File: main.cpp

package info (click to toggle)
kppp 4:17.08.3-1
  • links: PTS, VCS
  • area: main
  • in suites: buster, sid
  • size: 4,176 kB
  • sloc: cpp: 13,825; tcl: 49; sh: 19; xml: 15; makefile: 5
file content (449 lines) | stat: -rw-r--r-- 11,614 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
/*
 *            kPPP: A pppd front end for the KDE project
 *
 *            Copyright (C) 1997 Bernd Johannes Wuebben
 *                   wuebben@math.cornell.edu
 *            Copyright (C) 1998-2002 Harri Porten <porten@kde.org>
 *
 * based on EzPPP:
 * Copyright (C) 1997  Jay Painter
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this program; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include <config-kppp.h>

#include "main.h"

#include <unistd.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <locale.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>

#ifdef _XPG4_2
#define __xnet_connect	connect
#endif

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif

#include <kaboutdata.h>
#include <kapplication.h>
#include <kcmdlineargs.h>
#include <kdebug.h>
#include <kglobal.h>
#include <klocale.h>
#include <kmessagebox.h>
#include <kstandarddirs.h>

#include "kpppwidget.h"
#include "opener.h"
#include "pppdata.h"
#include "providerdb.h"
#include "version.h"
#include "requester.h"

//#include <X11/Xlib.h>
//Added by qt3to4:
#include <QEvent>

static const char description[] =
	I18N_NOOP("A dialer and front-end to pppd");


KPPPWidget*	p_kppp;

// for testing purposes
bool TESTING=0;

// initial effective user id before possible suid status is dropped
uid_t euid;
// helper process' pid
pid_t helperPid = -1;

QString local_ip_address;
QString remote_ip_address;
QString pidfile;

#if 0
extern "C" {
  static int kppp_x_errhandler( Display *dpy, XErrorEvent *err ) {
    char errstr[256]; // safe

    /*
      if(gpppdata.pppdpid() >= 0) {
      kill(gpppdata.pppdpid(), SIGTERM);
      }

      p_kppp->stopAccounting();
      removedns();
      unlockdevice();*/

    XGetErrorText( dpy, err->error_code, errstr, 256 );
    kFatal() << "X Error: " << errstr;
    kFatal() << "Major opcode: " << err->request_code;
    exit(256);
    return 0;
  }


  static int kppp_xio_errhandler( Display * ) {
    if(gpppdata.get_xserver_exit_disconnect()) {
      fprintf(stderr, "X11 Error!\n");
      if(gpppdata.pppdRunning())
        Requester::rq->killPPPDaemon();

      p_kppp->stopAccounting();
      removedns();
      Modem::modem->unlockdevice();
      return 0;
    } else{
      kFatal() << "Fatal IO error: client killed";
      exit(256);
      return 0;
    }
  }
} /* extern "C" */
#endif

int main( int argc, char **argv ) {
  // make sure that open/fopen and so on NEVER return 1 or 2 (stdout and stderr)
  // Expl: if stdout/stderr were closed on program start (by parent), open()
  // would return a FD of 1, 2 (or even 0 if stdin was closed too)
  if(fcntl(0, F_GETFL) == -1)
    (void)open("/dev/null", O_RDONLY);

  if(fcntl(1, F_GETFL) == -1)
    (void)open("/dev/null", O_WRONLY);

  if(fcntl(2, F_GETFL) == -1)
    (void)open("/dev/null", O_WRONLY);

  // Don't insert anything above this line unless you really know what
  // you're doing. We're most likely running setuid root here,
  // until we drop this status a few lines below.
  int sockets[2];
  if(socketpair(AF_UNIX, SOCK_DGRAM, 0, sockets) != 0) {
    fprintf(stderr, "error creating socketpair !\n");
    return 1;
  }

  switch(helperPid = fork()) {
  case 0:
    // child process
    // make process leader of new group
    setsid();
    umask(0);
    close(sockets[0]);
    signal(SIGHUP, SIG_IGN);
    (void) new Opener(sockets[1]);
    // we should never get here
    _exit(1);

  case -1:
    perror("fork() failed");
    exit(1);
  }

  // parent process
  close(sockets[1]);

