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/*****************************************************************
* drkonqi - The KDE Crash Handler
*
* Copyright (C) 2000-2003 Hans Petter Bieker <bieker@kde.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************/
#include <tqfile.h>
#include <tqregexp.h>
#include <kprocess.h>
#include <kdebug.h>
#include <kstandarddirs.h>
#include <kmessagebox.h>
#include <klocale.h>
#include <ktempfile.h>
#include "krashconf.h"
#include "backtrace.h"
#include "backtrace.moc"
BackTrace::BackTrace(const KrashConfig *krashconf, TQObject *parent,
const char *name)
: TQObject(parent, name),
m_krashconf(krashconf), m_temp(NULL), m_temp_cmd(NULL)
{
m_proc = new TDEProcess;
}
BackTrace::~BackTrace()
{
pid_t pid = m_proc ? m_proc->pid() : 0;
// we don't want the gdb process to hang around
delete m_proc; // this will kill gdb (SIGKILL, signal 9)
// continue the process we ran backtrace on. Gdb sends SIGSTOP to the
// process. For some reason it doesn't work if we send the signal before
// gdb has exited, so we better wait for it.
// Do not touch it if we never ran backtrace.
if (pid)
{
waitpid(pid, NULL, 0);
kill(m_krashconf->pid(), SIGCONT);
}
delete m_temp;
delete m_temp_cmd;
}
void BackTrace::start()
{
TQString exec = m_krashconf->tryExec();
if ( !exec.isEmpty() && TDEStandardDirs::findExe(exec).isEmpty() )
{
TQObject * o = parent();
if (o && !o->inherits(TQWIDGET_OBJECT_NAME_STRING))
{
o = NULL;
}
KMessageBox::error(
(TQWidget *)o,
i18n("Could not generate a backtrace as the debugger '%1' was not found.").arg(exec));
return;
}
m_temp = new KTempFile;
m_temp->setAutoDelete(TRUE);
int handle = m_temp->handle();
TQString backtraceCommand = m_krashconf->backtraceCommand();
const char* bt = backtraceCommand.latin1();
::write(handle, bt, strlen(bt)); // the command for a backtrace
::write(handle, "\n", 1);
::fsync(handle);
// build the debugger command
TQString str = m_krashconf->debuggerBatch();
m_krashconf->expandString(str, true, m_temp->name());
// write the debugger command
m_temp_cmd = new KTempFile(TQString::null, TQString::null, 0700);
m_temp_cmd->setAutoDelete(TRUE);
handle = m_temp_cmd->handle();
const char* dbgcommand = str.latin1();
::write(handle, dbgcommand, strlen(dbgcommand)); // the command to execute the debugger
::write(handle, "\n", 1);
::fsync(handle);
m_temp_cmd->close();
// determine if yama has been used to prevent ptrace as normal user
bool need_root_access = false;
TQFile yamactl("/proc/sys/kernel/yama/ptrace_scope");
if (yamactl.exists()) {
if (yamactl.open(IO_ReadOnly)) {
TQTextStream stream(&yamactl);
TQString line;
line = stream.readLine();
if (line.toInt() != 0) {
need_root_access = true;
}
yamactl.close();
}
}
// start the debugger
m_proc = new TDEProcess;
m_proc->setUseShell(true);
if (need_root_access == false) {
*m_proc << m_temp_cmd->name();
}
else {
*m_proc << "tdesu -t --comment \"" << i18n("Administrative access is required to generate a backtrace") << "\" -c \"" << m_temp_cmd->name() << "\"";
}
connect(m_proc, TQT_SIGNAL(receivedStdout(TDEProcess*, char*, int)),
TQT_SLOT(slotReadInput(TDEProcess*, char*, int)));
connect(m_proc, TQT_SIGNAL(processExited(TDEProcess*)),
TQT_SLOT(slotProcessExited(TDEProcess*)));
m_proc->start ( TDEProcess::NotifyOnExit, TDEProcess::All );
}
void BackTrace::slotReadInput(TDEProcess *, char* buf, int buflen)
{
TQString newstr = TQString::fromLocal8Bit(buf, buflen);
newstr.replace("\n\n", "\n");
if (m_strBt.isEmpty()) {
if (newstr == "\n") {
newstr = "";
}
}
if (!newstr.startsWith(": ")) {
m_strBt.append(newstr);
emit append(newstr);
}
}
void BackTrace::slotProcessExited(TDEProcess *proc)
{
// start it again
kill(m_krashconf->pid(), SIGCONT);
if (proc->normalExit() && (proc->exitStatus() == 0) &&
usefulBacktrace())
{
processBacktrace();
emit done(m_strBt);
}
else
emit someError();
}
// analyze backtrace for usefulness
bool BackTrace::usefulBacktrace()
{
// remove crap
if( !m_krashconf->removeFromBacktraceRegExp().isEmpty())
m_strBt.replace(TQRegExp( m_krashconf->removeFromBacktraceRegExp()), TQString());
if( m_krashconf->disableChecks())
return true;
// prepend and append newline, so that regexps like '\nwhatever\n' work on all lines
TQString strBt = '\n' + m_strBt + '\n';
// how many " ?? " in the bt ?
int unknown = 0;
if( !m_krashconf->invalidStackFrameRegExp().isEmpty())
unknown = strBt.contains( TQRegExp( m_krashconf->invalidStackFrameRegExp()));
// how many stack frames in the bt ?
int frames = 0;
if( !m_krashconf->frameRegExp().isEmpty())
frames = strBt.contains( TQRegExp( m_krashconf->frameRegExp()));
else
frames = strBt.contains('\n');
bool tooShort = false;
if( !m_krashconf->neededInValidBacktraceRegExp().isEmpty())
tooShort = ( strBt.find( TQRegExp( m_krashconf->neededInValidBacktraceRegExp())) == -1 );
return !m_strBt.isNull() && !tooShort && (unknown < frames);
}
// remove stack frames added because of TDECrash
void BackTrace::processBacktrace()
{
if( !m_krashconf->kcrashRegExp().isEmpty())
{
TQRegExp kcrashregexp( m_krashconf->kcrashRegExp());
int pos = kcrashregexp.search( m_strBt );
if( pos >= 0 )
{
int len = kcrashregexp.matchedLength();
if( m_strBt[ pos ] == '\n' )
{
++pos;
--len;
}
m_strBt.remove( pos, len );
m_strBt.insert( pos, TQString::fromLatin1( "[TDECrash handler]\n" ));
}
}
}
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