getaddrinfo.c revision 265946
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: stable/10/lib/libc/net/getaddrinfo.c 265946 2014-05-13 06:05:53Z kevlo $"); 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 ANY 0 106105940Sume#define YES 1 107105940Sume#define NO 0 10855163Sshin 10955163Sshinstatic const char in_addrany[] = { 0, 0, 0, 0 }; 110105940Sumestatic const char in_loopback[] = { 127, 0, 0, 1 }; 111105940Sume#ifdef INET6 11255163Sshinstatic const char in6_addrany[] = { 11355163Sshin 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 11455163Sshin}; 11555163Sshinstatic const char in6_loopback[] = { 11655163Sshin 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 11755163Sshin}; 118105940Sume#endif 11955163Sshin 120121747Sumestruct policyqueue { 121121747Sume TAILQ_ENTRY(policyqueue) pc_entry; 122121747Sume#ifdef INET6 123121747Sume struct in6_addrpolicy pc_policy; 124121747Sume#endif 125121747Sume}; 126121747SumeTAILQ_HEAD(policyhead, policyqueue); 127121747Sume 12855163Sshinstatic const struct afd { 12955163Sshin int a_af; 13055163Sshin int a_addrlen; 131146244Sume socklen_t a_socklen; 13255163Sshin int a_off; 13355163Sshin const char *a_addrany; 13473665Sobrien const char *a_loopback; 13555163Sshin int a_scoped; 13655163Sshin} afdl [] = { 13755163Sshin#ifdef INET6 13855163Sshin#define N_INET6 0 13955163Sshin {PF_INET6, sizeof(struct in6_addr), 14055163Sshin sizeof(struct sockaddr_in6), 14155163Sshin offsetof(struct sockaddr_in6, sin6_addr), 14255163Sshin in6_addrany, in6_loopback, 1}, 14355163Sshin#define N_INET 1 14455163Sshin#else 14555163Sshin#define N_INET 0 14655163Sshin#endif 14755163Sshin {PF_INET, sizeof(struct in_addr), 14855163Sshin sizeof(struct sockaddr_in), 14955163Sshin offsetof(struct sockaddr_in, sin_addr), 15055163Sshin in_addrany, in_loopback, 0}, 15155163Sshin {0, 0, 0, 0, NULL, NULL, 0}, 15255163Sshin}; 15355163Sshin 15455163Sshinstruct explore { 15561877Sume int e_af; 15655163Sshin int e_socktype; 15755163Sshin int e_protocol; 15855163Sshin int e_wild; 159105940Sume#define WILD_AF(ex) ((ex)->e_wild & 0x01) 160105940Sume#define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02) 161105940Sume#define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04) 16255163Sshin}; 16355163Sshin 16455163Sshinstatic const struct explore explore[] = { 16561877Sume#if 0 166238504Sjilles { PF_LOCAL, ANY, ANY, 0x01 }, 16761877Sume#endif 16861877Sume#ifdef INET6 169238504Sjilles { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, 0x07 }, 170238504Sjilles { PF_INET6, SOCK_STREAM, IPPROTO_TCP, 0x07 }, 171238504Sjilles { PF_INET6, SOCK_STREAM, IPPROTO_SCTP, 0x03 }, 172238504Sjilles { PF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP, 0x07 }, 173265946Skevlo { PF_INET6, SOCK_DGRAM, IPPROTO_UDPLITE, 0x03 }, 174238504Sjilles { PF_INET6, SOCK_RAW, ANY, 0x05 }, 17561877Sume#endif 176238504Sjilles { PF_INET, SOCK_DGRAM, IPPROTO_UDP, 0x07 }, 177238504Sjilles { PF_INET, SOCK_STREAM, IPPROTO_TCP, 0x07 }, 178238504Sjilles { PF_INET, SOCK_STREAM, IPPROTO_SCTP, 0x03 }, 179238504Sjilles { PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP, 0x07 }, 180265946Skevlo { PF_INET, SOCK_DGRAM, IPPROTO_UDPLITE, 0x03 }, 181238504Sjilles { PF_INET, SOCK_RAW, ANY, 0x05 }, 182238504Sjilles { -1, 0, 0, 0 }, 18355163Sshin}; 18455163Sshin 18555163Sshin#ifdef INET6 186105940Sume#define PTON_MAX 16 18755163Sshin#else 188105940Sume#define PTON_MAX 4 18955163Sshin#endif 19055163Sshin 191121747Sume#define AIO_SRCFLAG_DEPRECATED 0x1 192121747Sume 193121747Sumestruct ai_order { 194121747Sume union { 195121747Sume struct sockaddr_storage aiou_ss; 196121747Sume struct sockaddr aiou_sa; 197121747Sume } aio_src_un; 198121747Sume#define aio_srcsa aio_src_un.aiou_sa 199121747Sume u_int32_t aio_srcflag; 200121747Sume int aio_srcscope; 201121747Sume int aio_dstscope; 202121747Sume struct policyqueue *aio_srcpolicy; 203121747Sume struct policyqueue *aio_dstpolicy; 204121747Sume struct addrinfo *aio_ai; 205121747Sume int aio_matchlen; 206121747Sume}; 207121747Sume 20865532Snectarstatic const ns_src default_dns_files[] = { 20965532Snectar { NSSRC_FILES, NS_SUCCESS }, 21065532Snectar { NSSRC_DNS, NS_SUCCESS }, 21165532Snectar { 0 } 21265532Snectar}; 21365532Snectar 21461877Sumestruct res_target { 21561877Sume struct res_target *next; 21661877Sume const char *name; /* domain name */ 21762614Sitojun int qclass, qtype; /* class and type of query */ 21861877Sume u_char *answer; /* buffer to put answer */ 21961877Sume int anslen; /* size of answer buffer */ 22061877Sume int n; /* result length */ 22161877Sume}; 22261877Sume 223121426Sume#define MAXPACKET (64*1024) 224121426Sume 225121426Sumetypedef union { 226121426Sume HEADER hdr; 227121426Sume u_char buf[MAXPACKET]; 228121426Sume} querybuf; 229121426Sume 230160593Sumestatic int str2number(const char *, int *); 231190525Sumestatic int explore_copy(const struct addrinfo *, const struct addrinfo *, 232190525Sume struct addrinfo **); 23392941Sobrienstatic int explore_null(const struct addrinfo *, 23492941Sobrien const char *, struct addrinfo **); 23592941Sobrienstatic int explore_numeric(const struct addrinfo *, const char *, 236140906Sume const char *, struct addrinfo **, const char *); 23792941Sobrienstatic int explore_numeric_scope(const struct addrinfo *, const char *, 23892941Sobrien const char *, struct addrinfo **); 23992941Sobrienstatic int get_canonname(const struct addrinfo *, 24092941Sobrien struct addrinfo *, const char *); 24192941Sobrienstatic struct addrinfo *get_ai(const struct addrinfo *, 24292941Sobrien const struct afd *, const char *); 243190525Sumestatic struct addrinfo *copy_ai(const struct addrinfo *); 24492905Sobrienstatic int get_portmatch(const struct addrinfo *, const char *); 24592905Sobrienstatic int get_port(struct addrinfo *, const char *, int); 24692905Sobrienstatic const struct afd *find_afd(int); 247121474Sumestatic int addrconfig(struct addrinfo *); 248129901Sumestatic void set_source(struct ai_order *, struct policyhead *); 249121747Sumestatic int comp_dst(const void *, const void *); 25061877Sume#ifdef INET6 251105943Sumestatic int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *); 25261877Sume#endif 253121747Sumestatic int gai_addr2scopetype(struct sockaddr *); 25455163Sshin 255121426Sumestatic int explore_fqdn(const struct addrinfo *, const char *, 256121426Sume const char *, struct addrinfo **); 257121426Sume 258121747Sumestatic int reorder(struct addrinfo *); 259121747Sumestatic int get_addrselectpolicy(struct policyhead *); 260121747Sumestatic void free_addrselectpolicy(struct policyhead *); 261121747Sumestatic struct policyqueue *match_addrselectpolicy(struct sockaddr *, 262121747Sume struct policyhead *); 263129901Sumestatic int matchlen(struct sockaddr *, struct sockaddr *); 264121747Sume 26592941Sobrienstatic struct addrinfo *getanswer(const querybuf *, int, const char *, int, 266156960Sume const struct addrinfo *, res_state); 267121426Sume#if defined(RESOLVSORT) 268156960Sumestatic int addr4sort(struct addrinfo *, res_state); 269121426Sume#endif 270105943Sumestatic int _dns_getaddrinfo(void *, void *, va_list); 271144634Sumestatic void _sethtent(FILE **); 272144634Sumestatic void _endhtent(FILE **); 273144634Sumestatic struct addrinfo *_gethtent(FILE **, const char *, 274144634Sume const struct addrinfo *); 27592905Sobrienstatic int _files_getaddrinfo(void *, void *, va_list); 27661877Sume#ifdef YP 27792905Sobrienstatic struct addrinfo *_yphostent(char *, const struct addrinfo *); 27892905Sobrienstatic int _yp_getaddrinfo(void *, void *, va_list); 27961877Sume#endif 280158115Sume#ifdef NS_CACHING 281158115Sumestatic int addrinfo_id_func(char *, size_t *, va_list, void *); 282158115Sumestatic int addrinfo_marshal_func(char *, size_t *, void *, va_list, void *); 283158115Sumestatic int addrinfo_unmarshal_func(char *, size_t, void *, va_list, void *); 284158115Sume#endif 28561877Sume 286156960Sumestatic int res_queryN(const char *, struct res_target *, res_state); 287156960Sumestatic int res_searchN(const char *, struct res_target *, res_state); 28892941Sobrienstatic int res_querydomainN(const char *, const char *, 289156960Sume struct res_target *, res_state); 29061877Sume 29155163Sshin/* XXX macros that make external reference is BAD. */ 29255163Sshin 293105940Sume#define GET_AI(ai, afd, addr) \ 29455163Sshindo { \ 29555163Sshin /* external reference: pai, error, and label free */ \ 29655163Sshin (ai) = get_ai(pai, (afd), (addr)); \ 29755163Sshin if ((ai) == NULL) { \ 29855163Sshin error = EAI_MEMORY; \ 29955163Sshin goto free; \ 30055163Sshin } \ 30161877Sume} while (/*CONSTCOND*/0) 30255163Sshin 303105940Sume#define GET_PORT(ai, serv) \ 30455163Sshindo { \ 30555163Sshin /* external reference: error and label free */ \ 30655163Sshin error = get_port((ai), (serv), 0); \ 30755163Sshin if (error != 0) \ 30855163Sshin goto free; \ 30961877Sume} while (/*CONSTCOND*/0) 31055163Sshin 311105940Sume#define GET_CANONNAME(ai, str) \ 31255163Sshindo { \ 31355163Sshin /* external reference: pai, error and label free */ \ 31455163Sshin error = get_canonname(pai, (ai), (str)); \ 31555163Sshin if (error != 0) \ 31655163Sshin goto free; \ 31761877Sume} while (/*CONSTCOND*/0) 31855163Sshin 319105940Sume#define ERR(err) \ 32055163Sshindo { \ 32155163Sshin /* external reference: error, and label bad */ \ 32255163Sshin error = (err); \ 32355163Sshin goto bad; \ 32461877Sume /*NOTREACHED*/ \ 32561877Sume} while (/*CONSTCOND*/0) 32655163Sshin 327105940Sume#define MATCH_FAMILY(x, y, w) \ 32861877Sume ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC))) 329105940Sume#define MATCH(x, y, w) \ 33061877Sume ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY))) 33155163Sshin 33255163Sshinvoid 333157119Sumefreeaddrinfo(struct addrinfo *ai) 33455163Sshin{ 33555163Sshin struct addrinfo *next; 33655163Sshin 33755163Sshin do { 33855163Sshin next = ai->ai_next; 33955163Sshin if (ai->ai_canonname) 34055163Sshin free(ai->ai_canonname); 34155163Sshin /* no need to free(ai->ai_addr) */ 34255163Sshin free(ai); 34361877Sume ai = next; 34461877Sume } while (ai); 34555163Sshin} 34655163Sshin 34755163Sshinstatic int 348160593Sumestr2number(const char *p, int *portp) 34955163Sshin{ 35062836Sitojun char *ep; 351140908Sume unsigned long v; 35262836Sitojun 35362836Sitojun if (*p == '\0') 354140908Sume return -1; 35562836Sitojun ep = NULL; 356105943Sume errno = 0; 357140908Sume v = strtoul(p, &ep, 10); 358160593Sume if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) { 359160593Sume *portp = v; 360160593Sume return 0; 361160593Sume } else 362140908Sume return -1; 36355163Sshin} 36455163Sshin 36555163Sshinint 366157119Sumegetaddrinfo(const char *hostname, const char *servname, 367157119Sume const struct addrinfo *hints, struct addrinfo **res) 36855163Sshin{ 36955163Sshin struct addrinfo sentinel; 37055163Sshin struct addrinfo *cur; 37155163Sshin int error = 0; 372190525Sume struct addrinfo ai, ai0, *afai; 37355163Sshin struct addrinfo *pai; 374190525Sume const struct afd *afd; 37555163Sshin const struct explore *ex; 376190525Sume struct addrinfo *afailist[sizeof(afdl)/sizeof(afdl[0])]; 377190525Sume struct addrinfo *afai_unspec; 378190525Sume int found; 379121747Sume int numeric = 0; 38055163Sshin 381190525Sume /* ensure we return NULL on errors */ 382190525Sume *res = NULL; 383190525Sume 384190525Sume memset(&ai, 0, sizeof(ai)); 385190525Sume 386190525Sume memset(afailist, 0, sizeof(afailist)); 387190525Sume afai_unspec = NULL; 388190525Sume 38961877Sume memset(&sentinel, 0, sizeof(sentinel)); 39055163Sshin cur = &sentinel; 39155163Sshin pai = &ai; 39255163Sshin pai->ai_flags = 0; 39355163Sshin pai->ai_family = PF_UNSPEC; 39455163Sshin pai->ai_socktype = ANY; 39555163Sshin pai->ai_protocol = ANY; 39655163Sshin pai->ai_addrlen = 0; 39755163Sshin pai->ai_canonname = NULL; 39855163Sshin pai->ai_addr = NULL; 39955163Sshin pai->ai_next = NULL; 40055163Sshin 40155163Sshin if (hostname == NULL && servname == NULL) 40255163Sshin return EAI_NONAME; 40355163Sshin if (hints) { 40455163Sshin /* error check for hints */ 40555163Sshin if (hints->ai_addrlen || hints->ai_canonname || 40655163Sshin hints->ai_addr || hints->ai_next) 40755163Sshin ERR(EAI_BADHINTS); /* xxx */ 40855163Sshin if (hints->ai_flags & ~AI_MASK) 40955163Sshin ERR(EAI_BADFLAGS); 41055163Sshin switch (hints->ai_family) { 41155163Sshin case PF_UNSPEC: 41255163Sshin case PF_INET: 41355163Sshin#ifdef INET6 41455163Sshin case PF_INET6: 41555163Sshin#endif 41655163Sshin break; 41755163Sshin default: 41855163Sshin ERR(EAI_FAMILY); 41955163Sshin } 42055163Sshin memcpy(pai, hints, sizeof(*pai)); 42155163Sshin 42255163Sshin /* 42355163Sshin * if both socktype/protocol are specified, check if they 42455163Sshin * are meaningful combination. 