The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1 | /* $NetBSD: getaddrinfo.c,v 1.82 2006/03/25 12:09:40 rpaulo Exp $ */ |
| 2 | /* $KAME: getaddrinfo.c,v 1.29 2000/08/31 17:26:57 itojun Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the project nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | /* |
| 34 | * Issues to be discussed: |
| 35 | * - Thread safe-ness must be checked. |
| 36 | * - Return values. There are nonstandard return values defined and used |
| 37 | * in the source code. This is because RFC2553 is silent about which error |
| 38 | * code must be returned for which situation. |
| 39 | * - IPv4 classful (shortened) form. RFC2553 is silent about it. XNET 5.2 |
| 40 | * says to use inet_aton() to convert IPv4 numeric to binary (alows |
| 41 | * classful form as a result). |
| 42 | * current code - disallow classful form for IPv4 (due to use of inet_pton). |
| 43 | * - freeaddrinfo(NULL). RFC2553 is silent about it. XNET 5.2 says it is |
| 44 | * invalid. |
| 45 | * current code - SEGV on freeaddrinfo(NULL) |
| 46 | * Note: |
| 47 | * - We use getipnodebyname() just for thread-safeness. There's no intent |
| 48 | * to let it do PF_UNSPEC (actually we never pass PF_UNSPEC to |
| 49 | * getipnodebyname(). |
| 50 | * - The code filters out AFs that are not supported by the kernel, |
| 51 | * when globbing NULL hostname (to loopback, or wildcard). Is it the right |
| 52 | * thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG |
| 53 | * in ai_flags? |
| 54 | * - (post-2553) semantics of AI_ADDRCONFIG itself is too vague. |
| 55 | * (1) what should we do against numeric hostname (2) what should we do |
| 56 | * against NULL hostname (3) what is AI_ADDRCONFIG itself. AF not ready? |
| 57 | * non-loopback address configured? global address configured? |
| 58 | * - To avoid search order issue, we have a big amount of code duplicate |
| 59 | * from gethnamaddr.c and some other places. The issues that there's no |
| 60 | * lower layer function to lookup "IPv4 or IPv6" record. Calling |
| 61 | * gethostbyname2 from getaddrinfo will end up in wrong search order, as |
| 62 | * follows: |
| 63 | * - The code makes use of following calls when asked to resolver with |
| 64 | * ai_family = PF_UNSPEC: |
| 65 | * getipnodebyname(host, AF_INET6); |
| 66 | * getipnodebyname(host, AF_INET); |
| 67 | * This will result in the following queries if the node is configure to |
| 68 | * prefer /etc/hosts than DNS: |
| 69 | * lookup /etc/hosts for IPv6 address |
| 70 | * lookup DNS for IPv6 address |
| 71 | * lookup /etc/hosts for IPv4 address |
| 72 | * lookup DNS for IPv4 address |
| 73 | * which may not meet people's requirement. |
| 74 | * The right thing to happen is to have underlying layer which does |
| 75 | * PF_UNSPEC lookup (lookup both) and return chain of addrinfos. |
| 76 | * This would result in a bit of code duplicate with _dns_ghbyname() and |
| 77 | * friends. |
| 78 | */ |
| 79 | |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 80 | #include <fcntl.h> |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 81 | #include <sys/cdefs.h> |
| 82 | #include <sys/types.h> |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 83 | #include <sys/stat.h> |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 84 | #include <sys/param.h> |
| 85 | #include <sys/socket.h> |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 86 | #include <sys/un.h> |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 87 | #include <net/if.h> |
| 88 | #include <netinet/in.h> |
| 89 | #include <arpa/inet.h> |
Calin Juravle | 569fb98 | 2014-03-04 15:01:29 +0000 | [diff] [blame] | 90 | #include <arpa/nameser.h> |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 91 | #include <assert.h> |
| 92 | #include <ctype.h> |
| 93 | #include <errno.h> |
| 94 | #include <netdb.h> |
Sreeram Ramachandran | 57a2627 | 2014-05-19 10:21:39 -0700 | [diff] [blame] | 95 | #include "NetdClientDispatch.h" |
Szymon Jakubczak | ea9bf67 | 2014-02-14 17:07:23 -0500 | [diff] [blame] | 96 | #include "resolv_cache.h" |
| 97 | #include "resolv_netid.h" |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 98 | #include "resolv_private.h" |
Robert Greenwalt | 1d8d9a3 | 2013-08-02 15:24:45 -0700 | [diff] [blame] | 99 | #include <stdbool.h> |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 100 | #include <stddef.h> |
| 101 | #include <stdio.h> |
| 102 | #include <stdlib.h> |
| 103 | #include <string.h> |
Carl Shapiro | 2cc2b2b | 2011-03-21 20:01:03 -0700 | [diff] [blame] | 104 | #include <strings.h> |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 105 | #include <unistd.h> |
| 106 | |
| 107 | #include <syslog.h> |
| 108 | #include <stdarg.h> |
| 109 | #include "nsswitch.h" |
Victor Khimenko | 5956847 | 2018-03-14 17:41:22 +0100 | [diff] [blame] | 110 | #include "private/bionic_defs.h" |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 111 | |
Tom Marshall | 2af9972 | 2016-06-17 16:38:12 -0700 | [diff] [blame] | 112 | #include "hosts_cache.h" |
| 113 | |
David 'Digit' Turner | 50ace4f | 2010-06-16 16:36:41 -0700 | [diff] [blame] | 114 | typedef union sockaddr_union { |
| 115 | struct sockaddr generic; |
| 116 | struct sockaddr_in in; |
| 117 | struct sockaddr_in6 in6; |
| 118 | } sockaddr_union; |
| 119 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 120 | #define SUCCESS 0 |
| 121 | #define ANY 0 |
| 122 | #define YES 1 |
| 123 | #define NO 0 |
| 124 | |
| 125 | static const char in_addrany[] = { 0, 0, 0, 0 }; |
| 126 | static const char in_loopback[] = { 127, 0, 0, 1 }; |
| 127 | #ifdef INET6 |
| 128 | static const char in6_addrany[] = { |
| 129 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
| 130 | }; |
| 131 | static const char in6_loopback[] = { |
| 132 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 |
| 133 | }; |
| 134 | #endif |
| 135 | |
Dan Willemsen | 7ec52b1 | 2016-11-28 17:02:25 -0800 | [diff] [blame] | 136 | #if defined(__ANDROID__) |
Selim Gurun | 06e1831 | 2012-02-27 15:58:54 -0800 | [diff] [blame] | 137 | // This should be synchronized to ResponseCode.h |
| 138 | static const int DnsProxyQueryResult = 222; |
Dan Willemsen | 7ec52b1 | 2016-11-28 17:02:25 -0800 | [diff] [blame] | 139 | #endif |
Selim Gurun | 06e1831 | 2012-02-27 15:58:54 -0800 | [diff] [blame] | 140 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 141 | static const struct afd { |
| 142 | int a_af; |
| 143 | int a_addrlen; |
| 144 | int a_socklen; |
| 145 | int a_off; |
| 146 | const char *a_addrany; |
| 147 | const char *a_loopback; |
| 148 | int a_scoped; |
| 149 | } afdl [] = { |
| 150 | #ifdef INET6 |
| 151 | {PF_INET6, sizeof(struct in6_addr), |
| 152 | sizeof(struct sockaddr_in6), |
| 153 | offsetof(struct sockaddr_in6, sin6_addr), |
| 154 | in6_addrany, in6_loopback, 1}, |
| 155 | #endif |
| 156 | {PF_INET, sizeof(struct in_addr), |
| 157 | sizeof(struct sockaddr_in), |
| 158 | offsetof(struct sockaddr_in, sin_addr), |
| 159 | in_addrany, in_loopback, 0}, |
| 160 | {0, 0, 0, 0, NULL, NULL, 0}, |
| 161 | }; |
| 162 | |
| 163 | struct explore { |
| 164 | int e_af; |
| 165 | int e_socktype; |
| 166 | int e_protocol; |
| 167 | const char *e_protostr; |
| 168 | int e_wild; |
| 169 | #define WILD_AF(ex) ((ex)->e_wild & 0x01) |
| 170 | #define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02) |
| 171 | #define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04) |
| 172 | }; |
| 173 | |
| 174 | static const struct explore explore[] = { |
| 175 | #if 0 |
| 176 | { PF_LOCAL, 0, ANY, ANY, NULL, 0x01 }, |
| 177 | #endif |
| 178 | #ifdef INET6 |
| 179 | { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 }, |
| 180 | { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 }, |
| 181 | { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 }, |
| 182 | #endif |
| 183 | { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 }, |
| 184 | { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 }, |
| 185 | { PF_INET, SOCK_RAW, ANY, NULL, 0x05 }, |
| 186 | { PF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 }, |
| 187 | { PF_UNSPEC, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 }, |
| 188 | { PF_UNSPEC, SOCK_RAW, ANY, NULL, 0x05 }, |
| 189 | { -1, 0, 0, NULL, 0 }, |
| 190 | }; |
| 191 | |
| 192 | #ifdef INET6 |
| 193 | #define PTON_MAX 16 |
| 194 | #else |
| 195 | #define PTON_MAX 4 |
| 196 | #endif |
| 197 | |
| 198 | static const ns_src default_dns_files[] = { |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 199 | { NSSRC_FILES, NS_SUCCESS }, |
| 200 | { NSSRC_DNS, NS_SUCCESS }, |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 201 | { 0, 0 } |
| 202 | }; |
| 203 | |
Ben Schwartz | 47fb0e8 | 2018-01-31 13:35:03 -0500 | [diff] [blame] | 204 | #define MAXPACKET (8*1024) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 205 | |
| 206 | typedef union { |
| 207 | HEADER hdr; |
| 208 | u_char buf[MAXPACKET]; |
| 209 | } querybuf; |
| 210 | |
| 211 | struct res_target { |
| 212 | struct res_target *next; |
| 213 | const char *name; /* domain name */ |
| 214 | int qclass, qtype; /* class and type of query */ |
| 215 | u_char *answer; /* buffer to put answer */ |
| 216 | int anslen; /* size of answer buffer */ |
| 217 | int n; /* result length */ |
| 218 | }; |
| 219 | |
| 220 | static int str2number(const char *); |
| 221 | static int explore_fqdn(const struct addrinfo *, const char *, |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 222 | const char *, struct addrinfo **, const struct android_net_context *); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 223 | static int explore_null(const struct addrinfo *, |
| 224 | const char *, struct addrinfo **); |
| 225 | static int explore_numeric(const struct addrinfo *, const char *, |
| 226 | const char *, struct addrinfo **, const char *); |
| 227 | static int explore_numeric_scope(const struct addrinfo *, const char *, |
| 228 | const char *, struct addrinfo **); |
| 229 | static int get_canonname(const struct addrinfo *, |
| 230 | struct addrinfo *, const char *); |
| 231 | static struct addrinfo *get_ai(const struct addrinfo *, |
| 232 | const struct afd *, const char *); |
| 233 | static int get_portmatch(const struct addrinfo *, const char *); |
| 234 | static int get_port(const struct addrinfo *, const char *, int); |
| 235 | static const struct afd *find_afd(int); |
| 236 | #ifdef INET6 |
| 237 | static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *); |
| 238 | #endif |
| 239 | |
| 240 | static struct addrinfo *getanswer(const querybuf *, int, const char *, int, |
| 241 | const struct addrinfo *); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 242 | static int _dns_getaddrinfo(void *, void *, va_list); |
| 243 | static void _sethtent(FILE **); |
| 244 | static void _endhtent(FILE **); |
| 245 | static struct addrinfo *_gethtent(FILE **, const char *, |
| 246 | const struct addrinfo *); |
| 247 | static int _files_getaddrinfo(void *, void *, va_list); |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 248 | static int _find_src_addr(const struct sockaddr *, struct sockaddr *, unsigned , uid_t); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 249 | |
| 250 | static int res_queryN(const char *, struct res_target *, res_state); |
| 251 | static int res_searchN(const char *, struct res_target *, res_state); |
| 252 | static int res_querydomainN(const char *, const char *, |
| 253 | struct res_target *, res_state); |
| 254 | |
| 255 | static const char * const ai_errlist[] = { |
| 256 | "Success", |
| 257 | "Address family for hostname not supported", /* EAI_ADDRFAMILY */ |
| 258 | "Temporary failure in name resolution", /* EAI_AGAIN */ |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 259 | "Invalid value for ai_flags", /* EAI_BADFLAGS */ |
| 260 | "Non-recoverable failure in name resolution", /* EAI_FAIL */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 261 | "ai_family not supported", /* EAI_FAMILY */ |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 262 | "Memory allocation failure", /* EAI_MEMORY */ |
| 263 | "No address associated with hostname", /* EAI_NODATA */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 264 | "hostname nor servname provided, or not known", /* EAI_NONAME */ |
| 265 | "servname not supported for ai_socktype", /* EAI_SERVICE */ |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 266 | "ai_socktype not supported", /* EAI_SOCKTYPE */ |
| 267 | "System error returned in errno", /* EAI_SYSTEM */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 268 | "Invalid value for hints", /* EAI_BADHINTS */ |
