464 lines
11 KiB
C
464 lines
11 KiB
C
/*
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* Copyright (c) 1986, 1987, 1992 Daniel D. Lanciani.
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* All rights reserved.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by
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* Daniel D. Lanciani.
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* 4. The name of the author may not
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* 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 Daniel D. Lanciani ``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 Daniel D. Lanciani 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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* $Id: init.c,v 1.7 1993/06/10 01:03:02 cgd Exp $
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*/
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/signal.h>
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#include <sys/wait.h>
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#include <setjmp.h>
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#include <ttyent.h>
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#include <unistd.h>
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#ifdef SECURE_CONSOLE
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#include <pwd.h>
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#endif
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#ifdef USE_DEVFS
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#include <sys/mount.h>
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#endif
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#define NTTY 32 /* max ttys */
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#define NARG 16 /* max args to login/getty */
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/* internal flags */
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#define TTY_SEEN 0x8000
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#define TTY_DIFF 0x4000
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#define TTY_LOGIN 0x2000
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/* non-standard tty_logout: rerun login/getty with -o switch to clean line */
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#ifndef TTY_LOGOUT
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#define TTY_LOGOUT 0x1000
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#endif
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/* non-standard tty_open: open device for login/getty */
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#ifndef TTY_OPEN
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#define TTY_OPEN 0x0800
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#endif
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#define isspace(c) ((c) == ' ' || (c) == '\t')
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struct ttytab {
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char *tt_name;
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char *tt_getty;
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char *tt_type;
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int tt_status;
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int tt_pid;
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} ttytab[NTTY], *ttytabend = ttytab;
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int drain, sflag;
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char arg[128], nam[64], term[64], *env[] = { term, 0 };
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jmp_buf single, reread;
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char *Reboot = "autoboot";
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char *newstring(), *malloc();
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extern int errno;
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/* signal state of child process */
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#define SIGNALSFORCHILD \
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signal(SIGHUP, SIG_DFL); signal(SIGINT, SIG_DFL); \
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signal(SIGTERM, SIG_DFL); signal(SIGALRM, SIG_DFL); \
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signal(SIGTSTP, SIG_DFL); signal(SIGCHLD, SIG_DFL); \
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signal(SIGTTIN, SIG_DFL); signal(SIGTTOU, SIG_DFL); \
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sigsetmask( 0); /* 04 Sep 92*/
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/* SIGHUP: reread /etc/ttys */
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void
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shup(sig)
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{
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longjmp(reread, 1);
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}
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/* SIGALRM: abort wait and go single user */
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void
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salrm(sig)
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{
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signal(SIGALRM, SIG_DFL);
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warn("process hung");
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longjmp(single, 1);
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}
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/* SIGTERM: go single user */
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void
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sterm(sig)
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{
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register struct ttytab *tt;
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if (!Reboot) {
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for(tt = ttytab; tt < ttytabend; tt++) {
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free(tt->tt_name);
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free(tt->tt_getty);
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free(tt->tt_type);
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}
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ttytabend = ttytab;
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/* give processes time to exit cleanly */ /* 15 Aug 92*/
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kill(-1, SIGTERM);
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sleep(10);
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/* Now murder them */
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kill(-1, SIGKILL);
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kill(-1, SIGCONT);
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signal(SIGALRM, salrm);
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alarm(30);
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while(wait((int *)0) > 0);
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alarm(0);
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signal(SIGALRM, SIG_DFL);
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longjmp(single, 1);
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}
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}
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/* SIGTSTP: drain system */
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void
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ststp(sig)
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{
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drain = 1;
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}
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/* init [-s] [-f] */
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main(argc, argv)
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char **argv;
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{
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register int pid;
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register struct ttytab *tt;
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struct ttyent *ty;
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int status;
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long mask = sigblock(sigmask(SIGHUP) | sigmask(SIGTERM));
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/* did some idiot try to run us? */
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if(getpid() != 1) {
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writes(2,"init: sorry, system daemon, runnable only by system\n");
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exit(0xff);
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}
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/* allocate a session for init */
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(void) setsid();
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/* protect against signals, listen for outside requests */
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signal(SIGHUP, shup);
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signal(SIGTSTP, ststp);
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signal (SIGTTIN, SIG_IGN);
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signal (SIGTTOU, SIG_IGN);
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signal (SIGCHLD, SIG_IGN);
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signal (SIGINT, SIG_IGN);
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/* handle arguments, if any */
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if(argc > 1)
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if(!strcmp(argv[1], "-s"))
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sflag++;
