2 * Copyright (c) 1988, 1992 The University of Utah and the Center
3 * for Software Science (CSS).
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * the Center for Software Science of the University of Utah Computer
9 * Science Department. CSS requests users of this software to return
10 * to css-dist@cs.utah.edu any improvements that they make and grant
11 * CSS redistribution rights.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * from: @(#)rbootd.c 8.1 (Berkeley) 6/4/93
39 * From: Utah Hdr: rbootd.c 3.1 92/07/06
40 * Author: Jeff Forys, University of Utah CSS
42 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California. All rights reserved.
43 * @(#)rbootd.c 8.1 (Berkeley) 6/4/93
44 * $FreeBSD: src/libexec/rbootd/rbootd.c,v 1.11.2.1 2001/02/18 02:54:11 kris Exp $
47 #include <sys/param.h>
61 static void usage (void);
64 main(int argc, char *argv[])
66 int c, fd, omask, maxfds;
70 * Close any open file descriptors.
71 * Temporarily leave stdin & stdout open for `-d',
72 * and stderr open for any pre-syslog error messages.
75 int i, nfds = getdtablesize();
77 for (i = 0; i < nfds; i++)
78 if (i != fileno(stdin) && i != fileno(stdout) &&
84 * Parse any arguments.
86 while ((c = getopt(argc, argv, "adi:")) != -1)
100 for (; optind < argc; optind++) {
101 if (ConfigFile == NULL)
102 ConfigFile = argv[optind];
104 warnx("too many config files (`%s' ignored)",
109 if (ConfigFile == NULL) /* use default config file */
110 ConfigFile = DfltConfig;
113 DbgFp = stdout; /* output to stdout */
115 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */
116 (void) signal(SIGUSR2, SIG_IGN);
117 (void) fclose(stderr); /* finished with it */
120 err(1, "can't detach from terminal");
122 (void) signal(SIGUSR1, DebugOn);
123 (void) signal(SIGUSR2, DebugOff);
126 openlog("rbootd", LOG_PID, LOG_DAEMON);
129 * If no interface was specified, get one now.
131 * This is convoluted because we want to get the default interface
132 * name for the syslog("restarted") message. If BpfGetIntfName()
133 * runs into an error, it will return a syslog-able error message
134 * (in `errmsg') which will be displayed here.
136 if (IntfName == NULL) {
139 if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) {
140 syslog(LOG_NOTICE, "restarted (?\?)");
141 /* BpfGetIntfName() returns safe names, using %m */
142 syslog(LOG_ERR, "%s", errmsg);
147 syslog(LOG_NOTICE, "restarted (%s)", IntfName);
149 (void) signal(SIGHUP, ReConfig);
150 (void) signal(SIGINT, Exit);
151 (void) signal(SIGTERM, Exit);
154 * Grab our host name and pid.
156 if (gethostname(MyHost, MAXHOSTNAMELEN - 1) < 0) {
157 syslog(LOG_ERR, "gethostname: %m");
160 MyHost[MAXHOSTNAMELEN - 1] = '\0';
165 * Write proc's pid to a file.
170 if ((fp = fopen(PidFile, "w")) != NULL) {
171 (void) fprintf(fp, "%d\n", (int) MyPid);
174 syslog(LOG_WARNING, "fopen: failed (%s)", PidFile);
179 * All boot files are relative to the boot directory, we might
180 * as well chdir() there to make life easier.
182 if (chdir(BootDir) < 0) {
183 syslog(LOG_ERR, "chdir: %m (%s)", BootDir);
188 * Initial configuration.
190 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */
191 if (GetBootFiles() == 0) /* get list of boot files */
193 if (ParseConfig() == 0) /* parse config file */
197 * Open and initialize a BPF device for the appropriate interface.
198 * If an error is encountered, a message is displayed and Exit()
203 (void) sigsetmask(omask); /* allow reconfig's */
206 * Main loop: receive a packet, determine where it came from,
207 * and if we service this host, call routine to handle request.
213 struct timeval timeout;
219 if (RmpConns == NULL) { /* timeout isnt necessary */
220 nsel = select(maxfds, &r, NULL, NULL, NULL);
222 timeout.tv_sec = RMP_TIMEOUT;
224 nsel = select(maxfds, &r, NULL, NULL, &timeout);
230 syslog(LOG_ERR, "select: %m");
232 } else if (nsel == 0) { /* timeout */
233 DoTimeout(); /* clear stale conns */
237 if (FD_ISSET(fd, &r)) {
239 CLIENT *client, *FindClient();
242 while (BpfRead(&rconn, doread)) {
245 if (DbgFp != NULL) /* display packet */
246 DispPkt(&rconn,DIR_RCVD);
248 omask = sigblock(sigmask(SIGHUP));
251 * If we do not restrict service, set the
252 * client to NULL (ProcessPacket() handles
253 * this). Otherwise, check that we can
254 * service this host; if not, log a message
255 * and ignore the packet.
259 } else if ((client=FindClient(&rconn))==NULL) {
261 "%s: boot packet ignored",
263 (void) sigsetmask(omask);
267 ProcessPacket(&rconn,client);
269 (void) sigsetmask(omask);
278 fprintf(stderr, "usage: rbootd [-ad] [-i interface] [config_file]\n");
283 ** DoTimeout -- Free any connections that have timed out.
292 ** - Timed out connections in `RmpConns' will be freed.
300 (void) gettimeofday(&now, NULL);
303 * For each active connection, if RMP_TIMEOUT seconds have passed
304 * since the last packet was sent, delete the connection.
306 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next)
307 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) {
308 syslog(LOG_WARNING, "%s: connection timed out (%u)",
309 EnetStr(rtmp), rtmp->rmp.r_type);
315 ** FindClient -- Find client associated with a packet.
318 ** rconn - the new packet.
321 ** Pointer to client info if found, NULL otherwise.
327 ** - This routine must be called with SIGHUP blocked since
328 ** a reconfigure can invalidate the information returned.
332 FindClient(RMPCONN *rconn)
336 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next)
337 if (bcmp((char *)&rconn->rmp.hp_hdr.saddr[0],
338 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0)
345 ** Exit -- Log an error message and exit.
348 ** sig - caught signal (or zero if not dying on a signal).
354 ** - This process ceases to exist.
360 syslog(LOG_ERR, "going down on signal %d", sig);
362 syslog(LOG_ERR, "going down with fatal error");
368 ** ReConfig -- Get new list of boot files and reread config files.
377 ** - All active connections are dropped.
378 ** - List of boot-able files is changed.
379 ** - List of clients is changed.
382 ** - This routine must be called with SIGHUP blocked.
387 syslog(LOG_NOTICE, "reconfiguring boot server");
391 if (GetBootFiles() == 0)
394 if (ParseConfig() == 0)
399 ** DebugOff -- Turn off debugging.
408 ** - Debug file is closed.
414 (void) fclose(DbgFp);
420 ** DebugOn -- Turn on debugging.
429 ** - Debug file is opened/truncated if not already opened,
430 ** otherwise do nothing.
436 if ((DbgFp = fopen(DbgFile, "w")) == NULL)
437 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile);