147 lines
4.6 KiB
C++
147 lines
4.6 KiB
C++
/*
|
|
* Copyright (c) 2006-2007 The Regents of The University of Michigan
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met: redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer;
|
|
* 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;
|
|
* neither the name of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "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 COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS 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.
|
|
*
|
|
* Authors: Gabe Black
|
|
*/
|
|
|
|
#include "tracechild.hh"
|
|
#include <cstring>
|
|
#include <errno.h>
|
|
#include <iostream>
|
|
#include <sys/ptrace.h>
|
|
#include <sys/wait.h>
|
|
|
|
using namespace std;
|
|
|
|
bool
|
|
TraceChild::startTracing(const char * pathToFile, char * const argv[])
|
|
{
|
|
instructions = 0;
|
|
pid = fork();
|
|
if (pid == -1) {
|
|
cout << "fork failed" << endl;
|
|
return false;
|
|
} else if (pid == 0) {
|
|
//We're the child. Get things ready and then exec the program to trace.
|
|
//Let our parent trace us
|
|
if (ptrace(PTRACE_TRACEME, 0, 0, 0) == -1) {
|
|
cout << "Failure calling TRACEME\n" << strerror(errno) << endl;
|
|
return false;
|
|
}
|
|
|
|
//Set up an empty environment for the child... We would want to
|
|
//specify this somehow at some point
|
|
char * env[] = {NULL};
|
|
|
|
//Start the program to trace
|
|
execve(pathToFile, argv, env);
|
|
|
|
//We should never get here, so this is an error!
|
|
cout << "Exec failed\n" << strerror(errno) << endl;
|
|
return false;
|
|
}
|
|
|
|
//From this point forward, we know we're in the parent process.
|
|
if (!doWait()) {
|
|
cout << "Didn't wait successfully" << endl;
|
|
return false;
|
|
}
|
|
tracing = true;
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
TraceChild::stopTracing()
|
|
{
|
|
if (ptrace(PTRACE_KILL, pid, 0, 0) != 0)
|
|
return false;
|
|
tracing = false;
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
TraceChild::step()
|
|
{
|
|
ptraceSingleStep();
|
|
}
|
|
|
|
bool
|
|
TraceChild::ptraceSingleStep()
|
|
{
|
|
if (!tracing) {
|
|
cout << "Not tracing!" << endl;
|
|
return false;
|
|
}
|
|
if (ptrace(PTRACE_SINGLESTEP, pid, 0, 0) != 0) {
|
|
switch (errno) {
|
|
case EBUSY: cout << "EBUSY" << endl; break;
|
|
case EFAULT: cout << "EFAULT" << endl; break;
|
|
case EIO: cout << "EIO" << endl; break;
|
|
case EPERM: cout << "EPERM" << endl; break;
|
|
case ESRCH: cout << "ESRCH" << endl; break;
|
|
default: cout << "Unknown error" << endl; break;
|
|
}
|
|
cout << "Not able to single step!" << endl;
|
|
tracing == false;
|
|
return false;
|
|
}
|
|
doWait();
|
|
update(pid);
|
|
}
|
|
|
|
bool
|
|
TraceChild::doWait()
|
|
{
|
|
int wait_val;
|
|
wait(&wait_val);
|
|
if (WIFEXITED(wait_val)) {
|
|
cerr << "Program exited! Exit status is "
|
|
<< WEXITSTATUS(wait_val) << endl;
|
|
cerr << "Executed " << instructions
|
|
<< " instructions." << endl;
|
|
tracing = false;
|
|
return false;
|
|
}
|
|
if (WIFSIGNALED(wait_val)) {
|
|
if (WTERMSIG(wait_val))
|
|
cerr << "Program terminated by signal "
|
|
<< WTERMSIG(wait_val) << endl;
|
|
if (WCOREDUMP(wait_val))
|
|
cerr << "Program core dumped!" << endl;
|
|
tracing = false;
|
|
cerr << "Executed " << instructions
|
|
<< " instructions." << endl;
|
|
return false;
|
|
}
|
|
if (WIFSTOPPED(wait_val) && WSTOPSIG(wait_val) != SIGTRAP) {
|
|
cerr << "Program stopped by signal " << WSTOPSIG(wait_val) << endl;
|
|
tracing = false;
|
|
cerr << "Executed " << instructions << " instructions." << endl;
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|