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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" |
03469b77 | 21 | #include "path-util.h" |
89711996 | 22 | #include "process-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 | |
33 | /* Put this test here for a lack of better place */ | |
34 | assert_cc(EAGAIN == EWOULDBLOCK); | |
35 | ||
43f565c6 | 36 | static int do_spawn(const char *path, char *argv[], int stdout_fd, pid_t *pid, bool set_systemd_exec_pid) { |
cf55fc18 | 37 | pid_t _pid; |
4c253ed1 | 38 | int r; |
cf55fc18 ZJS |
39 | |
40 | if (null_or_empty_path(path)) { | |
41 | log_debug("%s is empty (a mask).", path); | |
42 | return 0; | |
43 | } | |
44 | ||
f3f2d02e | 45 | r = safe_fork("(direxec)", FORK_DEATHSIG|FORK_LOG|FORK_RLIMIT_NOFILE_SAFE, &_pid); |
4c253ed1 | 46 | if (r < 0) |
b6e1fff1 | 47 | return r; |
4c253ed1 | 48 | if (r == 0) { |
cf55fc18 ZJS |
49 | char *_argv[2]; |
50 | ||
c6e47247 | 51 | if (stdout_fd >= 0) { |
aedec452 | 52 | r = rearrange_stdio(STDIN_FILENO, TAKE_FD(stdout_fd), STDERR_FILENO); |
2b33ab09 | 53 | if (r < 0) |
3554ef51 | 54 | _exit(EXIT_FAILURE); |
c6e47247 ZJS |
55 | } |
56 | ||
43f565c6 YW |
57 | if (set_systemd_exec_pid) { |
58 | r = setenv_systemd_exec_pid(false); | |
59 | if (r < 0) | |
60 | log_warning_errno(r, "Failed to set $SYSTEMD_EXEC_PID, ignoring: %m"); | |
61 | } | |
62 | ||
cf55fc18 ZJS |
63 | if (!argv) { |
64 | _argv[0] = (char*) path; | |
65 | _argv[1] = NULL; | |
66 | argv = _argv; | |
67 | } else | |
68 | argv[0] = (char*) path; | |
69 | ||
70 | execv(path, argv); | |
71 | log_error_errno(errno, "Failed to execute %s: %m", path); | |
72 | _exit(EXIT_FAILURE); | |
73 | } | |
74 | ||
cf55fc18 ZJS |
75 | *pid = _pid; |
76 | return 1; | |
77 | } | |
78 | ||
c6e47247 ZJS |
79 | static int do_execute( |
80 | char **directories, | |
81 | usec_t timeout, | |
82 | gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX], | |
83 | void* const callback_args[_STDOUT_CONSUME_MAX], | |
84 | int output_fd, | |
78ec1bb4 | 85 | char *argv[], |
4b05f0c9 MK |
86 | char *envp[], |
87 | ExecDirFlags flags) { | |
c6e47247 | 88 | |
89711996 | 89 | _cleanup_hashmap_free_free_ Hashmap *pids = NULL; |
2e4cfe65 | 90 | _cleanup_strv_free_ char **paths = NULL; |
2e4cfe65 | 91 | int r; |
4b05f0c9 | 92 | bool parallel_execution; |
89711996 | 93 | |
c6e47247 ZJS |
94 | /* We fork this all off from a child process so that we can somewhat cleanly make |
95 | * use of SIGALRM to set a time limit. | |
96 | * | |
4b05f0c9 MK |
97 | * We attempt to perform parallel execution if configured by the user, however |
98 | * if `callbacks` is nonnull, execution must be serial. | |
c6e47247 | 99 | */ |
4b05f0c9 | 100 | parallel_execution = FLAGS_SET(flags, EXEC_DIR_PARALLEL) && !callbacks; |
89711996 | 101 | |
3e36211b | 102 | r = conf_files_list_strv(&paths, NULL, NULL, CONF_FILES_EXECUTABLE|CONF_FILES_REGULAR|CONF_FILES_FILTER_MASKED, (const char* const*) directories); |
2e4cfe65 | 103 | if (r < 0) |
653d4695 | 104 | return log_error_errno(r, "Failed to enumerate executables: %m"); |
2e4cfe65 | 105 | |
4b05f0c9 | 106 | if (parallel_execution) { |
c6e47247 ZJS |
107 | pids = hashmap_new(NULL); |
