execpppd returns true on success, not zero

1 files changed, 1 insertions, 1 deletions

diff --git a/noncore/settings/networksettings/ppp/modem.cpp b/noncore/settings/networksettings/ppp/modem.cpp
index 2da9b14..d23fee4 100644
--- a/noncore/settings/networksettings/ppp/modem.cpp
+++ b/noncore/settings/networksettings/ppp/modem.cpp
@@ -1,1023 +1,1023 @@
 /*
  *              kPPP: A pppd Front End for the KDE project
  *
  * $Id$
  *
  *              Copyright (C) 1997 Bernd Johannes Wuebben
  *                      wuebben@math.cornell.edu
  *
  * This file was added by Harri Porten <porten@tu-harburg.de>
  *
  *
  * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include <errno.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <setjmp.h>
 #include <regex.h>
 #include <qregexp.h>
 #include <assert.h>
 #include <string.h>
 
 #ifdef HAVE_RESOLV_H
 #  include <arpa/nameser.h>
 #  include <resolv.h>
 #endif
 
 #ifndef _PATH_RESCONF
 #define _PATH_RESCONF "/etc/resolv.conf"
 #endif
 
 #define strlcpy strcpy
 #include "auth.h"
 #include "modem.h"
 #include "pppdata.h"
 //#include <klocale.h>
 #define i18n QObject::tr
 #define qError qDebug
 //#include <kdebug.h>
 //#include <config.h>
 
 #define MY_ASSERT(x)  if (!(x)) { \
         qFatal( "ASSERT: \"%s\" in %s (%d)\n",#x,__FILE__,__LINE__); \
         exit(1); }
 
 
 static sigjmp_buf jmp_buffer;
 
 //Modem *Modem::modem = 0;
 
 
 const char* pppdPath() {
   // wasting a few bytes
   static char buffer[sizeof(PPPDSEARCHPATH)+sizeof(PPPDNAME)];
   static char *pppdPath = 0L;
   char *p;
 
   if(pppdPath == 0L) {
     const char *c = PPPDSEARCHPATH;
     while(*c != '\0') {
       while(*c == ':')
         c++;
       p = buffer;
       while(*c != '\0' && *c != ':')
         *p++ = *c++;
       *p = '\0';
       strcat(p, "/");
       strcat(p, PPPDNAME);
       if(access(buffer, F_OK) == 0)
         return (pppdPath = buffer);
     }
   }
 
   return pppdPath;
 }
 
 
 Modem::Modem( PPPData* pd )
 {
     _pppdata = pd;
     modemfd = -1;
     _pppdExitStatus = -1;
     pppdPid = -1;
     sn = 0L;
     data_mode = false;
     modem_is_locked = false;
     lockfile[0] = '\0';
     device = "/dev/modem";
 }
 
 
 Modem::~Modem()
 {
 }
 
 
 speed_t Modem::modemspeed() {
   // convert the string modem speed int the gpppdata object to a t_speed type
   // to set the modem.  The constants here should all be ifdef'd because
   // other systems may not have them
     int i = _pppdata->speed().toInt()/100;
 
   switch(i) {
   case 24:
     return B2400;
     break;
   case 96:
     return B9600;
     break;
   case 192:
     return B19200;
     break;
   case 384:
     return B38400;
     break;
 #ifdef B57600
   case 576:
     return B57600;
     break;
 #endif
 
 #ifdef B115200
   case 1152:
     return B115200;
     break;
 #endif
 
 #ifdef B230400
   case 2304:
     return B230400;
     break;
 #endif
 
 #ifdef B460800
   case 4608:
     return B460800;
     break;
 #endif
 
   default:
     return B38400;
     break;
   }
 }
 
 bool Modem::opentty() {
   //  int flags;
 
 //begin  if((modemfd = Requester::rq->openModem(gpppdata.modemDevice()))<0) {
     close(modemfd);
     device = _pppdata->modemDevice();
     if ((modemfd = open(device, O_RDWR|O_NDELAY|O_NOCTTY)) == -1) {
         qDebug("error opening modem device !");
         errmsg = i18n("Unable to open modem.");
         return false;
     }
 //bend  if((modemfd = Requester::rq->openModem(gpppdata.modemDevice()))<0) {
 //}
 
