |
516 | |
517 | if (type == T_SOA && outsep2 != NULL) | |
518 | { | |
519 | unsigned long serial, refresh, retry, expire, minimum; | |
520 | ||
521 | p += rc; | |
acec9514 | 522 | yield = string_catn(yield, outsep2, 1); |
d2a2c69b | 523 | |
8743d3ac | 524 | rc = dn_expand(dnsa->answer, dnsa->answer + dnsa->answerlen, p, |
d2a2c69b JH |
525 | (DN_EXPAND_ARG4_TYPE)s, sizeof(s)); |
526 | if (rc < 0) | |
527 | { | |
528 | log_write(0, LOG_MAIN, "responsible-mailbox truncated: type=%s " | |
529 | "domain=%s", dns_text_type(type), domain); | |
530 | break; | |
531 | } | |
acec9514 | 532 | else yield = string_cat(yield, s); |
d2a2c69b JH |
533 | |
534 | p += rc; | |
535 | GETLONG(serial, p); GETLONG(refresh, p); | |
536 | GETLONG(retry, p); GETLONG(expire, p); GETLONG(minimum, p); | |
fc362fc5 | 537 | sprintf(CS s, "%c%lu%c%lu%c%lu%c%lu%c%lu", |
d2a2c69b JH |
538 | *outsep2, serial, *outsep2, refresh, |
539 | *outsep2, retry, *outsep2, expire, *outsep2, minimum); | |
acec9514 | 540 | yield = string_cat(yield, s); |
d2a2c69b | 541 | } |
7bb56e1f | 542 | } |
3a796370 JH |
543 | } /* Loop for list of returned records */ |
544 | ||
4c04137d | 545 | /* Loop for set of A-lookup types */ |
66be95e0 | 546 | } while (type == T_ADDRESSES && searchtype != T_A); |
3a796370 JH |
547 | |
548 | } /* Loop for list of domains */ | |
7bb56e1f PH |
549 | |
550 | /* Reclaim unused memory */ | |
0756eb3c | 551 | |
f3ebb786 | 552 | gstring_release_unused(yield); |
7bb56e1f | 553 | |
acec9514 | 554 | /* If yield NULL we have not found anything. Otherwise, insert the terminating |
7bb56e1f PH |
555 | zero and return the result. */ |
556 | ||
fd7f7910 JH |
557 | dns_retrans = save_retrans; |
558 | dns_retry = save_retry; | |
fd3b6a4a JH |
559 | dns_init(FALSE, FALSE, FALSE); /* clear the dnssec bit for getaddrbyname */ |
560 | ||
acec9514 JH |
561 | if (!yield || !yield->ptr) return failrc; |
562 | ||
563 | *result = string_from_gstring(yield); | |
0756eb3c PH |
564 | return OK; |
565 | } | |
566 | ||
6545de78 PP |
567 | |
568 | ||
569 | /************************************************* | |
570 | * Version reporting entry point * | |
571 | *************************************************/ | |
572 | ||
573 | /* See local README for interface description. */ | |
574 | ||
575 | #include "../version.h" | |
576 | ||
577 | void | |
578 | dnsdb_version_report(FILE *f) | |
579 | { | |
580 | #ifdef DYNLOOKUP | |
581 | fprintf(f, "Library version: DNSDB: Exim version %s\n", EXIM_VERSION_STR); | |
582 | #endif | |
583 | } | |
584 | ||
585 | ||
e6d225ae DW |
586 | static lookup_info _lookup_info = { |
587 | US"dnsdb", /* lookup name */ | |
588 | lookup_querystyle, /* query style */ | |
589 | dnsdb_open, /* open function */ | |
590 | NULL, /* check function */ | |
591 | dnsdb_find, /* find function */ | |
592 | NULL, /* no close function */ | |
593 | NULL, /* no tidy function */ | |
6545de78 PP |
594 | NULL, /* no quoting function */ |
595 | dnsdb_version_report /* version reporting */ | |
e6d225ae DW |
596 | }; |
597 | ||
598 | #ifdef DYNLOOKUP | |
599 | #define dnsdb_lookup_module_info _lookup_module_info | |
600 | #endif | |
601 | ||
602 | static lookup_info *_lookup_list[] = { &_lookup_info }; | |
603 | lookup_module_info dnsdb_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 }; | |
604 | ||
fd3b6a4a JH |
605 | /* vi: aw ai sw=2 |
606 | */ | |
0756eb3c | 607 | /* End of lookups/dnsdb.c */ |