42555163Sshin */ 42655163Sshin if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) { 42761877Sume for (ex = explore; ex->e_af >= 0; ex++) { 428190525Sume if (!MATCH_FAMILY(pai->ai_family, ex->e_af, 429190525Sume WILD_AF(ex))) 43061877Sume continue; 431190525Sume if (!MATCH(pai->ai_socktype, ex->e_socktype, 432190525Sume WILD_SOCKTYPE(ex))) 43355163Sshin continue; 434190525Sume if (!MATCH(pai->ai_protocol, ex->e_protocol, 435190525Sume WILD_PROTOCOL(ex))) 43655163Sshin continue; 437190525Sume 438190525Sume /* matched */ 439190525Sume break; 44055163Sshin } 441190416Sume 442190416Sume if (ex->e_af < 0) 443190416Sume ERR(EAI_BADHINTS); 44455163Sshin } 44555163Sshin } 44655163Sshin 44761877Sume /* 44861877Sume * check for special cases. (1) numeric servname is disallowed if 44961877Sume * socktype/protocol are left unspecified. (2) servname is disallowed 45061877Sume * for raw and other inet{,6} sockets. 45155163Sshin */ 45255163Sshin if (MATCH_FAMILY(pai->ai_family, PF_INET, 1) 45361877Sume#ifdef PF_INET6 454121474Sume || MATCH_FAMILY(pai->ai_family, PF_INET6, 1) 45555163Sshin#endif 45655163Sshin ) { 45761877Sume ai0 = *pai; /* backup *pai */ 45855163Sshin 45961877Sume if (pai->ai_family == PF_UNSPEC) { 46061877Sume#ifdef PF_INET6 46155163Sshin pai->ai_family = PF_INET6; 46255163Sshin#else 46355163Sshin pai->ai_family = PF_INET; 46455163Sshin#endif 46561877Sume } 46655163Sshin error = get_portmatch(pai, servname); 46755163Sshin if (error) 468236695Sdim goto bad; 46961877Sume 47061877Sume *pai = ai0; 47155163Sshin } 47255163Sshin 47361877Sume ai0 = *pai; 47461877Sume 475190525Sume /* 476190525Sume * NULL hostname, or numeric hostname. 477190525Sume * If numeric representation of AF1 can be interpreted as FQDN 478190525Sume * representation of AF2, we need to think again about the code below. 479190525Sume */ 480190525Sume found = 0; 481190525Sume for (afd = afdl; afd->a_af; afd++) { 48255163Sshin *pai = ai0; 48355163Sshin 484190525Sume if (!MATCH_FAMILY(pai->ai_family, afd->a_af, 1)) 48555163Sshin continue; 48661877Sume 48755163Sshin if (pai->ai_family == PF_UNSPEC) 488190525Sume pai->ai_family = afd->a_af; 48955163Sshin 490190525Sume if (hostname == NULL) { 491190525Sume error = explore_null(pai, servname, 492190525Sume &afailist[afd - afdl]); 493190525Sume 494190525Sume /* 495190525Sume * Errors from explore_null should be unexpected and 496190525Sume * be caught to avoid returning an incomplete result. 497190525Sume */ 498190525Sume if (error != 0) 499190525Sume goto bad; 500190525Sume } else { 501140906Sume error = explore_numeric_scope(pai, hostname, servname, 502190525Sume &afailist[afd - afdl]); 50355163Sshin 504190525Sume /* 505190525Sume * explore_numeric_scope returns an error for address 506190525Sume * families that do not match that of hostname. 507190525Sume * Thus we should not catch the error at this moment. 508190525Sume */ 509190525Sume } 510121474Sume 511190525Sume if (!error && afailist[afd - afdl]) 512190525Sume found++; 51355163Sshin } 514190525Sume if (found) { 515121747Sume numeric = 1; 516190525Sume goto globcopy; 517121747Sume } 518121474Sume 519121425Sume if (hostname == NULL) 520121425Sume ERR(EAI_NONAME); /* used to be EAI_NODATA */ 52155163Sshin if (pai->ai_flags & AI_NUMERICHOST) 52290053Sroam ERR(EAI_NONAME); 52355163Sshin 524121474Sume if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0)) 525121474Sume ERR(EAI_FAIL); 526121474Sume 52761877Sume /* 52861877Sume * hostname as alphabetical name. 52961877Sume */ 530190525Sume *pai = ai0; 531190525Sume error = explore_fqdn(pai, hostname, servname, &afai_unspec); 532190525Sume 533190525Sumeglobcopy: 53461877Sume for (ex = explore; ex->e_af >= 0; ex++) { 53561877Sume *pai = ai0; 53655163Sshin 537190525Sume if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex))) 53861877Sume continue; 539121474Sume if (!MATCH(pai->ai_socktype, ex->e_socktype, 540190525Sume WILD_SOCKTYPE(ex))) 54161877Sume continue; 542121474Sume if (!MATCH(pai->ai_protocol, ex->e_protocol, 543190525Sume WILD_PROTOCOL(ex))) 54461877Sume continue; 54555163Sshin 546190525Sume if (pai->ai_family == PF_UNSPEC) 547190525Sume pai->ai_family = ex->e_af; 54861877Sume if (pai->ai_socktype == ANY && ex->e_socktype != ANY) 54961877Sume pai->ai_socktype = ex->e_socktype; 55061877Sume if (pai->ai_protocol == ANY && ex->e_protocol != ANY) 55161877Sume pai->ai_protocol = ex->e_protocol; 55261877Sume 553190525Sume /* 554190525Sume * if the servname does not match socktype/protocol, ignore it. 555190525Sume */ 556190525Sume if (get_portmatch(pai, servname) != 0) 557190525Sume continue; 55861877Sume 559190525Sume if (afai_unspec) 560190525Sume afai = afai_unspec; 561190525Sume else { 562190525Sume if ((afd = find_afd(pai->ai_family)) == NULL) 563190525Sume continue; 564190525Sume /* XXX assumes that afd points inside afdl[] */ 565190525Sume afai = afailist[afd - afdl]; 566190525Sume } 567190525Sume if (!afai) 568190525Sume continue; 569190525Sume 570190525Sume error = explore_copy(pai, afai, &cur->ai_next); 571190525Sume if (error != 0) 572190525Sume goto bad; 573190525Sume 57461877Sume while (cur && cur->ai_next) 57561877Sume cur = cur->ai_next; 57655163Sshin } 57755163Sshin 578121747Sume /* 579121747Sume * ensure we return either: 580121747Sume * - error == 0, non-NULL *res 581121747Sume * - error != 0, NULL *res 582121747Sume */ 58361877Sume if (error == 0) { 58461877Sume if (sentinel.ai_next) { 585121747Sume /* 586121747Sume * If the returned entry is for an active connection, 587121747Sume * and the given name is not numeric, reorder the 588121747Sume * list, so that the application would try the list 589172052Sjinmei * in the most efficient order. Since the head entry 590172052Sjinmei * of the original list may contain ai_canonname and 591172052Sjinmei * that entry may be moved elsewhere in the new list, 592172052Sjinmei * we keep the pointer and will restore it in the new 593172052Sjinmei * head entry. (Note that RFC3493 requires the head 594172052Sjinmei * entry store it when requested by the caller). 595121747Sume */ 596121747Sume if (hints == NULL || !(hints->ai_flags & AI_PASSIVE)) { 597172052Sjinmei if (!numeric) { 598172052Sjinmei char *canonname; 599172052Sjinmei 600172052Sjinmei canonname = 601172052Sjinmei sentinel.ai_next->ai_canonname; 602172052Sjinmei sentinel.ai_next->ai_canonname = NULL; 603121747Sume (void)reorder(&sentinel); 604172052Sjinmei if (sentinel.ai_next->ai_canonname == 605172052Sjinmei NULL) { 606172052Sjinmei sentinel.ai_next->ai_canonname 607172052Sjinmei = canonname; 608172052Sjinmei } else if (canonname != NULL) 609172052Sjinmei free(canonname); 610172052Sjinmei } 611121747Sume } 61261877Sume *res = sentinel.ai_next; 61361877Sume } else 61461877Sume error = EAI_FAIL; 61555163Sshin } 616190525Sume 617121747Sumebad: 618190525Sume if (afai_unspec) 619190525Sume freeaddrinfo(afai_unspec); 620190525Sume for (afd = afdl; afd->a_af; afd++) { 621190525Sume if (afailist[afd - afdl]) 622190525Sume freeaddrinfo(afailist[afd - afdl]); 623190525Sume } 624190525Sume if (!*res) 625190525Sume if (sentinel.ai_next) 626190525Sume freeaddrinfo(sentinel.ai_next); 627190525Sume 628190525Sume return (error); 62955163Sshin} 63055163Sshin 631121747Sumestatic int 632157119Sumereorder(struct addrinfo *sentinel) 633121747Sume{ 634121747Sume struct addrinfo *ai, **aip; 635121747Sume struct ai_order *aio; 636121747Sume int i, n; 637121747Sume struct policyhead policyhead; 638121747Sume 639121747Sume /* count the number of addrinfo elements for sorting. */ 640121747Sume for (n = 0, ai = sentinel->ai_next; ai != NULL; ai = ai->ai_next, n++) 641121747Sume ; 642121747Sume 643121747Sume /* 644121747Sume * If the number is small enough, we can skip the reordering process. 645121747Sume */ 646121747Sume if (n <= 1) 647121747Sume return(n); 648121747Sume 649121747Sume /* allocate a temporary array for sort and initialization of it. */ 650121747Sume if ((aio = malloc(sizeof(*aio) * n)) == NULL) 651121747Sume return(n); /* give up reordering */ 652121747Sume memset(aio, 0, sizeof(*aio) * n); 653121747Sume 654121747Sume /* retrieve address selection policy from the kernel */ 655121747Sume TAILQ_INIT(&policyhead); 656121747Sume if (!get_addrselectpolicy(&policyhead)) { 657121747Sume /* no policy is installed into kernel, we don't sort. */ 658121747Sume free(aio); 659121747Sume return (n); 660121747Sume } 661121747Sume 662121747Sume for (i = 0, ai = sentinel->ai_next; i < n; ai = ai->ai_next, i++) { 663121747Sume aio[i].aio_ai = ai; 664121747Sume aio[i].aio_dstscope = gai_addr2scopetype(ai->ai_addr); 665121747Sume aio[i].aio_dstpolicy = match_addrselectpolicy(ai->ai_addr, 666121747Sume &policyhead); 667129901Sume set_source(&aio[i], &policyhead); 668121747Sume } 669121747Sume 670121747Sume /* perform sorting. */ 671121747Sume qsort(aio, n, sizeof(*aio), comp_dst); 672121747Sume 673121747Sume /* reorder the addrinfo chain. */ 674121747Sume for (i = 0, aip = &sentinel->ai_next; i < n; i++) { 675121747Sume *aip = aio[i].aio_ai; 676121747Sume aip = &aio[i].aio_ai->ai_next; 677121747Sume } 678121747Sume *aip = NULL; 679121747Sume 680121747Sume /* cleanup and return */ 681121747Sume free(aio); 682121747Sume free_addrselectpolicy(&policyhead); 683121747Sume return(n); 684121747Sume} 685121747Sume 686121747Sumestatic int 687157119Sumeget_addrselectpolicy(struct policyhead *head) 688121747Sume{ 689121747Sume#ifdef INET6 690121747Sume int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY }; 691121747Sume size_t l; 692121747Sume char *buf; 693121747Sume struct in6_addrpolicy *pol, *ep; 694121747Sume 695121747Sume if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), NULL, &l, NULL, 0) < 0) 696121747Sume return (0); 697238599Semax if (l == 0) 698238599Semax return (0); 699121747Sume if ((buf = malloc(l)) == NULL) 700121747Sume return (0); 701121747Sume if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf, &l, NULL, 0) < 0) { 702121747Sume free(buf); 703121747Sume return (0); 704121747Sume } 705121747Sume 706121747Sume ep = (struct in6_addrpolicy *)(buf + l); 707121747Sume for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) { 708121747Sume struct policyqueue *new; 709121747Sume 710121747Sume if ((new = malloc(sizeof(*new))) == NULL) { 711121747Sume free_addrselectpolicy(head); /* make the list empty */ 712121747Sume break; 713121747Sume } 714121747Sume new->pc_policy = *pol; 715121747Sume TAILQ_INSERT_TAIL(head, new, pc_entry); 716121747Sume } 717121747Sume 718121747Sume free(buf); 719121747Sume return (1); 720121747Sume#else 721121747Sume return (0); 722121747Sume#endif 723121747Sume} 724121747Sume 725121747Sumestatic void 726157119Sumefree_addrselectpolicy(struct policyhead *head) 727121747Sume{ 728121747Sume struct policyqueue *ent, *nent; 729121747Sume 730121747Sume for (ent = TAILQ_FIRST(head); ent; ent = nent) { 731121747Sume nent = TAILQ_NEXT(ent, pc_entry); 732121747Sume TAILQ_REMOVE(head, ent, pc_entry); 733121747Sume free(ent); 734121747Sume } 735121747Sume} 736121747Sume 737121747Sumestatic struct policyqueue * 738157119Sumematch_addrselectpolicy(struct sockaddr *addr, struct policyhead *head) 739121747Sume{ 740121747Sume#ifdef INET6 741121747Sume struct policyqueue *ent, *bestent = NULL; 742121747Sume struct in6_addrpolicy *pol; 743121747Sume int matchlen, bestmatchlen = -1; 744121747Sume u_char *mp, *ep, *k, *p, m; 745121747Sume struct sockaddr_in6 key; 746121747Sume 747121747Sume switch(addr->sa_family) { 748121747Sume case AF_INET6: 749121747Sume key = *(struct sockaddr_in6 *)addr; 750121747Sume break; 751121747Sume case AF_INET: 752121747Sume /* convert the address into IPv4-mapped IPv6 address. */ 753121747Sume memset(&key, 0, sizeof(key)); 754121747Sume key.sin6_family = AF_INET6; 755121747Sume key.sin6_len = sizeof(key); 756121747Sume key.sin6_addr.s6_addr[10] = 0xff; 757121747Sume key.sin6_addr.s6_addr[11] = 0xff; 758121747Sume memcpy(&key.sin6_addr.s6_addr[12], 759121747Sume &((struct sockaddr_in *)addr)->sin_addr, 4); 760121747Sume break; 