diff options
Diffstat (limited to 'StdLib/BsdSocketLib/getaddrinfo.c')
| -rw-r--r-- | StdLib/BsdSocketLib/getaddrinfo.c | 1965 |
1 files changed, 0 insertions, 1965 deletions
diff --git a/StdLib/BsdSocketLib/getaddrinfo.c b/StdLib/BsdSocketLib/getaddrinfo.c deleted file mode 100644 index 5a0baf6d45..0000000000 --- a/StdLib/BsdSocketLib/getaddrinfo.c +++ /dev/null @@ -1,1965 +0,0 @@ -/* $NetBSD: getaddrinfo.c,v 1.91.6.1 2009/01/26 00:27:34 snj 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:
- * - 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:
- * - 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?
- */
-
-#include <sys/cdefs.h>
-#if defined(LIBC_SCCS) && !defined(lint)
-__RCSID("$NetBSD: getaddrinfo.c,v 1.91.6.1 2009/01/26 00:27:34 snj Exp $");
-#endif /* LIBC_SCCS and not lint */
-
-#define INET6 1
-
-#include "namespace.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.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <stdarg.h>
-#include <nsswitch.h>
-#include <resolv.h>
-
-//#ifdef YP
-//#include <rpc/rpc.h>
-//#include <rpcsvc/yp_prot.h>
-//#include <rpcsvc/ypclnt.h>
-//#endif
-
-#include <net/servent.h>
-
-#define endservent_r(svd) endservent()
-#define nsdispatch(pResult,dtab,database,routine,files,hostname,pai) NS_NOTFOUND
-#define res_nmkquery(state,op,dname,class,type,data,datalen,newrr_in,buf,buflen) res_mkquery( op, dname, class, type, data, datalen, newrr_in, buf, buflen )
-#define res_nsend(state,buf,buflen,ans,anssiz) res_send ( buf, buflen, ans, anssiz )
-
-/* Things involving an internal (static) resolver context. */
-__BEGIN_DECLS
-#define __res_get_state() (( 0 != _res.nscount ) ? &_res : NULL )
-#define __res_put_state(state)
-#define __res_state() _res
-__END_DECLS
-
-#ifdef __weak_alias
-__weak_alias(getaddrinfo,_getaddrinfo)
-__weak_alias(freeaddrinfo,_freeaddrinfo)
-__weak_alias(gai_strerror,_gai_strerror)
-#endif
-
-#define SUCCESS 0
-#define ANY 0
-#define YES 1
-#define NO 0
-
-static const char in_addrany[] = { 0, 0, 0, 0 };
-static const char 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 **, struct servent_data *);
-static int explore_null(const struct addrinfo *,
- const char *, struct addrinfo **, struct servent_data *);
-static int explore_numeric(const struct addrinfo *, const char *,
- const char *, struct addrinfo **, const char *, struct servent_data *);
-static int explore_numeric_scope(const struct addrinfo *, const char *,
- const char *, struct addrinfo **, struct servent_data *);
-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 *,
- struct servent_data *);
-static int get_port(const struct addrinfo *, const char *, int,
- struct servent_data *);
-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);
-#ifdef YP
-static struct addrinfo *_yphostent(char *, const struct addrinfo *);
-static int _yp_getaddrinfo(void *, void *, va_list);
-#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);
-
-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, svd) \
-do { \
- /* external reference: error and label free */ \
- error = get_port((ai), (serv), 0, (svd)); \
- 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;
-
- _DIAGASSERT(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;
-
- _DIAGASSERT(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;
- struct servent_data svd;
-
- /* hostname is allowed to be NULL */
- /* servname is allowed to be NULL */
- /* hints is allowed to be NULL */
- _DIAGASSERT(res != NULL);
-
- (void)memset(&svd, 0, sizeof(svd));
- memset(&sentinel, 0, sizeof(sentinel));
- cur = &sentinel;
- memset(&ai, 0, sizeof(ai));
- 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, &svd);
- 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,
- &svd);
- else
- error = explore_numeric_scope(pai, hostname, servname,
- &cur->ai_next, &svd);
-
- 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,
- &svd);
-
- while (cur && cur->ai_next)
- cur = cur->ai_next;
- }
-
- /* XXX */
- if (sentinel.ai_next)
- error = 0;
-
- if (error)
- goto free;
-
- if (sentinel.ai_next) {
- good:
- endservent_r(&svd);
- *res = sentinel.ai_next;
- return SUCCESS;
- } else
- error = EAI_FAIL;
- free:
- bad:
- endservent_r(&svd);
- if (sentinel.ai_next)
- freeaddrinfo(sentinel.ai_next);
- *res = NULL;
- return error;
-}
-
-static const ns_dtab dtab[] = {
- NS_FILES_CB(((nss_method)_files_getaddrinfo), NULL)
- { NSSRC_DNS, ((nss_method)_dns_getaddrinfo), NULL }, /* force -DHESIOD */
- NS_NIS_CB(_yp_getaddrinfo, NULL)
- NS_NULL_CB
-};
-
-/*
- * FQDN hostname, DNS lookup
- */
-static int
-explore_fqdn(const struct addrinfo *pai, const char *hostname,
- const char *servname, struct addrinfo **res, struct servent_data *svd)
-{
- struct addrinfo *result;
- struct addrinfo *cur;
- int error = 0;
-
- _DIAGASSERT(pai != NULL);
- /* hostname may be NULL */
- /* servname may be NULL */
- _DIAGASSERT(res != NULL);
-
- result = NULL;
-
- /*
- * if the servname does not match socktype/protocol, ignore it.
