17d56d374SYoshinobu Inoue /* 27d56d374SYoshinobu Inoue * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project. 37d56d374SYoshinobu Inoue * All rights reserved. 47d56d374SYoshinobu Inoue * 57d56d374SYoshinobu Inoue * Redistribution and use in source and binary forms, with or without 67d56d374SYoshinobu Inoue * modification, are permitted provided that the following conditions 77d56d374SYoshinobu Inoue * are met: 87d56d374SYoshinobu Inoue * 1. Redistributions of source code must retain the above copyright 97d56d374SYoshinobu Inoue * notice, this list of conditions and the following disclaimer. 107d56d374SYoshinobu Inoue * 2. Redistributions in binary form must reproduce the above copyright 117d56d374SYoshinobu Inoue * notice, this list of conditions and the following disclaimer in the 127d56d374SYoshinobu Inoue * documentation and/or other materials provided with the distribution. 137d56d374SYoshinobu Inoue * 3. Neither the name of the project nor the names of its contributors 147d56d374SYoshinobu Inoue * may be used to endorse or promote products derived from this software 157d56d374SYoshinobu Inoue * without specific prior written permission. 167d56d374SYoshinobu Inoue * 177d56d374SYoshinobu Inoue * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 187d56d374SYoshinobu Inoue * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 197d56d374SYoshinobu Inoue * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 207d56d374SYoshinobu Inoue * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 217d56d374SYoshinobu Inoue * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 227d56d374SYoshinobu Inoue * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 237d56d374SYoshinobu Inoue * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 247d56d374SYoshinobu Inoue * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 257d56d374SYoshinobu Inoue * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 267d56d374SYoshinobu Inoue * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 277d56d374SYoshinobu Inoue * SUCH DAMAGE. 287d56d374SYoshinobu Inoue * 297d56d374SYoshinobu Inoue * $FreeBSD$ 307d56d374SYoshinobu Inoue */ 317d56d374SYoshinobu Inoue /* $Id: name6.c,v 1.9 1999/10/29 03:04:26 itojun Exp $ */ 327d56d374SYoshinobu Inoue /* 337d56d374SYoshinobu Inoue * Atsushi Onoe <onoe@sm.sony.co.jp> 347d56d374SYoshinobu Inoue */ 357d56d374SYoshinobu Inoue 367d56d374SYoshinobu Inoue /* 377d56d374SYoshinobu Inoue * TODO for thread safe 387d56d374SYoshinobu Inoue * use mutex for _hostconf, _hostconf_init. 397d56d374SYoshinobu Inoue * rewrite resolvers to be thread safe 407d56d374SYoshinobu Inoue */ 417d56d374SYoshinobu Inoue 427d56d374SYoshinobu Inoue #include <sys/param.h> 437d56d374SYoshinobu Inoue #include <sys/socket.h> 447d56d374SYoshinobu Inoue #include <sys/time.h> 457d56d374SYoshinobu Inoue #include <netinet/in.h> 467d56d374SYoshinobu Inoue 477d56d374SYoshinobu Inoue #include <arpa/inet.h> 487d56d374SYoshinobu Inoue #include <arpa/nameser.h> 497d56d374SYoshinobu Inoue 507d56d374SYoshinobu Inoue #include <netdb.h> 517d56d374SYoshinobu Inoue #include <resolv.h> 527d56d374SYoshinobu Inoue #include <stdio.h> 537d56d374SYoshinobu Inoue #include <stdlib.h> 547d56d374SYoshinobu Inoue #include <string.h> 557d56d374SYoshinobu Inoue #include <unistd.h> 567d56d374SYoshinobu Inoue 577d56d374SYoshinobu Inoue #ifndef _PATH_HOSTS 587d56d374SYoshinobu Inoue #define _PATH_HOSTS "/etc/hosts" 597d56d374SYoshinobu Inoue #endif 607d56d374SYoshinobu Inoue 617d56d374SYoshinobu Inoue #ifndef MAXALIASES 627d56d374SYoshinobu Inoue #define MAXALIASES 10 637d56d374SYoshinobu Inoue #endif 647d56d374SYoshinobu Inoue #ifndef MAXADDRS 657d56d374SYoshinobu Inoue #define MAXADDRS 20 667d56d374SYoshinobu Inoue #endif 677d56d374SYoshinobu Inoue #ifndef MAXDNAME 687d56d374SYoshinobu Inoue #define MAXDNAME 1025 697d56d374SYoshinobu Inoue #endif 707d56d374SYoshinobu Inoue 717d56d374SYoshinobu Inoue #ifdef INET6 727d56d374SYoshinobu Inoue #define ADDRLEN(af) ((af) == AF_INET6 ? sizeof(struct in6_addr) : \ 737d56d374SYoshinobu Inoue sizeof(struct in_addr)) 747d56d374SYoshinobu Inoue #else 757d56d374SYoshinobu Inoue #define ADDRLEN(af) sizeof(struct in_addr) 767d56d374SYoshinobu Inoue #endif 777d56d374SYoshinobu Inoue 787d56d374SYoshinobu Inoue #define MAPADDR(ab, ina) \ 797d56d374SYoshinobu Inoue do { \ 807d56d374SYoshinobu Inoue memcpy(&(ab)->map_inaddr, ina, sizeof(struct in_addr)); \ 817d56d374SYoshinobu Inoue memset((ab)->map_zero, 0, sizeof((ab)->map_zero)); \ 827d56d374SYoshinobu Inoue memset((ab)->map_one, 0xff, sizeof((ab)->map_one)); \ 837d56d374SYoshinobu Inoue } while (0) 847d56d374SYoshinobu Inoue #define MAPADDRENABLED(flags) \ 857d56d374SYoshinobu Inoue (((flags) & AI_V4MAPPED) || \ 867d56d374SYoshinobu Inoue (((flags) & AI_V4MAPPED_CFG) && _mapped_addr_enabled())) 877d56d374SYoshinobu Inoue 887d56d374SYoshinobu Inoue union inx_addr { 897d56d374SYoshinobu Inoue struct in_addr in_addr; 907d56d374SYoshinobu Inoue #ifdef INET6 917d56d374SYoshinobu Inoue struct in6_addr in6_addr; 927d56d374SYoshinobu Inoue #endif 937d56d374SYoshinobu Inoue struct { 947d56d374SYoshinobu Inoue u_char mau_zero[10]; 957d56d374SYoshinobu Inoue u_char mau_one[2]; 967d56d374SYoshinobu Inoue struct in_addr mau_inaddr; 977d56d374SYoshinobu Inoue } map_addr_un; 987d56d374SYoshinobu Inoue #define map_zero map_addr_un.mau_zero 997d56d374SYoshinobu Inoue #define map_one map_addr_un.mau_one 1007d56d374SYoshinobu Inoue #define map_inaddr map_addr_un.mau_inaddr 1017d56d374SYoshinobu Inoue }; 1027d56d374SYoshinobu Inoue 1037d56d374SYoshinobu Inoue static struct hostent *_hpcopy(struct hostent *hp, int *errp); 1047d56d374SYoshinobu Inoue static struct hostent *_hpaddr(int af, const char *name, void *addr, int *errp); 1057d56d374SYoshinobu Inoue static struct hostent *_hpmerge(struct hostent *hp1, struct hostent *hp2, int *errp); 1067d56d374SYoshinobu Inoue #ifdef INET6 1077d56d374SYoshinobu Inoue static struct hostent *_hpmapv6(struct hostent *hp, int *errp); 1087d56d374SYoshinobu Inoue #endif 1097d56d374SYoshinobu Inoue static struct hostent *_hpsort(struct hostent *hp); 1107d56d374SYoshinobu Inoue static struct hostent *_ghbyname(const char *name, int af, int flags, int *errp); 1117d56d374SYoshinobu Inoue static char *_hgetword(char **pp); 1127d56d374SYoshinobu Inoue static int _mapped_addr_enabled(void); 1137d56d374SYoshinobu Inoue 1147d56d374SYoshinobu Inoue static FILE *_files_open(int *errp); 1157d56d374SYoshinobu Inoue static struct hostent *_files_ghbyname(const char *name, int af, int *errp); 1167d56d374SYoshinobu Inoue static struct hostent *_files_ghbyaddr(const void *addr, int addrlen, int af, int *errp); 1177d56d374SYoshinobu Inoue static void _files_shent(int stayopen); 1187d56d374SYoshinobu Inoue static void _files_ehent(void); 1197d56d374SYoshinobu Inoue static struct hostent *_dns_ghbyname(const char *name, int af, int *errp); 1207d56d374SYoshinobu Inoue static struct hostent *_dns_ghbyaddr(const void *addr, int addrlen, int af, int *errp); 1217d56d374SYoshinobu Inoue static void _dns_shent(int stayopen); 1227d56d374SYoshinobu Inoue static void _dns_ehent(void); 1237d56d374SYoshinobu Inoue #ifdef ICMPNL 1247d56d374SYoshinobu Inoue static struct hostent *_icmp_ghbyaddr(const void *addr, int addrlen, int af, int *errp); 1257d56d374SYoshinobu Inoue #endif /* ICMPNL */ 1267d56d374SYoshinobu Inoue 1277d56d374SYoshinobu Inoue /* 1287d56d374SYoshinobu Inoue * Select order host function. 1297d56d374SYoshinobu Inoue */ 1307d56d374SYoshinobu Inoue #define MAXHOSTCONF 4 1317d56d374SYoshinobu Inoue 1327d56d374SYoshinobu Inoue #ifndef HOSTCONF 1337d56d374SYoshinobu Inoue # define HOSTCONF "/etc/host.conf" 1347d56d374SYoshinobu Inoue #endif /* !HOSTCONF */ 1357d56d374SYoshinobu Inoue 1367d56d374SYoshinobu Inoue struct _hostconf { 1377d56d374SYoshinobu Inoue struct hostent *(*byname)(const char *name, int af, int *errp); 1387d56d374SYoshinobu Inoue struct hostent *(*byaddr)(const void *addr, int addrlen, int af, int *errp); 1397d56d374SYoshinobu Inoue }; 1407d56d374SYoshinobu Inoue 1417d56d374SYoshinobu Inoue /* default order */ 1427d56d374SYoshinobu Inoue static struct _hostconf _hostconf[MAXHOSTCONF] = { 1437d56d374SYoshinobu Inoue { _dns_ghbyname, _dns_ghbyaddr }, 1447d56d374SYoshinobu Inoue { _files_ghbyname, _files_ghbyaddr }, 1457d56d374SYoshinobu Inoue #ifdef ICMPNL 1467d56d374SYoshinobu Inoue { NULL, _icmp_ghbyaddr }, 1477d56d374SYoshinobu Inoue #endif /* ICMPNL */ 1487d56d374SYoshinobu Inoue }; 1497d56d374SYoshinobu Inoue 1507d56d374SYoshinobu Inoue static int _hostconf_init_done; 1517d56d374SYoshinobu Inoue static void _hostconf_init(void); 1527d56d374SYoshinobu Inoue 1537d56d374SYoshinobu Inoue /* 1547d56d374SYoshinobu Inoue * Initialize hostconf structure. 1557d56d374SYoshinobu Inoue */ 1567d56d374SYoshinobu Inoue 1577d56d374SYoshinobu Inoue static void 1587d56d374SYoshinobu Inoue _hostconf_init(void) 1597d56d374SYoshinobu Inoue { 1607d56d374SYoshinobu Inoue FILE *fp; 1617d56d374SYoshinobu Inoue int n; 1627d56d374SYoshinobu Inoue char *p, *line; 1637d56d374SYoshinobu Inoue char buf[BUFSIZ]; 1647d56d374SYoshinobu Inoue 1657d56d374SYoshinobu Inoue _hostconf_init_done = 1; 1667d56d374SYoshinobu Inoue n = 0; 1677d56d374SYoshinobu Inoue p = HOSTCONF; 1687d56d374SYoshinobu Inoue if ((fp = fopen(p, "r")) == NULL) 1697d56d374SYoshinobu Inoue return; 1707d56d374SYoshinobu Inoue while (n < MAXHOSTCONF && fgets(buf, sizeof(buf), fp)) { 1717d56d374SYoshinobu Inoue line = buf; 1727d56d374SYoshinobu Inoue if ((p = _hgetword(&line)) == NULL) 1737d56d374SYoshinobu Inoue continue; 1747d56d374SYoshinobu Inoue do { 1757d56d374SYoshinobu Inoue if (strcmp(p, "hosts") == 0 1767d56d374SYoshinobu Inoue || strcmp(p, "local") == 0 1777d56d374SYoshinobu Inoue || strcmp(p, "file") == 0 1787d56d374SYoshinobu Inoue || strcmp(p, "files") == 0) { 1797d56d374SYoshinobu Inoue _hostconf[n].byname = _files_ghbyname; 1807d56d374SYoshinobu Inoue _hostconf[n].byaddr = _files_ghbyaddr; 1817d56d374SYoshinobu Inoue n++; 1827d56d374SYoshinobu Inoue } 1837d56d374SYoshinobu Inoue else if (strcmp(p, "dns") == 0 1847d56d374SYoshinobu Inoue || strcmp(p, "bind") == 0) { 1857d56d374SYoshinobu Inoue _hostconf[n].byname = _dns_ghbyname; 1867d56d374SYoshinobu Inoue _hostconf[n].byaddr = _dns_ghbyaddr; 1877d56d374SYoshinobu Inoue n++; 1887d56d374SYoshinobu Inoue } 1897d56d374SYoshinobu Inoue #ifdef ICMPNL 1907d56d374SYoshinobu Inoue else if (strcmp(p, "icmp") == 0) { 1917d56d374SYoshinobu Inoue _hostconf[n].byname = NULL; 1927d56d374SYoshinobu Inoue _hostconf[n].byaddr = _icmp_ghbyaddr; 1937d56d374SYoshinobu Inoue n++; 1947d56d374SYoshinobu Inoue } 1957d56d374SYoshinobu Inoue #endif /* ICMPNL */ 1967d56d374SYoshinobu Inoue } while ((p = _hgetword(&line)) != NULL); 1977d56d374SYoshinobu Inoue } 1987d56d374SYoshinobu Inoue fclose(fp); 1997d56d374SYoshinobu Inoue if (n < 0) { 2007d56d374SYoshinobu Inoue /* no keyword found. do not change default configuration */ 2017d56d374SYoshinobu Inoue return; 2027d56d374SYoshinobu Inoue } 2037d56d374SYoshinobu Inoue for (; n < MAXHOSTCONF; n++) { 2047d56d374SYoshinobu Inoue _hostconf[n].byname = NULL; 2057d56d374SYoshinobu Inoue _hostconf[n].byaddr = NULL; 2067d56d374SYoshinobu Inoue } 2077d56d374SYoshinobu Inoue } 2087d56d374SYoshinobu Inoue 2097d56d374SYoshinobu Inoue /* 2107d56d374SYoshinobu Inoue * Check if kernel supports mapped address. 2117d56d374SYoshinobu Inoue * implementation dependent 2127d56d374SYoshinobu Inoue */ 2137d56d374SYoshinobu Inoue #ifdef __KAME__ 2147d56d374SYoshinobu Inoue #include <sys/sysctl.h> 2157d56d374SYoshinobu Inoue #endif /* __KAME__ */ 2167d56d374SYoshinobu Inoue 2177d56d374SYoshinobu Inoue static int 2187d56d374SYoshinobu Inoue _mapped_addr_enabled(void) 2197d56d374SYoshinobu Inoue { 2207d56d374SYoshinobu Inoue /* implementation dependent check */ 2217d56d374SYoshinobu Inoue #if defined(__KAME__) && defined(IPV6CTL_MAPPED_ADDR) 2227d56d374SYoshinobu Inoue int mib[4]; 2237d56d374SYoshinobu Inoue size_t len; 2247d56d374SYoshinobu Inoue int val; 2257d56d374SYoshinobu Inoue 2267d56d374SYoshinobu Inoue mib[0] = CTL_NET; 2277d56d374SYoshinobu Inoue mib[1] = PF_INET6; 2287d56d374SYoshinobu Inoue mib[2] = IPPROTO_IPV6; 2297d56d374SYoshinobu Inoue mib[3] = IPV6CTL_MAPPED_ADDR; 2307d56d374SYoshinobu Inoue len = sizeof(val); 2317d56d374SYoshinobu Inoue if (sysctl(mib, 4, &val, &len, 0, 0) == 0 && val != 0) 2327d56d374SYoshinobu Inoue return 1; 2337d56d374SYoshinobu Inoue #endif /* __KAME__ && IPV6CTL_MAPPED_ADDR */ 2347d56d374SYoshinobu Inoue return 0; 2357d56d374SYoshinobu Inoue } 2367d56d374SYoshinobu Inoue 2377d56d374SYoshinobu Inoue /* 2387d56d374SYoshinobu Inoue * Functions defined in RFC2553 2397d56d374SYoshinobu Inoue * getipnodebyname, getipnodebyadr, freehostent 2407d56d374SYoshinobu Inoue */ 2417d56d374SYoshinobu Inoue 2427d56d374SYoshinobu Inoue static struct hostent * 2437d56d374SYoshinobu Inoue _ghbyname(const char *name, int af, int flags, int *errp) 2447d56d374SYoshinobu Inoue { 2457d56d374SYoshinobu Inoue struct hostent *hp; 2467d56d374SYoshinobu Inoue int i; 2477d56d374SYoshinobu Inoue 2487d56d374SYoshinobu Inoue if (flags & AI_ADDRCONFIG) { 2497d56d374SYoshinobu Inoue int s; 2507d56d374SYoshinobu Inoue 2517d56d374SYoshinobu Inoue if ((s = socket(af, SOCK_DGRAM, 0)) < 0) 2527d56d374SYoshinobu Inoue return NULL; 2537d56d374SYoshinobu Inoue /* 2547d56d374SYoshinobu Inoue * TODO: 2557d56d374SYoshinobu Inoue * Note that implementation dependent test for address 2567d56d374SYoshinobu Inoue * configuration should be done everytime called 2577d56d374SYoshinobu Inoue * (or apropriate interval), 2587d56d374SYoshinobu Inoue * because addresses will be dynamically assigned or deleted. 2597d56d374SYoshinobu Inoue */ 2609233c4d9SJason Evans _close(s); 2617d56d374SYoshinobu Inoue } 2627d56d374SYoshinobu Inoue 2637d56d374SYoshinobu Inoue for (i = 0; i < MAXHOSTCONF; i++) { 2647d56d374SYoshinobu Inoue if (_hostconf[i].byname 2657d56d374SYoshinobu Inoue && (hp = (*_hostconf[i].byname)(name, af, errp)) 2667d56d374SYoshinobu Inoue != NULL) 2677d56d374SYoshinobu Inoue return hp; 2687d56d374SYoshinobu Inoue } 2697d56d374SYoshinobu Inoue 2707d56d374SYoshinobu Inoue return NULL; 2717d56d374SYoshinobu Inoue } 2727d56d374SYoshinobu Inoue 2737d56d374SYoshinobu Inoue struct hostent * 2747d56d374SYoshinobu Inoue getipnodebyname(const char *name, int af, int flags, int *errp) 2757d56d374SYoshinobu Inoue { 2767d56d374SYoshinobu Inoue struct hostent *hp; 2777d56d374SYoshinobu Inoue union inx_addr addrbuf; 2787d56d374SYoshinobu Inoue 2797d56d374SYoshinobu Inoue if (af != AF_INET 2807d56d374SYoshinobu Inoue #ifdef INET6 2817d56d374SYoshinobu Inoue && af != AF_INET6 2827d56d374SYoshinobu Inoue #endif 2837d56d374SYoshinobu Inoue ) 2847d56d374SYoshinobu Inoue { 2857d56d374SYoshinobu Inoue *errp = NO_RECOVERY; 2867d56d374SYoshinobu Inoue return NULL; 2877d56d374SYoshinobu Inoue } 2887d56d374SYoshinobu Inoue 2897d56d374SYoshinobu Inoue #ifdef INET6 2907d56d374SYoshinobu Inoue /* special case for literal address */ 2917d56d374SYoshinobu Inoue if (inet_pton(AF_INET6, name, &addrbuf) == 1) { 2927d56d374SYoshinobu Inoue if (af != AF_INET6) { 2937d56d374SYoshinobu Inoue *errp = HOST_NOT_FOUND; 2947d56d374SYoshinobu Inoue return NULL; 2957d56d374SYoshinobu Inoue } 2967d56d374SYoshinobu Inoue return _hpaddr(af, name, &addrbuf, errp); 2977d56d374SYoshinobu Inoue } 2987d56d374SYoshinobu Inoue #endif 299be26adb5SYoshinobu Inoue if (inet_aton(name, (struct in_addr *)&addrbuf) == 1) { 3007d56d374SYoshinobu Inoue if (af != AF_INET) { 3017d56d374SYoshinobu Inoue if (MAPADDRENABLED(flags)) { 3027d56d374SYoshinobu Inoue MAPADDR(&addrbuf, &addrbuf.in_addr); 3037d56d374SYoshinobu Inoue } else { 3047d56d374SYoshinobu Inoue *errp = HOST_NOT_FOUND; 3057d56d374SYoshinobu Inoue return NULL; 3067d56d374SYoshinobu Inoue } 3077d56d374SYoshinobu Inoue } 3087d56d374SYoshinobu Inoue return _hpaddr(af, name, &addrbuf, errp); 3097d56d374SYoshinobu Inoue } 3107d56d374SYoshinobu Inoue 3117d56d374SYoshinobu Inoue if (!