src/vpn/gnunet-daemon-vpn.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2010 Christian Grothoff
   4
   5      GNUnet is free software; you can redistribute it and/or modify
   6      it under the terms of the GNU General Public License as published
   7      by the Free Software Foundation; either version 3, or (at your
   8      option) any later version.
   9
  10      GNUnet is distributed in the hope that it will be useful, but
  11      WITHOUT ANY WARRANTY; without even the implied warranty of
  12      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13      General Public License for more details.
  14
  15      You should have received a copy of the GNU General Public License
  16      along with GNUnet; see the file COPYING.  If not, write to the
  17      Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18      Boston, MA 02111-1307, USA.
  19 */
  20
  21 /**
  22  * @file vpn/gnunet-daemon-vpn.c
  23  * @brief
  24  * @author Philipp Tölke
  25  */
  26 #include "platform.h"
  27 #include "gnunet_getopt_lib.h"
  28 #include "gnunet_program_lib.h"
  29 #include "gnunet_os_lib.h"
  30 #include "gnunet-vpn-helper-p.h"
  31 #include "gnunet-vpn-packet.h"
  32 #include "gnunet-vpn-pretty-print.h"
  33 #include "gnunet_common.h"
  34 #include "gnunet_protocols.h"
  35 #include "gnunet_server_lib.h"
  36
  37 /**
  38  * Final status code.
  39  */
  40 static int ret;
  41
  42 struct vpn_cls {
  43         struct GNUNET_DISK_PipeHandle* helper_in; // From the helper
  44         struct GNUNET_DISK_PipeHandle* helper_out; // To the helper
  45         const struct GNUNET_DISK_FileHandle* fh_from_helper;
  46
  47         struct GNUNET_SERVER_MessageStreamTokenizer* mst;
  48
  49         struct GNUNET_SCHEDULER_Handle *sched;
  50
  51         pid_t helper_pid;
  52 };
  53
  54 static struct vpn_cls mycls;
  55
  56 static void cleanup(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
  57         if (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) {
  58                 PLIBC_KILL(mycls.helper_pid, SIGTERM);
  59                 GNUNET_OS_process_wait(mycls.helper_pid);
  60         }
  61 }
  62
  63 static void helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx);
  64
  65 static void start_helper_and_schedule() {
  66         mycls.helper_in = GNUNET_DISK_pipe(1);
  67         mycls.helper_out = GNUNET_DISK_pipe(1);
  68
  69         mycls.helper_pid = GNUNET_OS_start_process(mycls.helper_in, mycls.helper_out, "gnunet-helper-vpn", "gnunet-helper-vpn", NULL);
  70
  71         mycls.fh_from_helper = GNUNET_DISK_pipe_handle (mycls.helper_out, GNUNET_DISK_PIPE_END_READ);
  72
  73         GNUNET_DISK_pipe_close_end(mycls.helper_out, GNUNET_DISK_PIPE_END_WRITE);
  74         GNUNET_DISK_pipe_close_end(mycls.helper_in, GNUNET_DISK_PIPE_END_READ);
  75
  76         GNUNET_SCHEDULER_add_read_file (mycls.sched, GNUNET_TIME_UNIT_FOREVER_REL, mycls.fh_from_helper, &helper_read, NULL);
  77 }
  78
  79
  80 static void restart_helper(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
  81         // FIXME: Ratelimit this!
