1 | /* DNS test framework and libresolv redirection. |
2 | Copyright (C) 2016-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <support/resolv_test.h> |
20 | |
21 | #include <arpa/inet.h> |
22 | #include <errno.h> |
23 | #include <fcntl.h> |
24 | #include <nss.h> |
25 | #include <resolv.h> |
26 | #include <search.h> |
27 | #include <stdlib.h> |
28 | #include <string.h> |
29 | #include <support/check.h> |
30 | #include <support/namespace.h> |
31 | #include <support/support.h> |
32 | #include <support/test-driver.h> |
33 | #include <support/xsocket.h> |
34 | #include <support/xthread.h> |
35 | #include <support/xunistd.h> |
36 | #include <sys/uio.h> |
37 | #include <unistd.h> |
38 | |
39 | /* Response builder. */ |
40 | |
41 | enum |
42 | { |
43 | max_response_length = 65536 |
44 | }; |
45 | |
46 | /* Used for locating domain names containing for the purpose of |
47 | forming compression references. */ |
48 | struct compressed_name |
49 | { |
50 | uint16_t offset; |
51 | unsigned char length; |
52 | unsigned char name[]; /* Without terminating NUL. */ |
53 | }; |
54 | |
55 | static struct compressed_name * |
56 | allocate_compressed_name (const unsigned char *encoded, unsigned int offset) |
57 | { |
58 | /* Compute the length of the domain name. */ |
59 | size_t length; |
60 | { |
61 | const unsigned char *p; |
62 | for (p = encoded; *p != '\0';) |
63 | { |
64 | /* No compression references are allowed. */ |
65 | TEST_VERIFY (*p <= 63); |
66 | /* Skip over the label. */ |
67 | p += 1 + *p; |
68 | } |
69 | length = p - encoded; |
70 | ++length; /* For the terminating NUL byte. */ |
71 | } |
72 | TEST_VERIFY_EXIT (length <= 255); |
73 | |
74 | struct compressed_name *result |
75 | = xmalloc (offsetof (struct compressed_name, name) + length); |
76 | result->offset = offset; |
77 | result->length = length; |
78 | memcpy (dest: result->name, src: encoded, n: length); |
79 | return result; |
80 | } |
81 | |
82 | /* Convert CH to lower case. Only change letters in the ASCII |
83 | range. */ |
84 | static inline unsigned char |
85 | ascii_tolower (unsigned char ch) |
86 | { |
87 | if ('A' <= ch && ch <= 'Z') |
88 | return ch - 'A' + 'a'; |
89 | else |
90 | return ch; |
91 | } |
92 | |
93 | /* Compare both names, for use with tsearch. The order is arbitrary, |
94 | but the comparison is case-insensitive. */ |
95 | static int |
96 | compare_compressed_name (const void *left, const void *right) |
97 | { |
98 | const struct compressed_name *crleft = left; |
99 | const struct compressed_name *crright = right; |
100 | |
101 | if (crleft->length != crright->length) |
102 | /* The operands are converted to int before the subtraction. */ |
103 | return crleft->length - crright->length; |
104 | |
105 | const unsigned char *nameleft = crleft->name; |
106 | const unsigned char *nameright = crright->name; |
107 | |
108 | while (true) |
109 | { |
110 | int lenleft = *nameleft++; |
111 | int lenright = *nameright++; |
112 | |
113 | /* Labels must not e compression references. */ |
114 | TEST_VERIFY (lenleft <= 63); |
115 | TEST_VERIFY (lenright <= 63); |
116 | |
117 | if (lenleft != lenright) |
118 | return left - right; |
119 | if (lenleft == 0) |
120 | /* End of name reached without spotting a difference. */ |
121 | return 0; |
122 | /* Compare the label in a case-insensitive manner. */ |
123 | const unsigned char *endnameleft = nameleft + lenleft; |
124 | while (nameleft < endnameleft) |
125 | { |
126 | int l = *nameleft++; |
127 | int r = *nameright++; |
128 | if (l != r) |
129 | { |
130 | l = ascii_tolower (ch: l); |
131 | r = ascii_tolower (ch: r); |
132 | if (l != r) |
133 | return l - r; |
134 | } |
135 | } |
136 | } |
137 | } |
138 | |
139 | struct resolv_response_builder |
140 | { |
141 | const unsigned char *query_buffer; |
142 | size_t query_length; |
143 | |
144 | size_t offset; /* Bytes written so far in buffer. */ |
145 | ns_sect section; /* Current section in the DNS packet. */ |
146 | unsigned int truncate_bytes; /* Bytes to remove at end of response. */ |
147 | bool drop; /* Discard generated response. */ |
148 | bool close; /* Close TCP client connection. */ |
149 | |
150 | /* Offset of the two-byte RDATA length field in the currently |
151 | written RDATA sub-structure. 0 if no RDATA is being written. */ |
152 | size_t current_rdata_offset; |
153 | |
154 | /* tsearch tree for locating targets for label compression. */ |
155 | void *compression_offsets; |
156 | |
157 | /* Must be last. Not zeroed for performance reasons. */ |
158 | unsigned char buffer[max_response_length]; |
159 | }; |
160 | |
161 | /* Response builder. */ |
162 | |
163 | void |
164 | resolv_response_init (struct resolv_response_builder *b, |
165 | struct resolv_response_flags flags) |
166 | { |
167 | if (b->offset > 0) |
168 | FAIL_EXIT1 ("response_init: called at offset %zu" , b->offset); |
169 | if (b->query_length < 12) |
170 | FAIL_EXIT1 ("response_init called for a query of size %zu" , |
171 | b->query_length); |
172 | if (flags.rcode > 15) |
173 | FAIL_EXIT1 ("response_init: invalid RCODE %u" , flags.rcode); |
174 | |
175 | /* Copy the transaction ID. */ |
176 | b->buffer[0] = b->query_buffer[0]; |
177 | b->buffer[1] = b->query_buffer[1]; |
178 | |
179 | /* Initialize the flags. */ |
180 | b->buffer[2] = 0x80; /* Mark as response. */ |
181 | b->buffer[2] |= b->query_buffer[2] & 0x01; /* Copy the RD bit. */ |
182 | if (flags.tc) |
183 | b->buffer[2] |= 0x02; |
