it via kern.proc.pathname sysctl(2). In some cases - booting from NFS or rerooting after replacing the init binary with a new one - the sysctl would fail. In other cases - after upgrading, which moves the old init to /sbin/init.bak - it would return /sbin/init.bak, which is the actual path of the running init, instead of /sbin/init. Reported by: Melissa Jenkins <melissa-freebsd at littlebluecar.co.uk>, jilles@ MFC after: 1 month Sponsored by: The FreeBSD Foundation
1990 lines
44 KiB
C
1990 lines
44 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Donn Seeley at Berkeley Software Design, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1991, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)init.c 8.1 (Berkeley) 7/15/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <sys/sysctl.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <db.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <kenv.h>
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#include <libutil.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <ttyent.h>
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#include <unistd.h>
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#include <sys/reboot.h>
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#include <err.h>
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#include <stdarg.h>
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#ifdef SECURE
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#include <pwd.h>
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#endif
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#ifdef LOGIN_CAP
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#include <login_cap.h>
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#endif
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#include "mntopts.h"
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#include "pathnames.h"
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/*
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* Sleep times; used to prevent thrashing.
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*/
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#define GETTY_SPACING 5 /* N secs minimum getty spacing */
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#define GETTY_SLEEP 30 /* sleep N secs after spacing problem */
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#define GETTY_NSPACE 3 /* max. spacing count to bring reaction */
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#define WINDOW_WAIT 3 /* wait N secs after starting window */
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#define STALL_TIMEOUT 30 /* wait N secs after warning */
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#define DEATH_WATCH 10 /* wait N secs for procs to die */
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#define DEATH_SCRIPT 120 /* wait for 2min for /etc/rc.shutdown */
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#define RESOURCE_RC "daemon"
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#define RESOURCE_WINDOW "default"
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#define RESOURCE_GETTY "default"
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static void handle(sig_t, ...);
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static void delset(sigset_t *, ...);
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static void stall(const char *, ...) __printflike(1, 2);
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static void warning(const char *, ...) __printflike(1, 2);
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static void emergency(const char *, ...) __printflike(1, 2);
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static void disaster(int);
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static void badsys(int);
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static void revoke_ttys(void);
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static int runshutdown(void);
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static char *strk(char *);
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/*
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* We really need a recursive typedef...
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* The following at least guarantees that the return type of (*state_t)()
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* is sufficiently wide to hold a function pointer.
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*/
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typedef long (*state_func_t)(void);
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typedef state_func_t (*state_t)(void);
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static state_func_t single_user(void);
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static state_func_t runcom(void);
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static state_func_t read_ttys(void);
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static state_func_t multi_user(void);
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static state_func_t clean_ttys(void);
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static state_func_t catatonia(void);
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static state_func_t death(void);
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static state_func_t death_single(void);
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static state_func_t reroot(void);
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static state_func_t reroot_phase_two(void);
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static state_func_t run_script(const char *);
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static enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT;
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#define FALSE 0
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#define TRUE 1
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static int Reboot = FALSE;
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static int howto = RB_AUTOBOOT;
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static int devfs;
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static char *init_path_argv0;
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static void transition(state_t);
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static state_t requested_transition;
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static state_t current_state = death_single;
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static void open_console(void);
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static const char *get_shell(void);
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static void write_stderr(const char *message);
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typedef struct init_session {
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pid_t se_process; /* controlling process */
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time_t se_started; /* used to avoid thrashing */
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int se_flags; /* status of session */
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#define SE_SHUTDOWN 0x1 /* session won't be restarted */
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#define SE_PRESENT 0x2 /* session is in /etc/ttys */
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int se_nspace; /* spacing count */
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char *se_device; /* filename of port */
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char *se_getty; /* what to run on that port */
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char *se_getty_argv_space; /* pre-parsed argument array space */
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char **se_getty_argv; /* pre-parsed argument array */
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char *se_window; /* window system (started only once) */
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char *se_window_argv_space; /* pre-parsed argument array space */
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char **se_window_argv; /* pre-parsed argument array */
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char *se_type; /* default terminal type */
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struct init_session *se_prev;
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struct init_session *se_next;
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} session_t;
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static void free_session(session_t *);
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static session_t *new_session(session_t *, struct ttyent *);
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static session_t *sessions;
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static char **construct_argv(char *);
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static void start_window_system(session_t *);
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static void collect_child(pid_t);
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static pid_t start_getty(session_t *);
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static void transition_handler(int);
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static void alrm_handler(int);
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static void setsecuritylevel(int);
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static int getsecuritylevel(void);
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static int setupargv(session_t *, struct ttyent *);
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#ifdef LOGIN_CAP
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static void setprocresources(const char *);
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#endif
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static int clang;
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static int start_session_db(void);
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static void add_session(session_t *);
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static void del_session(session_t *);
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static session_t *find_session(pid_t);
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static DB *session_db;
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/*
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* The mother of all processes.
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*/
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int
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main(int argc, char *argv[])
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{
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state_t initial_transition = runcom;
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char kenv_value[PATH_MAX];
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int c, error;
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struct sigaction sa;
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sigset_t mask;
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/* Dispose of random users. */
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if (getuid() != 0)
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errx(1, "%s", strerror(EPERM));
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/* System V users like to reexec init. */
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if (getpid() != 1) {
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#ifdef COMPAT_SYSV_INIT
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/* So give them what they want */
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if (argc > 1) {
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if (strlen(argv[1]) == 1) {
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char runlevel = *argv[1];
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int sig;
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switch (runlevel) {
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case '0': /* halt + poweroff */
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sig = SIGUSR2;
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break;
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case '1': /* single-user */
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sig = SIGTERM;
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break;
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case '6': /* reboot */
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sig = SIGINT;
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break;
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case 'c': /* block further logins */
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sig = SIGTSTP;
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break;
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case 'q': /* rescan /etc/ttys */
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sig = SIGHUP;
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break;
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case 'r': /* remount root */
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sig = SIGEMT;
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break;
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default:
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goto invalid;
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}
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kill(1, sig);
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_exit(0);
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} else
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invalid:
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errx(1, "invalid run-level ``%s''", argv[1]);
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} else
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#endif
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errx(1, "already running");
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}
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init_path_argv0 = strdup(argv[0]);
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if (init_path_argv0 == NULL)
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err(1, "strdup");
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/*
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* Note that this does NOT open a file...
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* Does 'init' deserve its own facility number?
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*/
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openlog("init", LOG_CONS, LOG_AUTH);
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/*
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* Create an initial session.
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*/
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if (setsid() < 0 && (errno != EPERM || getsid(0) != 1))
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warning("initial setsid() failed: %m");
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/*
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* Establish an initial user so that programs running
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* single user do not freak out and die (like passwd).
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*/
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if (setlogin("root") < 0)
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warning("setlogin() failed: %m");
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/*
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* This code assumes that we always get arguments through flags,
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* never through bits set in some random machine register.
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*/
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while ((c = getopt(argc, argv, "dsfr")) != -1)
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switch (c) {
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case 'd':
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devfs = 1;
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break;
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case 's':
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initial_transition = single_user;
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break;
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case 'f':
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runcom_mode = FASTBOOT;
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break;
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case 'r':
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initial_transition = reroot_phase_two;
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break;
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default:
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warning("unrecognized flag '-%c'", c);
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break;
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}
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if (optind != argc)
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warning("ignoring excess arguments");
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/*
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* We catch or block signals rather than ignore them,
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* so that they get reset on exec.
