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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
89711996 ZJS |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <dirent.h> | |
22 | #include <errno.h> | |
23 | #include <sys/prctl.h> | |
24 | #include <sys/types.h> | |
25 | #include <unistd.h> | |
c6e47247 | 26 | #include <stdio.h> |
89711996 ZJS |
27 | |
28 | #include "alloc-util.h" | |
2e4cfe65 | 29 | #include "conf-files.h" |
c6e47247 | 30 | #include "env-util.h" |
89711996 | 31 | #include "exec-util.h" |
c6e47247 ZJS |
32 | #include "fd-util.h" |
33 | #include "fileio.h" | |
89711996 ZJS |
34 | #include "hashmap.h" |
35 | #include "macro.h" | |
36 | #include "process-util.h" | |
37 | #include "set.h" | |
38 | #include "signal-util.h" | |
39 | #include "stat-util.h" | |
40 | #include "string-util.h" | |
41 | #include "strv.h" | |
c6e47247 | 42 | #include "terminal-util.h" |
89711996 ZJS |
43 | #include "util.h" |
44 | ||
45 | /* Put this test here for a lack of better place */ | |
46 | assert_cc(EAGAIN == EWOULDBLOCK); | |
47 | ||
c6e47247 ZJS |
48 | static int do_spawn(const char *path, char *argv[], int stdout_fd, pid_t *pid) { |
49 | ||
cf55fc18 | 50 | pid_t _pid; |
4c253ed1 | 51 | int r; |
cf55fc18 ZJS |
52 | |
53 | if (null_or_empty_path(path)) { | |
54 | log_debug("%s is empty (a mask).", path); | |
55 | return 0; | |
56 | } | |
57 | ||
b6e1fff1 | 58 | r = safe_fork("(direxec)", FORK_DEATHSIG|FORK_LOG, &_pid); |
4c253ed1 | 59 | if (r < 0) |
b6e1fff1 | 60 | return r; |
4c253ed1 | 61 | if (r == 0) { |
cf55fc18 ZJS |
62 | char *_argv[2]; |
63 | ||
c6e47247 | 64 | if (stdout_fd >= 0) { |
2b33ab09 LP |
65 | r = rearrange_stdio(STDIN_FILENO, stdout_fd, STDERR_FILENO); |
66 | if (r < 0) | |
3554ef51 | 67 | _exit(EXIT_FAILURE); |
c6e47247 ZJS |
68 | } |
69 | ||
cf55fc18 ZJS |
70 | if (!argv) { |
71 | _argv[0] = (char*) path; | |
72 | _argv[1] = NULL; | |
73 | argv = _argv; | |
74 | } else | |
75 | argv[0] = (char*) path; | |
76 | ||
77 | execv(path, argv); | |
78 | log_error_errno(errno, "Failed to execute %s: %m", path); | |
79 | _exit(EXIT_FAILURE); | |
80 | } | |
81 | ||
cf55fc18 ZJS |
82 | *pid = _pid; |
83 | return 1; | |
84 | } | |
85 | ||
c6e47247 ZJS |
86 | static int do_execute( |
87 | char **directories, | |
88 | usec_t timeout, | |
89 | gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX], | |
90 | void* const callback_args[_STDOUT_CONSUME_MAX], | |
91 | int output_fd, | |
92 | char *argv[]) { | |
93 | ||
89711996 | 94 | _cleanup_hashmap_free_free_ Hashmap *pids = NULL; |
2e4cfe65 ZJS |
95 | _cleanup_strv_free_ char **paths = NULL; |
96 | char **path; | |
97 | int r; | |
89711996 | 98 | |
c6e47247 ZJS |
99 | /* We fork this all off from a child process so that we can somewhat cleanly make |
100 | * use of SIGALRM to set a time limit. | |
101 | * | |
102 | * If callbacks is nonnull, execution is serial. Otherwise, we default to parallel. | |
103 | */ | |
89711996 | 104 | |
b5084605 | 105 | r = conf_files_list_strv(&paths, NULL, NULL, CONF_FILES_EXECUTABLE, (const char* const*) directories); |
2e4cfe65 ZJS |
106 | if (r < 0) |
107 | return r; | |
108 | ||
c6e47247 ZJS |
109 | if (!callbacks) { |
110 | pids = hashmap_new(NULL); | |
111 | if (!pids) | |
112 | return log_oom(); | |
113 | } | |
114 | ||
115 | /* Abort execution of this process after the timout. We simply rely on SIGALRM as | |
116 | * default action terminating the process, and turn on alarm(). */ | |
117 | ||
118 | if (timeout != USEC_INFINITY) | |
119 | alarm((timeout + USEC_PER_SEC - 1) / USEC_PER_SEC); | |
89711996 | 120 | |
2e4cfe65 ZJS |
121 | STRV_FOREACH(path, paths) { |
122 | _cleanup_free_ char *t = NULL; | |
c6e47247 | 123 | _cleanup_close_ int fd = -1; |
2e4cfe65 | 124 | pid_t pid; |
89711996 | 125 | |
2e4cfe65 ZJS |
126 | t = strdup(*path); |
127 | if (!t) | |
128 | return log_oom(); | |
89711996 | 129 | |
c6e47247 ZJS |
130 | if (callbacks) { |
131 | fd = open_serialization_fd(basename(*path)); | |
132 | if (fd < 0) | |
133 | return log_error_errno(fd, "Failed to open serialization file: %m"); | |
134 | } | |
135 | ||
136 | r = do_spawn(t, argv, fd, &pid); | |
2e4cfe65 ZJS |
137 | if (r <= 0) |
138 | continue; | |
89711996 | 139 | |
c6e47247 ZJS |
140 | if (pids) { |
141 | r = hashmap_put(pids, PID_TO_PTR(pid), t); | |
142 | if (r < 0) | |
143 | return log_oom(); | |
144 | t = NULL; | |
145 | } else { | |
7d4904fe | 146 | r = wait_for_terminate_and_check(t, pid, WAIT_LOG); |
c6e47247 ZJS |
147 | if (r < 0) |
148 | continue; | |
149 | ||
150 | if (lseek(fd, 0, SEEK_SET) < 0) | |
151 | return log_error_errno(errno, "Failed to seek on serialization fd: %m"); | |
152 | ||
153 | r = callbacks[STDOUT_GENERATE](fd, callback_args[STDOUT_GENERATE]); | |
154 | fd = -1; | |
155 | if (r < 0) | |
156 | return log_error_errno(r, "Failed to process output from %s: %m", *path); | |
157 | } | |
89711996 ZJS |
158 | } |
159 | ||
c6e47247 ZJS |
160 | if (callbacks) { |
161 | r = callbacks[STDOUT_COLLECT](output_fd, callback_args[STDOUT_COLLECT]); | |
162 | if (r < 0) | |
163 | return log_error_errno(r, "Callback two failed: %m"); | |
164 | } | |
89711996 ZJS |
165 | |
166 | while (!hashmap_isempty(pids)) { | |
2e4cfe65 | 167 | _cleanup_free_ char *t = NULL; |
89711996 ZJS |
168 | pid_t pid; |
169 | ||
170 | pid = PTR_TO_PID(hashmap_first_key(pids)); | |
171 | assert(pid > 0); | |
172 | ||
2e4cfe65 ZJS |
173 | t = hashmap_remove(pids, PID_TO_PTR(pid)); |
174 | assert(t); | |
89711996 | 175 | |
7d4904fe | 176 | (void) wait_for_terminate_and_check(t, pid, WAIT_LOG); |
89711996 ZJS |
177 | } |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
c6e47247 ZJS |
182 | int execute_directories( |
183 | const char* const* directories, | |
184 | usec_t timeout, | |
185 | gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX], | |
186 | void* const callback_args[_STDOUT_CONSUME_MAX], | |
187 | char *argv[]) { | |
188 | ||
89711996 | 189 | char **dirs = (char**) directories; |
c6e47247 | 190 | _cleanup_close_ int fd = -1; |
1f5d1e02 | 191 | char *name; |
c6e47247 | 192 | int r; |
89711996 ZJS |
193 | |
194 | assert(!strv_isempty(dirs)); | |
195 | ||
196 | name = basename(dirs[0]); | |
197 | assert(!isempty(name)); | |
198 | ||
c6e47247 ZJS |
199 | if (callbacks) { |
200 | assert(callback_args); | |
201 | assert(callbacks[STDOUT_GENERATE]); | |
202 | assert(callbacks[STDOUT_COLLECT]); | |
203 | assert(callbacks[STDOUT_CONSUME]); | |
204 | ||
205 | fd = open_serialization_fd(name); | |
206 | if (fd < 0) | |
207 | return log_error_errno(fd, "Failed to open serialization file: %m"); | |
208 | } | |
209 | ||
210 | /* Executes all binaries in the directories serially or in parallel and waits for | |
211 | * them to finish. Optionally a timeout is applied. If a file with the same name | |
212 | * exists in more than one directory, the earliest one wins. */ | |
89711996 | 213 | |
1f5d1e02 | 214 | r = safe_fork("(sd-executor)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT, NULL); |
4c253ed1 | 215 | if (r < 0) |
b6e1fff1 | 216 | return r; |
4c253ed1 | 217 | if (r == 0) { |