184 | b->buffer[3] = flags.rcode; |
185 | if (!flags.clear_ra) |
186 | b->buffer[3] |= 0x80; |
187 | if (flags.ad) |
188 | b->buffer[3] |= 0x20; |
189 | |
190 | /* Fill in the initial section count values. */ |
191 | b->buffer[4] = flags.qdcount >> 8; |
192 | b->buffer[5] = flags.qdcount; |
193 | b->buffer[6] = flags.ancount >> 8; |
194 | b->buffer[7] = flags.ancount; |
195 | b->buffer[8] = flags.nscount >> 8; |
196 | b->buffer[9] = flags.nscount; |
197 | b->buffer[10] = flags.adcount >> 8; |
198 | b->buffer[11] = flags.adcount; |
199 | |
200 | b->offset = 12; |
201 | } |
202 | |
203 | void |
204 | resolv_response_section (struct resolv_response_builder *b, ns_sect section) |
205 | { |
206 | if (b->offset == 0) |
207 | FAIL_EXIT1 ("resolv_response_section: response_init not called before" ); |
208 | if (section < b->section) |
209 | FAIL_EXIT1 ("resolv_response_section: cannot go back to previous section" ); |
210 | b->section = section; |
211 | } |
212 | |
213 | /* Add a single byte to B. */ |
214 | static inline void |
215 | response_add_byte (struct resolv_response_builder *b, unsigned char ch) |
216 | { |
217 | if (b->offset == max_response_length) |
218 | FAIL_EXIT1 ("DNS response exceeds 64 KiB limit" ); |
219 | b->buffer[b->offset] = ch; |
220 | ++b->offset; |
221 | } |
222 | |
223 | /* Add a 16-bit word VAL to B, in big-endian format. */ |
224 | static void |
225 | response_add_16 (struct resolv_response_builder *b, uint16_t val) |
226 | { |
227 | response_add_byte (b, ch: val >> 8); |
228 | response_add_byte (b, ch: val); |
229 | } |
230 | |
231 | /* Increment the pers-section record counter in the packet header. */ |
232 | static void |
233 | response_count_increment (struct resolv_response_builder *b) |
234 | { |
235 | unsigned int offset = b->section; |
236 | offset = 4 + 2 * offset; |
237 | ++b->buffer[offset + 1]; |
238 | if (b->buffer[offset + 1] == 0) |
239 | { |
240 | /* Carry. */ |
241 | ++b->buffer[offset]; |
242 | if (b->buffer[offset] == 0) |
243 | /* Overflow. */ |
244 | FAIL_EXIT1 ("too many records in section" ); |
245 | } |
246 | } |
247 | |
248 | void |
249 | resolv_response_add_question (struct resolv_response_builder *b, |
250 | const char *name, uint16_t class, uint16_t type) |
251 | { |
252 | if (b->offset == 0) |
253 | FAIL_EXIT1 ("resolv_response_add_question: " |
254 | "resolv_response_init not called" ); |
255 | if (b->section != ns_s_qd) |
256 | FAIL_EXIT1 ("resolv_response_add_question: " |
257 | "must be called in the question section" ); |
258 | |
259 | resolv_response_add_name (b, name); |
260 | response_add_16 (b, val: type); |
261 | response_add_16 (b, val: class); |
262 | |
263 | response_count_increment (b); |
264 | } |
265 | |
266 | void |
267 | resolv_response_add_name (struct resolv_response_builder *b, |
268 | const char *const origname) |
269 | { |
270 | unsigned char encoded_name[NS_MAXDNAME]; |
271 | if (ns_name_pton (origname, encoded_name, sizeof (encoded_name)) < 0) |
272 | FAIL_EXIT1 ("ns_name_pton (\"%s\"): %m" , origname); |
273 | |
274 | /* Copy the encoded name into the output buffer, apply compression |
275 | where possible. */ |
276 | for (const unsigned char *name = encoded_name; ;) |
277 | { |
278 | if (*name == '\0') |
279 | { |
280 | /* We have reached the end of the name. Add the terminating |
281 | NUL byte. */ |
282 | response_add_byte (b, ch: '\0'); |
283 | break; |
284 | } |
285 | |
286 | /* Set to the compression target if compression is possible. */ |
287 | struct compressed_name *crname_target; |
288 | |
289 | /* Compression references can only reach the beginning of the |
290 | packet. */ |
291 | enum { compression_limit = 1 << 12 }; |
292 | |
293 | { |
294 | /* The trailing part of the name to be looked up in the tree |
295 | with the compression targets. */ |
296 | struct compressed_name *crname |
297 | = allocate_compressed_name (encoded: name, offset: b->offset); |
298 | |
299 | if (b->offset < compression_limit) |
300 | { |
301 | /* Add the name to the tree, for future compression |
302 | references. */ |
303 | void **ptr = tsearch (key: crname, rootp: &b->compression_offsets, |
304 | compar: compare_compressed_name); |
305 | if (ptr == NULL) |
306 | FAIL_EXIT1 ("tsearch out of memory" ); |
307 | crname_target = *ptr; |
308 | |
309 | if (crname_target != crname) |
310 | /* The new name was not actually added to the tree. |
311 | Deallocate it. */ |
312 | free (ptr: crname); |
313 | else |
314 | /* Signal that the tree did not yet contain the name, |
315 | but keep the allocation because it is now part of the |
316 | tree. */ |
317 | crname_target = NULL; |
318 | } |
319 | else |
320 | { |
321 | /* This name cannot be reached by a compression reference. |
322 | No need to add it to the tree for future reference. */ |
323 | void **ptr = tfind (key: crname, rootp: &b->compression_offsets, |
324 | compar: compare_compressed_name); |
325 | if (ptr != NULL) |
326 | crname_target = *ptr; |
327 | else |
328 | crname_target = NULL; |
329 | TEST_VERIFY (crname_target != crname); |
330 | /* Not added to the tree. */ |
331 | free (ptr: crname); |
332 | } |
333 | } |
334 | |
335 | if (crname_target != NULL) |
336 | { |
337 | /* The name is known. Reference the previous location. */ |
338 | unsigned int old_offset = crname_target->offset; |
339 | TEST_VERIFY_EXIT (old_offset < compression_limit); |
340 | response_add_byte (b, ch: 0xC0 | (old_offset >> 8)); |
