Line data Source code
1 : /* SPDX-License-Identifier: LGPL-2.1+ */
2 :
3 : #include <fcntl.h>
4 : #include <getopt.h>
5 : #include <stdio.h>
6 : #include <stdlib.h>
7 : #include <unistd.h>
8 :
9 : #include "sd-bus.h"
10 :
11 : #include "alloc-util.h"
12 : #include "bus-error.h"
13 : #include "bus-util.h"
14 : #include "fd-util.h"
15 : #include "format-table.h"
16 : #include "format-util.h"
17 : #include "main-func.h"
18 : #include "pager.h"
19 : #include "pretty-print.h"
20 : #include "process-util.h"
21 : #include "signal-util.h"
22 : #include "strv.h"
23 : #include "user-util.h"
24 : #include "util.h"
25 :
26 : static const char* arg_what = "idle:sleep:shutdown";
27 : static const char* arg_who = NULL;
28 : static const char* arg_why = "Unknown reason";
29 : static const char* arg_mode = NULL;
30 : static PagerFlags arg_pager_flags = 0;
31 : static bool arg_legend = true;
32 :
33 : static enum {
34 : ACTION_INHIBIT,
35 : ACTION_LIST
36 : } arg_action = ACTION_INHIBIT;
37 :
38 0 : static int inhibit(sd_bus *bus, sd_bus_error *error) {
39 0 : _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
40 : int r;
41 : int fd;
42 :
43 0 : r = sd_bus_call_method(
44 : bus,
45 : "org.freedesktop.login1",
46 : "/org/freedesktop/login1",
47 : "org.freedesktop.login1.Manager",
48 : "Inhibit",
49 : error,
50 : &reply,
51 : "ssss", arg_what, arg_who, arg_why, arg_mode);
52 0 : if (r < 0)
53 0 : return r;
54 :
55 0 : r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_UNIX_FD, &fd);
56 0 : if (r < 0)
57 0 : return r;
58 :
59 0 : r = fcntl(fd, F_DUPFD_CLOEXEC, 3);
60 0 : if (r < 0)
61 0 : return -errno;
62 :
63 0 : return r;
64 : }
65 :
66 0 : static int print_inhibitors(sd_bus *bus) {
67 0 : _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
68 0 : _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
69 0 : _cleanup_(table_unrefp) Table *table = NULL;
70 : int r;
71 :
72 0 : (void) pager_open(arg_pager_flags);
73 :
74 0 : r = sd_bus_call_method(
75 : bus,
76 : "org.freedesktop.login1",
77 : "/org/freedesktop/login1",
78 : "org.freedesktop.login1.Manager",
79 : "ListInhibitors",
80 : &error,
81 : &reply,
82 : "");
83 0 : if (r < 0)
84 0 : return log_error_errno(r, "Could not get active inhibitors: %s", bus_error_message(&error, r));
85 :
86 0 : table = table_new("who", "uid", "user", "pid", "comm", "what", "why", "mode");
87 0 : if (!table)
88 0 : return log_oom();
89 :
90 : /* If there's not enough space, shorten the "WHY" column, as it's little more than an explaining comment. */
91 0 : (void) table_set_weight(table, TABLE_HEADER_CELL(6), 20);
92 :
93 0 : r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssuu)");
94 0 : if (r < 0)
95 0 : return bus_log_parse_error(r);
96 :
97 0 : for (;;) {
98 0 : _cleanup_free_ char *comm = NULL, *u = NULL;
99 : const char *what, *who, *why, *mode;
100 : uint32_t uid, pid;
101 :
102 0 : r = sd_bus_message_read(reply, "(ssssuu)", &what, &who, &why, &mode, &uid, &pid);
103 0 : if (r < 0)
104 0 : return bus_log_parse_error(r);
105 0 : if (r == 0)
106 0 : break;
107 :
108 0 : if (arg_mode && !streq(mode, arg_mode))
