mirror of
https://github.com/sheumann/hush.git
synced 2024-08-20 04:28:57 +00:00
1165 lines
29 KiB
C
1165 lines
29 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini init implementation for busybox
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*
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*
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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* Adjusted by so many folks, it's impossible to keep track.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/* Turn this on to disable all the dangerous
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rebooting stuff when debugging.
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#define DEBUG_INIT
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include <limits.h>
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#include <sys/fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include "busybox.h"
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#ifdef CONFIG_SYSLOGD
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# include <sys/syslog.h>
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#endif
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#if defined(__UCLIBC__) && !defined(__UCLIBC_HAS_MMU__)
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#define fork vfork
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#endif
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/* From <linux/vt.h> */
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struct vt_stat {
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unsigned short v_active; /* active vt */
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unsigned short v_signal; /* signal to send */
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unsigned short v_state; /* vt bitmask */
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};
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static const int VT_GETSTATE = 0x5603; /* get global vt state info */
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/* From <linux/serial.h> */
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struct serial_struct {
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int type;
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int line;
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int port;
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int irq;
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int flags;
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int xmit_fifo_size;
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int custom_divisor;
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int baud_base;
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unsigned short close_delay;
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char reserved_char[2];
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int hub6;
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unsigned short closing_wait; /* time to wait before closing */
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unsigned short closing_wait2; /* no longer used... */
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int reserved[4];
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};
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#if (__GNU_LIBRARY__ > 5) || defined(__dietlibc__)
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#include <sys/reboot.h>
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#define init_reboot(magic) reboot(magic)
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#else
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#define init_reboot(magic) reboot(0xfee1dead, 672274793, magic)
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#endif
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#ifndef _PATH_STDPATH
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#define _PATH_STDPATH "/usr/bin:/bin:/usr/sbin:/sbin"
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#endif
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#if defined CONFIG_FEATURE_INIT_COREDUMPS
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/*
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* When a file named CORE_ENABLE_FLAG_FILE exists, setrlimit is called
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* before processes are spawned to set core file size as unlimited.
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* This is for debugging only. Don't use this is production, unless
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* you want core dumps lying about....
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*/
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#define CORE_ENABLE_FLAG_FILE "/.init_enable_core"
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#include <sys/resource.h>
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#include <sys/time.h>
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#endif
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#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
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#if __GNU_LIBRARY__ > 5
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#include <sys/kdaemon.h>
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#else
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extern int bdflush (int func, long int data);
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#endif
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#define SHELL "/bin/sh" /* Default shell */
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#define LOGIN_SHELL "-" SHELL /* Default login shell */
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#define INITTAB "/etc/inittab" /* inittab file location */
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#ifndef INIT_SCRIPT
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#define INIT_SCRIPT "/etc/init.d/rcS" /* Default sysinit script. */
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#endif
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#define MAXENV 16 /* Number of env. vars */
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/* Allowed init action types */
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#define SYSINIT 0x001
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#define RESPAWN 0x002
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#define ASKFIRST 0x004
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#define WAIT 0x008
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#define ONCE 0x010
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#define CTRLALTDEL 0x020
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#define SHUTDOWN 0x040
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#define RESTART 0x080
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/* A mapping between "inittab" action name strings and action type codes. */
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struct init_action_type {
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const char *name;
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int action;
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};
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static const struct init_action_type actions[] = {
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{"sysinit", SYSINIT},
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{"respawn", RESPAWN},
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{"askfirst", ASKFIRST},
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{"wait", WAIT},
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{"once", ONCE},
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{"ctrlaltdel", CTRLALTDEL},
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{"shutdown", SHUTDOWN},
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{"restart", RESTART},
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{0, 0}
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};
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/* Set up a linked list of init_actions, to be read from inittab */
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struct init_action {
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pid_t pid;
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char command[256];
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char terminal[256];
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struct init_action *next;
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int action;
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};
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/* Static variables */
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static struct init_action *init_action_list = NULL;
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static char *secondConsole = VC_2;
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static char *thirdConsole = VC_3;
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static char *fourthConsole = VC_4;
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static char *log = VC_5;
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static int kernelVersion = 0;
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static char termType[32] = "TERM=linux";
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static char console[32] = _PATH_CONSOLE;
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static sig_atomic_t got_cont = 0;
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static const int LOG = 0x1;
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static const int CONSOLE = 0x2;
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#if defined CONFIG_FEATURE_EXTRA_QUIET
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static const int MAYBE_CONSOLE = 0x0;
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#else
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#define MAYBE_CONSOLE CONSOLE
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#endif
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#ifndef RB_HALT_SYSTEM
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static const int RB_HALT_SYSTEM = 0xcdef0123;
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static const int RB_ENABLE_CAD = 0x89abcdef;
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static const int RB_DISABLE_CAD = 0;
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#define RB_POWER_OFF 0x4321fedc
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static const int RB_AUTOBOOT = 0x01234567;
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#endif
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/* Function prototypes */
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static void delete_init_action(struct init_action *a);
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static int waitfor(struct init_action *a);
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static void loop_forever(void)
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{
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while (1)
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sleep (1);
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}
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/* Print a message to the specified device.
