container: include stdbool.h
[project/procd.git] / inittab.c
1 /*
2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15 #define _GNU_SOURCE
16 #include <sys/types.h>
17 #include <sys/stat.h>
18 #include <sys/ioctl.h>
19
20 #include <fcntl.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <unistd.h>
24 #include <regex.h>
25 #include <ctype.h>
26
27 #include <libubox/utils.h>
28 #include <libubox/list.h>
29
30 #include "utils/utils.h"
31 #include "procd.h"
32 #include "rcS.h"
33
34 #ifndef O_PATH
35 #define O_PATH 010000000
36 #endif
37
38 #define TAG_ID 0
39 #define TAG_RUNLVL 1
40 #define TAG_ACTION 2
41 #define TAG_PROCESS 3
42
43 #define MAX_ARGS 8
44
45 struct init_action;
46 char *console = NULL;
47
48 struct init_handler {
49 const char *name;
50 void (*cb) (struct init_action *a);
51 int multi;
52 };
53
54 struct init_action {
55 struct list_head list;
56
57 char *id;
58 char *argv[MAX_ARGS];
59 char *line;
60
61 struct init_handler *handler;
62 struct uloop_process proc;
63
64 int respawn;
65 struct uloop_timeout tout;
66 };
67
68 static const char *tab = "/etc/inittab";
69 static char *ask = "/sbin/askfirst";
70
71 static LIST_HEAD(actions);
72
73 static int dev_exist(const char *dev)
74 {
75 int dfd, fd;
76
77 dfd = open("/dev", O_PATH|O_DIRECTORY);
78
79 if (dfd < 0)
80 return 0;
81
82 fd = openat(dfd, dev, O_RDONLY);
83 close(dfd);
84
85 if (fd < 0)
86 return 0;
87
88 close(fd);
89 return 1;
90 }
91
92 static void fork_worker(struct init_action *a)
93 {
94 pid_t p;
95
96 a->proc.pid = fork();
97 if (!a->proc.pid) {
98 p = setsid();
99
100 if (patch_stdio(a->id))
101 ERROR("Failed to setup i/o redirection\n");
102
103 ioctl(STDIN_FILENO, TIOCSCTTY, 1);
104 tcsetpgrp(STDIN_FILENO, p);
105
106 execvp(a->argv[0], a->argv);
107 ERROR("Failed to execute %s: %m\n", a->argv[0]);
108 exit(-1);
109 }
110
111 if (a->proc.pid > 0) {
112 DEBUG(4, "Launched new %s action, pid=%d\n",
113 a->handler->name,
114 (int) a->proc.pid);
115 uloop_process_add(&a->proc);
116 }
117 }
118
119 static void child_exit(struct uloop_process *proc, int ret)
120 {
121 struct init_action *a = container_of(proc, struct init_action, proc);
122
123 DEBUG(4, "pid:%d\n", proc->pid);
124 uloop_timeout_set(&a->tout, a->respawn);
125 }
126
127 static void respawn(struct uloop_timeout *tout)
128 {
129 struct init_action *a = container_of(tout, struct init_action, tout);
130 fork_worker(a);
131 }
132
133 static void rcdone(struct runqueue *q)
134 {
135 procd_state_next();
136 }
137
138 static void runrc(struct init_action *a)
139 {
140 if (!a->argv[1] || !a->argv[2]) {
141 ERROR("valid format is rcS <S|K> <param>\n");
142 return;
143 }
144
145 /* proceed even if no init or shutdown scripts run */
146 if (rcS(a->argv[1], a->argv[2], rcdone))
147 rcdone(NULL);
148 }
149
150 static void askfirst(struct init_action *a)
151 {
152 int i;
153
154 if (!dev_exist(a->id) || (console && !strcmp(console, a->id))) {
155 DEBUG(4, "Skipping %s\n", a->id);
156 return;
157 }
158
159 a->tout.cb = respawn;
160 for (i = MAX_ARGS - 1; i >= 1; i--)
161 a->argv[i] = a->argv[i - 1];
162 a->argv[0] = ask;
163 a->respawn = 500;
164
165 a->proc.cb = child_exit;
166 fork_worker(a);
167 }
168
169 static void askconsole(struct init_action *a)
170 {
171 char line[256], *tty, *split;