109 0 : continue;
110 :
111 0 : (void) get_process_comm(pid, &comm);
112 0 : u = uid_to_name(uid);
113 :
114 0 : r = table_add_many(table,
115 : TABLE_STRING, who,
116 : TABLE_UINT32, uid,
117 : TABLE_STRING, strna(u),
118 : TABLE_UINT32, pid,
119 : TABLE_STRING, strna(comm),
120 : TABLE_STRING, what,
121 : TABLE_STRING, why,
122 : TABLE_STRING, mode);
123 0 : if (r < 0)
124 0 : return log_error_errno(r, "Failed to add table row: %m");
125 : }
126 :
127 0 : r = sd_bus_message_exit_container(reply);
128 0 : if (r < 0)
129 0 : return bus_log_parse_error(r);
130 :
131 0 : if (table_get_rows(table) > 1) {
132 0 : r = table_set_sort(table, (size_t) 1, (size_t) 0, (size_t) 5, (size_t) 6, (size_t) -1);
133 0 : if (r < 0)
134 0 : return log_error_errno(r, "Failed to sort table: %m");
135 :
136 0 : table_set_header(table, arg_legend);
137 :
138 0 : r = table_print(table, NULL);
139 0 : if (r < 0)
140 0 : return log_error_errno(r, "Failed to show table: %m");
141 : }
142 :
143 0 : if (arg_legend) {
144 0 : if (table_get_rows(table) > 1)
145 0 : printf("\n%zu inhibitors listed.\n", table_get_rows(table) - 1);
146 : else
147 0 : printf("No inhibitors.\n");
148 : }
149 :
150 0 : return 0;
151 : }
152 :
153 3 : static int help(void) {
154 3 : _cleanup_free_ char *link = NULL;
155 : int r;
156 :
157 3 : r = terminal_urlify_man("systemd-inhibit", "1", &link);
158 3 : if (r < 0)
159 0 : return log_oom();
160 :
161 3 : printf("%s [OPTIONS...] {COMMAND} ...\n\n"
162 : "Execute a process while inhibiting shutdown/sleep/idle.\n\n"
163 : " -h --help Show this help\n"
164 : " --version Show package version\n"
165 : " --no-pager Do not pipe output into a pager\n"
166 : " --no-legend Do not show the headers and footers\n"
167 : " --what=WHAT Operations to inhibit, colon separated list of:\n"
168 : " shutdown, sleep, idle, handle-power-key,\n"
169 : " handle-suspend-key, handle-hibernate-key,\n"
170 : " handle-lid-switch\n"
171 : " --who=STRING A descriptive string who is inhibiting\n"
172 : " --why=STRING A descriptive string why is being inhibited\n"
173 : " --mode=MODE One of block or delay\n"
174 : " --list List active inhibitors\n"
175 : "\nSee the %s for details.\n"
176 : , program_invocation_short_name
177 : , link
178 : );
179 :
180 3 : return 0;
181 : }
182 :
183 4 : static int parse_argv(int argc, char *argv[]) {
184 :
185 : enum {
186 : ARG_VERSION = 0x100,
187 : ARG_WHAT,
188 : ARG_WHO,
189 : ARG_WHY,
190 : ARG_MODE,
191 : ARG_LIST,
192 : ARG_NO_PAGER,
193 : ARG_NO_LEGEND,
194 : };
195 :
196 : static const struct option options[] = {
197 : { "help", no_argument, NULL, 'h' },
198 : { "version", no_argument, NULL, ARG_VERSION },
199 : { "what", required_argument, NULL, ARG_WHAT },
200 : { "who", required_argument, NULL, ARG_WHO },
201 : { "why", required_argument, NULL, ARG_WHY },
202 : { "mode", required_argument, NULL, ARG_MODE },
203 : { "list", no_argument, NULL, ARG_LIST },
204 : { "no-pager", no_argument, NULL, ARG_NO_PAGER },
205 : { "no-legend", no_argument, NULL, ARG_NO_LEGEND },
206 : {}
207 : };
208 :
209 : int c;
210 :
211 4 : assert(argc >= 0);
212 4 : assert(argv);
213 :
214 4 : while ((c = getopt_long(argc, argv, "+h", options, NULL)) >= 0)
215 :
216 4 : switch (c) {
217 :
218 3 : case 'h':
219 3 : return help();
220 :
221 0 : case ARG_VERSION:
222 0 : return version();
223 :
224 0 : case ARG_WHAT:
225 0 : arg_what = optarg;
226 0 : break;
227 :
228 0 : case ARG_WHO:
229 0 : arg_who = optarg;
230 0 : break;
231 :
232 0 : case ARG_WHY:
233 0 : arg_why = optarg;
234 0 : break;
235 :
236 0 : case ARG_MODE:
237 0 : arg_mode = optarg;
238 0 : break;
239 :
240 0 : case ARG_LIST:
241 0 : arg_action = ACTION_LIST;
242 0 : break;
243 :
244 0 : case ARG_NO_PAGER:
245 0 : arg_pager_flags |= PAGER_DISABLE;
246 0 : break;
247 :
248 0 : case ARG_NO_LEGEND:
249 0 : arg_legend = false;
250 0 : break;
251 :
252 1 : case '?':
253 1 : return -EINVAL;
254 :
255 0 : default:
256 0 : assert_not_reached("Unhandled option");
257 : }
258 :
259 0 : if (arg_action == ACTION_INHIBIT && optind == argc)
260 0 : arg_action = ACTION_LIST;
261 :
262 0 : else if (arg_action == ACTION_INHIBIT && optind >= argc)
263 0 : return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
264 : "Missing command line to execute.");
265 :
266 0 : return 1;
267 : }
268 :
269 4 : static int run(int argc, char *argv[]) {
270 4 : _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
271 : int r;
272 :
273 4 : log_show_color(true);
274 4 : log_parse_environment();
275 4 : log_open();
276 :
277 4 : r = parse_argv(argc, argv);
278 4 : if (r <= 0)
279 4 : return r;
280 :
281 0 : r = sd_bus_default_system(&bus);
282 0 : if (r < 0)
283 0 : return log_error_errno(r, "Failed to connect to bus: %m");
284 :
285 0 : if (arg_action == ACTION_LIST)
286 0 : return print_inhibitors(bus);
287 : else {
288 0 : _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
289 0 : _cleanup_strv_free_ char **arguments = NULL;
290 0 : _cleanup_free_ char *w = NULL;
291 0 : _cleanup_close_ int fd = -1;
292 : pid_t pid;
293 :
294 : /* Ignore SIGINT and allow the forked process to receive it */
295 0 : (void) ignore_signals(SIGINT, -1);
296 :
297 0 : if (!arg_who) {
298 0 : w = strv_join(argv + optind, " ");
299 0 : if (!w)
300 0 : return log_oom();
301 :
302 0 : arg_who = w;
303 : }
304 :
305 0 : if (!arg_mode)
306 0 : arg_mode = "block";
307 :
308 0 : fd = inhibit(bus, &error);
309 0 : if (fd < 0)
310 0 : return log_error_errno(fd, "Failed to inhibit: %s", bus_error_message(&error, fd));
311 :
312 0 : arguments = strv_copy(argv + optind);
313 0 : if (!arguments)
314 0 : return log_oom();
315 :
316 0 : r = safe_fork("(inhibit)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid);
317 0 : if (r < 0)
318 0 : return r;
319 0 : if (r == 0) {
320 : /* Child */
321 0 : execvp(arguments[0], arguments);
322 0 : log_open();
323 0 : log_error_errno(errno, "Failed to execute %s: %m", argv[optind]);
324 0 : _exit(EXIT_FAILURE);
325 : }
326 :
327 0 : return wait_for_terminate_and_check(argv[optind], pid, WAIT_LOG);
328 : }
329 : }
330 :
331 4 : DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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