diff options
Diffstat (limited to 'newlib/libc/sys/linux/net/getaddrinfo.c')
| -rw-r--r-- | newlib/libc/sys/linux/net/getaddrinfo.c | 1979 |
1 files changed, 0 insertions, 1979 deletions
diff --git a/newlib/libc/sys/linux/net/getaddrinfo.c b/newlib/libc/sys/linux/net/getaddrinfo.c deleted file mode 100644 index 97ba36209..000000000 --- a/newlib/libc/sys/linux/net/getaddrinfo.c +++ /dev/null @@ -1,1979 +0,0 @@ -/* $KAME: getaddrinfo.c,v 1.15 2000/07/09 04:37:24 itojun Exp $ */ - -/* - * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the project nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -/* - * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator. - * - * Issues to be discussed: - * - Thread safe-ness must be checked. - * - Return values. There are nonstandard return values defined and used - * in the source code. This is because RFC2553 is silent about which error - * code must be returned for which situation. - * - freeaddrinfo(NULL). RFC2553 is silent about it. XNET 5.2 says it is - * invalid. - * current code - SEGV on freeaddrinfo(NULL) - * Note: - * - We use getipnodebyname() just for thread-safeness. There's no intent - * to let it do PF_UNSPEC (actually we never pass PF_UNSPEC to - * getipnodebyname(). - * - The code filters out AFs that are not supported by the kernel, - * when globbing NULL hostname (to loopback, or wildcard). Is it the right - * thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG - * in ai_flags? - * - (post-2553) semantics of AI_ADDRCONFIG itself is too vague. - * (1) what should we do against numeric hostname (2) what should we do - * against NULL hostname (3) what is AI_ADDRCONFIG itself. AF not ready? - * non-loopback address configured? global address configured? - * - To avoid search order issue, we have a big amount of code duplicate - * from gethnamaddr.c and some other places. The issues that there's no - * lower layer function to lookup "IPv4 or IPv6" record. Calling - * gethostbyname2 from getaddrinfo will end up in wrong search order, as - * follows: - * - The code makes use of following calls when asked to resolver with - * ai_family = PF_UNSPEC: - * getipnodebyname(host, AF_INET6); - * getipnodebyname(host, AF_INET); - * This will result in the following queries if the node is configure to - * prefer /etc/hosts than DNS: - * lookup /etc/hosts for IPv6 address - * lookup DNS for IPv6 address - * lookup /etc/hosts for IPv4 address - * lookup DNS for IPv4 address - * which may not meet people's requirement. - * The right thing to happen is to have underlying layer which does - * PF_UNSPEC lookup (lookup both) and return chain of addrinfos. - * This would result in a bit of code duplicate with _dns_ghbyname() and - * friends. - */ -/* - * diffs with other KAME platforms: - * - other KAME platforms already nuked FAITH ($GAI), but as FreeBSD - * 4.0-RELEASE supplies it, we still have the code here. - * - AI_ADDRCONFIG support is supplied - * - some of FreeBSD style (#define tabify and others) - * - classful IPv4 numeric (127.1) is allowed. - */ - -#include <sys/cdefs.h> -#include <machine/endian.h> - -#include "namespace.h" -#include <sys/types.h> -#include <sys/types.h> -#include <sys/param.h> -#include <sys/socket.h> -#include <net/if.h> -#include <netinet/in.h> -#include <arpa/inet.h> -#include <arpa/nameser.h> -#include <rpc/rpc.h> -#include <rpcsvc/yp_prot.h> -#include <rpcsvc/ypclnt.h> -#include <netdb.h> -#include <resolv.h> -#include <string.h> -#include <stdlib.h> -#include <stddef.h> -#include <ctype.h> -#include <unistd.h> -#include <stdio.h> -#include <errno.h> -#ifdef DEBUG -#include <syslog.h> -#endif - -#include <syslog.h> -#include <stdarg.h> -#include <nsswitch.h> -#include "un-namespace.h" - -#if defined(__KAME__) && defined(INET6) -# define FAITH -#endif - -#define SUCCESS 0 -#define ANY 0 -#define YES 1 -#define NO 0 - -static const char in_addrany[] = { 0, 0, 0, 0 }; -static const char in6_addrany[] = { - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 -}; -static const char in_loopback[] = { 127, 0, 0, 1 }; -static const char in6_loopback[] = { - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 -}; - -static const struct afd { - int a_af; - int a_addrlen; - int a_socklen; - int a_off; - const char *a_addrany; - const char *a_loopback; - int a_scoped; -} afdl [] = { -#ifdef INET6 -#define N_INET6 0 - {PF_INET6, sizeof(struct in6_addr), - sizeof(struct sockaddr_in6), - offsetof(struct sockaddr_in6, sin6_addr), - in6_addrany, in6_loopback, 1}, -#define N_INET 1 -#else -#define N_INET 0 -#endif - {PF_INET, sizeof(struct in_addr), - sizeof(struct sockaddr_in), - offsetof(struct sockaddr_in, sin_addr), - in_addrany, in_loopback, 0}, - {0, 0, 0, 0, NULL, NULL, 0}, -}; - -struct explore { - int e_af; - int e_socktype; - int e_protocol; - const char *e_protostr; - int e_wild; -#define WILD_AF(ex) ((ex)->e_wild & 0x01) -#define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02) -#define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04) -}; - -static const struct explore explore[] = { -#if 0 - { PF_LOCAL, 0, ANY, ANY, NULL, 0x01 }, -#endif -#ifdef INET6 - { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 }, - { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 }, - { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 }, -#endif - { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 }, - { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 }, - { PF_INET, SOCK_RAW, ANY, NULL, 0x05 }, - { PF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 }, - { PF_UNSPEC, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 }, - { PF_UNSPEC, SOCK_RAW, ANY, NULL, 0x05 }, - { -1, 0, 0, NULL, 0 }, -}; - -#ifdef