1 /*
2 +----------------------------------------------------------------------+
3 | Copyright (c) The PHP Group |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | https://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Authors: The typical suspects |
14 | Pollita <pollita@php.net> |
15 | Marcus Boerger <helly@php.net> |
16 +----------------------------------------------------------------------+
17 */
18
19 /* {{{ includes */
20 #include "php.h"
21 #include "php_network.h"
22
23 #ifdef HAVE_SYS_SOCKET_H
24 #include <sys/socket.h>
25 #endif
26
27 #ifdef PHP_WIN32
28 # include "win32/inet.h"
29 # include <winsock2.h>
30 # include <windows.h>
31 # include <Ws2tcpip.h>
32 #else
33 #include <netinet/in.h>
34 #ifdef HAVE_ARPA_INET_H
35 #include <arpa/inet.h>
36 #endif
37 #include <netdb.h>
38 #ifdef _OSD_POSIX
39 #undef STATUS
40 #undef T_UNSPEC
41 #endif
42 #ifdef HAVE_ARPA_NAMESER_H
43 #ifdef DARWIN
44 # define BIND_8_COMPAT 1
45 #endif
46 #include <arpa/nameser.h>
47 #endif
48 #ifdef HAVE_RESOLV_H
49 #include <resolv.h>
50 #if defined(__HAIKU__)
51 extern void __res_ndestroy(res_state statp);
52 #define res_ndestroy __res_ndestroy
53 #endif
54 #endif
55 #ifdef HAVE_DNS_H
56 #include <dns.h>
57 #endif
58 #endif
59
60 #ifndef MAXHOSTNAMELEN
61 #define MAXHOSTNAMELEN 255
62 #endif
63
64 /* For the local hostname obtained via gethostname which is different from the
65 dns-related MAXHOSTNAMELEN constant above */
66 #ifndef HOST_NAME_MAX
67 #define HOST_NAME_MAX 255
68 #endif
69
70 #include "php_dns.h"
71
72 /* type compat */
73 #ifndef DNS_T_A
74 #define DNS_T_A 1
75 #endif
76 #ifndef DNS_T_NS
77 #define DNS_T_NS 2
78 #endif
79 #ifndef DNS_T_CNAME
80 #define DNS_T_CNAME 5
81 #endif
82 #ifndef DNS_T_SOA
83 #define DNS_T_SOA 6
84 #endif
85 #ifndef DNS_T_PTR
86 #define DNS_T_PTR 12
87 #endif
88 #ifndef DNS_T_HINFO
89 #define DNS_T_HINFO 13
90 #endif
91 #ifndef DNS_T_MINFO
92 #define DNS_T_MINFO 14
93 #endif
94 #ifndef DNS_T_MX
95 #define DNS_T_MX 15
96 #endif
97 #ifndef DNS_T_TXT
98 #define DNS_T_TXT 16
99 #endif
100 #ifndef DNS_T_AAAA
101 #define DNS_T_AAAA 28
102 #endif
103 #ifndef DNS_T_SRV
104 #define DNS_T_SRV 33
105 #endif
106 #ifndef DNS_T_NAPTR
107 #define DNS_T_NAPTR 35
108 #endif
109 #ifndef DNS_T_A6
110 #define DNS_T_A6 38
111 #endif
112 #ifndef DNS_T_CAA
113 #define DNS_T_CAA 257
114 #endif
115
116 #ifndef DNS_T_ANY
117 #define DNS_T_ANY 255
118 #endif
119 /* }}} */
120
121 static zend_string *php_gethostbyaddr(char *ip);
122 static zend_string *php_gethostbyname(char *name);
123
124 #ifdef HAVE_GETHOSTNAME
125 /* {{{ Get the host name of the current machine */
PHP_FUNCTION(gethostname)126 PHP_FUNCTION(gethostname)
127 {
128 char buf[HOST_NAME_MAX + 1];
129
130 ZEND_PARSE_PARAMETERS_NONE();
131
132 if (gethostname(buf, sizeof(buf))) {
133 php_error_docref(NULL, E_WARNING, "Unable to fetch host [%d]: %s", errno, strerror(errno));
134 RETURN_FALSE;
135 }
136
137 RETURN_STRING(buf);
138 }
139 /* }}} */
140 #endif
141
142 /* TODO: Reimplement the gethostby* functions using the new winxp+ API, in dns_win32.c, then
143 we can have a dns.c, dns_unix.c and dns_win32.c instead of a messy dns.c full of #ifdef
144 */
145
146 /* {{{ Get the Internet host name corresponding to a given IP address */
PHP_FUNCTION(gethostbyaddr)147 PHP_FUNCTION(gethostbyaddr)
148 {
149 char *addr;
150 size_t addr_len;
151 zend_string *hostname;
152
153 ZEND_PARSE_PARAMETERS_START(1, 1)
154 Z_PARAM_PATH(addr, addr_len)
155 ZEND_PARSE_PARAMETERS_END();
156
157 hostname = php_gethostbyaddr(addr);
158
159 if (hostname == NULL) {
160 #if defined(HAVE_IPV6) && defined(HAVE_INET_PTON)
161 php_error_docref(NULL, E_WARNING, "Address is not a valid IPv4 or IPv6 address");
162 #else
163 php_error_docref(NULL, E_WARNING, "Address is not in a.b.c.d form");
164 #endif
165 RETVAL_FALSE;
166 } else {
167 RETVAL_STR(hostname);
168 }
169 }
170 /* }}} */
171
172 /* {{{ php_gethostbyaddr */
php_gethostbyaddr(char * ip)173 static zend_string *php_gethostbyaddr(char *ip)
174 {
175 #if defined(HAVE_IPV6) && defined(HAVE_INET_PTON)
176 struct sockaddr_in sa4;
177 struct sockaddr_in6 sa6;
178 char out[NI_MAXHOST];
179 memset(&sa4, 0, sizeof(struct sockaddr_in));
180 memset(&sa6, 0, sizeof(struct sockaddr_in6));
181
182 if (inet_pton(AF_INET6, ip, &sa6.sin6_addr)) {
183 sa6.sin6_family = AF_INET6;
184
185 if (getnameinfo((struct sockaddr *)&sa6, sizeof(sa6), out, sizeof(out), NULL, 0, NI_NAMEREQD) != 0) {
186 return zend_string_init(ip, strlen(ip), 0);
187 }
188 return zend_string_init(out, strlen(out), 0);
189 } else if (inet_pton(AF_INET, ip, &sa4.sin_addr)) {
190 sa4.sin_family = AF_INET;
191
192 if (getnameinfo((struct sockaddr *)&sa4, sizeof(sa4), out, sizeof(out), NULL, 0, NI_NAMEREQD) != 0) {
193 return zend_string_init(ip, strlen(ip), 0);
194 }
195 return zend_string_init(out, strlen(out), 0);
196 }
197 return NULL; /* not a valid IP */
198 #else
199 struct in_addr addr;
200 struct hostent *hp;
201
202 addr.s_addr = inet_addr(ip);
203
204 if (addr.s_addr == -1) {
205 return NULL;
206 }
207
208 hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
209
210 if (!hp || hp->h_name == NULL || hp->h_name[0] == '\0') {
211 return zend_string_init(ip, strlen(ip), 0);
212 }
213
214 return zend_string_init(hp->h_name, strlen(hp->h_name), 0);
215 #endif
216 }
217 /* }}} */
218
219 /* {{{ Get the IP address corresponding to a given Internet host name */
PHP_FUNCTION(gethostbyname)220 PHP_FUNCTION(gethostbyname)
221 {
222 char *hostname;
223 size_t hostname_len;
224
225 ZEND_PARSE_PARAMETERS_START(1, 1)
226 Z_PARAM_PATH(hostname, hostname_len)
227 ZEND_PARSE_PARAMETERS_END();
228
229 if (hostname_len > MAXFQDNLEN) {
230 /* name too long, protect from CVE-2015-0235 */
231 php_error_docref(NULL, E_WARNING, "Host name cannot be longer than %d characters", MAXFQDNLEN);
232 RETURN_STRINGL(hostname, hostname_len);
233 }
234
235 RETURN_STR(php_gethostbyname(hostname));
236 }
237 /* }}} */
238
239 /* {{{ Return a list of IP addresses that a given hostname resolves to. */
PHP_FUNCTION(gethostbynamel)240 PHP_FUNCTION(gethostbynamel)
241 {
242 char *hostname;
243 size_t hostname_len;
244 struct hostent *hp;
245 struct in_addr in;
246 int i;
247 #ifdef HAVE_INET_NTOP
248 char addr4[INET_ADDRSTRLEN];
249 #endif
250
251 ZEND_PARSE_PARAMETERS_START(1, 1)
252 Z_PARAM_PATH(hostname, hostname_len)
253 ZEND_PARSE_PARAMETERS_END();
254
255 if (hostname_len > MAXFQDNLEN) {
256 /* name too long, protect from CVE-2015-0235 */
257 php_error_docref(NULL, E_WARNING, "Host name cannot be longer than %d characters", MAXFQDNLEN);
258 RETURN_FALSE;
259 }
260
261 hp = php_network_gethostbyname(hostname);
262 if (!hp) {
263 RETURN_FALSE;
264 }
265
266 array_init(return_value);
267
268 for (i = 0;; i++) {
269 /* On macos h_addr_list entries may be misaligned. */
270 struct in_addr *h_addr_entry; /* Don't call this h_addr, it's a macro! */
271 memcpy(&h_addr_entry, &hp->h_addr_list[i], sizeof(struct in_addr *));
272 if (!h_addr_entry) {
273 return;
274 }
275
276 in = *h_addr_entry;
277 #ifdef HAVE_INET_NTOP
278 add_next_index_string(return_value, inet_ntop(AF_INET, &in, addr4, INET_ADDRSTRLEN));
279 #else
280 add_next_index_string(return_value, inet_ntoa(in));
281 #endif
282 }
283 }
284 /* }}} */
285
286 /* {{{ php_gethostbyname */
php_gethostbyname(char * name)287 static zend_string *php_gethostbyname(char *name)
288 {
289 struct hostent *hp;
290 struct in_addr *h_addr_0; /* Don't call this h_addr, it's a macro! */
291 struct in_addr in;
292 #ifdef HAVE_INET_NTOP
293 char addr4[INET_ADDRSTRLEN];
