freebsd-dev/lib/libc/net/getaddrinfo.c
Yoshinobu Inoue e6f35403c1 Change getaddrinfo() resolve order
from
  all AAAA trial, then all A trial
to
  try AAAA and A for each trial

TODO: more fix for the case where IPv4 mapped IPv6 addr is disabled

Reviewed by: ume
2000-04-20 03:31:40 +00:00

907 lines
21 KiB
C

/*
* 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.
*
* $FreeBSD$
*/
/*
* "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
*
* Issues to be discussed:
* - Thread safe-ness must be checked.
* - Return values. There are nonstandard return values defined and used
* in the source code. This is because RFC2553 is silent about which error
* code must be returned for which situation.
* Note:
* - We use getipnodebyname() just for thread-safeness. There's no intent
* to let it do PF_UNSPEC (actually we never pass PF_UNSPEC to
* getipnodebyname().
* - The code filters out AFs that are not supported by the kernel,
* when globbing NULL hostname (to loopback, or wildcard). Is it the right
* thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG
* in ai_flags?
*/
#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 <netdb.h>
#include <resolv.h>
#include <string.h>
#include <stdlib.h>
#include <stddef.h>
#include <ctype.h>
#include <unistd.h>
#include <stdio.h>
#if defined(__KAME__) && defined(INET6)
# define FAITH
#endif
#define SUCCESS 0
#define ANY 0
#define YES 1
#define NO 0
static const char in_addrany[] = { 0, 0, 0, 0 };
static const char in6_addrany[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
static const char in_loopback[] = { 127, 0, 0, 1 };
static const char in6_loopback[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
};
static const struct afd {
int a_af;
int a_addrlen;
int a_socklen;
int a_off;
const char *a_addrany;
const char *a_loopback;
int a_scoped;
} afdl [] = {
#ifdef INET6
#define N_INET6 0
{PF_INET6, sizeof(struct in6_addr),
sizeof(struct sockaddr_in6),
offsetof(struct sockaddr_in6, sin6_addr),
in6_addrany, in6_loopback, 1},
#define N_INET 1
#else
#define N_INET 0
#endif
{PF_INET, sizeof(struct in_addr),
sizeof(struct sockaddr_in),
offsetof(struct sockaddr_in, sin_addr),
in_addrany, in_loopback, 0},
{0, 0, 0, 0, NULL, NULL, 0},
};
struct explore {
int e_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[] = {
{ SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
{ SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
{ SOCK_RAW, ANY, NULL, 0x05 },
{ 0, 0, NULL, 0 },
};
#ifdef INET6
#define PTON_MAX 16
#else
#define PTON_MAX 4
#endif
extern struct hostent * _getipnodebyname_multi __P((const char *name,
int af, int flags, int *errp));
static int str_isnumber __P((const char *));
static int explore_fqdn __P((const struct addrinfo *, const char *,
const char *, struct addrinfo **));
static int explore_null __P((const struct addrinfo *, const char *,
const char *, struct addrinfo **));
static int explore_numeric __P((const struct addrinfo *, const char *,
const char *, struct addrinfo **));
static int explore_numeric_scope __P((const struct addrinfo *, const char *,
const char *, struct addrinfo **));
static int get_canonname __P((const struct addrinfo *,
struct addrinfo *, const char *));
static struct addrinfo *get_ai __P((const struct addrinfo *,
const struct afd *, const char *));
static int get_portmatch __P((const struct addrinfo *, const char *));
static int get_port __P((struct addrinfo *, const char *, int));
static const struct afd *find_afd __P((int));
static char *ai_errlist[] = {
"Success",
"Address family for hostname not supported", /* EAI_ADDRFAMILY */
"Temporary failure in name resolution", /* EAI_AGAIN */
"Invalid value for ai_flags", /* EAI_BADFLAGS */
