The Tor Browser / file revision

 /*	$NetBSD: res_data.c,v 1.8 2004/06/09 18:07:03 christos Exp $	*/

 /*

  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")

  * Copyright (c) 1995-1999 by Internet Software Consortium.

  *

  * Permission to use, copy, modify, and distribute this software for any

  * purpose with or without fee is hereby granted, provided that the above

  * copyright notice and this permission notice appear in all copies.

  *

  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES

  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR

  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT

  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

  */

 /*

  * This version of this file is derived from Android 2.3 "Gingerbread",

  * which contains uncredited changes by Android/Google developers.  It has

  * been modified in 2011 for use in the Android build of Mozilla Firefox by

  * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,

  * and Steve Workman <sjhworkman@gmail.com>).

  * These changes are offered under the same license as the original NetBSD

  * file, whose copyright and license are unchanged above.

  */

 #define ANDROID_CHANGES 1

 #define MOZILLA_NECKO_EXCLUDE_CODE 1

 #include <sys/cdefs.h>

 #if defined(LIBC_SCCS) && !defined(lint)

 #ifdef notdef

 static const char rcsid[] = "Id: res_data.c,v 1.1.206.2 2004/03/16 12:34:18 marka Exp";

 #else

 __RCSID("$NetBSD: res_data.c,v 1.8 2004/06/09 18:07:03 christos Exp $");

 #endif

 #endif /* LIBC_SCCS and not lint */

 #include <sys/types.h>

 #include <sys/param.h>

 #include <sys/socket.h>

 #include <sys/time.h>

 #include <netinet/in.h>

 #include <arpa/inet.h>

 #include "arpa_nameser.h"

 #include <ctype.h>

 #include <netdb.h>

 #include "resolv_private.h"

 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

 #include <unistd.h>

 const char * const _res_opcodes[] = {

 	"QUERY",

 	"IQUERY",

 	"CQUERYM",

 	"CQUERYU",	/* experimental */

 	"NOTIFY",	/* experimental */

 	"UPDATE",

 	"6",

 	"7",

 	"8",

 	"9",

 	"10",

 	"11",

 	"12",

 	"13",

 	"ZONEINIT",

 	"ZONEREF",

 };

 #ifdef BIND_UPDATE

 const char * const _res_sectioncodes[] = {

 	"ZONE",

 	"PREREQUISITES",

 	"UPDATE",

 	"ADDITIONAL",

 };

 #endif

 #ifndef MOZILLA_NECKO_EXCLUDE_CODE

 #ifndef __BIND_NOSTATIC

 extern struct __res_state _nres;

 /* Proto. */

 int  res_ourserver_p(const res_state, const struct sockaddr *);

 #ifdef ANDROID_CHANGES

 int res_need_init() {

 	return ((_nres.options & RES_INIT) == 0U) || res_get_dns_changed();

 }

 #else

 #define res_need_init()   ((_nres.options & RES_INIT) == 0U)

 #endif

 int

 res_init(void) {

 	int rv;

 	extern int __res_vinit(res_state, int);

 #ifdef COMPAT__RES

 	/*

 	 * Compatibility with program that were accessing _res directly

 	 * to set options. We keep another struct res that is the same

 	 * size as the original res structure, and then copy fields to

 	 * it so that we achieve the same initialization

 	 */

 	extern void *__res_get_old_state(void);

 	extern void __res_put_old_state(void *);

 	res_state ores = __res_get_old_state();

 	if (ores->options != 0)

 		_nres.options = ores->options;

 	if (ores->retrans != 0)

 		_nres.retrans = ores->retrans;

 	if (ores->retry != 0)

 		_nres.retry = ores->retry;

 #endif

 	/*

 	 * These three fields used to be statically initialized.  This made

 	 * it hard to use this code in a shared library.  It is necessary,

 	 * now that we're doing dynamic initialization here, that we preserve

 	 * the old semantics: if an application modifies one of these three

 	 * fields of _res before res_init() is called, res_init() will not

 	 * alter them.  Of course, if an application is setting them to

 	 * _zero_ before calling res_init(), hoping to override what used

 	 * to be the static default, we can't detect it and unexpected results

 	 * will follow.  Zero for any of these fields would make no sense,

 	 * so one can safely assume that the applications were already getting

 	 * unexpected results.

 	 *

 	 * _nres.options is tricky since some apps were known to diddle the bits

 	 * before res_init() was first called. We can't replicate that semantic

 	 * with dynamic initialization (they may have turned bits off that are

 	 * set in RES_DEFAULT).  Our solution is to declare such applications

 	 * "broken".  They could fool us by setting RES_INIT but none do (yet).

 	 */

 	if (!_nres.retrans)

 		_nres.retrans = RES_TIMEOUT;

 	if (!_nres.retry)

 		_nres.retry = 4;

 	if (!(_nres.options & RES_INIT))

 		_nres.options = RES_DEFAULT;

 	/*

 	 * This one used to initialize implicitly to zero, so unless the app

 	 * has set it to something in particular, we can randomize it now.