294 #endif
295 const char *address;
296
297 hp = php_network_gethostbyname(name);
298 if (!hp) {
299 return zend_string_init(name, strlen(name), 0);
300 }
301
302 /* On macos h_addr_list entries may be misaligned. */
303 memcpy(&h_addr_0, &hp->h_addr_list[0], sizeof(struct in_addr *));
304 if (!h_addr_0) {
305 return zend_string_init(name, strlen(name), 0);
306 }
307
308 memcpy(&in.s_addr, h_addr_0, sizeof(in.s_addr));
309
310 #ifdef HAVE_INET_NTOP
311 address = inet_ntop(AF_INET, &in, addr4, INET_ADDRSTRLEN);
312 #else
313 address = inet_ntoa(in);
314 #endif
315 return zend_string_init(address, strlen(address), 0);
316 }
317 /* }}} */
318
319 /* Note: These functions are defined in ext/standard/dns_win32.c for Windows! */
320 #if !defined(PHP_WIN32) && defined(HAVE_DNS_SEARCH_FUNC)
321
322 #ifndef HFIXEDSZ
323 #define HFIXEDSZ 12 /* fixed data in header <arpa/nameser.h> */
324 #endif /* HFIXEDSZ */
325
326 #ifndef QFIXEDSZ
327 #define QFIXEDSZ 4 /* fixed data in query <arpa/nameser.h> */
328 #endif /* QFIXEDSZ */
329
330 #undef MAXHOSTNAMELEN
331 #define MAXHOSTNAMELEN 1024
332
333 #ifndef MAXRESOURCERECORDS
334 #define MAXRESOURCERECORDS 64
335 #endif /* MAXRESOURCERECORDS */
336
337 typedef union {
338 HEADER qb1;
339 uint8_t qb2[65536];
340 } querybuf;
341
342 /* just a hack to free resources allocated by glibc in __res_nsend()
343 * See also:
344 * res_thread_freeres() in glibc/resolv/res_init.c
345 * __libc_res_nsend() in resolv/res_send.c
346 * */
347
348 #if defined(__GLIBC__) && !defined(HAVE_DEPRECATED_DNS_FUNCS)
349 #define php_dns_free_res(__res__) _php_dns_free_res(__res__)
_php_dns_free_res(struct __res_state * res)350 static void _php_dns_free_res(struct __res_state *res) { /* {{{ */
351 int ns;
352 for (ns = 0; ns < MAXNS; ns++) {
353 if (res->_u._ext.nsaddrs[ns] != NULL) {
354 free (res->_u._ext.nsaddrs[ns]);
355 res->_u._ext.nsaddrs[ns] = NULL;
356 }
357 }
358 } /* }}} */
359 #else
360 #define php_dns_free_res(__res__)
361 #endif
362
363 /* {{{ Check DNS records corresponding to a given Internet host name or IP address */
PHP_FUNCTION(dns_check_record)364 PHP_FUNCTION(dns_check_record)
365 {
366 HEADER *hp;
367 querybuf answer = {0};
368 char *hostname;
369 size_t hostname_len;
370 zend_string *rectype = NULL;
371 int type = DNS_T_MX, i;
372 #if defined(HAVE_DNS_SEARCH)
373 struct sockaddr_storage from;
374 uint32_t fromsize = sizeof(from);
375 dns_handle_t handle;
376 #elif defined(HAVE_RES_NSEARCH)
377 struct __res_state state;
378 struct __res_state *handle = &state;
379 #endif
380
381 ZEND_PARSE_PARAMETERS_START(1, 2)
382 Z_PARAM_STRING(hostname, hostname_len)
383 Z_PARAM_OPTIONAL
384 Z_PARAM_STR(rectype)
385 ZEND_PARSE_PARAMETERS_END();
386
387 if (hostname_len == 0) {
388 zend_argument_value_error(1, "cannot be empty");
389 RETURN_THROWS();
390 }
391
392 if (rectype) {
393 if (zend_string_equals_literal_ci(rectype, "A")) type = DNS_T_A;
394 else if (zend_string_equals_literal_ci(rectype, "NS")) type = DNS_T_NS;
395 else if (zend_string_equals_literal_ci(rectype, "MX")) type = DNS_T_MX;
396 else if (zend_string_equals_literal_ci(rectype, "PTR")) type = DNS_T_PTR;
397 else if (zend_string_equals_literal_ci(rectype, "ANY")) type = DNS_T_ANY;
398 else if (zend_string_equals_literal_ci(rectype, "SOA")) type = DNS_T_SOA;
399 else if (zend_string_equals_literal_ci(rectype, "CAA")) type = DNS_T_CAA;
400 else if (zend_string_equals_literal_ci(rectype, "TXT")) type = DNS_T_TXT;
401 else if (zend_string_equals_literal_ci(rectype, "CNAME")) type = DNS_T_CNAME;
402 else if (zend_string_equals_literal_ci(rectype, "AAAA")) type = DNS_T_AAAA;
403 else if (zend_string_equals_literal_ci(rectype, "SRV")) type = DNS_T_SRV;
404 else if (zend_string_equals_literal_ci(rectype, "NAPTR")) type = DNS_T_NAPTR;
