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: @(#)rmpproto.c 8.1 (Berkeley) 6/4/93
39 * From: Utah Hdr: rmpproto.c 3.1 92/07/06
40 * Author: Jeff Forys, University of Utah CSS
45 static const char sccsid[] = "@(#)rmpproto.c 8.1 (Berkeley) 6/4/93";
47 static const char rcsid[] =
51 #include <sys/param.h>
53 #include <netinet/in.h>
64 ** ProcessPacket -- determine packet type and do what's required.
66 ** An RMP BOOT packet has been received. Look at the type field
67 ** and process Boot Requests, Read Requests, and Boot Complete
68 ** packets. Any other type will be dropped with a warning msg.
71 ** rconn - the new connection
72 ** client - list of files available to this host
78 ** - If this is a valid boot request, it will be added to
79 ** the linked list of outstanding requests (RmpConns).
80 ** - If this is a valid boot complete, its associated
81 ** entry in RmpConns will be deleted.
82 ** - Also, unless we run out of memory, a reply will be
83 ** sent to the host that sent the packet.
86 ProcessPacket(RMPCONN *rconn, CLIENT *client)
88 struct rmp_packet *rmp;
91 rmp = &rconn->rmp; /* cache pointer to RMP packet */
93 switch(rmp->r_type) { /* do what we came here to do */
94 case RMP_BOOT_REQ: /* boot request */
95 if ((rconnout = NewConn(rconn)) == NULL)
99 * If the Session ID is 0xffff, this is a "probe"
100 * packet and we do not want to add the connection
101 * to the linked list of active connections. There
102 * are two types of probe packets, if the Sequence
103 * Number is 0 they want to know our host name, o/w
104 * they want the name of the file associated with
105 * the number spec'd by the Sequence Number.
107 * If this is an actual boot request, open the file
108 * and send a reply. If SendBootRepl() does not
109 * return 0, add the connection to the linked list
110 * of active connections, otherwise delete it since
111 * an error was encountered.
113 if (ntohs(rmp->r_brq.rmp_session) == RMP_PROBESID) {
114 if (WORDZE(rmp->r_brq.rmp_seqno))
115 (void) SendServerID(rconnout);
117 (void) SendFileNo(rmp, rconnout,
118 client? client->files:
122 if (SendBootRepl(rmp, rconnout,
123 client? client->files: BootFiles))
130 case RMP_BOOT_REPL: /* boot reply (not valid) */
131 syslog(LOG_WARNING, "%s: sent a boot reply",
135 case RMP_READ_REQ: /* read request */
137 * Send a portion of the boot file.
139 (void) SendReadRepl(rconn);
142 case RMP_READ_REPL: /* read reply (not valid) */
143 syslog(LOG_WARNING, "%s: sent a read reply",
147 case RMP_BOOT_DONE: /* boot complete */
149 * Remove the entry from the linked list of active
152 (void) BootDone(rconn);
155 default: /* unknown RMP packet type */
156 syslog(LOG_WARNING, "%s: unknown packet type (%u)",
157 EnetStr(rconn), rmp->r_type);
162 ** SendServerID -- send our host name to who ever requested it.
165 ** rconn - the reply packet to be formatted.
168 ** 1 on success, 0 on failure.
174 SendServerID(RMPCONN *rconn)
176 struct rmp_packet *rpl;
180 rpl = &rconn->rmp; /* cache ptr to RMP packet */
183 * Set up assorted fields in reply packet.
185 rpl->r_brpl.rmp_type = RMP_BOOT_REPL;
186 rpl->r_brpl.rmp_retcode = RMP_E_OKAY;
187 ZEROWORD(rpl->r_brpl.rmp_seqno);
188 rpl->r_brpl.rmp_session = 0;
189 rpl->r_brpl.rmp_version = htons(RMP_VERSION);
191 size = &rpl->r_brpl.rmp_flnmsize; /* ptr to length of host name */
194 * Copy our host name into the reply packet incrementing the
195 * length as we go. Stop at RMP_HOSTLEN or the first dot.
198 dst = (char *) &rpl->r_brpl.rmp_flnm;
199 for (*size = 0; *size < RMP_HOSTLEN; (*size)++) {
200 if (*src == '.' || *src == '\0')
205 rconn->rmplen = RMPBOOTSIZE(*size); /* set packet length */
207 return(SendPacket(rconn)); /* send packet */
211 ** SendFileNo -- send the name of a bootable file to the requester.
214 ** req - RMP BOOT packet containing the request.
215 ** rconn - the reply packet to be formatted.
216 ** filelist - list of files available to the requester.
219 ** 1 on success, 0 on failure.
225 SendFileNo(struct rmp_packet *req, RMPCONN *rconn, char *filelist[])
227 struct rmp_packet *rpl;
232 GETWORD(req->r_brpl.rmp_seqno, i); /* SeqNo is really FileNo */
233 rpl = &rconn->rmp; /* cache ptr to RMP packet */
236 * Set up assorted fields in reply packet.
238 rpl->r_brpl.rmp_type = RMP_BOOT_REPL;
239 PUTWORD(i, rpl->r_brpl.rmp_seqno);
241 rpl->r_brpl.rmp_session = 0;
242 rpl->r_brpl.rmp_version = htons(RMP_VERSION);
244 size = &rpl->r_brpl.rmp_flnmsize; /* ptr to length of filename */
245 *size = 0; /* init length to zero */
248 * Copy the file name into the reply packet incrementing the
249 * length as we go. Stop at end of string or when RMPBOOTDATA
250 * characters have been copied. Also, set return code to
251 * indicate success or "no more files".
253 if (i < C_MAXFILE && filelist[i] != NULL) {
255 dst = (char *)&rpl->r_brpl.rmp_flnm;
256 for (; *src && *size < RMPBOOTDATA; (*size)++) {
261 rpl->r_brpl.rmp_retcode = RMP_E_OKAY;
263 rpl->r_brpl.rmp_retcode = RMP_E_NODFLT;
265 rconn->rmplen = RMPBOOTSIZE(*size); /* set packet length */
267 return(SendPacket(rconn)); /* send packet */
271 ** SendBootRepl -- open boot file and respond to boot request.
274 ** req - RMP BOOT packet containing the request.
275 ** rconn - the reply packet to be formatted.
276 ** filelist - list of files available to the requester.
279 ** 1 on success, 0 on failure.
285 SendBootRepl(struct rmp_packet *req, RMPCONN *rconn, char *filelist[])
288 char *filename, filepath[RMPBOOTDATA+1];
290 struct rmp_packet *rpl;
291 char *src, *dst1, *dst2;
295 * If another connection already exists, delete it since we
296 * are obviously starting again.
298 if ((oldconn = FindConn(rconn)) != NULL) {
299 syslog(LOG_WARNING, "%s: dropping existing connection",
304 rpl = &rconn->rmp; /* cache ptr to RMP packet */
307 * Set up assorted fields in reply packet.
309 rpl->r_brpl.rmp_type = RMP_BOOT_REPL;
310 COPYWORD(req->r_brq.rmp_seqno, rpl->r_brpl.rmp_seqno);
311 rpl->r_brpl.rmp_session = htons(GenSessID());
312 rpl->r_brpl.rmp_version = htons(RMP_VERSION);
313 rpl->r_brpl.rmp_flnmsize = req->r_brq.rmp_flnmsize;
316 * Copy file name to `filepath' string, and into reply packet.
318 src = &req->r_brq.rmp_flnm;
320 dst2 = &rpl->r_brpl.rmp_flnm;
321 for (i = 0; i < req->r_brq.rmp_flnmsize; i++)
322 *dst1++ = *dst2++ = *src++;
326 * If we are booting HP-UX machines, their secondary loader will
327 * ask for files like "/hp-ux". As a security measure, we do not
328 * allow boot files to lay outside the boot directory (unless they
329 * are purposely link'd out. So, make `filename' become the path-
330 * stripped file name and spoof the client into thinking that it
331 * really got what it wanted.
333 filename = (filename = strrchr(filepath,'/'))? ++filename: filepath;
336 * Check that this is a valid boot file name.
338 for (i = 0; i < C_MAXFILE && filelist[i] != NULL; i++)
339 if (STREQN(filename, filelist[i]))
343 * Invalid boot file name, set error and send reply packet.
345 rpl->r_brpl.rmp_retcode = RMP_E_NOFILE;
351 * This is a valid boot file. Open the file and save the file
352 * descriptor associated with this connection and set success
353 * indication. If the file couldnt be opened, set error:
354 * "no such file or dir" - RMP_E_NOFILE
355 * "file table overflow" - RMP_E_BUSY
356 * "too many open files" - RMP_E_BUSY
357 * anything else - RMP_E_OPENFILE
359 if ((rconn->bootfd = open(filename, O_RDONLY, 0600)) < 0) {
360 rpl->r_brpl.rmp_retcode = (errno == ENOENT)? RMP_E_NOFILE:
361 (errno == EMFILE || errno == ENFILE)? RMP_E_BUSY:
365 rpl->r_brpl.rmp_retcode = RMP_E_OKAY;
370 syslog(LOG_INFO, "%s: request to boot %s (%s)",
371 EnetStr(rconn), filename, retval? "granted": "denied");
373 rconn->rmplen = RMPBOOTSIZE(rpl->r_brpl.rmp_flnmsize);
375 return (retval & SendPacket(rconn));
379 ** SendReadRepl -- send a portion of the boot file to the requester.
382 ** rconn - the reply packet to be formatted.
385 ** 1 on success, 0 on failure.
391 SendReadRepl(RMPCONN *rconn)
395 struct rmp_packet *rpl, *req;
400 * Find the old connection. If one doesn't exist, create one only
401 * to return the error code.