 #if 0
   if(_pppdata->UseCDLine()) {
     if(ioctl(modemfd, TIOCMGET, &flags) == -1) {
       errmsg = i18n("Unable to detect state of CD line.");
       ::close(modemfd);
       modemfd = -1;
       return false;
     }
     if ((flags&TIOCM_CD) == 0) {
       errmsg = i18n("The modem is not ready.");
       ::close(modemfd);
       modemfd = -1;
       return false;
     }
   }
 #endif
 
   tcdrain (modemfd);
   tcflush (modemfd, TCIOFLUSH);
 
   if(tcgetattr(modemfd, &tty) < 0){
     // this helps in some cases
     tcsendbreak(modemfd, 0);
     sleep(1);
     if(tcgetattr(modemfd, &tty) < 0){
       errmsg = i18n("The modem is busy.");
       ::close(modemfd);
       modemfd = -1;
       return false;
     }
   }
 
   memset(&initial_tty,'\0',sizeof(initial_tty));
 
   initial_tty = tty;
 
   tty.c_cc[VMIN] = 0; // nonblocking
   tty.c_cc[VTIME] = 0;
   tty.c_oflag = 0;
   tty.c_lflag = 0;
 
   tty.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
   tty.c_cflag |= CS8 | CREAD;
   tty.c_cflag |= CLOCAL;                   // ignore modem status lines
   tty.c_iflag = IGNBRK | IGNPAR /* | ISTRIP */ ;
   tty.c_lflag &= ~ICANON;                  // non-canonical mode
   tty.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHOKE);
 
 
   if(_pppdata->flowcontrol() != "None") {
       if(_pppdata->flowcontrol() == "CRTSCTS") {
       tty.c_cflag |= CRTSCTS;
     }
     else {
       tty.c_iflag |= IXON | IXOFF;
       tty.c_cc[VSTOP]  = 0x13; /* DC3 = XOFF = ^S */
       tty.c_cc[VSTART] = 0x11; /* DC1 = XON  = ^Q */
     }
   }
   else {
     tty.c_cflag &= ~CRTSCTS;
     tty.c_iflag &= ~(IXON | IXOFF);
   }
 
   cfsetospeed(&tty, modemspeed());
   cfsetispeed(&tty, modemspeed());
 
   tcdrain(modemfd);
 
   if(tcsetattr(modemfd, TCSANOW, &tty) < 0){
     errmsg = i18n("The modem is busy.");
     ::close(modemfd);
     modemfd=-1;
     return false;
   }
 
   errmsg = i18n("Modem Ready.");
   return true;
 }
 
 
 bool Modem::closetty() {
   if(modemfd >=0 ) {
     stop();
     /* discard data not read or transmitted */
     tcflush(modemfd, TCIOFLUSH);
 
     if(tcsetattr(modemfd, TCSANOW, &initial_tty) < 0){
       errmsg = i18n("Can't restore tty settings: tcsetattr()\n");
       ::close(modemfd);
       modemfd = -1;
       return false;
     }
     ::close(modemfd);
     modemfd = -1;
   }
 
   return true;
 }
 
 
 void Modem::readtty(int) {
   char buffer[200];
   unsigned char c;
   int len;
 
   // read data in chunks of up to 200 bytes
   if((len = ::read(modemfd, buffer, 200)) > 0) {
     // split buffer into single characters for further processing
     for(int i = 0; i < len; i++) {
       c = buffer[i] & 0x7F;
       emit charWaiting(c);
     }
   }
 }
 
 
 void Modem::notify(const QObject *receiver, const char *member) {
   connect(this, SIGNAL(charWaiting(unsigned char)), receiver, member);
   startNotifier();
 }
 
 
 void Modem::stop() {
   disconnect(SIGNAL(charWaiting(unsigned char)));
   stopNotifier();
 }
 
