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) 2007-2013, 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 << string_vprintf(
  58    _("pppob - PPP over Barry\n"
  59    "        Copyright 2007-2013, Net Direct Inc. (http://www.netdirect.ca/)\n"
  60    "        Using: %s\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         Version)
  70    << endl;
  71 }
  72
  73 void signal_handler(int signum)
  74 {
  75         signal_end = true;
  76 }
  77
  78 void SerialDataCallback(void *context, const unsigned char *data, int len)
  79 {
  80         if( len && data_dump )
  81                 barryverbose("ReadThread:\n" << Data(data, len));
  82
  83         while( len ) {
  84                 int written = write(write_fd, data, len);
  85                 if( written > 0 ) {
  86                         len -= written;
  87                         data += written;
  88                 }
  89                 else {
  90                         barryverbose(_("Error in write()"));
  91                 }
  92         }
  93 }
  94
  95 void ProcessStdin(Modem &modem)
  96 {
  97         // Read from stdin and write to USB, until
  98         // stdin is closed
  99         Data data;
 100         int bytes_read;
 101         fd_set rfds;
 102         struct timeval tv;
 103         int ret;
 104
 105         // Handle interrupt signals from pppd
 106         signal_end = false;
 107         signal(SIGINT, &signal_handler);
 108         signal(SIGHUP, &signal_handler);
 109         signal(SIGTERM, &signal_handler);
 110
 111         FD_ZERO(&rfds);
 112         while( signal_end == false ) {
 113                 // Need to use select() here, so that pppd doesn't
 114                 // hang when it tries to set the line discipline
 115                 // on our stdin.
 116
 117                 FD_SET(read_fd, &rfds);
 118                 tv.tv_sec = 30;
 119                 tv.tv_usec = 0;
 120
 121                 ret = select(read_fd+1, &rfds, NULL, NULL, &tv);
 122                 if( ret == -1 ) {
 123                         perror("select()");
 124                 }
 125                 else if( ret && FD_ISSET(read_fd, &rfds) ) {
 126                         bytes_read = read(read_fd, data.GetBuffer(), data.GetBufSize());
 127                         if( bytes_read == 0 )
 128                                 break;  // end of file
 129                         else if( bytes_read > 0 ) {
 130                                 data.ReleaseBuffer(bytes_read);
 131                                 modem.Write(data);
 132                         }
 133                         else {
 134                                 // read error
 135                                 barryverbose(_("Read error in ProcessStdin: ") << strerror(errno));
 136                                 break;
 137                         }
 138                 }
 139         }
 140 }
 141
 142 int main(int argc, char *argv[])
 143 {
 144         INIT_I18N(PACKAGE);
 145
 146         cout.sync_with_stdio(true);     // leave this on, since libusb uses
 147                                         // stdio for debug messages
 148
 149         try {
 150
 151                 uint32_t pin = 0;
 152                 bool    force_serial = false,
 153                         pseudo_tty = false;
 154                 std::string logfile;
 155                 std::string password;
 156
 157                 // check for options via the fifo first, so the command
 158                 // line args can override them
 159                 FifoClient fifo;
 160                 if( fifo.Fetch(4) ) {
 161                         const FifoArgs &args = fifo.GetArgs();
 162                         pin = args.m_pin.Value();
 163                         force_serial = args.m_use_serial_mode;
 164                         logfile = args.m_log_filename;
 165                         password = args.m_password;
 166                         data_dump = args.m_verbose;
 167                 }
 168
 169                 // process command line options
 170                 for(;;) {
 171                         int cmd = getopt(argc, argv, "l:p:P:stv");
 172                         if( cmd == -1 )
 173                                 break;
 174
 175                         switch( cmd )
 176                         {
 177                         case 'l':       // Verbose log file
 178                                 logfile = optarg;
 179                                 break;
 180
 181                         case 'p':       // Blackberry PIN
 182                                 pin = strtoul(optarg, NULL, 16);
 183                                 break;
 184
 185                         case 'P':       // Device password
 186                                 password = optarg;
 187                                 break;
 188
 189                         case 's':       // Use Serial mode
 190                                 force_serial = true;
 191                                 break;
 192
 193                         case 't':       // Use pseudo-tty
 194                                 pseudo_tty = true;
 195                                 break;
 196
 197                         case 'v':       // data dump on
 198                                 data_dump = true;
 199                                 break;
 200
 201                         case 'h':       // help
 202                         default:
 203                                 Usage();
 204                                 return 0;
 205                         }
 206                 }
 207
 208                 if( pseudo_tty ) {
 209                         // open pty/tty master to get slave
