The Tor Browser: other-licenses/android/res_data.c@97036ab72558 (annotated)

other-licenses/android/res_data.c@97036ab72558 (annotated)

other-licenses/android/res_data.c

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /*	$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

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other-licenses/android/res_data.c@97036ab72558 (annotated)

other-licenses/android/res_data.c