getaddrinfo.c revision 111618
162836Sitojun/*	$KAME: getaddrinfo.c,v 1.15 2000/07/09 04:37:24 itojun Exp $	*/
262614Sitojun
355163Sshin/*
455163Sshin * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
555163Sshin * All rights reserved.
655163Sshin *
755163Sshin * Redistribution and use in source and binary forms, with or without
855163Sshin * modification, are permitted provided that the following conditions
955163Sshin * are met:
1055163Sshin * 1. Redistributions of source code must retain the above copyright
1155163Sshin *    notice, this list of conditions and the following disclaimer.
1255163Sshin * 2. Redistributions in binary form must reproduce the above copyright
1355163Sshin *    notice, this list of conditions and the following disclaimer in the
1455163Sshin *    documentation and/or other materials provided with the distribution.
1555163Sshin * 3. Neither the name of the project nor the names of its contributors
1655163Sshin *    may be used to endorse or promote products derived from this software
1755163Sshin *    without specific prior written permission.
1855163Sshin *
1955163Sshin * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
2055163Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2155163Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2255163Sshin * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
2355163Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2455163Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2555163Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2655163Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2755163Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2855163Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2955163Sshin * SUCH DAMAGE.
3055163Sshin */
3155163Sshin
3255163Sshin/*
3355163Sshin * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
3455163Sshin *
3555163Sshin * Issues to be discussed:
3655163Sshin * - Thread safe-ness must be checked.
3755163Sshin * - Return values.  There are nonstandard return values defined and used
3855163Sshin *   in the source code.  This is because RFC2553 is silent about which error
3955163Sshin *   code must be returned for which situation.
4061877Sume * - freeaddrinfo(NULL).  RFC2553 is silent about it.  XNET 5.2 says it is
41105940Sume *   invalid.  current code - SEGV on freeaddrinfo(NULL)
42105940Sume *
4356627Sshin * Note:
4456627Sshin * - The code filters out AFs that are not supported by the kernel,
4556627Sshin *   when globbing NULL hostname (to loopback, or wildcard).  Is it the right
4656627Sshin *   thing to do?  What is the relationship with post-RFC2553 AI_ADDRCONFIG
4756627Sshin *   in ai_flags?
4861877Sume * - (post-2553) semantics of AI_ADDRCONFIG itself is too vague.
4961877Sume *   (1) what should we do against numeric hostname (2) what should we do
5061877Sume *   against NULL hostname (3) what is AI_ADDRCONFIG itself.  AF not ready?
5161877Sume *   non-loopback address configured?  global address configured?
52105940Sume *
53105940Sume * OS specific notes for netbsd/openbsd/freebsd4/bsdi4:
5461877Sume * - To avoid search order issue, we have a big amount of code duplicate
5561877Sume *   from gethnamaddr.c and some other places.  The issues that there's no
5661877Sume *   lower layer function to lookup "IPv4 or IPv6" record.  Calling
5761877Sume *   gethostbyname2 from getaddrinfo will end up in wrong search order, as
58105940Sume *   presented above.
59105940Sume *
60105940Sume * OS specific notes for freebsd4:
61105940Sume * - FreeBSD supported $GAI.  The code does not.
62105940Sume * - FreeBSD allowed classful IPv4 numeric (127.1), the code does not.
6355163Sshin */
6455163Sshin
6592986Sobrien#include <sys/cdefs.h>
6692986Sobrien__FBSDID("$FreeBSD: head/lib/libc/net/getaddrinfo.c 111618 2003-02-27 13:40:01Z nectar $");
6792986Sobrien
6871579Sdeischen#include "namespace.h"
6955163Sshin#include <sys/types.h>
7055163Sshin#include <sys/param.h>
7155163Sshin#include <sys/socket.h>
7255163Sshin#include <net/if.h>
7355163Sshin#include <netinet/in.h>
7455163Sshin#include <arpa/inet.h>
7555163Sshin#include <arpa/nameser.h>
7690271Salfred#include <rpc/rpc.h>
7790271Salfred#include <rpcsvc/yp_prot.h>
7890271Salfred#include <rpcsvc/ypclnt.h>
7955163Sshin#include <netdb.h>
8055163Sshin#include <resolv.h>
8155163Sshin#include <string.h>
8255163Sshin#include <stdlib.h>
8355163Sshin#include <stddef.h>
8455163Sshin#include <ctype.h>
8555163Sshin#include <unistd.h>
8655163Sshin#include <stdio.h>
8761877Sume#include <errno.h>
88102237Spirzyk
89102237Spirzyk#include "res_config.h"
90102237Spirzyk
9178012Sume#ifdef DEBUG
9278012Sume#include <syslog.h>
9378012Sume#endif
9455163Sshin
9565532Snectar#include <stdarg.h>
9665532Snectar#include <nsswitch.h>
9771579Sdeischen#include "un-namespace.h"
98111618Snectar#include "libc_private.h"
9965532Snectar
10055163Sshin#if defined(__KAME__) && defined(INET6)
10155163Sshin# define FAITH
10255163Sshin#endif
10355163Sshin
104105940Sume#define SUCCESS 0
105105940Sume#define ANY 0
106105940Sume#define YES 1
107105940Sume#define NO  0
10855163Sshin
10955163Sshinstatic const char in_addrany[] = { 0, 0, 0, 0 };
110105940Sumestatic const char in_loopback[] = { 127, 0, 0, 1 };
111105940Sume#ifdef INET6
11255163Sshinstatic const char in6_addrany[] = {
11355163Sshin	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
11455163Sshin};
11555163Sshinstatic const char in6_loopback[] = {
11655163Sshin	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
11755163Sshin};
118105940Sume#endif
11955163Sshin
12055163Sshinstatic const struct afd {
12155163Sshin	int a_af;
12255163Sshin	int a_addrlen;
12355163Sshin	int a_socklen;
12455163Sshin	int a_off;
12555163Sshin	const char *a_addrany;
12673665Sobrien	const char *a_loopback;
12755163Sshin	int a_scoped;
12855163Sshin} afdl [] = {
12955163Sshin#ifdef INET6
13055163Sshin#define	N_INET6 0
13155163Sshin	{PF_INET6, sizeof(struct in6_addr),
13255163Sshin	 sizeof(struct sockaddr_in6),
13355163Sshin	 offsetof(struct sockaddr_in6, sin6_addr),
13455163Sshin	 in6_addrany, in6_loopback, 1},
13555163Sshin#define	N_INET 1
13655163Sshin#else
13755163Sshin#define	N_INET 0
13855163Sshin#endif
13955163Sshin	{PF_INET, sizeof(struct in_addr),
14055163Sshin	 sizeof(struct sockaddr_in),
14155163Sshin	 offsetof(struct sockaddr_in, sin_addr),
14255163Sshin	 in_addrany, in_loopback, 0},
14355163Sshin	{0, 0, 0, 0, NULL, NULL, 0},
14455163Sshin};
14555163Sshin
14655163Sshinstruct explore {
14761877Sume	int e_af;
14855163Sshin	int e_socktype;
14955163Sshin	int e_protocol;
15055163Sshin	const char *e_protostr;
15155163Sshin	int e_wild;
152105940Sume#define WILD_AF(ex)		((ex)->e_wild & 0x01)
153105940Sume#define WILD_SOCKTYPE(ex)	((ex)->e_wild & 0x02)
154105940Sume#define WILD_PROTOCOL(ex)	((ex)->e_wild & 0x04)
15555163Sshin};
15655163Sshin
15755163Sshinstatic const struct explore explore[] = {
15861877Sume#if 0
15961877Sume	{ PF_LOCAL, 0, ANY, ANY, NULL, 0x01 },
16061877Sume#endif
16161877Sume#ifdef INET6
16261877Sume	{ PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
16361877Sume	{ PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
16461877Sume	{ PF_INET6, SOCK_RAW, ANY, NULL, 0x05 },
16561877Sume#endif
16661877Sume	{ PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
16761877Sume	{ PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
16861877Sume	{ PF_INET, SOCK_RAW, ANY, NULL, 0x05 },
16961877Sume	{ PF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
17061877Sume	{ PF_UNSPEC, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
17161877Sume	{ PF_UNSPEC, SOCK_RAW, ANY, NULL, 0x05 },
17261877Sume	{ -1, 0, 0, NULL, 0 },
17355163Sshin};
17455163Sshin
17555163Sshin#ifdef INET6
176105940Sume#define PTON_MAX	16
17755163Sshin#else
178105940Sume#define PTON_MAX	4
17955163Sshin#endif
18055163Sshin
18165532Snectarstatic const ns_src default_dns_files[] = {
18265532Snectar	{ NSSRC_FILES, 	NS_SUCCESS },
18365532Snectar	{ NSSRC_DNS, 	NS_SUCCESS },
18465532Snectar	{ 0 }
18565532Snectar};
18665532Snectar
187103357Sume#define MAXPACKET	(64*1024)
18861877Sume
18961877Sumetypedef union {
19061877Sume	HEADER hdr;
19161877Sume	u_char buf[MAXPACKET];
19261877Sume} querybuf;
19361877Sume
19461877Sumestruct res_target {
19561877Sume	struct res_target *next;
19661877Sume	const char *name;	/* domain name */
19762614Sitojun	int qclass, qtype;	/* class and type of query */
19861877Sume	u_char *answer;		/* buffer to put answer */
19961877Sume	int anslen;		/* size of answer buffer */
20061877Sume	int n;			/* result length */
20161877Sume};
20261877Sume
20392905Sobrienstatic int str_isnumber(const char *);
20492941Sobrienstatic int explore_fqdn(const struct addrinfo *, const char *,
20592941Sobrien	const char *, struct addrinfo **);
20692941Sobrienstatic int explore_null(const struct addrinfo *,
20792941Sobrien	const char *, struct addrinfo **);
20892941Sobrienstatic int explore_numeric(const struct addrinfo *, const char *,
20992941Sobrien	const char *, struct addrinfo **);
21092941Sobrienstatic int explore_numeric_scope(const struct addrinfo *, const char *,
21192941Sobrien	const char *, struct addrinfo **);
21292941Sobrienstatic int get_canonname(const struct addrinfo *,
21392941Sobrien	struct addrinfo *, const char *);
21492941Sobrienstatic struct addrinfo *get_ai(const struct addrinfo *,
21592941Sobrien	const struct afd *, const char *);
21692905Sobrienstatic int get_portmatch(const struct addrinfo *, const char *);
21792905Sobrienstatic int get_port(struct addrinfo *, const char *, int);
21892905Sobrienstatic const struct afd *find_afd(int);
21992905Sobrienstatic int addrconfig(struct addrinfo *);
22061877Sume#ifdef INET6
221105943Sumestatic int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);
22261877Sume#endif
22355163Sshin
22492941Sobrienstatic struct addrinfo *getanswer(const querybuf *, int, const char *, int,
22592941Sobrien	const struct addrinfo *);
226105943Sumestatic int _dns_getaddrinfo(void *, void *, va_list);
22792905Sobrienstatic void _sethtent(void);
22892905Sobrienstatic void _endhtent(void);
22992905Sobrienstatic struct addrinfo *_gethtent(const char *, const struct addrinfo *);
23092905Sobrienstatic int _files_getaddrinfo(void *, void *, va_list);
23161877Sume#ifdef YP
23292905Sobrienstatic struct addrinfo *_yphostent(char *, const struct addrinfo *);
23392905Sobrienstatic int _yp_getaddrinfo(void *, void *, va_list);
23461877Sume#endif
23561877Sume
23692905Sobrienstatic int res_queryN(const char *, struct res_target *);
23792905Sobrienstatic int res_searchN(const char *, struct res_target *);
23892941Sobrienstatic int res_querydomainN(const char *, const char *,
23992941Sobrien	struct res_target *);
24061877Sume
24155163Sshinstatic char *ai_errlist[] = {
24255163Sshin	"Success",
24355163Sshin	"Address family for hostname not supported",	/* EAI_ADDRFAMILY */
24455163Sshin	"Temporary failure in name resolution",		/* EAI_AGAIN      */
24555163Sshin	"Invalid value for ai_flags",		       	/* EAI_BADFLAGS   */
24655163Sshin	"Non-recoverable failure in name resolution", 	/* EAI_FAIL       */
24755163Sshin	"ai_family not supported",			/* EAI_FAMILY     */
24855163Sshin	"Memory allocation failure", 			/* EAI_MEMORY     */
24955163Sshin	"No address associated with hostname", 		/* EAI_NODATA     */
25055163Sshin	"hostname nor servname provided, or not known",	/* EAI_NONAME     */
25155163Sshin	"servname not supported for ai_socktype",	/* EAI_SERVICE    */
25255163Sshin	"ai_socktype not supported", 			/* EAI_SOCKTYPE   */
25355163Sshin	"System error returned in errno", 		/* EAI_SYSTEM     */
25455163Sshin	"Invalid value for hints",			/* EAI_BADHINTS	  */
25555163Sshin	"Resolved protocol is unknown",			/* EAI_PROTOCOL   */
25655163Sshin	"Unknown error", 				/* EAI_MAX        */
25755163Sshin};
25855163Sshin
259104558Sume/* Make getaddrinfo() thread-safe in libc for use with kernel threads. */
260104558Sume#include "libc_private.h"
261104558Sume#include "spinlock.h"
262104558Sume/*
263104558Sume * XXX: Our res_*() is not thread-safe.  So, we share lock between
264104558Sume * getaddrinfo() and getipnodeby*().  Still, we cannot use
265104558Sume * getaddrinfo() and getipnodeby*() in conjunction with other
266104558Sume * functions which call res_*().