| 269 | "Resolved protocol is unknown", /* EAI_PROTOCOL */ |
| 270 | "Argument buffer overflow", /* EAI_OVERFLOW */ |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 271 | "Unknown error", /* EAI_MAX */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 272 | }; |
| 273 | |
| 274 | /* XXX macros that make external reference is BAD. */ |
| 275 | |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 276 | #define GET_AI(ai, afd, addr) \ |
| 277 | do { \ |
| 278 | /* external reference: pai, error, and label free */ \ |
| 279 | (ai) = get_ai(pai, (afd), (addr)); \ |
| 280 | if ((ai) == NULL) { \ |
| 281 | error = EAI_MEMORY; \ |
| 282 | goto free; \ |
| 283 | } \ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 284 | } while (/*CONSTCOND*/0) |
| 285 | |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 286 | #define GET_PORT(ai, serv) \ |
| 287 | do { \ |
| 288 | /* external reference: error and label free */ \ |
| 289 | error = get_port((ai), (serv), 0); \ |
| 290 | if (error != 0) \ |
| 291 | goto free; \ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 292 | } while (/*CONSTCOND*/0) |
| 293 | |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 294 | #define GET_CANONNAME(ai, str) \ |
| 295 | do { \ |
| 296 | /* external reference: pai, error and label free */ \ |
| 297 | error = get_canonname(pai, (ai), (str)); \ |
| 298 | if (error != 0) \ |
| 299 | goto free; \ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 300 | } while (/*CONSTCOND*/0) |
| 301 | |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 302 | #define ERR(err) \ |
| 303 | do { \ |
| 304 | /* external reference: error, and label bad */ \ |
| 305 | error = (err); \ |
| 306 | goto bad; \ |
| 307 | /*NOTREACHED*/ \ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 308 | } while (/*CONSTCOND*/0) |
| 309 | |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 310 | #define MATCH_FAMILY(x, y, w) \ |
| 311 | ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || \ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 312 | (y) == PF_UNSPEC))) |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 313 | #define MATCH(x, y, w) \ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 314 | ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY))) |
| 315 | |
Victor Khimenko | 5956847 | 2018-03-14 17:41:22 +0100 | [diff] [blame] | 316 | __BIONIC_WEAK_FOR_NATIVE_BRIDGE |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 317 | const char * |
| 318 | gai_strerror(int ecode) |
| 319 | { |
| 320 | if (ecode < 0 || ecode > EAI_MAX) |
| 321 | ecode = EAI_MAX; |
| 322 | return ai_errlist[ecode]; |
| 323 | } |
| 324 | |
Victor Khimenko | 5956847 | 2018-03-14 17:41:22 +0100 | [diff] [blame] | 325 | __BIONIC_WEAK_FOR_NATIVE_BRIDGE |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 326 | void |
| 327 | freeaddrinfo(struct addrinfo *ai) |
| 328 | { |
| 329 | struct addrinfo *next; |
| 330 | |
Elliott Hughes | a9209d7 | 2016-09-16 18:16:47 -0700 | [diff] [blame] | 331 | #if defined(__BIONIC__) |
Elliott Hughes | c62a4b5 | 2015-01-08 17:28:46 -0800 | [diff] [blame] | 332 | if (ai == NULL) return; |
| 333 | #else |
| 334 | _DIAGASSERT(ai != NULL); |
| 335 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 336 | |
| 337 | do { |
| 338 | next = ai->ai_next; |
| 339 | if (ai->ai_canonname) |
| 340 | free(ai->ai_canonname); |
| 341 | /* no need to free(ai->ai_addr) */ |
| 342 | free(ai); |
| 343 | ai = next; |
| 344 | } while (ai); |
| 345 | } |
| 346 | |
| 347 | static int |
| 348 | str2number(const char *p) |
| 349 | { |
| 350 | char *ep; |
| 351 | unsigned long v; |
| 352 | |
| 353 | assert(p != NULL); |
| 354 | |
| 355 | if (*p == '\0') |
| 356 | return -1; |
| 357 | ep = NULL; |
| 358 | errno = 0; |
| 359 | v = strtoul(p, &ep, 10); |
| 360 | if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) |
| 361 | return v; |
| 362 | else |
| 363 | return -1; |
| 364 | } |
| 365 | |
Lorenzo Colitti | ba96e30 | 2011-01-14 12:26:05 -0800 | [diff] [blame] | 366 | /* |
Lorenzo Colitti | ba96e30 | 2011-01-14 12:26:05 -0800 | [diff] [blame] | 367 | * The following functions determine whether IPv4 or IPv6 connectivity is |
| 368 | * available in order to implement AI_ADDRCONFIG. |
| 369 | * |
| 370 | * Strictly speaking, AI_ADDRCONFIG should not look at whether connectivity is |
| 371 | * available, but whether addresses of the specified family are "configured |
| 372 | * on the local system". However, bionic doesn't currently support getifaddrs, |
| 373 | * so checking for connectivity is the next best thing. |
| 374 | */ |
| 375 | static int |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 376 | _have_ipv6(unsigned mark, uid_t uid) { |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 377 | static const struct sockaddr_in6 sin6_test = { |
| 378 | .sin6_family = AF_INET6, |
| 379 | .sin6_addr.s6_addr = { // 2000:: |
| 380 | 0x20, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} |
| 381 | }; |
Szymon Jakubczak | ea9bf67 | 2014-02-14 17:07:23 -0500 | [diff] [blame] | 382 | sockaddr_union addr = { .in6 = sin6_test }; |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 383 | return _find_src_addr(&addr.generic, NULL, mark, uid) == 1; |
Lorenzo Colitti | ba96e30 | 2011-01-14 12:26:05 -0800 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | static int |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 387 | _have_ipv4(unsigned mark, uid_t uid) { |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 388 | static const struct sockaddr_in sin_test = { |
| 389 | .sin_family = AF_INET, |
| 390 | .sin_addr.s_addr = __constant_htonl(0x08080808L) // 8.8.8.8 |
| 391 | }; |
Szymon Jakubczak | ea9bf67 | 2014-02-14 17:07:23 -0500 | [diff] [blame] | 392 | sockaddr_union addr = { .in = sin_test }; |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 393 | return _find_src_addr(&addr.generic, NULL, mark, uid) == 1; |
Lorenzo Colitti | 3d8f4ad | 2009-08-03 22:36:31 -0700 | [diff] [blame] | 394 | } |
| 395 | |
Elliott Hughes | 55293c1 | 2014-11-12 17:00:30 -0800 | [diff] [blame] | 396 | bool readBE32(FILE* fp, int32_t* result) { |
| 397 | int32_t tmp; |
| 398 | if (fread(&tmp, sizeof(tmp), 1, fp) != 1) { |
| 399 | return false; |
| 400 | } |
| 401 | *result = ntohl(tmp); |
| 402 | return true; |
| 403 | } |
| 404 | |
Dan Willemsen | 7ec52b1 | 2016-11-28 17:02:25 -0800 | [diff] [blame] | 405 | #if defined(__ANDROID__) |
Mattias Falk | c63e590 | 2011-08-23 14:34:14 +0200 | [diff] [blame] | 406 | // Returns 0 on success, else returns on error. |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 407 | static int |
| 408 | android_getaddrinfo_proxy( |
| 409 | const char *hostname, const char *servname, |
Szymon Jakubczak | ea9bf67 | 2014-02-14 17:07:23 -0500 | [diff] [blame] | 410 | const struct addrinfo *hints, struct addrinfo **res, unsigned netid) |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 411 | { |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 412 | int success = 0; |
| 413 | |
| 414 | // Clear this at start, as we use its non-NULLness later (in the |
| 415 | // error path) to decide if we have to free up any memory we |
| 416 | // allocated in the process (before failing). |
| 417 | *res = NULL; |
| 418 | |
Mattias Falk | c63e590 | 2011-08-23 14:34:14 +0200 | [diff] [blame] | 419 | // Bogus things we can't serialize. Don't use the proxy. These will fail - let them. |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 420 | if ((hostname != NULL && |
| 421 | strcspn(hostname, " \n\r\t^'\"") != strlen(hostname)) || |
| 422 | (servname != NULL && |
| 423 | strcspn(servname, " \n\r\t^'\"") != strlen(servname))) { |
Mattias Falk | c63e590 | 2011-08-23 14:34:14 +0200 | [diff] [blame] | 424 | return EAI_NODATA; |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 425 | } |
| 426 | |
Luke Huang | e3ed892 | 2018-11-19 16:59:08 +0800 | [diff] [blame] | 427 | FILE* proxy = fdopen(__netdClientDispatch.dnsOpenProxy(), "r+"); |
Elliott Hughes | 9773fa3 | 2014-12-10 14:56:46 -0800 | [diff] [blame] | 428 | if (proxy == NULL) { |
| 429 | return EAI_SYSTEM; |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 430 | } |
Paul Jensen | 559c784 | 2014-05-15 14:43:07 -0400 | [diff] [blame] | 431 | netid = __netdClientDispatch.netIdForResolv(netid); |
| 432 | |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 433 | // Send the request. |
Szymon Jakubczak | ea9bf67 | 2014-02-14 17:07:23 -0500 | [diff] [blame] | 434 | if (fprintf(proxy, "getaddrinfo %s %s %d %d %d %d %u", |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 435 | hostname == NULL ? "^" : hostname, |
| 436 | servname == NULL ? "^" : servname, |
| 437 | hints == NULL ? -1 : hints->ai_flags, |
| 438 | hints == NULL ? -1 : hints->ai_family, |
| 439 | hints == NULL ? -1 : hints->ai_socktype, |
Mattias Falk | c63e590 | 2011-08-23 14:34:14 +0200 | [diff] [blame] | 440 | hints == NULL ? -1 : hints->ai_protocol, |
Szymon Jakubczak | ea9bf67 | 2014-02-14 17:07:23 -0500 | [diff] [blame] | 441 | netid) < 0) { |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 442 | goto exit; |
| 443 | } |
| 444 | // literal NULL byte at end, required by FrameworkListener |
| 445 | if (fputc(0, proxy) == EOF || |
| 446 | fflush(proxy) != 0) { |
| 447 | goto exit; |
| 448 | } |
| 449 | |
Robert Greenwalt | c59ba45 | 2012-03-09 11:34:27 -0800 | [diff] [blame] | 450 | char buf[4]; |
Selim Gurun | 06e1831 | 2012-02-27 15:58:54 -0800 | [diff] [blame] | 451 | // read result code for gethostbyaddr |
| 452 | if (fread(buf, 1, sizeof(buf), proxy) != sizeof(buf)) { |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 453 | goto exit; |
| 454 | } |
| 455 | |
Selim Gurun | 06e1831 | 2012-02-27 15:58:54 -0800 | [diff] [blame] | 456 | int result_code = (int)strtol(buf, NULL, 10); |
| 457 | // verify the code itself |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 458 | if (result_code != DnsProxyQueryResult) { |
Mattias Falk | c63e590 | 2011-08-23 14:34:14 +0200 | [diff] [blame] | 459 | fread(buf, 1, sizeof(buf), proxy); |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 460 | goto exit; |
| 461 | } |
| 462 | |
| 463 | struct addrinfo* ai = NULL; |
| 464 | struct addrinfo** nextres = res; |
| 465 | while (1) { |
Elliott Hughes | 55293c1 | 2014-11-12 17:00:30 -0800 | [diff] [blame] | 466 | int32_t have_more; |
| 467 | if (!readBE32(proxy, &have_more)) { |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 468 | break; |
| 469 | } |
Elliott Hughes | 55293c1 | 2014-11-12 17:00:30 -0800 | [diff] [blame] | 470 | if (have_more == 0) { |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 471 | success = 1; |
| 472 | break; |
| 473 | } |
| 474 | |
Elliott Hughes | e6418c8 | 2019-11-05 12:42:14 -0800 | [diff] [blame] | 475 | ai = calloc(1, sizeof(struct addrinfo) + sizeof(struct sockaddr_storage)); |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 476 | if (ai == NULL) { |
| 477 | break; |
| 478 | } |
Elliott Hughes | 55293c1 | 2014-11-12 17:00:30 -0800 | [diff] [blame] | 479 | ai->ai_addr = (struct sockaddr*)(ai + 1); |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 480 | |
Elliott Hughes | 55293c1 | 2014-11-12 17:00:30 -0800 | [diff] [blame] | 481 | // struct addrinfo { |
| 482 | // int ai_flags; /* AI_PASSIVE, AI_CANONNAME, AI_NUMERICHOST */ |
| 483 | // int ai_family; /* PF_xxx */ |
| 484 | // int ai_socktype; /* SOCK_xxx */ |
| 485 | // int ai_protocol; /* 0 or IPPROTO_xxx for IPv4 and IPv6 */ |
| 486 | // socklen_t ai_addrlen; /* length of ai_addr */ |
| 487 | // char *ai_canonname; /* canonical name for hostname */ |
| 488 | // struct sockaddr *ai_addr; /* binary address */ |
| 489 | // struct addrinfo *ai_next; /* next structure in linked list */ |
| 490 | // }; |
| 491 | |
| 492 | // Read the struct piece by piece because we might be a 32-bit process |
| 493 | // talking to a 64-bit netd. |
| 494 | int32_t addr_len; |
| 495 | bool success = |
| 496 | readBE32(proxy, &ai->ai_flags) && |
| 497 | readBE32(proxy, &ai->ai_family) && |
| 498 | readBE32(proxy, &ai->ai_socktype) && |
| 499 | readBE32(proxy, &ai->ai_protocol) && |
| 500 | readBE32(proxy, &addr_len); |
| 501 | if (!success) { |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 502 | break; |
| 503 | } |
| 504 | |
Elliott Hughes | 55293c1 | 2014-11-12 17:00:30 -0800 | [diff] [blame] | 505 | // Set ai_addrlen and read the ai_addr data. |
| 506 | ai->ai_addrlen = addr_len; |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 507 | if (addr_len != 0) { |