405 else if (zend_string_equals_literal_ci(rectype, "A6")) type = DNS_T_A6;
406 else {
407 zend_argument_value_error(2, "must be a valid DNS record type");
408 RETURN_THROWS();
409 }
410 }
411
412 #if defined(HAVE_DNS_SEARCH)
413 handle = dns_open(NULL);
414 if (handle == NULL) {
415 RETURN_FALSE;
416 }
417 #elif defined(HAVE_RES_NSEARCH)
418 memset(&state, 0, sizeof(state));
419 if (res_ninit(handle)) {
420 RETURN_FALSE;
421 }
422 #else
423 res_init();
424 #endif
425
426 i = php_dns_search(handle, hostname, C_IN, type, answer.qb2, sizeof answer);
427 php_dns_free_handle(handle);
428
429 if (i < 0) {
430 RETURN_FALSE;
431 }
432 hp = (HEADER *)&answer;
433 RETURN_BOOL(ntohs(hp->ancount) != 0);
434 }
435 /* }}} */
436
437 #ifdef HAVE_FULL_DNS_FUNCS
438
439 #define CHECKCP(n) do { \
440 if (cp + n > end) { \
441 return NULL; \
442 } \
443 } while (0)
444
445 /* {{{ php_parserr */
php_parserr(uint8_t * cp,uint8_t * end,querybuf * answer,int type_to_fetch,int store,bool raw,zval * subarray)446 static uint8_t *php_parserr(uint8_t *cp, uint8_t *end, querybuf *answer, int type_to_fetch, int store, bool raw, zval *subarray)
447 {
448 u_short type, class, dlen;
449 u_long ttl;
450 long n, i;
451 u_short s;
452 uint8_t *tp, *p;
453 char name[MAXHOSTNAMELEN] = {0};
454 int have_v6_break = 0, in_v6_break = 0;
455
456 ZVAL_UNDEF(subarray);
457
458 n = dn_expand(answer->qb2, end, cp, name, sizeof(name) - 2);
459 if (n < 0) {
460 return NULL;
461 }
462 cp += n;
463
464 CHECKCP(10);
465 GETSHORT(type, cp);
466 GETSHORT(class, cp);
467 GETLONG(ttl, cp);
468 GETSHORT(dlen, cp);
469 CHECKCP(dlen);
470 if (dlen == 0) {
471 /* No data in the response - nothing to do */
472 return NULL;
473 }
474 if (type_to_fetch != DNS_T_ANY && type != type_to_fetch) {
475 cp += dlen;
476 return cp;
477 }
478
479 if (!store) {
480 cp += dlen;
481 return cp;
482 }
483
484 array_init(subarray);
485
486 add_assoc_string(subarray, "host", name);
487 add_assoc_string(subarray, "class", "IN");
488 add_assoc_long(subarray, "ttl", ttl);
489 (void) class;
490
491 if (raw) {
492 add_assoc_long(subarray, "type", type);
493 add_assoc_stringl(subarray, "data", (char*) cp, (uint32_t) dlen);
494 cp += dlen;
495 return cp;
496 }
497
498 switch (type) {
499 case DNS_T_A:
500 CHECKCP(4);
501 add_assoc_string(subarray, "type", "A");
502 snprintf(name, sizeof(name), "%d.%d.%d.%d", cp[0], cp[1], cp[2], cp[3]);
503 add_assoc_string(subarray, "ip", name);
504 cp += dlen;
505 break;
506 case DNS_T_MX:
507 CHECKCP(2);
508 add_assoc_string(subarray, "type", "MX");
509 GETSHORT(n, cp);
510 add_assoc_long(subarray, "pri", n);
511 ZEND_FALLTHROUGH;
512 case DNS_T_CNAME:
513 if (type == DNS_T_CNAME) {
514 add_assoc_string(subarray, "type", "CNAME");
515 }
516 ZEND_FALLTHROUGH;
517 case DNS_T_NS:
518 if (type == DNS_T_NS) {
519 add_assoc_string(subarray, "type", "NS");
520 }
521 ZEND_FALLTHROUGH;
522 case DNS_T_PTR:
523 if (type == DNS_T_PTR) {
524 add_assoc_string(subarray, "type", "PTR");
525 }
526 n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
527 if (n < 0) {
528 return NULL;
529 }
530 cp += n;
531 add_assoc_string(subarray, "target", name);
532 break;
533 case DNS_T_HINFO:
534 /* See RFC 1010 for values */
535 add_assoc_string(subarray, "type", "HINFO");
536 CHECKCP(1);
537 n = *cp & 0xFF;
538 cp++;
539 CHECKCP(n);
540 add_assoc_stringl(subarray, "cpu", (char*)cp, n);
541 cp += n;
542 CHECKCP(1);
543 n = *cp & 0xFF;
544 cp++;
545 CHECKCP(n);
546 add_assoc_stringl(subarray, "os", (char*)cp, n);
547 cp += n;
548 break;
549 case DNS_T_CAA:
550 /* See RFC 6844 for values https://tools.ietf.org/html/rfc6844 */
551 add_assoc_string(subarray, "type", "CAA");
552 // 1 flag byte
553 CHECKCP(1);
554 n = *cp & 0xFF;
555 add_assoc_long(subarray, "flags", n);