761121747Sume default: 762121747Sume return(NULL); 763121747Sume } 764121747Sume 765121747Sume for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) { 766121747Sume pol = &ent->pc_policy; 767121747Sume matchlen = 0; 768121747Sume 769121747Sume mp = (u_char *)&pol->addrmask.sin6_addr; 770121747Sume ep = mp + 16; /* XXX: scope field? */ 771121747Sume k = (u_char *)&key.sin6_addr; 772121747Sume p = (u_char *)&pol->addr.sin6_addr; 773121747Sume for (; mp < ep && *mp; mp++, k++, p++) { 774121747Sume m = *mp; 775121747Sume if ((*k & m) != *p) 776121747Sume goto next; /* not match */ 777121747Sume if (m == 0xff) /* short cut for a typical case */ 778121747Sume matchlen += 8; 779121747Sume else { 780121747Sume while (m >= 0x80) { 781121747Sume matchlen++; 782121747Sume m <<= 1; 783121747Sume } 784121747Sume } 785121747Sume } 786121747Sume 787121747Sume /* matched. check if this is better than the current best. */ 788121747Sume if (matchlen > bestmatchlen) { 789121747Sume bestent = ent; 790121747Sume bestmatchlen = matchlen; 791121747Sume } 792121747Sume 793121747Sume next: 794121747Sume continue; 795121747Sume } 796121747Sume 797121747Sume return(bestent); 798121747Sume#else 799121747Sume return(NULL); 800121747Sume#endif 801121747Sume 802121747Sume} 803121747Sume 804129901Sumestatic void 805157119Sumeset_source(struct ai_order *aio, struct policyhead *ph) 806129901Sume{ 807129901Sume struct addrinfo ai = *aio->aio_ai; 808129901Sume struct sockaddr_storage ss; 809145786Sume socklen_t srclen; 810145786Sume int s; 811129901Sume 812129901Sume /* set unspec ("no source is available"), just in case */ 813129901Sume aio->aio_srcsa.sa_family = AF_UNSPEC; 814129901Sume aio->aio_srcscope = -1; 815129901Sume 816129901Sume switch(ai.ai_family) { 817129901Sume case AF_INET: 818129901Sume#ifdef INET6 819129901Sume case AF_INET6: 820129901Sume#endif 821129901Sume break; 822129901Sume default: /* ignore unsupported AFs explicitly */ 823129901Sume return; 824129901Sume } 825129901Sume 826129901Sume /* XXX: make a dummy addrinfo to call connect() */ 827129901Sume ai.ai_socktype = SOCK_DGRAM; 828129901Sume ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */ 829129901Sume ai.ai_next = NULL; 830129901Sume memset(&ss, 0, sizeof(ss)); 831129901Sume memcpy(&ss, ai.ai_addr, ai.ai_addrlen); 832129901Sume ai.ai_addr = (struct sockaddr *)&ss; 833129901Sume get_port(&ai, "1", 0); 834129901Sume 835129901Sume /* open a socket to get the source address for the given dst */ 836255328Sjilles if ((s = _socket(ai.ai_family, ai.ai_socktype | SOCK_CLOEXEC, 837255328Sjilles ai.ai_protocol)) < 0) 838129901Sume return; /* give up */ 839129901Sume if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0) 840129901Sume goto cleanup; 841129901Sume srclen = ai.ai_addrlen; 842129901Sume if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) { 843129901Sume aio->aio_srcsa.sa_family = AF_UNSPEC; 844129901Sume goto cleanup; 845129901Sume } 846129901Sume aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa); 847129901Sume aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph); 848129901Sume aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr); 849129901Sume#ifdef INET6 850129901Sume if (ai.ai_family == AF_INET6) { 851129901Sume struct in6_ifreq ifr6; 852129901Sume u_int32_t flags6; 853129901Sume 854129901Sume memset(&ifr6, 0, sizeof(ifr6)); 855129901Sume memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen); 856129901Sume if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) { 857129901Sume flags6 = ifr6.ifr_ifru.ifru_flags6; 858129901Sume if ((flags6 & IN6_IFF_DEPRECATED)) 859129901Sume aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED; 860129901Sume } 861129901Sume } 862129901Sume#endif 863129901Sume 864129901Sume cleanup: 865129901Sume _close(s); 866129901Sume return; 867129901Sume} 868129901Sume 869121747Sumestatic int 870157119Sumematchlen(struct sockaddr *src, struct sockaddr *dst) 871129901Sume{ 872129901Sume int match = 0; 873129901Sume u_char *s, *d; 874129901Sume u_char *lim, r; 875129901Sume int addrlen; 876129901Sume 877129901Sume switch (src->sa_family) { 878129901Sume#ifdef INET6 879129901Sume case AF_INET6: 880129901Sume s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr; 881129901Sume d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr; 882129901Sume addrlen = sizeof(struct in6_addr); 883129901Sume lim = s + addrlen; 884129901Sume break; 885129901Sume#endif 886129901Sume case AF_INET: 887146222Sgnn s = (u_char *)&((struct sockaddr_in *)src)->sin_addr; 888146222Sgnn d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr; 889129901Sume addrlen = sizeof(struct in_addr); 890129901Sume lim = s + addrlen; 891129901Sume break; 892129901Sume default: 893129901Sume return(0); 894129901Sume } 895129901Sume 896129901Sume while (s < lim) 897129901Sume if ((r = (*d++ ^ *s++)) != 0) { 898129901Sume while (r < addrlen * 8) { 899129901Sume match++; 900129901Sume r <<= 1; 901129901Sume } 902129901Sume break; 903129901Sume } else 904129901Sume match += 8; 905129901Sume return(match); 906129901Sume} 907129901Sume 908129901Sumestatic int 909157119Sumecomp_dst(const void *arg1, const void *arg2) 910121747Sume{ 911121747Sume const struct ai_order *dst1 = arg1, *dst2 = arg2; 912121747Sume 913121747Sume /* 914121747Sume * Rule 1: Avoid unusable destinations. 915121747Sume * XXX: we currently do not consider if an appropriate route exists. 916121747Sume */ 917121747Sume if (dst1->aio_srcsa.sa_family != AF_UNSPEC && 918121747Sume dst2->aio_srcsa.sa_family == AF_UNSPEC) { 919121747Sume return(-1); 920121747Sume } 921121747Sume if (dst1->aio_srcsa.sa_family == AF_UNSPEC && 922121747Sume dst2->aio_srcsa.sa_family != AF_UNSPEC) { 923121747Sume return(1); 924121747Sume } 925121747Sume 926121747Sume /* Rule 2: Prefer matching scope. */ 927121747Sume if (dst1->aio_dstscope == dst1->aio_srcscope && 928121747Sume dst2->aio_dstscope != dst2->aio_srcscope) { 929121747Sume return(-1); 930121747Sume } 931121747Sume if (dst1->aio_dstscope != dst1->aio_srcscope && 932121747Sume dst2->aio_dstscope == dst2->aio_srcscope) { 933121747Sume return(1); 934121747Sume } 935121747Sume 936121747Sume /* Rule 3: Avoid deprecated addresses. */ 937121747Sume if (dst1->aio_srcsa.sa_family != AF_UNSPEC && 938121747Sume dst2->aio_srcsa.sa_family != AF_UNSPEC) { 939121747Sume if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) && 940121747Sume (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) { 941121747Sume return(-1); 942121747Sume } 943121747Sume if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) && 944121747Sume !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) { 945121747Sume return(1); 946121747Sume } 947121747Sume } 948121747Sume 949121747Sume /* Rule 4: Prefer home addresses. */ 950121747Sume /* XXX: not implemented yet */ 951121747Sume 952121747Sume /* Rule 5: Prefer matching label. */ 953121747Sume#ifdef INET6 954121747Sume if (dst1->aio_srcpolicy && dst1->aio_dstpolicy && 955121747Sume dst1->aio_srcpolicy->pc_policy.label == 956121747Sume dst1->aio_dstpolicy->pc_policy.label && 957121747Sume (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL || 958121747Sume dst2->aio_srcpolicy->pc_policy.label != 959121747Sume dst2->aio_dstpolicy->pc_policy.label)) { 960121747Sume return(-1); 961121747Sume } 962121747Sume if (dst2->aio_srcpolicy && dst2->aio_dstpolicy && 963121747Sume dst2->aio_srcpolicy->pc_policy.label == 964121747Sume dst2->aio_dstpolicy->pc_policy.label && 965121747Sume (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL || 966121747Sume dst1->aio_srcpolicy->pc_policy.label != 967121747Sume dst1->aio_dstpolicy->pc_policy.label)) { 968121747Sume return(1); 969121747Sume } 970121747Sume#endif 971121747Sume 972121747Sume /* Rule 6: Prefer higher precedence. */ 973121747Sume#ifdef INET6 974121747Sume if (dst1->aio_dstpolicy && 975121747Sume (dst2->aio_dstpolicy == NULL || 976121747Sume dst1->aio_dstpolicy->pc_policy.preced > 977121747Sume dst2->aio_dstpolicy->pc_policy.preced)) { 978121747Sume return(-1); 979121747Sume } 980121747Sume if (dst2->aio_dstpolicy && 981121747Sume (dst1->aio_dstpolicy == NULL || 982121747Sume dst2->aio_dstpolicy->pc_policy.preced > 983121747Sume dst1->aio_dstpolicy->pc_policy.preced)) { 984121747Sume return(1); 985121747Sume } 986121747Sume#endif 987121747Sume 988121747Sume /* Rule 7: Prefer native transport. */ 989121747Sume /* XXX: not implemented yet */ 990121747Sume 991121747Sume /* Rule 8: Prefer smaller scope. */ 992121747Sume if (dst1->aio_dstscope >= 0 && 993121747Sume dst1->aio_dstscope < dst2->aio_dstscope) { 994121747Sume return(-1); 995121747Sume } 996121747Sume if (dst2->aio_dstscope >= 0 && 997121747Sume dst2->aio_dstscope < dst1->aio_dstscope) { 998121747Sume return(1); 999121747Sume } 1000121747Sume 1001121747Sume /* 1002121747Sume * Rule 9: Use longest matching prefix. 1003121747Sume * We compare the match length in a same AF only. 1004121747Sume */ 1005121747Sume if (dst1->aio_ai->ai_addr->sa_family == 1006121747Sume dst2->aio_ai->ai_addr->sa_family) { 1007121747Sume if (dst1->aio_matchlen > dst2->aio_matchlen) { 1008121747Sume return(-1); 1009121747Sume } 1010121747Sume if (dst1->aio_matchlen < dst2->aio_matchlen) { 1011121747Sume return(1); 1012121747Sume } 1013121747Sume } 1014121747Sume 1015121747Sume /* Rule 10: Otherwise, leave the order unchanged. */ 1016121747Sume return(-1); 1017121747Sume} 1018121747Sume 101955163Sshin/* 1020121747Sume * Copy from scope.c. 1021121747Sume * XXX: we should standardize the functions and link them as standard 1022121747Sume * library. 1023121747Sume */ 1024121747Sumestatic int 1025157119Sumegai_addr2scopetype(struct sockaddr *sa) 1026121747Sume{ 1027121747Sume#ifdef INET6 1028121747Sume struct sockaddr_in6 *sa6; 1029121747Sume#endif 1030121747Sume struct sockaddr_in *sa4; 1031121747Sume 1032121747Sume switch(sa->sa_family) { 1033121747Sume#ifdef INET6 1034121747Sume case AF_INET6: 1035121747Sume sa6 = (struct sockaddr_in6 *)sa; 1036121747Sume if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 1037121747Sume /* just use the scope field of the multicast address */ 1038121747Sume return(sa6->sin6_addr.s6_addr[2] & 0x0f); 1039121747Sume } 1040121747Sume /* 1041121747Sume * Unicast addresses: map scope type to corresponding scope 1042121747Sume * value defined for multcast addresses. 1043121747Sume * XXX: hardcoded scope type values are bad... 1044121747Sume */ 1045121747Sume if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr)) 1046121747Sume return(1); /* node local scope */ 1047121747Sume if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) 1048121747Sume return(2); /* link-local scope */ 1049121747Sume if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr)) 1050121747Sume return(5); /* site-local scope */ 1051121747Sume return(14); /* global scope */ 1052121747Sume break; 1053121747Sume#endif 1054121747Sume case AF_INET: 1055121747Sume /* 1056121747Sume * IPv4 pseudo scoping according to RFC 3484. 