getaddrinfo.c revision 160593
1121474Sume/* $KAME: getaddrinfo.c,v 1.15 2000/07/09 04:37:24 itojun Exp $ */ 262614Sitojun 355163Sshin/* 455163Sshin * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 555163Sshin * All rights reserved. 655163Sshin * 755163Sshin * Redistribution and use in source and binary forms, with or without 855163Sshin * modification, are permitted provided that the following conditions 955163Sshin * are met: 1055163Sshin * 1. Redistributions of source code must retain the above copyright 1155163Sshin * notice, this list of conditions and the following disclaimer. 1255163Sshin * 2. Redistributions in binary form must reproduce the above copyright 1355163Sshin * notice, this list of conditions and the following disclaimer in the 1455163Sshin * documentation and/or other materials provided with the distribution. 1555163Sshin * 3. Neither the name of the project nor the names of its contributors 1655163Sshin * may be used to endorse or promote products derived from this software 1755163Sshin * without specific prior written permission. 1855163Sshin * 1955163Sshin * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2055163Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2155163Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2255163Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2355163Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2455163Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2555163Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2655163Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2755163Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2855163Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2955163Sshin * SUCH DAMAGE. 3055163Sshin */ 3155163Sshin 3255163Sshin/* 3355163Sshin * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator. 3455163Sshin * 3555163Sshin * Issues to be discussed: 3655163Sshin * - Return values. There are nonstandard return values defined and used 3755163Sshin * in the source code. This is because RFC2553 is silent about which error 3855163Sshin * code must be returned for which situation. 3961877Sume * - freeaddrinfo(NULL). RFC2553 is silent about it. XNET 5.2 says it is 40105940Sume * invalid. current code - SEGV on freeaddrinfo(NULL) 41105940Sume * 4256627Sshin * Note: 4356627Sshin * - The code filters out AFs that are not supported by the kernel, 4456627Sshin * when globbing NULL hostname (to loopback, or wildcard). Is it the right 4556627Sshin * thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG 4656627Sshin * in ai_flags? 4761877Sume * - (post-2553) semantics of AI_ADDRCONFIG itself is too vague. 4861877Sume * (1) what should we do against numeric hostname (2) what should we do 4961877Sume * against NULL hostname (3) what is AI_ADDRCONFIG itself. AF not ready? 5061877Sume * non-loopback address configured? global address configured? 51105940Sume * 52105940Sume * OS specific notes for freebsd4: 53105940Sume * - FreeBSD supported $GAI. The code does not. 5455163Sshin */ 5555163Sshin 5692986Sobrien#include <sys/cdefs.h> 5792986Sobrien__FBSDID("$FreeBSD: head/lib/libc/net/getaddrinfo.c 160593 2006-07-23 15:31:03Z ume $"); 5892986Sobrien 5971579Sdeischen#include "namespace.h" 6055163Sshin#include <sys/types.h> 6155163Sshin#include <sys/param.h> 6255163Sshin#include <sys/socket.h> 6355163Sshin#include <net/if.h> 6455163Sshin#include <netinet/in.h> 65121747Sume#include <sys/queue.h> 66121747Sume#ifdef INET6 67121747Sume#include <net/if_var.h> 68121747Sume#include <sys/sysctl.h> 69129901Sume#include <sys/ioctl.h> 70121747Sume#include <netinet6/in6_var.h> /* XXX */ 71121747Sume#endif 7255163Sshin#include <arpa/inet.h> 7355163Sshin#include <arpa/nameser.h> 74121474Sume#include <rpc/rpc.h> 75121474Sume#include <rpcsvc/yp_prot.h> 76121474Sume#include <rpcsvc/ypclnt.h> 7755163Sshin#include <netdb.h> 7855163Sshin#include <resolv.h> 7955163Sshin#include <string.h> 8055163Sshin#include <stdlib.h> 8155163Sshin#include <stddef.h> 8255163Sshin#include <ctype.h> 8355163Sshin#include <unistd.h> 8455163Sshin#include <stdio.h> 8561877Sume#include <errno.h> 86102237Spirzyk 87102237Spirzyk#include "res_config.h" 88102237Spirzyk 8978012Sume#ifdef DEBUG 9078012Sume#include <syslog.h> 9178012Sume#endif 9255163Sshin 9365532Snectar#include <stdarg.h> 9465532Snectar#include <nsswitch.h> 9571579Sdeischen#include "un-namespace.h" 96111618Snectar#include "libc_private.h" 97158115Sume#ifdef NS_CACHING 98158115Sume#include "nscache.h" 99158115Sume#endif 10065532Snectar 10155163Sshin#if defined(__KAME__) && defined(INET6) 10255163Sshin# define FAITH 10355163Sshin#endif 10455163Sshin 105105940Sume#define SUCCESS 0 106105940Sume#define ANY 0 107105940Sume#define YES 1 108105940Sume#define NO 0 10955163Sshin 11055163Sshinstatic const char in_addrany[] = { 0, 0, 0, 0 }; 111105940Sumestatic const char in_loopback[] = { 127, 0, 0, 1 }; 112105940Sume#ifdef INET6 11355163Sshinstatic const char in6_addrany[] = { 11455163Sshin 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 11555163Sshin}; 11655163Sshinstatic const char in6_loopback[] = { 11755163Sshin 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 11855163Sshin}; 119105940Sume#endif 12055163Sshin 121121747Sumestruct policyqueue { 122121747Sume TAILQ_ENTRY(policyqueue) pc_entry; 123121747Sume#ifdef INET6 124121747Sume struct in6_addrpolicy pc_policy; 125121747Sume#endif 126121747Sume}; 127121747SumeTAILQ_HEAD(policyhead, policyqueue); 128121747Sume 12955163Sshinstatic const struct afd { 13055163Sshin int a_af; 13155163Sshin int a_addrlen; 132146244Sume socklen_t a_socklen; 13355163Sshin int a_off; 13455163Sshin const char *a_addrany; 13573665Sobrien const char *a_loopback; 13655163Sshin int a_scoped; 13755163Sshin} afdl [] = { 13855163Sshin#ifdef INET6 13955163Sshin#define N_INET6 0 14055163Sshin {PF_INET6, sizeof(struct in6_addr), 14155163Sshin sizeof(struct sockaddr_in6), 14255163Sshin offsetof(struct sockaddr_in6, sin6_addr), 14355163Sshin in6_addrany, in6_loopback, 1}, 14455163Sshin#define N_INET 1 14555163Sshin#else 14655163Sshin#define N_INET 0 14755163Sshin#endif 14855163Sshin {PF_INET, sizeof(struct in_addr), 14955163Sshin sizeof(struct sockaddr_in), 15055163Sshin offsetof(struct sockaddr_in, sin_addr), 15155163Sshin in_addrany, in_loopback, 0}, 15255163Sshin {0, 0, 0, 0, NULL, NULL, 0}, 15355163Sshin}; 15455163Sshin 15555163Sshinstruct explore { 15661877Sume int e_af; 15755163Sshin int e_socktype; 15855163Sshin int e_protocol; 15955163Sshin const char *e_protostr; 16055163Sshin int e_wild; 161105940Sume#define WILD_AF(ex) ((ex)->e_wild & 0x01) 162105940Sume#define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02) 163105940Sume#define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04) 16455163Sshin}; 16555163Sshin 16655163Sshinstatic const struct explore explore[] = { 16761877Sume#if 0 168121474Sume { PF_LOCAL, 0, ANY, ANY, NULL, 0x01 }, 16961877Sume#endif 17061877Sume#ifdef INET6 171121474Sume { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 }, 172121474Sume { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 }, 173121474Sume { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 }, 17461877Sume#endif 175121474Sume { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 }, 176121474Sume { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 }, 177121474Sume { PF_INET, SOCK_RAW, ANY, NULL, 0x05 }, 178121474Sume { PF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 }, 179121474Sume { PF_UNSPEC, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 }, 180121474Sume { PF_UNSPEC, SOCK_RAW, ANY, NULL, 0x05 }, 18161877Sume { -1, 0, 0, NULL, 0 }, 18255163Sshin}; 18355163Sshin 18455163Sshin#ifdef INET6 185105940Sume#define PTON_MAX 16 18655163Sshin#else 187105940Sume#define PTON_MAX 4 18855163Sshin#endif 18955163Sshin 190121747Sume#define AIO_SRCFLAG_DEPRECATED 0x1 191121747Sume 192121747Sumestruct ai_order { 193121747Sume union { 194121747Sume struct sockaddr_storage aiou_ss; 195121747Sume struct sockaddr aiou_sa; 196121747Sume } aio_src_un; 197121747Sume#define aio_srcsa aio_src_un.aiou_sa 198121747Sume u_int32_t aio_srcflag; 199121747Sume int aio_srcscope; 200121747Sume int aio_dstscope; 201121747Sume struct policyqueue *aio_srcpolicy; 202121747Sume struct policyqueue *aio_dstpolicy; 203121747Sume struct addrinfo *aio_ai; 204121747Sume int aio_matchlen; 205121747Sume}; 206121747Sume 20765532Snectarstatic const ns_src default_dns_files[] = { 20865532Snectar { NSSRC_FILES, NS_SUCCESS }, 20965532Snectar { NSSRC_DNS, NS_SUCCESS }, 21065532Snectar { 0 } 21165532Snectar}; 21265532Snectar 21361877Sumestruct res_target { 21461877Sume struct res_target *next; 21561877Sume const char *name; /* domain name */ 21662614Sitojun int qclass, qtype; /* class and type of query */ 21761877Sume u_char *answer; /* buffer to put answer */ 21861877Sume int anslen; /* size of answer buffer */ 21961877Sume int n; /* result length */ 22061877Sume}; 22161877Sume 222121426Sume#define MAXPACKET (64*1024) 223121426Sume 224121426Sumetypedef union { 225121426Sume HEADER hdr; 226121426Sume u_char buf[MAXPACKET]; 227121426Sume} querybuf; 228121426Sume 229160593Sumestatic int str2number(const char *, int *); 23092941Sobrienstatic int explore_null(const struct addrinfo *, 23192941Sobrien const char *, struct addrinfo **); 23292941Sobrienstatic int explore_numeric(const struct addrinfo *, const char *, 233140906Sume const char *, struct addrinfo **, const char *); 23492941Sobrienstatic int explore_numeric_scope(const struct addrinfo *, const char *, 23592941Sobrien const char *, struct addrinfo **); 23692941Sobrienstatic int get_canonname(const struct addrinfo *, 23792941Sobrien struct addrinfo *, const char *); 23892941Sobrienstatic struct addrinfo *get_ai(const struct addrinfo *, 23992941Sobrien const struct afd *, const char *); 24092905Sobrienstatic int get_portmatch(const struct addrinfo *, const char *); 24192905Sobrienstatic int get_port(struct addrinfo *, const char *, int); 24292905Sobrienstatic const struct afd *find_afd(int); 243121474Sumestatic int addrconfig(struct addrinfo *); 244129901Sumestatic void set_source(struct ai_order *, struct policyhead *); 245121747Sumestatic int comp_dst(const void *, const void *); 24661877Sume#ifdef INET6 247105943Sumestatic int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *); 24861877Sume#endif 249121747Sumestatic int gai_addr2scopetype(struct sockaddr *); 25055163Sshin 251121426Sumestatic int explore_fqdn(const struct addrinfo *, const char *, 252121426Sume const char *, struct addrinfo **); 253121426Sume 254121747Sumestatic int reorder(struct addrinfo *); 255121747Sumestatic int get_addrselectpolicy(struct policyhead *); 256121747Sumestatic void free_addrselectpolicy(struct policyhead *); 257121747Sumestatic struct policyqueue *match_addrselectpolicy(struct sockaddr *, 258121747Sume struct policyhead *); 259129901Sumestatic int matchlen(struct sockaddr *, struct sockaddr *); 260121747Sume 26192941Sobrienstatic struct addrinfo *getanswer(const querybuf *, int, const char *, int, 262156960Sume const struct addrinfo *, res_state); 263121426Sume#if defined(RESOLVSORT) 264156960Sumestatic int addr4sort(struct addrinfo *, res_state); 265121426Sume#endif 266105943Sumestatic int _dns_getaddrinfo(void *, void *, va_list); 267144634Sumestatic void _sethtent(FILE **); 268144634Sumestatic void _endhtent(FILE **); 269144634Sumestatic struct addrinfo *_gethtent(FILE **, const char *, 270144634Sume const struct addrinfo *); 27192905Sobrienstatic int _files_getaddrinfo(void *, void *, va_list); 27261877Sume#ifdef YP 27392905Sobrienstatic struct addrinfo *_yphostent(char *, const struct addrinfo *); 27492905Sobrienstatic int _yp_getaddrinfo(void *, void *, va_list); 27561877Sume#endif 276158115Sume#ifdef NS_CACHING 277158115Sumestatic int addrinfo_id_func(char *, size_t *, va_list, void *); 278158115Sumestatic int addrinfo_marshal_func(char *, size_t *, void *, va_list, void *); 279158115Sumestatic int addrinfo_unmarshal_func(char *, size_t, void *, va_list, void *); 280158115Sume#endif 28161877Sume 282156960Sumestatic int res_queryN(const char *, struct res_target *, res_state); 283156960Sumestatic int res_searchN(const char *, struct res_target *, res_state); 28492941Sobrienstatic int res_querydomainN(const char *, const char *, 285156960Sume struct res_target *, res_state); 28661877Sume 28755163Sshin/* XXX macros that make external reference is BAD. */ 28855163Sshin 