267104558Sume */
268104558Sumespinlock_t __getaddrinfo_thread_lock = _SPINLOCK_INITIALIZER;
269104558Sume#define THREAD_LOCK() \
270104558Sume	if (__isthreaded) _SPINLOCK(&__getaddrinfo_thread_lock);
271104558Sume#define THREAD_UNLOCK() \
272104558Sume	if (__isthreaded) _SPINUNLOCK(&__getaddrinfo_thread_lock);
273104558Sume
27455163Sshin/* XXX macros that make external reference is BAD. */
27555163Sshin
276105940Sume#define GET_AI(ai, afd, addr) \
27755163Sshindo { \
27855163Sshin	/* external reference: pai, error, and label free */ \
27955163Sshin	(ai) = get_ai(pai, (afd), (addr)); \
28055163Sshin	if ((ai) == NULL) { \
28155163Sshin		error = EAI_MEMORY; \
28255163Sshin		goto free; \
28355163Sshin	} \
28461877Sume} while (/*CONSTCOND*/0)
28555163Sshin
286105940Sume#define GET_PORT(ai, serv) \
28755163Sshindo { \
28855163Sshin	/* external reference: error and label free */ \
28955163Sshin	error = get_port((ai), (serv), 0); \
29055163Sshin	if (error != 0) \
29155163Sshin		goto free; \
29261877Sume} while (/*CONSTCOND*/0)
29355163Sshin
294105940Sume#define GET_CANONNAME(ai, str) \
29555163Sshindo { \
29655163Sshin	/* external reference: pai, error and label free */ \
29755163Sshin	error = get_canonname(pai, (ai), (str)); \
29855163Sshin	if (error != 0) \
29955163Sshin		goto free; \
30061877Sume} while (/*CONSTCOND*/0)
30155163Sshin
302105940Sume#define ERR(err) \
30355163Sshindo { \
30455163Sshin	/* external reference: error, and label bad */ \
30555163Sshin	error = (err); \
30655163Sshin	goto bad; \
30761877Sume	/*NOTREACHED*/ \
30861877Sume} while (/*CONSTCOND*/0)
30955163Sshin
310105940Sume#define MATCH_FAMILY(x, y, w) \
31161877Sume	((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
312105940Sume#define MATCH(x, y, w) \
31361877Sume	((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
31455163Sshin
31555163Sshinchar *
31655163Sshingai_strerror(ecode)
31755163Sshin	int ecode;
31855163Sshin{
31955163Sshin	if (ecode < 0 || ecode > EAI_MAX)
32055163Sshin		ecode = EAI_MAX;
32155163Sshin	return ai_errlist[ecode];
32255163Sshin}
32355163Sshin
32455163Sshinvoid
32555163Sshinfreeaddrinfo(ai)
32655163Sshin	struct addrinfo *ai;
32755163Sshin{
32855163Sshin	struct addrinfo *next;
32955163Sshin
33055163Sshin	do {
33155163Sshin		next = ai->ai_next;
33255163Sshin		if (ai->ai_canonname)
33355163Sshin			free(ai->ai_canonname);
33455163Sshin		/* no need to free(ai->ai_addr) */
33555163Sshin		free(ai);
33661877Sume		ai = next;
33761877Sume	} while (ai);
33855163Sshin}
33955163Sshin
34055163Sshinstatic int
34155163Sshinstr_isnumber(p)
34255163Sshin	const char *p;
34355163Sshin{
34462836Sitojun	char *ep;
34562836Sitojun
34662836Sitojun	if (*p == '\0')
34762836Sitojun		return NO;
34862836Sitojun	ep = NULL;
349105943Sume	errno = 0;
35062836Sitojun	(void)strtoul(p, &ep, 10);
351105943Sume	if (errno == 0 && ep && *ep == '\0')
35262836Sitojun		return YES;
35362836Sitojun	else
35462836Sitojun		return NO;
35555163Sshin}
35655163Sshin
35755163Sshinint
35855163Sshingetaddrinfo(hostname, servname, hints, res)
35955163Sshin	const char *hostname, *servname;
36055163Sshin	const struct addrinfo *hints;
36155163Sshin	struct addrinfo **res;
36255163Sshin{
36355163Sshin	struct addrinfo sentinel;
36455163Sshin	struct addrinfo *cur;
36555163Sshin	int error = 0;
36655163Sshin	struct addrinfo ai;
36755163Sshin	struct addrinfo ai0;
36855163Sshin	struct addrinfo *pai;
36955163Sshin	const struct explore *ex;
37055163Sshin
37161877Sume	memset(&sentinel, 0, sizeof(sentinel));
37255163Sshin	cur = &sentinel;
37355163Sshin	pai = &ai;
37455163Sshin	pai->ai_flags = 0;
37555163Sshin	pai->ai_family = PF_UNSPEC;
37655163Sshin	pai->ai_socktype = ANY;
37755163Sshin	pai->ai_protocol = ANY;
37855163Sshin	pai->ai_addrlen = 0;
37955163Sshin	pai->ai_canonname = NULL;
38055163Sshin	pai->ai_addr = NULL;
38155163Sshin	pai->ai_next = NULL;
38255163Sshin
38355163Sshin	if (hostname == NULL && servname == NULL)
38455163Sshin		return EAI_NONAME;
38555163Sshin	if (hints) {
38655163Sshin		/* error check for hints */
38755163Sshin		if (hints->ai_addrlen || hints->ai_canonname ||
38855163Sshin		    hints->ai_addr || hints->ai_next)
38955163Sshin			ERR(EAI_BADHINTS); /* xxx */
39055163Sshin		if (hints->ai_flags & ~AI_MASK)
39155163Sshin			ERR(EAI_BADFLAGS);
39255163Sshin		switch (hints->ai_family) {
39355163Sshin		case PF_UNSPEC:
39455163Sshin		case PF_INET:
39555163Sshin#ifdef INET6
39655163Sshin		case PF_INET6:
39755163Sshin#endif
39855163Sshin			break;
39955163Sshin		default:
40055163Sshin			ERR(EAI_FAMILY);
40155163Sshin		}
40255163Sshin		memcpy(pai, hints, sizeof(*pai));
40355163Sshin
40455163Sshin		/*
40555163Sshin		 * if both socktype/protocol are specified, check if they
40655163Sshin		 * are meaningful combination.
40755163Sshin		 */
40855163Sshin		if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
40961877Sume			for (ex = explore; ex->e_af >= 0; ex++) {
41061877Sume				if (pai->ai_family != ex->e_af)
41161877Sume					continue;
41255163Sshin				if (ex->e_socktype == ANY)
41355163Sshin					continue;
41455163Sshin				if (ex->e_protocol == ANY)
41555163Sshin					continue;
416105940Sume				if (pai->ai_socktype == ex->e_socktype &&
417105940Sume				    pai->ai_protocol != ex->e_protocol) {
41855163Sshin					ERR(EAI_BADHINTS);
41961877Sume				}
42055163Sshin			}
42155163Sshin		}
42255163Sshin	}
42355163Sshin
42461877Sume	/*
42561877Sume	 * post-2553: AI_ALL and AI_V4MAPPED are effective only against
426105940Sume	 * AF_INET6 query.  They need to be ignored if specified in other
42761877Sume	 * occassions.
42861877Sume	 */
42961877Sume	switch (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) {
43061877Sume	case AI_V4MAPPED:
43161877Sume	case AI_ALL | AI_V4MAPPED:
43261877Sume		if (pai->ai_family != AF_INET6)
43361877Sume			pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
43461877Sume		break;
43561877Sume	case AI_ALL:
43661877Sume#if 1
43761877Sume		/* illegal */
43861877Sume		ERR(EAI_BADFLAGS);
43961877Sume#else
44061877Sume		pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
44161877Sume#endif
44261877Sume		break;
44361877Sume	}
44455163Sshin
44555163Sshin	/*
44661877Sume	 * check for special cases.  (1) numeric servname is disallowed if
44761877Sume	 * socktype/protocol are left unspecified. (2) servname is disallowed
44861877Sume	 * for raw and other inet{,6} sockets.
44955163Sshin	 */
45055163Sshin	if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
45161877Sume#ifdef PF_INET6
45273665Sobrien	    || MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
45355163Sshin#endif
45455163Sshin	    ) {
45561877Sume		ai0 = *pai;	/* backup *pai */
45655163Sshin
45761877Sume		if (pai->ai_family == PF_UNSPEC) {
45861877Sume#ifdef PF_INET6
45955163Sshin			pai->ai_family = PF_INET6;
46055163Sshin#else
46155163Sshin			pai->ai_family = PF_INET;
46255163Sshin#endif
46361877Sume		}
46455163Sshin		error = get_portmatch(pai, servname);
46555163Sshin		if (error)
46655163Sshin			ERR(error);
46761877Sume
46861877Sume		*pai = ai0;
46955163Sshin	}
47055163Sshin
47161877Sume	ai0 = *pai;
47261877Sume
47355163Sshin	/* NULL hostname, or numeric hostname */
47461877Sume	for (ex = explore; ex->e_af >= 0; ex++) {
47555163Sshin		*pai = ai0;
47655163Sshin
47761877Sume		/* PF_UNSPEC entries are prepared for DNS queries only */
47861877Sume		if (ex->e_af == PF_UNSPEC)
47955163Sshin			continue;
48061877Sume
48161877Sume		if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
48255163Sshin			continue;
48365532Snectar		if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex)))
48455163Sshin			continue;
48565532Snectar		if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex)))
48661877Sume			continue;
48755163Sshin
48855163Sshin		if (pai->ai_family == PF_UNSPEC)
48961877Sume			pai->ai_family = ex->e_af;
49055163Sshin		if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
49155163Sshin			pai->ai_socktype = ex->e_socktype;
49255163Sshin		if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
49355163Sshin			pai->ai_protocol = ex->e_protocol;
49455163Sshin
49555163Sshin		if (hostname == NULL)
49661877Sume			error = explore_null(pai, servname, &cur->ai_next);
49755163Sshin		else
49865532Snectar			error = explore_numeric_scope(pai, hostname, servname, &cur->ai_next);
49955163Sshin
50055163Sshin		if (error)
50155163Sshin			goto free;
50255163Sshin
50355163Sshin		while (cur && cur->ai_next)
50455163Sshin			cur = cur->ai_next;
50555163Sshin	}
50655163Sshin
50755163Sshin	/*
50855163Sshin	 * XXX
50955163Sshin	 * If numreic representation of AF1 can be interpreted as FQDN
51055163Sshin	 * representation of AF2, we need to think again about the code below.