_hostconf_init_done) 3127d56d374SYoshinobu Inoue _hostconf_init(); 3137d56d374SYoshinobu Inoue 3147d56d374SYoshinobu Inoue *errp = HOST_NOT_FOUND; 3157d56d374SYoshinobu Inoue hp = _ghbyname(name, af, flags, errp); 3167d56d374SYoshinobu Inoue 3177d56d374SYoshinobu Inoue #ifdef INET6 3187d56d374SYoshinobu Inoue if (af == AF_INET6 3197d56d374SYoshinobu Inoue && ((flags & AI_ALL) || hp == NULL) 3207d56d374SYoshinobu Inoue && (MAPADDRENABLED(flags))) { 3217d56d374SYoshinobu Inoue struct hostent *hp2 = _ghbyname(name, AF_INET, flags, errp); 3227d56d374SYoshinobu Inoue if (hp == NULL) 3237d56d374SYoshinobu Inoue hp = _hpmapv6(hp2, errp); 3247d56d374SYoshinobu Inoue else { 3257d56d374SYoshinobu Inoue if (hp2 && strcmp(hp->h_name, hp2->h_name) != 0) { 3267d56d374SYoshinobu Inoue freehostent(hp2); 3277d56d374SYoshinobu Inoue hp2 = NULL; 3287d56d374SYoshinobu Inoue } 3297d56d374SYoshinobu Inoue hp = _hpmerge(hp, hp2, errp); 3307d56d374SYoshinobu Inoue } 3317d56d374SYoshinobu Inoue } 3327d56d374SYoshinobu Inoue #endif 3337d56d374SYoshinobu Inoue return _hpsort(hp); 3347d56d374SYoshinobu Inoue } 3357d56d374SYoshinobu Inoue 3367d56d374SYoshinobu Inoue struct hostent * 3377d56d374SYoshinobu Inoue getipnodebyaddr(const void *src, size_t len, int af, int *errp) 3387d56d374SYoshinobu Inoue { 3397d56d374SYoshinobu Inoue struct hostent *hp; 3407d56d374SYoshinobu Inoue int i; 3417d56d374SYoshinobu Inoue #ifdef INET6 3427d56d374SYoshinobu Inoue struct in6_addr addrbuf; 3437d56d374SYoshinobu Inoue #else 3447d56d374SYoshinobu Inoue struct in_addr addrbuf; 3457d56d374SYoshinobu Inoue #endif 3467d56d374SYoshinobu Inoue 3477d56d374SYoshinobu Inoue *errp = HOST_NOT_FOUND; 3487d56d374SYoshinobu Inoue 3497d56d374SYoshinobu Inoue switch (af) { 3507d56d374SYoshinobu Inoue case AF_INET: 3517d56d374SYoshinobu Inoue if (len != sizeof(struct in_addr)) { 3527d56d374SYoshinobu Inoue *errp = NO_RECOVERY; 3537d56d374SYoshinobu Inoue return NULL; 3547d56d374SYoshinobu Inoue } 3557d56d374SYoshinobu Inoue if ((long)src & ~(sizeof(struct in_addr) - 1)) { 3567d56d374SYoshinobu Inoue memcpy(&addrbuf, src, len); 3577d56d374SYoshinobu Inoue src = &addrbuf; 3587d56d374SYoshinobu Inoue } 3597d56d374SYoshinobu Inoue if (((struct in_addr *)src)->s_addr == 0) 3607d56d374SYoshinobu Inoue return NULL; 3617d56d374SYoshinobu Inoue break; 3627d56d374SYoshinobu Inoue #ifdef INET6 3637d56d374SYoshinobu Inoue case AF_INET6: 3647d56d374SYoshinobu Inoue if (len != sizeof(struct in6_addr)) { 3657d56d374SYoshinobu Inoue *errp = NO_RECOVERY; 3667d56d374SYoshinobu Inoue return NULL; 3677d56d374SYoshinobu Inoue } 3687d56d374SYoshinobu Inoue if ((long)src & ~(sizeof(struct in6_addr) / 2 - 1)) { /*XXX*/ 3697d56d374SYoshinobu Inoue memcpy(&addrbuf, src, len); 3707d56d374SYoshinobu Inoue src = &addrbuf; 3717d56d374SYoshinobu Inoue } 3723d670abcSYoshinobu Inoue if (IN6_IS_ADDR_UNSPECIFIED((struct in6_addr *)src)) 3733d670abcSYoshinobu Inoue return NULL; 3747d56d374SYoshinobu Inoue if (IN6_IS_ADDR_V4MAPPED((struct in6_addr *)src) 3757d56d374SYoshinobu Inoue || IN6_IS_ADDR_V4COMPAT((struct in6_addr *)src)) { 3767d56d374SYoshinobu Inoue src = (char *)src + 3777d56d374SYoshinobu Inoue (sizeof(struct in6_addr) - sizeof(struct in_addr)); 3787d56d374SYoshinobu Inoue af = AF_INET; 3797d56d374SYoshinobu Inoue len = sizeof(struct in_addr); 3807d56d374SYoshinobu Inoue } 3817d56d374SYoshinobu Inoue break; 3827d56d374SYoshinobu Inoue #endif 3837d56d374SYoshinobu Inoue default: 3847d56d374SYoshinobu Inoue *errp = NO_RECOVERY; 3857d56d374SYoshinobu Inoue return NULL; 3867d56d374SYoshinobu Inoue } 3877d56d374SYoshinobu Inoue 3887d56d374SYoshinobu Inoue if (!_hostconf_init_done) 3897d56d374SYoshinobu Inoue _hostconf_init(); 3907d56d374SYoshinobu Inoue for (i = 0; i < MAXHOSTCONF; i++) { 3917d56d374SYoshinobu Inoue if (_hostconf[i].byaddr 3927d56d374SYoshinobu Inoue && (hp = (*_hostconf[i].byaddr)(src, len, af, errp)) != NULL) 3937d56d374SYoshinobu Inoue return hp; 3947d56d374SYoshinobu Inoue } 3957d56d374SYoshinobu Inoue 3967d56d374SYoshinobu Inoue return NULL; 3977d56d374SYoshinobu Inoue } 3987d56d374SYoshinobu Inoue 3997d56d374SYoshinobu Inoue void 4007d56d374SYoshinobu Inoue freehostent(struct hostent *ptr) 4017d56d374SYoshinobu Inoue { 4027d56d374SYoshinobu Inoue free(ptr); 4037d56d374SYoshinobu Inoue } 4047d56d374SYoshinobu Inoue 4057d56d374SYoshinobu Inoue #if 0 4067d56d374SYoshinobu Inoue 4077d56d374SYoshinobu Inoue /* XXX: should be deprecated */ 4087d56d374SYoshinobu Inoue struct hostent * 4097d56d374SYoshinobu Inoue getnodebyname(const char *name, int af, int flags) 4107d56d374SYoshinobu Inoue { 4117d56d374SYoshinobu Inoue return getipnodebyname(name, af, flags, &h_errno); 4127d56d374SYoshinobu Inoue } 4137d56d374SYoshinobu Inoue 4147d56d374SYoshinobu Inoue #ifdef __warn_references 4157d56d374SYoshinobu Inoue __warn_references(getnodebyname, 4167d56d374SYoshinobu Inoue "warning: getnodebyname() deprecated, " 4177d56d374SYoshinobu Inoue "should use getaddrinfo() or getipnodebyname()"); 4187d56d374SYoshinobu Inoue #endif 4197d56d374SYoshinobu Inoue 4207d56d374SYoshinobu Inoue struct hostent * 4217d56d374SYoshinobu Inoue getnodebyaddr(const void *src, size_t len, int af) 4227d56d374SYoshinobu Inoue { 4237d56d374SYoshinobu Inoue return getipnodebyaddr(src, len, af, &h_errno); 4247d56d374SYoshinobu Inoue } 4257d56d374SYoshinobu Inoue 4267d56d374SYoshinobu Inoue #ifdef __warn_references 4277d56d374SYoshinobu Inoue __warn_references(getnodebyaddr, 4287d56d374SYoshinobu Inoue "warning: getnodebyaddr() deprecated, " 4297d56d374SYoshinobu Inoue "should use getnameinfo() or getipnodebyaddr()"); 4307d56d374SYoshinobu Inoue #endif 4317d56d374SYoshinobu Inoue 4327d56d374SYoshinobu Inoue #endif 4337d56d374SYoshinobu Inoue 4347d56d374SYoshinobu Inoue /* 4357d56d374SYoshinobu Inoue * Private utility functions 4367d56d374SYoshinobu Inoue */ 4377d56d374SYoshinobu Inoue 4387d56d374SYoshinobu Inoue /* 4397d56d374SYoshinobu Inoue * _hpcopy: allocate and copy hostent structure 4407d56d374SYoshinobu Inoue */ 4417d56d374SYoshinobu Inoue static struct hostent * 4427d56d374SYoshinobu Inoue _hpcopy(struct hostent *hp, int *errp) 4437d56d374SYoshinobu Inoue { 4447d56d374SYoshinobu Inoue struct hostent *nhp; 4457d56d374SYoshinobu Inoue char *cp, **pp; 4467d56d374SYoshinobu Inoue int size, addrsize; 4477d56d374SYoshinobu Inoue int nalias = 0, naddr = 0; 4487d56d374SYoshinobu Inoue int al_off; 4497d56d374SYoshinobu Inoue int i; 4507d56d374SYoshinobu Inoue 4517d56d374SYoshinobu Inoue if (hp == NULL) 4527d56d374SYoshinobu Inoue return hp; 4537d56d374SYoshinobu Inoue 4547d56d374SYoshinobu Inoue /* count size to be allocated */ 4557d56d374SYoshinobu Inoue size = sizeof(struct hostent); 4567d56d374SYoshinobu Inoue if (hp->h_name != NULL && *hp->h_name != '\0') 4577d56d374SYoshinobu Inoue size += strlen(hp->h_name) + 1; 4587d56d374SYoshinobu Inoue if ((pp = hp->h_aliases) != NULL) { 4597d56d374SYoshinobu Inoue for (i = 0; *pp != NULL; i++, pp++) { 4607d56d374SYoshinobu Inoue if (**pp != '\0') { 4617d56d374SYoshinobu Inoue size += strlen(*pp) + 1; 4627d56d374SYoshinobu Inoue nalias++; 4637d56d374SYoshinobu Inoue } 4647d56d374SYoshinobu