289105940Sume#define GET_AI(ai, afd, addr) \ 29055163Sshindo { \ 29155163Sshin /* external reference: pai, error, and label free */ \ 29255163Sshin (ai) = get_ai(pai, (afd), (addr)); \ 29355163Sshin if ((ai) == NULL) { \ 29455163Sshin error = EAI_MEMORY; \ 29555163Sshin goto free; \ 29655163Sshin } \ 29761877Sume} while (/*CONSTCOND*/0) 29855163Sshin 299105940Sume#define GET_PORT(ai, serv) \ 30055163Sshindo { \ 30155163Sshin /* external reference: error and label free */ \ 30255163Sshin error = get_port((ai), (serv), 0); \ 30355163Sshin if (error != 0) \ 30455163Sshin goto free; \ 30561877Sume} while (/*CONSTCOND*/0) 30655163Sshin 307105940Sume#define GET_CANONNAME(ai, str) \ 30855163Sshindo { \ 30955163Sshin /* external reference: pai, error and label free */ \ 31055163Sshin error = get_canonname(pai, (ai), (str)); \ 31155163Sshin if (error != 0) \ 31255163Sshin goto free; \ 31361877Sume} while (/*CONSTCOND*/0) 31455163Sshin 315105940Sume#define ERR(err) \ 31655163Sshindo { \ 31755163Sshin /* external reference: error, and label bad */ \ 31855163Sshin error = (err); \ 31955163Sshin goto bad; \ 32061877Sume /*NOTREACHED*/ \ 32161877Sume} while (/*CONSTCOND*/0) 32255163Sshin 323105940Sume#define MATCH_FAMILY(x, y, w) \ 32461877Sume ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC))) 325105940Sume#define MATCH(x, y, w) \ 32661877Sume ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY))) 32755163Sshin 32855163Sshinvoid 329157119Sumefreeaddrinfo(struct addrinfo *ai) 33055163Sshin{ 33155163Sshin struct addrinfo *next; 33255163Sshin 33355163Sshin do { 33455163Sshin next = ai->ai_next; 33555163Sshin if (ai->ai_canonname) 33655163Sshin free(ai->ai_canonname); 33755163Sshin /* no need to free(ai->ai_addr) */ 33855163Sshin free(ai); 33961877Sume ai = next; 34061877Sume } while (ai); 34155163Sshin} 34255163Sshin 34355163Sshinstatic int 344160593Sumestr2number(const char *p, int *portp) 34555163Sshin{ 34662836Sitojun char *ep; 347140908Sume unsigned long v; 34862836Sitojun 34962836Sitojun if (*p == '\0') 350140908Sume return -1; 35162836Sitojun ep = NULL; 352105943Sume errno = 0; 353140908Sume v = strtoul(p, &ep, 10); 354160593Sume if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) { 355160593Sume *portp = v; 356160593Sume return 0; 357160593Sume } else 358140908Sume return -1; 35955163Sshin} 36055163Sshin 36155163Sshinint 362157119Sumegetaddrinfo(const char *hostname, const char *servname, 363157119Sume const struct addrinfo *hints, struct addrinfo **res) 36455163Sshin{ 36555163Sshin struct addrinfo sentinel; 36655163Sshin struct addrinfo *cur; 36755163Sshin int error = 0; 368121474Sume struct addrinfo ai; 369121474Sume struct addrinfo ai0; 37055163Sshin struct addrinfo *pai; 37155163Sshin const struct explore *ex; 372121747Sume int numeric = 0; 37355163Sshin 37461877Sume memset(&sentinel, 0, sizeof(sentinel)); 37555163Sshin cur = &sentinel; 37655163Sshin pai = &ai; 37755163Sshin pai->ai_flags = 0; 37855163Sshin pai->ai_family = PF_UNSPEC; 37955163Sshin pai->ai_socktype = ANY; 38055163Sshin pai->ai_protocol = ANY; 38155163Sshin pai->ai_addrlen = 0; 38255163Sshin pai->ai_canonname = NULL; 38355163Sshin pai->ai_addr = NULL; 38455163Sshin pai->ai_next = NULL; 38555163Sshin 38655163Sshin if (hostname == NULL && servname == NULL) 38755163Sshin return EAI_NONAME; 38855163Sshin if (hints) { 38955163Sshin /* error check for hints */ 39055163Sshin if (hints->ai_addrlen || hints->ai_canonname || 39155163Sshin hints->ai_addr || hints->ai_next) 39255163Sshin ERR(EAI_BADHINTS); /* xxx */ 39355163Sshin if (hints->ai_flags & ~AI_MASK) 39455163Sshin ERR(EAI_BADFLAGS); 39555163Sshin switch (hints->ai_family) { 39655163Sshin case PF_UNSPEC: 39755163Sshin case PF_INET: 39855163Sshin#ifdef INET6 39955163Sshin case PF_INET6: 40055163Sshin#endif 40155163Sshin break; 40255163Sshin default: 40355163Sshin ERR(EAI_FAMILY); 40455163Sshin } 40555163Sshin memcpy(pai, hints, sizeof(*pai)); 40655163Sshin 40755163Sshin /* 40855163Sshin * if both socktype/protocol are specified, check if they 40955163Sshin * are meaningful combination. 41055163Sshin */ 41155163Sshin if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) { 41261877Sume for (ex = explore; ex->e_af >= 0; ex++) { 413121474Sume if (pai->ai_family != ex->e_af) 41461877Sume continue; 415121474Sume if (ex->e_socktype == ANY) 41655163Sshin continue; 417121474Sume if (ex->e_protocol == ANY) 41855163Sshin continue; 419121474Sume if (pai->ai_socktype == ex->e_socktype && 420121474Sume pai->ai_protocol != ex->e_protocol) { 421121474Sume ERR(EAI_BADHINTS); 422121474Sume } 42355163Sshin } 42455163Sshin } 42555163Sshin } 42655163Sshin 42761877Sume /* 42861877Sume * post-2553: AI_ALL and AI_V4MAPPED are effective only against 429105940Sume * AF_INET6 query. They need to be ignored if specified in other 43061877Sume * occassions. 43161877Sume */ 43261877Sume switch (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) { 43361877Sume case AI_V4MAPPED: 43461877Sume case AI_ALL | AI_V4MAPPED: 43561877Sume if (pai->ai_family != AF_INET6) 43661877Sume pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED); 43761877Sume break; 43861877Sume case AI_ALL: 43961877Sume#if 1 44061877Sume /* illegal */ 44161877Sume ERR(EAI_BADFLAGS); 44261877Sume#else 44361877Sume pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED); 44461877Sume#endif 44561877Sume break; 44661877Sume } 44755163Sshin 44855163Sshin /* 44961877Sume * check for special cases. (1) numeric servname is disallowed if 45061877Sume * socktype/protocol are left unspecified. (2) servname is disallowed 45161877Sume * for raw and other inet{,6} sockets. 45255163Sshin */ 45355163Sshin if (MATCH_FAMILY(pai->ai_family, PF_INET, 1) 45461877Sume#ifdef PF_INET6 455121474Sume || MATCH_FAMILY(pai->ai_family, PF_INET6, 1) 45655163Sshin#endif 45755163Sshin ) { 45861877Sume ai0 = *pai; /* backup *pai */ 45955163Sshin 46061877Sume if (pai->ai_family == PF_UNSPEC) { 46161877Sume#ifdef PF_INET6 46255163Sshin pai->ai_family = PF_INET6; 46355163Sshin#else 46455163Sshin pai->ai_family = PF_INET; 46555163Sshin#endif 46661877Sume } 46755163Sshin error = get_portmatch(pai, servname); 46855163Sshin if (error) 46955163Sshin ERR(error); 47061877Sume 47161877Sume *pai = ai0; 47255163Sshin } 47355163Sshin 47461877Sume ai0 = *pai; 47561877Sume 476121474Sume /* NULL hostname, or numeric hostname */ 477121474Sume for (ex = explore; ex->e_af >= 0; ex++) { 47855163Sshin *pai = ai0; 47955163Sshin 480121474Sume /* PF_UNSPEC entries are prepared for DNS queries only */ 481121474Sume if (ex->e_af == PF_UNSPEC) 48255163Sshin continue; 48361877Sume 484121474Sume if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex))) 485121474Sume continue; 486121474Sume if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex))) 487121474Sume continue; 488121474Sume if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex))) 489121474Sume continue; 490121474Sume 49155163Sshin if (pai->ai_family == PF_UNSPEC) 492121474Sume pai->ai_family = ex->e_af; 493121474Sume if (pai->ai_socktype == ANY && ex->e_socktype != ANY) 494121474Sume pai->ai_socktype = ex->e_socktype; 495121474Sume if (pai->ai_protocol == ANY && ex->e_protocol != ANY) 496121474Sume pai->ai_protocol = ex->e_protocol; 49755163Sshin 498121474Sume if (hostname == NULL) 499121474Sume error = explore_null(pai, servname, &cur->ai_next); 500121474Sume else 501140906Sume error = explore_numeric_scope(pai, hostname, servname, 502140906Sume &cur->ai_next); 50355163Sshin 504121474Sume if (error) 505121474Sume goto free; 506121474Sume 507121474Sume while (cur && cur->ai_next) 508121474Sume cur = cur->ai_next; 50955163Sshin } 51055163Sshin 511121474Sume /* 512121474Sume * XXX 513121474Sume * If numreic representation of AF1 can be interpreted as FQDN 514121474Sume * representation of AF2, we need to think again about the code below. 515121474Sume */ 516121747Sume if (sentinel.ai_next) { 517121747Sume numeric = 1; 518121474Sume goto good; 519121747Sume } 520121474Sume 521121425Sume if (hostname == NULL) 522121425Sume ERR(EAI_NONAME); /* used to be EAI_NODATA */ 52355163Sshin if (pai->ai_flags & AI_NUMERICHOST) 52490053Sroam ERR(EAI_NONAME); 52555163Sshin 526121474Sume if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0)) 527121474Sume ERR(EAI_FAIL); 528121474Sume 52961877Sume /* 53061877Sume * hostname as alphabetical name. 531121474Sume * we would like to prefer AF_INET6 than AF_INET, so we'll make a 532121474Sume * outer loop by AFs. 53361877Sume */ 53461877Sume for (ex = explore; ex->e_af >= 0; ex++) { 53561877Sume *pai = ai0; 53655163Sshin 537121474Sume /* require exact match for family field */ 538121474Sume if (pai->ai_family != ex->e_af) 53961877Sume continue; 54055163Sshin 541121474Sume if (!MATCH(pai->ai_socktype, ex->e_socktype, 542121474Sume WILD_SOCKTYPE(ex))) { 54361877Sume continue; 544121474Sume } 545121474Sume if (!MATCH(pai->ai_protocol, ex->e_protocol, 546121474Sume WILD_PROTOCOL(ex))) { 54761877Sume continue; 548121474Sume } 54955163Sshin 55061877Sume if (pai->ai_socktype == ANY && ex->e_socktype != ANY) 55161877Sume pai->ai_socktype = ex->e_socktype; 55261877Sume if (pai->ai_protocol == ANY && ex->e_protocol != ANY) 55361877Sume pai->ai_protocol = ex->e_protocol; 55461877Sume 555121474Sume error = explore_fqdn(pai, hostname, servname, 556121474Sume &cur->ai_next); 55761877Sume 55861877Sume while (cur && cur->ai_next) 55961877Sume cur = cur->ai_next; 56055163Sshin } 56155163Sshin 562121747Sume /* XXX inhibit errors if we have the result */ 56361877Sume if (sentinel.ai_next) 56461877Sume error = 0; 56561877Sume 566121747Sumegood: 567121747Sume /* 568121747Sume * ensure we return either: 569121747Sume * - error == 0, non-NULL *res 570121747Sume * - error != 0, NULL *res 571121747Sume */ 57261877Sume if (error == 0) { 57361877Sume if (sentinel.ai_next) { 574121747Sume /* 575121747Sume * If the returned entry is for an active connection, 576121747Sume * and the given name is not numeric, reorder the 577121747Sume * list, so that the application would try the list 578121747Sume * in the most efficient order. 579121747Sume */ 580121747Sume if (hints == NULL || !(hints->ai_flags & AI_PASSIVE)) { 581121747Sume if (!numeric) 582121747Sume (void)reorder(&sentinel); 583121747Sume } 58461877Sume *res = sentinel.ai_next; 585121474Sume return SUCCESS; 58661877Sume } else 58761877Sume error = EAI_FAIL; 58855163Sshin } 589121747Sumefree: 590121747Sumebad: 591121474Sume if (sentinel.ai_next) 592121474Sume freeaddrinfo(sentinel.ai_next); 593121474Sume *res = NULL; 59455163Sshin return error; 59555163Sshin} 59655163Sshin 597121747Sumestatic int 598157119Sumereorder(struct addrinfo *sentinel) 599121747Sume{ 600121747Sume struct addrinfo *ai, **aip; 601121747Sume struct ai_order *aio; 602121747Sume int i, n; 603121747Sume struct policyhead policyhead; 604121747Sume 605121747Sume /* count the number of addrinfo elements for sorting. */ 606121747Sume for (n = 0, ai = sentinel->ai_next; ai != NULL; ai = ai->ai_next, n++) 607121747Sume ; 608121747Sume 609121747Sume /* 610121747Sume * If the number is small enough, we can skip the reordering process. 611121747Sume */ 612121747Sume if (n <= 1) 613121747Sume return(n); 614121747Sume 615121747Sume /* allocate a temporary array for sort and initialization of it. */ 616121747Sume if ((aio = malloc(sizeof(*aio) * n)) == NULL) 617121747Sume return(n); /* give up reordering */ 618121747Sume memset(aio, 0, sizeof(*aio) * n); 619121747Sume 620121747Sume /* retrieve address selection policy from the kernel */ 621121747Sume TAILQ_INIT(&policyhead); 622121747Sume if (!get_addrselectpolicy(&policyhead)) { 623121747Sume /* no policy is installed into kernel, we don't sort. */ 624121747Sume free(aio); 625121747Sume return (n); 626121747Sume } 627121747Sume 628121747Sume for (i = 0, ai = sentinel->ai_next; i < n; ai = ai->ai_next, i++) { 629121747Sume aio[i].aio_ai = ai; 630121747Sume aio[i].aio_dstscope = gai_addr2scopetype(ai->ai_addr); 631121747Sume aio[i].aio_dstpolicy = match_addrselectpolicy(ai->ai_addr, 632121747Sume &policyhead); 633129901Sume set_source(&aio[i], &policyhead); 634121747Sume } 635121747Sume 636121747Sume /* perform sorting. */ 637121747Sume qsort(aio, n, sizeof(*aio), comp_dst); 638121747Sume 639121747Sume /* reorder the addrinfo chain. */ 640121747Sume for (i = 0, aip = &sentinel->ai_next; i < n; i++) { 641121747Sume *aip = aio[i].aio_ai; 642121747Sume aip = &aio[i].aio_ai->ai_next; 643121747Sume } 644121747Sume *aip = NULL; 645121747Sume 646121747Sume /* cleanup and return */ 647121747Sume free(aio); 648121747Sume free_addrselectpolicy(&policyhead); 649121747Sume return(n); 650121747Sume} 651121747Sume 652121747Sumestatic int 653157119Sumeget_addrselectpolicy(struct policyhead *head) 654121747Sume{ 655121747Sume#ifdef INET6 656121747Sume int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY }; 657121747Sume size_t l; 658121747Sume char *buf; 659121747Sume struct in6_addrpolicy *pol, *ep; 660121747Sume 661121747Sume if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), NULL, &l, NULL, 0) < 0) 662121747Sume return (0); 663121747Sume if ((buf = malloc(l)) == NULL) 664121747Sume return (0); 665121747Sume if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf, &l, NULL, 0) < 0) { 666121747Sume free(buf); 667121747Sume return (0); 668121747Sume } 669121747Sume 670121747Sume ep = (struct in6_addrpolicy *)(buf + l); 671121747Sume for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) { 672121747Sume struct policyqueue *new; 673121747Sume 674121747Sume if ((new = malloc(sizeof(*new))) == NULL) { 675121747Sume free_addrselectpolicy(head); /* make the list empty */ 676121747Sume break; 677121747Sume } 678121747Sume new->pc_policy = *pol; 679121747Sume TAILQ_INSERT_TAIL(head, new, pc_entry); 680121747Sume } 681121747Sume 682121747Sume free(buf); 683121747Sume return (1); 684121747Sume#else 685121747Sume return (0); 686121747Sume#endif 687121747Sume} 688121747Sume 689121747Sumestatic void 690157119Sumefree_addrselectpolicy(struct policyhead *head) 691121747Sume{ 692121747Sume struct policyqueue *ent, *nent; 693121747Sume 694121747Sume for (ent = TAILQ_FIRST(head); ent; ent = nent) { 695121747Sume nent = TAILQ_NEXT(ent, pc_entry); 696121747Sume TAILQ_REMOVE(head, ent, pc_entry); 697121747Sume free(ent); 698121747Sume } 699121747Sume} 700121747Sume 701121747Sumestatic struct policyqueue * 702157119Sumematch_addrselectpolicy(struct sockaddr *addr, struct policyhead *head) 703121747Sume{ 704121747Sume#ifdef INET6 705121747Sume struct policyqueue *ent, *bestent = NULL; 706121747Sume struct in6_addrpolicy *pol; 707121747Sume int matchlen, bestmatchlen = -1; 708121747Sume u_char *mp, *ep, *k, *p, m; 709121747Sume struct sockaddr_in6 key; 710121747Sume 711121747Sume switch(addr->sa_family) { 712121747Sume case AF_INET6: 713121747Sume key = *(struct sockaddr_in6 *)addr; 714121747Sume break; 715121747Sume case AF_INET: 716121747Sume /* convert the address into IPv4-mapped IPv6 address. */ 717121747Sume memset(&key, 0, sizeof(key)); 718121747Sume key.sin6_family = AF_INET6; 719121747Sume key.sin6_len = sizeof(key); 720121747Sume key.sin6_addr.s6_addr[10] = 0xff; 721121747Sume key.sin6_addr.s6_addr[11] = 0xff; 722121747Sume memcpy(&key.sin6_addr.s6_addr[12], 723121747Sume &((struct sockaddr_in *)addr)->sin_addr, 4); 724121747Sume break; 725121747Sume default: 726121747Sume return(NULL); 727121747Sume } 728121747Sume 729121747Sume for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) { 730121747Sume pol = &ent->pc_policy; 731121747Sume matchlen = 0; 732121747Sume 733121747Sume mp = (u_char *)&pol->addrmask.sin6_addr; 734121747Sume ep = mp + 16; /* XXX: scope field? */ 735121747Sume k = (u_char *)&key.sin6_addr; 736121747Sume p = (u_char *)&pol->addr.sin6_addr; 737121747Sume for (; mp < ep && *mp; mp++, k++, p++) { 738121747Sume m = *mp; 739121747Sume if ((*k & m) != *p) 740121747Sume goto next; /* not match */ 741121747Sume if (m == 0xff) /* short cut for a typical case */ 742121747Sume matchlen += 8; 743121747Sume else { 744121747Sume while (m >= 0x80) { 745121747Sume matchlen++; 746121747Sume m <<= 1; 747121747Sume } 748121747Sume } 749121747Sume } 750121747Sume 751121747Sume /* matched. check if this is better than the current best. */ 752121747Sume if (matchlen > bestmatchlen) { 753121747Sume bestent = ent; 754121747Sume bestmatchlen = matchlen; 755121747Sume } 756121747Sume 757121747Sume next: 758121747Sume continue; 759121747Sume } 760121747Sume 761121747Sume return(bestent); 762121747Sume#else 763121747Sume return(NULL); 764121747Sume#endif 765121747Sume 766121747Sume} 767121747Sume 768129901Sumestatic void 769157119Sumeset_source(struct ai_order *aio, struct policyhead *ph) 770129901Sume{ 771129901Sume struct addrinfo ai = *aio->aio_ai; 772129901Sume struct sockaddr_storage ss; 773145786Sume socklen_t srclen; 774145786Sume int s; 775129901Sume 776129901Sume /* set unspec ("no source is available"), just in case */ 777129901Sume aio->aio_srcsa.sa_family = AF_UNSPEC; 778129901Sume aio->aio_srcscope = -1; 779129901Sume 780129901Sume switch(ai.ai_family) { 781129901Sume case AF_INET: 782129901Sume#ifdef INET6 783129901Sume case AF_INET6: 784129901Sume#endif 785129901Sume break; 786129901Sume default: /* ignore unsupported AFs explicitly */ 787129901Sume return; 788129901Sume } 789129901Sume 790129901Sume /* XXX: make a dummy addrinfo to call connect() */ 791129901Sume ai.ai_socktype = SOCK_DGRAM; 792129901Sume ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */ 793129901Sume ai.ai_next = NULL; 794129901Sume memset(&ss, 0, sizeof(ss)); 795129901Sume memcpy(&ss, ai.ai_addr, ai.ai_addrlen); 796129901Sume ai.ai_addr = (struct sockaddr *)&ss; 797129901Sume get_port(&ai, "1", 0); 798129901Sume 799129901Sume /* open a socket to get the source address for the given dst */ 800129901Sume if ((s = _socket(ai.ai_family, ai.ai_socktype, ai.ai_protocol)) < 0) 801129901Sume return; /* give up */ 802129901Sume if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0) 803129901Sume goto cleanup; 804129901Sume srclen = ai.ai_addrlen; 805129901Sume if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) { 806129901Sume aio->aio_srcsa.sa_family = AF_UNSPEC; 807129901Sume goto cleanup; 808129901Sume } 809129901Sume aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa); 810129901Sume aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph); 811129901Sume aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr); 812129901Sume#ifdef INET6 813129901Sume if (ai.ai_family == AF_INET6) { 814129901Sume struct in6_ifreq ifr6; 815129901Sume u_int32_t flags6; 816129901Sume 817129901Sume /* XXX: interface name should not be hardcoded */ 818129901Sume strncpy(ifr6.ifr_name, "lo0", sizeof(ifr6.ifr_name)); 819129901Sume memset(&ifr6, 0, sizeof(ifr6)); 820129901Sume memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen); 821129901Sume if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) { 822129901Sume flags6 = ifr6.ifr_ifru.ifru_flags6; 823129901Sume if ((flags6 & IN6_IFF_DEPRECATED)) 824129901Sume aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED; 825129901Sume } 826129901Sume } 827129901Sume#endif 828129901Sume 829129901Sume cleanup: 830129901Sume _close(s); 831129901Sume return; 832129901Sume} 833129901Sume 834121747Sumestatic int 835157119Sumematchlen(struct sockaddr *src, struct sockaddr *dst) 836129901Sume{ 837129901Sume int match = 0; 838129901Sume u_char *s, *d; 839129901Sume u_char *lim, r; 840129901Sume int addrlen; 841129901Sume 842129901Sume switch (src->sa_family) { 843129901Sume#ifdef INET6 844129901Sume case AF_INET6: 845129901Sume s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr; 846129901Sume d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr; 847129901Sume addrlen = sizeof(struct in6_addr); 848129901Sume lim = s + addrlen; 849129901Sume break; 850129901Sume#endif 851129901Sume case AF_INET: 852146222Sgnn s = (u_char *)&((struct sockaddr_in *)src)->sin_addr; 853146222Sgnn d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr; 854129901Sume addrlen = sizeof(struct in_addr); 855129901Sume lim = s + addrlen; 856129901Sume break; 857129901Sume default: 858129901Sume return(0); 859129901Sume } 860129901Sume 861129901Sume while (s < lim) 862129901Sume if ((r = (*d++ ^ *s++)) != 0) { 863129901Sume while (r < addrlen * 8) { 864129901Sume match++; 865129901Sume r <<= 1; 866129901Sume } 867129901Sume break; 868129901Sume } else 869129901Sume match += 8; 870129901Sume return(match); 871129901Sume} 872129901Sume 873129901Sumestatic int 874157119Sumecomp_dst(const void *arg1, const void *arg2) 875121747Sume{ 876121747Sume const struct ai_order *dst1 = arg1, *dst2 = arg2; 877121747Sume 878121747Sume /* 879121747Sume * Rule 1: Avoid unusable destinations. 880121747Sume * XXX: we currently do not consider if an appropriate route exists. 881121747Sume */ 882121747Sume if (dst1->aio_srcsa.sa_family != AF_UNSPEC && 883121747Sume dst2->aio_srcsa.sa_family == AF_UNSPEC) { 884121747Sume return(-1); 885121747Sume } 886121747Sume if (dst1->aio_srcsa.sa_family == AF_UNSPEC && 887121747Sume dst2->aio_srcsa.sa_family != AF_UNSPEC) { 888121747Sume return(1); 889121747Sume } 890121747Sume 891121747Sume /* Rule 2: Prefer matching scope. */ 892121747Sume if (dst1->aio_dstscope == dst1->aio_srcscope && 893121747Sume dst2->aio_dstscope != dst2->aio_srcscope) { 894121747Sume return(-1); 895121747Sume } 896121747Sume if (dst1->aio_dstscope != dst1->aio_srcscope && 897121747Sume dst2->aio_dstscope == dst2->aio_srcscope) { 898121747Sume return(1); 899121747Sume } 900121747Sume 901121747Sume /* Rule 3: Avoid deprecated addresses. */ 902121747Sume if (dst1->aio_srcsa.sa_family != AF_UNSPEC && 903121747Sume dst2->aio_srcsa.sa_family != AF_UNSPEC) { 904121747Sume if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) && 905121747Sume (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) { 906121747Sume return(-1); 907121747Sume } 908121747Sume if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) && 909121747Sume !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) { 910121747Sume return(1); 911121747Sume } 912121747Sume } 913121747Sume 914121747Sume /* Rule 4: Prefer home addresses. */ 915121747Sume /* XXX: not implemented yet */ 916121747Sume 917121747Sume /* Rule 5: Prefer matching label. */ 918121747Sume#ifdef INET6 919121747Sume if (dst1->aio_srcpolicy && dst1->aio_dstpolicy && 920121747Sume dst1->aio_srcpolicy->pc_policy.label == 921121747Sume dst1->aio_dstpolicy->pc_policy.label && 922121747Sume (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL || 923121747Sume dst2->aio_srcpolicy->pc_policy.label != 924121747Sume dst2->aio_dstpolicy->pc_policy.label)) { 925121747Sume return(-1); 926121747Sume } 927121747Sume if (dst2->aio_srcpolicy && dst2->aio_dstpolicy && 928121747Sume dst2->aio_srcpolicy->pc_policy.label == 929121747Sume dst2->aio_dstpolicy->pc_policy.label && 930121747Sume (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL || 931121747Sume dst1->aio_srcpolicy->pc_policy.label != 932121747Sume dst1->aio_dstpolicy->pc_policy.label)) { 933121747Sume return(1); 934121747Sume } 935121747Sume#endif 936121747Sume 937121747Sume /* Rule 6: Prefer higher precedence. */ 938121747Sume#ifdef INET6 939121747Sume if (dst1->aio_dstpolicy && 940121747Sume (dst2->aio_dstpolicy == NULL || 941121747Sume dst1->aio_dstpolicy->pc_policy.preced > 942121747Sume dst2->aio_dstpolicy->pc_policy.preced)) { 943121747Sume return(-1); 944121747Sume } 945121747Sume if (dst2->aio_dstpolicy && 946121747Sume (dst1->aio_dstpolicy == NULL || 947121747Sume dst2->aio_dstpolicy->pc_policy.preced > 948121747Sume dst1->aio_dstpolicy->pc_policy.preced)) { 949121747Sume return(1); 950121747Sume } 951121747Sume#endif 952121747Sume 953121747Sume /* Rule 7: Prefer native transport. */ 954121747Sume /* XXX: not implemented yet */ 955121747Sume 956121747Sume /* Rule 8: Prefer smaller scope. */ 957121747Sume if (dst1->aio_dstscope >= 0 && 958121747Sume dst1->aio_dstscope < dst2->aio_dstscope) { 959121747Sume return(-1); 960121747Sume } 961121747Sume if (dst2->aio_dstscope >= 0 && 962121747Sume dst2->aio_dstscope < dst1->aio_dstscope) { 963121747Sume return(1); 964121747Sume } 965121747Sume 966121747Sume /* 967121747Sume * Rule 9: Use longest matching prefix. 968121747Sume * We compare the match length in a same AF only. 969121747Sume */ 970121747Sume if (dst1->aio_ai->ai_addr->sa_family == 971121747Sume dst2->aio_ai->ai_addr->sa_family) { 972121747Sume if (dst1->aio_matchlen > dst2->aio_matchlen) { 973121747Sume return(-1); 974121747Sume } 975121747Sume if (dst1->aio_matchlen < dst2->aio_matchlen) { 976121747Sume return(1); 977121747Sume } 978121747Sume } 979121747Sume 980121747Sume /* Rule 10: Otherwise, leave the order unchanged. */ 981121747Sume return(-1); 982121747Sume} 983121747Sume 98455163Sshin/* 985121747Sume * Copy from scope.c. 986121747Sume * XXX: we should standardize the functions and link them as standard 987121747Sume * library. 