• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /*
2  * Copyright (c) 1993, 1994, 1995, 1996
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that: (1) source code distributions
7  * retain the above copyright notice and this paragraph in its entirety, (2)
8  * distributions including binary code include the above copyright notice and
9  * this paragraph in its entirety in the documentation or other materials
10  * provided with the distribution, and (3) all advertising materials mentioning
11  * features or use of this software display the following acknowledgement:
12  * ``This product includes software developed by the University of California,
13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14  * the University nor the names of its contributors may be used to endorse
15  * or promote products derived from this software without specific prior
16  * written permission.
17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20  */
21 
22 /* \summary: White Board printer */
23 
24 #ifdef HAVE_CONFIG_H
25 #include "config.h"
26 #endif
27 
28 #include <netdissect-stdinc.h>
29 
30 #include "netdissect.h"
31 #include "addrtoname.h"
32 #include "extract.h"
33 
34 static const char tstr[] = "[|wb]";
35 
36 /* XXX need to add byte-swapping macros! */
37 /* XXX - you mean like the ones in "extract.h"? */
38 
39 /*
40  * Largest packet size.  Everything should fit within this space.
41  * For instance, multiline objects are sent piecewise.
42  */
43 #define MAXFRAMESIZE 1024
44 
45 /*
46  * Multiple drawing ops can be sent in one packet.  Each one starts on a
47  * an even multiple of DOP_ALIGN bytes, which must be a power of two.
48  */
49 #define DOP_ALIGN 4
50 #define DOP_ROUNDUP(x)	((((int)(x)) + (DOP_ALIGN - 1)) & ~(DOP_ALIGN - 1))
51 #define DOP_NEXT(d)\
52 	((const struct dophdr *)((const u_char *)(d) + \
53 				DOP_ROUNDUP(EXTRACT_16BITS(&(d)->dh_len) + sizeof(*(d)))))
54 
55 /*
56  * Format of the whiteboard packet header.
57  * The transport level header.
58  */
59 struct pkt_hdr {
60 	uint32_t ph_src;		/* site id of source */
61 	uint32_t ph_ts;		/* time stamp (for skew computation) */
62 	uint16_t ph_version;	/* version number */
63 	u_char ph_type;		/* message type */
64 	u_char ph_flags;	/* message flags */
65 };
66 
67 /* Packet types */
68 #define PT_DRAWOP	0	/* drawing operation */
69 #define PT_ID		1	/* announcement packet */
70 #define PT_RREQ		2	/* repair request */
71 #define PT_RREP		3	/* repair reply */
72 #define PT_KILL		4	/* terminate participation */
73 #define PT_PREQ         5       /* page vector request */
74 #define PT_PREP         7       /* page vector reply */
75 
76 #ifdef PF_USER
77 #undef PF_USER			/* {Digital,Tru64} UNIX define this, alas */
78 #endif
79 
80 /* flags */
81 #define PF_USER		0x01	/* hint that packet has interactive data */
82 #define PF_VIS		0x02	/* only visible ops wanted */
83 
84 struct PageID {
85 	uint32_t p_sid;		/* session id of initiator */
86 	uint32_t p_uid;		/* page number */
87 };
88 
89 struct dophdr {
90 	uint32_t  dh_ts;		/* sender's timestamp */
91 	uint16_t	dh_len;		/* body length */
92 	u_char	dh_flags;
93 	u_char	dh_type;	/* body type */
94 	/* body follows */
95 };
96 /*
97  * Drawing op sub-types.
98  */
99 #define DT_RECT         2
100 #define DT_LINE         3
101 #define DT_ML           4
102 #define DT_DEL          5
103 #define DT_XFORM        6
104 #define DT_ELL          7
105 #define DT_CHAR         8
106 #define DT_STR          9
107 #define DT_NOP          10
108 #define DT_PSCODE       11
109 #define DT_PSCOMP       12
110 #define DT_REF          13
111 #define DT_SKIP         14
112 #define DT_HOLE         15
113 #define DT_MAXTYPE      15
114 
115 /*
116  * A drawing operation.
117  */
118 struct pkt_dop {
119 	struct PageID pd_page;	/* page that operations apply to */
120 	uint32_t	pd_sseq;	/* start sequence number */
121 	uint32_t	pd_eseq;	/* end sequence number */
122 	/* drawing ops follow */
123 };
124 
125 /*
126  * A repair request.
