diff options
Diffstat (limited to 'lib/libc/net/getaddrinfo.c')
| -rw-r--r-- | lib/libc/net/getaddrinfo.c | 2848 |
1 files changed, 0 insertions, 2848 deletions
diff --git a/lib/libc/net/getaddrinfo.c b/lib/libc/net/getaddrinfo.c deleted file mode 100644 index 830e464..0000000 --- a/lib/libc/net/getaddrinfo.c +++ /dev/null @@ -1,2848 +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: - * - 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: - * - 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? - * - * OS specific notes for freebsd4: - * - FreeBSD supported $GAI. The code does not. - */ - -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include "namespace.h" -#include <sys/types.h> -#include <sys/param.h> -#include <sys/socket.h> -#include <net/if.h> -#include <netinet/in.h> -#include <sys/queue.h> -#ifdef INET6 -#include <net/if_var.h> -#include <sys/sysctl.h> -#include <sys/ioctl.h> -#include <netinet6/in6_var.h> /* XXX */ -#endif -#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> - -#include "res_config.h" - -#ifdef DEBUG -#include <syslog.h> -#endif - -#include <stdarg.h> -#include <nsswitch.h> -#include "un-namespace.h" -#include "libc_private.h" -#ifdef NS_CACHING -#include "nscache.h" -#endif - -#if defined(__KAME__) && defined(INET6) -# define FAITH -#endif - -#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 - -struct policyqueue { - TAILQ_ENTRY(policyqueue) pc_entry; -#ifdef INET6 - struct in6_addrpolicy pc_policy; -#endif -}; -TAILQ_HEAD(policyhead, policyqueue); - -static const struct afd { - int a_af; - int a_addrlen; - socklen_t 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, 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_STREAM, IPPROTO_SCTP, "sctp", 0x03 }, - { PF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP, "sctp", 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_STREAM, IPPROTO_SCTP, "sctp", 0x03 }, - { PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP, "sctp", 0x07 }, - { PF_INET, SOCK_RAW, ANY, NULL, 0x05 }, - { -1, 0, 0, NULL, 0 }, -}; - -#ifdef INET6 -#define PTON_MAX 16 -#else -#define PTON_MAX 4 -#endif - -#define AIO_SRCFLAG_DEPRECATED 0x1 - -struct ai_order { - union { - struct sockaddr_storage aiou_ss; - struct sockaddr aiou_sa; - } aio_src_un; -#define aio_srcsa aio_src_un.aiou_sa - u_int32_t aio_srcflag; - int aio_srcscope; - int aio_dstscope; - struct policyqueue *aio_srcpolicy; - struct policyqueue *aio_dstpolicy; - struct addrinfo *aio_ai; - int aio_matchlen; -}; - -static const ns_src default_dns_files[] = { - { NSSRC_FILES, NS_SUCCESS }, - { NSSRC_DNS, NS_SUCCESS }, - { 0 } -}; - -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 */ -}; - -#define MAXPACKET (64*1024) - -typedef union { - HEADER hdr; - u_char buf[MAXPACKET]; -} querybuf; - -static int str2number(const char *, int *); -static int explore_copy(const struct addrinfo *, const struct addrinfo *, - 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 struct addrinfo *copy_ai(const struct addrinfo *); -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 *); -static void set_source(struct ai_order *, struct policyhead *); -static int comp_dst(const void *, const void *); -#ifdef INET6 -static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *); -#endif -static int gai_addr2scopetype(struct sockaddr *); - -static int explore_fqdn(const struct addrinfo *, const char *, - const char *, struct addrinfo **); - -static int reorder(struct addrinfo *); -static int get_addrselectpolicy(struct policyhead *); -static void free_addrselectpolicy(struct policyhead *); -static struct policyqueue *match_addrselectpolicy(struct sockaddr *, - struct policyhead *); -static int matchlen(struct sockaddr *, struct sockaddr *); - -static struct addrinfo *getanswer(const querybuf *, int, const char *, int, - const struct addrinfo *, res_state); -#if defined(RESOLVSORT) -static int addr4sort(struct addrinfo *, res_state); -#endif -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); -#ifdef YP -static struct addrinfo *_yphostent(char *, const struct addrinfo *); -static int _yp_getaddrinfo(void *, void *, va_list); -#endif -#ifdef NS_CACHING -static int addrinfo_id_func(char *, size_t *, va_list, void *); -static int addrinfo_marshal_func(char *, size_t *, void *, va_list, void *); -static int addrinfo_unmarshal_func(char *, size_t, void *, va_list, void *); -#endif - -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); - -/* 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))) - -void -freeaddrinfo(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 -str2number(const char *p, int *portp) -{ - char *ep; - unsigned long v; - - if (*p == '\0') - return -1; - ep = NULL; - errno = 0; - v = strtoul(p, &ep, 10); - if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) { - *portp = v; - return 0; - } 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, ai0, *afai; - struct addrinfo *pai; - const struct afd *afd; - const struct explore *ex; - struct addrinfo *afailist[sizeof(afdl)/sizeof(afdl[0])]; - struct addrinfo *afai_unspec; - int found; - int numeric = 0; - - /* ensure we return NULL on errors */ - *res = NULL; - - memset(&ai, 0, sizeof(ai)); - - memset(afailist, 0, sizeof(afailist)); - afai_unspec = 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 (!