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/* $Id$ */
/*
* Copyright (C)2003-2007 Benny Prijono <benny@prijono.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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pj/addr_resolv.h>
#include <pj/assert.h>
#include <pj/string.h>
#include <pj/errno.h>
#include <pj/compat/socket.h>
PJ_DEF(pj_status_t) pj_gethostbyname(const pj_str_t *hostname, pj_hostent *phe)
{
struct hostent *he;
char copy[PJ_MAX_HOSTNAME];
pj_assert(hostname && hostname ->slen < PJ_MAX_HOSTNAME);
if (hostname->slen >= PJ_MAX_HOSTNAME)
return PJ_ENAMETOOLONG;
pj_memcpy(copy, hostname->ptr, hostname->slen);
copy[ hostname->slen ] = '\0';
he = gethostbyname(copy);
if (!he) {
return pj_get_netos_error();
}
phe->h_name = he->h_name;
phe->h_aliases = he->h_aliases;
phe->h_addrtype = he->h_addrtype;
phe->h_length = he->h_length;
phe->h_addr_list = he->h_addr_list;
return PJ_SUCCESS;
}
/* Resolve the IP address of local machine */
pj_status_t pj_gethostip(pj_in_addr *addr)
{
const pj_str_t *hostname = pj_gethostname();
struct pj_hostent he;
pj_str_t cp;
pj_in_addr loopip;
pj_status_t status;
cp = pj_str("127.0.0.1");
loopip = pj_inet_addr(&cp);
#ifdef _MSC_VER
/* Get rid of "uninitialized he variable" with MS compilers */
pj_bzero(&he, sizeof(he));
#endif
/* Try with resolving local hostname first */
status = pj_gethostbyname(hostname, &he);
if (status == PJ_SUCCESS) {
*addr = *(pj_in_addr*)he.h_addr;
}
/* If we end up with 127.0.0.1, resolve the IP by getting the default
* interface to connect to some public host.
*/
if (status != PJ_SUCCESS || addr->s_addr == loopip.s_addr) {
pj_sock_t fd;
pj_sockaddr_in a;
int len;
status = pj_sock_socket(PJ_AF_INET, PJ_SOCK_DGRAM, 0, &fd);
if (status != PJ_SUCCESS) {
return status;
}
cp = pj_str("1.1.1.1");
pj_sockaddr_in_init(&a, &cp, 53);
status = pj_sock_connect(fd, &a, sizeof(a));
if (status != PJ_SUCCESS) {
pj_sock_close(fd);
/* Return 127.0.0.1 as the address */
return PJ_SUCCESS;
}
len = sizeof(a);
status = pj_sock_getsockname(fd, &a, &len);
if (status != PJ_SUCCESS) {
pj_sock_close(fd);
/* Return 127.0.0.1 as the address */
return PJ_SUCCESS;
}
pj_sock_close(fd);
*addr = a.sin_addr;
}
return status;
}
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