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else if(!strcmp(argv[1], "-f"))
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Reboot = 0;
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#ifdef USE_DEVFS
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if (mount(MOUNT_DEVFS, "/dev", 0, (caddr_t) 0) < 0) {
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writes(2, "init: couldn't mount /dev\n");
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perror( " mount");
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writes(2, " trying to continue...\n");
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}
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#endif
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top:
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/* Single user mode? */
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if(sflag) {
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sflag = 0;
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status = 1;
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} else {
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/* otherwise, execute /etc/rc */
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if (access("/etc/rc", F_OK) == 0) {
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signal(SIGTERM, SIG_IGN); /* XXX */
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if((pid = fork()) < 0)
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fatal("fork");
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else if(!pid) {
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/* signals, to default state */
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SIGNALSFORCHILD;
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/* clean off console */
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revoke("/dev/console");
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/* create a shell */
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login_tty(open("/dev/console", 2));
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execl("/bin/sh", "sh", "/etc/rc", Reboot, (char *)0);
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_exit(127);
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}
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Reboot = 0; /* 31 Jul 92*/
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while(wait(&status) != pid);
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/* if we are about to be rebooted, then wait for it */
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if (WIFSIGNALED(status) && WTERMSIG(status) == SIGKILL)
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pause();
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} else { status = 1; sflag = 1; goto top; }
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}
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signal(SIGTERM, sterm);
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Reboot = 0;
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/* do single user shell on console */
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if (setjmp(single) || status) {
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#ifdef SECURE_CONSOLE
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struct ttyent *ttyp;
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struct passwd *passp;
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char *pass;
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static const char banner[] =
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"Enter root password, or Control-D to go multi-user\n";
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#endif
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if((pid = fork()) < 0)
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fatal("fork");
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else if(!pid) {
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/* signals, to default state */
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SIGNALSFORCHILD;
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/* clean off console */
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revoke("/dev/console");
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/* do open and configuration of console */
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login_tty(open("/dev/console", 2));
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#ifdef SECURE_CONSOLE
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/* if the console isn't secure, check the root PW */
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ttyp = getttynam("console");
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if (!ttyp) {
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/* don't have an entry for "console", probably
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* have one for /dev/vga
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*/
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ttyp = getttynam("vga");
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}
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passp = getpwnam("root");
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if (ttyp && ((ttyp->ty_status & TTY_SECURE) == 0) &&
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passp) {
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write(2, banner, sizeof(banner) - 1);
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do {
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pass = getpass("Password:");
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if ((pass == 0) || (*pass == '\0'))
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_exit(0); /* got control-d */
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pass = crypt(pass, passp->pw_passwd);
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} while (strcmp(pass, passp->pw_passwd) != 0);
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}
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#endif
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execl("/bin/sh", "-", (char *)0);
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_exit(127);
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}
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while(wait(&status) != pid);
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while(drain) /* 31 Jul 92*/
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pause();
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goto top;
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}
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/* multiuser mode, traipse through table */
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setttyent();
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for(tt = ttytab; (ty = getttyent()) && tt < &ttytab[NTTY]; tt++) {
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tt->tt_name = newstring(ty->ty_name);
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tt->tt_getty = newstring(ty->ty_getty);
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tt->tt_type = newstring(ty->ty_type);
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tt->tt_status = ty->ty_status;
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}
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ttytabend = tt;
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endttyent();
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for(tt = ttytab; tt < ttytabend; getty(tt++));
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/* if we receive a request to reread the table, come here */
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if(setjmp(reread)) {
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/* first pass. find and clean the entries that have changed */
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setttyent();
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while(ty = getttyent()) {
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for(tt = ttytab; tt < ttytabend; tt++)
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if(!strcmp(tt->tt_name, ty->ty_name)) {
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/* if a process present, mark */
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if((tt->tt_status & ~TTY_LOGIN) !=ty->ty_status)
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tt->tt_status = ty->ty_status |TTY_DIFF;
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if(strcmp(tt->tt_getty, ty->ty_getty)) {
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free(tt->tt_getty);
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tt->tt_getty = newstring(ty->ty_getty);
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tt->tt_status |= TTY_DIFF;
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}
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if(strcmp(tt->tt_type, ty->ty_type)) {
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free(tt->tt_type);
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tt->tt_type = newstring(ty->ty_type);
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tt->tt_status |= TTY_DIFF;
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}
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if(((tt->tt_status |= TTY_SEEN) & TTY_DIFF)
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&& tt->tt_pid > 1)
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kill(tt->tt_pid, 9);
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break;
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}
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if(tt == ttytabend && tt < &ttytab[NTTY]) {
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tt->tt_name = newstring(ty->ty_name);
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tt->tt_getty = newstring(ty->ty_getty);
