rbootd.c revision 1.16 1 /* $NetBSD: rbootd.c,v 1.16 2002/09/19 03:04:13 mycroft Exp $ */
2
3 /*
4 * Copyright (c) 1988, 1992 The University of Utah and the Center
5 * for Software Science (CSS).
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * the Center for Software Science of the University of Utah Computer
11 * Science Department. CSS requests users of this software to return
12 * to css-dist (at) cs.utah.edu any improvements that they make and grant
13 * CSS redistribution rights.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. All advertising materials mentioning features or use of this software
24 * must display the following acknowledgement:
25 * This product includes software developed by the University of
26 * California, Berkeley and its contributors.
27 * 4. Neither the name of the University nor the names of its contributors
28 * may be used to endorse or promote products derived from this software
29 * without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * SUCH DAMAGE.
42 *
43 * from: @(#)rbootd.c 8.1 (Berkeley) 6/4/93
44 *
45 * From: Utah Hdr: rbootd.c 3.1 92/07/06
46 * Author: Jeff Forys, University of Utah CSS
47 */
48
49 #include <sys/cdefs.h>
50 #ifndef lint
51 __COPYRIGHT(
52 "@(#) Copyright (c) 1992, 1993\n\
53 The Regents of the University of California. All rights reserved.\n");
54 #endif /* not lint */
55
56 #ifndef lint
57 #if 0
58 static char sccsid[] = "@(#)rbootd.c 8.1 (Berkeley) 6/4/93";
59 #else
60 __RCSID("$NetBSD: rbootd.c,v 1.16 2002/09/19 03:04:13 mycroft Exp $");
61 #endif
62 #endif /* not lint */
63
64 #include <sys/param.h>
65 #include <sys/time.h>
66 #include <sys/poll.h>
67 #include <ctype.h>
68 #include <err.h>
69 #include <errno.h>
70 #include <fcntl.h>
71 #include <signal.h>
72 #include <stdio.h>
73 #include <stdlib.h>
74 #include <string.h>
75 #include <syslog.h>
76 #include <unistd.h>
77 #include <util.h>
78 #include "defs.h"
79
80 int main __P((int, char *[]));
81
82 int
83 main(argc, argv)
84 int argc;
85 char *argv[];
86 {
87 int c, fd, omask;
88 struct pollfd set[1];
89
90 /*
91 * Close any open file descriptors.
92 * Temporarily leave stdin & stdout open for `-d',
93 * and stderr open for any pre-syslog error messages.
94 */
95 {
96 int i, nfds = getdtablesize();
97
98 for (i = 0; i < nfds; i++)
99 if (i != STDIN_FILENO && i != STDOUT_FILENO &&
100 i != STDERR_FILENO)
101 (void) close(i);
102 }
103
104 /*
105 * Parse any arguments.
106 */
107 while ((c = getopt(argc, argv, "adi:")) != -1)
108 switch(c) {
109 case 'a':
110 BootAny++;
111 break;
112 case 'd':
113 DebugFlg++;
114 break;
115 case 'i':
116 IntfName = optarg;
117 break;
118 }
119 for (; optind < argc; optind++) {
120 if (ConfigFile == NULL)
121 ConfigFile = argv[optind];
122 else {
123 warnx("too many config files (`%s' ignored)",
124 argv[optind]);
125 }
126 }
127
128 if (ConfigFile == NULL) /* use default config file */
129 ConfigFile = DfltConfig;
130
131 if (DebugFlg) {
132 DbgFp = stdout; /* output to stdout */
133
134 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */
135 (void) signal(SIGUSR2, SIG_IGN);
136 (void) fclose(stderr); /* finished with it */
137 } else {
138 if (daemon(0, 0))
139 err(1, "can't detach from terminal");
140 pidfile(NULL);
141
142 (void) signal(SIGUSR1, DebugOn);
143 (void) signal(SIGUSR2, DebugOff);
144 }
145
146 openlog("rbootd", LOG_PID, LOG_DAEMON);
147
148 /*
149 * If no interface was specified, get one now.
150 *
151 * This is convoluted because we want to get the default interface
152 * name for the syslog("restarted") message. If BpfGetIntfName()
153 * runs into an error, it will return a syslog-able error message
154 * (in `errmsg') which will be displayed here.
155 */
156 if (IntfName == NULL) {
157 char *errmsg;
158
159 if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) {
160 /* backslash to avoid trigraph ??) */
161 syslog(LOG_NOTICE, "restarted (?\?)");
162 syslog(LOG_ERR, errmsg);
163 Exit(0);
164 }
165 }
166
167 syslog(LOG_NOTICE, "restarted (%s)", IntfName);
168
169 (void) signal(SIGHUP, ReConfig);
170 (void) signal(SIGINT, Exit);
171 (void) signal(SIGTERM, Exit);
172
173 /*
174 * Grab our host name and pid.
175 */
176 if (gethostname(MyHost, sizeof MyHost) < 0) {
177 syslog(LOG_ERR, "gethostname: %m");
178 Exit(0);
179 }
180 MyHost[sizeof(MyHost) - 1] = '\0';
181
182 /*
183 * All boot files are relative to the boot directory, we might
184 * as well chdir() there to make life easier.
185 */
186 if (chdir(BootDir) < 0) {
187 syslog(LOG_ERR, "chdir: %m (%s)", BootDir);
188 Exit(0);
189 }
190
191 /*
192 * Initial configuration.
193 */
194 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */
195 if (GetBootFiles() == 0) /* get list of boot files */
196 Exit(0);
197 if (ParseConfig() == 0) /* parse config file */
198 Exit(0);
199
200 /*
201 * Open and initialize a BPF device for the appropriate interface.
202 * If an error is encountered, a message is displayed and Exit()
203 * is called.
