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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
89711996 ZJS |
2 | |
3 | #include <dirent.h> | |
4 | #include <errno.h> | |
5 | #include <sys/prctl.h> | |
6 | #include <sys/types.h> | |
7 | #include <unistd.h> | |
c6e47247 | 8 | #include <stdio.h> |
89711996 ZJS |
9 | |
10 | #include "alloc-util.h" | |
2e4cfe65 | 11 | #include "conf-files.h" |
686d13b9 | 12 | #include "env-file.h" |
c6e47247 | 13 | #include "env-util.h" |
3f51bbff | 14 | #include "errno-util.h" |
89711996 | 15 | #include "exec-util.h" |
c6e47247 ZJS |
16 | #include "fd-util.h" |
17 | #include "fileio.h" | |
89711996 ZJS |
18 | #include "hashmap.h" |
19 | #include "macro.h" | |
8939eeae | 20 | #include "missing_syscall.h" |
89711996 | 21 | #include "process-util.h" |
595225af | 22 | #include "rlimit-util.h" |
d68c645b | 23 | #include "serialize.h" |
89711996 ZJS |
24 | #include "set.h" |
25 | #include "signal-util.h" | |
26 | #include "stat-util.h" | |
b3d59367 | 27 | #include "string-table.h" |
89711996 ZJS |
28 | #include "string-util.h" |
29 | #include "strv.h" | |
c6e47247 | 30 | #include "terminal-util.h" |
e4de7287 | 31 | #include "tmpfile-util.h" |
89711996 ZJS |
32 | #include "util.h" |
33 | ||
34 | /* Put this test here for a lack of better place */ | |
35 | assert_cc(EAGAIN == EWOULDBLOCK); | |
36 | ||
43f565c6 | 37 | static int do_spawn(const char *path, char *argv[], int stdout_fd, pid_t *pid, bool set_systemd_exec_pid) { |
cf55fc18 | 38 | pid_t _pid; |
4c253ed1 | 39 | int r; |
cf55fc18 ZJS |
40 | |
41 | if (null_or_empty_path(path)) { | |
42 | log_debug("%s is empty (a mask).", path); | |
43 | return 0; | |
44 | } | |
45 | ||
b6e1fff1 | 46 | r = safe_fork("(direxec)", FORK_DEATHSIG|FORK_LOG, &_pid); |
4c253ed1 | 47 | if (r < 0) |
b6e1fff1 | 48 | return r; |
4c253ed1 | 49 | if (r == 0) { |
cf55fc18 ZJS |
50 | char *_argv[2]; |
51 | ||
c6e47247 | 52 | if (stdout_fd >= 0) { |
aedec452 | 53 | r = rearrange_stdio(STDIN_FILENO, TAKE_FD(stdout_fd), STDERR_FILENO); |
2b33ab09 | 54 | if (r < 0) |
3554ef51 | 55 | _exit(EXIT_FAILURE); |
c6e47247 ZJS |
56 | } |
57 | ||
595225af LP |
58 | (void) rlimit_nofile_safe(); |
59 | ||
43f565c6 YW |
60 | if (set_systemd_exec_pid) { |
61 | r = setenv_systemd_exec_pid(false); | |
62 | if (r < 0) | |
63 | log_warning_errno(r, "Failed to set $SYSTEMD_EXEC_PID, ignoring: %m"); | |
64 | } | |
65 | ||
cf55fc18 ZJS |
66 | if (!argv) { |
67 | _argv[0] = (char*) path; | |
68 | _argv[1] = NULL; | |
69 | argv = _argv; | |
70 | } else | |
71 | argv[0] = (char*) path; | |
72 | ||
73 | execv(path, argv); | |
74 | log_error_errno(errno, "Failed to execute %s: %m", path); | |
75 | _exit(EXIT_FAILURE); | |
76 | } | |
77 | ||
cf55fc18 ZJS |
78 | *pid = _pid; |
79 | return 1; | |
80 | } | |
81 | ||
c6e47247 ZJS |
82 | static int do_execute( |
83 | char **directories, | |
84 | usec_t timeout, | |
85 | gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX], | |
86 | void* const callback_args[_STDOUT_CONSUME_MAX], | |
87 | int output_fd, | |
78ec1bb4 | 88 | char *argv[], |
4b05f0c9 MK |
89 | char *envp[], |
90 | ExecDirFlags flags) { | |
c6e47247 | 91 | |
89711996 | 92 | _cleanup_hashmap_free_free_ Hashmap *pids = NULL; |
2e4cfe65 | 93 | _cleanup_strv_free_ char **paths = NULL; |
2e4cfe65 | 94 | int r; |
4b05f0c9 | 95 | bool parallel_execution; |