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tt->tt_type = newstring(ty->ty_type);
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tt->tt_status = ty->ty_status |
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TTY_SEEN | TTY_DIFF;
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ttytabend++;
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}
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}
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endttyent();
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/* second pass. offer gettys on previously cleaned entries,
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and garbage collect "dead" entries */
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for(tt = ttytab; tt < ttytabend; tt++)
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if(tt->tt_status & TTY_SEEN) {
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tt->tt_status &= ~TTY_SEEN;
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if(tt->tt_status & TTY_DIFF) {
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tt->tt_status &= ~TTY_DIFF;
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getty(tt);
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}
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}
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else {
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if(tt->tt_pid > 1)
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kill(tt->tt_pid, 9);
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free(tt->tt_name);
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free(tt->tt_getty);
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free(tt->tt_type);
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pid = tt - ttytab;
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for(tt++; tt < ttytabend; tt++)
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tt[-1] = *tt;
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ttytabend--;
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tt = &ttytab[pid];
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}
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}
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drain = 0;
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/* listen for terminating gettys and sessions, and process them */
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while(1) {
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sigsetmask(mask);
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pid = wait(&status);
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sigblock(sigmask(SIGHUP) | sigmask(SIGTERM));
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if(pid < 0) {
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sleep(5);
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continue;
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}
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for(tt = ttytab; tt < ttytabend; tt++)
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if(pid == tt->tt_pid) {
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/* 24 Jul 92*/ if (logout(tt->tt_name)) logwtmp(tt->tt_name,"","");
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if(drain && !(tt->tt_status & TTY_LOGIN)) {
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free(tt->tt_name);
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free(tt->tt_getty);
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free(tt->tt_type);
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for(tt++; tt < ttytabend; tt++)
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tt[-1] = *tt;
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ttytabend--;
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}
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else
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getty(tt);
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break;
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}
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}
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}
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/* process a getty for a "line". N.B. by having getty do open, init
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is not limited by filedescriptors for number of possible users */
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getty(tt)
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struct ttytab *tt;
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{
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char *sargv[NARG];
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register char *p = arg, **sp = sargv;
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if(!(tt->tt_status & TTY_ON)) {
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tt->tt_pid = -1;
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return;
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}
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if((tt->tt_pid = fork()) < 0)
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fatal("getty fork");
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else if(tt->tt_pid) {
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if(tt->tt_status & TTY_LOGOUT)
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tt->tt_status ^= TTY_LOGIN;
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return;
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}
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signal(SIGHUP, SIG_DFL);
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signal(SIGTERM, SIG_DFL);
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signal(SIGTSTP, SIG_DFL);
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sigsetmask(0);
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strcpy(p, tt->tt_getty);
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while(sp < &sargv[NARG - 2]) {
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while(isspace(*p))
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p++;
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if(!*p)
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break;
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*sp++ = p;
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while(!isspace(*p) && *p)
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p++;
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if(!*p)
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break;
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*p++ = 0;
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}
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strcpy(nam, tt->tt_name);
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*sp++ = nam;
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*sp = 0;
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p = *sargv;
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strcpy(term, "TERM=");
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strcat(term, tt->tt_type);
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execve(p, sargv, env);
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bad:
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sleep(30);
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fatal(tt->tt_name);
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}
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char *
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newstring(s)
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register char *s;
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{
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register char *n;
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if(!(n = malloc(strlen(s) + 1)))
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fatal("out of memory");
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strcpy(n, s);
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return(n);
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}
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warn(s)
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char *s;
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{
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register int pid;
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int fd;
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fd = open("/dev/console", 2);
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writes(fd, "init WARNING: ");
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writes(fd, s);
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write(fd, "\n", 1);
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close(fd);
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}
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fatal(s)
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char *s;
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{
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login_tty(open("/dev/console", 2));
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writes(2, "init FATAL error: ");
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perror(s);
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_exit(1); /* 04 Sep 92*/
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/* panic: init died */
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}
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writes(n, s)
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char *s;
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{
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write(n, s, strlen(s));
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}
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