 
 void Modem::startNotifier() {
   if(modemfd >= 0) {
     if(sn == 0) {
       sn = new QSocketNotifier(modemfd, QSocketNotifier::Read, this);
       connect(sn, SIGNAL(activated(int)), SLOT(readtty(int)));
       qDebug("QSocketNotifier started!");
     } else {
         qDebug("QSocketNotifier re-enabled!");
         sn->setEnabled(true);
     }
   }
 }
 
 
 void Modem::stopNotifier() {
   if(sn != 0) {
     sn->setEnabled(false);
     disconnect(sn);
     delete sn;
     sn = 0;
     qDebug( "QSocketNotifier stopped!" );
   }
 }
 
 
 void Modem::flush() {
   char c;
   while(read(modemfd, &c, 1) == 1);
 }
 
 
 bool Modem::writeChar(unsigned char c) {
   int s;
   do {
     s = write(modemfd, &c, 1);
     if (s < 0) {
       qError( "write() in Modem::writeChar failed" );
       return false;
     }
   } while(s == 0);
 
   return true;
 }
 
 
 bool Modem::writeLine(const char *buf) {
   int len = strlen(buf);
   char *b = new char[len+2];
   memcpy(b, buf, len);
   // different modems seem to need different line terminations
   QString term = _pppdata->enter();
   if(term == "LF")
     b[len++]='\n';
   else if(term == "CR")
     b[len++]='\r';
   else if(term == "CR/LF") {
     b[len++]='\r';
     b[len++]='\n';
   }
   int l = len;
   while(l) {
     int wr = write(modemfd, &b[len-l], l);
     if(wr < 0) {
       // TODO do something meaningful with the error code (or ignore it
       qError( "write() in Modem::writeLine failed" );
       delete[] b;
       return false;
     }
     l -= wr;
   }
   delete[] b;
   return true;
 }
 
 
 bool Modem::hangup() {
   // this should really get the modem to hang up and go into command mode
   // If anyone sees a fault in the following please let me know, since
   // this is probably the most imporant snippet of code in the whole of
   // kppp. If people complain about kppp being stuck, this piece of code
   // is most likely the reason.
   struct termios temptty;
 
   if(modemfd >= 0) {
 
     // is this Escape & HangupStr stuff really necessary ? (Harri)
 
     if (data_mode) escape_to_command_mode();
 
     // Then hangup command
     writeLine(_pppdata->modemHangupStr().local8Bit());
 
     usleep(_pppdata->modemInitDelay() * 10000); // 0.01 - 3.0 sec
 
 #ifndef DEBUG_WO_DIALING
     if (sigsetjmp(jmp_buffer, 1) == 0) {
       // set alarm in case tcsendbreak() hangs
       signal(SIGALRM, alarm_handler);
       alarm(2);
 
       tcsendbreak(modemfd, 0);
 
       alarm(0);
       signal(SIGALRM, SIG_IGN);
     } else {
       // we reach this point if the alarm handler got called
       closetty();
       close(modemfd);
       modemfd = -1;
       errmsg = i18n("The modem does not respond.");
       return false;
     }
 
 #ifndef __svr4__ // drops DTR but doesn't set it afterwards again. not good for init.
     tcgetattr(modemfd, &temptty);
     cfsetospeed(&temptty, B0);
     cfsetispeed(&temptty, B0);
     tcsetattr(modemfd, TCSAFLUSH, &temptty);
 #else
     int modemstat;
     ioctl(modemfd, TIOCMGET, &modemstat);
     modemstat &= ~TIOCM_DTR;
     ioctl(modemfd, TIOCMSET, &modemstat);
     ioctl(modemfd, TIOCMGET, &modemstat);
     modemstat |= TIOCM_DTR;
     ioctl(modemfd, TIOCMSET, &modemstat);
 #endif
 
     usleep(_pppdata->modemInitDelay() * 10000); // 0.01 - 3.0 secs
 
     cfsetospeed(&temptty, modemspeed());
     cfsetispeed(&temptty, modemspeed());
     tcsetattr(modemfd, TCSAFLUSH, &temptty);
 #endif
     return true;
   } else
     return false;
 }
 
 
 void Modem::escape_to_command_mode() {
   // Send Properly bracketed escape code to put the modem back into command state.
   // A modem will accept AT commands only when it is in command state.
   // When a modem sends the host the CONNECT string, that signals
   // that the modem is now in the connect state (no long accepts AT commands.)
   // Need to send properly timed escape sequence to put modem in command state.
   // Escape codes and guard times are controlled by S2 and S12 values.
   //
   tcflush(modemfd, TCIOFLUSH);
 