  // drop setuid status
  euid = geteuid();
  if (setgid(getgid()) < 0 && errno != EPERM) {
    perror("setgid() failed");
    exit(1);
  }
  setuid(getuid());
  if (geteuid() != getuid()) {
    perror("setuid() failed");
    exit(1);
  }

  //
  // end of setuid-dropping block.
  //

  // install exit handler that will kill the helper process
  atexit(myShutDown);

  // not needed anymore, just causes problems with broken setup
  //  if(getHomeDir() != 0)
  //      setenv("HOME", getHomeDir(), 1);

  (void) new Requester(sockets[0]);

  KAboutData aboutData("kppp", 0, ki18n("KPPP"),
    KPPPVERSION, ki18n(description), KAboutData::License_GPL,
    ki18n("(c) 1999-2002, The KPPP Developers"));
  aboutData.addAuthor(ki18n("Harri Porten"), ki18n("Current maintainer"), "porten@kde.org");
  aboutData.addAuthor(ki18n("Bernd Wuebben"), ki18n("Original author"), "wuebben@kde.org");
  aboutData.addAuthor(ki18n("Mario Weilguni"));

  KCmdLineArgs::init( argc, argv, &aboutData );

  KCmdLineOptions options;
  options.add("c <account_name>", ki18n("Connect using 'account_name'"));
  options.add("m <modem_name>", ki18n("Connect using 'modem_name'"));
  options.add("k", ki18n("Terminate an existing connection"));
  options.add("q", ki18n("Quit after end of connection"));
  options.add("r <rule_file>", ki18n("Check syntax of rule_file"));
  options.add("T", ki18n("Enable test-mode"));
  options.add("dev <device_name>", ki18n("Use the specified device"));
  KCmdLineArgs::addCmdLineOptions( options );



  KApplication a;

  // set portable locale for decimal point
  setlocale(LC_NUMERIC ,"C");

  // open configuration file
  gpppdata.open();

  kDebug(5002) << "helperPid: " << (int) helperPid;

  KCmdLineArgs *args = KCmdLineArgs::parsedArgs();

  bool terminate_connection = args->isSet("k");
  if (args->isSet("r"))
    return RuleSet::checkRuleFile(args->getOption("r"));

  TESTING = args->isSet("T");

  // make sure that nobody can read the password from the
  // config file
  QString configFile = KGlobal::dirs()->saveLocation("config")
    + kapp->objectName() + "rc";
  if(access(QFile::encodeName(configFile), F_OK) == 0)
    chmod(QFile::encodeName(configFile), S_IRUSR | S_IWUSR);

  // do we really need to generate an empty directory structure here ?
  KGlobal::dirs()->saveLocation("appdata", "Rules");

  int pid = create_pidfile();
  QString err_msg = i18n("kppp can not create or read from\n%1.", pidfile);

  if(pid < 0) {
    KMessageBox::error(0L, err_msg);
    return 1;
  }

  if (terminate_connection) {
    setgid(getgid());
    setuid(getuid());
    if (pid > 0)
      kill(pid, SIGINT);
    else
      remove_pidfile();
    return 0;
  }

  // Mario: testing
  if(TESTING) {
    gpppdata.open();
    gpppdata.setAccountByIndex(0);

    QString s = argv[2];
    urlEncode(s);
    kDebug(5002) << s;

    remove_pidfile();
    return 0;
  }

  if (pid > 0) {
    QString msg = i18n("kppp has detected a %1 file.\n"
                       "Another instance of kppp seems to be "
                       "running under process-ID %2.\n"
                       "Please click Exit, make sure that you are "
                       "not running another kppp, delete the pid "
                       "file, and restart kppp.\n"
                       "Alternatively, if you have determined that "
                       "there is no other kppp running, please "
                       "click Continue to begin.",
                   pidfile, pid);
    int button = KMessageBox::warningYesNo(0, msg, i18n("Error"),
                                      KGuiItem(i18n("Exit")), KStandardGuiItem::cont());
    if (button == KMessageBox::Yes)            /* exit */
       return 1;

    remove_pidfile();
    pid = create_pidfile();
    if(pid) {
      KMessageBox::error(0L, err_msg);
      return 1;
    }
  }

  KPPPWidget kppp;
  p_kppp = &kppp;

