1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Authors: The typical suspects |
16 | Pollita <pollita@php.net> |
17 | Marcus Boerger <helly@php.net> |
18 +----------------------------------------------------------------------+
19 */
20
21 /* {{{ includes */
22 #include "php.h"
23 #include "php_network.h"
24
25 #if HAVE_SYS_SOCKET_H
26 #include <sys/socket.h>
27 #endif
28
29 #ifdef PHP_WIN32
30 # include "win32/inet.h"
31 # include <winsock2.h>
32 # include <windows.h>
33 # include <Ws2tcpip.h>
34 #else
35 #include <netinet/in.h>
36 #if HAVE_ARPA_INET_H
37 #include <arpa/inet.h>
38 #endif
39 #include <netdb.h>
40 #ifdef _OSD_POSIX
41 #undef STATUS
42 #undef T_UNSPEC
43 #endif
44 #if HAVE_ARPA_NAMESER_H
45 #ifdef DARWIN
46 # define BIND_8_COMPAT 1
47 #endif
48 #include <arpa/nameser.h>
49 #endif
50 #if HAVE_RESOLV_H
51 #include <resolv.h>
52 #endif
53 #ifdef HAVE_DNS_H
54 #include <dns.h>
55 #endif
56 #endif
57
58 #ifndef MAXHOSTNAMELEN
59 #define MAXHOSTNAMELEN 255
60 #endif
61
62 /* For the local hostname obtained via gethostname which is different from the
63 dns-related MAXHOSTNAMELEN constant above */
64 #ifndef HOST_NAME_MAX
65 #define HOST_NAME_MAX 255
66 #endif
67
68 #include "php_dns.h"
69
70 /* type compat */
71 #ifndef DNS_T_A
72 #define DNS_T_A 1
73 #endif
74 #ifndef DNS_T_NS
75 #define DNS_T_NS 2
76 #endif
77 #ifndef DNS_T_CNAME
78 #define DNS_T_CNAME 5
79 #endif
80 #ifndef DNS_T_SOA
81 #define DNS_T_SOA 6
82 #endif
83 #ifndef DNS_T_PTR
84 #define DNS_T_PTR 12
85 #endif
86 #ifndef DNS_T_HINFO
87 #define DNS_T_HINFO 13
88 #endif
89 #ifndef DNS_T_MINFO
90 #define DNS_T_MINFO 14
91 #endif
92 #ifndef DNS_T_MX
93 #define DNS_T_MX 15
94 #endif
95 #ifndef DNS_T_TXT
96 #define DNS_T_TXT 16
97 #endif
98 #ifndef DNS_T_AAAA
99 #define DNS_T_AAAA 28
100 #endif
101 #ifndef DNS_T_SRV
102 #define DNS_T_SRV 33
103 #endif
104 #ifndef DNS_T_NAPTR
105 #define DNS_T_NAPTR 35
106 #endif
107 #ifndef DNS_T_A6
108 #define DNS_T_A6 38
109 #endif
110 #ifndef DNS_T_CAA
111 #define DNS_T_CAA 257
112 #endif
113
114 #ifndef DNS_T_ANY
115 #define DNS_T_ANY 255
116 #endif
117 /* }}} */
118
119 static zend_string *php_gethostbyaddr(char *ip);
120 static zend_string *php_gethostbyname(char *name);
121
122 #ifdef HAVE_GETHOSTNAME
123 /* {{{ proto string gethostname()
124 Get the host name of the current machine */
PHP_FUNCTION(gethostname)125 PHP_FUNCTION(gethostname)
126 {
127 char buf[HOST_NAME_MAX + 1];
128
129 if (zend_parse_parameters_none() == FAILURE) {
130 return;
131 }
132
133 if (gethostname(buf, sizeof(buf))) {
134 php_error_docref(NULL, E_WARNING, "unable to fetch host [%d]: %s", errno, strerror(errno));
135 RETURN_FALSE;
136 }
137
138 RETURN_STRING(buf);
139 }
140 /* }}} */
141 #endif
142
143 /* TODO: Reimplement the gethostby* functions using the new winxp+ API, in dns_win32.c, then
144 we can have a dns.c, dns_unix.c and dns_win32.c instead of a messy dns.c full of #ifdef
145 */
146
147 /* {{{ proto string gethostbyaddr(string ip_address)
148 Get the Internet host name corresponding to a given IP address */
PHP_FUNCTION(gethostbyaddr)149 PHP_FUNCTION(gethostbyaddr)
150 {
151 char *addr;
152 size_t addr_len;
153 zend_string *hostname;
154
155 ZEND_PARSE_PARAMETERS_START(1, 1)
156 Z_PARAM_STRING(addr, addr_len)
