1/*
2   +----------------------------------------------------------------------+
3   | PHP Version 5                                                        |
4   +----------------------------------------------------------------------+
5   | Copyright (c) 1997-2013 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 char *php_gethostbyaddr(char *ip);
124static char *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 TSRMLS_CC, E_WARNING, "unable to fetch host [%d]: %s", errno, strerror(errno));
139        RETURN_FALSE;
140    }
141
142    RETURN_STRING(buf, 1);
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    int addr_len;
157    char *hostname;
158
159    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "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 TSRMLS_CC, E_WARNING, "Address is not a valid IPv4 or IPv6 address");
168#else
169        php_error_docref(NULL TSRMLS_CC, E_WARNING, "Address is not in a.b.c.d form");
170#endif
171        RETVAL_FALSE;
172    } else {
173        RETVAL_STRING(hostname, 0);
174    }
175}
176/* }}} */
177
178/* {{{ php_gethostbyaddr */
179static char *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 estrdup(ip);
207    }
208
209    return estrdup(hp->h_name);
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    int hostname_len;
219    char *addr;
220
221    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &hostname, &hostname_len) == FAILURE) {
222        return;
223    }
224
225    addr = php_gethostbyname(hostname);
226
227    RETVAL_STRING(addr, 0);
228}
229/* }}} */
230
231/* {{{ proto array gethostbynamel(string hostname)
232   Return a list of IP addresses that a given hostname resolves to. */
233PHP_FUNCTION(gethostbynamel)
234{
235    char *hostname;
236    int hostname_len;
237    struct hostent *hp;
238    struct in_addr in;
239    int i;
240
241    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &hostname, &hostname_len) == FAILURE) {
242        return;
243    }
244
245    hp = gethostbyname(hostname);
246    if (hp == NULL || hp->h_addr_list == NULL) {
247        RETURN_FALSE;
248    }
249
250    array_init(return_value);
251
252    for (i = 0 ; hp->h_addr_list[i] != 0 ; i++) {
253        in = *(struct in_addr *) hp->h_addr_list[i];
254        add_next_index_string(return_value, inet_ntoa(in), 1);
255    }
256}
257/* }}} */
258
259/* {{{ php_gethostbyname */
260static char *php_gethostbyname(char *name)
261{
262    struct hostent *hp;
263    struct in_addr in;
264
265    hp = gethostbyname(name);
266
267    if (!hp || !*(hp->h_addr_list)) {
268        return estrdup(name);
269    }
270
271    memcpy(&in.s_addr, *(hp->h_addr_list), sizeof(in.s_addr));
272
273    return estrdup(inet_ntoa(in));
274}
275/* }}} */
276
277#if HAVE_FULL_DNS_FUNCS || defined(PHP_WIN32)
278# define PHP_DNS_NUM_TYPES  12  /* Number of DNS Types Supported by PHP currently */
279
280# define PHP_DNS_A      0x00000001
281# define PHP_DNS_NS     0x00000002
282# define PHP_DNS_CNAME  0x00000010
283# define PHP_DNS_SOA    0x00000020
284# define PHP_DNS_PTR    0x00000800
285# define PHP_DNS_HINFO  0x00001000
286# define PHP_DNS_MX     0x00004000
287# define PHP_DNS_TXT    0x00008000
288# define PHP_DNS_A6     0x01000000
289# define PHP_DNS_SRV    0x02000000
290# define PHP_DNS_NAPTR  0x04000000
291# define PHP_DNS_AAAA   0x08000000
292# define PHP_DNS_ANY    0x10000000
293# 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)
294#endif /* HAVE_FULL_DNS_FUNCS || defined(PHP_WIN32) */
295
296/* Note: These functions are defined in ext/standard/dns_win32.c for Windows! */
297#if !defined(PHP_WIN32) && (HAVE_DNS_SEARCH_FUNC && !(defined(__BEOS__) || defined(NETWARE)))
298
299#ifndef HFIXEDSZ
300#define HFIXEDSZ        12      /* fixed data in header <arpa/nameser.h> */
301#endif /* HFIXEDSZ */
302
303#ifndef QFIXEDSZ
304#define QFIXEDSZ        4       /* fixed data in query <arpa/nameser.h> */
