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Sources/procd/initd/preinit.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 #define _GNU_SOURCE
 15 
 16 #include <sys/stat.h>
 17 #include <sys/types.h>
 18 #include <sys/mount.h>
 19 #include <fcntl.h>
 20 
 21 #include <libubox/uloop.h>
 22 #include <libubox/utils.h>
 23 #include <libubus.h>
 24 
 25 #include <stdio.h>
 26 #include <stdlib.h>
 27 #include <unistd.h>
 28 
 29 #include "init.h"
 30 #include "../watchdog.h"
 31 #include "../sysupgrade.h"
 32 
 33 static struct uloop_process preinit_proc;
 34 static struct uloop_process plugd_proc;
 35 
 36 static void
 37 check_dbglvl(void)
 38 {
 39         FILE *fp = fopen("/tmp/debug_level", "r");
 40         int lvl = 0;
 41 
 42         if (!fp)
 43                 return;
 44         if (fscanf(fp, "%d", &lvl) == EOF)
 45                 ERROR("failed to read debug level: %m\n");
 46         fclose(fp);
 47         unlink("/tmp/debug_level");
 48 
 49         if (lvl > 0 && lvl < 5)
 50                 debug = lvl;
 51 }
 52 
 53 static void
 54 check_sysupgrade(void)
 55 {
 56         char *prefix = NULL, *path = NULL, *command = NULL;
 57         size_t n;
 58 
 59         if (chdir("/"))
 60                 return;
 61 
 62         FILE *sysupgrade = fopen("/tmp/sysupgrade", "r");
 63         if (!sysupgrade)
 64                 return;
 65 
 66         n = 0;
 67         if (getdelim(&prefix, &n, 0, sysupgrade) < 0)
 68                 goto fail;
 69         n = 0;
 70         if (getdelim(&path, &n, 0, sysupgrade) < 0)
 71                 goto fail;
 72         n = 0;
 73         if (getdelim(&command, &n, 0, sysupgrade) < 0)
 74                 goto fail;
 75 
 76         fclose(sysupgrade);
 77 
 78         sysupgrade_exec_upgraded(prefix, path, NULL, command, NULL);
 79 
 80         while (true)
 81                 sleep(1);
 82 
 83 fail:
 84         fclose(sysupgrade);
 85         free(prefix);
 86         free(path);
 87         free(command);
 88 }
 89 
 90 static void
 91 spawn_procd(struct uloop_process *proc, int ret)
 92 {
 93         char *wdt_fd = watchdog_fd();
 94         char *argv[] = { "/sbin/procd", NULL};
 95         char dbg[2];
 96 
 97         if (plugd_proc.pid > 0)
 98                 kill(plugd_proc.pid, SIGKILL);
 99 
100         unsetenv("INITRAMFS");
101         unsetenv("PREINIT");
102         unlink("/tmp/.preinit");
103 
104         check_sysupgrade();
105 
106         DEBUG(2, "Exec to real procd now\n");
107         if (wdt_fd)
108                 setenv("WDTFD", wdt_fd, 1);
109         check_dbglvl();
110         if (debug > 0) {
111                 snprintf(dbg, 2, "%d", debug);
112                 setenv("DBGLVL", dbg, 1);
113         }
114 
115         execvp(argv[0], argv);
116 }
117 
118 static void
119 plugd_proc_cb(struct uloop_process *proc, int ret)
120 {
121         proc->pid = 0;
122 }
123 
124 void
125 preinit(void)
126 {
127         char *init[] = { "/bin/sh", "/etc/preinit", NULL };
128         char *plug[] = { "/sbin/procd", "-h", "/etc/hotplug-preinit.json", NULL };
129         int fd;
130 
131         LOG("- preinit -\n");
132 
133         plugd_proc.cb = plugd_proc_cb;
134         plugd_proc.pid = fork();
135         if (!plugd_proc.pid) {
136                 execvp(plug[0], plug);
137                 ERROR("Failed to start plugd: %m\n");
138                 exit(EXIT_FAILURE);
139         }
140         if (plugd_proc.pid <= 0) {
141                 ERROR("Failed to start new plugd instance: %m\n");
142                 return;
143         }
144         uloop_process_add(&plugd_proc);
145 
146         setenv("PREINIT", "1", 1);
147 
148         fd = creat("/tmp/.preinit", 0600);
149 
150         if (fd < 0)
151                 ERROR("Failed to create sentinel file: %m\n");
152         else
153                 close(fd);
154 
155         preinit_proc.cb = spawn_procd;
156         preinit_proc.pid = fork();
157         if (!preinit_proc.pid) {
158                 execvp(init[0], init);
159                 ERROR("Failed to start preinit: %m\n");
160                 exit(EXIT_FAILURE);
161         }
162         if (preinit_proc.pid <= 0) {
163                 ERROR("Failed to start new preinit instance: %m\n");
164                 return;
165         }
166         uloop_process_add(&preinit_proc);
167 
168         DEBUG(4, "Launched preinit instance, pid=%d\n", (int) preinit_proc.pid);
169 }
170 

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