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/*
This file is part of GNUnet.
(C) 2011 Christian Grothoff (and other contributing authors)
GNUnet 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 3, or (at your
option) any later version.
GNUnet 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 GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file nat/nat_mini.c
* @brief functions for interaction with miniupnp
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_nat_lib.h"
#include "nat.h"
/**
* Try to get the external IPv4 address of this peer.
* Note: calling this function may block this process
* for a few seconds (!).
*
* @param addr address to set
* @return GNUNET_OK on success,
* GNUNET_NO if the result is questionable,
* GNUNET_SYSERR on error
*/
int
GNUNET_NAT_mini_get_external_ipv4 (struct in_addr *addr)
{
struct GNUNET_OS_Process *eip;
struct GNUNET_DISK_PipeHandle *opipe;
const struct GNUNET_DISK_FileHandle *r;
size_t off;
char buf[17];
ssize_t ret;
int iret;
opipe = GNUNET_DISK_pipe (GNUNET_YES,
GNUNET_NO,
GNUNET_YES);
if (NULL == opipe)
return GNUNET_SYSERR;
eip = GNUNET_OS_start_process (NULL,
opipe,
"external-ip",
"external-ip", NULL);
if (NULL == eip)
{
GNUNET_DISK_pipe_close (opipe);
return GNUNET_SYSERR;
}
GNUNET_DISK_pipe_close_end (opipe, GNUNET_DISK_PIPE_END_WRITE);
iret = GNUNET_SYSERR;
r = GNUNET_DISK_pipe_handle (opipe,
GNUNET_DISK_PIPE_END_READ);
off = 0;
while (0 < (ret = GNUNET_DISK_file_read (r, &buf[off], sizeof (buf)-off)))
off += ret;
if ( (off > 7) &&
(buf[off-1] == '\n') )
{
buf[off-1] = '\0';
if (1 == inet_pton (AF_INET, buf, addr))
{
if (addr->s_addr == 0)
iret = GNUNET_NO; /* got 0.0.0.0 */
iret = GNUNET_OK;
}
}
(void) GNUNET_OS_process_kill (eip, SIGKILL);
GNUNET_OS_process_close (eip);
GNUNET_DISK_pipe_close (opipe);
return iret;
}
/* end of nat_mini.c */
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