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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
***/
#include <dirent.h>
#include <errno.h>
#include <sys/prctl.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include "alloc-util.h"
#include "conf-files.h"
#include "env-util.h"
#include "exec-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "hashmap.h"
#include "macro.h"
#include "process-util.h"
#include "set.h"
#include "signal-util.h"
#include "stat-util.h"
#include "string-util.h"
#include "strv.h"
#include "terminal-util.h"
#include "util.h"
/* Put this test here for a lack of better place */
assert_cc(EAGAIN == EWOULDBLOCK);
static int do_spawn(const char *path, char *argv[], int stdout_fd, pid_t *pid) {
pid_t _pid;
int r;
if (null_or_empty_path(path)) {
log_debug("%s is empty (a mask).", path);
return 0;
}
r = safe_fork("(direxec)", FORK_DEATHSIG|FORK_LOG, &_pid);
if (r < 0)
return r;
if (r == 0) {
char *_argv[2];
if (stdout_fd >= 0) {
r = rearrange_stdio(STDIN_FILENO, stdout_fd, STDERR_FILENO);
if (r < 0)
_exit(EXIT_FAILURE);
}
if (!argv) {
_argv[0] = (char*) path;
_argv[1] = NULL;
argv = _argv;
} else
argv[0] = (char*) path;
execv(path, argv);
log_error_errno(errno, "Failed to execute %s: %m", path);
_exit(EXIT_FAILURE);
}
*pid = _pid;
return 1;
}
static int do_execute(
char **directories,
usec_t timeout,
gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX],
void* const callback_args[_STDOUT_CONSUME_MAX],
int output_fd,
char *argv[]) {
_cleanup_hashmap_free_free_ Hashmap *pids = NULL;
_cleanup_strv_free_ char **paths = NULL;
char **path;
int r;
/* We fork this all off from a child process so that we can somewhat cleanly make
* use of SIGALRM to set a time limit.
*
* If callbacks is nonnull, execution is serial. Otherwise, we default to parallel.
*/
r = conf_files_list_strv(&paths, NULL, NULL, CONF_FILES_EXECUTABLE, (const char* const*) directories);
if (r < 0)
return r;
if (!callbacks) {
pids = hashmap_new(NULL);
if (!pids)
return log_oom();
}
/* Abort execution of this process after the timout. We simply rely on SIGALRM as
* default action terminating the process, and turn on alarm(). */
if (timeout != USEC_INFINITY)
alarm(DIV_ROUND_UP(timeout, USEC_PER_SEC));
STRV_FOREACH(path, paths) {
_cleanup_free_ char *t = NULL;
_cleanup_close_ int fd = -1;
pid_t pid;
t = strdup(*path);
if (!t)
return log_oom();
if (callbacks) {
fd = open_serialization_fd(basename(*path));
if (fd < 0)
return log_error_errno(fd, "Failed to open serialization file: %m");
}
r = do_spawn(t, argv, fd, &pid);
if (r <= 0)
continue;
if (pids) {
r = hashmap_put(pids, PID_TO_PTR(pid), t);
if (r < 0)
return log_oom();
t = NULL;
} else {
r = wait_for_terminate_and_check(t, pid, WAIT_LOG);
if (r < 0)
continue;
if (lseek(fd, 0, SEEK_SET) < 0)
return log_error_errno(errno, "Failed to seek on serialization fd: %m");
r = callbacks[STDOUT_GENERATE](fd, callback_args[STDOUT_GENERATE]);
fd = -1;
if (r < 0)
return log_error_errno(r, "Failed to process output from %s: %m", *path);
}
}
if (callbacks) {
r = callbacks[STDOUT_COLLECT](output_fd, callback_args[STDOUT_COLLECT]);
if (r < 0)
return log_error_errno(r, "Callback two failed: %m");
}
while (!hashmap_isempty(pids)) {
_cleanup_free_ char *t = NULL;
pid_t pid;
pid = PTR_TO_PID(hashmap_first_key(pids));
assert(pid > 0);
t = hashmap_remove(pids, PID_TO_PTR(pid));