INET6 -#define PTON_MAX 16 -#else -#define PTON_MAX 4 -#endif - -static const ns_src default_dns_files[] = { - { NSSRC_FILES, NS_SUCCESS }, - { NSSRC_DNS, NS_SUCCESS }, - { 0 } -}; - -#if PACKETSZ > 1024 -#define MAXPACKET PACKETSZ -#else -#define MAXPACKET 1024 -#endif - -typedef union { - HEADER hdr; - u_char buf[MAXPACKET]; -} querybuf; - -struct res_target { - struct res_target *next; - const char *name; /* domain name */ - int qclass, qtype; /* class and type of query */ - u_char *answer; /* buffer to put answer */ - int anslen; /* size of answer buffer */ - int n; /* result length */ -}; - -static int str_isnumber(const char *); -static int explore_fqdn(const struct addrinfo *, const char *, - const char *, struct addrinfo **); -static int explore_null(const struct addrinfo *, - const char *, struct addrinfo **); -static int explore_numeric(const struct addrinfo *, const char *, - const char *, struct addrinfo **); -static int explore_numeric_scope(const struct addrinfo *, const char *, - const char *, struct addrinfo **); -static int get_canonname(const struct addrinfo *, - struct addrinfo *, const char *); -static struct addrinfo *get_ai(const struct addrinfo *, - const struct afd *, const char *); -static int get_portmatch(const struct addrinfo *, const char *); -static int get_port(struct addrinfo *, const char *, int); -static const struct afd *find_afd(int); -static int addrconfig(struct addrinfo *); -#ifdef INET6 -static int ip6_str2scopeid(char *, struct sockaddr_in6 *); -#endif - -static struct addrinfo *getanswer(const querybuf *, int, const char *, int, - const struct addrinfo *); -static int _dns_getaddrinfo(void *, void *, va_list); -static void _sethtent(void); -static void _endhtent(void); -static struct addrinfo *_gethtent(const char *, const struct addrinfo *); -static int _files_getaddrinfo(void *, void *, va_list); -#ifdef YP -static struct addrinfo *_yphostent(char *, const struct addrinfo *); -static int _yp_getaddrinfo(void *, void *, va_list); -extern int _yp_check(char **); -#endif - -u_int16_t _getshort(const u_char *src); - -static int res_queryN(const char *, struct res_target *); -static int res_searchN(const char *, struct res_target *); -static int res_querydomainN(const char *, const char *, - struct res_target *); - -static char *ai_errlist[] = { - "Success", - "Address family for hostname not supported", /* EAI_ADDRFAMILY */ - "Temporary failure in name resolution", /* EAI_AGAIN */ - "Invalid value for ai_flags", /* EAI_BADFLAGS */ - "Non-recoverable failure in name resolution", /* EAI_FAIL */ - "ai_family not supported", /* EAI_FAMILY */ - "Memory allocation failure", /* EAI_MEMORY */ - "No address associated with hostname", /* EAI_NODATA */ - "hostname nor servname provided, or not known", /* EAI_NONAME */ - "servname not supported for ai_socktype", /* EAI_SERVICE */ - "ai_socktype not supported", /* EAI_SOCKTYPE */ - "System error returned in errno", /* EAI_SYSTEM */ - "Invalid value for hints", /* EAI_BADHINTS */ - "Resolved protocol is unknown", /* EAI_PROTOCOL */ - "Unknown error", /* EAI_MAX */ -}; - -/* XXX macros that make external reference is BAD. */ - -#define GET_AI(ai, afd, addr) \ -do { \ - /* external reference: pai, error, and label free */ \ - (ai) = get_ai(pai, (afd), (addr)); \ - if ((ai) == NULL) { \ - error = EAI_MEMORY; \ - goto free; \ - } \ -} while (/*CONSTCOND*/0) - -#define GET_PORT(ai, serv) \ -do { \ - /* external reference: error and label free */ \ - error = get_port((ai), (serv), 0); \ - if (error != 0) \ - goto free; \ -} while (/*CONSTCOND*/0) - -#define GET_CANONNAME(ai, str) \ -do { \ - /* external reference: pai, error and label free */ \ - error = get_canonname(pai, (ai), (str)); \ - if (error != 0) \ - goto free; \ -} while (/*CONSTCOND*/0) - -#define ERR(err) \ -do { \ - /* external reference: error, and label bad */ \ - error = (err); \ - goto bad; \ - /*NOTREACHED*/ \ -} while (/*CONSTCOND*/0) - -#define MATCH_FAMILY(x, y, w) \ - ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC))) -#define MATCH(x, y, w) \ - ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY))) - -char * -gai_strerror(ecode) - int ecode; -{ - if (ecode < 0 || ecode > EAI_MAX) - ecode = EAI_MAX; - return ai_errlist[ecode]; -} - -void -freeaddrinfo(ai) - struct addrinfo *ai; -{ - struct addrinfo *next; - - do { - next = ai->ai_next; - if (ai->ai_canonname) - free(ai->ai_canonname); - /* no need to free(ai->ai_addr) */ - free(ai); - ai = next; - } while (ai); -} - -static int -str_isnumber(p) - const char *p; -{ - char *ep; - - if (*p == '\0') - return NO; - ep = NULL; - (void)strtoul(p, &ep, 10); - if (ep && *ep == '\0') - return YES; - else - return NO; -} - -int -getaddrinfo(hostname, servname, hints, res) - const char *hostname, *servname; - const struct addrinfo *hints; - struct addrinfo **res; -{ - struct addrinfo sentinel; - struct addrinfo *cur; - int error = 0; - struct addrinfo ai; - struct addrinfo ai0; - struct addrinfo *pai; - const struct explore *ex; - - memset(&sentinel, 0, sizeof(sentinel)); - cur = &sentinel; - pai = &ai; - pai->ai_flags = 0; - pai->ai_family = PF_UNSPEC; - pai->ai_socktype = ANY; - pai->ai_protocol = ANY; - pai->ai_addrlen = 0; - pai->ai_canonname = NULL; - pai->ai_addr = NULL; - pai->ai_next = NULL; - - if (hostname == NULL && servname == NULL) - return EAI_NONAME; - if (hints) { - /* error check for hints */ - if (hints->ai_addrlen || hints->ai_canonname || - hints->ai_addr || hints->ai_next) - ERR(EAI_BADHINTS); /* xxx */ - if (hints->ai_flags & ~AI_MASK) - ERR(EAI_BADFLAGS); - switch (hints->ai_family) { - case PF_UNSPEC: - case PF_INET: -#ifdef INET6 - case PF_INET6: -#endif - break; - default: - ERR(EAI_FAMILY); - } - memcpy(pai, hints, sizeof(*pai)); - - /* - * if both socktype/protocol are specified, check if they - * are meaningful combination. - */ - if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) { - for (ex = explore; ex->e_af >= 0; ex++) { - if (pai->ai_family != ex->e_af) - continue; - if (ex->e_socktype == ANY) - continue; - if (ex->e_protocol == ANY) - continue; - if (pai->ai_socktype == ex->e_socktype - && pai->ai_protocol != ex->e_protocol) { - ERR(EAI_BADHINTS); - } - } - } - } - - /* - * post-2553: AI_ALL and AI_V4MAPPED are effective only against - * AF_INET6 query. They needs to be ignored if specified in other - * occassions. - */ - switch (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) { - case AI_V4MAPPED: - case AI_ALL | AI_V4MAPPED: - if (pai->ai_family != AF_INET6) - pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED); - break; - case AI_ALL: -#if 1 - /* illegal */ - ERR(EAI_BADFLAGS); -#else - pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED); -#endif - break; - } - - /* - * check for special cases. (1) numeric servname is disallowed if - * socktype/protocol are left unspecified. (2) servname is disallowed - * for raw and other inet{,6} sockets. - */ - if (MATCH_FAMILY(pai->ai_family, PF_INET, 1) -#ifdef PF_INET6 - || MATCH_FAMILY(pai->ai_family, PF_INET6, 1) -#endif - ) { - ai0 = *pai; /* backup *pai */ - - if (pai->ai_family == PF_UNSPEC) { -#ifdef PF_INET6 - pai->ai_family = PF_INET6; -#else - pai->ai_family = PF_INET; -#endif - } - error = get_portmatch(pai, servname); - if (error) - ERR(error); - - *pai = ai0; - } - - ai0 = *pai; - - /* NULL hostname, or numeric hostname */ - for (ex = explore; ex->e_af >= 0; ex++) { - *pai = ai0; - - /* PF_UNSPEC entries are prepared for DNS queries only */ - if (ex->e_af == PF_UNSPEC) - continue; - - if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex))) - continue; - if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex))) - continue; - if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex))) - continue; - - if (pai->ai_family == PF_UNSPEC) - pai->ai_family = ex->e_af; - if (pai->ai_socktype == ANY && ex->e_socktype != ANY) - pai->ai_socktype = ex->e_socktype; - if (pai->ai_protocol == ANY && ex->e_protocol != ANY) - pai->ai_protocol = ex->e_protocol; - - if (hostname == NULL) - error = explore_null(pai, servname, &cur->ai_next); - else - error = explore_numeric_scope(pai, hostname, servname, &cur->ai_next); - - if (error) - goto free; - - while (cur && cur->ai_next) - cur = cur->ai_next; - } - - /* - * XXX - * If numreic representation of AF1 can be interpreted as FQDN - * representation of AF2, we need to think again about the code below. - */ - if (sentinel.ai_next) - goto good; - - if (pai->ai_flags & AI_NUMERICHOST) - ERR(EAI_NONAME); - if (hostname == NULL) - ERR(EAI_NODATA); - - if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0)) - ERR(EAI_FAIL); - - /* - * hostname as alphabetical name. - * we would like to prefer AF_INET6 than AF_INET, so we'll make a - * outer loop by AFs. - */ - for (ex = explore; ex->e_af >= 0; ex++) { - *pai = ai0; - - /* require exact match for family field */ - if (pai->ai_family != ex->e_af) - continue; - - if (!MATCH(pai->ai_socktype, ex->e_socktype, - WILD_SOCKTYPE(ex))) { - continue; - } - if (!MATCH(pai->ai_protocol, ex->e_protocol, - WILD_PROTOCOL(ex))) { - continue; - } - - if (pai->ai_socktype == ANY && ex->e_socktype != ANY) - pai->ai_socktype = ex->e_socktype; - if (pai->ai_protocol == ANY && ex->e_protocol != ANY) - pai->ai_protocol = ex->e_protocol; - - error = explore_fqdn(pai, hostname, servname, - &cur->ai_next); - - while (cur && cur->ai_next) - cur = cur->ai_next; - } - - /* XXX */ - if (sentinel.ai_next) - error = 0; - - if (error) - goto free; - if (error == 0) { - if (sentinel.ai_next) { - good: - *res = sentinel.ai_next; - return SUCCESS; - } else - error = EAI_FAIL; - } - free: - bad: - if (sentinel.ai_next) - freeaddrinfo(sentinel.ai_next); - *res = NULL; - return error; -} - -/* - * FQDN hostname, DNS lookup - */ -static int -explore_fqdn(pai, hostname, servname, res) - const struct addrinfo *pai; - const char *hostname; - const char *servname; - struct addrinfo **res; -{ - struct addrinfo *result; - struct addrinfo *cur; - int error = 0; - static const ns_dtab dtab[] = { - NS_FILES_CB(_files_getaddrinfo, NULL) - { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */ - NS_NIS_CB(_yp_getaddrinfo, NULL) - { 0 } - }; - - result = NULL; - - /* - * if the servname does not match socktype/protocol, ignore it. - */ - if (get_portmatch(pai, servname) != 0) - return 0; - - switch (nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo", - default_dns_files, hostname, pai)) { - case NS_TRYAGAIN: - error = EAI_AGAIN; - goto free; - case NS_UNAVAIL: - error = EAI_FAIL; - goto free; - case NS_NOTFOUND: - error = EAI_NODATA; - goto free; - case NS_SUCCESS: - error = 0; - for (cur = result; cur; cur = cur->ai_next) { - GET_PORT(cur, servname); - /* canonname should be filled already */ - } - break; - } - - *res = result; - - return 0; - -free: - if (result) - freeaddrinfo(result); - return error; -} - -/* - * hostname == NULL. - * passive socket -> anyaddr (0.0.0.0 or ::) - * non-passive socket -> localhost (127.0.0.1 or ::1) - */ -static int -explore_null(pai, servname, res) - const struct addrinfo *pai; - const char *servname; - struct addrinfo **res; -{ - int s; - const struct afd *afd; - struct addrinfo *cur; - struct addrinfo sentinel; - int error; - - *res = NULL; - sentinel.ai_next = NULL; - cur = &sentinel; - - /* - * filter out AFs that are not supported by the kernel - * XXX errno? - */ - s = socket(pai->ai_family, SOCK_DGRAM, 