108 | if (!pids) | |
109 | return log_oom(); | |
110 | } | |
111 | ||
5238e957 | 112 | /* Abort execution of this process after the timeout. We simply rely on SIGALRM as |
c6e47247 ZJS |
113 | * default action terminating the process, and turn on alarm(). */ |
114 | ||
115 | if (timeout != USEC_INFINITY) | |
be6b0c21 | 116 | alarm(DIV_ROUND_UP(timeout, USEC_PER_SEC)); |
89711996 | 117 | |
78ec1bb4 | 118 | STRV_FOREACH(e, envp) |
8f7329ac | 119 | if (putenv(*e) != 0) |
ed689f78 | 120 | return log_error_errno(errno, "Failed to set environment variable: %m"); |
78ec1bb4 | 121 | |
2e4cfe65 ZJS |
122 | STRV_FOREACH(path, paths) { |
123 | _cleanup_free_ char *t = NULL; | |
254d1313 | 124 | _cleanup_close_ int fd = -EBADF; |
2e4cfe65 | 125 | pid_t pid; |
89711996 | 126 | |
2e4cfe65 ZJS |
127 | t = strdup(*path); |
128 | if (!t) | |
129 | return log_oom(); | |
89711996 | 130 | |
c6e47247 | 131 | if (callbacks) { |
03469b77 LP |
132 | _cleanup_free_ char *bn = NULL; |
133 | ||
134 | r = path_extract_filename(*path, &bn); | |
135 | if (r < 0) | |
136 | return log_error_errno(r, "Failed to extract filename from path '%s': %m", *path); | |
137 | ||
138 | fd = open_serialization_fd(bn); | |
c6e47247 ZJS |
139 | if (fd < 0) |
140 | return log_error_errno(fd, "Failed to open serialization file: %m"); | |
141 | } | |
142 | ||
43f565c6 | 143 | r = do_spawn(t, argv, fd, &pid, FLAGS_SET(flags, EXEC_DIR_SET_SYSTEMD_EXEC_PID)); |
2e4cfe65 ZJS |
144 | if (r <= 0) |
145 | continue; | |
89711996 | 146 | |
4b05f0c9 | 147 | if (parallel_execution) { |
c6e47247 ZJS |
148 | r = hashmap_put(pids, PID_TO_PTR(pid), t); |
149 | if (r < 0) | |
150 | return log_oom(); | |
151 | t = NULL; | |
152 | } else { | |
7d4904fe | 153 | r = wait_for_terminate_and_check(t, pid, WAIT_LOG); |
65cd9c72 YW |
154 | if (r < 0) |
155 | return r; | |
156 | if (!FLAGS_SET(flags, EXEC_DIR_IGNORE_ERRORS) && r > 0) | |
4b05f0c9 MK |
157 | return r; |
158 | ||
159 | if (callbacks) { | |
160 | if (lseek(fd, 0, SEEK_SET) < 0) | |
161 | return log_error_errno(errno, "Failed to seek on serialization fd: %m"); | |
162 | ||
ced30d69 | 163 | r = callbacks[STDOUT_GENERATE](TAKE_FD(fd), callback_args[STDOUT_GENERATE]); |
4b05f0c9 MK |
164 | if (r < 0) |
165 | return log_error_errno(r, "Failed to process output from %s: %m", *path); | |
166 | } | |
c6e47247 | 167 | } |
89711996 ZJS |
168 | } |
169 | ||
c6e47247 ZJS |
170 | if (callbacks) { |
171 | r = callbacks[STDOUT_COLLECT](output_fd, callback_args[STDOUT_COLLECT]); | |
172 | if (r < 0) | |
173 | return log_error_errno(r, "Callback two failed: %m"); | |
174 | } | |
89711996 ZJS |
175 | |
176 | while (!hashmap_isempty(pids)) { | |
2e4cfe65 | 177 | _cleanup_free_ char *t = NULL; |
89711996 ZJS |
178 | pid_t pid; |
179 | ||
180 | pid = PTR_TO_PID(hashmap_first_key(pids)); | |
181 | assert(pid > 0); | |
182 | ||
2e4cfe65 ZJS |
183 | t = hashmap_remove(pids, PID_TO_PTR(pid)); |
184 | assert(t); | |
89711996 | 185 | |
4b05f0c9 | 186 | r = wait_for_terminate_and_check(t, pid, WAIT_LOG); |
65cd9c72 YW |
187 | if (r < 0) |
188 | return r; | |
4b05f0c9 MK |
189 | if (!FLAGS_SET(flags, EXEC_DIR_IGNORE_ERRORS) && r > 0) |