157 ZEND_PARSE_PARAMETERS_END();
158
159 hostname = php_gethostbyaddr(addr);
160
161 if (hostname == NULL) {
162 #if HAVE_IPV6 && HAVE_INET_PTON
163 php_error_docref(NULL, E_WARNING, "Address is not a valid IPv4 or IPv6 address");
164 #else
165 php_error_docref(NULL, E_WARNING, "Address is not in a.b.c.d form");
166 #endif
167 RETVAL_FALSE;
168 } else {
169 RETVAL_STR(hostname);
170 }
171 }
172 /* }}} */
173
174 /* {{{ php_gethostbyaddr */
php_gethostbyaddr(char * ip)175 static zend_string *php_gethostbyaddr(char *ip)
176 {
177 #if HAVE_IPV6 && HAVE_INET_PTON
178 struct in6_addr addr6;
179 #endif
180 struct in_addr addr;
181 struct hostent *hp;
182
183 #if HAVE_IPV6 && HAVE_INET_PTON
184 if (inet_pton(AF_INET6, ip, &addr6)) {
185 hp = gethostbyaddr((char *) &addr6, sizeof(addr6), AF_INET6);
186 } else if (inet_pton(AF_INET, ip, &addr)) {
187 hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
188 } else {
189 return NULL;
190 }
191 #else
192 addr.s_addr = inet_addr(ip);
193
194 if (addr.s_addr == -1) {
195 return NULL;
196 }
197
198 hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
199 #endif
200
201 if (!hp || hp->h_name == NULL || hp->h_name[0] == '\0') {
202 return zend_string_init(ip, strlen(ip), 0);
203 }
204
205 return zend_string_init(hp->h_name, strlen(hp->h_name), 0);
206 }
207 /* }}} */
208
209 /* {{{ proto string gethostbyname(string hostname)
210 Get the IP address corresponding to a given Internet host name */
PHP_FUNCTION(gethostbyname)211 PHP_FUNCTION(gethostbyname)
212 {
213 char *hostname;
214 size_t hostname_len;
215
216 ZEND_PARSE_PARAMETERS_START(1, 1)
217 Z_PARAM_STRING(hostname, hostname_len)
218 ZEND_PARSE_PARAMETERS_END();
219
220 if(hostname_len > MAXFQDNLEN) {
221 /* name too long, protect from CVE-2015-0235 */
222 php_error_docref(NULL, E_WARNING, "Host name is too long, the limit is %d characters", MAXFQDNLEN);
223 RETURN_STRINGL(hostname, hostname_len);
224 }
225
226 RETURN_STR(php_gethostbyname(hostname));
227 }
228 /* }}} */
229
230 /* {{{ proto array gethostbynamel(string hostname)
231 Return a list of IP addresses that a given hostname resolves to. */
PHP_FUNCTION(gethostbynamel)232 PHP_FUNCTION(gethostbynamel)
233 {
234 char *hostname;
235 size_t hostname_len;
236 struct hostent *hp;
237 struct in_addr in;
238 int i;
239
240 ZEND_PARSE_PARAMETERS_START(1, 1)
241 Z_PARAM_STRING(hostname, hostname_len)
242 ZEND_PARSE_PARAMETERS_END();
243
244 if(hostname_len > MAXFQDNLEN) {
245 /* name too long, protect from CVE-2015-0235 */
246 php_error_docref(NULL, E_WARNING, "Host name is too long, the limit is %d characters", MAXFQDNLEN);
247 RETURN_FALSE;
248 }
249
250 hp = php_network_gethostbyname(hostname);
251 if (!hp) {
252 RETURN_FALSE;
253 }
254
255 array_init(return_value);
256
257 for (i = 0;; i++) {
258 /* On macos h_addr_list entries may be misaligned. */
259 struct in_addr *h_addr_entry; /* Don't call this h_addr, it's a macro! */
260 memcpy(&h_addr_entry, &hp->h_addr_list[i], sizeof(struct in_addr *));
261 if (!h_addr_entry) {
262 return;
263 }
264
265 in = *h_addr_entry;
266 add_next_index_string(return_value, inet_ntoa(in));
267 }
268 }
269 /* }}} */
270
271 /* {{{ php_gethostbyname */
php_gethostbyname(char * name)272 static zend_string *php_gethostbyname(char *name)
