mirror of
https://github.com/oxen-io/oxen-core.git
synced 2023-12-14 02:22:56 +01:00
172 lines
5.3 KiB
C++
172 lines
5.3 KiB
C++
// Copyright (c) 2019, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <errno.h>
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#include <sys/types.h>
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#include <unistd.h>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <signal.h>
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#include <sys/wait.h>
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#endif
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#include "epee/misc_log_ex.h"
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#include "logging/oxen_logger.h"
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#include "oxen.h"
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#include "spawn.h"
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#include "string_util.h"
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#include "util.h"
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namespace tools {
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static auto logcat = log::Cat("spawn");
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#ifndef _WIN32
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static void closefrom(int fd) {
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#if defined __FreeBSD__ || defined __OpenBSD__ || defined __NetBSD__ || defined __DragonFly__
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::closefrom(fd);
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#else
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#if defined __GLIBC__
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const int sc_open_max = sysconf(_SC_OPEN_MAX);
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const int MAX_FDS = std::min(65536, sc_open_max);
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#else
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const int MAX_FDS = 65536;
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#endif
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while (fd < MAX_FDS) {
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close(fd);
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++fd;
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}
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#endif
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}
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#endif
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int spawn(const fs::path& filename, const std::vector<std::string>& args, bool wait) {
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#ifdef _WIN32
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std::string joined = tools::join(" ", args);
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char* commandLine = !joined.empty() ? &joined[0] : nullptr;
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STARTUPINFOA si = {};
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si.cb = sizeof(si);
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PROCESS_INFORMATION pi;
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// This .string() is wrong for non-ascii paths, but if we switch to CreateProcessW and use
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// .c_str() directly our commandLine argument will not be accepted (because it then has to be a
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// wchar_t* but out input is utf-8). Shame on you for this garbage API, Windows.
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if (!CreateProcessA(
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filename.string().c_str(),
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commandLine,
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nullptr,
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nullptr,
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false,
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0,
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nullptr,
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nullptr,
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&si,
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&pi)) {
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log::error(logcat, "CreateProcess failed. Error code {}", GetLastError());
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return -1;
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}
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OXEN_DEFER {
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CloseHandle(pi.hThread);
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CloseHandle(pi.hProcess);
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};
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if (!wait) {
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return 0;
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}
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DWORD result = WaitForSingleObject(pi.hProcess, INFINITE);
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if (result != WAIT_OBJECT_0) {
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log::error(
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logcat,
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"WaitForSingleObject failed. Result {}, error code {}",
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result,
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GetLastError());
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return -1;
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}
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DWORD exitCode;
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if (!GetExitCodeProcess(pi.hProcess, &exitCode)) {
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log::error(logcat, "GetExitCodeProcess failed. Error code {}", GetLastError());
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return -1;
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}
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log::info(logcat, "Child exited with {}", exitCode);
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return static_cast<int>(exitCode);
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#else
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std::vector<char*> argv(args.size() + 1);
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for (size_t n = 0; n < args.size(); ++n)
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argv[n] = (char*)args[n].c_str();
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argv[args.size()] = NULL;
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pid_t pid = fork();
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if (pid < 0) {
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log::error(logcat, "Error forking: {}", strerror(errno));
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return -1;
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}
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// child
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if (pid == 0) {
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tools::closefrom(3);
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close(0);
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char* envp[] = {NULL};
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execve(filename.c_str(), argv.data(), envp);
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log::error(logcat, "Failed to execve: {}", strerror(errno));
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return -1;
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}
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// parent
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if (pid > 0) {
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if (!wait) {
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signal(SIGCHLD, SIG_IGN);
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return 0;
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}
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while (1) {
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int wstatus = 0;
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pid_t w = waitpid(pid, &wstatus, WUNTRACED | WCONTINUED);
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if (w < 0) {
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log::error(logcat, "Error waiting for child: {}", strerror(errno));
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return -1;
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}
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if (WIFEXITED(wstatus)) {
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log::info(logcat, "Child exited with {}", WEXITSTATUS(wstatus));
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return WEXITSTATUS(wstatus);
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}
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if (WIFSIGNALED(wstatus)) {
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log::info(logcat, "Child killed by {}", WEXITSTATUS(wstatus));
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return WEXITSTATUS(wstatus);
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}
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}
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}
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log::error(logcat, "Secret passage found");
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return -1;
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#endif
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}
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} // namespace tools
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