51155163Sshin	 */
51255163Sshin	if (sentinel.ai_next)
51355163Sshin		goto good;
51455163Sshin
51555163Sshin	if (pai->ai_flags & AI_NUMERICHOST)
51690053Sroam		ERR(EAI_NONAME);
51755163Sshin	if (hostname == NULL)
51862614Sitojun		ERR(EAI_NODATA);
51955163Sshin
52061877Sume	if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0))
52161877Sume		ERR(EAI_FAIL);
52255163Sshin
52361877Sume	/*
52461877Sume	 * hostname as alphabetical name.
52561877Sume	 * we would like to prefer AF_INET6 than AF_INET, so we'll make a
52661877Sume	 * outer loop by AFs.
52761877Sume	 */
52861877Sume	for (ex = explore; ex->e_af >= 0; ex++) {
52961877Sume		*pai = ai0;
53055163Sshin
53161877Sume		/* require exact match for family field */
53261877Sume		if (pai->ai_family != ex->e_af)
53361877Sume			continue;
53455163Sshin
53561877Sume		if (!MATCH(pai->ai_socktype, ex->e_socktype,
53665532Snectar				WILD_SOCKTYPE(ex))) {
53761877Sume			continue;
53861877Sume		}
53961877Sume		if (!MATCH(pai->ai_protocol, ex->e_protocol,
54065532Snectar				WILD_PROTOCOL(ex))) {
54161877Sume			continue;
54261877Sume		}
54355163Sshin
54461877Sume		if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
54561877Sume			pai->ai_socktype = ex->e_socktype;
54661877Sume		if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
54761877Sume			pai->ai_protocol = ex->e_protocol;
54861877Sume
54965532Snectar		error = explore_fqdn(pai, hostname, servname,
55065532Snectar			&cur->ai_next);
55161877Sume
55261877Sume		while (cur && cur->ai_next)
55361877Sume			cur = cur->ai_next;
55455163Sshin	}
55555163Sshin
55661877Sume	/* XXX */
55761877Sume	if (sentinel.ai_next)
55861877Sume		error = 0;
55961877Sume
56061877Sume	if (error)
56161877Sume		goto free;
56261877Sume	if (error == 0) {
56361877Sume		if (sentinel.ai_next) {
56455163Sshin good:
56561877Sume			*res = sentinel.ai_next;
56661877Sume			return SUCCESS;
56761877Sume		} else
56861877Sume			error = EAI_FAIL;
56955163Sshin	}
57055163Sshin free:
57155163Sshin bad:
57255163Sshin	if (sentinel.ai_next)
57355163Sshin		freeaddrinfo(sentinel.ai_next);
57455163Sshin	*res = NULL;
57555163Sshin	return error;
57655163Sshin}
57755163Sshin
57855163Sshin/*
57955163Sshin * FQDN hostname, DNS lookup
58055163Sshin */
58155163Sshinstatic int
58255163Sshinexplore_fqdn(pai, hostname, servname, res)
58355163Sshin	const struct addrinfo *pai;
58455163Sshin	const char *hostname;
58555163Sshin	const char *servname;
58655163Sshin	struct addrinfo **res;
58755163Sshin{
58861877Sume	struct addrinfo *result;
58961877Sume	struct addrinfo *cur;
59065532Snectar	int error = 0;
59165532Snectar	static const ns_dtab dtab[] = {
59265532Snectar		NS_FILES_CB(_files_getaddrinfo, NULL)
59365532Snectar		{ NSSRC_DNS, _dns_getaddrinfo, NULL },	/* force -DHESIOD */
59465532Snectar		NS_NIS_CB(_yp_getaddrinfo, NULL)
59565532Snectar		{ 0 }
59665532Snectar	};
59755163Sshin
59861877Sume	result = NULL;
59955163Sshin
600104558Sume	THREAD_LOCK();
601104558Sume
60255163Sshin	/*
60355163Sshin	 * if the servname does not match socktype/protocol, ignore it.
60455163Sshin	 */
605104558Sume	if (get_portmatch(pai, servname) != 0) {
606104558Sume		THREAD_UNLOCK();
60755163Sshin		return 0;
608104558Sume	}
60955163Sshin
61065532Snectar	switch (nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
61165532Snectar			default_dns_files, hostname, pai)) {
61265532Snectar	case NS_TRYAGAIN:
61365532Snectar		error = EAI_AGAIN;
61465532Snectar		goto free;
61565532Snectar	case NS_UNAVAIL:
61665532Snectar		error = EAI_FAIL;
61765532Snectar		goto free;
61865532Snectar	case NS_NOTFOUND:
61965532Snectar		error = EAI_NODATA;
62065532Snectar		goto free;
62165532Snectar	case NS_SUCCESS:
62265532Snectar		error = 0;
62361877Sume		for (cur = result; cur; cur = cur->ai_next) {
62461877Sume			GET_PORT(cur, servname);
62561877Sume			/* canonname should be filled already */
62655163Sshin		}
62765532Snectar		break;
62855163Sshin	}
629104558Sume	THREAD_UNLOCK();
63055163Sshin
63165532Snectar	*res = result;
63265532Snectar
63365532Snectar	return 0;
63465532Snectar
63555163Sshinfree:
636104558Sume	THREAD_UNLOCK();
63761877Sume	if (result)
63861877Sume		freeaddrinfo(result);
63955163Sshin	return error;
64055163Sshin}
64155163Sshin
64255163Sshin/*
64355163Sshin * hostname == NULL.
64455163Sshin * passive socket -> anyaddr (0.0.0.0 or ::)
64555163Sshin * non-passive socket -> localhost (127.0.0.1 or ::1)
64655163Sshin */
64755163Sshinstatic int
64861877Sumeexplore_null(pai, servname, res)
64955163Sshin	const struct addrinfo *pai;
65055163Sshin	const char *servname;
65155163Sshin	struct addrinfo **res;
65255163Sshin{
65355163Sshin	int s;
65455163Sshin	const struct afd *afd;
65555163Sshin	struct addrinfo *cur;
65655163Sshin	struct addrinfo sentinel;
65755163Sshin	int error;
65855163Sshin
65955163Sshin	*res = NULL;
66055163Sshin	sentinel.ai_next = NULL;
66155163Sshin	cur = &sentinel;
66255163Sshin
66355163Sshin	/*
66455163Sshin	 * filter out AFs that are not supported by the kernel
66555163Sshin	 * XXX errno?
66655163Sshin	 */
66771579Sdeischen	s = _socket(pai->ai_family, SOCK_DGRAM, 0);
66861877Sume	if (s < 0) {
66961877Sume		if (errno != EMFILE)
67061877Sume			return 0;
67161877Sume	} else
67261877Sume		_close(s);
67361877Sume
67461877Sume	/*
67561877Sume	 * if the servname does not match socktype/protocol, ignore it.
67661877Sume	 */
67761877Sume	if (get_portmatch(pai, servname) != 0)
67855163Sshin		return 0;
67961877Sume
68055163Sshin	afd = find_afd(pai->ai_family);
68155163Sshin	if (afd == NULL)
68255163Sshin		return 0;
68355163Sshin
68461877Sume	if (pai->ai_flags & AI_PASSIVE) {
68561877Sume		GET_AI(cur->ai_next, afd, afd->a_addrany);
68661877Sume		/* xxx meaningless?
68761877Sume		 * GET_CANONNAME(cur->ai_next, "anyaddr");
68861877Sume		 */
68961877Sume		GET_PORT(cur->ai_next, servname);
69061877Sume	} else {
69161877Sume		GET_AI(cur->ai_next, afd, afd->a_loopback);
69261877Sume		/* xxx meaningless?
69361877Sume		 * GET_CANONNAME(cur->ai_next, "localhost");
69461877Sume		 */
69561877Sume		GET_PORT(cur->ai_next, servname);
69661877Sume	}
69761877Sume	cur = cur->ai_next;
69855163Sshin
69955163Sshin	*res = sentinel.ai_next;
70055163Sshin	return 0;
70155163Sshin
70255163Sshinfree:
70355163Sshin	if (sentinel.ai_next)
70455163Sshin		freeaddrinfo(sentinel.ai_next);
70555163Sshin	return error;
70655163Sshin}
70755163Sshin
70855163Sshin/*
70955163Sshin * numeric hostname
71055163Sshin */
71155163Sshinstatic int
71255163Sshinexplore_numeric(pai, hostname, servname, res)
71355163Sshin	const struct addrinfo *pai;
71455163Sshin	const char *hostname;
71555163Sshin	const char *servname;
71655163Sshin	struct addrinfo **res;
71755163Sshin{
71855163Sshin	const struct afd *afd;
71955163Sshin	struct addrinfo *cur;
72055163Sshin	struct addrinfo sentinel;
72155163Sshin	int error;
72255163Sshin	char pton[PTON_MAX];
72355163Sshin
72455163Sshin	*res = NULL;
72555163Sshin	sentinel.ai_next = NULL;
72655163Sshin	cur = &sentinel;
72755163Sshin
72855163Sshin	/*
72955163Sshin	 * if the servname does not match socktype/protocol, ignore it.