273 {
274 struct hostent *hp;
275 struct in_addr *h_addr_0; /* Don't call this h_addr, it's a macro! */
276 struct in_addr in;
277 char *address;
278
279 hp = php_network_gethostbyname(name);
280 if (!hp) {
281 return zend_string_init(name, strlen(name), 0);
282 }
283
284 /* On macos h_addr_list entries may be misaligned. */
285 memcpy(&h_addr_0, &hp->h_addr_list[0], sizeof(struct in_addr *));
286 if (!h_addr_0) {
287 return zend_string_init(name, strlen(name), 0);
288 }
289
290 memcpy(&in.s_addr, h_addr_0, sizeof(in.s_addr));
291
292 address = inet_ntoa(in);
293 return zend_string_init(address, strlen(address), 0);
294 }
295 /* }}} */
296
297 #if HAVE_FULL_DNS_FUNCS || defined(PHP_WIN32)
298 # define PHP_DNS_NUM_TYPES 13 /* Number of DNS Types Supported by PHP currently */
299
300 # define PHP_DNS_A 0x00000001
301 # define PHP_DNS_NS 0x00000002
302 # define PHP_DNS_CNAME 0x00000010
303 # define PHP_DNS_SOA 0x00000020
304 # define PHP_DNS_PTR 0x00000800
305 # define PHP_DNS_HINFO 0x00001000
306 # define PHP_DNS_CAA 0x00002000
307 # define PHP_DNS_MX 0x00004000
308 # define PHP_DNS_TXT 0x00008000
309 # define PHP_DNS_A6 0x01000000
310 # define PHP_DNS_SRV 0x02000000
311 # define PHP_DNS_NAPTR 0x04000000
312 # define PHP_DNS_AAAA 0x08000000
313 # define PHP_DNS_ANY 0x10000000
314 # define PHP_DNS_ALL (PHP_DNS_A|PHP_DNS_NS|PHP_DNS_CNAME|PHP_DNS_SOA|PHP_DNS_PTR|PHP_DNS_HINFO|PHP_DNS_CAA|PHP_DNS_MX|PHP_DNS_TXT|PHP_DNS_A6|PHP_DNS_SRV|PHP_DNS_NAPTR|PHP_DNS_AAAA)
315 #endif /* HAVE_FULL_DNS_FUNCS || defined(PHP_WIN32) */
316
317 /* Note: These functions are defined in ext/standard/dns_win32.c for Windows! */
318 #if !defined(PHP_WIN32) && HAVE_DNS_SEARCH_FUNC
319
320 #ifndef HFIXEDSZ
321 #define HFIXEDSZ 12 /* fixed data in header <arpa/nameser.h> */
322 #endif /* HFIXEDSZ */
323
324 #ifndef QFIXEDSZ
325 #define QFIXEDSZ 4 /* fixed data in query <arpa/nameser.h> */
326 #endif /* QFIXEDSZ */
327
328 #undef MAXHOSTNAMELEN
329 #define MAXHOSTNAMELEN 1024
330
331 #ifndef MAXRESOURCERECORDS
332 #define MAXRESOURCERECORDS 64
333 #endif /* MAXRESOURCERECORDS */
334
335 typedef union {
336 HEADER qb1;
337 u_char qb2[65536];
338 } querybuf;
339
340 /* just a hack to free resources allocated by glibc in __res_nsend()
341 * See also:
342 * res_thread_freeres() in glibc/resolv/res_init.c
343 * __libc_res_nsend() in resolv/res_send.c
344 * */
345
346 #if defined(__GLIBC__) && !defined(HAVE_DEPRECATED_DNS_FUNCS)
347 #define php_dns_free_res(__res__) _php_dns_free_res(__res__)
_php_dns_free_res(struct __res_state * res)348 static void _php_dns_free_res(struct __res_state *res) { /* {{{ */
349 int ns;
350 for (ns = 0; ns < MAXNS; ns++) {
351 if (res->_u._ext.nsaddrs[ns] != NULL) {
352 free (res->_u._ext.nsaddrs[ns]);
353 res->_u._ext.nsaddrs[ns] = NULL;
354 }
355 }
356 } /* }}} */
357 #else
358 #define php_dns_free_res(__res__)
359 #endif
360
361 /* {{{ proto bool dns_check_record(string host [, string type])
362 Check DNS records corresponding to a given Internet host name or IP address */
PHP_FUNCTION(dns_check_record)363 PHP_FUNCTION(dns_check_record)
364 {
365 HEADER *hp;
366 querybuf answer;
367 char *hostname, *rectype = NULL;
368 size_t hostname_len, rectype_len = 0;
369 int type = DNS_T_MX, i;
370 #if defined(HAVE_DNS_SEARCH)
