Bernie Innocenti | 5586419 | 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 | */ |
| 72 | |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 73 | #include <sys/param.h> |
| 74 | #include <sys/socket.h> |
| 75 | #include <sys/time.h> |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 76 | #include <sys/types.h> |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 77 | |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 78 | #include <arpa/inet.h> |
| 79 | #include <arpa/nameser.h> |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 80 | #include <netinet/in.h> |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 81 | |
| 82 | #include <ctype.h> |
Bernie Innocenti | 2fd418e | 2018-08-30 12:04:03 +0900 | [diff] [blame^] | 83 | #include <errno.h> |
| 84 | #include <fcntl.h> |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 85 | #include <netdb.h> |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 86 | #include <stdio.h> |
| 87 | #include <stdlib.h> |
| 88 | #include <string.h> |
| 89 | #include <unistd.h> |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 90 | |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 91 | /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 92 | #include "resolv_netid.h" |
| 93 | #include "resolv_private.h" |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 94 | |
| 95 | #include "res_private.h" |
| 96 | |
| 97 | /* Options. Should all be left alone. */ |
| 98 | #ifndef DEBUG |
| 99 | #define DEBUG |
| 100 | #endif |
| 101 | |
Bernie Innocenti | 2fd418e | 2018-08-30 12:04:03 +0900 | [diff] [blame^] | 102 | static void res_setoptions(res_state, const char*, const char*); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 103 | |
| 104 | /* |
| 105 | * Resolver state default settings. |
| 106 | */ |
| 107 | |
| 108 | /* |
| 109 | * Set up default settings. If the configuration file exist, the values |
| 110 | * there will have precedence. Otherwise, the server address is set to |
| 111 | * INADDR_ANY and the default domain name comes from the gethostname(). |
| 112 | * |
| 113 | * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 |
| 114 | * rather than INADDR_ANY ("0.0.0.0") as the default name server address |
| 115 | * since it was noted that INADDR_ANY actually meant ``the first interface |
| 116 | * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, |
| 117 | * it had to be "up" in order for you to reach your own name server. It |
| 118 | * was later decided that since the recommended practice is to always |
| 119 | * install local static routes through 127.0.0.1 for all your network |
| 120 | * interfaces, that we could solve this problem without a code change. |
| 121 | * |
| 122 | * The configuration file should always be used, since it is the only way |
| 123 | * to specify a default domain. If you are running a server on your local |
| 124 | * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" |
| 125 | * in the configuration file. |
| 126 | * |
| 127 | * Return 0 if completes successfully, -1 on error |
| 128 | */ |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 129 | int res_ninit(res_state statp) { |
| 130 | extern int __res_vinit(res_state, int); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 131 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 132 | return (__res_vinit(statp, 0)); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | /* This function has to be reachable by res_data.c but not publicly. */ |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 136 | int __res_vinit(res_state statp, int preinit) { |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 137 | #if !defined(__BIONIC__) |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 138 | register FILE* fp; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 139 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 140 | register char *cp, **pp; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 141 | #if !defined(__BIONIC__) |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 142 | register int n; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 143 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 144 | char buf[BUFSIZ]; |
| 145 | int nserv = 0; /* number of nameserver records read from file */ |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 146 | #if !defined(__BIONIC__) |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 147 | int haveenv = 0; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 148 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 149 | int havesearch = 0; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 150 | #if !defined(__BIONIC__) |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 151 | char* net; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 152 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 153 | int dots; |
| 154 | union res_sockaddr_union u[2]; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 155 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 156 | if ((statp->options & RES_INIT) != 0U) res_ndestroy(statp); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 157 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 158 | if (!preinit) { |
| 159 | statp->netid = NETID_UNSET; |
| 160 | statp->retrans = RES_TIMEOUT; |
| 161 | statp->retry = RES_DFLRETRY; |
| 162 | statp->options = RES_DEFAULT; |
| 163 | statp->id = res_randomid(); |
| 164 | statp->_mark = MARK_UNSET; |
| 165 | } |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 166 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 167 | memset(u, 0, sizeof(u)); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 168 | #ifdef USELOOPBACK |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 169 | u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 170 | #else |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 171 | u[nserv].sin.sin_addr.s_addr = INADDR_ANY; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 172 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 173 | u[nserv].sin.sin_family = AF_INET; |
| 174 | u[nserv].sin.sin_port = htons(NAMESERVER_PORT); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 175 | #ifdef HAVE_SA_LEN |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 176 | u[nserv].sin.sin_len = sizeof(struct sockaddr_in); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 177 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 178 | nserv++; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 179 | #ifdef HAS_INET6_STRUCTS |
| 180 | #ifdef USELOOPBACK |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 181 | u[nserv].sin6.sin6_addr = in6addr_loopback; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 182 | #else |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 183 | u[nserv].sin6.sin6_addr = in6addr_any; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 184 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 185 | u[nserv].sin6.sin6_family = AF_INET6; |
| 186 | u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 187 | #ifdef HAVE_SA_LEN |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 188 | u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 189 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 190 | nserv++; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 191 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 192 | statp->nscount = 0; |
| 193 | statp->ndots = 1; |
| 194 | statp->pfcode = 0; |
| 195 | statp->_vcsock = -1; |
| 196 | statp->_flags = 0; |
| 197 | statp->qhook = NULL; |
| 198 | statp->rhook = NULL; |
| 199 | statp->_u._ext.nscount = 0; |
| 200 | statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext)); |
| 201 | if (statp->_u._ext.ext != NULL) { |
| 202 | memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext)); |
| 203 | statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr; |
| 204 | strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa"); |
| 205 | strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int"); |
| 206 | } |
| 207 | statp->nsort = 0; |
| 208 | res_setservers(statp, u, nserv); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 209 | |
| 210 | #if defined(__BIONIC__) |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 211 | /* Ignore the environment. */ |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 212 | #else |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 213 | /* Allow user to override the local domain definition */ |
| 214 | if ((cp = getenv("LOCALDOMAIN")) != NULL) { |
| 215 | (void) strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); |
| 216 | statp->defdname[sizeof(statp->defdname) - 1] = '\0'; |
| 217 | haveenv++; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 218 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 219 | /* |
| 220 | * Set search list to be blank-separated strings |
| 221 | * from rest of env value. Permits users of LOCALDOMAIN |
| 222 | * to still have a search list, and anyone to set the |
| 223 | * one that they want to use as an individual (even more |
| 224 | * important now that the rfc1535 stuff restricts searches) |
| 225 | */ |
| 226 | cp = statp->defdname; |
| 227 | pp = statp->dnsrch; |
| 228 | *pp++ = cp; |
| 229 | for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) { |
| 230 | if (*cp == '\n') /* silly backwards compat */ |
| 231 | break; |
| 232 | else if (*cp == ' ' || *cp == '\t') { |
| 233 | *cp = 0; |
| 234 | n = 1; |
| 235 | } else if (n) { |
| 236 | *pp++ = cp; |
| 237 | n = 0; |
