139 lines
3.4 KiB
C++
139 lines
3.4 KiB
C++
/*
|
|
* nghttp2 - HTTP/2 C Library
|
|
*
|
|
* Copyright (c) 2016 Tatsuhiro Tsujikawa
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
#include "shrpx_exec.h"
|
|
|
|
#include <cerrno>
|
|
|
|
#include "shrpx_signal.h"
|
|
#include "shrpx_log.h"
|
|
#include "util.h"
|
|
#include "template.h"
|
|
|
|
using namespace nghttp2;
|
|
|
|
namespace shrpx {
|
|
|
|
// inspired by h2o_read_command function from h2o project:
|
|
// https://github.com/h2o/h2o
|
|
int exec_read_command(Process &proc, char *const argv[]) {
|
|
int rv;
|
|
int pfd[2];
|
|
|
|
#ifdef O_CLOEXEC
|
|
if (pipe2(pfd, O_CLOEXEC) == -1) {
|
|
return -1;
|
|
}
|
|
#else // !O_CLOEXEC
|
|
if (pipe(pfd) == -1) {
|
|
return -1;
|
|
}
|
|
util::make_socket_closeonexec(pfd[0]);
|
|
util::make_socket_closeonexec(pfd[1]);
|
|
#endif // !O_CLOEXEC
|
|
|
|
auto closer = defer([&pfd]() {
|
|
if (pfd[0] != -1) {
|
|
close(pfd[0]);
|
|
}
|
|
|
|
if (pfd[1] != -1) {
|
|
close(pfd[1]);
|
|
}
|
|
});
|
|
|
|
sigset_t oldset;
|
|
|
|
rv = shrpx_signal_block_all(&oldset);
|
|
if (rv != 0) {
|
|
auto error = errno;
|
|
LOG(ERROR) << "Blocking all signals failed: errno=" << error;
|
|
|
|
return -1;
|
|
}
|
|
|
|
auto pid = fork();
|
|
|
|
if (pid == 0) {
|
|
// This is multithreaded program, and we are allowed to use only
|
|
// async-signal-safe functions here.
|
|
|
|
// child process
|
|
shrpx_signal_unset_worker_proc_ign_handler();
|
|
|
|
rv = shrpx_signal_unblock_all();
|
|
if (rv != 0) {
|
|
static constexpr char msg[] = "Unblocking all signals failed\n";
|
|
while (write(STDERR_FILENO, msg, str_size(msg)) == -1 && errno == EINTR)
|
|
;
|
|
nghttp2_Exit(EXIT_FAILURE);
|
|
}
|
|
|
|
dup2(pfd[1], 1);
|
|
close(pfd[0]);
|
|
|
|
rv = execv(argv[0], argv);
|
|
if (rv == -1) {
|
|
static constexpr char msg[] = "Could not execute command\n";
|
|
while (write(STDERR_FILENO, msg, str_size(msg)) == -1 && errno == EINTR)
|
|
;
|
|
nghttp2_Exit(EXIT_FAILURE);
|
|
}
|
|
// unreachable
|
|
}
|
|
|
|
// parent process
|
|
if (pid == -1) {
|
|
auto error = errno;
|
|
LOG(ERROR) << "Could not execute command: " << argv[0]
|
|
<< ", fork() failed, errno=" << error;
|
|
}
|
|
|
|
rv = shrpx_signal_set(&oldset);
|
|
if (rv != 0) {
|
|
auto error = errno;
|
|
LOG(FATAL) << "Restoring all signals failed: errno=" << error;
|
|
|
|
nghttp2_Exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (pid == -1) {
|
|
return -1;
|
|
}
|
|
|
|
close(pfd[1]);
|
|
pfd[1] = -1;
|
|
|
|
util::make_socket_nonblocking(pfd[0]);
|
|
|
|
proc.pid = pid;
|
|
proc.rfd = pfd[0];
|
|
|
|
pfd[0] = -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
} // namespace shrpx
|