305#endif /* QFIXEDSZ */
306
307#undef MAXHOSTNAMELEN
308#define MAXHOSTNAMELEN  1024
309
310#ifndef MAXRESOURCERECORDS
311#define MAXRESOURCERECORDS  64
312#endif /* MAXRESOURCERECORDS */
313
314typedef union {
315    HEADER qb1;
316    u_char qb2[65536];
317} querybuf;
318
319/* just a hack to free resources allocated by glibc in __res_nsend()
320 * See also:
321 *   res_thread_freeres() in glibc/resolv/res_init.c
322 *   __libc_res_nsend()   in resolv/res_send.c
323 * */
324
325#if defined(__GLIBC__) && !defined(HAVE_DEPRECATED_DNS_FUNCS)
326#define php_dns_free_res(__res__) _php_dns_free_res(__res__)
327static void _php_dns_free_res(struct __res_state res) { /* {{{ */
328    int ns;
329    for (ns = 0; ns < MAXNS; ns++) {
330        if (res._u._ext.nsaddrs[ns] != NULL) {
331            free (res._u._ext.nsaddrs[ns]);
332            res._u._ext.nsaddrs[ns] = NULL;
333        }
334    }
335} /* }}} */
336#else
337#define php_dns_free_res(__res__)
338#endif
339
340/* {{{ proto bool dns_check_record(string host [, string type])
341   Check DNS records corresponding to a given Internet host name or IP address */
342PHP_FUNCTION(dns_check_record)
343{
344#ifndef MAXPACKET
345#define MAXPACKET  8192 /* max packet size used internally by BIND */
346#endif
347    u_char ans[MAXPACKET];
348    char *hostname, *rectype = NULL;
349    int hostname_len, rectype_len = 0;
350    int type = T_MX, i;
351#if defined(HAVE_DNS_SEARCH)
352    struct sockaddr_storage from;
353    uint32_t fromsize = sizeof(from);
354    dns_handle_t handle;
355#elif defined(HAVE_RES_NSEARCH)
356    struct __res_state state;
357    struct __res_state *handle = &state;
358#endif
359
360    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|s", &hostname, &hostname_len, &rectype, &rectype_len) == FAILURE) {
361        return;
362    }
363
364    if (hostname_len == 0) {
365        php_error_docref(NULL TSRMLS_CC, E_WARNING, "Host cannot be empty");
366        RETURN_FALSE;
367    }
368
369    if (rectype) {
370        if (!strcasecmp("A",     rectype)) type = T_A;
371        else if (!strcasecmp("NS",    rectype)) type = DNS_T_NS;
372        else if (!strcasecmp("MX",    rectype)) type = DNS_T_MX;
373        else if (!strcasecmp("PTR",   rectype)) type = DNS_T_PTR;
374        else if (!strcasecmp("ANY",   rectype)) type = DNS_T_ANY;
375        else if (!strcasecmp("SOA",   rectype)) type = DNS_T_SOA;
376        else if (!strcasecmp("TXT",   rectype)) type = DNS_T_TXT;
377        else if (!strcasecmp("CNAME", rectype)) type = DNS_T_CNAME;
378        else if (!strcasecmp("AAAA",  rectype)) type = DNS_T_AAAA;
379        else if (!strcasecmp("SRV",   rectype)) type = DNS_T_SRV;
380        else if (!strcasecmp("NAPTR", rectype)) type = DNS_T_NAPTR;
381        else if (!strcasecmp("A6",    rectype)) type = DNS_T_A6;
382        else {
383            php_error_docref(NULL TSRMLS_CC, E_WARNING, "Type '%s' not supported", rectype);
384            RETURN_FALSE;
385        }
386    }
387
388#if defined(HAVE_DNS_SEARCH)
389    handle = dns_open(NULL);
390    if (handle == NULL) {
391        RETURN_FALSE;
392    }
393#elif defined(HAVE_RES_NSEARCH)
394    memset(&state, 0, sizeof(state));
395    if (res_ninit(handle)) {
396            RETURN_FALSE;
397    }
398#else
399    res_init();
400#endif
401
402    RETVAL_TRUE;
403    i = php_dns_search(handle, hostname, C_IN, type, ans, sizeof(ans));
404
405    if (i < 0) {
406        RETVAL_FALSE;
407    }
408
409    php_dns_free_handle(handle);
410}
411/* }}} */
412
413#if HAVE_FULL_DNS_FUNCS
414
415/* {{{ php_parserr */
416static u_char *php_parserr(u_char *cp, querybuf *answer, int type_to_fetch, int store, zval **subarray)
417{
418    u_short type, class, dlen;
419    u_long ttl;
420    long n, i;
421    u_short s;
422    u_char *tp, *p;
423    char name[MAXHOSTNAMELEN];
424    int have_v6_break = 0, in_v6_break = 0;
425
426    *subarray = NULL;