341 | response_add_byte (b, ch: old_offset); |
342 | break; |
343 | } |
344 | else |
345 | { |
346 | /* The name is new. Add this label. */ |
347 | unsigned int len = 1 + *name; |
348 | resolv_response_add_data (b, name, len); |
349 | name += len; |
350 | } |
351 | } |
352 | } |
353 | |
354 | void |
355 | resolv_response_open_record (struct resolv_response_builder *b, |
356 | const char *name, |
357 | uint16_t class, uint16_t type, uint32_t ttl) |
358 | { |
359 | if (b->section == ns_s_qd) |
360 | FAIL_EXIT1 ("resolv_response_open_record called in question section" ); |
361 | if (b->current_rdata_offset != 0) |
362 | FAIL_EXIT1 ("resolv_response_open_record called with open record" ); |
363 | |
364 | resolv_response_add_name (b, origname: name); |
365 | response_add_16 (b, val: type); |
366 | response_add_16 (b, val: class); |
367 | response_add_16 (b, val: ttl >> 16); |
368 | response_add_16 (b, val: ttl); |
369 | |
370 | b->current_rdata_offset = b->offset; |
371 | /* Add room for the RDATA length. */ |
372 | response_add_16 (b, val: 0); |
373 | } |
374 | |
375 | |
376 | void |
377 | resolv_response_close_record (struct resolv_response_builder *b) |
378 | { |
379 | size_t rdata_offset = b->current_rdata_offset; |
380 | if (rdata_offset == 0) |
381 | FAIL_EXIT1 ("response_close_record called without open record" ); |
382 | size_t rdata_length = b->offset - rdata_offset - 2; |
383 | if (rdata_length > 65535) |
384 | FAIL_EXIT1 ("RDATA length %zu exceeds limit" , rdata_length); |
385 | b->buffer[rdata_offset] = rdata_length >> 8; |
386 | b->buffer[rdata_offset + 1] = rdata_length; |
387 | response_count_increment (b); |
388 | b->current_rdata_offset = 0; |
389 | } |
390 | |
391 | void |
392 | resolv_response_add_data (struct resolv_response_builder *b, |
393 | const void *data, size_t length) |
394 | { |
395 | size_t remaining = max_response_length - b->offset; |
396 | if (remaining < length) |
397 | FAIL_EXIT1 ("resolv_response_add_data: not enough room for %zu bytes" , |
398 | length); |
399 | memcpy (dest: b->buffer + b->offset, src: data, n: length); |
400 | b->offset += length; |
401 | } |
402 | |
403 | void |
404 | resolv_response_drop (struct resolv_response_builder *b) |
405 | { |
406 | b->drop = true; |
407 | } |
408 | |
409 | void |
410 | resolv_response_close (struct resolv_response_builder *b) |
411 | { |
412 | b->close = true; |
413 | } |
414 | |
415 | void |
416 | resolv_response_truncate_data (struct resolv_response_builder *b, size_t count) |
417 | { |
418 | if (count > 65535) |
419 | FAIL_EXIT1 ("resolv_response_truncate_data: argument too large: %zu" , |
420 | count); |
421 | b->truncate_bytes = count; |
422 | } |
423 | |
424 | |
425 | size_t |
426 | resolv_response_length (const struct resolv_response_builder *b) |
427 | { |
428 | return b->offset; |
429 | } |
430 | |
431 | unsigned char * |
432 | resolv_response_buffer (const struct resolv_response_builder *b) |
433 | { |
434 | unsigned char *result = xmalloc (n: b->offset); |
435 | memcpy (dest: result, src: b->buffer, n: b->offset); |
436 | return result; |
437 | } |
438 | |
439 | struct resolv_response_builder * |
440 | resolv_response_builder_allocate (const unsigned char *query_buffer, |
441 | size_t query_length) |
442 | { |
443 | struct resolv_response_builder *b = xmalloc (n: sizeof (*b)); |
444 | memset (s: b, c: 0, offsetof (struct resolv_response_builder, buffer)); |
445 | b->query_buffer = query_buffer; |
446 | b->query_length = query_length; |
447 | return b; |
448 | } |
449 | |
450 | void |
451 | resolv_response_builder_free (struct resolv_response_builder *b) |
452 | { |
453 | tdestroy (root: b->compression_offsets, freefct: free); |
454 | free (ptr: b); |
455 | } |
456 | |
457 | /* DNS query processing. */ |
458 | |
459 | /* Data extracted from the question section of a DNS packet. */ |
460 | struct query_info |
461 | { |
462 | char qname[MAXDNAME]; |
463 | uint16_t qclass; |
464 | uint16_t qtype; |
465 | struct resolv_edns_info edns; |
466 | }; |
467 | |
468 | /* Update *INFO from the specified DNS packet. */ |
469 | static void |
470 | parse_query (struct query_info *info, |
471 | const unsigned char *buffer, size_t length) |
472 | { |
473 | HEADER hd; |
474 | _Static_assert (sizeof (hd) == 12, "DNS header size" ); |
475 | if (length < sizeof (hd)) |
476 | FAIL_EXIT1 ("malformed DNS query: too short: %zu bytes" , length); |
477 | memcpy (dest: &hd, src: buffer, n: sizeof (hd)); |
478 | |
479 | if (ntohs (hd.qdcount) != 1) |
480 | FAIL_EXIT1 ("malformed DNS query: wrong question count: %d" , |
481 | (int) ntohs (hd.qdcount)); |
482 | if (ntohs (hd.ancount) != 0) |
483 | FAIL_EXIT1 ("malformed DNS query: wrong answer count: %d" , |
484 | (int) ntohs (hd.ancount)); |
485 | if (ntohs (hd.nscount) != 0) |
486 | FAIL_EXIT1 ("malformed DNS query: wrong authority count: %d" , |
487 | (int) ntohs (hd.nscount)); |
488 | if (ntohs (hd.arcount) > 1) |
489 | FAIL_EXIT1 ("malformed DNS query: wrong additional count: %d" , |
490 | (int) ntohs (hd.arcount)); |
491 | |
492 | int ret = dn_expand (buffer, buffer + length, buffer + sizeof (hd), |
493 | info->qname, sizeof (info->qname)); |
494 | if (ret < 0) |
495 | FAIL_EXIT1 ("malformed DNS query: cannot uncompress QNAME" ); |
496 | |
497 | /* Obtain QTYPE and QCLASS. */ |
498 | size_t remaining = length - (12 + ret); |
499 | struct |
500 | { |
501 | uint16_t qtype; |
502 | uint16_t qclass; |
503 | } qtype_qclass; |
