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Sources/procd/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, exitcode:%d\n", proc->pid, ret);
124         proc->pid = 0;
125 
126         if (!dev_exist(a->id)) {
127                 DEBUG(4, "Skipping respawn: device '%s' does not exist anymore\n", a->id);
128                 return;
129         }
130 
131         uloop_timeout_set(&a->tout, a->respawn);
132 }
133 
134 static void respawn(struct uloop_timeout *tout)
135 {
136         struct init_action *a = container_of(tout, struct init_action, tout);
137         if (!a->proc.pid)
138                 fork_worker(a);
139 }
140 
141 static void rcdone(struct runqueue *q)
142 {
143         procd_state_next();
144 }
145 
146 static void runrc(struct init_action *a)
147 {
148         if (!a->argv[1] || !a->argv[2]) {
149                 ERROR("valid format is rcS <S|K> <param>\n");
150                 return;
151         }
152 
153         /* proceed even if no init or shutdown scripts run */
154         if (rcS(a->argv[1], a->argv[2], rcdone))
155                 rcdone(NULL);
156 }
157 
158 static void askfirst(struct init_action *a)
159 {
160         int i;
161 
162         if (!dev_exist(a->id) || (console && !strcmp(console, a->id))) {
163                 DEBUG(4, "Skipping %s\n", a->id);
164                 return;
165         }
166 
167         a->tout.cb = respawn;
168         /* shift arguments only if not yet done */
169         if (a->argv[0] != ask) {
170                 for (i = MAX_ARGS - 1; i >= 1; i--)
171                         a->argv[i] = a->argv[i - 1];
172                 a->argv[0] = ask;
173         }
174         a->respawn = 500;
175 
176         a->proc.cb = child_exit;
177         if (!a->proc.pid)
178                 fork_worker(a);
179 }
180 
181 static void askconsole(struct init_action *a)
182 {
183         char line[256], *tty, *split;
184         int i;
185 
186         tty = get_cmdline_val("console", line, sizeof(line));
187         if (tty != NULL) {
188                 split = strchr(tty, ',');
189                 if (split != NULL)
190                         *split = '\0';
191 
192                 if (!dev_exist(tty)) {
193                         DEBUG(4, "skipping %s\n", tty);
194                         return;
195                 }
196 
197                 console = strdup(tty);
198                 a->id = strdup(tty);
199         }
200         else {
201                 console = NULL;
202                 a->id = NULL;
203         }
204 
205         a->tout.cb = respawn;
206         /* shift arguments only if not yet done */
207         if (a->argv[0] != ask) {
208                 for (i = MAX_ARGS - 1; i >= 1; i--)
209                         a->argv[i] = a->argv[i - 1];
210                 a->argv[0] = ask;
211         }
212         a->respawn = 500;
213 
214         a->proc.cb = child_exit;
215         if (!a->proc.pid)
216                 fork_worker(a);
217 }
218 
219 static void rcrespawn(struct init_action *a)
220 {
221         a->tout.cb = respawn;
222         a->respawn = 500;
223 
224         a->proc.cb = child_exit;
225         if (!a->proc.pid)
226                 fork_worker(a);
227 }
228 
229 static struct init_handler handlers[] = {
230         {
231                 .name = "sysinit",
232                 .cb = runrc,
233         }, {
234                 .name = "shutdown",
235                 .cb = runrc,
236         }, {
237                 .name = "askfirst",
238                 .cb = askfirst,
239                 .multi = 1,
240         }, {
241                 .name = "askconsole",
242                 .cb = askconsole,
243                 .multi = 1,
244         }, {
245                 .name = "respawn",
246                 .cb = rcrespawn,
247                 .multi = 1,
248         }, {
249                 .name = "askconsolelate",
250                 .cb = askconsole,
251                 .multi = 1,
252         }, {
253                 .name = "respawnlate",
254                 .cb = rcrespawn,
255                 .multi = 1,
256         }
257 };
258 
259 static int add_action(struct init_action *a, const char *name)
260 {
261         int i;
262 
263         for (i = 0; i < ARRAY_SIZE(handlers); i++)
264                 if (!strcmp(handlers[i].name, name)) {
265                         a->handler = &handlers[i];
266                         list_add_tail(&a->list, &actions);
267                         return 0;
268                 }
269         ERROR("Unknown init handler %s\n", name);
270         return -1;
271 }
272 
273 void procd_inittab_run(const char *handler)
274 {
275         struct init_action *a;
276 
277         list_for_each_entry(a, &actions, list)
278                 if (!strcmp(a->handler->name, handler)) {
279                         a->handler->cb(a);
280                         if (!a->handler->multi)
281                                 break;
282                 }
283 }
284 
285 void procd_inittab(void)
286 {
287 #define LINE_LEN        128
288         FILE *fp = fopen(tab, "r");
289         struct init_action *a;
290         regex_t pat_inittab;
291         regmatch_t matches[5];
292         char *line;
293 
294         if (!fp) {
295                 ERROR("Failed to open %s: %m\n", tab);
296                 return;
297         }
298 
299         regcomp(&pat_inittab, "([a-zA-Z0-9]*):([a-zA-Z0-9]*):([a-zA-Z0-9]*):(.*)", REG_EXTENDED);
300         line = malloc(LINE_LEN);
301         a = calloc(1, sizeof(struct init_action));
302 
303         while (fgets(line, LINE_LEN, fp)) {
304                 char *tags[TAG_PROCESS + 1];
305                 char *tok;
306                 int i;
307                 int len = strlen(line);
308 
309                 while (isspace(line[len - 1]))
310                         len--;
311                 line[len] = 0;
312 
313                 if (*line == '#')
314                         continue;
315 
316                 if (regexec(&pat_inittab, line, 5, matches, 0))
317                         continue;
318 
319                 DEBUG(4, "Parsing inittab - %s\n", line);
320 
321                 for (i = TAG_ID; i <= TAG_PROCESS; i++) {
322                         line[matches[i].rm_eo] = '\0';
323                         tags[i] = &line[matches[i + 1].rm_so];
324                 };
325 
326                 tok = strtok(tags[TAG_PROCESS], " ");
327                 for (i = 0; i < (MAX_ARGS - 1) && tok; i++) {
328                         a->argv[i] = tok;
329                         tok = strtok(NULL, " ");
330                 }
331                 a->argv[i] = NULL;
332                 a->id = tags[TAG_ID];
333                 a->line = line;
334 
335                 if (add_action(a, tags[TAG_ACTION]))
336                         continue;
337                 line = malloc(LINE_LEN);
338                 a = calloc(1, sizeof(struct init_action));
339         }
340 
341         fclose(fp);
342         free(line);
343         free(a);
344         regfree(&pat_inittab);
345 }
346 

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