diff options
Diffstat (limited to 'libc/netbsd/net/getaddrinfo.c')
| -rw-r--r-- | libc/netbsd/net/getaddrinfo.c | 1792 |
1 files changed, 0 insertions, 1792 deletions
diff --git a/libc/netbsd/net/getaddrinfo.c b/libc/netbsd/net/getaddrinfo.c deleted file mode 100644 index 2dd3d97..0000000 --- a/libc/netbsd/net/getaddrinfo.c +++ /dev/null @@ -1,1792 +0,0 @@ -/* $NetBSD: getaddrinfo.c,v 1.82 2006/03/25 12:09:40 rpaulo Exp $ */ -/* $KAME: getaddrinfo.c,v 1.29 2000/08/31 17:26:57 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. - */ - -/* - * 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. - * - IPv4 classful (shortened) form. RFC2553 is silent about it. XNET 5.2 - * says to use inet_aton() to convert IPv4 numeric to binary (alows - * classful form as a result). - * current code - disallow classful form for IPv4 (due to use of inet_pton). - * - 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. - */ - -#include <sys/cdefs.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 <assert.h> -#include <ctype.h> -#include <errno.h> -#include <netdb.h> -#include "resolv_private.h" -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - -#include <syslog.h> -#include <stdarg.h> -#include "nsswitch.h" - -#define SUCCESS 0 -#define ANY 0 -#define YES 1 -#define NO 0 - -static const char in_addrany[] = { 0, 0, 0, 0 }; -static const char in_loopback[] = { 127, 0, 0, 1 }; -#ifdef INET6 -static const char in6_addrany[] = { - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 -}; -static const char in6_loopback[] = { - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 -}; -#endif - -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 - {PF_INET6, sizeof(struct in6_addr), - sizeof(struct sockaddr_in6), - offsetof(struct sockaddr_in6, sin6_addr), - in6_addrany, in6_loopback, 1}, -#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, 0 } -}; - -#define MAXPACKET (64*1024) - -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 str2number(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 **, const char *); -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(const struct addrinfo *, const char *, int); -static const struct afd *find_afd(int); -#ifdef INET6 -static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *); -#endif - -static struct addrinfo *getanswer(const querybuf *, int, const char *, int, - const struct addrinfo *); -static void aisort(struct addrinfo *s, res_state res); -static int _dns_getaddrinfo(void *, void *, va_list); -static void _sethtent(FILE **); -static void _endhtent(FILE **); -static struct addrinfo *_gethtent(FILE **, const char *, - const struct addrinfo *); -static int _files_getaddrinfo(void *, void *, va_list); - -static int res_queryN(const char *, struct res_target *, res_state); -static int res_searchN(const char *, struct res_target *, res_state); -static int res_querydomainN(const char *, const char *, - struct res_target *, res_state); - -static const char * const 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 */ - "Argument buffer overflow", /* EAI_OVERFLOW */ - "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))) - -const char * -gai_strerror(int ecode) -{ - if (ecode < 0 || ecode > EAI_MAX) - ecode = EAI_MAX; - return ai_errlist[ecode]; -} - -void -freeaddrinfo(struct addrinfo *ai) -{ - struct addrinfo *next; - - assert(ai != NULL); - - 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 -str2number(const char *p) -{ - char *ep; - unsigned long v; - - assert(p != NULL); - - if (*p == '\0') - return -1; - ep = NULL; - errno = 0; - v = strtoul(p, &ep, 10); - if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) - return v; - else - return -1; -} - -int -getaddrinfo(const char *hostname, const char *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; - - /* hostname is allowed to be NULL */ - /* servname is allowed to be NULL */ - /* hints is allowed to be NULL */ - assert(res != NULL); - - 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); - } - } - } - } - - /* - * 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->ai_next) - cur = cur->ai_next; - } - - /* - * XXX - * If numeric 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 (hostname == NULL) - ERR(EAI_NODATA); - if (pai->ai_flags & AI_NUMERICHOST) - ERR(EAI_NONAME); - - /* - * 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(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, 0, 0 } - }; - - assert(pai != NULL); - /* hostname may be NULL */ - /* servname may be NULL */ - assert(res != NULL); - - 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(const struct addrinfo *pai, const char *servname, - struct addrinfo **res) -{ - int s; - const struct afd *afd; - struct addrinfo *cur; - struct addrinfo sentinel; - int error; - - assert(pai != NULL); - /* servname may be NULL */ - assert(res != NULL); - - *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(const struct addrinfo *pai, const char *hostname, - const char *servname, struct addrinfo **res, const char *canonname) -{ - const struct afd *afd; - struct addrinfo *cur; - struct addrinfo sentinel; - int error; - char pton[PTON_MAX]; - - assert(pai != NULL); - /* hostname may be NULL */ - /* servname may be NULL */ - assert(res != NULL); - - *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 0 /*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); - if ((pai->ai_flags & AI_CANONNAME)) { - /* - * Set the numeric address itself as - * the canonical name, based on a - * clarification in rfc2553bis-03. - */ - GET_CANONNAME(cur->ai_next, canonname); - } - 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); - if ((pai->ai_flags & AI_CANONNAME)) { - /* - * Set the numeric address itself as - * the canonical name, based on a - * clarification in rfc2553bis-03. - */ - GET_CANONNAME(cur->ai_next, canonname); - } - while (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(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, hostname); -#else - const struct afd *afd; - struct addrinfo *cur; - int error; - char *cp, *hostname2 = NULL, *scope, *addr; - struct sockaddr_in6 *sin6; - - assert(pai != NULL); - /* hostname may be NULL */ - /* servname may be NULL */ - assert(res != NULL); - - /* - * 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, hostname); - - cp = strchr(hostname, SCOPE_DELIMITER); - if (cp == NULL) - return explore_numeric(pai, hostname, servname, res, hostname); - - /* - * 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, hostname); - if (error == 0) { - u_int32_t 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 (ip6_str2scopeid(scope, sin6, &scopeid) == -1) { - free(hostname2); - return(EAI_NODATA); /* XXX: is return OK? */ - } - sin6->sin6_scope_id = scopeid; - } - } - - free(hostname2); - - return error; -#endif -} - -static int -get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str) -{ - - assert(pai != NULL); - assert(ai != NULL); - assert(str != NULL); - - if ((pai->ai_flags & AI_CANONNAME) != 0) { - ai->ai_canonname = strdup(str); - if (ai->ai_canonname == NULL) - return EAI_MEMORY; - } - return 0; -} - -static struct addrinfo * -get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr) -{ - char *p; - struct addrinfo *ai; - - assert(pai != NULL); - assert(afd != NULL); - assert(addr != NULL); - - 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); - -#ifdef HAVE_SA_LEN - ai->ai_addr->sa_len = afd->a_socklen; -#endif - - ai->ai_addrlen = afd->a_socklen; -#if defined (__alpha__) || (defined(__i386__) && defined(_LP64)) || defined(__sparc64__) - ai->__ai_pad0 = 0; -#endif - ai->ai_addr->sa_family = ai->ai_family = afd->a_af; - p = (char *)(void *)(ai->ai_addr); - memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen); - return ai; -} - -static int -get_portmatch(const struct addrinfo *ai, const char *servname) -{ - - assert(ai != NULL); - /* servname may be NULL */ - - return get_port(ai, servname, 1); -} - -static int -get_port(const struct addrinfo *ai, const char *servname, int matchonly) -{ - const char *proto; - struct servent *sp; - int port; - int allownumeric; - - assert(ai != NULL); - /* servname may be NULL */ - - 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; - } - - port = str2number(servname); - if (port >= 0) { - if (!allownumeric) - return EAI_SERVICE; - if (port < 0 || port > 65535) - return EAI_SERVICE; - port = htons(port); - } else { - if (ai->ai_flags & AI_NUMERICSERV) - return EAI_NONAME; - - 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(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; -} - -#ifdef INET6 -/* convert a string to a scope identifier. XXX: IPv6 specific */ -static int -ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid) -{ - u_long lscopeid; - struct in6_addr *a6; - char *ep; - - assert(scope != NULL); - assert(sin6 != NULL); - assert(scopeid != NULL); - - a6 = &sin6->sin6_addr; - - /* 