Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 1 | /* $NetBSD: res_init.c,v 1.8 2006/03/19 03:10:08 christos Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1985, 1989, 1993 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. All advertising materials mentioning features or use of this software |
| 16 | * must display the following acknowledgement: |
| 17 | * This product includes software developed by the University of |
| 18 | * California, Berkeley and its contributors. |
| 19 | * 4. Neither the name of the University nor the names of its contributors |
| 20 | * may be used to endorse or promote products derived from this software |
| 21 | * without specific prior written permission. |
| 22 | * |
| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 33 | * SUCH DAMAGE. |
| 34 | */ |
| 35 | |
| 36 | /* |
| 37 | * Portions Copyright (c) 1993 by Digital Equipment Corporation. |
| 38 | * |
| 39 | * Permission to use, copy, modify, and distribute this software for any |
| 40 | * purpose with or without fee is hereby granted, provided that the above |
| 41 | * copyright notice and this permission notice appear in all copies, and that |
| 42 | * the name of Digital Equipment Corporation not be used in advertising or |
| 43 | * publicity pertaining to distribution of the document or software without |
| 44 | * specific, written prior permission. |
| 45 | * |
| 46 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
| 47 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES |
| 48 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT |
| 49 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| 50 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 51 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
| 52 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| 53 | * SOFTWARE. |
| 54 | */ |
| 55 | |
| 56 | /* |
| 57 | * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") |
| 58 | * Portions Copyright (c) 1996-1999 by Internet Software Consortium. |
| 59 | * |
| 60 | * Permission to use, copy, modify, and distribute this software for any |
| 61 | * purpose with or without fee is hereby granted, provided that the above |
| 62 | * copyright notice and this permission notice appear in all copies. |
| 63 | * |
| 64 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
| 65 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 66 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR |
| 67 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 68 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 69 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| 70 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 71 | */ |
Bernie Innocenti | 3952ccc | 2019-03-03 19:39:53 +0900 | [diff] [blame] | 72 | |
Ken Chen | 5471dca | 2019-04-15 15:25:35 +0800 | [diff] [blame] | 73 | #define LOG_TAG "resolv" |
Bernie Innocenti | 3952ccc | 2019-03-03 19:39:53 +0900 | [diff] [blame] | 74 | |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 75 | #include <sys/param.h> |
| 76 | #include <sys/socket.h> |
| 77 | #include <sys/time.h> |
| 78 | |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 79 | #include <arpa/inet.h> |
| 80 | #include <arpa/nameser.h> |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 81 | #include <netinet/in.h> |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 82 | |
chenbruce | acb832c | 2019-02-20 19:45:50 +0800 | [diff] [blame] | 83 | #include <android-base/logging.h> |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 84 | #include <ctype.h> |
Bernie Innocenti | f33a63f | 2018-08-30 12:04:03 +0900 | [diff] [blame] | 85 | #include <errno.h> |
| 86 | #include <fcntl.h> |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 87 | #include <netdb.h> |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 88 | #include <stdlib.h> |
| 89 | #include <string.h> |
| 90 | #include <unistd.h> |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 91 | |
Bernie Innocenti | ac18b12 | 2018-10-01 23:10:18 +0900 | [diff] [blame] | 92 | #include "netd_resolv/resolv.h" |
| 93 | #include "res_state_ext.h" |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 94 | #include "resolv_private.h" |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 95 | |
chenbruce | d8cbb9b | 2019-06-20 18:25:28 +0800 | [diff] [blame] | 96 | // Set up Resolver state default settings. |
| 97 | // Note that res_ninit() is called with an initialized res_state, |
