Unix/ventoy_unix_src/DragonFly/oinit.c

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Donn Seeley at Berkeley Software Design, Inc.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * @(#) Copyright (c) 1991, 1993 The Regents of the University of California.  All rights reserved.
  33  * @(#)init.c   8.1 (Berkeley) 7/15/93
  34  * $FreeBSD: src/sbin/init/init.c,v 1.38.2.8 2001/10/22 11:27:32 des Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/mount.h>
  40 #include <sys/sysctl.h>
  41 #include <sys/wait.h>
  42 #include <sys/stat.h>
  43
  44 #include <db.h>
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <libutil.h>
  48 #include <paths.h>
  49 #include <signal.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <syslog.h>
  54 #include <time.h>
  55 #include <ttyent.h>
  56 #include <unistd.h>
  57 #include <sys/reboot.h>
  58 #include <sys/mount.h>
  59 #include <err.h>
  60
  61 #include <stdarg.h>
  62 #include <vtutil.h>
  63
  64 int boot_verbose = 0;
  65
  66 int prepare_dmtable(void);
  67 int mount_cd9660(char *dev, char *dir);
  68 int mount_null(const char *src, const char *dst);
  69 int mount_tmpfs(int argc, char *argv[]);
  70
  71 static int setctty(const char *name)
  72 {
  73         int fd;
  74
  75         revoke(name);
  76         if ((fd = open(name, O_RDWR)) == -1) {
  77                 exit(1);
  78         }
  79
  80         if (login_tty(fd) == -1) {
  81                 exit(1);
  82         }
  83
  84         return fd;
  85 }
  86
  87 static void ventoy_init(char **argv_orig)
  88 {
  89         pid_t pid, wpid;
  90         int status, error;
  91     char arg0[MAXPATHLEN];
  92     char arg1[MAXPATHLEN];
  93     char arg2[MAXPATHLEN];
  94         char *argv[8];
  95         struct sigaction sa;
  96
  97     /* step1: mount tmpfs */
  98     vdebug("[VTOY] step 1: mount tmpfs ...");
  99     strcpy(arg0, "mount_tmpfs");
 100     strcpy(arg1, "tmpfs");
 101     strcpy(arg2, "/tmp");
 102     argv[0] = arg0;
 103     argv[1] = arg1;
 104     argv[2] = arg2;
 105     argv[3] = NULL;
 106     error = mount_tmpfs(3, argv);
 107     vdebug(" %d\n", error);
 108
 109     /* step 2: prepare dmtable */
 110     vdebug("[VTOY] step 2: prepare device-mapper table...\n");
 111     (void)prepare_dmtable();
 112
 113     /* step 3: create device mapper */
 114     vdebug("[VTOY] step 3: create device-mapper ...\n");
 115         if ((pid = fork()) == 0) {
 116                 sigemptyset(&sa.sa_mask);
 117                 sa.sa_flags = 0;
 118                 sa.sa_handler = SIG_IGN;
 119                 sigaction(SIGTSTP, &sa, NULL);
 120                 sigaction(SIGHUP, &sa, NULL);
 121
 122                 argv[0] = "dmsetup";
 123                 argv[1] = "create";
 124                 argv[2] = "ventoy";
 125                 argv[3] = "/tmp/dmtable";
 126                 argv[4] = "--readonly";
 127                 argv[5] = NULL;
 128
 129                 sigprocmask(SIG_SETMASK, &sa.sa_mask, NULL);
 130                 execv("/sbin/dmsetup", __DECONST(char **, argv));
 131                 exit(1); /* force single user mode */
 132         }
 133
 134         do {
 135                 wpid = waitpid(-1, &status, WUNTRACED);
 136         } while (wpid != pid);
 137
 138     /* step 4: mount iso */
 139     vdebug("[VTOY] step 4: mount device-mapper ...");
 140     strcpy(arg0, "/dev/mapper/ventoy");
 141     strcpy(arg1, "/new_root");
 142     error = mount_cd9660(arg0, arg1);
 143     vdebug(" %d\n", error);
 144
 145     /* step 5: mount devfs */
 146     vdebug("[VTOY] step 5: mount devfs ...");
 147     strcpy(arg0, "/dev");
 148     strcpy(arg1, "/new_root/dev");
 149     mount_null(arg0, arg1);
 150     vdebug(" %d\n", error);
 151
 152     /* step 6: umount tmpfs */
 153     error = unmount("/tmp", 0);
 154     vdebug("[VTOY] step 6: unmount tmpfs %d\n", error);
 155
 156     /* step 7: swich_root */
 157     vdebug("[VTOY] step 7: switch root ...\n");
 158         error = chdir("/new_root");
 159         if (error)
 160         {
 161             printf("[VTOY] chdir /new_root failed %d\n", error);
 162             goto chroot_failed;
 163     }
 164
 165         error = chroot_kernel("/new_root");
 166         if (error)
 167         {
 168             printf("[VTOY] chroot_kernel /new_root failed %d\n", error);
 169             goto chroot_failed;
 170     }
 171
 172         error = chroot("/new_root");
 173         if (error)
 174     {
 175         printf("[VTOY] chroot /new_root failed %d\n", error);
 176         goto chroot_failed;
 177     }
 178
 179     vdebug("[VTOY] step 8: now run /sbin/init ...\n");
 180         execv("/sbin/init", __DECONST(char **, argv_orig));
 181
 182         /* We failed to exec /sbin/init in the chroot, sleep forever */
 183 chroot_failed:
 184     printf("[VTOY] ################### DEAD ################\n");
 185         while(1) {
 186                 sleep(3);
 187         };
 188 }
 189
 190 int main(int argc __unused, char **argv)
 191 {
 192     size_t varsize = sizeof(int);
 193
 194         /* Dispose of random users. */
 195         if (getuid() != 0)
 196                 errx(1, "%s", strerror(EPERM));
 197
 198         /* Init is not allowed to die, it would make the kernel panic */
 199         signal(SIGTERM, SIG_IGN);
 200
 201     setctty(_PATH_CONSOLE);
 202
 203     sysctlbyname("debug.bootverbose", &boot_verbose, &varsize, NULL, 0);
 204
 205     vdebug("======= Ventoy Init Start ========\n");
 206
 207         ventoy_init(argv);
 208         return 1;
 209 }
 210