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 void cleanup(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
  55         struct vpn_cls* mycls = (struct vpn_cls*) cls;
  56         if (tskctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) {
  57                 PLIBC_KILL(mycls->helper_pid, SIGTERM);
  58                 GNUNET_OS_process_wait(mycls->helper_pid);
  59         }
  60 }
  61
  62 static void helper_read(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tsdkctx);
  63
  64 static void start_helper_and_schedule(struct vpn_cls* mycls) {
  65         mycls->helper_in = GNUNET_DISK_pipe(1);
  66         mycls->helper_out = GNUNET_DISK_pipe(1);
  67
  68         mycls->helper_pid = GNUNET_OS_start_process(mycls->helper_in, mycls->helper_out, "gnunet-helper-vpn", "gnunet-helper-vpn", NULL);
  69
  70         mycls->fh_from_helper = GNUNET_DISK_pipe_handle (mycls->helper_out, GNUNET_DISK_PIPE_END_READ);
  71
  72         GNUNET_DISK_pipe_close_end(mycls->helper_out, GNUNET_DISK_PIPE_END_WRITE);
  73         GNUNET_DISK_pipe_close_end(mycls->helper_in, GNUNET_DISK_PIPE_END_READ);
  74
  75         GNUNET_SCHEDULER_add_read_file (mycls->sched, GNUNET_TIME_UNIT_FOREVER_REL, mycls->fh_from_helper, &helper_read, mycls);
  76 }
  77
  78
  79 static void restart_helper(void* cls, const struct GNUNET_SCHEDULER_TaskContext* tskctx) {
  80         // FIXME: Ratelimit this!
  81         struct vpn_cls* mycls = (struct vpn_cls*) cls;
  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         struct vpn_cls* mycls = (struct vpn_cls*) cls;
  94         char buf[65535];
  95
  96         if (tsdkctx->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)
  97                 return;
  98
  99         int t = GNUNET_DISK_file_read(mycls->fh_from_helper, &buf, 65535);
 100         if (t<=0) {
 101                 fprintf(stderr, "Read error for header: %m\n");
 102                 GNUNET_SCHEDULER_add_now(mycls->sched, restart_helper, cls);
 103                 return;
 104         }
 105
 106         /* FIXME */ GNUNET_SERVER_mst_receive(mycls->mst, NULL, buf, t, 0, 0);
 107
 108         GNUNET_SCHEDULER_add_read_file (mycls->sched, GNUNET_TIME_UNIT_FOREVER_REL, mycls->fh_from_helper, &helper_read, mycls);
 109 }
 110
 111 static void message_token(void *cls, void *client, const struct GNUNET_MessageHeader *message) {
 112         if (ntohs(message->type) != GNUNET_MESSAGE_TYPE_VPN_HELPER) return;
 113
 114         struct tun_pkt *pkt_tun = (struct tun_pkt*) message;
 115
 116         fprintf(stderr, "Packet, Type: %x\n", ntohs(pkt_tun->tun.type));
 117
 118         if (ntohs(pkt_tun->tun.type) == 0x86dd) {
 119                 struct ip6_pkt *pkt6 = (struct ip6_pkt*) message;
 120                 struct ip6_tcp *pkt6_tcp;
 121                 struct ip6_udp *pkt6_udp;
 122
 123                 pkt_printf(pkt6);
 124                 switch(pkt6->ip6_hdr.nxthdr) {
 125                         case 0x06:
 126                                 pkt6_tcp = (struct ip6_tcp*)pkt6;
 127                                 pkt_printf_ip6tcp(pkt6_tcp);
 128                                 break;
 129                         case 0x11:
 130                                 pkt6_udp = (struct ip6_udp*)pkt6;
 131                                 pkt_printf_ip6udp(pkt6_udp);
 132                                 if (ntohs(pkt6_udp->udp_hdr.dpt) == 53) {
 133                                         pkt_printf_ip6dns((struct ip6_udp_dns*)pkt6_udp);
 134                                 }
 135                                 break;
 136                 }
 137         } else if (ntohs(pkt_tun->tun.type) == 0x0800) {
 138                 struct ip_pkt *pkt = (struct ip_pkt*) message;
 139                 struct ip_udp *udp = (struct ip_udp*) message;
 140                 fprintf(stderr, "IPv4\n");
 141                 if (pkt->ip_hdr.proto == 0x11 && ntohl(udp->ip_hdr.dadr) == 0x0a0a0a02 && ntohs(udp->udp_hdr.dpt) == 53 ) {
 142                         pkt_printf_ipdns((struct ip_udp_dns*)udp);
 143                 }
 144         }
 145
 146 }
 147
 148 /**
 149  * Main function that will be run by the scheduler.
 150  *
 151  * @param cls closure
 152  * @param sched the scheduler to use
 153  * @param args remaining command-line arguments
 154  * @param cfgfile name of the configuration file used (for saving, can be NULL!)
 155  * @param cfg configuration
 156  */
 157 static void
 158 run (void *cls,
 159                 struct GNUNET_SCHEDULER_Handle *sched,
 160                 char *const *args,
 161                 const char *cfgfile,
 162                 const struct GNUNET_CONFIGURATION_Handle *cfg) {
 163
 164         struct vpn_cls* mycls = (struct vpn_cls*) cls;
 165
 166         mycls->sched = sched;
 167
 168         mycls->mst = GNUNET_SERVER_mst_create(&message_token, mycls);
 169
 170         GNUNET_SCHEDULER_add_delayed(sched, GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
 171
 172         start_helper_and_schedule(mycls);
 173 }
 174
 175
 176 /**
 177  * The main function to obtain template from gnunetd.
 178  *
 179  * @param argc number of arguments from the command line
 180  * @param argv command line arguments
 181  * @return 0 ok, 1 on error
 182  */
 183 int
 184 main (int argc, char *const *argv)
 185 {
 186   static const struct GNUNET_GETOPT_CommandLineOption options[] = {
 187     GNUNET_GETOPT_OPTION_END
 188   };
 189
 190   struct vpn_cls* cls = GNUNET_malloc(sizeof(struct vpn_cls));
 191
 192   return (GNUNET_OK ==
 193           GNUNET_PROGRAM_run (argc,
 194                               argv,
 195                               "gnunet-daemon-vpn",
 196                               gettext_noop ("help text"),
 197                               options, &run, cls)) ? ret : 1;
 198
 199   GNUNET_free(cls); // Make clang happy
 200 }
 201
 202 /* end of gnunet-daemon-vpn.c */