204 */
205 fd = BpfOpen();
206
207 (void) sigsetmask(omask); /* allow reconfig's */
208
209 /*
210 * Main loop: receive a packet, determine where it came from,
211 * and if we service this host, call routine to handle request.
212 */
213 set[0].fd = fd;
214 set[0].events = POLLIN;
215 for (;;) {
216 int nsel;
217
218 nsel = poll(set, 1, RmpConns ? RMP_TIMEOUT * 1000 : INFTIM);
219
220 if (nsel < 0) {
221 if (errno == EINTR)
222 continue;
223 syslog(LOG_ERR, "poll: %m");
224 Exit(0);
225 } else if (nsel == 0) { /* timeout */
226 DoTimeout(); /* clear stale conns */
227 continue;
228 }
229
230 if (set[0].revents & POLLIN) {
231 RMPCONN rconn;
232 CLIENT *client;
233 int doread = 1;
234
235 while (BpfRead(&rconn, doread)) {
236 doread = 0;
237
238 if (DbgFp != NULL) /* display packet */
239 DispPkt(&rconn,DIR_RCVD);
240
241 omask = sigblock(sigmask(SIGHUP));
242
243 /*
244 * If we do not restrict service, set the
245 * client to NULL (ProcessPacket() handles
246 * this). Otherwise, check that we can
247 * service this host; if not, log a message
248 * and ignore the packet.
249 */
250 if (BootAny) {
251 client = NULL;
252 } else if ((client=FindClient(&rconn))==NULL) {
253 syslog(LOG_INFO,
254 "%s: boot packet ignored",
255 EnetStr(&rconn));
256 (void) sigsetmask(omask);
257 continue;
258 }
259
260 ProcessPacket(&rconn,client);
261
262 (void) sigsetmask(omask);
263 }
264 }
265 }
266 }
267
268 /*
269 ** DoTimeout -- Free any connections that have timed out.
270 **
271 ** Parameters:
272 ** None.
273 **
274 ** Returns:
275 ** Nothing.
276 **
277 ** Side Effects:
278 ** - Timed out connections in `RmpConns' will be freed.
279 */
280 void
281 DoTimeout()
282 {
283 RMPCONN *rtmp;
284 struct timeval now;
285
286 (void) gettimeofday(&now, (struct timezone *)0);
287
288 /*
289 * For each active connection, if RMP_TIMEOUT seconds have passed
290 * since the last packet was sent, delete the connection.
291 */
292 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next)
293 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) {
294 syslog(LOG_WARNING, "%s: connection timed out (%u)",
295 EnetStr(rtmp), rtmp->rmp.r_type);
296 RemoveConn(rtmp);
297 }
298 }
299
300 /*
301 ** FindClient -- Find client associated with a packet.
302 **
303 ** Parameters:
304 ** rconn - the new packet.
305 **
306 ** Returns:
307 ** Pointer to client info if found, NULL otherwise.
308 **
309 ** Side Effects:
310 ** None.
311 **
312 ** Warnings:
313 ** - This routine must be called with SIGHUP blocked since
314 ** a reconfigure can invalidate the information returned.
315 */
316
317 CLIENT *
318 FindClient(rconn)
319 RMPCONN *rconn;
320 {
321 CLIENT *ctmp;
322
323 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next)
324 if (memcmp((char *)&rconn->rmp.hp_hdr.saddr[0],
325 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0)
326 break;
327
328 return(ctmp);
329 }
330
331 /*
332 ** Exit -- Log an error message and exit.
333 **
334 ** Parameters:
335 ** sig - caught signal (or zero if not dying on a signal).
336 **
337 ** Returns:
338 ** Does not return.
339 **
340 ** Side Effects:
341 ** - This process ceases to exist.
342 */
343 void
344 Exit(sig)
345 int sig;
346 {
347 if (sig > 0)
348 syslog(LOG_ERR, "going down on signal %d", sig);
349 else
350 syslog(LOG_ERR, "going down with fatal error");
351 BpfClose();
352 exit(1);
353 }
354
355 /*
356 ** ReConfig -- Get new list of boot files and reread config files.
357 **
358 ** Parameters:
359 ** None.
360 **
361 ** Returns:
362 ** Nothing.
363 **
364 ** Side Effects:
365 ** - All active connections are dropped.
366 ** - List of boot-able files is changed.
367 ** - List of clients is changed.
368 **
369 ** Warnings:
370 ** - This routine must be called with SIGHUP blocked.
371 */
372 void
373 ReConfig(signo)
374 int signo;
375 {
376 syslog(LOG_NOTICE, "reconfiguring boot server");
377
378 FreeConns();
379
380 if (GetBootFiles() == 0)
381 Exit(0);
382
383 if (ParseConfig() == 0)
384 Exit(0);
385 }
386
387 /*
388 ** DebugOff -- Turn off debugging.
389 **
390 ** Parameters:
391 ** None.
392 **
393 ** Returns:
394 ** Nothing.
395 **
396 ** Side Effects:
397 ** - Debug file is closed.
398 */
399 void
400 DebugOff(signo)
401 int signo;
402 {
403 if (DbgFp != NULL)
404 (void) fclose(DbgFp);
405
406 DbgFp = NULL;
407 }
408
409 /*
410 ** DebugOn -- Turn on debugging.
411 **
412 ** Parameters:
413 ** None.
414 **
415 ** Returns:
416 ** Nothing.
417 **
418 ** Side Effects:
419 ** - Debug file is opened/truncated if not already opened,
420 ** otherwise do nothing.
421 */
422 void
423 DebugOn(signo)
424 int signo;
425 {
426 if (DbgFp == NULL) {
427 if ((DbgFp = fopen(DbgFile, "w")) == NULL)
428 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile);
429 }
430 }
431