0); - if (s < 0) { - if (errno != EMFILE) - return 0; - } else - close(s); - - /* - * if the servname does not match socktype/protocol, ignore it. - */ - if (get_portmatch(pai, servname) != 0) - return 0; - - afd = find_afd(pai->ai_family); - if (afd == NULL) - return 0; - - if (pai->ai_flags & AI_PASSIVE) { - GET_AI(cur->ai_next, afd, afd->a_addrany); - /* xxx meaningless? - * GET_CANONNAME(cur->ai_next, "anyaddr"); - */ - GET_PORT(cur->ai_next, servname); - } else { - GET_AI(cur->ai_next, afd, afd->a_loopback); - /* xxx meaningless? - * GET_CANONNAME(cur->ai_next, "localhost"); - */ - GET_PORT(cur->ai_next, servname); - } - cur = cur->ai_next; - - *res = sentinel.ai_next; - return 0; - -free: - if (sentinel.ai_next) - freeaddrinfo(sentinel.ai_next); - return error; -} - -/* - * numeric hostname - */ -static int -explore_numeric(pai, hostname, servname, res) - const struct addrinfo *pai; - const char *hostname; - const char *servname; - struct addrinfo **res; -{ - const struct afd *afd; - struct addrinfo *cur; - struct addrinfo sentinel; - int error; - char pton[PTON_MAX]; - - *res = NULL; - sentinel.ai_next = NULL; - cur = &sentinel; - - /* - * if the servname does not match socktype/protocol, ignore it. - */ - if (get_portmatch(pai, servname) != 0) - return 0; - - afd = find_afd(pai->ai_family); - if (afd == NULL) - return 0; - - switch (afd->a_af) { -#if 1 /*X/Open spec*/ - case AF_INET: - if (inet_aton(hostname, (struct in_addr *)pton) == 1) { - if (pai->ai_family == afd->a_af || - pai->ai_family == PF_UNSPEC /*?*/) { - GET_AI(cur->ai_next, afd, pton); - GET_PORT(cur->ai_next, servname); - while (cur && cur->ai_next) - cur = cur->ai_next; - } else - ERR(EAI_FAMILY); /*xxx*/ - } - break; -#endif - default: - if (inet_pton(afd->a_af, hostname, pton) == 1) { - if (pai->ai_family == afd->a_af || - pai->ai_family == PF_UNSPEC /*?*/) { - GET_AI(cur->ai_next, afd, pton); - GET_PORT(cur->ai_next, servname); - while (cur && cur->ai_next) - cur = cur->ai_next; - } else - ERR(EAI_FAMILY); /*xxx*/ - } - break; - } - - *res = sentinel.ai_next; - return 0; - -free: -bad: - if (sentinel.ai_next) - freeaddrinfo(sentinel.ai_next); - return error; -} - -/* - * numeric hostname with scope - */ -static int -explore_numeric_scope(pai, hostname, servname, res) - const struct addrinfo *pai; - const char *hostname; - const char *servname; - struct addrinfo **res; -{ -#if !defined(SCOPE_DELIMITER) || !defined(INET6) - return explore_numeric(pai, hostname, servname, res); -#else - const struct afd *afd; - struct addrinfo *cur; - int error; - char *cp, *hostname2 = NULL, *scope, *addr; - struct sockaddr_in6 *sin6; - - /* - * if the servname does not match socktype/protocol, ignore it. - */ - if (get_portmatch(pai, servname) != 0) - return 0; - - afd = find_afd(pai->ai_family); - if (afd == NULL) - return 0; - - if (!afd->a_scoped) - return explore_numeric(pai, hostname, servname, res); - - cp = strchr(hostname, SCOPE_DELIMITER); - if (cp == NULL) - return explore_numeric(pai, hostname, servname, res); - - /* - * Handle special case of <scoped_address><delimiter><scope id> - */ - hostname2 = strdup(hostname); - if (hostname2 == NULL) - return EAI_MEMORY; - /* terminate at the delimiter */ - hostname2[cp - hostname] = '\0'; - addr = hostname2; - scope = cp + 1; - - error = explore_numeric(pai, addr, servname, res); - if (error == 0) { - int scopeid; - - for (cur = *res; cur; cur = cur->ai_next) { - if (cur->ai_family != AF_INET6) - continue; - sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr; - if ((scopeid = ip6_str2scopeid(scope, sin6)) == -1) { - free(hostname2); - return(EAI_NODATA); /* XXX: is return OK? */ - } - sin6->sin6_scope_id = scopeid; - } - } - - free(hostname2); - - return error; -#endif -} - -static int -get_canonname(pai, ai, str) - const struct addrinfo *pai; - struct addrinfo *ai; - const char *str; -{ - if ((pai->ai_flags & AI_CANONNAME) != 0) { - ai->ai_canonname = (char *)malloc(strlen(str) + 1); - if (ai->ai_canonname == NULL) - return EAI_MEMORY; - strcpy(ai->ai_canonname, str); - } - return 0; -} - -static struct addrinfo * -get_ai(pai, afd, addr) - const struct addrinfo *pai; - const struct afd *afd; - const char *addr; -{ - char *p; - struct addrinfo *ai; -#ifdef FAITH - struct in6_addr faith_prefix; - char *fp_str; - int translate = 0; -#endif - -#ifdef FAITH - /* - * Transfrom an IPv4 addr into a special IPv6 addr format for - * IPv6->IPv4 translation gateway. (only TCP is supported now) - * - * +-----------------------------------+------------+ - * | faith prefix part (12 bytes) | embedded | - * | | IPv4 addr part (4 bytes) - * +-----------------------------------+------------+ - * - * faith prefix part is specified as ascii IPv6 addr format - * in environmental variable GAI. - * For FAITH to work correctly, routing to faith prefix must be - * setup toward a machine where a FAITH daemon operates. - * Also, the machine must enable some mechanizm - * (e.g. faith interface hack) to divert those packet with - * faith prefixed destination addr to user-land FAITH daemon. - */ - fp_str = getenv("GAI"); - if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 && - afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) { - u_int32_t v4a; - u_int8_t v4a_top; - - memcpy(&v4a, addr, sizeof v4a); - v4a_top = v4a >> IN_CLASSA_NSHIFT; - if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) && - v4a_top != 0 && v4a != IN_LOOPBACKNET) { - afd = &afdl[N_INET6]; - memcpy(&faith_prefix.s6_addr[12], addr, - sizeof(struct in_addr)); - translate = 1; - } - } -#endif - - ai = (struct addrinfo *)malloc(sizeof(struct addrinfo) - + (afd->a_socklen)); - if (ai == NULL) - return