Commit | Line | Data |
---|---|---|
c55a77db PH |
1 | /************************************************* |
2 | * fakens - A Fake Nameserver Program * | |
3 | *************************************************/ | |
4 | ||
5 | /* This program exists to support the testing of DNS handling code in Exim. It | |
6 | avoids the need to install special zones in a real nameserver. When Exim is | |
7 | running in its (new) test harness, DNS lookups are first passed to this program | |
8 | instead of to the real resolver. (With a few exceptions - see the discussion in | |
9 | the test suite's README file.) The program is also passed the name of the Exim | |
10 | spool directory; it expects to find its "zone files" in ../dnszones relative to | |
11 | that directory. Note that there is little checking in this program. The fake | |
12 | zone files are assumed to be syntactically valid. | |
13 | ||
14 | The zones that are handled are found by scanning the dnszones directory. A file | |
15 | whose name is of the form db.ip4.x is a zone file for .x.in-addr.arpa; a file | |
16 | whose name is of the form db.ip6.x is a zone file for .x.ip6.arpa; a file of | |
17 | the form db.anything.else is a zone file for .anything.else. A file of the form | |
18 | qualify.x.y specifies the domain that is used to qualify single-component | |
19 | names, except for the name "dontqualify". | |
20 | ||
21 | The arguments to the program are: | |
22 | ||
23 | the name of the Exim spool directory | |
24 | the domain name that is being sought | |
25 | the DNS record type that is being sought | |
26 | ||
27 | The output from the program is written to stdout. It is supposed to be in | |
28 | exactly the same format as a traditional namserver response (see RFC 1035) so | |
29 | that Exim can process it as normal. At present, no compression is used. | |
30 | Error messages are written to stderr. | |
31 | ||
32 | The return codes from the program are zero for success, and otherwise the | |
33 | values that are set in h_errno after a failing call to the normal resolver: | |
34 | ||
35 | 1 HOST_NOT_FOUND host not found (authoritative) | |
36 | 2 TRY_AGAIN server failure | |
37 | 3 NO_RECOVERY non-recoverable error | |
38 | 4 NO_DATA valid name, no data of requested type | |
39 | ||
40 | In a real nameserver, TRY_AGAIN is also used for a non-authoritative not found, | |
41 | but it is not used for that here. There is also one extra return code: | |
42 | ||
43 | 5 PASS_ON requests Exim to call res_search() | |
44 | ||
45 | This is used for zones that fakens does not recognize. It is also used if a | |
46 | line in the zone file contains exactly this: | |
47 | ||
48 | PASS ON NOT FOUND | |
49 | ||
50 | and the domain is not found. It converts the the result to PASS_ON instead of | |
4d4c2a9b JH |
51 | HOST_NOT_FOUND. |
52 | ||
846430d9 JH |
53 | Any DNS record line in a zone file can be prefixed with "DELAY=" and |
54 | a number of milliseconds (followed by whitespace). | |
55 | ||
4d4c2a9b JH |
56 | Any DNS record line in a zone file can be prefixed with "DNSSEC" and |
57 | at least one space; if all the records found by a lookup are marked | |
58 | as such then the response will have the "AD" bit set. */ | |
c55a77db PH |
59 | |
60 | #include <ctype.h> | |
61 | #include <stdarg.h> | |
62 | #include <stdio.h> | |
e265af1f | 63 | #include <stdlib.h> |
c55a77db PH |
64 | #include <string.h> |
65 | #include <netdb.h> | |
66 | #include <errno.h> | |
67 | #include <arpa/nameser.h> | |
68 | #include <sys/types.h> | |
846430d9 | 69 | #include <sys/time.h> |
c55a77db PH |
70 | #include <dirent.h> |
71 | ||
72 | #define FALSE 0 | |
73 | #define TRUE 1 | |
74 | #define PASS_ON 5 | |
75 | ||
76 | typedef int BOOL; | |
77 | typedef unsigned char uschar; | |
78 | ||
79 | #define CS (char *) | |
80 | #define CCS (const char *) | |
81 | #define US (unsigned char *) | |
82 | ||
83 | #define Ustrcat(s,t) strcat(CS(s),CCS(t)) | |
84 | #define Ustrchr(s,n) US strchr(CCS(s),n) | |
85 | #define Ustrcmp(s,t) strcmp(CCS(s),CCS(t)) | |
86 | #define Ustrcpy(s,t) strcpy(CS(s),CCS(t)) | |
87 | #define Ustrlen(s) (int)strlen(CCS(s)) | |
88 | #define Ustrncmp(s,t,n) strncmp(CCS(s),CCS(t),n) | |
89 | #define Ustrncpy(s,t,n) strncpy(CS(s),CCS(t),n) | |
90 | ||
c55a77db PH |
91 | typedef struct zoneitem { |
92 | uschar *zone; | |
93 | uschar *zonefile; | |
94 | } zoneitem; | |
95 | ||
96 | typedef struct tlist { | |
97 | uschar *name; | |
98 | int value; | |
99 | } tlist; | |
100 | ||
101 | /* On some (older?) operating systems, the standard ns_t_xxx definitions are | |
102 | not available, and only the older T_xxx ones exist in nameser.h. If ns_t_a is | |
103 | not defined, assume we are in this state. A really old system might not even | |
104 | know about AAAA and SRV at all. */ | |
105 | ||
106 | #ifndef ns_t_a | |
b4161d10 JH |
107 | # define ns_t_a T_A |
108 | # define ns_t_ns T_NS | |
109 | # define ns_t_cname T_CNAME | |
110 | # define ns_t_soa T_SOA | |
111 | # define ns_t_ptr T_PTR | |
112 | # define ns_t_mx T_MX | |
113 | # define ns_t_txt T_TXT | |
114 | # define ns_t_aaaa T_AAAA | |
115 | # define ns_t_srv T_SRV | |
116 | # define ns_t_tlsa T_TLSA | |
117 | # ifndef T_AAAA | |
118 | # define T_AAAA 28 | |
119 | # endif | |
120 | # ifndef T_SRV | |
121 | # define T_SRV 33 | |
122 | # endif | |
123 | # ifndef T_TLSA | |
124 | # define T_TLSA 52 | |
125 | # endif | |
c55a77db PH |
126 | #endif |
127 | ||
128 | static tlist type_list[] = { | |
129 | { US"A", ns_t_a }, | |
130 | { US"NS", ns_t_ns }, | |
131 | { US"CNAME", ns_t_cname }, | |
132 | /* { US"SOA", ns_t_soa }, Not currently in use */ | |
133 | { US"PTR", ns_t_ptr }, | |
134 | { US"MX", ns_t_mx }, | |
135 | { US"TXT", ns_t_txt }, | |
136 | { US"AAAA", ns_t_aaaa }, | |
137 | { US"SRV", ns_t_srv }, | |
b4161d10 | 138 | { US"TLSA", ns_t_tlsa }, |
c55a77db PH |
139 | { NULL, 0 } |
140 | }; | |
141 | ||
142 | ||
143 | ||
144 | /************************************************* | |
145 | * Get memory and sprintf into it * | |
146 | *************************************************/ | |
147 | ||
148 | /* This is used when building a table of zones and their files. | |
149 | ||
150 | Arguments: | |
151 | format a format string | |
152 | ... arguments | |
153 | ||
154 | Returns: pointer to formatted string | |
155 | */ | |
156 | ||
157 | static uschar * | |
158 | fcopystring(uschar *format, ...) | |
159 | { | |
160 | uschar *yield; | |
161 | char buffer[256]; | |
162 | va_list ap; | |
163 | va_start(ap, format); | |
e265af1f | 164 | vsprintf(buffer, CS format, ap); |
c55a77db PH |
165 | va_end(ap); |
166 | yield = (uschar *)malloc(Ustrlen(buffer) + 1); | |
167 | Ustrcpy(yield, buffer); | |
