The Tor Browser / file comparison
comparison: other-licenses/android/ns_parse.c
other-licenses/android/ns_parse.c
- branch
- TOR_BUG_9701
- changeset 14
- 925c144e1f1f
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| -1:000000000000 | 0:9a0edce12e14 |
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| 1 /* $NetBSD: ns_parse.c,v 1.2 2004/05/20 20:35:05 christos Exp $ */ | |
| 2 | |
| 3 /* | |
| 4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") | |
| 5 * Copyright (c) 1996,1999 by Internet Software Consortium. | |
| 6 * | |
| 7 * Permission to use, copy, modify, and distribute this software for any | |
| 8 * purpose with or without fee is hereby granted, provided that the above | |
| 9 * copyright notice and this permission notice appear in all copies. | |
| 10 * | |
| 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES | |
| 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
| 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR | |
| 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
| 17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 18 */ | |
| 19 | |
| 20 /* | |
| 21 * This version of this file is derived from Android 2.3 "Gingerbread", | |
| 22 * which contains uncredited changes by Android/Google developers. It has | |
| 23 * been modified in 2011 for use in the Android build of Mozilla Firefox by | |
| 24 * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>, | |
| 25 * and Steve Workman <sjhworkman@gmail.com>). | |
| 26 * These changes are offered under the same license as the original NetBSD | |
| 27 * file, whose copyright and license are unchanged above. | |
| 28 */ | |
| 29 | |
| 30 #define ANDROID_CHANGES 1 | |
| 31 #define MOZILLA_NECKO_EXCLUDE_CODE 1 | |
| 32 | |
| 33 #include <sys/cdefs.h> | |
| 34 #ifndef lint | |
| 35 #ifdef notdef | |
| 36 static const char rcsid[] = "Id: ns_parse.c,v 1.3.2.1.4.1 2004/03/09 08:33:44 marka Exp"; | |
| 37 #else | |
| 38 __RCSID("$NetBSD: ns_parse.c,v 1.2 2004/05/20 20:35:05 christos Exp $"); | |
| 39 #endif | |
| 40 #endif | |
| 41 | |
| 42 /* Import. */ | |
| 43 | |
| 44 #include <sys/types.h> | |
| 45 | |
| 46 #include <netinet/in.h> | |
| 47 #include "arpa_nameser.h" | |
| 48 | |
| 49 #include <errno.h> | |
| 50 #ifdef ANDROID_CHANGES | |
| 51 #include "resolv_private.h" | |
| 52 #else | |
| 53 #include <resolv.h> | |
| 54 #endif | |
| 55 #include <string.h> | |
| 56 | |
| 57 /* Forward. */ | |
| 58 | |
| 59 static void setsection(ns_msg *msg, ns_sect sect); | |
| 60 | |
| 61 /* Macros. */ | |
| 62 | |
| 63 #define RETERR(err) do { errno = (err); return (-1); } while (/*NOTREACHED*//*CONSTCOND*/0) | |
| 64 | |
| 65 /* Public. */ | |
| 66 | |
| 67 /* These need to be in the same order as the nres.h:ns_flag enum. */ | |
| 68 const struct _ns_flagdata _ns_flagdata[16] = { | |
| 69 { 0x8000, 15 }, /* qr. */ | |
| 70 { 0x7800, 11 }, /* opcode. */ | |
| 71 { 0x0400, 10 }, /* aa. */ | |
| 72 { 0x0200, 9 }, /* tc. */ | |
| 73 { 0x0100, 8 }, /* rd. */ | |
| 74 { 0x0080, 7 }, /* ra. */ | |
| 75 { 0x0040, 6 }, /* z. */ | |
| 76 { 0x0020, 5 }, /* ad. */ | |
| 77 { 0x0010, 4 }, /* cd. */ | |
| 78 { 0x000f, 0 }, /* rcode. */ | |
| 79 { 0x0000, 0 }, /* expansion (1/6). */ | |
| 80 { 0x0000, 0 }, /* expansion (2/6). */ | |
| 81 { 0x0000, 0 }, /* expansion (3/6). */ | |
| 82 { 0x0000, 0 }, /* expansion (4/6). */ | |
| 83 { 0x0000, 0 }, /* expansion (5/6). */ | |
| 84 { 0x0000, 0 }, /* expansion (6/6). */ | |
| 85 }; | |
| 86 | |
| 87 int ns_msg_getflag(ns_msg handle, int flag) { | |
| 88 return((u_int32_t)((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift); | |
| 89 } | |
| 90 | |
| 91 int | |
| 92 ns_skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) { | |
| 93 const u_char *optr = ptr; | |
| 94 | |
| 95 for (; count > 0; count--) { | |
| 96 int b, rdlength; | |
| 97 | |
| 98 b = dn_skipname(ptr, eom); | |
| 99 if (b < 0) | |