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* Device may be bitwise-or'd from LOG | CONSOLE */
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#ifdef DEBUG_INIT
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static inline messageND(int device, char *fmt, ...) { }
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#else
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#define messageND message
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#endif
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static void message(int device, char *fmt, ...) __attribute__ ((format (printf, 2, 3)));
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static void message(int device, char *fmt, ...)
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{
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va_list arguments;
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int fd;
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#ifdef CONFIG_SYSLOGD
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/* Log the message to syslogd */
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if (device & LOG) {
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char msg[1024];
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va_start(arguments, fmt);
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vsnprintf(msg, sizeof(msg), fmt, arguments);
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va_end(arguments);
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syslog_msg(LOG_USER, LOG_INFO, msg);
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}
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#else
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static int log_fd = -1;
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/* Take full control of the log tty, and never close it.
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* It's mine, all mine! Muhahahaha! */
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if (log_fd < 0) {
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if (log == NULL) {
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/* don't even try to log, because there is no such console */
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log_fd = -2;
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/* log to main console instead */
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device = CONSOLE;
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} else if ((log_fd = device_open(log, O_RDWR|O_NDELAY)) < 0) {
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log_fd = -2;
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fprintf(stderr, "Bummer, can't write to log on %s!\n", log);
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log = NULL;
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device = CONSOLE;
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}
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}
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if ((device & LOG) && (log_fd >= 0)) {
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va_start(arguments, fmt);
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vdprintf(log_fd, fmt, arguments);
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va_end(arguments);
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}
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#endif
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if (device & CONSOLE) {
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/* Always send console messages to /dev/console so people will see them. */
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if (
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(fd =
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device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NDELAY)) >= 0) {
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va_start(arguments, fmt);
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vdprintf(fd, fmt, arguments);
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va_end(arguments);
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close(fd);
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} else {
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fprintf(stderr, "Bummer, can't print: ");
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va_start(arguments, fmt);
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vfprintf(stderr, fmt, arguments);
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va_end(arguments);
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}
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}
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}
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/* Set terminal settings to reasonable defaults */
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static void set_term(int fd)
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{
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struct termios tty;
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tcgetattr(fd, &tty);
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/* set control chars */
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tty.c_cc[VINTR] = 3; /* C-c */
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tty.c_cc[VQUIT] = 28; /* C-\ */
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tty.c_cc[VERASE] = 127; /* C-? */
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tty.c_cc[VKILL] = 21; /* C-u */
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tty.c_cc[VEOF] = 4; /* C-d */
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tty.c_cc[VSTART] = 17; /* C-q */
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tty.c_cc[VSTOP] = 19; /* C-s */
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tty.c_cc[VSUSP] = 26; /* C-z */
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/* use line dicipline 0 */
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tty.c_line = 0;
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/* Make it be sane */
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tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD;
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tty.c_cflag |= CREAD|HUPCL|CLOCAL;
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/* input modes */
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tty.c_iflag = ICRNL | IXON | IXOFF;
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/* output modes */
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tty.c_oflag = OPOST | ONLCR;
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/* local modes */
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tty.c_lflag =
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ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN;
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tcsetattr(fd, TCSANOW, &tty);
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}
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/* How much memory does this machine have?
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Units are kBytes to avoid overflow on 4GB machines */
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static int check_free_memory(void)
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{
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struct sysinfo info;
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unsigned int result, u, s=10;
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if (sysinfo(&info) != 0) {
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perror_msg("Error checking free memory");
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return -1;
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}
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/* Kernels 2.0.x and 2.2.x return info.mem_unit==0 with values in bytes.