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 0; - } - - /* 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: - errno = 0; - lscopeid = strtoul(scope, &ep, 10); - *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL); - if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid) - return 0; - else - return -1; -} -#endif - -/* code duplicate with gethnamaddr.c */ - -static const char AskedForGot[] = - "gethostby*.getanswer: asked for \"%s\", got \"%s\""; - -static struct addrinfo * -getanswer(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, *ep; - int type, class, ancount, qdcount; - int haveanswer, had_error; - char tbuf[MAXDNAME]; - int (*name_ok) (const char *); - char hostbuf[8*1024]; - - assert(answer != NULL); - assert(qname != NULL); - assert(pai != NULL); - - 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; - ep = hostbuf + sizeof hostbuf; - cp = answer->buf + HFIXEDSZ; - if (qdcount != 1) { - h_errno = NO_RECOVERY; - return (NULL); - } - n = dn_expand(answer->buf, eom, cp, bp, ep - bp); - 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; - /* 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, ep - bp); - 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 > ep - bp || n >= MAXHOSTNAMELEN) { - had_error++; - continue; - } - strlcpy(bp, tbuf, (size_t)(ep - bp)); - canonname = bp; - bp += n; - continue; - } - if (qtype == T_ANY) { - if (!(type == T_A || type == T_AAAA)) { - cp += n; - continue; - } - } else if (type != qtype) { - 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)); - cp += n; - continue; /* XXX - had_error++ ? */ - } - switch (type) { - case T_A: - case T_AAAA: - if (strcasecmp(canonname, bp) != 0) { - syslog(LOG_NOTICE|LOG_AUTH, - AskedForGot, canonname, bp); - cp += n; - continue; /* XXX - had_error++ ? */ - } - if (type == T_A && n != INADDRSZ) { - cp += n; - continue; - } - if (type == T_AAAA && n != IN6ADDRSZ) { - cp += n; - continue; - } - if (type == T_AAAA) { - struct in6_addr in6; - memcpy(&in6, cp, IN6ADDRSZ); - if (IN6_IS_ADDR_V4MAPPED(&in6)) { - cp += n; - continue; - } - } - if (!haveanswer) { - int nn; - - canonname = bp; - nn = strlen(bp) + 1; /* for the \0 */ - bp += 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; -} - -#define SORTEDADDR(p) (((struct sockaddr_in *)(void *)(p->ai_next->ai_addr))->sin_addr.s_addr) -#define SORTMATCH(p, s) ((SORTEDADDR(p) & (s).mask) == (s).addr.s_addr) - -static void -aisort(struct addrinfo *s, res_state res) -{ - struct addrinfo head, *t, *p; - int i; - - head.ai_next = NULL; - t = &head; - - for (i = 0; i < res->nsort; i++) { - p = s; - while (p->ai_next) { - if ((p->ai_next->ai_family != AF_INET) - || SORTMATCH(p, res->sort_list[i])) { - t->ai_next = p->ai_next; - t = t->ai_next; - p->ai_next = p->ai_next->ai_next; - } else { - p = p->ai_next; - } - } - } - - /* add rest of list and reset s to the new list*/ - t->ai_next = s->ai_next; - s->ai_next = head.ai_next; -} - -/*ARGSUSED*/ -static int -_dns_getaddrinfo(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; - res_state res; - - name = va_arg(ap, char *); - pai = va_arg(ap, const struct addrinfo *); - - fprintf(stderr, "_dns_getaddrinfo() name = '%s'\n", name); - - memset(&q, 0, sizeof(q)); - memset(&q2, 0, sizeof(q2)); - memset(&sentinel, 0, sizeof(sentinel)); - cur = &sentinel; - - buf = malloc(sizeof(*buf)); - if (buf == NULL) { - h_errno = NETDB_INTERNAL; - return NS_NOTFOUND; - } - buf2 = malloc(sizeof(*buf2)); - if (buf2 == NULL) { - free(buf); - h_errno = NETDB_INTERNAL; - return NS_NOTFOUND; - } - - switch (pai->ai_family) { - case AF_UNSPEC: - /* prefer IPv6 */ - q.name = name; - q.qclass = C_IN; - q.qtype = T_AAAA; - q.answer = buf->buf; - q.anslen = sizeof(buf->buf); - q.next = &q2; - q2.name = name; - q2.qclass = C_IN; - q2.qtype = T_A; - q2.answer = buf2->buf; - q2.anslen = sizeof(buf2->buf); - break; - case AF_INET: - q.name = name; - q.qclass = C_IN; - q.qtype = T_A; - q.answer = buf->buf; - q.anslen = sizeof(buf->buf); - break; - case AF_INET6: - q.name = name; - q.qclass = C_IN; - q.qtype = T_AAAA; - q.answer = buf->buf; - q.anslen = sizeof(buf->buf); - break; - default: - free(buf); - free(buf2); - return NS_UNAVAIL; - } - - res = __res_get_state(); - if (res == NULL) { - free(buf); - free(buf2); - return NS_NOTFOUND; - } - - if (res_searchN(name, &q, res) < 0) { - __res_put_state(res); - free(buf); - free(buf2); - 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; - } - free(buf); - free(buf2); - if (sentinel.ai_next == NULL) { - __res_put_state(res); - switch (h_errno) { - case HOST_NOT_FOUND: - return NS_NOTFOUND; - case TRY_AGAIN: - return NS_TRYAGAIN; - default: - return NS_UNAVAIL; - } - } - - if (res->nsort) - aisort(&sentinel, res); - - __res_put_state(res); - - *((struct addrinfo **)rv) = sentinel.ai_next; - return NS_SUCCESS; -} - -static void -_sethtent(FILE **hostf) -{ - - if (!