michael@0: /*	$NetBSD: res_data.c,v 1.8 2004/06/09 18:07:03 christos Exp $	*/
michael@0: 
michael@0: /*
michael@0:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
michael@0:  * Copyright (c) 1995-1999 by Internet Software Consortium.
michael@0:  *
michael@0:  * Permission to use, copy, modify, and distribute this software for any
michael@0:  * purpose with or without fee is hereby granted, provided that the above
michael@0:  * copyright notice and this permission notice appear in all copies.
michael@0:  *
michael@0:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
michael@0:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
michael@0:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
michael@0:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
michael@0:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
michael@0:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
michael@0:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * This version of this file is derived from Android 2.3 "Gingerbread",
michael@0:  * which contains uncredited changes by Android/Google developers.  It has
michael@0:  * been modified in 2011 for use in the Android build of Mozilla Firefox by
michael@0:  * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
michael@0:  * and Steve Workman <sjhworkman@gmail.com>).
michael@0:  * These changes are offered under the same license as the original NetBSD
michael@0:  * file, whose copyright and license are unchanged above.
michael@0:  */
michael@0: 
michael@0: #define ANDROID_CHANGES 1
michael@0: #define MOZILLA_NECKO_EXCLUDE_CODE 1
michael@0: 
michael@0: #include <sys/cdefs.h>
michael@0: #if defined(LIBC_SCCS) && !defined(lint)
michael@0: #ifdef notdef
michael@0: static const char rcsid[] = "Id: res_data.c,v 1.1.206.2 2004/03/16 12:34:18 marka Exp";
michael@0: #else
michael@0: __RCSID("$NetBSD: res_data.c,v 1.8 2004/06/09 18:07:03 christos Exp $");
michael@0: #endif
michael@0: #endif /* LIBC_SCCS and not lint */
michael@0: 
michael@0: 
michael@0: 
michael@0: #include <sys/types.h>
michael@0: #include <sys/param.h>
michael@0: #include <sys/socket.h>
michael@0: #include <sys/time.h>
michael@0: 
michael@0: #include <netinet/in.h>
michael@0: #include <arpa/inet.h>
michael@0: #include "arpa_nameser.h"
michael@0: 
michael@0: #include <ctype.h>
michael@0: #include <netdb.h>
michael@0: #include "resolv_private.h"
michael@0: #include <stdio.h>
michael@0: #include <stdlib.h>
michael@0: #include <string.h>
michael@0: #include <unistd.h>
michael@0: 
michael@0: 
michael@0: const char * const _res_opcodes[] = {
michael@0: 	"QUERY",
michael@0: 	"IQUERY",
michael@0: 	"CQUERYM",
michael@0: 	"CQUERYU",	/* experimental */
michael@0: 	"NOTIFY",	/* experimental */
michael@0: 	"UPDATE",
michael@0: 	"6",
michael@0: 	"7",
michael@0: 	"8",
michael@0: 	"9",
michael@0: 	"10",
michael@0: 	"11",
michael@0: 	"12",
michael@0: 	"13",
michael@0: 	"ZONEINIT",
michael@0: 	"ZONEREF",
michael@0: };
michael@0: 
michael@0: #ifdef BIND_UPDATE
michael@0: const char * const _res_sectioncodes[] = {
michael@0: 	"ZONE",
michael@0: 	"PREREQUISITES",
michael@0: 	"UPDATE",
michael@0: 	"ADDITIONAL",
michael@0: };
michael@0: #endif
michael@0: 
michael@0: #ifndef MOZILLA_NECKO_EXCLUDE_CODE
michael@0: #ifndef __BIND_NOSTATIC
michael@0: extern struct __res_state _nres;
michael@0: 
michael@0: /* Proto. */
michael@0: 
michael@0: int  res_ourserver_p(const res_state, const struct sockaddr *);
michael@0: 
michael@0: #ifdef ANDROID_CHANGES
michael@0: int res_need_init() {
michael@0: 	return ((_nres.options & RES_INIT) == 0U) || res_get_dns_changed();
michael@0: }
michael@0: #else
michael@0: #define res_need_init()   ((_nres.options & RES_INIT) == 0U)
michael@0: #endif
michael@0: 
michael@0: int
michael@0: res_init(void) {
michael@0: 	int rv;
michael@0: 	extern int __res_vinit(res_state, int);
michael@0: #ifdef COMPAT__RES
michael@0: 	/*
michael@0: 	 * Compatibility with program that were accessing _res directly
michael@0: 	 * to set options. We keep another struct res that is the same
michael@0: 	 * size as the original res structure, and then copy fields to
michael@0: 	 * it so that we achieve the same initialization
michael@0: 	 */
michael@0: 	extern void *__res_get_old_state(void);
michael@0: 	extern void __res_put_old_state(void *);
michael@0: 	res_state ores = __res_get_old_state();
michael@0: 
michael@0: 	if (ores->options != 0)
michael@0: 		_nres.options = ores->options;
michael@0: 	if (ores->retrans != 0)
michael@0: 		_nres.retrans = ores->retrans;
michael@0: 	if (ores->retry != 0)
michael@0: 		_nres.retry = ores->retry;
michael@0: #endif
michael@0: 
michael@0: 	/*
michael@0: 	 * These three fields used to be statically initialized.  This made
michael@0: 	 * it hard to use this code in a shared library.  It is necessary,
michael@0: 	 * now that we're doing dynamic initialization here, that we preserve
michael@0: 	 * the old semantics: if an application modifies one of these three
michael@0: 	 * fields of _res before res_init() is called, res_init() will not
michael@0: 	 * alter them.  Of course, if an application is setting them to
michael@0: 	 * _zero_ before calling res_init(), hoping to override what used
michael@0: 	 * to be the static default, we can't detect it and unexpected results
michael@0: 	 * will follow.  Zero for any of these fields would make no sense,
michael@0: 	 * so one can safely assume that the applications were already getting
michael@0: 	 * unexpected results.
