/* $NetBSD: getaddrinfo.c,v 1.2 2017/01/28 21:31:50 christos Exp $ */
/*
* Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
*/
#include <config.h>
#include <krb5/roken.h>
/*
* uses hints->ai_socktype and hints->ai_protocol
*/
static int
get_port_protocol_socktype (const char *servname,
const struct addrinfo *hints,
int *port,
int *protocol,
int *socktype)
{
struct servent *se;
const char *proto_str = NULL;
*socktype = 0;
if (hints != NULL && hints->ai_protocol != 0) {
struct protoent *protoent = getprotobynumber (hints->ai_protocol);
if (protoent == NULL)
return EAI_SOCKTYPE; /* XXX */
proto_str = protoent->p_name;
*protocol = protoent->p_proto;
}
if (hints != NULL)
*socktype = hints->ai_socktype;
if (*socktype == SOCK_STREAM) {
se = getservbyname (servname, proto_str ? proto_str : "tcp");
if (proto_str == NULL)
*protocol = IPPROTO_TCP;
} else if (*socktype == SOCK_DGRAM) {
se = getservbyname (servname, proto_str ? proto_str : "udp");
if (proto_str == NULL)
*protocol = IPPROTO_UDP;
} else if (*socktype == 0) {
if (proto_str != NULL) {
se = getservbyname (servname, proto_str);
} else {
se = getservbyname (servname, "tcp");
*protocol = IPPROTO_TCP;
*socktype = SOCK_STREAM;
if (se == NULL) {
se = getservbyname (servname, "udp");
*protocol = IPPROTO_UDP;
*socktype = SOCK_DGRAM;
}
}
} else
return EAI_SOCKTYPE;
if (se == NULL) {
char *endstr;
*port = htons(strtol (servname, &endstr, 10));
if (servname == endstr)
return EAI_NONAME;
} else {
*port = se->s_port;
}
return 0;
}
static int
add_one (int port, int protocol, int socktype,
struct addrinfo ***ptr,
int (*func)(struct addrinfo *, void *data, int port),
void *data,
char *canonname)
{
struct addrinfo *a;
int ret;
a = malloc (sizeof (*a));
if (a == NULL)
return EAI_MEMORY;
memset (a, 0, sizeof(*a));
a->ai_flags = 0;
a->ai_next = NULL;
a->ai_protocol = protocol;
a->ai_socktype = socktype;
a->ai_canonname = canonname;
ret = (*func)(a, data, port);
if (ret) {
free (a);
return ret;
}
**ptr = a;
*ptr = &a->ai_next;
return 0;
}
static int
const_v4 (struct addrinfo *a, void *data, int port)
{
struct sockaddr_in *sin4;
struct in_addr *addr = (struct in_addr *)data;
a->ai_family = PF_INET;
a->ai_addrlen = sizeof(*sin4);
a->ai_addr = malloc (sizeof(*sin4));
if (a->ai_addr == NULL)
return EAI_MEMORY;
sin4 = (struct sockaddr_in *)a->ai_addr;
memset (sin4, 0, sizeof(*sin4));
sin4->sin_family = AF_INET;
sin4->sin_port = port;
sin4->sin_addr = *addr;
return 0;
}
#ifdef HAVE_IPV6
static int
const_v6 (struct addrinfo *a, void *data, int port)
{
struct sockaddr_in6 *sin6;
struct in6_addr *addr = (struct in6_addr *)data;
a->ai_family = PF_INET6;
a->ai_addrlen = sizeof(*sin6);
a->ai_addr = malloc (sizeof(*sin6));
if (a->ai_addr == NULL)
return EAI_MEMORY;
sin6 = (struct sockaddr_in6 *)a->ai_addr;
memset (sin6, 0, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_port = port;
sin6->sin6_addr = *addr;
return 0;
}
#endif
/* this is mostly a hack for some versions of AIX that has a prototype
for in6addr_loopback but no actual symbol in libc */
#if defined(HAVE_IPV6) && !defined(HAVE_IN6ADDR_LOOPBACK) && defined(IN6ADDR_LOOPBACK_INIT)
#define in6addr_loopback _roken_in6addr_loopback
struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
#endif
static int
get_null (const struct addrinfo *hints,
int port, int protocol, int socktype,
struct addrinfo **res)
{
struct in_addr v4_addr;
#ifdef HAVE_IPV6
struct in6_addr v6_addr;
#endif
struct addrinfo *first = NULL;
struct addrinfo **current = &first;
int family = PF_UNSPEC;
int ret;
if (hints != NULL)
family = hints->ai_family;
if (hints && hints->ai_flags & AI_PASSIVE) {
v4_addr.s_addr = INADDR_ANY;
#ifdef HAVE_IPV6
v6_addr = in6addr_any;
#endif
} else {
v4_addr.s_addr = htonl(INADDR_LOOPBACK);
#ifdef HAVE_IPV6
v6_addr = in6addr_loopback;
#endif
}
#ifdef HAVE_IPV6
if (family == PF_INET6 || family == PF_UNSPEC) {