Elliott Hughes | 55293c1 | 2014-11-12 17:00:30 -0800 | [diff] [blame] | 508 | if ((size_t) addr_len > sizeof(struct sockaddr_storage)) { |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 509 | // Bogus; too big. |
| 510 | break; |
| 511 | } |
Elliott Hughes | 55293c1 | 2014-11-12 17:00:30 -0800 | [diff] [blame] | 512 | if (fread(ai->ai_addr, addr_len, 1, proxy) != 1) { |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 513 | break; |
| 514 | } |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 515 | } |
| 516 | |
Elliott Hughes | 55293c1 | 2014-11-12 17:00:30 -0800 | [diff] [blame] | 517 | // The string for ai_cannonname. |
| 518 | int32_t name_len; |
| 519 | if (!readBE32(proxy, &name_len)) { |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 520 | break; |
| 521 | } |
| 522 | if (name_len != 0) { |
| 523 | ai->ai_canonname = (char*) malloc(name_len); |
| 524 | if (fread(ai->ai_canonname, name_len, 1, proxy) != 1) { |
| 525 | break; |
| 526 | } |
| 527 | if (ai->ai_canonname[name_len - 1] != '\0') { |
| 528 | // The proxy should be returning this |
| 529 | // NULL-terminated. |
| 530 | break; |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | *nextres = ai; |
| 535 | nextres = &ai->ai_next; |
| 536 | ai = NULL; |
| 537 | } |
| 538 | |
| 539 | if (ai != NULL) { |
| 540 | // Clean up partially-built addrinfo that we never ended up |
| 541 | // attaching to the response. |
| 542 | freeaddrinfo(ai); |
| 543 | } |
| 544 | exit: |
| 545 | if (proxy != NULL) { |
| 546 | fclose(proxy); |
| 547 | } |
| 548 | |
| 549 | if (success) { |
| 550 | return 0; |
| 551 | } |
| 552 | |
Mattias Falk | c63e590 | 2011-08-23 14:34:14 +0200 | [diff] [blame] | 553 | // Proxy failed; |
| 554 | // clean up memory we might've allocated. |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 555 | if (*res) { |
| 556 | freeaddrinfo(*res); |
| 557 | *res = NULL; |
| 558 | } |
Mattias Falk | c63e590 | 2011-08-23 14:34:14 +0200 | [diff] [blame] | 559 | return EAI_NODATA; |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 560 | } |
Dan Willemsen | 7ec52b1 | 2016-11-28 17:02:25 -0800 | [diff] [blame] | 561 | #endif |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 562 | |
Victor Khimenko | 5956847 | 2018-03-14 17:41:22 +0100 | [diff] [blame] | 563 | __BIONIC_WEAK_FOR_NATIVE_BRIDGE |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 564 | int |
| 565 | getaddrinfo(const char *hostname, const char *servname, |
| 566 | const struct addrinfo *hints, struct addrinfo **res) |
| 567 | { |
Szymon Jakubczak | ea9bf67 | 2014-02-14 17:07:23 -0500 | [diff] [blame] | 568 | return android_getaddrinfofornet(hostname, servname, hints, NETID_UNSET, MARK_UNSET, res); |
Mattias Falk | c63e590 | 2011-08-23 14:34:14 +0200 | [diff] [blame] | 569 | } |
| 570 | |
Victor Khimenko | 5956847 | 2018-03-14 17:41:22 +0100 | [diff] [blame] | 571 | __BIONIC_WEAK_FOR_NATIVE_BRIDGE |
Mattias Falk | c63e590 | 2011-08-23 14:34:14 +0200 | [diff] [blame] | 572 | int |
Szymon Jakubczak | ea9bf67 | 2014-02-14 17:07:23 -0500 | [diff] [blame] | 573 | android_getaddrinfofornet(const char *hostname, const char *servname, |
| 574 | const struct addrinfo *hints, unsigned netid, unsigned mark, struct addrinfo **res) |
Mattias Falk | c63e590 | 2011-08-23 14:34:14 +0200 | [diff] [blame] | 575 | { |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 576 | struct android_net_context netcontext = { |
| 577 | .app_netid = netid, |
| 578 | .app_mark = mark, |
| 579 | .dns_netid = netid, |
| 580 | .dns_mark = mark, |
| 581 | .uid = NET_CONTEXT_INVALID_UID, |
| 582 | }; |
| 583 | return android_getaddrinfofornetcontext(hostname, servname, hints, &netcontext, res); |
| 584 | } |
| 585 | |
Victor Khimenko | 5956847 | 2018-03-14 17:41:22 +0100 | [diff] [blame] | 586 | __BIONIC_WEAK_FOR_NATIVE_BRIDGE |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 587 | int |
| 588 | android_getaddrinfofornetcontext(const char *hostname, const char *servname, |
| 589 | const struct addrinfo *hints, const struct android_net_context *netcontext, |
| 590 | struct addrinfo **res) |
| 591 | { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 592 | struct addrinfo sentinel; |
| 593 | struct addrinfo *cur; |
| 594 | int error = 0; |
| 595 | struct addrinfo ai; |
| 596 | struct addrinfo ai0; |
| 597 | struct addrinfo *pai; |
| 598 | const struct explore *ex; |
| 599 | |
| 600 | /* hostname is allowed to be NULL */ |
| 601 | /* servname is allowed to be NULL */ |
| 602 | /* hints is allowed to be NULL */ |
| 603 | assert(res != NULL); |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 604 | assert(netcontext != NULL); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 605 | memset(&sentinel, 0, sizeof(sentinel)); |
| 606 | cur = &sentinel; |
| 607 | pai = &ai; |
| 608 | pai->ai_flags = 0; |
| 609 | pai->ai_family = PF_UNSPEC; |
| 610 | pai->ai_socktype = ANY; |
| 611 | pai->ai_protocol = ANY; |
| 612 | pai->ai_addrlen = 0; |
| 613 | pai->ai_canonname = NULL; |
| 614 | pai->ai_addr = NULL; |
| 615 | pai->ai_next = NULL; |
| 616 | |
| 617 | if (hostname == NULL && servname == NULL) |
| 618 | return EAI_NONAME; |
| 619 | if (hints) { |
| 620 | /* error check for hints */ |
| 621 | if (hints->ai_addrlen || hints->ai_canonname || |
| 622 | hints->ai_addr || hints->ai_next) |
| 623 | ERR(EAI_BADHINTS); /* xxx */ |
| 624 | if (hints->ai_flags & ~AI_MASK) |
| 625 | ERR(EAI_BADFLAGS); |
| 626 | switch (hints->ai_family) { |
| 627 | case PF_UNSPEC: |
| 628 | case PF_INET: |
| 629 | #ifdef INET6 |
| 630 | case PF_INET6: |
| 631 | #endif |
| 632 | break; |
| 633 | default: |
| 634 | ERR(EAI_FAMILY); |
| 635 | } |
| 636 | memcpy(pai, hints, sizeof(*pai)); |
| 637 | |
| 638 | /* |
| 639 | * if both socktype/protocol are specified, check if they |
| 640 | * are meaningful combination. |
| 641 | */ |
| 642 | if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) { |
| 643 | for (ex = explore; ex->e_af >= 0; ex++) { |
| 644 | if (pai->ai_family != ex->e_af) |
| 645 | continue; |
| 646 | if (ex->e_socktype == ANY) |
| 647 | continue; |
| 648 | if (ex->e_protocol == ANY) |
| 649 | continue; |
| 650 | if (pai->ai_socktype == ex->e_socktype |
| 651 | && pai->ai_protocol != ex->e_protocol) { |
| 652 | ERR(EAI_BADHINTS); |
| 653 | } |
| 654 | } |
| 655 | } |
| 656 | } |
| 657 | |
| 658 | /* |
| 659 | * check for special cases. (1) numeric servname is disallowed if |
| 660 | * socktype/protocol are left unspecified. (2) servname is disallowed |
| 661 | * for raw and other inet{,6} sockets. |
| 662 | */ |
| 663 | if (MATCH_FAMILY(pai->ai_family, PF_INET, 1) |
| 664 | #ifdef PF_INET6 |
| 665 | || MATCH_FAMILY(pai->ai_family, PF_INET6, 1) |
| 666 | #endif |
| 667 | ) { |
| 668 | ai0 = *pai; /* backup *pai */ |
| 669 | |
| 670 | if (pai->ai_family == PF_UNSPEC) { |
| 671 | #ifdef PF_INET6 |
| 672 | pai->ai_family = PF_INET6; |
| 673 | #else |
| 674 | pai->ai_family = PF_INET; |
| 675 | #endif |
| 676 | } |
| 677 | error = get_portmatch(pai, servname); |
| 678 | if (error) |
| 679 | ERR(error); |
| 680 | |
| 681 | *pai = ai0; |
| 682 | } |
| 683 | |
| 684 | ai0 = *pai; |
| 685 | |
| 686 | /* NULL hostname, or numeric hostname */ |
| 687 | for (ex = explore; ex->e_af >= 0; ex++) { |
| 688 | *pai = ai0; |
| 689 | |
| 690 | /* PF_UNSPEC entries are prepared for DNS queries only */ |
| 691 | if (ex->e_af == PF_UNSPEC) |
| 692 | continue; |
| 693 | |
| 694 | if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex))) |
| 695 | continue; |
| 696 | if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex))) |
| 697 | continue; |
| 698 | if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex))) |
| 699 | continue; |
| 700 | |
| 701 | if (pai->ai_family == PF_UNSPEC) |
| 702 | pai->ai_family = ex->e_af; |
| 703 | if (pai->ai_socktype == ANY && ex->e_socktype != ANY) |
| 704 | pai->ai_socktype = ex->e_socktype; |
| 705 | if (pai->ai_protocol == ANY && ex->e_protocol != ANY) |
| 706 | pai->ai_protocol = ex->e_protocol; |
| 707 | |
| 708 | if (hostname == NULL) |
| 709 | error = explore_null(pai, servname, &cur->ai_next); |
| 710 | else |
| 711 | error = explore_numeric_scope(pai, hostname, servname, |
| 712 | &cur->ai_next); |
| 713 | |
| 714 | if (error) |
| 715 | goto free; |
| 716 | |
| 717 | while (cur->ai_next) |
| 718 | cur = cur->ai_next; |
| 719 | } |
| 720 | |
| 721 | /* |
| 722 | * XXX |
| 723 | * If numeric representation of AF1 can be interpreted as FQDN |
| 724 | * representation of AF2, we need to think again about the code below. |
| 725 | */ |
| 726 | if (sentinel.ai_next) |
| 727 | goto good; |
| 728 | |
| 729 | if (hostname == NULL) |
| 730 | ERR(EAI_NODATA); |
| 731 | if (pai->ai_flags & AI_NUMERICHOST) |
| 732 | ERR(EAI_NONAME); |
| 733 | |
Elliott Hughes | 9773fa3 | 2014-12-10 14:56:46 -0800 | [diff] [blame] | 734 | #if defined(__ANDROID__) |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 735 | int gai_error = android_getaddrinfo_proxy( |
| 736 | hostname, servname, hints, res, netcontext->app_netid); |
Elliott Hughes | 9773fa3 | 2014-12-10 14:56:46 -0800 | [diff] [blame] | 737 | if (gai_error != EAI_SYSTEM) { |
| 738 | return gai_error; |
Mattias Falk | c63e590 | 2011-08-23 14:34:14 +0200 | [diff] [blame] | 739 | } |
Elliott Hughes | 9773fa3 | 2014-12-10 14:56:46 -0800 | [diff] [blame] | 740 | #endif |
Brad Fitzpatrick | a1dbf0b | 2010-10-27 10:36:36 -0700 | [diff] [blame] | 741 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 742 | /* |
| 743 | * hostname as alphabetical name. |
| 744 | * we would like to prefer AF_INET6 than AF_INET, so we'll make a |
| 745 | * outer loop by AFs. |
| 746 | */ |
| 747 | for (ex = explore; ex->e_af >= 0; ex++) { |
| 748 | *pai = ai0; |
| 749 | |
| 750 | /* require exact match for family field */ |
| 751 | if (pai->ai_family != ex->e_af) |
| 752 | continue; |
| 753 | |
| 754 | if (!MATCH(pai->ai_socktype, ex->e_socktype, |
| 755 | WILD_SOCKTYPE(ex))) { |
| 756 | continue; |
| 757 | } |
| 758 | if (!MATCH(pai->ai_protocol, ex->e_protocol, |
| 759 | WILD_PROTOCOL(ex))) { |
| 760 | continue; |
| 761 | } |
| 762 | |
| 763 | if (pai->ai_socktype == ANY && ex->e_socktype != ANY) |
| 764 | pai->ai_socktype = ex->e_socktype; |
| 765 | if (pai->ai_protocol == ANY && ex->e_protocol != ANY) |
| 766 | pai->ai_protocol = ex->e_protocol; |
| 767 | |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 768 | error = explore_fqdn( |
| 769 | pai, hostname, servname, &cur->ai_next, netcontext); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 770 | |
| 771 | while (cur && cur->ai_next) |
| 772 | cur = cur->ai_next; |
| 773 | } |
| 774 | |
| 775 | /* XXX */ |
| 776 | if (sentinel.ai_next) |
| 777 | error = 0; |
| 778 | |
| 779 | if (error) |
| 780 | goto free; |
| 781 | if (error == 0) { |
| 782 | if (sentinel.ai_next) { |
| 783 | good: |
| 784 | *res = sentinel.ai_next; |
| 785 | return SUCCESS; |
| 786 | } else |
| 787 | error = EAI_FAIL; |
| 788 | } |
| 789 | free: |
| 790 | bad: |
| 791 | if (sentinel.ai_next) |
| 792 | freeaddrinfo(sentinel.ai_next); |
| 793 | *res = NULL; |
| 794 | return error; |
| 795 | } |
| 796 | |
| 797 | /* |
| 798 | * FQDN hostname, DNS lookup |
| 799 | */ |
| 800 | static int |
| 801 | explore_fqdn(const struct addrinfo *pai, const char *hostname, |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 802 | const char *servname, struct addrinfo **res, |
| 803 | const struct android_net_context *netcontext) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 804 | { |
| 805 | struct addrinfo *result; |
| 806 | struct addrinfo *cur; |
| 807 | int error = 0; |
| 808 | static const ns_dtab dtab[] = { |
| 809 | NS_FILES_CB(_files_getaddrinfo, NULL) |
| 810 | { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */ |
| 811 | NS_NIS_CB(_yp_getaddrinfo, NULL) |
| 812 | { 0, 0, 0 } |
| 813 | }; |
| 814 | |
| 815 | assert(pai != NULL); |
| 816 | /* hostname may be NULL */ |
| 817 | /* servname may be NULL */ |
| 818 | assert(res != NULL); |
| 819 | |
| 820 | result = NULL; |
| 821 | |
| 822 | /* |
| 823 | * if the servname does not match socktype/protocol, ignore it. |
| 824 | */ |
| 825 | if (get_portmatch(pai, servname) != 0) |
| 826 | return 0; |
| 827 | |
| 828 | switch (nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo", |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 829 | default_dns_files, hostname, pai, netcontext)) { |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 830 | case NS_TRYAGAIN: |
| 831 | error = EAI_AGAIN; |
| 832 | goto free; |
| 833 | case NS_UNAVAIL: |
| 834 | error = EAI_FAIL; |
| 835 | goto free; |
| 836 | case NS_NOTFOUND: |