403 if ((oldconn = FindConn(rconn)) == NULL) {
404 if ((oldconn = NewConn(rconn)) == NULL)
406 syslog(LOG_ERR, "SendReadRepl: no active connection (%s)",
411 req = &rconn->rmp; /* cache ptr to request packet */
412 rpl = &oldconn->rmp; /* cache ptr to reply packet */
414 if (madeconn) { /* no active connection above; abort */
415 rpl->r_rrpl.rmp_retcode = RMP_E_ABORT;
421 * Make sure Session ID's match.
423 if (ntohs(req->r_rrq.rmp_session) !=
424 ((rpl->r_type == RMP_BOOT_REPL)? ntohs(rpl->r_brpl.rmp_session):
425 ntohs(rpl->r_rrpl.rmp_session))) {
426 syslog(LOG_ERR, "SendReadRepl: bad session id (%s)",
428 rpl->r_rrpl.rmp_retcode = RMP_E_BADSID;
434 * If the requester asks for more data than we can fit,
435 * silently clamp the request size down to RMPREADDATA.
437 * N.B. I do not know if this is "legal", however it seems
438 * to work. This is necessary for bpfwrite() on machines
439 * with MCLBYTES less than 1514.
441 if (ntohs(req->r_rrq.rmp_size) > RMPREADDATA)
442 req->r_rrq.rmp_size = htons(RMPREADDATA);
445 * Position read head on file according to info in request packet.
447 GETWORD(req->r_rrq.rmp_offset, size);
448 if (lseek(oldconn->bootfd, (off_t)size, SEEK_SET) < 0) {
449 syslog(LOG_ERR, "SendReadRepl: lseek: %m (%s)",
451 rpl->r_rrpl.rmp_retcode = RMP_E_ABORT;
457 * Read data directly into reply packet.
459 if ((size = read(oldconn->bootfd, &rpl->r_rrpl.rmp_data,
460 (int) ntohs(req->r_rrq.rmp_size))) <= 0) {
462 syslog(LOG_ERR, "SendReadRepl: read: %m (%s)",
464 rpl->r_rrpl.rmp_retcode = RMP_E_ABORT;
466 rpl->r_rrpl.rmp_retcode = RMP_E_EOF;
473 * Set success indication.
475 rpl->r_rrpl.rmp_retcode = RMP_E_OKAY;
479 * Set up assorted fields in reply packet.
481 rpl->r_rrpl.rmp_type = RMP_READ_REPL;
482 COPYWORD(req->r_rrq.rmp_offset, rpl->r_rrpl.rmp_offset);
483 rpl->r_rrpl.rmp_session = req->r_rrq.rmp_session;
485 oldconn->rmplen = RMPREADSIZE(size); /* set size of packet */
487 retval &= SendPacket(oldconn); /* send packet */
489 if (madeconn) /* clean up after ourself */
496 ** BootDone -- free up memory allocated for a connection.
499 ** rconn - incoming boot complete packet.
502 ** 1 on success, 0 on failure.
508 BootDone(RMPCONN *rconn)
511 struct rmp_packet *rpl;
514 * If we can't find the connection, ignore the request.
516 if ((oldconn = FindConn(rconn)) == NULL) {
517 syslog(LOG_ERR, "BootDone: no existing connection (%s)",
522 rpl = &oldconn->rmp; /* cache ptr to RMP packet */
525 * Make sure Session ID's match.
527 if (ntohs(rconn->rmp.r_rrq.rmp_session) !=
528 ((rpl->r_type == RMP_BOOT_REPL)? ntohs(rpl->r_brpl.rmp_session):
529 ntohs(rpl->r_rrpl.rmp_session))) {
530 syslog(LOG_ERR, "BootDone: bad session id (%s)",
535 RemoveConn(oldconn); /* remove connection */
537 syslog(LOG_INFO, "%s: boot complete", EnetStr(rconn));
543 ** SendPacket -- send an RMP packet to a remote host.
546 ** rconn - packet to be sent.
549 ** 1 on success, 0 on failure.
555 SendPacket(RMPCONN *rconn)
558 * Set Ethernet Destination address to Source (BPF and the enet
559 * driver will take care of getting our source address set).
561 memmove((char *)&rconn->rmp.hp_hdr.daddr[0],
562 (char *)&rconn->rmp.hp_hdr.saddr[0], RMP_ADDRLEN);
563 rconn->rmp.hp_hdr.len = htons(rconn->rmplen - sizeof(struct hp_hdr));
566 * Reverse 802.2/HP Extended Source & Destination Access Pts.
568 rconn->rmp.hp_llc.dxsap = htons(HPEXT_SXSAP);
569 rconn->rmp.hp_llc.sxsap = htons(HPEXT_DXSAP);
572 * Last time this connection was active.
574 (void)gettimeofday(&rconn->tstamp, NULL);
576 if (DbgFp != NULL) /* display packet */
577 DispPkt(rconn,DIR_SENT);
580 * Send RMP packet to remote host.
582 return(BpfWrite(rconn));