Inoue } 4657d56d374SYoshinobu Inoue } 4667d56d374SYoshinobu Inoue /* adjust alignment */ 4677d56d374SYoshinobu Inoue size = ALIGN(size); 4687d56d374SYoshinobu Inoue al_off = size; 4697d56d374SYoshinobu Inoue size += sizeof(char *) * (nalias + 1); 4707d56d374SYoshinobu Inoue addrsize = ALIGN(hp->h_length); 4717d56d374SYoshinobu Inoue if ((pp = hp->h_addr_list) != NULL) { 4727d56d374SYoshinobu Inoue while (*pp++ != NULL) 4737d56d374SYoshinobu Inoue naddr++; 4747d56d374SYoshinobu Inoue } 4757d56d374SYoshinobu Inoue size += addrsize * naddr; 4767d56d374SYoshinobu Inoue size += sizeof(char *) * (naddr + 1); 4777d56d374SYoshinobu Inoue 4787d56d374SYoshinobu Inoue /* copy */ 4797d56d374SYoshinobu Inoue if ((nhp = (struct hostent *)malloc(size)) == NULL) { 4807d56d374SYoshinobu Inoue *errp = TRY_AGAIN; 4817d56d374SYoshinobu Inoue return NULL; 4827d56d374SYoshinobu Inoue } 4837d56d374SYoshinobu Inoue cp = (char *)&nhp[1]; 4847d56d374SYoshinobu Inoue if (hp->h_name != NULL && *hp->h_name != '\0') { 4857d56d374SYoshinobu Inoue nhp->h_name = cp; 4867d56d374SYoshinobu Inoue strcpy(cp, hp->h_name); 4877d56d374SYoshinobu Inoue cp += strlen(cp) + 1; 4887d56d374SYoshinobu Inoue } else 4897d56d374SYoshinobu Inoue nhp->h_name = NULL; 4907d56d374SYoshinobu Inoue nhp->h_aliases = (char **)((char *)nhp + al_off); 4917d56d374SYoshinobu Inoue if ((pp = hp->h_aliases) != NULL) { 4927d56d374SYoshinobu Inoue for (i = 0; *pp != NULL; pp++) { 4937d56d374SYoshinobu Inoue if (**pp != '\0') { 4947d56d374SYoshinobu Inoue nhp->h_aliases[i++] = cp; 4957d56d374SYoshinobu Inoue strcpy(cp, *pp); 4967d56d374SYoshinobu Inoue cp += strlen(cp) + 1; 4977d56d374SYoshinobu Inoue } 4987d56d374SYoshinobu Inoue } 4997d56d374SYoshinobu Inoue } 5007d56d374SYoshinobu Inoue nhp->h_aliases[nalias] = NULL; 5017d56d374SYoshinobu Inoue cp = (char *)&nhp->h_aliases[nalias + 1]; 5027d56d374SYoshinobu Inoue nhp->h_addrtype = hp->h_addrtype; 5037d56d374SYoshinobu Inoue nhp->h_length = hp->h_length; 5047d56d374SYoshinobu Inoue nhp->h_addr_list = (char **)cp; 5057d56d374SYoshinobu Inoue if ((pp = hp->h_addr_list) != NULL) { 5067d56d374SYoshinobu Inoue cp = (char *)&nhp->h_addr_list[naddr + 1]; 5077d56d374SYoshinobu Inoue for (i = 0; *pp != NULL; pp++) { 5087d56d374SYoshinobu Inoue nhp->h_addr_list[i++] = cp; 5097d56d374SYoshinobu Inoue memcpy(cp, *pp, hp->h_length); 5107d56d374SYoshinobu Inoue cp += addrsize; 5117d56d374SYoshinobu Inoue } 5127d56d374SYoshinobu Inoue } 5137d56d374SYoshinobu Inoue nhp->h_addr_list[naddr] = NULL; 5147d56d374SYoshinobu Inoue return nhp; 5157d56d374SYoshinobu Inoue } 5167d56d374SYoshinobu Inoue 5177d56d374SYoshinobu Inoue /* 5187d56d374SYoshinobu Inoue * _hpaddr: construct hostent structure with one address 5197d56d374SYoshinobu Inoue */ 5207d56d374SYoshinobu Inoue static struct hostent * 5217d56d374SYoshinobu Inoue _hpaddr(int af, const char *name, void *addr, int *errp) 5227d56d374SYoshinobu Inoue { 5237d56d374SYoshinobu Inoue struct hostent *hp, hpbuf; 5247d56d374SYoshinobu Inoue char *addrs[2]; 5257d56d374SYoshinobu Inoue 5267d56d374SYoshinobu Inoue hp = &hpbuf; 5277d56d374SYoshinobu Inoue hp->h_name = (char *)name; 5287d56d374SYoshinobu Inoue hp->h_aliases = NULL; 5297d56d374SYoshinobu Inoue hp->h_addrtype = af; 5307d56d374SYoshinobu Inoue hp->h_length = ADDRLEN(af); 5317d56d374SYoshinobu Inoue hp->h_addr_list = addrs; 5327d56d374SYoshinobu Inoue addrs[0] = (char *)addr; 5337d56d374SYoshinobu Inoue addrs[1] = NULL; 5347d56d374SYoshinobu Inoue return _hpcopy(hp, errp); 5357d56d374SYoshinobu Inoue } 5367d56d374SYoshinobu Inoue 5377d56d374SYoshinobu Inoue /* 5387d56d374SYoshinobu Inoue * _hpmerge: merge 2 hostent structure, arguments will be freed 5397d56d374SYoshinobu Inoue */ 5407d56d374SYoshinobu Inoue static struct hostent * 5417d56d374SYoshinobu Inoue _hpmerge(struct hostent *hp1, struct hostent *hp2, int *errp) 5427d56d374SYoshinobu Inoue { 5437d56d374SYoshinobu Inoue int i, j; 5447d56d374SYoshinobu Inoue int naddr, nalias; 5457d56d374SYoshinobu Inoue char **pp; 5467d56d374SYoshinobu Inoue struct hostent *hp, hpbuf; 5477d56d374SYoshinobu Inoue char *aliases[MAXALIASES + 1], *addrs[MAXADDRS + 1]; 5487d56d374SYoshinobu Inoue union inx_addr addrbuf[MAXADDRS]; 5497d56d374SYoshinobu Inoue 5507d56d374SYoshinobu Inoue if (hp1 == NULL) 5517d56d374SYoshinobu Inoue return hp2; 5527d56d374SYoshinobu Inoue if (hp2 == NULL) 5537d56d374SYoshinobu Inoue return hp1; 5547d56d374SYoshinobu Inoue 5557d56d374SYoshinobu Inoue #define HP(i) (i == 1 ? hp1 : hp2) 5567d56d374SYoshinobu Inoue hp = &hpbuf; 5577d56d374SYoshinobu Inoue hp->h_name = (hp1->h_name != NULL ? hp1->h_name : hp2->h_name); 5587d56d374SYoshinobu Inoue hp->h_aliases = aliases; 5597d56d374SYoshinobu Inoue nalias = 0; 5607d56d374SYoshinobu Inoue for (i = 1; i <= 2; i++) { 5617d56d374SYoshinobu Inoue if ((pp = HP(i)->h_aliases) == NULL) 5627d56d374SYoshinobu Inoue continue; 5637d56d374SYoshinobu Inoue for (; nalias < MAXALIASES && *pp != NULL; pp++) { 5647d56d374SYoshinobu Inoue /* check duplicates */ 5657d56d374SYoshinobu Inoue for (j = 0; j < nalias; j++) 5667d56d374SYoshinobu Inoue if (strcasecmp(*pp, aliases[j]) == 0) 5677d56d374SYoshinobu Inoue break; 5687d56d374SYoshinobu Inoue if (j == nalias) 5697d56d374SYoshinobu Inoue aliases[nalias++] = *pp; 5707d56d374SYoshinobu Inoue } 5717d56d374SYoshinobu Inoue } 5727d56d374SYoshinobu Inoue aliases[nalias] = NULL; 5737d56d374SYoshinobu Inoue #ifdef INET6 5747d56d374SYoshinobu Inoue if (hp1->h_length != hp2->h_length) { 5757d56d374SYoshinobu Inoue hp->h_addrtype = AF_INET6; 5767d56d374SYoshinobu Inoue hp->h_length = sizeof(struct in6_addr); 5777d56d374SYoshinobu Inoue } else { 5787d56d374SYoshinobu Inoue #endif 5797d56d374SYoshinobu Inoue hp->h_addrtype = hp1->h_addrtype; 5807d56d374SYoshinobu Inoue hp->h_length = hp1->h_length; 5817d56d374SYoshinobu Inoue #ifdef INET6 5827d56d374SYoshinobu Inoue } 5837d56d374SYoshinobu Inoue #endif 5847d56d374SYoshinobu Inoue hp->h_addr_list = addrs; 5857d56d374SYoshinobu Inoue naddr = 0; 5867d56d374SYoshinobu Inoue for (i = 1; i <= 2; i++) { 5877d56d374SYoshinobu Inoue if ((pp = HP(i)->h_addr_list) == NULL) 5887d56d374SYoshinobu Inoue continue; 5897d56d374SYoshinobu Inoue if (HP(i)->h_length == hp->h_length) { 5907d56d374SYoshinobu Inoue while (naddr < MAXADDRS && *pp != NULL) 5917d56d374SYoshinobu Inoue addrs[naddr++] = *pp++; 5927d56d374SYoshinobu Inoue } else { 5937d56d374SYoshinobu Inoue /* copy IPv4 addr as mapped IPv6 addr */ 5947d56d374SYoshinobu Inoue while (naddr < MAXADDRS && *pp != NULL) { 5957d56d374SYoshinobu Inoue MAPADDR(&addrbuf[naddr], *pp++); 5967d56d374SYoshinobu Inoue addrs[naddr] = (char *)&addrbuf[naddr]; 5977d56d374SYoshinobu Inoue naddr++; 5987d56d374SYoshinobu Inoue } 5997d56d374SYoshinobu Inoue } 6007d56d374SYoshinobu Inoue } 6017d56d374SYoshinobu Inoue addrs[naddr] = NULL; 6027d56d374SYoshinobu Inoue hp = _hpcopy(hp, errp); 6037d56d374SYoshinobu Inoue freehostent(hp1); 6047d56d374SYoshinobu Inoue freehostent(hp2); 6057d56d374SYoshinobu Inoue return hp; 6067d56d374SYoshinobu Inoue } 6077d56d374SYoshinobu Inoue 6087d56d374SYoshinobu Inoue /* 6097d56d374SYoshinobu Inoue * _hpmapv6: convert IPv4 hostent into IPv4-mapped IPv6 addresses 6107d56d374SYoshinobu Inoue */ 6117d56d374SYoshinobu Inoue #ifdef INET6 6127d56d374SYoshinobu Inoue static struct hostent * 6137d56d374SYoshinobu Inoue _hpmapv6(struct hostent *hp, int *errp) 6147d56d374SYoshinobu Inoue { 6157d56d374SYoshinobu Inoue struct hostent *hp6; 6167d56d374SYoshinobu Inoue 6177d56d374SYoshinobu Inoue if (hp == NULL) 6187d56d374SYoshinobu Inoue return NULL; 6197d56d374SYoshinobu Inoue if (hp->h_addrtype == AF_INET6) 6207d56d374SYoshinobu Inoue return hp; 6217d56d374SYoshinobu Inoue 6227d56d374SYoshinobu