988121747Sume */ 989121747Sumestatic int 990157119Sumegai_addr2scopetype(struct sockaddr *sa) 991121747Sume{ 992121747Sume#ifdef INET6 993121747Sume struct sockaddr_in6 *sa6; 994121747Sume#endif 995121747Sume struct sockaddr_in *sa4; 996121747Sume 997121747Sume switch(sa->sa_family) { 998121747Sume#ifdef INET6 999121747Sume case AF_INET6: 1000121747Sume sa6 = (struct sockaddr_in6 *)sa; 1001121747Sume if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 1002121747Sume /* just use the scope field of the multicast address */ 1003121747Sume return(sa6->sin6_addr.s6_addr[2] & 0x0f); 1004121747Sume } 1005121747Sume /* 1006121747Sume * Unicast addresses: map scope type to corresponding scope 1007121747Sume * value defined for multcast addresses. 1008121747Sume * XXX: hardcoded scope type values are bad... 1009121747Sume */ 1010121747Sume if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr)) 1011121747Sume return(1); /* node local scope */ 1012121747Sume if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) 1013121747Sume return(2); /* link-local scope */ 1014121747Sume if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr)) 1015121747Sume return(5); /* site-local scope */ 1016121747Sume return(14); /* global scope */ 1017121747Sume break; 1018121747Sume#endif 1019121747Sume case AF_INET: 1020121747Sume /* 1021121747Sume * IPv4 pseudo scoping according to RFC 3484. 1022121747Sume */ 1023121747Sume sa4 = (struct sockaddr_in *)sa; 1024121747Sume /* IPv4 autoconfiguration addresses have link-local scope. */ 1025121747Sume if (((u_char *)&sa4->sin_addr)[0] == 169 && 1026121747Sume ((u_char *)&sa4->sin_addr)[1] == 254) 1027121747Sume return(2); 1028121747Sume /* Private addresses have site-local scope. */ 1029121747Sume if (((u_char *)&sa4->sin_addr)[0] == 10 || 1030121747Sume (((u_char *)&sa4->sin_addr)[0] == 172 && 1031121747Sume (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) || 1032121747Sume (((u_char *)&sa4->sin_addr)[0] == 192 && 1033121747Sume ((u_char *)&sa4->sin_addr)[1] == 168)) 1034129905Sume return(14); /* XXX: It should be 5 unless NAT */ 1035121747Sume /* Loopback addresses have link-local scope. */ 1036121747Sume if (((u_char *)&sa4->sin_addr)[0] == 127) 1037121747Sume return(2); 1038121747Sume return(14); 1039121747Sume break; 1040121747Sume default: 1041121747Sume errno = EAFNOSUPPORT; /* is this a good error? */ 1042121747Sume return(-1); 1043121747Sume } 1044121747Sume} 1045121747Sume 1046121747Sume/* 104755163Sshin * hostname == NULL. 104855163Sshin * passive socket -> anyaddr (0.0.0.0 or ::) 104955163Sshin * non-passive socket -> localhost (127.0.0.1 or ::1) 105055163Sshin */ 105155163Sshinstatic int 1052157119Sumeexplore_null(const struct addrinfo *pai, const char *servname, 1053157119Sume struct addrinfo **res) 105455163Sshin{ 1055121474Sume int s; 105655163Sshin const struct afd *afd; 1057160551Sume struct addrinfo *ai; 105855163Sshin int error; 105955163Sshin 106055163Sshin *res = NULL; 1061160551Sume ai = NULL; 106255163Sshin 106355163Sshin /* 1064121474Sume * filter out AFs that are not supported by the kernel 1065121474Sume * XXX errno? 1066121474Sume */ 1067121474Sume s = _socket(pai->ai_family, SOCK_DGRAM, 0); 1068121474Sume if (s < 0) { 1069121474Sume if (errno != EMFILE) 1070121474Sume return 0; 1071121474Sume } else 1072121474Sume _close(s); 1073121474Sume 1074121474Sume /* 107561877Sume * if the servname does not match socktype/protocol, ignore it. 107661877Sume */ 107761877Sume if (get_portmatch(pai, servname) != 0) 107855163Sshin return 0; 107961877Sume 108055163Sshin afd = find_afd(pai->ai_family); 108155163Sshin if (afd == NULL) 108255163Sshin return 0; 108355163Sshin 108461877Sume if (pai->ai_flags & AI_PASSIVE) { 1085160551Sume GET_AI(ai, afd, afd->a_addrany); 1086160551Sume GET_PORT(ai, servname); 108761877Sume } else { 1088160551Sume GET_AI(ai, afd, afd->a_loopback); 1089160551Sume GET_PORT(ai, servname); 109061877Sume } 109155163Sshin 1092160551Sume *res = ai; 109355163Sshin return 0; 109455163Sshin 109555163Sshinfree: 1096160551Sume if (ai != NULL) 1097160551Sume freeaddrinfo(ai); 109855163Sshin return error; 109955163Sshin} 110055163Sshin 110155163Sshin/* 110255163Sshin * numeric hostname 110355163Sshin */ 110455163Sshinstatic int 1105157119Sumeexplore_numeric(const struct addrinfo *pai, const char *hostname, 1106157119Sume const char *servname, struct addrinfo **res, const char *canonname) 110755163Sshin{ 110855163Sshin const struct afd *afd; 1109160551Sume struct addrinfo *ai; 111055163Sshin int error; 111155163Sshin char pton[PTON_MAX]; 111255163Sshin 111355163Sshin *res = NULL; 1114160551Sume ai = NULL; 111555163Sshin 1116121474Sume /* 1117121474Sume * if the servname does not match socktype/protocol, ignore it. 1118121474Sume */ 1119121474Sume if (get_portmatch(pai, servname) != 0) 1120121474Sume return 0; 1121121474Sume 112255163Sshin afd = find_afd(pai->ai_family); 112355163Sshin if (afd == NULL) 112455163Sshin return 0; 112555163Sshin 112662614Sitojun switch (afd->a_af) { 112762614Sitojun case AF_INET: 1128160552Sume /* 1129160552Sume * RFC3493 requires getaddrinfo() to accept AF_INET formats 1130160552Sume * that are accepted by inet_addr() and its family. The 1131160552Sume * accepted forms includes the "classful" one, which inet_pton 1132160552Sume * does not accept. So we need to separate the case for 1133160552Sume * AF_INET. 1134160552Sume */ 1135160553Sume if (inet_aton(hostname, (struct in_addr *)pton) != 1) 1136160553Sume return 0; 113762614Sitojun break; 113862614Sitojun default: 1139160553Sume if (inet_pton(afd->a_af, hostname, pton) != 1) 1140160553Sume return 0; 114162614Sitojun break; 114255163Sshin } 114355163Sshin 1144160553Sume if (pai->ai_family == afd->a_af) { 1145160553Sume GET_AI(ai, afd, pton); 1146160553Sume GET_PORT(ai, servname); 1147160553Sume if ((pai->ai_flags & AI_CANONNAME)) { 1148160553Sume /* 1149160553Sume * Set the numeric address itself as the canonical 1150160553Sume * name, based on a clarification in RFC3493. 1151160553Sume */ 1152160553Sume GET_CANONNAME(ai, canonname); 1153160553Sume } 1154160553Sume } else { 1155160553Sume /* 1156160553Sume * XXX: This should not happen since we already matched the AF 1157160553Sume * by find_afd. 1158160553Sume */ 1159160553Sume ERR(EAI_FAMILY); 1160160553Sume } 1161160553Sume 1162160551Sume *res = ai; 116355163Sshin return 0; 116455163Sshin 116555163Sshinfree: 116655163Sshinbad: 1167160551Sume if (ai != NULL) 1168160551Sume freeaddrinfo(ai); 116955163Sshin return error; 117055163Sshin} 117155163Sshin 117255163Sshin/* 117355163Sshin * numeric hostname with scope 117455163Sshin */ 117555163Sshinstatic int 1176157119Sumeexplore_numeric_scope(const struct addrinfo *pai, const char *hostname, 1177157119Sume const char *servname, struct addrinfo **res) 117855163Sshin{ 117961877Sume#if !defined(SCOPE_DELIMITER) || !defined(INET6) 1180140906Sume return explore_numeric(pai, hostname, servname, res, hostname); 118155163Sshin#else 118255163Sshin const struct afd *afd; 118355163Sshin struct addrinfo *cur; 118455163Sshin int error; 118561877Sume char *cp, *hostname2 = NULL, *scope, *addr; 118655163Sshin struct sockaddr_in6 *sin6; 118755163Sshin 1188121474Sume /* 1189121474Sume * if the servname does not match socktype/protocol, ignore it. 1190121474Sume */ 1191121474Sume if (get_portmatch(pai, servname) != 0) 1192121474Sume return 0; 1193121474Sume 119455163Sshin afd = find_afd(pai->ai_family); 119555163Sshin if (afd == NULL) 119655163Sshin return 0; 119765532Snectar 119855163Sshin if (!afd->a_scoped) 1199140906Sume return explore_numeric(pai, hostname, servname, res, hostname); 120055163Sshin 120155163Sshin cp = strchr(hostname, SCOPE_DELIMITER); 120255163Sshin if (cp == NULL) 1203140906Sume return explore_numeric(pai, hostname, servname, res, hostname); 120455163Sshin 120555163Sshin /* 120655163Sshin * Handle special case of <scoped_address><delimiter><scope id> 120755163Sshin */ 120855163Sshin hostname2 = strdup(hostname); 120955163Sshin if (hostname2 == NULL) 121055163Sshin return EAI_MEMORY; 121155163Sshin /* terminate at the delimiter */ 121255163Sshin hostname2[cp - hostname] = '\0'; 121361877Sume addr = hostname2; 121461877Sume scope = cp + 1; 121555163Sshin 1216140906Sume error = explore_numeric(pai, addr, servname, res, hostname); 121761877Sume if (error == 0) { 1218105943Sume u_int32_t scopeid; 121955163Sshin 122055163Sshin for (cur = *res; cur; cur = cur->ai_next) { 122155163Sshin if (cur->ai_family != AF_INET6) 122255163Sshin continue; 122361877Sume sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr; 1224105943Sume if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) { 122561877Sume free(hostname2); 1226121425Sume return(EAI_NONAME); /* XXX: is return OK? */ 122761877Sume } 122861877Sume sin6->sin6_scope_id = scopeid; 122955163Sshin } 123055163Sshin } 123155163Sshin 123255163Sshin free(hostname2); 123355163Sshin 123455163Sshin return error; 123555163Sshin#endif 123655163Sshin} 123755163Sshin 123855163Sshinstatic int 1239157119Sumeget_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str) 124055163Sshin{ 124155163Sshin if ((pai->ai_flags & AI_CANONNAME) != 0) { 1242140947Sume ai->ai_canonname = strdup(str); 124355163Sshin if (ai->ai_canonname == NULL) 124455163Sshin return EAI_MEMORY; 124555163Sshin } 124655163Sshin return 0; 124755163Sshin} 124855163Sshin 124955163Sshinstatic struct addrinfo * 1250157119Sumeget_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr) 125155163Sshin{ 125255163Sshin char *p; 125355163Sshin struct addrinfo *ai; 125455163Sshin#ifdef FAITH 125555163Sshin struct in6_addr faith_prefix; 125655163Sshin char *fp_str; 125755163Sshin int translate = 0; 125855163Sshin#endif 125955163Sshin 126055163Sshin#ifdef FAITH 126155163Sshin /* 126255163Sshin * Transfrom an IPv4 addr into a special IPv6 addr format for 126355163Sshin * IPv6->IPv4 translation gateway. (only TCP is supported now) 126455163Sshin * 126555163Sshin * +-----------------------------------+------------+ 126655163Sshin * | faith prefix part (12 bytes) | embedded | 126755163Sshin * | | IPv4 addr part (4 bytes) 126855163Sshin * +-----------------------------------+------------+ 126955163Sshin * 127055163Sshin * faith prefix part is specified as ascii IPv6 addr format 127155163Sshin * in environmental variable GAI. 127255163Sshin * For FAITH to work correctly, routing to faith prefix must be 127355163Sshin * setup toward a machine where a FAITH daemon operates. 127455163Sshin * Also, the machine must enable some mechanizm 127555163Sshin * (e.g. faith interface hack) to divert those packet with 127655163Sshin * faith prefixed destination addr to user-land FAITH daemon. 