371 struct sockaddr_storage from;
372 uint32_t fromsize = sizeof(from);
373 dns_handle_t handle;
374 #elif defined(HAVE_RES_NSEARCH)
375 struct __res_state state;
376 struct __res_state *handle = &state;
377 #endif
378
379 ZEND_PARSE_PARAMETERS_START(1, 2)
380 Z_PARAM_STRING(hostname, hostname_len)
381 Z_PARAM_OPTIONAL
382 Z_PARAM_STRING(rectype, rectype_len)
383 ZEND_PARSE_PARAMETERS_END();
384
385 if (hostname_len == 0) {
386 php_error_docref(NULL, E_WARNING, "Host cannot be empty");
387 RETURN_FALSE;
388 }
389
390 if (rectype) {
391 if (!strcasecmp("A", rectype)) type = DNS_T_A;
392 else if (!strcasecmp("NS", rectype)) type = DNS_T_NS;
393 else if (!strcasecmp("MX", rectype)) type = DNS_T_MX;
394 else if (!strcasecmp("PTR", rectype)) type = DNS_T_PTR;
395 else if (!strcasecmp("ANY", rectype)) type = DNS_T_ANY;
396 else if (!strcasecmp("SOA", rectype)) type = DNS_T_SOA;
397 else if (!strcasecmp("CAA", rectype)) type = DNS_T_CAA;
398 else if (!strcasecmp("TXT", rectype)) type = DNS_T_TXT;
399 else if (!strcasecmp("CNAME", rectype)) type = DNS_T_CNAME;
400 else if (!strcasecmp("AAAA", rectype)) type = DNS_T_AAAA;
401 else if (!strcasecmp("SRV", rectype)) type = DNS_T_SRV;
402 else if (!strcasecmp("NAPTR", rectype)) type = DNS_T_NAPTR;
403 else if (!strcasecmp("A6", rectype)) type = DNS_T_A6;
404 else {
405 php_error_docref(NULL, E_WARNING, "Type '%s' not supported", rectype);
406 RETURN_FALSE;
407 }
408 }
409
410 #if defined(HAVE_DNS_SEARCH)
411 handle = dns_open(NULL);
412 if (handle == NULL) {
413 RETURN_FALSE;
414 }
415 #elif defined(HAVE_RES_NSEARCH)
416 memset(&state, 0, sizeof(state));
417 if (res_ninit(handle)) {
418 RETURN_FALSE;
419 }
420 #else
421 res_init();
422 #endif
423
424 i = php_dns_search(handle, hostname, C_IN, type, answer.qb2, sizeof answer);
425 php_dns_free_handle(handle);
426
427 if (i < 0) {
428 RETURN_FALSE;
429 }
430 hp = (HEADER *)&answer;
431 RETURN_BOOL(ntohs(hp->ancount) != 0);
432 }
433 /* }}} */
434
435 #if HAVE_FULL_DNS_FUNCS
436
437 #define CHECKCP(n) do { \
438 if (cp + n > end) { \
439 return NULL; \
440 } \
441 } while (0)
442
443 /* {{{ php_parserr */
php_parserr(u_char * cp,u_char * end,querybuf * answer,int type_to_fetch,int store,int raw,zval * subarray)444 static u_char *php_parserr(u_char *cp, u_char *end, querybuf *answer, int type_to_fetch, int store, int raw, zval *subarray)
445 {
446 u_short type, class, dlen;
447 u_long ttl;
448 long n, i;
449 u_short s;
450 u_char *tp, *p;
451 char name[MAXHOSTNAMELEN];
452 int have_v6_break = 0, in_v6_break = 0;
453
454 ZVAL_UNDEF(subarray);
455
456 n = dn_expand(answer->qb2, end, cp, name, sizeof(name) - 2);
457 if (n < 0) {
458 return NULL;
459 }
460 cp += n;
461
462 CHECKCP(10);
463 GETSHORT(type, cp);
464 GETSHORT(class, cp);
465 GETLONG(ttl, cp);
466 GETSHORT(dlen, cp);
467 CHECKCP(dlen);
468 if (dlen == 0) {
469 /* No data in the response - nothing to do */
470 return NULL;
471 }
472 if (type_to_fetch != DNS_T_ANY && type != type_to_fetch) {
473 cp += dlen;
474 return cp;
475 }
476
477 if (!store) {
478 cp += dlen;
479 return cp;
480 }
481
482 array_init(subarray);
483
484 add_assoc_string(subarray, "host", name);
485 add_assoc_string(subarray, "class", "IN");
486 add_assoc_long(subarray, "ttl", ttl);
487 (void) class;