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* Kernels 2.4.0 return info.mem_unit in bytes. */
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u = info.mem_unit;
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if (u==0) u=1;
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while ( (u&1) == 0 && s > 0 ) { u>>=1; s--; }
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result = (info.totalram>>s) + (info.totalswap>>s);
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result = result*u;
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if (result < 0) result = INT_MAX;
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return result;
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}
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static void console_init(void)
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{
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int fd;
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int tried_devcons = 0;
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int tried_vtprimary = 0;
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struct vt_stat vt;
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struct serial_struct sr;
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char *s;
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if ((s = getenv("TERM")) != NULL) {
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snprintf(termType, sizeof(termType) - 1, "TERM=%s", s);
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}
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if ((s = getenv("CONSOLE")) != NULL) {
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safe_strncpy(console, s, sizeof(console));
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}
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#if #cpu(sparc)
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/* sparc kernel supports console=tty[ab] parameter which is also
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* passed to init, so catch it here */
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else if ((s = getenv("console")) != NULL) {
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/* remap tty[ab] to /dev/ttyS[01] */
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if (strcmp(s, "ttya") == 0)
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safe_strncpy(console, SC_0, sizeof(console));
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else if (strcmp(s, "ttyb") == 0)
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safe_strncpy(console, SC_1, sizeof(console));
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}
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#endif
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else {
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/* 2.2 kernels: identify the real console backend and try to use it */
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if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
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/* this is a serial console */
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snprintf(console, sizeof(console) - 1, SC_FORMAT, sr.line);
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} else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
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/* this is linux virtual tty */
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snprintf(console, sizeof(console) - 1, VC_FORMAT, vt.v_active);
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} else {
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safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
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tried_devcons++;
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}
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}
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while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
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/* Can't open selected console -- try /dev/console */
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if (!tried_devcons) {
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tried_devcons++;
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safe_strncpy(console, _PATH_CONSOLE, sizeof(console));
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continue;
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}
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/* Can't open selected console -- try vt1 */
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if (!tried_vtprimary) {
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tried_vtprimary++;
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safe_strncpy(console, VC_1, sizeof(console));
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continue;
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}
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break;
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}
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if (fd < 0) {
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/* Perhaps we should panic here? */
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safe_strncpy(console, "/dev/null", sizeof(console));
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} else {
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/* check for serial console and disable logging to tty5 &
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* running a shell to tty2-4 */
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if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
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log = NULL;
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secondConsole = NULL;
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thirdConsole = NULL;
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fourthConsole = NULL;
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/* Force the TERM setting to vt102 for serial console --
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* iff TERM is set to linux (the default) */
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if (strcmp( termType, "TERM=linux" ) == 0)
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safe_strncpy(termType, "TERM=vt102", sizeof(termType));
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message(LOG | CONSOLE,
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"\rserial console detected. Disabling virtual terminals.\n");
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}
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close(fd);
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}
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message(LOG, "console=%s\n", console);
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}
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static void fixup_argv(int argc, char **argv, char *new_argv0)
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{
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int len;
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/* Fix up argv[0] to be certain we claim to be init */
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len = strlen(argv[0]);
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memset(argv[0], 0, len);
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safe_strncpy(argv[0], new_argv0, len + 1);
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/* Wipe argv[1]-argv[N] so they don't clutter the ps listing */
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len = 1;
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while (argc > len) {
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memset(argv[len], 0, strlen(argv[len]));
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len++;
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}
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}
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/* Make sure there is enough memory to do something useful. *
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* Calls "swapon -a" if needed so be sure /etc/fstab is present... */
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static void check_memory(void)
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{
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struct stat statBuf;
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|
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if (check_free_memory() > 1000)
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return;
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|
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#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