   // +3 because quiet time must be greater than guard time.
   usleep((_pppdata->modemEscapeGuardTime()+3)*20000);
   QCString tmp = _pppdata->modemEscapeStr().local8Bit();
   write(modemfd, tmp.data(), tmp.length());
   tcflush(modemfd, TCIOFLUSH);
   usleep((_pppdata->modemEscapeGuardTime()+3)*20000);
 
   data_mode = false;
 }
 
 
 const QString Modem::modemMessage() {
   return errmsg;
 }
 
 
 QString Modem::parseModemSpeed(const QString &s) {
   // this is a small (and bad) parser for modem speeds
   int rx = -1;
   int tx = -1;
   int i;
   QString result;
 
   qDebug( "Modem reported result string: %s", s.latin1());
 
   const int RXMAX = 7;
   const int TXMAX = 2;
   QRegExp rrx[RXMAX] = {
     QRegExp("[0-9]+[:/ ]RX", false),
     QRegExp("[0-9]+RX", false),
     QRegExp("[/: -][0-9]+[/: ]", false),
     QRegExp("[/: -][0-9]+$", false),
     QRegExp("CARRIER [^0-9]*[0-9]+", false),
     QRegExp("CONNECT [^0-9]*[0-9]+", false),
     QRegExp("[0-9]+") // panic mode
   };
 
   QRegExp trx[TXMAX] = {
     QRegExp("[0-9]+[:/ ]TX", false),
     QRegExp("[0-9]+TX", false)
   };
 
   for(i = 0; i < RXMAX; i++) {
     int len, idx, result;
     if((idx = rrx[i].match(s,0,&len)) > -1) {
 //    if((idx = rrx[i].search(s)) > -1) {
         //     len = rrx[i].matchedLength();
 
       //
       // rrx[i] has been matched, idx contains the start of the match
       // and len contains how long the match is. Extract the match.
       //
       QString sub = s.mid(idx, len);
 
       //
       // Now extract the digits only from the match, which will
       // then be converted to an int.
       //
       if ((idx = rrx[RXMAX-1].match( sub,0,&len )) > -1) {
 //      if ((idx = rrx[RXMAX-1].search( sub )) > -1) {
 //        len = rrx[RXMAX-1].matchedLength();
         sub = sub.mid(idx, len);
         result = sub.toInt();
         if(result > 0) {
           rx = result;
           break;
         }
       }
     }
   }
 
   for(i = 0; i < TXMAX; i++) {
     int len, idx, result;
     if((idx = trx[i].match(s,0,&len)) > -1) {
 //    if((idx = trx[i].search(s)) > -1) {
 //      len = trx[i].matchedLength();
 
       //
       // trx[i] has been matched, idx contains the start of the match
       // and len contains how long the match is. Extract the match.
       //
       QString sub = s.mid(idx, len);
 
       //
       // Now extract the digits only from the match, which will then
       // be converted to an int.
       //
       if((idx = rrx[RXMAX-1].match(sub,0,&len)) > -1) {
 //      if((idx = rrx[RXMAX-1].search(sub)) > -1) {
 //        len = rrx[RXMAX-1].matchedLength();
         sub = sub.mid(idx, len);
         result = sub.toInt();
         if(result > 0) {
           tx = result;
           break;
         }
       }
     }
   }
 
   if(rx == -1 && tx == -1)
     result = i18n("Unknown speed");
   else if(tx == -1)
     result.setNum(rx);
   else if(rx == -1) // should not happen
     result.setNum(tx);
   else
     result.sprintf("%d/%d", rx, tx);
 
   qDebug( "The parsed result is: %s", result.latin1());
 
   return result;
 }
 
 
 // Lock modem device. Returns 0 on success 1 if the modem is locked and -1 if
 // a lock file can't be created ( permission problem )
 int Modem::lockdevice() {
   int fd;
   char newlock[80]=""; // safe
 
   if(!_pppdata->modemLockFile()) {
     qDebug("The user doesn't want a lockfile.");
     return 0;
   }
 
   if (modem_is_locked)
     return 1;
 