190 | return r; | |
89711996 ZJS |
191 | } |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
c6e47247 ZJS |
196 | int execute_directories( |
197 | const char* const* directories, | |
198 | usec_t timeout, | |
199 | gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX], | |
200 | void* const callback_args[_STDOUT_CONSUME_MAX], | |
78ec1bb4 | 201 | char *argv[], |
4b05f0c9 MK |
202 | char *envp[], |
203 | ExecDirFlags flags) { | |
c6e47247 | 204 | |
89711996 | 205 | char **dirs = (char**) directories; |
254d1313 | 206 | _cleanup_close_ int fd = -EBADF; |
c6e47247 | 207 | int r; |
4b05f0c9 | 208 | pid_t executor_pid; |
89711996 ZJS |
209 | |
210 | assert(!strv_isempty(dirs)); | |
211 | ||
c6e47247 ZJS |
212 | if (callbacks) { |
213 | assert(callback_args); | |
214 | assert(callbacks[STDOUT_GENERATE]); | |
215 | assert(callbacks[STDOUT_COLLECT]); | |
216 | assert(callbacks[STDOUT_CONSUME]); | |
217 | ||
8e8df829 YW |
218 | _cleanup_free_ char *name = NULL; |
219 | ||
220 | r = path_extract_filename(dirs[0], &name); | |
221 | if (r < 0) | |
222 | return log_error_errno(r, "Failed to extract file name from '%s': %m", dirs[0]); | |
223 | ||
c6e47247 ZJS |
224 | fd = open_serialization_fd(name); |
225 | if (fd < 0) | |
226 | return log_error_errno(fd, "Failed to open serialization file: %m"); | |
227 | } | |
228 | ||
229 | /* Executes all binaries in the directories serially or in parallel and waits for | |
230 | * them to finish. Optionally a timeout is applied. If a file with the same name | |
231 | * exists in more than one directory, the earliest one wins. */ | |
89711996 | 232 | |
4b05f0c9 | 233 | r = safe_fork("(sd-executor)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &executor_pid); |
4c253ed1 | 234 | if (r < 0) |
b6e1fff1 | 235 | return r; |
4c253ed1 | 236 | if (r == 0) { |
4b05f0c9 MK |
237 | r = do_execute(dirs, timeout, callbacks, callback_args, fd, argv, envp, flags); |
238 | _exit(r < 0 ? EXIT_FAILURE : r); | |
89711996 ZJS |
239 | } |
240 | ||
4b05f0c9 MK |
241 | r = wait_for_terminate_and_check("(sd-executor)", executor_pid, 0); |
242 | if (r < 0) | |
243 | return r; | |
244 | if (!FLAGS_SET(flags, EXEC_DIR_IGNORE_ERRORS) && r > 0) | |
245 | return r; | |
246 | ||
c6e47247 ZJS |
247 | if (!callbacks) |
248 | return 0; | |
249 | ||
250 | if (lseek(fd, 0, SEEK_SET) < 0) | |
251 | return log_error_errno(errno, "Failed to rewind serialization fd: %m"); | |
252 | ||
ced30d69 | 253 | r = callbacks[STDOUT_CONSUME](TAKE_FD(fd), callback_args[STDOUT_CONSUME]); |
c6e47247 ZJS |
254 | if (r < 0) |
255 | return log_error_errno(r, "Failed to parse returned data: %m"); | |
256 | return 0; | |
89711996 | 257 | } |
3303d1b2 ZJS |
258 | |
259 | static int gather_environment_generate(int fd, void *arg) { | |
99534007 | 260 | char ***env = ASSERT_PTR(arg); |
3303d1b2 | 261 | _cleanup_fclose_ FILE *f = NULL; |
3f199740 | 262 | _cleanup_strv_free_ char **new = NULL; |
3303d1b2 ZJS |
263 | int r; |
264 | ||
265 | /* Read a series of VAR=value assignments from fd, use them to update the list of | |
266 | * variables in env. Also update the exported environment. | |
267 | * | |
268 | * fd is always consumed, even on error. | |