172 int i;
173
174 tty = get_cmdline_val("console", line, sizeof(line));
175 if (tty != NULL) {
176 split = strchr(tty, ',');
177 if (split != NULL)
178 *split = '\0';
179
180 if (!dev_exist(tty)) {
181 DEBUG(4, "skipping %s\n", tty);
182 return;
183 }
184
185 console = strdup(tty);
186 a->id = strdup(tty);
187 }
188 else {
189 console = NULL;
190 a->id = NULL;
191 }
192
193 a->tout.cb = respawn;
194 for (i = MAX_ARGS - 1; i >= 1; i--)
195 a->argv[i] = a->argv[i - 1];
196 a->argv[0] = ask;
197 a->respawn = 500;
198
199 a->proc.cb = child_exit;
200 fork_worker(a);
201 }
202
203 static void rcrespawn(struct init_action *a)
204 {
205 a->tout.cb = respawn;
206 a->respawn = 500;
207
208 a->proc.cb = child_exit;
209 fork_worker(a);
210 }
211
212 static struct init_handler handlers[] = {
213 {
214 .name = "sysinit",
215 .cb = runrc,
216 }, {
217 .name = "shutdown",
218 .cb = runrc,
219 }, {
220 .name = "askfirst",
221 .cb = askfirst,
222 .multi = 1,
223 }, {
224 .name = "askconsole",
225 .cb = askconsole,
226 .multi = 1,
227 }, {
228 .name = "respawn",
229 .cb = rcrespawn,
230 .multi = 1,
231 }, {
232 .name = "askconsolelate",
233 .cb = askconsole,
234 .multi = 1,
235 }, {
236 .name = "respawnlate",
237 .cb = rcrespawn,
238 .multi = 1,
239 }
240 };
241
242 static int add_action(struct init_action *a, const char *name)
243 {
244 int i;
245
246 for (i = 0; i < ARRAY_SIZE(handlers); i++)
247 if (!strcmp(handlers[i].name, name)) {
248 a->handler = &handlers[i];
249 list_add_tail(&a->list, &actions);
250 return 0;
251 }
252 ERROR("Unknown init handler %s\n", name);
253 return -1;
254 }
255
256 void procd_inittab_run(const char *handler)
257 {
258 struct init_action *a;
259
260 list_for_each_entry(a, &actions, list)
261 if (!strcmp(a->handler->name, handler)) {
262 if (a->handler->multi) {
263 a->handler->cb(a);
264 continue;
265 }
266 a->handler->cb(a);
267 break;
268 }
269 }
270
271 void procd_inittab(void)
272 {
273 #define LINE_LEN 128
274 FILE *fp = fopen(tab, "r");
275 struct init_action *a;
276 regex_t pat_inittab;
277 regmatch_t matches[5];
278 char *line;
279
280 if (!fp) {
281 ERROR("Failed to open %s: %m\n", tab);
282 return;
283 }
284
285 regcomp(&pat_inittab, "([a-zA-Z0-9]*):([a-zA-Z0-9]*):([a-zA-Z0-9]*):(.*)", REG_EXTENDED);
286 line = malloc(LINE_LEN);
287 a = calloc(1, sizeof(struct init_action));
288
289 while (fgets(line, LINE_LEN, fp)) {
290 char *tags[TAG_PROCESS + 1];
291 char *tok;
292 int i;
293 int len = strlen(line);
294
295 while (isspace(line[len - 1]))
296 len--;
297 line[len] = 0;
298
299 if (*line == '#')
300 continue;
301
302 if (regexec(&pat_inittab, line, 5, matches, 0))
303 continue;
304
305 DEBUG(4, "Parsing inittab - %s\n", line);
306
307 for (i = TAG_ID; i <= TAG_PROCESS; i++) {
308 line[matches[i].rm_eo] = '\0';
309 tags[i] = &line[matches[i + 1].rm_so];
310 };
311
312 tok = strtok(tags[TAG_PROCESS], " ");
313 for (i = 0; i < (MAX_ARGS - 1) && tok; i++) {
314 a->argv[i] = tok;
315 tok = strtok(NULL, " ");
316 }
317 a->argv[i] = NULL;
318 a->id = tags[TAG_ID];
319 a->line = line;
320
321 if (add_action(a, tags[TAG_ACTION]))
322 continue;
323 line = malloc(LINE_LEN);
324 a = calloc(1, sizeof(struct init_action));
325 }
326
327 fclose(fp);
328 free(line);
329 free(a);
330 regfree(&pat_inittab);
331 }