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*/
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handle(badsys, SIGSYS, 0);
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handle(disaster, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGXCPU,
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SIGXFSZ, 0);
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handle(transition_handler, SIGHUP, SIGINT, SIGEMT, SIGTERM, SIGTSTP,
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SIGUSR1, SIGUSR2, 0);
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handle(alrm_handler, SIGALRM, 0);
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sigfillset(&mask);
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delset(&mask, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGSYS,
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SIGXCPU, SIGXFSZ, SIGHUP, SIGINT, SIGEMT, SIGTERM, SIGTSTP,
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SIGALRM, SIGUSR1, SIGUSR2, 0);
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sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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sa.sa_handler = SIG_IGN;
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sigaction(SIGTTIN, &sa, (struct sigaction *)0);
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sigaction(SIGTTOU, &sa, (struct sigaction *)0);
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/*
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* Paranoia.
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*/
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close(0);
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close(1);
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close(2);
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if (kenv(KENV_GET, "init_script", kenv_value, sizeof(kenv_value)) > 0) {
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state_func_t next_transition;
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if ((next_transition = run_script(kenv_value)) != 0)
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initial_transition = (state_t) next_transition;
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}
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if (kenv(KENV_GET, "init_chroot", kenv_value, sizeof(kenv_value)) > 0) {
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if (chdir(kenv_value) != 0 || chroot(".") != 0)
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warning("Can't chroot to %s: %m", kenv_value);
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}
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/*
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* Additional check if devfs needs to be mounted:
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* If "/" and "/dev" have the same device number,
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* then it hasn't been mounted yet.
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*/
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if (!devfs) {
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struct stat stst;
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dev_t root_devno;
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stat("/", &stst);
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root_devno = stst.st_dev;
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if (stat("/dev", &stst) != 0)
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warning("Can't stat /dev: %m");
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else if (stst.st_dev == root_devno)
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devfs++;
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}
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if (devfs) {
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struct iovec iov[4];
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char *s;
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int i;
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char _fstype[] = "fstype";
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char _devfs[] = "devfs";
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char _fspath[] = "fspath";
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char _path_dev[]= _PATH_DEV;
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iov[0].iov_base = _fstype;
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iov[0].iov_len = sizeof(_fstype);
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iov[1].iov_base = _devfs;
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iov[1].iov_len = sizeof(_devfs);
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iov[2].iov_base = _fspath;
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iov[2].iov_len = sizeof(_fspath);
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/*
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* Try to avoid the trailing slash in _PATH_DEV.
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* Be *very* defensive.
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*/
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s = strdup(_PATH_DEV);
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if (s != NULL) {
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i = strlen(s);
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if (i > 0 && s[i - 1] == '/')
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s[i - 1] = '\0';
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iov[3].iov_base = s;
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iov[3].iov_len = strlen(s) + 1;
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} else {
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iov[3].iov_base = _path_dev;
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iov[3].iov_len = sizeof(_path_dev);
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}
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nmount(iov, 4, 0);
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if (s != NULL)
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free(s);
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}
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if (initial_transition != reroot_phase_two) {
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/*
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* Unmount reroot leftovers. This runs after init(8)
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* gets reexecuted after reroot_phase_two() is done.
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*/
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error = unmount(_PATH_REROOT, MNT_FORCE);
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if (error != 0 && errno != EINVAL)
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warning("Cannot unmount %s: %m", _PATH_REROOT);
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}
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/*
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* Start the state machine.
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*/
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transition(initial_transition);
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/*
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* Should never reach here.
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*/
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return 1;
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}
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/*
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* Associate a function with a signal handler.
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|
*/
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static void
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handle(sig_t handler, ...)
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{
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int sig;
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|
struct sigaction sa;
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sigset_t mask_everything;
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va_list ap;
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va_start(ap, handler);
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sa.sa_handler = handler;
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sigfillset(&mask_everything);
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while ((sig = va_arg(ap, int)) != 0) {
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sa.sa_mask = mask_everything;
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/* XXX SA_RESTART? */
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sa.sa_flags = sig == SIGCHLD ? SA_NOCLDSTOP : 0;
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sigaction(sig, &sa, (struct sigaction *) 0);
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}
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va_end(ap);
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}
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/*
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|
* Delete a set of signals from a mask.
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|
*/
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static void
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|
delset(sigset_t *maskp, ...)
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|
{
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|
int sig;
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|
va_list ap;
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|
va_start(ap, maskp);
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|
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|
while ((sig = va_arg(ap, int)) != 0)
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sigdelset(maskp, sig);
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va_end(ap);
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}
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/*
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* Log a message and sleep for a while (to give someone an opportunity
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* to read it and to save log or hardcopy output if the problem is chronic).
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* NB: should send a message to the session logger to avoid blocking.
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*/
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static void
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|
stall(const char *message, ...)
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|
{
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|
va_list ap;
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va_start(ap, message);
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vsyslog(LOG_ALERT, message, ap);
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va_end(ap);
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sleep(STALL_TIMEOUT);
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}
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/*
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|
* Like stall(), but doesn't sleep.
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|
* If cpp had variadic macros, the two functions could be #defines for another.
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|
* NB: should send a message to the session logger to avoid blocking.
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*/
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|
static void
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|
warning(const char *message, ...)
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|
{
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|
va_list ap;
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|
va_start(ap, message);
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|
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|
vsyslog(LOG_ALERT, message, ap);
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|
va_end(ap);
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|
}
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|
|
/*
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|
* Log an emergency message.
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|
* NB: should send a message to the session logger to avoid blocking.
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|
*/
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|
static void
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|
emergency(const char *message, ...)
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|
{
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|
va_list ap;
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|
va_start(ap, message);
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|
vsyslog(LOG_EMERG, message, ap);
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|
va_end(ap);
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|
}
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|
|
/*
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|
* Catch a SIGSYS signal.
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|
*
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|
* These may arise if a system does not support sysctl.
|
|
* We tolerate up to 25 of these, then throw in the towel.
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|
*/
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|
static void
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|
badsys(int sig)
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|
{
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|
static int badcount = 0;
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|
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|
if (badcount++ < 25)
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return;
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|
disaster(sig);
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|
}
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|
|
/*
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|
* Catch an unexpected signal.
|
|
*/
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|
static void
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|
disaster(int sig)
|
|
{
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|
|
|
emergency("fatal signal: %s",
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(unsigned)sig < NSIG ? sys_siglist[sig] : "unknown signal");
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|
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|
sleep(STALL_TIMEOUT);
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|
_exit(sig); /* reboot */
|
|
}
|
|
|
|
/*
|
|
* Get the security level of the kernel.
|
|
*/
|
|
static int
|
|
getsecuritylevel(void)
|
|
{
|
|
#ifdef KERN_SECURELVL
|
|
int name[2], curlevel;
|
|
size_t len;
|
|
|
|
name[0] = CTL_KERN;
|
|
name[1] = KERN_SECURELVL;
|
|
len = sizeof curlevel;
|
|
if (sysctl(name, 2, &curlevel, &len, NULL, 0) == -1) {
|
|
emergency("cannot get kernel security level: %s",
|
|
strerror(errno));
|
|
return (-1);
|
|
}
|
|
return (curlevel);
|
|
#else
|
|
return (-1);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Set the security level of the kernel.
|
|
*/
|
|
static void
|
|
setsecuritylevel(int newlevel)
|
|
{
|
|
#ifdef KERN_SECURELVL
|
|
int name[2], curlevel;
|
|
|
|
curlevel = getsecuritylevel();
|
|
if (newlevel == curlevel)
|
|
return;
|
|
name[0] = CTL_KERN;
|
|
name[1] = KERN_SECURELVL;
|
|
if (sysctl(name, 2, NULL, NULL, &newlevel, sizeof newlevel) == -1) {
|
|
emergency(
|
|
"cannot change kernel security level from %d to %d: %s",
|
|
curlevel, newlevel, strerror(errno));
|
|
return;
|
|
}
|
|
#ifdef SECURE
|
|
warning("kernel security level changed from %d to %d",
|
|
curlevel, newlevel);
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Change states in the finite state machine.