427
428    n = dn_expand(answer->qb2, answer->qb2+65536, cp, name, sizeof(name) - 2);
429    if (n < 0) {
430        return NULL;
431    }
432    cp += n;
433
434    GETSHORT(type, cp);
435    GETSHORT(class, cp);
436    GETLONG(ttl, cp);
437    GETSHORT(dlen, cp);
438    if (type_to_fetch != T_ANY && type != type_to_fetch) {
439        cp += dlen;
440        return cp;
441    }
442
443    if (!store) {
444        cp += dlen;
445        return cp;
446    }
447
448    ALLOC_INIT_ZVAL(*subarray);
449    array_init(*subarray);
450
451    add_assoc_string(*subarray, "host", name, 1);
452    switch (type) {
453        case DNS_T_A:
454            add_assoc_string(*subarray, "type", "A", 1);
455            snprintf(name, sizeof(name), "%d.%d.%d.%d", cp[0], cp[1], cp[2], cp[3]);
456            add_assoc_string(*subarray, "ip", name, 1);
457            cp += dlen;
458            break;
459        case DNS_T_MX:
460            add_assoc_string(*subarray, "type", "MX", 1);
461            GETSHORT(n, cp);
462            add_assoc_long(*subarray, "pri", n);
463            /* no break; */
464        case DNS_T_CNAME:
465            if (type == DNS_T_CNAME) {
466                add_assoc_string(*subarray, "type", "CNAME", 1);
467            }
468            /* no break; */
469        case DNS_T_NS:
470            if (type == DNS_T_NS) {
471                add_assoc_string(*subarray, "type", "NS", 1);
472            }
473            /* no break; */
474        case DNS_T_PTR:
475            if (type == DNS_T_PTR) {
476                add_assoc_string(*subarray, "type", "PTR", 1);
477            }
478            n = dn_expand(answer->qb2, answer->qb2+65536, cp, name, (sizeof name) - 2);
479            if (n < 0) {
480                return NULL;
481            }
482            cp += n;
483            add_assoc_string(*subarray, "target", name, 1);
484            break;
485        case DNS_T_HINFO:
486            /* See RFC 1010 for values */
487            add_assoc_string(*subarray, "type", "HINFO", 1);
488            n = *cp & 0xFF;
489            cp++;
490            add_assoc_stringl(*subarray, "cpu", (char*)cp, n, 1);
491            cp += n;
492            n = *cp & 0xFF;
493            cp++;
494            add_assoc_stringl(*subarray, "os", (char*)cp, n, 1);
495            cp += n;
496            break;
497        case DNS_T_TXT:
498            {
499                int ll = 0;
500                zval *entries = NULL;
501
502                add_assoc_string(*subarray, "type", "TXT", 1);
503                tp = emalloc(dlen + 1);
504
505                MAKE_STD_ZVAL(entries);
506                array_init(entries);
507
508                while (ll < dlen) {
509                    n = cp[ll];
510                    memcpy(tp + ll , cp + ll + 1, n);
511                    add_next_index_stringl(entries, cp + ll + 1, n, 1);
512                    ll = ll + n + 1;
513                }
514                tp[dlen] = '\0';
515                cp += dlen;
516
517                add_assoc_stringl(*subarray, "txt", tp, (dlen>0)?dlen - 1:0, 0);
518                add_assoc_zval(*subarray, "entries", entries);
519            }
520            break;
521        case DNS_T_SOA:
522            add_assoc_string(*subarray, "type", "SOA", 1);
523            n = dn_expand(answer->qb2, answer->qb2+65536, cp, name, (sizeof name) -2);
524            if (n < 0) {
525                return NULL;
526            }
527            cp += n;
528            add_assoc_string(*subarray, "mname", name, 1);
529            n = dn_expand(answer->qb2, answer->qb2+65536, cp, name, (sizeof name) -2);
530            if (n < 0) {
531                return NULL;
532            }
533            cp += n;
534            add_assoc_string(*subarray, "rname", name, 1);
535            GETLONG(n, cp);
536            add_assoc_long(*subarray, "serial", n);
537            GETLONG(n, cp);