168 | return yield; | |
169 | } | |
170 | ||
171 | ||
172 | /************************************************* | |
173 | * Pack name into memory * | |
174 | *************************************************/ | |
175 | ||
176 | /* This function packs a domain name into memory according to DNS rules. At | |
177 | present, it doesn't do any compression. | |
178 | ||
179 | Arguments: | |
180 | name the name | |
181 | pk where to put it | |
182 | ||
183 | Returns: the updated value of pk | |
184 | */ | |
185 | ||
186 | static uschar * | |
187 | packname(uschar *name, uschar *pk) | |
188 | { | |
189 | while (*name != 0) | |
190 | { | |
191 | uschar *p = name; | |
192 | while (*p != 0 && *p != '.') p++; | |
193 | *pk++ = (p - name); | |
194 | memmove(pk, name, p - name); | |
195 | pk += p - name; | |
196 | name = (*p == 0)? p : p + 1; | |
197 | } | |
198 | *pk++ = 0; | |
199 | return pk; | |
200 | } | |
201 | ||
36b894a6 JH |
202 | uschar * |
203 | bytefield(uschar ** pp, uschar * pk) | |
204 | { | |
205 | unsigned value = 0; | |
206 | uschar * p = *pp; | |
207 | ||
208 | while (isdigit(*p)) value = value*10 + *p++ - '0'; | |
209 | while (isspace(*p)) p++; | |
210 | *pp = p; | |
211 | *pk++ = value & 255; | |
212 | return pk; | |
213 | } | |
214 | ||
b4161d10 JH |
215 | uschar * |
216 | shortfield(uschar ** pp, uschar * pk) | |
217 | { | |
218 | unsigned value = 0; | |
219 | uschar * p = *pp; | |
220 | ||
221 | while (isdigit(*p)) value = value*10 + *p++ - '0'; | |
222 | while (isspace(*p)) p++; | |
223 | *pp = p; | |
224 | *pk++ = (value >> 8) & 255; | |
225 | *pk++ = value & 255; | |
226 | return pk; | |
227 | } | |
228 | ||
c55a77db PH |
229 | |
230 | ||
846430d9 JH |
231 | /*************************************************/ |
232 | ||
233 | static void | |
234 | milliwait(struct itimerval *itval) | |
235 | { | |
236 | sigset_t sigmask; | |
237 | sigset_t old_sigmask; | |
238 | ||
239 | if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0) | |
240 | return; | |
241 | (void)sigemptyset(&sigmask); /* Empty mask */ | |
242 | (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */ | |
243 | (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */ | |
244 | (void)setitimer(ITIMER_REAL, itval, NULL); /* Start timer */ | |
245 | (void)sigfillset(&sigmask); /* All signals */ | |
246 | (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */ | |
247 | (void)sigsuspend(&sigmask); /* Until SIGALRM */ | |
248 | (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */ | |
249 | } | |
250 | ||
251 | static void | |
252 | millisleep(int msec) | |
253 | { | |
254 | struct itimerval itval; | |
255 | itval.it_interval.tv_sec = 0; | |
256 | itval.it_interval.tv_usec = 0; | |
257 | itval.it_value.tv_sec = msec/1000; | |
258 | itval.it_value.tv_usec = (msec % 1000) * 1000; | |
259 | milliwait(&itval); | |
260 | } | |
261 | ||
262 | ||
c55a77db PH |
263 | /************************************************* |
264 | * Scan file for RRs * | |
265 | *************************************************/ | |
266 | ||
267 | /* This function scans an open "zone file" for appropriate records, and adds | |
268 | any that are found to the output buffer. | |
269 | ||
270 | Arguments: | |
271 | f the input FILE | |
272 | zone the current zone name | |
273 | domain the domain we are looking for | |
274 | qtype the type of RR we want | |