"Non-recoverable failure in name resolution", /* EAI_FAIL */
"ai_family not supported", /* EAI_FAMILY */
"Memory allocation failure", /* EAI_MEMORY */
"No address associated with hostname", /* EAI_NODATA */
"hostname nor servname provided, or not known", /* EAI_NONAME */
"servname not supported for ai_socktype", /* EAI_SERVICE */
"ai_socktype not supported", /* EAI_SOCKTYPE */
"System error returned in errno", /* EAI_SYSTEM */
"Invalid value for hints", /* EAI_BADHINTS */
"Resolved protocol is unknown", /* EAI_PROTOCOL */
"Argument res is NULL", /* EAI_RESNULL */
"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 (0)
#define GET_PORT(ai, serv) \
do { \
/* external reference: error and label free */ \
error = get_port((ai), (serv), 0); \
if (error != 0) \
goto free; \
} while (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 (0)
#define ERR(err) \
do { \
/* external reference: error, and label bad */ \
error = (err); \
goto bad; \
} while (0)
#define MATCH_FAMILY(x, y, w) \
((x) == (y) || ((w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
#define MATCH(x, y, w) \
((x) == (y) || ((w) && ((x) == ANY || (y) == ANY)))
char *
gai_strerror(ecode)
int ecode;
{
if (ecode < 0 || ecode > EAI_MAX)
ecode = EAI_MAX;
return ai_errlist[ecode];
}
void
freeaddrinfo(ai)
struct addrinfo *ai;
{
struct addrinfo *next;
do {
next = ai->ai_next;
if (ai->ai_canonname)
free(ai->ai_canonname);
/* no need to free(ai->ai_addr) */
free(ai);
} while ((ai = next) != NULL);
}
static int
str_isnumber(p)
const char *p;
{
char *q = (char *)p;
while (*q) {
if (! isdigit(*q))
return NO;
q++;
}
return YES;
}
int
getaddrinfo(hostname, servname, hints, res)
const char *hostname, *servname;
const struct addrinfo *hints;
struct addrinfo **res;
{
struct addrinfo sentinel;
struct addrinfo *cur;
int error = 0;
struct addrinfo ai;
struct addrinfo ai0;
struct addrinfo *pai;
const struct afd *afd;
const struct explore *ex;
sentinel.ai_next = NULL;
cur = &sentinel;
pai = &ai;
pai->ai_flags = 0;
pai->ai_family = PF_UNSPEC;
pai->ai_socktype = ANY;
pai->ai_protocol = ANY;
pai->ai_addrlen = 0;
pai->ai_canonname = NULL;
pai->ai_addr = NULL;
pai->ai_next = NULL;
if (hostname == NULL && servname == NULL)
return EAI_NONAME;
if (res == NULL)
return EAI_RESNULL; /* xxx */
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) {
int matched = 0;
for (ex = explore; ex->e_socktype; ex++) {
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)
matched = 1;
else
continue;
if (matched == 0)
ERR(EAI_BADHINTS);
}
}
}
/* backup original pai contents */
ai0 = *pai;
/*
* special cases check for inet and inet6 sockets.
* (1) servname is disallowed for raw sockets.
* (2) numeric servname is disallowed if socktype/protocol is left
* unspecified.
*/
if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
#ifdef INET6
|| MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
#endif
) {
*pai = ai0;
if (pai->ai_family == PF_UNSPEC)
#ifdef INET6
pai->ai_family = PF_INET6;
#else
pai->ai_family = PF_INET;
#endif
error = get_portmatch(pai, servname);
if (error)
ERR(error);
}
/* NULL hostname, or numeric hostname */
for (afd = afdl; afd->a_af; afd++)
{
for (ex = explore; ex->e_socktype; ex++) {
*pai = ai0;
if (!MATCH_FAMILY(pai->ai_family, afd->a_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 = afd->a_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, hostname, servname, &cur->ai_next);
else
error = explore_numeric_scope(pai, hostname, servname, &cur->ai_next);
if (error)
goto free;
while (cur && cur->ai_next)
cur = cur->ai_next;
}
}
/*
* XXX
* If numreic representation of AF1 can be interpreted as FQDN
* representation of AF2, we need to think again about the code below.