|
|
* The initial state is passed as an argument.
|
|
*/
|
|
static void
|
|
transition(state_t s)
|
|
{
|
|
|
|
current_state = s;
|
|
for (;;)
|
|
current_state = (state_t) (*current_state)();
|
|
}
|
|
|
|
/*
|
|
* Start a session and allocate a controlling terminal.
|
|
* Only called by children of init after forking.
|
|
*/
|
|
static void
|
|
open_console(void)
|
|
{
|
|
int fd;
|
|
|
|
/*
|
|
* Try to open /dev/console. Open the device with O_NONBLOCK to
|
|
* prevent potential blocking on a carrier.
|
|
*/
|
|
revoke(_PATH_CONSOLE);
|
|
if ((fd = open(_PATH_CONSOLE, O_RDWR | O_NONBLOCK)) != -1) {
|
|
(void)fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_NONBLOCK);
|
|
if (login_tty(fd) == 0)
|
|
return;
|
|
close(fd);
|
|
}
|
|
|
|
/* No luck. Log output to file if possible. */
|
|
if ((fd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
|
|
stall("cannot open null device.");
|
|
_exit(1);
|
|
}
|
|
if (fd != STDIN_FILENO) {
|
|
dup2(fd, STDIN_FILENO);
|
|
close(fd);
|
|
}
|
|
fd = open(_PATH_INITLOG, O_WRONLY | O_APPEND | O_CREAT, 0644);
|
|
if (fd == -1)
|
|
dup2(STDIN_FILENO, STDOUT_FILENO);
|
|
else if (fd != STDOUT_FILENO) {
|
|
dup2(fd, STDOUT_FILENO);
|
|
close(fd);
|
|
}
|
|
dup2(STDOUT_FILENO, STDERR_FILENO);
|
|
}
|
|
|
|
static const char *
|
|
get_shell(void)
|
|
{
|
|
static char kenv_value[PATH_MAX];
|
|
|
|
if (kenv(KENV_GET, "init_shell", kenv_value, sizeof(kenv_value)) > 0)
|
|
return kenv_value;
|
|
else
|
|
return _PATH_BSHELL;
|
|
}
|
|
|
|
static void
|
|
write_stderr(const char *message)
|
|
{
|
|
|
|
write(STDERR_FILENO, message, strlen(message));
|
|
}
|
|
|
|
static int
|
|
read_file(const char *path, void **bufp, size_t *bufsizep)
|
|
{
|
|
struct stat sb;
|
|
size_t bufsize;
|
|
void *buf;
|
|
ssize_t nbytes;
|
|
int error, fd;
|
|
|
|
fd = open(path, O_RDONLY);
|
|
if (fd < 0) {
|
|
emergency("%s: %s", path, strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
error = fstat(fd, &sb);
|
|
if (error != 0) {
|
|
emergency("fstat: %s", strerror(errno));
|
|
close(fd);
|
|
return (error);
|
|
}
|
|
|
|
bufsize = sb.st_size;
|
|
buf = malloc(bufsize);
|
|
if (buf == NULL) {
|
|
emergency("malloc: %s", strerror(errno));
|
|
close(fd);
|
|
return (error);
|
|
}
|
|
|
|
nbytes = read(fd, buf, bufsize);
|
|
if (nbytes != (ssize_t)bufsize) {
|
|
emergency("read: %s", strerror(errno));
|
|
close(fd);
|
|
free(buf);
|
|
return (error);
|
|
}
|
|
|
|
error = close(fd);
|
|
if (error != 0) {
|
|
emergency("close: %s", strerror(errno));
|
|
free(buf);
|
|
return (error);
|
|
}
|
|
|
|
*bufp = buf;
|
|
*bufsizep = bufsize;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
create_file(const char *path, const void *buf, size_t bufsize)
|
|
{
|
|
ssize_t nbytes;
|
|
int error, fd;
|
|
|
|
fd = open(path, O_WRONLY | O_CREAT | O_EXCL, 0700);
|
|
if (fd < 0) {
|
|
emergency("%s: %s", path, strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
nbytes = write(fd, buf, bufsize);
|
|
if (nbytes != (ssize_t)bufsize) {
|
|
emergency("write: %s", strerror(errno));
|
|
close(fd);
|
|
return (-1);
|
|
}
|
|
|
|
error = close(fd);
|
|
if (error != 0) {
|
|
emergency("close: %s", strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mount_tmpfs(const char *fspath)
|
|
{
|
|
struct iovec *iov;
|
|
char errmsg[255];
|
|
int error, iovlen;
|
|
|
|
iov = NULL;
|
|
iovlen = 0;
|
|
memset(errmsg, 0, sizeof(errmsg));
|
|
build_iovec(&iov, &iovlen, "fstype",
|
|
__DECONST(void *, "tmpfs"), (size_t)-1);
|
|
build_iovec(&iov, &iovlen, "fspath",
|
|
__DECONST(void *, fspath), (size_t)-1);
|
|
build_iovec(&iov, &iovlen, "errmsg",
|
|
errmsg, sizeof(errmsg));
|
|
|
|
error = nmount(iov, iovlen, 0);
|
|
if (error != 0) {
|
|
if (*errmsg != '\0') {
|
|
emergency("cannot mount tmpfs on %s: %s: %s",
|
|
fspath, errmsg, strerror(errno));
|
|
} else {
|
|
emergency("cannot mount tmpfs on %s: %s",
|
|
fspath, strerror(errno));
|
|
}
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static state_func_t
|
|
reroot(void)
|
|
{
|
|
void *buf;
|
|
size_t bufsize;
|
|
int error;
|
|
|
|
buf = NULL;
|
|
bufsize = 0;
|
|
|
|
revoke_ttys();
|
|
runshutdown();
|
|
|
|
/*
|
|
* Make sure nobody can interfere with our scheme.
|
|
* Ignore ESRCH, which can apparently happen when
|
|
* there are no processes to kill.
|
|
*/
|
|
error = kill(-1, SIGKILL);
|
|
if (error != 0 && errno != ESRCH) {
|
|
emergency("kill(2) failed: %s", strerror(errno));
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Copy the init binary into tmpfs, so that we can unmount
|
|
* the old rootfs without committing suicide.
|
|
*/
|
|
error = read_file(init_path_argv0, &buf, &bufsize);
|
|
if (error != 0)
|
|
goto out;
|
|
error = mount_tmpfs(_PATH_REROOT);
|
|
if (error != 0)
|
|
goto out;
|
|
error = create_file(_PATH_REROOT_INIT, buf, bufsize);
|
|
if (error != 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Execute the temporary init.
|
|
*/
|
|
execl(_PATH_REROOT_INIT, _PATH_REROOT_INIT, "-r", NULL);
|
|
emergency("cannot exec %s: %s", _PATH_REROOT_INIT, strerror(errno));
|
|
|
|
out:
|
|
emergency("reroot failed; going to single user mode");
|
|
free(buf);
|
|
return (state_func_t) single_user;
|
|
}
|
|
|
|
static state_func_t
|
|
reroot_phase_two(void)
|
|
{
|
|
char init_path[PATH_MAX], *path, *path_component;
|
|
size_t init_path_len;
|
|
int nbytes, error;
|
|
|
|
/*
|
|
* Ask the kernel to mount the new rootfs.
|
|
*/
|
|
error = reboot(RB_REROOT);
|
|
if (error != 0) {
|
|
emergency("RB_REBOOT failed: %s", strerror(errno));
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Figure out where the destination init(8) binary is. Note that
|
|
* the path could be different than what we've started with. Use
|
|
* the value from kenv, if set, or the one from sysctl otherwise.