556 cp++;
557 // Tag length (1 byte)
558 CHECKCP(1);
559 n = *cp & 0xFF;
560 cp++;
561 CHECKCP(n);
562 add_assoc_stringl(subarray, "tag", (char*)cp, n);
563 cp += n;
564 if ( (size_t) dlen < ((size_t)n) + 2 ) {
565 return NULL;
566 }
567 n = dlen - n - 2;
568 CHECKCP(n);
569 add_assoc_stringl(subarray, "value", (char*)cp, n);
570 cp += n;
571 break;
572 case DNS_T_TXT:
573 {
574 int l1 = 0, l2 = 0;
575 zval entries;
576 zend_string *tp;
577
578 add_assoc_string(subarray, "type", "TXT");
579 tp = zend_string_alloc(dlen, 0);
580
581 array_init(&entries);
582
583 while (l1 < dlen) {
584 n = cp[l1];
585 if ((l1 + n) >= dlen) {
586 // Invalid chunk length, truncate
587 n = dlen - (l1 + 1);
588 }
589 if (n) {
590 memcpy(ZSTR_VAL(tp) + l2 , cp + l1 + 1, n);
591 add_next_index_stringl(&entries, (char *) cp + l1 + 1, n);
592 }
593 l1 = l1 + n + 1;
594 l2 = l2 + n;
595 }
596 ZSTR_VAL(tp)[l2] = '\0';
597 ZSTR_LEN(tp) = l2;
598 cp += dlen;
599
600 add_assoc_str(subarray, "txt", tp);
601 add_assoc_zval(subarray, "entries", &entries);
602 }
603 break;
604 case DNS_T_SOA:
605 add_assoc_string(subarray, "type", "SOA");
606 n = dn_expand(answer->qb2, end, cp, name, (sizeof name) -2);
607 if (n < 0) {
608 return NULL;
609 }
610 cp += n;
611 add_assoc_string(subarray, "mname", name);
612 n = dn_expand(answer->qb2, end, cp, name, (sizeof name) -2);
613 if (n < 0) {
614 return NULL;
615 }
616 cp += n;
617 add_assoc_string(subarray, "rname", name);
618 CHECKCP(5*4);
619 GETLONG(n, cp);
620 add_assoc_long(subarray, "serial", n);
621 GETLONG(n, cp);
622 add_assoc_long(subarray, "refresh", n);
623 GETLONG(n, cp);
624 add_assoc_long(subarray, "retry", n);
625 GETLONG(n, cp);
626 add_assoc_long(subarray, "expire", n);
627 GETLONG(n, cp);
628 add_assoc_long(subarray, "minimum-ttl", n);
629 break;
630 case DNS_T_AAAA:
631 tp = (uint8_t*)name;
632 CHECKCP(8*2);
633 for(i=0; i < 8; i++) {
634 GETSHORT(s, cp);
635 if (s != 0) {
636 if (tp > (uint8_t *)name) {
637 in_v6_break = 0;
638 tp[0] = ':';
639 tp++;
640 }
641 tp += sprintf((char*)tp,"%x",s);
642 } else {
643 if (!have_v6_break) {
644 have_v6_break = 1;
645 in_v6_break = 1;
646 tp[0] = ':';
647 tp++;
648 } else if (!in_v6_break) {
649 tp[0] = ':';
650 tp++;
651 tp[0] = '0';
652 tp++;
653 }
654 }
655 }
656 if (have_v6_break && in_v6_break) {
657 tp[0] = ':';
658 tp++;
659 }
660 tp[0] = '\0';
661 add_assoc_string(subarray, "type", "AAAA");
662 add_assoc_string(subarray, "ipv6", name);
663 break;
664 case DNS_T_A6:
665 p = cp;
666 add_assoc_string(subarray, "type", "A6");
667 CHECKCP(1);
668 n = ((int)cp[0]) & 0xFF;
669 cp++;
670 add_assoc_long(subarray, "masklen", n);
671 tp = (uint8_t*)name;
672 if (n > 15) {
673 have_v6_break = 1;
674 in_v6_break = 1;
675 tp[0] = ':';
676 tp++;
677 }
678 if (n % 16 > 8) {
679 /* Partial short */
680 if (cp[0] != 0) {
681 if (tp > (uint8_t *)name) {
682 in_v6_break = 0;
683 tp[0] = ':';
684 tp++;
685 }
686 sprintf((char*)tp, "%x", cp[0] & 0xFF);
687 } else {
688 if (!have_v6_break) {
689 have_v6_break = 1;
690 in_v6_break = 1;
691 tp[0] = ':';
692 tp++;
693 } else if (!in_v6_break) {
694 tp[0] = ':';
695 tp++;
696 tp[0] = '0';
697 tp++;
698 }
699 }
700 cp++;
701 }
702 for (i = (n + 8) / 16; i < 8; i++) {
703 CHECKCP(2);
704 GETSHORT(s, cp);
705 if (s != 0) {
706 if (tp > (uint8_t *)name) {
707 in_v6_break = 0;
708 tp[0] = ':';
709 tp++;
710 }
711 tp += sprintf((char*)tp,"%x",s);
712 } else {
713 if (!have_v6_break) {
714 have_v6_break = 1;
715 in_v6_break = 1;
716 tp[0] = ':';
717 tp++;
718 } else if (!in_v6_break) {
719 tp[0] = ':';
720 tp++;
721 tp[0] = '0';
722 tp++;
723 }
724 }
725 }
726 if (have_v6_break && in_v6_break) {
727 tp[0] = ':';
728 tp++;
729 }
730 tp[0] = '\0';
731 add_assoc_string(subarray, "ipv6", name);
732 if (cp < p + dlen) {
