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other-licenses/android/ns_parse.c@7e26c7da4463 (annotated)

other-licenses/android/ns_parse.c

Wed, 31 Dec 2014 06:55:50 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Wed, 31 Dec 2014 06:55:50 +0100
changeset 2
7e26c7da4463
permissions
-rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

michael@0 1 /* $NetBSD: ns_parse.c,v 1.2 2004/05/20 20:35:05 christos Exp $ */
michael@0 2
michael@0 3 /*
michael@0 4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
michael@0 5 * Copyright (c) 1996,1999 by Internet Software Consortium.
michael@0 6 *
michael@0 7 * Permission to use, copy, modify, and distribute this software for any
michael@0 8 * purpose with or without fee is hereby granted, provided that the above
michael@0 9 * copyright notice and this permission notice appear in all copies.
michael@0 10 *
michael@0 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
michael@0 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
michael@0 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
michael@0 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
michael@0 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
michael@0 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
michael@0 17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
michael@0 18 */
michael@0 19
michael@0 20 /*
michael@0 21 * This version of this file is derived from Android 2.3 "Gingerbread",
michael@0 22 * which contains uncredited changes by Android/Google developers. It has
michael@0 23 * been modified in 2011 for use in the Android build of Mozilla Firefox by
michael@0 24 * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
michael@0 25 * and Steve Workman <sjhworkman@gmail.com>).
michael@0 26 * These changes are offered under the same license as the original NetBSD
michael@0 27 * file, whose copyright and license are unchanged above.
michael@0 28 */
michael@0 29
michael@0 30 #define ANDROID_CHANGES 1
michael@0 31 #define MOZILLA_NECKO_EXCLUDE_CODE 1
michael@0 32
michael@0 33 #include <sys/cdefs.h>
michael@0 34 #ifndef lint
michael@0 35 #ifdef notdef
michael@0 36 static const char rcsid[] = "Id: ns_parse.c,v 1.3.2.1.4.1 2004/03/09 08:33:44 marka Exp";
michael@0 37 #else
michael@0 38 __RCSID("$NetBSD: ns_parse.c,v 1.2 2004/05/20 20:35:05 christos Exp $");
michael@0 39 #endif
michael@0 40 #endif
michael@0 41
michael@0 42 /* Import. */
michael@0 43
michael@0 44 #include <sys/types.h>
michael@0 45
michael@0 46 #include <netinet/in.h>
michael@0 47 #include "arpa_nameser.h"
michael@0 48
michael@0 49 #include <errno.h>
michael@0 50 #ifdef ANDROID_CHANGES
michael@0 51 #include "resolv_private.h"
michael@0 52 #else
michael@0 53 #include <resolv.h>
michael@0 54 #endif
michael@0 55 #include <string.h>
michael@0 56
michael@0 57 /* Forward. */
michael@0 58
michael@0 59 static void setsection(ns_msg *msg, ns_sect sect);
michael@0 60
michael@0 61 /* Macros. */
michael@0 62
michael@0 63 #define RETERR(err) do { errno = (err); return (-1); } while (/*NOTREACHED*//*CONSTCOND*/0)
michael@0 64
michael@0 65 /* Public. */
michael@0 66
michael@0 67 /* These need to be in the same order as the nres.h:ns_flag enum. */
michael@0 68 const struct _ns_flagdata _ns_flagdata[16] = {
michael@0 69 { 0x8000, 15 }, /* qr. */
michael@0 70 { 0x7800, 11 }, /* opcode. */
michael@0 71 { 0x0400, 10 }, /* aa. */
michael@0 72 { 0x0200, 9 }, /* tc. */
michael@0 73 { 0x0100, 8 }, /* rd. */
michael@0 74 { 0x0080, 7 }, /* ra. */
michael@0 75 { 0x0040, 6 }, /* z. */
michael@0 76 { 0x0020, 5 }, /* ad. */
michael@0 77 { 0x0010, 4 }, /* cd. */
michael@0 78 { 0x000f, 0 }, /* rcode. */
michael@0 79 { 0x0000, 0 }, /* expansion (1/6). */
michael@0 80 { 0x0000, 0 }, /* expansion (2/6). */
michael@0 81 { 0x0000, 0 }, /* expansion (3/6). */
michael@0 82 { 0x0000, 0 }, /* expansion (4/6). */
michael@0 83 { 0x0000, 0 }, /* expansion (5/6). */
michael@0 84 { 0x0000, 0 }, /* expansion (6/6). */
michael@0 85 };
michael@0 86
michael@0 87 int ns_msg_getflag(ns_msg handle, int flag) {
michael@0 88 return((u_int32_t)((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift);
michael@0 89 }
michael@0 90
michael@0 91 int
michael@0 92 ns_skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
michael@0 93 const u_char *optr = ptr;
michael@0 94
michael@0 95 for (; count > 0; count--) {
michael@0 96 int b, rdlength;
michael@0 97
michael@0 98 b = dn_skipname(ptr, eom);
michael@0 99 if (b < 0)