504 | if (remaining < sizeof (qtype_qclass)) |
505 | FAIL_EXIT1 ("malformed DNS query: " |
506 | "query lacks QCLASS/QTYPE, QNAME: %s" , info->qname); |
507 | memcpy (dest: &qtype_qclass, src: buffer + 12 + ret, n: sizeof (qtype_qclass)); |
508 | info->qclass = ntohs (qtype_qclass.qclass); |
509 | info->qtype = ntohs (qtype_qclass.qtype); |
510 | |
511 | memset (s: &info->edns, c: 0, n: sizeof (info->edns)); |
512 | if (ntohs (hd.arcount) > 0) |
513 | { |
514 | /* Parse EDNS record. */ |
515 | struct __attribute__ ((packed, aligned (1))) |
516 | { |
517 | uint8_t root; |
518 | uint16_t rtype; |
519 | uint16_t payload; |
520 | uint8_t edns_extended_rcode; |
521 | uint8_t edns_version; |
522 | uint16_t flags; |
523 | uint16_t rdatalen; |
524 | } rr; |
525 | _Static_assert (sizeof (rr) == 11, "EDNS record size" ); |
526 | |
527 | if (remaining < 4 + sizeof (rr)) |
528 | FAIL_EXIT1 ("malformed DNS query: no room for EDNS record" ); |
529 | memcpy (dest: &rr, src: buffer + 12 + ret + 4, n: sizeof (rr)); |
530 | if (rr.root != 0) |
531 | FAIL_EXIT1 ("malformed DNS query: invalid OPT RNAME: %d\n" , rr.root); |
532 | if (rr.rtype != htons (41)) |
533 | FAIL_EXIT1 ("malformed DNS query: invalid OPT type: %d\n" , |
534 | ntohs (rr.rtype)); |
535 | info->edns.active = true; |
536 | info->edns.extended_rcode = rr.edns_extended_rcode; |
537 | info->edns.version = rr.edns_version; |
538 | info->edns.flags = ntohs (rr.flags); |
539 | info->edns.payload_size = ntohs (rr.payload); |
540 | } |
541 | } |
542 | |
543 | |
544 | /* Main testing framework. */ |
545 | |
546 | /* Per-server information. One struct is allocated for each test |
547 | server. */ |
548 | struct resolv_test_server |
549 | { |
550 | /* Local address of the server. UDP and TCP use the same port. */ |
551 | struct sockaddr_in address; |
552 | |
553 | /* File descriptor of the UDP server, or -1 if this server is |
554 | disabled. */ |
555 | int socket_udp; |
556 | |
557 | /* File descriptor of the TCP server, or -1 if this server is |
558 | disabled. */ |
559 | int socket_tcp; |
560 | |
561 | /* Counter of the number of responses processed so far. */ |
562 | size_t response_number; |
563 | |
564 | /* Thread handles for the server threads (if not disabled in the |
565 | configuration). */ |
566 | pthread_t thread_udp; |
567 | pthread_t thread_tcp; |
568 | }; |
569 | |
570 | /* Main struct for keeping track of libresolv redirection and |
571 | testing. */ |
572 | struct resolv_test |
573 | { |
574 | /* After initialization, any access to the struct must be performed |
575 | while this lock is acquired. */ |
576 | pthread_mutex_t lock; |
577 | |
578 | /* Data for each test server. */ |
579 | struct resolv_test_server servers[resolv_max_test_servers]; |
580 | |
581 | /* Used if config.single_thread_udp is true. */ |
582 | pthread_t thread_udp_single; |
583 | |
584 | struct resolv_redirect_config config; |
585 | bool termination_requested; |
586 | }; |
587 | |
588 | /* Function implementing a server thread. */ |
589 | typedef void (*thread_callback) (struct resolv_test *, int server_index); |
590 | |
591 | /* Storage for thread-specific data, for passing to the |
592 | thread_callback function. */ |
593 | struct thread_closure |
594 | { |
595 | struct resolv_test *obj; /* Current test object. */ |
596 | thread_callback callback; /* Function to call. */ |
597 | int server_index; /* Index of the implemented server. */ |
598 | }; |
599 | |
600 | /* Wrap response_callback as a function which can be passed to |
601 | pthread_create. */ |
602 | static void * |
603 | thread_callback_wrapper (void *arg) |
604 | { |
605 | struct thread_closure *closure = arg; |
606 | closure->callback (closure->obj, closure->server_index); |
607 | free (ptr: closure); |
608 | return NULL; |
609 | } |
610 | |
611 | /* Start a server thread for the specified SERVER_INDEX, implemented |
612 | by CALLBACK. */ |
613 | static pthread_t |
614 | start_server_thread (struct resolv_test *obj, int server_index, |
615 | thread_callback callback) |
616 | { |
617 | struct thread_closure *closure = xmalloc (n: sizeof (*closure)); |
618 | *closure = (struct thread_closure) |
619 | { |
620 | .obj = obj, |
621 | .callback = callback, |
622 | .server_index = server_index, |
623 | }; |
624 | return xpthread_create (NULL, thread_func: thread_callback_wrapper, closure); |
625 | } |
626 | |
627 | /* Process one UDP query. Return false if a termination requested has |
628 | been detected. */ |
629 | static bool |
630 | server_thread_udp_process_one (struct resolv_test *obj, int server_index) |
631 | { |
632 | unsigned char query[512]; |
633 | struct sockaddr_storage peer; |
634 | socklen_t peerlen = sizeof (peer); |
635 | size_t length = xrecvfrom (obj->servers[server_index].socket_udp, |
636 | query, sizeof (query), 0, |
637 | (struct sockaddr *) &peer, &peerlen); |
638 | /* Check for termination. */ |
639 | { |
640 | bool termination_requested; |
641 | xpthread_mutex_lock (mutex: &obj->lock); |
642 | termination_requested = obj->termination_requested; |
643 | xpthread_mutex_unlock (mutex: &obj->lock); |
644 | if (termination_requested) |
645 | return false; |
646 | } |
647 | |
648 | |
649 | struct query_info qinfo; |
650 | parse_query (info: &qinfo, buffer: query, length); |
651 | if (test_verbose > 0) |
652 | { |
653 | if (test_verbose > 1) |
654 | printf (format: "info: UDP server %d: incoming query:" |
655 | " %zd bytes, %s/%u/%u, tnxid=0x%02x%02x\n" , |