89711996 | 96 | |
c6e47247 ZJS |
97 | /* We fork this all off from a child process so that we can somewhat cleanly make |
98 | * use of SIGALRM to set a time limit. | |
99 | * | |
4b05f0c9 MK |
100 | * We attempt to perform parallel execution if configured by the user, however |
101 | * if `callbacks` is nonnull, execution must be serial. | |
c6e47247 | 102 | */ |
4b05f0c9 | 103 | parallel_execution = FLAGS_SET(flags, EXEC_DIR_PARALLEL) && !callbacks; |
89711996 | 104 | |
3e36211b | 105 | r = conf_files_list_strv(&paths, NULL, NULL, CONF_FILES_EXECUTABLE|CONF_FILES_REGULAR|CONF_FILES_FILTER_MASKED, (const char* const*) directories); |
2e4cfe65 | 106 | if (r < 0) |
653d4695 | 107 | return log_error_errno(r, "Failed to enumerate executables: %m"); |
2e4cfe65 | 108 | |
4b05f0c9 | 109 | if (parallel_execution) { |
c6e47247 ZJS |
110 | pids = hashmap_new(NULL); |
111 | if (!pids) | |
112 | return log_oom(); | |
113 | } | |
114 | ||
5238e957 | 115 | /* Abort execution of this process after the timeout. We simply rely on SIGALRM as |
c6e47247 ZJS |
116 | * default action terminating the process, and turn on alarm(). */ |
117 | ||
118 | if (timeout != USEC_INFINITY) | |
be6b0c21 | 119 | alarm(DIV_ROUND_UP(timeout, USEC_PER_SEC)); |
89711996 | 120 | |
78ec1bb4 | 121 | STRV_FOREACH(e, envp) |
8f7329ac | 122 | if (putenv(*e) != 0) |
ed689f78 | 123 | return log_error_errno(errno, "Failed to set environment variable: %m"); |
78ec1bb4 | 124 | |
2e4cfe65 ZJS |
125 | STRV_FOREACH(path, paths) { |
126 | _cleanup_free_ char *t = NULL; | |
c6e47247 | 127 | _cleanup_close_ int fd = -1; |
2e4cfe65 | 128 | pid_t pid; |
89711996 | 129 | |
2e4cfe65 ZJS |
130 | t = strdup(*path); |
131 | if (!t) | |
132 | return log_oom(); | |
89711996 | 133 | |
c6e47247 ZJS |
134 | if (callbacks) { |
135 | fd = open_serialization_fd(basename(*path)); | |
136 | if (fd < 0) | |
137 | return log_error_errno(fd, "Failed to open serialization file: %m"); | |
138 | } | |
139 | ||
43f565c6 | 140 | r = do_spawn(t, argv, fd, &pid, FLAGS_SET(flags, EXEC_DIR_SET_SYSTEMD_EXEC_PID)); |
2e4cfe65 ZJS |
141 | if (r <= 0) |
142 | continue; | |
89711996 | 143 | |
4b05f0c9 | 144 | if (parallel_execution) { |
c6e47247 ZJS |
145 | r = hashmap_put(pids, PID_TO_PTR(pid), t); |
146 | if (r < 0) | |
147 | return log_oom(); | |
148 | t = NULL; | |
149 | } else { | |
7d4904fe | 150 | r = wait_for_terminate_and_check(t, pid, WAIT_LOG); |
4b05f0c9 MK |
151 | if (FLAGS_SET(flags, EXEC_DIR_IGNORE_ERRORS)) { |
152 | if (r < 0) | |
153 | continue; | |
154 | } else if (r > 0) | |
155 | return r; | |
156 | ||
157 | if (callbacks) { | |
158 | if (lseek(fd, 0, SEEK_SET) < 0) | |
159 | return log_error_errno(errno, "Failed to seek on serialization fd: %m"); | |
160 | ||
161 | r = callbacks[STDOUT_GENERATE](fd, callback_args[STDOUT_GENERATE]); | |
162 | fd = -1; | |
163 | if (r < 0) | |
164 | return log_error_errno(r, "Failed to process output from %s: %m", *path); | |
165 | } | |
c6e47247 | 166 | } |
89711996 ZJS |
167 | } |
168 | ||
c6e47247 ZJS |
169 | if (callbacks) { |
170 | r = callbacks[STDOUT_COLLECT](output_fd, callback_args[STDOUT_COLLECT]); | |
171 | if (r < 0) | |
172 | return log_error_errno(r, "Callback two failed: %m"); | |
173 | } | |
89711996 ZJS |
174 | |
175 | while (!hashmap_isempty(pids)) { | |
2e4cfe65 | 176 | _cleanup_free_ char *t = NULL; |