73055163Sshin	 */
73155163Sshin	if (get_portmatch(pai, servname) != 0)
73255163Sshin		return 0;
73355163Sshin
73455163Sshin	afd = find_afd(pai->ai_family);
73555163Sshin	if (afd == NULL)
73655163Sshin		return 0;
73755163Sshin
73862614Sitojun	switch (afd->a_af) {
73962614Sitojun#if 1 /*X/Open spec*/
74062614Sitojun	case AF_INET:
74162614Sitojun		if (inet_aton(hostname, (struct in_addr *)pton) == 1) {
74262614Sitojun			if (pai->ai_family == afd->a_af ||
74362614Sitojun			    pai->ai_family == PF_UNSPEC /*?*/) {
74462614Sitojun				GET_AI(cur->ai_next, afd, pton);
74562614Sitojun				GET_PORT(cur->ai_next, servname);
74662614Sitojun				while (cur && cur->ai_next)
74762614Sitojun					cur = cur->ai_next;
74862614Sitojun			} else
74962614Sitojun				ERR(EAI_FAMILY);	/*xxx*/
75062614Sitojun		}
75162614Sitojun		break;
75262614Sitojun#endif
75362614Sitojun	default:
75462614Sitojun		if (inet_pton(afd->a_af, hostname, pton) == 1) {
75562614Sitojun			if (pai->ai_family == afd->a_af ||
75662614Sitojun			    pai->ai_family == PF_UNSPEC /*?*/) {
75762614Sitojun				GET_AI(cur->ai_next, afd, pton);
75862614Sitojun				GET_PORT(cur->ai_next, servname);
75962614Sitojun				while (cur && cur->ai_next)
76062614Sitojun					cur = cur->ai_next;
76162614Sitojun			} else
762105940Sume				ERR(EAI_FAMILY);	/* XXX */
76362614Sitojun		}
76462614Sitojun		break;
76555163Sshin	}
76655163Sshin
76755163Sshin	*res = sentinel.ai_next;
76855163Sshin	return 0;
76955163Sshin
77055163Sshinfree:
77155163Sshinbad:
77255163Sshin	if (sentinel.ai_next)
77355163Sshin		freeaddrinfo(sentinel.ai_next);
77455163Sshin	return error;
77555163Sshin}
77655163Sshin
77755163Sshin/*
77855163Sshin * numeric hostname with scope
77955163Sshin */
78055163Sshinstatic int
78155163Sshinexplore_numeric_scope(pai, hostname, servname, res)
78255163Sshin	const struct addrinfo *pai;
78355163Sshin	const char *hostname;
78455163Sshin	const char *servname;
78555163Sshin	struct addrinfo **res;
78655163Sshin{
78761877Sume#if !defined(SCOPE_DELIMITER) || !defined(INET6)
78855163Sshin	return explore_numeric(pai, hostname, servname, res);
78955163Sshin#else
79055163Sshin	const struct afd *afd;
79155163Sshin	struct addrinfo *cur;
79255163Sshin	int error;
79361877Sume	char *cp, *hostname2 = NULL, *scope, *addr;
79455163Sshin	struct sockaddr_in6 *sin6;
79555163Sshin
79655163Sshin	/*
79755163Sshin	 * if the servname does not match socktype/protocol, ignore it.
79855163Sshin	 */
79955163Sshin	if (get_portmatch(pai, servname) != 0)
80055163Sshin		return 0;
80155163Sshin
80255163Sshin	afd = find_afd(pai->ai_family);
80355163Sshin	if (afd == NULL)
80455163Sshin		return 0;
80565532Snectar
80655163Sshin	if (!afd->a_scoped)
80755163Sshin		return explore_numeric(pai, hostname, servname, res);
80855163Sshin
80955163Sshin	cp = strchr(hostname, SCOPE_DELIMITER);
81055163Sshin	if (cp == NULL)
81155163Sshin		return explore_numeric(pai, hostname, servname, res);
81255163Sshin
81355163Sshin	/*
81455163Sshin	 * Handle special case of <scoped_address><delimiter><scope id>
81555163Sshin	 */
81655163Sshin	hostname2 = strdup(hostname);
81755163Sshin	if (hostname2 == NULL)
81855163Sshin		return EAI_MEMORY;
81955163Sshin	/* terminate at the delimiter */
82055163Sshin	hostname2[cp - hostname] = '\0';
82161877Sume	addr = hostname2;
82261877Sume	scope = cp + 1;
82355163Sshin
82461877Sume	error = explore_numeric(pai, addr, servname, res);
82561877Sume	if (error == 0) {
826105943Sume		u_int32_t scopeid;
82755163Sshin
82855163Sshin		for (cur = *res; cur; cur = cur->ai_next) {
82955163Sshin			if (cur->ai_family != AF_INET6)
83055163Sshin				continue;
83161877Sume			sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
832105943Sume			if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
83361877Sume				free(hostname2);
83462614Sitojun				return(EAI_NODATA); /* XXX: is return OK? */
83561877Sume			}
83661877Sume			sin6->sin6_scope_id = scopeid;
83755163Sshin		}
83855163Sshin	}
83955163Sshin
84055163Sshin	free(hostname2);
84155163Sshin
84255163Sshin	return error;
84355163Sshin#endif
84455163Sshin}
84555163Sshin
84655163Sshinstatic int
84755163Sshinget_canonname(pai, ai, str)
84855163Sshin	const struct addrinfo *pai;
84955163Sshin	struct addrinfo *ai;
85055163Sshin	const char *str;
85155163Sshin{
85255163Sshin	if ((pai->ai_flags & AI_CANONNAME) != 0) {
85355163Sshin		ai->ai_canonname = (char *)malloc(strlen(str) + 1);
85455163Sshin		if (ai->ai_canonname == NULL)
85555163Sshin			return EAI_MEMORY;
856105940Sume		strlcpy(ai->ai_canonname, str, strlen(str) + 1);
85755163Sshin	}
85855163Sshin	return 0;
85955163Sshin}
86055163Sshin
86155163Sshinstatic struct addrinfo *
86255163Sshinget_ai(pai, afd, addr)
86355163Sshin	const struct addrinfo *pai;
86455163Sshin	const struct afd *afd;
86555163Sshin	const char *addr;
86655163Sshin{
86755163Sshin	char *p;
86855163Sshin	struct addrinfo *ai;
86955163Sshin#ifdef FAITH
87055163Sshin	struct in6_addr faith_prefix;
87155163Sshin	char *fp_str;
87255163Sshin	int translate = 0;
87355163Sshin#endif
87455163Sshin
87555163Sshin#ifdef FAITH
87655163Sshin	/*
87755163Sshin	 * Transfrom an IPv4 addr into a special IPv6 addr format for
87855163Sshin	 * IPv6->IPv4 translation gateway. (only TCP is supported now)
87955163Sshin	 *
88055163Sshin	 * +-----------------------------------+------------+
88155163Sshin	 * | faith prefix part (12 bytes)      | embedded   |
88255163Sshin	 * |                                   | IPv4 addr part (4 bytes)
88355163Sshin	 * +-----------------------------------+------------+
88455163Sshin	 *
88555163Sshin	 * faith prefix part is specified as ascii IPv6 addr format
88655163Sshin	 * in environmental variable GAI.
88755163Sshin	 * For FAITH to work correctly, routing to faith prefix must be
88855163Sshin	 * setup toward a machine where a FAITH daemon operates.
88955163Sshin	 * Also, the machine must enable some mechanizm
89055163Sshin	 * (e.g. faith interface hack) to divert those packet with
89155163Sshin	 * faith prefixed destination addr to user-land FAITH daemon.
89255163Sshin	 */
89355163Sshin	fp_str = getenv("GAI");
89455163Sshin	if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 &&
89555163Sshin	    afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) {
89655163Sshin		u_int32_t v4a;
89755163Sshin		u_int8_t v4a_top;
89855163Sshin
89955163Sshin		memcpy(&v4a, addr, sizeof v4a);
90055163Sshin		v4a_top = v4a >> IN_CLASSA_NSHIFT;
90155163Sshin		if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) &&
90255163Sshin		    v4a_top != 0 && v4a != IN_LOOPBACKNET) {
90355163Sshin			afd = &afdl[N_INET6];
90455163Sshin			memcpy(&faith_prefix.s6_addr[12], addr,
90555163Sshin			       sizeof(struct in_addr));
90655163Sshin			translate = 1;
90755163Sshin		}
90855163Sshin	}
90955163Sshin#endif
91055163Sshin
91155163Sshin	ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
91255163Sshin		+ (afd->a_socklen));
91355163Sshin	if (ai == NULL)
91455163Sshin		return NULL;
91555163Sshin
91655163Sshin	memcpy(ai, pai, sizeof(struct addrinfo));
91761877Sume	ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
91861877Sume	memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
91955163Sshin	ai->ai_addr->sa_len = afd->a_socklen;
92055163Sshin	ai->ai_addrlen = afd->a_socklen;
92155163Sshin	ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
92265532Snectar	p = (char *)(void *)(ai->ai_addr);
92355163Sshin#ifdef FAITH
92455163Sshin	if (translate == 1)
92565532Snectar		memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen);
92655163Sshin	else
92755163Sshin#endif
92865532Snectar	memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
92955163Sshin	return ai;
93055163Sshin}
93155163Sshin
93255163Sshinstatic int
93355163Sshinget_portmatch(ai, servname)
93455163Sshin	const struct addrinfo *ai;
93555163Sshin	const char *servname;
93655163Sshin{
93761877Sume
93855163Sshin	/* get_port does not touch first argument. when matchonly == 1. */
93961877Sume	/* LINTED const cast */
94055163Sshin	return get_port((struct addrinfo *)ai, servname, 1);
94155163Sshin}
94255163Sshin
94355163Sshinstatic int
94455163Sshinget_port(ai, servname, matchonly)
94555163Sshin	struct addrinfo *ai;
94655163Sshin	const char *servname;
94755163Sshin	int matchonly;
94855163Sshin{
94955163Sshin	const char *proto;
95055163Sshin	struct servent *sp;
95155163Sshin	int port;
95255163Sshin	int allownumeric;
95355163Sshin
95455163Sshin	if (servname == NULL)
95555163Sshin		return 0;
95661877Sume	switch (ai->ai_family) {
95761877Sume	case AF_INET:
95861877Sume#ifdef AF_INET6
95961877Sume	case AF_INET6:
96055163Sshin#endif
96161877Sume		break;
96261877Sume	default:
96355163Sshin		return 0;
96461877Sume	}
96555163Sshin
96655163Sshin	switch (ai->ai_socktype) {
96755163Sshin	case SOCK_RAW:
96855163Sshin		return EAI_SERVICE;
96955163Sshin	case SOCK_DGRAM:
97055163Sshin	case SOCK_STREAM:
97155163Sshin		allownumeric = 1;
97255163Sshin		break;
97355163Sshin	case ANY:
97455163Sshin		allownumeric = 0;
97555163Sshin		break;
97655163Sshin	default:
97755163Sshin		return EAI_SOCKTYPE;
97855163Sshin	}
97955163Sshin
98055163Sshin	if (str_isnumber(servname)) {
98155163Sshin		if (!allownumeric)
98255163Sshin			return EAI_SERVICE;
983105940Sume		port = atoi(servname);
98455163Sshin		if (port < 0 || port > 65535)
98555163Sshin			return EAI_SERVICE;
986105940Sume		port = htons(port);
98755163Sshin	} else {
98855163Sshin		switch (ai->ai_socktype) {
98955163Sshin		case SOCK_DGRAM:
99055163Sshin			proto = "udp";
99155163Sshin			break;
99255163Sshin		case SOCK_STREAM:
99355163Sshin			proto = "tcp";
99455163Sshin			break;
99555163Sshin		default:
99655163Sshin			proto = NULL;
99755163Sshin			break;
99855163Sshin		}
99955163Sshin
100055163Sshin		if ((sp = getservbyname(servname, proto)) == NULL)
100155163Sshin			return EAI_SERVICE;
100255163Sshin		port = sp->s_port;
100355163Sshin	}
100455163Sshin
100555163Sshin	if (!matchonly) {
100655163Sshin		switch (ai->ai_family) {
100755163Sshin		case AF_INET:
100861877Sume			((struct sockaddr_in *)(void *)
100961877Sume			    ai->ai_addr)->sin_port = port;
101055163Sshin			break;
101155163Sshin#ifdef INET6
101255163Sshin		case AF_INET6:
101361877Sume			((struct sockaddr_in6 *)(void *)
101461877Sume			    ai->ai_addr)->sin6_port = port;
101555163Sshin			break;
101655163Sshin#endif
101755163Sshin		}
101855163Sshin	}
101955163Sshin
102055163Sshin	return 0;
102155163Sshin}
102255163Sshin
102355163Sshinstatic const struct afd *
102455163Sshinfind_afd(af)
102555163Sshin	int af;
102655163Sshin{
102755163Sshin	const struct afd *afd;
102855163Sshin
102955163Sshin	if (af == PF_UNSPEC)
103055163Sshin		return NULL;
103155163Sshin	for (afd = afdl; afd->a_af; afd++) {
103255163Sshin		if (afd->a_af == af)
103355163Sshin			return afd;
103455163Sshin	}
103555163Sshin	return NULL;
103655163Sshin}
103761877Sume
103861877Sume/*
103961877Sume * post-2553: AI_ADDRCONFIG check.  if we use getipnodeby* as backend, backend
104061877Sume * will take care of it.