538            add_assoc_long(*subarray, "refresh", n);
539            GETLONG(n, cp);
540            add_assoc_long(*subarray, "retry", n);
541            GETLONG(n, cp);
542            add_assoc_long(*subarray, "expire", n);
543            GETLONG(n, cp);
544            add_assoc_long(*subarray, "minimum-ttl", n);
545            break;
546        case DNS_T_AAAA:
547            tp = (u_char*)name;
548            for(i=0; i < 8; i++) {
549                GETSHORT(s, cp);
550                if (s != 0) {
551                    if (tp > (u_char *)name) {
552                        in_v6_break = 0;
553                        tp[0] = ':';
554                        tp++;
555                    }
556                    tp += sprintf((char*)tp,"%x",s);
557                } else {
558                    if (!have_v6_break) {
559                        have_v6_break = 1;
560                        in_v6_break = 1;
561                        tp[0] = ':';
562                        tp++;
563                    } else if (!in_v6_break) {
564                        tp[0] = ':';
565                        tp++;
566                        tp[0] = '0';
567                        tp++;
568                    }
569                }
570            }
571            if (have_v6_break && in_v6_break) {
572                tp[0] = ':';
573                tp++;
574            }
575            tp[0] = '\0';
576            add_assoc_string(*subarray, "type", "AAAA", 1);
577            add_assoc_string(*subarray, "ipv6", name, 1);
578            break;
579        case DNS_T_A6:
580            p = cp;
581            add_assoc_string(*subarray, "type", "A6", 1);
582            n = ((int)cp[0]) & 0xFF;
583            cp++;
584            add_assoc_long(*subarray, "masklen", n);
585            tp = (u_char*)name;
586            if (n > 15) {
587                have_v6_break = 1;
588                in_v6_break = 1;
589                tp[0] = ':';
590                tp++;
591            }
592            if (n % 16 > 8) {
593                /* Partial short */
594                if (cp[0] != 0) {
595                    if (tp > (u_char *)name) {
596                        in_v6_break = 0;
597                        tp[0] = ':';
598                        tp++;
599                    }
600                    sprintf((char*)tp, "%x", cp[0] & 0xFF);
601                } else {
602                    if (!have_v6_break) {
603                        have_v6_break = 1;
604                        in_v6_break = 1;
605                        tp[0] = ':';
606                        tp++;
607                    } else if (!in_v6_break) {
608                        tp[0] = ':';
609                        tp++;
610                        tp[0] = '0';
611                        tp++;
612                    }
613                }
614                cp++;
615            }
616            for (i = (n + 8) / 16; i < 8; i++) {
617                GETSHORT(s, cp);
618                if (s != 0) {
619                    if (tp > (u_char *)name) {
620                        in_v6_break = 0;
621                        tp[0] = ':';
622                        tp++;
623                    }
624                    tp += sprintf((char*)tp,"%x",s);
625                } else {
626                    if (!have_v6_break) {
627                        have_v6_break = 1;
628                        in_v6_break = 1;
629                        tp[0] = ':';
630                        tp++;
631                    } else if (!in_v6_break) {
632                        tp[0] = ':';
633                        tp++;
634                        tp[0] = '0';
635                        tp++;
636                    }
637                }
638            }
639            if (have_v6_break && in_v6_break) {
640                tp[0] = ':';
641                tp++;
642            }
643            tp[0] = '\0';
644            add_assoc_string(*subarray, "ipv6", name, 1);