|
|
* The latter defaults to a hardcoded value, but can be overridden
|
|
* by a build time option.
|
|
*/
|
|
nbytes = kenv(KENV_GET, "init_path", init_path, sizeof(init_path));
|
|
if (nbytes <= 0) {
|
|
init_path_len = sizeof(init_path);
|
|
error = sysctlbyname("kern.init_path",
|
|
init_path, &init_path_len, NULL, 0);
|
|
if (error != 0) {
|
|
emergency("failed to retrieve kern.init_path: %s",
|
|
strerror(errno));
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Repeat the init search logic from sys/kern/init_path.c
|
|
*/
|
|
path_component = init_path;
|
|
while ((path = strsep(&path_component, ":")) != NULL) {
|
|
/*
|
|
* Execute init(8) from the new rootfs.
|
|
*/
|
|
execl(path, path, NULL);
|
|
}
|
|
emergency("cannot exec init from %s: %s", init_path, strerror(errno));
|
|
|
|
out:
|
|
emergency("reroot failed; going to single user mode");
|
|
return (state_func_t) single_user;
|
|
}
|
|
|
|
/*
|
|
* Bring the system up single user.
|
|
*/
|
|
static state_func_t
|
|
single_user(void)
|
|
{
|
|
pid_t pid, wpid;
|
|
int status;
|
|
sigset_t mask;
|
|
const char *shell;
|
|
char *argv[2];
|
|
#ifdef SECURE
|
|
struct ttyent *typ;
|
|
struct passwd *pp;
|
|
static const char banner[] =
|
|
"Enter root password, or ^D to go multi-user\n";
|
|
char *clear, *password;
|
|
#endif
|
|
#ifdef DEBUGSHELL
|
|
char altshell[128];
|
|
#endif
|
|
|
|
if (Reboot) {
|
|
/* Instead of going single user, let's reboot the machine */
|
|
sync();
|
|
reboot(howto);
|
|
_exit(0);
|
|
}
|
|
|
|
shell = get_shell();
|
|
|
|
if ((pid = fork()) == 0) {
|
|
/*
|
|
* Start the single user session.
|
|
*/
|
|
open_console();
|
|
|
|
#ifdef SECURE
|
|
/*
|
|
* Check the root password.
|
|
* We don't care if the console is 'on' by default;
|
|
* it's the only tty that can be 'off' and 'secure'.
|
|
*/
|
|
typ = getttynam("console");
|
|
pp = getpwnam("root");
|
|
if (typ && (typ->ty_status & TTY_SECURE) == 0 &&
|
|
pp && *pp->pw_passwd) {
|
|
write_stderr(banner);
|
|
for (;;) {
|
|
clear = getpass("Password:");
|
|
if (clear == 0 || *clear == '\0')
|
|
_exit(0);
|
|
password = crypt(clear, pp->pw_passwd);
|
|
bzero(clear, _PASSWORD_LEN);
|
|
if (password == NULL ||
|
|
strcmp(password, pp->pw_passwd) == 0)
|
|
break;
|
|
warning("single-user login failed\n");
|
|
}
|
|
}
|
|
endttyent();
|
|
endpwent();
|
|
#endif /* SECURE */
|
|
|
|
#ifdef DEBUGSHELL
|
|
{
|
|
char *cp = altshell;
|
|
int num;
|
|
|
|
#define SHREQUEST "Enter full pathname of shell or RETURN for "
|
|
write_stderr(SHREQUEST);
|
|
write_stderr(shell);
|
|
write_stderr(": ");
|
|
while ((num = read(STDIN_FILENO, cp, 1)) != -1 &&
|
|
num != 0 && *cp != '\n' && cp < &altshell[127])
|
|
cp++;
|
|
*cp = '\0';
|
|
if (altshell[0] != '\0')
|
|
shell = altshell;
|
|
}
|
|
#endif /* DEBUGSHELL */
|
|
|
|
/*
|
|
* Unblock signals.
|
|
* We catch all the interesting ones,
|
|
* and those are reset to SIG_DFL on exec.
|
|
*/
|
|
sigemptyset(&mask);
|
|
sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
|
|
|
|
/*
|
|
* Fire off a shell.
|
|
* If the default one doesn't work, try the Bourne shell.
|
|
*/
|
|
|
|
char name[] = "-sh";
|
|
|
|
argv[0] = name;
|
|
argv[1] = 0;
|
|
execv(shell, argv);
|
|
emergency("can't exec %s for single user: %m", shell);
|
|
execv(_PATH_BSHELL, argv);
|
|
emergency("can't exec %s for single user: %m", _PATH_BSHELL);
|
|
sleep(STALL_TIMEOUT);
|
|
_exit(1);
|
|
}
|
|
|
|
if (pid == -1) {
|
|
/*
|
|
* We are seriously hosed. Do our best.
|
|
*/
|
|
emergency("can't fork single-user shell, trying again");
|
|
while (waitpid(-1, (int *) 0, WNOHANG) > 0)
|
|
continue;
|
|
return (state_func_t) single_user;
|
|
}
|
|
|
|
requested_transition = 0;
|
|
do {
|
|
if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1)
|
|
collect_child(wpid);
|
|
if (wpid == -1) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
warning("wait for single-user shell failed: %m; restarting");
|
|
return (state_func_t) single_user;
|
|
}
|
|
if (wpid == pid && WIFSTOPPED(status)) {
|
|
warning("init: shell stopped, restarting\n");
|
|
kill(pid, SIGCONT);
|
|
wpid = -1;
|
|
}
|
|
} while (wpid != pid && !requested_transition);
|
|
|
|
if (requested_transition)
|
|
return (state_func_t) requested_transition;
|
|
|
|
if (!WIFEXITED(status)) {
|
|
if (WTERMSIG(status) == SIGKILL) {
|
|
/*
|
|
* reboot(8) killed shell?
|
|
*/
|
|
warning("single user shell terminated.");
|
|
sleep(STALL_TIMEOUT);
|
|
_exit(0);
|
|
} else {
|
|
warning("single user shell terminated, restarting");
|
|
return (state_func_t) single_user;
|
|
}
|
|
}
|
|
|
|
runcom_mode = FASTBOOT;
|
|
return (state_func_t) runcom;
|
|
}
|
|
|
|
/*
|
|
* Run the system startup script.
|
|
*/
|
|
static state_func_t
|
|
runcom(void)
|
|
{
|
|
state_func_t next_transition;
|
|
|
|
if ((next_transition = run_script(_PATH_RUNCOM)) != 0)
|
|
return next_transition;
|
|
|
|
runcom_mode = AUTOBOOT; /* the default */
|
|
return (state_func_t) read_ttys;
|
|
}
|
|
|
|
/*
|
|
* Run a shell script.
|
|
* Returns 0 on success, otherwise the next transition to enter:
|
|
* - single_user if fork/execv/waitpid failed, or if the script
|
|
* terminated with a signal or exit code != 0.
|
|
* - death_single if a SIGTERM was delivered to init(8).
