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. |
Bernie Innocenti | d35d292 | 2019-10-08 23:34:53 +0900 | [diff] [blame^] | 97 | // Note: this is called with statp zero-initialized |
| 98 | void res_init(res_state statp) { |
chenbruce | d8cbb9b | 2019-06-20 18:25:28 +0800 | [diff] [blame] | 99 | statp->netid = NETID_UNSET; |
| 100 | statp->id = arc4random_uniform(65536); |
| 101 | statp->_mark = MARK_UNSET; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 102 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 103 | statp->nscount = 0; |
| 104 | statp->ndots = 1; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 105 | statp->_vcsock = -1; |
| 106 | statp->_flags = 0; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 107 | statp->_u._ext.nscount = 0; |
Bernie Innocenti | ac18b12 | 2018-10-01 23:10:18 +0900 | [diff] [blame] | 108 | statp->_u._ext.ext = (res_state_ext*) malloc(sizeof(*statp->_u._ext.ext)); |
chenbruce | d8cbb9b | 2019-06-20 18:25:28 +0800 | [diff] [blame] | 109 | statp->netcontext_flags = 0; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 110 | if (statp->_u._ext.ext != NULL) { |
| 111 | memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 112 | } |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 113 | |
Bernie Innocenti | d35d292 | 2019-10-08 23:34:53 +0900 | [diff] [blame^] | 114 | // The following dummy initialization is probably useless because |
| 115 | // it's overwritten later by _resolv_populate_res_for_net(). |
| 116 | // TODO: check if it's safe to remove. |
| 117 | const sockaddr_union u{ |
| 118 | .sin.sin_addr.s_addr = INADDR_ANY, |
| 119 | .sin.sin_family = AF_INET, |
| 120 | .sin.sin_port = htons(NAMESERVER_PORT), |
| 121 | }; |
| 122 | memcpy(&statp->_u._ext.ext->nsaddrs[0], &u, sizeof(u)); |
| 123 | statp->nscount = 1; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 124 | } |
| 125 | |
Bernie Innocenti | f33a63f | 2018-08-30 12:04:03 +0900 | [diff] [blame] | 126 | /* |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 127 | * This routine is for closing the socket if a virtual circuit is used and |
| 128 | * the program wants to close it. This provides support for endhostent() |
| 129 | * which expects to close the socket. |
| 130 | * |
| 131 | * This routine is not expected to be user visible. |
| 132 | */ |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 133 | void res_nclose(res_state statp) { |
| 134 | int ns; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 135 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 136 | if (statp->_vcsock >= 0) { |
| 137 | (void) close(statp->_vcsock); |
| 138 | statp->_vcsock = -1; |
Bernie Innocenti | 9c2c06f | 2019-01-08 18:36:28 +0900 | [diff] [blame] | 139 | statp->_flags &= ~RES_F_VC; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 140 | } |
| 141 | for (ns = 0; ns < statp->_u._ext.nscount; ns++) { |
| 142 | if (statp->_u._ext.nssocks[ns] != -1) { |
| 143 | (void) close(statp->_u._ext.nssocks[ns]); |
| 144 | statp->_u._ext.nssocks[ns] = -1; |
| 145 | } |
| 146 | } |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 147 | } |
| 148 | |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 149 | void res_ndestroy(res_state statp) { |
| 150 | res_nclose(statp); |
| 151 | if (statp->_u._ext.ext != NULL) free(statp->_u._ext.ext); |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 152 | statp->_u._ext.ext = NULL; |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 153 | } |
| 154 | |
lifr | 9498178 | 2019-05-17 21:15:19 +0800 | [diff] [blame] | 155 | void res_setnetcontext(res_state statp, const struct android_net_context* netcontext, |
| 156 | android::net::NetworkDnsEventReported* _Nonnull event) { |
chenbruce | d8cbb9b | 2019-06-20 18:25:28 +0800 | [diff] [blame] | 157 | if (statp != nullptr) { |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 158 | statp->netid = netcontext->dns_netid; |
Sehee Park | 2c11878 | 2019-05-07 13:02:45 +0900 | [diff] [blame] | 159 | statp->uid = netcontext->uid; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 160 | statp->_mark = netcontext->dns_mark; |
chenbruce | d8cbb9b | 2019-06-20 18:25:28 +0800 | [diff] [blame] | 161 | statp->netcontext_flags = netcontext->flags; |
lifr | 9498178 | 2019-05-17 21:15:19 +0800 | [diff] [blame] | 162 | statp->event = event; |
Bernie Innocenti | 8ad893f | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 163 | } |
Bernie Innocenti | 318ed2d | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 164 | } |