341 lines
10 KiB
C
341 lines
10 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <dirent.h>
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#include <errno.h>
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#include <sys/prctl.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdio.h>
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#include "alloc-util.h"
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#include "conf-files.h"
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#include "env-util.h"
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#include "exec-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "hashmap.h"
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#include "macro.h"
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#include "process-util.h"
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#include "set.h"
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#include "signal-util.h"
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#include "stat-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "terminal-util.h"
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#include "util.h"
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/* Put this test here for a lack of better place */
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assert_cc(EAGAIN == EWOULDBLOCK);
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static int do_spawn(const char *path, char *argv[], int stdout_fd, pid_t *pid) {
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pid_t _pid;
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int r;
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if (null_or_empty_path(path)) {
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log_debug("%s is empty (a mask).", path);
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return 0;
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}
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r = safe_fork("(direxec)", FORK_DEATHSIG|FORK_LOG, &_pid);
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if (r < 0)
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return r;
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if (r == 0) {
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char *_argv[2];
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if (stdout_fd >= 0) {
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r = rearrange_stdio(STDIN_FILENO, stdout_fd, STDERR_FILENO);
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if (r < 0)
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_exit(EXIT_FAILURE);
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}
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if (!argv) {
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_argv[0] = (char*) path;
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_argv[1] = NULL;
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argv = _argv;
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} else
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argv[0] = (char*) path;
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execv(path, argv);
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log_error_errno(errno, "Failed to execute %s: %m", path);
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_exit(EXIT_FAILURE);
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}
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*pid = _pid;
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return 1;
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}
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static int do_execute(
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char **directories,
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usec_t timeout,
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gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX],
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void* const callback_args[_STDOUT_CONSUME_MAX],
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int output_fd,
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char *argv[]) {
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_cleanup_hashmap_free_free_ Hashmap *pids = NULL;
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_cleanup_strv_free_ char **paths = NULL;
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char **path;
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int r;
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/* We fork this all off from a child process so that we can somewhat cleanly make
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* use of SIGALRM to set a time limit.
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*
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* If callbacks is nonnull, execution is serial. Otherwise, we default to parallel.
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*/
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r = conf_files_list_strv(&paths, NULL, NULL, CONF_FILES_EXECUTABLE, (const char* const*) directories);
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if (r < 0)
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return r;
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if (!callbacks) {
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pids = hashmap_new(NULL);
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if (!pids)
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return log_oom();
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}
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/* Abort execution of this process after the timout. We simply rely on SIGALRM as
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* default action terminating the process, and turn on alarm(). */
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if (timeout != USEC_INFINITY)
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alarm(DIV_ROUND_UP(timeout, USEC_PER_SEC));
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STRV_FOREACH(path, paths) {
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_cleanup_free_ char *t = NULL;
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_cleanup_close_ int fd = -1;
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pid_t pid;
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t = strdup(*path);
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if (!t)
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return log_oom();
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if (callbacks) {
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fd = open_serialization_fd(basename(*path));
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if (fd < 0)
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return log_error_errno(fd, "Failed to open serialization file: %m");
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}
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r = do_spawn(t, argv, fd, &pid);
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if (r <= 0)
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continue;
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if (pids) {
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r = hashmap_put(pids, PID_TO_PTR(pid), t);
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if (r < 0)
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return log_oom();
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t = NULL;
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} else {
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r = wait_for_terminate_and_check(t, pid, WAIT_LOG);
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if (r < 0)
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continue;
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if (lseek(fd, 0, SEEK_SET) < 0)
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return log_error_errno(errno, "Failed to seek on serialization fd: %m");
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r = callbacks[STDOUT_GENERATE](fd, callback_args[STDOUT_GENERATE]);
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fd = -1;
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if (r < 0)
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return log_error_errno(r, "Failed to process output from %s: %m", *path);
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}
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}
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if (callbacks) {
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r = callbacks[STDOUT_COLLECT](output_fd, callback_args[STDOUT_COLLECT]);
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if (r < 0)
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return log_error_errno(r, "Callback two failed: %m");
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}
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while (!hashmap_isempty(pids)) {
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_cleanup_free_ char *t = NULL;
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pid_t pid;
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pid = PTR_TO_PID(hashmap_first_key(pids));
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assert(pid > 0);
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t = hashmap_remove(pids, PID_TO_PTR(pid));
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assert(t);
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(void) wait_for_terminate_and_check(t, pid, WAIT_LOG);
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}
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return 0;