| 837 | error = EAI_NODATA; |
| 838 | goto free; |
| 839 | case NS_SUCCESS: |
| 840 | error = 0; |
| 841 | for (cur = result; cur; cur = cur->ai_next) { |
| 842 | GET_PORT(cur, servname); |
| 843 | /* canonname should be filled already */ |
| 844 | } |
| 845 | break; |
| 846 | } |
| 847 | |
| 848 | *res = result; |
| 849 | |
| 850 | return 0; |
| 851 | |
| 852 | free: |
| 853 | if (result) |
| 854 | freeaddrinfo(result); |
| 855 | return error; |
| 856 | } |
| 857 | |
| 858 | /* |
| 859 | * hostname == NULL. |
| 860 | * passive socket -> anyaddr (0.0.0.0 or ::) |
| 861 | * non-passive socket -> localhost (127.0.0.1 or ::1) |
| 862 | */ |
| 863 | static int |
| 864 | explore_null(const struct addrinfo *pai, const char *servname, |
| 865 | struct addrinfo **res) |
| 866 | { |
| 867 | int s; |
| 868 | const struct afd *afd; |
| 869 | struct addrinfo *cur; |
| 870 | struct addrinfo sentinel; |
| 871 | int error; |
| 872 | |
| 873 | assert(pai != NULL); |
| 874 | /* servname may be NULL */ |
| 875 | assert(res != NULL); |
| 876 | |
| 877 | *res = NULL; |
| 878 | sentinel.ai_next = NULL; |
| 879 | cur = &sentinel; |
| 880 | |
| 881 | /* |
| 882 | * filter out AFs that are not supported by the kernel |
| 883 | * XXX errno? |
| 884 | */ |
Nick Kralevich | 1781ed7 | 2014-06-29 20:46:17 -0700 | [diff] [blame] | 885 | s = socket(pai->ai_family, SOCK_DGRAM | SOCK_CLOEXEC, 0); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 886 | if (s < 0) { |
| 887 | if (errno != EMFILE) |
| 888 | return 0; |
| 889 | } else |
| 890 | close(s); |
| 891 | |
| 892 | /* |
| 893 | * if the servname does not match socktype/protocol, ignore it. |
| 894 | */ |
| 895 | if (get_portmatch(pai, servname) != 0) |
| 896 | return 0; |
| 897 | |
| 898 | afd = find_afd(pai->ai_family); |
| 899 | if (afd == NULL) |
| 900 | return 0; |
| 901 | |
| 902 | if (pai->ai_flags & AI_PASSIVE) { |
| 903 | GET_AI(cur->ai_next, afd, afd->a_addrany); |
| 904 | /* xxx meaningless? |
| 905 | * GET_CANONNAME(cur->ai_next, "anyaddr"); |
| 906 | */ |
| 907 | GET_PORT(cur->ai_next, servname); |
| 908 | } else { |
| 909 | GET_AI(cur->ai_next, afd, afd->a_loopback); |
| 910 | /* xxx meaningless? |
| 911 | * GET_CANONNAME(cur->ai_next, "localhost"); |
| 912 | */ |
| 913 | GET_PORT(cur->ai_next, servname); |
| 914 | } |
| 915 | cur = cur->ai_next; |
| 916 | |
| 917 | *res = sentinel.ai_next; |
| 918 | return 0; |
| 919 | |
| 920 | free: |
| 921 | if (sentinel.ai_next) |
| 922 | freeaddrinfo(sentinel.ai_next); |
| 923 | return error; |
| 924 | } |
| 925 | |
| 926 | /* |
| 927 | * numeric hostname |
| 928 | */ |
| 929 | static int |
| 930 | explore_numeric(const struct addrinfo *pai, const char *hostname, |
| 931 | const char *servname, struct addrinfo **res, const char *canonname) |
| 932 | { |
| 933 | const struct afd *afd; |
| 934 | struct addrinfo *cur; |
| 935 | struct addrinfo sentinel; |
| 936 | int error; |
| 937 | char pton[PTON_MAX]; |
| 938 | |
| 939 | assert(pai != NULL); |
| 940 | /* hostname may be NULL */ |
| 941 | /* servname may be NULL */ |
| 942 | assert(res != NULL); |
| 943 | |
| 944 | *res = NULL; |
| 945 | sentinel.ai_next = NULL; |
| 946 | cur = &sentinel; |
| 947 | |
| 948 | /* |
| 949 | * if the servname does not match socktype/protocol, ignore it. |
| 950 | */ |
| 951 | if (get_portmatch(pai, servname) != 0) |
| 952 | return 0; |
| 953 | |
| 954 | afd = find_afd(pai->ai_family); |
| 955 | if (afd == NULL) |
| 956 | return 0; |
| 957 | |
| 958 | switch (afd->a_af) { |
| 959 | #if 0 /*X/Open spec*/ |
| 960 | case AF_INET: |
| 961 | if (inet_aton(hostname, (struct in_addr *)pton) == 1) { |
| 962 | if (pai->ai_family == afd->a_af || |
| 963 | pai->ai_family == PF_UNSPEC /*?*/) { |
| 964 | GET_AI(cur->ai_next, afd, pton); |
| 965 | GET_PORT(cur->ai_next, servname); |
| 966 | if ((pai->ai_flags & AI_CANONNAME)) { |
| 967 | /* |
| 968 | * Set the numeric address itself as |
| 969 | * the canonical name, based on a |
| 970 | * clarification in rfc2553bis-03. |
| 971 | */ |
| 972 | GET_CANONNAME(cur->ai_next, canonname); |
| 973 | } |
| 974 | while (cur && cur->ai_next) |
| 975 | cur = cur->ai_next; |
| 976 | } else |
| 977 | ERR(EAI_FAMILY); /*xxx*/ |
| 978 | } |
| 979 | break; |
| 980 | #endif |
| 981 | default: |
| 982 | if (inet_pton(afd->a_af, hostname, pton) == 1) { |
| 983 | if (pai->ai_family == afd->a_af || |
| 984 | pai->ai_family == PF_UNSPEC /*?*/) { |
| 985 | GET_AI(cur->ai_next, afd, pton); |
| 986 | GET_PORT(cur->ai_next, servname); |
| 987 | if ((pai->ai_flags & AI_CANONNAME)) { |
| 988 | /* |
| 989 | * Set the numeric address itself as |
| 990 | * the canonical name, based on a |
| 991 | * clarification in rfc2553bis-03. |
| 992 | */ |
| 993 | GET_CANONNAME(cur->ai_next, canonname); |
| 994 | } |
| 995 | while (cur->ai_next) |
| 996 | cur = cur->ai_next; |
| 997 | } else |
| 998 | ERR(EAI_FAMILY); /*xxx*/ |
| 999 | } |
| 1000 | break; |
| 1001 | } |
| 1002 | |
| 1003 | *res = sentinel.ai_next; |
| 1004 | return 0; |
| 1005 | |
| 1006 | free: |
| 1007 | bad: |
| 1008 | if (sentinel.ai_next) |
| 1009 | freeaddrinfo(sentinel.ai_next); |
| 1010 | return error; |
| 1011 | } |
| 1012 | |
| 1013 | /* |
| 1014 | * numeric hostname with scope |
| 1015 | */ |
| 1016 | static int |
| 1017 | explore_numeric_scope(const struct addrinfo *pai, const char *hostname, |
| 1018 | const char *servname, struct addrinfo **res) |
| 1019 | { |
| 1020 | #if !defined(SCOPE_DELIMITER) || !defined(INET6) |
| 1021 | return explore_numeric(pai, hostname, servname, res, hostname); |
| 1022 | #else |
| 1023 | const struct afd *afd; |
| 1024 | struct addrinfo *cur; |
| 1025 | int error; |
| 1026 | char *cp, *hostname2 = NULL, *scope, *addr; |
| 1027 | struct sockaddr_in6 *sin6; |
| 1028 | |
| 1029 | assert(pai != NULL); |
| 1030 | /* hostname may be NULL */ |
| 1031 | /* servname may be NULL */ |
| 1032 | assert(res != NULL); |
| 1033 | |
| 1034 | /* |
| 1035 | * if the servname does not match socktype/protocol, ignore it. |
| 1036 | */ |
| 1037 | if (get_portmatch(pai, servname) != 0) |
| 1038 | return 0; |
| 1039 | |
| 1040 | afd = find_afd(pai->ai_family); |
| 1041 | if (afd == NULL) |
| 1042 | return 0; |
| 1043 | |
| 1044 | if (!afd->a_scoped) |
| 1045 | return explore_numeric(pai, hostname, servname, res, hostname); |
| 1046 | |
| 1047 | cp = strchr(hostname, SCOPE_DELIMITER); |
| 1048 | if (cp == NULL) |
| 1049 | return explore_numeric(pai, hostname, servname, res, hostname); |
| 1050 | |
| 1051 | /* |
| 1052 | * Handle special case of <scoped_address><delimiter><scope id> |
| 1053 | */ |
| 1054 | hostname2 = strdup(hostname); |
| 1055 | if (hostname2 == NULL) |
| 1056 | return EAI_MEMORY; |
| 1057 | /* terminate at the delimiter */ |
| 1058 | hostname2[cp - hostname] = '\0'; |
| 1059 | addr = hostname2; |
| 1060 | scope = cp + 1; |
| 1061 | |
| 1062 | error = explore_numeric(pai, addr, servname, res, hostname); |
| 1063 | if (error == 0) { |
| 1064 | u_int32_t scopeid; |
| 1065 | |
| 1066 | for (cur = *res; cur; cur = cur->ai_next) { |
| 1067 | if (cur->ai_family != AF_INET6) |
| 1068 | continue; |
| 1069 | sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr; |
| 1070 | if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) { |
| 1071 | free(hostname2); |
| 1072 | return(EAI_NODATA); /* XXX: is return OK? */ |
| 1073 | } |
| 1074 | sin6->sin6_scope_id = scopeid; |
| 1075 | } |
| 1076 | } |
| 1077 | |
| 1078 | free(hostname2); |
| 1079 | |
| 1080 | return error; |
| 1081 | #endif |
| 1082 | } |
| 1083 | |
| 1084 | static int |
| 1085 | get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str) |
| 1086 | { |
| 1087 | |
| 1088 | assert(pai != NULL); |
| 1089 | assert(ai != NULL); |
| 1090 | assert(str != NULL); |
| 1091 | |
| 1092 | if ((pai->ai_flags & AI_CANONNAME) != 0) { |
| 1093 | ai->ai_canonname = strdup(str); |
| 1094 | if (ai->ai_canonname == NULL) |
| 1095 | return EAI_MEMORY; |
| 1096 | } |
| 1097 | return 0; |
| 1098 | } |
| 1099 | |
| 1100 | static struct addrinfo * |
| 1101 | get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr) |
| 1102 | { |
| 1103 | char *p; |
| 1104 | struct addrinfo *ai; |
| 1105 | |
| 1106 | assert(pai != NULL); |
| 1107 | assert(afd != NULL); |
| 1108 | assert(addr != NULL); |
| 1109 | |
| 1110 | ai = (struct addrinfo *)malloc(sizeof(struct addrinfo) |
| 1111 | + (afd->a_socklen)); |
| 1112 | if (ai == NULL) |
| 1113 | return NULL; |
| 1114 | |
| 1115 | memcpy(ai, pai, sizeof(struct addrinfo)); |
| 1116 | ai->ai_addr = (struct sockaddr *)(void *)(ai + 1); |
| 1117 | memset(ai->ai_addr, 0, (size_t)afd->a_socklen); |
| 1118 | |
| 1119 | #ifdef HAVE_SA_LEN |
| 1120 | ai->ai_addr->sa_len = afd->a_socklen; |
| 1121 | #endif |
| 1122 | |
| 1123 | ai->ai_addrlen = afd->a_socklen; |
| 1124 | #if defined (__alpha__) || (defined(__i386__) && defined(_LP64)) || defined(__sparc64__) |
| 1125 | ai->__ai_pad0 = 0; |
| 1126 | #endif |
| 1127 | ai->ai_addr->sa_family = ai->ai_family = afd->a_af; |
| 1128 | p = (char *)(void *)(ai->ai_addr); |
| 1129 | memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen); |
| 1130 | return ai; |
| 1131 | } |
| 1132 | |
| 1133 | static int |
| 1134 | get_portmatch(const struct addrinfo *ai, const char *servname) |
| 1135 | { |
| 1136 | |
| 1137 | assert(ai != NULL); |
| 1138 | /* servname may be NULL */ |
| 1139 | |
| 1140 | return get_port(ai, servname, 1); |
| 1141 | } |
| 1142 | |
| 1143 | static int |
| 1144 | get_port(const struct addrinfo *ai, const char *servname, int matchonly) |
| 1145 | { |
| 1146 | const char *proto; |
| 1147 | struct servent *sp; |
| 1148 | int port; |
| 1149 | int allownumeric; |
| 1150 | |
| 1151 | assert(ai != NULL); |
| 1152 | /* servname may be NULL */ |
| 1153 | |
| 1154 | if (servname == NULL) |
| 1155 | return 0; |
| 1156 | switch (ai->ai_family) { |
| 1157 | case AF_INET: |
| 1158 | #ifdef AF_INET6 |
| 1159 | case AF_INET6: |
| 1160 | #endif |
| 1161 | break; |
| 1162 | default: |
| 1163 | return 0; |
| 1164 | } |
| 1165 | |
| 1166 | switch (ai->ai_socktype) { |
| 1167 | case SOCK_RAW: |
| 1168 | return EAI_SERVICE; |
| 1169 | case SOCK_DGRAM: |
| 1170 | case SOCK_STREAM: |
| 1171 | allownumeric = 1; |
| 1172 | break; |
| 1173 | case ANY: |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1174 | #if 1 /* ANDROID-SPECIFIC CHANGE TO MATCH GLIBC */ |
David 'Digit' Turner | 5e56370 | 2009-05-05 15:50:24 +0200 | [diff] [blame] | 1175 | allownumeric = 1; |
| 1176 | #else |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1177 | allownumeric = 0; |
David 'Digit' Turner | 5e56370 | 2009-05-05 15:50:24 +0200 | [diff] [blame] | 1178 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1179 | break; |
| 1180 | default: |
| 1181 | return EAI_SOCKTYPE; |
| 1182 | } |
| 1183 | |
| 1184 | port = str2number(servname); |
| 1185 | if (port >= 0) { |
| 1186 | if (!allownumeric) |
| 1187 | return EAI_SERVICE; |
| 1188 | if (port < 0 || port > 65535) |
| 1189 | return EAI_SERVICE; |
| 1190 | port = htons(port); |
| 1191 | } else { |
| 1192 | if (ai->ai_flags & AI_NUMERICSERV) |
| 1193 | return EAI_NONAME; |
| 1194 | |
| 1195 | switch (ai->ai_socktype) { |
| 1196 | case SOCK_DGRAM: |
| 1197 | proto = "udp"; |
| 1198 | break; |
| 1199 | case SOCK_STREAM: |
| 1200 | proto = "tcp"; |
| 1201 | break; |
| 1202 | default: |
| 1203 | proto = NULL; |
| 1204 | break; |
| 1205 | } |
| 1206 | |
| 1207 | if ((sp = getservbyname(servname, proto)) == NULL) |
| 1208 | return EAI_SERVICE; |
| 1209 | port = sp->s_port; |
| 1210 | } |
| 1211 | |
| 1212 | if (!matchonly) { |
| 1213 | switch (ai->ai_family) { |
| 1214 | case AF_INET: |
| 1215 | ((struct sockaddr_in *)(void *) |
| 1216 | ai->ai_addr)->sin_port = port; |
| 1217 | break; |
| 1218 | #ifdef INET6 |
| 1219 | case AF_INET6: |
| 1220 | ((struct sockaddr_in6 *)(void *) |
| 1221 | ai->ai_addr)->sin6_port = port; |
| 1222 | break; |
| 1223 | #endif |
| 1224 | } |
| 1225 | } |
| 1226 | |
| 1227 | return 0; |
| 1228 | } |
| 1229 | |
| 1230 | static const struct afd * |
| 1231 | find_afd(int af) |
| 1232 | { |
| 1233 | const struct afd *afd; |
| 1234 | |
| 1235 | if (af == PF_UNSPEC) |
| 1236 | return NULL; |
| 1237 | for (afd = afdl; afd->a_af; afd++) { |
| 1238 | if (afd->a_af == af) |
| 1239 | return afd; |
| 1240 | } |
| 1241 | return NULL; |
| 1242 | } |
| 1243 | |
| 1244 | #ifdef INET6 |
| 1245 | /* convert a string to a scope identifier. XXX: IPv6 specific */ |
| 1246 | static int |
| 1247 | ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid) |
| 1248 | { |
| 1249 | u_long lscopeid; |
| 1250 | struct in6_addr *a6; |
| 1251 | char *ep; |
| 1252 | |