275 | qtypelen the length of qtype | |
276 | pkptr points to the output buffer pointer; this is updated | |
277 | countptr points to the record count; this is updated | |
c55a77db PH |
278 | |
279 | Returns: 0 on success, else HOST_NOT_FOUND or NO_DATA or NO_RECOVERY or | |
280 | PASS_ON - the latter if a "PASS ON NOT FOUND" line is seen | |
281 | */ | |
282 | ||
283 | static int | |
284 | find_records(FILE *f, uschar *zone, uschar *domain, uschar *qtype, | |
4d4c2a9b | 285 | int qtypelen, uschar **pkptr, int *countptr, BOOL * dnssec) |
c55a77db PH |
286 | { |
287 | int yield = HOST_NOT_FOUND; | |
c55a77db PH |
288 | int domainlen = Ustrlen(domain); |
289 | BOOL pass_on_not_found = FALSE; | |
290 | tlist *typeptr; | |
291 | uschar *pk = *pkptr; | |
292 | uschar buffer[256]; | |
293 | uschar rrdomain[256]; | |
75e0e026 | 294 | uschar RRdomain[256]; |
c55a77db PH |
295 | |
296 | /* Decode the required type */ | |
297 | ||
298 | for (typeptr = type_list; typeptr->name != NULL; typeptr++) | |
299 | { if (Ustrcmp(typeptr->name, qtype) == 0) break; } | |
300 | if (typeptr->name == NULL) | |
301 | { | |
302 | fprintf(stderr, "fakens: unknown record type %s\n", qtype); | |
303 | return NO_RECOVERY; | |
304 | } | |
305 | ||
306 | rrdomain[0] = 0; /* No previous domain */ | |
307 | (void)fseek(f, 0, SEEK_SET); /* Start again at the beginning */ | |
308 | ||
b4161d10 | 309 | *dnssec = TRUE; /* cancelled by first nonsecure rec found */ |
4d4c2a9b | 310 | |
c55a77db PH |
311 | /* Scan for RRs */ |
312 | ||
313 | while (fgets(CS buffer, sizeof(buffer), f) != NULL) | |
314 | { | |
315 | uschar *rdlptr; | |
316 | uschar *p, *ep, *pp; | |
317 | BOOL found_cname = FALSE; | |
318 | int i, plen, value; | |
319 | int tvalue = typeptr->value; | |
320 | int qtlen = qtypelen; | |
4d4c2a9b | 321 | BOOL rr_sec = FALSE; |
846430d9 | 322 | int delay = 0; |
c55a77db PH |
323 | |
324 | p = buffer; | |
325 | while (isspace(*p)) p++; | |
326 | if (*p == 0 || *p == ';') continue; | |
327 | ||
4d4c2a9b | 328 | if (Ustrncmp(p, US"PASS ON NOT FOUND", 17) == 0) |
c55a77db PH |
329 | { |
330 | pass_on_not_found = TRUE; | |
331 | continue; | |
332 | } | |
333 | ||
334 | ep = buffer + Ustrlen(buffer); | |
335 | while (isspace(ep[-1])) ep--; | |
336 | *ep = 0; | |
337 | ||
338 | p = buffer; | |
846430d9 JH |
339 | for (;;) |
340 | { | |
341 | if (Ustrncmp(p, US"DNSSEC ", 7) == 0) /* tagged as secure */ | |
342 | { | |
343 | rr_sec = TRUE; | |
344 | p += 7; | |
345 | } | |
346 | else if (Ustrncmp(p, US"DELAY=", 6) == 0) /* delay beforee response */ | |
347 | { | |
348 | for (p += 6; *p >= '0' && *p <= '9'; p++) | |
349 | delay = delay*10 + *p - '0'; | |
350 | while (isspace(*p)) p++; | |
351 | } | |
352 | else | |
353 | break; | |
354 | } | |
4d4c2a9b | 355 | |
c55a77db PH |
356 | if (!isspace(*p)) |
357 | { | |
358 | uschar *pp = rrdomain; | |
75e0e026 PH |
359 | uschar *PP = RRdomain; |
360 | while (!isspace(*p)) | |
361 | { | |
362 | *pp++ = tolower(*p); | |
363 | *PP++ = *p++; | |
364 | } | |
365 | if (pp[-1] != '.') | |
366 | { | |
367 | Ustrcpy(pp, zone); | |
368 | Ustrcpy(PP, zone); | |
369 | } | |
370 | else | |
371 | { | |
372 | pp[-1] = 0; | |
373 | PP[-1] = 0; | |
374 | } | |
c55a77db PH |
375 | } |
376 | ||
377 | /* Compare domain names; first check for a wildcard */ | |
378 | ||
379 | if (rrdomain[0] == '*') | |