  82
  83         // Kill the helper
  84         PLIBC_KILL(mycls.helper_pid, SIGKILL);
  85         GNUNET_OS_process_wait(mycls.helper_pid);
  86
  87         // Restart the helper
  88         start_helper_and_schedule(mycls);
  89
  90 }
  91
  92 static void helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx) {
  93         char buf[65535];
  94
  95         if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
  96                 return;
  97
  98         int t = GNUNET_DISK_file_read(mycls.fh_from_helper, &buf, 65535);
  99         if (t<=0) {
 100                 fprintf(stderr, "Read error for header: %m\n");
 101                 GNUNET_SCHEDULER_add_now(mycls.sched, restart_helper, cls);
 102                 return;
 103         }
 104
 105         /* FIXME */ GNUNET_SERVER_mst_receive(mycls.mst, NULL, buf, t, 0, 0);
 106
 107         GNUNET_SCHEDULER_add_read_file (mycls.sched, GNUNET_TIME_UNIT_FOREVER_REL, mycls.fh_from_helper, &helper_read, NULL);
 108 }
 109
 110 static void message_token(void *cls, void *client, const struct GNUNET_MessageHeader *message) {
 111         if (ntohs(message->type) != GNUNET_MESSAGE_TYPE_VPN_HELPER) return;
 112
 113         struct tun_pkt *pkt_tun = (struct tun_pkt*) message;
 114
 115         fprintf(stderr, "Packet, Type: %x\n", ntohs(pkt_tun->tun.type));
 116
 117         if (ntohs(pkt_tun->tun.type) == 0x86dd) {
 118                 struct ip6_pkt *pkt6 = (struct ip6_pkt*) message;
 119                 struct ip6_tcp *pkt6_tcp;
 120                 struct ip6_udp *pkt6_udp;
 121
 122                 pkt_printf(pkt6);
 123                 switch(pkt6->ip6_hdr.nxthdr) {
 124                         case 0x06:
 125                                 pkt6_tcp = (struct ip6_tcp*)pkt6;
 126                                 pkt_printf_ip6tcp(pkt6_tcp);
 127                                 break;
 128                         case 0x11:
 129                                 pkt6_udp = (struct ip6_udp*)pkt6;
 130                                 pkt_printf_ip6udp(pkt6_udp);
 131                                 if (ntohs(pkt6_udp->udp_hdr.dpt) == 53) {
 132                                         pkt_printf_ip6dns((struct ip6_udp_dns*)pkt6_udp);
 133                                 }
 134                                 break;
 135                 }
 136         } else if (ntohs(pkt_tun->tun.type) == 0x0800) {
 137                 struct ip_pkt *pkt = (struct ip_pkt*) message;
 138                 struct ip_udp *udp = (struct ip_udp*) message;
 139                 fprintf(stderr, "IPv4\n");
 140                 if (pkt->ip_hdr.proto == 0x11 && ntohl(udp->ip_hdr.dadr) == 0x0a0a0a02 && ntohs(udp->udp_hdr.dpt) == 53 ) {
 141                         pkt_printf_ipdns((struct ip_udp_dns*)udp);
 142                 }
 143         }
 144
 145 }
 146
 147 /**
 148  * Main function that will be run by the scheduler.
 149  *
 150  * @param cls closure
 151  * @param sched the scheduler to use
 152  * @param args remaining command-line arguments
 153  * @param cfgfile name of the configuration file used (for saving, can be NULL!)
 154  * @param cfg configuration
 155  */
 156 static void
 157 run (void *cls,
 158      struct GNUNET_SCHEDULER_Handle *sched,
 159      char *const *args,
 160      const char *cfgfile,
 161      const struct GNUNET_CONFIGURATION_Handle *cfg)
 162 {
 163   mycls.sched = sched;
 164   mycls.mst = GNUNET_SERVER_mst_create(&message_token, NULL);
 165   GNUNET_SCHEDULER_add_delayed(sched, GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
 166   start_helper_and_schedule(mycls);
 167 }
 168
 169
 170 /**
 171  * The main function to obtain template from gnunetd.
 172  *
 173  * @param argc number of arguments from the command line
 174  * @param argv command line arguments
 175  * @return 0 ok, 1 on error
 176  */
 177 int
 178 main (int argc, char *const *argv)
 179 {
 180   static const struct GNUNET_GETOPT_CommandLineOption options[] = {
 181     GNUNET_GETOPT_OPTION_END
 182   };
 183
 184   return (GNUNET_OK ==
 185           GNUNET_PROGRAM_run (argc,
 186                               argv,
 187                               "gnunet-daemon-vpn",
 188                               gettext_noop ("help text"),
 189                               options, &run, NULL)) ? ret : 1;
 190 }
 191
 192 /* end of gnunet-daemon-vpn.c */