| 98 | // the memories it allocated must be freed after the task is done. |
| 99 | // Or memory leak will happen. |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 100 | int res_ninit(res_state statp) { |
chenbruce | d8cbb9b | 2019-06-20 18:25:28 +0800 | [diff] [blame] | 101 | int nserv = 0; // number of nameserver records |
nuccachen | b980f2f | 2018-10-23 17:10:58 +0800 | [diff] [blame] | 102 | sockaddr_union u[2]; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 103 | |
chenbruce | d8cbb9b | 2019-06-20 18:25:28 +0800 | [diff] [blame] | 104 | statp->netid = NETID_UNSET; |
| 105 | statp->id = arc4random_uniform(65536); |
| 106 | statp->_mark = MARK_UNSET; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 107 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 108 | memset(u, 0, sizeof(u)); |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 109 | u[nserv].sin.sin_addr.s_addr = INADDR_ANY; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 110 | u[nserv].sin.sin_family = AF_INET; |
| 111 | u[nserv].sin.sin_port = htons(NAMESERVER_PORT); |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 112 | nserv++; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 113 | statp->nscount = 0; |
| 114 | statp->ndots = 1; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 115 | statp->_vcsock = -1; |
| 116 | statp->_flags = 0; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 117 | statp->_u._ext.nscount = 0; |
Bernie Innocenti | ac18b12 | 2018-10-01 23:10:18 +0900 | [diff] [blame] | 118 | statp->_u._ext.ext = (res_state_ext*) malloc(sizeof(*statp->_u._ext.ext)); |
chenbruce | d8cbb9b | 2019-06-20 18:25:28 +0800 | [diff] [blame] | 119 | statp->netcontext_flags = 0; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 120 | if (statp->_u._ext.ext != NULL) { |
| 121 | memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); |
| 122 | statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; |
| 123 | strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); |
| 124 | strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); |
| 125 | } |
| 126 | statp->nsort = 0; |
| 127 | res_setservers(statp, u, nserv); |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 128 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 129 | if (nserv > 0) { |
| 130 | statp->nscount = nserv; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 131 | } |
| 132 | return (0); |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 133 | } |
| 134 | |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 135 | |
Bernie Innocenti | f33a63f | 2018-08-30 12:04:03 +0900 | [diff] [blame] | 136 | /* |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 137 | * This routine is for closing the socket if a virtual circuit is used and |
| 138 | * the program wants to close it. This provides support for endhostent() |
| 139 | * which expects to close the socket. |
| 140 | * |
| 141 | * This routine is not expected to be user visible. |
| 142 | */ |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 143 | void res_nclose(res_state statp) { |
| 144 | int ns; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 145 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 146 | if (statp->_vcsock >= 0) { |
| 147 | (void) close(statp->_vcsock); |
| 148 | statp->_vcsock = -1; |
Bernie Innocenti | 9c2c06f | 2019-01-08 18:36:28 +0900 | [diff] [blame] | 149 | statp->_flags &= ~RES_F_VC; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 150 | } |
| 151 | for (ns = 0; ns < statp->_u._ext.nscount; ns++) { |
| 152 | if (statp->_u._ext.nssocks[ns] != -1) { |
| 153 | (void) close(statp->_u._ext.nssocks[ns]); |
| 154 | statp->_u._ext.nssocks[ns] = -1; |
| 155 | } |
| 156 | } |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 157 | } |
| 158 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 159 | void res_ndestroy(res_state statp) { |
| 160 | res_nclose(statp); |
| 161 | if (statp->_u._ext.ext != NULL) free(statp->_u._ext.ext); |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 162 | statp->_u._ext.ext = NULL; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 163 | } |
| 164 | |
nuccachen | b980f2f | 2018-10-23 17:10:58 +0800 | [diff] [blame] | 165 | void res_setservers(res_state statp, const sockaddr_union* set, int cnt) { |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 166 | int i, nserv; |
| 167 | size_t size; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 168 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 169 | /* close open servers */ |