- */
- if (get_portmatch(pai, servname, svd) != 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, svd);
- /* 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, struct servent_data *svd)
-{
- int s;
- const struct afd *afd;
- struct addrinfo *cur;
- struct addrinfo sentinel;
- int error;
-
- _DIAGASSERT(pai != NULL);
- /* servname may be NULL */
- _DIAGASSERT(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, svd) != 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, svd);
- } else {
- GET_AI(cur->ai_next, afd, afd->a_loopback);
- /* xxx meaningless?
- * GET_CANONNAME(cur->ai_next, "localhost");
- */
- GET_PORT(cur->ai_next, servname, svd);
- }
- 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,
- struct servent_data *svd)
-{
- const struct afd *afd;
- struct addrinfo *cur;
- struct addrinfo sentinel;
- int error;
- char pton[PTON_MAX];
-
- _DIAGASSERT(pai != NULL);
- /* hostname may be NULL */
- /* servname may be NULL */
- _DIAGASSERT(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, svd) != 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, svd);
- 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, svd);
- 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, struct servent_data *svd)
-{
-#if !defined(SCOPE_DELIMITER) || !defined(INET6)
- return explore_numeric(pai, hostname, servname, res, hostname, svd);
-#else
- const struct afd *afd;
- struct addrinfo *cur;
- int error;
- char *cp, *hostname2 = NULL, *scope, *addr;
- struct sockaddr_in6 *sin6;
-
- _DIAGASSERT(pai != NULL);
- /* hostname may be NULL */
- /* servname may be NULL */
- _DIAGASSERT(res != NULL);
-
- /*
- * if the servname does not match socktype/protocol, ignore it.
- */
- if (get_portmatch(pai, servname, svd) != 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,
- svd);
-
- cp = strchr(hostname, SCOPE_DELIMITER);
- if (cp == NULL)
- return explore_numeric(pai, hostname, servname, res, hostname,
- svd);
-
- /*
- * 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, svd);
- 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)
-{
-
- _DIAGASSERT(pai != NULL);
- _DIAGASSERT(ai != NULL);
- _DIAGASSERT(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;
-
- _DIAGASSERT(pai != NULL);
- _DIAGASSERT(afd != NULL);
- _DIAGASSERT(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);
- ai->ai_addr->sa_len = (uint8_t)afd->a_socklen;
- ai->ai_addrlen = afd->a_socklen;
- ai->ai_family = afd->a_af;
- ai->ai_addr->sa_family = (sa_family_t)ai->ai_family;
- 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,
- struct servent_data *svd)
-{
-
- _DIAGASSERT(ai != NULL);
- /* servname may be NULL */
-
- return get_port(ai, servname, 1, svd);
-}
-
-static int
-get_port(const struct addrinfo *ai, const char *servname, int matchonly,
- struct servent_data *svd)
-{
- const char *proto;
- struct servent *sp;
- int port;
- int allownumeric;
-
- _DIAGASSERT(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:
- /*
- * This was 0. It is now 1 so that queries specifying
- * a NULL hint, or hint without socktype (but, hopefully,
- * with protocol) and numeric address actually work.
- */
- allownumeric = 1;
- 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 {
-// struct servent sv;
- 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;
- }
-
-// sp = getservbyname_r(servname, proto, &sv, svd);
- sp = getservbyname ( servname, proto );
- if (sp == 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 = (in_port_t)port;
- break;
-#ifdef INET6
- case AF_INET6:
- ((struct sockaddr_in6 *)(void *)
- ai->ai_addr)->sin6_port = (in_port_t)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;
-
- _DIAGASSERT(scope != NULL);
- _DIAGASSERT(sin6 != NULL);
- _DIAGASSERT(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;
-*/
- return -1;
- }
-
- /* 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 *);
- static char hostbuf[8*1024];
-
- _DIAGASSERT(answer != NULL);
- _DIAGASSERT(qname != NULL);
- _DIAGASSERT(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, (int)(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 = (int)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, (int)(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 = (int)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) {
-#ifdef _ORG_FREEBSD_
- struct syslog_data sd = SYSLOG_DATA_INIT;
- syslog_r(LOG_NOTICE|LOG_AUTH, &sd,
- "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 _ORG_FREEBSD_
- struct syslog_data sd = SYSLOG_DATA_INIT;
- syslog_r(LOG_NOTICE|LOG_AUTH, &sd,
- 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;
- }
- 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 = (int)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 < (int)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 *);
-
- 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;
- static char hostbuf[8*1024];
-
- _DIAGASSERT(name != NULL);
- _DIAGASSERT(pai != NULL);
-
- if (!*hostf && ( NULL == (*hostf = fopen(_PATH_HOSTS, "r" ))))
- return (NULL);
- again:
- if ( NULL == (p = fgets(hostbuf, sizeof hostbuf, *hostf)))
- return (NULL);
- if (*p == '#')
- goto again;
- if ( NULL == (cp = strpbrk(p, "#\n")))
- goto again;
- *cp = '\0';
- if ( NULL == (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';
- 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;
-#ifndef _REENTRANT
- static
-#endif
- FILE *hostf = NULL;
-
- name = va_arg(ap, char *);
- pai = va_arg(ap, const 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;
- const char *addr, *canonname;
- char *nextline;
- char *cp;
-
- _DIAGASSERT(line != NULL);
- _DIAGASSERT(pai != NULL);
-
- p = line;
- 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->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) {
- h_errno = 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, /* domain name */ struct res_target *target,
- res_state res)
-{
- static u_char buf[MAXPACKET];
- HEADER *hp;
- int n;
- struct res_target *t;
- int rcode;
- int ancount;
-
- _DIAGASSERT(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;
-
- _DIAGASSERT(name != NULL);
- _DIAGASSERT(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++;
-
- /*
- * 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;
-
- _DIAGASSERT(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);
-}
|