Inoue /* make dummy hostent to convert IPv6 address */ 6237d56d374SYoshinobu Inoue if ((hp6 = (struct hostent *)malloc(sizeof(struct hostent))) == NULL) { 6247d56d374SYoshinobu Inoue *errp = TRY_AGAIN; 6257d56d374SYoshinobu Inoue return NULL; 6267d56d374SYoshinobu Inoue } 6277d56d374SYoshinobu Inoue hp6->h_name = NULL; 6287d56d374SYoshinobu Inoue hp6->h_aliases = NULL; 6297d56d374SYoshinobu Inoue hp6->h_addrtype = AF_INET6; 6307d56d374SYoshinobu Inoue hp6->h_length = sizeof(struct in6_addr); 6317d56d374SYoshinobu Inoue hp6->h_addr_list = NULL; 6327d56d374SYoshinobu Inoue return _hpmerge(hp6, hp, errp); 6337d56d374SYoshinobu Inoue } 6347d56d374SYoshinobu Inoue #endif 6357d56d374SYoshinobu Inoue 6367d56d374SYoshinobu Inoue /* 6377d56d374SYoshinobu Inoue * _hpsort: sort address by sortlist 6387d56d374SYoshinobu Inoue */ 6397d56d374SYoshinobu Inoue static struct hostent * 6407d56d374SYoshinobu Inoue _hpsort(struct hostent *hp) 6417d56d374SYoshinobu Inoue { 6427d56d374SYoshinobu Inoue int i, j, n; 6437d56d374SYoshinobu Inoue u_char *ap, *sp, *mp, **pp; 6447d56d374SYoshinobu Inoue char t; 6457d56d374SYoshinobu Inoue char order[MAXADDRS]; 6467d56d374SYoshinobu Inoue int nsort = _res.nsort; 6477d56d374SYoshinobu Inoue 6487d56d374SYoshinobu Inoue if (hp == NULL || hp->h_addr_list[1] == NULL || nsort == 0) 6497d56d374SYoshinobu Inoue return hp; 6507d56d374SYoshinobu Inoue for (i = 0; (ap = (u_char *)hp->h_addr_list[i]); i++) { 6517d56d374SYoshinobu Inoue for (j = 0; j < nsort; j++) { 6527d56d374SYoshinobu Inoue #ifdef INET6 6537d56d374SYoshinobu Inoue if (_res_ext.sort_list[j].af != hp->h_addrtype) 6547d56d374SYoshinobu Inoue continue; 6557d56d374SYoshinobu Inoue sp = (u_char *)&_res_ext.sort_list[j].addr; 6567d56d374SYoshinobu Inoue mp = (u_char *)&_res_ext.sort_list[j].mask; 6577d56d374SYoshinobu Inoue #else 6587d56d374SYoshinobu Inoue sp = (u_char *)&_res.sort_list[j].addr; 6597d56d374SYoshinobu Inoue mp = (u_char *)&_res.sort_list[j].mask; 6607d56d374SYoshinobu Inoue #endif 6617d56d374SYoshinobu Inoue for (n = 0; n < hp->h_length; n++) { 6627d56d374SYoshinobu Inoue if ((ap[n] & mp[n]) != sp[n]) 6637d56d374SYoshinobu Inoue break; 6647d56d374SYoshinobu Inoue } 6657d56d374SYoshinobu Inoue if (n == hp->h_length) 6667d56d374SYoshinobu Inoue break; 6677d56d374SYoshinobu Inoue } 6687d56d374SYoshinobu Inoue order[i] = j; 6697d56d374SYoshinobu Inoue } 6707d56d374SYoshinobu Inoue n = i; 6717d56d374SYoshinobu Inoue pp = (u_char **)hp->h_addr_list; 6727d56d374SYoshinobu Inoue for (i = 0; i < n - 1; i++) { 6737d56d374SYoshinobu Inoue for (j = i + 1; j < n; j++) { 6747d56d374SYoshinobu Inoue if (order[i] > order[j]) { 6757d56d374SYoshinobu Inoue ap = pp[i]; 6767d56d374SYoshinobu Inoue pp[i] = pp[j]; 6777d56d374SYoshinobu Inoue pp[j] = ap; 6787d56d374SYoshinobu Inoue t = order[i]; 6797d56d374SYoshinobu Inoue order[i] = order[j]; 6807d56d374SYoshinobu Inoue order[j] = t; 6817d56d374SYoshinobu Inoue } 6827d56d374SYoshinobu Inoue } 6837d56d374SYoshinobu Inoue } 6847d56d374SYoshinobu Inoue return hp; 6857d56d374SYoshinobu Inoue } 6867d56d374SYoshinobu Inoue 6877d56d374SYoshinobu Inoue static char * 6887d56d374SYoshinobu Inoue _hgetword(char **pp) 6897d56d374SYoshinobu Inoue { 6907d56d374SYoshinobu Inoue char c, *p, *ret; 6917d56d374SYoshinobu Inoue const char *sp; 6927d56d374SYoshinobu Inoue static const char sep[] = "# \t\n"; 6937d56d374SYoshinobu Inoue 6947d56d374SYoshinobu Inoue ret = NULL; 6957d56d374SYoshinobu Inoue for (p = *pp; (c = *p) != '\0'; p++) { 6967d56d374SYoshinobu Inoue for (sp = sep; *sp != '\0'; sp++) { 6977d56d374SYoshinobu Inoue if (c == *sp) 6987d56d374SYoshinobu Inoue break; 6997d56d374SYoshinobu Inoue } 7007d56d374SYoshinobu Inoue if (c == '#') 7017d56d374SYoshinobu Inoue p[1] = '\0'; /* ignore rest of line */ 7027d56d374SYoshinobu Inoue if (ret == NULL) { 7037d56d374SYoshinobu Inoue if (*sp == '\0') 7047d56d374SYoshinobu Inoue ret = p; 7057d56d374SYoshinobu Inoue } else { 7067d56d374SYoshinobu Inoue if (*sp != '\0') { 7077d56d374SYoshinobu Inoue *p++ = '\0'; 7087d56d374SYoshinobu Inoue break; 7097d56d374SYoshinobu Inoue } 7107d56d374SYoshinobu Inoue } 7117d56d374SYoshinobu Inoue } 7127d56d374SYoshinobu Inoue *pp = p; 7137d56d374SYoshinobu Inoue if (ret == NULL || *ret == '\0') 7147d56d374SYoshinobu Inoue return NULL; 7157d56d374SYoshinobu Inoue return ret; 7167d56d374SYoshinobu Inoue } 7177d56d374SYoshinobu Inoue 7187d56d374SYoshinobu Inoue /* 7197d56d374SYoshinobu Inoue * FILES (/etc/hosts) 7207d56d374SYoshinobu Inoue */ 7217d56d374SYoshinobu Inoue 7227d56d374SYoshinobu Inoue static FILE * 7237d56d374SYoshinobu Inoue _files_open(int *errp) 7247d56d374SYoshinobu Inoue { 7257d56d374SYoshinobu Inoue FILE *fp; 7267d56d374SYoshinobu Inoue fp = fopen(_PATH_HOSTS, "r"); 7277d56d374SYoshinobu Inoue if (fp == NULL) 7287d56d374SYoshinobu Inoue *errp = NO_RECOVERY; 7297d56d374SYoshinobu Inoue return fp; 7307d56d374SYoshinobu Inoue } 7317d56d374SYoshinobu Inoue 7327d56d374SYoshinobu Inoue static struct hostent * 7337d56d374SYoshinobu Inoue _files_ghbyname(const char *name, int af, int *errp) 7347d56d374SYoshinobu Inoue { 7357d56d374SYoshinobu Inoue int match, nalias; 7367d56d374SYoshinobu Inoue char *p, *line, *addrstr, *cname; 7377d56d374SYoshinobu Inoue FILE *fp; 7387d56d374SYoshinobu Inoue struct hostent *rethp, *hp, hpbuf; 7397d56d374SYoshinobu Inoue char *aliases[MAXALIASES + 1], *addrs[2]; 7407d56d374SYoshinobu Inoue union inx_addr addrbuf; 7417d56d374SYoshinobu Inoue char buf[BUFSIZ]; 7427d56d374SYoshinobu Inoue 7437d56d374SYoshinobu Inoue if ((fp = _files_open(errp)) == NULL) 7447d56d374SYoshinobu Inoue return NULL; 7457d56d374SYoshinobu Inoue rethp = hp = NULL; 7467d56d374SYoshinobu Inoue 7477d56d374SYoshinobu Inoue while (fgets(buf, sizeof(buf), fp)) { 7487d56d374SYoshinobu Inoue line = buf; 7497d56d374SYoshinobu Inoue if ((addrstr = _hgetword(&line)) == NULL 7507d56d374SYoshinobu Inoue || (cname = _hgetword(&line)) == NULL) 7517d56d374SYoshinobu Inoue continue; 7527d56d374SYoshinobu Inoue match = (strcasecmp(cname, name) == 0); 7537d56d374SYoshinobu Inoue nalias = 0; 7547d56d374SYoshinobu Inoue while ((p = _hgetword(&line)) != NULL) { 7557d56d374SYoshinobu Inoue if (!match) 7567d56d374SYoshinobu Inoue match = (strcasecmp(p, name) == 0); 7577d56d374SYoshinobu Inoue if (nalias < MAXALIASES) 7587d56d374SYoshinobu Inoue aliases[nalias++] = p; 7597d56d374SYoshinobu Inoue } 7607d56d374SYoshinobu Inoue if (!match) 7617d56d374SYoshinobu Inoue continue; 762be26adb5SYoshinobu Inoue if ((af == AF_INET 763be26adb5SYoshinobu Inoue ? inet_aton(addrstr, (struct in_addr *)&addrbuf) 764be26adb5SYoshinobu Inoue : inet_pton(af, addrstr, &addrbuf)) != 1) { 7657d56d374SYoshinobu Inoue *errp = NO_DATA; /* name found */ 7667d56d374SYoshinobu Inoue continue; 7677d56d374SYoshinobu Inoue } 7687d56d374SYoshinobu Inoue hp = &hpbuf; 7697d56d374SYoshinobu Inoue hp->h_name = cname; 7707d56d374SYoshinobu Inoue hp->h_aliases = aliases; 7717d56d374SYoshinobu Inoue aliases[nalias] = NULL; 7727d56d374SYoshinobu Inoue hp->h_addrtype = af; 7737d56d374SYoshinobu Inoue hp->h_length = ADDRLEN(af); 7747d56d374SYoshinobu Inoue hp->h_addr_list = addrs; 7757d56d374SYoshinobu Inoue addrs[0] = (char *)&addrbuf; 7767d56d374SYoshinobu Inoue addrs[1] = NULL; 7777d56d374SYoshinobu Inoue hp = _hpcopy(hp, errp); 7787d56d374SYoshinobu Inoue rethp = _hpmerge(rethp, hp, errp); 7797d56d374SYoshinobu Inoue } 7807d56d374SYoshinobu Inoue fclose(fp); 7817d56d374SYoshinobu Inoue return rethp; 7827d56d374SYoshinobu Inoue } 7837d56d374SYoshinobu Inoue 7847d56d374SYoshinobu Inoue static struct hostent * 7857d56d374SYoshinobu Inoue _files_ghbyaddr(const void *addr, int addrlen, int af, int *errp) 7867d56d374SYoshinobu Inoue { 