michael@0 100 RETERR(EMSGSIZE);
michael@0 101 ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
michael@0 102 if (section != ns_s_qd) {
michael@0 103 if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
michael@0 104 RETERR(EMSGSIZE);
michael@0 105 ptr += NS_INT32SZ/*TTL*/;
michael@0 106 NS_GET16(rdlength, ptr);
michael@0 107 ptr += rdlength/*RData*/;
michael@0 108 }
michael@0 109 }
michael@0 110 if (ptr > eom)
michael@0 111 RETERR(EMSGSIZE);
michael@0 112 return (ptr - optr);
michael@0 113 }
michael@0 114
michael@0 115 int
michael@0 116 ns_initparse(const u_char *msg, int msglen, ns_msg *handle) {
michael@0 117 const u_char *eom = msg + msglen;
michael@0 118 int i;
michael@0 119
michael@0 120 memset(handle, 0x5e, sizeof *handle);
michael@0 121 handle->_msg = msg;
michael@0 122 handle->_eom = eom;
michael@0 123 if (msg + NS_INT16SZ > eom)
michael@0 124 RETERR(EMSGSIZE);
michael@0 125 NS_GET16(handle->_id, msg);
michael@0 126 if (msg + NS_INT16SZ > eom)
michael@0 127 RETERR(EMSGSIZE);
michael@0 128 NS_GET16(handle->_flags, msg);
michael@0 129 for (i = 0; i < ns_s_max; i++) {
michael@0 130 if (msg + NS_INT16SZ > eom)
michael@0 131 RETERR(EMSGSIZE);
michael@0 132 NS_GET16(handle->_counts[i], msg);
michael@0 133 }
michael@0 134 for (i = 0; i < ns_s_max; i++)
michael@0 135 if (handle->_counts[i] == 0)
michael@0 136 handle->_sections[i] = NULL;
michael@0 137 else {
michael@0 138 int b = ns_skiprr(msg, eom, (ns_sect)i,
michael@0 139 handle->_counts[i]);
michael@0 140
michael@0 141 if (b < 0)
michael@0 142 return (-1);
michael@0 143 handle->_sections[i] = msg;
michael@0 144 msg += b;
michael@0 145 }
michael@0 146 if (msg != eom)
michael@0 147 RETERR(EMSGSIZE);
michael@0 148 setsection(handle, ns_s_max);
michael@0 149 return (0);
michael@0 150 }
michael@0 151
michael@0 152 int
michael@0 153 ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) {
michael@0 154 int b;
michael@0 155
michael@0 156 /* Make section right. */
michael@0 157 if ((unsigned)section >= (unsigned)ns_s_max)
michael@0 158 RETERR(ENODEV);
michael@0 159 if (section != handle->_sect)
michael@0 160 setsection(handle, section);
michael@0 161
michael@0 162 /* Make rrnum right. */
michael@0 163 if (rrnum == -1)
michael@0 164 rrnum = handle->_rrnum;
michael@0 165 if (rrnum < 0 || rrnum >= handle->_counts[(int)section])
michael@0 166 RETERR(ENODEV);
michael@0 167 if (rrnum < handle->_rrnum)
michael@0 168 setsection(handle, section);
michael@0 169 if (rrnum > handle->_rrnum) {
michael@0 170 b = ns_skiprr(handle->_msg_ptr, handle->_eom, section,
michael@0 171 rrnum - handle->_rrnum);
michael@0 172
michael@0 173 if (b < 0)
michael@0 174 return (-1);
michael@0 175 handle->_msg_ptr += b;
michael@0 176 handle->_rrnum = rrnum;
michael@0 177 }
michael@0 178
michael@0 179 /* Do the parse. */
michael@0 180 b = dn_expand(handle->_msg, handle->_eom,
michael@0 181 handle->_msg_ptr, rr->name, NS_MAXDNAME);
michael@0 182 if (b < 0)
michael@0 183 return (-1);
michael@0 184 handle->_msg_ptr += b;
michael@0 185 if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom)
michael@0 186 RETERR(EMSGSIZE);
michael@0 187 NS_GET16(rr->type, handle->_msg_ptr);
michael@0 188 NS_GET16(rr->rr_class, handle->_msg_ptr);
michael@0 189 if (section == ns_s_qd) {
michael@0 190 rr->ttl = 0;
michael@0 191 rr->rdlength = 0;
michael@0 192 rr->rdata = NULL;
michael@0 193 } else {
michael@0 194 if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom)
michael@0 195 RETERR(EMSGSIZE);
michael@0 196 NS_GET32(rr->ttl, handle->_msg_ptr);
michael@0 197 NS_GET16(rr->rdlength, handle->_msg_ptr);
michael@0 198 if (handle->_msg_ptr + rr->rdlength > handle->_eom)
michael@0 199 RETERR(EMSGSIZE);
michael@0 200 rr->rdata = handle->_msg_ptr;
michael@0 201 handle->_msg_ptr += rr->rdlength;
michael@0 202 }
michael@0 203 if (++handle->_rrnum > handle->_counts[(int)section])
michael@0 204 setsection(handle, (ns_sect)((int)section + 1));
michael@0 205
michael@0 206 /* All done. */
michael@0 207 return (0);
michael@0 208 }
michael@0 209
michael@0 210 /* Private. */
michael@0 211
michael@0 212 static void
michael@0 213 setsection(ns_msg *msg, ns_sect sect) {
michael@0 214 msg->_sect = sect;
michael@0 215 if (sect == ns_s_max) {
michael@0 216 msg->_rrnum = -1;
michael@0 217 msg->_msg_ptr = NULL;
michael@0 218 } else {
michael@0 219 msg->_rrnum = 0;
michael@0 220 msg->_msg_ptr = msg->_sections[(int)sect];
michael@0 221 }
michael@0 222 }

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