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52ad194e | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2897b343 MP |
2 | |
3 | #include <dirent.h> | |
4 | #include <errno.h> | |
5 | #include <sys/prctl.h> | |
6 | #include <sys/types.h> | |
7 | #include <unistd.h> | |
8 | #include <stdio.h> | |
9 | ||
10 | #include "alloc-util.h" | |
11 | #include "conf-files.h" | |
6e866b33 | 12 | #include "env-file.h" |
2897b343 MP |
13 | #include "env-util.h" |
14 | #include "exec-util.h" | |
15 | #include "fd-util.h" | |
16 | #include "fileio.h" | |
17 | #include "hashmap.h" | |
18 | #include "macro.h" | |
19 | #include "process-util.h" | |
6e866b33 MB |
20 | #include "rlimit-util.h" |
21 | #include "serialize.h" | |
2897b343 MP |
22 | #include "set.h" |
23 | #include "signal-util.h" | |
24 | #include "stat-util.h" | |
25 | #include "string-util.h" | |
26 | #include "strv.h" | |
27 | #include "terminal-util.h" | |
6e866b33 | 28 | #include "tmpfile-util.h" |
2897b343 MP |
29 | #include "util.h" |
30 | ||
31 | /* Put this test here for a lack of better place */ | |
32 | assert_cc(EAGAIN == EWOULDBLOCK); | |
33 | ||
34 | static int do_spawn(const char *path, char *argv[], int stdout_fd, pid_t *pid) { | |
35 | ||
36 | pid_t _pid; | |
1d42b86d | 37 | int r; |
2897b343 MP |
38 | |
39 | if (null_or_empty_path(path)) { | |
40 | log_debug("%s is empty (a mask).", path); | |
41 | return 0; | |
42 | } | |
43 | ||
1d42b86d MB |
44 | r = safe_fork("(direxec)", FORK_DEATHSIG|FORK_LOG, &_pid); |
45 | if (r < 0) | |
46 | return r; | |
47 | if (r == 0) { | |
2897b343 MP |
48 | char *_argv[2]; |
49 | ||
2897b343 | 50 | if (stdout_fd >= 0) { |
98393f85 MB |
51 | r = rearrange_stdio(STDIN_FILENO, stdout_fd, STDERR_FILENO); |
52 | if (r < 0) | |
53 | _exit(EXIT_FAILURE); | |
2897b343 MP |
54 | } |
55 | ||
6e866b33 MB |
56 | (void) rlimit_nofile_safe(); |
57 | ||
2897b343 MP |
58 | if (!argv) { |
59 | _argv[0] = (char*) path; | |
60 | _argv[1] = NULL; | |
61 | argv = _argv; | |
62 | } else | |
63 | argv[0] = (char*) path; | |
64 | ||
65 | execv(path, argv); | |
66 | log_error_errno(errno, "Failed to execute %s: %m", path); | |
67 | _exit(EXIT_FAILURE); | |
68 | } | |
69 | ||
2897b343 MP |
70 | *pid = _pid; |
71 | return 1; | |
72 | } | |
73 | ||
74 | static int do_execute( | |
75 | char **directories, | |
76 | usec_t timeout, | |
77 | gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX], | |
78 | void* const callback_args[_STDOUT_CONSUME_MAX], | |
79 | int output_fd, | |
6e866b33 | 80 | char *argv[], |
bb4f798a MB |
81 | char *envp[], |
82 | ExecDirFlags flags) { | |
2897b343 MP |
83 | |
84 | _cleanup_hashmap_free_free_ Hashmap *pids = NULL; | |
85 | _cleanup_strv_free_ char **paths = NULL; | |
6e866b33 | 86 | char **path, **e; |
2897b343 | 87 | int r; |
bb4f798a | 88 | bool parallel_execution; |
2897b343 MP |
89 | |
90 | /* We fork this all off from a child process so that we can somewhat cleanly make | |
91 | * use of SIGALRM to set a time limit. | |
92 | * | |
bb4f798a MB |
93 | * We attempt to perform parallel execution if configured by the user, however |
94 | * if `callbacks` is nonnull, execution must be serial. | |
2897b343 | 95 | */ |
bb4f798a | 96 | parallel_execution = FLAGS_SET(flags, EXEC_DIR_PARALLEL) && !callbacks; |
2897b343 | 97 | |
b012e921 | 98 | r = conf_files_list_strv(&paths, NULL, NULL, CONF_FILES_EXECUTABLE|CONF_FILES_REGULAR|CONF_FILES_FILTER_MASKED, (const char* const*) directories); |
2897b343 | 99 | if (r < 0) |
6e866b33 | 100 | return log_error_errno(r, "Failed to enumerate executables: %m"); |
2897b343 | 101 | |
bb4f798a | 102 | if (parallel_execution) { |
2897b343 MP |
103 | pids = hashmap_new(NULL); |
104 | if (!pids) | |
105 | return log_oom(); | |
106 | } | |
107 | ||
108 | /* Abort execution of this process after the timout. We simply rely on SIGALRM as | |
109 | * default action terminating the process, and turn on alarm(). */ | |
110 | ||
111 | if (timeout != USEC_INFINITY) | |
b012e921 | 112 | alarm(DIV_ROUND_UP(timeout, USEC_PER_SEC)); |
2897b343 | 113 | |
6e866b33 MB |
114 | STRV_FOREACH(e, envp) |
115 | if (putenv(*e) != 0) | |
116 | return log_error_errno(errno, "Failed to set environment variable: %m"); | |
117 | ||
2897b343 MP |
118 | STRV_FOREACH(path, paths) { |
119 | _cleanup_free_ char *t = NULL; | |
120 | _cleanup_close_ int fd = -1; | |
121 | pid_t pid; | |
122 | ||
123 | t = strdup(*path); | |
124 | if (!t) | |
125 | return log_oom(); | |
126 | ||
127 | if (callbacks) { | |
128 | fd = open_serialization_fd(basename(*path)); | |
129 | if (fd < 0) | |
130 | return log_error_errno(fd, "Failed to open serialization file: %m"); | |
131 | } | |
132 | ||
133 | r = do_spawn(t, argv, fd, &pid); | |
134 | if (r <= 0) | |
135 | continue; | |
136 | ||
bb4f798a | 137 | if (parallel_execution) { |
2897b343 MP |
138 | r = hashmap_put(pids, PID_TO_PTR(pid), t); |
139 | if (r < 0) | |
140 | return log_oom(); | |
141 | t = NULL; | |
142 | } else { | |
1d42b86d | 143 | r = wait_for_terminate_and_check(t, pid, WAIT_LOG); |
bb4f798a MB |
144 | if (FLAGS_SET(flags, EXEC_DIR_IGNORE_ERRORS)) { |
145 | if (r < 0) | |
146 | continue; | |
147 | } else if (r > 0) | |
148 | return r; | |
149 | ||
150 | if (callbacks) { | |
151 | if (lseek(fd, 0, SEEK_SET) < 0) | |
152 | return log_error_errno(errno, "Failed to seek on serialization fd: %m"); | |
153 | ||
154 | r = callbacks[STDOUT_GENERATE](fd, callback_args[STDOUT_GENERATE]); | |
155 | fd = -1; | |
156 | if (r < 0) | |
157 | return log_error_errno(r, "Failed to process output from %s: %m", *path); | |
158 | } | |
2897b343 MP |
159 | } |
160 | } | |
161 | ||
162 | if (callbacks) { | |
163 | r = callbacks[STDOUT_COLLECT](output_fd, callback_args[STDOUT_COLLECT]); | |
164 | if (r < 0) | |
165 | return log_error_errno(r, "Callback two failed: %m"); | |
166 | } | |
167 | ||
168 | while (!hashmap_isempty(pids)) { | |
169 | _cleanup_free_ char *t = NULL; | |
170 | pid_t pid; | |
171 | ||
172 | pid = PTR_TO_PID(hashmap_first_key(pids)); | |
173 | assert(pid > 0); | |
174 | ||
175 | t = hashmap_remove(pids, PID_TO_PTR(pid)); | |
176 | assert(t); | |