656 | server_index, length, qinfo.qname, qinfo.qclass, qinfo.qtype, |
657 | query[0], query[1]); |
658 | else |
659 | printf (format: "info: UDP server %d: incoming query:" |
660 | " %zd bytes, %s/%u/%u\n" , |
661 | server_index, length, qinfo.qname, qinfo.qclass, qinfo.qtype); |
662 | } |
663 | |
664 | struct resolv_response_context ctx = |
665 | { |
666 | .test = obj, |
667 | .client_address = &peer, |
668 | .client_address_length = peerlen, |
669 | .query_buffer = query, |
670 | .query_length = length, |
671 | .server_index = server_index, |
672 | .tcp = false, |
673 | .edns = qinfo.edns, |
674 | }; |
675 | struct resolv_response_builder *b |
676 | = resolv_response_builder_allocate (query_buffer: query, query_length: length); |
677 | obj->config.response_callback |
678 | (&ctx, b, qinfo.qname, qinfo.qclass, qinfo.qtype); |
679 | |
680 | if (b->drop) |
681 | { |
682 | if (test_verbose) |
683 | printf (format: "info: UDP server %d: dropping response to %s/%u/%u\n" , |
684 | server_index, qinfo.qname, qinfo.qclass, qinfo.qtype); |
685 | } |
686 | else |
687 | { |
688 | if (test_verbose) |
689 | { |
690 | if (b->offset >= 12) |
691 | printf (format: "info: UDP server %d: sending response:" |
692 | " %zu bytes, RCODE %d (for %s/%u/%u)\n" , |
693 | ctx.server_index, b->offset, b->buffer[3] & 0x0f, |
694 | qinfo.qname, qinfo.qclass, qinfo.qtype); |
695 | else |
696 | printf (format: "info: UDP server %d: sending response: %zu bytes" |
697 | " (for %s/%u/%u)\n" , |
698 | server_index, b->offset, |
699 | qinfo.qname, qinfo.qclass, qinfo.qtype); |
700 | if (b->truncate_bytes > 0) |
701 | printf (format: "info: truncated by %u bytes\n" , b->truncate_bytes); |
702 | } |
703 | resolv_response_send_udp (&ctx, b); |
704 | } |
705 | resolv_response_builder_free (b); |
706 | return true; |
707 | } |
708 | |
709 | void |
710 | resolv_response_send_udp (const struct resolv_response_context *ctx, |
711 | struct resolv_response_builder *b) |
712 | { |
713 | TEST_VERIFY_EXIT (!ctx->tcp); |
714 | size_t to_send = b->offset; |
715 | if (to_send < b->truncate_bytes) |
716 | to_send = 0; |
717 | else |
718 | to_send -= b->truncate_bytes; |
719 | |
720 | /* Ignore most errors here because the other end may have closed |
721 | the socket. */ |
722 | if (sendto (fd: ctx->test->servers[ctx->server_index].socket_udp, |
723 | buf: b->buffer, n: to_send, flags: 0, |
724 | addr: ctx->client_address, addr_len: ctx->client_address_length) < 0) |
725 | TEST_VERIFY_EXIT (errno != EBADF); |
726 | } |
727 | |
728 | /* UDP thread_callback function. Variant for one thread per |
729 | server. */ |
730 | static void |
731 | server_thread_udp (struct resolv_test *obj, int server_index) |
732 | { |
733 | while (server_thread_udp_process_one (obj, server_index)) |
734 | ; |
735 | } |
736 | |
737 | /* Single-threaded UDP processing function, for the single_thread_udp |
738 | case. */ |
739 | static void * |
740 | server_thread_udp_single (void *closure) |
741 | { |
742 | struct resolv_test *obj = closure; |
743 | |
744 | struct pollfd fds[resolv_max_test_servers]; |
745 | for (int server_index = 0; server_index < resolv_max_test_servers; |
746 | ++server_index) |
747 | if (obj->config.servers[server_index].disable_udp) |
748 | fds[server_index] = (struct pollfd) {.fd = -1}; |
749 | else |
750 | { |
751 | fds[server_index] = (struct pollfd) |
752 | { |
753 | .fd = obj->servers[server_index].socket_udp, |
754 | .events = POLLIN |
755 | }; |
756 | |
757 | /* Make the socket non-blocking. */ |
758 | int flags = fcntl (fd: obj->servers[server_index].socket_udp, F_GETFL, 0); |
759 | if (flags < 0) |
760 | FAIL_EXIT1 ("fcntl (F_GETFL): %m" ); |
761 | flags |= O_NONBLOCK; |
762 | if (fcntl (fd: obj->servers[server_index].socket_udp, F_SETFL, flags) < 0) |
763 | FAIL_EXIT1 ("fcntl (F_SETFL): %m" ); |
764 | } |
765 | |
766 | while (true) |
767 | { |
768 | xpoll (fds, resolv_max_test_servers, -1); |
769 | for (int server_index = 0; server_index < resolv_max_test_servers; |
770 | ++server_index) |
771 | if (fds[server_index].revents != 0) |
772 | { |
773 | if (!server_thread_udp_process_one (obj, server_index)) |
774 | goto out; |
775 | fds[server_index].revents = 0; |
776 | } |
777 | } |
778 | |
779 | out: |
780 | return NULL; |
781 | } |
782 | |
783 | /* Start the single UDP handler thread (for the single_thread_udp |
784 | case). */ |
785 | static void |
786 | start_server_thread_udp_single (struct resolv_test *obj) |
787 | { |
788 | obj->thread_udp_single |
789 | = xpthread_create (NULL, thread_func: server_thread_udp_single, closure: obj); |
790 | } |
791 | |
792 | /* Data describing a TCP client connect. */ |
793 | struct tcp_thread_closure |
794 | { |
795 | struct resolv_test *obj; |
796 | int server_index; |
797 | int client_socket; |
798 | }; |
799 | |
800 | /* Read a complete DNS query packet. If EOF_OK, an immediate |
801 | end-of-file condition is acceptable. */ |
802 | static bool |
803 | read_fully (int fd, void *buf, size_t len, bool eof_ok) |
804 | { |
805 | const void *const end = buf + len; |
806 | while (buf < end) |
807 | { |
808 | ssize_t ret = read (fd: fd, buf: buf, nbytes: end - buf); |
809 | if (ret == 0) |
810 | { |
811 | if (!eof_ok) |
812 | { |
813 | support_record_failure (); |
814 | printf (format: "error: unexpected EOF on TCP connection\n" ); |
815 | } |
816 | return false; |
817 | } |
818 | else if (ret < 0) |
819 | { |