127755163Sshin */ 127855163Sshin fp_str = getenv("GAI"); 127955163Sshin if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 && 128055163Sshin afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) { 128155163Sshin u_int32_t v4a; 128255163Sshin u_int8_t v4a_top; 128355163Sshin 128455163Sshin memcpy(&v4a, addr, sizeof v4a); 128555163Sshin v4a_top = v4a >> IN_CLASSA_NSHIFT; 128655163Sshin if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) && 128755163Sshin v4a_top != 0 && v4a != IN_LOOPBACKNET) { 128855163Sshin afd = &afdl[N_INET6]; 128955163Sshin memcpy(&faith_prefix.s6_addr[12], addr, 129055163Sshin sizeof(struct in_addr)); 129155163Sshin translate = 1; 129255163Sshin } 129355163Sshin } 129455163Sshin#endif 129555163Sshin 129655163Sshin ai = (struct addrinfo *)malloc(sizeof(struct addrinfo) 129755163Sshin + (afd->a_socklen)); 129855163Sshin if (ai == NULL) 129955163Sshin return NULL; 130055163Sshin 130155163Sshin memcpy(ai, pai, sizeof(struct addrinfo)); 130261877Sume ai->ai_addr = (struct sockaddr *)(void *)(ai + 1); 130361877Sume memset(ai->ai_addr, 0, (size_t)afd->a_socklen); 130455163Sshin ai->ai_addr->sa_len = afd->a_socklen; 130555163Sshin ai->ai_addrlen = afd->a_socklen; 130655163Sshin ai->ai_addr->sa_family = ai->ai_family = afd->a_af; 130765532Snectar p = (char *)(void *)(ai->ai_addr); 130855163Sshin#ifdef FAITH 130955163Sshin if (translate == 1) 131065532Snectar memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen); 131155163Sshin else 131255163Sshin#endif 131365532Snectar memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen); 131455163Sshin return ai; 131555163Sshin} 131655163Sshin 131755163Sshinstatic int 1318157119Sumeget_portmatch(const struct addrinfo *ai, const char *servname) 131955163Sshin{ 132061877Sume 1321140908Sume /* get_port does not touch first argument when matchonly == 1. */ 132261877Sume /* LINTED const cast */ 132355163Sshin return get_port((struct addrinfo *)ai, servname, 1); 132455163Sshin} 132555163Sshin 132655163Sshinstatic int 1327157119Sumeget_port(struct addrinfo *ai, const char *servname, int matchonly) 132855163Sshin{ 132955163Sshin const char *proto; 133055163Sshin struct servent *sp; 1331160593Sume int port, error; 133255163Sshin int allownumeric; 133355163Sshin 133455163Sshin if (servname == NULL) 133555163Sshin return 0; 133661877Sume switch (ai->ai_family) { 133761877Sume case AF_INET: 133861877Sume#ifdef AF_INET6 133961877Sume case AF_INET6: 134055163Sshin#endif 134161877Sume break; 134261877Sume default: 134355163Sshin return 0; 134461877Sume } 134555163Sshin 134655163Sshin switch (ai->ai_socktype) { 134755163Sshin case SOCK_RAW: 134855163Sshin return EAI_SERVICE; 134955163Sshin case SOCK_DGRAM: 135055163Sshin case SOCK_STREAM: 135155163Sshin allownumeric = 1; 135255163Sshin break; 135355163Sshin case ANY: 135455163Sshin allownumeric = 0; 135555163Sshin break; 135655163Sshin default: 135755163Sshin return EAI_SOCKTYPE; 135855163Sshin } 135955163Sshin 1360160593Sume error = str2number(servname, &port); 1361160593Sume if (error == 0) { 136255163Sshin if (!allownumeric) 136355163Sshin return EAI_SERVICE; 136455163Sshin if (port < 0 || port > 65535) 136555163Sshin return EAI_SERVICE; 1366105940Sume port = htons(port); 136755163Sshin } else { 1368140908Sume if (ai->ai_flags & AI_NUMERICSERV) 1369140908Sume return EAI_NONAME; 1370121474Sume switch (ai->ai_socktype) { 1371121474Sume case SOCK_DGRAM: 137255163Sshin proto = "udp"; 137355163Sshin break; 1374121474Sume case SOCK_STREAM: 137555163Sshin proto = "tcp"; 137655163Sshin break; 137755163Sshin default: 137855163Sshin proto = NULL; 137955163Sshin break; 138055163Sshin } 138155163Sshin 1382145118Sume if ((sp = getservbyname(servname, proto)) == NULL) 138355163Sshin return EAI_SERVICE; 138455163Sshin port = sp->s_port; 138555163Sshin } 138655163Sshin 138755163Sshin if (!matchonly) { 138855163Sshin switch (ai->ai_family) { 138955163Sshin case AF_INET: 139061877Sume ((struct sockaddr_in *)(void *) 139161877Sume ai->ai_addr)->sin_port = port; 139255163Sshin break; 139355163Sshin#ifdef INET6 139455163Sshin case AF_INET6: 139561877Sume ((struct sockaddr_in6 *)(void *) 139661877Sume ai->ai_addr)->sin6_port = port; 139755163Sshin break; 139855163Sshin#endif 139955163Sshin } 140055163Sshin } 140155163Sshin 140255163Sshin return 0; 140355163Sshin} 140455163Sshin 140555163Sshinstatic const struct afd * 1406157119Sumefind_afd(int af) 140755163Sshin{ 140855163Sshin const struct afd *afd; 140955163Sshin 141055163Sshin if (af == PF_UNSPEC) 141155163Sshin return NULL; 141255163Sshin for (afd = afdl; afd->a_af; afd++) { 141355163Sshin if (afd->a_af == af) 141455163Sshin return afd; 141555163Sshin } 141655163Sshin return NULL; 141755163Sshin} 141861877Sume 141961877Sume/* 142061877Sume * post-2553: AI_ADDRCONFIG check. if we use getipnodeby* as backend, backend 142161877Sume * will take care of it. 142261877Sume * the semantics of AI_ADDRCONFIG is not defined well. we are not sure 142361877Sume * if the code is right or not. 1424121474Sume * 1425121474Sume * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with 1426121474Sume * _dns_getaddrinfo. 142761877Sume */ 142861877Sumestatic int 1429157119Sumeaddrconfig(struct addrinfo *pai) 143061877Sume{ 1431121474Sume int s, af; 143261877Sume 1433121474Sume /* 1434121474Sume * TODO: 1435121474Sume * Note that implementation dependent test for address 1436121474Sume * configuration should be done everytime called 1437121474Sume * (or apropriate interval), 1438121474Sume * because addresses will be dynamically assigned or deleted. 1439121474Sume */ 1440121474Sume af = pai->ai_family; 1441121474Sume if (af == AF_UNSPEC) { 1442121474Sume if ((s = _socket(AF_INET6, SOCK_DGRAM, 0)) < 0) 1443121474Sume af = AF_INET; 1444121474Sume else { 1445121474Sume _close(s); 1446121474Sume if ((s = _socket(AF_INET, SOCK_DGRAM, 0)) < 0) 1447121474Sume af = AF_INET6; 1448121474Sume else 1449121474Sume _close(s); 1450121474Sume } 1451121474Sume } 1452121474Sume if (af != AF_UNSPEC) { 1453121474Sume if ((s = _socket(af, SOCK_DGRAM, 0)) < 0) 145461877Sume return 0; 1455121474Sume _close(s); 1456121474Sume } 1457121474Sume pai->ai_family = af; 145861877Sume return 1; 145961877Sume} 146061877Sume 146161877Sume#ifdef INET6 146261877Sume/* convert a string to a scope identifier. XXX: IPv6 specific */ 146361877Sumestatic int 1464157119Sumeip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid) 146561877Sume{ 1466105943Sume u_long lscopeid; 1467121474Sume struct in6_addr *a6; 146861877Sume char *ep; 146961877Sume 1470121474Sume a6 = &sin6->sin6_addr; 1471121474Sume 147262836Sitojun /* empty scopeid portion is invalid */ 147362836Sitojun if (*scope == '\0') 147462836Sitojun return -1; 147562836Sitojun 1476121474Sume if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) { 147761877Sume /* 147861877Sume * We currently assume a one-to-one mapping between links 147961877Sume * and interfaces, so we simply use interface indices for 148061877Sume * like-local scopes. 148161877Sume */ 1482105943Sume *scopeid = if_nametoindex(scope); 1483105943Sume if (*scopeid == 0) 148461877Sume goto trynumeric; 1485105943Sume return 0; 148661877Sume } 148761877Sume 148861877Sume /* still unclear about literal, allow numeric only - placeholder */ 148961877Sume if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6)) 149061877Sume goto trynumeric; 149161877Sume if (IN6_IS_ADDR_MC_ORGLOCAL(a6)) 149261877Sume goto trynumeric; 149361877Sume else 149461877Sume goto trynumeric; /* global */ 149561877Sume 149661877Sume /* try to convert to a numeric id as a last resort */ 1497121474Sume trynumeric: 1498105943Sume errno = 0; 1499105943Sume lscopeid = strtoul(scope, &ep, 10); 1500105943Sume *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL); 1501105943Sume if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid) 1502105943Sume return 0; 150361877Sume else 150461877Sume return -1; 150561877Sume} 150661877Sume#endif 150761877Sume 1508158115Sume 1509158115Sume#ifdef NS_CACHING 1510158115Sumestatic int 1511158115Sumeaddrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap, 1512158115Sume void *cache_mdata) 1513158115Sume{ 1514158115Sume res_state statp; 1515158115Sume u_long res_options; 1516158115Sume 1517158115Sume const int op_id = 0; /* identifies the getaddrinfo for the cache */ 1518158115Sume char *hostname; 1519158115Sume struct addrinfo *hints; 1520158115Sume 1521158115Sume char *p; 1522158115Sume int ai_flags, ai_family, ai_socktype, ai_protocol; 1523158115Sume size_t desired_size, size; 1524158115Sume 1525158115Sume statp = __res_state(); 1526158115Sume res_options = statp->options & (RES_RECURSE | RES_DEFNAMES | 1527158115Sume RES_DNSRCH | RES_NOALIASES | RES_USE_INET6); 1528158115Sume 1529158115Sume hostname = va_arg(ap, char *); 1530158115Sume hints = va_arg(ap, struct addrinfo *); 1531158115Sume 1532158115Sume desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4; 1533158115Sume if (hostname != NULL) { 1534158115Sume size = strlen(hostname); 1535158115Sume desired_size += size + 1; 1536158115Sume } else 1537158115Sume size = 0; 1538158115Sume 1539158115Sume if (desired_size > *buffer_size) { 1540158115Sume *buffer_size = desired_size; 1541158115Sume return (NS_RETURN); 1542158115Sume } 1543158115Sume 1544158115Sume if (hints == NULL) 1545158115Sume ai_flags = ai_family = ai_socktype = ai_protocol = 0; 1546158115Sume else { 1547158115Sume ai_flags = hints->ai_flags; 1548158115Sume ai_family = hints->ai_family; 1549158115Sume ai_socktype = hints->ai_socktype; 1550158115Sume ai_protocol = hints->ai_protocol; 1551158115Sume } 1552158115Sume 1553158115Sume p = buffer; 1554158115Sume memcpy(p, &res_options, sizeof(res_options)); 1555158115Sume p += sizeof(res_options); 1556158115Sume 1557158115Sume memcpy(p, &op_id, sizeof(int)); 1558158115Sume p += sizeof(int); 1559158115Sume 1560158115Sume memcpy(p, &ai_flags, sizeof(int)); 1561158115Sume p += sizeof(int); 1562158115Sume 1563158115Sume memcpy(p, &ai_family, sizeof(int)); 1564158115Sume p += sizeof(int); 1565158115Sume 1566158115Sume memcpy(p, &ai_socktype, sizeof(int)); 1567158115Sume p += sizeof(int); 1568158115Sume 1569158115Sume memcpy(p, &ai_protocol, sizeof(int)); 1570158115Sume p += sizeof(int); 1571158115Sume 1572158115Sume if (hostname != NULL) 1573158115Sume memcpy(p, hostname, size); 1574158115Sume 1575158115Sume *buffer_size = desired_size; 1576158115Sume return (NS_SUCCESS); 1577158115Sume} 1578158115Sume 1579158115Sumestatic int 1580158115Sumeaddrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval, 1581158115Sume va_list ap, void *cache_mdata) 1582158115Sume{ 1583158115Sume struct addrinfo *ai, *cai; 1584158115Sume char *p; 1585158115Sume size_t desired_size, size, ai_size; 1586158115Sume 1587158115Sume ai = *((struct addrinfo **)retval); 1588158115Sume 1589158115Sume desired_size = sizeof(size_t); 1590158115Sume ai_size = 0; 1591158115Sume for (cai = ai; cai != NULL; cai = cai->ai_next) { 1592158115Sume desired_size += sizeof(struct addrinfo) + cai->ai_addrlen; 1593158115Sume if (cai->ai_canonname != NULL) 1594158115Sume desired_size += sizeof(size_t) + 1595158115Sume strlen(cai->ai_canonname); 1596158115Sume ++ai_size; 1597158115Sume } 1598158115Sume 1599158115Sume if (desired_size > *buffer_size) { 1600158115Sume /* this assignment is here for future use */ 1601158115Sume errno = ERANGE; 1602158115Sume *buffer_size = desired_size; 1603158115Sume return (NS_RETURN); 1604158115Sume } 1605158115Sume 1606158115Sume memset(buffer, 0, desired_size); 1607158115Sume p = buffer; 1608158115Sume 1609158115Sume memcpy(p, &ai_size, sizeof(size_t)); 1610158115Sume p += sizeof(size_t); 1611158115Sume for (cai = ai; cai != NULL; cai = cai->ai_next) { 1612158115Sume memcpy(p, cai, sizeof(struct addrinfo)); 1613158115Sume p += sizeof(struct addrinfo); 1614158115Sume 1615158115Sume memcpy(p, cai->ai_addr, cai->ai_addrlen); 1616158115Sume p += cai->ai_addrlen; 1617158115Sume 1618158115Sume if (cai->ai_canonname != NULL) { 1619158115Sume size = strlen(cai->ai_canonname); 1620158115Sume memcpy(p, &size, sizeof(size_t)); 1621158115Sume p += sizeof(size_t); 1622158115Sume 1623158115Sume memcpy(p, cai->ai_canonname, size); 1624158115Sume p += size; 1625158115Sume } 1626158115Sume } 1627158115Sume 1628158115Sume return (NS_SUCCESS); 1629158115Sume} 1630158115Sume 1631158115Sumestatic int 1632158115Sumeaddrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval, 1633158115Sume va_list ap, void *cache_mdata) 1634158115Sume{ 1635158115Sume struct addrinfo new_ai, *result, *sentinel, *lasts; 1636158115Sume 1637158115Sume char *p; 1638158115Sume size_t ai_size, ai_i, size; 1639158115Sume 1640158115Sume p = buffer; 1641158115Sume memcpy(&ai_size, p, sizeof(size_t)); 1642158115Sume p += sizeof(size_t); 1643158115Sume 1644158115Sume result = NULL; 1645158115Sume lasts = NULL; 1646158115Sume for (ai_i = 0; ai_i < ai_size; ++ai_i) { 1647158115Sume memcpy(&new_ai, p, sizeof(struct addrinfo)); 1648158115Sume p += sizeof(struct addrinfo); 1649158115Sume size = new_ai.ai_addrlen + sizeof(struct addrinfo) + 1650158115Sume _ALIGNBYTES; 1651158115Sume 1652158115Sume sentinel = (struct addrinfo *)malloc(size); 1653158115Sume memset(sentinel, 0, size); 1654158115Sume 1655158115Sume memcpy(sentinel, &new_ai, sizeof(struct addrinfo)); 1656158115Sume sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel + 1657158115Sume sizeof(struct addrinfo)); 1658158115Sume 1659158115Sume memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen); 1660158115Sume p += new_ai.ai_addrlen; 1661158115Sume 1662158115Sume if (new_ai.ai_canonname != NULL) { 1663158115Sume memcpy(&size, p, sizeof(size_t)); 1664158115Sume p += sizeof(size_t); 1665158115Sume 1666158115Sume sentinel->ai_canonname = (char *)malloc(size + 1); 1667158115Sume memset(sentinel->ai_canonname, 0, size + 1); 1668158115Sume 1669158115Sume memcpy(sentinel->ai_canonname, p, size); 1670158115Sume p += size; 1671158115Sume } 1672158115Sume 1673158115Sume if (result == NULL) { 1674158115Sume result = sentinel; 1675158115Sume lasts = sentinel; 1676158115Sume } else { 1677158115Sume lasts->ai_next = sentinel; 