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/*
This file is part of GNUnet.
(C) 2010 Christian Grothoff
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 vpn/gnunet-helper-vpn-api.c
* @brief exposes the API (the convenience-functions) of dealing with the
* helper-vpn
* @author Philipp Toelke
*/
#include <platform.h>
#include <gnunet_common.h>
#include <gnunet_server_lib.h>
#include <gnunet_os_lib.h>
#include "gnunet-helper-vpn-api.h"
static void
stop_helper (struct GNUNET_VPN_HELPER_Handle *handle)
{
if (NULL == handle->helper_proc)
return;
GNUNET_OS_process_kill (handle->helper_proc, SIGKILL);
GNUNET_OS_process_wait (handle->helper_proc);
GNUNET_OS_process_close (handle->helper_proc);
handle->helper_proc = NULL;
GNUNET_DISK_pipe_close (handle->helper_in);
GNUNET_DISK_pipe_close (handle->helper_out);
GNUNET_SERVER_mst_destroy (handle->mst);
}
extern GNUNET_SCHEDULER_TaskIdentifier shs_task;
/**
* Read from the helper-process
*/
static void
helper_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tsdkctx)
{
struct GNUNET_VPN_HELPER_Handle *handle = cls;
/* no message can be bigger then 64k */
char buf[65535];
if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
return;
int t = GNUNET_DISK_file_read (handle->fh_from_helper, &buf, 65535);
/* On read-error, restart the helper */
if (t <= 0)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Read error for header from vpn-helper: %m\n");
stop_helper (handle);
/* Restart the helper */
shs_task =
GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS,
handle->restart_task, handle);
return;
}
if (GNUNET_SYSERR ==
GNUNET_SERVER_mst_receive (handle->mst, handle->client, buf, t, 0, 0))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "SYSERR from mst\n");
stop_helper (handle);
/* Restart the helper */
shs_task =
GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS,
handle->restart_task, handle);
return;
}
GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
handle->fh_from_helper, &helper_read, handle);
}
void
cleanup_helper (struct GNUNET_VPN_HELPER_Handle *handle)
{
stop_helper (handle);
GNUNET_free (handle);
}
struct GNUNET_VPN_HELPER_Handle *
start_helper (const char *ifname, const char *ipv6addr, const char *ipv6prefix,
const char *ipv4addr, const char *ipv4mask,
const char *process_name, GNUNET_SCHEDULER_Task restart_task,
GNUNET_SERVER_MessageTokenizerCallback cb, void *cb_cls)
{
struct GNUNET_VPN_HELPER_Handle *handle =
GNUNET_malloc (sizeof (struct GNUNET_VPN_HELPER_Handle));
handle->helper_in = GNUNET_DISK_pipe (GNUNET_YES, GNUNET_YES, GNUNET_NO);
handle->helper_out = GNUNET_DISK_pipe (GNUNET_YES, GNUNET_NO, GNUNET_YES);
handle->restart_task = restart_task;
if (handle->helper_in == NULL || handle->helper_out == NULL)
{
GNUNET_free (handle);
return NULL;
}
handle->helper_proc =
GNUNET_OS_start_process (handle->helper_in, handle->helper_out,
"gnunet-helper-vpn", process_name, ifname,
ipv6addr, ipv6prefix, ipv4addr, ipv4mask, NULL);
handle->fh_from_helper =
GNUNET_DISK_pipe_handle (handle->helper_out, GNUNET_DISK_PIPE_END_READ);
handle->fh_to_helper =
GNUNET_DISK_pipe_handle (handle->helper_in, GNUNET_DISK_PIPE_END_WRITE);
GNUNET_DISK_pipe_close_end (handle->helper_out, GNUNET_DISK_PIPE_END_WRITE);
GNUNET_DISK_pipe_close_end (handle->helper_in, GNUNET_DISK_PIPE_END_READ);
handle->mst = GNUNET_SERVER_mst_create (cb, cb_cls);
GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
handle->fh_from_helper, &helper_read, handle);
return handle;
}
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