michael@0: 	 *
michael@0: 	 * _nres.options is tricky since some apps were known to diddle the bits
michael@0: 	 * before res_init() was first called. We can't replicate that semantic
michael@0: 	 * with dynamic initialization (they may have turned bits off that are
michael@0: 	 * set in RES_DEFAULT).  Our solution is to declare such applications
michael@0: 	 * "broken".  They could fool us by setting RES_INIT but none do (yet).
michael@0: 	 */
michael@0: 	if (!_nres.retrans)
michael@0: 		_nres.retrans = RES_TIMEOUT;
michael@0: 	if (!_nres.retry)
michael@0: 		_nres.retry = 4;
michael@0: 	if (!(_nres.options & RES_INIT))
michael@0: 		_nres.options = RES_DEFAULT;
michael@0: 
michael@0: 	/*
michael@0: 	 * This one used to initialize implicitly to zero, so unless the app
michael@0: 	 * has set it to something in particular, we can randomize it now.
michael@0: 	 */
michael@0: 	if (!_nres.id)
michael@0: 		_nres.id = res_randomid();
michael@0: 
michael@0: 	rv = __res_vinit(&_nres, 1);
michael@0: #ifdef COMPAT__RES
michael@0: 	__res_put_old_state(&_nres);
michael@0: #endif
michael@0: 	return rv;
michael@0: }
michael@0: 
michael@0: void
michael@0: p_query(const u_char *msg) {
michael@0: 	fp_query(msg, stdout);
michael@0: }
michael@0: 
michael@0: void
michael@0: fp_query(const u_char *msg, FILE *file) {
michael@0: 	fp_nquery(msg, PACKETSZ, file);
michael@0: }
michael@0: 
michael@0: void
michael@0: fp_nquery(const u_char *msg, int len, FILE *file) {
michael@0: 	if (res_need_init() && res_init() == -1)
michael@0: 		return;
michael@0: 
michael@0: 	res_pquery(&_nres, msg, len, file);
michael@0: }
michael@0: 
michael@0: int
michael@0: res_mkquery(int op,			/* opcode of query */
michael@0: 	    const char *dname,		/* domain name */
michael@0: 	    int class, int type,	/* class and type of query */
michael@0: 	    const u_char *data,		/* resource record data */
michael@0: 	    int datalen,		/* length of data */
michael@0: 	    const u_char *newrr_in,	/* new rr for modify or append */
michael@0: 	    u_char *buf,		/* buffer to put query */
michael@0: 	    int buflen)			/* size of buffer */
michael@0: {
michael@0: 	if (res_need_init() && res_init() == -1) {
michael@0: 		RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
michael@0: 		return (-1);
michael@0: 	}
michael@0: 	return (res_nmkquery(&_nres, op, dname, class, type,
michael@0: 			     data, datalen,
michael@0: 			     newrr_in, buf, buflen));
michael@0: }
michael@0: 
michael@0: #ifdef _LIBRESOLV
michael@0: int
michael@0: res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
michael@0: 	if (res_need_init() && res_init() == -1) {
michael@0: 		RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
michael@0: 		return (-1);
michael@0: 	}
michael@0: 
michael@0: 	return (res_nmkupdate(&_nres, rrecp_in, buf, buflen));
michael@0: }
michael@0: #endif
michael@0: 
michael@0: int
michael@0: res_query(const char *name,	/* domain name */
michael@0: 	  int class, int type,	/* class and type of query */
michael@0: 	  u_char *answer,	/* buffer to put answer */
michael@0: 	  int anslen)		/* size of answer buffer */
michael@0: {
michael@0: 	if (res_need_init() && res_init() == -1) {
michael@0: 		RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
michael@0: 		return (-1);
michael@0: 	}
michael@0: 	return (res_nquery(&_nres, name, class, type, answer, anslen));
michael@0: }
michael@0: 
michael@0: void
michael@0: res_send_setqhook(res_send_qhook hook) {
michael@0: 	_nres.qhook = hook;
michael@0: }
michael@0: 
michael@0: void
michael@0: res_send_setrhook(res_send_rhook hook) {
michael@0: 	_nres.rhook = hook;