89711996 ZJS |
177 | pid_t pid; |
178 | ||
179 | pid = PTR_TO_PID(hashmap_first_key(pids)); | |
180 | assert(pid > 0); | |
181 | ||
2e4cfe65 ZJS |
182 | t = hashmap_remove(pids, PID_TO_PTR(pid)); |
183 | assert(t); | |
89711996 | 184 | |
4b05f0c9 MK |
185 | r = wait_for_terminate_and_check(t, pid, WAIT_LOG); |
186 | if (!FLAGS_SET(flags, EXEC_DIR_IGNORE_ERRORS) && r > 0) | |
187 | return r; | |
89711996 ZJS |
188 | } |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
c6e47247 ZJS |
193 | int execute_directories( |
194 | const char* const* directories, | |
195 | usec_t timeout, | |
196 | gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX], | |
197 | void* const callback_args[_STDOUT_CONSUME_MAX], | |
78ec1bb4 | 198 | char *argv[], |
4b05f0c9 MK |
199 | char *envp[], |
200 | ExecDirFlags flags) { | |
c6e47247 | 201 | |
89711996 | 202 | char **dirs = (char**) directories; |
c6e47247 | 203 | _cleanup_close_ int fd = -1; |
1f5d1e02 | 204 | char *name; |
c6e47247 | 205 | int r; |
4b05f0c9 | 206 | pid_t executor_pid; |
89711996 ZJS |
207 | |
208 | assert(!strv_isempty(dirs)); | |
209 | ||
210 | name = basename(dirs[0]); | |
211 | assert(!isempty(name)); | |
212 | ||
c6e47247 ZJS |
213 | if (callbacks) { |
214 | assert(callback_args); | |
215 | assert(callbacks[STDOUT_GENERATE]); | |
216 | assert(callbacks[STDOUT_COLLECT]); | |
217 | assert(callbacks[STDOUT_CONSUME]); | |
218 | ||
219 | fd = open_serialization_fd(name); | |
220 | if (fd < 0) | |
221 | return log_error_errno(fd, "Failed to open serialization file: %m"); | |
222 | } | |
223 | ||
224 | /* Executes all binaries in the directories serially or in parallel and waits for | |
225 | * them to finish. Optionally a timeout is applied. If a file with the same name | |
226 | * exists in more than one directory, the earliest one wins. */ | |
89711996 | 227 | |
4b05f0c9 | 228 | r = safe_fork("(sd-executor)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &executor_pid); |
4c253ed1 | 229 | if (r < 0) |
b6e1fff1 | 230 | return r; |
4c253ed1 | 231 | if (r == 0) { |
4b05f0c9 MK |
232 | r = do_execute(dirs, timeout, callbacks, callback_args, fd, argv, envp, flags); |
233 | _exit(r < 0 ? EXIT_FAILURE : r); | |
89711996 ZJS |
234 | } |
235 | ||
4b05f0c9 MK |
236 | r = wait_for_terminate_and_check("(sd-executor)", executor_pid, 0); |
237 | if (r < 0) | |
238 | return r; | |
239 | if (!FLAGS_SET(flags, EXEC_DIR_IGNORE_ERRORS) && r > 0) | |
240 | return r; | |
241 | ||
c6e47247 ZJS |
242 | if (!callbacks) |
243 | return 0; | |
244 | ||
245 | if (lseek(fd, 0, SEEK_SET) < 0) | |
246 | return log_error_errno(errno, "Failed to rewind serialization fd: %m"); | |
247 | ||
248 | r = callbacks[STDOUT_CONSUME](fd, callback_args[STDOUT_CONSUME]); | |
249 | fd = -1; | |
250 | if (r < 0) | |
251 | return log_error_errno(r, "Failed to parse returned data: %m"); | |
252 | return 0; | |
89711996 | 253 | } |
3303d1b2 ZJS |
254 | |
255 | static int gather_environment_generate(int fd, void *arg) { | |
de010b0b | 256 | char ***env = arg; |
3303d1b2 | 257 | _cleanup_fclose_ FILE *f = NULL; |
3f199740 | 258 | _cleanup_strv_free_ char **new = NULL; |
3303d1b2 ZJS |
259 | int r; |
260 | ||
261 | /* Read a series of VAR=value assignments from fd, use them to update the list of | |
262 | * variables in env. Also update the exported environment. | |