7877d56d374SYoshinobu Inoue int nalias; 7887d56d374SYoshinobu Inoue char *p, *line; 7897d56d374SYoshinobu Inoue FILE *fp; 7907d56d374SYoshinobu Inoue struct hostent *hp, hpbuf; 7917d56d374SYoshinobu Inoue char *aliases[MAXALIASES + 1], *addrs[2]; 7927d56d374SYoshinobu Inoue union inx_addr addrbuf; 7937d56d374SYoshinobu Inoue char buf[BUFSIZ]; 7947d56d374SYoshinobu Inoue 7957d56d374SYoshinobu Inoue if ((fp = _files_open(errp)) == NULL) 7967d56d374SYoshinobu Inoue return NULL; 7977d56d374SYoshinobu Inoue hp = NULL; 7987d56d374SYoshinobu Inoue while (fgets(buf, sizeof(buf), fp)) { 7997d56d374SYoshinobu Inoue line = buf; 8007d56d374SYoshinobu Inoue if ((p = _hgetword(&line)) == NULL 801be26adb5SYoshinobu Inoue || (af == AF_INET 802be26adb5SYoshinobu Inoue ? inet_aton(p, (struct in_addr *)&addrbuf) 803be26adb5SYoshinobu Inoue : inet_pton(af, p, &addrbuf)) != 1 8047d56d374SYoshinobu Inoue || memcmp(addr, &addrbuf, addrlen) != 0 8057d56d374SYoshinobu Inoue || (p = _hgetword(&line)) == NULL) 8067d56d374SYoshinobu Inoue continue; 8077d56d374SYoshinobu Inoue hp = &hpbuf; 8087d56d374SYoshinobu Inoue hp->h_name = p; 8097d56d374SYoshinobu Inoue hp->h_aliases = aliases; 8107d56d374SYoshinobu Inoue nalias = 0; 8117d56d374SYoshinobu Inoue while ((p = _hgetword(&line)) != NULL) { 8127d56d374SYoshinobu Inoue if (nalias < MAXALIASES) 8137d56d374SYoshinobu Inoue aliases[nalias++] = p; 8147d56d374SYoshinobu Inoue } 8157d56d374SYoshinobu Inoue aliases[nalias] = NULL; 8167d56d374SYoshinobu Inoue hp->h_addrtype = af; 8177d56d374SYoshinobu Inoue hp->h_length = addrlen; 8187d56d374SYoshinobu Inoue hp->h_addr_list = addrs; 8197d56d374SYoshinobu Inoue addrs[0] = (char *)&addrbuf; 8207d56d374SYoshinobu Inoue addrs[1] = NULL; 8217d56d374SYoshinobu Inoue hp = _hpcopy(hp, errp); 8227d56d374SYoshinobu Inoue break; 8237d56d374SYoshinobu Inoue } 8247d56d374SYoshinobu Inoue fclose(fp); 8257d56d374SYoshinobu Inoue return hp; 8267d56d374SYoshinobu Inoue } 8277d56d374SYoshinobu Inoue 8287d56d374SYoshinobu Inoue #ifdef DEBUG 8297d56d374SYoshinobu Inoue #define DNS_ASSERT(X) if (!(X)) { fprintf(stderr, "ASSFAIL: %s %d: %s\n", __FILE__, __LINE__, #X); goto badanswer; } 8307d56d374SYoshinobu Inoue #else 8317d56d374SYoshinobu Inoue #define DNS_ASSERT(X) if (!(X)) { goto badanswer; } 8327d56d374SYoshinobu Inoue #endif 8337d56d374SYoshinobu Inoue 8347d56d374SYoshinobu Inoue static struct hostent * 8357d56d374SYoshinobu Inoue _dns_ghbyname(const char *name, int af, int *errp) 8367d56d374SYoshinobu Inoue { 8377d56d374SYoshinobu Inoue int n; 8387d56d374SYoshinobu Inoue u_char answer[BUFSIZ]; 8397d56d374SYoshinobu Inoue char tbuf[MAXDNAME+1]; 8407d56d374SYoshinobu Inoue HEADER *hp; 8417d56d374SYoshinobu Inoue u_char *cp, *eom; 8427d56d374SYoshinobu Inoue int qtype; 8437d56d374SYoshinobu Inoue int type, class, ancount, qdcount; 8447d56d374SYoshinobu Inoue u_long ttl; 8457d56d374SYoshinobu Inoue char hostbuf[BUFSIZ]; 8467d56d374SYoshinobu Inoue char *bp; 8477d56d374SYoshinobu Inoue char *alist[MAXALIASES]; 8487d56d374SYoshinobu Inoue char *hlist[MAXADDRS]; 8497d56d374SYoshinobu Inoue struct hostent hbuf; 8507d56d374SYoshinobu Inoue int buflen; 8517d56d374SYoshinobu Inoue int na, nh; 8527d56d374SYoshinobu Inoue 8537d56d374SYoshinobu Inoue if ((_res.options & RES_INIT) == 0) { 8547d56d374SYoshinobu Inoue if (res_init() < 0) { 8557d56d374SYoshinobu Inoue *errp = h_errno; 8567d56d374SYoshinobu Inoue return NULL; 8577d56d374SYoshinobu Inoue } 8587d56d374SYoshinobu Inoue } 8597d56d374SYoshinobu Inoue hbuf.h_aliases = alist; 8607d56d374SYoshinobu Inoue hbuf.h_addrtype = af; 8617d56d374SYoshinobu Inoue hbuf.h_length = ADDRLEN(af); 8627d56d374SYoshinobu Inoue hbuf.h_addr_list = hlist; 8637d56d374SYoshinobu Inoue na = nh = 0; 8647d56d374SYoshinobu Inoue 8657d56d374SYoshinobu Inoue #ifdef INET6 8667d56d374SYoshinobu Inoue qtype = (af == AF_INET6 ? T_AAAA : T_A); 8677d56d374SYoshinobu Inoue #else 8687d56d374SYoshinobu Inoue qtype = T_A; 8697d56d374SYoshinobu Inoue #endif 8707d56d374SYoshinobu Inoue n = res_search(name, C_IN, qtype, answer, sizeof(answer)); 8717d56d374SYoshinobu Inoue if (n < 0) { 8727d56d374SYoshinobu Inoue *errp = h_errno; 8737d56d374SYoshinobu Inoue return NULL; 8747d56d374SYoshinobu Inoue } 8757d56d374SYoshinobu Inoue hp = (HEADER *)answer; 8767d56d374SYoshinobu Inoue eom = answer + n; 8777d56d374SYoshinobu Inoue ancount = ntohs(hp->ancount); 8787d56d374SYoshinobu Inoue qdcount = ntohs(hp->qdcount); 8797d56d374SYoshinobu Inoue DNS_ASSERT(qdcount == 1); 8807d56d374SYoshinobu Inoue cp = answer + sizeof(HEADER); 8817d56d374SYoshinobu Inoue bp = hostbuf; 8827d56d374SYoshinobu Inoue buflen = sizeof(hostbuf); 8837d56d374SYoshinobu Inoue 8847d56d374SYoshinobu Inoue n = dn_expand(answer, eom, cp, bp, buflen); 8857d56d374SYoshinobu Inoue DNS_ASSERT(n >= 0); 8867d56d374SYoshinobu Inoue cp += n + QFIXEDSZ; 8877d56d374SYoshinobu Inoue hbuf.h_name = bp; 8887d56d374SYoshinobu Inoue n = strlen(bp) + 1; 8897d56d374SYoshinobu Inoue bp += n; 8907d56d374SYoshinobu Inoue buflen -= n; 8917d56d374SYoshinobu Inoue while (ancount-- > 0 && cp < eom) { 8927d56d374SYoshinobu Inoue n = dn_expand(answer, eom, cp, bp, buflen); 8937d56d374SYoshinobu Inoue DNS_ASSERT(n >= 0); 8947d56d374SYoshinobu Inoue cp += n; /* name */ 8957d56d374SYoshinobu Inoue type = _getshort(cp); 8967d56d374SYoshinobu Inoue cp += 2; /* type */ 8977d56d374SYoshinobu Inoue class = _getshort(cp); 8987d56d374SYoshinobu Inoue cp += 2; /* class */ 8997d56d374SYoshinobu Inoue ttl = _getlong(cp); 9007d56d374SYoshinobu Inoue cp += 4; /* ttl */ 9017d56d374SYoshinobu Inoue n = _getshort(cp); 9027d56d374SYoshinobu Inoue cp += 2; /* len */ 9037d56d374SYoshinobu Inoue DNS_ASSERT(class == C_IN); 9047d56d374SYoshinobu Inoue switch (type) { 9057d56d374SYoshinobu Inoue case T_CNAME: 9067d56d374SYoshinobu Inoue if (na >= MAXALIASES-1) { 9077d56d374SYoshinobu Inoue cp += n; 9087d56d374SYoshinobu Inoue break; 9097d56d374SYoshinobu Inoue } 9107d56d374SYoshinobu Inoue n = dn_expand(answer, eom, cp, tbuf, sizeof(tbuf)); 9117d56d374SYoshinobu Inoue DNS_ASSERT(n >= 0); 9127d56d374SYoshinobu Inoue cp += n; 9137d56d374SYoshinobu Inoue /* alias */ 9147d56d374SYoshinobu Inoue alist[na++] = bp; 9157d56d374SYoshinobu Inoue n = strlen(bp) + 1; 9167d56d374SYoshinobu Inoue bp += n; 9177d56d374SYoshinobu Inoue buflen -= n; 9187d56d374SYoshinobu Inoue /* canon */ 9197d56d374SYoshinobu Inoue n = strlen(tbuf) + 1; 9207d56d374SYoshinobu Inoue DNS_ASSERT(n < buflen); 9217d56d374SYoshinobu Inoue strcpy(bp, tbuf); 9227d56d374SYoshinobu Inoue hbuf.h_name = bp; 9237d56d374SYoshinobu Inoue bp += n; 9247d56d374SYoshinobu Inoue buflen -= n; 9257d56d374SYoshinobu Inoue break; 9267d56d374SYoshinobu Inoue case T_A: 9277d56d374SYoshinobu Inoue #ifdef INET6 9287d56d374SYoshinobu Inoue case T_AAAA: 9297d56d374SYoshinobu Inoue #endif 9307d56d374SYoshinobu Inoue DNS_ASSERT(type == qtype); 9317d56d374SYoshinobu Inoue bp = (char *)ALIGN(bp); 9327d56d374SYoshinobu Inoue DNS_ASSERT(n == hbuf.h_length); 9337d56d374SYoshinobu Inoue DNS_ASSERT(n < buflen); 9347d56d374SYoshinobu Inoue if (nh < MAXADDRS-1) { 9357d56d374SYoshinobu Inoue hlist[nh++] = bp; 9367d56d374SYoshinobu Inoue memcpy(bp, cp, n); 9377d56d374SYoshinobu Inoue bp += n; 9387d56d374SYoshinobu Inoue buflen -= n; 9397d56d374SYoshinobu Inoue } 9407d56d374SYoshinobu Inoue cp += n; 9417d56d374SYoshinobu Inoue break; 9427d56d374SYoshinobu Inoue default: 9437d56d374SYoshinobu Inoue DNS_ASSERT(0); 9447d56d374SYoshinobu Inoue cp += n; 9457d56d374SYoshinobu Inoue break; 9467d56d374SYoshinobu Inoue } 9477d56d374SYoshinobu Inoue } 9487d56d374SYoshinobu Inoue if (nh == 0) { 9497d56d374SYoshinobu Inoue badanswer: 9507d56d374SYoshinobu Inoue *errp = NO_RECOVERY; 9517d56d374SYoshinobu Inoue return NULL; 