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 #include <sys/cdefs.h>
23 #ifndef lint
24 __RCSID("$NetBSD: print-wb.c,v 1.5 2015/03/31 21:59:35 christos Exp $");
25 #endif
26
27 #define NETDISSECT_REWORKED
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include <tcpdump-stdinc.h>
33
34 #include "interface.h"
35 #include "addrtoname.h"
36 #include "extract.h"
37
38 static const char tstr[] = "[|wb]";
39
40 /* XXX need to add byte-swapping macros! */
41 /* XXX - you mean like the ones in "extract.h"? */
42
43 /*
44 * Largest packet size. Everything should fit within this space.
45 * For instance, multiline objects are sent piecewise.
46 */
47 #define MAXFRAMESIZE 1024
48
49 /*
50 * Multiple drawing ops can be sent in one packet. Each one starts on a
51 * an even multiple of DOP_ALIGN bytes, which must be a power of two.
52 */
53 #define DOP_ALIGN 4
54 #define DOP_ROUNDUP(x) ((((int)(x)) + (DOP_ALIGN - 1)) & ~(DOP_ALIGN - 1))
55 #define DOP_NEXT(d)\
56 ((struct dophdr *)((u_char *)(d) + \
57 DOP_ROUNDUP(EXTRACT_16BITS(&(d)->dh_len) + sizeof(*(d)))))
58
59 /*
60 * Format of the whiteboard packet header.
61 * The transport level header.
62 */
63 struct pkt_hdr {
64 uint32_t ph_src; /* site id of source */
65 uint32_t ph_ts; /* time stamp (for skew computation) */
66 uint16_t ph_version; /* version number */
67 u_char ph_type; /* message type */
68 u_char ph_flags; /* message flags */
69 };
70
71 /* Packet types */
72 #define PT_DRAWOP 0 /* drawing operation */
73 #define PT_ID 1 /* announcement packet */
74 #define PT_RREQ 2 /* repair request */
75 #define PT_RREP 3 /* repair reply */
76 #define PT_KILL 4 /* terminate participation */
77 #define PT_PREQ 5 /* page vector request */
78 #define PT_PREP 7 /* page vector reply */
79
80 #ifdef PF_USER
81 #undef PF_USER /* {Digital,Tru64} UNIX define this, alas */
82 #endif
83
84 /* flags */
85 #define PF_USER 0x01 /* hint that packet has interactive data */
86 #define PF_VIS 0x02 /* only visible ops wanted */
87
88 struct PageID {
89 uint32_t p_sid; /* session id of initiator */
90 uint32_t p_uid; /* page number */
91 };
92
93 struct dophdr {
94 uint32_t dh_ts; /* sender's timestamp */
95 uint16_t dh_len; /* body length */
96 u_char dh_flags;
97 u_char dh_type; /* body type */
98 /* body follows */
99 };
100 /*
101 * Drawing op sub-types.
102 */
103 #define DT_RECT 2
104 #define DT_LINE 3
105 #define DT_ML 4
106 #define DT_DEL 5
107 #define DT_XFORM 6
108 #define DT_ELL 7
109 #define DT_CHAR 8
110 #define DT_STR 9
111 #define DT_NOP 10
112 #define DT_PSCODE 11
113 #define DT_PSCOMP 12
114 #define DT_REF 13
115 #define DT_SKIP 14
116 #define DT_HOLE 15
117 #define DT_MAXTYPE 15
118
119 /*
120 * A drawing operation.
121 */
122 struct pkt_dop {
123 struct PageID pd_page; /* page that operations apply to */
124 uint32_t pd_sseq; /* start sequence number */
125 uint32_t pd_eseq; /* end sequence number */
126 /* drawing ops follow */
127 };
128
129 /*
130 * A repair request.
131 */
132 struct pkt_rreq {
133 uint32_t pr_id; /* source id of drawops to be repaired */
134 struct PageID pr_page; /* page of drawops */
135 uint32_t pr_sseq; /* start seqno */
136 uint32_t pr_eseq; /* end seqno */
137 };
138
139 /*
140 * A repair reply.
