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1 office 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 #define NETDISSECT_REWORKED
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26  
27 #include <tcpdump-stdinc.h>
28  
29 #include "interface.h"
30 #include "addrtoname.h"
31 #include "extract.h"
32  
33 static const char tstr[] = "[|wb]";
34  
35 /* XXX need to add byte-swapping macros! */
36 /* XXX - you mean like the ones in "extract.h"? */
37  
38 /*
39 * Largest packet size. Everything should fit within this space.
40 * For instance, multiline objects are sent piecewise.
41 */
42 #define MAXFRAMESIZE 1024
43  
44 /*
45 * Multiple drawing ops can be sent in one packet. Each one starts on a
46 * an even multiple of DOP_ALIGN bytes, which must be a power of two.
47 */
48 #define DOP_ALIGN 4
49 #define DOP_ROUNDUP(x) ((((int)(x)) + (DOP_ALIGN - 1)) & ~(DOP_ALIGN - 1))
50 #define DOP_NEXT(d)\
51 ((struct dophdr *)((u_char *)(d) + \
52 DOP_ROUNDUP(EXTRACT_16BITS(&(d)->dh_len) + sizeof(*(d)))))
53  
54 /*
55 * Format of the whiteboard packet header.
56 * The transport level header.
57 */
58 struct pkt_hdr {
59 uint32_t ph_src; /* site id of source */
60 uint32_t ph_ts; /* time stamp (for skew computation) */
61 uint16_t ph_version; /* version number */
62 u_char ph_type; /* message type */
63 u_char ph_flags; /* message flags */
64 };
65  
66 /* Packet types */
67 #define PT_DRAWOP 0 /* drawing operation */
68 #define PT_ID 1 /* announcement packet */
69 #define PT_RREQ 2 /* repair request */
70 #define PT_RREP 3 /* repair reply */
71 #define PT_KILL 4 /* terminate participation */
72 #define PT_PREQ 5 /* page vector request */
73 #define PT_PREP 7 /* page vector reply */
74  
75 #ifdef PF_USER
76 #undef PF_USER /* {Digital,Tru64} UNIX define this, alas */
77 #endif
78  
79 /* flags */
80 #define PF_USER 0x01 /* hint that packet has interactive data */
81 #define PF_VIS 0x02 /* only visible ops wanted */
82  
83 struct PageID {
84 uint32_t p_sid; /* session id of initiator */
85 uint32_t p_uid; /* page number */
86 };
87  
88 struct dophdr {
89 uint32_t dh_ts; /* sender's timestamp */
90 uint16_t dh_len; /* body length */
91 u_char dh_flags;
92 u_char dh_type; /* body type */
93 /* body follows */
94 };
95 /*
96 * Drawing op sub-types.
97 */
98 #define DT_RECT 2
99 #define DT_LINE 3
100 #define DT_ML 4
101 #define DT_DEL 5
102 #define DT_XFORM 6
103 #define DT_ELL 7
104 #define DT_CHAR 8
105 #define DT_STR 9
106 #define DT_NOP 10
107 #define DT_PSCODE 11
108 #define DT_PSCOMP 12
109 #define DT_REF 13
110 #define DT_SKIP 14
111 #define DT_HOLE 15
112 #define DT_MAXTYPE 15
113  
114 /*
115 * A drawing operation.
116 */
117 struct pkt_dop {
118 struct PageID pd_page; /* page that operations apply to */
119 uint32_t pd_sseq; /* start sequence number */
120 uint32_t pd_eseq; /* end sequence number */
121 /* drawing ops follow */
122 };
123  
124 /*
125 * A repair request.
126 */
127 struct pkt_rreq {
128 uint32_t pr_id; /* source id of drawops to be repaired */
129 struct PageID pr_page; /* page of drawops */
130 uint32_t pr_sseq; /* start seqno */
131 uint32_t pr_eseq; /* end seqno */
132 };
133  
134 /*
135 * A repair reply.
136 */
137 struct pkt_rrep {
138 uint32_t pr_id; /* original site id of ops */
139 struct pkt_dop pr_dop;
140 /* drawing ops follow */
141 };
142  
143 struct id_off {
144 uint32_t id;
145 uint32_t off;
146 };
147  
148 struct pgstate {
149 uint32_t slot;
150 struct PageID page;
151 uint16_t nid;
152 uint16_t rsvd;
153 /* seqptr's */
154 };
155  
156 /*
157 * An announcement packet.
158 */
159 struct pkt_id {
160 uint32_t pi_mslot;
161 struct PageID pi_mpage; /* current page */
162 struct pgstate pi_ps;
163 /* seqptr's */
164 /* null-terminated site name */
165 };
166  
167 struct pkt_preq {
168 struct PageID pp_page;
169 uint32_t pp_low;
170 uint32_t pp_high;
171 };
172  
173 struct pkt_prep {
174 uint32_t pp_n; /* size of pageid array */
175 /* pgstate's follow */
176 };
177  
178 static int
179 wb_id(netdissect_options *ndo,
180 const struct pkt_id *id, u_int len)
181 {
182 int i;
183 const char *cp;
184 const struct id_off *io;
185 char c;
186 int nid;
187  
188 ND_PRINT((ndo, " wb-id:"));
189 if (len < sizeof(*id) || !ND_TTEST(*id))
190 return (-1);
191 len -= sizeof(*id);
192  
193 ND_PRINT((ndo, " %u/%s:%u (max %u/%s:%u) ",
194 EXTRACT_32BITS(&id->pi_ps.slot),
195 ipaddr_string(ndo, &id->pi_ps.page.p_sid),
196 EXTRACT_32BITS(&id->pi_ps.page.p_uid),
197 EXTRACT_32BITS(&id->pi_mslot),
198 ipaddr_string(ndo, &id->pi_mpage.p_sid),
199 EXTRACT_32BITS(&id->pi_mpage.p_uid)));
200  
201 nid = EXTRACT_16BITS(&id->pi_ps.nid);
202 len -= sizeof(*io) * nid;
203 io = (struct id_off *)(id + 1);
204 cp = (char *)(io + nid);
205 if (ND_TTEST2(cp, len)) {
206 ND_PRINT((ndo, "\""));
207 fn_print(ndo, (u_char *)cp, (u_char *)cp + len);
208 ND_PRINT((ndo, "\""));
209 }
210  
211 c = '<';
212 for (i = 0; i < nid && ND_TTEST(*io); ++io, ++i) {
213 ND_PRINT((ndo, "%c%s:%u",
214 c, ipaddr_string(ndo, &io->id), EXTRACT_32BITS(&io->off)));
215 c = ',';
216 }
217 if (i >= nid) {
218 ND_PRINT((ndo, ">"));
219 return (0);
220 }
221 return (-1);
222 }
223  
224 static int
225 wb_rreq(netdissect_options *ndo,
226 const struct pkt_rreq *rreq, u_int len)
227 {
228 ND_PRINT((ndo, " wb-rreq:"));
229 if (len < sizeof(*rreq) || !ND_TTEST(*rreq))
230 return (-1);
231  
232 ND_PRINT((ndo, " please repair %s %s:%u<%u:%u>",
233 ipaddr_string(ndo, &rreq->pr_id),
234 ipaddr_string(ndo, &rreq->pr_page.p_sid),
235 EXTRACT_32BITS(&rreq->pr_page.p_uid),
236 EXTRACT_32BITS(&rreq->pr_sseq),
237 EXTRACT_32BITS(&rreq->pr_eseq)));
238 return (0);
239 }
240  
241 static int
242 wb_preq(netdissect_options *ndo,
243 const struct pkt_preq *preq, u_int len)
244 {
245 ND_PRINT((ndo, " wb-preq:"));
246 if (len < sizeof(*preq) || !ND_TTEST(*preq))
247 return (-1);
248  
249 ND_PRINT((ndo, " need %u/%s:%u",
250 EXTRACT_32BITS(&preq->pp_low),
251 ipaddr_string(ndo, &preq->pp_page.p_sid),
252 EXTRACT_32BITS(&preq->pp_page.p_uid)));
253 return (0);
254 }
255  
256 static int
257 wb_prep(netdissect_options *ndo,
258 const struct pkt_prep *prep, u_int len)
259 {
260 int n;
261 const struct pgstate *ps;
262 const u_char *ep = ndo->ndo_snapend;
263  
264 ND_PRINT((ndo, " wb-prep:"));
265 if (len < sizeof(*prep)) {
266 return (-1);
267 }
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 = (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 = (struct pgstate *)io;
286 }
287 return ((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
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
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
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
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, (struct pkt_id *)(ph + 1), len) >= 0)
420 return;
421 break;
422  
423 case PT_RREQ:
424 if (wb_rreq(ndo, (struct pkt_rreq *)(ph + 1), len) >= 0)
425 return;
426 break;
427  
428 case PT_RREP:
429 if (wb_rrep(ndo, (struct pkt_rrep *)(ph + 1), len) >= 0)
430 return;
431 break;
432  
433 case PT_DRAWOP:
434 if (wb_drawop(ndo, (struct pkt_dop *)(ph + 1), len) >= 0)
435 return;
436 break;
437  
438 case PT_PREQ:
439 if (wb_preq(ndo, (struct pkt_preq *)(ph + 1), len) >= 0)
440 return;
441 break;
442  
443 case PT_PREP:
444 if (wb_prep(ndo, (struct pkt_prep *)(ph + 1), len) >= 0)
445 return;
446 break;
447  
448 default:
449 ND_PRINT((ndo, " wb-%d!", ph->ph_type));
450 return;
451 }
452 }