| 100 RETERR(EMSGSIZE); | |
| 101 ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/; | |
| 102 if (section != ns_s_qd) { | |
| 103 if (ptr + NS_INT32SZ + NS_INT16SZ > eom) | |
| 104 RETERR(EMSGSIZE); | |
| 105 ptr += NS_INT32SZ/*TTL*/; | |
| 106 NS_GET16(rdlength, ptr); | |
| 107 ptr += rdlength/*RData*/; | |
| 108 } | |
| 109 } | |
| 110 if (ptr > eom) | |
| 111 RETERR(EMSGSIZE); | |
| 112 return (ptr - optr); | |
| 113 } | |
| 114 | |
| 115 int | |
| 116 ns_initparse(const u_char *msg, int msglen, ns_msg *handle) { | |
| 117 const u_char *eom = msg + msglen; | |
| 118 int i; | |
| 119 | |
| 120 memset(handle, 0x5e, sizeof *handle); | |
| 121 handle->_msg = msg; | |
| 122 handle->_eom = eom; | |
| 123 if (msg + NS_INT16SZ > eom) | |
| 124 RETERR(EMSGSIZE); | |
| 125 NS_GET16(handle->_id, msg); | |
| 126 if (msg + NS_INT16SZ > eom) | |
| 127 RETERR(EMSGSIZE); | |
| 128 NS_GET16(handle->_flags, msg); | |
| 129 for (i = 0; i < ns_s_max; i++) { | |
| 130 if (msg + NS_INT16SZ > eom) | |
| 131 RETERR(EMSGSIZE); | |
| 132 NS_GET16(handle->_counts[i], msg); | |
| 133 } | |
| 134 for (i = 0; i < ns_s_max; i++) | |
| 135 if (handle->_counts[i] == 0) | |
| 136 handle->_sections[i] = NULL; | |
| 137 else { | |
| 138 int b = ns_skiprr(msg, eom, (ns_sect)i, | |
| 139 handle->_counts[i]); | |
| 140 | |
| 141 if (b < 0) | |
| 142 return (-1); | |
| 143 handle->_sections[i] = msg; | |
| 144 msg += b; | |
| 145 } | |
| 146 if (msg != eom) | |
| 147 RETERR(EMSGSIZE); | |
| 148 setsection(handle, ns_s_max); | |
| 149 return (0); | |
| 150 } | |
| 151 | |
| 152 int | |
| 153 ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) { | |
| 154 int b; | |
| 155 | |
| 156 /* Make section right. */ | |
| 157 if ((unsigned)section >= (unsigned)ns_s_max) | |
| 158 RETERR(ENODEV); | |
| 159 if (section != handle->_sect) | |
| 160 setsection(handle, section); | |
| 161 | |
| 162 /* Make rrnum right. */ | |
| 163 if (rrnum == -1) | |
| 164 rrnum = handle->_rrnum; | |
| 165 if (rrnum < 0 || rrnum >= handle->_counts[(int)section]) | |
| 166 RETERR(ENODEV); | |
| 167 if (rrnum < handle->_rrnum) | |
| 168 setsection(handle, section); | |
| 169 if (rrnum > handle->_rrnum) { | |
| 170 b = ns_skiprr(handle->_msg_ptr, handle->_eom, section, | |
| 171 rrnum - handle->_rrnum); | |
| 172 | |
| 173 if (b < 0) | |
| 174 return (-1); | |
| 175 handle->_msg_ptr += b; | |
| 176 handle->_rrnum = rrnum; | |
| 177 } | |
| 178 | |
| 179 /* Do the parse. */ | |
| 180 b = dn_expand(handle->_msg, handle->_eom, | |
| 181 handle->_msg_ptr, rr->name, NS_MAXDNAME); | |
| 182 if (b < 0) | |
| 183 return (-1); | |
| 184 handle->_msg_ptr += b; | |
| 185 if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom) | |
| 186 RETERR(EMSGSIZE); | |
| 187 NS_GET16(rr->type, handle->_msg_ptr); | |
| 188 NS_GET16(rr->rr_class, handle->_msg_ptr); | |
| 189 if (section == ns_s_qd) { | |
| 190 rr->ttl = 0; | |
| 191 rr->rdlength = 0; | |
| 192 rr->rdata = NULL; | |
| 193 } else { | |
| 194 if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom) | |
| 195 RETERR(EMSGSIZE); | |
| 196 NS_GET32(rr->ttl, handle->_msg_ptr); | |
| 197 NS_GET16(rr->rdlength, handle->_msg_ptr); | |
| 198 if (handle->_msg_ptr + rr->rdlength > handle->_eom) | |
| 199 RETERR(EMSGSIZE); | |
| 200 rr->rdata = handle->_msg_ptr; | |
| 201 handle->_msg_ptr += rr->rdlength; | |
| 202 } | |
| 203 if (++handle->_rrnum > handle->_counts[(int)section]) | |
| 204 setsection(handle, (ns_sect)((int)section + 1)); | |
| 205 | |
| 206 /* All done. */ | |
| 207 return (0); | |
| 208 } | |
| 209 | |
| 210 /* Private. */ | |
| 211 | |
| 212 static void | |
| 213 setsection(ns_msg *msg, ns_sect sect) { | |
| 214 msg->_sect = sect; | |
| 215 if (sect == ns_s_max) { | |
| 216 msg->_rrnum = -1; | |
| 217 msg->_msg_ptr = NULL; | |
| 218 } else { | |
| 219 msg->_rrnum = 0; | |
| 220 msg->_msg_ptr = msg->_sections[(int)sect]; | |
| 221 } | |
| 222 } |