1678158115Sume lasts = sentinel; 1679158115Sume } 1680158115Sume } 1681158115Sume 1682158115Sume *((struct addrinfo **)retval) = result; 1683158115Sume return (NS_SUCCESS); 1684158115Sume} 1685158115Sume#endif /* NS_CACHING */ 1686158115Sume 1687121426Sume/* 1688121426Sume * FQDN hostname, DNS lookup 1689121426Sume */ 1690102237Spirzykstatic int 1691157119Sumeexplore_fqdn(const struct addrinfo *pai, const char *hostname, 1692157119Sume const char *servname, struct addrinfo **res) 1693102237Spirzyk{ 1694121426Sume struct addrinfo *result; 1695121426Sume struct addrinfo *cur; 1696121426Sume int error = 0; 1697158115Sume 1698158115Sume#ifdef NS_CACHING 1699158115Sume static const nss_cache_info cache_info = 1700158115Sume NS_COMMON_CACHE_INFO_INITIALIZER( 1701158115Sume hosts, NULL, addrinfo_id_func, addrinfo_marshal_func, 1702158115Sume addrinfo_unmarshal_func); 1703158115Sume#endif 1704121426Sume static const ns_dtab dtab[] = { 1705121426Sume NS_FILES_CB(_files_getaddrinfo, NULL) 1706121426Sume { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */ 1707121426Sume NS_NIS_CB(_yp_getaddrinfo, NULL) 1708158115Sume#ifdef NS_CACHING 1709158115Sume NS_CACHE_CB(&cache_info) 1710158115Sume#endif 1711121426Sume { 0 } 1712121426Sume }; 1713102237Spirzyk 1714121426Sume result = NULL; 1715121426Sume 1716121426Sume /* 1717121426Sume * if the servname does not match socktype/protocol, ignore it. 1718121426Sume */ 1719126243Sgreen if (get_portmatch(pai, servname) != 0) 1720102237Spirzyk return 0; 1721102237Spirzyk 1722121426Sume switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo", 1723121426Sume default_dns_files, hostname, pai)) { 1724121426Sume case NS_TRYAGAIN: 1725121426Sume error = EAI_AGAIN; 1726121426Sume goto free; 1727121426Sume case NS_UNAVAIL: 1728121426Sume error = EAI_FAIL; 1729121426Sume goto free; 1730121426Sume case NS_NOTFOUND: 1731121426Sume error = EAI_NONAME; 1732121426Sume goto free; 1733121426Sume case NS_SUCCESS: 1734121426Sume error = 0; 1735121426Sume for (cur = result; cur; cur = cur->ai_next) { 1736121426Sume GET_PORT(cur, servname); 1737121426Sume /* canonname should be filled already */ 1738121426Sume } 1739121426Sume break; 1740102237Spirzyk } 1741102237Spirzyk 1742121426Sume *res = result; 1743121426Sume 1744102237Spirzyk return 0; 1745121426Sume 1746121426Sumefree: 1747121426Sume if (result) 1748121426Sume freeaddrinfo(result); 1749121426Sume return error; 1750102237Spirzyk} 1751102237Spirzyk 175261877Sume#ifdef DEBUG 175361877Sumestatic const char AskedForGot[] = 175461877Sume "gethostby*.getanswer: asked for \"%s\", got \"%s\""; 175561877Sume#endif 175661877Sume 175761877Sumestatic struct addrinfo * 1758157119Sumegetanswer(const querybuf *answer, int anslen, const char *qname, int qtype, 1759157119Sume const struct addrinfo *pai, res_state res) 176061877Sume{ 176161877Sume struct addrinfo sentinel, *cur; 176261877Sume struct addrinfo ai; 176361877Sume const struct afd *afd; 176461877Sume char *canonname; 176561877Sume const HEADER *hp; 176661877Sume const u_char *cp; 176761877Sume int n; 176861877Sume const u_char *eom; 1769105940Sume char *bp, *ep; 1770105940Sume int type, class, ancount, qdcount; 177161877Sume int haveanswer, had_error; 177261877Sume char tbuf[MAXDNAME]; 177392905Sobrien int (*name_ok)(const char *); 177461877Sume char hostbuf[8*1024]; 177561877Sume 177661877Sume memset(&sentinel, 0, sizeof(sentinel)); 177761877Sume cur = &sentinel; 177861877Sume 177961877Sume canonname = NULL; 178061877Sume eom = answer->buf + anslen; 178161877Sume switch (qtype) { 178261877Sume case T_A: 178361877Sume case T_AAAA: 178461877Sume case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/ 178561877Sume name_ok = res_hnok; 178661877Sume break; 178761877Sume default: 178861877Sume return (NULL); /* XXX should be abort(); */ 178961877Sume } 179061877Sume /* 179161877Sume * find first satisfactory answer 179261877Sume */ 179361877Sume hp = &answer->hdr; 179461877Sume ancount = ntohs(hp->ancount); 179561877Sume qdcount = ntohs(hp->qdcount); 179661877Sume bp = hostbuf; 1797105940Sume ep = hostbuf + sizeof hostbuf; 179861877Sume cp = answer->buf + HFIXEDSZ; 179961877Sume if (qdcount != 1) { 1800156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 180161877Sume return (NULL); 180261877Sume } 1803105940Sume n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 180461877Sume if ((n < 0) || !(*name_ok)(bp)) { 1805156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 180661877Sume return (NULL); 180761877Sume } 180861877Sume cp += n + QFIXEDSZ; 180961877Sume if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) { 181061877Sume /* res_send() has already verified that the query name is the 181161877Sume * same as the one we sent; this just gets the expanded name 181261877Sume * (i.e., with the succeeding search-domain tacked on). 181361877Sume */ 181461877Sume n = strlen(bp) + 1; /* for the \0 */ 181561877Sume if (n >= MAXHOSTNAMELEN) { 1816156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 181761877Sume return (NULL); 181861877Sume } 181961877Sume canonname = bp; 182061877Sume bp += n; 182161877Sume /* The qname can be abbreviated, but h_name is now absolute. */ 182261877Sume qname = canonname; 182361877Sume } 182461877Sume haveanswer = 0; 182561877Sume had_error = 0; 182661877Sume while (ancount-- > 0 && cp < eom && !had_error) { 1827105940Sume n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 182861877Sume if ((n < 0) || !(*name_ok)(bp)) { 182961877Sume had_error++; 183061877Sume continue; 183161877Sume } 183261877Sume cp += n; /* name */ 183361877Sume type = _getshort(cp); 183461877Sume cp += INT16SZ; /* type */ 183561877Sume class = _getshort(cp); 183661877Sume cp += INT16SZ + INT32SZ; /* class, TTL */ 183761877Sume n = _getshort(cp); 183861877Sume cp += INT16SZ; /* len */ 183961877Sume if (class != C_IN) { 184061877Sume /* XXX - debug? syslog? */ 184161877Sume cp += n; 184261877Sume continue; /* XXX - had_error++ ? */ 184361877Sume } 184461877Sume if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) && 184561877Sume type == T_CNAME) { 184661877Sume n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 184761877Sume if ((n < 0) || !(*name_ok)(tbuf)) { 184861877Sume had_error++; 184961877Sume continue; 185061877Sume } 185161877Sume cp += n; 185261877Sume /* Get canonical name. */ 185361877Sume n = strlen(tbuf) + 1; /* for the \0 */ 1854105940Sume if (n > ep - bp || n >= MAXHOSTNAMELEN) { 185561877Sume had_error++; 185661877Sume continue; 185761877Sume } 1858114443Snectar strlcpy(bp, tbuf, ep - bp); 185961877Sume canonname = bp; 186061877Sume bp += n; 186161877Sume continue; 186261877Sume } 186361877Sume if (qtype == T_ANY) { 186461877Sume if (!(type == T_A || type == T_AAAA)) { 186561877Sume cp += n; 186661877Sume continue; 186761877Sume } 186861877Sume } else if (type != qtype) { 186961877Sume#ifdef DEBUG 187061877Sume if (type != T_KEY && type != T_SIG) 187161877Sume syslog(LOG_NOTICE|LOG_AUTH, 187261877Sume "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", 187361877Sume qname, p_class(C_IN), p_type(qtype), 187461877Sume p_type(type)); 187561877Sume#endif 187661877Sume cp += n; 187761877Sume continue; /* XXX - had_error++ ? */ 187861877Sume } 187961877Sume switch (type) { 188061877Sume case T_A: 188161877Sume case T_AAAA: 188261877Sume if (strcasecmp(canonname, bp) != 0) { 188361877Sume#ifdef DEBUG 188461877Sume syslog(LOG_NOTICE|LOG_AUTH, 188561877Sume AskedForGot, canonname, bp); 188661877Sume#endif 188761877Sume cp += n; 188861877Sume continue; /* XXX - had_error++ ? */ 188961877Sume } 189061877Sume if (type == T_A && n != INADDRSZ) { 189161877Sume cp += n; 189261877Sume continue; 189361877Sume } 189461877Sume if (type == T_AAAA && n != IN6ADDRSZ) { 189561877Sume cp += n; 189661877Sume continue; 189761877Sume } 189861877Sume#ifdef FILTER_V4MAPPED 189961877Sume if (type == T_AAAA) { 190061877Sume struct in6_addr in6; 190161877Sume memcpy(&in6, cp, sizeof(in6)); 190261877Sume if (IN6_IS_ADDR_V4MAPPED(&in6)) { 190361877Sume cp += n; 190461877Sume continue; 190561877Sume } 190661877Sume } 190761877Sume#endif 190861877Sume if (!haveanswer) { 190961877Sume int nn; 191061877Sume 191161877Sume canonname = bp; 191261877Sume nn = strlen(bp) + 1; /* for the \0 */ 191361877Sume bp += nn; 191461877Sume } 191561877Sume 191661877Sume /* don't overwrite pai */ 191761877Sume ai = *pai; 191861877Sume ai.ai_family = (type == T_A) ? AF_INET : AF_INET6; 191961877Sume afd = find_afd(ai.ai_family); 192061877Sume if (afd == NULL) { 192161877Sume cp += n; 192261877Sume continue; 192361877Sume } 192461877Sume cur->ai_next = get_ai(&ai, afd, (const char *)cp); 192561877Sume if (cur->ai_next == NULL) 192661877Sume had_error++; 192761877Sume while (cur && cur->ai_next) 192861877Sume cur = cur->ai_next; 192961877Sume cp += n; 193061877Sume break; 193161877Sume default: 193261877Sume abort(); 193361877Sume } 193461877Sume if (!had_error) 193561877Sume haveanswer++; 193661877Sume } 193761877Sume if (haveanswer) { 1938102237Spirzyk#if defined(RESOLVSORT) 1939102237Spirzyk /* 1940102237Spirzyk * We support only IPv4 address for backward 1941102237Spirzyk * compatibility against gethostbyname(3). 1942102237Spirzyk */ 1943156960Sume if (res->nsort && qtype == T_A) { 1944156960Sume if (addr4sort(&sentinel, res) < 0) { 1945102237Spirzyk freeaddrinfo(sentinel.ai_next); 1946156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 1947102237Spirzyk return NULL; 1948102237Spirzyk } 1949102237Spirzyk } 1950102237Spirzyk#endif /*RESOLVSORT*/ 195161877Sume if (!canonname) 195261877Sume (void)get_canonname(pai, sentinel.ai_next, qname); 195361877Sume else 195461877Sume (void)get_canonname(pai, sentinel.ai_next, canonname); 1955156960Sume RES_SET_H_ERRNO(res, NETDB_SUCCESS); 195661877Sume return sentinel.ai_next; 195761877Sume } 195861877Sume 1959156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 196061877Sume return NULL; 196161877Sume} 196261877Sume 1963121426Sume#ifdef RESOLVSORT 1964121426Sumestruct addr_ptr { 1965121426Sume struct addrinfo *ai; 1966121426Sume int aval; 1967121426Sume}; 1968121426Sume 1969121426Sumestatic int 1970156960Sumeaddr4sort(struct addrinfo *sentinel, res_state res) 1971121426Sume{ 1972121426Sume struct addrinfo *ai; 1973121426Sume struct addr_ptr *addrs, addr; 1974121426Sume struct sockaddr_in *sin; 1975121426Sume int naddrs, i, j; 1976121426Sume int needsort = 0; 1977121426Sume 1978121426Sume if (!sentinel) 1979121426Sume return -1; 1980121426Sume naddrs = 0; 1981121426Sume for (ai = sentinel->ai_next; ai; ai = ai->ai_next) 1982121426Sume naddrs++; 1983121426Sume if (naddrs < 2) 1984121426Sume return 0; /* We don't need sorting. */ 1985121426Sume if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL) 1986121426Sume return -1; 1987121426Sume i = 0; 1988121426Sume for (ai = sentinel->ai_next; ai; ai = ai->ai_next) { 1989121426Sume sin = (struct sockaddr_in *)ai->ai_addr; 1990156960Sume for (j = 0; (unsigned)j < res->nsort; j++) { 1991157119Sume if (res->sort_list[j].addr.s_addr == 1992156960Sume (sin->sin_addr.s_addr & res->sort_list[j].mask)) 1993121426Sume break; 1994121426Sume } 1995121426Sume addrs[i].ai = ai; 1996121426Sume addrs[i].aval = j; 1997121426Sume if (needsort == 0 && i > 0 && j < addrs[i - 1].aval) 1998121426Sume needsort = i; 1999121426Sume i++; 2000121426Sume } 2001121426Sume if (!needsort) { 2002121426Sume free(addrs); 2003121426Sume return 0; 2004121426Sume } 2005121426Sume 2006121426Sume while (needsort < naddrs) { 2007157371Sume for (j = needsort - 1; j >= 0; j--) { 2008157371Sume if (addrs[j].aval > addrs[j+1].aval) { 2009157371Sume addr = addrs[j]; 2010157371Sume addrs[j] = addrs[j + 1]; 2011157371Sume addrs[j + 1] = addr; 2012157371Sume } else 2013157371Sume break; 2014157371Sume } 2015157371Sume needsort++; 2016121426Sume } 2017121426Sume 2018121426Sume ai = sentinel; 2019121426Sume for (i = 0; i < naddrs; ++i) { 2020121426Sume ai->ai_next = addrs[i].ai; 2021121426Sume ai = ai->ai_next; 2022121426Sume } 2023121426Sume ai->ai_next = NULL; 2024121426Sume free(addrs); 2025121426Sume return 0; 2026121426Sume} 2027121426Sume#endif /*RESOLVSORT*/ 2028121426Sume 202961877Sume/*ARGSUSED*/ 203061877Sumestatic int 2031157119Sume_dns_getaddrinfo(void *rv, void *cb_data, va_list ap) 203261877Sume{ 203361877Sume struct addrinfo *ai; 2034103357Sume querybuf *buf, *buf2; 2035130600Sume const char *hostname; 203665532Snectar const struct addrinfo *pai; 203761877Sume struct addrinfo