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if (stat("/etc/fstab", &statBuf) == 0) {
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/* swapon -a requires /proc typically */
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system("/bin/mount -t proc proc /proc");
|
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/* Try to turn on swap */
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system("/sbin/swapon -a");
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if (check_free_memory() < 1000)
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goto goodnight;
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} else
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goto goodnight;
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return;
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#endif
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goodnight:
|
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message(CONSOLE,
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"\rSorry, your computer does not have enough memory.\n");
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loop_forever();
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}
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|
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static pid_t run(struct init_action *a)
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{
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struct stat sb;
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int i, j, fd, junk;
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pid_t pid, pgrp, tmp_pid;
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char *s, *tmpCmd, *cmd[255], *cmdpath, buf[255];
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sigset_t nmask, omask;
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char *environment[MAXENV+1] = {
|
|
termType,
|
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"HOME=/",
|
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"PATH=" _PATH_STDPATH,
|
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"SHELL=" SHELL,
|
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"USER=root",
|
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NULL
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};
|
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static const char press_enter[] =
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#ifdef CUSTOMIZED_BANNER
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|
#include CUSTOMIZED_BANNER
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#endif
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"\nPlease press Enter to activate this console. ";
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|
|
/* inherit environment to the child, merging our values -andy */
|
|
for (i=0; environ[i]; i++) {
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for (j=0; environment[j]; j++) {
|
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s = strchr(environment[j], '=');
|
|
if (!strncmp(environ[i], environment[j], s - environment[j]))
|
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break;
|
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}
|
|
if (!environment[j]) {
|
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environment[j++] = environ[i];
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environment[j] = NULL;
|
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}
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}
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|
|
/* Block sigchild while forking. */
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sigemptyset(&nmask);
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sigaddset(&nmask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &nmask, &omask);
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|
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if ((pid = fork()) == 0)
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{
|
|
/* Clean up */
|
|
ioctl(0, TIOCNOTTY, 0);
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close(0);
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close(1);
|
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close(2);
|
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sigprocmask(SIG_SETMASK, &omask, NULL);
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|
|
/* Create a new session and make ourself the process group leader */
|
|
setsid();
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|
|
|
/* Reset signal handlers that were set by the parent process */
|
|
signal(SIGUSR1, SIG_DFL);
|
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signal(SIGUSR2, SIG_DFL);
|
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signal(SIGINT, SIG_DFL);
|
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signal(SIGTERM, SIG_DFL);
|
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signal(SIGHUP, SIG_DFL);
|
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signal(SIGCONT, SIG_DFL);
|
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signal(SIGSTOP, SIG_DFL);
|
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signal(SIGTSTP, SIG_DFL);
|
|
|
|
/* Open the new terminal device */
|
|
if ((fd = device_open(a->terminal, O_RDWR|O_NOCTTY)) < 0) {
|
|
if (stat(a->terminal, &sb) != 0) {
|
|
message(LOG | CONSOLE, "\rdevice '%s' does not exist.\n",
|
|
a->terminal);
|
|
_exit(1);
|
|
}
|
|
message(LOG | CONSOLE, "\rBummer, can't open %s\n", a->terminal);
|
|
_exit(1);
|
|
}
|
|
/* Make sure the terminal will act fairly normal for us */
|
|
set_term(0);
|
|
|
|
/* If the init Action requires up to wait, then force the
|
|
* supplied terminal to be the controlling tty. */
|
|
if (a->action & (SYSINIT|WAIT|CTRLALTDEL|SHUTDOWN|RESTART|ASKFIRST)) {
|
|
|
|
/* Take over the controlling tty */
|
|
ioctl(fd, TIOCSCTTY, 1);
|
|
/* Setup stdin, stdout, stderr for the new process so
|
|
* they point to the supplied terminal */
|
|
dup(fd);
|
|
dup(fd);
|
|
|
|
/* Now fork off another process to just hang around */
|
|
if ((pid = fork()) < 0) {
|
|
message(LOG | CONSOLE, "Can't fork!\n");
|
|
_exit(1);
|
|
}
|
|
|
|
if (pid > 0) {
|
|
|
|
/* We are the parent -- wait till the child is done */
|
|
signal(SIGINT, SIG_IGN);
|
|
signal(SIGTSTP, SIG_IGN);
|
|
signal(SIGQUIT, SIG_IGN);
|
|
signal(SIGCHLD, SIG_DFL);
|
|
|
|
/* Wait for child to exit */
|
|
while ((tmp_pid = waitpid(pid, &junk, 0)) != pid) {
|
|
if (tmp_pid < 0 && errno == ECHILD)
|
|
break;
|
|
}
|
|
|
|
/* See if stealing the controlling tty back is necessary */
|
|
pgrp = tcgetpgrp(tmp_pid);
|
|
if (pgrp != getpid())
|
|
_exit(0);
|
|
|
|
/* Use a temporary process to steal the controlling tty. */
|
|
if ((pid = fork()) < 0) {
|
|
message(LOG | CONSOLE, "\rCan't fork!\n");
|
|
_exit(1);
|
|
}
|
|
if (pid == 0) {
|
|
setsid();
|
|
ioctl(tmp_pid, TIOCSCTTY, 1);
|
|
_exit(0);
|
|
}
|
|
while((tmp_pid = waitpid(pid, &junk, 0)) != pid) {
|
|
if (tmp_pid < 0 && errno == ECHILD)
|
|
break;
|
|
}
|
|
_exit(0);
|
|
}
|
|
|
|
/* Now fall though to actually execute things */
|
|
} else {
|
|
dup(fd);
|
|
dup(fd);
|
|
}
|
|
|
|
/* See if any special /bin/sh requiring characters are present */
|
|
if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
|
|
cmd[0] = SHELL;
|
|
cmd[1] = "-c";
|
|
strcpy(buf, "exec ");
|
|
safe_strncpy(buf + sizeof("exec "), a->command,
|
|
sizeof(buf) - sizeof("exec "));
|
|
cmd[2] = buf;
|
|
cmd[3] = NULL;
|
|
} else {
|
|
/* Convert command (char*) into cmd (char**, one word per string) */
|
|
safe_strncpy(buf, a->command, sizeof(buf));
|
|
s = buf;
|
|
for (tmpCmd = buf, i = 0;
|
|
(tmpCmd = strsep(&s, " \t")) != NULL;) {
|
|
if (*tmpCmd != '\0') {
|
|
cmd[i] = tmpCmd;
|
|
tmpCmd++;
|
|
i++;
|
|
}
|
|
}
|
|
cmd[i] = NULL;
|
|
}
|
|
|
|
cmdpath = cmd[0];
|
|
|
|
/*
|
|
Interactive shells want to see a dash in argv[0]. This
|
|
typically is handled by login, argv will be setup this
|
|
way if a dash appears at the front of the command path
|
|
(like "-/bin/sh").
|
|
*/
|
|
|
|
if (*cmdpath == '-') {
|
|
|
|
/* skip over the dash */
|
|
++cmdpath;
|
|
|
|
/* find the last component in the command pathname */
|
|
s = get_last_path_component(cmdpath);
|
|
|
|
/* make a new argv[0] */
|
|
if ((cmd[0] = malloc(strlen(s)+2)) == NULL) {
|
|
message(LOG | CONSOLE, "malloc failed");
|
|
cmd[0] = cmdpath;
|
|
} else {
|
|
cmd[0][0] = '-';
|
|
strcpy(cmd[0]+1, s);
|
|
}
|
|
}
|
|
|
|
if (a->action & ASKFIRST) {
|
|
/*
|
|
* Save memory by not exec-ing anything large (like a shell)
|
|
* before the user wants it. This is critical if swap is not
|
|
* enabled and the system has low memory. Generally this will
|
|
* be run on the second virtual console, and the first will
|
|
* be allowed to start a shell or whatever an init script
|
|
* specifies.