*/
if (sentinel.ai_next)
goto good;
if (pai->ai_flags & AI_NUMERICHOST)
ERR(EAI_NONAME);
if (hostname == NULL)
ERR(EAI_NONAME);
/* hostname as alphabetical name. */
{
for (ex = explore; ex->e_socktype; ex++) {
*pai = ai0;
if (!MATCH(pai->ai_socktype, ex->e_socktype,
WILD_SOCKTYPE(ex))) {
continue;
}
if (!MATCH(pai->ai_protocol, ex->e_protocol,
WILD_PROTOCOL(ex))) {
continue;
}
if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
pai->ai_socktype = ex->e_socktype;
if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
pai->ai_protocol = ex->e_protocol;
error = explore_fqdn(pai, hostname, servname,
&cur->ai_next);
while (cur && cur->ai_next)
cur = cur->ai_next;
}
}
/* XXX: if any addrinfo found, SUCCESS return even if (error != 0) */
if (sentinel.ai_next) {
good:
*res = sentinel.ai_next;
return SUCCESS;
}
/* else, failed */
free:
bad:
if (error == 0)
error = EAI_FAIL;
if (sentinel.ai_next)
freeaddrinfo(sentinel.ai_next);
*res = NULL;
return error;
}
/*
* FQDN hostname, DNS lookup
*/
static int
explore_fqdn(pai, hostname, servname, res)
const struct addrinfo *pai;
const char *hostname;
const char *servname;
struct addrinfo **res;
{
struct hostent *hp;
int h_error;
int af;
char *ap;
struct addrinfo sentinel, *cur;
int i;
const struct afd *afd;
int error;
*res = NULL;
sentinel.ai_next = NULL;
cur = &sentinel;
/*
* if the servname does not match socktype/protocol, ignore it.
*/
if (get_portmatch(pai, servname) != 0)
return 0;
hp = _getipnodebyname_multi(hostname, pai->ai_family, AI_ADDRCONFIG,
&h_error);
if (hp == NULL) {
switch (h_error) {
case HOST_NOT_FOUND:
case NO_DATA:
error = EAI_NODATA;
break;
case TRY_AGAIN:
error = EAI_AGAIN;
break;
case NO_RECOVERY:
case NETDB_INTERNAL:
default:
error = EAI_FAIL;
break;
}
} else if ((hp->h_name == NULL) || (hp->h_name[0] == 0)
|| (hp->h_addr_list[0] == NULL)) {
freehostent(hp);
hp = NULL;
error = EAI_FAIL;
}
if (hp == NULL)
goto free;
for (i = 0; hp->h_addr_list[i] != NULL; i++) {
af = hp->h_addrtype;
ap = hp->h_addr_list[i];
if (pai->ai_family != AF_UNSPEC && af != pai->ai_family)
continue;
afd = find_afd(af);
if (afd == NULL)
continue;
GET_AI(cur->ai_next, afd, ap);
GET_PORT(cur->ai_next, servname);
if ((pai->ai_flags & AI_CANONNAME) != 0) {
/*
* RFC2553 says that ai_canonname will be set only for
* the first element. we do it for all the elements,
* just for convenience.
*/
GET_CANONNAME(cur->ai_next, hp->h_name);
}
while (cur && cur->ai_next)
cur = cur->ai_next;
}
*res = sentinel.ai_next;
return 0;
free:
if (hp)
freehostent(hp);
if (sentinel.ai_next)
freeaddrinfo(sentinel.ai_next);
return error;
}
/*
* hostname == NULL.
* passive socket -> anyaddr (0.0.0.0 or ::)
* non-passive socket -> localhost (127.0.0.1 or ::1)
*/
static int
explore_null(pai, hostname, servname, res)
const struct addrinfo *pai;
const char *hostname;
const char *servname;
struct addrinfo **res;
{
int s;
const struct afd *afd;
struct addrinfo *cur;
struct addrinfo sentinel;
int error;
*res = NULL;
sentinel.ai_next = NULL;
cur = &sentinel;
/*
* filter out AFs that are not supported by the kernel
* XXX errno?
*/
s = socket(pai->ai_family, SOCK_DGRAM, 0);
if (s < 0)
return 0;
_close(s);
afd = find_afd(pai->ai_family);
if (afd == NULL)
return 0;
GET_AI(cur->ai_next, afd,
(pai->ai_flags & AI_PASSIVE) ? afd->a_addrany : afd->a_loopback
);
/* xxx meaningless?