269 | */ | |
270 | ||
3303d1b2 ZJS |
271 | f = fdopen(fd, "r"); |
272 | if (!f) { | |
273 | safe_close(fd); | |
274 | return -errno; | |
275 | } | |
276 | ||
aa8fbc74 | 277 | r = load_env_file_pairs(f, NULL, &new); |
3303d1b2 ZJS |
278 | if (r < 0) |
279 | return r; | |
280 | ||
281 | STRV_FOREACH_PAIR(x, y, new) { | |
184d1904 ZJS |
282 | if (!env_name_is_valid(*x)) { |
283 | log_warning("Invalid variable assignment \"%s=...\", ignoring.", *x); | |
284 | continue; | |
285 | } | |
286 | ||
b230baae | 287 | r = strv_env_assign(env, *x, *y); |
3303d1b2 ZJS |
288 | if (r < 0) |
289 | return r; | |
290 | ||
291 | if (setenv(*x, *y, true) < 0) | |
292 | return -errno; | |
293 | } | |
294 | ||
b230baae | 295 | return 0; |
3303d1b2 ZJS |
296 | } |
297 | ||
298 | static int gather_environment_collect(int fd, void *arg) { | |
3303d1b2 | 299 | _cleanup_fclose_ FILE *f = NULL; |
99534007 | 300 | char ***env = ASSERT_PTR(arg); |
3303d1b2 ZJS |
301 | int r; |
302 | ||
303 | /* Write out a series of env=cescape(VAR=value) assignments to fd. */ | |
304 | ||
3303d1b2 ZJS |
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; |
99534007 | 324 | char ***env = ASSERT_PTR(arg); |
d68c645b | 325 | int r = 0; |
3303d1b2 ZJS |
326 | |
327 | /* Read a series of env=cescape(VAR=value) assignments from fd into env. */ | |
328 | ||
e92aaed3 | 329 | f = fdopen(fd, "r"); |
3303d1b2 ZJS |
330 | if (!f) { |
331 | safe_close(fd); | |
332 | return -errno; | |
333 | } | |
334 | ||
d68c645b LP |
335 | for (;;) { |
336 | _cleanup_free_ char *line = NULL; | |
337 | const char *v; | |
338 | int k; | |
3303d1b2 | 339 | |
d68c645b | 340 | k = read_line(f, LONG_LINE_MAX, &line); |
3303d1b2 | 341 | if (k < 0) |
d68c645b LP |
342 | return k; |
343 | if (k == 0) | |
344 | break; | |
345 | ||
346 | v = startswith(line, "env="); | |
347 | if (!v) { | |
348 | log_debug("Serialization line \"%s\" unexpectedly didn't start with \"env=\".", line); | |
349 | if (r == 0) | |
350 | r = -EINVAL; | |
351 | ||
352 | continue; | |
353 | } | |
354 | ||
355 | k = deserialize_environment(v, env); | |
356 | if (k < 0) { | |
357 | log_debug_errno(k, "Invalid serialization line \"%s\": %m", line); | |
358 | ||
359 | if (r == 0) | |
360 | r = k; | |
361 | } | |
3303d1b2 ZJS |
362 | } |
363 | ||
364 | return r; | |
365 | } | |
366 | ||
b3d59367 AZ |
367 | int exec_command_flags_from_strv(char **ex_opts, ExecCommandFlags *flags) { |
368 | ExecCommandFlags ex_flag, ret_flags = 0; | |
b3d59367 AZ |
369 | |
370 | assert(flags); | |
371 | ||
372 | STRV_FOREACH(opt, ex_opts) { | |
373 | ex_flag = exec_command_flags_from_string(*opt); | |
9de42a6a BR |
374 | if (ex_flag < 0) |
375 | return ex_flag; | |
376 | ret_flags |= ex_flag; | |
b3d59367 AZ |
377 | } |
378 | ||
379 | *flags = ret_flags; | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | int exec_command_flags_to_strv(ExecCommandFlags flags, char ***ex_opts) { | |
385 | _cleanup_strv_free_ char **ret_opts = NULL; | |
386 | ExecCommandFlags it = flags; | |
387 | const char *str; | |
388 | int i, r; | |
389 | ||
390 | assert(ex_opts); | |
391 | ||
9de42a6a BR |
392 | if (flags < 0) |
393 | return flags; | |
394 | ||