263 | * | |
264 | * fd is always consumed, even on error. | |
265 | */ | |
266 | ||
267 | assert(env); | |
268 | ||
269 | f = fdopen(fd, "r"); | |
270 | if (!f) { | |
271 | safe_close(fd); | |
272 | return -errno; | |
273 | } | |
274 | ||
aa8fbc74 | 275 | r = load_env_file_pairs(f, NULL, &new); |
3303d1b2 ZJS |
276 | if (r < 0) |
277 | return r; | |
278 | ||
279 | STRV_FOREACH_PAIR(x, y, new) { | |
184d1904 ZJS |
280 | if (!env_name_is_valid(*x)) { |
281 | log_warning("Invalid variable assignment \"%s=...\", ignoring.", *x); | |
282 | continue; | |
283 | } | |
284 | ||
b230baae | 285 | r = strv_env_assign(env, *x, *y); |
3303d1b2 ZJS |
286 | if (r < 0) |
287 | return r; | |
288 | ||
289 | if (setenv(*x, *y, true) < 0) | |
290 | return -errno; | |
291 | } | |
292 | ||
b230baae | 293 | return 0; |
3303d1b2 ZJS |
294 | } |
295 | ||
296 | static int gather_environment_collect(int fd, void *arg) { | |
3303d1b2 | 297 | _cleanup_fclose_ FILE *f = NULL; |
c93d527f | 298 | char ***env = arg; |
3303d1b2 ZJS |
299 | int r; |
300 | ||
301 | /* Write out a series of env=cescape(VAR=value) assignments to fd. */ | |
302 | ||
303 | assert(env); | |
304 | ||
305 | f = fdopen(fd, "w"); | |
306 | if (!f) { | |
307 | safe_close(fd); | |
308 | return -errno; | |
309 | } | |
310 | ||
d68c645b | 311 | r = serialize_strv(f, "env", *env); |
3303d1b2 ZJS |
312 | if (r < 0) |
313 | return r; | |
314 | ||
c93d527f LP |
315 | r = fflush_and_check(f); |
316 | if (r < 0) | |
317 | return r; | |
3303d1b2 ZJS |
318 | |
319 | return 0; | |
320 | } | |
321 | ||
322 | static int gather_environment_consume(int fd, void *arg) { | |
3303d1b2 | 323 | _cleanup_fclose_ FILE *f = NULL; |
d68c645b LP |
324 | char ***env = arg; |
325 | int r = 0; | |
3303d1b2 ZJS |
326 | |
327 | /* Read a series of env=cescape(VAR=value) assignments from fd into env. */ | |
328 | ||
329 | assert(env); | |
330 | ||
e92aaed3 | 331 | f = fdopen(fd, "r"); |
3303d1b2 ZJS |
332 | if (!f) { |
333 | safe_close(fd); | |
334 | return -errno; | |
335 | } | |
336 | ||
d68c645b LP |
337 | for (;;) { |
338 | _cleanup_free_ char *line = NULL; | |
339 | const char *v; | |
340 | int k; | |
3303d1b2 | 341 | |
d68c645b | 342 | k = read_line(f, LONG_LINE_MAX, &line); |
3303d1b2 | 343 | if (k < 0) |
d68c645b LP |
344 | return k; |
345 | if (k == 0) | |
346 | break; | |
347 | ||
348 | v = startswith(line, "env="); | |
349 | if (!v) { | |
350 | log_debug("Serialization line \"%s\" unexpectedly didn't start with \"env=\".", line); | |
351 | if (r == 0) | |
352 | r = -EINVAL; | |
353 | ||
354 | continue; | |
355 | } | |
356 | ||
357 | k = deserialize_environment(v, env); | |
358 | if (k < 0) { | |
359 | log_debug_errno(k, "Invalid serialization line \"%s\": %m", line); | |
360 | ||
361 | if (r == 0) | |
362 | r = k; | |
363 | } | |
3303d1b2 ZJS |
364 | } |
365 | ||
366 | return r; | |
367 | } | |
368 | ||
b3d59367 AZ |
369 | int exec_command_flags_from_strv(char **ex_opts, ExecCommandFlags *flags) { |
370 | ExecCommandFlags ex_flag, ret_flags = 0; | |
b3d59367 AZ |
371 | |
372 | assert(flags); | |
373 | ||
374 | STRV_FOREACH(opt, ex_opts) { | |
375 | ex_flag = exec_command_flags_from_string(*opt); | |
9de42a6a BR |
376 | if (ex_flag < 0) |
377 | return ex_flag; | |
378 | ret_flags |= ex_flag; | |
b3d59367 AZ |
379 | } |
380 | ||