NULL; - - memcpy(ai, pai, sizeof(struct addrinfo)); - ai->ai_addr = (struct sockaddr *)(void *)(ai + 1); - memset(ai->ai_addr, 0, (size_t)afd->a_socklen); - ai->ai_addrlen = afd->a_socklen; - ai->ai_addr->sa_family = ai->ai_family = afd->a_af; - p = (char *)(void *)(ai->ai_addr); -#ifdef FAITH - if (translate == 1) - memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen); - else -#endif - memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen); - return ai; -} - -static int -get_portmatch(ai, servname) - const struct addrinfo *ai; - const char *servname; -{ - - /* get_port does not touch first argument. when matchonly == 1. */ - /* LINTED const cast */ - return get_port((struct addrinfo *)ai, servname, 1); -} - -static int -get_port(ai, servname, matchonly) - struct addrinfo *ai; - const char *servname; - int matchonly; -{ - const char *proto; - struct servent *sp; - int port; - int allownumeric; - - if (servname == NULL) - return 0; - switch (ai->ai_family) { - case AF_INET: -#ifdef AF_INET6 - case AF_INET6: -#endif - break; - default: - return 0; - } - - switch (ai->ai_socktype) { - case SOCK_RAW: - return EAI_SERVICE; - case SOCK_DGRAM: - case SOCK_STREAM: - allownumeric = 1; - break; - case ANY: - allownumeric = 0; - break; - default: - return EAI_SOCKTYPE; - } - - if (str_isnumber(servname)) { - if (!allownumeric) - return EAI_SERVICE; - port = htons(atoi(servname)); - if (port < 0 || port > 65535) - return EAI_SERVICE; - } else { - switch (ai->ai_socktype) { - case SOCK_DGRAM: - proto = "udp"; - break; - case SOCK_STREAM: - proto = "tcp"; - break; - default: - proto = NULL; - break; - } - - if ((sp = getservbyname(servname, proto)) == NULL) - return EAI_SERVICE; - port = sp->s_port; - } - - if (!matchonly) { - switch (ai->ai_family) { - case AF_INET: - ((struct sockaddr_in *)(void *) - ai->ai_addr)->sin_port = port; - break; -#ifdef INET6 - case AF_INET6: - ((struct sockaddr_in6 *)(void *) - ai->ai_addr)->sin6_port = port; - break; -#endif - } - } - - return 0; -} - -static const struct afd * -find_afd(af) - int af; -{ - const struct afd *afd; - - if (af == PF_UNSPEC) - return NULL; - for (afd = afdl; afd->a_af; afd++) { - if (afd->a_af == af) - return afd; - } - return NULL; -} - -/* - * post-2553: AI_ADDRCONFIG check. if we use getipnodeby* as backend, backend - * will take care of it. - * the semantics of AI_ADDRCONFIG is not defined well. we are not sure - * if the code is right or not. - * - * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with - * _dns_getaddrinfo. - */ -static int -addrconfig(pai) - struct addrinfo *pai; -{ - int s, af; - - /* - * TODO: - * Note that implementation dependent test for address - * configuration should be done everytime called - * (or apropriate interval), - * because addresses will be dynamically assigned or deleted. - */ - af = pai->ai_family; - if (af == AF_UNSPEC) { - if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) - af = AF_INET; - else { - close(s); - if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) - af = AF_INET6; - else - close(s); - } - } - if (af != AF_UNSPEC) { - if ((s = socket(af, SOCK_DGRAM, 0)) < 0) - return 0; - close(s); - } - pai->ai_family = af; - return 1; -} - -#ifdef INET6 -/* convert a string to a scope identifier. XXX: IPv6 specific */ -static int -ip6_str2scopeid(scope, sin6) - char *scope; - struct sockaddr_in6 *sin6; -{ - int scopeid; - struct in6_addr *a6 = &sin6->sin6_addr; - char *ep; - - /* empty scopeid portion is invalid */ - if (*scope == '\0') - return -1; - - if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) { - /* - * We currently assume a one-to-one mapping between links - * and interfaces, so we simply use interface indices for - * like-local scopes. - */ - scopeid = if_nametoindex(scope); - if (scopeid == 0) - goto trynumeric; - return(scopeid); - } - - /* still unclear about literal, allow numeric only - placeholder */ - if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6)) - goto trynumeric; - if (IN6_IS_ADDR_MC_ORGLOCAL(a6)) - goto trynumeric; - else - goto trynumeric; /* global */ - - /* try to convert to a numeric id as a last resort */ - trynumeric: - scopeid = (int)strtoul(scope, &ep, 10); - if (*ep == '\0') - return scopeid; - else - return -1; -} -#endif - -#ifdef DEBUG -static const char AskedForGot[] = - "gethostby*.getanswer: asked for \"%s\", got \"%s\""; -#endif -static FILE *hostf = NULL; - -static struct addrinfo * -getanswer(answer, anslen, qname, qtype, pai) - const querybuf *answer; - int anslen; - const char *qname; - int qtype; - const struct addrinfo *pai; -{ - struct addrinfo sentinel, *cur; - struct addrinfo ai; - const struct afd *afd; - char *canonname; - const HEADER *hp; - const u_char *cp; - int n; - const u_char *eom; - char *bp; - int type, class, buflen, ancount, qdcount; - int haveanswer, had_error; - char tbuf[MAXDNAME]; - int (*name_ok)(const char *); - char hostbuf[8*1024]; - - memset(&sentinel, 0, sizeof(sentinel)); - cur = &sentinel; - - canonname = NULL; - eom = answer->buf + anslen; - switch (qtype) { - case T_A: - case T_AAAA: - case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/ - name_ok = res_hnok; - break; - default: - return (NULL); /* XXX should be abort(); */ - } - /* - * find first satisfactory answer - */ - hp = &answer->hdr; - ancount = ntohs(hp->ancount); - qdcount = ntohs(hp->qdcount); - bp = hostbuf; - buflen = sizeof hostbuf; - cp = answer->buf + HFIXEDSZ; - if (qdcount != 1) { - h_errno = NO_RECOVERY; - return (NULL); - } - n = dn_expand(answer->buf, eom, cp, bp, buflen); - if ((n < 0) || !