|
|
*/
|
|
static state_func_t
|
|
run_script(const char *script)
|
|
{
|
|
pid_t pid, wpid;
|
|
int status;
|
|
char *argv[4];
|
|
const char *shell;
|
|
struct sigaction sa;
|
|
|
|
shell = get_shell();
|
|
|
|
if ((pid = fork()) == 0) {
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_flags = 0;
|
|
sa.sa_handler = SIG_IGN;
|
|
sigaction(SIGTSTP, &sa, (struct sigaction *)0);
|
|
sigaction(SIGHUP, &sa, (struct sigaction *)0);
|
|
|
|
open_console();
|
|
|
|
char _sh[] = "sh";
|
|
char _autoboot[] = "autoboot";
|
|
|
|
argv[0] = _sh;
|
|
argv[1] = __DECONST(char *, script);
|
|
argv[2] = runcom_mode == AUTOBOOT ? _autoboot : 0;
|
|
argv[3] = 0;
|
|
|
|
sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0);
|
|
|
|
#ifdef LOGIN_CAP
|
|
setprocresources(RESOURCE_RC);
|
|
#endif
|
|
execv(shell, argv);
|
|
stall("can't exec %s for %s: %m", shell, script);
|
|
_exit(1); /* force single user mode */
|
|
}
|
|
|
|
if (pid == -1) {
|
|
emergency("can't fork for %s on %s: %m", shell, script);
|
|
while (waitpid(-1, (int *) 0, WNOHANG) > 0)
|
|
continue;
|
|
sleep(STALL_TIMEOUT);
|
|
return (state_func_t) single_user;
|
|
}
|
|
|
|
/*
|
|
* Copied from single_user(). This is a bit paranoid.
|
|
*/
|
|
requested_transition = 0;
|
|
do {
|
|
if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1)
|
|
collect_child(wpid);
|
|
if (wpid == -1) {
|
|
if (requested_transition == death_single ||
|
|
requested_transition == reroot)
|
|
return (state_func_t) requested_transition;
|
|
if (errno == EINTR)
|
|
continue;
|
|
warning("wait for %s on %s failed: %m; going to "
|
|
"single user mode", shell, script);
|
|
return (state_func_t) single_user;
|
|
}
|
|
if (wpid == pid && WIFSTOPPED(status)) {
|
|
warning("init: %s on %s stopped, restarting\n",
|
|
shell, script);
|
|
kill(pid, SIGCONT);
|
|
wpid = -1;
|
|
}
|
|
} while (wpid != pid);
|
|
|
|
if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM &&
|
|
requested_transition == catatonia) {
|
|
/* /etc/rc executed /sbin/reboot; wait for the end quietly */
|
|
sigset_t s;
|
|
|
|
sigfillset(&s);
|
|
for (;;)
|
|
sigsuspend(&s);
|
|
}
|
|
|
|
if (!WIFEXITED(status)) {
|
|
warning("%s on %s terminated abnormally, going to single "
|
|
"user mode", shell, script);
|
|
return (state_func_t) single_user;
|
|
}
|
|
|
|
if (WEXITSTATUS(status))
|
|
return (state_func_t) single_user;
|
|
|
|
return (state_func_t) 0;
|
|
}
|
|
|
|
/*
|
|
* Open the session database.
|
|
*
|
|
* NB: We could pass in the size here; is it necessary?
|
|
*/
|
|
static int
|
|
start_session_db(void)
|
|
{
|
|
if (session_db && (*session_db->close)(session_db))
|
|
emergency("session database close: %s", strerror(errno));
|
|
if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == NULL) {
|
|
emergency("session database open: %s", strerror(errno));
|
|
return (1);
|
|
}
|
|
return (0);
|
|
|
|
}
|
|
|
|
/*
|
|
* Add a new login session.
|
|
*/
|
|
static void
|
|
add_session(session_t *sp)
|
|
{
|
|
DBT key;
|
|
DBT data;
|
|
|
|
key.data = &sp->se_process;
|
|
key.size = sizeof sp->se_process;
|
|
data.data = &sp;
|
|
data.size = sizeof sp;
|
|
|
|
if ((*session_db->put)(session_db, &key, &data, 0))
|
|
emergency("insert %d: %s", sp->se_process, strerror(errno));
|
|
}
|
|
|
|
/*
|
|
* Delete an old login session.
|
|
*/
|
|
static void
|
|
del_session(session_t *sp)
|
|
{
|
|
DBT key;
|
|
|
|
key.data = &sp->se_process;
|
|
key.size = sizeof sp->se_process;
|
|
|
|
if ((*session_db->del)(session_db, &key, 0))
|
|
emergency("delete %d: %s", sp->se_process, strerror(errno));
|
|
}
|
|
|
|
/*
|
|
* Look up a login session by pid.
|
|
*/
|
|
static session_t *
|
|
find_session(pid_t pid)
|
|
{
|
|
DBT key;
|
|
DBT data;
|
|
session_t *ret;
|
|
|
|
key.data = &pid;
|
|
key.size = sizeof pid;
|
|
if ((*session_db->get)(session_db, &key, &data, 0) != 0)
|
|
return 0;
|
|
bcopy(data.data, (char *)&ret, sizeof(ret));
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Construct an argument vector from a command line.
|
|
*/
|
|
static char **
|
|
construct_argv(char *command)
|
|
{
|
|
int argc = 0;
|
|
char **argv = (char **) malloc(((strlen(command) + 1) / 2 + 1)
|
|
* sizeof (char *));
|
|
|
|
if ((argv[argc++] = strk(command)) == 0) {
|
|
free(argv);
|
|
return (NULL);
|
|
}
|
|
while ((argv[argc++] = strk((char *) 0)) != NULL)
|
|
continue;
|
|
return argv;
|
|
}
|
|
|
|
/*
|
|
* Deallocate a session descriptor.
|
|
*/
|
|
static void
|
|
free_session(session_t *sp)
|
|
{
|
|
free(sp->se_device);
|
|
if (sp->se_getty) {
|
|
free(sp->se_getty);
|
|
free(sp->se_getty_argv_space);
|
|
free(sp->se_getty_argv);
|
|
}
|
|
if (sp->se_window) {
|
|
free(sp->se_window);
|
|
free(sp->se_window_argv_space);
|
|
free(sp->se_window_argv);
|
|
}
|
|
if (sp->se_type)
|
|
free(sp->se_type);
|
|
free(sp);
|
|
}
|
|
|
|
/*
|
|
* Allocate a new session descriptor.
|
|
* Mark it SE_PRESENT.
|
|
*/
|
|
static session_t *
|
|
new_session(session_t *sprev, struct ttyent *typ)
|
|
{
|
|
session_t *sp;
|
|
int fd;
|
|
|
|
if ((typ->ty_status & TTY_ON) == 0 ||
|
|
typ->ty_name == 0 ||
|
|
typ->ty_getty == 0)
|
|
return 0;
|
|
|
|
sp = (session_t *) calloc(1, sizeof (session_t));
|
|
|
|
sp->se_flags |= SE_PRESENT;
|
|
|
|
sp->se_device = malloc(sizeof(_PATH_DEV) + strlen(typ->ty_name));
|
|
sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name);
|
|
|
|
/*
|
|
* Attempt to open the device, if we get "device not configured"
|
|
* then don't add the device to the session list.
|
|
*/
|
|
if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) {
|
|
if (errno == ENXIO) {
|
|
free_session(sp);
|
|
return (0);
|
|
}
|
|
} else
|
|
close(fd);
|
|
|
|
if (setupargv(sp, typ) == 0) {
|
|
free_session(sp);
|
|
return (0);
|
|
}
|
|
|
|
sp->se_next = 0;
|
|
if (sprev == NULL) {
|
|
sessions = sp;
|
|
sp->se_prev = 0;
|
|
} else {
|
|
sprev->se_next = sp;
|
|
sp->se_prev = sprev;
|
|
}
|
|
|
|
return sp;
|
|
}
|
|
|
|
/*
|
|
* Calculate getty and if useful window argv vectors.
