450 lines
10 KiB
C
450 lines
10 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1988, 1992 The University of Utah and the Center
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* for Software Science (CSS).
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* Copyright (c) 1992, 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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* the Center for Software Science of the University of Utah Computer
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* Science Department. CSS requests users of this software to return
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* to css-dist@cs.utah.edu any improvements that they make and grant
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* CSS redistribution rights.
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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. 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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* from: @(#)rbootd.c 8.1 (Berkeley) 6/4/93
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*
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* From: Utah Hdr: rbootd.c 3.1 92/07/06
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* Author: Jeff Forys, University of Utah CSS
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1992, 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 const char sccsid[] = "@(#)rbootd.c 8.1 (Berkeley) 6/4/93";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.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 <unistd.h>
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#include "defs.h"
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static void usage(void) __dead2;
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int
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main(int argc, char *argv[])
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{
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int c, fd, omask, maxfds;
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fd_set rset;
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/*
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* Close any open file descriptors.
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* Temporarily leave stdin & stdout open for `-d',
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* and stderr open for any pre-syslog error messages.
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*/
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{
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int i, nfds = getdtablesize();
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for (i = 0; i < nfds; i++)
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if (i != fileno(stdin) && i != fileno(stdout) &&
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i != fileno(stderr))
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(void) close(i);
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}
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/*
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* Parse any arguments.
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*/
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while ((c = getopt(argc, argv, "adi:")) != -1)
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switch(c) {
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case 'a':
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BootAny++;
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break;
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case 'd':
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DebugFlg++;
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break;
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case 'i':
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IntfName = optarg;
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break;
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default:
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usage();
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}
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for (; optind < argc; optind++) {
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if (ConfigFile == NULL)
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ConfigFile = argv[optind];
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else {
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warnx("too many config files (`%s' ignored)",
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argv[optind]);
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}
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}
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if (ConfigFile == NULL) /* use default config file */
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ConfigFile = DfltConfig;
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if (DebugFlg) {
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DbgFp = stdout; /* output to stdout */
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(void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */
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(void) signal(SIGUSR2, SIG_IGN);
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(void) fclose(stderr); /* finished with it */
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} else {
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if (daemon(0, 0))
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err(1, "can't detach from terminal");
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(void) signal(SIGUSR1, DebugOn);
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(void) signal(SIGUSR2, DebugOff);
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}
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openlog("rbootd", LOG_PID, LOG_DAEMON);
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/*
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* If no interface was specified, get one now.
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*
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* This is convoluted because we want to get the default interface
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* name for the syslog("restarted") message. If BpfGetIntfName()
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* runs into an error, it will return a syslog-able error message
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* (in `errmsg') which will be displayed here.
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*/
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if (IntfName == NULL) {
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char *errmsg;
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if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) {
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/* Backslash to avoid trigraph '??)'. */
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syslog(LOG_NOTICE, "restarted (?\?)");
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/* BpfGetIntfName() returns safe names, using %m */
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syslog(LOG_ERR, "%s", errmsg);
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Exit(0);
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}
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}
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syslog(LOG_NOTICE, "restarted (%s)", IntfName);
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(void) signal(SIGHUP, ReConfig);
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(void) signal(SIGINT, Exit);
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(void) signal(SIGTERM, Exit);
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/*
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* Grab our host name and pid.
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*/
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if (gethostname(MyHost, MAXHOSTNAMELEN - 1) < 0) {
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syslog(LOG_ERR, "gethostname: %m");
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Exit(0);
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}
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MyHost[MAXHOSTNAMELEN - 1] = '\0';
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MyPid = getpid();
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/*
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* Write proc's pid to a file.
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*/
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{
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FILE *fp;
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if ((fp = fopen(PidFile, "w")) != NULL) {
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(void) fprintf(fp, "%d\n", (int) MyPid);
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(void) fclose(fp);
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} else {
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syslog(LOG_WARNING, "fopen: failed (%s)", PidFile);
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}
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}
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/*
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* All boot files are relative to the boot directory, we might
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* as well chdir() there to make life easier.
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*/
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if (chdir(BootDir) < 0) {
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syslog(LOG_ERR, "chdir: %m (%s)", BootDir);
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Exit(0);
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}
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/*
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* Initial configuration.
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*/
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omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */
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if (GetBootFiles() == 0) /* get list of boot files */
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Exit(0);
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if (ParseConfig() == 0) /* parse config file */
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Exit(0);
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/*
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* Open and initialize a BPF device for the appropriate interface.
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* If an error is encountered, a message is displayed and Exit()
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* is called.
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*/
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fd = BpfOpen();
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(void) sigsetmask(omask); /* allow reconfig's */
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/*
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* Main loop: receive a packet, determine where it came from,
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* and if we service this host, call routine to handle request.
