tools/pppob.cc

   1 ///
   2 /// \file       pppob.cc
   3 ///             In the same vein as pppoe, used with pppd to create a
   4 ///             pty tunnel and GPRS modem link.
   5 ///
   6
   7 /*
   8     Copyright (C) 2007-2008, Net Direct Inc. (http://www.netdirect.ca/)
   9
  10     This program is free software; you can redistribute it and/or modify
  11     it under the terms of the GNU General Public License as published by
  12     the Free Software Foundation; either version 2 of the License, or
  13     (at your option) any later version.
  14
  15     This program is distributed in the hope that it will be useful,
  16     but WITHOUT ANY WARRANTY; without even the implied warranty of
  17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  18
  19     See the GNU General Public License in the COPYING file at the
  20     root directory of this project for more details.
  21 */
  22
  23 #include <barry/barry.h>
  24 #include <iomanip>
  25 #include <iostream>
  26 #include <fstream>
  27 #include <vector>
  28 #include <string>
  29 #include <memory>
  30 #include <getopt.h>
  31 #include <sys/select.h>
  32 #include <sys/time.h>
  33 #include <sys/types.h>
  34 #include <unistd.h>
  35 #include <signal.h>
  36
  37
  38 using namespace std;
  39 using namespace Barry;
  40
  41 bool data_dump = false;
  42 volatile bool signal_end = false;
  43
  44 void Usage()
  45 {
  46    int major, minor;
  47    const char *Version = Barry::Version(major, minor);
  48
  49    cerr
  50    << "pppob - PPP over Barry\n"
  51    << "        Copyright 2007-2008, Net Direct Inc. (http://www.netdirect.ca/)\n"
  52    << "        Using: " << Version << "\n"
  53    << "\n"
  54    << "   -l file   Direct pppob log output to file (useful with -v)\n"
  55    << "   -p pin    PIN of device to talk with\n"
  56    << "             If only one device plugged in, this flag is optional\n"
  57    << "   -s        Use Serial mode instead of IpModem\n"
  58    << "   -v        Dump protocol data during operation (debugging only!)\n"
  59    << endl;
  60 }
  61
  62 void signal_handler(int signum)
  63 {
  64         signal_end = true;
  65 }
  66
  67 void SerialDataCallback(void *context, const unsigned char *data, int len)
  68 {
  69         if( len && data_dump )
  70                 barryverbose("ReadThread:\n" << Data(data, len));
  71
  72         while( len ) {
  73                 int written = write(1, data, len);
  74                 if( written > 0 ) {
  75                         len -= written;
  76                         data += written;
  77                 }
  78                 else {
  79                         barryverbose("Error in write()");
  80                 }
  81         }
  82 }
  83
  84 void ProcessStdin(Modem &modem)
  85 {
  86         // Read from stdin and write to USB, until
  87         // stdin is closed
  88         Data data;
  89         int bytes_read;
  90         fd_set rfds;
  91         struct timeval tv;
  92         int ret;
  93
  94         // Handle interrupt signals from pppd
  95         signal_end = false;
  96         signal(SIGINT, &signal_handler);
  97
  98         FD_ZERO(&rfds);
  99         while( signal_end == false ) {
 100                 // Need to use select() here, so that pppd doesn't
 101                 // hang when it tries to set the line discipline
 102                 // on our stdin.
