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// Copyright (c) 2018-2022, The Monero Project
//
// All rights reserved.
//
// 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.
//
// 3. Neither the name of the copyright holder 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 HOLDER 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.
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#ifdef _WIN32
#include <boost/algorithm/string/join.hpp>
#include <boost/scope_exit.hpp>
#include <windows.h>
#else
#include <sys/wait.h>
#include <signal.h>
#endif
#include "misc_log_ex.h"
#include "util.h"
#include "spawn.h"
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "spawn"
namespace tools
{
int spawn(const char *filename, const std::vector<std::string>& args, bool wait)
{
#ifdef _WIN32
std::string joined = boost::algorithm::join(args, " ");
char *commandLine = !joined.empty() ? &joined[0] : nullptr;
STARTUPINFOA si = {};
si.cb = sizeof(si);
PROCESS_INFORMATION pi;
if (!CreateProcessA(filename, commandLine, nullptr, nullptr, false, 0, nullptr, nullptr, &si, &pi))
{
MERROR("CreateProcess failed. Error code " << GetLastError());
return -1;
}
BOOST_SCOPE_EXIT(&pi)
{
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
}
BOOST_SCOPE_EXIT_END
if (!wait)
{
return 0;
}
DWORD result = WaitForSingleObject(pi.hProcess, INFINITE);
if (result != WAIT_OBJECT_0)
{
MERROR("WaitForSingleObject failed. Result " << result << ", error code " << GetLastError());
return -1;
}
DWORD exitCode;
if (!GetExitCodeProcess(pi.hProcess, &exitCode))
{
MERROR("GetExitCodeProcess failed. Error code " << GetLastError());
return -1;
}
MINFO("Child exited with " << exitCode);
return static_cast<int>(exitCode);
#else
std::vector<char*> argv(args.size() + 1);
for (size_t n = 0; n < args.size(); ++n)
argv[n] = (char*)args[n].c_str();
argv[args.size()] = NULL;
pid_t pid = fork();
if (pid < 0)
{
MERROR("Error forking: " << strerror(errno));
return -1;
}
// child
if (pid == 0)
{
tools::closefrom(3);
close(0);
char *envp[] = {NULL};
execve(filename, argv.data(), envp);
MERROR("Failed to execve: " << strerror(errno));
return -1;
}
// parent
if (pid > 0)
{
if (!wait)
{
signal(SIGCHLD, SIG_IGN);
return 0;
}
while (1)
{
int wstatus = 0;
pid_t w = waitpid(pid, &wstatus, WUNTRACED | WCONTINUED);
if (w < 0) {
MERROR("Error waiting for child: " << strerror(errno));
return -1;
}
if (WIFEXITED(wstatus))
{
MINFO("Child exited with " << WEXITSTATUS(wstatus));
return WEXITSTATUS(wstatus);
}
if (WIFSIGNALED(wstatus))
{
MINFO("Child killed by " << WEXITSTATUS(wstatus));
return WEXITSTATUS(wstatus);
}
}
}
MERROR("Secret passage found");
return -1;
#endif
}
}
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