380 | { | |
381 | int restlen = Ustrlen(rrdomain) - 1; | |
382 | if (domainlen > restlen && | |
383 | Ustrcmp(domain + domainlen - restlen, rrdomain + 1) != 0) continue; | |
384 | } | |
385 | ||
386 | /* Not a wildcard RR */ | |
387 | ||
388 | else if (Ustrcmp(domain, rrdomain) != 0) continue; | |
389 | ||
390 | /* The domain matches */ | |
391 | ||
392 | if (yield == HOST_NOT_FOUND) yield = NO_DATA; | |
393 | ||
394 | /* Compare RR types; a CNAME record is always returned */ | |
395 | ||
396 | while (isspace(*p)) p++; | |
397 | ||
398 | if (Ustrncmp(p, "CNAME", 5) == 0) | |
399 | { | |
400 | tvalue = ns_t_cname; | |
401 | qtlen = 5; | |
402 | found_cname = TRUE; | |
403 | } | |
404 | else if (Ustrncmp(p, qtype, qtypelen) != 0 || !isspace(p[qtypelen])) continue; | |
405 | ||
406 | /* Found a relevant record */ | |
407 | ||
846430d9 JH |
408 | if (delay) |
409 | millisleep(delay); | |
410 | ||
4d4c2a9b JH |
411 | if (!rr_sec) |
412 | *dnssec = FALSE; /* cancel AD return */ | |
413 | ||
c55a77db PH |
414 | yield = 0; |
415 | *countptr = *countptr + 1; | |
416 | ||
417 | p += qtlen; | |
418 | while (isspace(*p)) p++; | |
419 | ||
75e0e026 PH |
420 | /* For a wildcard record, use the search name; otherwise use the record's |
421 | name in its original case because it might contain upper case letters. */ | |
422 | ||
423 | pk = packname((rrdomain[0] == '*')? domain : RRdomain, pk); | |
c55a77db PH |
424 | *pk++ = (tvalue >> 8) & 255; |
425 | *pk++ = (tvalue) & 255; | |
426 | *pk++ = 0; | |
427 | *pk++ = 1; /* class = IN */ | |
428 | ||
429 | pk += 4; /* TTL field; don't care */ | |
430 | ||
431 | rdlptr = pk; /* remember rdlength field */ | |
432 | pk += 2; | |
433 | ||
434 | /* The rest of the data depends on the type */ | |
435 | ||
436 | switch (tvalue) | |
437 | { | |
438 | case ns_t_soa: /* Not currently used */ | |
439 | break; | |
440 | ||
441 | case ns_t_a: | |
442 | for (i = 0; i < 4; i++) | |
443 | { | |
444 | value = 0; | |
445 | while (isdigit(*p)) value = value*10 + *p++ - '0'; | |
446 | *pk++ = value; | |
447 | p++; | |
448 | } | |
449 | break; | |
450 | ||
451 | /* The only occurrence of a double colon is for ::1 */ | |
452 | case ns_t_aaaa: | |
453 | if (Ustrcmp(p, "::1") == 0) | |
454 | { | |
455 | memset(pk, 0, 15); | |
456 | pk += 15; | |
457 | *pk++ = 1; | |
458 | } | |
459 | else for (i = 0; i < 8; i++) | |
460 | { | |
461 | value = 0; | |
462 | while (isxdigit(*p)) | |
463 | { | |
464 | value = value * 16 + toupper(*p) - (isdigit(*p)? '0' : '7'); | |
465 | p++; | |
466 | } | |
467 | *pk++ = (value >> 8) & 255; | |
468 | *pk++ = value & 255; | |
469 | p++; | |
470 | } | |
471 | break; | |
472 | ||
473 | case ns_t_mx: | |
b4161d10 | 474 | pk = shortfield(&p, pk); |
42ec9880 | 475 | if (ep[-1] != '.') sprintf(CS ep, "%s.", zone); |
75e0e026 PH |
476 | pk = packname(p, pk); |
477 | plen = Ustrlen(p); | |
478 | break; | |
c55a77db PH |
479 | |
480 | case ns_t_txt: | |
481 | pp = pk++; | |
482 | if (*p == '"') p++; /* Should always be the case */ | |
483 | while (*p != 0 && *p != '"') *pk++ = *p++; | |
484 | *pp = pk - pp - 1; | |
485 | break; | |
486 | ||
b4161d10 | 487 | case ns_t_tlsa: |
36b894a6 JH |
488 | pk = bytefield(&p, pk); /* usage */ |
489 | pk = bytefield(&p, pk); /* selector */ | |
490 | pk = bytefield(&p, pk); /* match type */ | |
b4161d10 JH |
