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

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

other-licenses/android/res_mkquery.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_mkquery.c,v 1.6 2006/01/24 17:40:32 christos Exp $	*/
 /*
  * Copyright (c) 2008  Android Open Source Project (query id randomization)
  * Copyright (c) 1985, 1993
  *    The Regents of the University of California.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. All advertising materials mentioning features or use of this software
  *    must display the following acknowledgement:
  * 	This product includes software developed by the University of
  * 	California, Berkeley and its contributors.
  * 4. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 /*
  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  *
  * 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, and that
  * the name of Digital Equipment Corporation not be used in advertising or
  * publicity pertaining to distribution of the document or software without
  * specific, written prior permission.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  * CORPORATION 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.
  */
 /*
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  * Portions Copyright (c) 1996-1999 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 sccsid[] = "@(#)res_mkquery.c	8.1 (Berkeley) 6/4/93";
 static const char rcsid[] = "Id: res_mkquery.c,v 1.1.2.2.4.2 2004/03/16 12:34:18 marka Exp";
 #else
 __RCSID("$NetBSD: res_mkquery.c,v 1.6 2006/01/24 17:40:32 christos Exp $");
 #endif
 #endif /* LIBC_SCCS and not lint */
 #include <sys/types.h>
 #include <sys/param.h>
 #include <netinet/in.h>
 #include "arpa_nameser.h"
 #include <netdb.h>
 #ifdef ANDROID_CHANGES
 #include "resolv_private.h"
 #else
 #include <resolv.h>
 #endif
 #include <stdio.h>
 #include <string.h>
 /* Options.  Leave them on. */
 #ifndef DEBUG
 #define DEBUG
 #endif
 #ifndef lint
 #define UNUSED(a)	(void)&a
 #else
 #define UNUSED(a)	a = a
 #endif
 extern const char *_res_opcodes[];
 /*
  * Form all types of queries.
  * Returns the size of the result or -1.
  */
 int
 res_nmkquery(res_state statp,
 	     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 */
 {
 	register HEADER *hp;
 	register u_char *cp, *ep;
 	register int n;
 	u_char *dnptrs[20], **dpp, **lastdnptr;
 	UNUSED(newrr_in);
 #ifdef DEBUG
 	if (statp->options & RES_DEBUG)
 		printf(";; res_nmkquery(%s, %s, %s, %s)\n",
 		       _res_opcodes[op], dname, p_class(class), p_type(type));
 #endif
 	/*
 	 * Initialize header fields.
 	 */
 	if ((buf == NULL) || (buflen < HFIXEDSZ))
 		return (-1);
 	memset(buf, 0, HFIXEDSZ);
 	hp = (HEADER *)(void *)buf;
 	hp->id = htons(res_randomid());
 	hp->opcode = op;
 	hp->rd = (statp->options & RES_RECURSE) != 0U;
 	hp->rcode = NOERROR;
 	cp = buf + HFIXEDSZ;
 	ep = buf + buflen;
 	dpp = dnptrs;
 	*dpp++ = buf;
 	*dpp++ = NULL;
 	lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
 	/*
 	 * perform opcode specific processing
 	 */
 	switch (op) {
 	case QUERY:	/*FALLTHROUGH*/
 	case NS_NOTIFY_OP:
 		if (ep - cp < QFIXEDSZ)
 			return (-1);
 		if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs,
 		    lastdnptr)) < 0)
 			return (-1);
 		cp += n;
 		ns_put16(type, cp);
 		cp += INT16SZ;
 		ns_put16(class, cp);
 		cp += INT16SZ;
 		hp->qdcount = htons(1);
 		if (op == QUERY || data == NULL)
 			break;
 		/*
 		 * Make an additional record for completion domain.
 		 */
 		if ((ep - cp) < RRFIXEDSZ)
 			return (-1);
 		n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ,
 			    dnptrs, lastdnptr);
 		if (n < 0)
 			return (-1);
 		cp += n;
 		ns_put16(T_NULL, cp);
 		cp += INT16SZ;
 		ns_put16(class, cp);
 		cp += INT16SZ;
 		ns_put32(0, cp);
 		cp += INT32SZ;
 		ns_put16(0, cp);
 		cp += INT16SZ;
 		hp->arcount = htons(1);
 		break;
 	case IQUERY:
 		/*
 		 * Initialize answer section
 		 */
 		if (ep - cp < 1 + RRFIXEDSZ + datalen)
 			return (-1);
 		*cp++ = '\0';	/* no domain name */
 		ns_put16(type, cp);
 		cp += INT16SZ;
 		ns_put16(class, cp);
 		cp += INT16SZ;
 		ns_put32(0, cp);
 		cp += INT32SZ;
 		ns_put16(datalen, cp);
 		cp += INT16SZ;
 		if (datalen) {
 			memcpy(cp, data, (size_t)datalen);
 			cp += datalen;
 		}
 		hp->ancount = htons(1);
 		break;
 	default:
 		return (-1);
 	}
 	return (cp - buf);
 }
 #ifdef RES_USE_EDNS0
 /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */
 #ifndef T_OPT
 #define T_OPT	41
 #endif
 int
 res_nopt(res_state statp,
 	 int n0,		/* current offset in buffer */
 	 u_char *buf,		/* buffer to put query */
 	 int buflen,		/* size of buffer */
 	 int anslen)		/* UDP answer buffer size */
 {
 	register HEADER *hp;
 	register u_char *cp, *ep;
 	u_int16_t flags = 0;
 #ifdef DEBUG
 	if ((statp->options & RES_DEBUG) != 0U)
 		printf(";; res_nopt()\n");
 #endif
 	hp = (HEADER *)(void *)buf;
 	cp = buf + n0;
 	ep = buf + buflen;
 	if ((ep - cp) < 1 + RRFIXEDSZ)
 		return (-1);
 	*cp++ = 0;	/* "." */
 	ns_put16(T_OPT, cp);	/* TYPE */
 	cp += INT16SZ;
 	ns_put16(anslen & 0xffff, cp);	/* CLASS = UDP payload size */
 	cp += INT16SZ;
 	*cp++ = NOERROR;	/* extended RCODE */
 	*cp++ = 0;		/* EDNS version */
 	if (statp->options & RES_USE_DNSSEC) {
 #ifdef DEBUG
 		if (statp->options & RES_DEBUG)
 			printf(";; res_opt()... ENDS0 DNSSEC\n");
 #endif
 		flags |= NS_OPT_DNSSEC_OK;
 	}
 	ns_put16(flags, cp);
 	cp += INT16SZ;
 	ns_put16(0, cp);	/* RDLEN */
 	cp += INT16SZ;
 	hp->arcount = htons(ntohs(hp->arcount) + 1);
 	return (cp - buf);
 }
 #endif

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

other-licenses/android/res_mkquery.c