645            if (cp < p + dlen) {
646                n = dn_expand(answer->qb2, answer->qb2+65536, cp, name, (sizeof name) - 2);
647                if (n < 0) {
648                    return NULL;
649                }
650                cp += n;
651                add_assoc_string(*subarray, "chain", name, 1);
652            }
653            break;
654        case DNS_T_SRV:
655            add_assoc_string(*subarray, "type", "SRV", 1);
656            GETSHORT(n, cp);
657            add_assoc_long(*subarray, "pri", n);
658            GETSHORT(n, cp);
659            add_assoc_long(*subarray, "weight", n);
660            GETSHORT(n, cp);
661            add_assoc_long(*subarray, "port", n);
662            n = dn_expand(answer->qb2, answer->qb2+65536, cp, name, (sizeof name) - 2);
663            if (n < 0) {
664                return NULL;
665            }
666            cp += n;
667            add_assoc_string(*subarray, "target", name, 1);
668            break;
669        case DNS_T_NAPTR:
670            add_assoc_string(*subarray, "type", "NAPTR", 1);
671            GETSHORT(n, cp);
672            add_assoc_long(*subarray, "order", n);
673            GETSHORT(n, cp);
674            add_assoc_long(*subarray, "pref", n);
675            n = (cp[0] & 0xFF);
676            add_assoc_stringl(*subarray, "flags", (char*)++cp, n, 1);
677            cp += n;
678            n = (cp[0] & 0xFF);
679            add_assoc_stringl(*subarray, "services", (char*)++cp, n, 1);
680            cp += n;
681            n = (cp[0] & 0xFF);
682            add_assoc_stringl(*subarray, "regex", (char*)++cp, n, 1);
683            cp += n;
684            n = dn_expand(answer->qb2, answer->qb2+65536, cp, name, (sizeof name) - 2);
685            if (n < 0) {
686                return NULL;
687            }
688            cp += n;
689            add_assoc_string(*subarray, "replacement", name, 1);
690            break;
691        default:
692            cp += dlen;
693    }
694
695    add_assoc_string(*subarray, "class", "IN", 1);
696    add_assoc_long(*subarray, "ttl", ttl);
697
698    return cp;
699}
700/* }}} */
701
702/* {{{ proto array|false dns_get_record(string hostname [, int type[, array authns, array addtl]])
703   Get any Resource Record corresponding to a given Internet host name */
704PHP_FUNCTION(dns_get_record)
705{
706    char *hostname;
707    int hostname_len;
708    long type_param = PHP_DNS_ANY;
709    zval *authns = NULL, *addtl = NULL;
710    int type_to_fetch;
711#if defined(HAVE_DNS_SEARCH)
712    struct sockaddr_storage from;
713    uint32_t fromsize = sizeof(from);
714    dns_handle_t handle;
715#elif defined(HAVE_RES_NSEARCH)
716    struct __res_state state;
717    struct __res_state *handle = &state;
718#endif
719    HEADER *hp;
720    querybuf answer;
721    u_char *cp = NULL, *end = NULL;
722    int n, qd, an, ns = 0, ar = 0;
723    int type, first_query = 1, store_results = 1;
724
725    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|lzz", &hostname, &hostname_len, &type_param, &authns, &addtl) == FAILURE) {
726        return;
727    }
728
729    if (authns) {
730        zval_dtor(authns);
731        array_init(authns);
732    }
733    if (addtl) {
734        zval_dtor(addtl);
735        array_init(addtl);
736    }
737
738    if (type_param & ~PHP_DNS_ALL && type_param != PHP_DNS_ANY) {
739        php_error_docref(NULL TSRMLS_CC, E_WARNING, "Type '%ld' not supported", type_param);
740        RETURN_FALSE;
741    }
742
743    /* Initialize the return array */
744    array_init(return_value);
745
746    /* - We emulate an or'ed type mask by querying type by type. (Steps 0 - NUMTYPES-1 )
747     *   If additional info is wanted we check again with DNS_T_ANY (step NUMTYPES / NUMTYPES+1 )
748     *   store_results is used to skip storing the results retrieved in step
749     *   NUMTYPES+1 when results were already fetched.