|
|
*/
|
|
messageND(LOG, "Waiting for enter to start '%s' (pid %d, terminal %s)\n",
|
|
cmdpath, getpid(), a->terminal);
|
|
write(fileno(stdout), press_enter, sizeof(press_enter) - 1);
|
|
getc(stdin);
|
|
}
|
|
|
|
/* Log the process name and args */
|
|
messageND(LOG, "Starting pid %d, console %s: '%s'\n",
|
|
getpid(), a->terminal, cmdpath);
|
|
|
|
#if defined CONFIG_FEATURE_INIT_COREDUMPS
|
|
if (stat (CORE_ENABLE_FLAG_FILE, &sb) == 0) {
|
|
struct rlimit limit;
|
|
limit.rlim_cur = RLIM_INFINITY;
|
|
limit.rlim_max = RLIM_INFINITY;
|
|
setrlimit(RLIMIT_CORE, &limit);
|
|
}
|
|
#endif
|
|
|
|
/* Now run it. The new program will take over this PID,
|
|
* so nothing further in init.c should be run. */
|
|
execve(cmdpath, cmd, environment);
|
|
|
|
/* We're still here? Some error happened. */
|
|
message(LOG | CONSOLE, "\rBummer, could not run '%s': %s\n", cmdpath,
|
|
strerror(errno));
|
|
_exit(-1);
|
|
}
|
|
sigprocmask(SIG_SETMASK, &omask, NULL);
|
|
return pid;
|
|
}
|
|
|
|
static int waitfor(struct init_action *a)
|
|
{
|
|
int pid;
|
|
int status, wpid;
|
|
|
|
pid = run(a);
|
|
while (1) {
|
|
wpid = wait(&status);
|
|
if (wpid > 0 && wpid != pid) {
|
|
continue;
|
|
}
|
|
if (wpid == pid)
|
|
break;
|
|
}
|
|
return wpid;
|
|
}
|
|
|
|
/* Run all commands of a particular type */
|
|
static void run_actions(int action)
|
|
{
|
|
struct init_action *a, *tmp;
|
|
|
|
for (a = init_action_list; a; a = tmp) {
|
|
tmp = a->next;
|
|
if (a->action == action) {
|
|
if (a->action & (SYSINIT|WAIT|CTRLALTDEL|SHUTDOWN|RESTART)) {
|
|
waitfor(a);
|
|
delete_init_action(a);
|
|
} else if (a->action & ONCE) {
|
|
run(a);
|
|
delete_init_action(a);
|
|
} else if (a->action & (RESPAWN|ASKFIRST)) {
|
|
/* Only run stuff with pid==0. If they have
|
|
* a pid, that means it is still running */
|
|
if (a->pid == 0) {
|
|
a->pid = run(a);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
#ifndef DEBUG_INIT
|
|
static void shutdown_system(void)
|
|
{
|
|
sigset_t block_signals;
|
|
|
|
/* first disable all our signals */
|
|
sigemptyset(&block_signals);
|
|
sigaddset(&block_signals, SIGHUP);
|
|
sigaddset(&block_signals, SIGCHLD);
|
|
sigaddset(&block_signals, SIGUSR1);
|
|
sigaddset(&block_signals, SIGUSR2);
|
|
sigaddset(&block_signals, SIGINT);
|
|
sigaddset(&block_signals, SIGTERM);
|
|
sigaddset(&block_signals, SIGCONT);
|
|
sigaddset(&block_signals, SIGSTOP);
|
|
sigaddset(&block_signals, SIGTSTP);
|
|
sigprocmask(SIG_BLOCK, &block_signals, NULL);
|
|
|
|
/* Allow Ctrl-Alt-Del to reboot system. */
|
|
init_reboot(RB_ENABLE_CAD);
|
|
|
|
message(CONSOLE|LOG, "\n\rThe system is going down NOW !!\n");
|
|
sync();
|
|
|
|
/* Send signals to every process _except_ pid 1 */
|
|
message(CONSOLE|LOG, "\rSending SIGTERM to all processes.\n");
|
|
kill(-1, SIGTERM);
|
|
sleep(1);
|
|
sync();
|
|
|
|
message(CONSOLE|LOG, "\rSending SIGKILL to all processes.\n");
|
|
kill(-1, SIGKILL);
|
|
sleep(1);
|
|
|
|
/* run everything to be run at "shutdown" */
|
|
run_actions(SHUTDOWN);
|
|
|
|
sync();
|
|
if (kernelVersion > 0 && kernelVersion <= KERNEL_VERSION(2,2,11)) {
|
|
/* bdflush, kupdate not needed for kernels >2.2.11 */
|
|
bdflush(1, 0);
|
|
sync();
|
|
}
|
|
}
|
|
|
|
static void exec_signal(int sig)
|
|
{
|
|
struct init_action *a, *tmp;
|
|
for (a = init_action_list; a; a = tmp) {
|
|
tmp = a->next;
|
|
if (a->action & RESTART) {
|
|
shutdown_system();
|
|
message(CONSOLE|LOG, "\rTrying to re-exec %s\n", a->command);
|
|
execl(a->command, a->command, NULL);