820 | if (!eof_ok || errno != ECONNRESET) |
821 | { |
822 | support_record_failure (); |
823 | printf (format: "error: TCP read: %m\n" ); |
824 | } |
825 | return false; |
826 | } |
827 | buf += ret; |
828 | eof_ok = false; |
829 | } |
830 | return true; |
831 | } |
832 | |
833 | /* Write an array of iovecs. Terminate the process on failure. */ |
834 | static void |
835 | writev_fully (int fd, struct iovec *buffers, size_t count) |
836 | { |
837 | while (count > 0) |
838 | { |
839 | /* Skip zero-length write requests. */ |
840 | if (buffers->iov_len == 0) |
841 | { |
842 | ++buffers; |
843 | --count; |
844 | continue; |
845 | } |
846 | /* Try to rewrite the remaining buffers. */ |
847 | ssize_t ret = writev (fd: fd, iovec: buffers, count: count); |
848 | if (ret < 0) |
849 | FAIL_EXIT1 ("writev: %m" ); |
850 | if (ret == 0) |
851 | FAIL_EXIT1 ("writev: invalid return value zero" ); |
852 | /* Find the buffers that were successfully written. */ |
853 | while (ret > 0) |
854 | { |
855 | if (count == 0) |
856 | FAIL_EXIT1 ("internal writev consistency failure" ); |
857 | /* Current buffer was partially written. */ |
858 | if (buffers->iov_len > (size_t) ret) |
859 | { |
860 | buffers->iov_base += ret; |
861 | buffers->iov_len -= ret; |
862 | ret = 0; |
863 | } |
864 | else |
865 | { |
866 | ret -= buffers->iov_len; |
867 | buffers->iov_len = 0; |
868 | ++buffers; |
869 | --count; |
870 | } |
871 | } |
872 | } |
873 | } |
874 | |
875 | /* Thread callback for handling a single established TCP connection to |
876 | a client. */ |
877 | static void * |
878 | server_thread_tcp_client (void *arg) |
879 | { |
880 | struct tcp_thread_closure *closure = arg; |
881 | |
882 | while (true) |
883 | { |
884 | /* Read packet length. */ |
885 | uint16_t query_length; |
886 | if (!read_fully (fd: closure->client_socket, |
887 | buf: &query_length, len: sizeof (query_length), true)) |
888 | break; |
889 | query_length = ntohs (query_length); |
890 | |
891 | /* Read the packet. */ |
892 | unsigned char *query_buffer = xmalloc (n: query_length); |
893 | read_fully (fd: closure->client_socket, buf: query_buffer, len: query_length, false); |
894 | |
895 | struct query_info qinfo; |
896 | parse_query (info: &qinfo, buffer: query_buffer, length: query_length); |
897 | if (test_verbose > 0) |
898 | { |
899 | if (test_verbose > 1) |
900 | printf (format: "info: UDP server %d: incoming query:" |
901 | " %d bytes, %s/%u/%u, tnxid=0x%02x%02x\n" , |
902 | closure->server_index, query_length, |
903 | qinfo.qname, qinfo.qclass, qinfo.qtype, |
904 | query_buffer[0], query_buffer[1]); |
905 | else |
906 | printf (format: "info: TCP server %d: incoming query:" |
907 | " %u bytes, %s/%u/%u\n" , |
908 | closure->server_index, query_length, |
909 | qinfo.qname, qinfo.qclass, qinfo.qtype); |
910 | } |
911 | |
912 | struct resolv_response_context ctx = |
913 | { |
914 | .test = closure->obj, |
915 | .query_buffer = query_buffer, |
916 | .query_length = query_length, |
917 | .server_index = closure->server_index, |
918 | .tcp = true, |
919 | .edns = qinfo.edns, |
920 | }; |
921 | struct resolv_response_builder *b |
922 | = resolv_response_builder_allocate (query_buffer, query_length); |
923 | closure->obj->config.response_callback |
924 | (&ctx, b, qinfo.qname, qinfo.qclass, qinfo.qtype); |
925 | |
926 | if (b->drop) |
927 | { |
928 | if (test_verbose) |
929 | printf (format: "info: TCP server %d: dropping response to %s/%u/%u\n" , |
930 | closure->server_index, |
931 | qinfo.qname, qinfo.qclass, qinfo.qtype); |
932 | } |
933 | else |
934 | { |
935 | if (test_verbose) |
936 | printf (format: "info: TCP server %d: sending response: %zu bytes" |
937 | " (for %s/%u/%u)\n" , |
938 | closure->server_index, b->offset, |
939 | qinfo.qname, qinfo.qclass, qinfo.qtype); |
940 | uint16_t length = htons (b->offset); |
941 | size_t to_send = b->offset; |
942 | if (to_send < b->truncate_bytes) |
943 | to_send = 0; |
944 | else |
945 | to_send -= b->truncate_bytes; |
946 | struct iovec buffers[2] = |
947 | { |
948 | {&length, sizeof (length)}, |
949 | {b->buffer, to_send} |
950 | }; |
951 | writev_fully (fd: closure->client_socket, buffers, count: 2); |
952 | } |
953 | bool close_flag = b->close; |
954 | resolv_response_builder_free (b); |
955 | free (ptr: query_buffer); |
956 | if (close_flag) |
957 | break; |
958 | } |
959 | |
960 | xclose (closure->client_socket); |
961 | free (ptr: closure); |
962 | return NULL; |
963 | } |
964 | |
965 | /* thread_callback for the TCP case. Accept connections and create a |
966 | new thread for each client. */ |
967 | static void |
968 | server_thread_tcp (struct resolv_test *obj, int server_index) |
969 | { |
970 | while (true) |
971 | { |
972 | /* Get the client connection. */ |
973 | int client_socket = xaccept |
974 | (obj->servers[server_index].socket_tcp, NULL, NULL); |
975 | |
976 | /* Check for termination. */ |
977 | xpthread_mutex_lock (mutex: &obj->lock); |
978 | if (obj->termination_requested) |
979 | { |
980 | xpthread_mutex_unlock (mutex: &obj->lock); |
981 | xclose (client_socket); |
982 | break; |
983 | } |
984 | xpthread_mutex_unlock (mutex: &obj->lock); |
985 | |
986 | /* Spawn a new thread for handling this connection. */ |
987 | struct tcp_thread_closure *closure = xmalloc (n: sizeof (*closure)); |
988 | *closure = (struct tcp_thread_closure) |
989 | { |
990 | .obj = obj, |
991 | .server_index = server_index, |
992 | .client_socket = client_socket, |
