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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-daemon-vpn.c
* @brief
* @author Philipp Tölke
*/
#include "platform.h"
#include "gnunet_getopt_lib.h"
#include "gnunet_program_lib.h"
#include "gnunet_os_lib.h"
#include "gnunet-vpn-helper-p.h"
#include "gnunet-vpn-packet.h"
#include "gnunet-vpn-pretty-print.h"
#include "gnunet_common.h"
#include "gnunet_protocols.h"
#include "gnunet_server_lib.h"
/* #include "gnunet_template_service.h" */
/**
* Final status code.
*/
static int ret;
struct vpn_cls {
struct GNUNET_DISK_PipeHandle* helper_in; // From the helper
struct GNUNET_DISK_PipeHandle* helper_out; // To the helper
const struct GNUNET_DISK_FileHandle* fh_from_helper;
struct GNUNET_SERVER_MessageStreamTokenizer* mst;
struct GNUNET_SCHEDULER_Handle *sched;
pid_t helper_pid;
};
static void cleanup(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
struct vpn_cls* mycls = (struct vpn_cls*) cls;
if (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) {
PLIBC_KILL(mycls->helper_pid, SIGTERM);
GNUNET_OS_process_wait(mycls->helper_pid);
}
}
static void helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx);
static void start_helper_and_schedule(struct vpn_cls* mycls) {
mycls->helper_in = GNUNET_DISK_pipe(1);
mycls->helper_out = GNUNET_DISK_pipe(1);
mycls->helper_pid = GNUNET_OS_start_process(mycls->helper_in, mycls->helper_out, "gnunet-vpn-helper", "gnunet-vpn-helper", NULL);
mycls->fh_from_helper = GNUNET_DISK_pipe_handle (mycls->helper_out, GNUNET_DISK_PIPE_END_READ);
GNUNET_DISK_pipe_close_end(mycls->helper_out, GNUNET_DISK_PIPE_END_WRITE);
GNUNET_DISK_pipe_close_end(mycls->helper_in, GNUNET_DISK_PIPE_END_READ);
GNUNET_SCHEDULER_add_read_file (mycls->sched, GNUNET_TIME_UNIT_FOREVER_REL, mycls->fh_from_helper, &helper_read, mycls);
}
static void restart_helper(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
// FIXME: Ratelimit this!
struct vpn_cls* mycls = (struct vpn_cls*) cls;
// Kill the helper
PLIBC_KILL(mycls->helper_pid, SIGKILL);
GNUNET_OS_process_wait(mycls->helper_pid);
// Restart the helper
start_helper_and_schedule(mycls);
}
static void helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx) {
struct vpn_cls* mycls = (struct vpn_cls*) cls;
char buf[65535];
if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
return;
int t = GNUNET_DISK_file_read(mycls->fh_from_helper, &buf, 65535);
if (t<=0) {
fprintf(stderr, "Read error for header: %m\n");
GNUNET_SCHEDULER_add_now(mycls->sched, restart_helper, cls);
return;
}
/* FIXME */ GNUNET_SERVER_mst_receive(mycls->mst, NULL, buf, t, 0, 0);
GNUNET_SCHEDULER_add_read_file (mycls->sched, GNUNET_TIME_UNIT_FOREVER_REL, mycls->fh_from_helper, &helper_read, mycls);
}
static void message_token(void *cls, void *client, const struct GNUNET_MessageHeader *message) {
if (ntohs(message->type) != GNUNET_MESSAGE_TYPE_VPN_HELPER) return;
struct ip6_pkt *pkt6 = (struct ip6_pkt*) message;
struct ip6_tcp *pkt6_tcp;
struct ip6_udp *pkt6_udp;
pkt_printf(pkt6);
switch(pkt6->ip6_hdr.nxthdr) {
case 0x06:
pkt6_tcp = (struct ip6_tcp*)pkt6;
pkt_printf_ip6tcp(pkt6_tcp);
break;
case 0x11:
pkt6_udp = (struct ip6_udp*)pkt6;
pkt_printf_ip6udp(pkt6_udp);
if (ntohs(pkt6_udp->udp_hdr.dpt) == 53) {
pkt_printf_ip6dns((struct ip6_udp_dns*)pkt6_udp);
}
break;
}
}
/**
* Main function that will be run by the scheduler.
*
* @param cls closure
* @param sched the scheduler to use
* @param args remaining command-line arguments
* @param cfgfile name of the configuration file used (for saving, can be NULL!)
* @param cfg configuration
*/
static void
run (void *cls,
struct GNUNET_SCHEDULER_Handle *sched,
char *const *args,
const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *cfg) {
struct vpn_cls* mycls = (struct vpn_cls*) cls;
mycls->sched = sched;
mycls->mst = GNUNET_SERVER_mst_create(&message_token, mycls);
GNUNET_SCHEDULER_add_delayed(sched, GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
start_helper_and_schedule(mycls);
}
/**
* The main function to obtain template from gnunetd.
*
* @param argc number of arguments from the command line
* @param argv command line arguments
* @return 0 ok, 1 on error
*/
int
main (int argc, char *const *argv)
{
static const struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_OPTION_END
};
struct vpn_cls* cls = GNUNET_malloc(sizeof(struct vpn_cls));
return (GNUNET_OK ==
GNUNET_PROGRAM_run (argc,
argv,
"gnunet-daemon-vpn",
gettext_noop ("help text"),
options, &run, cls)) ? ret : 1;
GNUNET_free(cls); // Make clang happy
}
/* end of gnunet-daemon-vpn.c */
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