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; - - /* matched */ - break; - } - - if (ex->e_af < 0) - 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. - * If numeric representation of AF1 can be interpreted as FQDN - * representation of AF2, we need to think again about the code below. - */ - found = 0; - for (afd = afdl; afd->a_af; afd++) { - *pai = ai0; - - if (!MATCH_FAMILY(pai->ai_family, afd->a_af, 1)) - continue; - - if (pai->ai_family == PF_UNSPEC) - pai->ai_family = afd->a_af; - - if (hostname == NULL) { - error = explore_null(pai, servname, - &afailist[afd - afdl]); - - /* - * Errors from explore_null should be unexpected and - * be caught to avoid returning an incomplete result. - */ - if (error != 0) - goto bad; - } else { - error = explore_numeric_scope(pai, hostname, servname, - &afailist[afd - afdl]); - - /* - * explore_numeric_scope returns an error for address - * families that do not match that of hostname. - * Thus we should not catch the error at this moment. - */ - } - - if (!error && afailist[afd - afdl]) - found++; - } - if (found) { - numeric = 1; - goto globcopy; - } - - if (hostname == NULL) - ERR(EAI_NONAME); /* used to be EAI_NODATA */ - if (pai->ai_flags & AI_NUMERICHOST) - ERR(EAI_NONAME); - - if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0)) - ERR(EAI_FAIL); - - /* - * hostname as alphabetical name. - */ - *pai = ai0; - error = explore_fqdn(pai, hostname, servname, &afai_unspec); - -globcopy: - for (ex = explore; ex->e_af >= 0; ex++) { - *pai = ai0; - - 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 the servname does not match socktype/protocol, ignore it. - */ - if (get_portmatch(pai, servname) != 0) - continue; - - if (afai_unspec) - afai = afai_unspec; - else { - if ((afd = find_afd(pai->ai_family)) == NULL) - continue; - /* XXX assumes that afd points inside afdl[] */ - afai = afailist[afd - afdl]; - } - if (!afai) - continue; - - error = explore_copy(pai, afai, &cur->ai_next); - if (error != 0) - goto bad; - - while (cur && cur->ai_next) - cur = cur->ai_next; - } - - /* - * ensure we return either: - * - error == 0, non-NULL *res - * - error != 0, NULL *res - */ - if (error == 0) { - if (sentinel.ai_next) { - /* - * If the returned entry is for an active connection, - * and the given name is not numeric, reorder the - * list, so that the application would try the list - * in the most efficient order. Since the head entry - * of the original list may contain ai_canonname and - * that entry may be moved elsewhere in the new list, - * we keep the pointer and will restore it in the new - * head entry. (Note that RFC3493 requires the head - * entry store it when requested by the caller). - */ - if (hints == NULL || !(hints->ai_flags & AI_PASSIVE)) { - if (!numeric) { - char *canonname; - - canonname = - sentinel.ai_next->ai_canonname; - sentinel.ai_next->ai_canonname = NULL; - (void)reorder(&sentinel); - if (sentinel.ai_next->ai_canonname == - NULL) { - sentinel.ai_next->ai_canonname - = canonname; - } else if (canonname != NULL) - free(canonname); - } - } - *res = sentinel.ai_next; - } else - error = EAI_FAIL; - } - -bad: - if (afai_unspec) - freeaddrinfo(afai_unspec); - for (afd = afdl; afd->a_af; afd++) { - if (afailist[afd - afdl]) - freeaddrinfo(afailist[afd - afdl]); - } - if (!*res) - if (sentinel.ai_next) - freeaddrinfo(sentinel.ai_next); - - return (error); -} - -static int -reorder(struct addrinfo *sentinel) -{ - struct addrinfo *ai, **aip; - struct ai_order *aio; - int i, n; - struct policyhead policyhead; - - /* count the number of addrinfo elements for sorting. */ - for (n = 0, ai = sentinel->ai_next; ai != NULL; ai = ai->ai_next, n++) - ; - - /* - * If the number is small enough, we can skip the reordering process. - */ - if (n <= 1) - return(n); - - /* allocate a temporary array for sort and initialization of it. */ - if ((aio = malloc(sizeof(*aio) * n)) == NULL) - return(n); /* give up reordering */ - memset(aio, 0, sizeof(*aio) * n); - - /* retrieve address selection policy from the kernel */ - TAILQ_INIT(&policyhead); - if (!get_addrselectpolicy(&policyhead)) { - /* no policy is installed into kernel, we don't sort. */ - free(aio); - return (n); - } - - for (i = 0, ai = sentinel->ai_next; i < n; ai = ai->ai_next, i++) { - aio[i].aio_ai = ai; - aio[i].aio_dstscope = gai_addr2scopetype(ai->ai_addr); - aio[i].aio_dstpolicy = match_addrselectpolicy(ai->ai_addr, - &policyhead); - set_source(&aio[i], &policyhead); - } - - /* perform sorting. */ - qsort(aio, n, sizeof(*aio), comp_dst); - - /* reorder the addrinfo chain. */ - for (i = 0, aip = &sentinel->ai_next; i < n; i++) { - *aip = aio[i].aio_ai; - aip = &aio[i].aio_ai->ai_next; - } - *aip = NULL; - - /* cleanup and return */ - free(aio); - free_addrselectpolicy(&policyhead); - return(n); -} - -static int -get_addrselectpolicy(struct policyhead *head) -{ -#ifdef INET6 - int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY }; - size_t l; - char *buf; - struct in6_addrpolicy *pol, *ep; - - if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), NULL, &l, NULL, 