750     * - In case of PHP_DNS_ANY we use the directly fetch DNS_T_ANY. (step NUMTYPES+1 )
751     */
752    for (type = (type_param == PHP_DNS_ANY ? (PHP_DNS_NUM_TYPES + 1) : 0);
753        type < (addtl ? (PHP_DNS_NUM_TYPES + 2) : PHP_DNS_NUM_TYPES) || first_query;
754        type++
755    ) {
756        first_query = 0;
757        switch (type) {
758            case 0:
759                type_to_fetch = type_param&PHP_DNS_A     ? DNS_T_A     : 0;
760                break;
761            case 1:
762                type_to_fetch = type_param&PHP_DNS_NS    ? DNS_T_NS    : 0;
763                break;
764            case 2:
765                type_to_fetch = type_param&PHP_DNS_CNAME ? DNS_T_CNAME : 0;
766                break;
767            case 3:
768                type_to_fetch = type_param&PHP_DNS_SOA   ? DNS_T_SOA   : 0;
769                break;
770            case 4:
771                type_to_fetch = type_param&PHP_DNS_PTR   ? DNS_T_PTR   : 0;
772                break;
773            case 5:
774                type_to_fetch = type_param&PHP_DNS_HINFO ? DNS_T_HINFO : 0;
775                break;
776            case 6:
777                type_to_fetch = type_param&PHP_DNS_MX    ? DNS_T_MX    : 0;
778                break;
779            case 7:
780                type_to_fetch = type_param&PHP_DNS_TXT   ? DNS_T_TXT   : 0;
781                break;
782            case 8:
783                type_to_fetch = type_param&PHP_DNS_AAAA  ? DNS_T_AAAA  : 0;
784                break;
785            case 9:
786                type_to_fetch = type_param&PHP_DNS_SRV   ? DNS_T_SRV   : 0;
787                break;
788            case 10:
789                type_to_fetch = type_param&PHP_DNS_NAPTR ? DNS_T_NAPTR : 0;
790                break;
791            case 11:
792                type_to_fetch = type_param&PHP_DNS_A6    ? DNS_T_A6 : 0;
793                break;
794            case PHP_DNS_NUM_TYPES:
795                store_results = 0;
796                continue;
797            default:
798            case (PHP_DNS_NUM_TYPES + 1):
799                type_to_fetch = DNS_T_ANY;
800                break;
801        }
802
803        if (type_to_fetch) {
804#if defined(HAVE_DNS_SEARCH)
805            handle = dns_open(NULL);
806            if (handle == NULL) {
807                zval_dtor(return_value);
808                RETURN_FALSE;
809            }
810#elif defined(HAVE_RES_NSEARCH)
811            memset(&state, 0, sizeof(state));
812            if (res_ninit(handle)) {
813                zval_dtor(return_value);
814                RETURN_FALSE;
815            }
816#else
817            res_init();
818#endif
819
820            n = php_dns_search(handle, hostname, C_IN, type_to_fetch, answer.qb2, sizeof answer);
821
822            if (n < 0) {
823                php_dns_free_handle(handle);
824                continue;
825            }
826
827            cp = answer.qb2 + HFIXEDSZ;
828            end = answer.qb2 + n;
829            hp = (HEADER *)&answer;
830            qd = ntohs(hp->qdcount);
831            an = ntohs(hp->ancount);
832            ns = ntohs(hp->nscount);
833            ar = ntohs(hp->arcount);
834
835            /* Skip QD entries, they're only used by dn_expand later on */