 	 */

 	if (!_nres.id)

 		_nres.id = res_randomid();

 	rv = __res_vinit(&_nres, 1);

 #ifdef COMPAT__RES

 	__res_put_old_state(&_nres);

 #endif

 	return rv;

 }

 void

 p_query(const u_char *msg) {

 	fp_query(msg, stdout);

 }

 void

 fp_query(const u_char *msg, FILE *file) {

 	fp_nquery(msg, PACKETSZ, file);

 }

 void

 fp_nquery(const u_char *msg, int len, FILE *file) {

 	if (res_need_init() && res_init() == -1)

 		return;

 	res_pquery(&_nres, msg, len, file);

 }

 int

 res_mkquery(int op,			/* opcode of query */

 	    const char *dname,		/* domain name */

 	    int class, int type,	/* class and type of query */

 	    const u_char *data,		/* resource record data */

 	    int datalen,		/* length of data */

 	    const u_char *newrr_in,	/* new rr for modify or append */

 	    u_char *buf,		/* buffer to put query */

 	    int buflen)			/* size of buffer */

 {

 	if (res_need_init() && res_init() == -1) {

 		RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);

 		return (-1);

 	}

 	return (res_nmkquery(&_nres, op, dname, class, type,

 			     data, datalen,

 			     newrr_in, buf, buflen));

 }

 #ifdef _LIBRESOLV

 int

 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {

 	if (res_need_init() && res_init() == -1) {

 		RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);

 		return (-1);

 	}

 	return (res_nmkupdate(&_nres, rrecp_in, buf, buflen));

 }

 #endif

 int

 res_query(const char *name,	/* domain name */

 	  int class, int type,	/* class and type of query */

 	  u_char *answer,	/* buffer to put answer */

 	  int anslen)		/* size of answer buffer */

 {

 	if (res_need_init() && res_init() == -1) {

 		RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);

 		return (-1);

 	}

 	return (res_nquery(&_nres, name, class, type, answer, anslen));

 }

 void

 res_send_setqhook(res_send_qhook hook) {

 	_nres.qhook = hook;

 }

 void

 res_send_setrhook(res_send_rhook hook) {

 	_nres.rhook = hook;

 }

 int

 res_isourserver(const struct sockaddr_in *inp) {

 	return (res_ourserver_p(&_nres, (const struct sockaddr *)(const void *)inp));

 }

 int

 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {

 	if (res_need_init() && res_init() == -1) {

 		/* errno should have been set by res_init() in this case. */

 		return (-1);

 	}

 	return (res_nsend(&_nres, buf, buflen, ans, anssiz));

 }

 #ifdef _LIBRESOLV

 int

 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,

 	       u_char *ans, int anssiz)

 {

 	if (res_need_init() && res_init() == -1) {

 		/* errno should have been set by res_init() in this case. */

 		return (-1);

 	}

 	return (res_nsendsigned(&_nres, buf, buflen, key, ans, anssiz));

 }

 #endif

 void

 res_close(void) {

 	res_nclose(&_nres);

 }

 #ifdef _LIBRESOLV

 int

 res_update(ns_updrec *rrecp_in) {

 	if (res_need_init() && res_init() == -1) {

 		RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);

 		return (-1);

 	}

 	return (res_nupdate(&_nres, rrecp_in, NULL));

 }

 #endif

 int

 res_search(const char *name,	/* domain name */

 	   int class, int type,	/* class and type of query */

 	   u_char *answer,	/* buffer to put answer */

 	   int anslen)		/* size of answer */

 {

 	if (res_need_init() && res_init() == -1) {

 		RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);

 		return (-1);

 	}

 	return (res_nsearch(&_nres, name, class, type, answer, anslen));

 }

 int

 res_querydomain(const char *name,

 		const char *domain,

 		int class, int type,	/* class and type of query */

 		u_char *answer,		/* buffer to put answer */

 		int anslen)		/* size of answer */

 {

 	if (res_need_init() && res_init() == -1) {

 		RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);

 		return (-1);

 	}

 	return (res_nquerydomain(&_nres, name, domain,

 				 class, type,

 				 answer, anslen));

 }

 int

 res_opt(int a, u_char *b, int c, int d)

 {

 	return res_nopt(&_nres, a, b, c, d);

 }

 #endif

 #endif

 const char *

 hostalias(const char *name) {

 	return NULL;

 }

 #ifndef MOZILLA_NECKO_EXCLUDE_CODE

 #ifdef ultrix

 int

 local_hostname_length(const char *hostname) {

 	int len_host, len_domain;

 	if (!*_nres.defdname)

 		res_init();

 	len_host = strlen(hostname);

 	len_domain = strlen(_nres.defdname);

 	if (len_host > len_domain &&

 	    !strcasecmp(hostname + len_host - len_domain, _nres.defdname) &&

 	    hostname[len_host - len_domain - 1] == '.')

 		return (len_host - len_domain - 1);

 	return (0);

 }

 #endif /*ultrix*/

 #endif