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pppob.cc

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///
/// \file   pppob.cc
///         In the same vein as pppoe, used with pppd to create a
///         pty tunnel and GPRS modem link.
///

/*
    Copyright (C) 2007-2008, Net Direct Inc. (http://www.netdirect.ca/)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

    See the GNU General Public License in the COPYING file at the
    root directory of this project for more details.
*/

#include <barry/barry.h>
#include <iomanip>
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <memory>
#include <getopt.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>


using namespace std;
using namespace Barry;

bool data_dump = false;
volatile bool signal_end = false;

void Usage()
{
   int major, minor;
   const char *Version = Barry::Version(major, minor);

   cerr
   << "pppob - PPP over Barry\n"
   << "        Copyright 2007-2008, Net Direct Inc. (http://www.netdirect.ca/)\n"
   << "        Using: " << Version << "\n"
   << "\n"
   << "   -l file   Direct pppob log output to file (useful with -v)\n"
   << "   -p pin    PIN of device to talk with\n"
   << "             If only one device plugged in, this flag is optional\n"
   << "   -P pass   Simplistic method to specify device password\n"
   << "   -s        Use Serial mode instead of IpModem\n"
   << "   -v        Dump protocol data during operation (debugging only!)\n"
   << endl;
}

void signal_handler(int signum)
{
      signal_end = true;
}

void SerialDataCallback(void *context, const unsigned char *data, int len)
{
      if( len && data_dump )
            barryverbose("ReadThread:\n" << Data(data, len));

      while( len ) {
            int written = write(1, data, len);
            if( written > 0 ) {
                  len -= written;
                  data += written;
            }
            else {
                  barryverbose("Error in write()");
            }
      }
}

void ProcessStdin(Modem &modem)
{
      // Read from stdin and write to USB, until
      // stdin is closed
      Data data;
      int bytes_read;
      fd_set rfds;
      struct timeval tv;
      int ret;

      // Handle interrupt signals from pppd
      signal_end = false;
      signal(SIGINT, &signal_handler);
      signal(SIGHUP, &signal_handler);
      signal(SIGTERM, &signal_handler);

      FD_ZERO(&rfds);
      while( signal_end == false ) {
            // Need to use select() here, so that pppd doesn't
            // hang when it tries to set the line discipline
            // on our stdin.

            FD_SET(0, &rfds);
            tv.tv_sec = 30;
            tv.tv_usec = 0;

            ret = select(1, &rfds, NULL, NULL, &tv);
            if( ret == -1 ) {
                  perror("select()");
            }
            else if( ret && FD_ISSET(0, &rfds) ) {
                  bytes_read = read(0, data.GetBuffer(), data.GetBufSize());
                  if( bytes_read == 0 )
                        break;

                  if( bytes_read > 0 ) {
                        data.ReleaseBuffer(bytes_read);
                        modem.Write(data);
                  }
            }
      }
}

int main(int argc, char *argv[])
{
      cout.sync_with_stdio(true);   // leave this on, since libusb uses
                              // stdio for debug messages

      try {

            uint32_t pin = 0;
            bool force_serial = false;
            std::string logfile;
            std::string password;

            // process command line options
            for(;;) {
                  int cmd = getopt(argc, argv, "l:p:P:sv");
                  if( cmd == -1 )
                        break;

                  switch( cmd )
                  {
                  case 'l':   // Verbose log file
                        logfile = optarg;
                        break;

                  case 'p':   // Blackberry PIN
                        pin = strtoul(optarg, NULL, 16);
                        break;

                  case 'P':   // Device password
                        password = optarg;
                        break;

                  case 's':   // Use Serial mode
                        force_serial = true;
                        break;

                  case 'v':   // data dump on
                        data_dump = true;
                        break;

                  case 'h':   // help
                  default:
                        Usage();
                        return 0;
                  }
            }

            // Initialize the barry library.  Must be called before
            // anything else.
            // Log to stderr, since stdout is for data in this program.
            std::auto_ptr<std::ofstream> log;
            if( logfile.size() ) {
                  log.reset( new std::ofstream(logfile.c_str(), ios::app) );
                  Barry::Init(data_dump, log.get());
            }
            else {
                  Barry::Init(data_dump, &std::cerr);
            }

            // Probe the USB bus for Blackberry devices and display.
            // If user has specified a PIN, search for it in the
            // available device list here as well
            Barry::Probe probe;
            int activeDevice = probe.FindActive(pin);
            if( activeDevice == -1 ) {
                  if( pin )
                        cerr << "PIN " << setbase(16) << pin
                              << " not found" << endl;
                  cerr << "No device selected" << endl;
                  return 1;
            }

            const ProbeResult &device = probe.Get(activeDevice);

            if( !force_serial && device.HasIpModem() ) {
                  barryverbose("Using IpModem mode...");

                  // Create our controller object using our threaded router.
                  Controller con(probe.Get(activeDevice));

                  // Open serial mode... the callback handles reading from
                  // USB and writing to stdout
                  Mode::IpModem modem(con, SerialDataCallback, 0);
                  modem.Open(password.c_str());

                  ProcessStdin(modem);
                  modem.Close();    // graceful close so we can restart without unplugging
            }
            else {
                  barryverbose("Using Serial mode...");

                  // Create our socket router and start thread to handle
                  // the USB reading, instead of creating our own thread.
                  SocketRoutingQueue router;
                  router.SpinoffSimpleReadThread();

                  // Create our controller object using our threaded router.
                  Controller con(probe.Get(activeDevice), router);

                  // Open desktop mode... this handles the password side
                  // of things
                  Mode::Desktop desktop(con);
                  desktop.Open(password.c_str());

                  // Open serial connection
                  Mode::Serial modem(con, SerialDataCallback, 0);
                  modem.Open();

                  ProcessStdin(modem);
            }

            barryverbose("Exiting");

      }
      catch( std::exception &e ) {
            cerr << "exception caught in main(): " << e.what() << endl;
            return 1;
      }

      return 0;
}


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