| 1253 | assert(scope != NULL); |
| 1254 | assert(sin6 != NULL); |
| 1255 | assert(scopeid != NULL); |
| 1256 | |
| 1257 | a6 = &sin6->sin6_addr; |
| 1258 | |
| 1259 | /* empty scopeid portion is invalid */ |
| 1260 | if (*scope == '\0') |
| 1261 | return -1; |
| 1262 | |
| 1263 | if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) { |
| 1264 | /* |
| 1265 | * We currently assume a one-to-one mapping between links |
| 1266 | * and interfaces, so we simply use interface indices for |
| 1267 | * like-local scopes. |
| 1268 | */ |
| 1269 | *scopeid = if_nametoindex(scope); |
| 1270 | if (*scopeid == 0) |
| 1271 | goto trynumeric; |
| 1272 | return 0; |
| 1273 | } |
| 1274 | |
| 1275 | /* still unclear about literal, allow numeric only - placeholder */ |
| 1276 | if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6)) |
| 1277 | goto trynumeric; |
| 1278 | if (IN6_IS_ADDR_MC_ORGLOCAL(a6)) |
| 1279 | goto trynumeric; |
| 1280 | else |
| 1281 | goto trynumeric; /* global */ |
| 1282 | |
| 1283 | /* try to convert to a numeric id as a last resort */ |
| 1284 | trynumeric: |
| 1285 | errno = 0; |
| 1286 | lscopeid = strtoul(scope, &ep, 10); |
| 1287 | *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL); |
| 1288 | if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid) |
| 1289 | return 0; |
| 1290 | else |
| 1291 | return -1; |
| 1292 | } |
| 1293 | #endif |
| 1294 | |
| 1295 | /* code duplicate with gethnamaddr.c */ |
| 1296 | |
| 1297 | static const char AskedForGot[] = |
| 1298 | "gethostby*.getanswer: asked for \"%s\", got \"%s\""; |
| 1299 | |
Elliott Hughes | 87c0dba | 2016-11-14 13:56:32 -0800 | [diff] [blame] | 1300 | #define BOUNDED_INCR(x) \ |
| 1301 | do { \ |
| 1302 | BOUNDS_CHECK(cp, x); \ |
| 1303 | cp += (x); \ |
| 1304 | } while (/*CONSTCOND*/0) |
| 1305 | |
| 1306 | #define BOUNDS_CHECK(ptr, count) \ |
| 1307 | do { \ |
| 1308 | if (eom - (ptr) < (count)) { h_errno = NO_RECOVERY; return NULL; } \ |
| 1309 | } while (/*CONSTCOND*/0) |
| 1310 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1311 | static struct addrinfo * |
| 1312 | getanswer(const querybuf *answer, int anslen, const char *qname, int qtype, |
| 1313 | const struct addrinfo *pai) |
| 1314 | { |
| 1315 | struct addrinfo sentinel, *cur; |
| 1316 | struct addrinfo ai; |
| 1317 | const struct afd *afd; |
| 1318 | char *canonname; |
| 1319 | const HEADER *hp; |
| 1320 | const u_char *cp; |
| 1321 | int n; |
| 1322 | const u_char *eom; |
| 1323 | char *bp, *ep; |
| 1324 | int type, class, ancount, qdcount; |
| 1325 | int haveanswer, had_error; |
| 1326 | char tbuf[MAXDNAME]; |
| 1327 | int (*name_ok) (const char *); |
| 1328 | char hostbuf[8*1024]; |
| 1329 | |
| 1330 | assert(answer != NULL); |
| 1331 | assert(qname != NULL); |
| 1332 | assert(pai != NULL); |
| 1333 | |
| 1334 | memset(&sentinel, 0, sizeof(sentinel)); |
| 1335 | cur = &sentinel; |
| 1336 | |
| 1337 | canonname = NULL; |
| 1338 | eom = answer->buf + anslen; |
| 1339 | switch (qtype) { |
| 1340 | case T_A: |
| 1341 | case T_AAAA: |
| 1342 | case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/ |
| 1343 | name_ok = res_hnok; |
| 1344 | break; |
| 1345 | default: |
| 1346 | return NULL; /* XXX should be abort(); */ |
| 1347 | } |
| 1348 | /* |
| 1349 | * find first satisfactory answer |
| 1350 | */ |
| 1351 | hp = &answer->hdr; |
| 1352 | ancount = ntohs(hp->ancount); |
| 1353 | qdcount = ntohs(hp->qdcount); |
| 1354 | bp = hostbuf; |
| 1355 | ep = hostbuf + sizeof hostbuf; |
Elliott Hughes | 87c0dba | 2016-11-14 13:56:32 -0800 | [diff] [blame] | 1356 | cp = answer->buf; |
| 1357 | BOUNDED_INCR(HFIXEDSZ); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1358 | if (qdcount != 1) { |
| 1359 | h_errno = NO_RECOVERY; |
| 1360 | return (NULL); |
| 1361 | } |
| 1362 | n = dn_expand(answer->buf, eom, cp, bp, ep - bp); |
| 1363 | if ((n < 0) || !(*name_ok)(bp)) { |
| 1364 | h_errno = NO_RECOVERY; |
| 1365 | return (NULL); |
| 1366 | } |
Elliott Hughes | 87c0dba | 2016-11-14 13:56:32 -0800 | [diff] [blame] | 1367 | BOUNDED_INCR(n + QFIXEDSZ); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1368 | if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) { |
| 1369 | /* res_send() has already verified that the query name is the |
| 1370 | * same as the one we sent; this just gets the expanded name |
| 1371 | * (i.e., with the succeeding search-domain tacked on). |
| 1372 | */ |
| 1373 | n = strlen(bp) + 1; /* for the \0 */ |
| 1374 | if (n >= MAXHOSTNAMELEN) { |
| 1375 | h_errno = NO_RECOVERY; |
| 1376 | return (NULL); |
| 1377 | } |
| 1378 | canonname = bp; |
| 1379 | bp += n; |
| 1380 | /* The qname can be abbreviated, but h_name is now absolute. */ |
| 1381 | qname = canonname; |
| 1382 | } |
| 1383 | haveanswer = 0; |
| 1384 | had_error = 0; |
| 1385 | while (ancount-- > 0 && cp < eom && !had_error) { |
| 1386 | n = dn_expand(answer->buf, eom, cp, bp, ep - bp); |
| 1387 | if ((n < 0) || !(*name_ok)(bp)) { |
| 1388 | had_error++; |
| 1389 | continue; |
| 1390 | } |
| 1391 | cp += n; /* name */ |
Elliott Hughes | 87c0dba | 2016-11-14 13:56:32 -0800 | [diff] [blame] | 1392 | BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1393 | type = _getshort(cp); |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 1394 | cp += INT16SZ; /* type */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1395 | class = _getshort(cp); |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 1396 | cp += INT16SZ + INT32SZ; /* class, TTL */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1397 | n = _getshort(cp); |
| 1398 | cp += INT16SZ; /* len */ |
Elliott Hughes | 87c0dba | 2016-11-14 13:56:32 -0800 | [diff] [blame] | 1399 | BOUNDS_CHECK(cp, n); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1400 | if (class != C_IN) { |
| 1401 | /* XXX - debug? syslog? */ |
| 1402 | cp += n; |
| 1403 | continue; /* XXX - had_error++ ? */ |
| 1404 | } |
| 1405 | if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) && |
| 1406 | type == T_CNAME) { |
| 1407 | n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); |
| 1408 | if ((n < 0) || !(*name_ok)(tbuf)) { |
| 1409 | had_error++; |
| 1410 | continue; |
| 1411 | } |
| 1412 | cp += n; |
| 1413 | /* Get canonical name. */ |
| 1414 | n = strlen(tbuf) + 1; /* for the \0 */ |
| 1415 | if (n > ep - bp || n >= MAXHOSTNAMELEN) { |
| 1416 | had_error++; |
| 1417 | continue; |
| 1418 | } |
| 1419 | strlcpy(bp, tbuf, (size_t)(ep - bp)); |
| 1420 | canonname = bp; |
| 1421 | bp += n; |
| 1422 | continue; |
| 1423 | } |
| 1424 | if (qtype == T_ANY) { |
| 1425 | if (!(type == T_A || type == T_AAAA)) { |
| 1426 | cp += n; |
| 1427 | continue; |
| 1428 | } |
| 1429 | } else if (type != qtype) { |
| 1430 | if (type != T_KEY && type != T_SIG) |
| 1431 | syslog(LOG_NOTICE|LOG_AUTH, |
| 1432 | "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", |
| 1433 | qname, p_class(C_IN), p_type(qtype), |
| 1434 | p_type(type)); |
| 1435 | cp += n; |
| 1436 | continue; /* XXX - had_error++ ? */ |
| 1437 | } |
| 1438 | switch (type) { |
| 1439 | case T_A: |
| 1440 | case T_AAAA: |
| 1441 | if (strcasecmp(canonname, bp) != 0) { |
| 1442 | syslog(LOG_NOTICE|LOG_AUTH, |
| 1443 | AskedForGot, canonname, bp); |
| 1444 | cp += n; |
| 1445 | continue; /* XXX - had_error++ ? */ |
| 1446 | } |
| 1447 | if (type == T_A && n != INADDRSZ) { |
| 1448 | cp += n; |
| 1449 | continue; |
| 1450 | } |
| 1451 | if (type == T_AAAA && n != IN6ADDRSZ) { |
| 1452 | cp += n; |
| 1453 | continue; |
| 1454 | } |
| 1455 | if (type == T_AAAA) { |
| 1456 | struct in6_addr in6; |
| 1457 | memcpy(&in6, cp, IN6ADDRSZ); |
| 1458 | if (IN6_IS_ADDR_V4MAPPED(&in6)) { |
| 1459 | cp += n; |
| 1460 | continue; |
| 1461 | } |
| 1462 | } |
| 1463 | if (!haveanswer) { |
| 1464 | int nn; |
| 1465 | |
| 1466 | canonname = bp; |
| 1467 | nn = strlen(bp) + 1; /* for the \0 */ |
| 1468 | bp += nn; |
| 1469 | } |
| 1470 | |
| 1471 | /* don't overwrite pai */ |
| 1472 | ai = *pai; |
| 1473 | ai.ai_family = (type == T_A) ? AF_INET : AF_INET6; |
| 1474 | afd = find_afd(ai.ai_family); |
| 1475 | if (afd == NULL) { |
| 1476 | cp += n; |
| 1477 | continue; |
| 1478 | } |
| 1479 | cur->ai_next = get_ai(&ai, afd, (const char *)cp); |
| 1480 | if (cur->ai_next == NULL) |
| 1481 | had_error++; |
| 1482 | while (cur && cur->ai_next) |
| 1483 | cur = cur->ai_next; |
| 1484 | cp += n; |
| 1485 | break; |
| 1486 | default: |
| 1487 | abort(); |
| 1488 | } |
| 1489 | if (!had_error) |
| 1490 | haveanswer++; |
| 1491 | } |
| 1492 | if (haveanswer) { |
| 1493 | if (!canonname) |
| 1494 | (void)get_canonname(pai, sentinel.ai_next, qname); |
| 1495 | else |
| 1496 | (void)get_canonname(pai, sentinel.ai_next, canonname); |
| 1497 | h_errno = NETDB_SUCCESS; |
| 1498 | return sentinel.ai_next; |
| 1499 | } |
| 1500 | |
| 1501 | h_errno = NO_RECOVERY; |
| 1502 | return NULL; |
| 1503 | } |
| 1504 | |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1505 | struct addrinfo_sort_elem { |
| 1506 | struct addrinfo *ai; |
| 1507 | int has_src_addr; |
David 'Digit' Turner | 50ace4f | 2010-06-16 16:36:41 -0700 | [diff] [blame] | 1508 | sockaddr_union src_addr; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1509 | int original_order; |
| 1510 | }; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1511 | |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1512 | /*ARGSUSED*/ |
| 1513 | static int |
| 1514 | _get_scope(const struct sockaddr *addr) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1515 | { |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1516 | if (addr->sa_family == AF_INET6) { |
| 1517 | const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6 *)addr; |
| 1518 | if (IN6_IS_ADDR_MULTICAST(&addr6->sin6_addr)) { |
| 1519 | return IPV6_ADDR_MC_SCOPE(&addr6->sin6_addr); |
| 1520 | } else if (IN6_IS_ADDR_LOOPBACK(&addr6->sin6_addr) || |
| 1521 | IN6_IS_ADDR_LINKLOCAL(&addr6->sin6_addr)) { |
| 1522 | /* |
| 1523 | * RFC 4291 section 2.5.3 says loopback is to be treated as having |
| 1524 | * link-local scope. |
| 1525 | */ |
| 1526 | return IPV6_ADDR_SCOPE_LINKLOCAL; |
| 1527 | } else if (IN6_IS_ADDR_SITELOCAL(&addr6->sin6_addr)) { |
| 1528 | return IPV6_ADDR_SCOPE_SITELOCAL; |
| 1529 | } else { |
| 1530 | return IPV6_ADDR_SCOPE_GLOBAL; |
| 1531 | } |
| 1532 | } else if (addr->sa_family == AF_INET) { |
| 1533 | const struct sockaddr_in *addr4 = (const struct sockaddr_in *)addr; |
| 1534 | unsigned long int na = ntohl(addr4->sin_addr.s_addr); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1535 | |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1536 | if (IN_LOOPBACK(na) || /* 127.0.0.0/8 */ |
| 1537 | (na & 0xffff0000) == 0xa9fe0000) { /* 169.254.0.0/16 */ |
| 1538 | return IPV6_ADDR_SCOPE_LINKLOCAL; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1539 | } else { |
Steinar H. Gunderson | d1624ad | 2010-12-20 11:15:33 +0100 | [diff] [blame] | 1540 | /* |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1541 | * RFC 6724 section 3.2. Other IPv4 addresses, including private addresses |
| 1542 | * and shared addresses (100.64.0.0/10), are assigned global scope. |
Steinar H. Gunderson | d1624ad | 2010-12-20 11:15:33 +0100 | [diff] [blame] | 1543 | */ |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1544 | return IPV6_ADDR_SCOPE_GLOBAL; |
| 1545 | } |
| 1546 | } else { |
| 1547 | /* |
| 1548 | * This should never happen. |
| 1549 | * Return a scope with low priority as a last resort. |
| 1550 | */ |
| 1551 | return IPV6_ADDR_SCOPE_NODELOCAL; |
| 1552 | } |
| 1553 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1554 | |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1555 | /* These macros are modelled after the ones in <netinet/in6.h>. */ |
| 1556 | |
| 1557 | /* RFC 4380, section 2.6 */ |
| 1558 | #define IN6_IS_ADDR_TEREDO(a) \ |
| 1559 | ((*(const uint32_t *)(const void *)(&(a)->s6_addr[0]) == ntohl(0x20010000))) |
| 1560 | |
| 1561 | /* RFC 3056, section 2. */ |
| 1562 | #define IN6_IS_ADDR_6TO4(a) \ |
| 1563 | (((a)->s6_addr[0] == 0x20) && ((a)->s6_addr[1] == 0x02)) |
| 1564 | |
Steinar H. Gunderson | 2e23e29 | 2010-12-20 11:48:07 +0100 | [diff] [blame] | 1565 | /* 6bone testing address area (3ffe::/16), deprecated in RFC 3701. */ |
| 1566 | #define IN6_IS_ADDR_6BONE(a) \ |
| 1567 | (((a)->s6_addr[0] == 0x3f) && ((a)->s6_addr[1] == 0xfe)) |
| 1568 | |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1569 | /* |
| 1570 | * Get the label for a given IPv4/IPv6 address. |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1571 | * RFC 6724, section 2.1. |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1572 | */ |