1057121747Sume */ 1058121747Sume sa4 = (struct sockaddr_in *)sa; 1059121747Sume /* IPv4 autoconfiguration addresses have link-local scope. */ 1060121747Sume if (((u_char *)&sa4->sin_addr)[0] == 169 && 1061121747Sume ((u_char *)&sa4->sin_addr)[1] == 254) 1062121747Sume return(2); 1063121747Sume /* Private addresses have site-local scope. */ 1064121747Sume if (((u_char *)&sa4->sin_addr)[0] == 10 || 1065121747Sume (((u_char *)&sa4->sin_addr)[0] == 172 && 1066121747Sume (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) || 1067121747Sume (((u_char *)&sa4->sin_addr)[0] == 192 && 1068121747Sume ((u_char *)&sa4->sin_addr)[1] == 168)) 1069129905Sume return(14); /* XXX: It should be 5 unless NAT */ 1070121747Sume /* Loopback addresses have link-local scope. */ 1071121747Sume if (((u_char *)&sa4->sin_addr)[0] == 127) 1072121747Sume return(2); 1073121747Sume return(14); 1074121747Sume break; 1075121747Sume default: 1076121747Sume errno = EAFNOSUPPORT; /* is this a good error? */ 1077121747Sume return(-1); 1078121747Sume } 1079121747Sume} 1080121747Sume 1081190525Sumestatic int 1082190525Sumeexplore_copy(const struct addrinfo *pai, const struct addrinfo *src0, 1083190525Sume struct addrinfo **res) 1084190525Sume{ 1085190525Sume int error; 1086190525Sume struct addrinfo sentinel, *cur; 1087190525Sume const struct addrinfo *src; 1088190525Sume 1089190525Sume error = 0; 1090190525Sume sentinel.ai_next = NULL; 1091190525Sume cur = &sentinel; 1092190525Sume 1093190525Sume for (src = src0; src != NULL; src = src->ai_next) { 1094190525Sume if (src->ai_family != pai->ai_family) 1095190525Sume continue; 1096190525Sume 1097190525Sume cur->ai_next = copy_ai(src); 1098190525Sume if (!cur->ai_next) { 1099190525Sume error = EAI_MEMORY; 1100190525Sume goto fail; 1101190525Sume } 1102190525Sume 1103190525Sume cur->ai_next->ai_socktype = pai->ai_socktype; 1104190525Sume cur->ai_next->ai_protocol = pai->ai_protocol; 1105190525Sume cur = cur->ai_next; 1106190525Sume } 1107190525Sume 1108190525Sume *res = sentinel.ai_next; 1109190525Sume return 0; 1110190525Sume 1111190525Sumefail: 1112190525Sume freeaddrinfo(sentinel.ai_next); 1113190525Sume return error; 1114190525Sume} 1115190525Sume 1116121747Sume/* 111755163Sshin * hostname == NULL. 111855163Sshin * passive socket -> anyaddr (0.0.0.0 or ::) 111955163Sshin * non-passive socket -> localhost (127.0.0.1 or ::1) 112055163Sshin */ 112155163Sshinstatic int 1122157119Sumeexplore_null(const struct addrinfo *pai, const char *servname, 1123157119Sume struct addrinfo **res) 112455163Sshin{ 1125121474Sume int s; 112655163Sshin const struct afd *afd; 1127160551Sume struct addrinfo *ai; 112855163Sshin int error; 112955163Sshin 113055163Sshin *res = NULL; 1131160551Sume ai = NULL; 113255163Sshin 113355163Sshin /* 1134121474Sume * filter out AFs that are not supported by the kernel 1135121474Sume * XXX errno? 1136121474Sume */ 1137255328Sjilles s = _socket(pai->ai_family, SOCK_DGRAM | SOCK_CLOEXEC, 0); 1138121474Sume if (s < 0) { 1139121474Sume if (errno != EMFILE) 1140121474Sume return 0; 1141121474Sume } else 1142121474Sume _close(s); 1143121474Sume 114455163Sshin afd = find_afd(pai->ai_family); 114555163Sshin if (afd == NULL) 114655163Sshin return 0; 114755163Sshin 114861877Sume if (pai->ai_flags & AI_PASSIVE) { 1149160551Sume GET_AI(ai, afd, afd->a_addrany); 1150160551Sume GET_PORT(ai, servname); 115161877Sume } else { 1152160551Sume GET_AI(ai, afd, afd->a_loopback); 1153160551Sume GET_PORT(ai, servname); 115461877Sume } 115555163Sshin 1156160551Sume *res = ai; 115755163Sshin return 0; 115855163Sshin 115955163Sshinfree: 1160160551Sume if (ai != NULL) 1161160551Sume freeaddrinfo(ai); 116255163Sshin return error; 116355163Sshin} 116455163Sshin 116555163Sshin/* 116655163Sshin * numeric hostname 116755163Sshin */ 116855163Sshinstatic int 1169157119Sumeexplore_numeric(const struct addrinfo *pai, const char *hostname, 1170157119Sume const char *servname, struct addrinfo **res, const char *canonname) 117155163Sshin{ 117255163Sshin const struct afd *afd; 1173160551Sume struct addrinfo *ai; 117455163Sshin int error; 117555163Sshin char pton[PTON_MAX]; 117655163Sshin 117755163Sshin *res = NULL; 1178160551Sume ai = NULL; 117955163Sshin 118055163Sshin afd = find_afd(pai->ai_family); 118155163Sshin if (afd == NULL) 118255163Sshin return 0; 118355163Sshin 118462614Sitojun switch (afd->a_af) { 118562614Sitojun case AF_INET: 1186160552Sume /* 1187160552Sume * RFC3493 requires getaddrinfo() to accept AF_INET formats 1188160552Sume * that are accepted by inet_addr() and its family. The 1189160552Sume * accepted forms includes the "classful" one, which inet_pton 1190160552Sume * does not accept. So we need to separate the case for 1191160552Sume * AF_INET. 1192160552Sume */ 1193160553Sume if (inet_aton(hostname, (struct in_addr *)pton) != 1) 1194160553Sume return 0; 119562614Sitojun break; 119662614Sitojun default: 1197160553Sume if (inet_pton(afd->a_af, hostname, pton) != 1) 1198160553Sume return 0; 119962614Sitojun break; 120055163Sshin } 120155163Sshin 1202160553Sume if (pai->ai_family == afd->a_af) { 1203160553Sume GET_AI(ai, afd, pton); 1204160553Sume GET_PORT(ai, servname); 1205160553Sume if ((pai->ai_flags & AI_CANONNAME)) { 1206160553Sume /* 1207160553Sume * Set the numeric address itself as the canonical 1208160553Sume * name, based on a clarification in RFC3493. 1209160553Sume */ 1210160553Sume GET_CANONNAME(ai, canonname); 1211160553Sume } 1212160553Sume } else { 1213160553Sume /* 1214160553Sume * XXX: This should not happen since we already matched the AF 1215160553Sume * by find_afd. 1216160553Sume */ 1217160553Sume ERR(EAI_FAMILY); 1218160553Sume } 1219160553Sume 1220160551Sume *res = ai; 122155163Sshin return 0; 122255163Sshin 122355163Sshinfree: 122455163Sshinbad: 1225160551Sume if (ai != NULL) 1226160551Sume freeaddrinfo(ai); 122755163Sshin return error; 122855163Sshin} 122955163Sshin 123055163Sshin/* 123155163Sshin * numeric hostname with scope 123255163Sshin */ 123355163Sshinstatic int 1234157119Sumeexplore_numeric_scope(const struct addrinfo *pai, const char *hostname, 1235157119Sume const char *servname, struct addrinfo **res) 123655163Sshin{ 123761877Sume#if !defined(SCOPE_DELIMITER) || !defined(INET6) 1238140906Sume return explore_numeric(pai, hostname, servname, res, hostname); 123955163Sshin#else 124055163Sshin const struct afd *afd; 124155163Sshin struct addrinfo *cur; 124255163Sshin int error; 124361877Sume char *cp, *hostname2 = NULL, *scope, *addr; 124455163Sshin struct sockaddr_in6 *sin6; 124555163Sshin 124655163Sshin afd = find_afd(pai->ai_family); 124755163Sshin if (afd == NULL) 124855163Sshin return 0; 124965532Snectar 125055163Sshin if (!afd->a_scoped) 1251140906Sume return explore_numeric(pai, hostname, servname, res, hostname); 125255163Sshin 125355163Sshin cp = strchr(hostname, SCOPE_DELIMITER); 125455163Sshin if (cp == NULL) 1255140906Sume return explore_numeric(pai, hostname, servname, res, hostname); 125655163Sshin 125755163Sshin /* 125855163Sshin * Handle special case of <scoped_address><delimiter><scope id> 125955163Sshin */ 126055163Sshin hostname2 = strdup(hostname); 126155163Sshin if (hostname2 == NULL) 126255163Sshin return EAI_MEMORY; 126355163Sshin /* terminate at the delimiter */ 126455163Sshin hostname2[cp - hostname] = '\0'; 126561877Sume addr = hostname2; 126661877Sume scope = cp + 1; 126755163Sshin 1268140906Sume error = explore_numeric(pai, addr, servname, res, hostname); 126961877Sume if (error == 0) { 1270105943Sume u_int32_t scopeid; 127155163Sshin 127255163Sshin for (cur = *res; cur; cur = cur->ai_next) { 127355163Sshin if (cur->ai_family != AF_INET6) 127455163Sshin continue; 127561877Sume sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr; 1276105943Sume if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) { 127761877Sume free(hostname2); 1278190525Sume freeaddrinfo(*res); 1279190525Sume *res = NULL; 1280121425Sume return(EAI_NONAME); /* XXX: is return OK? */ 128161877Sume } 128261877Sume sin6->sin6_scope_id = scopeid; 128355163Sshin } 128455163Sshin } 128555163Sshin 128655163Sshin free(hostname2); 128755163Sshin 1288190525Sume if (error && *res) { 1289190525Sume freeaddrinfo(*res); 1290190525Sume *res = NULL; 1291190525Sume } 129255163Sshin return error; 129355163Sshin#endif 129455163Sshin} 129555163Sshin 129655163Sshinstatic int 1297157119Sumeget_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str) 129855163Sshin{ 129955163Sshin if ((pai->ai_flags & AI_CANONNAME) != 0) { 1300140947Sume ai->ai_canonname = strdup(str); 130155163Sshin if (ai->ai_canonname == NULL) 130255163Sshin return EAI_MEMORY; 130355163Sshin } 130455163Sshin return 0; 130555163Sshin} 130655163Sshin 130755163Sshinstatic struct addrinfo * 1308157119Sumeget_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr) 130955163Sshin{ 131055163Sshin char *p; 131155163Sshin struct addrinfo *ai; 131255163Sshin#ifdef FAITH 131355163Sshin struct in6_addr faith_prefix; 131455163Sshin char *fp_str; 131555163Sshin int translate = 0; 131655163Sshin#endif 131755163Sshin 131855163Sshin#ifdef FAITH 131955163Sshin /* 132055163Sshin * Transfrom an IPv4 addr into a special IPv6 addr format for 132155163Sshin * IPv6->IPv4 translation gateway. (only TCP is supported now) 132255163Sshin * 132355163Sshin * +-----------------------------------+------------+ 132455163Sshin * | faith prefix part (12 bytes) | embedded | 132555163Sshin * | | IPv4 addr part (4 bytes) 132655163Sshin * +-----------------------------------+------------+ 132755163Sshin * 132855163Sshin * faith prefix part is specified as ascii IPv6 addr format 132955163Sshin * in environmental variable GAI. 133055163Sshin * For FAITH to work correctly, routing to faith prefix must be 133155163Sshin * setup toward a machine where a FAITH daemon operates. 133255163Sshin * Also, the machine must enable some mechanizm 133355163Sshin * (e.g. faith interface hack) to divert those packet with 133455163Sshin * faith prefixed destination addr to user-land FAITH daemon. 133555163Sshin */ 133655163Sshin fp_str = getenv("GAI"); 133755163Sshin if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 && 133855163Sshin afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) { 133955163Sshin u_int32_t v4a; 134055163Sshin u_int8_t v4a_top; 134155163Sshin 134255163Sshin memcpy(&v4a, addr, sizeof v4a); 134355163Sshin v4a_top = v4a >> IN_CLASSA_NSHIFT; 134455163Sshin if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) && 134555163Sshin v4a_top != 0 && v4a != IN_LOOPBACKNET) { 134655163Sshin afd = &afdl[N_INET6]; 134755163Sshin memcpy(&faith_prefix.s6_addr[12], addr, 134855163Sshin sizeof(struct in_addr)); 134955163Sshin translate = 1; 135055163Sshin } 135155163Sshin } 135255163Sshin#endif 135355163Sshin 135455163Sshin ai = (struct addrinfo *)malloc(sizeof(struct addrinfo) 135555163Sshin + (afd->a_socklen)); 135655163Sshin if (ai == NULL) 135755163Sshin return NULL; 135855163Sshin 135955163Sshin memcpy(ai, pai, sizeof(struct addrinfo)); 136061877Sume ai->ai_addr = (struct sockaddr *)(void *)(ai + 1); 136161877Sume memset(ai->ai_addr, 0, (size_t)afd->a_socklen); 136255163Sshin ai->ai_addr->sa_len = afd->a_socklen; 136355163Sshin ai->ai_addrlen = afd->a_socklen; 136455163Sshin ai->ai_addr->sa_family = ai->ai_family = afd->a_af; 136565532Snectar p = (char *)(void *)(ai->ai_addr); 136655163Sshin#ifdef FAITH 136755163Sshin if (translate == 1) 136865532Snectar memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen); 136955163Sshin else 137055163Sshin#endif 137165532Snectar memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen); 137255163Sshin return ai; 137355163Sshin} 137455163Sshin 1375190525Sume/* XXX need to malloc() the same way we do from other functions! */ 1376190525Sumestatic struct addrinfo * 1377190525Sumecopy_ai(const struct addrinfo *pai) 1378190525Sume{ 1379190525Sume struct addrinfo *ai; 1380190525Sume size_t l; 1381190525Sume 1382190525Sume l = sizeof(*ai) + pai->ai_addrlen; 1383190525Sume if ((ai = (struct addrinfo *)malloc(l)) == NULL) 1384190525Sume return NULL; 1385190525Sume memset(ai, 0, l); 1386190525Sume memcpy(ai, pai, sizeof(*ai)); 1387190525Sume ai->ai_addr = (struct sockaddr *)(void *)(ai + 1); 1388190525Sume memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen); 1389190525Sume 1390190525Sume if (pai->ai_canonname) { 1391190525Sume l = strlen(pai->ai_canonname) + 1; 1392190525Sume if ((ai->ai_canonname = malloc(l)) == NULL) { 1393190525Sume free(ai); 1394190525Sume return NULL; 1395190525Sume } 1396190525Sume strlcpy(ai->ai_canonname, pai->ai_canonname, l); 1397190525Sume } else { 1398190525Sume /* just to make sure */ 1399190525Sume ai->ai_canonname = NULL; 1400190525Sume } 1401190525Sume 1402190525Sume ai->ai_next = NULL; 1403190525Sume 1404190525Sume return ai; 1405190525Sume} 1406190525Sume 140755163Sshinstatic int 1408157119Sumeget_portmatch(const struct addrinfo *ai, const char *servname) 140955163Sshin{ 141061877Sume 1411140908Sume /* get_port does not touch first argument when matchonly == 1. */ 141261877Sume /* LINTED const cast */ 141355163Sshin return get_port((struct addrinfo *)ai, servname, 1); 141455163Sshin} 141555163Sshin 141655163Sshinstatic int 1417157119Sumeget_port(struct addrinfo *ai, const char *servname, int matchonly) 141855163Sshin{ 141955163Sshin const char *proto; 142055163Sshin struct servent *sp; 1421160593Sume int port, error; 142255163Sshin int allownumeric; 142355163Sshin 142455163Sshin if (servname == NULL) 142555163Sshin return 0; 142661877Sume switch (ai->ai_family) { 142761877Sume case AF_INET: 142861877Sume#ifdef AF_INET6 142961877Sume case AF_INET6: 143055163Sshin#endif 143161877Sume break; 143261877Sume default: 143355163Sshin return 0; 143461877Sume } 143555163Sshin 143655163Sshin switch (ai->ai_socktype) { 143755163Sshin case