|
|
*/
|
|
static int
|
|
setupargv(session_t *sp, struct ttyent *typ)
|
|
{
|
|
|
|
if (sp->se_getty) {
|
|
free(sp->se_getty);
|
|
free(sp->se_getty_argv_space);
|
|
free(sp->se_getty_argv);
|
|
}
|
|
sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2);
|
|
sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name);
|
|
sp->se_getty_argv_space = strdup(sp->se_getty);
|
|
sp->se_getty_argv = construct_argv(sp->se_getty_argv_space);
|
|
if (sp->se_getty_argv == NULL) {
|
|
warning("can't parse getty for port %s", sp->se_device);
|
|
free(sp->se_getty);
|
|
free(sp->se_getty_argv_space);
|
|
sp->se_getty = sp->se_getty_argv_space = 0;
|
|
return (0);
|
|
}
|
|
if (sp->se_window) {
|
|
free(sp->se_window);
|
|
free(sp->se_window_argv_space);
|
|
free(sp->se_window_argv);
|
|
}
|
|
sp->se_window = sp->se_window_argv_space = 0;
|
|
sp->se_window_argv = 0;
|
|
if (typ->ty_window) {
|
|
sp->se_window = strdup(typ->ty_window);
|
|
sp->se_window_argv_space = strdup(sp->se_window);
|
|
sp->se_window_argv = construct_argv(sp->se_window_argv_space);
|
|
if (sp->se_window_argv == NULL) {
|
|
warning("can't parse window for port %s",
|
|
sp->se_device);
|
|
free(sp->se_window_argv_space);
|
|
free(sp->se_window);
|
|
sp->se_window = sp->se_window_argv_space = 0;
|
|
return (0);
|
|
}
|
|
}
|
|
if (sp->se_type)
|
|
free(sp->se_type);
|
|
sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0;
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Walk the list of ttys and create sessions for each active line.
|
|
*/
|
|
static state_func_t
|
|
read_ttys(void)
|
|
{
|
|
session_t *sp, *snext;
|
|
struct ttyent *typ;
|
|
|
|
/*
|
|
* Destroy any previous session state.
|
|
* There shouldn't be any, but just in case...
|
|
*/
|
|
for (sp = sessions; sp; sp = snext) {
|
|
snext = sp->se_next;
|
|
free_session(sp);
|
|
}
|
|
sessions = 0;
|
|
if (start_session_db())
|
|
return (state_func_t) single_user;
|
|
|
|
/*
|
|
* Allocate a session entry for each active port.
|
|
* Note that sp starts at 0.
|
|
*/
|
|
while ((typ = getttyent()) != NULL)
|
|
if ((snext = new_session(sp, typ)) != NULL)
|
|
sp = snext;
|
|
|
|
endttyent();
|
|
|
|
return (state_func_t) multi_user;
|
|
}
|
|
|
|
/*
|
|
* Start a window system running.
|
|
*/
|
|
static void
|
|
start_window_system(session_t *sp)
|
|
{
|
|
pid_t pid;
|
|
sigset_t mask;
|
|
char term[64], *env[2];
|
|
int status;
|
|
|
|
if ((pid = fork()) == -1) {
|
|
emergency("can't fork for window system on port %s: %m",
|
|
sp->se_device);
|
|
/* hope that getty fails and we can try again */
|
|
return;
|
|
}
|
|
if (pid) {
|
|
waitpid(-1, &status, 0);
|
|
return;
|
|
}
|
|
|
|
/* reparent window process to the init to not make a zombie on exit */
|
|
if ((pid = fork()) == -1) {
|
|
emergency("can't fork for window system on port %s: %m",
|
|
sp->se_device);
|
|
_exit(1);
|
|
}
|
|
if (pid)
|
|
_exit(0);
|
|
|
|
sigemptyset(&mask);
|
|
sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
|
|
|
|
if (setsid() < 0)
|
|
emergency("setsid failed (window) %m");
|
|
|
|
#ifdef LOGIN_CAP
|
|
setprocresources(RESOURCE_WINDOW);
|
|
#endif
|
|
if (sp->se_type) {
|
|
/* Don't use malloc after fork */
|
|
strcpy(term, "TERM=");
|
|
strncat(term, sp->se_type, sizeof(term) - 6);
|
|
env[0] = term;
|
|
env[1] = 0;
|
|
}
|
|
else
|
|
env[0] = 0;
|
|
execve(sp->se_window_argv[0], sp->se_window_argv, env);
|
|
stall("can't exec window system '%s' for port %s: %m",
|
|
sp->se_window_argv[0], sp->se_device);
|
|
_exit(1);
|
|
}
|
|
|
|
/*
|
|
* Start a login session running.
|
|
*/
|
|
static pid_t
|
|
start_getty(session_t *sp)
|
|
{
|
|
pid_t pid;
|
|
sigset_t mask;
|
|
time_t current_time = time((time_t *) 0);
|
|
int too_quick = 0;
|
|
char term[64], *env[2];
|
|
|
|
if (current_time >= sp->se_started &&
|
|
current_time - sp->se_started < GETTY_SPACING) {
|
|
if (++sp->se_nspace > GETTY_NSPACE) {
|
|
sp->se_nspace = 0;
|
|
too_quick = 1;
|
|
}
|
|
} else
|
|
sp->se_nspace = 0;
|
|
|
|
/*
|
|
* fork(), not vfork() -- we can't afford to block.
|
|
*/
|
|
if ((pid = fork()) == -1) {
|
|
emergency("can't fork for getty on port %s: %m", sp->se_device);
|
|
return -1;
|
|
}
|
|
|
|
if (pid)
|
|
return pid;
|
|
|
|
if (too_quick) {
|
|
warning("getty repeating too quickly on port %s, sleeping %d secs",
|
|
sp->se_device, GETTY_SLEEP);
|
|
sleep((unsigned) GETTY_SLEEP);
|
|
}
|
|
|
|
if (sp->se_window) {
|
|
start_window_system(sp);
|
|
sleep(WINDOW_WAIT);
|
|
}
|
|
|
|
sigemptyset(&mask);
|
|
sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
|
|
|
|
#ifdef LOGIN_CAP
|
|
setprocresources(RESOURCE_GETTY);
|
|
#endif
|
|
if (sp->se_type) {
|
|
/* Don't use malloc after fork */
|
|
strcpy(term, "TERM=");
|
|
strncat(term, sp->se_type, sizeof(term) - 6);
|
|
env[0] = term;
|
|
env[1] = 0;
|
|
} else
|
|
env[0] = 0;
|
|
execve(sp->se_getty_argv[0], sp->se_getty_argv, env);
|
|
stall("can't exec getty '%s' for port %s: %m",
|
|
sp->se_getty_argv[0], sp->se_device);
|
|
_exit(1);
|
|
}
|
|
|
|
/*
|
|
* Collect exit status for a child.
|
|
* If an exiting login, start a new login running.
|
|
*/
|
|
static void
|
|
collect_child(pid_t pid)
|
|
{
|
|
session_t *sp, *sprev, *snext;
|
|
|
|
if (! sessions)
|
|
return;
|
|
|
|
if (! (sp = find_session(pid)))
|
|
return;
|
|
|
|
del_session(sp);
|
|
sp->se_process = 0;
|
|
|
|
if (sp->se_flags & SE_SHUTDOWN) {
|
|
if ((sprev = sp->se_prev) != NULL)
|
|
sprev->se_next = sp->se_next;
|
|
else
|
|
sessions = sp->se_next;
|
|
if ((snext = sp->se_next) != NULL)
|
|
snext->se_prev = sp->se_prev;
|
|
free_session(sp);
|
|
return;
|
|
}
|
|
|
|
if ((pid = start_getty(sp)) == -1) {
|
|
/* serious trouble */
|
|
requested_transition = clean_ttys;
|
|
return;
|
|
}
|
|
|
|
sp->se_process = pid;
|
|
sp->se_started = time((time_t *) 0);
|
|
add_session(sp);
|
|
}
|
|
|
|
/*
|
|
* Catch a signal and request a state transition.