177 | ||
bb4f798a MB |
178 | r = wait_for_terminate_and_check(t, pid, WAIT_LOG); |
179 | if (!FLAGS_SET(flags, EXEC_DIR_IGNORE_ERRORS) && r > 0) | |
180 | return r; | |
2897b343 MP |
181 | } |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | int execute_directories( | |
187 | const char* const* directories, | |
188 | usec_t timeout, | |
189 | gather_stdout_callback_t const callbacks[_STDOUT_CONSUME_MAX], | |
190 | void* const callback_args[_STDOUT_CONSUME_MAX], | |
6e866b33 | 191 | char *argv[], |
bb4f798a MB |
192 | char *envp[], |
193 | ExecDirFlags flags) { | |
2897b343 | 194 | |
2897b343 MP |
195 | char **dirs = (char**) directories; |
196 | _cleanup_close_ int fd = -1; | |
1d42b86d | 197 | char *name; |
2897b343 | 198 | int r; |
bb4f798a | 199 | pid_t executor_pid; |
2897b343 MP |
200 | |
201 | assert(!strv_isempty(dirs)); | |
202 | ||
203 | name = basename(dirs[0]); | |
204 | assert(!isempty(name)); | |
205 | ||
206 | if (callbacks) { | |
207 | assert(callback_args); | |
208 | assert(callbacks[STDOUT_GENERATE]); | |
209 | assert(callbacks[STDOUT_COLLECT]); | |
210 | assert(callbacks[STDOUT_CONSUME]); | |
211 | ||
212 | fd = open_serialization_fd(name); | |
213 | if (fd < 0) | |
214 | return log_error_errno(fd, "Failed to open serialization file: %m"); | |
215 | } | |
216 | ||
217 | /* Executes all binaries in the directories serially or in parallel and waits for | |
218 | * them to finish. Optionally a timeout is applied. If a file with the same name | |
219 | * exists in more than one directory, the earliest one wins. */ | |
220 | ||
bb4f798a | 221 | r = safe_fork("(sd-executor)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &executor_pid); |
1d42b86d MB |
222 | if (r < 0) |
223 | return r; | |
224 | if (r == 0) { | |
bb4f798a MB |
225 | r = do_execute(dirs, timeout, callbacks, callback_args, fd, argv, envp, flags); |
226 | _exit(r < 0 ? EXIT_FAILURE : r); | |
2897b343 MP |
227 | } |
228 | ||
bb4f798a MB |
229 | r = wait_for_terminate_and_check("(sd-executor)", executor_pid, 0); |
230 | if (r < 0) | |
231 | return r; | |
232 | if (!FLAGS_SET(flags, EXEC_DIR_IGNORE_ERRORS) && r > 0) | |
233 | return r; | |
234 | ||
2897b343 MP |
235 | if (!callbacks) |
236 | return 0; | |
237 | ||
238 | if (lseek(fd, 0, SEEK_SET) < 0) | |
239 | return log_error_errno(errno, "Failed to rewind serialization fd: %m"); | |
240 | ||
241 | r = callbacks[STDOUT_CONSUME](fd, callback_args[STDOUT_CONSUME]); | |
242 | fd = -1; | |
243 | if (r < 0) | |
244 | return log_error_errno(r, "Failed to parse returned data: %m"); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static int gather_environment_generate(int fd, void *arg) { | |
249 | char ***env = arg, **x, **y; | |
250 | _cleanup_fclose_ FILE *f = NULL; | |
52ad194e | 251 | _cleanup_strv_free_ char **new = NULL; |
2897b343 MP |
252 | int r; |
253 | ||
254 | /* Read a series of VAR=value assignments from fd, use them to update the list of | |
255 | * variables in env. Also update the exported environment. | |
256 | * | |
257 | * fd is always consumed, even on error. | |