SOCK_RAW: 143855163Sshin return EAI_SERVICE; 143955163Sshin case SOCK_DGRAM: 144055163Sshin case SOCK_STREAM: 1441190416Sume case SOCK_SEQPACKET: 144255163Sshin allownumeric = 1; 144355163Sshin break; 144455163Sshin case ANY: 1445190382Sume switch (ai->ai_family) { 1446190382Sume case AF_INET: 1447190382Sume#ifdef AF_INET6 1448190382Sume case AF_INET6: 1449190382Sume#endif 1450190382Sume allownumeric = 1; 1451190382Sume break; 1452190382Sume default: 1453190382Sume allownumeric = 0; 1454190382Sume break; 1455190382Sume } 145655163Sshin break; 145755163Sshin default: 145855163Sshin return EAI_SOCKTYPE; 145955163Sshin } 146055163Sshin 1461160593Sume error = str2number(servname, &port); 1462160593Sume if (error == 0) { 146355163Sshin if (!allownumeric) 146455163Sshin return EAI_SERVICE; 146555163Sshin if (port < 0 || port > 65535) 146655163Sshin return EAI_SERVICE; 1467105940Sume port = htons(port); 146855163Sshin } else { 1469140908Sume if (ai->ai_flags & AI_NUMERICSERV) 1470140908Sume return EAI_NONAME; 1471190416Sume 1472190416Sume switch (ai->ai_protocol) { 1473190416Sume case IPPROTO_UDP: 147455163Sshin proto = "udp"; 147555163Sshin break; 1476190416Sume case IPPROTO_TCP: 147755163Sshin proto = "tcp"; 147855163Sshin break; 1479190416Sume case IPPROTO_SCTP: 1480190416Sume proto = "sctp"; 1481190416Sume break; 1482265946Skevlo case IPPROTO_UDPLITE: 1483265946Skevlo proto = "udplite"; 1484265946Skevlo break; 148555163Sshin default: 148655163Sshin proto = NULL; 148755163Sshin break; 148855163Sshin } 148955163Sshin 1490145118Sume if ((sp = getservbyname(servname, proto)) == NULL) 149155163Sshin return EAI_SERVICE; 149255163Sshin port = sp->s_port; 149355163Sshin } 149455163Sshin 149555163Sshin if (!matchonly) { 149655163Sshin switch (ai->ai_family) { 149755163Sshin case AF_INET: 149861877Sume ((struct sockaddr_in *)(void *) 149961877Sume ai->ai_addr)->sin_port = port; 150055163Sshin break; 150155163Sshin#ifdef INET6 150255163Sshin case AF_INET6: 150361877Sume ((struct sockaddr_in6 *)(void *) 150461877Sume ai->ai_addr)->sin6_port = port; 150555163Sshin break; 150655163Sshin#endif 150755163Sshin } 150855163Sshin } 150955163Sshin 151055163Sshin return 0; 151155163Sshin} 151255163Sshin 151355163Sshinstatic const struct afd * 1514157119Sumefind_afd(int af) 151555163Sshin{ 151655163Sshin const struct afd *afd; 151755163Sshin 151855163Sshin if (af == PF_UNSPEC) 151955163Sshin return NULL; 152055163Sshin for (afd = afdl; afd->a_af; afd++) { 152155163Sshin if (afd->a_af == af) 152255163Sshin return afd; 152355163Sshin } 152455163Sshin return NULL; 152555163Sshin} 152661877Sume 152761877Sume/* 152861877Sume * post-2553: AI_ADDRCONFIG check. if we use getipnodeby* as backend, backend 152961877Sume * will take care of it. 153061877Sume * the semantics of AI_ADDRCONFIG is not defined well. we are not sure 153161877Sume * if the code is right or not. 1532121474Sume * 1533121474Sume * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with 1534121474Sume * _dns_getaddrinfo. 153561877Sume */ 153661877Sumestatic int 1537157119Sumeaddrconfig(struct addrinfo *pai) 153861877Sume{ 1539121474Sume int s, af; 154061877Sume 1541121474Sume /* 1542121474Sume * TODO: 1543121474Sume * Note that implementation dependent test for address 1544121474Sume * configuration should be done everytime called 1545121474Sume * (or apropriate interval), 1546121474Sume * because addresses will be dynamically assigned or deleted. 1547121474Sume */ 1548121474Sume af = pai->ai_family; 1549121474Sume if (af == AF_UNSPEC) { 1550255328Sjilles if ((s = _socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0)) < 0) 1551121474Sume af = AF_INET; 1552121474Sume else { 1553121474Sume _close(s); 1554255328Sjilles if ((s = _socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 1555255328Sjilles 0)) < 0) 1556121474Sume af = AF_INET6; 1557121474Sume else 1558121474Sume _close(s); 1559121474Sume } 1560121474Sume } 1561121474Sume if (af != AF_UNSPEC) { 1562255328Sjilles if ((s = _socket(af, SOCK_DGRAM | SOCK_CLOEXEC, 0)) < 0) 156361877Sume return 0; 1564121474Sume _close(s); 1565121474Sume } 1566121474Sume pai->ai_family = af; 156761877Sume return 1; 156861877Sume} 156961877Sume 157061877Sume#ifdef INET6 157161877Sume/* convert a string to a scope identifier. XXX: IPv6 specific */ 157261877Sumestatic int 1573157119Sumeip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid) 157461877Sume{ 1575105943Sume u_long lscopeid; 1576121474Sume struct in6_addr *a6; 157761877Sume char *ep; 157861877Sume 1579121474Sume a6 = &sin6->sin6_addr; 1580121474Sume 158162836Sitojun /* empty scopeid portion is invalid */ 158262836Sitojun if (*scope == '\0') 158362836Sitojun return -1; 158462836Sitojun 1585229766Sume if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) || 1586229766Sume IN6_IS_ADDR_MC_NODELOCAL(a6)) { 158761877Sume /* 158861877Sume * We currently assume a one-to-one mapping between links 158961877Sume * and interfaces, so we simply use interface indices for 159061877Sume * like-local scopes. 159161877Sume */ 1592105943Sume *scopeid = if_nametoindex(scope); 1593105943Sume if (*scopeid == 0) 159461877Sume goto trynumeric; 1595105943Sume return 0; 159661877Sume } 159761877Sume 159861877Sume /* still unclear about literal, allow numeric only - placeholder */ 159961877Sume if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6)) 160061877Sume goto trynumeric; 160161877Sume if (IN6_IS_ADDR_MC_ORGLOCAL(a6)) 160261877Sume goto trynumeric; 160361877Sume else 160461877Sume goto trynumeric; /* global */ 160561877Sume 160661877Sume /* try to convert to a numeric id as a last resort */ 1607121474Sume trynumeric: 1608105943Sume errno = 0; 1609105943Sume lscopeid = strtoul(scope, &ep, 10); 1610105943Sume *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL); 1611105943Sume if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid) 1612105943Sume return 0; 161361877Sume else 161461877Sume return -1; 161561877Sume} 161661877Sume#endif 161761877Sume 1618158115Sume 1619158115Sume#ifdef NS_CACHING 1620158115Sumestatic int 1621158115Sumeaddrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap, 1622158115Sume void *cache_mdata) 1623158115Sume{ 1624158115Sume res_state statp; 1625158115Sume u_long res_options; 1626158115Sume 1627158115Sume const int op_id = 0; /* identifies the getaddrinfo for the cache */ 1628158115Sume char *hostname; 1629158115Sume struct addrinfo *hints; 1630158115Sume 1631158115Sume char *p; 1632158115Sume int ai_flags, ai_family, ai_socktype, ai_protocol; 1633158115Sume size_t desired_size, size; 1634158115Sume 1635158115Sume statp = __res_state(); 1636158115Sume res_options = statp->options & (RES_RECURSE | RES_DEFNAMES | 1637158115Sume RES_DNSRCH | RES_NOALIASES | RES_USE_INET6); 1638158115Sume 1639158115Sume hostname = va_arg(ap, char *); 1640158115Sume hints = va_arg(ap, struct addrinfo *); 1641158115Sume 1642158115Sume desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4; 1643158115Sume if (hostname != NULL) { 1644158115Sume size = strlen(hostname); 1645158115Sume desired_size += size + 1; 1646158115Sume } else 1647158115Sume size = 0; 1648158115Sume 1649158115Sume if (desired_size > *buffer_size) { 1650158115Sume *buffer_size = desired_size; 1651158115Sume return (NS_RETURN); 1652158115Sume } 1653158115Sume 1654158115Sume if (hints == NULL) 1655158115Sume ai_flags = ai_family = ai_socktype = ai_protocol = 0; 1656158115Sume else { 1657158115Sume ai_flags = hints->ai_flags; 1658158115Sume ai_family = hints->ai_family; 1659158115Sume ai_socktype = hints->ai_socktype; 1660158115Sume ai_protocol = hints->ai_protocol; 1661158115Sume } 1662158115Sume 1663158115Sume p = buffer; 1664158115Sume memcpy(p, &res_options, sizeof(res_options)); 1665158115Sume p += sizeof(res_options); 1666158115Sume 1667158115Sume memcpy(p, &op_id, sizeof(int)); 1668158115Sume p += sizeof(int); 1669158115Sume 1670158115Sume memcpy(p, &ai_flags, sizeof(int)); 1671158115Sume p += sizeof(int); 1672158115Sume 1673158115Sume memcpy(p, &ai_family, sizeof(int)); 1674158115Sume p += sizeof(int); 1675158115Sume 1676158115Sume memcpy(p, &ai_socktype, sizeof(int)); 1677158115Sume p += sizeof(int); 1678158115Sume 1679158115Sume memcpy(p, &ai_protocol, sizeof(int)); 1680158115Sume p += sizeof(int); 1681158115Sume 1682158115Sume if (hostname != NULL) 1683158115Sume memcpy(p, hostname, size); 1684158115Sume 1685158115Sume *buffer_size = desired_size; 1686158115Sume return (NS_SUCCESS); 1687158115Sume} 1688158115Sume 1689158115Sumestatic int 1690158115Sumeaddrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval, 1691158115Sume va_list ap, void *cache_mdata) 1692158115Sume{ 1693158115Sume struct addrinfo *ai, *cai; 1694158115Sume char *p; 1695158115Sume size_t desired_size, size, ai_size; 1696158115Sume 1697158115Sume ai = *((struct addrinfo **)retval); 1698158115Sume 1699158115Sume desired_size = sizeof(size_t); 1700158115Sume ai_size = 0; 1701158115Sume for (cai = ai; cai != NULL; cai = cai->ai_next) { 1702158115Sume desired_size += sizeof(struct addrinfo) + cai->ai_addrlen; 1703158115Sume if (cai->ai_canonname != NULL) 1704158115Sume desired_size += sizeof(size_t) + 1705158115Sume strlen(cai->ai_canonname); 1706158115Sume ++ai_size; 1707158115Sume } 1708158115Sume 1709158115Sume if (desired_size > *buffer_size) { 1710158115Sume /* this assignment is here for future use */ 1711158115Sume errno = ERANGE; 1712158115Sume *buffer_size = desired_size; 1713158115Sume return (NS_RETURN); 1714158115Sume } 1715158115Sume 1716158115Sume memset(buffer, 0, desired_size); 1717158115Sume p = buffer; 1718158115Sume 1719158115Sume memcpy(p, &ai_size, sizeof(size_t)); 1720158115Sume p += sizeof(size_t); 1721158115Sume for (cai = ai; cai != NULL; cai = cai->ai_next) { 1722158115Sume memcpy(p, cai, sizeof(struct addrinfo)); 1723158115Sume p += sizeof(struct addrinfo); 1724158115Sume 1725158115Sume memcpy(p, cai->ai_addr, cai->ai_addrlen); 1726158115Sume p += cai->ai_addrlen; 1727158115Sume 1728158115Sume if (cai->ai_canonname != NULL) { 1729158115Sume size = strlen(cai->ai_canonname); 1730158115Sume memcpy(p, &size, sizeof(size_t)); 1731158115Sume p += sizeof(size_t); 1732158115Sume 1733158115Sume memcpy(p, cai->ai_canonname, size); 1734158115Sume p += size; 1735158115Sume } 1736158115Sume } 1737158115Sume 1738158115Sume return (NS_SUCCESS); 1739158115Sume} 1740158115Sume 1741158115Sumestatic int 1742158115Sumeaddrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval, 1743158115Sume va_list ap, void *cache_mdata) 1744158115Sume{ 1745158115Sume struct addrinfo new_ai, *result, *sentinel, *lasts; 1746158115Sume 1747158115Sume char *p; 1748158115Sume size_t ai_size, ai_i, size; 1749158115Sume 1750158115Sume p = buffer; 1751158115Sume memcpy(&ai_size, p, sizeof(size_t)); 1752158115Sume p += sizeof(size_t); 1753158115Sume 1754158115Sume result = NULL; 1755158115Sume lasts = NULL; 1756158115Sume for (ai_i = 0; ai_i < ai_size; ++ai_i) { 1757158115Sume memcpy(&new_ai, p, sizeof(struct addrinfo)); 1758158115Sume p += sizeof(struct addrinfo); 1759158115Sume size = new_ai.ai_addrlen + sizeof(struct addrinfo) + 1760158115Sume _ALIGNBYTES; 1761158115Sume 1762158115Sume sentinel = (struct addrinfo *)malloc(size); 1763158115Sume memset(sentinel, 0, size); 1764158115Sume 1765158115Sume memcpy(sentinel, &new_ai, sizeof(struct addrinfo)); 1766158115Sume sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel + 1767158115Sume sizeof(struct addrinfo)); 1768158115Sume 1769158115Sume memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen); 1770158115Sume p += new_ai.ai_addrlen; 1771158115Sume 1772158115Sume if (new_ai.ai_canonname != NULL) { 1773158115Sume memcpy(&size, p, sizeof(size_t)); 1774158115Sume p += sizeof(size_t); 1775158115Sume 1776158115Sume sentinel->ai_canonname = (char *)malloc(size + 1); 1777158115Sume memset(sentinel->ai_canonname, 0, size + 1); 1778158115Sume 1779158115Sume memcpy(sentinel->ai_canonname, p, size); 1780158115Sume p += size; 1781158115Sume } 1782158115Sume 1783158115Sume if (result == NULL) { 1784158115Sume result = sentinel; 1785158115Sume lasts = sentinel; 1786158115Sume } else { 1787158115Sume lasts->ai_next = sentinel; 1788158115Sume lasts = sentinel; 1789158115Sume } 1790158115Sume } 1791158115Sume 1792158115Sume *((struct addrinfo **)retval) = result; 1793158115Sume return (NS_SUCCESS); 1794158115Sume} 1795158115Sume#endif /* NS_CACHING */ 