   QString lockfile = LOCK_DIR"/LCK..";
   lockfile += _pppdata->modemDevice().mid(5); // append everything after /dev/
 
   if(access(QFile::encodeName(lockfile), F_OK) == 0) {
 //    if ((fd = Requester::rq->
 if ((fd = openLockfile(QFile::encodeName(lockfile), O_RDONLY)) >= 0) {
       // Mario: it's not necessary to read more than lets say 32 bytes. If
       // file has more than 32 bytes, skip the rest
       char oldlock[33]; // safe
       int sz = read(fd, &oldlock, 32);
       close (fd);
       if (sz <= 0)
         return 1;
       oldlock[sz] = '\0';
 
       qDebug( "Device is locked by: %s", oldlock);
 
       int oldpid;
       int match = sscanf(oldlock, "%d", &oldpid);
 
       // found a pid in lockfile ?
       if (match < 1 || oldpid <= 0)
         return 1;
 
       // check if process exists
       if (kill((pid_t)oldpid, 0) == 0 || errno != ESRCH)
         return 1;
 
       qDebug( "lockfile is stale" );
     }
   }
 
   fd = openLockfile(_pppdata->modemDevice(),O_WRONLY|O_TRUNC|O_CREAT);
   if(fd >= 0) {
     sprintf(newlock,"%010d\n", getpid());
     qDebug("Locking Device: %s", newlock);
 
     write(fd, newlock, strlen(newlock));
     close(fd);
     modem_is_locked=true;
 
     return 0;
   }
 
   return -1;
 
 }
 
 
 // UnLock modem device
 void Modem::unlockdevice() {
   if (modem_is_locked) {
     qDebug( "UnLocking Modem Device" );
     close(modemfd);
     modemfd = -1;
     unlink(lockfile);
     lockfile[0] = '\0';
     modem_is_locked=false;
   }
 }
 
 int Modem::openLockfile( QString lockfile, int flags)
 {
     int fd;
     int mode;
     flags = O_RDONLY;
     if(flags == O_WRONLY|O_TRUNC|O_CREAT)
         mode = 0644;
     else
         mode = 0;
 
     lockfile = LOCK_DIR;
     lockfile += "/LCK..";
     lockfile += device.right( device.length() - device.findRev("/") -1 );
     qDebug("lockfile >%s<",lockfile.latin1());
     // TODO:
     //   struct stat st;
     //   if(stat(lockfile.data(), &st) == -1) {
     //     if(errno == EBADF)
     //       return -1;
     //   } else {
     //     // make sure that this is a regular file
     //     if(!S_ISREG(st.st_mode))
     //       return -1;
     //   }
     if ((fd = open(lockfile, flags, mode)) == -1) {
         qDebug("error opening lockfile!");
         lockfile = QString::null;
         fd = open(DEVNULL, O_RDONLY);
     } else
         fchown(fd, 0, 0);
     return fd;
 }
 
 
 
 void alarm_handler(int) {
   //  fprintf(stderr, "alarm_handler(): Received SIGALRM\n");
 
   // jump
   siglongjmp(jmp_buffer, 1);
 }
 
 
 const char* Modem::authFile(Auth method, int version) {
   switch(method|version) {
   case PAP|Original:
     return PAP_AUTH_FILE;
     break;
   case PAP|New:
     return PAP_AUTH_FILE".new";
     break;
   case PAP|Old:
     return PAP_AUTH_FILE".old";
     break;
   case CHAP|Original:
     return CHAP_AUTH_FILE;
     break;
   case CHAP|New:
     return CHAP_AUTH_FILE".new";
     break;
   case CHAP|Old:
     return CHAP_AUTH_FILE".old";
     break;
   default:
     return 0L;
   }
 }
 
 
 bool Modem::createAuthFile(Auth method, const char *username, const char *password) {
   const char *authfile, *oldName, *newName;
   char line[100];
   char regexp[2*MaxStrLen+30];
   regex_t preg;
 
   if(!(authfile = authFile(method)))
     return false;
 
   if(!(newName = authFile(method, New)))
     return false;
 