 103
 104                 FD_SET(0, &rfds);
 105                 tv.tv_sec = 30;
 106                 tv.tv_usec = 0;
 107
 108                 ret = select(1, &rfds, NULL, NULL, &tv);
 109                 if( ret == -1 ) {
 110                         perror("select()");
 111                 }
 112                 else if( ret && FD_ISSET(0, &rfds) ) {
 113                         bytes_read = read(0, data.GetBuffer(), data.GetBufSize());
 114                         if( bytes_read == 0 )
 115                                 break;
 116
 117                         if( bytes_read > 0 ) {
 118                                 data.ReleaseBuffer(bytes_read);
 119                                 modem.Write(data);
 120                         }
 121                 }
 122         }
 123 }
 124
 125 int main(int argc, char *argv[])
 126 {
 127         cout.sync_with_stdio(true);     // leave this on, since libusb uses
 128                                         // stdio for debug messages
 129
 130         try {
 131
 132                 uint32_t pin = 0;
 133                 bool force_serial = false;
 134                 std::string logfile;
 135
 136                 // process command line options
 137                 for(;;) {
 138                         int cmd = getopt(argc, argv, "l:p:sv");
 139                         if( cmd == -1 )
 140                                 break;
 141
 142                         switch( cmd )
 143                         {
 144                         case 'l':       // Verbose log file
 145                                 logfile = optarg;
 146                                 break;
 147
 148                         case 'p':       // Blackberry PIN
 149                                 pin = strtoul(optarg, NULL, 16);
 150                                 break;
 151
 152                         case 's':       // Use Serial mode
 153                                 force_serial = true;
 154                                 break;
 155
 156                         case 'v':       // data dump on
 157                                 data_dump = true;
 158                                 break;
 159
 160                         case 'h':       // help
 161                         default:
 162                                 Usage();
 163                                 return 0;
 164                         }
 165                 }
 166
 167                 // Initialize the barry library.  Must be called before
 168                 // anything else.
 169                 // Log to stderr, since stdout is for data in this program.
 170                 std::auto_ptr<std::ofstream> log;
 171                 if( logfile.size() ) {
 172                         log.reset( new std::ofstream(logfile.c_str(), ios::app) );
 173                         Barry::Init(data_dump, log.get());
 174                 }
 175                 else {
 176                         Barry::Init(data_dump, &std::cerr);
 177                 }
 178
 179                 // Probe the USB bus for Blackberry devices and display.
 180                 // If user has specified a PIN, search for it in the
 181                 // available device list here as well
 182                 Barry::Probe probe;
 183                 int activeDevice = probe.FindActive(pin);
 184                 if( activeDevice == -1 ) {
 185                         if( pin )
 186                                 cerr << "PIN " << setbase(16) << pin
 187                                         << " not found" << endl;
 188                         cerr << "No device selected" << endl;
 189                         return 1;
 190                 }
 191
 192                 const ProbeResult &device = probe.Get(activeDevice);
 193
 194                 if( !force_serial && device.HasIpModem() ) {
 195                         barryverbose("Using IpModem mode...");
 196
 197                         // Create our controller object using our threaded router.
 198                         Controller con(probe.Get(activeDevice));
 199
 200                         // Open serial mode... the callback handles reading from
 201                         // USB and writing to stdout
 202                         Mode::IpModem modem(con, SerialDataCallback, 0);
 203                         modem.Open();
 204
 205                         ProcessStdin(modem);
 206                 }
 207                 else {
 208                         barryverbose("Using Serial mode...");
 209
 210                         // Create our socket router and start thread to handle
 211                         // the USB reading, instead of creating our own thread.
 212                         SocketRoutingQueue router;
 213                         router.SpinoffSimpleReadThread();
 214
 215                         // Create our controller object using our threaded router.
 216                         Controller con(probe.Get(activeDevice), router);
 217
 218                         // Open desktop mode... this handles the password side
 219                         // of things
 220                         Mode::Desktop desktop(con);
 221                         desktop.Open(); // FIXME - support password here?
 222
 223                         // Open serial connection
 224                         Mode::Serial modem(con, SerialDataCallback, 0);
 225                         modem.Open();
 226
 227                         ProcessStdin(modem);
 228                 }
 229
 230
 231                 barryverbose("Exiting");
 232
 233         }
 234         catch( std::exception &e ) {
 235                 cerr << "exception caught in main(): " << e.what() << endl;
 236                 return 1;
 237         }
 238
 239         return 0;
 240 }
 241