sentinel, *cur; 203861877Sume struct res_target q, q2; 2039156960Sume res_state res; 204061877Sume 2041130600Sume hostname = va_arg(ap, char *); 204265532Snectar pai = va_arg(ap, const struct addrinfo *); 204365532Snectar 2044156946Sdelphij memset(&q, 0, sizeof(q)); 204561877Sume memset(&q2, 0, sizeof(q2)); 204661877Sume memset(&sentinel, 0, sizeof(sentinel)); 204761877Sume cur = &sentinel; 204861877Sume 2049103357Sume buf = malloc(sizeof(*buf)); 2050103357Sume if (!buf) { 2051156960Sume RES_SET_H_ERRNO(res, NETDB_INTERNAL); 2052103357Sume return NS_NOTFOUND; 2053103357Sume } 2054103357Sume buf2 = malloc(sizeof(*buf2)); 2055103357Sume if (!buf2) { 2056103357Sume free(buf); 2057156960Sume RES_SET_H_ERRNO(res, NETDB_INTERNAL); 2058103357Sume return NS_NOTFOUND; 2059103357Sume } 2060103357Sume 206161877Sume switch (pai->ai_family) { 206261877Sume case AF_UNSPEC: 2063130600Sume q.name = hostname; 206462614Sitojun q.qclass = C_IN; 2065140896Sume q.qtype = T_A; 2066103357Sume q.answer = buf->buf; 2067103357Sume q.anslen = sizeof(buf->buf); 206861877Sume q.next = &q2; 2069130600Sume q2.name = hostname; 207062614Sitojun q2.qclass = C_IN; 2071140896Sume q2.qtype = T_AAAA; 2072103357Sume q2.answer = buf2->buf; 2073103357Sume q2.anslen = sizeof(buf2->buf); 207461877Sume break; 207561877Sume case AF_INET: 2076130600Sume q.name = hostname; 207762614Sitojun q.qclass = C_IN; 207862614Sitojun q.qtype = T_A; 2079103357Sume q.answer = buf->buf; 2080103357Sume q.anslen = sizeof(buf->buf); 208161877Sume break; 208261877Sume case AF_INET6: 2083130600Sume q.name = hostname; 208462614Sitojun q.qclass = C_IN; 208562614Sitojun q.qtype = T_AAAA; 2086103357Sume q.answer = buf->buf; 2087103357Sume q.anslen = sizeof(buf->buf); 208861877Sume break; 208961877Sume default: 2090103357Sume free(buf); 2091103357Sume free(buf2); 209265532Snectar return NS_UNAVAIL; 209361877Sume } 2094156960Sume 2095156960Sume res = __res_state(); 2096156960Sume if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) { 2097156960Sume RES_SET_H_ERRNO(res, NETDB_INTERNAL); 2098103357Sume free(buf); 2099103357Sume free(buf2); 210065532Snectar return NS_NOTFOUND; 2101103357Sume } 2102156960Sume 2103156960Sume if (res_searchN(hostname, &q, res) < 0) { 2104156960Sume free(buf); 2105156960Sume free(buf2); 2106156960Sume return NS_NOTFOUND; 2107156960Sume } 2108140896Sume /* prefer IPv6 */ 210961877Sume if (q.next) { 2110156960Sume ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res); 2111140896Sume if (ai) { 211261877Sume cur->ai_next = ai; 2113140896Sume while (cur && cur->ai_next) 2114140896Sume cur = cur->ai_next; 2115140896Sume } 211661877Sume } 2117156960Sume ai = getanswer(buf, q.n, q.name, q.qtype, pai, res); 2118140896Sume if (ai) 2119140896Sume cur->ai_next = ai; 2120103357Sume free(buf); 2121103357Sume free(buf2); 212261877Sume if (sentinel.ai_next == NULL) 2123156960Sume switch (res->res_h_errno) { 212461877Sume case HOST_NOT_FOUND: 212565532Snectar return NS_NOTFOUND; 212661877Sume case TRY_AGAIN: 212765532Snectar return NS_TRYAGAIN; 212861877Sume default: 212965532Snectar return NS_UNAVAIL; 213061877Sume } 213165532Snectar *((struct addrinfo **)rv) = sentinel.ai_next; 213265532Snectar return NS_SUCCESS; 213361877Sume} 213461877Sume 213565532Snectarstatic void 2136144634Sume_sethtent(FILE **hostf) 213765532Snectar{ 2138144634Sume if (!*hostf) 2139144634Sume *hostf = fopen(_PATH_HOSTS, "r"); 214065532Snectar else 2141144634Sume rewind(*hostf); 214265532Snectar} 214365532Snectar 214465532Snectarstatic void 2145144634Sume_endhtent(FILE **hostf) 214665532Snectar{ 2147144634Sume if (*hostf) { 2148144634Sume (void) fclose(*hostf); 2149144634Sume *hostf = NULL; 215065532Snectar } 215165532Snectar} 215265532Snectar 215361877Sumestatic struct addrinfo * 2154144634Sume_gethtent(FILE **hostf, const char *name, const struct addrinfo *pai) 215561877Sume{ 215661877Sume char *p; 215761877Sume char *cp, *tname, *cname; 215861877Sume struct addrinfo hints, *res0, *res; 215961877Sume int error; 216061877Sume const char *addr; 216161877Sume char hostbuf[8*1024]; 216261877Sume 2163144634Sume if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "r"))) 216465532Snectar return (NULL); 2165105940Sumeagain: 2166144634Sume if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf))) 216761877Sume return (NULL); 216861877Sume if (*p == '#') 216961877Sume goto again; 2170139612Ssobomax cp = strpbrk(p, "#\n"); 2171139612Ssobomax if (cp != NULL) 2172139612Ssobomax *cp = '\0'; 217361877Sume if (!(cp = strpbrk(p, " \t"))) 217461877Sume goto again; 217561877Sume *cp++ = '\0'; 217661877Sume addr = p; 217761877Sume cname = NULL; 217861877Sume /* if this is not something we're looking for, skip it. */ 217961877Sume while (cp && *cp) { 218061877Sume if (*cp == ' ' || *cp == '\t') { 218161877Sume cp++; 218261877Sume continue; 218361877Sume } 218461877Sume tname = cp; 218561877Sume if (cname == NULL) 218661877Sume cname = cp; 218761877Sume if ((cp = strpbrk(cp, " \t")) != NULL) 218861877Sume *cp++ = '\0'; 218961877Sume if (strcasecmp(name, tname) == 0) 219061877Sume goto found; 219161877Sume } 219261877Sume goto again; 219361877Sume 219461877Sumefound: 2195105940Sume /* we should not glob socktype/protocol here */ 2196105940Sume memset(&hints, 0, sizeof(hints)); 2197105940Sume hints.ai_family = pai->ai_family; 2198105940Sume hints.ai_socktype = SOCK_DGRAM; 2199105940Sume hints.ai_protocol = 0; 220061877Sume hints.ai_flags = AI_NUMERICHOST; 2201105940Sume error = getaddrinfo(addr, "0", &hints, &res0); 220261877Sume if (error) 220361877Sume goto again; 220461877Sume#ifdef FILTER_V4MAPPED 220561877Sume /* XXX should check all items in the chain */ 220661877Sume if (res0->ai_family == AF_INET6 && 220761877Sume IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) { 220861877Sume freeaddrinfo(res0); 220961877Sume goto again; 221061877Sume } 221161877Sume#endif 221261877Sume for (res = res0; res; res = res->ai_next) { 221361877Sume /* cover it up */ 221461877Sume res->ai_flags = pai->ai_flags; 2215105940Sume res->ai_socktype = pai->ai_socktype; 2216105940Sume res->ai_protocol = pai->ai_protocol; 221761877Sume 221861877Sume if (pai->ai_flags & AI_CANONNAME) { 221961877Sume if (get_canonname(pai, res, cname) != 0) { 222061877Sume freeaddrinfo(res0); 222161877Sume goto again; 222261877Sume } 222361877Sume } 222461877Sume } 222561877Sume return res0; 222661877Sume} 222761877Sume 222861877Sume/*ARGSUSED*/ 222961877Sumestatic int 2230157119Sume_files_getaddrinfo(void *rv, void *cb_data, va_list ap) 223165532Snectar{ 223265532Snectar const char *name; 223361877Sume const struct addrinfo *pai; 223461877Sume struct addrinfo sentinel, *cur; 223561877Sume struct addrinfo *p; 2236144634Sume FILE *hostf = NULL; 223761877Sume 223865532Snectar name = va_arg(ap, char *); 223965532Snectar pai = va_arg(ap, struct addrinfo *); 224065532Snectar 224165532Snectar memset(&sentinel, 0, sizeof(sentinel)); 224261877Sume cur = &sentinel; 224361877Sume 2244144634Sume _sethtent(&hostf); 2245144634Sume while ((p = _gethtent(&hostf, name, pai)) != NULL) { 224661877Sume cur->ai_next = p; 224761877Sume while (cur && cur->ai_next) 224861877Sume cur = cur->ai_next; 224961877Sume } 2250144634Sume _endhtent(&hostf); 225161877Sume 225265532Snectar *((struct addrinfo **)rv) = sentinel.ai_next; 225365532Snectar if (sentinel.ai_next == NULL) 225465532Snectar return NS_NOTFOUND; 225565532Snectar return NS_SUCCESS; 225661877Sume} 225761877Sume 225861877Sume#ifdef YP 225961877Sume/*ARGSUSED*/ 226065532Snectarstatic struct addrinfo * 2261157119Sume_yphostent(char *line, const struct addrinfo *pai) 226261877Sume{ 226361877Sume struct addrinfo sentinel, *cur; 226465532Snectar struct addrinfo hints, *res, *res0; 226561877Sume int error; 226665532Snectar char *p = line; 226765532Snectar const char *addr, *canonname; 226865532Snectar char *nextline; 226965532Snectar char *cp; 227061877Sume 227165532Snectar addr = canonname = NULL; 227265532Snectar 227365532Snectar memset(&sentinel, 0, sizeof(sentinel)); 227461877Sume cur = &sentinel; 227561877Sume 227665532Snectarnextline: 227765532Snectar /* terminate line */ 227865532Snectar cp = strchr(p, '\n'); 227965532Snectar if (cp) { 228065532Snectar *cp++ = '\0'; 228165532Snectar nextline = cp; 228265532Snectar } else 228365532Snectar nextline = NULL; 228461877Sume 228565532Snectar cp = strpbrk(p, " \t"); 228665532Snectar if (cp == NULL) { 228765532Snectar if (canonname == NULL) 228865532Snectar return (NULL); 228965532Snectar else 229065532Snectar goto done; 229161877Sume } 229265532Snectar *cp++ = '\0'; 229361877Sume 229465532Snectar addr = p; 229561877Sume 229665532Snectar while (cp && *cp) { 229765532Snectar if (*cp == ' ' || *cp == '\t') { 229865532Snectar cp++; 229961877Sume continue; 230065532Snectar } 230165532Snectar if (!canonname) 230265532Snectar canonname = cp; 230365532Snectar if ((cp = strpbrk(cp, " \t")) != NULL) 230465532Snectar *cp++ = '\0'; 230565532Snectar } 230661877Sume 2307121474Sume hints = *pai; 230865532Snectar hints.ai_flags = AI_NUMERICHOST; 2309121474Sume error = getaddrinfo(addr, NULL, &hints, &res0); 231065532Snectar if (error == 0) { 231165532Snectar for (res = res0; res; res = res->ai_next) { 231265532Snectar /* cover it up */ 231365532Snectar res->ai_flags = pai->ai_flags; 231461877Sume 231565532Snectar if (pai->ai_flags & AI_CANONNAME) 231665532Snectar (void)get_canonname(pai, res, canonname); 231761877Sume } 231865532Snectar } else 231965532Snectar res0 = NULL; 232065532Snectar if (res0) { 232165532Snectar cur->ai_next = res0; 232261877Sume while (cur && cur->ai_next) 232361877Sume cur = cur->ai_next; 232461877Sume } 232561877Sume 232665532Snectar if (nextline) { 232765532Snectar p = nextline; 232865532Snectar goto nextline; 232965532Snectar } 233061877Sume 233165532Snectardone: 233265532Snectar return sentinel.ai_next; 233361877Sume} 233465532Snectar 233565532Snectar/*ARGSUSED*/ 233665532Snectarstatic int 2337157119Sume_yp_getaddrinfo(void *rv, void *cb_data, va_list ap) 233865532Snectar{ 233965532Snectar struct addrinfo sentinel, *cur; 234065532Snectar struct addrinfo *ai = NULL; 2341144679Sume char *ypbuf; 2342144679Sume int ypbuflen, r; 234365532Snectar const char *name; 234465532Snectar const struct addrinfo *pai; 2345144679Sume char *ypdomain; 234665532Snectar 2347144679Sume if (_yp_check(&ypdomain) == 0) 2348144679Sume return NS_UNAVAIL; 2349144679Sume 235065532Snectar name = va_arg(ap, char *); 235165532Snectar pai = va_arg(ap, const struct addrinfo *); 235265532Snectar 235365532Snectar memset(&sentinel, 0, sizeof(sentinel)); 235465532Snectar cur = &sentinel; 235565532Snectar 235665532Snectar /* hosts.byname is only for IPv4 (Solaris8) */ 235765532Snectar if (pai->ai_family == PF_UNSPEC || pai->ai_family == PF_INET) { 2358144679Sume r = yp_match(ypdomain, "hosts.byname", name, 2359144679Sume (int)strlen(name), &ypbuf, &ypbuflen); 236065532Snectar if (r == 0) { 236165532Snectar struct addrinfo ai4; 236265532Snectar 236365532Snectar ai4 = *pai; 236465532Snectar ai4.ai_family = AF_INET; 2365144679Sume ai = _yphostent(ypbuf, &ai4); 236665532Snectar if (ai) { 236765532Snectar cur->ai_next = ai; 236865532Snectar while (cur && cur->ai_next) 236965532Snectar cur = cur->ai_next; 237065532Snectar } 2371146190Sume free(ypbuf); 237265532Snectar } 237365532Snectar } 237465532Snectar 237565532Snectar /* ipnodes.byname can hold both IPv4/v6 */ 2376144679Sume r = yp_match(ypdomain, "ipnodes.byname", name, 2377144679Sume (int)strlen(name), &ypbuf, &ypbuflen); 237865532Snectar if (r == 0) { 2379144679Sume ai = _yphostent(ypbuf, pai); 2380144679Sume if (ai) 238165532Snectar cur->ai_next = ai; 2382144679Sume free(ypbuf); 238365532Snectar } 238465532Snectar 238565532Snectar if (sentinel.ai_next == NULL) { 2386156960Sume RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND); 238765532Snectar return NS_NOTFOUND; 238865532Snectar } 238965532Snectar *((struct addrinfo **)rv) = sentinel.ai_next; 239065532Snectar return NS_SUCCESS; 239165532Snectar} 239261877Sume#endif 239361877Sume 239461877Sume/* resolver logic */ 239561877Sume 239661877Sume/* 239761877Sume * Formulate a normal query, send, and await answer. 239861877Sume * Returned answer is placed in supplied buffer "answer". 239961877Sume * Perform preliminary check of answer, returning success only 240061877Sume * if no error is indicated and the answer count is nonzero. 240161877Sume * Return the size of the response on success, -1 on error. 