488
489 if (raw) {
490 add_assoc_long(subarray, "type", type);
491 add_assoc_stringl(subarray, "data", (char*) cp, (uint32_t) dlen);
492 cp += dlen;
493 return cp;
494 }
495
496 switch (type) {
497 case DNS_T_A:
498 CHECKCP(4);
499 add_assoc_string(subarray, "type", "A");
500 snprintf(name, sizeof(name), "%d.%d.%d.%d", cp[0], cp[1], cp[2], cp[3]);
501 add_assoc_string(subarray, "ip", name);
502 cp += dlen;
503 break;
504 case DNS_T_MX:
505 CHECKCP(2);
506 add_assoc_string(subarray, "type", "MX");
507 GETSHORT(n, cp);
508 add_assoc_long(subarray, "pri", n);
509 /* no break; */
510 case DNS_T_CNAME:
511 if (type == DNS_T_CNAME) {
512 add_assoc_string(subarray, "type", "CNAME");
513 }
514 /* no break; */
515 case DNS_T_NS:
516 if (type == DNS_T_NS) {
517 add_assoc_string(subarray, "type", "NS");
518 }
519 /* no break; */
520 case DNS_T_PTR:
521 if (type == DNS_T_PTR) {
522 add_assoc_string(subarray, "type", "PTR");
523 }
524 n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
525 if (n < 0) {
526 return NULL;
527 }
528 cp += n;
529 add_assoc_string(subarray, "target", name);
530 break;
531 case DNS_T_HINFO:
532 /* See RFC 1010 for values */
533 add_assoc_string(subarray, "type", "HINFO");
534 CHECKCP(1);
535 n = *cp & 0xFF;
536 cp++;
537 CHECKCP(n);
538 add_assoc_stringl(subarray, "cpu", (char*)cp, n);
539 cp += n;
540 CHECKCP(1);
541 n = *cp & 0xFF;
542 cp++;
543 CHECKCP(n);
544 add_assoc_stringl(subarray, "os", (char*)cp, n);
545 cp += n;
546 break;
547 case DNS_T_CAA:
548 /* See RFC 6844 for values https://tools.ietf.org/html/rfc6844 */
549 add_assoc_string(subarray, "type", "CAA");
550 // 1 flag byte
551 CHECKCP(1);
552 n = *cp & 0xFF;
553 add_assoc_long(subarray, "flags", n);
554 cp++;
555 // Tag length (1 byte)
556 CHECKCP(1);
557 n = *cp & 0xFF;
558 cp++;
559 CHECKCP(n);
560 add_assoc_stringl(subarray, "tag", (char*)cp, n);
561 cp += n;
562 if ( (size_t) dlen < ((size_t)n) + 2 ) {
563 return NULL;
564 }
565 n = dlen - n - 2;
566 CHECKCP(n);
567 add_assoc_stringl(subarray, "value", (char*)cp, n);
568 cp += n;
569 break;
570 case DNS_T_TXT:
571 {
572 int l1 = 0, l2 = 0;
573 zval entries;
574 zend_string *tp;
575
576 add_assoc_string(subarray, "type", "TXT");
577 tp = zend_string_alloc(dlen, 0);
578
579 array_init(&entries);
580
581 while (l1 < dlen) {
582 n = cp[l1];
583 if ((l1 + n) >= dlen) {
584 // Invalid chunk length, truncate
585 n = dlen - (l1 + 1);
586 }
587 if (n) {
588 memcpy(ZSTR_VAL(tp) + l2 , cp + l1 + 1, n);
589 add_next_index_stringl(&entries, (char *) cp + l1 + 1, n);
590 }
591 l1 = l1 + n + 1;
592 l2 = l2 + n;
593 }
594 ZSTR_VAL(tp)[l2] = '\0';
595 ZSTR_LEN(tp) = l2;
596 cp += dlen;
597
598 add_assoc_str(subarray, "txt", tp);
599 add_assoc_zval(subarray, "entries", &entries);
600 }
601 break;
602 case DNS_T_SOA:
603 add_assoc_string(subarray, "type", "SOA");
604 n = dn_expand(answer->qb2, end, cp, name, (sizeof name) -2);
605 if (n < 0) {
606 return NULL;
607 }
608 cp += n;
609 add_assoc_string(subarray, "mname", name);
610 n = dn_expand(answer->qb2, end, cp, name, (sizeof name) -2);
611 if (n < 0) {
612 return NULL;
613 }
614 cp += n;
615 add_assoc_string(subarray, "rname", name);
616 CHECKCP(5*4);
617 GETLONG(n, cp);
618 add_assoc_long(subarray, "serial", n);
619 GETLONG(n, cp);
620 add_assoc_long(subarray, "refresh", n);
621 GETLONG(n, cp);
622 add_assoc_long(subarray, "retry", n);
623 GETLONG(n, cp);
624 add_assoc_long(subarray, "expire", n);
625 GETLONG(n, cp);
626 add_assoc_long(subarray, "minimum-ttl", n);
627 break;
628 case DNS_T_AAAA:
629 tp = (u_char*)name;
630 CHECKCP(8*2);
631 for(i=0; i < 8; i++) {
632 GETSHORT(s, cp);
633 if (s != 0) {
634 if (tp > (u_char *)name) {
635 in_v6_break = 0;
636 tp[0] = ':';
637 tp++;
638 }
639 tp += sprintf((char*)tp,"%x",s);
640 } else {
641 if (!have_v6_break) {
642 have_v6_break = 1;
643 in_v6_break = 1;
644 tp[0] = ':';
645 tp++;
646 } else if (!in_v6_break) {
647 tp[0] = ':';
648 tp++;
649 tp[0] = '0';
650 tp++;
651 }
652 }
653 }
654 if (have_v6_break && in_v6_break) {
655 tp[0] = ':';
656 tp++;
657 }
658 tp[0] = '\0';
659 add_assoc_string(subarray, "type", "AAAA");
660 add_assoc_string(subarray, "ipv6", name);
661 break;
662 case DNS_T_A6:
663 p = cp;
664 add_assoc_string(subarray, "type", "A6");
665 CHECKCP(1);
666 n = ((int)cp[0]) & 0xFF;
667 cp++;
668 add_assoc_long(subarray, "masklen", n);
669 tp = (u_char*)name;
670 if (n > 15) {
671 have_v6_break = 1;
672 in_v6_break = 1;
673 tp[0] = ':';
674 tp++;
675 }
676 if (n % 16 > 8) {
677 /* Partial short */
678 if (cp[0] != 0) {
679 if (tp > (u_char *)name) {
680 in_v6_break = 0;
681 tp[0] = ':';
682 tp++;
683 }
684 sprintf((char*)tp, "%x", cp[0] & 0xFF);
685 } else {
686 if (!have_v6_break) {
687 have_v6_break = 1;
688 in_v6_break = 1;
689 tp[0] = ':';
690 tp++;
691 } else if (!in_v6_break) {
692 tp[0] = ':';
693 tp++;
694 tp[0] = '0';
695 tp++;
696 }
697 }
698 cp++;
699 }
700 for (i = (n + 8) / 16; i < 8; i++) {
701 CHECKCP(2);
702 GETSHORT(s, cp);
703 if (s != 0) {
704 if (tp > (u_char *)name) {
705 in_v6_break = 0;
706 tp[0] = ':';
707 tp++;
708 }
709 tp += sprintf((char*)tp,"%x",s);
710 } else {
711 if (!have_v6_break) {
712 have_v6_break = 1;
713 in_v6_break = 1;
714 tp[0] = ':';
715 tp++;
716 } else if (!in_v6_break) {
717 tp[0] = ':';
718 tp++;
719 tp[0] = '0';
720 tp++;
721 }
722 }
723 }
724 if (have_v6_break && in_v6_break) {
725 tp[0] = ':';
726 tp++;
727 }
728 tp[0] = '\0';
729 add_assoc_string(subarray, "ipv6", name);
730 if (cp < p + dlen) {
731 n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
732 if (n < 0) {
733 return NULL;
734 }
735 cp += n;
736 add_assoc_string(subarray, "chain", name);
737 }
738 break;
739 case DNS_T_SRV:
740 CHECKCP(3*2);
741 add_assoc_string(subarray, "type", "SRV");
742 GETSHORT(n, cp);
743 add_assoc_long(subarray, "pri", n);
744 GETSHORT(n, cp);
745 add_assoc_long(subarray, "weight", n);
746 GETSHORT(n, cp);
747 add_assoc_long(subarray, "port", n);
748 n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
749 if (n < 0) {
750 return NULL;
751 }
752 cp += n;
753 add_assoc_string(subarray, "target", name);
754 break;
755 case DNS_T_NAPTR:
756 CHECKCP(2*2);
757 add_assoc_string(subarray, "type", "NAPTR");
758 GETSHORT(n, cp);
759 add_assoc_long(subarray, "order", n);
760 GETSHORT(n, cp);
761 add_assoc_long(subarray, "pref", n);
762
763 CHECKCP(1);
764 n = (cp[0] & 0xFF);
765 cp++;
766 CHECKCP(n);
767 add_assoc_stringl(subarray, "flags", (char*)cp, n);
768 cp += n;
769
770 CHECKCP(1);
771 n = (cp[0] & 0xFF);
772 cp++;
773 CHECKCP(n);
774 add_assoc_stringl(subarray, "services", (char*)cp, n);
775 cp += n;
776
777 CHECKCP(1);
778 n = (cp[0] & 0xFF);
779 cp++;
780 CHECKCP(n);
781 add_assoc_stringl(subarray, "regex", (char*)cp, n);
782 cp += n;
783
784 n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
785 if (n < 0) {
786 return NULL;
787 }
788 cp += n;
789 add_assoc_string(subarray, "replacement", name);
790 break;
791 default:
792 zval_ptr_dtor(subarray);
793 ZVAL_UNDEF(subarray);
794 cp += dlen;
795 break;
796 }
797
798 return cp;
799 }
800 /* }}} */
801
802 /* {{{ proto array|false dns_get_record(string hostname [, int type[, array &authns[, array &addtl[, bool raw]]]])
803 Get any Resource Record corresponding to a given Internet host name */
PHP_FUNCTION(dns_get_record)804 PHP_FUNCTION(dns_get_record)
805 {
806 char *hostname;
807 size_t hostname_len;
808 zend_long type_param = PHP_DNS_ANY;
809 zval *authns = NULL, *addtl = NULL;
810 int type_to_fetch;
811 int dns_errno;
812 #if defined(HAVE_DNS_SEARCH)
813 struct sockaddr_storage from;
814 uint32_t fromsize = sizeof(from);
815 dns_handle_t handle;
816 #elif defined(HAVE_RES_NSEARCH)
817 struct __res_state state;
818 struct __res_state *handle = &state;
819 #endif
820 HEADER *hp;
821 querybuf answer;
822 u_char *cp = NULL, *end = NULL;
823 int n, qd, an, ns = 0, ar = 0;
824 int type, first_query = 1, store_results = 1;
825 zend_bool raw = 0;
826
827 ZEND_PARSE_PARAMETERS_START(1, 5)
828 Z_PARAM_STRING(hostname, hostname_len)
829 Z_PARAM_OPTIONAL
830 Z_PARAM_LONG(type_param)
831 Z_PARAM_ZVAL(authns)
832 Z_PARAM_ZVAL(addtl)
833 Z_PARAM_BOOL(raw)
834 ZEND_PARSE_PARAMETERS_END();
835
836 if (authns) {
837 authns = zend_try_array_init(authns);
838 if (!authns) {
839 return;
840 }
841 }
842 if (addtl) {
843 addtl = zend_try_array_init(addtl);
844 if (!addtl) {
845 return;
846 }
847 }
848
849 if (!raw) {
850 if ((type_param & ~PHP_DNS_ALL) && (type_param != PHP_DNS_ANY)) {
851 php_error_docref(NULL, E_WARNING, "Type '" ZEND_LONG_FMT "' not supported", type_param);
852 RETURN_FALSE;
853 }
854 } else {
855 if ((type_param < 1) || (type_param > 0xFFFF)) {
856 php_error_docref(NULL, E_WARNING,
857 "Numeric DNS record type must be between 1 and 65535, '" ZEND_LONG_FMT "' given", type_param);
858 RETURN_FALSE;
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 requestd 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 /* {{{ proto bool dns_get_mx(string hostname, array mxhosts [, array weight])
1045 Get MX records corresponding to a given Internet host name */
PHP_FUNCTION(dns_get_mx)1046 PHP_FUNCTION(dns_get_mx)
1047 {
1048 char *hostname;
1049 size_t hostname_len;
1050 zval *mx_list, *weight_list = NULL;
1051 int count, qdc;
1052 u_short type, weight;
1053 querybuf answer;
1054 char buf[MAXHOSTNAMELEN];
1055 HEADER *hp;
1056 u_char *cp, *end;
1057 int i;
1058 #if defined(HAVE_DNS_SEARCH)
1059 struct sockaddr_storage from;
1060 uint32_t fromsize = sizeof(from);
1061 dns_handle_t handle;
1062 #elif defined(HAVE_RES_NSEARCH)
1063 struct __res_state state;
1064 struct __res_state *handle = &state;
1065 #endif
1066
1067 ZEND_PARSE_PARAMETERS_START(2, 3)
1068 Z_PARAM_STRING(hostname, hostname_len)
1069 Z_PARAM_ZVAL(mx_list)
1070 Z_PARAM_OPTIONAL
1071 Z_PARAM_ZVAL(weight_list)
1072 ZEND_PARSE_PARAMETERS_END();
