| 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. All advertising materials mentioning features or use of this software |
| 17 | * must display the following acknowledgement: |
| 18 | * This product includes software developed by the University of |
| 19 | * California, Berkeley and its contributors. |
| 20 | * 4. Neither the name of the University nor the names of its contributors |
| 21 | * may be used to endorse or promote products derived from this software |
| 22 | * without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 34 | * SUCH DAMAGE. |
| 35 | * |
| 36 | * @(#) Copyright (c) 1991, 1993 The Regents of the University of California. All rights reserved. |
| 37 | * @(#)init.c 8.1 (Berkeley) 7/15/93 |
| 38 | * $FreeBSD: src/sbin/init/init.c,v 1.38.2.8 2001/10/22 11:27:32 des Exp $ |
| 39 | */ |
| 40 | |
| 41 | #include <sys/param.h> |
| 42 | #include <sys/ioctl.h> |
| 43 | #include <sys/mount.h> |
| 44 | #include <sys/sysctl.h> |
| 45 | #include <sys/wait.h> |
| 46 | #include <sys/stat.h> |
| 47 | |
| 48 | #include <db.h> |
| 49 | #include <errno.h> |
| 50 | #include <fcntl.h> |
| 51 | #include <libutil.h> |
| 52 | #include <paths.h> |
| 53 | #include <signal.h> |
| 54 | #include <stdio.h> |
| 55 | #include <stdlib.h> |
| 56 | #include <string.h> |
| 57 | #include <syslog.h> |
| 58 | #include <time.h> |
| 59 | #include <ttyent.h> |
| 60 | #include <unistd.h> |
| 61 | #include <sys/reboot.h> |
| 62 | #include <err.h> |
| 63 | |
| 64 | #include <stdarg.h> |
| 65 | |
| 66 | #include "pathnames.h" |
| 67 | |
| 68 | static int setctty(const char *); |
| 69 | static void runcom(char **); |
| 70 | |
| 71 | /* |
| 72 | * The mother of all processes. |
| 73 | */ |
| 74 | int |
| 75 | main(int argc __unused, char **argv) |
| 76 | { |
| 77 | /* Dispose of random users. */ |
| 78 | if (getuid() != 0) |
| 79 | errx(1, "%s", strerror(EPERM)); |
| 80 | |
| 81 | runcom(argv); |
| 82 | return 1; |
| 83 | } |
| 84 | |
| 85 | static int |
| 86 | setctty(const char *name) |
| 87 | { |
| 88 | int fd; |
| 89 | |
| 90 | revoke(name); |
| 91 | if ((fd = open(name, O_RDWR)) == -1) { |
| 92 | exit(1); |
| 93 | } |
| 94 | |
| 95 | if (login_tty(fd) == -1) { |
| 96 | exit(1); |
| 97 | } |
| 98 | |
| 99 | return fd; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | static void |
| 104 | runcom(char **argv_orig) |
| 105 | { |
| 106 | pid_t pid, wpid; |
| 107 | int status, fd, error; |
| 108 | const char *argv[4]; |
| 109 | struct sigaction sa; |
| 110 | |
| 111 | fd = -1; |
| 112 | |
| 113 | if ((pid = fork()) == 0) { |
| 114 | sigemptyset(&sa.sa_mask); |
| 115 | sa.sa_flags = 0; |
| 116 | sa.sa_handler = SIG_IGN; |
| 117 | sigaction(SIGTSTP, &sa, NULL); |
| 118 | sigaction(SIGHUP, &sa, NULL); |
| 119 | |
| 120 | setctty(_PATH_CONSOLE); |
| 121 | |
| 122 | argv[0] = "sh"; |
| 123 | argv[1] = _PATH_RUNCOM; |
| 124 | argv[2] = "autoboot" ; |
| 125 | argv[3] = 0; |
| 126 | |
| 127 | sigprocmask(SIG_SETMASK, &sa.sa_mask, NULL); |
| 128 | |
| 129 | execv(_PATH_BSHELL, __DECONST(char **, argv)); |
| 130 | exit(1); /* force single user mode */ |
| 131 | } |
| 132 | |
| 133 | do { |
| 134 | wpid = waitpid(-1, &status, WUNTRACED); |
| 135 | } while (wpid != pid); |
| 136 | |
| 137 | error = chroot_kernel("/new_root"); |
| 138 | if (error) |
| 139 | exit(1); |
| 140 | |
| 141 | error = chroot("/new_root"); |
| 142 | if (error) |
| 143 | exit(1); |
| 144 | |
| 145 | execv("/sbin/init", __DECONST(char **, argv_orig)); |
| 146 | } |
| 147 | |