 210                         int master = open("/dev/ptmx", O_RDWR);
 211                         if( master == -1 ) {
 212                                 cerr << _("Cannot open /dev/ptmx: ") << strerror(errno) << endl;
 213                                 return 1;
 214                         }
 215
 216                         // grant and unlock, as per pts(4) man page
 217                         if( grantpt(master) == -1 ) {
 218                                 cerr << _("Warning: grantpt() failure: ")
 219                                         << strerror(errno) << endl;
 220                         }
 221                         if( unlockpt(master) == -1 ) {
 222                                 cerr << _("Warning: unlockpt() failure: ")
 223                                         << strerror(errno) << endl;
 224                         }
 225
 226                         // set raw mode
 227                         struct termios tp;
 228                         tcgetattr(master, &tp);
 229                         cfmakeraw(&tp);
 230                         tcsetattr(master, TCSANOW, &tp);
 231
 232                         // send name of slave to stdout
 233                         cout << ptsname(master) << endl;
 234
 235                         // set the global fd's
 236                         read_fd = master;
 237                         write_fd = master;
 238                 }
 239                 else {
 240                         // just default to stdin/stdout
 241                         read_fd = 0;
 242                         write_fd = 1;
 243                 }
 244
 245                 // Initialize the barry library.  Must be called before
 246                 // anything else.
 247                 // Log to stderr, since stdout is for data in this program.
 248                 std::auto_ptr<std::ofstream> log;
 249                 if( logfile.size() ) {
 250                         log.reset( new std::ofstream(logfile.c_str(), ios::app) );
 251                         Barry::Init(data_dump, log.get());
 252                 }
 253                 else {
 254                         Barry::Init(data_dump, &std::cerr);
 255                 }
 256
 257                 // Display version if in data_dump mode
 258                 if( data_dump ) {
 259                         int logical, major, minor;
 260                         const char *Version = Barry::Version(logical, major, minor);
 261                         barryverbose(Version);
 262                 }
 263
 264                 // Probe the USB bus for Blackberry devices and display.
 265                 // If user has specified a PIN, search for it in the
 266                 // available device list here as well
 267                 Barry::Probe probe;
 268                 int activeDevice = probe.FindActive(pin);
 269                 if( activeDevice == -1 ) {
 270                         if( pin )
 271                                 cerr << _("PIN not found: ")
 272                                         << setbase(16) << pin << endl;
 273                         cerr << _("No device selected") << endl;
 274                         return 1;
 275                 }
 276
 277                 const ProbeResult &device = probe.Get(activeDevice);
 278
 279                 if( !force_serial && device.HasIpModem() ) {
 280                         barryverbose(_("Using IpModem mode..."));
 281
 282                         // Create our controller object using our threaded router.
 283                         Controller con(probe.Get(activeDevice));
 284
 285                         // Open serial mode... the callback handles reading from
 286                         // USB and writing to stdout
 287                         Mode::IpModem modem(con, SerialDataCallback, 0);
 288                         modem.Open(password.c_str());
 289
 290                         ProcessStdin(modem);
 291                         modem.Close();  // graceful close so we can restart without unplugging
 292                 }
 293                 else {
 294                         if( force_serial ) {
 295                                 barryverbose(_("Using Serial mode per command line..."));
 296                         }
 297                         else {
 298                                 barryverbose(_("No IpModem mode available, using Serial mode..."));
 299                         }
 300
 301                         // Create our socket router and start thread to handle
 302                         // the USB reading, instead of creating our own thread.
 303                         SocketRoutingQueue router;
 304                         router.SpinoffSimpleReadThread();
 305
 306                         // Create our controller object using our threaded router.
 307                         Controller con(probe.Get(activeDevice), router);
 308
 309                         // Open desktop mode... this handles the password side
 310                         // of things
 311                         Mode::Desktop desktop(con);
 312                         desktop.Open(password.c_str());
 313
 314                         // Open serial connection
 315                         Mode::Serial modem(con, SerialDataCallback, 0);
 316                         modem.Open(password.c_str());
 317
 318                         ProcessStdin(modem);
 319                 }
 320
 321                 barryverbose(_("Exiting"));
 322
 323         }
 324         catch( std::exception &e ) {
 325                 cerr << _("exception caught in main(): ") << e.what() << endl;
 326                 return 1;
 327         }
 328
 329         return 0;
 330 }
 331