733 n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
734 if (n < 0) {
735 return NULL;
736 }
737 cp += n;
738 add_assoc_string(subarray, "chain", name);
739 }
740 break;
741 case DNS_T_SRV:
742 CHECKCP(3*2);
743 add_assoc_string(subarray, "type", "SRV");
744 GETSHORT(n, cp);
745 add_assoc_long(subarray, "pri", n);
746 GETSHORT(n, cp);
747 add_assoc_long(subarray, "weight", n);
748 GETSHORT(n, cp);
749 add_assoc_long(subarray, "port", n);
750 n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
751 if (n < 0) {
752 return NULL;
753 }
754 cp += n;
755 add_assoc_string(subarray, "target", name);
756 break;
757 case DNS_T_NAPTR:
758 CHECKCP(2*2);
759 add_assoc_string(subarray, "type", "NAPTR");
760 GETSHORT(n, cp);
761 add_assoc_long(subarray, "order", n);
762 GETSHORT(n, cp);
763 add_assoc_long(subarray, "pref", n);
764
765 CHECKCP(1);
766 n = (cp[0] & 0xFF);
767 cp++;
768 CHECKCP(n);
769 add_assoc_stringl(subarray, "flags", (char*)cp, n);
770 cp += n;
771
772 CHECKCP(1);
773 n = (cp[0] & 0xFF);
774 cp++;
775 CHECKCP(n);
776 add_assoc_stringl(subarray, "services", (char*)cp, n);
777 cp += n;
778
779 CHECKCP(1);
780 n = (cp[0] & 0xFF);
781 cp++;
782 CHECKCP(n);
783 add_assoc_stringl(subarray, "regex", (char*)cp, n);
784 cp += n;
785
786 n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
787 if (n < 0) {
788 return NULL;
789 }
790 cp += n;
791 add_assoc_string(subarray, "replacement", name);
792 break;
793 default:
794 zval_ptr_dtor(subarray);
795 ZVAL_UNDEF(subarray);
796 cp += dlen;
797 break;
798 }
799
800 return cp;
801 }
802 /* }}} */
803
804 /* {{{ Get any Resource Record corresponding to a given Internet host name */
PHP_FUNCTION(dns_get_record)805 PHP_FUNCTION(dns_get_record)
806 {
807 char *hostname;
808 size_t hostname_len;
809 zend_long type_param = PHP_DNS_ANY;
810 zval *authns = NULL, *addtl = NULL;
811 int type_to_fetch;
812 int dns_errno;
813 #if defined(HAVE_DNS_SEARCH)
814 struct sockaddr_storage from;
815 uint32_t fromsize = sizeof(from);
816 dns_handle_t handle;
817 #elif defined(HAVE_RES_NSEARCH)
818 struct __res_state state;
819 struct __res_state *handle = &state;
820 #endif
821 HEADER *hp;
822 querybuf answer = {0};
823 uint8_t *cp = NULL, *end = NULL;
824 int n, qd, an, ns = 0, ar = 0;
825 int type, first_query = 1, store_results = 1;
826 bool raw = 0;
827
828 ZEND_PARSE_PARAMETERS_START(1, 5)
829 Z_PARAM_STRING(hostname, hostname_len)
830 Z_PARAM_OPTIONAL
831 Z_PARAM_LONG(type_param)
832 Z_PARAM_ZVAL(authns)
833 Z_PARAM_ZVAL(addtl)
834 Z_PARAM_BOOL(raw)
835 ZEND_PARSE_PARAMETERS_END();
836
837 if (authns) {
838 authns = zend_try_array_init(authns);
839 if (!authns) {
840 RETURN_THROWS();
841 }
842 }
843 if (addtl) {
844 addtl = zend_try_array_init(addtl);
845 if (!addtl) {
846 RETURN_THROWS();
847 }
848 }
849
850 if (!raw) {
851 if ((type_param & ~PHP_DNS_ALL) && (type_param != PHP_DNS_ANY)) {
852 zend_argument_value_error(2, "must be a DNS_* constant");
853 RETURN_THROWS();
854 }
855 } else {
856 if ((type_param < 1) || (type_param > 0xFFFF)) {
857 zend_argument_value_error(2, "must be between 1 and 65535 when argument #5 ($raw) is true");
858 RETURN_THROWS();
859 }
860 }
861
862 /* Initialize the return array */
863 array_init(return_value);
864
865 /* - We emulate an or'ed type mask by querying type by type. (Steps 0 - NUMTYPES-1 )
866 * If additional info is wanted we check again with DNS_T_ANY (step NUMTYPES / NUMTYPES+1 )
867 * store_results is used to skip storing the results retrieved in step
868 * NUMTYPES+1 when results were already fetched.
869 * - In case of PHP_DNS_ANY we use the directly fetch DNS_T_ANY. (step NUMTYPES+1 )
870 * - In case of raw mode, we query only the requested type instead of looping type by type
871 * before going with the additional info stuff.