993 | }; |
994 | |
995 | pthread_t thr |
996 | = xpthread_create (NULL, thread_func: server_thread_tcp_client, closure); |
997 | /* TODO: We should keep track of this thread so that we can |
998 | block in resolv_test_end until it has exited. */ |
999 | xpthread_detach (thr); |
1000 | } |
1001 | } |
1002 | |
1003 | /* Create UDP and TCP server sockets. */ |
1004 | static void |
1005 | make_server_sockets (struct resolv_test_server *server) |
1006 | { |
1007 | while (true) |
1008 | { |
1009 | server->socket_udp = xsocket (AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
1010 | server->socket_tcp = xsocket (AF_INET, SOCK_STREAM, IPPROTO_TCP); |
1011 | |
1012 | /* Pick the address for the UDP socket. */ |
1013 | server->address = (struct sockaddr_in) |
1014 | { |
1015 | .sin_family = AF_INET, |
1016 | .sin_addr = {.s_addr = htonl (INADDR_LOOPBACK)} |
1017 | }; |
1018 | xbind (server->socket_udp, |
1019 | (struct sockaddr *)&server->address, sizeof (server->address)); |
1020 | |
1021 | /* Retrieve the address. */ |
1022 | socklen_t addrlen = sizeof (server->address); |
1023 | xgetsockname (server->socket_udp, |
1024 | (struct sockaddr *)&server->address, &addrlen); |
1025 | |
1026 | /* Bind the TCP socket to the same address. */ |
1027 | { |
1028 | int on = 1; |
1029 | xsetsockopt (server->socket_tcp, SOL_SOCKET, SO_REUSEADDR, |
1030 | &on, sizeof (on)); |
1031 | } |
1032 | if (bind (fd: server->socket_tcp, |
1033 | addr: (struct sockaddr *)&server->address, |
1034 | len: sizeof (server->address)) != 0) |
1035 | { |
1036 | /* Port collision. The UDP bind succeeded, but the TCP BIND |
1037 | failed. We assume here that the kernel will pick the |
1038 | next local UDP address randomly. */ |
1039 | if (errno == EADDRINUSE) |
1040 | { |
1041 | xclose (server->socket_udp); |
1042 | xclose (server->socket_tcp); |
1043 | continue; |
1044 | } |
1045 | FAIL_EXIT1 ("TCP bind: %m" ); |
1046 | } |
1047 | xlisten (server->socket_tcp, 5); |
1048 | break; |
1049 | } |
1050 | } |
1051 | |
1052 | /* Like make_server_sockets, but the caller supplies the address to |
1053 | use. */ |
1054 | static void |
1055 | make_server_sockets_for_address (struct resolv_test_server *server, |
1056 | const struct sockaddr *addr) |
1057 | { |
1058 | server->socket_udp = xsocket (AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
1059 | server->socket_tcp = xsocket (AF_INET, SOCK_STREAM, IPPROTO_TCP); |
1060 | |
1061 | if (addr->sa_family == AF_INET) |
1062 | server->address = *(const struct sockaddr_in *) addr; |
1063 | else |
1064 | /* We cannot store the server address in the socket. This should |
1065 | not matter if disable_redirect is used. */ |
1066 | server->address = (struct sockaddr_in) { .sin_family = 0, }; |
1067 | |
1068 | xbind (server->socket_udp, |
1069 | (struct sockaddr *)&server->address, sizeof (server->address)); |
1070 | xbind (server->socket_tcp, |
1071 | (struct sockaddr *)&server->address, sizeof (server->address)); |
1072 | xlisten (server->socket_tcp, 5); |
1073 | } |
1074 | |
1075 | /* One-time initialization of NSS. */ |
1076 | static void |
1077 | resolv_redirect_once (void) |
1078 | { |
1079 | /* Only use nss_dns. */ |
1080 | __nss_configure_lookup (dbname: "hosts" , string: "dns" ); |
1081 | __nss_configure_lookup (dbname: "networks" , string: "dns" ); |
1082 | /* Enter a network namespace for isolation and firewall state |
1083 | cleanup. The tests will still work if these steps fail, but they |
1084 | may be less reliable. */ |
1085 | support_become_root (); |
1086 | support_enter_network_namespace (); |
1087 | } |
1088 | pthread_once_t resolv_redirect_once_var = PTHREAD_ONCE_INIT; |
1089 | |
1090 | void |
1091 | resolv_test_init (void) |
1092 | { |
1093 | /* Perform one-time initialization of NSS. */ |
1094 | xpthread_once (guard: &resolv_redirect_once_var, func: resolv_redirect_once); |
1095 | } |
1096 | |
1097 | /* Copy the search path from CONFIG.search to the _res object. */ |
1098 | static void |
1099 | set_search_path (struct resolv_redirect_config config) |
1100 | { |
1101 | memset (_res.defdname, c: 0, n: sizeof (_res.defdname)); |
1102 | memset (_res.dnsrch, c: 0, n: sizeof (_res.dnsrch)); |
1103 | |
1104 | char *current = _res.defdname; |
1105 | char *end = current + sizeof (_res.defdname); |
1106 | |
1107 | for (unsigned int i = 0; |
1108 | i < sizeof (config.search) / sizeof (config.search[0]); ++i) |
1109 | { |
1110 | if (config.search[i] == NULL) |
1111 | continue; |
1112 | |
1113 | size_t length = strlen (s: config.search[i]) + 1; |
1114 | size_t remaining = end - current; |
1115 | TEST_VERIFY_EXIT (length <= remaining); |
1116 | memcpy (dest: current, src: config.search[i], n: length); |
1117 | _res.dnsrch[i] = current; |
1118 | current += length; |
1119 | } |
1120 | } |
1121 | |
1122 | struct resolv_test * |
1123 | resolv_test_start (struct resolv_redirect_config config) |
1124 | { |
1125 | /* Apply configuration defaults. */ |
1126 | if (config.nscount == 0) |
1127 | config.nscount = resolv_max_test_servers; |
1128 | |
1129 | struct resolv_test *obj = xmalloc (n: sizeof (*obj)); |
1130 | *obj = (struct resolv_test) { |
1131 | .config = config, |
1132 | .lock = PTHREAD_MUTEX_INITIALIZER, |
1133 | }; |
1134 | |
1135 | if (!config.disable_redirect) |
1136 | resolv_test_init (); |
1137 | |
1138 | /* Create all the servers, to reserve the necessary ports. */ |
1139 | for (int server_index = 0; server_index < config.nscount; ++server_index) |