104161877Sume * the semantics of AI_ADDRCONFIG is not defined well.  we are not sure
104261877Sume * if the code is right or not.
104361877Sume *
104461877Sume * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
104561877Sume * _dns_getaddrinfo.
104661877Sume */
104761877Sumestatic int
104861877Sumeaddrconfig(pai)
104961877Sume	struct addrinfo *pai;
105061877Sume{
105161877Sume	int s, af;
105261877Sume
105361877Sume	/*
105461877Sume	 * TODO:
105561877Sume	 * Note that implementation dependent test for address
105661877Sume	 * configuration should be done everytime called
105761877Sume	 * (or apropriate interval),
105861877Sume	 * because addresses will be dynamically assigned or deleted.
105961877Sume	 */
106061877Sume	af = pai->ai_family;
106161877Sume	if (af == AF_UNSPEC) {
106271579Sdeischen		if ((s = _socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
106361877Sume			af = AF_INET;
106461877Sume		else {
106563704Sjasone			_close(s);
106671579Sdeischen			if ((s = _socket(AF_INET, SOCK_DGRAM, 0)) < 0)
106761877Sume				af = AF_INET6;
106861877Sume			else
106963704Sjasone				_close(s);
107061877Sume		}
107161877Sume	}
107261877Sume	if (af != AF_UNSPEC) {
107371579Sdeischen		if ((s = _socket(af, SOCK_DGRAM, 0)) < 0)
107461877Sume			return 0;
107563704Sjasone		_close(s);
107661877Sume	}
107761877Sume	pai->ai_family = af;
107861877Sume	return 1;
107961877Sume}
108061877Sume
108161877Sume#ifdef INET6
108261877Sume/* convert a string to a scope identifier. XXX: IPv6 specific */
108361877Sumestatic int
1084105943Sumeip6_str2scopeid(scope, sin6, scopeid)
108561877Sume	char *scope;
108661877Sume	struct sockaddr_in6 *sin6;
1087105943Sume	u_int32_t *scopeid;
108861877Sume{
1089105943Sume	u_long lscopeid;
1090105943Sume	struct in6_addr *a6;
109161877Sume	char *ep;
109261877Sume
1093105943Sume	a6 = &sin6->sin6_addr;
1094105943Sume
109562836Sitojun	/* empty scopeid portion is invalid */
109662836Sitojun	if (*scope == '\0')
109762836Sitojun		return -1;
109862836Sitojun
109961877Sume	if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) {
110061877Sume		/*
110161877Sume		 * We currently assume a one-to-one mapping between links
110261877Sume		 * and interfaces, so we simply use interface indices for
110361877Sume		 * like-local scopes.
110461877Sume		 */
1105105943Sume		*scopeid = if_nametoindex(scope);
1106105943Sume		if (*scopeid == 0)
110761877Sume			goto trynumeric;
1108105943Sume		return 0;
110961877Sume	}
111061877Sume
111161877Sume	/* still unclear about literal, allow numeric only - placeholder */
111261877Sume	if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
111361877Sume		goto trynumeric;
111461877Sume	if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
111561877Sume		goto trynumeric;
111661877Sume	else
111761877Sume		goto trynumeric;	/* global */
111861877Sume
111961877Sume	/* try to convert to a numeric id as a last resort */
112061877Sume  trynumeric:
1121105943Sume	errno = 0;
1122105943Sume	lscopeid = strtoul(scope, &ep, 10);
1123105943Sume	*scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1124105943Sume	if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1125105943Sume		return 0;
112661877Sume	else
112761877Sume		return -1;
112861877Sume}
112961877Sume#endif
113061877Sume
1131102237Spirzyk#ifdef RESOLVSORT
1132102237Spirzykstruct addr_ptr {
1133102237Spirzyk	struct addrinfo *ai;
1134102237Spirzyk	int aval;
1135102237Spirzyk};
1136102237Spirzyk
1137102237Spirzykstatic int
1138102237Spirzykaddr4sort(struct addrinfo *sentinel)
1139102237Spirzyk{
1140102237Spirzyk	struct addrinfo *ai;
1141102237Spirzyk	struct addr_ptr *addrs, addr;
1142102237Spirzyk	struct sockaddr_in *sin;
1143102237Spirzyk	int naddrs, i, j;
1144102237Spirzyk	int needsort = 0;
1145102237Spirzyk
1146102237Spirzyk	if (!sentinel)
1147102237Spirzyk		return -1;
1148102237Spirzyk	naddrs = 0;
1149102237Spirzyk	for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
1150102237Spirzyk		naddrs++;
1151102237Spirzyk	if (naddrs < 2)
1152102237Spirzyk		return 0;		/* We don't need sorting. */
1153102237Spirzyk	if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
1154102237Spirzyk		return -1;
1155102237Spirzyk	i = 0;
1156102237Spirzyk	for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
1157102237Spirzyk		sin = (struct sockaddr_in *)ai->ai_addr;
1158102237Spirzyk		for (j = 0; (unsigned)j < _res.nsort; j++) {
1159102237Spirzyk			if (_res.sort_list[j].addr.s_addr ==
1160102237Spirzyk			    (sin->sin_addr.s_addr & _res.sort_list[j].mask))
1161102237Spirzyk				break;
1162102237Spirzyk		}
1163102237Spirzyk		addrs[i].ai = ai;
1164102237Spirzyk		addrs[i].aval = j;
1165102237Spirzyk		if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
1166102237Spirzyk			needsort = i;
1167102237Spirzyk		i++;
1168102237Spirzyk	}
1169102237Spirzyk	if (!needsort) {
1170102237Spirzyk		free(addrs);
1171102237Spirzyk		return 0;
1172102237Spirzyk	}
1173102237Spirzyk
1174102237Spirzyk	while (needsort < naddrs) {
1175102237Spirzyk	    for (j = needsort - 1; j >= 0; j--) {
1176102237Spirzyk		if (addrs[j].aval > addrs[j+1].aval) {
1177102237Spirzyk		    addr = addrs[j];
1178102237Spirzyk		    addrs[j] = addrs[j + 1];
1179102237Spirzyk		    addrs[j + 1] = addr;
1180102237Spirzyk		} else
1181102237Spirzyk		    break;
1182102237Spirzyk	    }
1183102237Spirzyk	    needsort++;
1184102237Spirzyk	}
1185102237Spirzyk
1186102237Spirzyk	ai = sentinel;
1187102237Spirzyk	for (i = 0; i < naddrs; ++i) {
1188102237Spirzyk		ai->ai_next = addrs[i].ai;
1189102237Spirzyk		ai = ai->ai_next;
1190102237Spirzyk	}
1191102237Spirzyk	ai->ai_next = NULL;
1192102237Spirzyk	free(addrs);
1193102237Spirzyk	return 0;
1194102237Spirzyk}
1195102237Spirzyk#endif /*RESOLVSORT*/
1196102237Spirzyk
119761877Sume#ifdef DEBUG
119861877Sumestatic const char AskedForGot[] =
119961877Sume	"gethostby*.getanswer: asked for \"%s\", got \"%s\"";
120061877Sume#endif
120165532Snectarstatic FILE *hostf = NULL;
120261877Sume
120361877Sumestatic struct addrinfo *
120461877Sumegetanswer(answer, anslen, qname, qtype, pai)
120561877Sume	const querybuf *answer;
120661877Sume	int anslen;
120761877Sume	const char *qname;
120861877Sume	int qtype;
120961877Sume	const struct addrinfo *pai;
121061877Sume{
121161877Sume	struct addrinfo sentinel, *cur;
121261877Sume	struct addrinfo ai;
121361877Sume	const struct afd *afd;
121461877Sume	char *canonname;
121561877Sume	const HEADER *hp;
121661877Sume	const u_char *cp;
121761877Sume	int n;
121861877Sume	const u_char *eom;
1219105940Sume	char *bp, *ep;
1220105940Sume	int type, class, ancount, qdcount;
122161877Sume	int haveanswer, had_error;
122261877Sume	char tbuf[MAXDNAME];
122392905Sobrien	int (*name_ok)(const char *);
122461877Sume	char hostbuf[8*1024];
122561877Sume
122661877Sume	memset(&sentinel, 0, sizeof(sentinel));
122761877Sume	cur = &sentinel;
122861877Sume
122961877Sume	canonname = NULL;
123061877Sume	eom = answer->buf + anslen;
123161877Sume	switch (qtype) {
123261877Sume	case T_A:
123361877Sume	case T_AAAA:
123461877Sume	case T_ANY:	/*use T_ANY only for T_A/T_AAAA lookup*/
123561877Sume		name_ok = res_hnok;
123661877Sume		break;
123761877Sume	default:
123861877Sume		return (NULL);	/* XXX should be abort(); */
123961877Sume	}
124061877Sume	/*
124161877Sume	 * find first satisfactory answer
124261877Sume	 */
124361877Sume	hp = &answer->hdr;
124461877Sume	ancount = ntohs(hp->ancount);
124561877Sume	qdcount = ntohs(hp->qdcount);
124661877Sume	bp = hostbuf;
1247105940Sume	ep = hostbuf + sizeof hostbuf;
124861877Sume	cp = answer->buf + HFIXEDSZ;
124961877Sume	if (qdcount != 1) {
125061877Sume		h_errno = NO_RECOVERY;
125161877Sume		return (NULL);
125261877Sume	}
1253105940Sume	n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
125461877Sume	if ((n < 0) || !(*name_ok)(bp)) {
125561877Sume		h_errno = NO_RECOVERY;
125661877Sume		return (NULL);
125761877Sume	}
125861877Sume	cp += n + QFIXEDSZ;
125961877Sume	if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
126061877Sume		/* res_send() has already verified that the query name is the
126161877Sume		 * same as the one we sent; this just gets the expanded name
126261877Sume		 * (i.e., with the succeeding search-domain tacked on).
