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. All advertising materials mentioning features or use of this software
22 * must display the following acknowledgement:
23 * This product includes software developed by the University of
24 * California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 * may be used to endorse or promote products derived from this software
27 * without specific prior written permission.
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * from: @(#)rbootd.c 8.1 (Berkeley) 6/4/93
43 * From: Utah Hdr: rbootd.c 3.1 92/07/06
44 * Author: Jeff Forys, University of Utah CSS
46 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California. All rights reserved.
47 * @(#)rbootd.c 8.1 (Berkeley) 6/4/93
48 * $FreeBSD: src/libexec/rbootd/rbootd.c,v 1.11.2.1 2001/02/18 02:54:11 kris Exp $
51 #include <sys/param.h>
65 static void usage (void);
68 main(int argc, char *argv[])
70 int c, fd, omask, maxfds;
74 * Close any open file descriptors.
75 * Temporarily leave stdin & stdout open for `-d',
76 * and stderr open for any pre-syslog error messages.
79 int i, nfds = getdtablesize();
81 for (i = 0; i < nfds; i++)
82 if (i != fileno(stdin) && i != fileno(stdout) &&
88 * Parse any arguments.
90 while ((c = getopt(argc, argv, "adi:")) != -1)
104 for (; optind < argc; optind++) {
105 if (ConfigFile == NULL)
106 ConfigFile = argv[optind];
108 warnx("too many config files (`%s' ignored)",
113 if (ConfigFile == NULL) /* use default config file */
114 ConfigFile = DfltConfig;
117 DbgFp = stdout; /* output to stdout */
119 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */
120 (void) signal(SIGUSR2, SIG_IGN);
121 (void) fclose(stderr); /* finished with it */
124 err(1, "can't detach from terminal");
126 (void) signal(SIGUSR1, DebugOn);
127 (void) signal(SIGUSR2, DebugOff);
130 openlog("rbootd", LOG_PID, LOG_DAEMON);
133 * If no interface was specified, get one now.
135 * This is convoluted because we want to get the default interface
136 * name for the syslog("restarted") message. If BpfGetIntfName()
137 * runs into an error, it will return a syslog-able error message
138 * (in `errmsg') which will be displayed here.
140 if (IntfName == NULL) {
143 if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) {
144 syslog(LOG_NOTICE, "restarted (?\?)");
145 /* BpfGetIntfName() returns safe names, using %m */
146 syslog(LOG_ERR, "%s", errmsg);
151 syslog(LOG_NOTICE, "restarted (%s)", IntfName);
153 (void) signal(SIGHUP, ReConfig);
154 (void) signal(SIGINT, Exit);
155 (void) signal(SIGTERM, Exit);
158 * Grab our host name and pid.
160 if (gethostname(MyHost, MAXHOSTNAMELEN - 1) < 0) {
161 syslog(LOG_ERR, "gethostname: %m");
164 MyHost[MAXHOSTNAMELEN - 1] = '\0';
169 * Write proc's pid to a file.
174 if ((fp = fopen(PidFile, "w")) != NULL) {
175 (void) fprintf(fp, "%d\n", (int) MyPid);
178 syslog(LOG_WARNING, "fopen: failed (%s)", PidFile);
183 * All boot files are relative to the boot directory, we might
184 * as well chdir() there to make life easier.
186 if (chdir(BootDir) < 0) {
187 syslog(LOG_ERR, "chdir: %m (%s)", BootDir);
192 * Initial configuration.
194 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */
195 if (GetBootFiles() == 0) /* get list of boot files */
197 if (ParseConfig() == 0) /* parse config file */
201 * Open and initialize a BPF device for the appropriate interface.
202 * If an error is encountered, a message is displayed and Exit()
207 (void) sigsetmask(omask); /* allow reconfig's */
210 * Main loop: receive a packet, determine where it came from,
211 * and if we service this host, call routine to handle request.
217 struct timeval timeout;
223 if (RmpConns == NULL) { /* timeout isnt necessary */
224 nsel = select(maxfds, &r, NULL, NULL, NULL);
226 timeout.tv_sec = RMP_TIMEOUT;
228 nsel = select(maxfds, &r, NULL, NULL, &timeout);
234 syslog(LOG_ERR, "select: %m");
236 } else if (nsel == 0) { /* timeout */
237 DoTimeout(); /* clear stale conns */
241 if (FD_ISSET(fd, &r)) {
243 CLIENT *client, *FindClient();
246 while (BpfRead(&rconn, doread)) {
249 if (DbgFp != NULL) /* display packet */
250 DispPkt(&rconn,DIR_RCVD);
252 omask = sigblock(sigmask(SIGHUP));
255 * If we do not restrict service, set the
256 * client to NULL (ProcessPacket() handles
257 * this). Otherwise, check that we can
258 * service this host; if not, log a message
259 * and ignore the packet.
263 } else if ((client=FindClient(&rconn))==NULL) {
265 "%s: boot packet ignored",
267 (void) sigsetmask(omask);
271 ProcessPacket(&rconn,client);
273 (void) sigsetmask(omask);
282 fprintf(stderr, "usage: rbootd [-ad] [-i interface] [config_file]\n");
287 ** DoTimeout -- Free any connections that have timed out.
296 ** - Timed out connections in `RmpConns' will be freed.
304 (void) gettimeofday(&now, NULL);
307 * For each active connection, if RMP_TIMEOUT seconds have passed
308 * since the last packet was sent, delete the connection.
310 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next)
311 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) {
312 syslog(LOG_WARNING, "%s: connection timed out (%u)",
313 EnetStr(rtmp), rtmp->rmp.r_type);
319 ** FindClient -- Find client associated with a packet.
322 ** rconn - the new packet.
325 ** Pointer to client info if found, NULL otherwise.
331 ** - This routine must be called with SIGHUP blocked since
332 ** a reconfigure can invalidate the information returned.
336 FindClient(RMPCONN *rconn)
340 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next)
341 if (bcmp((char *)&rconn->rmp.hp_hdr.saddr[0],
342 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0)
349 ** Exit -- Log an error message and exit.
352 ** sig - caught signal (or zero if not dying on a signal).
358 ** - This process ceases to exist.
364 syslog(LOG_ERR, "going down on signal %d", sig);
366 syslog(LOG_ERR, "going down with fatal error");
372 ** ReConfig -- Get new list of boot files and reread config files.
381 ** - All active connections are dropped.
382 ** - List of boot-able files is changed.
383 ** - List of clients is changed.
386 ** - This routine must be called with SIGHUP blocked.
391 syslog(LOG_NOTICE, "reconfiguring boot server");
395 if (GetBootFiles() == 0)
398 if (ParseConfig() == 0)
403 ** DebugOff -- Turn off debugging.
412 ** - Debug file is closed.
418 (void) fclose(DbgFp);
424 ** DebugOn -- Turn on debugging.
433 ** - Debug file is opened/truncated if not already opened,
434 ** otherwise do nothing.
440 if ((DbgFp = fopen(DbgFile, "w")) == NULL)
441 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile);