1/*
2   +----------------------------------------------------------------------+
3   | PHP Version 7                                                        |
4   +----------------------------------------------------------------------+
5   | Copyright (c) 1997-2015 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/* $Id$ */
22
23/* {{{ includes */
24#include "php.h"
25#include "php_network.h"
26
27#if HAVE_SYS_SOCKET_H
28#include <sys/socket.h>
29#endif
30
31#ifdef PHP_WIN32
32# include "win32/inet.h"
33# include <winsock2.h>
34# include <windows.h>
35# include <Ws2tcpip.h>
36#else   /* This holds good for NetWare too, both for Winsock and Berkeley sockets */
37#include <netinet/in.h>
38#if HAVE_ARPA_INET_H
39#include <arpa/inet.h>
40#endif
41#include <netdb.h>
42#ifdef _OSD_POSIX
43#undef STATUS
44#undef T_UNSPEC
45#endif
46#if HAVE_ARPA_NAMESER_H
47#ifdef DARWIN
48# define BIND_8_COMPAT 1
49#endif
50#include <arpa/nameser.h>
51#endif
52#if HAVE_RESOLV_H
53#include <resolv.h>
54#endif
55#ifdef HAVE_DNS_H
56#include <dns.h>
57#endif
58#endif
59
60/* Borrowed from SYS/SOCKET.H */
61#if defined(NETWARE) && defined(USE_WINSOCK)
62#define AF_INET 2   /* internetwork: UDP, TCP, etc. */
63#endif
64
65#ifndef MAXHOSTNAMELEN
66#define MAXHOSTNAMELEN 255
67#endif
68
69/* For the local hostname obtained via gethostname which is different from the
70   dns-related MAXHOSTNAMELEN constant above */
71#ifndef HOST_NAME_MAX
72#define HOST_NAME_MAX 255
73#endif
74
75#include "php_dns.h"
76
77/* type compat */
78#ifndef DNS_T_A
79#define DNS_T_A     1
80#endif
81#ifndef DNS_T_NS
82#define DNS_T_NS    2
83#endif
84#ifndef DNS_T_CNAME
85#define DNS_T_CNAME 5
86#endif
87#ifndef DNS_T_SOA
88#define DNS_T_SOA   6
89#endif
90#ifndef DNS_T_PTR
91#define DNS_T_PTR   12
92#endif
93#ifndef DNS_T_HINFO
94#define DNS_T_HINFO 13
95#endif
96#ifndef DNS_T_MINFO
97#define DNS_T_MINFO 14
98#endif
99#ifndef DNS_T_MX
100#define DNS_T_MX    15
101#endif
102#ifndef DNS_T_TXT
103#define DNS_T_TXT   16
104#endif
105#ifndef DNS_T_AAAA
106#define DNS_T_AAAA  28
107#endif
108#ifndef DNS_T_SRV
109#define DNS_T_SRV   33
110#endif
111#ifndef DNS_T_NAPTR
112#define DNS_T_NAPTR 35
113#endif
114#ifndef DNS_T_A6
115#define DNS_T_A6    38
116#endif
117
118#ifndef DNS_T_ANY
119#define DNS_T_ANY   255
120#endif
121/* }}} */
122
123static zend_string *php_gethostbyaddr(char *ip);
124static zend_string *php_gethostbyname(char *name);
125
126#ifdef HAVE_GETHOSTNAME
127/* {{{ proto string gethostname()
128   Get the host name of the current machine */
129PHP_FUNCTION(gethostname)
130{
131    char buf[HOST_NAME_MAX];
132
133    if (zend_parse_parameters_none() == FAILURE) {
134        return;
135    }
136
137    if (gethostname(buf, sizeof(buf) - 1)) {
138        php_error_docref(NULL, E_WARNING, "unable to fetch host [%d]: %s", errno, strerror(errno));
139        RETURN_FALSE;
140    }
141
142    RETURN_STRING(buf);
143}
144/* }}} */
145#endif
146
147/* TODO: Reimplement the gethostby* functions using the new winxp+ API, in dns_win32.c, then
148 we can have a dns.c, dns_unix.c and dns_win32.c instead of a messy dns.c full of #ifdef
149*/
150
151/* {{{ proto string gethostbyaddr(string ip_address)
152   Get the Internet host name corresponding to a given IP address */
153PHP_FUNCTION(gethostbyaddr)
154{
155    char *addr;
156    size_t addr_len;
157    zend_string *hostname;
158
159    if (zend_parse_parameters(ZEND_NUM_ARGS(), "s", &addr, &addr_len) == FAILURE) {
160        return;
161    }
162
163    hostname = php_gethostbyaddr(addr);
164
165    if (hostname == NULL) {
166#if HAVE_IPV6 && HAVE_INET_PTON
167        php_error_docref(NULL, E_WARNING, "Address is not a valid IPv4 or IPv6 address");
168#else
169        php_error_docref(NULL, E_WARNING, "Address is not in a.b.c.d form");
170#endif
171        RETVAL_FALSE;
172    } else {
173        RETVAL_STR(hostname);
174    }
175}
176/* }}} */
177
178/* {{{ php_gethostbyaddr */
179static zend_string *php_gethostbyaddr(char *ip)
180{
181#if HAVE_IPV6 && HAVE_INET_PTON
182    struct in6_addr addr6;
183#endif
184    struct in_addr addr;
185    struct hostent *hp;
186
187#if HAVE_IPV6 && HAVE_INET_PTON
188    if (inet_pton(AF_INET6, ip, &addr6)) {
189        hp = gethostbyaddr((char *) &addr6, sizeof(addr6), AF_INET6);
190    } else if (inet_pton(AF_INET, ip, &addr)) {
191        hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
192    } else {
193        return NULL;
194    }
195#else
196    addr.s_addr = inet_addr(ip);
197
198    if (addr.s_addr == -1) {
199        return NULL;
200    }
201
202    hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
203#endif
204
205    if (!hp || hp->h_name == NULL || hp->h_name[0] == '\0') {
206        return zend_string_init(ip, strlen(ip), 0);
207    }
208
209    return zend_string_init(hp->h_name, strlen(hp->h_name), 0);
210}
211/* }}} */
212
213/* {{{ proto string gethostbyname(string hostname)
214   Get the IP address corresponding to a given Internet host name */
215PHP_FUNCTION(gethostbyname)
216{
217    char *hostname;
218    size_t hostname_len;
219
220    if (zend_parse_parameters(ZEND_NUM_ARGS(), "s", &hostname, &hostname_len) == FAILURE) {
221        return;
222    }
223
224    if(hostname_len > MAXFQDNLEN) {
225        /* name too long, protect from CVE-2015-0235 */
226        php_error_docref(NULL, E_WARNING, "Host name is too long, the limit is %d characters", MAXFQDNLEN);
227        RETURN_STRINGL(hostname, hostname_len);
228    }
229
230    RETURN_STR(php_gethostbyname(hostname));
231}
232/* }}} */
233
234/* {{{ proto array gethostbynamel(string hostname)
235   Return a list of IP addresses that a given hostname resolves to. */
236PHP_FUNCTION(gethostbynamel)
237{
238    char *hostname;
239    size_t hostname_len;
240    struct hostent *hp;
241    struct in_addr in;
242    int i;
243
244    if (zend_parse_parameters(ZEND_NUM_ARGS(), "s", &hostname, &hostname_len) == FAILURE) {
245        return;
246    }
247
248    if(hostname_len > MAXFQDNLEN) {
249        /* name too long, protect from CVE-2015-0235 */
250        php_error_docref(NULL TSRMLS_CC, E_WARNING, "Host name is too long, the limit is %d characters", MAXFQDNLEN);
251        RETURN_FALSE;
252    }
253
254    hp = gethostbyname(hostname);
255    if (hp == NULL || hp->h_addr_list == NULL) {
256        RETURN_FALSE;
257    }
258
259    array_init(return_value);
260
261    for (i = 0 ; hp->h_addr_list[i] != 0 ; i++) {
262        in = *(struct in_addr *) hp->h_addr_list[i];
263        add_next_index_string(return_value, inet_ntoa(in));
264    }
265}
266/* }}} */
267
268/* {{{ php_gethostbyname */
269static zend_string *php_gethostbyname(char *name)
270{
271    struct hostent *hp;
272    struct in_addr in;
273    char *address;
274
275    hp = gethostbyname(name);
276
277    if (!hp || !*(hp->h_addr_list)) {
278        return zend_string_init(name, strlen(name), 0);
279    }
280
281    memcpy(&in.s_addr, *(hp->h_addr_list), sizeof(in.s_addr));
282
283    address = inet_ntoa(in);
284    return zend_string_init(address, strlen(address), 0);
285}
286/* }}} */
287
288#if HAVE_FULL_DNS_FUNCS || defined(PHP_WIN32)
289# define PHP_DNS_NUM_TYPES  12  /* Number of DNS Types Supported by PHP currently */
290
291# define PHP_DNS_A      0x00000001
292# define PHP_DNS_NS     0x00000002
293# define PHP_DNS_CNAME  0x00000010
294# define PHP_DNS_SOA    0x00000020
295# define PHP_DNS_PTR    0x00000800
296# define PHP_DNS_HINFO  0x00001000
297# define PHP_DNS_MX     0x00004000
298# define PHP_DNS_TXT    0x00008000
299# define PHP_DNS_A6     0x01000000
300# define PHP_DNS_SRV    0x02000000
301# define PHP_DNS_NAPTR  0x04000000
302# define PHP_DNS_AAAA   0x08000000
303# define PHP_DNS_ANY    0x10000000
304# define PHP_DNS_ALL    (PHP_DNS_A|PHP_DNS_NS|PHP_DNS_CNAME|PHP_DNS_SOA|PHP_DNS_PTR|PHP_DNS_HINFO|PHP_DNS_MX|PHP_DNS_TXT|PHP_DNS_A6|PHP_DNS_SRV|PHP_DNS_NAPTR|PHP_DNS_AAAA)
305#endif /* HAVE_FULL_DNS_FUNCS || defined(PHP_WIN32) */
306
307/* Note: These functions are defined in ext/standard/dns_win32.c for Windows! */
308#if !defined(PHP_WIN32) && (HAVE_DNS_SEARCH_FUNC && !(defined(__BEOS__) || defined(NETWARE)))
309
310#ifndef HFIXEDSZ
311#define HFIXEDSZ        12      /* fixed data in header <arpa/nameser.h> */
312#endif /* HFIXEDSZ */
313
314#ifndef QFIXEDSZ
315#define QFIXEDSZ        4       /* fixed data in query <arpa/nameser.h> */
316#endif /* QFIXEDSZ */
317
318#undef MAXHOSTNAMELEN
319#define MAXHOSTNAMELEN  1024
320
321#ifndef MAXRESOURCERECORDS
322#define MAXRESOURCERECORDS  64
323#endif /* MAXRESOURCERECORDS */
324
325typedef union {
326    HEADER qb1;
327    u_char qb2[65536];
328} querybuf;
329
330/* just a hack to free resources allocated by glibc in __res_nsend()
331 * See also:
332 *   res_thread_freeres() in glibc/resolv/res_init.c
333 *   __libc_res_nsend()   in resolv/res_send.c
334 * */
335
336#if defined(__GLIBC__) && !defined(HAVE_DEPRECATED_DNS_FUNCS)
337#define php_dns_free_res(__res__) _php_dns_free_res(__res__)
338static void _php_dns_free_res(struct __res_state *res) { /* {{{ */
339    int ns;
340    for (ns = 0; ns < MAXNS; ns++) {
341        if (res->_u._ext.nsaddrs[ns] != NULL) {
342            free (res->_u._ext.nsaddrs[ns]);
343            res->_u._ext.nsaddrs[ns] = NULL;
344        }
345    }
346} /* }}} */
347#else
348#define php_dns_free_res(__res__)
349#endif
350
351/* {{{ proto bool dns_check_record(string host [, string type])
352   Check DNS records corresponding to a given Internet host name or IP address */
353PHP_FUNCTION(dns_check_record)
354{
355#ifndef MAXPACKET
356#define MAXPACKET  8192 /* max packet size used internally by BIND */
357#endif
358    u_char ans[MAXPACKET];
359    char *hostname, *rectype = NULL;
360    size_t hostname_len, rectype_len = 0;
361    int type = T_MX, i;
362#if defined(HAVE_DNS_SEARCH)
363    struct sockaddr_storage from;
364    uint32_t fromsize = sizeof(from);
365    dns_handle_t handle;
366#elif defined(HAVE_RES_NSEARCH)
367    struct __res_state state;
368    struct __res_state *handle = &state;
369#endif
370
371    if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|s", &hostname, &hostname_len, &rectype, &rectype_len) == FAILURE) {
372        return;
373    }
374
375    if (hostname_len == 0) {
376        php_error_docref(NULL, E_WARNING, "Host cannot be empty");
377        RETURN_FALSE;
378    }
379
380    if (rectype) {
381        if (!strcasecmp("A",     rectype)) type = T_A;
382        else if (!strcasecmp("NS",    rectype)) type = DNS_T_NS;
383        else if (!strcasecmp("MX",    rectype)) type = DNS_T_MX;
384        else if (!strcasecmp("PTR",   rectype)) type = DNS_T_PTR;
385        else if (!strcasecmp("ANY",   rectype)) type = DNS_T_ANY;
386        else if (!strcasecmp("SOA",   rectype)) type = DNS_T_SOA;
387        else if (!strcasecmp("TXT",   rectype)) type = DNS_T_TXT;
388        else if (!strcasecmp("CNAME", rectype)) type = DNS_T_CNAME;
389        else if (!strcasecmp("AAAA",  rectype)) type = DNS_T_AAAA;
390        else if (!strcasecmp("SRV",   rectype)) type = DNS_T_SRV;
391        else if (!strcasecmp("NAPTR", rectype)) type = DNS_T_NAPTR;
392        else if (!strcasecmp("A6",    rectype)) type = DNS_T_A6;
393        else {
394            php_error_docref(NULL, E_WARNING, "Type '%s' not supported", rectype);
395            RETURN_FALSE;
396        }
397    }
398
399#if defined(HAVE_DNS_SEARCH)
400    handle = dns_open(NULL);
401    if (handle == NULL) {
402        RETURN_FALSE;
403    }
404#elif defined(HAVE_RES_NSEARCH)
405    memset(&state, 0, sizeof(state));
406    if (res_ninit(handle)) {
407            RETURN_FALSE;
408    }
409#else
410    res_init();
411#endif
412
413    RETVAL_TRUE;
414    i = php_dns_search(handle, hostname, C_IN, type, ans, sizeof(ans));
415
416    if (i < 0) {
417        RETVAL_FALSE;
418    }
419
420    php_dns_free_handle(handle);
421}
422/* }}} */
423
424#if HAVE_FULL_DNS_FUNCS
425
426#define CHECKCP(n) do { \
427    if (cp + n > end) { \
428        return NULL; \
429    } \
430} while (0)
431
432/* {{{ php_parserr */
433static u_char *php_parserr(u_char *cp, u_char *end, querybuf *answer, int type_to_fetch, int store, int raw, zval *subarray)
434{
435    u_short type, class, dlen;
436    u_long ttl;
437    long n, i;
438    u_short s;
439    u_char *tp, *p;
440    char name[MAXHOSTNAMELEN];
441    int have_v6_break = 0, in_v6_break = 0;
442
443    ZVAL_UNDEF(subarray);
444
445    n = dn_expand(answer->qb2, end, cp, name, sizeof(name) - 2);
446    if (n < 0) {
447        return NULL;
448    }
449    cp += n;
450
451    CHECKCP(10);
452    GETSHORT(type, cp);
453    GETSHORT(class, cp);
454    GETLONG(ttl, cp);
455    GETSHORT(dlen, cp);
456    CHECKCP(dlen);
457    if (type_to_fetch != T_ANY && type != type_to_fetch) {
458        cp += dlen;
459        return cp;
460    }
461
462    if (!store) {
463        cp += dlen;
464        return cp;
465    }
466
467    array_init(subarray);
468
469    add_assoc_string(subarray, "host", name);
470    add_assoc_string(subarray, "class", "IN");
471    add_assoc_long(subarray, "ttl", ttl);
472    (void) class;
473
474    if (raw) {
475        add_assoc_long(subarray, "type", type);
476        add_assoc_stringl(subarray, "data", (char*) cp, (uint) dlen);
477        cp += dlen;
478        return cp;
479    }
480
481    switch (type) {
482        case DNS_T_A:
483            CHECKCP(4);
484            add_assoc_string(subarray, "type", "A");
485            snprintf(name, sizeof(name), "%d.%d.%d.%d", cp[0], cp[1], cp[2], cp[3]);
486            add_assoc_string(subarray, "ip", name);
487            cp += dlen;
488            break;
489        case DNS_T_MX:
490            CHECKCP(2);
491            add_assoc_string(subarray, "type", "MX");
492            GETSHORT(n, cp);
493            add_assoc_long(subarray, "pri", n);
494            /* no break; */
495        case DNS_T_CNAME:
496            if (type == DNS_T_CNAME) {
497                add_assoc_string(subarray, "type", "CNAME");
498            }
499            /* no break; */
500        case DNS_T_NS:
501            if (type == DNS_T_NS) {
502                add_assoc_string(subarray, "type", "NS");
503            }
504            /* no break; */
505        case DNS_T_PTR:
506            if (type == DNS_T_PTR) {
507                add_assoc_string(subarray, "type", "PTR");
508            }
509            n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
510            if (n < 0) {
511                return NULL;
512            }
513            cp += n;
514            add_assoc_string(subarray, "target", name);
515            break;
516        case DNS_T_HINFO:
517            /* See RFC 1010 for values */
518            add_assoc_string(subarray, "type", "HINFO");
519            CHECKCP(1);
520            n = *cp & 0xFF;
521            cp++;
522            CHECKCP(n);
523            add_assoc_stringl(subarray, "cpu", (char*)cp, n);
524            cp += n;
525            CHECKCP(1);
526            n = *cp & 0xFF;
527            cp++;
528            CHECKCP(n);
529            add_assoc_stringl(subarray, "os", (char*)cp, n);
530            cp += n;
531            break;
532        case DNS_T_TXT:
533            {
534                int l1 = 0, l2 = 0;
535                zval entries;
536                zend_string *tp;
537
538                add_assoc_string(subarray, "type", "TXT");
539                tp = zend_string_alloc(dlen, 0);
540
541                array_init(&entries);
542
543                while (l1 < dlen) {
544                    n = cp[l1];
545                    if ((l1 + n) >= dlen) {
546                        // Invalid chunk length, truncate
547                        n = dlen - (l1 + 1);
548                    }
549                    if (n) {
550                        memcpy(tp->val + l2 , cp + l1 + 1, n);
551                        add_next_index_stringl(&entries, (char *) cp + l1 + 1, n);
552                    }
553                    l1 = l1 + n + 1;
554                    l2 = l2 + n;
555                }
556                tp->val[l2] = '\0';
557                tp->len = l2;
558                cp += dlen;
559
560                add_assoc_str(subarray, "txt", tp);
561                add_assoc_zval(subarray, "entries", &entries);
562            }
563            break;
564        case DNS_T_SOA:
565            add_assoc_string(subarray, "type", "SOA");
566            n = dn_expand(answer->qb2, end, cp, name, (sizeof name) -2);
567            if (n < 0) {
568                return NULL;
569            }
570            cp += n;
571            add_assoc_string(subarray, "mname", name);
572            n = dn_expand(answer->qb2, end, cp, name, (sizeof name) -2);
573            if (n < 0) {
574                return NULL;
575            }
576            cp += n;
577            add_assoc_string(subarray, "rname", name);
578            CHECKCP(5*4);
579            GETLONG(n, cp);
580            add_assoc_long(subarray, "serial", n);
581            GETLONG(n, cp);
582            add_assoc_long(subarray, "refresh", n);
583            GETLONG(n, cp);
584            add_assoc_long(subarray, "retry", n);
585            GETLONG(n, cp);
586            add_assoc_long(subarray, "expire", n);
587            GETLONG(n, cp);
588            add_assoc_long(subarray, "minimum-ttl", n);
589            break;
590        case DNS_T_AAAA:
591            tp = (u_char*)name;
592            CHECKCP(8*2);
593            for(i=0; i < 8; i++) {
594                GETSHORT(s, cp);
595                if (s != 0) {
596                    if (tp > (u_char *)name) {
597                        in_v6_break = 0;
598                        tp[0] = ':';
599                        tp++;
600                    }
601                    tp += sprintf((char*)tp,"%x",s);
602                } else {
603                    if (!have_v6_break) {
604                        have_v6_break = 1;
605                        in_v6_break = 1;
606                        tp[0] = ':';
607                        tp++;
608                    } else if (!in_v6_break) {
609                        tp[0] = ':';
610                        tp++;
611                        tp[0] = '0';
612                        tp++;
613                    }