127  */
128 struct pkt_rreq {
129         uint32_t pr_id;           /* source id of drawops to be repaired */
130         struct PageID pr_page;           /* page of drawops */
131         uint32_t pr_sseq;         /* start seqno */
132         uint32_t pr_eseq;         /* end seqno */
133 };
134 
135 /*
136  * A repair reply.
137  */
138 struct pkt_rrep {
139 	uint32_t pr_id;	/* original site id of ops  */
140 	struct pkt_dop pr_dop;
141 	/* drawing ops follow */
142 };
143 
144 struct id_off {
145         uint32_t id;
146         uint32_t off;
147 };
148 
149 struct pgstate {
150 	uint32_t slot;
151 	struct PageID page;
152 	uint16_t nid;
153 	uint16_t rsvd;
154         /* seqptr's */
155 };
156 
157 /*
158  * An announcement packet.
159  */
160 struct pkt_id {
161 	uint32_t pi_mslot;
162         struct PageID    pi_mpage;        /* current page */
163 	struct pgstate pi_ps;
164         /* seqptr's */
165         /* null-terminated site name */
166 };
167 
168 struct pkt_preq {
169         struct PageID  pp_page;
170         uint32_t  pp_low;
171         uint32_t  pp_high;
172 };
173 
174 struct pkt_prep {
175         uint32_t  pp_n;           /* size of pageid array */
176         /* pgstate's follow */
177 };
178 
179 static int
wb_id(netdissect_options * ndo,const struct pkt_id * id,u_int len)180 wb_id(netdissect_options *ndo,
181       const struct pkt_id *id, u_int len)
182 {
183 	int i;
184 	const char *cp;
185 	const struct id_off *io;
186 	char c;
187 	int nid;
188 
189 	ND_PRINT((ndo, " wb-id:"));
190 	if (len < sizeof(*id) || !ND_TTEST(*id))
191 		return (-1);
192 	len -= sizeof(*id);
193 
194 	ND_PRINT((ndo, " %u/%s:%u (max %u/%s:%u) ",
195 	       EXTRACT_32BITS(&id->pi_ps.slot),
196 	       ipaddr_string(ndo, &id->pi_ps.page.p_sid),
197 	       EXTRACT_32BITS(&id->pi_ps.page.p_uid),
198 	       EXTRACT_32BITS(&id->pi_mslot),
199 	       ipaddr_string(ndo, &id->pi_mpage.p_sid),
200 	       EXTRACT_32BITS(&id->pi_mpage.p_uid)));
201 
202 	nid = EXTRACT_16BITS(&id->pi_ps.nid);
203 	len -= sizeof(*io) * nid;
204 	io = (const struct id_off *)(id + 1);
205 	cp = (const char *)(io + nid);
206 	if (ND_TTEST2(cp, len)) {
207 		ND_PRINT((ndo, "\""));
208 		fn_print(ndo, (const u_char *)cp, (const u_char *)cp + len);
209 		ND_PRINT((ndo, "\""));
210 	}
211 
212 	c = '<';
213 	for (i = 0; i < nid && ND_TTEST(*io); ++io, ++i) {
214 		ND_PRINT((ndo, "%c%s:%u",
215 		    c, ipaddr_string(ndo, &io->id), EXTRACT_32BITS(&io->off)));
216 		c = ',';
217 	}
218 	if (i >= nid) {
219 		ND_PRINT((ndo, ">"));
220 		return (0);
221 	}
222 	return (-1);
223 }
224 
225 static int
wb_rreq(netdissect_options * ndo,const struct pkt_rreq * rreq,u_int len)226 wb_rreq(netdissect_options *ndo,
227         const struct pkt_rreq *rreq, u_int len)
228 {
229 	ND_PRINT((ndo, " wb-rreq:"));
230 	if (len < sizeof(*rreq) || !ND_TTEST(*rreq))
231 		return (-1);
232 
233 	ND_PRINT((ndo, " please repair %s %s:%u<%u:%u>",
234 	       ipaddr_string(ndo, &rreq->pr_id),
235 	       ipaddr_string(ndo, &rreq->pr_page.p_sid),
236 	       EXTRACT_32BITS(&rreq->pr_page.p_uid),