| 1573 | |
| 1574 | /*ARGSUSED*/ |
| 1575 | static int |
| 1576 | _get_label(const struct sockaddr *addr) |
| 1577 | { |
| 1578 | if (addr->sa_family == AF_INET) { |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1579 | return 4; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1580 | } else if (addr->sa_family == AF_INET6) { |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1581 | const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6 *) addr; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1582 | if (IN6_IS_ADDR_LOOPBACK(&addr6->sin6_addr)) { |
| 1583 | return 0; |
Steinar H. Gunderson | 2e23e29 | 2010-12-20 11:48:07 +0100 | [diff] [blame] | 1584 | } else if (IN6_IS_ADDR_V4MAPPED(&addr6->sin6_addr)) { |
Steinar H. Gunderson | 2e23e29 | 2010-12-20 11:48:07 +0100 | [diff] [blame] | 1585 | return 4; |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1586 | } else if (IN6_IS_ADDR_6TO4(&addr6->sin6_addr)) { |
| 1587 | return 2; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1588 | } else if (IN6_IS_ADDR_TEREDO(&addr6->sin6_addr)) { |
| 1589 | return 5; |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1590 | } else if (IN6_IS_ADDR_ULA(&addr6->sin6_addr)) { |
| 1591 | return 13; |
Steinar H. Gunderson | 2e23e29 | 2010-12-20 11:48:07 +0100 | [diff] [blame] | 1592 | } else if (IN6_IS_ADDR_V4COMPAT(&addr6->sin6_addr)) { |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1593 | return 3; |
Steinar H. Gunderson | 2e23e29 | 2010-12-20 11:48:07 +0100 | [diff] [blame] | 1594 | } else if (IN6_IS_ADDR_SITELOCAL(&addr6->sin6_addr)) { |
| 1595 | return 11; |
| 1596 | } else if (IN6_IS_ADDR_6BONE(&addr6->sin6_addr)) { |
| 1597 | return 12; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1598 | } else { |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1599 | /* All other IPv6 addresses, including global unicast addresses. */ |
| 1600 | return 1; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1601 | } |
| 1602 | } else { |
| 1603 | /* |
| 1604 | * This should never happen. |
| 1605 | * Return a semi-random label as a last resort. |
| 1606 | */ |
| 1607 | return 1; |
| 1608 | } |
| 1609 | } |
| 1610 | |
| 1611 | /* |
| 1612 | * Get the precedence for a given IPv4/IPv6 address. |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1613 | * RFC 6724, section 2.1. |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1614 | */ |
| 1615 | |
| 1616 | /*ARGSUSED*/ |
| 1617 | static int |
| 1618 | _get_precedence(const struct sockaddr *addr) |
| 1619 | { |
| 1620 | if (addr->sa_family == AF_INET) { |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1621 | return 35; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1622 | } else if (addr->sa_family == AF_INET6) { |
| 1623 | const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6 *)addr; |
| 1624 | if (IN6_IS_ADDR_LOOPBACK(&addr6->sin6_addr)) { |
| 1625 | return 50; |
Steinar H. Gunderson | 2e23e29 | 2010-12-20 11:48:07 +0100 | [diff] [blame] | 1626 | } else if (IN6_IS_ADDR_V4MAPPED(&addr6->sin6_addr)) { |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1627 | return 35; |
Steinar H. Gunderson | 2e23e29 | 2010-12-20 11:48:07 +0100 | [diff] [blame] | 1628 | } else if (IN6_IS_ADDR_6TO4(&addr6->sin6_addr)) { |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1629 | return 30; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1630 | } else if (IN6_IS_ADDR_TEREDO(&addr6->sin6_addr)) { |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1631 | return 5; |
| 1632 | } else if (IN6_IS_ADDR_ULA(&addr6->sin6_addr)) { |
| 1633 | return 3; |
Steinar H. Gunderson | 2e23e29 | 2010-12-20 11:48:07 +0100 | [diff] [blame] | 1634 | } else if (IN6_IS_ADDR_V4COMPAT(&addr6->sin6_addr) || |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 1635 | IN6_IS_ADDR_SITELOCAL(&addr6->sin6_addr) || |
| 1636 | IN6_IS_ADDR_6BONE(&addr6->sin6_addr)) { |
Steinar H. Gunderson | 2e23e29 | 2010-12-20 11:48:07 +0100 | [diff] [blame] | 1637 | return 1; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1638 | } else { |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1639 | /* All other IPv6 addresses, including global unicast addresses. */ |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1640 | return 40; |
| 1641 | } |
| 1642 | } else { |
Steinar H. Gunderson | 2e23e29 | 2010-12-20 11:48:07 +0100 | [diff] [blame] | 1643 | return 1; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1644 | } |
| 1645 | } |
| 1646 | |
| 1647 | /* |
| 1648 | * Find number of matching initial bits between the two addresses a1 and a2. |
| 1649 | */ |
| 1650 | |
| 1651 | /*ARGSUSED*/ |
| 1652 | static int |
| 1653 | _common_prefix_len(const struct in6_addr *a1, const struct in6_addr *a2) |
| 1654 | { |
| 1655 | const char *p1 = (const char *)a1; |
| 1656 | const char *p2 = (const char *)a2; |
| 1657 | unsigned i; |
| 1658 | |
| 1659 | for (i = 0; i < sizeof(*a1); ++i) { |
| 1660 | int x, j; |
| 1661 | |
| 1662 | if (p1[i] == p2[i]) { |
| 1663 | continue; |
| 1664 | } |
| 1665 | x = p1[i] ^ p2[i]; |
| 1666 | for (j = 0; j < CHAR_BIT; ++j) { |
| 1667 | if (x & (1 << (CHAR_BIT - 1))) { |
| 1668 | return i * CHAR_BIT + j; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1669 | } |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1670 | x <<= 1; |
| 1671 | } |
| 1672 | } |
| 1673 | return sizeof(*a1) * CHAR_BIT; |
| 1674 | } |
| 1675 | |
| 1676 | /* |
| 1677 | * Compare two source/destination address pairs. |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1678 | * RFC 6724, section 6. |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1679 | */ |
| 1680 | |
| 1681 | /*ARGSUSED*/ |
| 1682 | static int |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1683 | _rfc6724_compare(const void *ptr1, const void* ptr2) |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1684 | { |
| 1685 | const struct addrinfo_sort_elem *a1 = (const struct addrinfo_sort_elem *)ptr1; |
| 1686 | const struct addrinfo_sort_elem *a2 = (const struct addrinfo_sort_elem *)ptr2; |
| 1687 | int scope_src1, scope_dst1, scope_match1; |
| 1688 | int scope_src2, scope_dst2, scope_match2; |
| 1689 | int label_src1, label_dst1, label_match1; |
| 1690 | int label_src2, label_dst2, label_match2; |
| 1691 | int precedence1, precedence2; |
| 1692 | int prefixlen1, prefixlen2; |
| 1693 | |
| 1694 | /* Rule 1: Avoid unusable destinations. */ |
| 1695 | if (a1->has_src_addr != a2->has_src_addr) { |
| 1696 | return a2->has_src_addr - a1->has_src_addr; |
| 1697 | } |
| 1698 | |
| 1699 | /* Rule 2: Prefer matching scope. */ |
David 'Digit' Turner | 50ace4f | 2010-06-16 16:36:41 -0700 | [diff] [blame] | 1700 | scope_src1 = _get_scope(&a1->src_addr.generic); |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1701 | scope_dst1 = _get_scope(a1->ai->ai_addr); |
| 1702 | scope_match1 = (scope_src1 == scope_dst1); |
| 1703 | |
David 'Digit' Turner | 50ace4f | 2010-06-16 16:36:41 -0700 | [diff] [blame] | 1704 | scope_src2 = _get_scope(&a2->src_addr.generic); |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1705 | scope_dst2 = _get_scope(a2->ai->ai_addr); |
| 1706 | scope_match2 = (scope_src2 == scope_dst2); |
| 1707 | |
| 1708 | if (scope_match1 != scope_match2) { |
| 1709 | return scope_match2 - scope_match1; |
| 1710 | } |
| 1711 | |
| 1712 | /* |
| 1713 | * Rule 3: Avoid deprecated addresses. |
| 1714 | * TODO(sesse): We don't currently have a good way of finding this. |
| 1715 | */ |
| 1716 | |
| 1717 | /* |
| 1718 | * Rule 4: Prefer home addresses. |
| 1719 | * TODO(sesse): We don't currently have a good way of finding this. |
| 1720 | */ |
| 1721 | |
| 1722 | /* Rule 5: Prefer matching label. */ |
David 'Digit' Turner | 50ace4f | 2010-06-16 16:36:41 -0700 | [diff] [blame] | 1723 | label_src1 = _get_label(&a1->src_addr.generic); |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1724 | label_dst1 = _get_label(a1->ai->ai_addr); |
| 1725 | label_match1 = (label_src1 == label_dst1); |
| 1726 | |
David 'Digit' Turner | 50ace4f | 2010-06-16 16:36:41 -0700 | [diff] [blame] | 1727 | label_src2 = _get_label(&a2->src_addr.generic); |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1728 | label_dst2 = _get_label(a2->ai->ai_addr); |
| 1729 | label_match2 = (label_src2 == label_dst2); |
| 1730 | |
| 1731 | if (label_match1 != label_match2) { |
| 1732 | return label_match2 - label_match1; |
| 1733 | } |
| 1734 | |
| 1735 | /* Rule 6: Prefer higher precedence. */ |
| 1736 | precedence1 = _get_precedence(a1->ai->ai_addr); |
| 1737 | precedence2 = _get_precedence(a2->ai->ai_addr); |
| 1738 | if (precedence1 != precedence2) { |
| 1739 | return precedence2 - precedence1; |
| 1740 | } |
| 1741 | |
| 1742 | /* |
| 1743 | * Rule 7: Prefer native transport. |
| 1744 | * TODO(sesse): We don't currently have a good way of finding this. |
| 1745 | */ |
| 1746 | |
| 1747 | /* Rule 8: Prefer smaller scope. */ |
| 1748 | if (scope_dst1 != scope_dst2) { |
| 1749 | return scope_dst1 - scope_dst2; |
| 1750 | } |
| 1751 | |
| 1752 | /* |
| 1753 | * Rule 9: Use longest matching prefix. |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1754 | * We implement this for IPv6 only, as the rules in RFC 6724 don't seem |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1755 | * to work very well directly applied to IPv4. (glibc uses information from |
| 1756 | * the routing table for a custom IPv4 implementation here.) |
| 1757 | */ |
| 1758 | if (a1->has_src_addr && a1->ai->ai_addr->sa_family == AF_INET6 && |
| 1759 | a2->has_src_addr && a2->ai->ai_addr->sa_family == AF_INET6) { |
David 'Digit' Turner | 50ace4f | 2010-06-16 16:36:41 -0700 | [diff] [blame] | 1760 | const struct sockaddr_in6 *a1_src = &a1->src_addr.in6; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1761 | const struct sockaddr_in6 *a1_dst = (const struct sockaddr_in6 *)a1->ai->ai_addr; |
David 'Digit' Turner | 50ace4f | 2010-06-16 16:36:41 -0700 | [diff] [blame] | 1762 | const struct sockaddr_in6 *a2_src = &a2->src_addr.in6; |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1763 | const struct sockaddr_in6 *a2_dst = (const struct sockaddr_in6 *)a2->ai->ai_addr; |
| 1764 | prefixlen1 = _common_prefix_len(&a1_src->sin6_addr, &a1_dst->sin6_addr); |
Kenny Root | 7e0bfb5 | 2010-03-24 18:06:20 -0700 | [diff] [blame] | 1765 | prefixlen2 = _common_prefix_len(&a2_src->sin6_addr, &a2_dst->sin6_addr); |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1766 | if (prefixlen1 != prefixlen2) { |
| 1767 | return prefixlen2 - prefixlen1; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1768 | } |
| 1769 | } |
| 1770 | |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1771 | /* |
| 1772 | * Rule 10: Leave the order unchanged. |
| 1773 | * We need this since qsort() is not necessarily stable. |
| 1774 | */ |
| 1775 | return a1->original_order - a2->original_order; |
| 1776 | } |
| 1777 | |
| 1778 | /* |
| 1779 | * Find the source address that will be used if trying to connect to the given |
| 1780 | * address. src_addr must be large enough to hold a struct sockaddr_in6. |
| 1781 | * |
| 1782 | * Returns 1 if a source address was found, 0 if the address is unreachable, |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 1783 | * and -1 if a fatal error occurred. If 0 or -1, the contents of src_addr are |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1784 | * undefined. |
| 1785 | */ |
| 1786 | |
| 1787 | /*ARGSUSED*/ |
| 1788 | static int |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 1789 | _find_src_addr(const struct sockaddr *addr, struct sockaddr *src_addr, unsigned mark, uid_t uid) |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1790 | { |
| 1791 | int sock; |
| 1792 | int ret; |
| 1793 | socklen_t len; |
| 1794 | |
| 1795 | switch (addr->sa_family) { |
| 1796 | case AF_INET: |
| 1797 | len = sizeof(struct sockaddr_in); |
| 1798 | break; |
| 1799 | case AF_INET6: |
| 1800 | len = sizeof(struct sockaddr_in6); |
| 1801 | break; |
| 1802 | default: |
| 1803 | /* No known usable source address for non-INET families. */ |
| 1804 | return 0; |
| 1805 | } |
| 1806 | |
Nick Kralevich | 1781ed7 | 2014-06-29 20:46:17 -0700 | [diff] [blame] | 1807 | sock = socket(addr->sa_family, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP); |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1808 | if (sock == -1) { |
| 1809 | if (errno == EAFNOSUPPORT) { |
| 1810 | return 0; |
| 1811 | } else { |
| 1812 | return -1; |
| 1813 | } |
| 1814 | } |