assert(t);
(void) wait_for_terminate_and_check(t, pid, WAIT_LOG);
}
return 0;
}
int execute_directories(
const char* const* directories,
usec_t timeout,
gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX],
void* const callback_args[_STDOUT_CONSUME_MAX],
char *argv[]) {
char **dirs = (char**) directories;
_cleanup_close_ int fd = -1;
char *name;
int r;
assert(!strv_isempty(dirs));
name = basename(dirs[0]);
assert(!isempty(name));
if (callbacks) {
assert(callback_args);
assert(callbacks[STDOUT_GENERATE]);
assert(callbacks[STDOUT_COLLECT]);
assert(callbacks[STDOUT_CONSUME]);
fd = open_serialization_fd(name);
if (fd < 0)
return log_error_errno(fd, "Failed to open serialization file: %m");
}
/* Executes all binaries in the directories serially or in parallel and waits for
* them to finish. Optionally a timeout is applied. If a file with the same name
* exists in more than one directory, the earliest one wins. */
r = safe_fork("(sd-executor)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT, NULL);
if (r < 0)
return r;
if (r == 0) {
r = do_execute(dirs, timeout, callbacks, callback_args, fd, argv);
_exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
}
if (!callbacks)
return 0;
if (lseek(fd, 0, SEEK_SET) < 0)
return log_error_errno(errno, "Failed to rewind serialization fd: %m");
r = callbacks[STDOUT_CONSUME](fd, callback_args[STDOUT_CONSUME]);
fd = -1;
if (r < 0)
return log_error_errno(r, "Failed to parse returned data: %m");
return 0;
}
static int gather_environment_generate(int fd, void *arg) {
char ***env = arg, **x, **y;
_cleanup_fclose_ FILE *f = NULL;
_cleanup_strv_free_ char **new = NULL;
int r;
/* Read a series of VAR=value assignments from fd, use them to update the list of
* variables in env. Also update the exported environment.
*
* fd is always consumed, even on error.
*/
assert(env);
f = fdopen(fd, "r");
if (!f) {
safe_close(fd);
return -errno;
}
r = load_env_file_pairs(f, NULL, NULL, &new);
if (r < 0)
return r;
STRV_FOREACH_PAIR(x, y, new) {
char *p;
if (!env_name_is_valid(*x)) {
log_warning("Invalid variable assignment \"%s=...\", ignoring.", *x);
continue;
}
p = strjoin(*x, "=", *y);
if (!p)
return -ENOMEM;
r = strv_env_replace(env, p);
if (r < 0)
return r;
if (setenv(*x, *y, true) < 0)
return -errno;
}
return r;
}
static int gather_environment_collect(int fd, void *arg) {
char ***env = arg;
_cleanup_fclose_ FILE *f = NULL;
int r;
/* Write out a series of env=cescape(VAR=value) assignments to fd. */
assert(env);
f = fdopen(fd, "w");
if (!f) {
safe_close(fd);
return -errno;
}
r = serialize_environment(f, *env);
if (r < 0)
return r;
if (ferror(f))
return errno > 0 ? -errno : -EIO;
return 0;
}
static int gather_environment_consume(int fd, void *arg) {
char ***env = arg;
_cleanup_fclose_ FILE *f = NULL;
char line[LINE_MAX];
int r = 0, k;
/* Read a series of env=cescape(VAR=value) assignments from fd into env. */
assert(env);
f = fdopen(fd, "r");
if (!f) {
safe_close(fd);
return -errno;
}
FOREACH_LINE(line, f, return -EIO) {
truncate_nl(line);
k = deserialize_environment(env, line);
if (k < 0)
log_error_errno(k, "Invalid line \"%s\": %m", line);
if (k < 0 && r == 0)
r = k;
}
return r;
}
const gather_stdout_callback_t gather_environment[] = {
gather_environment_generate,
gather_environment_collect,
gather_environment_consume,
};
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