811 lines
16 KiB
C++
811 lines
16 KiB
C++
/*
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Copyright (C) 2010 Paul Davis
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Copyright 2005-2008 Lennart Poettering
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Author: Robin Gareus <robin@gareus.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <assert.h>
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#include <dirent.h>
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#ifdef __WIN32__
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#include <windows.h>
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#else
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#endif
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#include "system_exec.h"
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using namespace std;
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void * interposer_thread (void *arg);
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static void close_fd (int& fd) { if (fd >= 0) ::close (fd); fd = -1; }
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#ifndef __WIN32__
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/*
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* This function was part of libasyncns.
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* LGPL v2.1
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* Copyright 2005-2008 Lennart Poettering
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*/
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static int close_allv(const int except_fds[]) {
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struct rlimit rl;
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int fd;
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#ifdef __linux__
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DIR *d;
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assert(except_fds);
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if ((d = opendir("/proc/self/fd"))) {
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struct dirent *de;
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while ((de = readdir(d))) {
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int found;
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long l;
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char *e = NULL;
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int i;
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if (de->d_name[0] == '.')
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continue;
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errno = 0;
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l = strtol(de->d_name, &e, 10);
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if (errno != 0 || !e || *e) {
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closedir(d);
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errno = EINVAL;
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return -1;
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}
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fd = (int) l;
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if ((long) fd != l) {
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closedir(d);
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errno = EINVAL;
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return -1;
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}
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if (fd < 3)
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continue;
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if (fd == dirfd(d))
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continue;
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found = 0;
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for (i = 0; except_fds[i] >= 0; i++)
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if (except_fds[i] == fd) {
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found = 1;
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break;
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}
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if (found) continue;
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if (close(fd) < 0) {
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int saved_errno;
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saved_errno = errno;
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closedir(d);
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errno = saved_errno;
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return -1;
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}
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}
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closedir(d);
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return 0;
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}
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#endif
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if (getrlimit(RLIMIT_NOFILE, &rl) < 0)
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return -1;
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for (fd = 0; fd < (int) rl.rlim_max; fd++) {
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int i;
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if (fd <= 3)
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continue;
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for (i = 0; except_fds[i] >= 0; i++)
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if (except_fds[i] == fd)
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continue;
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if (close(fd) < 0 && errno != EBADF)
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return -1;
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}
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return 0;
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}
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#endif /* not on windows */
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SystemExec::SystemExec (std::string c, std::string a)
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: cmd(c)
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{
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pthread_mutex_init(&write_lock, NULL);
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thread_active=false;
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pid = 0;
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pin[1] = -1;
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nicelevel = 0;
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envp = NULL;
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argp = NULL;
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#ifdef __WIN32__
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stdinP[0] = stdinP[1] = INVALID_HANDLE_VALUE;
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stdoutP[0] = stdoutP[1] = INVALID_HANDLE_VALUE;
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stderrP[0] = stderrP[1] = INVALID_HANDLE_VALUE;
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#endif
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make_envp();
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make_argp(a);
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}
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SystemExec::SystemExec (std::string c, char **a)
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: cmd(c) , argp(a)
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{
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pthread_mutex_init(&write_lock, NULL);
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thread_active=false;
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pid = 0;
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pin[1] = -1;
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nicelevel = 0;
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envp = NULL;
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#ifdef __WIN32__
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stdinP[0] = stdinP[1] = INVALID_HANDLE_VALUE;
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stdoutP[0] = stdoutP[1] = INVALID_HANDLE_VALUE;
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stderrP[0] = stderrP[1] = INVALID_HANDLE_VALUE;
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make_wargs(a);
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#endif
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make_envp();
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}
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SystemExec::~SystemExec ()
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{
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terminate ();
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if (envp) {
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for (int i=0;envp[i];++i) {
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free(envp[i]);
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}
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free (envp);
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}
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if (argp) {
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for (int i=0;argp[i];++i) {
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free(argp[i]);
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}
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free (argp);