9527d56d374SYoshinobu Inoue } 9537d56d374SYoshinobu Inoue alist[na] = NULL; 9547d56d374SYoshinobu Inoue hlist[nh] = NULL; 9557d56d374SYoshinobu Inoue return _hpcopy(&hbuf, errp); 9567d56d374SYoshinobu Inoue } 9577d56d374SYoshinobu Inoue 9587d56d374SYoshinobu Inoue static struct hostent * 9597d56d374SYoshinobu Inoue _dns_ghbyaddr(const void *addr, int addrlen, int af, int *errp) 9607d56d374SYoshinobu Inoue { 9617d56d374SYoshinobu Inoue int n; 9627d56d374SYoshinobu Inoue u_char answer[BUFSIZ]; 9637d56d374SYoshinobu Inoue HEADER *hp; 9647d56d374SYoshinobu Inoue u_char c, *cp, *eom; 9657d56d374SYoshinobu Inoue int type, class, ancount, qdcount; 9667d56d374SYoshinobu Inoue u_long ttl; 9677d56d374SYoshinobu Inoue char hostbuf[BUFSIZ]; 9687d56d374SYoshinobu Inoue char *bp; 9697d56d374SYoshinobu Inoue char *alist[MAXALIASES]; 9707d56d374SYoshinobu Inoue char *hlist[2]; 9717d56d374SYoshinobu Inoue struct hostent hbuf; 9727d56d374SYoshinobu Inoue int buflen; 9737d56d374SYoshinobu Inoue int na; 9747d56d374SYoshinobu Inoue #ifdef INET6 9757d56d374SYoshinobu Inoue static const char hex[] = "0123456789abcdef"; 9767d56d374SYoshinobu Inoue #endif 9777d56d374SYoshinobu Inoue 9787d56d374SYoshinobu Inoue #ifdef INET6 9797d56d374SYoshinobu Inoue /* XXX */ 9807d56d374SYoshinobu Inoue if (af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)addr)) 9817d56d374SYoshinobu Inoue return NULL; 9827d56d374SYoshinobu Inoue #endif 9837d56d374SYoshinobu Inoue 9847d56d374SYoshinobu Inoue if ((_res.options & RES_INIT) == 0) { 9857d56d374SYoshinobu Inoue if (res_init() < 0) { 9867d56d374SYoshinobu Inoue *errp = h_errno; 9877d56d374SYoshinobu Inoue return NULL; 9887d56d374SYoshinobu Inoue } 9897d56d374SYoshinobu Inoue } 9907d56d374SYoshinobu Inoue hbuf.h_name = NULL; 9917d56d374SYoshinobu Inoue hbuf.h_aliases = alist; 9927d56d374SYoshinobu Inoue hbuf.h_addrtype = af; 9937d56d374SYoshinobu Inoue hbuf.h_length = addrlen; 9947d56d374SYoshinobu Inoue hbuf.h_addr_list = hlist; 9957d56d374SYoshinobu Inoue hlist[0] = (char *)addr; 9967d56d374SYoshinobu Inoue hlist[1] = NULL; 9977d56d374SYoshinobu Inoue na = 0; 9987d56d374SYoshinobu Inoue 9997d56d374SYoshinobu Inoue n = 0; 10007d56d374SYoshinobu Inoue bp = hostbuf; 10017d56d374SYoshinobu Inoue cp = (u_char *)addr+addrlen-1; 10027d56d374SYoshinobu Inoue switch (af) { 10037d56d374SYoshinobu Inoue #ifdef INET6 10047d56d374SYoshinobu Inoue case AF_INET6: 10057d56d374SYoshinobu Inoue for (; n < addrlen; n++, cp--) { 10067d56d374SYoshinobu Inoue c = *cp; 10077d56d374SYoshinobu Inoue *bp++ = hex[c & 0xf]; 10087d56d374SYoshinobu Inoue *bp++ = '.'; 10097d56d374SYoshinobu Inoue *bp++ = hex[c >> 4]; 10107d56d374SYoshinobu Inoue *bp++ = '.'; 10117d56d374SYoshinobu Inoue } 10127d56d374SYoshinobu Inoue strcpy(bp, "ip6.int"); 10137d56d374SYoshinobu Inoue break; 10147d56d374SYoshinobu Inoue #endif 10157d56d374SYoshinobu Inoue default: 10167d56d374SYoshinobu Inoue for (; n < addrlen; n++, cp--) { 10177d56d374SYoshinobu Inoue c = *cp; 10187d56d374SYoshinobu Inoue if (c >= 100) 10197d56d374SYoshinobu Inoue *bp++ = '0' + c / 100; 10207d56d374SYoshinobu Inoue if (c >= 10) 10217d56d374SYoshinobu Inoue *bp++ = '0' + (c % 100) / 10; 10227d56d374SYoshinobu Inoue *bp++ = '0' + c % 10; 10237d56d374SYoshinobu Inoue *bp++ = '.'; 10247d56d374SYoshinobu Inoue } 10257d56d374SYoshinobu Inoue strcpy(bp, "in-addr.arpa"); 10267d56d374SYoshinobu Inoue break; 10277d56d374SYoshinobu Inoue } 10287d56d374SYoshinobu Inoue 10297d56d374SYoshinobu Inoue n = res_query(hostbuf, C_IN, T_PTR, answer, sizeof(answer)); 10307d56d374SYoshinobu Inoue if (n < 0) { 10317d56d374SYoshinobu Inoue *errp = h_errno; 10327d56d374SYoshinobu Inoue return NULL; 10337d56d374SYoshinobu Inoue } 10347d56d374SYoshinobu Inoue hp = (HEADER *)answer; 10357d56d374SYoshinobu Inoue eom = answer + n; 10367d56d374SYoshinobu Inoue ancount = ntohs(hp->ancount); 10377d56d374SYoshinobu Inoue qdcount = ntohs(hp->qdcount); 10387d56d374SYoshinobu Inoue DNS_ASSERT(qdcount == 1); 10397d56d374SYoshinobu Inoue cp = answer + sizeof(HEADER); 10407d56d374SYoshinobu Inoue bp = hostbuf; 10417d56d374SYoshinobu Inoue buflen = sizeof(hostbuf); 10427d56d374SYoshinobu Inoue 10437d56d374SYoshinobu Inoue n = dn_expand(answer, eom, cp, bp, buflen); 10447d56d374SYoshinobu Inoue DNS_ASSERT(n >= 0); 10457d56d374SYoshinobu Inoue cp += n + QFIXEDSZ; 10467d56d374SYoshinobu Inoue while (ancount-- > 0 && cp < eom) { 10477d56d374SYoshinobu Inoue n = dn_expand(answer, eom, cp, bp, buflen); 10487d56d374SYoshinobu Inoue DNS_ASSERT(n >= 0); 10497d56d374SYoshinobu Inoue cp += n; /* name */ 10507d56d374SYoshinobu Inoue type = _getshort(cp); 10517d56d374SYoshinobu Inoue cp += 2; /* type */ 10527d56d374SYoshinobu Inoue class = _getshort(cp); 10537d56d374SYoshinobu Inoue cp += 2; /* class */ 10547d56d374SYoshinobu Inoue ttl = _getlong(cp); 10557d56d374SYoshinobu Inoue cp += 4; /* ttl */ 10567d56d374SYoshinobu Inoue n = _getshort(cp); 10577d56d374SYoshinobu Inoue cp += 2; /* len */ 10587d56d374SYoshinobu Inoue DNS_ASSERT(class == C_IN); 10597d56d374SYoshinobu Inoue switch (type) { 10607d56d374SYoshinobu Inoue case T_PTR: 10617d56d374SYoshinobu Inoue n = dn_expand(answer, eom, cp, bp, buflen); 10627d56d374SYoshinobu Inoue DNS_ASSERT(n >= 0); 10637d56d374SYoshinobu Inoue cp += n; 10647d56d374SYoshinobu Inoue if (na >= MAXALIASES-1) 10657d56d374SYoshinobu Inoue break; 10667d56d374SYoshinobu Inoue if (hbuf.h_name == NULL) 10677d56d374SYoshinobu Inoue hbuf.h_name = bp; 10687d56d374SYoshinobu Inoue else 10697d56d374SYoshinobu Inoue alist[na++] = bp; 10707d56d374SYoshinobu Inoue n = strlen(bp) + 1; 10717d56d374SYoshinobu Inoue bp += n; 10727d56d374SYoshinobu Inoue buflen -= n; 10737d56d374SYoshinobu Inoue break; 10747d56d374SYoshinobu Inoue case T_CNAME: 10757d56d374SYoshinobu Inoue cp += n; 10767d56d374SYoshinobu Inoue break; 10777d56d374SYoshinobu Inoue default: 10787d56d374SYoshinobu Inoue badanswer: 10797d56d374SYoshinobu Inoue *errp = NO_RECOVERY; 10807d56d374SYoshinobu Inoue return NULL; 10817d56d374SYoshinobu Inoue } 10827d56d374SYoshinobu Inoue } 10837d56d374SYoshinobu Inoue if (hbuf.h_name == NULL) { 10847d56d374SYoshinobu Inoue *errp = h_errno; 10857d56d374SYoshinobu Inoue return NULL; 10867d56d374SYoshinobu Inoue } 10877d56d374SYoshinobu Inoue alist[na] = NULL; 10887d56d374SYoshinobu Inoue return _hpcopy(&hbuf, errp); 10897d56d374SYoshinobu Inoue } 10907d56d374SYoshinobu Inoue 10917d56d374SYoshinobu Inoue #ifdef ICMPNL 10927d56d374SYoshinobu Inoue 10937d56d374SYoshinobu Inoue /* 10947d56d374SYoshinobu Inoue * experimental: 10957d56d374SYoshinobu Inoue * draft-ietf-ipngwg-icmp-namelookups-02.txt 10967d56d374SYoshinobu Inoue * ifindex is assumed to be encoded in addr. 10977d56d374SYoshinobu Inoue */ 10987d56d374SYoshinobu Inoue #include <sys/uio.h> 10997d56d374SYoshinobu Inoue #include <netinet/ip6.h> 11007d56d374SYoshinobu Inoue #include <netinet/icmp6.h> 11017d56d374SYoshinobu Inoue 11027d56d374SYoshinobu Inoue struct _icmp_host_cache { 11037d56d374SYoshinobu Inoue struct _icmp_host_cache *hc_next; 11047d56d374SYoshinobu Inoue int hc_ifindex; 11057d56d374SYoshinobu Inoue struct in6_addr hc_addr; 11067d56d374SYoshinobu Inoue char *hc_name; 11077d56d374SYoshinobu Inoue }; 11087d56d374SYoshinobu Inoue 11097d56d374SYoshinobu Inoue static char * 11107d56d374SYoshinobu Inoue _icmp_fqdn_query(const struct in6_addr *addr, int ifindex) 11117d56d374SYoshinobu Inoue { 11127d56d374SYoshinobu Inoue int s; 11137d56d374SYoshinobu Inoue struct icmp6_filter filter; 11147d56d374SYoshinobu Inoue struct msghdr msg; 11157d56d374SYoshinobu Inoue struct cmsghdr *cmsg; 11167d56d374SYoshinobu Inoue struct in6_pktinfo *pkt; 11177d56d374SYoshinobu Inoue char cbuf[256]; 11187d56d374SYoshinobu Inoue char buf[1024]; 