237 	       EXTRACT_32BITS(&rreq->pr_sseq),
238 	       EXTRACT_32BITS(&rreq->pr_eseq)));
239 	return (0);
240 }
241 
242 static int
wb_preq(netdissect_options * ndo,const struct pkt_preq * preq,u_int len)243 wb_preq(netdissect_options *ndo,
244         const struct pkt_preq *preq, u_int len)
245 {
246 	ND_PRINT((ndo, " wb-preq:"));
247 	if (len < sizeof(*preq) || !ND_TTEST(*preq))
248 		return (-1);
249 
250 	ND_PRINT((ndo, " need %u/%s:%u",
251 	       EXTRACT_32BITS(&preq->pp_low),
252 	       ipaddr_string(ndo, &preq->pp_page.p_sid),
253 	       EXTRACT_32BITS(&preq->pp_page.p_uid)));
254 	return (0);
255 }
256 
257 static int
wb_prep(netdissect_options * ndo,const struct pkt_prep * prep,u_int len)258 wb_prep(netdissect_options *ndo,
259         const struct pkt_prep *prep, u_int len)
260 {
261 	int n;
262 	const struct pgstate *ps;
263 	const u_char *ep = ndo->ndo_snapend;
264 
265 	ND_PRINT((ndo, " wb-prep:"));
266 	if (len < sizeof(*prep) || !ND_TTEST(*prep))
267 		return (-1);
268 	n = EXTRACT_32BITS(&prep->pp_n);
269 	ps = (const struct pgstate *)(prep + 1);
270 	while (--n >= 0 && ND_TTEST(*ps)) {
271 		const struct id_off *io, *ie;
272 		char c = '<';
273 
274 		ND_PRINT((ndo, " %u/%s:%u",
275 		    EXTRACT_32BITS(&ps->slot),
276 		    ipaddr_string(ndo, &ps->page.p_sid),
277 		    EXTRACT_32BITS(&ps->page.p_uid)));
278 		io = (const struct id_off *)(ps + 1);
279 		for (ie = io + ps->nid; io < ie && ND_TTEST(*io); ++io) {
280 			ND_PRINT((ndo, "%c%s:%u", c, ipaddr_string(ndo, &io->id),
281 			    EXTRACT_32BITS(&io->off)));
282 			c = ',';
283 		}
284 		ND_PRINT((ndo, ">"));
285 		ps = (const struct pgstate *)io;
286 	}
287 	return ((const u_char *)ps <= ep? 0 : -1);
288 }
289 
290 
291 static const char *dopstr[] = {
292 	"dop-0!",
293 	"dop-1!",
294 	"RECT",
295 	"LINE",
296 	"ML",
297 	"DEL",
298 	"XFORM",
299 	"ELL",
300 	"CHAR",
301 	"STR",
302 	"NOP",
303 	"PSCODE",
304 	"PSCOMP",
305 	"REF",
306 	"SKIP",
307 	"HOLE",
308 };
309 
310 static int
wb_dops(netdissect_options * ndo,const struct pkt_dop * dop,uint32_t ss,uint32_t es)311 wb_dops(netdissect_options *ndo, const struct pkt_dop *dop,
312         uint32_t ss, uint32_t es)
313 {
314 	const struct dophdr *dh = (const struct dophdr *)((const u_char *)dop + sizeof(*dop));
315 
316 	ND_PRINT((ndo, " <"));
317 	for ( ; ss <= es; ++ss) {
318 		int t;
319 
320 		if (!ND_TTEST(*dh)) {
321 			ND_PRINT((ndo, "%s", tstr));
322 			break;
323 		}
324 		t = dh->dh_type;
325 
326 		if (t > DT_MAXTYPE)
327 			ND_PRINT((ndo, " dop-%d!", t));
328 		else {
329 			ND_PRINT((ndo, " %s", dopstr[t]));
330 			if (t == DT_SKIP || t == DT_HOLE) {
331 				uint32_t ts = EXTRACT_32BITS(&dh->dh_ts);
332 				ND_PRINT((ndo, "%d", ts - ss + 1));
333 				if (ss > ts || ts > es) {
334 					ND_PRINT((ndo, "[|]"));
335 					if (ts < ss)
336 						return (0);
337 				}
338 				ss = ts;
339 			}
340 		}
341 		dh = DOP_NEXT(dh);
342 	}
343 	ND_PRINT((ndo, " >"));
344 	return (0);
345 }
346 
347 static int
wb_rrep(netdissect_options * ndo,const struct pkt_rrep * rrep,u_int len)348 wb_rrep(netdissect_options *ndo,