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}
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int execute_directories(
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const char* const* directories,
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usec_t timeout,
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gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX],
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void* const callback_args[_STDOUT_CONSUME_MAX],
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char *argv[]) {
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char **dirs = (char**) directories;
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_cleanup_close_ int fd = -1;
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char *name;
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int r;
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assert(!strv_isempty(dirs));
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name = basename(dirs[0]);
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assert(!isempty(name));
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if (callbacks) {
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assert(callback_args);
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assert(callbacks[STDOUT_GENERATE]);
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assert(callbacks[STDOUT_COLLECT]);
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assert(callbacks[STDOUT_CONSUME]);
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fd = open_serialization_fd(name);
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if (fd < 0)
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return log_error_errno(fd, "Failed to open serialization file: %m");
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}
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/* Executes all binaries in the directories serially or in parallel and waits for
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* them to finish. Optionally a timeout is applied. If a file with the same name
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* exists in more than one directory, the earliest one wins. */
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r = safe_fork("(sd-executor)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT, NULL);
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if (r < 0)
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return r;
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if (r == 0) {
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r = do_execute(dirs, timeout, callbacks, callback_args, fd, argv);
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_exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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if (!callbacks)
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return 0;
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if (lseek(fd, 0, SEEK_SET) < 0)
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return log_error_errno(errno, "Failed to rewind serialization fd: %m");
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r = callbacks[STDOUT_CONSUME](fd, callback_args[STDOUT_CONSUME]);
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fd = -1;
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if (r < 0)
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return log_error_errno(r, "Failed to parse returned data: %m");
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return 0;
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}
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static int gather_environment_generate(int fd, void *arg) {
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char ***env = arg, **x, **y;
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_cleanup_fclose_ FILE *f = NULL;
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_cleanup_strv_free_ char **new = NULL;
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int r;
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/* Read a series of VAR=value assignments from fd, use them to update the list of
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* variables in env. Also update the exported environment.
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*
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* fd is always consumed, even on error.
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*/
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assert(env);
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f = fdopen(fd, "r");
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if (!f) {
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safe_close(fd);
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return -errno;
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}
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r = load_env_file_pairs(f, NULL, NULL, &new);
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if (r < 0)
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return r;
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STRV_FOREACH_PAIR(x, y, new) {
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char *p;
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if (!env_name_is_valid(*x)) {
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log_warning("Invalid variable assignment \"%s=...\", ignoring.", *x);
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continue;
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}
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p = strjoin(*x, "=", *y);
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if (!p)
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return -ENOMEM;
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r = strv_env_replace(env, p);
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if (r < 0)
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return r;
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if (setenv(*x, *y, true) < 0)
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return -errno;
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}
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return r;
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}
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static int gather_environment_collect(int fd, void *arg) {
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char ***env = arg;
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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/* Write out a series of env=cescape(VAR=value) assignments to fd. */
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assert(env);
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f = fdopen(fd, "w");
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if (!f) {
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safe_close(fd);
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return -errno;
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}
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r = serialize_environment(f, *env);
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if (r < 0)
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return r;
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if (ferror(f))
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return errno > 0 ? -errno : -EIO;
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return 0;
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}
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static int gather_environment_consume(int fd, void *arg) {
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char ***env = arg;
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_cleanup_fclose_ FILE *f = NULL;
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char line[LINE_MAX];
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int r = 0, k;
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/* Read a series of env=cescape(VAR=value) assignments from fd into env. */
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assert(env);
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f = fdopen(fd, "r");
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if (!f) {
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safe_close(fd);
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return -errno;
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}
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FOREACH_LINE(line, f, return -EIO) {
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truncate_nl(line);
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k = deserialize_environment(env, line);
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if (k < 0)
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log_error_errno(k, "Invalid line \"%s\": %m", line);
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if (k < 0 && r == 0)
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r = k;
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}
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return r;
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}
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const gather_stdout_callback_t gather_environment[] = {
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gather_environment_generate,
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gather_environment_collect,
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gather_environment_consume,
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};
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