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}
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#ifdef __WIN32__
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if (w_args) free(w_args);
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#endif
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pthread_mutex_destroy(&write_lock);
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}
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void *
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interposer_thread (void *arg) {
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SystemExec *sex = static_cast<SystemExec *>(arg);
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sex->output_interposer();
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pthread_exit(0);
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return 0;
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}
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#ifdef __WIN32__ /* Windows Process */
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/* HELPER FUNCTIONS */
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static void create_pipe (HANDLE *pipe, bool in) {
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SECURITY_ATTRIBUTES secAtt = { sizeof( SECURITY_ATTRIBUTES ), NULL, TRUE };
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HANDLE tmpHandle;
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if (in) {
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if (!CreatePipe(&pipe[0], &tmpHandle, &secAtt, 1024 * 1024)) return;
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if (!DuplicateHandle(GetCurrentProcess(), tmpHandle, GetCurrentProcess(), &pipe[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) return;
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} else {
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if (!CreatePipe(&tmpHandle, &pipe[1], &secAtt, 1024 * 1024)) return;
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if (!DuplicateHandle(GetCurrentProcess(), tmpHandle, GetCurrentProcess(), &pipe[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) return;
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}
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CloseHandle(tmpHandle);
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}
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static void destroy_pipe (HANDLE pipe[2]) {
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if (pipe[0] != INVALID_HANDLE_VALUE) {
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CloseHandle(pipe[0]);
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pipe[0] = INVALID_HANDLE_VALUE;
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}
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if (pipe[1] != INVALID_HANDLE_VALUE) {
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CloseHandle(pipe[1]);
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pipe[1] = INVALID_HANDLE_VALUE;
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}
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}
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static BOOL CALLBACK my_terminateApp(HWND hwnd, LPARAM procId)
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{
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DWORD currentProcId = 0;
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GetWindowThreadProcessId(hwnd, ¤tProcId);
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if (currentProcId == (DWORD)procId)
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PostMessage(hwnd, WM_CLOSE, 0, 0);
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return TRUE;
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}
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/* PROCESS API */
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void
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SystemExec::make_envp() {
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;/* environemt is copied over with CreateProcess(...,env=0 ,..) */
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}
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void
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SystemExec::make_wargs(char **a) {
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std::string wa = cmd;
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if (cmd[0] != '"' && cmd[cmd.size()] != '"' && strchr(cmd.c_str(), ' ')) { wa = "\"" + cmd + "\""; }
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std::replace(cmd.begin(), cmd.end(), '/', '\\' );
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char **tmp = a;
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while (tmp && *tmp) {
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wa.append(" \"");
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wa.append(*tmp);
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wa.append("\"");
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tmp++;
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}
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w_args = strdup(wa.c_str());
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}
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void
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SystemExec::make_argp(std::string args) {
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std::string wa = cmd;
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if (cmd[0] != '"' && cmd[cmd.size()] != '"' && strchr(cmd.c_str(), ' ')) { wa = "\"" + cmd + "\""; }
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std::replace(cmd.begin(), cmd.end(), '/', '\\' );
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wa.append(" ");
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wa.append(args);
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w_args = strdup(wa.c_str());
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}
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void
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SystemExec::terminate ()
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{
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::pthread_mutex_lock(&write_lock);
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if (pid) {
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/* terminate */
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EnumWindows(my_terminateApp, (LPARAM)pid->dwProcessId);
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PostThreadMessage(pid->dwThreadId, WM_CLOSE, 0, 0);
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/* kill ! */
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TerminateProcess(pid->hProcess, 0xf291);
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CloseHandle(pid->hThread);
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CloseHandle(pid->hProcess);
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destroy_pipe(stdinP);
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destroy_pipe(stdoutP);
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destroy_pipe(stderrP);
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delete pid;
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pid=0;
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}
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::pthread_mutex_unlock(&write_lock);
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}
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int
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SystemExec::wait (int options)
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{
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while (is_running()) {
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WaitForSingleObject(pid->hProcess, INFINITE);
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Sleep(20);
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}
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return 0;
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}
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bool
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SystemExec::is_running ()
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{
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return pid?true:false;
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}
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int
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SystemExec::start (int stderr_mode)
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{
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char* working_dir = 0;
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if (pid) { return 0; }
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pid = new PROCESS_INFORMATION;
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memset(pid, 0, sizeof(PROCESS_INFORMATION));
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create_pipe(stdinP, true);
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create_pipe(stdoutP, false);
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if (stderr_mode == 2) {
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/* merge stout & stderr */
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DuplicateHandle(GetCurrentProcess(), stdoutP[1], GetCurrentProcess(), &stderrP[1], 0, TRUE, DUPLICATE_SAME_ACCESS);
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} else if (stderr_mode == 1) {
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//TODO read/flush this pipe or close it...