  (void)new DockWidget(p_kppp->con_win, "dockw", p_kppp->stats);

  // we really don't want to die accidentally, since that would leave the
  // modem connected. If you really really want to kill me you must send
  // me a SIGKILL.
  signal(SIGINT, sighandler);
  signal(SIGCHLD, sighandler);
  signal(SIGUSR1, sighandler);
  signal(SIGTERM, SIG_IGN);

  //  XSetErrorHandler( kppp_x_errhandler );
  //  XSetIOErrorHandler( kppp_xio_errhandler );

  int ret = a.exec();

  remove_pidfile();

  return ret;
}


pid_t execute_command (const QString & cmd) {
  QByteArray command = QFile::encodeName(cmd);
  if (command.isEmpty() || command.length() > COMMAND_SIZE)
    return (pid_t) -1;

  pid_t id;

  kDebug(5002) << "Executing command: " << command;

  QApplication::flush();
  if((id = fork()) == 0) {
    // don't bother dieppp()
    signal(SIGCHLD, SIG_IGN);

    // close file descriptors
    const int open_max = sysconf( _SC_OPEN_MAX );
    for (int fd = 3; fd < open_max; ++fd)
      close(fd);

    // drop privileges if running setuid root
    setgid(getgid());
    setuid(getuid());

    system(command);
    _exit(0);
  }

  return id;
}


// Create a file containing the current pid. Returns 0 on success,
// -1 on failure or the pid of an already running kppp process.
pid_t create_pidfile() {
  int fd = -1;
  char pidstr[40]; // safe

  pidfile = KGlobal::dirs()->saveLocation("appdata") + "kppp.pid";

  if(access(QFile::encodeName(pidfile), F_OK) == 0) {

    if((access(QFile::encodeName(pidfile), R_OK) < 0) ||
       (fd = open(QFile::encodeName(pidfile), O_RDONLY)) < 0)
      return -1;

    int sz = read(fd, &pidstr, 32);
    close (fd);
    if (sz < 0)
      return -1;
    pidstr[sz] = '\0';

    kDebug(5002) << "found kppp.pid containing: " << pidstr;

    // non-empty file ?
    if (sz > 0) {
      int oldpid;
      int match = sscanf(pidstr, "%d", &oldpid);

      // found a pid in pidfile ?
      if (match < 1 || oldpid <= 0)
        return -1;

      // check if process exists
      if (kill((pid_t)oldpid, 0) == 0 || errno != ESRCH)
        return oldpid;
    }

    kDebug(5002) << "pidfile is stale\n";
    remove_pidfile();
  }

  if((fd = open(QFile::encodeName(pidfile), O_WRONLY | O_CREAT | O_EXCL,
                S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) == -1)
    return -1;

  fchown(fd, getuid(), getgid());

  sprintf(pidstr, "%d\n", getpid());
  write(fd, pidstr, strlen(pidstr));
  close(fd);

  return 0;
}


bool remove_pidfile() {
  struct stat st;

  // only remove regular files with user write permissions
  if(stat(QFile::encodeName(pidfile), &st) == 0 )
    if(S_ISREG(st.st_mode) && (access(QFile::encodeName(pidfile), W_OK) == 0)) {
      unlink(QFile::encodeName(pidfile));
      return true;
    }

  fprintf(stderr, "error removing pidfile.\n");
  return false;
}


void myShutDown() {
  pid_t pid;
  // don't bother about SIGCHLDs anymore
  signal(SIGCHLD, SIG_IGN);
  //  fprintf(stderr, "myShutDown(%i)\n", status);
  pid = helperPid;
  if(pid > 0) {
    helperPid = -1;
    //    fprintf(stderr, "killing child process %i", pid);
    kill(pid, SIGKILL);
  }
}

void sighandler(int sig) {
  QEvent *e = 0L;
  if(sig == SIGCHLD) {
    pid_t id = wait(0L);
    if(id >= 0 && id == helperPid) // helper process died
      e = new SignalEvent(sig);
  } else if(sig == SIGINT || sig == SIGUSR1)
    e = new SignalEvent(sig);

  // let eventFilter() deal with this when we're back in the loop
  if (e)
    QApplication::postEvent(p_kppp, e);

  signal(sig, sighandler); // reinstall signal handler
}