1796158115Sume 1797121426Sume/* 1798121426Sume * FQDN hostname, DNS lookup 1799121426Sume */ 1800102237Spirzykstatic int 1801157119Sumeexplore_fqdn(const struct addrinfo *pai, const char *hostname, 1802157119Sume const char *servname, struct addrinfo **res) 1803102237Spirzyk{ 1804121426Sume struct addrinfo *result; 1805121426Sume struct addrinfo *cur; 1806121426Sume int error = 0; 1807158115Sume 1808158115Sume#ifdef NS_CACHING 1809158115Sume static const nss_cache_info cache_info = 1810158115Sume NS_COMMON_CACHE_INFO_INITIALIZER( 1811158115Sume hosts, NULL, addrinfo_id_func, addrinfo_marshal_func, 1812158115Sume addrinfo_unmarshal_func); 1813158115Sume#endif 1814121426Sume static const ns_dtab dtab[] = { 1815121426Sume NS_FILES_CB(_files_getaddrinfo, NULL) 1816121426Sume { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */ 1817121426Sume NS_NIS_CB(_yp_getaddrinfo, NULL) 1818158115Sume#ifdef NS_CACHING 1819158115Sume NS_CACHE_CB(&cache_info) 1820158115Sume#endif 1821121426Sume { 0 } 1822121426Sume }; 1823102237Spirzyk 1824121426Sume result = NULL; 1825121426Sume 1826121426Sume /* 1827121426Sume * if the servname does not match socktype/protocol, ignore it. 1828121426Sume */ 1829126243Sgreen if (get_portmatch(pai, servname) != 0) 1830102237Spirzyk return 0; 1831102237Spirzyk 1832121426Sume switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo", 1833121426Sume default_dns_files, hostname, pai)) { 1834121426Sume case NS_TRYAGAIN: 1835121426Sume error = EAI_AGAIN; 1836121426Sume goto free; 1837121426Sume case NS_UNAVAIL: 1838121426Sume error = EAI_FAIL; 1839121426Sume goto free; 1840121426Sume case NS_NOTFOUND: 1841121426Sume error = EAI_NONAME; 1842121426Sume goto free; 1843121426Sume case NS_SUCCESS: 1844121426Sume error = 0; 1845121426Sume for (cur = result; cur; cur = cur->ai_next) { 1846121426Sume GET_PORT(cur, servname); 1847121426Sume /* canonname should be filled already */ 1848121426Sume } 1849121426Sume break; 1850102237Spirzyk } 1851102237Spirzyk 1852121426Sume *res = result; 1853121426Sume 1854102237Spirzyk return 0; 1855121426Sume 1856121426Sumefree: 1857121426Sume if (result) 1858121426Sume freeaddrinfo(result); 1859121426Sume return error; 1860102237Spirzyk} 1861102237Spirzyk 186261877Sume#ifdef DEBUG 186361877Sumestatic const char AskedForGot[] = 186461877Sume "gethostby*.getanswer: asked for \"%s\", got \"%s\""; 186561877Sume#endif 186661877Sume 186761877Sumestatic struct addrinfo * 1868157119Sumegetanswer(const querybuf *answer, int anslen, const char *qname, int qtype, 1869157119Sume const struct addrinfo *pai, res_state res) 187061877Sume{ 187161877Sume struct addrinfo sentinel, *cur; 187261877Sume struct addrinfo ai; 187361877Sume const struct afd *afd; 187461877Sume char *canonname; 187561877Sume const HEADER *hp; 187661877Sume const u_char *cp; 187761877Sume int n; 187861877Sume const u_char *eom; 1879105940Sume char *bp, *ep; 1880105940Sume int type, class, ancount, qdcount; 188161877Sume int haveanswer, had_error; 188261877Sume char tbuf[MAXDNAME]; 188392905Sobrien int (*name_ok)(const char *); 188461877Sume char hostbuf[8*1024]; 188561877Sume 188661877Sume memset(&sentinel, 0, sizeof(sentinel)); 188761877Sume cur = &sentinel; 188861877Sume 188961877Sume canonname = NULL; 189061877Sume eom = answer->buf + anslen; 189161877Sume switch (qtype) { 189261877Sume case T_A: 189361877Sume case T_AAAA: 189461877Sume case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/ 189561877Sume name_ok = res_hnok; 189661877Sume break; 189761877Sume default: 189861877Sume return (NULL); /* XXX should be abort(); */ 189961877Sume } 190061877Sume /* 190161877Sume * find first satisfactory answer 190261877Sume */ 190361877Sume hp = &answer->hdr; 190461877Sume ancount = ntohs(hp->ancount); 190561877Sume qdcount = ntohs(hp->qdcount); 190661877Sume bp = hostbuf; 1907105940Sume ep = hostbuf + sizeof hostbuf; 190861877Sume cp = answer->buf + HFIXEDSZ; 190961877Sume if (qdcount != 1) { 1910156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 191161877Sume return (NULL); 191261877Sume } 1913105940Sume n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 191461877Sume if ((n < 0) || !(*name_ok)(bp)) { 1915156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 191661877Sume return (NULL); 191761877Sume } 191861877Sume cp += n + QFIXEDSZ; 191961877Sume if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) { 192061877Sume /* res_send() has already verified that the query name is the 192161877Sume * same as the one we sent; this just gets the expanded name 192261877Sume * (i.e., with the succeeding search-domain tacked on). 192361877Sume */ 192461877Sume n = strlen(bp) + 1; /* for the \0 */ 192561877Sume if (n >= MAXHOSTNAMELEN) { 1926156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 192761877Sume return (NULL); 192861877Sume } 192961877Sume canonname = bp; 193061877Sume bp += n; 193161877Sume /* The qname can be abbreviated, but h_name is now absolute. */ 193261877Sume qname = canonname; 193361877Sume } 193461877Sume haveanswer = 0; 193561877Sume had_error = 0; 193661877Sume while (ancount-- > 0 && cp < eom && !had_error) { 1937105940Sume n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 193861877Sume if ((n < 0) || !(*name_ok)(bp)) { 193961877Sume had_error++; 194061877Sume continue; 194161877Sume } 194261877Sume cp += n; /* name */ 194361877Sume type = _getshort(cp); 194461877Sume cp += INT16SZ; /* type */ 194561877Sume class = _getshort(cp); 194661877Sume cp += INT16SZ + INT32SZ; /* class, TTL */ 194761877Sume n = _getshort(cp); 194861877Sume cp += INT16SZ; /* len */ 194961877Sume if (class != C_IN) { 195061877Sume /* XXX - debug? syslog? */ 195161877Sume cp += n; 195261877Sume continue; /* XXX - had_error++ ? */ 195361877Sume } 195461877Sume if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) && 195561877Sume type == T_CNAME) { 195661877Sume n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 195761877Sume if ((n < 0) || !(*name_ok)(tbuf)) { 195861877Sume had_error++; 195961877Sume continue; 196061877Sume } 196161877Sume cp += n; 196261877Sume /* Get canonical name. */ 196361877Sume n = strlen(tbuf) + 1; /* for the \0 */ 1964105940Sume if (n > ep - bp || n >= MAXHOSTNAMELEN) { 196561877Sume had_error++; 196661877Sume continue; 196761877Sume } 1968114443Snectar strlcpy(bp, tbuf, ep - bp); 196961877Sume canonname = bp; 197061877Sume bp += n; 197161877Sume continue; 197261877Sume } 197361877Sume if (qtype == T_ANY) { 197461877Sume if (!(type == T_A || type == T_AAAA)) { 197561877Sume cp += n; 197661877Sume continue; 197761877Sume } 197861877Sume } else if (type != qtype) { 197961877Sume#ifdef DEBUG 1980188316Sume if (type != T_KEY && type != T_SIG && 1981188316Sume type != ns_t_dname) 198261877Sume syslog(LOG_NOTICE|LOG_AUTH, 198361877Sume "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", 198461877Sume qname, p_class(C_IN), p_type(qtype), 198561877Sume p_type(type)); 198661877Sume#endif 198761877Sume cp += n; 198861877Sume continue; /* XXX - had_error++ ? */ 198961877Sume } 199061877Sume switch (type) { 199161877Sume case T_A: 199261877Sume case T_AAAA: 199361877Sume if (strcasecmp(canonname, bp) != 0) { 199461877Sume#ifdef DEBUG 199561877Sume syslog(LOG_NOTICE|LOG_AUTH, 199661877Sume AskedForGot, canonname, bp); 199761877Sume#endif 199861877Sume cp += n; 199961877Sume continue; /* XXX - had_error++ ? */ 200061877Sume } 200161877Sume if (type == T_A && n != INADDRSZ) { 200261877Sume cp += n; 200361877Sume continue; 200461877Sume } 200561877Sume if (type == T_AAAA && n != IN6ADDRSZ) { 200661877Sume cp += n; 200761877Sume continue; 200861877Sume } 200961877Sume#ifdef FILTER_V4MAPPED 201061877Sume if (type == T_AAAA) { 201161877Sume struct in6_addr in6; 201261877Sume memcpy(&in6, cp, sizeof(in6)); 201361877Sume if (IN6_IS_ADDR_V4MAPPED(&in6)) { 201461877Sume cp += n; 201561877Sume continue; 201661877Sume } 201761877Sume } 201861877Sume#endif 201961877Sume if (!haveanswer) { 202061877Sume int nn; 202161877Sume 202261877Sume canonname = bp; 202361877Sume nn = strlen(bp) + 1; /* for the \0 */ 202461877Sume bp += nn; 202561877Sume } 202661877Sume 202761877Sume /* don't overwrite pai */ 202861877Sume ai = *pai; 202961877Sume ai.ai_family = (type == T_A) ? AF_INET : AF_INET6; 203061877Sume afd = find_afd(ai.ai_family); 203161877Sume if (afd == NULL) { 203261877Sume cp += n; 203361877Sume continue; 203461877Sume } 203561877Sume cur->ai_next = get_ai(&ai, afd, (const char *)cp); 203661877Sume if (cur->ai_next == NULL) 203761877Sume had_error++; 203861877Sume while (cur && cur->ai_next) 203961877Sume cur = cur->ai_next; 204061877Sume cp += n; 204161877Sume break; 204261877Sume default: 204361877Sume abort(); 204461877Sume } 204561877Sume if (!had_error) 204661877Sume haveanswer++; 204761877Sume } 204861877Sume if (haveanswer) { 2049102237Spirzyk#if defined(RESOLVSORT) 2050102237Spirzyk /* 2051102237Spirzyk * We support only IPv4 address for backward 2052102237Spirzyk * compatibility against gethostbyname(3). 2053102237Spirzyk */ 2054156960Sume if (res->nsort && qtype == T_A) { 2055156960Sume if (addr4sort(&sentinel, res) < 0) { 2056102237Spirzyk freeaddrinfo(sentinel.ai_next); 2057156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 2058102237Spirzyk return NULL; 2059102237Spirzyk } 2060102237Spirzyk } 2061102237Spirzyk#endif /*RESOLVSORT*/ 206261877Sume if (!canonname) 206361877Sume (void)get_canonname(pai, sentinel.ai_next, qname); 206461877Sume else 206561877Sume (void)get_canonname(pai, sentinel.ai_next, canonname); 2066156960Sume RES_SET_H_ERRNO(res, NETDB_SUCCESS); 206761877Sume return sentinel.ai_next; 206861877Sume } 206961877Sume 2070156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 207161877Sume return NULL; 207261877Sume} 207361877Sume 2074121426Sume#ifdef RESOLVSORT 2075121426Sumestruct addr_ptr { 2076121426Sume struct addrinfo *ai; 2077121426Sume int aval; 2078121426Sume}; 2079121426Sume 2080121426Sumestatic int 2081156960Sumeaddr4sort(struct addrinfo *sentinel, res_state res) 2082121426Sume{ 2083121426Sume struct addrinfo *ai; 2084121426Sume struct addr_ptr *addrs, addr; 2085121426Sume struct sockaddr_in *sin; 2086121426Sume int naddrs, i, j; 2087121426Sume int needsort = 0; 2088121426Sume 2089121426Sume if (!sentinel) 2090121426Sume return -1; 2091121426Sume naddrs = 0; 2092121426Sume for (ai = sentinel->ai_next; ai; ai = ai->ai_next) 2093121426Sume naddrs++; 2094121426Sume if (naddrs < 2) 2095121426Sume return 0; /* We don't need sorting. */ 2096121426Sume if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL) 2097121426Sume return -1; 2098121426Sume i = 0; 2099121426Sume for (ai = sentinel->ai_next; ai; ai = ai->ai_next) { 2100121426Sume sin = (struct sockaddr_in *)ai->ai_addr; 2101156960Sume for (j = 0; (unsigned)j < res->nsort; j++) { 2102157119Sume if (res->sort_list[j].addr.s_addr == 2103156960Sume (sin->sin_addr.s_addr & res->sort_list[j].mask)) 2104121426Sume break; 2105121426Sume } 2106121426Sume addrs[i].ai = ai; 2107121426Sume addrs[i].aval = j; 2108121426Sume if (needsort == 0 && i > 0 && j < addrs[i - 1].aval) 2109121426Sume needsort = i; 2110121426Sume i++; 2111121426Sume } 2112121426Sume if (!needsort) { 2113121426Sume free(addrs); 2114121426Sume return 0; 2115121426Sume } 2116121426Sume 2117121426Sume while (needsort < naddrs) { 2118157371Sume for (j = needsort - 1; j >= 0; j--) { 2119157371Sume if (addrs[j].aval > addrs[j+1].aval) { 2120157371Sume addr = addrs[j]; 2121157371Sume addrs[j] = addrs[j + 1]; 2122157371Sume addrs[j + 1] = addr; 2123157371Sume } else 2124157371Sume break; 2125157371Sume } 2126157371Sume needsort++; 2127121426Sume } 2128121426Sume 2129121426Sume ai = sentinel; 2130121426Sume for (i = 0; i < naddrs; ++i) { 2131121426Sume ai->ai_next = addrs[i].ai; 2132121426Sume ai = ai->ai_next; 2133121426Sume } 2134121426Sume ai->ai_next = NULL; 2135121426Sume free(addrs); 2136121426Sume return 0; 2137121426Sume} 2138121426Sume#endif /*RESOLVSORT*/ 2139121426Sume 214061877Sume/*ARGSUSED*/ 214161877Sumestatic int 2142157119Sume_dns_getaddrinfo(void *rv, void *cb_data, va_list ap) 214361877Sume{ 214461877Sume struct addrinfo *ai; 2145103357Sume querybuf *buf, *buf2; 2146130600Sume const char *hostname; 214765532Snectar const struct addrinfo *pai; 214861877Sume struct addrinfo sentinel, *cur; 214961877Sume struct res_target q, q2; 2150156960Sume res_state res; 215161877Sume 2152130600Sume hostname = va_arg(ap, char *); 215365532Snectar pai = va_arg(ap, const struct addrinfo *); 215465532Snectar 2155156946Sdelphij memset(&q, 0, sizeof(q)); 215661877Sume memset(&q2, 0, sizeof(q2)); 215761877Sume memset(&sentinel, 0, sizeof(sentinel)); 215861877Sume cur = &sentinel; 215961877Sume 2160103357Sume buf = malloc(sizeof(*buf)); 2161103357Sume if (!buf) { 2162156960Sume RES_SET_H_ERRNO(res, NETDB_INTERNAL); 2163103357Sume return NS_NOTFOUND; 2164103357Sume } 2165103357Sume buf2 = malloc(sizeof(*buf2)); 2166103357Sume if (!buf2) { 2167103357Sume free(buf); 2168156960Sume RES_SET_H_ERRNO(res, NETDB_INTERNAL); 2169103357Sume return NS_NOTFOUND; 2170103357Sume } 2171103357Sume 217261877Sume switch (pai->ai_family) { 217361877Sume case AF_UNSPEC: 2174130600Sume q.name = hostname; 217562614Sitojun q.qclass = C_IN; 2176140896Sume q.qtype = T_A; 2177103357Sume q.answer = buf->buf; 2178103357Sume q.anslen = sizeof(buf->buf); 217961877Sume q.next = &q2; 2180130600Sume q2.name = hostname; 218162614Sitojun q2.qclass = C_IN; 2182140896Sume q2.qtype = T_AAAA; 2183103357Sume q2.answer = buf2->buf; 2184103357Sume q2.anslen = sizeof(buf2->buf); 218561877Sume break; 218661877Sume case AF_INET: 2187130600Sume q.name = hostname; 218862614Sitojun q.qclass = C_IN; 218962614Sitojun q.qtype = T_A; 2190103357Sume q.answer = buf->buf; 2191103357Sume q.anslen = sizeof(buf->buf); 219261877Sume break; 219361877Sume case AF_INET6: 2194130600Sume q.name = hostname; 219562614Sitojun q.qclass = C_IN; 219662614Sitojun q.qtype = T_AAAA; 2197103357Sume q.answer = buf->buf; 2198103357Sume q.anslen = sizeof(buf->buf); 219961877Sume break; 220061877Sume default: 2201103357Sume free(buf); 2202103357Sume free(buf2); 220365532Snectar return NS_UNAVAIL; 220461877Sume } 2205156960Sume 2206156960Sume res = __res_state(); 2207156960Sume if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) { 2208156960Sume RES_SET_H_ERRNO(res, NETDB_INTERNAL); 2209103357Sume free(buf); 2210103357Sume free(buf2); 221165532Snectar return NS_NOTFOUND; 2212103357Sume } 2213156960Sume 2214156960Sume if (res_searchN(hostname, &q, res) < 0) { 2215156960Sume free(buf); 2216156960Sume free(buf2); 2217156960Sume return NS_NOTFOUND; 2218156960Sume } 2219140896Sume /* prefer IPv6 */ 222061877Sume if (q.next) { 2221156960Sume ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res); 2222140896Sume if (ai) { 222361877Sume cur->ai_next = ai; 2224140896Sume while (cur && cur->ai_next) 2225140896Sume cur = cur->ai_next; 2226140896Sume } 222761877Sume } 2228156960Sume ai = getanswer(buf, q.n, q.name, q.qtype, pai, res); 2229140896Sume if (ai) 2230140896Sume cur->ai_next = ai; 2231103357Sume free(buf); 2232103357Sume free(buf2); 223361877Sume if (sentinel.ai_next == NULL) 2234156960Sume switch (res->res_h_errno) { 223561877Sume case HOST_NOT_FOUND: 223665532Snectar return NS_NOTFOUND; 223761877Sume case TRY_AGAIN: 223865532Snectar return NS_TRYAGAIN; 223961877Sume default: 224065532Snectar return NS_UNAVAIL; 224161877Sume } 224265532Snectar *((struct addrinfo **)rv) = sentinel.ai_next; 224365532Snectar return NS_SUCCESS; 224461877Sume} 224561877Sume 224665532Snectarstatic void 2247144634Sume_sethtent(FILE **hostf) 224865532Snectar{ 2249144634Sume if (!*hostf) 2250254700Sjilles *hostf = fopen(_PATH_HOSTS, "re"); 225165532Snectar else 2252144634Sume rewind(*hostf); 225365532Snectar} 225465532Snectar 225565532Snectarstatic void 2256144634Sume_endhtent(FILE **hostf) 225765532Snectar{ 2258144634Sume if (*hostf) { 2259144634Sume (void) fclose(*hostf); 2260144634Sume *hostf = NULL; 226165532Snectar } 226265532Snectar} 226365532Snectar 226461877Sumestatic struct addrinfo * 2265144634Sume_gethtent(FILE **hostf, const char *name, const struct addrinfo *pai) 226661877Sume{ 226761877Sume char *p; 226861877Sume char *cp, *tname, *cname; 226961877Sume struct addrinfo hints, *res0, *res; 227061877Sume int error; 227161877Sume const char *addr; 227261877Sume char hostbuf[8*1024]; 227361877Sume 2274254700Sjilles if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "re"))) 227565532Snectar return (NULL); 2276105940Sumeagain: 2277144634Sume if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf))) 227861877Sume return (NULL); 227961877Sume if (*p == '#') 228061877Sume goto again; 2281139612Ssobomax cp = strpbrk(p, "#\n"); 2282139612Ssobomax if (cp != NULL) 2283139612Ssobomax *cp = '\0'; 228461877Sume if (!(cp = strpbrk(p, " \t"))) 228561877Sume goto again; 228661877Sume *cp++ = '\0'; 228761877Sume addr = p; 228861877Sume cname = NULL; 228961877Sume /* if this is not something we're looking for, skip it. */ 229061877Sume while (cp && *cp) { 229161877Sume if (*cp == ' ' || *cp == '\t') { 229261877Sume cp++; 229361877Sume continue; 229461877Sume } 229561877Sume tname = cp; 229661877Sume if (cname == NULL) 229761877Sume cname = cp; 229861877Sume if ((cp = strpbrk(cp, " \t")) != NULL) 229961877Sume *cp++ = '\0'; 230061877Sume if (strcasecmp(name, tname) == 0) 230161877Sume goto found; 230261877Sume } 230361877Sume goto again; 230461877Sume 230561877Sumefound: 2306105940Sume /* we should not glob socktype/protocol here */ 2307105940Sume memset(&hints, 0, sizeof(hints)); 2308105940Sume hints.ai_family = pai->ai_family; 2309105940Sume hints.ai_socktype = SOCK_DGRAM; 2310105940Sume hints.ai_protocol = 0; 231161877Sume hints.ai_flags = AI_NUMERICHOST; 2312105940Sume error = getaddrinfo(addr, "0", &hints, &res0); 231361877Sume if (error) 231461877Sume goto again; 231561877Sume#ifdef FILTER_V4MAPPED 231661877Sume /* XXX should check all items in the chain */ 231761877Sume if (res0->ai_family == AF_INET6 && 231861877Sume IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) { 231961877Sume freeaddrinfo(res0); 232061877Sume goto again; 232161877Sume } 232261877Sume#endif 232361877Sume for (res = res0; res; res = res->ai_next) { 232461877Sume /* cover it up */ 232561877Sume res->ai_flags = pai->ai_flags; 2326105940Sume res->ai_socktype = pai->ai_socktype; 2327105940Sume res->ai_protocol = pai->ai_protocol; 232861877Sume 232961877Sume if (pai->ai_flags & AI_CANONNAME) { 233061877Sume if (get_canonname(pai, res, cname) != 0) { 233161877Sume freeaddrinfo(res0); 233261877Sume goto again; 233361877Sume } 233461877Sume } 233561877Sume } 233661877Sume return res0; 233761877Sume} 233861877Sume 233961877Sume/*ARGSUSED*/ 234061877Sumestatic int 2341157119Sume_files_getaddrinfo(void *rv, void *cb_data, va_list ap) 234265532Snectar{ 234365532Snectar const char *name; 234461877Sume const struct addrinfo *pai; 234561877Sume struct addrinfo sentinel, *cur; 234661877Sume struct addrinfo *p; 2347144634Sume FILE *hostf = NULL; 234861877Sume 234965532Snectar name = va_arg(ap, char *); 235065532Snectar pai = va_arg(ap, struct addrinfo *); 235165532Snectar 235265532Snectar memset(&sentinel, 0, sizeof(sentinel)); 235361877Sume cur = &sentinel; 235461877Sume 2355144634Sume _sethtent(&hostf); 2356144634Sume while ((p = _gethtent(&hostf, name, pai)) != NULL) { 235761877Sume cur->ai_next = p; 235861877Sume while (cur && cur->ai_next) 235961877Sume cur = cur->ai_next; 236061877Sume } 2361144634Sume _endhtent(&hostf); 236261877Sume 236365532Snectar *((struct addrinfo **)rv) = sentinel.ai_next; 236465532Snectar if (sentinel.ai_next == NULL) 236565532Snectar return NS_NOTFOUND; 236665532Snectar return NS_SUCCESS; 236761877Sume} 236861877Sume 236961877Sume#ifdef YP 237061877Sume/*ARGSUSED*/ 237165532Snectarstatic struct addrinfo * 2372157119Sume_yphostent(char *line, const struct addrinfo *pai) 237361877Sume{ 237461877Sume struct addrinfo sentinel, *cur; 237565532Snectar struct addrinfo hints, *res, *res0; 237661877Sume int error; 237765532Snectar char *p = line; 237865532Snectar const char *addr, *canonname; 237965532Snectar char *nextline; 238065532Snectar char *cp; 238161877Sume 238265532Snectar addr = canonname = NULL; 238365532Snectar 238465532Snectar memset(&sentinel, 0, sizeof(sentinel)); 238561877Sume cur = &sentinel; 238661877Sume 238765532Snectarnextline: 238865532Snectar /* terminate line */ 238965532Snectar cp = strchr(p, '\n'); 239065532Snectar if (cp) { 239165532Snectar *cp++ = '\0'; 239265532Snectar nextline = cp; 239365532Snectar } else 239465532Snectar nextline = NULL; 239561877Sume 239665532Snectar cp = strpbrk(p, " \t"); 239765532Snectar if (cp == NULL) { 239865532Snectar if (canonname == NULL) 239965532Snectar return (NULL); 240065532Snectar else 240165532Snectar goto done; 240261877Sume } 240365532Snectar *cp++ = '\0'; 240461877Sume 240565532Snectar addr = p; 240661877Sume 240765532Snectar while (cp && *cp) { 240865532Snectar if (*cp == ' ' || *cp == '\t') { 240965532Snectar cp++; 241061877Sume continue; 241165532Snectar } 241265532Snectar if (!canonname) 241365532Snectar canonname = cp; 241465532Snectar if ((cp = strpbrk(cp, " \t")) != NULL) 241565532Snectar *cp++ = '\0'; 241665532Snectar } 241761877Sume 2418121474Sume hints = *pai; 241965532Snectar hints.ai_flags = AI_NUMERICHOST; 2420121474Sume error = getaddrinfo(addr, NULL, &hints, &res0); 242165532Snectar if (error == 0) { 242265532Snectar for (res = res0; res; res = res->ai_next) { 242365532Snectar /* cover it up */ 242465532Snectar res->ai_flags = pai->ai_flags; 242561877Sume 242665532Snectar if (pai->ai_flags & AI_CANONNAME) 242765532Snectar (void)get_canonname(pai, res, canonname); 242861877Sume } 242965532Snectar } else 243065532Snectar res0 = NULL; 243165532Snectar if (res0) { 243265532Snectar cur->ai_next = res0; 243361877Sume while (cur && cur->ai_next) 243461877Sume cur = cur->ai_next; 243561877Sume } 243661877Sume 243765532Snectar if (nextline) { 243865532Snectar p = nextline; 243965532Snectar goto nextline; 244065532Snectar } 244161877Sume 244265532Snectardone: 244365532Snectar return sentinel.ai_next; 244461877Sume} 244565532Snectar 244665532Snectar/*ARGSUSED*/ 244765532Snectarstatic int 2448157119Sume_yp_getaddrinfo(void *rv, void *cb_data, va_list ap) 244965532Snectar{ 245065532Snectar struct addrinfo sentinel, *cur; 245165532Snectar struct addrinfo *ai = NULL; 2452144679Sume char *ypbuf; 2453144679Sume int ypbuflen, r; 245465532Snectar const char *name; 245565532Snectar const struct addrinfo *pai; 2456144679Sume char *ypdomain; 245765532Snectar 2458144679Sume if (_yp_check(&ypdomain) == 0) 2459144679Sume return NS_UNAVAIL; 2460144679Sume 246165532Snectar name = va_arg(ap, char *); 246265532Snectar pai = va_arg(ap, const struct addrinfo *); 246365532Snectar 246465532Snectar memset(&sentinel, 0, sizeof(sentinel)); 246565532Snectar cur = &sentinel; 246665532Snectar 246765532Snectar /* hosts.byname is only for IPv4 (Solaris8) */ 246865532Snectar if (pai->ai_family == PF_UNSPEC || pai->ai_family == PF_INET) { 2469144679Sume r = yp_match(ypdomain, "hosts.byname", name, 2470144679Sume (int)strlen(name), &ypbuf, &ypbuflen); 247165532Snectar if (r == 0) { 247265532Snectar struct addrinfo ai4; 247365532Snectar 247465532Snectar ai4 = *pai; 247565532Snectar ai4.ai_family = AF_INET; 2476144679Sume ai = _yphostent(ypbuf, &ai4); 247765532Snectar if (ai) { 247865532Snectar cur->ai_next = ai; 247965532Snectar while (cur && cur->ai_next) 248065532Snectar cur = cur->ai_next; 248165532Snectar } 2482146190Sume free(ypbuf); 248365532Snectar } 248465532Snectar } 248565532Snectar 248665532Snectar /* ipnodes.byname can hold both IPv4/v6 */ 2487144679Sume r = yp_match(ypdomain, "ipnodes.byname", name, 2488144679Sume (int)strlen(name), &ypbuf, &ypbuflen); 248965532Snectar if (r == 0) { 2490144679Sume ai = _yphostent(ypbuf, pai); 2491144679Sume if (ai) 249265532Snectar cur->ai_next = ai; 2493144679Sume free(ypbuf); 249465532Snectar } 249565532Snectar 249665532Snectar if (sentinel.ai_next == NULL) { 2497156960Sume RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND); 249865532Snectar return NS_NOTFOUND; 249965532Snectar } 250065532Snectar *((struct addrinfo **)rv) = sentinel.ai_next; 250165532Snectar return NS_SUCCESS; 250265532Snectar} 250361877Sume#endif 250461877Sume 250561877Sume/* resolver logic */ 250661877Sume 250761877Sume/* 250861877Sume * Formulate a normal query, send, and await answer. 250961877Sume * Returned answer is placed in supplied buffer "answer". 251061877Sume * Perform preliminary check of answer, returning success only 251161877Sume * if no error is indicated and the answer count is nonzero. 251261877Sume * Return the size of the response on success, -1 on error. 251361877Sume * Error number is left in h_errno. 