126361877Sume		 */
126461877Sume		n = strlen(bp) + 1;		/* for the \0 */
126561877Sume		if (n >= MAXHOSTNAMELEN) {
126661877Sume			h_errno = NO_RECOVERY;
126761877Sume			return (NULL);
126861877Sume		}
126961877Sume		canonname = bp;
127061877Sume		bp += n;
127161877Sume		/* The qname can be abbreviated, but h_name is now absolute. */
127261877Sume		qname = canonname;
127361877Sume	}
127461877Sume	haveanswer = 0;
127561877Sume	had_error = 0;
127661877Sume	while (ancount-- > 0 && cp < eom && !had_error) {
1277105940Sume		n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
127861877Sume		if ((n < 0) || !(*name_ok)(bp)) {
127961877Sume			had_error++;
128061877Sume			continue;
128161877Sume		}
128261877Sume		cp += n;			/* name */
128361877Sume		type = _getshort(cp);
128461877Sume 		cp += INT16SZ;			/* type */
128561877Sume		class = _getshort(cp);
128661877Sume 		cp += INT16SZ + INT32SZ;	/* class, TTL */
128761877Sume		n = _getshort(cp);
128861877Sume		cp += INT16SZ;			/* len */
128961877Sume		if (class != C_IN) {
129061877Sume			/* XXX - debug? syslog? */
129161877Sume			cp += n;
129261877Sume			continue;		/* XXX - had_error++ ? */
129361877Sume		}
129461877Sume		if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
129561877Sume		    type == T_CNAME) {
129661877Sume			n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
129761877Sume			if ((n < 0) || !(*name_ok)(tbuf)) {
129861877Sume				had_error++;
129961877Sume				continue;
130061877Sume			}
130161877Sume			cp += n;
130261877Sume			/* Get canonical name. */
130361877Sume			n = strlen(tbuf) + 1;	/* for the \0 */
1304105940Sume			if (n > ep - bp || n >= MAXHOSTNAMELEN) {
130561877Sume				had_error++;
130661877Sume				continue;
130761877Sume			}
1308105940Sume			strlcpy(bp, tbuf, ep - bp);
130961877Sume			canonname = bp;
131061877Sume			bp += n;
131161877Sume			continue;
131261877Sume		}
131361877Sume		if (qtype == T_ANY) {
131461877Sume			if (!(type == T_A || type == T_AAAA)) {
131561877Sume				cp += n;
131661877Sume				continue;
131761877Sume			}
131861877Sume		} else if (type != qtype) {
131961877Sume#ifdef DEBUG
132061877Sume			if (type != T_KEY && type != T_SIG)
132161877Sume				syslog(LOG_NOTICE|LOG_AUTH,
132261877Sume	       "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
132361877Sume				       qname, p_class(C_IN), p_type(qtype),
132461877Sume				       p_type(type));
132561877Sume#endif
132661877Sume			cp += n;
132761877Sume			continue;		/* XXX - had_error++ ? */
132861877Sume		}
132961877Sume		switch (type) {
133061877Sume		case T_A:
133161877Sume		case T_AAAA:
133261877Sume			if (strcasecmp(canonname, bp) != 0) {
133361877Sume#ifdef DEBUG
133461877Sume				syslog(LOG_NOTICE|LOG_AUTH,
133561877Sume				       AskedForGot, canonname, bp);
133661877Sume#endif
133761877Sume				cp += n;
133861877Sume				continue;	/* XXX - had_error++ ? */
133961877Sume			}
134061877Sume			if (type == T_A && n != INADDRSZ) {
134161877Sume				cp += n;
134261877Sume				continue;
134361877Sume			}
134461877Sume			if (type == T_AAAA && n != IN6ADDRSZ) {
134561877Sume				cp += n;
134661877Sume				continue;
134761877Sume			}
134861877Sume#ifdef FILTER_V4MAPPED
134961877Sume			if (type == T_AAAA) {
135061877Sume				struct in6_addr in6;
135161877Sume				memcpy(&in6, cp, sizeof(in6));
135261877Sume				if (IN6_IS_ADDR_V4MAPPED(&in6)) {
135361877Sume					cp += n;
135461877Sume					continue;
135561877Sume				}
135661877Sume			}
135761877Sume#endif
135861877Sume			if (!haveanswer) {
135961877Sume				int nn;
136061877Sume
136161877Sume				canonname = bp;
136261877Sume				nn = strlen(bp) + 1;	/* for the \0 */
136361877Sume				bp += nn;
136461877Sume			}
136561877Sume
136661877Sume			/* don't overwrite pai */
136761877Sume			ai = *pai;
136861877Sume			ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
136961877Sume			afd = find_afd(ai.ai_family);
137061877Sume			if (afd == NULL) {
137161877Sume				cp += n;
137261877Sume				continue;
137361877Sume			}
137461877Sume			cur->ai_next = get_ai(&ai, afd, (const char *)cp);
137561877Sume			if (cur->ai_next == NULL)
137661877Sume				had_error++;
137761877Sume			while (cur && cur->ai_next)
137861877Sume				cur = cur->ai_next;
137961877Sume			cp += n;
138061877Sume			break;
138161877Sume		default:
138261877Sume			abort();
138361877Sume		}
138461877Sume		if (!had_error)
138561877Sume			haveanswer++;
138661877Sume	}
138761877Sume	if (haveanswer) {
1388102237Spirzyk#if defined(RESOLVSORT)
1389102237Spirzyk		/*
1390102237Spirzyk		 * We support only IPv4 address for backward
1391102237Spirzyk		 * compatibility against gethostbyname(3).
1392102237Spirzyk		 */
1393102237Spirzyk		if (_res.nsort && qtype == T_A) {
1394102237Spirzyk			if (addr4sort(&sentinel) < 0) {
1395102237Spirzyk				freeaddrinfo(sentinel.ai_next);
1396102237Spirzyk				h_errno = NO_RECOVERY;
1397102237Spirzyk				return NULL;
1398102237Spirzyk			}
1399102237Spirzyk		}
1400102237Spirzyk#endif /*RESOLVSORT*/
140161877Sume		if (!canonname)
140261877Sume			(void)get_canonname(pai, sentinel.ai_next, qname);
140361877Sume		else
140461877Sume			(void)get_canonname(pai, sentinel.ai_next, canonname);
140561877Sume		h_errno = NETDB_SUCCESS;
140661877Sume		return sentinel.ai_next;
140761877Sume	}
140861877Sume
140961877Sume	h_errno = NO_RECOVERY;
141061877Sume	return NULL;
141161877Sume}
141261877Sume
141361877Sume/*ARGSUSED*/
141461877Sumestatic int
141565532Snectar_dns_getaddrinfo(rv, cb_data, ap)
141665532Snectar	void	*rv;
141765532Snectar	void	*cb_data;
141865532Snectar	va_list	 ap;
141961877Sume{
142061877Sume	struct addrinfo *ai;
1421103357Sume	querybuf *buf, *buf2;
142261877Sume	const char *name;
142365532Snectar	const struct addrinfo *pai;
142461877Sume	struct addrinfo sentinel, *cur;
142561877Sume	struct res_target q, q2;
142661877Sume
142765532Snectar	name = va_arg(ap, char *);
142865532Snectar	pai = va_arg(ap, const struct addrinfo *);
142965532Snectar
143061877Sume	memset(&q, 0, sizeof(q2));
143161877Sume	memset(&q2, 0, sizeof(q2));
143261877Sume	memset(&sentinel, 0, sizeof(sentinel));
143361877Sume	cur = &sentinel;
143461877Sume
1435103357Sume	buf = malloc(sizeof(*buf));
1436103357Sume	if (!buf) {
1437103357Sume		h_errno = NETDB_INTERNAL;
1438103357Sume		return NS_NOTFOUND;
1439103357Sume	}
1440103357Sume	buf2 = malloc(sizeof(*buf2));
1441103357Sume	if (!buf2) {
1442103357Sume		free(buf);
1443103357Sume		h_errno = NETDB_INTERNAL;
1444103357Sume		return NS_NOTFOUND;
1445103357Sume	}
1446103357Sume
144761877Sume	switch (pai->ai_family) {
144861877Sume	case AF_UNSPEC:
144961877Sume		/* prefer IPv6 */
1450105940Sume		q.name = name;
145162614Sitojun		q.qclass = C_IN;
145262614Sitojun		q.qtype = T_AAAA;
1453103357Sume		q.answer = buf->buf;
1454103357Sume		q.anslen = sizeof(buf->buf);
145561877Sume		q.next = &q2;
1456105943Sume		q2.name = name;
145762614Sitojun		q2.qclass = C_IN;
145862614Sitojun		q2.qtype = T_A;
1459103357Sume		q2.answer = buf2->buf;
1460103357Sume		q2.anslen = sizeof(buf2->buf);
146161877Sume		break;
146261877Sume	case AF_INET:
1463105940Sume		q.name = name;
146462614Sitojun		q.qclass = C_IN;
146562614Sitojun		q.qtype = T_A;
1466103357Sume		q.answer = buf->buf;
1467103357Sume		q.anslen = sizeof(buf->buf);
146861877Sume		break;
146961877Sume	case AF_INET6:
1470105940Sume		q.name = name;
147162614Sitojun		q.qclass = C_IN;
147262614Sitojun		q.qtype = T_AAAA;
1473103357Sume		q.answer = buf->buf;
1474103357Sume		q.anslen = sizeof(buf->buf);
147561877Sume		break;
147661877Sume	default:
1477103357Sume		free(buf);
1478103357Sume		free(buf2);
147965532Snectar		return NS_UNAVAIL;
148061877Sume	}
1481103357Sume	if (res_searchN(name, &q) < 0) {
1482103357Sume		free(buf);
1483103357Sume		free(buf2);
148465532Snectar		return NS_NOTFOUND;
1485103357Sume	}
1486103357Sume	ai = getanswer(buf, q.n, q.name, q.qtype, pai);
148761877Sume	if (ai) {
148861877Sume		cur->ai_next = ai;
148961877Sume		while (cur && cur->ai_next)
149061877Sume			cur = cur->ai_next;
149161877Sume	}
149261877Sume	if (q.next) {
1493103357Sume		ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai);
149461877Sume		if (ai)
149561877Sume			cur->ai_next = ai;
149661877Sume	}
1497103357Sume	free(buf);
1498103357Sume	free(buf2);
149961877Sume	if (sentinel.ai_next == NULL)
150061877Sume		switch (h_errno) {
150161877Sume		case HOST_NOT_FOUND:
150265532Snectar			return NS_NOTFOUND;
150361877Sume		case TRY_AGAIN:
150465532Snectar			return NS_TRYAGAIN;
150561877Sume		default:
150665532Snectar			return NS_UNAVAIL;
150761877Sume		}
150865532Snectar	*((struct addrinfo **)rv) = sentinel.ai_next;
150965532Snectar	return NS_SUCCESS;
151061877Sume}
151161877Sume
151265532Snectarstatic void
151365532Snectar_sethtent()
151465532Snectar{
151565532Snectar	if (!hostf)
151665532Snectar		hostf = fopen(_PATH_HOSTS, "r" );
151765532Snectar	else
151865532Snectar		rewind(hostf);
151965532Snectar}
152065532Snectar
152165532Snectarstatic void
152265532Snectar_endhtent()
152365532Snectar{
152465532Snectar	if (hostf) {
152565532Snectar		(void) fclose(hostf);
152665532Snectar		hostf = NULL;
152765532Snectar	}
152865532Snectar}
152965532Snectar
153061877Sumestatic struct addrinfo *
153165532Snectar_gethtent(name, pai)
153261877Sume	const char *name;
153361877Sume	const struct addrinfo *pai;
153461877Sume{
153561877Sume	char *p;
153661877Sume	char *cp, *tname, *cname;