258 | */ | |
259 | ||
260 | assert(env); | |
261 | ||
262 | f = fdopen(fd, "r"); | |
263 | if (!f) { | |
264 | safe_close(fd); | |
265 | return -errno; | |
266 | } | |
267 | ||
6e866b33 | 268 | r = load_env_file_pairs(f, NULL, &new); |
2897b343 MP |
269 | if (r < 0) |
270 | return r; | |
271 | ||
272 | STRV_FOREACH_PAIR(x, y, new) { | |
273 | char *p; | |
274 | ||
275 | if (!env_name_is_valid(*x)) { | |
276 | log_warning("Invalid variable assignment \"%s=...\", ignoring.", *x); | |
277 | continue; | |
278 | } | |
279 | ||
280 | p = strjoin(*x, "=", *y); | |
281 | if (!p) | |
282 | return -ENOMEM; | |
283 | ||
284 | r = strv_env_replace(env, p); | |
285 | if (r < 0) | |
286 | return r; | |
287 | ||
288 | if (setenv(*x, *y, true) < 0) | |
289 | return -errno; | |
290 | } | |
291 | ||
292 | return r; | |
293 | } | |
294 | ||
295 | static int gather_environment_collect(int fd, void *arg) { | |
2897b343 | 296 | _cleanup_fclose_ FILE *f = NULL; |
6e866b33 | 297 | char ***env = arg; |
2897b343 MP |
298 | int r; |
299 | ||
300 | /* Write out a series of env=cescape(VAR=value) assignments to fd. */ | |
301 | ||
302 | assert(env); | |
303 | ||
304 | f = fdopen(fd, "w"); | |
305 | if (!f) { | |
306 | safe_close(fd); | |
307 | return -errno; | |
308 | } | |
309 | ||
6e866b33 | 310 | r = serialize_strv(f, "env", *env); |
2897b343 MP |
311 | if (r < 0) |
312 | return r; | |
313 | ||
6e866b33 MB |
314 | r = fflush_and_check(f); |
315 | if (r < 0) | |
316 | return r; | |
2897b343 MP |
317 | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static int gather_environment_consume(int fd, void *arg) { | |
2897b343 | 322 | _cleanup_fclose_ FILE *f = NULL; |
6e866b33 MB |
323 | char ***env = arg; |
324 | int r = 0; | |
2897b343 MP |
325 | |
326 | /* Read a series of env=cescape(VAR=value) assignments from fd into env. */ | |
327 | ||
328 | assert(env); | |
329 | ||
330 | f = fdopen(fd, "r"); | |
331 | if (!f) { | |
332 | safe_close(fd); | |
333 | return -errno; | |
334 | } | |
335 | ||
6e866b33 MB |
336 | for (;;) { |
337 | _cleanup_free_ char *line = NULL; | |
338 | const char *v; | |
339 | int k; | |
2897b343 | 340 | |
6e866b33 | 341 | k = read_line(f, LONG_LINE_MAX, &line); |
2897b343 | 342 | if (k < 0) |
6e866b33 MB |
343 | return k; |
344 | if (k == 0) | |
345 | break; | |
346 | ||
347 | v = startswith(line, "env="); | |
348 | if (!v) { | |
349 | log_debug("Serialization line \"%s\" unexpectedly didn't start with \"env=\".", line); | |
350 | if (r == 0) | |
351 | r = -EINVAL; | |
352 | ||
353 | continue; | |
354 | } | |
355 | ||
356 | k = deserialize_environment(v, env); | |
357 | if (k < 0) { | |
358 | log_debug_errno(k, "Invalid serialization line \"%s\": %m", line); | |
359 | ||
360 | if (r == 0) | |
361 | r = k; | |
362 | } | |
2897b343 MP |
363 | } |
364 | ||
365 | return r; | |
366 | } | |
367 | ||
368 | const gather_stdout_callback_t gather_environment[] = { | |
369 | gather_environment_generate, | |
370 | gather_environment_collect, | |
371 | gather_environment_consume, | |
372 | }; |