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create_pipe(stderrP, false);
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} else {
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//TODO: keep stderr of this process mode.
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}
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bool success = false;
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STARTUPINFOA startupInfo = { sizeof( STARTUPINFO ), 0, 0, 0,
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(unsigned long)CW_USEDEFAULT, (unsigned long)CW_USEDEFAULT,
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(unsigned long)CW_USEDEFAULT, (unsigned long)CW_USEDEFAULT,
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0, 0, 0,
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STARTF_USESTDHANDLES,
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0, 0, 0,
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stdinP[0], stdoutP[1], stderrP[1]
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};
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success = CreateProcess(0, w_args,
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0, 0, /* bInheritHandles = */ TRUE,
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(CREATE_NO_WINDOW&0) | CREATE_UNICODE_ENVIRONMENT | (0&CREATE_NEW_CONSOLE),
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/*env = */ 0,
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working_dir,
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&startupInfo, pid);
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if (stdinP[0] != INVALID_HANDLE_VALUE) {
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CloseHandle(stdinP[0]);
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stdinP[0] = INVALID_HANDLE_VALUE;
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}
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if (stdoutP[1] != INVALID_HANDLE_VALUE) {
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CloseHandle(stdoutP[1]);
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stdoutP[1] = INVALID_HANDLE_VALUE;
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}
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if (stderrP[1] != INVALID_HANDLE_VALUE) {
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CloseHandle(stderrP[1]);
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stderrP[1] = INVALID_HANDLE_VALUE;
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}
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if (!success) {
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CloseHandle(pid->hThread);
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CloseHandle(pid->hProcess);
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destroy_pipe(stdinP);
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destroy_pipe(stdoutP);
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destroy_pipe(stderrP);
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delete pid;
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pid=0;
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return -1;
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}
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int rv = pthread_create(&thread_id_tt, NULL, interposer_thread, this);
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thread_active=true;
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if (rv) {
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thread_active=false;
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terminate();
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return -2;
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}
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Sleep(20);
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return 0;
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}
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void
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SystemExec::output_interposer()
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{
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DWORD bytesRead = 0;
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char data[BUFSIZ];
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#if 0 // untested code to set up nonblocking
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unsigned long l = 1;
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ioctlsocket(stdoutP[0], FIONBIO, &l);
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#endif
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while(1) {
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#if 0 // for non-blocking pipes..