153761877Sume	struct addrinfo hints, *res0, *res;
153861877Sume	int error;
153961877Sume	const char *addr;
154061877Sume	char hostbuf[8*1024];
154161877Sume
154265532Snectar	if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" )))
154365532Snectar		return (NULL);
1544105940Sumeagain:
154561877Sume	if (!(p = fgets(hostbuf, sizeof hostbuf, hostf)))
154661877Sume		return (NULL);
154761877Sume	if (*p == '#')
154861877Sume		goto again;
154961877Sume	if (!(cp = strpbrk(p, "#\n")))
155061877Sume		goto again;
155161877Sume	*cp = '\0';
155261877Sume	if (!(cp = strpbrk(p, " \t")))
155361877Sume		goto again;
155461877Sume	*cp++ = '\0';
155561877Sume	addr = p;
155661877Sume	cname = NULL;
155761877Sume	/* if this is not something we're looking for, skip it. */
155861877Sume	while (cp && *cp) {
155961877Sume		if (*cp == ' ' || *cp == '\t') {
156061877Sume			cp++;
156161877Sume			continue;
156261877Sume		}
156361877Sume		tname = cp;
156461877Sume		if (cname == NULL)
156561877Sume			cname = cp;
156661877Sume		if ((cp = strpbrk(cp, " \t")) != NULL)
156761877Sume			*cp++ = '\0';
156861877Sume		if (strcasecmp(name, tname) == 0)
156961877Sume			goto found;
157061877Sume	}
157161877Sume	goto again;
157261877Sume
157361877Sumefound:
1574105940Sume	/* we should not glob socktype/protocol here */
1575105940Sume	memset(&hints, 0, sizeof(hints));
1576105940Sume	hints.ai_family = pai->ai_family;
1577105940Sume	hints.ai_socktype = SOCK_DGRAM;
1578105940Sume	hints.ai_protocol = 0;
157961877Sume	hints.ai_flags = AI_NUMERICHOST;
1580105940Sume	error = getaddrinfo(addr, "0", &hints, &res0);
158161877Sume	if (error)
158261877Sume		goto again;
158361877Sume#ifdef FILTER_V4MAPPED
158461877Sume	/* XXX should check all items in the chain */
158561877Sume	if (res0->ai_family == AF_INET6 &&
158661877Sume	    IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
158761877Sume		freeaddrinfo(res0);
158861877Sume		goto again;
158961877Sume	}
159061877Sume#endif
159161877Sume	for (res = res0; res; res = res->ai_next) {
159261877Sume		/* cover it up */
159361877Sume		res->ai_flags = pai->ai_flags;
1594105940Sume		res->ai_socktype = pai->ai_socktype;
1595105940Sume		res->ai_protocol = pai->ai_protocol;
159661877Sume
159761877Sume		if (pai->ai_flags & AI_CANONNAME) {
159861877Sume			if (get_canonname(pai, res, cname) != 0) {
159961877Sume				freeaddrinfo(res0);
160061877Sume				goto again;
160161877Sume			}
160261877Sume		}
160361877Sume	}
160461877Sume	return res0;
160561877Sume}
160661877Sume
160761877Sume/*ARGSUSED*/
160861877Sumestatic int
160965532Snectar_files_getaddrinfo(rv, cb_data, ap)
161065532Snectar	void	*rv;
161165532Snectar	void	*cb_data;
161265532Snectar	va_list	 ap;
161365532Snectar{
161465532Snectar	const char *name;
161561877Sume	const struct addrinfo *pai;
161661877Sume	struct addrinfo sentinel, *cur;
161761877Sume	struct addrinfo *p;
161861877Sume
161965532Snectar	name = va_arg(ap, char *);
162065532Snectar	pai = va_arg(ap, struct addrinfo *);
162165532Snectar
162265532Snectar	memset(&sentinel, 0, sizeof(sentinel));
162361877Sume	cur = &sentinel;
162461877Sume
162565532Snectar	_sethtent();
162665532Snectar	while ((p = _gethtent(name, pai)) != NULL) {
162761877Sume		cur->ai_next = p;
162861877Sume		while (cur && cur->ai_next)
162961877Sume			cur = cur->ai_next;
163061877Sume	}
163165532Snectar	_endhtent();
163261877Sume
163365532Snectar	*((struct addrinfo **)rv) = sentinel.ai_next;
163465532Snectar	if (sentinel.ai_next == NULL)
163565532Snectar		return NS_NOTFOUND;
163665532Snectar	return NS_SUCCESS;
163761877Sume}
163861877Sume
163961877Sume#ifdef YP
164065532Snectarstatic char *__ypdomain;
164165532Snectar
164261877Sume/*ARGSUSED*/
164365532Snectarstatic struct addrinfo *
164465532Snectar_yphostent(line, pai)
164565532Snectar	char *line;
164661877Sume	const struct addrinfo *pai;
164761877Sume{
164861877Sume	struct addrinfo sentinel, *cur;
164965532Snectar	struct addrinfo hints, *res, *res0;
165061877Sume	int error;
165165532Snectar	char *p = line;
165265532Snectar	const char *addr, *canonname;
165365532Snectar	char *nextline;
165465532Snectar	char *cp;
165561877Sume
165665532Snectar	addr = canonname = NULL;
165765532Snectar
165865532Snectar	memset(&sentinel, 0, sizeof(sentinel));
165961877Sume	cur = &sentinel;
166061877Sume
166165532Snectarnextline:
166265532Snectar	/* terminate line */
166365532Snectar	cp = strchr(p, '\n');
166465532Snectar	if (cp) {
166565532Snectar		*cp++ = '\0';
166665532Snectar		nextline = cp;
166765532Snectar	} else
166865532Snectar		nextline = NULL;
166961877Sume
167065532Snectar	cp = strpbrk(p, " \t");
167165532Snectar	if (cp == NULL) {
167265532Snectar		if (canonname == NULL)
167365532Snectar			return (NULL);
167465532Snectar		else
167565532Snectar			goto done;
167661877Sume	}
167765532Snectar	*cp++ = '\0';
167861877Sume
167965532Snectar	addr = p;
168061877Sume
168165532Snectar	while (cp && *cp) {
168265532Snectar		if (*cp == ' ' || *cp == '\t') {
168365532Snectar			cp++;
168461877Sume			continue;
168565532Snectar		}
168665532Snectar		if (!canonname)
168765532Snectar			canonname = cp;
168865532Snectar		if ((cp = strpbrk(cp, " \t")) != NULL)
168965532Snectar			*cp++ = '\0';
169065532Snectar	}
169161877Sume
169265532Snectar	hints = *pai;
169365532Snectar	hints.ai_flags = AI_NUMERICHOST;
169465532Snectar	error = getaddrinfo(addr, NULL, &hints, &res0);
169565532Snectar	if (error == 0) {
169665532Snectar		for (res = res0; res; res = res->ai_next) {
169765532Snectar			/* cover it up */
169865532Snectar			res->ai_flags = pai->ai_flags;
169961877Sume
170065532Snectar			if (pai->ai_flags & AI_CANONNAME)
170165532Snectar				(void)get_canonname(pai, res, canonname);
170261877Sume		}
170365532Snectar	} else
170465532Snectar		res0 = NULL;
170565532Snectar	if (res0) {
170665532Snectar		cur->ai_next = res0;
170761877Sume		while (cur && cur->ai_next)
170861877Sume			cur = cur->ai_next;
170961877Sume	}
171061877Sume
171165532Snectar	if (nextline) {
171265532Snectar		p = nextline;
171365532Snectar		goto nextline;
171465532Snectar	}
171561877Sume
171665532Snectardone:
171765532Snectar	return sentinel.ai_next;
171861877Sume}
171965532Snectar
172065532Snectar/*ARGSUSED*/
172165532Snectarstatic int
172265532Snectar_yp_getaddrinfo(rv, cb_data, ap)
172365532Snectar	void	*rv;
172465532Snectar	void	*cb_data;
172565532Snectar	va_list	 ap;
172665532Snectar{
172765532Snectar	struct addrinfo sentinel, *cur;
172865532Snectar	struct addrinfo *ai = NULL;
172965532Snectar	static char *__ypcurrent;
173065532Snectar	int __ypcurrentlen, r;
173165532Snectar	const char *name;
173265532Snectar	const struct addrinfo *pai;
173365532Snectar
173465532Snectar	name = va_arg(ap, char *);
173565532Snectar	pai = va_arg(ap, const struct addrinfo *);
173665532Snectar
173765532Snectar	memset(&sentinel, 0, sizeof(sentinel));
173865532Snectar	cur = &sentinel;
173965532Snectar
174065532Snectar	if (!__ypdomain) {
174165532Snectar		if (_yp_check(&__ypdomain) == 0)
174265532Snectar			return NS_UNAVAIL;
174365532Snectar	}
174465532Snectar	if (__ypcurrent)
174565532Snectar		free(__ypcurrent);
174665532Snectar	__ypcurrent = NULL;
174765532Snectar
174865532Snectar	/* hosts.byname is only for IPv4 (Solaris8) */
174965532Snectar	if (pai->ai_family == PF_UNSPEC || pai->ai_family == PF_INET) {
175065532Snectar		r = yp_match(__ypdomain, "hosts.byname", name,
175165532Snectar			(int)strlen(name), &__ypcurrent, &__ypcurrentlen);
175265532Snectar		if (r == 0) {
175365532Snectar			struct addrinfo ai4;
175465532Snectar
175565532Snectar			ai4 = *pai;
175665532Snectar			ai4.ai_family = AF_INET;
175765532Snectar			ai = _yphostent(__ypcurrent, &ai4);
175865532Snectar			if (ai) {
175965532Snectar				cur->ai_next = ai;
176065532Snectar				while (cur && cur->ai_next)
176165532Snectar					cur = cur->ai_next;
176265532Snectar			}
176365532Snectar		}
176465532Snectar	}
176565532Snectar
176665532Snectar	/* ipnodes.byname can hold both IPv4/v6 */
176765532Snectar	r = yp_match(__ypdomain, "ipnodes.byname", name,
176865532Snectar		(int)strlen(name), &__ypcurrent, &__ypcurrentlen);
176965532Snectar	if (r == 0) {
177065532Snectar		ai = _yphostent(__ypcurrent, pai);
177165532Snectar		if (ai) {
177265532Snectar			cur->ai_next = ai;
177365532Snectar			while (cur && cur->ai_next)
177465532Snectar				cur = cur->ai_next;
177565532Snectar		}
177665532Snectar	}
177765532Snectar
177865532Snectar	if (sentinel.ai_next == NULL) {
177965532Snectar		h_errno = HOST_NOT_FOUND;
178065532Snectar		return NS_NOTFOUND;
178165532Snectar	}
178265532Snectar	*((struct addrinfo **)rv) = sentinel.ai_next;
178365532Snectar	return NS_SUCCESS;
178465532Snectar}
178561877Sume#endif
178661877Sume
178761877Sume/* resolver logic */
178861877Sume
178992905Sobrienextern const char *__hostalias(const char *);
179061877Sumeextern int h_errno;
179161877Sume
179261877Sume/*
179361877Sume * Formulate a normal query, send, and await answer.
179461877Sume * Returned answer is placed in supplied buffer "answer".
179561877Sume * Perform preliminary check of answer, returning success only
179661877Sume * if no error is indicated and the answer count is nonzero.
179761877Sume * Return the size of the response on success, -1 on error.
179861877Sume * Error number is left in h_errno.
179961877Sume *
180061877Sume * Caller must parse answer and determine whether it answers the question.