|
|
|
|
message(CONSOLE|LOG, "\rexec of '%s' failed: %s\n",
|
|
a->command, sys_errlist[errno]);
|
|
sync();
|
|
sleep(2);
|
|
init_reboot(RB_HALT_SYSTEM);
|
|
loop_forever();
|
|
}
|
|
}
|
|
}
|
|
|
|
static void halt_signal(int sig)
|
|
{
|
|
shutdown_system();
|
|
message(CONSOLE|LOG,
|
|
#if #cpu(s390)
|
|
/* Seems the s390 console is Wierd(tm). */
|
|
"\rThe system is halted. You may reboot now.\n"
|
|
#else
|
|
/* secondConsole is NULL for a serial console */
|
|
"\rThe system is halted. Press %s or turn off power\n",
|
|
(secondConsole == NULL)? "Reset" : "CTRL-ALT-DEL"
|
|
#endif
|
|
);
|
|
sync();
|
|
|
|
/* allow time for last message to reach serial console */
|
|
sleep(2);
|
|
|
|
if (sig == SIGUSR2 && kernelVersion >= KERNEL_VERSION(2,2,0))
|
|
init_reboot(RB_POWER_OFF);
|
|
else
|
|
init_reboot(RB_HALT_SYSTEM);
|
|
|
|
loop_forever();
|
|
}
|
|
|
|
static void reboot_signal(int sig)
|
|
{
|
|
shutdown_system();
|
|
message(CONSOLE|LOG, "\rPlease stand by while rebooting the system.\n");
|
|
sync();
|
|
|
|
/* allow time for last message to reach serial console */
|
|
sleep(2);
|
|
|
|
init_reboot(RB_AUTOBOOT);
|
|
|
|
loop_forever();
|
|
}
|
|
|
|
static void ctrlaltdel_signal(int sig)
|
|
{
|
|
run_actions(CTRLALTDEL);
|
|
}
|
|
|
|
/* The SIGSTOP & SIGTSTP handler */
|
|
static void stop_handler(int sig)
|
|
{
|
|
int saved_errno = errno;
|
|
|
|
got_cont = 0;
|
|
while(!got_cont) pause();
|
|
got_cont = 0;
|
|
errno = saved_errno;
|
|
}
|
|
|
|
/* The SIGCONT handler */
|
|
static void cont_handler(int sig)
|
|
{
|
|
got_cont = 1;
|
|
}
|
|
|
|
#endif /* ! DEBUG_INIT */
|
|
|
|
static void new_init_action(int action, char *command, char *cons)
|
|
{
|
|
struct init_action *new_action, *a;
|
|
|
|
if (*cons == '\0')
|
|
cons = console;
|
|
|
|
/* If BusyBox detects that a serial console is in use, then entries
|
|
* not refering to the console or null devices will _not_ be run.
|
|
* The exception to this rule is the null device.
|
|
*/
|
|
if (secondConsole == NULL && strcmp(cons, console)
|
|
&& strcmp(cons, "/dev/null"))
|
|
return;
|
|
if (strcmp(cons, "/dev/null") == 0 && (action & ASKFIRST))
|
|
return;
|
|
|
|
new_action = calloc((size_t) (1), sizeof(struct init_action));
|
|
if (!new_action) {
|
|
message(LOG | CONSOLE, "\rMemory allocation failure\n");
|
|
loop_forever();
|
|
}
|
|
|
|
/* Append to the end of the list */
|
|
for (a = init_action_list; a && a->next; a = a->next) ;
|
|
if (a) {
|
|
a->next = new_action;
|
|
} else {
|
|
init_action_list = new_action;
|
|
}
|
|
safe_strncpy(new_action->command, command, 255);
|
|
new_action->action = action;
|
|
safe_strncpy(new_action->terminal, cons, 255);
|
|
new_action->pid = 0;
|
|
// message(LOG|CONSOLE, "command='%s' action='%d' terminal='%s'\n",
|
|
// new_action->command, new_action->action, new_action->terminal);
|
|
}
|
|
|
|
static void delete_init_action(struct init_action * action)
|
|
{
|
|
struct init_action *a, *b = NULL;
|
|
|
|
for (a = init_action_list; a; b = a, a = a->next) {
|
|
if (a == action) {
|
|
if (b == NULL) {
|
|
init_action_list = a->next;
|
|
} else {
|
|
b->next = a->next;
|
|
}
|
|
free(a);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
|
|
* then parse_inittab() simply adds in some default
|
|
* actions(i.e., runs INIT_SCRIPT and then starts a pair
|
|
* of "askfirst" shells). If CONFIG_FEATURE_USE_INITTAB
|
|
* _is_ defined, but /etc/inittab is missing, this
|
|
* results in the same set of default behaviors.