1140 | if (config.disable_redirect && config.server_address_overrides != NULL) |
1141 | make_server_sockets_for_address |
1142 | (server: obj->servers + server_index, |
1143 | addr: config.server_address_overrides[server_index]); |
1144 | else |
1145 | make_server_sockets (server: obj->servers + server_index); |
1146 | |
1147 | /* Start server threads. Disable the server ports, as |
1148 | requested. */ |
1149 | for (int server_index = 0; server_index < config.nscount; ++server_index) |
1150 | { |
1151 | struct resolv_test_server *server = obj->servers + server_index; |
1152 | if (config.servers[server_index].disable_udp) |
1153 | { |
1154 | xclose (server->socket_udp); |
1155 | server->socket_udp = -1; |
1156 | } |
1157 | else if (!config.single_thread_udp) |
1158 | server->thread_udp = start_server_thread (obj, server_index, |
1159 | callback: server_thread_udp); |
1160 | if (config.servers[server_index].disable_tcp) |
1161 | { |
1162 | xclose (server->socket_tcp); |
1163 | server->socket_tcp = -1; |
1164 | } |
1165 | else |
1166 | server->thread_tcp = start_server_thread (obj, server_index, |
1167 | callback: server_thread_tcp); |
1168 | } |
1169 | if (config.single_thread_udp) |
1170 | start_server_thread_udp_single (obj); |
1171 | |
1172 | if (config.disable_redirect) |
1173 | return obj; |
1174 | |
1175 | int timeout = 1; |
1176 | |
1177 | /* Initialize libresolv. */ |
1178 | TEST_VERIFY_EXIT (res_init () == 0); |
1179 | |
1180 | /* Disable IPv6 name server addresses. The code below only |
1181 | overrides the IPv4 addresses. */ |
1182 | __res_iclose (statp: &_res, true); |
1183 | _res._u._ext.nscount = 0; |
1184 | |
1185 | /* Redirect queries to the server socket. */ |
1186 | if (test_verbose) |
1187 | { |
1188 | printf (format: "info: old timeout value: %d\n" , _res.retrans); |
1189 | printf (format: "info: old retry attempt value: %d\n" , _res.retry); |
1190 | printf (format: "info: old _res.options: 0x%lx\n" , _res.options); |
1191 | printf (format: "info: old _res.nscount value: %d\n" , _res.nscount); |
1192 | printf (format: "info: old _res.ndots value: %d\n" , _res.ndots); |
1193 | } |
1194 | _res.retrans = timeout; |
1195 | _res.retry = 4; |
1196 | _res.nscount = config.nscount; |
1197 | _res.options = RES_INIT | RES_RECURSE | RES_DEFNAMES | RES_DNSRCH; |
1198 | _res.ndots = 1; |
1199 | if (test_verbose) |
1200 | { |
1201 | printf (format: "info: new timeout value: %d\n" , _res.retrans); |
1202 | printf (format: "info: new retry attempt value: %d\n" , _res.retry); |
1203 | printf (format: "info: new _res.options: 0x%lx\n" , _res.options); |
1204 | printf (format: "info: new _res.nscount value: %d\n" , _res.nscount); |
1205 | printf (format: "info: new _res.ndots value: %d\n" , _res.ndots); |
1206 | } |
1207 | for (int server_index = 0; server_index < config.nscount; ++server_index) |
1208 | { |
1209 | TEST_VERIFY_EXIT (obj->servers[server_index].address.sin_port != 0); |
1210 | _res.nsaddr_list[server_index] = obj->servers[server_index].address; |
1211 | if (test_verbose) |
1212 | { |
1213 | char buf[256]; |
1214 | TEST_VERIFY_EXIT |
1215 | (inet_ntop (AF_INET, &obj->servers[server_index].address.sin_addr, |
1216 | buf, sizeof (buf)) != NULL); |
1217 | printf (format: "info: server %d: %s/%u\n" , |
1218 | server_index, buf, |
1219 | htons (obj->servers[server_index].address.sin_port)); |
1220 | } |
1221 | } |
1222 | |
1223 | set_search_path (config); |
1224 | |
1225 | return obj; |
1226 | } |
1227 | |
1228 | void |
1229 | resolv_test_end (struct resolv_test *obj) |
1230 | { |
1231 | res_close (); |
1232 | |
1233 | xpthread_mutex_lock (mutex: &obj->lock); |
1234 | obj->termination_requested = true; |
1235 | xpthread_mutex_unlock (mutex: &obj->lock); |
1236 | |
1237 | /* Send trigger packets to unblock the server threads. */ |
1238 | for (int server_index = 0; server_index < obj->config.nscount; |
1239 | ++server_index) |
1240 | { |
1241 | if (!obj->config.servers[server_index].disable_udp) |
1242 | { |
1243 | int sock = xsocket (AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
1244 | xsendto (sock, "" , 1, 0, |
1245 | (struct sockaddr *) &obj->servers[server_index].address, |
1246 | sizeof (obj->servers[server_index].address)); |
1247 | xclose (sock); |
1248 | } |
1249 | if (!obj->config.servers[server_index].disable_tcp) |
1250 | { |
1251 | int sock = xsocket (AF_INET, SOCK_STREAM, IPPROTO_TCP); |
1252 | xconnect (sock, |
1253 | (struct sockaddr *) &obj->servers[server_index].address, |
1254 | sizeof (obj->servers[server_index].address)); |
1255 | xclose (sock); |
1256 | } |
1257 | } |
1258 | |
1259 | if (obj->config.single_thread_udp) |
1260 | xpthread_join (thr: obj->thread_udp_single); |
1261 | |
1262 | /* Wait for the server threads to terminate. */ |
1263 | for (int server_index = 0; server_index < obj->config.nscount; |
1264 | ++server_index) |
1265 | { |
1266 | if (!obj->config.servers[server_index].disable_udp) |
1267 | { |
1268 | if (!obj->config.single_thread_udp) |
1269 | xpthread_join (thr: obj->servers[server_index].thread_udp); |
1270 | xclose (obj->servers[server_index].socket_udp); |
1271 | } |
1272 | if (!obj->config.servers[server_index].disable_tcp) |
1273 | { |
1274 | xpthread_join (thr: obj->servers[server_index].thread_tcp); |
1275 | xclose (obj->servers[server_index].socket_tcp); |
1276 | } |
1277 | } |
1278 | |
1279 | free (ptr: obj); |
1280 | } |
1281 | |