c6e47247 | 218 | r = do_execute(dirs, timeout, callbacks, callback_args, fd, argv); |
89711996 ZJS |
219 | _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
220 | } | |
221 | ||
c6e47247 ZJS |
222 | if (!callbacks) |
223 | return 0; | |
224 | ||
225 | if (lseek(fd, 0, SEEK_SET) < 0) | |
226 | return log_error_errno(errno, "Failed to rewind serialization fd: %m"); | |
227 | ||
228 | r = callbacks[STDOUT_CONSUME](fd, callback_args[STDOUT_CONSUME]); | |
229 | fd = -1; | |
230 | if (r < 0) | |
231 | return log_error_errno(r, "Failed to parse returned data: %m"); | |
232 | return 0; | |
89711996 | 233 | } |
3303d1b2 ZJS |
234 | |
235 | static int gather_environment_generate(int fd, void *arg) { | |
236 | char ***env = arg, **x, **y; | |
237 | _cleanup_fclose_ FILE *f = NULL; | |
3f199740 | 238 | _cleanup_strv_free_ char **new = NULL; |
3303d1b2 ZJS |
239 | int r; |
240 | ||
241 | /* Read a series of VAR=value assignments from fd, use them to update the list of | |
242 | * variables in env. Also update the exported environment. | |
243 | * | |
244 | * fd is always consumed, even on error. | |
245 | */ | |
246 | ||
247 | assert(env); | |
248 | ||
249 | f = fdopen(fd, "r"); | |
250 | if (!f) { | |
251 | safe_close(fd); | |
252 | return -errno; | |
253 | } | |
254 | ||
255 | r = load_env_file_pairs(f, NULL, NULL, &new); | |
256 | if (r < 0) | |
257 | return r; | |
258 | ||
259 | STRV_FOREACH_PAIR(x, y, new) { | |
260 | char *p; | |
261 | ||
184d1904 ZJS |
262 | if (!env_name_is_valid(*x)) { |
263 | log_warning("Invalid variable assignment \"%s=...\", ignoring.", *x); | |
264 | continue; | |
265 | } | |
266 | ||
3303d1b2 ZJS |
267 | p = strjoin(*x, "=", *y); |
268 | if (!p) | |
269 | return -ENOMEM; | |
270 | ||
271 | r = strv_env_replace(env, p); | |
272 | if (r < 0) | |
273 | return r; | |
274 | ||
275 | if (setenv(*x, *y, true) < 0) | |
276 | return -errno; | |
277 | } | |
278 | ||
279 | return r; | |
280 | } | |
281 | ||
282 | static int gather_environment_collect(int fd, void *arg) { | |
283 | char ***env = arg; | |
284 | _cleanup_fclose_ FILE *f = NULL; | |
285 | int r; | |
286 | ||
287 | /* Write out a series of env=cescape(VAR=value) assignments to fd. */ | |
288 | ||
289 | assert(env); | |
290 | ||
291 | f = fdopen(fd, "w"); | |
292 | if (!f) { | |
293 | safe_close(fd); | |
294 | return -errno; | |
295 | } | |
296 | ||
297 | r = serialize_environment(f, *env); | |
298 | if (r < 0) | |
299 | return r; | |
300 | ||
301 | if (ferror(f)) | |
302 | return errno > 0 ? -errno : -EIO; | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
307 | static int gather_environment_consume(int fd, void *arg) { | |
308 | char ***env = arg; | |
309 | _cleanup_fclose_ FILE *f = NULL; | |
310 | char line[LINE_MAX]; | |
311 | int r = 0, k; | |
312 | ||
313 | /* Read a series of env=cescape(VAR=value) assignments from fd into env. */ | |
314 | ||
315 | assert(env); | |
316 | ||
317 | f = fdopen(fd, "r"); | |
318 | if (!f) { | |
319 | safe_close(fd); | |
320 | return -errno; | |
321 | } | |
322 | ||
323 | FOREACH_LINE(line, f, return -EIO) { | |
324 | truncate_nl(line); | |
325 | ||
326 | k = deserialize_environment(env, line); | |
327 | if (k < 0) | |
328 | log_error_errno(k, "Invalid line \"%s\": %m", line); | |
329 | if (k < 0 && r == 0) | |
330 | r = k; | |
331 | } | |
332 | ||
333 | return r; | |
334 | } | |
335 | ||
336 | const gather_stdout_callback_t gather_environment[] = { | |
337 | gather_environment_generate, | |
338 | gather_environment_collect, | |
339 | gather_environment_consume, | |
340 | }; |