| 238 | havesearch = 1; |
| 239 | } |
| 240 | } |
| 241 | /* null terminate last domain if there are excess */ |
| 242 | while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') cp++; |
| 243 | *cp = '\0'; |
| 244 | *pp++ = 0; |
| 245 | } |
| 246 | if (nserv > 0) statp->nscount = nserv; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 247 | #endif |
| 248 | |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 249 | /* |
| 250 | * Last chance to get a nameserver. This should not normally |
| 251 | * be necessary |
| 252 | */ |
| 253 | #ifdef NO_RESOLV_CONF |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 254 | if (nserv == 0) nserv = get_nameservers(statp); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 255 | #endif |
| 256 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 257 | if (statp->defdname[0] == 0 && gethostname(buf, sizeof(statp->defdname) - 1) == 0 && |
| 258 | (cp = strchr(buf, '.')) != NULL) |
| 259 | strcpy(statp->defdname, cp + 1); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 260 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 261 | /* find components of local domain that might be searched */ |
| 262 | if (havesearch == 0) { |
| 263 | pp = statp->dnsrch; |
| 264 | *pp++ = statp->defdname; |
| 265 | *pp = NULL; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 266 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 267 | dots = 0; |
| 268 | for (cp = statp->defdname; *cp; cp++) dots += (*cp == '.'); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 269 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 270 | cp = statp->defdname; |
| 271 | while (pp < statp->dnsrch + MAXDFLSRCH) { |
| 272 | if (dots < LOCALDOMAINPARTS) break; |
| 273 | cp = strchr(cp, '.') + 1; /* we know there is one */ |
| 274 | *pp++ = cp; |
| 275 | dots--; |
| 276 | } |
| 277 | *pp = NULL; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 278 | #ifdef DEBUG |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 279 | if (statp->options & RES_DEBUG) { |
| 280 | printf(";; res_init()... default dnsrch list:\n"); |
| 281 | for (pp = statp->dnsrch; *pp; pp++) printf(";;\t%s\n", *pp); |
| 282 | printf(";;\t..END..\n"); |
| 283 | } |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 284 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 285 | } |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 286 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 287 | if ((cp = getenv("RES_OPTIONS")) != NULL) res_setoptions(statp, cp, "env"); |
| 288 | if (nserv > 0) { |
| 289 | statp->nscount = nserv; |
| 290 | statp->options |= RES_INIT; |
| 291 | } |
| 292 | return (0); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 293 | } |
| 294 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 295 | static void res_setoptions(res_state statp, const char* options, const char* source) { |
| 296 | const char* cp = options; |
| 297 | int i; |
| 298 | struct __res_state_ext* ext = statp->_u._ext.ext; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 299 | |
| 300 | #ifdef DEBUG |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 301 | if (statp->options & RES_DEBUG) |
| 302 | printf(";; res_setoptions(\"%s\", \"%s\")...\n", options, source); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 303 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 304 | while (*cp) { |
| 305 | /* skip leading and inner runs of spaces */ |
| 306 | while (*cp == ' ' || *cp == '\t') cp++; |
| 307 | /* search for and process individual options */ |
| 308 | if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { |
| 309 | i = atoi(cp + sizeof("ndots:") - 1); |
| 310 | if (i <= RES_MAXNDOTS) |
| 311 | statp->ndots = i; |
| 312 | else |
| 313 | statp->ndots = RES_MAXNDOTS; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 314 | #ifdef DEBUG |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 315 | if (statp->options & RES_DEBUG) printf(";;\tndots=%d\n", statp->ndots); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 316 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 317 | } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { |
| 318 | i = atoi(cp + sizeof("timeout:") - 1); |
| 319 | if (i <= RES_MAXRETRANS) |
| 320 | statp->retrans = i; |
| 321 | else |
| 322 | statp->retrans = RES_MAXRETRANS; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 323 | #ifdef DEBUG |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 324 | if (statp->options & RES_DEBUG) printf(";;\ttimeout=%d\n", statp->retrans); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 325 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 326 | } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)) { |
| 327 | i = atoi(cp + sizeof("attempts:") - 1); |
| 328 | if (i <= RES_MAXRETRY) |