614                }
615            }
616            if (have_v6_break && in_v6_break) {
617                tp[0] = ':';
618                tp++;
619            }
620            tp[0] = '\0';
621            add_assoc_string(subarray, "type", "AAAA");
622            add_assoc_string(subarray, "ipv6", name);
623            break;
624        case DNS_T_A6:
625            p = cp;
626            add_assoc_string(subarray, "type", "A6");
627            CHECKCP(1);
628            n = ((int)cp[0]) & 0xFF;
629            cp++;
630            add_assoc_long(subarray, "masklen", n);
631            tp = (u_char*)name;
632            if (n > 15) {
633                have_v6_break = 1;
634                in_v6_break = 1;
635                tp[0] = ':';
636                tp++;
637            }
638            if (n % 16 > 8) {
639                /* Partial short */
640                if (cp[0] != 0) {
641                    if (tp > (u_char *)name) {
642                        in_v6_break = 0;
643                        tp[0] = ':';
644                        tp++;
645                    }
646                    sprintf((char*)tp, "%x", cp[0] & 0xFF);
647                } else {
648                    if (!have_v6_break) {
649                        have_v6_break = 1;
650                        in_v6_break = 1;
651                        tp[0] = ':';
652                        tp++;
653                    } else if (!in_v6_break) {
654                        tp[0] = ':';
655                        tp++;
656                        tp[0] = '0';
657                        tp++;
658                    }
659                }
660                cp++;
661            }
662            for (i = (n + 8) / 16; i < 8; i++) {
663                CHECKCP(2);
664                GETSHORT(s, cp);
665                if (s != 0) {
666                    if (tp > (u_char *)name) {
667                        in_v6_break = 0;
668                        tp[0] = ':';
669                        tp++;
670                    }
671                    tp += sprintf((char*)tp,"%x",s);
672                } else {
673                    if (!have_v6_break) {
674                        have_v6_break = 1;
675                        in_v6_break = 1;
676                        tp[0] = ':';
677                        tp++;
678                    } else if (!in_v6_break) {
679                        tp[0] = ':';
680                        tp++;
681                        tp[0] = '0';
682                        tp++;
683                    }
684                }
685            }
686            if (have_v6_break && in_v6_break) {
687                tp[0] = ':';
688                tp++;
689            }
690            tp[0] = '\0';
691            add_assoc_string(subarray, "ipv6", name);
692            if (cp < p + dlen) {
693                n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
694                if (n < 0) {
695                    return NULL;
696                }
697                cp += n;
698                add_assoc_string(subarray, "chain", name);
699            }
700            break;
701        case DNS_T_SRV:
702            CHECKCP(3*2);
703            add_assoc_string(subarray, "type", "SRV");
704            GETSHORT(n, cp);
705            add_assoc_long(subarray, "pri", n);
706            GETSHORT(n, cp);
707            add_assoc_long(subarray, "weight", n);
708            GETSHORT(n, cp);
709            add_assoc_long(subarray, "port", n);
710            n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
711            if (n < 0) {
712                return NULL;
713            }
714            cp += n;
715            add_assoc_string(subarray, "target", name);
716            break;
717        case DNS_T_NAPTR:
718            CHECKCP(2*2);
719            add_assoc_string(subarray, "type", "NAPTR");
720            GETSHORT(n, cp);
721            add_assoc_long(subarray, "order", n);
722            GETSHORT(n, cp);
723            add_assoc_long(subarray, "pref", n);
724
725            CHECKCP(1);
726            n = (cp[0] & 0xFF);
727            cp++;
728            CHECKCP(n);
729            add_assoc_stringl(subarray, "flags", (char*)cp, n);
730            cp += n;
731
732            CHECKCP(1);
733            n = (cp[0] & 0xFF);
734            cp++;
735            CHECKCP(n);
736            add_assoc_stringl(subarray, "services", (char*)cp, n);
737            cp += n;
738
739            CHECKCP(1);
740            n = (cp[0] & 0xFF);
741            cp++;
742            CHECKCP(n);