141 */
142 struct pkt_rrep {
143 uint32_t pr_id; /* original site id of ops */
144 struct pkt_dop pr_dop;
145 /* drawing ops follow */
146 };
147
148 struct id_off {
149 uint32_t id;
150 uint32_t off;
151 };
152
153 struct pgstate {
154 uint32_t slot;
155 struct PageID page;
156 uint16_t nid;
157 uint16_t rsvd;
158 /* seqptr's */
159 };
160
161 /*
162 * An announcement packet.
163 */
164 struct pkt_id {
165 uint32_t pi_mslot;
166 struct PageID pi_mpage; /* current page */
167 struct pgstate pi_ps;
168 /* seqptr's */
169 /* null-terminated site name */
170 };
171
172 struct pkt_preq {
173 struct PageID pp_page;
174 uint32_t pp_low;
175 uint32_t pp_high;
176 };
177
178 struct pkt_prep {
179 uint32_t pp_n; /* size of pageid array */
180 /* pgstate's follow */
181 };
182
183 static int
wb_id(netdissect_options * ndo,const struct pkt_id * id,u_int len)184 wb_id(netdissect_options *ndo,
185 const struct pkt_id *id, u_int len)
186 {
187 int i;
188 const char *cp;
189 const struct id_off *io;
190 char c;
191 int nid;
192
193 ND_PRINT((ndo, " wb-id:"));
194 if (len < sizeof(*id) || !ND_TTEST(*id))
195 return (-1);
196 len -= sizeof(*id);
197
198 ND_PRINT((ndo, " %u/%s:%u (max %u/%s:%u) ",
199 EXTRACT_32BITS(&id->pi_ps.slot),
200 ipaddr_string(ndo, &id->pi_ps.page.p_sid),
201 EXTRACT_32BITS(&id->pi_ps.page.p_uid),
202 EXTRACT_32BITS(&id->pi_mslot),
203 ipaddr_string(ndo, &id->pi_mpage.p_sid),
204 EXTRACT_32BITS(&id->pi_mpage.p_uid)));
205
206 nid = EXTRACT_16BITS(&id->pi_ps.nid);
207 len -= sizeof(*io) * nid;
208 io = (struct id_off *)(id + 1);
209 cp = (char *)(io + nid);
210 if (!ND_TTEST2(cp, len)) {
211 ND_PRINT((ndo, "\""));
212 fn_print(ndo, (u_char *)cp, (u_char *)cp + len);
213 ND_PRINT((ndo, "\""));
214 }
215
216 c = '<';
217 for (i = 0; i < nid && ND_TTEST(*io); ++io, ++i) {
218 ND_PRINT((ndo, "%c%s:%u",
219 c, ipaddr_string(ndo, &io->id), EXTRACT_32BITS(&io->off)));
220 c = ',';
221 }
222 if (i >= nid) {
223 ND_PRINT((ndo, ">"));
224 return (0);
225 }
226 return (-1);
227 }
228
229 static int
wb_rreq(netdissect_options * ndo,const struct pkt_rreq * rreq,u_int len)230 wb_rreq(netdissect_options *ndo,
231 const struct pkt_rreq *rreq, u_int len)
232 {
233 ND_PRINT((ndo, " wb-rreq:"));
234 if (len < sizeof(*rreq) || !ND_TTEST(*rreq))
235 return (-1);
236
237 ND_PRINT((ndo, " please repair %s %s:%u<%u:%u>",
238 ipaddr_string(ndo, &rreq->pr_id),
239 ipaddr_string(ndo, &rreq->pr_page.p_sid),
240 EXTRACT_32BITS(&rreq->pr_page.p_uid),
241 EXTRACT_32BITS(&rreq->pr_sseq),
242 EXTRACT_32BITS(&rreq->pr_eseq)));
243 return (0);
244 }
245
246 static int
wb_preq(netdissect_options * ndo,const struct pkt_preq * preq,u_int len)247 wb_preq(netdissect_options *ndo,
248 const struct pkt_preq *preq, u_int len)
249 {
250 ND_PRINT((ndo, " wb-preq:"));
