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tdenetwork/kppp/main.cpp

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/*
* 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.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>
static const char description[] =
I18N_NOOP("A dialer and front-end to pppd");
static const KCmdLineOptions options[] =
{
{ "c <account_name>", I18N_NOOP("Connect using 'account_name'"), 0 },
{ "m <modem_name>", I18N_NOOP("Connect using 'modem_name'"), 0 },
{ "k", I18N_NOOP("Terminate an existing connection"), 0 },
{ "q", I18N_NOOP("Quit after end of connection"), 0 },
{ "r <rule_file>", I18N_NOOP("Check syntax of rule_file"), 0 },
{ "T", I18N_NOOP("Enable test-mode"), 0 },
{ "dev <device_name>", I18N_NOOP("Use the specified device"), 0 },
KCmdLineLastOption
};
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;
TQString local_ip_address;
TQString remote_ip_address;
TQString 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 );
kdFatal() << "X Error: " << errstr << endl;
kdFatal() << "Major opcode: " << err->request_code << endl;
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{
kdFatal() << "Fatal IO error: client killed" << endl;
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]);
TDEAboutData aboutData("kppp", I18N_NOOP("KPPP"),
KPPPVERSION, description, TDEAboutData::License_GPL,
I18N_NOOP("(c) 1999-2002, The KPPP Developers"));
aboutData.addAuthor("Harri Porten", I18N_NOOP("Current maintainer"), "porten@kde.org");
aboutData.addAuthor("Bernd Wuebben", I18N_NOOP("Original author"), "wuebben@kde.org");
aboutData.addAuthor("Mario Weilguni",0, "");
TDECmdLineArgs::init( argc, argv, &aboutData );
TDECmdLineArgs::addCmdLineOptions( options );
TDEApplication a;
// set portable locale for decimal point
setlocale(LC_NUMERIC ,"C");
// open configuration file
gpppdata.open();
kdDebug(5002) << "helperPid: " << (int) helperPid << endl;
TDECmdLineArgs *args = TDECmdLineArgs::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
TQString configFile = TDEGlobal::dirs()->saveLocation("config")
+ TQString(kapp->name()) + "rc";
if(access(TQFile::encodeName(configFile), F_OK) == 0)
chmod(TQFile::encodeName(configFile), S_IRUSR | S_IWUSR);
// do we really need to generate an empty directory structure here ?
TDEGlobal::dirs()->saveLocation("appdata", "Rules");
int pid = create_pidfile();
TQString err_msg = i18n("kppp can't create or read from\n%1.").arg(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);
TQString s = argv[2];
urlEncode(s);
kdDebug(5002) << s << endl;
remove_pidfile();
return 0;
}
if (pid > 0) {
TQString 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.")
.arg(pidfile).arg(pid);
int button = KMessageBox::warningYesNo(0, msg, i18n("Error"),
i18n("Exit"), KStdGuiItem::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);
a.setMainWidget(&kppp);
a.setTopWidget(&kppp);
// 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 TQString & cmd) {
TQCString command = TQFile::encodeName(cmd);
if (command.isEmpty() || command.length() > COMMAND_SIZE)
return (pid_t) -1;
pid_t id;
kdDebug(5002) << "Executing command: " << command << endl;
TQApplication::flushX();
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 = TDEGlobal::dirs()->saveLocation("appdata") + "kppp.pid";
if(access(TQFile::encodeName(pidfile), F_OK) == 0) {
if((access(TQFile::encodeName(pidfile), R_OK) < 0) ||
(fd = open(TQFile::encodeName(pidfile), O_RDONLY)) < 0)
return -1;
int sz = read(fd, &pidstr, 32);
close (fd);
if (sz < 0)
return -1;
pidstr[sz] = '\0';
kdDebug(5002) << "found kppp.pid containing: " << pidstr << endl;
// 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;
}
kdDebug(5002) << "pidfile is stale\n" << endl;
remove_pidfile();
}
if((fd = open(TQFile::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(TQFile::encodeName(pidfile), &st) == 0 )
if(S_ISREG(st.st_mode) && (access(TQFile::encodeName(pidfile), W_OK) == 0)) {
unlink(TQFile::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) {
TQEvent *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)
TQApplication::postEvent(p_kppp, e);
signal(sig, sighandler); // reinstall signal handler
}