11197d56d374SYoshinobu Inoue int cc; 11207d56d374SYoshinobu Inoue struct icmp6_fqdn_query *fq; 11217d56d374SYoshinobu Inoue struct icmp6_fqdn_reply *fr; 11227d56d374SYoshinobu Inoue struct _icmp_host_cache *hc; 11237d56d374SYoshinobu Inoue struct sockaddr_in6 sin6; 11247d56d374SYoshinobu Inoue struct iovec iov; 11257d56d374SYoshinobu Inoue fd_set s_fds, fds; 11267d56d374SYoshinobu Inoue struct timeval tout; 11277d56d374SYoshinobu Inoue int len; 11287d56d374SYoshinobu Inoue char *name; 11297d56d374SYoshinobu Inoue static int pid; 11307d56d374SYoshinobu Inoue static struct _icmp_host_cache *hc_head; 11317d56d374SYoshinobu Inoue 11327d56d374SYoshinobu Inoue for (hc = hc_head; hc; hc = hc->hc_next) { 11337d56d374SYoshinobu Inoue if (hc->hc_ifindex == ifindex 11347d56d374SYoshinobu Inoue && IN6_ARE_ADDR_EQUAL(&hc->hc_addr, addr)) 11357d56d374SYoshinobu Inoue return hc->hc_name; 11367d56d374SYoshinobu Inoue } 11377d56d374SYoshinobu Inoue 11387d56d374SYoshinobu Inoue if (pid == 0) 11397d56d374SYoshinobu Inoue pid = getpid(); 11407d56d374SYoshinobu Inoue 11417d56d374SYoshinobu Inoue ICMP6_FILTER_SETBLOCKALL(&filter); 11427d56d374SYoshinobu Inoue ICMP6_FILTER_SETPASS(ICMP6_FQDN_REPLY, &filter); 11437d56d374SYoshinobu Inoue 11447d56d374SYoshinobu Inoue FD_ZERO(&s_fds); 11457d56d374SYoshinobu Inoue tout.tv_sec = 0; 11467d56d374SYoshinobu Inoue tout.tv_usec = 200000; /*XXX: 200ms*/ 11477d56d374SYoshinobu Inoue 11487d56d374SYoshinobu Inoue fq = (struct icmp6_fqdn_query *)buf; 11497d56d374SYoshinobu Inoue fq->icmp6_fqdn_type = ICMP6_FQDN_QUERY; 11507d56d374SYoshinobu Inoue fq->icmp6_fqdn_code = 0; 11517d56d374SYoshinobu Inoue fq->icmp6_fqdn_cksum = 0; 11527d56d374SYoshinobu Inoue fq->icmp6_fqdn_id = (u_short)pid; 11537d56d374SYoshinobu Inoue fq->icmp6_fqdn_unused = 0; 11547d56d374SYoshinobu Inoue fq->icmp6_fqdn_cookie[0] = 0; 11557d56d374SYoshinobu Inoue fq->icmp6_fqdn_cookie[1] = 0; 11567d56d374SYoshinobu Inoue 11577d56d374SYoshinobu Inoue memset(&sin6, 0, sizeof(sin6)); 11587d56d374SYoshinobu Inoue sin6.sin6_family = AF_INET6; 11597d56d374SYoshinobu Inoue sin6.sin6_addr = *addr; 11607d56d374SYoshinobu Inoue 11617d56d374SYoshinobu Inoue memset(&msg, 0, sizeof(msg)); 11627d56d374SYoshinobu Inoue msg.msg_name = (caddr_t)&sin6; 11637d56d374SYoshinobu Inoue msg.msg_namelen = sizeof(sin6); 11647d56d374SYoshinobu Inoue msg.msg_iov = &iov; 11657d56d374SYoshinobu Inoue msg.msg_iovlen = 1; 11667d56d374SYoshinobu Inoue msg.msg_control = NULL; 11677d56d374SYoshinobu Inoue msg.msg_controllen = 0; 11687d56d374SYoshinobu Inoue iov.iov_base = (caddr_t)buf; 11697d56d374SYoshinobu Inoue iov.iov_len = sizeof(struct icmp6_fqdn_query); 11707d56d374SYoshinobu Inoue 11717d56d374SYoshinobu Inoue if (ifindex) { 11727d56d374SYoshinobu Inoue msg.msg_control = cbuf; 11737d56d374SYoshinobu Inoue msg.msg_controllen = sizeof(cbuf); 11747d56d374SYoshinobu Inoue cmsg = CMSG_FIRSTHDR(&msg); 11757d56d374SYoshinobu Inoue cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 11767d56d374SYoshinobu Inoue cmsg->cmsg_level = IPPROTO_IPV6; 11777d56d374SYoshinobu Inoue cmsg->cmsg_type = IPV6_PKTINFO; 11787d56d374SYoshinobu Inoue pkt = (struct in6_pktinfo *)&cmsg[1]; 11797d56d374SYoshinobu Inoue memset(&pkt->ipi6_addr, 0, sizeof(struct in6_addr)); 11807d56d374SYoshinobu Inoue pkt->ipi6_ifindex = ifindex; 11817d56d374SYoshinobu Inoue cmsg = CMSG_NXTHDR(&msg, cmsg); 11827d56d374SYoshinobu Inoue msg.msg_controllen = (char *)cmsg - cbuf; 11837d56d374SYoshinobu Inoue } 11847d56d374SYoshinobu Inoue 11857d56d374SYoshinobu Inoue if ((s = socket(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) 11867d56d374SYoshinobu Inoue return NULL; 11877d56d374SYoshinobu Inoue (void)setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, 11887d56d374SYoshinobu Inoue (char *)&filter, sizeof(filter)); 11897d56d374SYoshinobu Inoue cc = sendmsg(s, &msg, 0); 11907d56d374SYoshinobu Inoue if (cc < 0) { 11919233c4d9SJason Evans _close(s); 11927d56d374SYoshinobu Inoue return NULL; 11937d56d374SYoshinobu Inoue } 11947d56d374SYoshinobu Inoue FD_SET(s, &s_fds); 11957d56d374SYoshinobu Inoue for (;;) { 11967d56d374SYoshinobu Inoue fds = s_fds; 11977d56d374SYoshinobu Inoue if (select(s + 1, &fds, NULL, NULL, &tout) <= 0) { 11989233c4d9SJason Evans _close(s); 11997d56d374SYoshinobu Inoue return NULL; 12007d56d374SYoshinobu Inoue } 12017d56d374SYoshinobu Inoue len = sizeof(sin6); 12027d56d374SYoshinobu Inoue cc = recvfrom(s, buf, sizeof(buf), 0, 12037d56d374SYoshinobu Inoue (struct sockaddr *)&sin6, &len); 12047d56d374SYoshinobu Inoue if (cc <= 0) { 12059233c4d9SJason Evans _close(s); 12067d56d374SYoshinobu Inoue return NULL; 12077d56d374SYoshinobu Inoue } 12087d56d374SYoshinobu Inoue if (cc < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) 12097d56d374SYoshinobu Inoue continue; 12107d56d374SYoshinobu Inoue if (!IN6_ARE_ADDR_EQUAL(addr, &sin6.sin6_addr)) 12117d56d374SYoshinobu Inoue continue; 12127d56d374SYoshinobu Inoue fr = (struct icmp6_fqdn_reply *)(buf + sizeof(struct ip6_hdr)); 12137d56d374SYoshinobu Inoue if (fr->icmp6_fqdn_type == ICMP6_FQDN_REPLY) 12147d56d374SYoshinobu Inoue break; 12157d56d374SYoshinobu Inoue } 12169233c4d9SJason Evans _close(s); 12177d56d374SYoshinobu Inoue if (fr->icmp6_fqdn_cookie[1] != 0) { 12187d56d374SYoshinobu Inoue /* rfc1788 type */ 12197d56d374SYoshinobu Inoue name = buf + sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 4; 12207d56d374SYoshinobu Inoue len = (buf + cc) - name; 12217d56d374SYoshinobu Inoue } else { 12227d56d374SYoshinobu Inoue len = fr->icmp6_fqdn_namelen; 12237d56d374SYoshinobu Inoue name = fr->icmp6_fqdn_name; 12247d56d374SYoshinobu Inoue } 12257d56d374SYoshinobu Inoue if (len <= 0) 12267d56d374SYoshinobu Inoue return NULL; 12277d56d374SYoshinobu Inoue name[len] = 0; 12287d56d374SYoshinobu Inoue 12297d56d374SYoshinobu Inoue if ((hc = (struct _icmp_host_cache *)malloc(sizeof(*hc))) == NULL) 12307d56d374SYoshinobu Inoue return NULL; 12317d56d374SYoshinobu Inoue /* XXX: limit number of cached entries */ 12327d56d374SYoshinobu Inoue hc->hc_ifindex = ifindex; 12337d56d374SYoshinobu Inoue hc->hc_addr = *addr; 12347d56d374SYoshinobu Inoue hc->hc_name = strdup(name); 12357d56d374SYoshinobu Inoue hc->hc_next = hc_head; 12367d56d374SYoshinobu Inoue hc_head = hc; 12377d56d374SYoshinobu Inoue return hc->hc_name; 12387d56d374SYoshinobu Inoue } 12397d56d374SYoshinobu Inoue 12407d56d374SYoshinobu Inoue static struct hostent * 12417d56d374SYoshinobu Inoue _icmp_ghbyaddr(const void *addr, int addrlen, int af, int *errp) 12427d56d374SYoshinobu Inoue { 12437d56d374SYoshinobu Inoue char *hname; 12447d56d374SYoshinobu Inoue int ifindex; 12457d56d374SYoshinobu Inoue struct in6_addr addr6; 12467d56d374SYoshinobu Inoue 12477d56d374SYoshinobu Inoue if (af != AF_INET6) { 12487d56d374SYoshinobu Inoue /* 12497d56d374SYoshinobu Inoue * Note: rfc1788 defines Who Are You for IPv4, 12507d56d374SYoshinobu Inoue * but no one implements it. 12517d56d374SYoshinobu Inoue */ 12527d56d374SYoshinobu Inoue return NULL; 12537d56d374SYoshinobu Inoue } 12547d56d374SYoshinobu Inoue 12557d56d374SYoshinobu Inoue memcpy(&addr6, addr, addrlen); 12567d56d374SYoshinobu Inoue ifindex = (addr6.s6_addr[2] << 8) | addr6.s6_addr[3]; 12577d56d374SYoshinobu Inoue addr6.s6_addr[2] = addr6.s6_addr[3] = 0; 12587d56d374SYoshinobu Inoue 12597d56d374SYoshinobu Inoue if (!IN6_IS_ADDR_LINKLOCAL(&addr6)) 12607d56d374SYoshinobu Inoue return NULL; /*XXX*/ 12617d56d374SYoshinobu Inoue 12627d56d374SYoshinobu Inoue if ((hname = _icmp_fqdn_query(&addr6, ifindex)) == NULL) 12637d56d374SYoshinobu Inoue return NULL; 12647d56d374SYoshinobu Inoue return _hpaddr(af, hname, &addr6, errp); 12657d56d374SYoshinobu Inoue } 12667d56d374SYoshinobu Inoue #endif /* ICMPNL */ 1267