240261877Sume * Error number is left in h_errno. 240361877Sume * 240461877Sume * Caller must parse answer and determine whether it answers the question. 240561877Sume */ 240661877Sumestatic int 2407157119Sumeres_queryN(const char *name, struct res_target *target, res_state res) 240861877Sume{ 2409103357Sume u_char *buf; 241061877Sume HEADER *hp; 241161877Sume int n; 2412157203Sume u_int oflags; 241361877Sume struct res_target *t; 241461877Sume int rcode; 241561877Sume int ancount; 241661877Sume 241761877Sume rcode = NOERROR; 241861877Sume ancount = 0; 241961877Sume 2420103357Sume buf = malloc(MAXPACKET); 2421103357Sume if (!buf) { 2422156960Sume RES_SET_H_ERRNO(res, NETDB_INTERNAL); 2423103357Sume return -1; 2424103357Sume } 2425103357Sume 242661877Sume for (t = target; t; t = t->next) { 242761877Sume int class, type; 242861877Sume u_char *answer; 242961877Sume int anslen; 243061877Sume 243161877Sume hp = (HEADER *)(void *)t->answer; 243261877Sume 243361877Sume /* make it easier... */ 243462614Sitojun class = t->qclass; 243562614Sitojun type = t->qtype; 243661877Sume answer = t->answer; 243761877Sume anslen = t->anslen; 2438157203Sume 2439157203Sume oflags = res->_flags; 2440157203Sume 2441157203Sumeagain: 2442157203Sume hp->rcode = NOERROR; /* default */ 2443157203Sume 244461877Sume#ifdef DEBUG 2445156960Sume if (res->options & RES_DEBUG) 244661877Sume printf(";; res_query(%s, %d, %d)\n", name, class, type); 244761877Sume#endif 244861877Sume 2449156960Sume n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL, 2450103357Sume buf, MAXPACKET); 2451157203Sume if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 && 2452157203Sume (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U) 2453156960Sume n = res_nopt(res, n, buf, MAXPACKET, anslen); 245461877Sume if (n <= 0) { 245561877Sume#ifdef DEBUG 2456156960Sume if (res->options & RES_DEBUG) 245761877Sume printf(";; res_query: mkquery failed\n"); 245861877Sume#endif 2459103357Sume free(buf); 2460156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 246161877Sume return (n); 246261877Sume } 2463156960Sume n = res_nsend(res, buf, n, answer, anslen); 246461877Sume if (n < 0) { 2465157203Sume /* 2466157203Sume * if the query choked with EDNS0, retry 2467157203Sume * without EDNS0 2468157203Sume */ 2469157203Sume if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) 2470157203Sume != 0U && 2471157203Sume ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) { 2472157203Sume res->_flags |= RES_F_EDNS0ERR; 2473157203Sume if (res->options & RES_DEBUG) 2474157203Sume printf(";; res_nquery: retry without EDNS0\n"); 2475157203Sume goto again; 2476157203Sume } 2477157203Sume rcode = hp->rcode; /* record most recent error */ 247861877Sume#ifdef DEBUG 2479156960Sume if (res->options & RES_DEBUG) 248061877Sume printf(";; res_query: send error\n"); 248161877Sume#endif 2482157203Sume continue; 248361877Sume } 248461877Sume 2485157081Sume if (n > anslen) 2486103350Snectar hp->rcode = FORMERR; /* XXX not very informative */ 2487157203Sume if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) { 248861877Sume rcode = hp->rcode; /* record most recent error */ 248961877Sume#ifdef DEBUG 2490156960Sume if (res->options & RES_DEBUG) 2491105940Sume printf(";; rcode = %u, ancount=%u\n", hp->rcode, 249261877Sume ntohs(hp->ancount)); 249361877Sume#endif 249461877Sume continue; 249561877Sume } 249661877Sume 249761877Sume ancount += ntohs(hp->ancount); 249861877Sume 249961877Sume t->n = n; 250061877Sume } 250161877Sume 2502103357Sume free(buf); 2503103357Sume 250461877Sume if (ancount == 0) { 250561877Sume switch (rcode) { 250661877Sume case NXDOMAIN: 2507156960Sume RES_SET_H_ERRNO(res, HOST_NOT_FOUND); 250861877Sume break; 250961877Sume case SERVFAIL: 2510156960Sume RES_SET_H_ERRNO(res, TRY_AGAIN); 251161877Sume break; 251261877Sume case NOERROR: 2513156960Sume RES_SET_H_ERRNO(res, NO_DATA); 251461877Sume break; 251561877Sume case FORMERR: 251661877Sume case NOTIMP: 251761877Sume case REFUSED: 251861877Sume default: 2519156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 252061877Sume break; 252161877Sume } 252261877Sume return (-1); 252361877Sume } 252461877Sume return (ancount); 252561877Sume} 252661877Sume 252761877Sume/* 252861877Sume * Formulate a normal query, send, and retrieve answer in supplied buffer. 252961877Sume * Return the size of the response on success, -1 on error. 253061877Sume * If enabled, implement search rules until answer or unrecoverable failure 253161877Sume * is detected. Error code, if any, is left in h_errno. 253261877Sume */ 253361877Sumestatic int 2534157119Sumeres_searchN(const char *name, struct res_target *target, res_state res) 253561877Sume{ 253661877Sume const char *cp, * const *domain; 253761877Sume HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/ 253861877Sume u_int dots; 253961877Sume int trailing_dot, ret, saved_herrno; 2540155983Sume int got_nodata = 0, got_servfail = 0, root_on_list = 0; 2541155983Sume int tried_as_is = 0; 2542155983Sume int searched = 0; 2543145113Sume char abuf[MAXDNAME]; 254461877Sume 254561877Sume errno = 0; 2546156960Sume RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */ 254761877Sume dots = 0; 254861877Sume for (cp = name; *cp; cp++) 254961877Sume dots += (*cp == '.'); 255061877Sume trailing_dot = 0; 255161877Sume if (cp > name && *--cp == '.') 255261877Sume trailing_dot++; 255361877Sume 255461877Sume /* 255561877Sume * if there aren't any dots, it could be a user-level alias 255661877Sume */ 2557156960Sume if (!dots && 2558156960Sume (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL) 2559156960Sume return (res_queryN(cp, target, res)); 256061877Sume 256161877Sume /* 2562155983Sume * If there are enough dots in the name, let's just give it a 2563155983Sume * try 'as is'. The threshold can be set with the "ndots" option. 2564155983Sume * Also, query 'as is', if there is a trailing dot in the name. 256561877Sume */ 256661877Sume saved_herrno = -1; 2567156960Sume if (dots >= res->ndots || trailing_dot) { 2568156960Sume ret = res_querydomainN(name, NULL, target, res); 2569155983Sume if (ret > 0 || trailing_dot) 257061877Sume return (ret); 2571156155Sume if (errno == ECONNREFUSED) { 2572156960Sume RES_SET_H_ERRNO(res, TRY_AGAIN); 2573156155Sume return (-1); 2574156155Sume } 2575156960Sume switch (res->res_h_errno) { 2576156155Sume case NO_DATA: 2577156155Sume case HOST_NOT_FOUND: 2578156155Sume break; 2579157093Sume case TRY_AGAIN: 2580157093Sume if (hp->rcode == SERVFAIL) 2581157093Sume break; 2582157093Sume /* FALLTHROUGH */ 2583156155Sume default: 2584156155Sume return (-1); 2585156155Sume } 2586156960Sume saved_herrno = res->res_h_errno; 258761877Sume tried_as_is++; 258861877Sume } 258961877Sume 259061877Sume /* 259161877Sume * We do at least one level of search if 259261877Sume * - there is no dot and RES_DEFNAME is set, or 259361877Sume * - there is at least one dot, there is no trailing dot, 259461877Sume * and RES_DNSRCH is set. 259561877Sume */ 2596156960Sume if ((!dots && (res->options & RES_DEFNAMES)) || 2597156960Sume (dots && !trailing_dot && (res->options & RES_DNSRCH))) { 259861877Sume int done = 0; 259961877Sume 2600156960Sume for (domain = (const char * const *)res->dnsrch; 260161877Sume *domain && !done; 260261877Sume domain++) { 2603155983Sume searched = 1; 260461877Sume 2605155983Sume if (domain[0][0] == '\0' || 2606155983Sume (domain[0][0] == '.' && domain[0][1] == '\0')) 2607155983Sume root_on_list++; 2608155983Sume 2609155983Sume if (root_on_list && tried_as_is) 2610155983Sume continue; 2611155983Sume 2612156960Sume ret = res_querydomainN(name, *domain, target, res); 261361877Sume if (ret > 0) 261461877Sume return (ret); 261561877Sume 261661877Sume /* 261761877Sume * If no server present, give up. 261861877Sume * If name isn't found in this domain, 261961877Sume * keep trying higher domains in the search list 262061877Sume * (if that's enabled). 262161877Sume * On a NO_DATA error, keep trying, otherwise 262261877Sume * a wildcard entry of another type could keep us 262361877Sume * from finding this entry higher in the domain. 262461877Sume * If we get some other error (negative answer or 262561877Sume * server failure), then stop searching up, 262661877Sume * but try the input name below in case it's 262761877Sume * fully-qualified. 262861877Sume */ 262961877Sume if (errno == ECONNREFUSED) { 2630156960Sume RES_SET_H_ERRNO(res, TRY_AGAIN); 263161877Sume return (-1); 263261877Sume } 263361877Sume 2634156960Sume switch (res->res_h_errno) { 263561877Sume case NO_DATA: 263661877Sume got_nodata++; 263761877Sume /* FALLTHROUGH */ 263861877Sume case HOST_NOT_FOUND: 263961877Sume /* keep trying */ 264061877Sume break; 264161877Sume case TRY_AGAIN: 2642157093Sume got_servfail++; 264361877Sume if (hp->rcode == SERVFAIL) { 264461877Sume /* try next search element, if any */ 264561877Sume break; 264661877Sume } 264761877Sume /* FALLTHROUGH */ 264861877Sume default: 264961877Sume /* anything else implies that we're done */ 265061877Sume done++; 265161877Sume } 265261877Sume /* 265361877Sume * if we got here for some reason other than DNSRCH, 265461877Sume * we only wanted one iteration of the loop, so stop. 265561877Sume */ 2656156960Sume if (!(res->options & RES_DNSRCH)) 265761877Sume done++; 265861877Sume } 265961877Sume } 266061877Sume 2661156960Sume switch (res->res_h_errno) { 2662156155Sume case NO_DATA: 2663156155Sume case HOST_NOT_FOUND: 2664156155Sume break; 2665157093Sume case TRY_AGAIN: 2666157093Sume if (hp->rcode == SERVFAIL) 2667157093Sume break; 2668157093Sume /* FALLTHROUGH */ 2669156155Sume default: 2670156155Sume goto giveup; 2671156155Sume } 2672156155Sume 267361877Sume /* 2674155983Sume * If the query has not already been tried as is then try it 2675155983Sume * unless RES_NOTLDQUERY is set and there were no dots. 267661877Sume */ 2677156960Sume if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) && 2678155983Sume !(tried_as_is || root_on_list)) { 2679156960Sume ret = res_querydomainN(name, NULL, target, res); 268061877Sume if (ret > 0) 268161877Sume return (ret); 268261877Sume } 268361877Sume 268461877Sume /* 268561877Sume * if we got here, we didn't satisfy the search. 268661877Sume * if we did an initial full query, return that query's h_errno 268761877Sume * (note that we wouldn't be here if that query had succeeded). 268861877Sume * else if we ever got a nodata, send that back as the reason. 268961877Sume * else send back meaningless h_errno, that being the one from 269061877Sume * the last DNSRCH we did. 269161877Sume */ 2692156155Sumegiveup: 269361877Sume if (saved_herrno != -1) 2694156960Sume RES_SET_H_ERRNO(res, saved_herrno); 269561877Sume else if (got_nodata) 2696156960Sume RES_SET_H_ERRNO(res, NO_DATA); 269761877Sume else if (got_servfail) 2698156960Sume RES_SET_H_ERRNO(res, TRY_AGAIN); 269961877Sume return (-1); 270061877Sume} 270161877Sume 270261877Sume/* 270361877Sume * Perform a call on res_query on the concatenation of name and domain, 270461877Sume * removing a trailing dot from name if domain is NULL. 270561877Sume */ 270661877Sumestatic int 2707157119Sumeres_querydomainN(const char *name, const char *domain, 2708157119Sume struct res_target *target, res_state res) 270961877Sume{ 271061877Sume char nbuf[MAXDNAME]; 271161877Sume const char *longname = nbuf; 271261877Sume size_t n, d; 271361877Sume 271461877Sume#ifdef DEBUG 2715156960Sume if (res->options & RES_DEBUG) 271661877Sume printf(";; res_querydomain(%s, %s)\n", 271761877Sume name, domain?domain:"<Nil>"); 271861877Sume#endif 271961877Sume if (domain == NULL) { 272061877Sume /* 272161877Sume * Check for trailing '.'; 272261877Sume * copy without '.' if present. 272361877Sume */ 272461877Sume n = strlen(name); 272561877Sume if (n >= MAXDNAME) { 2726156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 272761877Sume return (-1); 272861877Sume } 272961877Sume if (n > 0 && name[--n] == '.') { 273061877Sume strncpy(nbuf, name, n); 273161877Sume nbuf[n] = '\0'; 273261877Sume } else 273361877Sume longname = name; 273461877Sume } else { 273561877Sume n = strlen(name); 273661877Sume d = strlen(domain); 273761877Sume if (n + d + 1 >= MAXDNAME) { 2738156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 273961877Sume return (-1); 274061877Sume } 2741105940Sume snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain); 274261877Sume } 2743156960Sume return (res_queryN(longname, target, res)); 274461877Sume} 2745