* GET_CANONNAME(cur->ai_next, "anyaddr");
* or
* GET_CANONNAME(cur->ai_next, "localhost");
*/
/* if the servname does not match socktype/protocol, ignored */
GET_PORT(cur->ai_next, servname);
*res = sentinel.ai_next;
return 0;
free:
if (sentinel.ai_next)
freeaddrinfo(sentinel.ai_next);
return error;
}
/*
* numeric hostname
*/
static int
explore_numeric(pai, hostname, servname, res)
const struct addrinfo *pai;
const char *hostname;
const char *servname;
struct addrinfo **res;
{
const struct afd *afd;
struct addrinfo *cur;
struct addrinfo sentinel;
int error;
char pton[PTON_MAX];
int flags;
*res = NULL;
sentinel.ai_next = NULL;
cur = &sentinel;
/*
* if the servname does not match socktype/protocol, ignore it.
*/
if (get_portmatch(pai, servname) != 0)
return 0;
afd = find_afd(pai->ai_family);
if (afd == NULL)
return 0;
flags = pai->ai_flags;
if ((afd->a_af == AF_INET
? inet_aton(hostname, (struct in_addr *)pton)
: inet_pton(afd->a_af, hostname, pton)) == 1) {
if (pai->ai_family == afd->a_af ||
pai->ai_family == PF_UNSPEC /*?*/) {
GET_AI(cur->ai_next, afd, pton);
GET_PORT(cur->ai_next, servname);
while (cur && cur->ai_next)
cur = cur->ai_next;
} else
ERR(EAI_FAMILY); /*xxx*/
}
*res = sentinel.ai_next;
return 0;
free:
bad:
if (sentinel.ai_next)
freeaddrinfo(sentinel.ai_next);
return error;
}
/*
* numeric hostname with scope
*/
static int
explore_numeric_scope(pai, hostname, servname, res)
const struct addrinfo *pai;
const char *hostname;
const char *servname;
struct addrinfo **res;
{
#ifndef SCOPE_DELIMITER
return explore_numeric(pai, hostname, servname, res);
#else
const struct afd *afd;
struct addrinfo *cur;
int error;
char *cp, *hostname2 = NULL;
int scope;
#ifdef INET6
struct sockaddr_in6 *sin6;
#endif
/*
* if the servname does not match socktype/protocol, ignore it.
*/
if (get_portmatch(pai, servname) != 0)
return 0;
afd = find_afd(pai->ai_family);
if (afd == NULL)
return 0;
if (!afd->a_scoped)
return explore_numeric(pai, hostname, servname, res);
cp = strchr(hostname, SCOPE_DELIMITER);
if (cp == NULL)
return explore_numeric(pai, hostname, servname, res);
/*
* Handle special case of <scoped_address><delimiter><scope id>
*/
hostname2 = strdup(hostname);
if (hostname2 == NULL)
return EAI_MEMORY;
/* terminate at the delimiter */
hostname2[cp - hostname] = '\0';
cp++;
switch (pai->ai_family) {
#ifdef INET6
case AF_INET6:
scope = if_nametoindex(cp);
if (scope == 0) {
error = EAI_SYSTEM;
goto free;
}
break;
#endif
}
error = explore_numeric(pai, hostname2, servname, res);
if (error == 0) {
for (cur = *res; cur; cur = cur->ai_next) {
#ifdef INET6
if (cur->ai_family != AF_INET6)
continue;
sin6 = (struct sockaddr_in6 *)cur->ai_addr;
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
IN6_IS_ADDR_MC_LINKLOCAL(&sin6->sin6_addr))
sin6->sin6_scope_id = scope;
#endif
}
}
#ifdef INET6
free:
#endif
free(hostname2);
return error;
#endif
}
static int
get_canonname(pai, ai, str)
const struct addrinfo *pai;
struct addrinfo *ai;
const char *str;
{
if ((pai->ai_flags & AI_CANONNAME) != 0) {
ai->ai_canonname = (char *)malloc(strlen(str) + 1);
if (ai->ai_canonname == NULL)
return EAI_MEMORY;
strcpy(ai->ai_canonname, str);
}
return 0;
}
static struct addrinfo *
get_ai(pai, afd, addr)
const struct addrinfo *pai;
const struct afd *afd;
const char *addr;
{
char *p;
struct addrinfo *ai;
#ifdef FAITH
struct in6_addr faith_prefix;
char *fp_str;
int translate = 0;
#endif
#ifdef FAITH
/*
* Transfrom an IPv4 addr into a special IPv6 addr format for
* IPv6->IPv4 translation gateway. (only TCP is supported now)
*
* +-----------------------------------+------------+
* | faith prefix part (12 bytes) | embedded |
* | | IPv4 addr part (4 bytes)
* +-----------------------------------+------------+
*
* faith prefix part is specified as ascii IPv6 addr format
* in environmental variable GAI.