1073
1074 mx_list = zend_try_array_init(mx_list);
1075 if (!mx_list) {
1076 return;
1077 }
1078
1079 if (weight_list) {
1080 weight_list = zend_try_array_init(weight_list);
1081 if (!weight_list) {
1082 return;
1083 }
1084 }
1085
1086 #if defined(HAVE_DNS_SEARCH)
1087 handle = dns_open(NULL);
1088 if (handle == NULL) {
1089 RETURN_FALSE;
1090 }
1091 #elif defined(HAVE_RES_NSEARCH)
1092 memset(&state, 0, sizeof(state));
1093 if (res_ninit(handle)) {
1094 RETURN_FALSE;
1095 }
1096 #else
1097 res_init();
1098 #endif
1099
1100 i = php_dns_search(handle, hostname, C_IN, DNS_T_MX, answer.qb2, sizeof answer);
1101 if (i < 0) {
1102 php_dns_free_handle(handle);
1103 RETURN_FALSE;
1104 }
1105 hp = (HEADER *)&answer;
1106 cp = answer.qb2 + HFIXEDSZ;
1107 end = answer.qb2 + i;
1108 for (qdc = ntohs((unsigned short)hp->qdcount); qdc--; cp += i + QFIXEDSZ) {
1109 if ((i = dn_skipname(cp, end)) < 0 ) {
1110 php_dns_free_handle(handle);
1111 RETURN_FALSE;
1112 }
1113 }
1114 count = ntohs((unsigned short)hp->ancount);
1115 while (--count >= 0 && cp < end) {
1116 if ((i = dn_skipname(cp, end)) < 0 ) {
1117 php_dns_free_handle(handle);
1118 RETURN_FALSE;
1119 }
1120 cp += i;
1121 GETSHORT(type, cp);
1122 cp += INT16SZ + INT32SZ;
1123 GETSHORT(i, cp);
1124 if (type != DNS_T_MX) {
1125 cp += i;
1126 continue;
1127 }
1128 GETSHORT(weight, cp);
1129 if ((i = dn_expand(answer.qb2, end, cp, buf, sizeof(buf)-1)) < 0) {
1130 php_dns_free_handle(handle);
1131 RETURN_FALSE;
1132 }
1133 cp += i;
1134 add_next_index_string(mx_list, buf);
1135 if (weight_list) {
1136 add_next_index_long(weight_list, weight);
1137 }
1138 }
1139 php_dns_free_handle(handle);
1140 RETURN_BOOL(zend_hash_num_elements(Z_ARRVAL_P(mx_list)) != 0);
1141 }
1142 /* }}} */
1143 #endif /* HAVE_FULL_DNS_FUNCS */
1144 #endif /* !defined(PHP_WIN32) && HAVE_DNS_SEARCH_FUNC */
1145
1146 #if HAVE_FULL_DNS_FUNCS && !defined(PHP_WIN32)
PHP_MINIT_FUNCTION(dns)1147 PHP_MINIT_FUNCTION(dns) {
1148 REGISTER_LONG_CONSTANT("DNS_A", PHP_DNS_A, CONST_CS | CONST_PERSISTENT);
1149 REGISTER_LONG_CONSTANT("DNS_NS", PHP_DNS_NS, CONST_CS | CONST_PERSISTENT);
1150 REGISTER_LONG_CONSTANT("DNS_CNAME", PHP_DNS_CNAME, CONST_CS | CONST_PERSISTENT);
1151 REGISTER_LONG_CONSTANT("DNS_SOA", PHP_DNS_SOA, CONST_CS | CONST_PERSISTENT);
1152 REGISTER_LONG_CONSTANT("DNS_PTR", PHP_DNS_PTR, CONST_CS | CONST_PERSISTENT);
1153 REGISTER_LONG_CONSTANT("DNS_HINFO", PHP_DNS_HINFO, CONST_CS | CONST_PERSISTENT);
1154 REGISTER_LONG_CONSTANT("DNS_CAA", PHP_DNS_CAA, CONST_CS | CONST_PERSISTENT);
1155 REGISTER_LONG_CONSTANT("DNS_MX", PHP_DNS_MX, CONST_CS | CONST_PERSISTENT);
1156 REGISTER_LONG_CONSTANT("DNS_TXT", PHP_DNS_TXT, CONST_CS | CONST_PERSISTENT);
1157 REGISTER_LONG_CONSTANT("DNS_SRV", PHP_DNS_SRV, CONST_CS | CONST_PERSISTENT);
1158 REGISTER_LONG_CONSTANT("DNS_NAPTR", PHP_DNS_NAPTR, CONST_CS | CONST_PERSISTENT);
1159 REGISTER_LONG_CONSTANT("DNS_AAAA", PHP_DNS_AAAA, CONST_CS | CONST_PERSISTENT);
1160 REGISTER_LONG_CONSTANT("DNS_A6", PHP_DNS_A6, CONST_CS | CONST_PERSISTENT);
1161 REGISTER_LONG_CONSTANT("DNS_ANY", PHP_DNS_ANY, CONST_CS | CONST_PERSISTENT);
1162 REGISTER_LONG_CONSTANT("DNS_ALL", PHP_DNS_ALL, CONST_CS | CONST_PERSISTENT);
1163 return SUCCESS;
1164 }
1165 #endif /* HAVE_FULL_DNS_FUNCS */
1166