(*name_ok)(bp)) { - h_errno = NO_RECOVERY; - return (NULL); - } - cp += n + QFIXEDSZ; - if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) { - /* res_send() has already verified that the query name is the - * same as the one we sent; this just gets the expanded name - * (i.e., with the succeeding search-domain tacked on). - */ - n = strlen(bp) + 1; /* for the \0 */ - if (n >= MAXHOSTNAMELEN) { - h_errno = NO_RECOVERY; - return (NULL); - } - canonname = bp; - bp += n; - buflen -= n; - /* The qname can be abbreviated, but h_name is now absolute. */ - qname = canonname; - } - haveanswer = 0; - had_error = 0; - while (ancount-- > 0 && cp < eom && !had_error) { - n = dn_expand(answer->buf, eom, cp, bp, buflen); - if ((n < 0) || !(*name_ok)(bp)) { - had_error++; - continue; - } - cp += n; /* name */ - type = _getshort(cp); - cp += INT16SZ; /* type */ - class = _getshort(cp); - cp += INT16SZ + INT32SZ; /* class, TTL */ - n = _getshort(cp); - cp += INT16SZ; /* len */ - if (class != C_IN) { - /* XXX - debug? syslog? */ - cp += n; - continue; /* XXX - had_error++ ? */ - } - if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) && - type == T_CNAME) { - n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); - if ((n < 0) || !(*name_ok)(tbuf)) { - had_error++; - continue; - } - cp += n; - /* Get canonical name. */ - n = strlen(tbuf) + 1; /* for the \0 */ - if (n > buflen || n >= MAXHOSTNAMELEN) { - had_error++; - continue; - } - strcpy(bp, tbuf); - canonname = bp; - bp += n; - buflen -= n; - continue; - } - if (qtype == T_ANY) { - if (!(type == T_A || type == T_AAAA)) { - cp += n; - continue; - } - } else if (type != qtype) { -#ifdef DEBUG - if (type != T_KEY && type != T_SIG) - syslog(LOG_NOTICE|LOG_AUTH, - "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", - qname, p_class(C_IN), p_type(qtype), - p_type(type)); -#endif - cp += n; - continue; /* XXX - had_error++ ? */ - } - switch (type) { - case T_A: - case T_AAAA: - if (strcasecmp(canonname, bp) != 0) { -#ifdef DEBUG - syslog(LOG_NOTICE|LOG_AUTH, - AskedForGot, canonname, bp); -#endif - cp += n; - continue; /* XXX - had_error++ ? */ - } - if (type == T_A && n != INADDRSZ) { - cp += n; - continue; - } - if (type == T_AAAA && n != IN6ADDRSZ) { - cp += n; - continue; - } -#ifdef FILTER_V4MAPPED - if (type == T_AAAA) { - struct in6_addr in6; - memcpy(&in6, cp, sizeof(in6)); - if (IN6_IS_ADDR_V4MAPPED(&in6)) { - cp += n; - continue; - } - } -#endif - if (!haveanswer) { - int nn; - - canonname = bp; - nn = strlen(bp) + 1; /* for the \0 */ - bp += nn; - buflen -= nn; - } - - /* don't overwrite pai */ - ai = *pai; - ai.ai_family = (type == T_A) ? AF_INET : AF_INET6; - afd = find_afd(ai.ai_family); - if (afd == NULL) { - cp += n; - continue; - } - cur->ai_next = get_ai(&ai, afd, (const char *)cp); - if (cur->ai_next == NULL) - had_error++; - while (cur && cur->ai_next) - cur = cur->ai_next; - cp += n; - break; - default: - abort(); - } - if (!had_error) - haveanswer++; - } - if (haveanswer) { - if (!canonname) - (void)get_canonname(pai, sentinel.ai_next, qname); - else - (void)get_canonname(pai, sentinel.ai_next, canonname); - h_errno = NETDB_SUCCESS; - return sentinel.ai_next; - } - - h_errno = NO_RECOVERY; - return NULL; -} - -/*ARGSUSED*/ -static int -_dns_getaddrinfo(rv, cb_data, ap) - void *rv; - void *cb_data; - va_list ap; -{ - struct addrinfo *ai; - querybuf buf, buf2; - const char *name; - const struct addrinfo *pai; - struct addrinfo sentinel, *cur; - struct res_target q, q2; - - name = va_arg(ap, char *); - pai = va_arg(ap, const struct addrinfo *); - - memset(&q, 0, sizeof(q2)); - memset(&q2, 0, sizeof(q2)); - memset(&sentinel, 0, sizeof(sentinel)); - cur = &sentinel; - - switch (pai->ai_family) { - case AF_UNSPEC: - /* prefer IPv6 */ - q.qclass = C_IN; - q.qtype = T_AAAA; - q.answer = buf.buf; - q.anslen = sizeof(buf); - q.next = &q2; - q2.qclass = C_IN; - q2.qtype = T_A; - q2.answer = buf2.buf; - q2.anslen = sizeof(buf2); - break; - case AF_INET: - q.qclass = C_IN; - q.qtype = T_A; - q.answer = buf.buf; - q.anslen = sizeof(buf); - break; - case AF_INET6: - q.qclass = C_IN; - q.qtype = T_AAAA; - q.answer = buf.buf; - q.anslen = sizeof(buf); - break; - default: - return NS_UNAVAIL; - } - if (res_searchN(name, &q) < 0) - return NS_NOTFOUND; - ai = getanswer(&buf, q.n, q.name, q.qtype, pai); - if (ai) { - cur->ai_next = ai; - while (cur && cur->ai_next) - cur = cur->ai_next; - } - if (q.next) { - ai = getanswer(&buf2, q2.n, q2.name, q2.qtype, pai); - if (ai) - cur->ai_next = ai; - } - if (sentinel.ai_next == NULL) - switch (h_errno) { - case HOST_NOT_FOUND: - return NS_NOTFOUND; - case TRY_AGAIN: - return NS_TRYAGAIN; - default: - return NS_UNAVAIL; - } - *((struct addrinfo **)rv) = sentinel.ai_next; - return NS_SUCCESS; -} - -static void -_sethtent() -{ - if (!hostf) - hostf = fopen(_PATH_HOSTS, "r" ); - else - rewind(hostf); -} - -static void -_endhtent() -{ - if (hostf) { - (void) fclose(hostf); - hostf = NULL; - } -} - -static struct addrinfo * -_gethtent(name, pai) - const char *name; - const struct addrinfo *pai; -{ - char *p; - char *cp, *tname, *cname; - struct addrinfo hints, *res0, *res; - int error; - const char *addr; - char hostbuf[8*1024]; - - if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) - return (NULL); - again: - if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) - return (NULL); - if (*p == '#') - goto again; - if (!(cp = strpbrk(p, "#\n"))) - goto again; - *cp = '\0'; - if (!