ret = add_one (port, protocol, socktype,
¤t, const_v6, &v6_addr, NULL);
}
#endif
if (family == PF_INET || family == PF_UNSPEC) {
ret = add_one (port, protocol, socktype,
¤t, const_v4, &v4_addr, NULL);
}
*res = first;
return 0;
}
static int
add_hostent (int port, int protocol, int socktype,
struct addrinfo ***current,
int (*func)(struct addrinfo *, void *data, int port),
struct hostent *he, int *flags)
{
int ret;
char *canonname = NULL;
char **h;
if (*flags & AI_CANONNAME) {
struct hostent *he2 = NULL;
const char *tmp_canon;
tmp_canon = hostent_find_fqdn (he);
if (strchr (tmp_canon, '.') == NULL) {
int error;
he2 = getipnodebyaddr (he->h_addr_list[0], he->h_length,
he->h_addrtype, &error);
if (he2 != NULL) {
const char *tmp = hostent_find_fqdn (he2);
if (strchr (tmp, '.') != NULL)
tmp_canon = tmp;
}
}
canonname = strdup (tmp_canon);
if (he2 != NULL)
freehostent (he2);
if (canonname == NULL)
return EAI_MEMORY;
}
for (h = he->h_addr_list; *h != NULL; ++h) {
ret = add_one (port, protocol, socktype,
current, func, *h, canonname);
if (ret)
return ret;
if (*flags & AI_CANONNAME) {
*flags &= ~AI_CANONNAME;
canonname = NULL;
}
}
return 0;
}
static int
get_number (const char *nodename,
const struct addrinfo *hints,
int port, int protocol, int socktype,
struct addrinfo **res)
{
struct addrinfo *first = NULL;
struct addrinfo **current = &first;
int family = PF_UNSPEC;
int ret;
if (hints != NULL) {
family = hints->ai_family;
}
#ifdef HAVE_IPV6
if (family == PF_INET6 || family == PF_UNSPEC) {
struct in6_addr v6_addr;
if (inet_pton (PF_INET6, nodename, &v6_addr) == 1) {
ret = add_one (port, protocol, socktype,
¤t, const_v6, &v6_addr, NULL);
*res = first;
return ret;
}
}
#endif
if (family == PF_INET || family == PF_UNSPEC) {
struct in_addr v4_addr;
if (inet_pton (PF_INET, nodename, &v4_addr) == 1) {
ret = add_one (port, protocol, socktype,
¤t, const_v4, &v4_addr, NULL);
*res = first;
return ret;
}
}
return EAI_NONAME;
}
static int
get_nodes (const char *nodename,
const struct addrinfo *hints,
int port, int protocol, int socktype,
struct addrinfo **res)
{
struct addrinfo *first = NULL;
struct addrinfo **current = &first;
int family = PF_UNSPEC;
int flags = 0;
int ret = EAI_NONAME;
int error;
if (hints != NULL) {
family = hints->ai_family;
flags = hints->ai_flags;
}
#ifdef HAVE_IPV6
if (family == PF_INET6 || family == PF_UNSPEC) {
struct hostent *he;
he = getipnodebyname (nodename, PF_INET6, 0, &error);
if (he != NULL) {
ret = add_hostent (port, protocol, socktype,
¤t, const_v6, he, &flags);
freehostent (he);
}
}
#endif
if (family == PF_INET || family == PF_UNSPEC) {
struct hostent *he;
he = getipnodebyname (nodename, PF_INET, 0, &error);
if (he != NULL) {
ret = add_hostent (port, protocol, socktype,
¤t, const_v4, he, &flags);
freehostent (he);
}
}
*res = first;
return ret;
}
/*
* hints:
*
* struct addrinfo {
* int ai_flags;
* int ai_family;
* int ai_socktype;
* int ai_protocol;
* ...
* };
*/
ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
getaddrinfo(const char *nodename,
const char *servname,
const struct addrinfo *hints,
struct addrinfo **res)
{
int ret;
int port = 0;
int protocol = 0;
int socktype = 0;
*res = NULL;
if (servname == NULL && nodename == NULL)
return EAI_NONAME;
if (hints != NULL
&& hints->ai_family != PF_UNSPEC
&& hints->ai_family != PF_INET
#ifdef HAVE_IPV6
&& hints->ai_family != PF_INET6
#endif
)
return EAI_FAMILY;
if (servname != NULL) {
ret = get_port_protocol_socktype (servname, hints,
&port, &protocol, &socktype);
if (ret)
return ret;
}
if (nodename != NULL) {
ret = get_number (nodename, hints, port, protocol, socktype, res);
if (ret) {
if(hints && hints->ai_flags & AI_NUMERICHOST)
ret = EAI_NONAME;
else
ret = get_nodes (nodename, hints, port, protocol, socktype,
res);
}
} else {
ret = get_null (hints, port, protocol, socktype, res);
}
if (ret)
freeaddrinfo (*res);
return ret;
}