872 */
873
874 if (raw) {
875 type = -1;
876 } else if (type_param == PHP_DNS_ANY) {
877 type = PHP_DNS_NUM_TYPES + 1;
878 } else {
879 type = 0;
880 }
881
882 for ( ;
883 type < (addtl ? (PHP_DNS_NUM_TYPES + 2) : PHP_DNS_NUM_TYPES) || first_query;
884 type++
885 ) {
886 first_query = 0;
887 switch (type) {
888 case -1: /* raw */
889 type_to_fetch = type_param;
890 /* skip over the rest and go directly to additional records */
891 type = PHP_DNS_NUM_TYPES - 1;
892 break;
893 case 0:
894 type_to_fetch = type_param&PHP_DNS_A ? DNS_T_A : 0;
895 break;
896 case 1:
897 type_to_fetch = type_param&PHP_DNS_NS ? DNS_T_NS : 0;
898 break;
899 case 2:
900 type_to_fetch = type_param&PHP_DNS_CNAME ? DNS_T_CNAME : 0;
901 break;
902 case 3:
903 type_to_fetch = type_param&PHP_DNS_SOA ? DNS_T_SOA : 0;
904 break;
905 case 4:
906 type_to_fetch = type_param&PHP_DNS_PTR ? DNS_T_PTR : 0;
907 break;
908 case 5:
909 type_to_fetch = type_param&PHP_DNS_HINFO ? DNS_T_HINFO : 0;
910 break;
911 case 6:
912 type_to_fetch = type_param&PHP_DNS_MX ? DNS_T_MX : 0;
913 break;
914 case 7:
915 type_to_fetch = type_param&PHP_DNS_TXT ? DNS_T_TXT : 0;
916 break;
917 case 8:
918 type_to_fetch = type_param&PHP_DNS_AAAA ? DNS_T_AAAA : 0;
919 break;
920 case 9:
921 type_to_fetch = type_param&PHP_DNS_SRV ? DNS_T_SRV : 0;
922 break;
923 case 10:
924 type_to_fetch = type_param&PHP_DNS_NAPTR ? DNS_T_NAPTR : 0;
925 break;
926 case 11:
927 type_to_fetch = type_param&PHP_DNS_A6 ? DNS_T_A6 : 0;
928 break;
929 case 12:
930 type_to_fetch = type_param&PHP_DNS_CAA ? DNS_T_CAA : 0;
931 break;
932 case PHP_DNS_NUM_TYPES:
933 store_results = 0;
934 continue;
935 default:
936 case (PHP_DNS_NUM_TYPES + 1):
937 type_to_fetch = DNS_T_ANY;
938 break;
939 }
940
941 if (type_to_fetch) {
942 #if defined(HAVE_DNS_SEARCH)
943 handle = dns_open(NULL);
944 if (handle == NULL) {
945 zend_array_destroy(Z_ARR_P(return_value));
946 RETURN_FALSE;
947 }
948 #elif defined(HAVE_RES_NSEARCH)
949 memset(&state, 0, sizeof(state));
950 if (res_ninit(handle)) {
951 zend_array_destroy(Z_ARR_P(return_value));
952 RETURN_FALSE;
953 }
954 #else
955 res_init();
956 #endif
957
958 n = php_dns_search(handle, hostname, C_IN, type_to_fetch, answer.qb2, sizeof answer);
959
960 if (n < 0) {
961 dns_errno = php_dns_errno(handle);
962 php_dns_free_handle(handle);
963 switch (dns_errno) {
964 case NO_DATA:
965 case HOST_NOT_FOUND:
966 continue;
967
968 case NO_RECOVERY:
969 php_error_docref(NULL, E_WARNING, "An unexpected server failure occurred.");
970 break;
971
972 case TRY_AGAIN:
973 php_error_docref(NULL, E_WARNING, "A temporary server error occurred.");
974 break;
975
976 default:
977 php_error_docref(NULL, E_WARNING, "DNS Query failed");
978 }
979 zend_array_destroy(Z_ARR_P(return_value));
980 RETURN_FALSE;
981 }
982
983 cp = answer.qb2 + HFIXEDSZ;
984 end = answer.qb2 + n;
985 hp = (HEADER *)&answer;
986 qd = ntohs(hp->qdcount);
987 an = ntohs(hp->ancount);
988 ns = ntohs(hp->nscount);
989 ar = ntohs(hp->arcount);
990
991 /* Skip QD entries, they're only used by dn_expand later on */
992 while (qd-- > 0) {
993 n = dn_skipname(cp, end);
994 if (n < 0) {
995 php_error_docref(NULL, E_WARNING, "Unable to parse DNS data received");
996 zend_array_destroy(Z_ARR_P(return_value));
997 php_dns_free_handle(handle);
998 RETURN_FALSE;
999 }
1000 cp += n + QFIXEDSZ;
1001 }
1002
1003 /* YAY! Our real answers! */
1004 while (an-- && cp && cp < end) {
1005 zval retval;
1006
1007 cp = php_parserr(cp, end, &answer, type_to_fetch, store_results, raw, &retval);
1008 if (Z_TYPE(retval) != IS_UNDEF && store_results) {