|
|
*/
|
|
static void
|
|
transition_handler(int sig)
|
|
{
|
|
|
|
switch (sig) {
|
|
case SIGHUP:
|
|
if (current_state == read_ttys || current_state == multi_user ||
|
|
current_state == clean_ttys || current_state == catatonia)
|
|
requested_transition = clean_ttys;
|
|
break;
|
|
case SIGUSR2:
|
|
howto = RB_POWEROFF;
|
|
case SIGUSR1:
|
|
howto |= RB_HALT;
|
|
case SIGINT:
|
|
Reboot = TRUE;
|
|
case SIGTERM:
|
|
if (current_state == read_ttys || current_state == multi_user ||
|
|
current_state == clean_ttys || current_state == catatonia)
|
|
requested_transition = death;
|
|
else
|
|
requested_transition = death_single;
|
|
break;
|
|
case SIGTSTP:
|
|
if (current_state == runcom || current_state == read_ttys ||
|
|
current_state == clean_ttys ||
|
|
current_state == multi_user || current_state == catatonia)
|
|
requested_transition = catatonia;
|
|
break;
|
|
case SIGEMT:
|
|
requested_transition = reroot;
|
|
break;
|
|
default:
|
|
requested_transition = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Take the system multiuser.
|
|
*/
|
|
static state_func_t
|
|
multi_user(void)
|
|
{
|
|
pid_t pid;
|
|
session_t *sp;
|
|
|
|
requested_transition = 0;
|
|
|
|
/*
|
|
* If the administrator has not set the security level to -1
|
|
* to indicate that the kernel should not run multiuser in secure
|
|
* mode, and the run script has not set a higher level of security
|
|
* than level 1, then put the kernel into secure mode.
|
|
*/
|
|
if (getsecuritylevel() == 0)
|
|
setsecuritylevel(1);
|
|
|
|
for (sp = sessions; sp; sp = sp->se_next) {
|
|
if (sp->se_process)
|
|
continue;
|
|
if ((pid = start_getty(sp)) == -1) {
|
|
/* serious trouble */
|
|
requested_transition = clean_ttys;
|
|
break;
|
|
}
|
|
sp->se_process = pid;
|
|
sp->se_started = time((time_t *) 0);
|
|
add_session(sp);
|
|
}
|
|
|
|
while (!requested_transition)
|
|
if ((pid = waitpid(-1, (int *) 0, 0)) != -1)
|
|
collect_child(pid);
|
|
|
|
return (state_func_t) requested_transition;
|
|
}
|
|
|
|
/*
|
|
* This is an (n*2)+(n^2) algorithm. We hope it isn't run often...
|
|
*/
|
|
static state_func_t
|
|
clean_ttys(void)
|
|
{
|
|
session_t *sp, *sprev;
|
|
struct ttyent *typ;
|
|
int devlen;
|
|
char *old_getty, *old_window, *old_type;
|
|
|
|
/*
|
|
* mark all sessions for death, (!SE_PRESENT)
|
|
* as we find or create new ones they'll be marked as keepers,
|
|
* we'll later nuke all the ones not found in /etc/ttys
|
|
*/
|
|
for (sp = sessions; sp != NULL; sp = sp->se_next)
|
|
sp->se_flags &= ~SE_PRESENT;
|
|
|
|
devlen = sizeof(_PATH_DEV) - 1;
|
|
while ((typ = getttyent()) != NULL) {
|
|
for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next)
|
|
if (strcmp(typ->ty_name, sp->se_device + devlen) == 0)
|
|
break;
|
|
|
|
if (sp) {
|
|
/* we want this one to live */
|
|
sp->se_flags |= SE_PRESENT;
|
|
if ((typ->ty_status & TTY_ON) == 0 ||
|
|
typ->ty_getty == 0) {
|
|
sp->se_flags |= SE_SHUTDOWN;
|
|
kill(sp->se_process, SIGHUP);
|
|
continue;
|
|
}
|
|
sp->se_flags &= ~SE_SHUTDOWN;
|
|
old_getty = sp->se_getty ? strdup(sp->se_getty) : 0;
|
|
old_window = sp->se_window ? strdup(sp->se_window) : 0;
|
|
old_type = sp->se_type ? strdup(sp->se_type) : 0;
|
|
if (setupargv(sp, typ) == 0) {
|
|
warning("can't parse getty for port %s",
|
|
sp->se_device);
|
|
sp->se_flags |= SE_SHUTDOWN;
|
|
kill(sp->se_process, SIGHUP);
|
|
}
|
|
else if ( !old_getty
|
|
|| (!old_type && sp->se_type)
|
|
|| (old_type && !sp->se_type)
|
|
|| (!old_window && sp->se_window)
|
|
|| (old_window && !sp->se_window)
|
|
|| (strcmp(old_getty, sp->se_getty) != 0)
|
|
|| (old_window && strcmp(old_window, sp->se_window) != 0)
|
|
|| (old_type && strcmp(old_type, sp->se_type) != 0)
|
|
) {
|
|
/* Don't set SE_SHUTDOWN here */
|
|
sp->se_nspace = 0;
|
|
sp->se_started = 0;
|
|
kill(sp->se_process, SIGHUP);
|
|
}
|
|
if (old_getty)
|
|
free(old_getty);
|
|
if (old_window)
|
|
free(old_window);
|
|
if (old_type)
|
|
free(old_type);
|
|
continue;
|
|
}
|
|
|
|
new_session(sprev, typ);
|
|
}
|
|
|
|
endttyent();
|
|
|
|
/*
|
|
* sweep through and kill all deleted sessions
|
|
* ones who's /etc/ttys line was deleted (SE_PRESENT unset)
|
|
*/
|
|
for (sp = sessions; sp != NULL; sp = sp->se_next) {
|
|
if ((sp->se_flags & SE_PRESENT) == 0) {
|
|
sp->se_flags |= SE_SHUTDOWN;
|
|
kill(sp->se_process, SIGHUP);
|
|
}
|
|
}
|
|
|
|
return (state_func_t) multi_user;
|
|
}
|
|
|
|
/*
|
|
* Block further logins.
|
|
*/
|
|
static state_func_t
|
|
catatonia(void)
|
|
{
|
|
session_t *sp;
|
|
|
|
for (sp = sessions; sp; sp = sp->se_next)
|
|
sp->se_flags |= SE_SHUTDOWN;
|
|
|
|
return (state_func_t) multi_user;
|
|
}
|
|
|
|
/*
|
|
* Note SIGALRM.
|
|
*/
|
|
static void
|
|
alrm_handler(int sig)
|
|
{
|
|
|
|
(void)sig;
|
|
clang = 1;
|
|
}
|
|
|
|
/*
|
|
* Bring the system down to single user.
|
|
*/
|
|
static state_func_t
|
|
death(void)
|
|
{
|
|
int block, blocked;
|
|
size_t len;
|
|
|
|
/* Temporarily block suspend. */
|
|
len = sizeof(blocked);
|
|
block = 1;
|
|
if (sysctlbyname("kern.suspend_blocked", &blocked, &len,
|
|
&block, sizeof(block)) == -1)
|
|
blocked = 0;
|
|
|
|
/*
|
|
* Also revoke the TTY here. Because runshutdown() may reopen
|
|
* the TTY whose getty we're killing here, there is no guarantee
|
|
* runshutdown() will perform the initial open() call, causing
|
|
* the terminal attributes to be misconfigured.
|
|
*/
|
|
revoke_ttys();
|
|
|
|
/* Try to run the rc.shutdown script within a period of time */
|
|
runshutdown();
|
|
|
|
/* Unblock suspend if we blocked it. */
|
|
if (!blocked)
|
|
sysctlbyname("kern.suspend_blocked", NULL, NULL,
|
|
&blocked, sizeof(blocked));
|
|
|
|
return (state_func_t) death_single;
|
|
}
|
|
|
|
/*
|
|
* Do what is necessary to reinitialize single user mode or reboot
|
|
* from an incomplete state.
