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/* Get address information (partial implementation).
Copyright (C) 1997, 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
Contributed by Simon Josefsson <simon@josefsson.org>.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "getaddrinfo.h"
#if HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
/* Get calloc. */
#include <stdlib.h>
/* Get memcpy. */
#include <string.h>
#include <stdbool.h>
#include "gettext.h"
#define _(String) gettext (String)
#define N_(String) String
#include "strdup.h"
static inline bool
validate_family (int family)
{
/* FIXME: Support more families. */
#if HAVE_IPV4
if (family == PF_INET)
return true;
#endif
#if HAVE_IPV6
if (family == PF_INET6)
return true;
#endif
if (family == PF_UNSPEC)
return true;
return false;
}
/* Translate name of a service location and/or a service name to set of
socket addresses. */
int
getaddrinfo (const char *restrict nodename,
const char *restrict servname,
const struct addrinfo *restrict hints,
struct addrinfo **restrict res)
{
struct addrinfo *tmp;
struct servent *se = NULL;
struct hostent *he;
void *storage;
size_t size;
#if HAVE_IPV6
struct v6_pair {
struct addrinfo addrinfo;
struct sockaddr_in6 sockaddr_in6;
};
#endif
#if HAVE_IPV4
struct v4_pair {
struct addrinfo addrinfo;
struct sockaddr_in sockaddr_in;
};
#endif
if (hints && (hints->ai_flags & ~AI_CANONNAME))
/* FIXME: Support more flags. */
return EAI_BADFLAGS;
if (hints && !validate_family (hints->ai_family))
return EAI_FAMILY;
if (hints &&
hints->ai_socktype != SOCK_STREAM && hints->ai_socktype != SOCK_DGRAM)
/* FIXME: Support other socktype. */
return EAI_SOCKTYPE; /* FIXME: Better return code? */
if (!nodename)
/* FIXME: Support server bind mode. */
return EAI_NONAME;
if (servname)
{
const char *proto =
(hints && hints->ai_socktype == SOCK_DGRAM) ? "udp" : "tcp";
/* FIXME: Use getservbyname_r if available. */
se = getservbyname (servname, proto);
if (!se)
return EAI_SERVICE;
}
/* FIXME: Use gethostbyname_r if available. */
he = gethostbyname (nodename);
if (!he || he->h_addr_list[0] == NULL)
return EAI_NONAME;
switch (he->h_addrtype)
{
#if HAVE_IPV6
case PF_INET6:
size = sizeof (struct v6_pair);
break;
#endif
#if HAVE_IPV4
case PF_INET:
size = sizeof (struct v4_pair);
break;
#endif
default:
return EAI_NODATA;
}
storage = calloc (1, size);
if (!storage)
return EAI_MEMORY;
switch (he->h_addrtype)
{
#if HAVE_IPV6
case PF_INET6:
{
struct v6_pair *p = storage;
struct sockaddr_in6 *sinp = &p->sockaddr_in6;
tmp = &p->addrinfo;
if (se)
sinp->sin6_port = se->s_port;
if (he->h_length != sizeof (sinp->sin6_addr))
{
free (storage);
return EAI_SYSTEM; /* FIXME: Better return code? Set errno? */
}
memcpy (&sinp->sin6_addr, he->h_addr_list[0], sizeof sinp->sin6_addr);
tmp->ai_addr = (struct sockaddr *) sinp;
tmp->ai_addrlen = sizeof *sinp;
}
break;
#endif
#if HAVE_IPV4
case PF_INET:
{
struct v4_pair *p = storage;
struct sockaddr_in *sinp = &p->sockaddr_in;
tmp = &p->addrinfo;
if (se)
sinp->sin_port = se->s_port;
if (he->h_length != sizeof (sinp->sin_addr))
{
free (storage);
return EAI_SYSTEM; /* FIXME: Better return code? Set errno? */
}
memcpy (&sinp->sin_addr, he->h_addr_list[0], sizeof sinp->sin_addr);
tmp->ai_addr = (struct sockaddr *) sinp;
tmp->ai_addrlen = sizeof *sinp;
}
break;
#endif
default:
free (storage);
return EAI_NODATA;
}
if (hints && hints->ai_flags & AI_CANONNAME)
{
const char *cn;
if (he->h_name)
cn = he->h_name;
else
cn = nodename;
tmp->ai_canonname = strdup (cn);
if (!tmp->ai_canonname)
{
free (storage);
return EAI_MEMORY;
}
}
tmp->ai_protocol = (hints) ? hints->ai_protocol : 0;
tmp->ai_socktype = (hints) ? hints->ai_socktype : 0;
tmp->ai_addr->sa_family = he->h_addrtype;
/* FIXME: If more than one address, create linked list of addrinfo's. */
*res = tmp;
return 0;
}
/* Free `addrinfo' structure AI including associated storage. */
void
freeaddrinfo (struct addrinfo *ai)
{
while (ai)
{
struct addrinfo *cur;
cur = ai;
ai = ai->ai_next;
if (cur->ai_canonname) free (cur->ai_canonname);
free (cur);
}
}
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