| 170 | res_nclose(statp); |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 171 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 172 | /* cause rtt times to be forgotten */ |
| 173 | statp->_u._ext.nscount = 0; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 174 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 175 | nserv = 0; |
| 176 | for (i = 0; i < cnt && nserv < MAXNS; i++) { |
| 177 | switch (set->sin.sin_family) { |
| 178 | case AF_INET: |
| 179 | size = sizeof(set->sin); |
| 180 | if (statp->_u._ext.ext) |
| 181 | memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &set->sin, size); |
| 182 | if (size <= sizeof(statp->nsaddr_list[nserv])) |
| 183 | memcpy(&statp->nsaddr_list[nserv], &set->sin, size); |
| 184 | else |
| 185 | statp->nsaddr_list[nserv].sin_family = 0; |
| 186 | nserv++; |
| 187 | break; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 188 | |
| 189 | #ifdef HAS_INET6_STRUCTS |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 190 | case AF_INET6: |
| 191 | size = sizeof(set->sin6); |
| 192 | if (statp->_u._ext.ext) |
| 193 | memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &set->sin6, size); |
| 194 | if (size <= sizeof(statp->nsaddr_list[nserv])) |
| 195 | memcpy(&statp->nsaddr_list[nserv], &set->sin6, size); |
| 196 | else |
| 197 | statp->nsaddr_list[nserv].sin_family = 0; |
| 198 | nserv++; |
| 199 | break; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 200 | #endif |
| 201 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 202 | default: |
| 203 | break; |
| 204 | } |
| 205 | set++; |
| 206 | } |
| 207 | statp->nscount = nserv; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 208 | } |
| 209 | |
nuccachen | b980f2f | 2018-10-23 17:10:58 +0800 | [diff] [blame] | 210 | int res_getservers(res_state statp, sockaddr_union* set, int cnt) { |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 211 | int i; |
| 212 | size_t size; |
| 213 | uint16_t family; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 214 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 215 | for (i = 0; i < statp->nscount && i < cnt; i++) { |
| 216 | if (statp->_u._ext.ext) |
| 217 | family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; |
| 218 | else |
| 219 | family = statp->nsaddr_list[i].sin_family; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 220 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 221 | switch (family) { |
| 222 | case AF_INET: |
| 223 | size = sizeof(set->sin); |
| 224 | if (statp->_u._ext.ext) |
| 225 | memcpy(&set->sin, &statp->_u._ext.ext->nsaddrs[i], size); |
| 226 | else |
| 227 | memcpy(&set->sin, &statp->nsaddr_list[i], size); |
| 228 | break; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 229 | |
| 230 | #ifdef HAS_INET6_STRUCTS |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 231 | case AF_INET6: |
| 232 | size = sizeof(set->sin6); |
| 233 | if (statp->_u._ext.ext) |
| 234 | memcpy(&set->sin6, &statp->_u._ext.ext->nsaddrs[i], size); |
| 235 | else |
| 236 | memcpy(&set->sin6, &statp->nsaddr_list[i], size); |
| 237 | break; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 238 | #endif |
| 239 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 240 | default: |
| 241 | set->sin.sin_family = 0; |
| 242 | break; |
| 243 | } |
| 244 | set++; |
| 245 | } |
| 246 | return (statp->nscount); |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 247 | } |
| 248 | |
lifr | 9498178 | 2019-05-17 21:15:19 +0800 | [diff] [blame] | 249 | void res_setnetcontext(res_state statp, const struct android_net_context* netcontext, |
| 250 | android::net::NetworkDnsEventReported* _Nonnull event) { |
chenbruce | d8cbb9b | 2019-06-20 18:25:28 +0800 | [diff] [blame] | 251 | if (statp != nullptr) { |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 252 | statp->netid = netcontext->dns_netid; |
Sehee Park | 2c11878 | 2019-05-07 13:02:45 +0900 | [diff] [blame] | 253 | statp->uid = netcontext->uid; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 254 | statp->_mark = netcontext->dns_mark; |
chenbruce | d8cbb9b | 2019-06-20 18:25:28 +0800 | [diff] [blame] | 255 | statp->netcontext_flags = netcontext->flags; |
lifr | 9498178 | 2019-05-17 21:15:19 +0800 | [diff] [blame] | 256 | statp->event = event; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 257 | } |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 258 | } |