0) < 0) - return (0); - if ((buf = malloc(l)) == NULL) - return (0); - if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), buf, &l, NULL, 0) < 0) { - free(buf); - return (0); - } - - ep = (struct in6_addrpolicy *)(buf + l); - for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) { - struct policyqueue *new; - - if ((new = malloc(sizeof(*new))) == NULL) { - free_addrselectpolicy(head); /* make the list empty */ - break; - } - new->pc_policy = *pol; - TAILQ_INSERT_TAIL(head, new, pc_entry); - } - - free(buf); - return (1); -#else - return (0); -#endif -} - -static void -free_addrselectpolicy(struct policyhead *head) -{ - struct policyqueue *ent, *nent; - - for (ent = TAILQ_FIRST(head); ent; ent = nent) { - nent = TAILQ_NEXT(ent, pc_entry); - TAILQ_REMOVE(head, ent, pc_entry); - free(ent); - } -} - -static struct policyqueue * -match_addrselectpolicy(struct sockaddr *addr, struct policyhead *head) -{ -#ifdef INET6 - struct policyqueue *ent, *bestent = NULL; - struct in6_addrpolicy *pol; - int matchlen, bestmatchlen = -1; - u_char *mp, *ep, *k, *p, m; - struct sockaddr_in6 key; - - switch(addr->sa_family) { - case AF_INET6: - key = *(struct sockaddr_in6 *)addr; - break; - case AF_INET: - /* convert the address into IPv4-mapped IPv6 address. */ - memset(&key, 0, sizeof(key)); - key.sin6_family = AF_INET6; - key.sin6_len = sizeof(key); - key.sin6_addr.s6_addr[10] = 0xff; - key.sin6_addr.s6_addr[11] = 0xff; - memcpy(&key.sin6_addr.s6_addr[12], - &((struct sockaddr_in *)addr)->sin_addr, 4); - break; - default: - return(NULL); - } - - for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) { - pol = &ent->pc_policy; - matchlen = 0; - - mp = (u_char *)&pol->addrmask.sin6_addr; - ep = mp + 16; /* XXX: scope field? */ - k = (u_char *)&key.sin6_addr; - p = (u_char *)&pol->addr.sin6_addr; - for (; mp < ep && *mp; mp++, k++, p++) { - m = *mp; - if ((*k & m) != *p) - goto next; /* not match */ - if (m == 0xff) /* short cut for a typical case */ - matchlen += 8; - else { - while (m >= 0x80) { - matchlen++; - m <<= 1; - } - } - } - - /* matched. check if this is better than the current best. */ - if (matchlen > bestmatchlen) { - bestent = ent; - bestmatchlen = matchlen; - } - - next: - continue; - } - - return(bestent); -#else - return(NULL); -#endif - -} - -static void -set_source(struct ai_order *aio, struct policyhead *ph) -{ - struct addrinfo ai = *aio->aio_ai; - struct sockaddr_storage ss; - socklen_t srclen; - int s; - - /* set unspec ("no source is available"), just in case */ - aio->aio_srcsa.sa_family = AF_UNSPEC; - aio->aio_srcscope = -1; - - switch(ai.ai_family) { - case AF_INET: -#ifdef INET6 - case AF_INET6: -#endif - break; - default: /* ignore unsupported AFs explicitly */ - return; - } - - /* XXX: make a dummy addrinfo to call connect() */ - ai.ai_socktype = SOCK_DGRAM; - ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */ - ai.ai_next = NULL; - memset(&ss, 0, sizeof(ss)); - memcpy(&ss, ai.ai_addr, ai.ai_addrlen); - ai.ai_addr = (struct sockaddr *)&ss; - get_port(&ai, "1", 0); - - /* open a socket to get the source address for the given dst */ - if ((s = _socket(ai.ai_family, ai.ai_socktype, ai.ai_protocol)) < 0) - return; /* give up */ - if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0) - goto cleanup; - srclen = ai.ai_addrlen; - if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) { - aio->aio_srcsa.sa_family = AF_UNSPEC; - goto cleanup; - } - aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa); - aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph); - aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr); -#ifdef INET6 - if (ai.ai_family == AF_INET6) { - struct in6_ifreq ifr6; - u_int32_t flags6; - - /* XXX: interface name should not be hardcoded */ - strncpy(ifr6.ifr_name, "lo0", sizeof(ifr6.ifr_name)); - memset(&ifr6, 0, sizeof(ifr6)); - memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen); - if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) { - flags6 = ifr6.ifr_ifru.ifru_flags6; - if ((flags6 & IN6_IFF_DEPRECATED)) - aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED; - } - } -#endif - - cleanup: - _close(s); - return; -} - -static int -matchlen(struct sockaddr *src, struct sockaddr *dst) -{ - int match = 0; - u_char *s, *d; - u_char *lim, r; - int addrlen; - - switch (src->sa_family) { -#ifdef INET6 - case AF_INET6: - s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr; - d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr; - addrlen = sizeof(struct in6_addr); - lim = s + addrlen; - break; -#endif - case AF_INET: - s = (u_char *)&((struct sockaddr_in *)src)->sin_addr; - d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr; - addrlen = sizeof(struct in_addr); - lim = s + addrlen; - break; - default: - return(0); - } - - while (s < lim) - if ((r = (*d++ ^ *s++)) != 0) { - while (r < addrlen * 8) { - match++; - r <<= 1; - } - break; - } else - match += 8; - return(match); -} - -static int -comp_dst(const void *arg1, const void *arg2) -{ - const struct ai_order *dst1 = arg1, *dst2 = arg2; - - /* - * Rule 1: Avoid unusable destinations. - * XXX: we currently do not consider if an appropriate route exists. - */ - if (dst1->aio_srcsa.sa_family != AF_UNSPEC && - dst2->aio_srcsa.sa_family == AF_UNSPEC) { - return(-1); - } - if (dst1->aio_srcsa.sa_family == AF_UNSPEC && - dst2->aio_srcsa.sa_family != AF_UNSPEC) { - return(1); - } - - /* Rule 2: Prefer matching scope. */ - if (dst1->aio_dstscope == dst1->aio_srcscope && - dst2->aio_dstscope != dst2->aio_srcscope) { - return(-1); - } - if (dst1->aio_dstscope != dst1->aio_srcscope && - dst2->aio_dstscope == dst2->aio_srcscope) { - return(1); - } - - /* Rule 3: Avoid deprecated addresses. */ - if (dst1->aio_srcsa.sa_family != AF_UNSPEC && - dst2->aio_srcsa.sa_family != AF_UNSPEC) { - if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) && - (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) { - return(-1); - } - if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) && - !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) { - return(1); - } - } - - /* Rule 4: Prefer home addresses. */ - /* XXX: not implemented yet */ - - /* Rule 5: Prefer matching label. */ -#ifdef INET6 - if (dst1->aio_srcpolicy && dst1->aio_dstpolicy && - dst1->aio_srcpolicy->pc_policy.label == - dst1->aio_dstpolicy->pc_policy.label && - (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL || - dst2->aio_srcpolicy->pc_policy.label != - dst2->aio_dstpolicy->pc_policy.label)) { - return(-1); - } - if (dst2->aio_srcpolicy && dst2->aio_dstpolicy && - dst2->aio_srcpolicy->pc_policy.label == - dst2->aio_dstpolicy->pc_policy.label && - (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL || - dst1->aio_srcpolicy->pc_policy.label != - dst1->aio_dstpolicy->pc_policy.label)) { - return(1); - } -#endif - - /* Rule 6: Prefer higher precedence. */ -#ifdef INET6 - if (dst1->aio_dstpolicy && - (dst2->aio_dstpolicy == NULL || - dst1->aio_dstpolicy->pc_policy.preced > - dst2->aio_dstpolicy->pc_policy.preced)) { - return(-1); - } - if (dst2->aio_dstpolicy && - (dst1->aio_dstpolicy == NULL || - dst2->aio_dstpolicy->pc_policy.preced > - dst1->aio_dstpolicy->pc_policy.preced)) { - return(1); - } -#endif - - /* Rule 7: Prefer native transport. */ - /* XXX: not implemented yet */ - - /* Rule 8: Prefer smaller scope. */ - if (dst1->aio_dstscope >= 0 && - dst1->aio_dstscope < dst2->aio_dstscope) { - return(-1); - } - if (dst2->aio_dstscope >= 0 && - dst2->aio_dstscope < dst1->aio_dstscope) { - return(1); - } - - /* - * Rule 9: Use longest matching prefix. - * We compare the match length in a same AF only. - */ - if (dst1->aio_ai->ai_addr->sa_family == - dst2->aio_ai->ai_addr->sa_family) { - if (dst1->aio_matchlen > dst2->aio_matchlen) { - return(-1); - } - if (dst1->aio_matchlen < dst2->aio_matchlen) { - return(1); - } - } - - /* Rule 10: Otherwise, leave the order unchanged. */ - return(-1); -} - -/* - * Copy from scope.c. - * XXX: we should standardize the functions and link them as standard - * library. - */ -static int -gai_addr2scopetype(struct sockaddr *sa) -{ -#ifdef INET6 - struct sockaddr_in6 *sa6; -#endif - struct sockaddr_in *sa4; - - switch(sa->sa_family) { -#ifdef INET6 - case AF_INET6: - sa6 = (struct sockaddr_in6 *)sa; - if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { - /* just use the scope field of the multicast address */ - return(sa6->sin6_addr.s6_addr[2] & 0x0f); - } - /* - * Unicast addresses: map scope type to corresponding scope - * value defined for multcast addresses. - * XXX: hardcoded scope type values are bad... - */ - if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr)) - return(1); /* node local scope */ - if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) - return(2); /* link-local scope */ - if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr)) - return(5); /* site-local scope */ - return(14); /* global scope */ - break; -#endif - case AF_INET: - /* - * IPv4 pseudo scoping according to RFC 3484. - */ - sa4 = (struct sockaddr_in *)sa; - /* IPv4 autoconfiguration addresses have link-local scope. */ - if (((u_char *)&sa4->sin_addr)[0] == 169 && - ((u_char *)&sa4->sin_addr)[1] == 254) - return(2); - /* Private addresses have site-local scope. */ - if (((u_char *)&sa4->sin_addr)[0] == 10 || - (((u_char *)&sa4->sin_addr)[0] == 172 && - (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) || - (((u_char *)&sa4->sin_addr)[0] == 192 && - ((u_char *)&sa4->sin_addr)[1] == 168)) - return(14); /* XXX: It should be 5 unless NAT */ - /* Loopback addresses have link-local scope. */ - if (((u_char *)&sa4->sin_addr)[0] == 127) - return(2); - return(14); - break; - default: - errno = EAFNOSUPPORT; /* is this a good error? */ - return(-1); - } -} - -static int -explore_copy(const struct addrinfo *pai, const struct addrinfo *src0, - struct addrinfo **res) -{ - int error; - struct addrinfo sentinel, *cur; - const struct addrinfo *src; - - error = 0; - sentinel.ai_next = NULL; - cur = &sentinel; - - for (src = src0; src != NULL; src = src->ai_next) { - if (src->ai_family != pai->ai_family) - continue; - - cur->ai_next = copy_ai(src); - if (!cur->ai_next) { - error = EAI_MEMORY; - goto fail; - } - - cur->ai_next->ai_socktype = pai->ai_socktype; - cur->ai_next->ai_protocol = pai->ai_protocol; - cur = cur->ai_next; - } - - *res = sentinel.ai_next; - return 0; - -fail: - freeaddrinfo(sentinel.ai_next); - 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 *ai; - int error; - - *res = NULL; - ai = NULL; - - /* - * 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); - - afd = find_afd(pai->ai_family); - if (afd == NULL) - return 0; - - if (pai->ai_flags & AI_PASSIVE) { - GET_AI(ai, afd, afd->a_addrany); - GET_PORT(ai, servname); - } else { - GET_AI(ai, afd, afd->a_loopback); - GET_PORT(ai, servname); - } - - *res = ai; - return 0; - -free: - if (ai != NULL) - freeaddrinfo(ai); - 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 *ai; - int error; - char pton[PTON_MAX]; - - *res = NULL; - ai = NULL; - - afd = find_afd(pai->ai_family); - if (afd == NULL) - return 0; - - switch (afd->a_af) { - case AF_INET: - /* - * RFC3493 requires getaddrinfo() to accept AF_INET formats - * that are accepted by inet_addr() and its family. The - * accepted forms includes the "classful" one, which inet_pton - * does not accept. So we need to separate the case for - * AF_INET. - */ - if (inet_aton(hostname, (struct in_addr *)pton) != 1) - return 0; - break; - default: - if (inet_pton(afd->a_af, hostname, pton) != 1) - return 0; - break; - } - - if (pai->ai_family == afd->a_af) { - GET_AI(ai, afd, pton); - GET_PORT(ai, servname); - if ((pai->ai_flags & AI_CANONNAME)) { - /* - * Set the numeric address itself as the canonical - * name, based on a clarification in RFC3493. - */ - GET_CANONNAME(ai, canonname); - } - } else { - /* - * XXX: This should not happen since we already matched the AF - * by find_afd. - */ - ERR(EAI_FAMILY); - } - - *res = ai; - return 0; - -free: -bad: - if (ai != NULL) - freeaddrinfo(ai); - 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; - - 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); - freeaddrinfo(*res); - *res = NULL; - return(EAI_NONAME); /* XXX: is return OK? */ - } - sin6->sin6_scope_id = scopeid; - } - } - - free(hostname2); - - if (error && *res) { - freeaddrinfo(*res); - *res = NULL; - } - return error; -#endif -} - -static int -get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str) -{ - 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; -#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_addr->sa_len = 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; -} - -/* XXX need to malloc() the same way we do from other functions! */ -static struct addrinfo * -copy_ai(const struct addrinfo *pai) -{ - struct addrinfo *ai; - size_t l; - - l = sizeof(*ai) + pai->ai_addrlen; - if ((ai = (struct addrinfo *)malloc(l)) == NULL) - return NULL; - memset(ai, 0, l); - memcpy(ai, pai, sizeof(*ai)); - ai->ai_addr = (struct sockaddr *)(void *)(ai + 1); - memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen); - - if (pai->ai_canonname) { - l = strlen(pai->ai_canonname) + 1; - if ((ai->ai_canonname = malloc(l)) == NULL) { - free(ai); - return NULL; - } - strlcpy(ai->ai_canonname, pai->ai_canonname, l); - } else { - /* just to make sure */ - ai->ai_canonname = NULL; - } - - ai->ai_next = NULL; - - return ai; -} - -static int -get_portmatch(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(struct addrinfo *ai, const char *servname, int matchonly) -{ - const char *proto; - struct servent *sp; - int port, error; - 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: - case SOCK_SEQPACKET: - allownumeric = 1; - break; - case ANY: - switch (ai->ai_family) { - case AF_INET: -#ifdef AF_INET6 - case AF_INET6: -#endif - allownumeric = 1; - break; - default: - allownumeric = 0; - break; - } - break; - default: - return EAI_SOCKTYPE; - } - - error = str2number(servname, &port); - if (error == 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_protocol) { - case IPPROTO_UDP: - proto = "udp"; - break; - case IPPROTO_TCP: - proto = "tcp"; - break; - case IPPROTO_SCTP: - proto = "sctp"; - 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; -} - -/* - * 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(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(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid) -{ - u_long lscopeid; - struct in6_addr *a6; - char *ep; - - 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 - - -#ifdef NS_CACHING -static int -addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap, - void *cache_mdata) -{ - res_state statp; - u_long res_options; - - const int op_id = 0; /* identifies the getaddrinfo for the cache */ - char *hostname; - struct addrinfo *hints; - - char *p; - int ai_flags, ai_family, ai_socktype, ai_protocol; - size_t desired_size, size; - - statp = __res_state(); - res_options = statp->options & (RES_RECURSE | RES_DEFNAMES | - RES_DNSRCH | RES_NOALIASES | RES_USE_INET6); - - hostname = va_arg(ap, char *); - hints = va_arg(ap, struct addrinfo *); - - desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4; - if (hostname != NULL) { - size = strlen(hostname); - desired_size += size + 1; - } else - size = 0; - - if (desired_size > *buffer_size) { - *buffer_size = desired_size; - return (NS_RETURN); - } - - if (hints == NULL) - ai_flags = ai_family = ai_socktype = ai_protocol = 0; - else { - ai_flags = hints->ai_flags; - ai_family = hints->ai_family; - ai_socktype = hints->ai_socktype; - ai_protocol = hints->ai_protocol; - } - - p = buffer; - memcpy(p, &res_options, sizeof(res_options)); - p += sizeof(res_options); - - memcpy(p, &op_id, sizeof(int)); - p += sizeof(int); - - memcpy(p, &ai_flags, sizeof(int)); - p += sizeof(int); - - memcpy(p, &ai_family, sizeof(int)); - p += sizeof(int); - - memcpy(p, &ai_socktype, sizeof(int)); - p += sizeof(int); - - memcpy(p, &ai_protocol, sizeof(int)); - p += sizeof(int); - - if (hostname != NULL) - memcpy(p, hostname, size); - - *buffer_size = desired_size; - return (NS_SUCCESS); -} - -static int -addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval, - va_list ap, void *cache_mdata) -{ - struct addrinfo *ai, *cai; - char *p; - size_t desired_size, size, ai_size; - - ai = *((struct addrinfo **)retval); - - desired_size = sizeof(size_t); - ai_size = 0; - for (cai = ai; cai != NULL; cai = cai->ai_next) { - desired_size += sizeof(struct addrinfo) + cai->ai_addrlen; - if (cai->ai_canonname != NULL) - desired_size += sizeof(size_t) + - strlen(cai->ai_canonname); - ++ai_size; - } - - if (desired_size > *buffer_size) { - /* this assignment is here for future use */ - errno = ERANGE; - *buffer_size = desired_size; - return (NS_RETURN); - } - - memset(buffer, 0, desired_size); - p = buffer; - - memcpy(p, &ai_size, sizeof(size_t)); - p += sizeof(size_t); - for (cai = ai; cai != NULL; cai = cai->ai_next) { - memcpy(p, cai, sizeof(struct addrinfo)); - p += sizeof(struct addrinfo); - - memcpy(p, cai->ai_addr, cai->ai_addrlen); - p += cai->ai_addrlen; - - if (cai->ai_canonname != NULL) { - size = strlen(cai->ai_canonname); - memcpy(p, &size, sizeof(size_t)); - p += sizeof(size_t); - - memcpy(p, cai->ai_canonname, size); - p += size; - } - } - - return (NS_SUCCESS); -} - -static int -addrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval, - va_list ap, void *cache_mdata) -{ - struct addrinfo new_ai, *result, *sentinel, *lasts; - - char *p; - size_t ai_size, ai_i, size; - - p = buffer; - memcpy(&ai_size, p, sizeof(size_t)); - p += sizeof(size_t); - - result = NULL; - lasts = NULL; - for (ai_i = 0; ai_i < ai_size; ++ai_i) { - memcpy(&new_ai, p, sizeof(struct addrinfo)); - p += sizeof(struct addrinfo); - size = new_ai.ai_addrlen + sizeof(struct addrinfo) + - _ALIGNBYTES; - - sentinel = (struct addrinfo *)malloc(size); - memset(sentinel, 0, size); - - memcpy(sentinel, &new_ai, sizeof(struct addrinfo)); - sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel + - sizeof(struct addrinfo)); - - memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen); - p += new_ai.ai_addrlen; - - if (new_ai.ai_canonname != NULL) { - memcpy(&size, p, sizeof(size_t)); - p += sizeof(size_t); - - sentinel->ai_canonname = (char *)malloc(size + 1); - memset(sentinel->ai_canonname, 0, size + 1); - - memcpy(sentinel->ai_canonname, p, size); - p += size; - } - - if (result == NULL) { - result = sentinel; - lasts = sentinel; - } else { - lasts->ai_next = sentinel; - lasts = sentinel; - } - } - - *((struct addrinfo **)retval) = result; - return (NS_SUCCESS); -} -#endif /* NS_CACHING */ - -/* - * 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; - -#ifdef NS_CACHING - static const nss_cache_info cache_info = - NS_COMMON_CACHE_INFO_INITIALIZER( - hosts, NULL, addrinfo_id_func, addrinfo_marshal_func, - addrinfo_unmarshal_func); -#endif - static const ns_dtab dtab[] = { - NS_FILES_CB(_files_getaddrinfo, NULL) - { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */ - NS_NIS_CB(_yp_getaddrinfo, NULL) -#ifdef NS_CACHING - NS_CACHE_CB(&cache_info) -#endif - { 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_NONAME; - 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; -} - -#ifdef DEBUG -static const char AskedForGot[] = - "gethostby*.getanswer: asked for \"%s\", got \"%s\""; -#endif - -static struct addrinfo * -getanswer(const querybuf *answer, int anslen, const char *qname, int qtype, - const struct addrinfo *pai, res_state res) -{ - 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]; - - 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) { - RES_SET_H_ERRNO(res, NO_RECOVERY); - return (NULL); - } - n = dn_expand(answer->buf, eom, cp, bp, ep - bp); - if ((n < 0) || !(*name_ok)(bp)) { - RES_SET_H_ERRNO(res, 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) { - RES_SET_H_ERRNO(res, 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, 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) { -#ifdef DEBUG - if (type != T_KEY && type != T_SIG && - type != ns_t_dname) - 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; - } - - /* 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 defined(RESOLVSORT) - /* - * We support only IPv4 address for backward - * compatibility against gethostbyname(3). - */ - if (res->nsort && qtype == T_A) { - if (addr4sort(&sentinel, res) < 0) { - freeaddrinfo(sentinel.ai_next); - RES_SET_H_ERRNO(res, NO_RECOVERY); - return NULL; - } - } -#endif /*RESOLVSORT*/ - if (!canonname) - (void)get_canonname(pai, sentinel.ai_next, qname); - else - (void)get_canonname(pai, sentinel.ai_next, canonname); - RES_SET_H_ERRNO(res, NETDB_SUCCESS); - return sentinel.ai_next; - } - - RES_SET_H_ERRNO(res, NO_RECOVERY); - return NULL; -} - -#ifdef RESOLVSORT -struct addr_ptr { - struct addrinfo *ai; - int aval; -}; - -static int -addr4sort(struct addrinfo *sentinel, res_state res) -{ - struct addrinfo *ai; - struct addr_ptr *addrs, addr; - struct sockaddr_in *sin; - int naddrs, i, j; - int needsort = 0; - - if (!sentinel) - return -1; - naddrs = 0; - for (ai = sentinel->ai_next; ai; ai = ai->ai_next) - naddrs++; - if (naddrs < 2) - return 0; /* We don't need sorting. */ - if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL) - return -1; - i = 0; - for (ai = sentinel->ai_next; ai; ai = ai->ai_next) { - sin = (struct sockaddr_in *)ai->ai_addr; - for (j = 0; (unsigned)j < res->nsort; j++) { - if (res->sort_list[j].addr.s_addr == - (sin->sin_addr.s_addr & res->sort_list[j].mask)) - break; - } - addrs[i].ai = ai; - addrs[i].aval = j; - if (needsort == 0 && i > 0 && j < addrs[i - 1].aval) - needsort = i; - i++; - } - if (!needsort) { - free(addrs); - return 0; - } - - while (needsort < naddrs) { - for (j = needsort - 1; j >= 0; j--) { - if (addrs[j].aval > addrs[j+1].aval) { - addr = addrs[j]; - addrs[j] = addrs[j + 1]; - addrs[j + 1] = addr; - } else - break; - } - needsort++; - } - - ai = sentinel; - for (i = 0; i < naddrs; ++i) { - ai->ai_next = addrs[i].ai; - ai = ai->ai_next; - } - ai->ai_next = NULL; - free(addrs); - return 0; -} -#endif /*RESOLVSORT*/ - -/*ARGSUSED*/ -static int -_dns_getaddrinfo(void *rv, void *cb_data, va_list ap) -{ - struct addrinfo *ai; - querybuf *buf, *buf2; - const char *hostname; - const struct addrinfo *pai; - struct addrinfo sentinel, *cur; - struct res_target q, q2; - res_state res; - - hostname = va_arg(ap, char *); - pai = va_arg(ap, const struct addrinfo *); - - memset(&q, 0, sizeof(q)); - memset(&q2, 0, sizeof(q2)); - memset(&sentinel, 0, sizeof(sentinel)); - cur = &sentinel; - - buf = malloc(sizeof(*buf)); - if (!buf) { - RES_SET_H_ERRNO(res, NETDB_INTERNAL); - return NS_NOTFOUND; - } - buf2 = malloc(sizeof(*buf2)); - if (!buf2) { - free(buf); - RES_SET_H_ERRNO(res, NETDB_INTERNAL); - return NS_NOTFOUND; - } - - switch (pai->ai_family) { - case AF_UNSPEC: - q.name = hostname; - q.qclass = C_IN; - q.qtype = T_A; - q.answer = buf->buf; - q.anslen = sizeof(buf->buf); - q.next = &q2; - q2.name = hostname; - q2.qclass = C_IN; - q2.qtype = T_AAAA; - q2.answer = buf2->buf; - q2.anslen = sizeof(buf2->buf); - break; - case AF_INET: - q.name = hostname; - q.qclass = C_IN; - q.qtype = T_A; - q.answer = buf->buf; - q.anslen = sizeof(buf->buf); - break; - case AF_INET6: - q.name = hostname; - 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_state(); - if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) { - RES_SET_H_ERRNO(res, NETDB_INTERNAL); - free(buf); - free(buf2); - return NS_NOTFOUND; - } - - if (res_searchN(hostname, &q, res) < 0) { - free(buf); - free(buf2); - return NS_NOTFOUND; - } - /* prefer IPv6 */ - if (q.next) { - ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res); - if (ai) { - cur->ai_next = ai; - while (cur && cur->ai_next) - cur = cur->ai_next; - } - } - ai = getanswer(buf, q.n, q.name, q.qtype, pai, res); - if (ai) - cur->ai_next = ai; - free(buf); - free(buf2); - if (sentinel.ai_next == NULL) - switch (res->res_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(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]; - - if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "r"))) - return (NULL); -again: - if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf))) - return (NULL); - if (*p == '#') - goto again; - cp = strpbrk(p, "#\n"); - if (cp != NULL) - *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: - /* we should not glob socktype/protocol here */ - memset(&hints, 0, sizeof(hints)); - hints.ai_family = pai->ai_family; - hints.ai_socktype = SOCK_DGRAM; - hints.ai_protocol = 0; - hints.ai_flags = AI_NUMERICHOST; - error = getaddrinfo(addr, "0", &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; - res->ai_socktype = pai->ai_socktype; - res->ai_protocol = pai->ai_protocol; - - 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 *); - - 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; -} - -#ifdef YP -/*ARGSUSED*/ -static struct addrinfo * -_yphostent(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(void *rv, void *cb_data, va_list ap) -{ - struct addrinfo sentinel, *cur; - struct addrinfo *ai = NULL; - char *ypbuf; - int ypbuflen, r; - const char *name; - const struct addrinfo *pai; - char *ypdomain; - - if (_yp_check(&ypdomain) == 0) - return NS_UNAVAIL; - - name = va_arg(ap, char *); - pai = va_arg(ap, const struct addrinfo *); - - memset(&sentinel, 0, sizeof(sentinel)); - cur = &sentinel; - - /* 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), &ypbuf, &ypbuflen); - if (r == 0) { - struct addrinfo ai4; - - ai4 = *pai; - ai4.ai_family = AF_INET; - ai = _yphostent(ypbuf, &ai4); - if (ai) { - cur->ai_next = ai; - while (cur && cur->ai_next) - cur = cur->ai_next; - } - free(ypbuf); - } - } - - /* ipnodes.byname can hold both IPv4/v6 */ - r = yp_match(ypdomain, "ipnodes.byname", name, - (int)strlen(name), &ypbuf, &ypbuflen); - if (r == 0) { - ai = _yphostent(ypbuf, pai); - if (ai) - cur->ai_next = ai; - free(ypbuf); - } - - if (sentinel.ai_next == NULL) { - RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND); - return NS_NOTFOUND; - } - *((struct addrinfo **)rv) = sentinel.ai_next; - return NS_SUCCESS; -} -#endif - -/* 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, struct res_target *target, res_state res) -{ - u_char *buf; - HEADER *hp; - int n; - u_int oflags; - struct res_target *t; - int rcode; - int ancount; - - rcode = NOERROR; - ancount = 0; - - buf = malloc(MAXPACKET); - if (!buf) { - RES_SET_H_ERRNO(res, NETDB_INTERNAL); - return -1; - } - - for (t = target; t; t = t->next) { - int class, type; - u_char *answer; - int anslen; - - hp = (HEADER *)(void *)t->answer; - - /* make it easier... */ - class = t->qclass; - type = t->qtype; - answer = t->answer; - anslen = t->anslen; - - oflags = res->_flags; - -again: - hp->rcode = NOERROR; /* default */ - -#ifdef DEBUG - if (res->options & RES_DEBUG) - printf(";; res_query(%s, %d, %d)\n", name, class, type); -#endif - - n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL, - buf, MAXPACKET); - if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 && - (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U) - n = res_nopt(res, n, buf, MAXPACKET, anslen); - if (n <= 0) { -#ifdef DEBUG - if (res->options & RES_DEBUG) - printf(";; res_query: mkquery failed\n"); -#endif - free(buf); - RES_SET_H_ERRNO(res, NO_RECOVERY); - return (n); - } - n = res_nsend(res, buf, n, answer, anslen); - if (n < 0) { - /* - * if the query choked with EDNS0, retry - * without EDNS0 - */ - if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) - != 0U && - ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) { - res->_flags |= RES_F_EDNS0ERR; - if (res->options & RES_DEBUG) - printf(";; res_nquery: retry without EDNS0\n"); - goto again; - } - rcode = hp->rcode; /* record most recent error */ -#ifdef DEBUG - if (res->options & RES_DEBUG) - printf(";; res_query: send error\n"); -#endif - continue; - } - - if (n > anslen) - hp->rcode = FORMERR; /* XXX not very informative */ - if (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; - } - - free(buf); - - if (ancount == 0) { - switch (rcode) { - case NXDOMAIN: - RES_SET_H_ERRNO(res, HOST_NOT_FOUND); - break; - case SERVFAIL: - RES_SET_H_ERRNO(res, TRY_AGAIN); - break; - case NOERROR: - RES_SET_H_ERRNO(res, NO_DATA); - break; - case FORMERR: - case NOTIMP: - case REFUSED: - default: - RES_SET_H_ERRNO(res, 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 = (HEADER *)(void *)target->answer; /*XXX*/ - u_int dots; - int trailing_dot, ret, saved_herrno; - int got_nodata = 0, got_servfail = 0, root_on_list = 0; - int tried_as_is = 0; - int searched = 0; - char abuf[MAXDNAME]; - - errno = 0; - RES_SET_H_ERRNO(res, 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 = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL) - return (res_queryN(cp, target, res)); - - /* - * If there are enough dots in the name, let's just give it a - * try 'as is'. The threshold can be set with the "ndots" option. - * Also, query 'as is', if there is a trailing dot in the name. - */ - saved_herrno = -1; - if (dots >= res->ndots || trailing_dot) { - ret = res_querydomainN(name, NULL, target, res); - if (ret > 0 || trailing_dot) - return (ret); - if (errno == ECONNREFUSED) { - RES_SET_H_ERRNO(res, TRY_AGAIN); - return (-1); - } - switch (res->res_h_errno) { - case NO_DATA: - case HOST_NOT_FOUND: - break; - case TRY_AGAIN: - if (hp->rcode == SERVFAIL) - break; - /* FALLTHROUGH */ - default: - return (-1); - } - saved_herrno = res->res_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++) { - searched = 1; - - if (domain[0][0] == '\0' || - (domain[0][0] == '.' && domain[0][1] == '\0')) - root_on_list++; - - if (root_on_list && tried_as_is) - continue; - - 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) { - RES_SET_H_ERRNO(res, TRY_AGAIN); - return (-1); - } - - switch (res->res_h_errno) { - case NO_DATA: - got_nodata++; - /* FALLTHROUGH */ - case HOST_NOT_FOUND: - /* keep trying */ - break; - case TRY_AGAIN: - got_servfail++; - if (hp->rcode == SERVFAIL) { - /* try next search element, if any */ - 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++; - } - } - - switch (res->res_h_errno) { - case NO_DATA: - case HOST_NOT_FOUND: - break; - case TRY_AGAIN: - if (hp->rcode == SERVFAIL) - break; - /* FALLTHROUGH */ - default: - goto giveup; - } - - /* - * If the query has not already been tried as is then try it - * unless RES_NOTLDQUERY is set and there were no dots. - */ - if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) && - !(tried_as_is || root_on_list)) { - 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. - */ -giveup: - if (saved_herrno != -1) - RES_SET_H_ERRNO(res, saved_herrno); - else if (got_nodata) - RES_SET_H_ERRNO(res, NO_DATA); - else if (got_servfail) - RES_SET_H_ERRNO(res, 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; - -#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) { - RES_SET_H_ERRNO(res, 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) { - RES_SET_H_ERRNO(res, NO_RECOVERY); - return (-1); - } - snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain); - } - return (res_queryN(longname, target, res)); -} |