| 329 | statp->retry = i; |
| 330 | else |
| 331 | statp->retry = RES_MAXRETRY; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 332 | #ifdef DEBUG |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 333 | if (statp->options & RES_DEBUG) printf(";;\tattempts=%d\n", statp->retry); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 334 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 335 | } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 336 | #ifdef DEBUG |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 337 | if (!(statp->options & RES_DEBUG)) { |
| 338 | printf(";; res_setoptions(\"%s\", \"%s\")..\n", options, source); |
| 339 | statp->options |= RES_DEBUG; |
| 340 | } |
| 341 | printf(";;\tdebug\n"); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 342 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 343 | } else if (!strncmp(cp, "no_tld_query", sizeof("no_tld_query") - 1) || |
| 344 | !strncmp(cp, "no-tld-query", sizeof("no-tld-query") - 1)) { |
| 345 | statp->options |= RES_NOTLDQUERY; |
| 346 | } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { |
| 347 | statp->options |= RES_USE_INET6; |
| 348 | } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { |
| 349 | statp->options |= RES_ROTATE; |
| 350 | } else if (!strncmp(cp, "no-check-names", sizeof("no-check-names") - 1)) { |
| 351 | statp->options |= RES_NOCHECKNAME; |
| 352 | } |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 353 | #ifdef RES_USE_EDNS0 |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 354 | else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) { |
| 355 | statp->options |= RES_USE_EDNS0; |
| 356 | } |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 357 | #endif |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 358 | else if (!strncmp(cp, "dname", sizeof("dname") - 1)) { |
| 359 | statp->options |= RES_USE_DNAME; |
| 360 | } else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) { |
| 361 | if (ext == NULL) goto skip; |
| 362 | cp += sizeof("nibble:") - 1; |
| 363 | i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1); |
| 364 | strncpy(ext->nsuffix, cp, (size_t) i); |
| 365 | ext->nsuffix[i] = '\0'; |
| 366 | } else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) { |
| 367 | if (ext == NULL) goto skip; |
| 368 | cp += sizeof("nibble2:") - 1; |
| 369 | i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1); |
| 370 | strncpy(ext->nsuffix2, cp, (size_t) i); |
| 371 | ext->nsuffix2[i] = '\0'; |
| 372 | } else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) { |
| 373 | cp += sizeof("v6revmode:") - 1; |
| 374 | /* "nibble" and "bitstring" used to be valid */ |
| 375 | if (!strncmp(cp, "single", sizeof("single") - 1)) { |
| 376 | statp->options |= RES_NO_NIBBLE2; |
| 377 | } else if (!strncmp(cp, "both", sizeof("both") - 1)) { |
| 378 | statp->options &= ~RES_NO_NIBBLE2; |
| 379 | } |
| 380 | } else { |
| 381 | /* XXX - print a warning here? */ |
| 382 | } |
| 383 | skip: |
| 384 | /* skip to next run of spaces */ |
| 385 | while (*cp && *cp != ' ' && *cp != '\t') cp++; |
| 386 | } |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 387 | } |
| 388 | |
Bernie Innocenti | 2fd418e | 2018-08-30 12:04:03 +0900 | [diff] [blame^] | 389 | /* |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 390 | * This routine is for closing the socket if a virtual circuit is used and |
| 391 | * the program wants to close it. This provides support for endhostent() |
| 392 | * which expects to close the socket. |
| 393 | * |
| 394 | * This routine is not expected to be user visible. |
| 395 | */ |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 396 | void res_nclose(res_state statp) { |
| 397 | int ns; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 398 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 399 | if (statp->_vcsock >= 0) { |
| 400 | (void) close(statp->_vcsock); |
| 401 | statp->_vcsock = -1; |
| 402 | statp->_flags &= ~(RES_F_VC | RES_F_CONN); |
| 403 | } |
| 404 | for (ns = 0; ns < statp->_u._ext.nscount; ns++) { |
| 405 | if (statp->_u._ext.nssocks[ns] != -1) { |
| 406 | (void) close(statp->_u._ext.nssocks[ns]); |
| 407 | statp->_u._ext.nssocks[ns] = -1; |
| 408 | } |
| 409 | } |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 410 | } |
| 411 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 412 | void res_ndestroy(res_state statp) { |
| 413 | res_nclose(statp); |
| 414 | if (statp->_u._ext.ext != NULL) free(statp->_u._ext.ext); |
| 415 | statp->options &= ~RES_INIT; |
| 416 | statp->_u._ext.ext = NULL; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 417 | } |
| 418 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 419 | const char* res_get_nibblesuffix(res_state statp) { |