743            add_assoc_stringl(subarray, "regex", (char*)cp, n);
744            cp += n;
745
746            n = dn_expand(answer->qb2, end, cp, name, (sizeof name) - 2);
747            if (n < 0) {
748                return NULL;
749            }
750            cp += n;
751            add_assoc_string(subarray, "replacement", name);
752            break;
753        default:
754            zval_ptr_dtor(subarray);
755            ZVAL_UNDEF(subarray);
756            cp += dlen;
757            break;
758    }
759
760    return cp;
761}
762/* }}} */
763
764/* {{{ proto array|false dns_get_record(string hostname [, int type[, array authns, array addtl]])
765   Get any Resource Record corresponding to a given Internet host name */
766PHP_FUNCTION(dns_get_record)
767{
768    char *hostname;
769    size_t hostname_len;
770    long type_param = PHP_DNS_ANY;
771    zval *authns = NULL, *addtl = NULL;
772    int type_to_fetch;
773#if defined(HAVE_DNS_SEARCH)
774    struct sockaddr_storage from;
775    uint32_t fromsize = sizeof(from);
776    dns_handle_t handle;
777#elif defined(HAVE_RES_NSEARCH)
778    struct __res_state state;
779    struct __res_state *handle = &state;
780#endif
781    HEADER *hp;
782    querybuf answer;
783    u_char *cp = NULL, *end = NULL;
784    int n, qd, an, ns = 0, ar = 0;
785    int type, first_query = 1, store_results = 1;
786    zend_bool raw = 0;
787
788    if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|lz!z!b",
789            &hostname, &hostname_len, &type_param, &authns, &addtl, &raw) == FAILURE) {
790        return;
791    }
792
793    if (authns) {
794        zval_dtor(authns);
795        array_init(authns);
796    }
797    if (addtl) {
798        zval_dtor(addtl);
799        array_init(addtl);
800    }
801
802    if (!raw) {
803        if ((type_param & ~PHP_DNS_ALL) && (type_param != PHP_DNS_ANY)) {
804            php_error_docref(NULL, E_WARNING, "Type '%ld' not supported", type_param);
805            RETURN_FALSE;
806        }
807    } else {
808        if ((type_param < 1) || (type_param > 0xFFFF)) {
809            php_error_docref(NULL, E_WARNING,
810                "Numeric DNS record type must be between 1 and 65535, '%ld' given", type_param);
811            RETURN_FALSE;
812        }
813    }
814
815    /* Initialize the return array */
816    array_init(return_value);
817
818    /* - We emulate an or'ed type mask by querying type by type. (Steps 0 - NUMTYPES-1 )
819     *   If additional info is wanted we check again with DNS_T_ANY (step NUMTYPES / NUMTYPES+1 )
820     *   store_results is used to skip storing the results retrieved in step
821     *   NUMTYPES+1 when results were already fetched.
822     * - In case of PHP_DNS_ANY we use the directly fetch DNS_T_ANY. (step NUMTYPES+1 )
823     * - In case of raw mode, we query only the requestd type instead of looping type by type
824     *   before going with the additional info stuff.
825     */
826
827    if (raw) {
828        type = -1;
829    } else if (type_param == PHP_DNS_ANY) {
830        type = PHP_DNS_NUM_TYPES + 1;
831    } else {
832        type = 0;
833    }
834
835    for ( ;
836        type < (addtl ? (PHP_DNS_NUM_TYPES + 2) : PHP_DNS_NUM_TYPES) || first_query;
837        type++
838    ) {
839        first_query = 0;
840        switch (type) {
841            case -1: /* raw */
842                type_to_fetch = type_param;
843                /* skip over the rest and go directly to additional records */
844                type = PHP_DNS_NUM_TYPES - 1;
845                break;
846            case 0:
847                type_to_fetch = type_param&PHP_DNS_A     ? DNS_T_A     : 0;
848                break;
849            case 1:
850                type_to_fetch = type_param&PHP_DNS_NS    ? DNS_T_NS    : 0;
851                break;
852            case 2:
853                type_to_fetch = type_param&PHP_DNS_CNAME ? DNS_T_CNAME : 0;
854                break;
855            case 3:
856                type_to_fetch = type_param&PHP_DNS_SOA   ? DNS_T_SOA   : 0;
857                break;
858            case 4:
859                type_to_fetch = type_param&PHP_DNS_PTR   ? DNS_T_PTR   : 0;
860                break;
861            case 5:
862                type_to_fetch = type_param&PHP_DNS_HINFO ? DNS_T_HINFO : 0;
863                break;
864            case 6:
865                type_to_fetch = type_param&PHP_DNS_MX    ? DNS_T_MX    : 0;
866                break;
867            case 7:
868                type_to_fetch = type_param&PHP_DNS_TXT   ? DNS_T_TXT   : 0;
869                break;
870            case 8:
