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