349         const struct pkt_rrep *rrep, u_int len)
350 {
351 	const struct pkt_dop *dop = &rrep->pr_dop;
352 
353 	ND_PRINT((ndo, " wb-rrep:"));
354 	if (len < sizeof(*rrep) || !ND_TTEST(*rrep))
355 		return (-1);
356 	len -= sizeof(*rrep);
357 
358 	ND_PRINT((ndo, " for %s %s:%u<%u:%u>",
359 	    ipaddr_string(ndo, &rrep->pr_id),
360 	    ipaddr_string(ndo, &dop->pd_page.p_sid),
361 	    EXTRACT_32BITS(&dop->pd_page.p_uid),
362 	    EXTRACT_32BITS(&dop->pd_sseq),
363 	    EXTRACT_32BITS(&dop->pd_eseq)));
364 
365 	if (ndo->ndo_vflag)
366 		return (wb_dops(ndo, dop,
367 		    EXTRACT_32BITS(&dop->pd_sseq),
368 		    EXTRACT_32BITS(&dop->pd_eseq)));
369 	return (0);
370 }
371 
372 static int
wb_drawop(netdissect_options * ndo,const struct pkt_dop * dop,u_int len)373 wb_drawop(netdissect_options *ndo,
374           const struct pkt_dop *dop, u_int len)
375 {
376 	ND_PRINT((ndo, " wb-dop:"));
377 	if (len < sizeof(*dop) || !ND_TTEST(*dop))
378 		return (-1);
379 	len -= sizeof(*dop);
380 
381 	ND_PRINT((ndo, " %s:%u<%u:%u>",
382 	    ipaddr_string(ndo, &dop->pd_page.p_sid),
383 	    EXTRACT_32BITS(&dop->pd_page.p_uid),
384 	    EXTRACT_32BITS(&dop->pd_sseq),
385 	    EXTRACT_32BITS(&dop->pd_eseq)));
386 
387 	if (ndo->ndo_vflag)
388 		return (wb_dops(ndo, dop,
389 				EXTRACT_32BITS(&dop->pd_sseq),
390 				EXTRACT_32BITS(&dop->pd_eseq)));
391 	return (0);
392 }
393 
394 /*
395  * Print whiteboard multicast packets.
396  */
397 void
wb_print(netdissect_options * ndo,register const void * hdr,register u_int len)398 wb_print(netdissect_options *ndo,
399          register const void *hdr, register u_int len)
400 {
401 	register const struct pkt_hdr *ph;
402 
403 	ph = (const struct pkt_hdr *)hdr;
404 	if (len < sizeof(*ph) || !ND_TTEST(*ph)) {
405 		ND_PRINT((ndo, "%s", tstr));
406 		return;
407 	}
408 	len -= sizeof(*ph);
409 
410 	if (ph->ph_flags)
411 		ND_PRINT((ndo, "*"));
412 	switch (ph->ph_type) {
413 
414 	case PT_KILL:
415 		ND_PRINT((ndo, " wb-kill"));
416 		return;
417 
418 	case PT_ID:
419 		if (wb_id(ndo, (const struct pkt_id *)(ph + 1), len) >= 0)
420 			return;
421 		ND_PRINT((ndo, "%s", tstr));
422 		break;
423 
424 	case PT_RREQ:
425 		if (wb_rreq(ndo, (const struct pkt_rreq *)(ph + 1), len) >= 0)
426 			return;
427 		ND_PRINT((ndo, "%s", tstr));
428 		break;
429 
430 	case PT_RREP:
431 		if (wb_rrep(ndo, (const struct pkt_rrep *)(ph + 1), len) >= 0)
432 			return;
433 		ND_PRINT((ndo, "%s", tstr));
434 		break;
435 
436 	case PT_DRAWOP:
437 		if (wb_drawop(ndo, (const struct pkt_dop *)(ph + 1), len) >= 0)
438 			return;
439 		ND_PRINT((ndo, "%s", tstr));
440 		break;
441 
442 	case PT_PREQ:
443 		if (wb_preq(ndo, (const struct pkt_preq *)(ph + 1), len) >= 0)
444 			return;
445 		ND_PRINT((ndo, "%s", tstr));
446 		break;
447 
448 	case PT_PREP:
449 		if (wb_prep(ndo, (const struct pkt_prep *)(ph + 1), len) >= 0)
450 			return;
451 		ND_PRINT((ndo, "%s", tstr));
452 		break;
453 
454 	default:
455 		ND_PRINT((ndo, " wb-%d!", ph->ph_type));
456 		return;
457 	}
458 }
459