   // look for username, "username" or 'username'
   // if you modify this RE you have to adapt regexp's size above
   snprintf(regexp, sizeof(regexp), "^[ \t]*%s[ \t]\\|^[ \t]*[\"\']%s[\"\']",
           username,username);
   MY_ASSERT(regcomp(&preg, regexp, 0) == 0);
 
   // copy to new file pap- or chap-secrets
   int old_umask = umask(0077);
   FILE *fout = fopen(newName, "w");
   if(fout) {
     // copy old file
     FILE *fin = fopen(authfile, "r");
     if(fin) {
       while(fgets(line, sizeof(line), fin)) {
         if(regexec(&preg, line, 0, 0L, 0) == 0)
            continue;
         fputs(line, fout);
       }
       fclose(fin);
     }
 
     // append user/pass pair
     fprintf(fout, "\"%s\"\t*\t\"%s\"\n", username, password);
     fclose(fout);
   }
 
   // restore umask
   umask(old_umask);
 
   // free memory allocated by regcomp
   regfree(&preg);
 
   if(!(oldName = authFile(method, Old)))
     return false;
 
   // delete old file if any
   unlink(oldName);
 
   rename(authfile, oldName);
   rename(newName, authfile);
 
   return true;
 }
 
 
 bool Modem::removeAuthFile(Auth method) {
   const char *authfile, *oldName;
 
   if(!(authfile = authFile(method)))
     return false;
   if(!(oldName = authFile(method, Old)))
     return false;
 
   if(access(oldName, F_OK) == 0) {
     unlink(authfile);
     return (rename(oldName, authfile) == 0);
   } else
     return false;
 }
 
 
 bool Modem::setSecret(int method, const char* name, const char* password)
 {
 
     Auth auth;
     if(method == AUTH_PAPCHAP)
         return setSecret(AUTH_PAP, name, password) &&
             setSecret(AUTH_CHAP, name, password);
 
     switch(method) {
     case AUTH_PAP:
         auth = Modem::PAP;
         break;
     case AUTH_CHAP:
         auth = Modem::CHAP;
         break;
     default:
         return false;
     }
 
     return createAuthFile(auth, name, password);
 
 }
 
 bool Modem::removeSecret(int method)
 {
    Auth auth;
 
     switch(method) {
     case AUTH_PAP:
         auth = Modem::PAP;
         break;
     case AUTH_CHAP:
         auth = Modem::CHAP;
         break;
     default:
         return false;
     }
     return removeAuthFile( auth );
 }
 
 int checkForInterface()
 {
 // I don't know if Linux needs more initialization to get the ioctl to
 // work, pppd seems to hint it does.  But BSD doesn't, and the following
 // code should compile.
 #if (defined(HAVE_NET_IF_PPP_H) || defined(HAVE_LINUX_IF_PPP_H)) && !defined(__svr4__)
     int s, ok;
     struct ifreq ifr;
     //    extern char *no_ppp_msg;
 
     if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
         return 1;               /* can't tell */
 
     strlcpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
     ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
     close(s);
 
     if (ok == -1) {
 // This is ifdef'd FreeBSD, because FreeBSD is the only BSD that supports
 // KLDs, the old LKM interface couldn't handle loading devices
 // dynamically, and thus can't load ppp support on the fly
 #ifdef __FreeBSD__
         // If we failed to load ppp support and don't have it already.
         if (kldload("if_ppp") == -1) {
             return -1;
         }
         return 0;
 #else
         return -1;
 #endif
     }
     return 0;
 #else
 // We attempt to use the SunOS/SysVr4 method and stat /dev/ppp
    struct stat buf;
 
    memset(&buf, 0, sizeof(buf));
    return stat("/dev/ppp", &buf);
 #endif
 }
 
 bool Modem::execpppd(const char *arguments) {
   char buf[MAX_CMDLEN];
   char *args[MaxArgs];
   pid_t pgrpid;
 
   if(modemfd<0)
     return false;
 
