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    << "   -P pass   Simplistic method to specify device password\n"
  58    << "   -s        Use Serial mode instead of IpModem\n"
  59    << "   -v        Dump protocol data during operation (debugging only!)\n"
  60    << endl;
  61 }
  62
  63 void signal_handler(int signum)
  64 {
  65         signal_end = true;
  66 }
  67
  68 void SerialDataCallback(void *context, const unsigned char *data, int len)
  69 {
  70         if( len && data_dump )
  71                 barryverbose("ReadThread:\n" << Data(data, len));
  72
  73         while( len ) {
  74                 int written = write(1, data, len);
  75                 if( written > 0 ) {
  76                         len -= written;
  77                         data += written;
  78                 }
  79                 else {
  80                         barryverbose("Error in write()");
  81                 }
  82         }
  83 }
  84
  85 void ProcessStdin(Modem &modem)
  86 {
  87         // Read from stdin and write to USB, until
  88         // stdin is closed
  89         Data data;
  90         int bytes_read;
  91         fd_set rfds;
  92         struct timeval tv;
  93         int ret;
  94
  95         // Handle interrupt signals from pppd
  96         signal_end = false;
  97         signal(SIGINT, &signal_handler);
  98         signal(SIGHUP, &signal_handler);
  99         signal(SIGTERM, &signal_handler);
 100
 101         FD_ZERO(&rfds);
 102         while( signal_end == false ) {
 103                 // Need to use select() here, so that pppd doesn't
 104                 // hang when it tries to set the line discipline
 105                 // on our stdin.
 106
 107                 FD_SET(0, &rfds);
 108                 tv.tv_sec = 30;
 109                 tv.tv_usec = 0;
 110
 111                 ret = select(1, &rfds, NULL, NULL, &tv);
 112                 if( ret == -1 ) {
 113                         perror("select()");
 114                 }
 115                 else if( ret && FD_ISSET(0, &rfds) ) {
 116                         bytes_read = read(0, data.GetBuffer(), data.GetBufSize());
 117                         if( bytes_read == 0 )
 118                                 break;
 119
 120                         if( bytes_read > 0 ) {
 121                                 data.ReleaseBuffer(bytes_read);
 122                                 modem.Write(data);
 123                         }
 124                 }
 125         }
 126 }
 127
 128 int main(int argc, char *argv[])
 129 {
 130         cout.sync_with_stdio(true);     // leave this on, since libusb uses
 131                                         // stdio for debug messages
 132
 133         try {
 134
 135                 uint32_t pin = 0;
 136                 bool force_serial = false;
 137                 std::string logfile;
 138                 std::string password;
 139
 140                 // process command line options
 141                 for(;;) {
 142                         int cmd = getopt(argc, argv, "l:p:P:sv");
 143                         if( cmd == -1 )
 144                                 break;
 145
 146                         switch( cmd )
 147                         {
 148                         case 'l':       // Verbose log file
 149                                 logfile = optarg;
 150                                 break;
 151
 152                         case 'p':       // Blackberry PIN
 153                                 pin = strtoul(optarg, NULL, 16);
 154                                 break;
 155
 156                         case 'P':       // Device password
 157                                 password = optarg;
 158                                 break;
 159
 160                         case 's':       // Use Serial mode
 161                                 force_serial = true;
 162                                 break;
 163
 164                         case 'v':       // data dump on
 165                                 data_dump = true;
 166                                 break;
 167
 168                         case 'h':       // help
 169                         default:
 170                                 Usage();
 171                                 return 0;
 172                         }
 173                 }
 174
 175                 // Initialize the barry library.  Must be called before
 176                 // anything else.
 177                 // Log to stderr, since stdout is for data in this program.
 178                 std::auto_ptr<std::ofstream> log;
 179                 if( logfile.size() ) {
 180                         log.reset( new std::ofstream(logfile.c_str(), ios::app) );
 181                         Barry::Init(data_dump, log.get());
 182                 }
 183                 else {
 184                         Barry::Init(data_dump, &std::cerr);
 185                 }
 186
 187                 // Probe the USB bus for Blackberry devices and display.
 188                 // If user has specified a PIN, search for it in the
 189                 // available device list here as well
 190                 Barry::Probe probe;
 191                 int activeDevice = probe.FindActive(pin);
 192                 if( activeDevice == -1 ) {
 193                         if( pin )
 194                                 cerr << "PIN " << setbase(16) << pin
 195                                         << " not found" << endl;
 196                         cerr << "No device selected" << endl;
 197                         return 1;
 198                 }
 199
 200                 const ProbeResult &device = probe.Get(activeDevice);
 201
 202                 if( !force_serial && device.HasIpModem() ) {
 203                         barryverbose("Using IpModem mode...");
 204
 205                         // Create our controller object using our threaded router.
 206                         Controller con(probe.Get(activeDevice));
 207
 208                         // Open serial mode... the callback handles reading from
 209                         // USB and writing to stdout
 210                         Mode::IpModem modem(con, SerialDataCallback, 0);
 211                         modem.Open(password.c_str());
 212
 213                         ProcessStdin(modem);
 214                         modem.Close();  // graceful close so we can restart without unplugging
 215                 }
 216                 else {
 217                         barryverbose("Using Serial mode...");
 218
 219                         // Create our socket router and start thread to handle
 220                         // the USB reading, instead of creating our own thread.
 221                         SocketRoutingQueue router;
 222                         router.SpinoffSimpleReadThread();
 223
 224                         // Create our controller object using our threaded router.
 225                         Controller con(probe.Get(activeDevice), router);
 226
 227                         // Open desktop mode... this handles the password side
 228                         // of things
 229                         Mode::Desktop desktop(con);
 230                         desktop.Open(password.c_str());
 231
 232                         // Open serial connection
 233                         Mode::Serial modem(con, SerialDataCallback, 0);
 234                         modem.Open();
 235
 236                         ProcessStdin(modem);
 237                 }
 238
 239                 barryverbose("Exiting");
 240
 241         }
 242         catch( std::exception &e ) {
 243                 cerr << "exception caught in main(): " << e.what() << endl;
 244                 return 1;
 245         }
 246
 247         return 0;
 248 }
 249