b3d59367 AZ |
395 | for (i = 0; it != 0; it &= ~(1 << i), i++) { |
396 | if (FLAGS_SET(flags, (1 << i))) { | |
397 | str = exec_command_flags_to_string(1 << i); | |
398 | if (!str) | |
399 | return -EINVAL; | |
400 | ||
401 | r = strv_extend(&ret_opts, str); | |
402 | if (r < 0) | |
403 | return r; | |
404 | } | |
405 | } | |
406 | ||
407 | *ex_opts = TAKE_PTR(ret_opts); | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
3303d1b2 ZJS |
412 | const gather_stdout_callback_t gather_environment[] = { |
413 | gather_environment_generate, | |
414 | gather_environment_collect, | |
415 | gather_environment_consume, | |
416 | }; | |
b3d59367 AZ |
417 | |
418 | static const char* const exec_command_strings[] = { | |
419 | "ignore-failure", /* EXEC_COMMAND_IGNORE_FAILURE */ | |
420 | "privileged", /* EXEC_COMMAND_FULLY_PRIVILEGED */ | |
421 | "no-setuid", /* EXEC_COMMAND_NO_SETUID */ | |
422 | "ambient", /* EXEC_COMMAND_AMBIENT_MAGIC */ | |
423 | "no-env-expand", /* EXEC_COMMAND_NO_ENV_EXPAND */ | |
424 | }; | |
425 | ||
426 | const char* exec_command_flags_to_string(ExecCommandFlags i) { | |
427 | size_t idx; | |
428 | ||
429 | for (idx = 0; idx < ELEMENTSOF(exec_command_strings); idx++) | |
430 | if (i == (1 << idx)) | |
431 | return exec_command_strings[idx]; | |
432 | ||
433 | return NULL; | |
434 | } | |
435 | ||
436 | ExecCommandFlags exec_command_flags_from_string(const char *s) { | |
437 | ssize_t idx; | |
438 | ||
439 | idx = string_table_lookup(exec_command_strings, ELEMENTSOF(exec_command_strings), s); | |
440 | ||
441 | if (idx < 0) | |
442 | return _EXEC_COMMAND_FLAGS_INVALID; | |
443 | else | |
444 | return 1 << idx; | |
445 | } | |
a6d9111c ZJS |
446 | |
447 | int fexecve_or_execve(int executable_fd, const char *executable, char *const argv[], char *const envp[]) { | |
69339ae9 LP |
448 | /* Refuse invalid fds, regardless if fexecve() use is enabled or not */ |
449 | if (executable_fd < 0) | |
450 | return -EBADF; | |
451 | ||
452 | /* Block any attempts on exploiting Linux' liberal argv[] handling, i.e. CVE-2021-4034 and suchlike */ | |
453 | if (isempty(executable) || strv_isempty(argv)) | |
454 | return -EINVAL; | |
455 | ||
ceedbf81 | 456 | #if ENABLE_FEXECVE |
69339ae9 | 457 | |
8939eeae | 458 | execveat(executable_fd, "", argv, envp, AT_EMPTY_PATH); |
3f51bbff ZJS |
459 | |
460 | if (IN_SET(errno, ENOSYS, ENOENT) || ERRNO_IS_PRIVILEGE(errno)) | |
461 | /* Old kernel or a script or an overzealous seccomp filter? Let's fall back to execve(). | |
a6d9111c ZJS |
462 | * |
463 | * fexecve(3): "If fd refers to a script (i.e., it is an executable text file that names a | |
464 | * script interpreter with a first line that begins with the characters #!) and the | |
465 | * close-on-exec flag has been set for fd, then fexecve() fails with the error ENOENT. This | |
466 | * error occurs because, by the time the script interpreter is executed, fd has already been | |
467 | * closed because of the close-on-exec flag. Thus, the close-on-exec flag can't be set on fd | |
468 | * if it refers to a script." | |
469 | * | |
470 | * Unfortunately, if we unset close-on-exec, the script will be executed just fine, but (at | |