251461877Sume * 251561877Sume * Caller must parse answer and determine whether it answers the question. 251661877Sume */ 251761877Sumestatic int 2518157119Sumeres_queryN(const char *name, struct res_target *target, res_state res) 251961877Sume{ 2520103357Sume u_char *buf; 252161877Sume HEADER *hp; 252261877Sume int n; 2523157203Sume u_int oflags; 252461877Sume struct res_target *t; 252561877Sume int rcode; 252661877Sume int ancount; 252761877Sume 252861877Sume rcode = NOERROR; 252961877Sume ancount = 0; 253061877Sume 2531103357Sume buf = malloc(MAXPACKET); 2532103357Sume if (!buf) { 2533156960Sume RES_SET_H_ERRNO(res, NETDB_INTERNAL); 2534103357Sume return -1; 2535103357Sume } 2536103357Sume 253761877Sume for (t = target; t; t = t->next) { 253861877Sume int class, type; 253961877Sume u_char *answer; 254061877Sume int anslen; 254161877Sume 254261877Sume hp = (HEADER *)(void *)t->answer; 254361877Sume 254461877Sume /* make it easier... */ 254562614Sitojun class = t->qclass; 254662614Sitojun type = t->qtype; 254761877Sume answer = t->answer; 254861877Sume anslen = t->anslen; 2549157203Sume 2550157203Sume oflags = res->_flags; 2551157203Sume 2552157203Sumeagain: 2553157203Sume hp->rcode = NOERROR; /* default */ 2554157203Sume 255561877Sume#ifdef DEBUG 2556156960Sume if (res->options & RES_DEBUG) 255761877Sume printf(";; res_query(%s, %d, %d)\n", name, class, type); 255861877Sume#endif 255961877Sume 2560156960Sume n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL, 2561103357Sume buf, MAXPACKET); 2562157203Sume if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 && 2563157203Sume (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U) 2564156960Sume n = res_nopt(res, n, buf, MAXPACKET, anslen); 256561877Sume if (n <= 0) { 256661877Sume#ifdef DEBUG 2567156960Sume if (res->options & RES_DEBUG) 256861877Sume printf(";; res_query: mkquery failed\n"); 256961877Sume#endif 2570103357Sume free(buf); 2571156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 257261877Sume return (n); 257361877Sume } 2574156960Sume n = res_nsend(res, buf, n, answer, anslen); 257561877Sume if (n < 0) { 2576157203Sume /* 2577157203Sume * if the query choked with EDNS0, retry 2578157203Sume * without EDNS0 2579157203Sume */ 2580157203Sume if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) 2581157203Sume != 0U && 2582157203Sume ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) { 2583157203Sume res->_flags |= RES_F_EDNS0ERR; 2584157203Sume if (res->options & RES_DEBUG) 2585157203Sume printf(";; res_nquery: retry without EDNS0\n"); 2586157203Sume goto again; 2587157203Sume } 2588157203Sume rcode = hp->rcode; /* record most recent error */ 258961877Sume#ifdef DEBUG 2590156960Sume if (res->options & RES_DEBUG) 259161877Sume printf(";; res_query: send error\n"); 259261877Sume#endif 2593157203Sume continue; 259461877Sume } 259561877Sume 2596157081Sume if (n > anslen) 2597103350Snectar hp->rcode = FORMERR; /* XXX not very informative */ 2598157203Sume if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) { 259961877Sume rcode = hp->rcode; /* record most recent error */ 260061877Sume#ifdef DEBUG 2601156960Sume if (res->options & RES_DEBUG) 2602105940Sume printf(";; rcode = %u, ancount=%u\n", hp->rcode, 260361877Sume ntohs(hp->ancount)); 260461877Sume#endif 260561877Sume continue; 260661877Sume } 260761877Sume 260861877Sume ancount += ntohs(hp->ancount); 260961877Sume 261061877Sume t->n = n; 261161877Sume } 261261877Sume 2613103357Sume free(buf); 2614103357Sume 261561877Sume if (ancount == 0) { 261661877Sume switch (rcode) { 261761877Sume case NXDOMAIN: 2618156960Sume RES_SET_H_ERRNO(res, HOST_NOT_FOUND); 261961877Sume break; 262061877Sume case SERVFAIL: 2621156960Sume RES_SET_H_ERRNO(res, TRY_AGAIN); 262261877Sume break; 262361877Sume case NOERROR: 2624156960Sume RES_SET_H_ERRNO(res, NO_DATA); 262561877Sume break; 262661877Sume case FORMERR: 262761877Sume case NOTIMP: 262861877Sume case REFUSED: 262961877Sume default: 2630156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 263161877Sume break; 263261877Sume } 263361877Sume return (-1); 263461877Sume } 263561877Sume return (ancount); 263661877Sume} 263761877Sume 263861877Sume/* 263961877Sume * Formulate a normal query, send, and retrieve answer in supplied buffer. 264061877Sume * Return the size of the response on success, -1 on error. 264161877Sume * If enabled, implement search rules until answer or unrecoverable failure 264261877Sume * is detected. Error code, if any, is left in h_errno. 264361877Sume */ 264461877Sumestatic int 2645157119Sumeres_searchN(const char *name, struct res_target *target, res_state res) 264661877Sume{ 264761877Sume const char *cp, * const *domain; 264861877Sume HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/ 264961877Sume u_int dots; 265061877Sume int trailing_dot, ret, saved_herrno; 2651155983Sume int got_nodata = 0, got_servfail = 0, root_on_list = 0; 2652155983Sume int tried_as_is = 0; 2653155983Sume int searched = 0; 2654145113Sume char abuf[MAXDNAME]; 265561877Sume 265661877Sume errno = 0; 2657156960Sume RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */ 265861877Sume dots = 0; 265961877Sume for (cp = name; *cp; cp++) 266061877Sume dots += (*cp == '.'); 266161877Sume trailing_dot = 0; 266261877Sume if (cp > name && *--cp == '.') 266361877Sume trailing_dot++; 266461877Sume 266561877Sume /* 266661877Sume * if there aren't any dots, it could be a user-level alias 266761877Sume */ 2668156960Sume if (!dots && 2669156960Sume (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL) 2670156960Sume return (res_queryN(cp, target, res)); 267161877Sume 267261877Sume /* 2673155983Sume * If there are enough dots in the name, let's just give it a 2674155983Sume * try 'as is'. The threshold can be set with the "ndots" option. 2675155983Sume * Also, query 'as is', if there is a trailing dot in the name. 267661877Sume */ 267761877Sume saved_herrno = -1; 2678156960Sume if (dots >= res->ndots || trailing_dot) { 2679156960Sume ret = res_querydomainN(name, NULL, target, res); 2680155983Sume if (ret > 0 || trailing_dot) 268161877Sume return (ret); 2682156155Sume if (errno == ECONNREFUSED) { 2683156960Sume RES_SET_H_ERRNO(res, TRY_AGAIN); 2684156155Sume return (-1); 2685156155Sume } 2686156960Sume switch (res->res_h_errno) { 2687156155Sume case NO_DATA: 2688156155Sume case HOST_NOT_FOUND: 2689156155Sume break; 2690157093Sume case TRY_AGAIN: 2691157093Sume if (hp->rcode == SERVFAIL) 2692157093Sume break; 2693157093Sume /* FALLTHROUGH */ 2694156155Sume default: 2695156155Sume return (-1); 2696156155Sume } 2697156960Sume saved_herrno = res->res_h_errno; 269861877Sume tried_as_is++; 269961877Sume } 270061877Sume 270161877Sume /* 270261877Sume * We do at least one level of search if 270361877Sume * - there is no dot and RES_DEFNAME is set, or 270461877Sume * - there is at least one dot, there is no trailing dot, 270561877Sume * and RES_DNSRCH is set. 270661877Sume */ 2707156960Sume if ((!dots && (res->options & RES_DEFNAMES)) || 2708156960Sume (dots && !trailing_dot && (res->options & RES_DNSRCH))) { 270961877Sume int done = 0; 271061877Sume 2711156960Sume for (domain = (const char * const *)res->dnsrch; 271261877Sume *domain && !done; 271361877Sume domain++) { 2714155983Sume searched = 1; 271561877Sume 2716155983Sume if (domain[0][0] == '\0' || 2717155983Sume (domain[0][0] == '.' && domain[0][1] == '\0')) 2718155983Sume root_on_list++; 2719155983Sume 2720155983Sume if (root_on_list && tried_as_is) 2721155983Sume continue; 2722155983Sume 2723156960Sume ret = res_querydomainN(name, *domain, target, res); 272461877Sume if (ret > 0) 272561877Sume return (ret); 272661877Sume 272761877Sume /* 272861877Sume * If no server present, give up. 272961877Sume * If name isn't found in this domain, 273061877Sume * keep trying higher domains in the search list 273161877Sume * (if that's enabled). 273261877Sume * On a NO_DATA error, keep trying, otherwise 273361877Sume * a wildcard entry of another type could keep us 273461877Sume * from finding this entry higher in the domain. 273561877Sume * If we get some other error (negative answer or 273661877Sume * server failure), then stop searching up, 273761877Sume * but try the input name below in case it's 273861877Sume * fully-qualified. 273961877Sume */ 274061877Sume if (errno == ECONNREFUSED) { 2741156960Sume RES_SET_H_ERRNO(res, TRY_AGAIN); 274261877Sume return (-1); 274361877Sume } 274461877Sume 2745156960Sume switch (res->res_h_errno) { 274661877Sume case NO_DATA: 274761877Sume got_nodata++; 274861877Sume /* FALLTHROUGH */ 274961877Sume case HOST_NOT_FOUND: 275061877Sume /* keep trying */ 275161877Sume break; 275261877Sume case TRY_AGAIN: 2753157093Sume got_servfail++; 275461877Sume if (hp->rcode == SERVFAIL) { 275561877Sume /* try next search element, if any */ 275661877Sume break; 275761877Sume } 275861877Sume /* FALLTHROUGH */ 275961877Sume default: 276061877Sume /* anything else implies that we're done */ 276161877Sume done++; 276261877Sume } 276361877Sume /* 276461877Sume * if we got here for some reason other than DNSRCH, 276561877Sume * we only wanted one iteration of the loop, so stop. 276661877Sume */ 2767156960Sume if (!(res->options & RES_DNSRCH)) 276861877Sume done++; 276961877Sume } 277061877Sume } 277161877Sume 2772156960Sume switch (res->res_h_errno) { 2773156155Sume case NO_DATA: 2774156155Sume case HOST_NOT_FOUND: 2775156155Sume break; 2776157093Sume case TRY_AGAIN: 2777157093Sume if (hp->rcode == SERVFAIL) 2778157093Sume break; 2779157093Sume /* FALLTHROUGH */ 2780156155Sume default: 2781156155Sume goto giveup; 2782156155Sume } 2783156155Sume 278461877Sume /* 2785155983Sume * If the query has not already been tried as is then try it 2786155983Sume * unless RES_NOTLDQUERY is set and there were no dots. 278761877Sume */ 2788156960Sume if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) && 2789155983Sume !(tried_as_is || root_on_list)) { 2790156960Sume ret = res_querydomainN(name, NULL, target, res); 279161877Sume if (ret > 0) 279261877Sume return (ret); 279361877Sume } 279461877Sume 279561877Sume /* 279661877Sume * if we got here, we didn't satisfy the search. 279761877Sume * if we did an initial full query, return that query's h_errno 279861877Sume * (note that we wouldn't be here if that query had succeeded). 279961877Sume * else if we ever got a nodata, send that back as the reason. 280061877Sume * else send back meaningless h_errno, that being the one from 280161877Sume * the last DNSRCH we did. 280261877Sume */ 2803156155Sumegiveup: 280461877Sume if (saved_herrno != -1) 2805156960Sume RES_SET_H_ERRNO(res, saved_herrno); 280661877Sume else if (got_nodata) 2807156960Sume RES_SET_H_ERRNO(res, NO_DATA); 280861877Sume else if (got_servfail) 2809156960Sume RES_SET_H_ERRNO(res, TRY_AGAIN); 281061877Sume return (-1); 281161877Sume} 281261877Sume 281361877Sume/* 281461877Sume * Perform a call on res_query on the concatenation of name and domain, 281561877Sume * removing a trailing dot from name if domain is NULL. 281661877Sume */ 281761877Sumestatic int 2818157119Sumeres_querydomainN(const char *name, const char *domain, 2819157119Sume struct res_target *target, res_state res) 282061877Sume{ 282161877Sume char nbuf[MAXDNAME]; 282261877Sume const char *longname = nbuf; 282361877Sume size_t n, d; 282461877Sume 282561877Sume#ifdef DEBUG 2826156960Sume if (res->options & RES_DEBUG) 282761877Sume printf(";; res_querydomain(%s, %s)\n", 282861877Sume name, domain?domain:"<Nil>"); 282961877Sume#endif 283061877Sume if (domain == NULL) { 283161877Sume /* 283261877Sume * Check for trailing '.'; 283361877Sume * copy without '.' if present. 283461877Sume */ 283561877Sume n = strlen(name); 283661877Sume if (n >= MAXDNAME) { 2837156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 283861877Sume return (-1); 283961877Sume } 284061877Sume if (n > 0 && name[--n] == '.') { 284161877Sume strncpy(nbuf, name, n); 284261877Sume nbuf[n] = '\0'; 284361877Sume } else 284461877Sume longname = name; 284561877Sume } else { 284661877Sume n = strlen(name); 284761877Sume d = strlen(domain); 284861877Sume if (n + d + 1 >= MAXDNAME) { 2849156960Sume RES_SET_H_ERRNO(res, NO_RECOVERY); 285061877Sume return (-1); 285161877Sume } 2852105940Sume snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain); 285361877Sume } 2854156960Sume return (res_queryN(longname, target, res)); 285561877Sume} 2856