Erik Kline | 7bbb181 | 2016-03-04 17:16:55 +0900 | [diff] [blame] | 1815 | if (mark != MARK_UNSET && setsockopt(sock, SOL_SOCKET, SO_MARK, &mark, sizeof(mark)) < 0) { |
| 1816 | close(sock); |
Szymon Jakubczak | ea9bf67 | 2014-02-14 17:07:23 -0500 | [diff] [blame] | 1817 | return 0; |
Erik Kline | 7bbb181 | 2016-03-04 17:16:55 +0900 | [diff] [blame] | 1818 | } |
| 1819 | if (uid > 0 && uid != NET_CONTEXT_INVALID_UID && fchown(sock, uid, (gid_t)-1) < 0) { |
| 1820 | close(sock); |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 1821 | return 0; |
Erik Kline | 7bbb181 | 2016-03-04 17:16:55 +0900 | [diff] [blame] | 1822 | } |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1823 | do { |
Paul Jensen | 31ad037 | 2014-05-29 16:28:30 -0400 | [diff] [blame] | 1824 | ret = __connect(sock, addr, len); |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1825 | } while (ret == -1 && errno == EINTR); |
| 1826 | |
| 1827 | if (ret == -1) { |
| 1828 | close(sock); |
| 1829 | return 0; |
| 1830 | } |
| 1831 | |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 1832 | if (src_addr && getsockname(sock, src_addr, &len) == -1) { |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1833 | close(sock); |
| 1834 | return -1; |
| 1835 | } |
| 1836 | close(sock); |
| 1837 | return 1; |
| 1838 | } |
| 1839 | |
| 1840 | /* |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1841 | * Sort the linked list starting at sentinel->ai_next in RFC6724 order. |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1842 | * Will leave the list unchanged if an error occurs. |
| 1843 | */ |
| 1844 | |
| 1845 | /*ARGSUSED*/ |
| 1846 | static void |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 1847 | _rfc6724_sort(struct addrinfo *list_sentinel, unsigned mark, uid_t uid) |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1848 | { |
| 1849 | struct addrinfo *cur; |
| 1850 | int nelem = 0, i; |
| 1851 | struct addrinfo_sort_elem *elems; |
| 1852 | |
| 1853 | cur = list_sentinel->ai_next; |
| 1854 | while (cur) { |
| 1855 | ++nelem; |
| 1856 | cur = cur->ai_next; |
| 1857 | } |
| 1858 | |
| 1859 | elems = (struct addrinfo_sort_elem *)malloc(nelem * sizeof(struct addrinfo_sort_elem)); |
| 1860 | if (elems == NULL) { |
| 1861 | goto error; |
| 1862 | } |
| 1863 | |
| 1864 | /* |
| 1865 | * Convert the linked list to an array that also contains the candidate |
| 1866 | * source address for each destination address. |
| 1867 | */ |
| 1868 | for (i = 0, cur = list_sentinel->ai_next; i < nelem; ++i, cur = cur->ai_next) { |
| 1869 | int has_src_addr; |
| 1870 | assert(cur != NULL); |
| 1871 | elems[i].ai = cur; |
| 1872 | elems[i].original_order = i; |
| 1873 | |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 1874 | has_src_addr = _find_src_addr(cur->ai_addr, &elems[i].src_addr.generic, mark, uid); |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1875 | if (has_src_addr == -1) { |
| 1876 | goto error; |
| 1877 | } |
| 1878 | elems[i].has_src_addr = has_src_addr; |
| 1879 | } |
| 1880 | |
| 1881 | /* Sort the addresses, and rearrange the linked list so it matches the sorted order. */ |
Lorenzo Colitti | 378b0e1 | 2013-03-30 12:24:19 +0900 | [diff] [blame] | 1882 | qsort((void *)elems, nelem, sizeof(struct addrinfo_sort_elem), _rfc6724_compare); |
Steinar H. Gunderson | 9ab75d4 | 2010-02-11 15:44:55 +0100 | [diff] [blame] | 1883 | |
| 1884 | list_sentinel->ai_next = elems[0].ai; |
| 1885 | for (i = 0; i < nelem - 1; ++i) { |
| 1886 | elems[i].ai->ai_next = elems[i + 1].ai; |
| 1887 | } |
| 1888 | elems[nelem - 1].ai->ai_next = NULL; |
| 1889 | |
| 1890 | error: |
| 1891 | free(elems); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1892 | } |
| 1893 | |
| 1894 | /*ARGSUSED*/ |
| 1895 | static int |
| 1896 | _dns_getaddrinfo(void *rv, void *cb_data, va_list ap) |
| 1897 | { |
| 1898 | struct addrinfo *ai; |
| 1899 | querybuf *buf, *buf2; |
| 1900 | const char *name; |
| 1901 | const struct addrinfo *pai; |
| 1902 | struct addrinfo sentinel, *cur; |
| 1903 | struct res_target q, q2; |
| 1904 | res_state res; |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 1905 | const struct android_net_context *netcontext; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1906 | |
| 1907 | name = va_arg(ap, char *); |
| 1908 | pai = va_arg(ap, const struct addrinfo *); |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 1909 | netcontext = va_arg(ap, const struct android_net_context *); |
David 'Digit' Turner | 5e56370 | 2009-05-05 15:50:24 +0200 | [diff] [blame] | 1910 | //fprintf(stderr, "_dns_getaddrinfo() name = '%s'\n", name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1911 | |
| 1912 | memset(&q, 0, sizeof(q)); |
| 1913 | memset(&q2, 0, sizeof(q2)); |
| 1914 | memset(&sentinel, 0, sizeof(sentinel)); |
| 1915 | cur = &sentinel; |
| 1916 | |
| 1917 | buf = malloc(sizeof(*buf)); |
| 1918 | if (buf == NULL) { |
| 1919 | h_errno = NETDB_INTERNAL; |
| 1920 | return NS_NOTFOUND; |
| 1921 | } |
| 1922 | buf2 = malloc(sizeof(*buf2)); |
| 1923 | if (buf2 == NULL) { |
| 1924 | free(buf); |
| 1925 | h_errno = NETDB_INTERNAL; |
| 1926 | return NS_NOTFOUND; |
| 1927 | } |
| 1928 | |
| 1929 | switch (pai->ai_family) { |
| 1930 | case AF_UNSPEC: |
| 1931 | /* prefer IPv6 */ |
| 1932 | q.name = name; |
| 1933 | q.qclass = C_IN; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1934 | q.answer = buf->buf; |
| 1935 | q.anslen = sizeof(buf->buf); |
Lorenzo Colitti | ba96e30 | 2011-01-14 12:26:05 -0800 | [diff] [blame] | 1936 | int query_ipv6 = 1, query_ipv4 = 1; |
| 1937 | if (pai->ai_flags & AI_ADDRCONFIG) { |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 1938 | query_ipv6 = _have_ipv6(netcontext->app_mark, netcontext->uid); |
| 1939 | query_ipv4 = _have_ipv4(netcontext->app_mark, netcontext->uid); |
Lorenzo Colitti | ba96e30 | 2011-01-14 12:26:05 -0800 | [diff] [blame] | 1940 | } |
| 1941 | if (query_ipv6) { |
Lorenzo Colitti | 3d8f4ad | 2009-08-03 22:36:31 -0700 | [diff] [blame] | 1942 | q.qtype = T_AAAA; |
Lorenzo Colitti | ba96e30 | 2011-01-14 12:26:05 -0800 | [diff] [blame] | 1943 | if (query_ipv4) { |
| 1944 | q.next = &q2; |
| 1945 | q2.name = name; |
| 1946 | q2.qclass = C_IN; |
| 1947 | q2.qtype = T_A; |
| 1948 | q2.answer = buf2->buf; |
| 1949 | q2.anslen = sizeof(buf2->buf); |
| 1950 | } |
| 1951 | } else if (query_ipv4) { |
Lorenzo Colitti | 3d8f4ad | 2009-08-03 22:36:31 -0700 | [diff] [blame] | 1952 | q.qtype = T_A; |
Lorenzo Colitti | ba96e30 | 2011-01-14 12:26:05 -0800 | [diff] [blame] | 1953 | } else { |
| 1954 | free(buf); |
| 1955 | free(buf2); |
| 1956 | return NS_NOTFOUND; |
Lorenzo Colitti | 3d8f4ad | 2009-08-03 22:36:31 -0700 | [diff] [blame] | 1957 | } |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1958 | break; |
| 1959 | case AF_INET: |
| 1960 | q.name = name; |
| 1961 | q.qclass = C_IN; |
| 1962 | q.qtype = T_A; |
| 1963 | q.answer = buf->buf; |
| 1964 | q.anslen = sizeof(buf->buf); |
| 1965 | break; |
| 1966 | case AF_INET6: |
| 1967 | q.name = name; |
| 1968 | q.qclass = C_IN; |
| 1969 | q.qtype = T_AAAA; |
| 1970 | q.answer = buf->buf; |
| 1971 | q.anslen = sizeof(buf->buf); |
| 1972 | break; |
| 1973 | default: |
| 1974 | free(buf); |
| 1975 | free(buf2); |
| 1976 | return NS_UNAVAIL; |
| 1977 | } |
| 1978 | |
| 1979 | res = __res_get_state(); |
| 1980 | if (res == NULL) { |
| 1981 | free(buf); |
| 1982 | free(buf2); |
| 1983 | return NS_NOTFOUND; |
| 1984 | } |
| 1985 | |
Szymon Jakubczak | ea9bf67 | 2014-02-14 17:07:23 -0500 | [diff] [blame] | 1986 | /* this just sets our netid val in the thread private data so we don't have to |
Mattias Falk | c63e590 | 2011-08-23 14:34:14 +0200 | [diff] [blame] | 1987 | * modify the api's all the way down to res_send.c's res_nsend. We could |
| 1988 | * fully populate the thread private data here, but if we get down there |
| 1989 | * and have a cache hit that would be wasted, so we do the rest there on miss |
| 1990 | */ |
Ben Schwartz | 90a83be | 2017-04-24 17:57:11 -0400 | [diff] [blame] | 1991 | res_setnetcontext(res, netcontext); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1992 | if (res_searchN(name, &q, res) < 0) { |
| 1993 | __res_put_state(res); |
| 1994 | free(buf); |
| 1995 | free(buf2); |
| 1996 | return NS_NOTFOUND; |
| 1997 | } |
| 1998 | ai = getanswer(buf, q.n, q.name, q.qtype, pai); |
| 1999 | if (ai) { |
| 2000 | cur->ai_next = ai; |
| 2001 | while (cur && cur->ai_next) |
| 2002 | cur = cur->ai_next; |
| 2003 | } |
| 2004 | if (q.next) { |
| 2005 | ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai); |
| 2006 | if (ai) |
| 2007 | cur->ai_next = ai; |
| 2008 | } |
| 2009 | free(buf); |
| 2010 | free(buf2); |
| 2011 | if (sentinel.ai_next == NULL) { |
| 2012 | __res_put_state(res); |
| 2013 | switch (h_errno) { |
| 2014 | case HOST_NOT_FOUND: |
| 2015 | return NS_NOTFOUND; |
| 2016 | case TRY_AGAIN: |
| 2017 | return NS_TRYAGAIN; |
| 2018 | default: |
| 2019 | return NS_UNAVAIL; |
| 2020 | } |
| 2021 | } |
| 2022 | |
Erik Kline | 01e37c9 | 2015-06-25 14:27:34 +0900 | [diff] [blame] | 2023 | _rfc6724_sort(&sentinel, netcontext->app_mark, netcontext->uid); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2024 | |
| 2025 | __res_put_state(res); |
| 2026 | |
| 2027 | *((struct addrinfo **)rv) = sentinel.ai_next; |
| 2028 | return NS_SUCCESS; |
| 2029 | } |
| 2030 | |
| 2031 | static void |
| 2032 | _sethtent(FILE **hostf) |
| 2033 | { |
| 2034 | |
| 2035 | if (!*hostf) |
Elliott Hughes | c674edb | 2014-08-26 15:56:54 -0700 | [diff] [blame] | 2036 | *hostf = fopen(_PATH_HOSTS, "re"); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2037 | else |
| 2038 | rewind(*hostf); |
| 2039 | } |
| 2040 | |
| 2041 | static void |
| 2042 | _endhtent(FILE **hostf) |
| 2043 | { |
| 2044 | |
| 2045 | if (*hostf) { |
| 2046 | (void) fclose(*hostf); |
| 2047 | *hostf = NULL; |
| 2048 | } |
| 2049 | } |
| 2050 | |
| 2051 | static struct addrinfo * |
| 2052 | _gethtent(FILE **hostf, const char *name, const struct addrinfo *pai) |
| 2053 | { |
| 2054 | char *p; |
| 2055 | char *cp, *tname, *cname; |
| 2056 | struct addrinfo hints, *res0, *res; |
| 2057 | int error; |
| 2058 | const char *addr; |
| 2059 | char hostbuf[8*1024]; |
| 2060 | |
| 2061 | // fprintf(stderr, "_gethtent() name = '%s'\n", name); |
| 2062 | assert(name != NULL); |
| 2063 | assert(pai != NULL); |
| 2064 | |
Elliott Hughes | c674edb | 2014-08-26 15:56:54 -0700 | [diff] [blame] | 2065 | if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "re"))) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2066 | return (NULL); |
| 2067 | again: |
| 2068 | if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf))) |
| 2069 | return (NULL); |
| 2070 | if (*p == '#') |
| 2071 | goto again; |
| 2072 | if (!(cp = strpbrk(p, "#\n"))) |
| 2073 | goto again; |
| 2074 | *cp = '\0'; |
| 2075 | if (!(cp = strpbrk(p, " \t"))) |
| 2076 | goto again; |
| 2077 | *cp++ = '\0'; |
| 2078 | addr = p; |
| 2079 | /* if this is not something we're looking for, skip it. */ |
| 2080 | cname = NULL; |
| 2081 | while (cp && *cp) { |
| 2082 | if (*cp == ' ' || *cp == '\t') { |
| 2083 | cp++; |
| 2084 | continue; |
| 2085 | } |
| 2086 | if (!cname) |
| 2087 | cname = cp; |
| 2088 | tname = cp; |
| 2089 | if ((cp = strpbrk(cp, " \t")) != NULL) |
| 2090 | *cp++ = '\0'; |
| 2091 | // fprintf(stderr, "\ttname = '%s'", tname); |
| 2092 | if (strcasecmp(name, tname) == 0) |
| 2093 | goto found; |
| 2094 | } |
| 2095 | goto again; |
| 2096 | |
| 2097 | found: |
| 2098 | hints = *pai; |
| 2099 | hints.ai_flags = AI_NUMERICHOST; |
| 2100 | error = getaddrinfo(addr, NULL, &hints, &res0); |
| 2101 | if (error) |
| 2102 | goto again; |
| 2103 | for (res = res0; res; res = res->ai_next) { |
| 2104 | /* cover it up */ |
| 2105 | res->ai_flags = pai->ai_flags; |
| 2106 | |
| 2107 | if (pai->ai_flags & AI_CANONNAME) { |
| 2108 | if (get_canonname(pai, res, cname) != 0) { |
| 2109 | freeaddrinfo(res0); |
| 2110 | goto again; |
| 2111 | } |
| 2112 | } |
| 2113 | } |
| 2114 | return res0; |
| 2115 | } |
| 2116 | |
| 2117 | /*ARGSUSED*/ |
| 2118 | static int |
| 2119 | _files_getaddrinfo(void *rv, void *cb_data, va_list ap) |
| 2120 | { |
| 2121 | const char *name; |
| 2122 | const struct addrinfo *pai; |
| 2123 | struct addrinfo sentinel, *cur; |
| 2124 | struct addrinfo *p; |
| 2125 | FILE *hostf = NULL; |
| 2126 | |
| 2127 | name = va_arg(ap, char *); |
| 2128 | pai = va_arg(ap, struct addrinfo *); |
| 2129 | |
Tom Marshall | 2af9972 | 2016-06-17 16:38:12 -0700 | [diff] [blame] | 2130 | memset(&sentinel, 0, sizeof(sentinel)); |
| 2131 | cur = &sentinel; |