836            while (qd-- > 0) {
837                n = dn_skipname(cp, end);
838                if (n < 0) {
839                    php_error_docref(NULL TSRMLS_CC, E_WARNING, "Unable to parse DNS data received");
840                    zval_dtor(return_value);
841                    php_dns_free_handle(handle);
842                    RETURN_FALSE;
843                }
844                cp += n + QFIXEDSZ;
845            }
846
847            /* YAY! Our real answers! */
848            while (an-- && cp && cp < end) {
849                zval *retval;
850
851                cp = php_parserr(cp, &answer, type_to_fetch, store_results, &retval);
852                if (retval != NULL && store_results) {
853                    add_next_index_zval(return_value, retval);
854                }
855            }
856
857            if (authns || addtl) {
858                /* List of Authoritative Name Servers
859                 * Process when only requesting addtl so that we can skip through the section
860                 */
861                while (ns-- > 0 && cp && cp < end) {
862                    zval *retval = NULL;
863
864                    cp = php_parserr(cp, &answer, DNS_T_ANY, authns != NULL, &retval);
865                    if (retval != NULL) {
866                        add_next_index_zval(authns, retval);
867                    }
868                }
869            }
870
871            if (addtl) {
872                /* Additional records associated with authoritative name servers */
873                while (ar-- > 0 && cp && cp < end) {
874                    zval *retval = NULL;
875
876                    cp = php_parserr(cp, &answer, DNS_T_ANY, 1, &retval);
877                    if (retval != NULL) {
878                        add_next_index_zval(addtl, retval);
879                    }
880                }
881            }
882            php_dns_free_handle(handle);
883        }
884    }
885}
886/* }}} */
887
888/* {{{ proto bool dns_get_mx(string hostname, array mxhosts [, array weight])
889   Get MX records corresponding to a given Internet host name */
890PHP_FUNCTION(dns_get_mx)
891{
892    char *hostname;
893    int hostname_len;
894    zval *mx_list, *weight_list = NULL;
895    int count, qdc;
896    u_short type, weight;
897    u_char ans[MAXPACKET];
898    char buf[MAXHOSTNAMELEN];
899    HEADER *hp;
900    u_char *cp, *end;
901    int i;
902#if defined(HAVE_DNS_SEARCH)
903    struct sockaddr_storage from;
904    uint32_t fromsize = sizeof(from);
905    dns_handle_t handle;
906#elif defined(HAVE_RES_NSEARCH)
907    struct __res_state state;
908    struct __res_state *handle = &state;
909#endif
910
911    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "sz|z", &hostname, &hostname_len, &mx_list, &weight_list) == FAILURE) {
912        return;
913    }
914
915    zval_dtor(mx_list);
916    array_init(mx_list);
917
918    if (weight_list) {
919        zval_dtor(weight_list);
920        array_init(weight_list);
921    }
922
923#if defined(HAVE_DNS_SEARCH)
924    handle = dns_open(NULL);
925    if (handle == NULL) {
926        RETURN_FALSE;
927    }
928#elif defined(HAVE_RES_NSEARCH)
929    memset(&state, 0, sizeof(state));