|
|
* */
|
|
static void parse_inittab(void)
|
|
{
|
|
#ifdef CONFIG_FEATURE_USE_INITTAB
|
|
FILE *file;
|
|
char buf[256], lineAsRead[256], tmpConsole[256];
|
|
char *id, *runlev, *action, *command, *eol;
|
|
const struct init_action_type *a = actions;
|
|
int foundIt;
|
|
|
|
|
|
file = fopen(INITTAB, "r");
|
|
if (file == NULL) {
|
|
/* No inittab file -- set up some default behavior */
|
|
#endif
|
|
/* Reboot on Ctrl-Alt-Del */
|
|
new_init_action(CTRLALTDEL, "/sbin/reboot", console);
|
|
/* Umount all filesystems on halt/reboot */
|
|
new_init_action(SHUTDOWN, "/bin/umount -a -r", console);
|
|
#if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
|
|
/* Swapoff on halt/reboot */
|
|
new_init_action(SHUTDOWN, "/sbin/swapoff -a", console);
|
|
#endif
|
|
/* Prepare to restart init when a HUP is received */
|
|
new_init_action(RESTART, "/sbin/init", console);
|
|
/* Askfirst shell on tty1 */
|
|
new_init_action(ASKFIRST, LOGIN_SHELL, console);
|
|
/* Askfirst shell on tty2 */
|
|
if (secondConsole != NULL)
|
|
new_init_action(ASKFIRST, LOGIN_SHELL, secondConsole);
|
|
/* Askfirst shell on tty3 */
|
|
if (thirdConsole != NULL)
|
|
new_init_action(ASKFIRST, LOGIN_SHELL, thirdConsole);
|
|
/* Askfirst shell on tty4 */
|
|
if (fourthConsole != NULL)
|
|
new_init_action(ASKFIRST, LOGIN_SHELL, fourthConsole);
|
|
/* sysinit */
|
|
new_init_action(SYSINIT, INIT_SCRIPT, console);
|
|
|
|
return;
|
|
#ifdef CONFIG_FEATURE_USE_INITTAB
|
|
}
|
|
|
|
while (fgets(buf, 255, file) != NULL) {
|
|
foundIt = FALSE;
|
|
/* Skip leading spaces */
|
|
for (id = buf; *id == ' ' || *id == '\t'; id++);
|
|
|
|
/* Skip the line if it's a comment */
|
|
if (*id == '#' || *id == '\n')
|
|
continue;
|
|
|
|
/* Trim the trailing \n */
|
|
eol = strrchr(id, '\n');
|
|
if (eol != NULL)
|
|
*eol = '\0';
|
|
|
|
/* Keep a copy around for posterity's sake (and error msgs) */
|
|
strcpy(lineAsRead, buf);
|
|
|
|
/* Separate the ID field from the runlevels */
|
|
runlev = strchr(id, ':');
|
|
if (runlev == NULL || *(runlev + 1) == '\0') {
|
|
message(LOG | CONSOLE, "\rBad inittab entry: %s\n", lineAsRead);
|
|
continue;
|
|
} else {
|
|
*runlev = '\0';
|
|
++runlev;
|
|
}
|
|
|
|
/* Separate the runlevels from the action */
|
|
action = strchr(runlev, ':');
|
|
if (action == NULL || *(action + 1) == '\0') {
|
|
message(LOG | CONSOLE, "\rBad inittab entry: %s\n", lineAsRead);
|
|
continue;
|
|
} else {
|
|
*action = '\0';
|
|
++action;
|
|
}
|
|
|
|
/* Separate the action from the command */
|
|
command = strchr(action, ':');
|
|
if (command == NULL || *(command + 1) == '\0') {
|
|
message(LOG | CONSOLE, "\rBad inittab entry: %s\n", lineAsRead);
|
|
continue;
|
|
} else {
|
|
*command = '\0';
|
|
++command;
|
|
}
|
|
|
|
/* Ok, now process it */
|
|
a = actions;
|
|
while (a->name != 0) {
|
|
if (strcmp(a->name, action) == 0) {
|
|
if (*id != '\0') {
|
|
strcpy(tmpConsole, "/dev/");
|
|
strncat(tmpConsole, id, 200);
|
|
id = tmpConsole;
|
|
}
|
|
new_init_action(a->action, command, id);
|
|
foundIt = TRUE;
|
|
}
|
|
a++;
|
|
}
|
|
if (foundIt == TRUE)
|
|
continue;
|
|
else {
|
|
/* Choke on an unknown action */
|
|
message(LOG | CONSOLE, "\rBad inittab entry: %s\n", lineAsRead);
|
|
}
|
|
}
|
|
return;
|
|
#endif /* CONFIG_FEATURE_USE_INITTAB */
|
|
}
|
|
|
|
|
|
|
|
extern int init_main(int argc, char **argv)
|
|
{
|
|
struct init_action *a;
|
|
pid_t wpid;
|
|
int status;
|
|
|
|
if (argc > 1 && !strcmp(argv[1], "-q")) {
|
|
/* don't assume init's pid == 1 */
|
|
long *pid = find_pid_by_name("init");
|
|
if (!pid || *pid<=0) {
|
|
pid = find_pid_by_name("linuxrc");
|
|
if (!pid || *pid<=0)
|
|
error_msg_and_die("no process killed");
|
|
}
|
|
kill(*pid, SIGHUP);
|
|
exit(0);
