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) 2007-2012, 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 <stdlib.h>
  31 #include <sys/select.h>
  32 #include <sys/time.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <fcntl.h>
  36 #include <termios.h>
  37 #include <unistd.h>
  38 #include <signal.h>
  39 #include <errno.h>
  40 #include "i18n.h"
  41
  42 #include "barrygetopt.h"
  43
  44 using namespace std;
  45 using namespace Barry;
  46
  47 bool data_dump = false;
  48 volatile bool signal_end = false;
  49 int read_fd = -1;
  50 int write_fd = -1;
  51
  52 void Usage()
  53 {
  54    int logical, major, minor;
  55    const char *Version = Barry::Version(logical, major, minor);
  56
  57    cerr
  58    << "pppob - PPP over Barry\n"
  59    << "        Copyright 2007-2012, Net Direct Inc. (http://www.netdirect.ca/)\n"
  60    << "        Using: " << Version << "\n"
  61    << "\n"
  62    << "   -l file   Direct pppob log output to file (useful with -v)\n"
  63    << "   -p pin    PIN of device to talk with\n"
  64    << "             If only one device plugged in, this flag is optional\n"
  65    << "   -P pass   Simplistic method to specify device password\n"
  66    << "   -s        Use Serial mode instead of IpModem\n"
  67    << "   -t        Use a pseudo-tty instead of stdin/stdout\n"
  68    << "   -v        Dump protocol data during operation (debugging only!)\n"
  69    << endl;
  70 }
  71
  72 void signal_handler(int signum)
  73 {
  74         signal_end = true;
  75 }
  76
  77 void SerialDataCallback(void *context, const unsigned char *data, int len)
  78 {
  79         if( len && data_dump )
  80                 barryverbose("ReadThread:\n" << Data(data, len));
  81
  82         while( len ) {
  83                 int written = write(write_fd, data, len);
  84                 if( written > 0 ) {
  85                         len -= written;
  86                         data += written;
  87                 }
  88                 else {
  89                         barryverbose("Error in write()");
  90                 }
  91         }
  92 }
  93
  94 void ProcessStdin(Modem &modem)
  95 {
  96         // Read from stdin and write to USB, until
  97         // stdin is closed
  98         Data data;
  99         int bytes_read;
 100         fd_set rfds;
 101         struct timeval tv;
 102         int ret;
 103
 104         // Handle interrupt signals from pppd
 105         signal_end = false;
 106         signal(SIGINT, &signal_handler);
 107         signal(SIGHUP, &signal_handler);
 108         signal(SIGTERM, &signal_handler);
 109
 110         FD_ZERO(&rfds);
 111         while( signal_end == false ) {
 112                 // Need to use select() here, so that pppd doesn't
 113                 // hang when it tries to set the line discipline
 114                 // on our stdin.
 115
 116                 FD_SET(read_fd, &rfds);
 117                 tv.tv_sec = 30;
 118                 tv.tv_usec = 0;
 119
 120                 ret = select(read_fd+1, &rfds, NULL, NULL, &tv);
 121                 if( ret == -1 ) {
 122                         perror("select()");
 123                 }
 124                 else if( ret && FD_ISSET(read_fd, &rfds) ) {
 125                         bytes_read = read(read_fd, data.GetBuffer(), data.GetBufSize());
 126                         if( bytes_read == 0 )
 127                                 break;  // end of file
 128                         else if( bytes_read > 0 ) {
 129                                 data.ReleaseBuffer(bytes_read);
 130                                 modem.Write(data);
 131                         }
 132                         else {
 133                                 // read error
 134                                 barryverbose("Read error in ProcessStdin: " << strerror(errno));
 135                                 break;
 136                         }
 137                 }
 138         }
 139 }
 140
 141 int main(int argc, char *argv[])
 142 {
 143         INIT_I18N(PACKAGE);
 144
 145         cout.sync_with_stdio(true);     // leave this on, since libusb uses
 146                                         // stdio for debug messages
 147
 148         try {
 149
 150                 uint32_t pin = 0;
 151                 bool    force_serial = false,
 152                         pseudo_tty = false;
 153                 std::string logfile;
 154                 std::string password;
 155
 156                 // check for options via the fifo first, so the command
 157                 // line args can override them
 158                 FifoClient fifo;
 159                 if( fifo.Fetch(4) ) {
 160                         const FifoArgs &args = fifo.GetArgs();
 161                         pin = args.m_pin.Value();
 162                         force_serial = args.m_use_serial_mode;
 163                         logfile = args.m_log_filename;
 164                         password = args.m_password;
 165                         data_dump = args.m_verbose;
 166                 }
 167
 168                 // process command line options
 169                 for(;;) {
 170                         int cmd = getopt(argc, argv, "l:p:P:stv");
 171                         if( cmd == -1 )
 172                                 break;
 173
 174                         switch( cmd )
 175                         {
 176                         case 'l':       // Verbose log file
 177                                 logfile = optarg;
 178                                 break;
 179
 180                         case 'p':       // Blackberry PIN
 181                                 pin = strtoul(optarg, NULL, 16);
 182                                 break;
 183
 184                         case 'P':       // Device password
 185                                 password = optarg;
 186                                 break;
 187
 188                         case 's':       // Use Serial mode
 189                                 force_serial = true;
 190                                 break;
 191
 192                         case 't':       // Use pseudo-tty
 193                                 pseudo_tty = true;