|
|
*/
|
|
static state_func_t
|
|
death_single(void)
|
|
{
|
|
int i;
|
|
pid_t pid;
|
|
static const int death_sigs[2] = { SIGTERM, SIGKILL };
|
|
|
|
revoke(_PATH_CONSOLE);
|
|
|
|
for (i = 0; i < 2; ++i) {
|
|
if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH)
|
|
return (state_func_t) single_user;
|
|
|
|
clang = 0;
|
|
alarm(DEATH_WATCH);
|
|
do
|
|
if ((pid = waitpid(-1, (int *)0, 0)) != -1)
|
|
collect_child(pid);
|
|
while (clang == 0 && errno != ECHILD);
|
|
|
|
if (errno == ECHILD)
|
|
return (state_func_t) single_user;
|
|
}
|
|
|
|
warning("some processes would not die; ps axl advised");
|
|
|
|
return (state_func_t) single_user;
|
|
}
|
|
|
|
static void
|
|
revoke_ttys(void)
|
|
{
|
|
session_t *sp;
|
|
|
|
for (sp = sessions; sp; sp = sp->se_next) {
|
|
sp->se_flags |= SE_SHUTDOWN;
|
|
kill(sp->se_process, SIGHUP);
|
|
revoke(sp->se_device);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Run the system shutdown script.
|
|
*
|
|
* Exit codes: XXX I should document more
|
|
* -2 shutdown script terminated abnormally
|
|
* -1 fatal error - can't run script
|
|
* 0 good.
|
|
* >0 some error (exit code)
|
|
*/
|
|
static int
|
|
runshutdown(void)
|
|
{
|
|
pid_t pid, wpid;
|
|
int status;
|
|
int shutdowntimeout;
|
|
size_t len;
|
|
char *argv[4];
|
|
const char *shell;
|
|
struct sigaction sa;
|
|
struct stat sb;
|
|
|
|
/*
|
|
* rc.shutdown is optional, so to prevent any unnecessary
|
|
* complaints from the shell we simply don't run it if the
|
|
* file does not exist. If the stat() here fails for other
|
|
* reasons, we'll let the shell complain.
|
|
*/
|
|
if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT)
|
|
return 0;
|
|
|
|
shell = get_shell();
|
|
|
|
if ((pid = fork()) == 0) {
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_flags = 0;
|
|
sa.sa_handler = SIG_IGN;
|
|
sigaction(SIGTSTP, &sa, (struct sigaction *)0);
|
|
sigaction(SIGHUP, &sa, (struct sigaction *)0);
|
|
|
|
open_console();
|
|
|
|
char _sh[] = "sh";
|
|
char _reboot[] = "reboot";
|
|
char _single[] = "single";
|
|
char _path_rundown[] = _PATH_RUNDOWN;
|
|
|
|
argv[0] = _sh;
|
|
argv[1] = _path_rundown;
|
|
argv[2] = Reboot ? _reboot : _single;
|
|
argv[3] = 0;
|
|
|
|
sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0);
|
|
|
|
#ifdef LOGIN_CAP
|
|
setprocresources(RESOURCE_RC);
|
|
#endif
|
|
execv(shell, argv);
|
|
warning("can't exec %s for %s: %m", shell, _PATH_RUNDOWN);
|
|
_exit(1); /* force single user mode */
|
|
}
|
|
|
|
if (pid == -1) {
|
|
emergency("can't fork for %s on %s: %m", shell, _PATH_RUNDOWN);
|
|
while (waitpid(-1, (int *) 0, WNOHANG) > 0)
|
|
continue;
|
|
sleep(STALL_TIMEOUT);
|
|
return -1;
|
|
}
|
|
|
|
len = sizeof(shutdowntimeout);
|
|
if (sysctlbyname("kern.init_shutdown_timeout", &shutdowntimeout, &len,
|
|
NULL, 0) == -1 || shutdowntimeout < 2)
|
|
shutdowntimeout = DEATH_SCRIPT;
|
|
alarm(shutdowntimeout);
|
|
clang = 0;
|
|
/*
|
|
* Copied from single_user(). This is a bit paranoid.
|
|
* Use the same ALRM handler.
|
|
*/
|
|
do {
|
|
if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1)
|
|
collect_child(wpid);
|
|
if (clang == 1) {
|
|
/* we were waiting for the sub-shell */
|
|
kill(wpid, SIGTERM);
|
|
warning("timeout expired for %s on %s: %m; going to "
|
|
"single user mode", shell, _PATH_RUNDOWN);
|
|
return -1;
|
|
}
|
|
if (wpid == -1) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
warning("wait for %s on %s failed: %m; going to "
|
|
"single user mode", shell, _PATH_RUNDOWN);
|
|
return -1;
|
|
}
|
|
if (wpid == pid && WIFSTOPPED(status)) {
|
|
warning("init: %s on %s stopped, restarting\n",
|
|
shell, _PATH_RUNDOWN);
|
|
kill(pid, SIGCONT);
|
|
wpid = -1;
|
|
}
|
|
} while (wpid != pid && !clang);
|
|
|
|
/* Turn off the alarm */
|
|
alarm(0);
|
|
|
|
if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM &&
|
|
requested_transition == catatonia) {
|
|
/*
|
|
* /etc/rc.shutdown executed /sbin/reboot;
|
|
* wait for the end quietly
|
|
*/
|
|
sigset_t s;
|
|
|
|
sigfillset(&s);
|
|
for (;;)
|
|
sigsuspend(&s);
|
|
}
|
|
|
|
if (!WIFEXITED(status)) {
|
|
warning("%s on %s terminated abnormally, going to "
|
|
"single user mode", shell, _PATH_RUNDOWN);
|
|
return -2;
|
|
}
|
|
|
|
if ((status = WEXITSTATUS(status)) != 0)
|
|
warning("%s returned status %d", _PATH_RUNDOWN, status);
|
|
|
|
return status;
|
|
}
|
|
|
|
static char *
|
|
strk(char *p)
|
|
{
|
|
static char *t;
|
|
char *q;
|
|
int c;
|
|
|
|
if (p)
|
|
t = p;
|
|
if (!t)
|
|
return 0;
|
|
|
|
c = *t;
|
|
while (c == ' ' || c == '\t' )
|
|
c = *++t;
|
|
if (!c) {
|
|
t = 0;
|
|
return 0;
|
|
}
|
|
q = t;
|
|
if (c == '\'') {
|
|
c = *++t;
|
|
q = t;
|
|
while (c && c != '\'')
|
|
c = *++t;
|
|
if (!c) /* unterminated string */
|
|
q = t = 0;
|
|
else
|
|
*t++ = 0;
|
|
} else {
|
|
while (c && c != ' ' && c != '\t' )
|
|
c = *++t;
|
|
*t++ = 0;
|
|
if (!c)
|
|
t = 0;
|
|
}
|
|
return q;
|
|
}
|
|
|
|
#ifdef LOGIN_CAP
|
|
static void
|
|
setprocresources(const char *cname)
|
|
{
|
|
login_cap_t *lc;
|
|
if ((lc = login_getclassbyname(cname, NULL)) != NULL) {
|
|
setusercontext(lc, (struct passwd*)NULL, 0,
|
|
LOGIN_SETPRIORITY | LOGIN_SETRESOURCES |
|
|
LOGIN_SETLOGINCLASS | LOGIN_SETCPUMASK);
|
|
login_close(lc);
|
|
}
|
|
}
|
|
#endif
|