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DWORD bytesAvail = 0;
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PeekNamedPipe(stdoutP[0], 0, 0, 0, &bytesAvail, 0);
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if (bytesAvail < 1) {Sleep(500); printf("N/A\n"); continue;}
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#endif
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if (stdoutP[0] == INVALID_HANDLE_VALUE) break;
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if (!ReadFile(stdoutP[0], data, BUFSIZ, &bytesRead, 0)) break;
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if (bytesRead < 1) continue; /* actually not needed; but this is safe. */
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data[bytesRead] = 0;
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ReadStdout(data, bytesRead);/* EMIT SIGNAL */
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}
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Terminated();/* EMIT SIGNAL */
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}
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void
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SystemExec::close_stdin()
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{
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if (stdinP[0]!= INVALID_HANDLE_VALUE) FlushFileBuffers(stdinP[0]);
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if (stdinP[1]!= INVALID_HANDLE_VALUE) FlushFileBuffers(stdinP[1]);
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Sleep(200);
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destroy_pipe(stdinP);
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}
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int
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SystemExec::write_to_stdin(std::string d, size_t len)
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{
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const char *data;
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DWORD r,c;
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::pthread_mutex_lock(&write_lock);
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data=d.c_str();
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if (len == 0) {
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len=(d.length());
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}
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c=0;
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while (c < len) {
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if (!WriteFile(stdinP[1], data+c, len-c, &r, NULL)) {
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if (GetLastError() == 0xE8 /*NT_STATUS_INVALID_USER_BUFFER*/) {
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Sleep(100);
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continue;
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} else {
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fprintf(stderr, "SYSTEM-EXEC: stdin write error.\n");
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break;
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}
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}
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c += r;
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}
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::pthread_mutex_unlock(&write_lock);
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return c;
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}
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/* end windows process */
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#else
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/* UNIX/POSIX process */
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extern char **environ;
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void
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SystemExec::make_envp() {
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int i=0;
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envp = (char **) calloc(1, sizeof(char*));
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/* copy current environment */
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for (i=0;environ[i];++i) {
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envp[i] = strdup(environ[i]);
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envp = (char **) realloc(envp, (i+2) * sizeof(char*));
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}
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envp[i] = 0;
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}
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void
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SystemExec::make_argp(std::string args) {
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int argn = 1;
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char *cp1;
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char *cp2;
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char *carg = strdup(args.c_str());
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argp = (char **) malloc((argn + 1) * sizeof(char *));
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if (argp == (char **) 0) {
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free(carg);
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return; // FATAL
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}
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argp[0] = strdup(cmd.c_str());
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/* TODO: quotations and escapes
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* http://stackoverflow.com/questions/1511797/convert-string-to-argv-in-c
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*
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* It's actually not needed. All relevant invocations specify 'argp' directly.
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* Only 'xjadeo -L -R' uses this function and that uses neither quotations
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* nor arguments with white-space.
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*/
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for (cp1 = cp2 = carg; *cp2 != '\0'; ++cp2) {
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if (*cp2 == ' ') {
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*cp2 = '\0';
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argp[argn++] = strdup(cp1);
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cp1 = cp2 + 1;
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argp = (char **) realloc(argp, (argn + 1) * sizeof(char *));
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}
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}
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if (cp2 != cp1) {
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argp[argn++] = strdup(cp1);
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argp = (char **) realloc(argp, (argn + 1) * sizeof(char *));
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}
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argp[argn] = (char *) 0;
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free(carg);
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}
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void
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SystemExec::terminate ()
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{
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::pthread_mutex_lock(&write_lock);
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/* close stdin in an attempt to get the child to exit cleanly.
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*/
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close_stdin();
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if (pid) {
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::usleep(50000);
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sched_yield();
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wait(WNOHANG);
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}
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/* if pid is non-zero, the child task is still executing (i.e. it did
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* not exit in response to stdin being closed). try to kill it.