491 | while (isxdigit(*p)) |
492 | { | |
493 | value = toupper(*p) - (isdigit(*p) ? '0' : '7') << 4; | |
494 | if (isxdigit(*++p)) | |
495 | { | |
496 | value |= toupper(*p) - (isdigit(*p) ? '0' : '7'); | |
497 | p++; | |
498 | } | |
499 | *pk++ = value & 255; | |
500 | } | |
501 | ||
502 | break; | |
503 | ||
c55a77db PH |
504 | case ns_t_srv: |
505 | for (i = 0; i < 3; i++) | |
506 | { | |
507 | value = 0; | |
508 | while (isdigit(*p)) value = value*10 + *p++ - '0'; | |
509 | while (isspace(*p)) p++; | |
510 | *pk++ = (value >> 8) & 255; | |
511 | *pk++ = value & 255; | |
512 | } | |
513 | ||
514 | /* Fall through */ | |
515 | ||
516 | case ns_t_cname: | |
517 | case ns_t_ns: | |
518 | case ns_t_ptr: | |
42ec9880 | 519 | if (ep[-1] != '.') sprintf(CS ep, "%s.", zone); |
c55a77db PH |
520 | pk = packname(p, pk); |
521 | plen = Ustrlen(p); | |
c55a77db PH |
522 | break; |
523 | } | |
524 | ||
525 | /* Fill in the length, and we are done with this RR */ | |
526 | ||
527 | rdlptr[0] = ((pk - rdlptr - 2) >> 8) & 255; | |
528 | rdlptr[1] = (pk -rdlptr - 2) & 255; | |
c55a77db PH |
529 | } |
530 | ||
531 | *pkptr = pk; | |
532 | return (yield == HOST_NOT_FOUND && pass_on_not_found)? PASS_ON : yield; | |
533 | } | |
534 | ||
535 | ||
846430d9 JH |
536 | static void |
537 | alarmfn(int sig) | |
538 | { | |
539 | } | |
c55a77db PH |
540 | |
541 | /************************************************* | |
542 | * Entry point and main program * | |
543 | *************************************************/ | |
544 | ||
545 | int | |
546 | main(int argc, char **argv) | |
547 | { | |
548 | FILE *f; | |
549 | DIR *d; | |
75e0e026 | 550 | int domlen, qtypelen; |
c55a77db PH |
551 | int yield, count; |
552 | int i; | |
553 | int zonecount = 0; | |
c55a77db | 554 | struct dirent *de; |
c55a77db PH |
555 | zoneitem zones[32]; |
556 | uschar *qualify = NULL; | |
557 | uschar *p, *zone; | |
558 | uschar *zonefile = NULL; | |
559 | uschar domain[256]; | |
560 | uschar buffer[256]; | |
561 | uschar qtype[12]; | |
562 | uschar packet[512]; | |
563 | uschar *pk = packet; | |
4d4c2a9b | 564 | BOOL dnssec; |
c55a77db | 565 | |
846430d9 JH |
566 | signal(SIGALRM, alarmfn); |
567 | ||
c55a77db PH |
568 | if (argc != 4) |
569 | { | |
570 | fprintf(stderr, "fakens: expected 3 arguments, received %d\n", argc-1); | |
571 | return NO_RECOVERY; | |
572 | } | |
573 | ||
574 | /* Find the zones */ | |
575 | ||
42ec9880 | 576 | (void)sprintf(CS buffer, "%s/../dnszones", argv[1]); |
c55a77db PH |
577 | |
578 | d = opendir(CCS buffer); | |
579 | if (d == NULL) | |
580 | { | |
581 | fprintf(stderr, "fakens: failed to opendir %s: %s\n", buffer, | |
582 | strerror(errno)); | |
583 | return NO_RECOVERY; | |
584 | } | |
585 | ||
586 | while ((de = readdir(d)) != NULL) | |
587 | { | |
e265af1f | 588 | uschar *name = US de->d_name; |
c55a77db PH |
589 | if (Ustrncmp(name, "qualify.", 8) == 0) |
590 | { | |
e265af1f | 591 | qualify = fcopystring(US "%s", name + 7); |
c55a77db PH |
592 | continue; |
593 | } | |
594 | if (Ustrncmp(name, "db.", 3) != 0) continue; | |
595 | if (Ustrncmp(name + 3, "ip4.", 4) == 0) | |
e265af1f | 596 | zones[zonecount].zone = fcopystring(US "%s.in-addr.arpa", name + 6); |
c55a77db | 597 | else if (Ustrncmp(name + 3, "ip6.", 4) == 0) |
e265af1f | 598 | zones[zonecount].zone = fcopystring(US "%s.ip6.arpa", name + 6); |