(cp = strpbrk(p, " \t"))) - goto again; - *cp++ = '\0'; - addr = p; - cname = NULL; - /* if this is not something we're looking for, skip it. */ - while (cp && *cp) { - if (*cp == ' ' || *cp == '\t') { - cp++; - continue; - } - tname = cp; - if (cname == NULL) - cname = cp; - if ((cp = strpbrk(cp, " \t")) != NULL) - *cp++ = '\0'; - if (strcasecmp(name, tname) == 0) - goto found; - } - goto again; - -found: - hints = *pai; - hints.ai_flags = AI_NUMERICHOST; - error = getaddrinfo(addr, NULL, &hints, &res0); - if (error) - goto again; -#ifdef FILTER_V4MAPPED - /* XXX should check all items in the chain */ - if (res0->ai_family == AF_INET6 && - IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) { - freeaddrinfo(res0); - goto again; - } -#endif - for (res = res0; res; res = res->ai_next) { - /* cover it up */ - res->ai_flags = pai->ai_flags; - - if (pai->ai_flags & AI_CANONNAME) { - if (get_canonname(pai, res, cname) != 0) { - freeaddrinfo(res0); - goto again; - } - } - } - return res0; -} - -/*ARGSUSED*/ -static int -_files_getaddrinfo(rv, cb_data, ap) - void *rv; - void *cb_data; - va_list ap; -{ - const char *name; - const struct addrinfo *pai; - struct addrinfo sentinel, *cur; - struct addrinfo *p; - - name = va_arg(ap, char *); - pai = va_arg(ap, struct addrinfo *); - - memset(&sentinel, 0, sizeof(sentinel)); - cur = &sentinel; - - _sethtent(); - while ((p = _gethtent(name, pai)) != NULL) { - cur->ai_next = p; - while (cur && cur->ai_next) - cur = cur->ai_next; - } - _endhtent(); - - *((struct addrinfo **)rv) = sentinel.ai_next; - if (sentinel.ai_next == NULL) - return NS_NOTFOUND; - return NS_SUCCESS; -} - -#ifdef YP -static char *__ypdomain; - -/*ARGSUSED*/ -static struct addrinfo * -_yphostent(line, pai) - char *line; - const struct addrinfo *pai; -{ - struct addrinfo sentinel, *cur; - struct addrinfo hints, *res, *res0; - int error; - char *p = line; - const char *addr, *canonname; - char *nextline; - char *cp; - - addr = canonname = NULL; - - memset(&sentinel, 0, sizeof(sentinel)); - cur = &sentinel; - -nextline: - /* terminate line */ - cp = strchr(p, '\n'); - if (cp) { - *cp++ = '\0'; - nextline = cp; - } else - nextline = NULL; - - cp = strpbrk(p, " \t"); - if (cp == NULL) { - if (canonname == NULL) - return (NULL); - else - goto done; - } - *cp++ = '\0'; - - addr = p; - - while (cp && *cp) { - if (*cp == ' ' || *cp == '\t') { - cp++; - continue; - } - if (!canonname) - canonname = cp; - if ((cp = strpbrk(cp, " \t")) != NULL) - *cp++ = '\0'; - } - - hints = *pai; - hints.ai_flags = AI_NUMERICHOST; - error = getaddrinfo(addr, NULL, &hints, &res0); - if (error == 0) { - for (res = res0; res; res = res->ai_next) { - /* cover it up */ - res->ai_flags = pai->ai_flags; - - if (pai->ai_flags & AI_CANONNAME) - (void)get_canonname(pai, res, canonname); - } - } else - res0 = NULL; - if (res0) { - cur->ai_next = res0; - while (cur && cur->ai_next) - cur = cur->ai_next; - } - - if (nextline) { - p = nextline; - goto nextline; - } - -done: - return sentinel.ai_next; -} - -/*ARGSUSED*/ -static int -_yp_getaddrinfo(rv, cb_data, ap) - void *rv; - void *cb_data; - va_list ap; -{ - struct addrinfo sentinel, *cur; - struct addrinfo *ai = NULL; - static char *__ypcurrent; - int __ypcurrentlen, r; - const char *name; - const struct addrinfo *pai; - - name = va_arg(ap, char *); - pai = va_arg(ap, const struct addrinfo *); - - memset(&sentinel, 0, sizeof(sentinel)); - cur = &sentinel; - - if (!__ypdomain) { - if (_yp_check(&__ypdomain) == 0) - return NS_UNAVAIL; - } - if (__ypcurrent) - free(__ypcurrent); - __ypcurrent = NULL; - - /* hosts.byname is only for IPv4 (Solaris8) */ - if (pai->ai_family == PF_UNSPEC || pai->ai_family == PF_INET) { - r = yp_match(__ypdomain, "hosts.byname", name, - (int)strlen(name), &__ypcurrent, &__ypcurrentlen); - if (r == 0) { - struct addrinfo ai4; - - ai4 = *pai; - ai4.ai_family = AF_INET; - ai = _yphostent(__ypcurrent, &ai4); - if (ai) { - cur->ai_next = ai; - while (cur && cur->ai_next) - cur = cur->ai_next; - } - } - } - - /* ipnodes.byname can hold both IPv4/v6 */ - r = yp_match(__ypdomain, "ipnodes.byname", name, - (int)strlen(name), &__ypcurrent, &__ypcurrentlen); - if (r == 0) { - ai = _yphostent(__ypcurrent, pai); - if (ai) { - cur->ai_next = ai; - while (cur && cur->ai_next) - cur = cur->ai_next; - } - } - - if (sentinel.ai_next == NULL) { - h_errno = HOST_NOT_FOUND; - return NS_NOTFOUND; - } - *((struct addrinfo **)rv) = sentinel.ai_next; - return NS_SUCCESS; -} -#endif - -/* resolver logic */ - -extern const char *__hostalias(const char *); -extern int h_errno; - -/* - * Formulate a normal query, send, and await answer. - * Returned answer is placed in supplied buffer "answer". - * Perform preliminary check of answer, returning success only - * if no error is indicated and the answer count is nonzero. - * Return the size of the response on success, -1 on error. - * Error number is left in h_errno. - * - * Caller must parse answer and determine whether it answers the question. - */ -static int -res_queryN(name, target) - const char *name; /* domain name */ - struct res_target *target; -{ - u_char buf[MAXPACKET]; - HEADER *hp; - int n; - struct res_target *t; - int rcode; - int ancount; - - rcode = NOERROR; - ancount = 0; - - if ((_res.options & RES_INIT) == 0 && res_init() == -1) { - h_errno = NETDB_INTERNAL; - return (-1); - } - - for (t = target; t; t = t->next) { - int class, type; - u_char *answer; - int anslen; - - hp = (HEADER *)(void *)t->answer; - hp->rcode = NOERROR; /* default */ - - /* make it easier... */ - class = t->qclass; - type = t->qtype; - answer = t->answer; - anslen = t->anslen; -#ifdef DEBUG - if (_res.options & RES_DEBUG) - printf(";; res_query(%s, %d, %d)\n", name, class, type); -#endif - - n = res_mkquery(QUERY, name, class, type, NULL, 0, NULL, - buf, sizeof(buf)); - if (n > 0 && (_res.options & RES_USE_EDNS0) != 0) - n = res_opt(n, buf, sizeof(buf), anslen); - if (n <= 0) { -#ifdef DEBUG - if (_res.options & RES_DEBUG) - printf(";; res_query: mkquery failed\n"); -#endif - h_errno = NO_RECOVERY; - return (n); - } - n = res_send(buf, n, answer, anslen); -#if 0 - if (n < 0) { -#ifdef DEBUG - if (_res.options & RES_DEBUG) - printf(";; res_query: send error\n"); -#endif - h_errno = TRY_AGAIN; - return (n); - } -#endif - - if (n < 0 || hp->rcode != NOERROR || ntohs(hp->ancount) == 0) { - rcode = hp->rcode; /* record most recent error */ -#ifdef DEBUG - if (_res.options & RES_DEBUG) - printf(";; rcode = %d, ancount=%d\n", hp->rcode, - ntohs(hp->ancount)); -#endif - continue; - } - - ancount += ntohs(hp->ancount); - - t->n = n; - } - - if (ancount == 0) { - switch (rcode) { - case NXDOMAIN: - h_errno = HOST_NOT_FOUND; - break; - case SERVFAIL: - h_errno = TRY_AGAIN; - break; - case NOERROR: - h_errno = NO_DATA; - break; - case FORMERR: - case NOTIMP: - case REFUSED: - default: - h_errno = NO_RECOVERY; - break; - } - return (-1); - } - return (ancount); -} - -/* - * Formulate a normal query, send, and retrieve answer in supplied buffer. - * Return the size of the response on success, -1 on error. - * If enabled, implement search rules until answer or unrecoverable failure - * is detected. Error code, if any, is left in h_errno. - */ -static int -res_searchN(name, target) - const char *name; /* domain name */ - struct res_target *target; -{ - const char *cp, * const *domain; - HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/ - u_int dots; - int trailing_dot, ret, saved_herrno; - int got_nodata = 0, got_servfail = 0, tried_as_is = 0; - - if ((_res.options & RES_INIT) == 0 && res_init() == -1) { - h_errno = NETDB_INTERNAL; - return (-1); - } - - errno = 0; - h_errno = HOST_NOT_FOUND; /* default, if we never query */ - dots = 0; - for (cp = name; *cp; cp++) - dots += (*cp == '.'); - trailing_dot = 0; - if (cp > name && *--cp == '.') - trailing_dot++; - - /* - * if there aren't any dots, it could be a user-level alias - */ - if (!dots && (cp = __hostalias(name)) != NULL) - return (res_queryN(cp, target)); - - /* - * If there are dots in the name already, let's just give it a try - * 'as is'. The threshold can be set with the "ndots" option. - */ - saved_herrno = -1; - if (dots >= _res.ndots) { - ret = res_querydomainN(name, NULL, target); - if (ret > 0) - return (ret); - saved_herrno = h_errno; - tried_as_is++; - } - - /* - * We do at least one level of search if - * - there is no dot and RES_DEFNAME is set, or - * - there is at least one dot, there is no trailing dot, - * and RES_DNSRCH is set. - */ - if ((!dots && (_res.options & RES_DEFNAMES)) || - (dots && !trailing_dot && (_res.options & RES_DNSRCH))) { - int done = 0; - - for (domain = (const char * const *)_res.dnsrch; - *domain && !done; - domain++) { - - ret = res_querydomainN(name, *domain, target); - if (ret > 0) - return (ret); - - /* - * If no server present, give up. - * If name isn't found in this domain, - * keep trying higher domains in the search list - * (if that's enabled). - * On a NO_DATA error, keep trying, otherwise - * a wildcard entry of another type could keep us - * from finding this entry higher in the domain. - * If we get some other error (negative answer or - * server failure), then stop searching up, - * but try the input name below in case it's - * fully-qualified. - */ - if (errno == ECONNREFUSED) { - h_errno = TRY_AGAIN; - return (-1); - } - - switch (h_errno) { - case NO_DATA: - got_nodata++; - /* FALLTHROUGH */ - case HOST_NOT_FOUND: - /* keep trying */ - break; - case TRY_AGAIN: - if (hp->rcode == SERVFAIL) { - /* try next search element, if any */ - got_servfail++; - break; - } - /* FALLTHROUGH */ - default: - /* anything else implies that we're done */ - done++; - } - /* - * if we got here for some reason other than DNSRCH, - * we only wanted one iteration of the loop, so stop. - */ - if (!(_res.options & RES_DNSRCH)) - done++; - } - } - - /* - * if we have not already tried the name "as is", do that now. - * note that we do this regardless of how many dots were in the - * name or whether it ends with a dot. - */ - if (!tried_as_is && (dots || !(_res.options & RES_NOTLDQUERY))) { - ret = res_querydomainN(name, NULL, target); - if (ret > 0) - return (ret); - } - - /* - * if we got here, we didn't satisfy the search. - * if we did an initial full query, return that query's h_errno - * (note that we wouldn't be here if that query had succeeded). - * else if we ever got a nodata, send that back as the reason. - * else send back meaningless h_errno, that being the one from - * the last DNSRCH we did. - */ - if (saved_herrno != -1) - h_errno = saved_herrno; - else if (got_nodata) - h_errno = NO_DATA; - else if (got_servfail) - h_errno = TRY_AGAIN; - return (-1); -} - -/* - * Perform a call on res_query on the concatenation of name and domain, - * removing a trailing dot from name if domain is NULL. - */ -static int -res_querydomainN(name, domain, target) - const char *name, *domain; - struct res_target *target; -{ - char nbuf[MAXDNAME]; - const char *longname = nbuf; - size_t n, d; - - if ((_res.options & RES_INIT) == 0 && res_init() == -1) { - h_errno = NETDB_INTERNAL; - return (-1); - } -#ifdef DEBUG - if (_res.options & RES_DEBUG) - printf(";; res_querydomain(%s, %s)\n", - name, domain?domain:"<Nil>"); -#endif - if (domain == NULL) { - /* - * Check for trailing '.'; - * copy without '.' if present. - */ - n = strlen(name); - if (n >= MAXDNAME) { - h_errno = NO_RECOVERY; - return (-1); - } - if (n > 0 && name[--n] == '.') { - strncpy(nbuf, name, n); - nbuf[n] = '\0'; - } else - longname = name; - } else { - n = strlen(name); - d = strlen(domain); - if (n + d + 1 >= MAXDNAME) { - h_errno = NO_RECOVERY; - return (-1); - } - sprintf(nbuf, "%s.%s", name, domain); - } - return (res_queryN(longname, target)); -} |