471 | * least in case of bash) the script name, $0, will be shown as /dev/fd/nnn, which breaks | |
472 | * scripts which make use of $0. Thus, let's fall back to execve() in this case. | |
473 | */ | |
ceedbf81 | 474 | #endif |
a6d9111c ZJS |
475 | execve(executable, argv, envp); |
476 | return -errno; | |
477 | } | |
3e24e8cd | 478 | |
c85cb3bc | 479 | int fork_agent(const char *name, const int except[], size_t n_except, pid_t *ret_pid, const char *path, ...) { |
3e24e8cd ZJS |
480 | bool stdout_is_tty, stderr_is_tty; |
481 | size_t n, i; | |
482 | va_list ap; | |
483 | char **l; | |
484 | int r; | |
485 | ||
486 | assert(path); | |
487 | ||
488 | /* Spawns a temporary TTY agent, making sure it goes away when we go away */ | |
489 | ||
490 | r = safe_fork_full(name, | |
911f8f01 | 491 | NULL, |
3e24e8cd ZJS |
492 | except, |
493 | n_except, | |
f3f2d02e | 494 | FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_CLOSE_ALL_FDS|FORK_REOPEN_LOG|FORK_RLIMIT_NOFILE_SAFE, |
3e24e8cd ZJS |
495 | ret_pid); |
496 | if (r < 0) | |
497 | return r; | |
498 | if (r > 0) | |
499 | return 0; | |
500 | ||
501 | /* In the child: */ | |
502 | ||
503 | stdout_is_tty = isatty(STDOUT_FILENO); | |
504 | stderr_is_tty = isatty(STDERR_FILENO); | |
505 | ||
506 | if (!stdout_is_tty || !stderr_is_tty) { | |
507 | int fd; | |
508 | ||
509 | /* Detach from stdout/stderr and reopen /dev/tty for them. This is important to ensure that | |
510 | * when systemctl is started via popen() or a similar call that expects to read EOF we | |
511 | * actually do generate EOF and not delay this indefinitely by keeping an unused copy of | |
512 | * stdin around. */ | |
513 | fd = open("/dev/tty", O_WRONLY); | |
514 | if (fd < 0) { | |
b98416e1 | 515 | if (errno != ENXIO) { |
0bcf1679 LP |
516 | log_error_errno(errno, "Failed to open /dev/tty: %m"); |
517 | _exit(EXIT_FAILURE); | |
518 | } | |
3e24e8cd | 519 | |
0bcf1679 LP |
520 | /* If we get ENXIO here we have no controlling TTY even though stdout/stderr are |
521 | * connected to a TTY. That's a weird setup, but let's handle it gracefully: let's | |
522 | * skip the forking of the agents, given the TTY setup is not in order. */ | |
523 | } else { | |
524 | if (!stdout_is_tty && dup2(fd, STDOUT_FILENO) < 0) { | |
525 | log_error_errno(errno, "Failed to dup2 /dev/tty: %m"); | |
526 | _exit(EXIT_FAILURE); | |
527 | } | |
3e24e8cd | 528 | |
0bcf1679 LP |
529 | if (!stderr_is_tty && dup2(fd, STDERR_FILENO) < 0) { |
530 | log_error_errno(errno, "Failed to dup2 /dev/tty: %m"); | |
531 | _exit(EXIT_FAILURE); | |
532 | } | |
3e24e8cd | 533 | |
0bcf1679 LP |
534 | fd = safe_close_above_stdio(fd); |
535 | } | |
3e24e8cd ZJS |
536 | } |
537 | ||
3e24e8cd ZJS |
538 | /* Count arguments */ |
539 | va_start(ap, path); | |
540 | for (n = 0; va_arg(ap, char*); n++) | |
541 | ; | |
542 | va_end(ap); | |
543 | ||
544 | /* Allocate strv */ | |
545 | l = newa(char*, n + 1); | |
546 | ||
547 | /* Fill in arguments */ | |
548 | va_start(ap, path); | |
549 | for (i = 0; i <= n; i++) | |
550 | l[i] = va_arg(ap, char*); | |
551 | va_end(ap); | |
552 | ||
553 | execv(path, l); | |
554 | _exit(EXIT_FAILURE); | |
555 | } |