c55a77db | 599 | else |
e265af1f JH |
600 | zones[zonecount].zone = fcopystring(US "%s", name + 2); |
601 | zones[zonecount++].zonefile = fcopystring(US "%s", name); | |
c55a77db PH |
602 | } |
603 | (void)closedir(d); | |
604 | ||
605 | /* Get the RR type and upper case it, and check that we recognize it. */ | |
606 | ||
607 | Ustrncpy(qtype, argv[3], sizeof(qtype)); | |
608 | qtypelen = Ustrlen(qtype); | |
609 | for (p = qtype; *p != 0; p++) *p = toupper(*p); | |
610 | ||
611 | /* Find the domain, lower case it, check that it is in a zone that we handle, | |
612 | and set up the zone file name. The zone names in the table all start with a | |
613 | dot. */ | |
614 | ||
615 | domlen = Ustrlen(argv[2]); | |
616 | if (argv[2][domlen-1] == '.') domlen--; | |
617 | Ustrncpy(domain, argv[2], domlen); | |
618 | domain[domlen] = 0; | |
619 | for (i = 0; i < domlen; i++) domain[i] = tolower(domain[i]); | |
620 | ||
621 | if (Ustrchr(domain, '.') == NULL && qualify != NULL && | |
622 | Ustrcmp(domain, "dontqualify") != 0) | |
623 | { | |
624 | Ustrcat(domain, qualify); | |
625 | domlen += Ustrlen(qualify); | |
626 | } | |
627 | ||
628 | for (i = 0; i < zonecount; i++) | |
629 | { | |
630 | int zlen; | |
631 | zone = zones[i].zone; | |
632 | zlen = Ustrlen(zone); | |
633 | if (Ustrcmp(domain, zone+1) == 0 || (domlen >= zlen && | |
634 | Ustrcmp(domain + domlen - zlen, zone) == 0)) | |
635 | { | |
636 | zonefile = zones[i].zonefile; | |
637 | break; | |
638 | } | |
639 | } | |
640 | ||
641 | if (zonefile == NULL) | |
642 | { | |
643 | fprintf(stderr, "fakens: query not in faked zone: domain is: %s\n", domain); | |
644 | return PASS_ON; | |
645 | } | |
646 | ||
42ec9880 | 647 | (void)sprintf(CS buffer, "%s/../dnszones/%s", argv[1], zonefile); |
c55a77db PH |
648 | |
649 | /* Initialize the start of the response packet. We don't have to fake up | |
650 | everything, because we know that Exim will look only at the answer and | |
651 | additional section parts. */ | |
652 | ||
653 | memset(packet, 0, 12); | |
654 | pk += 12; | |
655 | ||
656 | /* Open the zone file. */ | |
657 | ||
42ec9880 | 658 | f = fopen(CS buffer, "r"); |
c55a77db PH |
659 | if (f == NULL) |
660 | { | |
661 | fprintf(stderr, "fakens: failed to open %s: %s\n", buffer, strerror(errno)); | |
662 | return NO_RECOVERY; | |
663 | } | |
664 | ||
665 | /* Find the records we want, and add them to the result. */ | |
666 | ||
667 | count = 0; | |
4d4c2a9b | 668 | yield = find_records(f, zone, domain, qtype, qtypelen, &pk, &count, &dnssec); |
c55a77db PH |
669 | if (yield == NO_RECOVERY) goto END_OFF; |
670 | ||
671 | packet[6] = (count >> 8) & 255; | |
672 | packet[7] = count & 255; | |
673 | ||
75e0e026 PH |
674 | /* There is no need to return any additional records because Exim no longer |
675 | (from release 4.61) makes any use of them. */ | |
c55a77db | 676 | |
75e0e026 PH |
677 | packet[10] = 0; |
678 | packet[11] = 0; | |
c55a77db | 679 | |
4d4c2a9b JH |
680 | if (dnssec) |
681 | ((HEADER *)packet)->ad = 1; | |
682 | ||
c55a77db PH |
683 | /* Close the zone file, write the result, and return. */ |
684 | ||
685 | END_OFF: | |
686 | (void)fclose(f); | |
687 | (void)fwrite(packet, 1, pk - packet, stdout); | |
688 | return yield; | |
689 | } | |
690 | ||
4d4c2a9b JH |
691 | /* vi: aw ai sw=2 |
692 | */ | |
c55a77db | 693 | /* End of fakens.c */ |