* For FAITH to work correctly, routing to faith prefix must be
* setup toward a machine where a FAITH daemon operates.
* Also, the machine must enable some mechanizm
* (e.g. faith interface hack) to divert those packet with
* faith prefixed destination addr to user-land FAITH daemon.
*/
fp_str = getenv("GAI");
if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 &&
afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) {
u_int32_t v4a;
u_int8_t v4a_top;
memcpy(&v4a, addr, sizeof v4a);
v4a_top = v4a >> IN_CLASSA_NSHIFT;
if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) &&
v4a_top != 0 && v4a != IN_LOOPBACKNET) {
afd = &afdl[N_INET6];
memcpy(&faith_prefix.s6_addr[12], addr,
sizeof(struct in_addr));
translate = 1;
}
}
#endif
ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
+ (afd->a_socklen));
if (ai == NULL)
return NULL;
memcpy(ai, pai, sizeof(struct addrinfo));
ai->ai_addr = (struct sockaddr *)(ai + 1);
memset(ai->ai_addr, 0, afd->a_socklen);
ai->ai_addr->sa_len = afd->a_socklen;
ai->ai_addrlen = afd->a_socklen;
ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
p = (char *)(ai->ai_addr);
#ifdef FAITH
if (translate == 1)
memcpy(p + afd->a_off, &faith_prefix, afd->a_addrlen);
else
#endif
memcpy(p + afd->a_off, addr, afd->a_addrlen);
return ai;
}
static int
get_portmatch(ai, servname)
const struct addrinfo *ai;
const char *servname;
{
/* get_port does not touch first argument. when matchonly == 1. */
return get_port((struct addrinfo *)ai, servname, 1);
}
static int
get_port(ai, servname, matchonly)
struct addrinfo *ai;
const char *servname;
int matchonly;
{
const char *proto;
struct servent *sp;
int port;
int allownumeric;
if (servname == NULL)
return 0;
if (ai->ai_family != AF_INET
#ifdef INET6
&& ai->ai_family != AF_INET6
#endif
)
return 0;
switch (ai->ai_socktype) {
case SOCK_RAW:
return EAI_SERVICE;
case SOCK_DGRAM:
case SOCK_STREAM:
allownumeric = 1;
break;
case ANY:
allownumeric = 0;
break;
default:
return EAI_SOCKTYPE;
}
if (str_isnumber(servname)) {
if (!allownumeric)
return EAI_SERVICE;
port = htons(atoi(servname));
if (port < 0 || port > 65535)
return EAI_SERVICE;
} else {
switch (ai->ai_socktype) {
case SOCK_DGRAM:
proto = "udp";
break;
case SOCK_STREAM:
proto = "tcp";
break;
default:
proto = NULL;
break;
}
if ((sp = getservbyname(servname, proto)) == NULL)
return EAI_SERVICE;
port = sp->s_port;
}
if (!matchonly) {
switch (ai->ai_family) {
case AF_INET:
((struct sockaddr_in *)ai->ai_addr)->sin_port = port;
break;
#ifdef INET6
case AF_INET6:
((struct sockaddr_in6 *)ai->ai_addr)->sin6_port = port;
break;
#endif
}
}
return 0;
}
static const struct afd *
find_afd(af)
int af;
{
const struct afd *afd;
if (af == PF_UNSPEC)
return NULL;
for (afd = afdl; afd->a_af; afd++) {
if (afd->a_af == af)
return afd;
}
return NULL;
}