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*/
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if (pid) {
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::kill(pid, SIGTERM);
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::usleep(50000);
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sched_yield();
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wait(WNOHANG);
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}
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/* if pid is non-zero, the child task is STILL executing after being
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* sent SIGTERM. Act tough ... send SIGKILL
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*/
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if (pid) {
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::fprintf(stderr, "Process is still running! trying SIGKILL\n");
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::kill(pid, SIGKILL);
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}
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wait();
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if (thread_active) pthread_join(thread_id_tt, NULL);
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thread_active = false;
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::pthread_mutex_unlock(&write_lock);
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}
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|
|
|
int
|
|
SystemExec::wait (int options)
|
|
{
|
|
int status=0;
|
|
int ret;
|
|
|
|
if (pid==0) return -1;
|
|
|
|
ret = waitpid (pid, &status, options);
|
|
|
|
if (ret == pid) {
|
|
if (WEXITSTATUS(status) || WIFSIGNALED(status)) {
|
|
pid=0;
|
|
}
|
|
} else {
|
|
if (ret != 0) {
|
|
if (errno == ECHILD) {
|
|
/* no currently running children, reset pid */
|
|
pid=0;
|
|
}
|
|
} /* else the process is still running */
|
|
}
|
|
return status;
|
|
}
|
|
|
|
bool
|
|
SystemExec::is_running ()
|
|
{
|
|
int status=0;
|
|
if (pid==0) return false;
|
|
if (::waitpid(pid, &status, WNOHANG)==0) return true;
|
|
return false;
|
|
}
|
|
|
|
int
|
|
SystemExec::start (int stderr_mode)
|
|
{
|
|
if (is_running()) {
|
|
return 0; // mmh what to return here?
|
|
}
|
|
int r;
|
|
|
|
if (::pipe(pin) < 0 || ::pipe(pout) < 0 || ::pipe(pok) < 0) {
|
|
/* Something unexpected went wrong creating a pipe. */
|
|
return -1;
|
|
}
|
|
|
|
r = ::fork();
|
|
if (r < 0) {
|
|
/* failed to fork */
|
|
return -2;
|
|
}
|
|
|
|
if (r > 0) {
|
|
/* main */
|
|
pid=r;
|
|
|
|
/* check if execve was successful. */
|
|
close_fd(pok[1]);
|
|
char buf;
|
|
for ( ;; ) {
|
|
ssize_t n = ::read(pok[0], &buf, 1 );
|
|
if ( n==1 ) {
|
|
/* child process returned from execve */
|
|
pid=0;
|
|
close_fd(pok[0]);
|
|
close_fd(pin[1]);
|
|
close_fd(pin[0]);
|
|
close_fd(pout[1]);
|
|
close_fd(pout[0]);
|
|
pin[1] = -1;
|
|
return -3;
|
|
} else if ( n==-1 ) {
|
|
if ( errno==EAGAIN || errno==EINTR )
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
close_fd(pok[0]);
|
|
/* child started successfully */
|
|
|
|
#if 0
|
|
/* use fork for output-interposer
|
|
* it will run in a separated process
|
|
*/
|
|
/* catch stdout thread */
|
|
r = ::fork();
|
|
if (r < 0) {
|
|
// failed to fork
|
|
terminate();
|
|
return -2;
|
|
}
|
|
if (r == 0) {