*hostf) - *hostf = fopen(_PATH_HOSTS, "r" ); - else - rewind(*hostf); -} - -static void -_endhtent(FILE **hostf) -{ - - if (*hostf) { - (void) fclose(*hostf); - *hostf = NULL; - } -} - -static struct addrinfo * -_gethtent(FILE **hostf, 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]; - -// fprintf(stderr, "_gethtent() name = '%s'\n", name); - assert(name != NULL); - assert(pai != NULL); - - 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; - /* if this is not something we're looking for, skip it. */ - cname = NULL; - while (cp && *cp) { - if (*cp == ' ' || *cp == '\t') { - cp++; - continue; - } - if (!cname) - cname = cp; - tname = cp; - if ((cp = strpbrk(cp, " \t")) != NULL) - *cp++ = '\0'; -// fprintf(stderr, "\ttname = '%s'", tname); - 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; - 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(void *rv, void *cb_data, va_list ap) -{ - const char *name; - const struct addrinfo *pai; - struct addrinfo sentinel, *cur; - struct addrinfo *p; - FILE *hostf = NULL; - - name = va_arg(ap, char *); - pai = va_arg(ap, struct addrinfo *); - -// fprintf(stderr, "_files_getaddrinfo() name = '%s'\n", name); - memset(&sentinel, 0, sizeof(sentinel)); - cur = &sentinel; - - _sethtent(&hostf); - while ((p = _gethtent(&hostf, name, pai)) != NULL) { - cur->ai_next = p; - while (cur && cur->ai_next) - cur = cur->ai_next; - } - _endhtent(&hostf); - - *((struct addrinfo **)rv) = sentinel.ai_next; - if (sentinel.ai_next == NULL) - return NS_NOTFOUND; - return NS_SUCCESS; -} - -/* resolver logic */ - -/* - * 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(const char *name, /* domain name */ struct res_target *target, - res_state res) -{ - u_char buf[MAXPACKET]; - HEADER *hp; - int n; - struct res_target *t; - int rcode; - int ancount; - - assert(name != NULL); - /* XXX: target may be NULL??? */ - - rcode = NOERROR; - ancount = 0; - - 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_nquery(%s, %d, %d)\n", name, class, type); -#endif - - n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL, - buf, sizeof(buf)); -#ifdef RES_USE_EDNS0 - if (n > 0 && (res->options & RES_USE_EDNS0) != 0) - n = res_nopt(res, n, buf, sizeof(buf), anslen); -#endif - if (n <= 0) { -#ifdef DEBUG - if (res->options & RES_DEBUG) - printf(";; res_nquery: mkquery failed\n"); -#endif - h_errno = NO_RECOVERY; - return n; - } - n = res_nsend(res, 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 = %u, ancount=%u\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(const char *name, struct res_target *target, res_state res) -{ - const char *cp, * const *domain; - HEADER *hp; - u_int dots; - int trailing_dot, ret, saved_herrno; - int got_nodata = 0, got_servfail = 0, tried_as_is = 0; - - assert(name != NULL); - assert(target != NULL); - - hp = (HEADER *)(void *)target->answer; /*XXX*/ - - 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++; - - -fprintf(stderr, "res_searchN() name = '%s'\n", name); - - /* - * if there aren't any dots, it could be a user-level alias - */ - if (!dots && (cp = __hostalias(name)) != NULL) { - ret = res_queryN(cp, target, res); - return ret; - } - - /* - * 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, res); - 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, res); - 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) { - ret = res_querydomainN(name, NULL, target, res); - 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(const char *name, const char *domain, - struct res_target *target, res_state res) -{ - char nbuf[MAXDNAME]; - const char *longname = nbuf; - size_t n, d; - - assert(name != NULL); - /* XXX: target may be NULL??? */ - -#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 + 1 > sizeof(nbuf)) { - 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 + 1 + d + 1 > sizeof(nbuf)) { - h_errno = NO_RECOVERY; - return -1; - } - snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain); - } - return res_queryN(longname, target, res); -} |