871                type_to_fetch = type_param&PHP_DNS_AAAA  ? DNS_T_AAAA  : 0;
872                break;
873            case 9:
874                type_to_fetch = type_param&PHP_DNS_SRV   ? DNS_T_SRV   : 0;
875                break;
876            case 10:
877                type_to_fetch = type_param&PHP_DNS_NAPTR ? DNS_T_NAPTR : 0;
878                break;
879            case 11:
880                type_to_fetch = type_param&PHP_DNS_A6    ? DNS_T_A6 : 0;
881                break;
882            case PHP_DNS_NUM_TYPES:
883                store_results = 0;
884                continue;
885            default:
886            case (PHP_DNS_NUM_TYPES + 1):
887                type_to_fetch = DNS_T_ANY;
888                break;
889        }
890
891        if (type_to_fetch) {
892#if defined(HAVE_DNS_SEARCH)
893            handle = dns_open(NULL);
894            if (handle == NULL) {
895                zval_dtor(return_value);
896                RETURN_FALSE;
897            }
898#elif defined(HAVE_RES_NSEARCH)
899            memset(&state, 0, sizeof(state));
900            if (res_ninit(handle)) {
901                zval_dtor(return_value);
902                RETURN_FALSE;
903            }
904#else
905            res_init();
906#endif
907
908            n = php_dns_search(handle, hostname, C_IN, type_to_fetch, answer.qb2, sizeof answer);
909
910            if (n < 0) {
911                php_dns_free_handle(handle);
912                switch (h_errno) {
913                    case NO_DATA:
914                    case HOST_NOT_FOUND:
915                        continue;
916
917                    case NO_RECOVERY:
918                        php_error_docref(NULL, E_WARNING, "An unexpected server failure occurred.");
919                        break;
920
921                    case TRY_AGAIN:
922                        php_error_docref(NULL, E_WARNING, "A temporary server error occurred.");
923                        break;
924
925                    default:
926                        php_error_docref(NULL, E_WARNING, "DNS Query failed");
927                }
928                zval_dtor(return_value);
929                RETURN_FALSE;
930            }
931
932            cp = answer.qb2 + HFIXEDSZ;
933            end = answer.qb2 + n;
934            hp = (HEADER *)&answer;
935            qd = ntohs(hp->qdcount);
936            an = ntohs(hp->ancount);
937            ns = ntohs(hp->nscount);
938            ar = ntohs(hp->arcount);
939
940            /* Skip QD entries, they're only used by dn_expand later on */
941            while (qd-- > 0) {
942                n = dn_skipname(cp, end);
943                if (n < 0) {
944                    php_error_docref(NULL, E_WARNING, "Unable to parse DNS data received");
945                    zval_dtor(return_value);
946                    php_dns_free_handle(handle);
947                    RETURN_FALSE;
948                }
949                cp += n + QFIXEDSZ;
950            }
951
952            /* YAY! Our real answers! */
953            while (an-- && cp && cp < end) {
954                zval retval;
955
956                cp = php_parserr(cp, end, &answer, type_to_fetch, store_results, raw, &retval);
957                if (Z_TYPE(retval) != IS_UNDEF && store_results) {
958                    add_next_index_zval(return_value, &retval);
959                }
960            }
961
962            if (authns || addtl) {
963                /* List of Authoritative Name Servers
964                 * Process when only requesting addtl so that we can skip through the section
965                 */
966                while (ns-- > 0 && cp && cp < end) {
967                    zval retval;
968
969                    cp = php_parserr(cp, end, &answer, DNS_T_ANY, authns != NULL, raw, &retval);
970                    if (Z_TYPE(retval) != IS_UNDEF) {
971                        add_next_index_zval(authns, &retval);
972                    }
973                }
974            }
975
976            if (addtl) {
977                /* Additional records associated with authoritative name servers */
978                while (ar-- > 0 && cp && cp < end) {
979                    zval retval;
980
981                    cp = php_parserr(cp, end, &answer, DNS_T_ANY, 1, raw, &retval);
982                    if (Z_TYPE(retval) != IS_UNDEF) {
983                        add_next_index_zval(addtl, &retval);
984                    }
985                }
986            }
987            php_dns_free_handle(handle);
988        }
989    }
990}
991/* }}} */
992