 194                                 break;
 195
 196                         case 'v':       // data dump on
 197                                 data_dump = true;
 198                                 break;
 199
 200                         case 'h':       // help
 201                         default:
 202                                 Usage();
 203                                 return 0;
 204                         }
 205                 }
 206
 207                 if( pseudo_tty ) {
 208                         // open pty/tty master to get slave
 209                         int master = open("/dev/ptmx", O_RDWR);
 210                         if( master == -1 ) {
 211                                 cerr << "Cannot open /dev/ptmx: " << strerror(errno) << endl;
 212                                 return 1;
 213                         }
 214
 215                         // grant and unlock, as per pts(4) man page
 216                         if( grantpt(master) == -1 ) {
 217                                 cerr << "Warning: grantpt() failure: "
 218                                         << strerror(errno) << endl;
 219                         }
 220                         if( unlockpt(master) == -1 ) {
 221                                 cerr << "Warning: unlockpt() failure: "
 222                                         << strerror(errno) << endl;
 223                         }
 224
 225                         // set raw mode
 226                         struct termios tp;
 227                         tcgetattr(master, &tp);
 228                         cfmakeraw(&tp);
 229                         tcsetattr(master, TCSANOW, &tp);
 230
 231                         // send name of slave to stdout
 232                         cout << ptsname(master) << endl;
 233
 234                         // set the global fd's
 235                         read_fd = master;
 236                         write_fd = master;
 237                 }
 238                 else {
 239                         // just default to stdin/stdout
 240                         read_fd = 0;
 241                         write_fd = 1;
 242                 }
 243
 244                 // Initialize the barry library.  Must be called before
 245                 // anything else.
 246                 // Log to stderr, since stdout is for data in this program.
 247                 std::auto_ptr<std::ofstream> log;
 248                 if( logfile.size() ) {
 249                         log.reset( new std::ofstream(logfile.c_str(), ios::app) );
 250                         Barry::Init(data_dump, log.get());
 251                 }
 252                 else {
 253                         Barry::Init(data_dump, &std::cerr);
 254                 }
 255
 256                 // Display version if in data_dump mode
 257                 if( data_dump ) {
 258                         int logical, major, minor;
 259                         const char *Version = Barry::Version(logical, major, minor);
 260                         barryverbose(Version);
 261                 }
 262
 263                 // Probe the USB bus for Blackberry devices and display.
 264                 // If user has specified a PIN, search for it in the
 265                 // available device list here as well
 266                 Barry::Probe probe;
 267                 int activeDevice = probe.FindActive(pin);
 268                 if( activeDevice == -1 ) {
 269                         if( pin )
 270                                 cerr << "PIN " << setbase(16) << pin
 271                                         << " not found" << endl;
 272                         cerr << "No device selected" << endl;
 273                         return 1;
 274                 }
 275
 276                 const ProbeResult &device = probe.Get(activeDevice);
 277
 278                 if( !force_serial && device.HasIpModem() ) {
 279                         barryverbose("Using IpModem mode...");
 280
 281                         // Create our controller object using our threaded router.
 282                         Controller con(probe.Get(activeDevice));
 283
 284                         // Open serial mode... the callback handles reading from
 285                         // USB and writing to stdout
 286                         Mode::IpModem modem(con, SerialDataCallback, 0);
 287                         modem.Open(password.c_str());
 288
 289                         ProcessStdin(modem);
 290                         modem.Close();  // graceful close so we can restart without unplugging
 291                 }
 292                 else {
 293                         if( force_serial ) {
 294                                 barryverbose("Using Serial mode per command line...");
 295                         }
 296                         else {
 297                                 barryverbose("No IpModem mode available, using Serial mode...");
 298                         }
 299
 300                         // Create our socket router and start thread to handle
 301                         // the USB reading, instead of creating our own thread.
 302                         SocketRoutingQueue router;
 303                         router.SpinoffSimpleReadThread();
 304
 305                         // Create our controller object using our threaded router.
 306                         Controller con(probe.Get(activeDevice), router);
 307
 308                         // Open desktop mode... this handles the password side
 309                         // of things
 310                         Mode::Desktop desktop(con);
 311                         desktop.Open(password.c_str());
 312
 313                         // Open serial connection
 314                         Mode::Serial modem(con, SerialDataCallback, 0);
 315                         modem.Open(password.c_str());
 316
 317                         ProcessStdin(modem);
 318                 }
 319
 320                 barryverbose("Exiting");
 321
 322         }
 323         catch( std::exception &e ) {
 324                 cerr << "exception caught in main(): " << e.what() << endl;
 325                 return 1;
 326         }
 327
 328         return 0;
 329 }
 330