381 | *flags = ret_flags; | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | int exec_command_flags_to_strv(ExecCommandFlags flags, char ***ex_opts) { | |
387 | _cleanup_strv_free_ char **ret_opts = NULL; | |
388 | ExecCommandFlags it = flags; | |
389 | const char *str; | |
390 | int i, r; | |
391 | ||
392 | assert(ex_opts); | |
393 | ||
9de42a6a BR |
394 | if (flags < 0) |
395 | return flags; | |
396 | ||
b3d59367 AZ |
397 | for (i = 0; it != 0; it &= ~(1 << i), i++) { |
398 | if (FLAGS_SET(flags, (1 << i))) { | |
399 | str = exec_command_flags_to_string(1 << i); | |
400 | if (!str) | |
401 | return -EINVAL; | |
402 | ||
403 | r = strv_extend(&ret_opts, str); | |
404 | if (r < 0) | |
405 | return r; | |
406 | } | |
407 | } | |
408 | ||
409 | *ex_opts = TAKE_PTR(ret_opts); | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
3303d1b2 ZJS |
414 | const gather_stdout_callback_t gather_environment[] = { |
415 | gather_environment_generate, | |
416 | gather_environment_collect, | |
417 | gather_environment_consume, | |
418 | }; | |
b3d59367 AZ |
419 | |
420 | static const char* const exec_command_strings[] = { | |
421 | "ignore-failure", /* EXEC_COMMAND_IGNORE_FAILURE */ | |
422 | "privileged", /* EXEC_COMMAND_FULLY_PRIVILEGED */ | |
423 | "no-setuid", /* EXEC_COMMAND_NO_SETUID */ | |
424 | "ambient", /* EXEC_COMMAND_AMBIENT_MAGIC */ | |
425 | "no-env-expand", /* EXEC_COMMAND_NO_ENV_EXPAND */ | |
426 | }; | |
427 | ||
428 | const char* exec_command_flags_to_string(ExecCommandFlags i) { | |
429 | size_t idx; | |
430 | ||
431 | for (idx = 0; idx < ELEMENTSOF(exec_command_strings); idx++) | |
432 | if (i == (1 << idx)) | |
433 | return exec_command_strings[idx]; | |
434 | ||
435 | return NULL; | |
436 | } | |
437 | ||
438 | ExecCommandFlags exec_command_flags_from_string(const char *s) { | |
439 | ssize_t idx; | |
440 | ||
441 | idx = string_table_lookup(exec_command_strings, ELEMENTSOF(exec_command_strings), s); | |
442 | ||
443 | if (idx < 0) | |
444 | return _EXEC_COMMAND_FLAGS_INVALID; | |
445 | else | |
446 | return 1 << idx; | |
447 | } | |
a6d9111c ZJS |
448 | |
449 | int fexecve_or_execve(int executable_fd, const char *executable, char *const argv[], char *const envp[]) { | |
69339ae9 LP |
450 | /* Refuse invalid fds, regardless if fexecve() use is enabled or not */ |
451 | if (executable_fd < 0) | |
452 | return -EBADF; | |
453 | ||
454 | /* Block any attempts on exploiting Linux' liberal argv[] handling, i.e. CVE-2021-4034 and suchlike */ | |
455 | if (isempty(executable) || strv_isempty(argv)) | |
456 | return -EINVAL; | |
457 | ||
ceedbf81 | 458 | #if ENABLE_FEXECVE |
69339ae9 | 459 | |
8939eeae | 460 | execveat(executable_fd, "", argv, envp, AT_EMPTY_PATH); |
3f51bbff ZJS |
461 | |
462 | if (IN_SET(errno, ENOSYS, ENOENT) || ERRNO_IS_PRIVILEGE(errno)) | |
463 | /* Old kernel or a script or an overzealous seccomp filter? Let's fall back to execve(). | |
a6d9111c ZJS |
464 | * |
465 | * fexecve(3): "If fd refers to a script (i.e., it is an executable text file that names a | |
466 | * script interpreter with a first line that begins with the characters #!) and the | |
467 | * close-on-exec flag has been set for fd, then fexecve() fails with the error ENOENT. This | |
468 | * error occurs because, by the time the script interpreter is executed, fd has already been | |
