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 /* #include "gnunet_template_service.h" */
  37
  38 /**
  39  * Final status code.
  40  */
  41 static int ret;
  42
  43 struct vpn_cls {
  44         struct GNUNET_DISK_PipeHandle* helper_in; // From the helper
  45         struct GNUNET_DISK_PipeHandle* helper_out; // To the helper
  46         const struct GNUNET_DISK_FileHandle* fh_from_helper;
  47
  48         struct GNUNET_SERVER_MessageStreamTokenizer* mst;
  49
  50         struct GNUNET_SCHEDULER_Handle *sched;
  51
  52         pid_t helper_pid;
  53 };
  54
  55 static void cleanup(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
  56         struct vpn_cls* mycls = (struct vpn_cls*) cls;
  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(struct vpn_cls* mycls) {
  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-vpn-helper", "gnunet-vpn-helper", 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, mycls);
  77 }
  78
  79
  80 static void restart_helper(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
  81         // FIXME: Ratelimit this!
  82         struct vpn_cls* mycls = (struct vpn_cls*) cls;
  83
  84         // Kill the helper
  85         PLIBC_KILL(mycls->helper_pid, SIGKILL);
  86         GNUNET_OS_process_wait(mycls->helper_pid);
  87
  88         // Restart the helper
  89         start_helper_and_schedule(mycls);
  90
  91 }
  92
  93 static void helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx) {
  94         struct vpn_cls* mycls = (struct vpn_cls*) cls;
  95         char buf[65535];
  96
  97         if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
  98                 return;
  99
 100         int t = GNUNET_DISK_file_read(mycls->fh_from_helper, &buf, 65535);
 101         if (t<=0) {
 102                 fprintf(stderr, "Read error for header: %m\n");
 103                 GNUNET_SCHEDULER_add_now(mycls->sched, restart_helper, cls);
 104                 return;
 105         }
 106
 107         /* FIXME */ GNUNET_SERVER_mst_receive(mycls->mst, NULL, buf, t, 0, 0);
 108
 109         GNUNET_SCHEDULER_add_read_file (mycls->sched, GNUNET_TIME_UNIT_FOREVER_REL, mycls->fh_from_helper, &helper_read, mycls);
 110 }
 111
 112 static void message_token(void *cls, void *client, const struct GNUNET_MessageHeader *message) {
 113         if (ntohs(message->type) != GNUNET_MESSAGE_TYPE_VPN_HELPER) return;
 114
 115         struct ip6_pkt *pkt6 = (struct ip6_pkt*) message;
 116         struct ip6_tcp *pkt6_tcp;
 117         struct ip6_udp *pkt6_udp;
 118
 119         pkt_printf(pkt6);
 120         switch(pkt6->ip6_hdr.nxthdr) {
 121                 case 0x06:
 122                         pkt6_tcp = (struct ip6_tcp*)pkt6;
 123                         pkt_printf_ip6tcp(pkt6_tcp);
 124                         break;
 125                 case 0x11:
 126                         pkt6_udp = (struct ip6_udp*)pkt6;
 127                         pkt_printf_ip6udp(pkt6_udp);
 128                         if (ntohs(pkt6_udp->udp_hdr.dpt) == 53) {
 129                                 pkt_printf_ip6dns((struct ip6_udp_dns*)pkt6_udp);
 130                         }
 131                         break;
 132         }
 133
 134 }
 135
 136 /**
 137  * Main function that will be run by the scheduler.
 138  *
 139  * @param cls closure
 140  * @param sched the scheduler to use
 141  * @param args remaining command-line arguments
 142  * @param cfgfile name of the configuration file used (for saving, can be NULL!)
 143  * @param cfg configuration
 144  */
 145 static void
 146 run (void *cls,
 147                 struct GNUNET_SCHEDULER_Handle *sched,
 148                 char *const *args,
 149                 const char *cfgfile,
 150                 const struct GNUNET_CONFIGURATION_Handle *cfg) {
 151
 152         struct vpn_cls* mycls = (struct vpn_cls*) cls;
 153
 154         mycls->sched = sched;
 155
 156         mycls->mst = GNUNET_SERVER_mst_create(&message_token, mycls);
 157
 158         GNUNET_SCHEDULER_add_delayed(sched, GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
 159
 160         start_helper_and_schedule(mycls);
 161 }
 162
 163
 164 /**
 165  * The main function to obtain template from gnunetd.
 166  *
 167  * @param argc number of arguments from the command line
 168  * @param argv command line arguments
 169  * @return 0 ok, 1 on error
 170  */
 171 int
 172 main (int argc, char *const *argv)
 173 {
 174   static const struct GNUNET_GETOPT_CommandLineOption options[] = {
 175     GNUNET_GETOPT_OPTION_END
 176   };
 177
 178   struct vpn_cls* cls = GNUNET_malloc(sizeof(struct vpn_cls));
 179
 180   return (GNUNET_OK ==
 181           GNUNET_PROGRAM_run (argc,
 182                               argv,
 183                               "gnunet-daemon-vpn",
 184                               gettext_noop ("help text"),
 185                               options, &run, cls)) ? ret : 1;
 186
 187   GNUNET_free(cls); // Make clang happy
 188 }
 189
 190 /* end of gnunet-daemon-vpn.c */