1009 add_next_index_zval(return_value, &retval);
1010 }
1011 }
1012
1013 if (authns || addtl) {
1014 /* List of Authoritative Name Servers
1015 * Process when only requesting addtl so that we can skip through the section
1016 */
1017 while (ns-- > 0 && cp && cp < end) {
1018 zval retval;
1019
1020 cp = php_parserr(cp, end, &answer, DNS_T_ANY, authns != NULL, raw, &retval);
1021 if (Z_TYPE(retval) != IS_UNDEF) {
1022 add_next_index_zval(authns, &retval);
1023 }
1024 }
1025 }
1026
1027 if (addtl) {
1028 /* Additional records associated with authoritative name servers */
1029 while (ar-- > 0 && cp && cp < end) {
1030 zval retval;
1031
1032 cp = php_parserr(cp, end, &answer, DNS_T_ANY, 1, raw, &retval);
1033 if (Z_TYPE(retval) != IS_UNDEF) {
1034 add_next_index_zval(addtl, &retval);
1035 }
1036 }
1037 }
1038 php_dns_free_handle(handle);
1039 }
1040 }
1041 }
1042 /* }}} */
1043
1044 /* {{{ Get MX records corresponding to a given Internet host name */
PHP_FUNCTION(dns_get_mx)1045 PHP_FUNCTION(dns_get_mx)
1046 {
1047 char *hostname;
1048 size_t hostname_len;
1049 zval *mx_list, *weight_list = NULL;
1050 int count, qdc;
1051 u_short type, weight;
1052 querybuf answer = {0};
1053 char buf[MAXHOSTNAMELEN] = {0};
1054 HEADER *hp;
1055 uint8_t *cp, *end;
1056 int i;
1057 #if defined(HAVE_DNS_SEARCH)
1058 struct sockaddr_storage from;
1059 uint32_t fromsize = sizeof(from);
1060 dns_handle_t handle;
1061 #elif defined(HAVE_RES_NSEARCH)
1062 struct __res_state state;
1063 struct __res_state *handle = &state;
1064 #endif
1065
1066 ZEND_PARSE_PARAMETERS_START(2, 3)
1067 Z_PARAM_STRING(hostname, hostname_len)
1068 Z_PARAM_ZVAL(mx_list)
1069 Z_PARAM_OPTIONAL
1070 Z_PARAM_ZVAL(weight_list)
1071 ZEND_PARSE_PARAMETERS_END();
1072
1073 mx_list = zend_try_array_init(mx_list);
1074 if (!mx_list) {
1075 RETURN_THROWS();
1076 }
1077
1078 if (weight_list) {
1079 weight_list = zend_try_array_init(weight_list);
1080 if (!weight_list) {
1081 RETURN_THROWS();
1082 }
1083 }
1084
1085 #if defined(HAVE_DNS_SEARCH)
1086 handle = dns_open(NULL);
1087 if (handle == NULL) {
1088 RETURN_FALSE;
1089 }
1090 #elif defined(HAVE_RES_NSEARCH)
1091 memset(&state, 0, sizeof(state));
1092 if (res_ninit(handle)) {
1093 RETURN_FALSE;
1094 }
1095 #else
1096 res_init();
1097 #endif
1098
1099 i = php_dns_search(handle, hostname, C_IN, DNS_T_MX, answer.qb2, sizeof(answer));
1100 if (i < 0) {
1101 php_dns_free_handle(handle);
1102 RETURN_FALSE;
1103 }
1104 hp = (HEADER *)&answer;
1105 cp = answer.qb2 + HFIXEDSZ;
1106 end = answer.qb2 + i;
1107 for (qdc = ntohs((unsigned short)hp->qdcount); qdc--; cp += i + QFIXEDSZ) {
1108 if ((i = dn_skipname(cp, end)) < 0 ) {
1109 php_dns_free_handle(handle);
1110 RETURN_FALSE;
1111 }
1112 }
1113 count = ntohs((unsigned short)hp->ancount);
1114 while (--count >= 0 && cp < end) {
1115 if ((i = dn_skipname(cp, end)) < 0 ) {
1116 php_dns_free_handle(handle);
1117 RETURN_FALSE;
1118 }
1119 cp += i;
1120 GETSHORT(type, cp);
1121 cp += INT16SZ + INT32SZ;
1122 GETSHORT(i, cp);
1123 if (type != DNS_T_MX) {
1124 cp += i;
1125 continue;
1126 }
1127 GETSHORT(weight, cp);
1128 if ((i = dn_expand(answer.qb2, end, cp, buf, sizeof(buf)-1)) < 0) {
1129 php_dns_free_handle(handle);
1130 RETURN_FALSE;
1131 }
1132 cp += i;
1133 add_next_index_string(mx_list, buf);
1134 if (weight_list) {
1135 add_next_index_long(weight_list, weight);
1136 }
1137 }
1138 php_dns_free_handle(handle);
1139 RETURN_BOOL(zend_hash_num_elements(Z_ARRVAL_P(mx_list)) != 0);
1140 }
1141 /* }}} */
1142 #endif /* HAVE_FULL_DNS_FUNCS */
1143 #endif /* !defined(PHP_WIN32) && HAVE_DNS_SEARCH_FUNC */
1144