| 420 | if (statp->_u._ext.ext) return (statp->_u._ext.ext->nsuffix); |
| 421 | return ("ip6.arpa"); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 422 | } |
| 423 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 424 | const char* res_get_nibblesuffix2(res_state statp) { |
| 425 | if (statp->_u._ext.ext) return (statp->_u._ext.ext->nsuffix2); |
| 426 | return ("ip6.int"); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 427 | } |
| 428 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 429 | void res_setservers(res_state statp, const union res_sockaddr_union* set, int cnt) { |
| 430 | int i, nserv; |
| 431 | size_t size; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 432 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 433 | /* close open servers */ |
| 434 | res_nclose(statp); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 435 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 436 | /* cause rtt times to be forgotten */ |
| 437 | statp->_u._ext.nscount = 0; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 438 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 439 | nserv = 0; |
| 440 | for (i = 0; i < cnt && nserv < MAXNS; i++) { |
| 441 | switch (set->sin.sin_family) { |
| 442 | case AF_INET: |
| 443 | size = sizeof(set->sin); |
| 444 | if (statp->_u._ext.ext) |
| 445 | memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &set->sin, size); |
| 446 | if (size <= sizeof(statp->nsaddr_list[nserv])) |
| 447 | memcpy(&statp->nsaddr_list[nserv], &set->sin, size); |
| 448 | else |
| 449 | statp->nsaddr_list[nserv].sin_family = 0; |
| 450 | nserv++; |
| 451 | break; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 452 | |
| 453 | #ifdef HAS_INET6_STRUCTS |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 454 | case AF_INET6: |
| 455 | size = sizeof(set->sin6); |
| 456 | if (statp->_u._ext.ext) |
| 457 | memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &set->sin6, size); |
| 458 | if (size <= sizeof(statp->nsaddr_list[nserv])) |
| 459 | memcpy(&statp->nsaddr_list[nserv], &set->sin6, size); |
| 460 | else |
| 461 | statp->nsaddr_list[nserv].sin_family = 0; |
| 462 | nserv++; |
| 463 | break; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 464 | #endif |
| 465 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 466 | default: |
| 467 | break; |
| 468 | } |
| 469 | set++; |
| 470 | } |
| 471 | statp->nscount = nserv; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 472 | } |
| 473 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 474 | int res_getservers(res_state statp, union res_sockaddr_union* set, int cnt) { |
| 475 | int i; |
| 476 | size_t size; |
| 477 | uint16_t family; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 478 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 479 | for (i = 0; i < statp->nscount && i < cnt; i++) { |
| 480 | if (statp->_u._ext.ext) |
| 481 | family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family; |
| 482 | else |
| 483 | family = statp->nsaddr_list[i].sin_family; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 484 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 485 | switch (family) { |
| 486 | case AF_INET: |
| 487 | size = sizeof(set->sin); |
| 488 | if (statp->_u._ext.ext) |
| 489 | memcpy(&set->sin, &statp->_u._ext.ext->nsaddrs[i], size); |
| 490 | else |
| 491 | memcpy(&set->sin, &statp->nsaddr_list[i], size); |
| 492 | break; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 493 | |
| 494 | #ifdef HAS_INET6_STRUCTS |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 495 | case AF_INET6: |
| 496 | size = sizeof(set->sin6); |
| 497 | if (statp->_u._ext.ext) |
| 498 | memcpy(&set->sin6, &statp->_u._ext.ext->nsaddrs[i], size); |
| 499 | else |
| 500 | memcpy(&set->sin6, &statp->nsaddr_list[i], size); |
| 501 | break; |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 502 | #endif |
| 503 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 504 | default: |
| 505 | set->sin.sin_family = 0; |
| 506 | break; |
| 507 | } |
| 508 | set++; |
| 509 | } |
| 510 | return (statp->nscount); |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 511 | } |
| 512 | |
Bernie Innocenti | f12d5bb | 2018-08-31 14:09:46 +0900 | [diff] [blame] | 513 | void res_setnetcontext(res_state statp, const struct android_net_context* netcontext) { |
| 514 | if (statp != NULL) { |
| 515 | statp->netid = netcontext->dns_netid; |
| 516 | statp->_mark = netcontext->dns_mark; |
| 517 | statp->qhook = netcontext->qhook; |
| 518 | if (netcontext->flags & NET_CONTEXT_FLAG_USE_EDNS) { |
| 519 | statp->options |= RES_USE_EDNS0 | RES_USE_DNSSEC; |
| 520 | } |
| 521 | } |
Bernie Innocenti | 5586419 | 2018-08-30 04:05:20 +0900 | [diff] [blame] | 522 | } |