|
|
/* 2nd child process - catch stdout */
|
|
close_fd(pin[1]);
|
|
close_fd(pout[1]);
|
|
output_interposer();
|
|
exit(0);
|
|
}
|
|
close_fd(pout[1]);
|
|
close_fd(pin[0]);
|
|
close_fd(pout[0]);
|
|
#else /* use pthread */
|
|
close_fd(pout[1]);
|
|
close_fd(pin[0]);
|
|
int rv = pthread_create(&thread_id_tt, NULL, interposer_thread, this);
|
|
|
|
thread_active=true;
|
|
if (rv) {
|
|
thread_active=false;
|
|
terminate();
|
|
return -2;
|
|
}
|
|
#endif
|
|
return 0; /* all systems go - return to main */
|
|
}
|
|
|
|
/* child process - exec external process */
|
|
close_fd(pok[0]);
|
|
::fcntl(pok[1], F_SETFD, FD_CLOEXEC);
|
|
|
|
close_fd(pin[1]);
|
|
if (pin[0] != STDIN_FILENO) {
|
|
::dup2(pin[0], STDIN_FILENO);
|
|
}
|
|
close_fd(pin[0]);
|
|
close_fd(pout[0]);
|
|
if (pout[1] != STDOUT_FILENO) {
|
|
::dup2(pout[1], STDOUT_FILENO);
|
|
}
|
|
|
|
if (stderr_mode == 2) {
|
|
/* merge STDERR into output */
|
|
if (pout[1] != STDERR_FILENO) {
|
|
::dup2(pout[1], STDERR_FILENO);
|
|
}
|
|
} else if (stderr_mode == 1) {
|
|
/* ignore STDERR */
|
|
::close(STDERR_FILENO);
|
|
} else {
|
|
/* keep STDERR */
|
|
}
|
|
|
|
if (pout[1] != STDOUT_FILENO && pout[1] != STDERR_FILENO) {
|
|
close_fd(pout[1]);
|
|
}
|
|
|
|
if (nicelevel !=0) {
|
|
::nice(nicelevel);
|
|
}
|
|
|
|
#if 0
|
|
/* chdir to executable dir */
|
|
char *directory;
|
|
directory = strdup(cmd.c_str());
|
|
if (strrchr(directory, '/') != (char *) 0) {
|
|
::chdir(directory);
|
|
}
|
|
free(directory);
|
|
#endif
|
|
|
|
#ifdef HAVE_SIGSET
|
|
sigset(SIGPIPE, SIG_DFL);
|
|
#else
|
|
signal(SIGPIPE, SIG_DFL);
|
|
#endif
|
|
|
|
#ifndef __WIN32__
|
|
int good_fds[1] = { 0 };
|
|
close_allv(good_fds);
|
|
#endif
|
|
|
|
::execve(argp[0], argp, envp);
|
|
/* if we reach here something went wrong.. */
|
|
char buf = 0;
|
|
(void) ::write(pok[1], &buf, 1 );
|
|
close_fd(pok[1]);
|
|
exit(-1);
|
|
return -1;
|
|
}
|
|
|
|
void
|
|
SystemExec::output_interposer()
|
|
{
|
|
int rfd=pout[0];
|
|
char buf[BUFSIZ];
|
|
ssize_t r;
|
|
unsigned long l = 1;
|
|
|
|
ioctl(rfd, FIONBIO, &l); // set non-blocking I/O
|
|
|
|
for (;fcntl(rfd, F_GETFL)!=-1;) {
|
|
r = read(rfd, buf, sizeof(buf));
|
|
if (r < 0 && (errno == EINTR || errno == EAGAIN)) {
|
|
::usleep(1000);
|
|
continue;
|
|
}
|
|
if (r <= 0) {
|
|
break;
|
|
}
|
|
buf[r]=0;
|
|
std::string rv = std::string(buf,r); // TODO: check allocation strategy
|
|
ReadStdout(rv, r);/* EMIT SIGNAL */
|
|
}
|
|
Terminated();/* EMIT SIGNAL */
|
|
}
|
|
|
|
void
|
|
SystemExec::close_stdin()
|
|
{
|
|
if (pin[1]<0) return;
|
|
close_fd(pin[0]);
|
|
close_fd(pin[1]);
|
|
close_fd(pout[0]);
|
|
close_fd(pout[1]);
|
|
}
|
|
|
|
int
|
|
SystemExec::write_to_stdin(std::string d, size_t len)
|
|
{
|
|
const char *data;
|
|
ssize_t r;
|
|
size_t c;
|
|
::pthread_mutex_lock(&write_lock);
|
|
|
|
data=d.c_str();
|
|
if (len == 0) {
|
|
len=(d.length());
|
|
}
|
|
c=0;
|
|
while (c < len) {
|
|
for (;;) {
|
|
r=::write(pin[1], data+c, len-c);
|
|
if (r < 0 && (errno == EINTR || errno == EAGAIN)) {
|
|
sleep(1);
|
|
continue;
|
|
}
|
|
if ((size_t) r != (len-c)) {
|
|
::pthread_mutex_unlock(&write_lock);
|
|
return c;
|
|
}
|
|
break;
|
|
}
|
|
c += r;
|
|
}
|
|
fsync(pin[1]);
|
|
::pthread_mutex_unlock(&write_lock);
|
|
return c;
|
|
}
|
|
|
|
#endif // end UNIX process
|