| 2132 | int gai_error = hc_getaddrinfo(name, NULL, pai, &cur); |
| 2133 | if (gai_error != EAI_SYSTEM) { |
| 2134 | *((struct addrinfo **)rv) = sentinel.ai_next; |
| 2135 | return (gai_error == 0 ? NS_SUCCESS : NS_NOTFOUND); |
| 2136 | } |
| 2137 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2138 | // fprintf(stderr, "_files_getaddrinfo() name = '%s'\n", name); |
| 2139 | memset(&sentinel, 0, sizeof(sentinel)); |
| 2140 | cur = &sentinel; |
| 2141 | |
| 2142 | _sethtent(&hostf); |
| 2143 | while ((p = _gethtent(&hostf, name, pai)) != NULL) { |
| 2144 | cur->ai_next = p; |
| 2145 | while (cur && cur->ai_next) |
| 2146 | cur = cur->ai_next; |
| 2147 | } |
| 2148 | _endhtent(&hostf); |
| 2149 | |
| 2150 | *((struct addrinfo **)rv) = sentinel.ai_next; |
| 2151 | if (sentinel.ai_next == NULL) |
| 2152 | return NS_NOTFOUND; |
| 2153 | return NS_SUCCESS; |
| 2154 | } |
| 2155 | |
| 2156 | /* resolver logic */ |
| 2157 | |
| 2158 | /* |
| 2159 | * Formulate a normal query, send, and await answer. |
| 2160 | * Returned answer is placed in supplied buffer "answer". |
| 2161 | * Perform preliminary check of answer, returning success only |
| 2162 | * if no error is indicated and the answer count is nonzero. |
| 2163 | * Return the size of the response on success, -1 on error. |
| 2164 | * Error number is left in h_errno. |
| 2165 | * |
| 2166 | * Caller must parse answer and determine whether it answers the question. |
| 2167 | */ |
| 2168 | static int |
| 2169 | res_queryN(const char *name, /* domain name */ struct res_target *target, |
| 2170 | res_state res) |
| 2171 | { |
| 2172 | u_char buf[MAXPACKET]; |
| 2173 | HEADER *hp; |
| 2174 | int n; |
| 2175 | struct res_target *t; |
| 2176 | int rcode; |
| 2177 | int ancount; |
| 2178 | |
| 2179 | assert(name != NULL); |
| 2180 | /* XXX: target may be NULL??? */ |
| 2181 | |
| 2182 | rcode = NOERROR; |
| 2183 | ancount = 0; |
| 2184 | |
| 2185 | for (t = target; t; t = t->next) { |
| 2186 | int class, type; |
| 2187 | u_char *answer; |
| 2188 | int anslen; |
Ben Schwartz | 6eed8e1 | 2017-10-02 12:26:05 -0400 | [diff] [blame] | 2189 | u_int oflags; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2190 | |
| 2191 | hp = (HEADER *)(void *)t->answer; |
Ben Schwartz | 6eed8e1 | 2017-10-02 12:26:05 -0400 | [diff] [blame] | 2192 | oflags = res->_flags; |
| 2193 | |
| 2194 | again: |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2195 | hp->rcode = NOERROR; /* default */ |
| 2196 | |
| 2197 | /* make it easier... */ |
| 2198 | class = t->qclass; |
| 2199 | type = t->qtype; |
| 2200 | answer = t->answer; |
| 2201 | anslen = t->anslen; |
| 2202 | #ifdef DEBUG |
| 2203 | if (res->options & RES_DEBUG) |
| 2204 | printf(";; res_nquery(%s, %d, %d)\n", name, class, type); |
| 2205 | #endif |
| 2206 | |
| 2207 | n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL, |
| 2208 | buf, sizeof(buf)); |
| 2209 | #ifdef RES_USE_EDNS0 |
Ben Schwartz | 6eed8e1 | 2017-10-02 12:26:05 -0400 | [diff] [blame] | 2210 | if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 && |
| 2211 | (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2212 | n = res_nopt(res, n, buf, sizeof(buf), anslen); |
| 2213 | #endif |
| 2214 | if (n <= 0) { |
| 2215 | #ifdef DEBUG |
| 2216 | if (res->options & RES_DEBUG) |
| 2217 | printf(";; res_nquery: mkquery failed\n"); |
| 2218 | #endif |
| 2219 | h_errno = NO_RECOVERY; |
| 2220 | return n; |
| 2221 | } |
| 2222 | n = res_nsend(res, buf, n, answer, anslen); |
| 2223 | #if 0 |
| 2224 | if (n < 0) { |
| 2225 | #ifdef DEBUG |
| 2226 | if (res->options & RES_DEBUG) |
| 2227 | printf(";; res_query: send error\n"); |
| 2228 | #endif |
| 2229 | h_errno = TRY_AGAIN; |
| 2230 | return n; |
| 2231 | } |
| 2232 | #endif |
| 2233 | |
| 2234 | if (n < 0 || hp->rcode != NOERROR || ntohs(hp->ancount) == 0) { |
| 2235 | rcode = hp->rcode; /* record most recent error */ |
Ben Schwartz | 6eed8e1 | 2017-10-02 12:26:05 -0400 | [diff] [blame] | 2236 | #ifdef RES_USE_EDNS0 |
| 2237 | /* if the query choked with EDNS0, retry without EDNS0 */ |
| 2238 | if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0 && |
| 2239 | ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) { |
| 2240 | res->_flags |= RES_F_EDNS0ERR; |
| 2241 | #ifdef DEBUG |
| 2242 | if (res->options & RES_DEBUG) |
| 2243 | printf(";; res_nquery: retry without EDNS0\n"); |
| 2244 | #endif |
| 2245 | goto again; |
| 2246 | } |
| 2247 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2248 | #ifdef DEBUG |
| 2249 | if (res->options & RES_DEBUG) |
| 2250 | printf(";; rcode = %u, ancount=%u\n", hp->rcode, |
| 2251 | ntohs(hp->ancount)); |
| 2252 | #endif |
| 2253 | continue; |
| 2254 | } |
| 2255 | |
| 2256 | ancount += ntohs(hp->ancount); |
| 2257 | |
| 2258 | t->n = n; |
| 2259 | } |
| 2260 | |
| 2261 | if (ancount == 0) { |
| 2262 | switch (rcode) { |
| 2263 | case NXDOMAIN: |
| 2264 | h_errno = HOST_NOT_FOUND; |
| 2265 | break; |
| 2266 | case SERVFAIL: |
| 2267 | h_errno = TRY_AGAIN; |
| 2268 | break; |
| 2269 | case NOERROR: |
| 2270 | h_errno = NO_DATA; |
| 2271 | break; |
| 2272 | case FORMERR: |
| 2273 | case NOTIMP: |
| 2274 | case REFUSED: |
| 2275 | default: |
| 2276 | h_errno = NO_RECOVERY; |
| 2277 | break; |
| 2278 | } |
| 2279 | return -1; |
| 2280 | } |
| 2281 | return ancount; |
| 2282 | } |
| 2283 | |
| 2284 | /* |
| 2285 | * Formulate a normal query, send, and retrieve answer in supplied buffer. |
| 2286 | * Return the size of the response on success, -1 on error. |
| 2287 | * If enabled, implement search rules until answer or unrecoverable failure |
| 2288 | * is detected. Error code, if any, is left in h_errno. |
| 2289 | */ |
| 2290 | static int |
| 2291 | res_searchN(const char *name, struct res_target *target, res_state res) |
| 2292 | { |
| 2293 | const char *cp, * const *domain; |
| 2294 | HEADER *hp; |
| 2295 | u_int dots; |
| 2296 | int trailing_dot, ret, saved_herrno; |
| 2297 | int got_nodata = 0, got_servfail = 0, tried_as_is = 0; |
| 2298 | |
| 2299 | assert(name != NULL); |
| 2300 | assert(target != NULL); |
| 2301 | |
| 2302 | hp = (HEADER *)(void *)target->answer; /*XXX*/ |
| 2303 | |
| 2304 | errno = 0; |
| 2305 | h_errno = HOST_NOT_FOUND; /* default, if we never query */ |
| 2306 | dots = 0; |
| 2307 | for (cp = name; *cp; cp++) |
| 2308 | dots += (*cp == '.'); |
| 2309 | trailing_dot = 0; |
| 2310 | if (cp > name && *--cp == '.') |
| 2311 | trailing_dot++; |
| 2312 | |
| 2313 | |
David 'Digit' Turner | 5e56370 | 2009-05-05 15:50:24 +0200 | [diff] [blame] | 2314 | //fprintf(stderr, "res_searchN() name = '%s'\n", name); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2315 | |
| 2316 | /* |
| 2317 | * if there aren't any dots, it could be a user-level alias |
| 2318 | */ |
| 2319 | if (!dots && (cp = __hostalias(name)) != NULL) { |
| 2320 | ret = res_queryN(cp, target, res); |
| 2321 | return ret; |
| 2322 | } |
| 2323 | |
| 2324 | /* |
| 2325 | * If there are dots in the name already, let's just give it a try |
| 2326 | * 'as is'. The threshold can be set with the "ndots" option. |
| 2327 | */ |
| 2328 | saved_herrno = -1; |
| 2329 | if (dots >= res->ndots) { |
| 2330 | ret = res_querydomainN(name, NULL, target, res); |
| 2331 | if (ret > 0) |
| 2332 | return (ret); |
| 2333 | saved_herrno = h_errno; |
| 2334 | tried_as_is++; |
| 2335 | } |
| 2336 | |
| 2337 | /* |
| 2338 | * We do at least one level of search if |
| 2339 | * - there is no dot and RES_DEFNAME is set, or |
| 2340 | * - there is at least one dot, there is no trailing dot, |
| 2341 | * and RES_DNSRCH is set. |
| 2342 | */ |
| 2343 | if ((!dots && (res->options & RES_DEFNAMES)) || |
| 2344 | (dots && !trailing_dot && (res->options & RES_DNSRCH))) { |
| 2345 | int done = 0; |
| 2346 | |
Robert Greenwalt | e0805a9 | 2013-07-31 16:53:46 -0700 | [diff] [blame] | 2347 | /* Unfortunately we need to set stuff up before |
| 2348 | * the domain stuff is tried. Will have a better |
| 2349 | * fix after thread pools are used. |
| 2350 | */ |
Szymon Jakubczak | ea9bf67 | 2014-02-14 17:07:23 -0500 | [diff] [blame] | 2351 | _resolv_populate_res_for_net(res); |
Robert Greenwalt | e0805a9 | 2013-07-31 16:53:46 -0700 | [diff] [blame] | 2352 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2353 | for (domain = (const char * const *)res->dnsrch; |
| 2354 | *domain && !done; |
| 2355 | domain++) { |
| 2356 | |
| 2357 | ret = res_querydomainN(name, *domain, target, res); |
| 2358 | if (ret > 0) |
| 2359 | return ret; |
| 2360 | |
| 2361 | /* |
| 2362 | * If no server present, give up. |
| 2363 | * If name isn't found in this domain, |
| 2364 | * keep trying higher domains in the search list |
| 2365 | * (if that's enabled). |
| 2366 | * On a NO_DATA error, keep trying, otherwise |
| 2367 | * a wildcard entry of another type could keep us |
| 2368 | * from finding this entry higher in the domain. |
| 2369 | * If we get some other error (negative answer or |
| 2370 | * server failure), then stop searching up, |
| 2371 | * but try the input name below in case it's |
| 2372 | * fully-qualified. |
| 2373 | */ |
| 2374 | if (errno == ECONNREFUSED) { |
| 2375 | h_errno = TRY_AGAIN; |
| 2376 | return -1; |
| 2377 | } |
| 2378 | |
| 2379 | switch (h_errno) { |
| 2380 | case NO_DATA: |
| 2381 | got_nodata++; |
| 2382 | /* FALLTHROUGH */ |
| 2383 | case HOST_NOT_FOUND: |
| 2384 | /* keep trying */ |
| 2385 | break; |
| 2386 | case TRY_AGAIN: |
| 2387 | if (hp->rcode == SERVFAIL) { |
| 2388 | /* try next search element, if any */ |
| 2389 | got_servfail++; |
| 2390 | break; |
| 2391 | } |
| 2392 | /* FALLTHROUGH */ |
| 2393 | default: |
| 2394 | /* anything else implies that we're done */ |
| 2395 | done++; |
| 2396 | } |
| 2397 | /* |
| 2398 | * if we got here for some reason other than DNSRCH, |
| 2399 | * we only wanted one iteration of the loop, so stop. |
| 2400 | */ |
| 2401 | if (!(res->options & RES_DNSRCH)) |
Lorenzo Colitti | b82532d | 2011-09-28 19:28:32 -0700 | [diff] [blame] | 2402 | done++; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 2403 | } |
| 2404 | } |
| 2405 | |
| 2406 | /* |
| 2407 | * if we have not already tried the name "as is", do that now. |
| 2408 | * note that we do this regardless of how many dots were in the |
| 2409 | * name or whether it ends with a dot. |
| 2410 | */ |
| 2411 | if (!tried_as_is) { |
| 2412 | ret = res_querydomainN(name, NULL, target, res); |
| 2413 | if (ret > 0) |
| 2414 | return ret; |
| 2415 | } |
| 2416 | |
| 2417 | /* |
| 2418 | * if we got here, we didn't satisfy the search. |
| 2419 | * if we did an initial full query, return that query's h_errno |
| 2420 | * (note that we wouldn't be here if that query had succeeded). |
| 2421 | * else if we ever got a nodata, send that back as the reason. |
| 2422 | * else send back meaningless h_errno, that being the one from |
| 2423 | * the last DNSRCH we did. |
| 2424 | */ |
| 2425 | if (saved_herrno != -1) |
| 2426 | h_errno = saved_herrno; |
| 2427 | else if (got_nodata) |
| 2428 | h_errno = NO_DATA; |
| 2429 | else if (got_servfail) |
| 2430 | h_errno = TRY_AGAIN; |
| 2431 | return -1; |
| 2432 | } |
| 2433 | |
| 2434 | /* |
| 2435 | * Perform a call on res_query on the concatenation of name and domain, |
| 2436 | * removing a trailing dot from name if domain is NULL. |
| 2437 | */ |
| 2438 | static int |
| 2439 | res_querydomainN(const char *name, const char *domain, |
| 2440 | struct res_target *target, res_state res) |
| 2441 | { |
| 2442 | char nbuf[MAXDNAME]; |
| 2443 | const char *longname = nbuf; |
| 2444 | size_t n, d; |
| 2445 | |
| 2446 | assert(name != NULL); |
| 2447 | /* XXX: target may be NULL??? */ |
| 2448 | |
| 2449 | #ifdef DEBUG |
| 2450 | if (res->options & RES_DEBUG) |
| 2451 | printf(";; res_querydomain(%s, %s)\n", |
| 2452 | name, domain?domain:"<Nil>"); |
| 2453 | #endif |
| 2454 | if (domain == NULL) { |
| 2455 | /* |
| 2456 | * Check for trailing '.'; |
| 2457 | * copy without '.' if present. |
| 2458 | */ |
| 2459 | n = strlen(name); |
| 2460 | if (n + 1 > sizeof(nbuf)) { |
| 2461 | h_errno = NO_RECOVERY; |
| 2462 | return -1; |
| 2463 | } |
| 2464 | if (n > 0 && name[--n] == '.') { |
| 2465 | strncpy(nbuf, name, n); |
| 2466 | nbuf[n] = '\0'; |
| 2467 | } else |
| 2468 | longname = name; |
| 2469 | } else { |
| 2470 | n = strlen(name); |
| 2471 | d = strlen(domain); |
| 2472 | if (n + 1 + d + 1 > sizeof(nbuf)) { |
| 2473 | h_errno = NO_RECOVERY; |
| 2474 | return -1; |
| 2475 | } |
| 2476 | snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain); |
| 2477 | } |
| 2478 | return res_queryN(longname, target, res); |
| 2479 | } |