   _pppdExitStatus = -1;
 
   switch(pppdPid = fork())
     {
     case -1:
       fprintf(stderr,"In parent: fork() failed\n");
       return false;
       break;
 
     case 0:
       // let's parse the arguments the user supplied into UNIX suitable form
       // that is a list of pointers each pointing to exactly one word
       strlcpy(buf, arguments);
       parseargs(buf, args);
       // become a session leader and let /dev/ttySx
       // be the controlling terminal.
       pgrpid = setsid();
 #ifdef TIOCSCTTY
       if(ioctl(modemfd, TIOCSCTTY, 0)<0)
         fprintf(stderr, "ioctl() failed.\n");
 #elif defined (TIOCSPGRP)
        if(ioctl(modemfd, TIOCSPGRP, &pgrpid)<0)
        fprintf(stderr, "ioctl() failed.\n");
 #endif
       if(tcsetpgrp(modemfd, pgrpid)<0)
         fprintf(stderr, "tcsetpgrp() failed.\n");
 
       dup2(modemfd, 0);
       dup2(modemfd, 1);
 
       switch (checkForInterface()) {
         case 1:
           fprintf(stderr, "Cannot determine if kernel supports ppp.\n");
           break;
         case -1:
           fprintf(stderr, "Kernel does not support ppp, oops.\n");
           break;
         case 0:
           fprintf(stderr, "Kernel supports ppp alright.\n");
           break;
       }
 
       execve(pppdPath(), args, 0L);
       _exit(0);
       break;
 
     default:
       qDebug("In parent: pppd pid %d\n",pppdPid);
       close(modemfd);
       modemfd = -1;
       return true;
       break;
     }
 }
 
 
 bool Modem::killpppd() {
   if(pppdPid > 0) {
     qDebug("In killpppd(): Sending SIGTERM to %d\n", pppdPid);
     if(kill(pppdPid, SIGTERM) < 0) {
       qDebug("Error terminating %d. Sending SIGKILL\n", pppdPid);
       if(kill(pppdPid, SIGKILL) < 0) {
         qDebug("Error killing %d\n", pppdPid);
         return false;
       }
     }
   }
   return true;
 }
 
 
 void Modem::parseargs(char* buf, char** args) {
   int nargs = 0;
   int quotes;
 
   while(nargs < MaxArgs-1 && *buf != '\0') {
 
     quotes = 0;
 
     // Strip whitespace. Use nulls, so that the previous argument is
     // terminated automatically.
 
     while ((*buf == ' ' ) || (*buf == '\t' ) || (*buf == '\n' ) )
       *buf++ = '\0';
 
     // detect begin of quoted argument
     if (*buf == '"' || *buf == '\'') {
       quotes = *buf;
       *buf++ = '\0';
     }
 
     // save the argument
     if(*buf != '\0') {
       *args++ = buf;
       nargs++;
     }
 
     if (!quotes)
       while ((*buf != '\0') && (*buf != '\n') &&
 	     (*buf != '\t') && (*buf != ' '))
 	buf++;
     else {
       while ((*buf != '\0') && (*buf != quotes))
 	buf++;
       *buf++ = '\0';
     }
   }
 
   *args = 0L;
 }
 
 bool Modem::execPPPDaemon(const QString & arguments)
 {
-  if(execpppd(arguments)==0) {
+  if(execpppd(arguments)) {
     _pppdata->setpppdRunning(true);
     return true;
   } else
     return false;
 }
 
 void Modem::killPPPDaemon()
 {
   _pppdata->setpppdRunning(false);
   killpppd();
 }
 
 int Modem::pppdExitStatus()
 {
     return _pppdExitStatus;
 }
 
 int Modem::openResolv(int flags)
 {
     int fd;
     if ((fd = open(_PATH_RESCONF, flags)) == -1) {
         qDebug("error opening resolv.conf!");
         fd = open(DEVNULL, O_RDONLY);
     }
     return fd;
 }
 
 bool Modem::setHostname(const QString & name)
 {
     return sethostname(name, name.length()) == 0;
 }