469 | * closed because of the close-on-exec flag. Thus, the close-on-exec flag can't be set on fd | |
470 | * if it refers to a script." | |
471 | * | |
472 | * Unfortunately, if we unset close-on-exec, the script will be executed just fine, but (at | |
473 | * least in case of bash) the script name, $0, will be shown as /dev/fd/nnn, which breaks | |
474 | * scripts which make use of $0. Thus, let's fall back to execve() in this case. | |
475 | */ | |
ceedbf81 | 476 | #endif |
a6d9111c ZJS |
477 | execve(executable, argv, envp); |
478 | return -errno; | |
479 | } | |
3e24e8cd | 480 | |
c85cb3bc | 481 | int fork_agent(const char *name, const int except[], size_t n_except, pid_t *ret_pid, const char *path, ...) { |
3e24e8cd ZJS |
482 | bool stdout_is_tty, stderr_is_tty; |
483 | size_t n, i; | |
484 | va_list ap; | |
485 | char **l; | |
486 | int r; | |
487 | ||
488 | assert(path); | |
489 | ||
490 | /* Spawns a temporary TTY agent, making sure it goes away when we go away */ | |
491 | ||
492 | r = safe_fork_full(name, | |
493 | except, | |
494 | n_except, | |
495 | FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_CLOSE_ALL_FDS|FORK_REOPEN_LOG, | |
496 | ret_pid); | |
497 | if (r < 0) | |
498 | return r; | |
499 | if (r > 0) | |
500 | return 0; | |
501 | ||
502 | /* In the child: */ | |
503 | ||
504 | stdout_is_tty = isatty(STDOUT_FILENO); | |
505 | stderr_is_tty = isatty(STDERR_FILENO); | |
506 | ||
507 | if (!stdout_is_tty || !stderr_is_tty) { | |
508 | int fd; | |
509 | ||
510 | /* Detach from stdout/stderr and reopen /dev/tty for them. This is important to ensure that | |
511 | * when systemctl is started via popen() or a similar call that expects to read EOF we | |
512 | * actually do generate EOF and not delay this indefinitely by keeping an unused copy of | |
513 | * stdin around. */ | |
514 | fd = open("/dev/tty", O_WRONLY); | |
515 | if (fd < 0) { | |
b98416e1 | 516 | if (errno != ENXIO) { |
0bcf1679 LP |
517 | log_error_errno(errno, "Failed to open /dev/tty: %m"); |
518 | _exit(EXIT_FAILURE); | |
519 | } | |
3e24e8cd | 520 | |
0bcf1679 LP |
521 | /* If we get ENXIO here we have no controlling TTY even though stdout/stderr are |
522 | * connected to a TTY. That's a weird setup, but let's handle it gracefully: let's | |
523 | * skip the forking of the agents, given the TTY setup is not in order. */ | |
524 | } else { | |
525 | if (!stdout_is_tty && dup2(fd, STDOUT_FILENO) < 0) { | |
526 | log_error_errno(errno, "Failed to dup2 /dev/tty: %m"); | |
527 | _exit(EXIT_FAILURE); | |
528 | } | |
3e24e8cd | 529 | |
0bcf1679 LP |
530 | if (!stderr_is_tty && dup2(fd, STDERR_FILENO) < 0) { |
531 | log_error_errno(errno, "Failed to dup2 /dev/tty: %m"); | |
532 | _exit(EXIT_FAILURE); | |
533 | } | |
3e24e8cd | 534 | |
0bcf1679 LP |
535 | fd = safe_close_above_stdio(fd); |
536 | } | |
3e24e8cd ZJS |
537 | } |
538 | ||
539 | (void) rlimit_nofile_safe(); | |
540 | ||
541 | /* Count arguments */ | |
542 | va_start(ap, path); | |
543 | for (n = 0; va_arg(ap, char*); n++) | |
544 | ; | |
545 | va_end(ap); | |
546 | ||
547 | /* Allocate strv */ | |
548 | l = newa(char*, n + 1); | |
549 | ||
550 | /* Fill in arguments */ | |
551 | va_start(ap, path); | |
552 | for (i = 0; i <= n; i++) | |
553 | l[i] = va_arg(ap, char*); | |
554 | va_end(ap); | |
555 | ||
556 | execv(path, l); | |
557 | _exit(EXIT_FAILURE); | |
558 | } |