michael@0: }
michael@0: 
michael@0: int
michael@0: res_isourserver(const struct sockaddr_in *inp) {
michael@0: 	return (res_ourserver_p(&_nres, (const struct sockaddr *)(const void *)inp));
michael@0: }
michael@0: 
michael@0: int
michael@0: res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
michael@0: 	if (res_need_init() && res_init() == -1) {
michael@0: 		/* errno should have been set by res_init() in this case. */
michael@0: 		return (-1);
michael@0: 	}
michael@0: 
michael@0: 	return (res_nsend(&_nres, buf, buflen, ans, anssiz));
michael@0: }
michael@0: 
michael@0: #ifdef _LIBRESOLV
michael@0: int
michael@0: res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
michael@0: 	       u_char *ans, int anssiz)
michael@0: {
michael@0: 	if (res_need_init() && res_init() == -1) {
michael@0: 		/* errno should have been set by res_init() in this case. */
michael@0: 		return (-1);
michael@0: 	}
michael@0: 
michael@0: 	return (res_nsendsigned(&_nres, buf, buflen, key, ans, anssiz));
michael@0: }
michael@0: #endif
michael@0: 
michael@0: void
michael@0: res_close(void) {
michael@0: 	res_nclose(&_nres);
michael@0: }
michael@0: 
michael@0: #ifdef _LIBRESOLV
michael@0: int
michael@0: res_update(ns_updrec *rrecp_in) {
michael@0: 	if (res_need_init() && res_init() == -1) {
michael@0: 		RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
michael@0: 		return (-1);
michael@0: 	}
michael@0: 
michael@0: 	return (res_nupdate(&_nres, rrecp_in, NULL));
michael@0: }
michael@0: #endif
michael@0: 
michael@0: int
michael@0: res_search(const char *name,	/* domain name */
michael@0: 	   int class, int type,	/* class and type of query */
michael@0: 	   u_char *answer,	/* buffer to put answer */
michael@0: 	   int anslen)		/* size of answer */
michael@0: {
michael@0: 	if (res_need_init() && res_init() == -1) {
michael@0: 		RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
michael@0: 		return (-1);
michael@0: 	}
michael@0: 
michael@0: 	return (res_nsearch(&_nres, name, class, type, answer, anslen));
michael@0: }
michael@0: 
michael@0: int
michael@0: res_querydomain(const char *name,
michael@0: 		const char *domain,
michael@0: 		int class, int type,	/* class and type of query */
michael@0: 		u_char *answer,		/* buffer to put answer */
michael@0: 		int anslen)		/* size of answer */
michael@0: {
michael@0: 	if (res_need_init() && res_init() == -1) {
michael@0: 		RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
michael@0: 		return (-1);
michael@0: 	}
michael@0: 
michael@0: 	return (res_nquerydomain(&_nres, name, domain,
michael@0: 				 class, type,
michael@0: 				 answer, anslen));
michael@0: }
michael@0: 
michael@0: int
michael@0: res_opt(int a, u_char *b, int c, int d)
michael@0: {
michael@0: 	return res_nopt(&_nres, a, b, c, d);
michael@0: }
michael@0: #endif
michael@0: #endif
michael@0: 
michael@0: const char *
michael@0: hostalias(const char *name) {
michael@0: 	return NULL;
michael@0: }
michael@0: 
michael@0: #ifndef MOZILLA_NECKO_EXCLUDE_CODE
michael@0: #ifdef ultrix
michael@0: int
michael@0: local_hostname_length(const char *hostname) {
michael@0: 	int len_host, len_domain;
michael@0: 
michael@0: 	if (!*_nres.defdname)
michael@0: 		res_init();
michael@0: 	len_host = strlen(hostname);
michael@0: 	len_domain = strlen(_nres.defdname);
michael@0: 	if (len_host > len_domain &&
michael@0: 	    !strcasecmp(hostname + len_host - len_domain, _nres.defdname) &&
michael@0: 	    hostname[len_host - len_domain - 1] == '.')
michael@0: 		return (len_host - len_domain - 1);
michael@0: 	return (0);
michael@0: }
michael@0: #endif /*ultrix*/
michael@0: #endif