|
|
}
|
|
|
|
#ifndef DEBUG_INIT
|
|
/* Expect to be invoked as init with PID=1 or be invoked as linuxrc */
|
|
if (getpid() != 1
|
|
#ifdef CONFIG_FEATURE_INITRD
|
|
&& strstr(applet_name, "linuxrc") == NULL
|
|
#endif
|
|
)
|
|
{
|
|
show_usage();
|
|
}
|
|
/* Set up sig handlers -- be sure to
|
|
* clear all of these in run() */
|
|
signal(SIGHUP, exec_signal);
|
|
signal(SIGUSR1, halt_signal);
|
|
signal(SIGUSR2, halt_signal);
|
|
signal(SIGINT, ctrlaltdel_signal);
|
|
signal(SIGTERM, reboot_signal);
|
|
signal(SIGCONT, cont_handler);
|
|
signal(SIGSTOP, stop_handler);
|
|
signal(SIGTSTP, stop_handler);
|
|
|
|
/* Turn off rebooting via CTL-ALT-DEL -- we get a
|
|
* SIGINT on CAD so we can shut things down gracefully... */
|
|
init_reboot(RB_DISABLE_CAD);
|
|
#endif
|
|
|
|
/* Figure out what kernel this is running */
|
|
kernelVersion = get_kernel_revision();
|
|
|
|
/* Close whatever files are open, and reset the console. */
|
|
close(0);
|
|
close(1);
|
|
close(2);
|
|
|
|
/* Figure out where the default console should be */
|
|
console_init();
|
|
|
|
set_term(0);
|
|
chdir("/");
|
|
setsid();
|
|
|
|
/* Make sure PATH is set to something sane */
|
|
putenv("PATH="_PATH_STDPATH);
|
|
|
|
/* Hello world */
|
|
message(MAYBE_CONSOLE|LOG, "\rinit started: %s\n", full_version);
|
|
|
|
/* Make sure there is enough memory to do something useful. */
|
|
check_memory();
|
|
|
|
/* Check if we are supposed to be in single user mode */
|
|
if (argc > 1 && (!strcmp(argv[1], "single") ||
|
|
!strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
|
|
/* Ask first then start a shell on tty2-4 */
|
|
if (secondConsole != NULL)
|
|
new_init_action(ASKFIRST, LOGIN_SHELL, secondConsole);
|
|
if (thirdConsole != NULL)
|
|
new_init_action(ASKFIRST, LOGIN_SHELL, thirdConsole);
|
|
if (fourthConsole != NULL)
|
|
new_init_action(ASKFIRST, LOGIN_SHELL, fourthConsole);
|
|
/* Start a shell on tty1 */
|
|
new_init_action(RESPAWN, LOGIN_SHELL, console);
|
|
} else {
|
|
/* Not in single user mode -- see what inittab says */
|
|
|
|
/* NOTE that if CONFIG_FEATURE_USE_INITTAB is NOT defined,
|
|
* then parse_inittab() simply adds in some default
|
|
* actions(i.e., runs INIT_SCRIPT and then starts a pair
|
|
* of "askfirst" shells */
|
|
parse_inittab();
|
|
}
|
|
|
|
/* Make the command line just say "init" -- thats all, nothing else */
|
|
fixup_argv(argc, argv, "init");
|
|
|
|
/* Now run everything that needs to be run */
|
|
|
|
/* First run the sysinit command */
|
|
run_actions(SYSINIT);
|
|
|
|
/* Next run anything that wants to block */
|
|
run_actions(WAIT);
|
|
|
|
/* Next run anything to be run only once */
|
|
run_actions(ONCE);
|
|
|
|
/* If there is nothing else to do, stop */
|
|
if (init_action_list == NULL) {
|
|
message(LOG | CONSOLE, "\rNo more tasks for init -- sleeping forever.\n");
|
|
loop_forever();
|
|
}
|
|
|
|
/* Now run the looping stuff for the rest of forever */
|
|
while (1) {
|
|
/* run the respawn stuff */
|
|
run_actions(RESPAWN);
|
|
|
|
/* run the askfirst stuff */
|
|
run_actions(ASKFIRST);
|
|
|
|
/* Don't consume all CPU time -- sleep a bit */
|
|
sleep(1);
|
|
|
|
/* Wait for a child process to exit */
|
|
wpid = wait(&status);
|
|
if (wpid > 0) {
|
|
/* Find out who died and clean up their corpse */
|
|
for (a = init_action_list; a; a = a->next) {
|
|
if (a->pid == wpid) {
|
|
/* Set the pid to 0 so that the process gets
|
|
* restarted by run_actions() */
|
|
a->pid = 0;
|
|
message(LOG, "Process '%s' (pid %d) exited. "
|
|
"Scheduling it for restart.\n", a->command, wpid);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
Local Variables:
|
|
c-file-style: "linux"
|
|
c-basic-offset: 4
|
|
tab-width: 4
|
|
End:
|
|
*/
|