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*/
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maxfds = fd + 1;
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FD_ZERO(&rset);
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FD_SET(fd, &rset);
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for (;;) {
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struct timeval timeout;
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fd_set r;
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int nsel;
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r = rset;
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if (RmpConns == NULL) { /* timeout isn't necessary */
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nsel = select(maxfds, &r, NULL, NULL, NULL);
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} else {
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timeout.tv_sec = RMP_TIMEOUT;
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timeout.tv_usec = 0;
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nsel = select(maxfds, &r, NULL, NULL, &timeout);
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}
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if (nsel < 0) {
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if (errno == EINTR)
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continue;
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syslog(LOG_ERR, "select: %m");
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Exit(0);
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} else if (nsel == 0) { /* timeout */
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DoTimeout(); /* clear stale conns */
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continue;
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}
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if (FD_ISSET(fd, &r)) {
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RMPCONN rconn;
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CLIENT *client;
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int doread = 1;
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while (BpfRead(&rconn, doread)) {
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doread = 0;
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if (DbgFp != NULL) /* display packet */
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DispPkt(&rconn,DIR_RCVD);
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omask = sigblock(sigmask(SIGHUP));
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/*
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* If we do not restrict service, set the
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* client to NULL (ProcessPacket() handles
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* this). Otherwise, check that we can
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* service this host; if not, log a message
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* and ignore the packet.
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*/
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if (BootAny) {
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client = NULL;
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} else if ((client=FindClient(&rconn))==NULL) {
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syslog(LOG_INFO,
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"%s: boot packet ignored",
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EnetStr(&rconn));
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(void) sigsetmask(omask);
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continue;
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}
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ProcessPacket(&rconn,client);
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(void) sigsetmask(omask);
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}
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}
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}
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: rbootd [-ad] [-i interface] [config_file]\n");
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exit (1);
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}
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/*
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** DoTimeout -- Free any connections that have timed out.
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**
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** Parameters:
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** None.
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**
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** Returns:
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** Nothing.
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**
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** Side Effects:
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** - Timed out connections in `RmpConns' will be freed.
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*/
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void
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DoTimeout(void)
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{
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RMPCONN *rtmp;
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time_t now;
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/*
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* For each active connection, if RMP_TIMEOUT seconds have passed
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* since the last packet was sent, delete the connection.
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*/
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now = time(NULL);
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for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next)
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if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now) {
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syslog(LOG_WARNING, "%s: connection timed out (%u)",
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EnetStr(rtmp), rtmp->rmp.r_type);
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RemoveConn(rtmp);
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}
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}
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/*
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** FindClient -- Find client associated with a packet.
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**
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** Parameters:
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** rconn - the new packet.
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**
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** Returns:
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** Pointer to client info if found, NULL otherwise.
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**
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** Side Effects:
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** None.
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**
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** Warnings:
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** - This routine must be called with SIGHUP blocked since
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** a reconfigure can invalidate the information returned.
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*/
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CLIENT *
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FindClient(RMPCONN *rconn)
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{
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CLIENT *ctmp;
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for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next)
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if (bcmp((char *)&rconn->rmp.hp_hdr.saddr[0],
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(char *)&ctmp->addr[0], RMP_ADDRLEN) == 0)
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break;
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return(ctmp);
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}
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/*
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** Exit -- Log an error message and exit.
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**
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** Parameters:
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** sig - caught signal (or zero if not dying on a signal).
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**
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** Returns:
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** Does not return.
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**
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** Side Effects:
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** - This process ceases to exist.
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*/
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void
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Exit(int sig)
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{
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if (sig > 0)
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syslog(LOG_ERR, "going down on signal %d", sig);
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else
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syslog(LOG_ERR, "going down with fatal error");
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BpfClose();
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exit(1);
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}
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/*
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** ReConfig -- Get new list of boot files and reread config files.
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**
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** Parameters:
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** None.
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**
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** Returns:
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** Nothing.
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**
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** Side Effects:
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** - All active connections are dropped.
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** - List of boot-able files is changed.
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** - List of clients is changed.
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**
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** Warnings:
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** - This routine must be called with SIGHUP blocked.
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*/
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void
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ReConfig(int signo __unused)
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{
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syslog(LOG_NOTICE, "reconfiguring boot server");
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FreeConns();
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if (GetBootFiles() == 0)
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Exit(0);
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if (ParseConfig() == 0)
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Exit(0);
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}
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/*
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** DebugOff -- Turn off debugging.
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**
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** Parameters:
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** None.
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**
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** Returns:
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** Nothing.
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**
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** Side Effects:
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** - Debug file is closed.
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*/
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void
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DebugOff(int signo __unused)
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{
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if (DbgFp != NULL)
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(void) fclose(DbgFp);
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DbgFp = NULL;
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}
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/*
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** DebugOn -- Turn on debugging.
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**
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** Parameters:
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** None.
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**
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** Returns:
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** Nothing.
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**
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** Side Effects:
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** - Debug file is opened/truncated if not already opened,
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** otherwise do nothing.
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*/
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void
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DebugOn(int signo __unused)
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{
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if (DbgFp == NULL) {
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if ((DbgFp = fopen(DbgFile, "w")) == NULL)
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syslog(LOG_ERR, "can't open debug file (%s)", DbgFile);
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}
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}
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