930    if (res_ninit(handle)) {
931            RETURN_FALSE;
932    }
933#else
934    res_init();
935#endif
936
937    i = php_dns_search(handle, hostname, C_IN, DNS_T_MX, (u_char *)&ans, sizeof(ans));
938    if (i < 0) {
939        RETURN_FALSE;
940    }
941    if (i > (int)sizeof(ans)) {
942        i = sizeof(ans);
943    }
944    hp = (HEADER *)&ans;
945    cp = (u_char *)&ans + HFIXEDSZ;
946    end = (u_char *)&ans +i;
947    for (qdc = ntohs((unsigned short)hp->qdcount); qdc--; cp += i + QFIXEDSZ) {
948        if ((i = dn_skipname(cp, end)) < 0 ) {
949            php_dns_free_handle(handle);
950            RETURN_FALSE;
951        }
952    }
953    count = ntohs((unsigned short)hp->ancount);
954    while (--count >= 0 && cp < end) {
955        if ((i = dn_skipname(cp, end)) < 0 ) {
956            php_dns_free_handle(handle);
957            RETURN_FALSE;
958        }
959        cp += i;
960        GETSHORT(type, cp);
961        cp += INT16SZ + INT32SZ;
962        GETSHORT(i, cp);
963        if (type != DNS_T_MX) {
964            cp += i;
965            continue;
966        }
967        GETSHORT(weight, cp);
968        if ((i = dn_expand(ans, end, cp, buf, sizeof(buf)-1)) < 0) {
969            php_dns_free_handle(handle);
970            RETURN_FALSE;
971        }
972        cp += i;
973        add_next_index_string(mx_list, buf, 1);
974        if (weight_list) {
975            add_next_index_long(weight_list, weight);
976        }
977    }
978    php_dns_free_handle(handle);
979    RETURN_TRUE;
980}
981/* }}} */
982#endif /* HAVE_FULL_DNS_FUNCS */
983#endif /* !defined(PHP_WIN32) && (HAVE_DNS_SEARCH_FUNC && !(defined(__BEOS__) || defined(NETWARE))) */
984
985#if HAVE_FULL_DNS_FUNCS || defined(PHP_WIN32)
986PHP_MINIT_FUNCTION(dns) {
987    REGISTER_LONG_CONSTANT("DNS_A",     PHP_DNS_A,     CONST_CS | CONST_PERSISTENT);
988    REGISTER_LONG_CONSTANT("DNS_NS",    PHP_DNS_NS,    CONST_CS | CONST_PERSISTENT);
989    REGISTER_LONG_CONSTANT("DNS_CNAME", PHP_DNS_CNAME, CONST_CS | CONST_PERSISTENT);
990    REGISTER_LONG_CONSTANT("DNS_SOA",   PHP_DNS_SOA,   CONST_CS | CONST_PERSISTENT);
991    REGISTER_LONG_CONSTANT("DNS_PTR",   PHP_DNS_PTR,   CONST_CS | CONST_PERSISTENT);
992    REGISTER_LONG_CONSTANT("DNS_HINFO", PHP_DNS_HINFO, CONST_CS | CONST_PERSISTENT);
993    REGISTER_LONG_CONSTANT("DNS_MX",    PHP_DNS_MX,    CONST_CS | CONST_PERSISTENT);
994    REGISTER_LONG_CONSTANT("DNS_TXT",   PHP_DNS_TXT,   CONST_CS | CONST_PERSISTENT);
995    REGISTER_LONG_CONSTANT("DNS_SRV",   PHP_DNS_SRV,   CONST_CS | CONST_PERSISTENT);
996    REGISTER_LONG_CONSTANT("DNS_NAPTR", PHP_DNS_NAPTR, CONST_CS | CONST_PERSISTENT);
997    REGISTER_LONG_CONSTANT("DNS_AAAA",  PHP_DNS_AAAA,  CONST_CS | CONST_PERSISTENT);
998    REGISTER_LONG_CONSTANT("DNS_A6",    PHP_DNS_A6,    CONST_CS | CONST_PERSISTENT);
999    REGISTER_LONG_CONSTANT("DNS_ANY",   PHP_DNS_ANY,   CONST_CS | CONST_PERSISTENT);
1000    REGISTER_LONG_CONSTANT("DNS_ALL",   PHP_DNS_ALL,   CONST_CS | CONST_PERSISTENT);
1001    return SUCCESS;
1002}
1003#endif /* HAVE_FULL_DNS_FUNCS */
1004
1005/*
1006 * Local variables:
1007 * tab-width: 4
1008 * c-basic-offset: 4
1009 * End:
1010 * vim600: sw=4 ts=4 fdm=marker
1011 * vim<600: sw=4 ts=4
1012 */
1013