180161877Sume */
180261877Sumestatic int
180361877Sumeres_queryN(name, target)
180461877Sume	const char *name;	/* domain name */
180561877Sume	struct res_target *target;
180661877Sume{
1807103357Sume	u_char *buf;
180861877Sume	HEADER *hp;
180961877Sume	int n;
181061877Sume	struct res_target *t;
181161877Sume	int rcode;
181261877Sume	int ancount;
181361877Sume
181461877Sume	rcode = NOERROR;
181561877Sume	ancount = 0;
181661877Sume
181761877Sume	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
181861877Sume		h_errno = NETDB_INTERNAL;
181961877Sume		return (-1);
182061877Sume	}
182161877Sume
1822103357Sume	buf = malloc(MAXPACKET);
1823103357Sume	if (!buf) {
1824103357Sume		h_errno = NETDB_INTERNAL;
1825103357Sume		return -1;
1826103357Sume	}
1827103357Sume
182861877Sume	for (t = target; t; t = t->next) {
182961877Sume		int class, type;
183061877Sume		u_char *answer;
183161877Sume		int anslen;
183261877Sume
183361877Sume		hp = (HEADER *)(void *)t->answer;
183461877Sume		hp->rcode = NOERROR;	/* default */
183561877Sume
183661877Sume		/* make it easier... */
183762614Sitojun		class = t->qclass;
183862614Sitojun		type = t->qtype;
183961877Sume		answer = t->answer;
184061877Sume		anslen = t->anslen;
184161877Sume#ifdef DEBUG
184261877Sume		if (_res.options & RES_DEBUG)
184361877Sume			printf(";; res_query(%s, %d, %d)\n", name, class, type);
184461877Sume#endif
184561877Sume
184661877Sume		n = res_mkquery(QUERY, name, class, type, NULL, 0, NULL,
1847103357Sume		    buf, MAXPACKET);
184878012Sume		if (n > 0 && (_res.options & RES_USE_EDNS0) != 0)
1849103357Sume			n = res_opt(n, buf, MAXPACKET, anslen);
185061877Sume		if (n <= 0) {
185161877Sume#ifdef DEBUG
185261877Sume			if (_res.options & RES_DEBUG)
185361877Sume				printf(";; res_query: mkquery failed\n");
185461877Sume#endif
1855103357Sume			free(buf);
185661877Sume			h_errno = NO_RECOVERY;
185761877Sume			return (n);
185861877Sume		}
185961877Sume		n = res_send(buf, n, answer, anslen);
186061877Sume#if 0
186161877Sume		if (n < 0) {
186261877Sume#ifdef DEBUG
186361877Sume			if (_res.options & RES_DEBUG)
186461877Sume				printf(";; res_query: send error\n");
186561877Sume#endif
1866103357Sume			free(buf);
186761877Sume			h_errno = TRY_AGAIN;
186861877Sume			return (n);
186961877Sume		}
187061877Sume#endif
187161877Sume
1872103350Snectar		if (n < 0 || n > anslen)
1873103350Snectar			hp->rcode = FORMERR; /* XXX not very informative */
1874103350Snectar		if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
187561877Sume			rcode = hp->rcode;	/* record most recent error */
187661877Sume#ifdef DEBUG
187761877Sume			if (_res.options & RES_DEBUG)
1878105940Sume				printf(";; rcode = %u, ancount=%u\n", hp->rcode,
187961877Sume				    ntohs(hp->ancount));
188061877Sume#endif
188161877Sume			continue;
188261877Sume		}
188361877Sume
188461877Sume		ancount += ntohs(hp->ancount);
188561877Sume
188661877Sume		t->n = n;
188761877Sume	}
188861877Sume
1889103357Sume	free(buf);
1890103357Sume
189161877Sume	if (ancount == 0) {
189261877Sume		switch (rcode) {
189361877Sume		case NXDOMAIN:
189461877Sume			h_errno = HOST_NOT_FOUND;
189561877Sume			break;
189661877Sume		case SERVFAIL:
189761877Sume			h_errno = TRY_AGAIN;
189861877Sume			break;
189961877Sume		case NOERROR:
190061877Sume			h_errno = NO_DATA;
190161877Sume			break;
190261877Sume		case FORMERR:
190361877Sume		case NOTIMP:
190461877Sume		case REFUSED:
190561877Sume		default:
190661877Sume			h_errno = NO_RECOVERY;
190761877Sume			break;
190861877Sume		}
190961877Sume		return (-1);
191061877Sume	}
191161877Sume	return (ancount);
191261877Sume}
191361877Sume
191461877Sume/*
191561877Sume * Formulate a normal query, send, and retrieve answer in supplied buffer.
191661877Sume * Return the size of the response on success, -1 on error.
191761877Sume * If enabled, implement search rules until answer or unrecoverable failure
191861877Sume * is detected.  Error code, if any, is left in h_errno.
191961877Sume */
192061877Sumestatic int
192161877Sumeres_searchN(name, target)
192261877Sume	const char *name;	/* domain name */
192361877Sume	struct res_target *target;
192461877Sume{
192561877Sume	const char *cp, * const *domain;
192661877Sume	HEADER *hp = (HEADER *)(void *)target->answer;	/*XXX*/
192761877Sume	u_int dots;
192861877Sume	int trailing_dot, ret, saved_herrno;
192961877Sume	int got_nodata = 0, got_servfail = 0, tried_as_is = 0;
193061877Sume
193161877Sume	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
193261877Sume		h_errno = NETDB_INTERNAL;
193361877Sume		return (-1);
193461877Sume	}
193561877Sume
193661877Sume	errno = 0;
193761877Sume	h_errno = HOST_NOT_FOUND;	/* default, if we never query */
193861877Sume	dots = 0;
193961877Sume	for (cp = name; *cp; cp++)
194061877Sume		dots += (*cp == '.');
194161877Sume	trailing_dot = 0;
194261877Sume	if (cp > name && *--cp == '.')
194361877Sume		trailing_dot++;
194461877Sume
194561877Sume	/*
194661877Sume	 * if there aren't any dots, it could be a user-level alias
194761877Sume	 */
194861877Sume	if (!dots && (cp = __hostalias(name)) != NULL)
194961877Sume		return (res_queryN(cp, target));
195061877Sume
195161877Sume	/*
195261877Sume	 * If there are dots in the name already, let's just give it a try
195361877Sume	 * 'as is'.  The threshold can be set with the "ndots" option.
195461877Sume	 */
195561877Sume	saved_herrno = -1;
195661877Sume	if (dots >= _res.ndots) {
195761877Sume		ret = res_querydomainN(name, NULL, target);
195861877Sume		if (ret > 0)
195961877Sume			return (ret);
196061877Sume		saved_herrno = h_errno;
196161877Sume		tried_as_is++;
196261877Sume	}
196361877Sume
196461877Sume	/*
196561877Sume	 * We do at least one level of search if
196661877Sume	 *	- there is no dot and RES_DEFNAME is set, or
196761877Sume	 *	- there is at least one dot, there is no trailing dot,
196861877Sume	 *	  and RES_DNSRCH is set.
196961877Sume	 */
197061877Sume	if ((!dots && (_res.options & RES_DEFNAMES)) ||
197161877Sume	    (dots && !trailing_dot && (_res.options & RES_DNSRCH))) {
197261877Sume		int done = 0;
197361877Sume
197461877Sume		for (domain = (const char * const *)_res.dnsrch;
197561877Sume		   *domain && !done;
197661877Sume		   domain++) {
197761877Sume
197861877Sume			ret = res_querydomainN(name, *domain, target);
197961877Sume			if (ret > 0)
198061877Sume				return (ret);
198161877Sume
198261877Sume			/*
198361877Sume			 * If no server present, give up.
198461877Sume			 * If name isn't found in this domain,
198561877Sume			 * keep trying higher domains in the search list
198661877Sume			 * (if that's enabled).
198761877Sume			 * On a NO_DATA error, keep trying, otherwise
198861877Sume			 * a wildcard entry of another type could keep us
198961877Sume			 * from finding this entry higher in the domain.
199061877Sume			 * If we get some other error (negative answer or
199161877Sume			 * server failure), then stop searching up,
199261877Sume			 * but try the input name below in case it's
199361877Sume			 * fully-qualified.
199461877Sume			 */
199561877Sume			if (errno == ECONNREFUSED) {
199661877Sume				h_errno = TRY_AGAIN;
199761877Sume				return (-1);
199861877Sume			}
199961877Sume
200061877Sume			switch (h_errno) {
200161877Sume			case NO_DATA:
200261877Sume				got_nodata++;
200361877Sume				/* FALLTHROUGH */
200461877Sume			case HOST_NOT_FOUND:
200561877Sume				/* keep trying */
200661877Sume				break;
200761877Sume			case TRY_AGAIN:
200861877Sume				if (hp->rcode == SERVFAIL) {
200961877Sume					/* try next search element, if any */
201061877Sume					got_servfail++;
201161877Sume					break;
201261877Sume				}
201361877Sume				/* FALLTHROUGH */
201461877Sume			default:
201561877Sume				/* anything else implies that we're done */
201661877Sume				done++;
201761877Sume			}
201861877Sume			/*
201961877Sume			 * if we got here for some reason other than DNSRCH,
202061877Sume			 * we only wanted one iteration of the loop, so stop.
202161877Sume			 */
202261877Sume			if (!(_res.options & RES_DNSRCH))
202361877Sume			        done++;
202461877Sume		}
202561877Sume	}
202661877Sume
202761877Sume	/*
202861877Sume	 * if we have not already tried the name "as is", do that now.
202961877Sume	 * note that we do this regardless of how many dots were in the
203061877Sume	 * name or whether it ends with a dot.
203161877Sume	 */
203261877Sume	if (!tried_as_is && (dots || !(_res.options & RES_NOTLDQUERY))) {
203361877Sume		ret = res_querydomainN(name, NULL, target);
203461877Sume		if (ret > 0)
203561877Sume			return (ret);
203661877Sume	}
203761877Sume
203861877Sume	/*
203961877Sume	 * if we got here, we didn't satisfy the search.
204061877Sume	 * if we did an initial full query, return that query's h_errno
204161877Sume	 * (note that we wouldn't be here if that query had succeeded).
204261877Sume	 * else if we ever got a nodata, send that back as the reason.
204361877Sume	 * else send back meaningless h_errno, that being the one from
204461877Sume	 * the last DNSRCH we did.
204561877Sume	 */
204661877Sume	if (saved_herrno != -1)
204761877Sume		h_errno = saved_herrno;
204861877Sume	else if (got_nodata)
204961877Sume		h_errno = NO_DATA;
205061877Sume	else if (got_servfail)
205161877Sume		h_errno = TRY_AGAIN;
205261877Sume	return (-1);
205361877Sume}
205461877Sume
205561877Sume/*
205661877Sume * Perform a call on res_query on the concatenation of name and domain,
205761877Sume * removing a trailing dot from name if domain is NULL.
205861877Sume */
205961877Sumestatic int
206061877Sumeres_querydomainN(name, domain, target)
206161877Sume	const char *name, *domain;
206261877Sume	struct res_target *target;
206361877Sume{
206461877Sume	char nbuf[MAXDNAME];
206561877Sume	const char *longname = nbuf;
206661877Sume	size_t n, d;
206761877Sume
206861877Sume	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
206961877Sume		h_errno = NETDB_INTERNAL;
207061877Sume		return (-1);
207161877Sume	}
207261877Sume#ifdef DEBUG
207361877Sume	if (_res.options & RES_DEBUG)
207461877Sume		printf(";; res_querydomain(%s, %s)\n",
207561877Sume			name, domain?domain:"<Nil>");
207661877Sume#endif
207761877Sume	if (domain == NULL) {
207861877Sume		/*
207961877Sume		 * Check for trailing '.';
208061877Sume		 * copy without '.' if present.
208161877Sume		 */
208261877Sume		n = strlen(name);
208361877Sume		if (n >= MAXDNAME) {
208461877Sume			h_errno = NO_RECOVERY;
208561877Sume			return (-1);
208661877Sume		}
208761877Sume		if (n > 0 && name[--n] == '.') {
208861877Sume			strncpy(nbuf, name, n);
208961877Sume			nbuf[n] = '\0';
209061877Sume		} else
209161877Sume			longname = name;
209261877Sume	} else {
209361877Sume		n = strlen(name);
209461877Sume		d = strlen(domain);
209561877Sume		if (n + d + 1 >= MAXDNAME) {
209661877Sume			h_errno = NO_RECOVERY;
209761877Sume			return (-1);
209861877Sume		}
2099105940Sume		snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
210061877Sume	}
210161877Sume	return (res_queryN(longname, target));
210261877Sume}
2103