993/* {{{ proto bool dns_get_mx(string hostname, array mxhosts [, array weight])
994   Get MX records corresponding to a given Internet host name */
995PHP_FUNCTION(dns_get_mx)
996{
997    char *hostname;
998    size_t hostname_len;
999    zval *mx_list, *weight_list = NULL;
1000    int count, qdc;
1001    u_short type, weight;
1002    u_char ans[MAXPACKET];
1003    char buf[MAXHOSTNAMELEN];
1004    HEADER *hp;
1005    u_char *cp, *end;
1006    int i;
1007#if defined(HAVE_DNS_SEARCH)
1008    struct sockaddr_storage from;
1009    uint32_t fromsize = sizeof(from);
1010    dns_handle_t handle;
1011#elif defined(HAVE_RES_NSEARCH)
1012    struct __res_state state;
1013    struct __res_state *handle = &state;
1014#endif
1015
1016    if (zend_parse_parameters(ZEND_NUM_ARGS(), "sz/|z/", &hostname, &hostname_len, &mx_list, &weight_list) == FAILURE) {
1017        return;
1018    }
1019
1020    zval_dtor(mx_list);
1021    array_init(mx_list);
1022
1023    if (weight_list) {
1024        zval_dtor(weight_list);
1025        array_init(weight_list);
1026    }
1027
1028#if defined(HAVE_DNS_SEARCH)
1029    handle = dns_open(NULL);
1030    if (handle == NULL) {
1031        RETURN_FALSE;
1032    }
1033#elif defined(HAVE_RES_NSEARCH)
1034    memset(&state, 0, sizeof(state));
1035    if (res_ninit(handle)) {
1036            RETURN_FALSE;
1037    }
1038#else
1039    res_init();
1040#endif
1041
1042    i = php_dns_search(handle, hostname, C_IN, DNS_T_MX, (u_char *)&ans, sizeof(ans));
1043    if (i < 0) {
1044        RETURN_FALSE;
1045    }
1046    if (i > (int)sizeof(ans)) {
1047        i = sizeof(ans);
1048    }
1049    hp = (HEADER *)&ans;
1050    cp = (u_char *)&ans + HFIXEDSZ;
1051    end = (u_char *)&ans +i;
1052    for (qdc = ntohs((unsigned short)hp->qdcount); qdc--; cp += i + QFIXEDSZ) {
1053        if ((i = dn_skipname(cp, end)) < 0 ) {
1054            php_dns_free_handle(handle);
1055            RETURN_FALSE;
1056        }
1057    }
1058    count = ntohs((unsigned short)hp->ancount);
1059    while (--count >= 0 && cp < end) {
1060        if ((i = dn_skipname(cp, end)) < 0 ) {
1061            php_dns_free_handle(handle);
1062            RETURN_FALSE;
1063        }
1064        cp += i;
1065        GETSHORT(type, cp);
1066        cp += INT16SZ + INT32SZ;
1067        GETSHORT(i, cp);
1068        if (type != DNS_T_MX) {
1069            cp += i;
1070            continue;
1071        }
1072        GETSHORT(weight, cp);
1073        if ((i = dn_expand(ans, end, cp, buf, sizeof(buf)-1)) < 0) {
1074            php_dns_free_handle(handle);
1075            RETURN_FALSE;
1076        }
1077        cp += i;
1078        add_next_index_string(mx_list, buf);
1079        if (weight_list) {
1080            add_next_index_long(weight_list, weight);
1081        }
1082    }
1083    php_dns_free_handle(handle);
1084    RETURN_TRUE;
1085}
1086/* }}} */
1087#endif /* HAVE_FULL_DNS_FUNCS */
1088#endif /* !defined(PHP_WIN32) && (HAVE_DNS_SEARCH_FUNC && !(defined(__BEOS__) || defined(NETWARE))) */
1089
1090#if HAVE_FULL_DNS_FUNCS || defined(PHP_WIN32)
1091PHP_MINIT_FUNCTION(dns) {
1092    REGISTER_LONG_CONSTANT("DNS_A",     PHP_DNS_A,     CONST_CS | CONST_PERSISTENT);
1093    REGISTER_LONG_CONSTANT("DNS_NS",    PHP_DNS_NS,    CONST_CS | CONST_PERSISTENT);
1094    REGISTER_LONG_CONSTANT("DNS_CNAME", PHP_DNS_CNAME, CONST_CS | CONST_PERSISTENT);
1095    REGISTER_LONG_CONSTANT("DNS_SOA",   PHP_DNS_SOA,   CONST_CS | CONST_PERSISTENT);
1096    REGISTER_LONG_CONSTANT("DNS_PTR",   PHP_DNS_PTR,   CONST_CS | CONST_PERSISTENT);
1097    REGISTER_LONG_CONSTANT("DNS_HINFO", PHP_DNS_HINFO, CONST_CS | CONST_PERSISTENT);
1098    REGISTER_LONG_CONSTANT("DNS_MX",    PHP_DNS_MX,    CONST_CS | CONST_PERSISTENT);
1099    REGISTER_LONG_CONSTANT("DNS_TXT",   PHP_DNS_TXT,   CONST_CS | CONST_PERSISTENT);
1100    REGISTER_LONG_CONSTANT("DNS_SRV",   PHP_DNS_SRV,   CONST_CS | CONST_PERSISTENT);
1101    REGISTER_LONG_CONSTANT("DNS_NAPTR", PHP_DNS_NAPTR, CONST_CS | CONST_PERSISTENT);
1102    REGISTER_LONG_CONSTANT("DNS_AAAA",  PHP_DNS_AAAA,  CONST_CS | CONST_PERSISTENT);
1103    REGISTER_LONG_CONSTANT("DNS_A6",    PHP_DNS_A6,    CONST_CS | CONST_PERSISTENT);
1104    REGISTER_LONG_CONSTANT("DNS_ANY",   PHP_DNS_ANY,   CONST_CS | CONST_PERSISTENT);
1105    REGISTER_LONG_CONSTANT("DNS_ALL",   PHP_DNS_ALL,   CONST_CS | CONST_PERSISTENT);
1106    return SUCCESS;
1107}
1108#endif /* HAVE_FULL_DNS_FUNCS */
1109
1110/*
1111 * Local variables:
1112 * tab-width: 4
1113 * c-basic-offset: 4
1114 * End:
1115 * vim600: sw=4 ts=4 fdm=marker
1116 * vim<600: sw=4 ts=4
1117 */
1118