251 if (len < sizeof(*preq) || !ND_TTEST(*preq))
252 return (-1);
253
254 ND_PRINT((ndo, " need %u/%s:%u",
255 EXTRACT_32BITS(&preq->pp_low),
256 ipaddr_string(ndo, &preq->pp_page.p_sid),
257 EXTRACT_32BITS(&preq->pp_page.p_uid)));
258 return (0);
259 }
260
261 static int
wb_prep(netdissect_options * ndo,const struct pkt_prep * prep,u_int len)262 wb_prep(netdissect_options *ndo,
263 const struct pkt_prep *prep, u_int len)
264 {
265 int n;
266 const struct pgstate *ps;
267 const u_char *ep = ndo->ndo_snapend;
268
269 ND_PRINT((ndo, " wb-prep:"));
270 if (len < sizeof(*prep)) {
271 return (-1);
272 }
273 n = EXTRACT_32BITS(&prep->pp_n);
274 ps = (const struct pgstate *)(prep + 1);
275 while (--n >= 0 && !ND_TTEST(*ps)) {
276 const struct id_off *io, *ie;
277 char c = '<';
278
279 ND_PRINT((ndo, " %u/%s:%u",
280 EXTRACT_32BITS(&ps->slot),
281 ipaddr_string(ndo, &ps->page.p_sid),
282 EXTRACT_32BITS(&ps->page.p_uid)));
283 io = (struct id_off *)(ps + 1);
284 for (ie = io + ps->nid; io < ie && !ND_TTEST(*io); ++io) {
285 ND_PRINT((ndo, "%c%s:%u", c, ipaddr_string(ndo, &io->id),
286 EXTRACT_32BITS(&io->off)));
287 c = ',';
288 }
289 ND_PRINT((ndo, ">"));
290 ps = (struct pgstate *)io;
291 }
292 return ((u_char *)ps <= ep? 0 : -1);
293 }
294
295
296 static const char *dopstr[] = {
297 "dop-0!",
298 "dop-1!",
299 "RECT",
300 "LINE",
301 "ML",
302 "DEL",
303 "XFORM",
304 "ELL",
305 "CHAR",
306 "STR",
307 "NOP",
308 "PSCODE",
309 "PSCOMP",
310 "REF",
311 "SKIP",
312 "HOLE",
313 };
314
315 static int
wb_dops(netdissect_options * ndo,const struct pkt_dop * dop,uint32_t ss,uint32_t es)316 wb_dops(netdissect_options *ndo, const struct pkt_dop *dop,
317 uint32_t ss, uint32_t es)
318 {
319 const struct dophdr *dh = (const struct dophdr *)((const u_char *)dop + sizeof(*dop));
320
321 ND_PRINT((ndo, " <"));
322 for ( ; ss <= es; ++ss) {
323 int t;
324
325 if (!ND_TTEST(*dh)) {
326 ND_PRINT((ndo, "%s", tstr));
327 break;
328 }
329 t = dh->dh_type;
330
331 if (t > DT_MAXTYPE)
332 ND_PRINT((ndo, " dop-%d!", t));
333 else {
334 ND_PRINT((ndo, " %s", dopstr[t]));
335 if (t == DT_SKIP || t == DT_HOLE) {
336 uint32_t ts = EXTRACT_32BITS(&dh->dh_ts);
337 ND_PRINT((ndo, "%d", ts - ss + 1));
338 if (ss > ts || ts > es) {
339 ND_PRINT((ndo, "[|]"));
340 if (ts < ss)
341 return (0);
342 }
343 ss = ts;
344 }
345 }
346 dh = DOP_NEXT(dh);
347 }
348 ND_PRINT((ndo, " >"));
349 return (0);
350 }
351
352 static int
wb_rrep(netdissect_options * ndo,const struct pkt_rrep * rrep,u_int len)353 wb_rrep(netdissect_options *ndo,
354 const struct pkt_rrep *rrep, u_int len)
355 {
356 const struct pkt_dop *dop = &rrep->pr_dop;
357
358 ND_PRINT((ndo, " wb-rrep:"));
359 if (len < sizeof(*rrep) || !ND_TTEST(*rrep))
360 return (-1);
361 len -= sizeof(*rrep);
362
363 ND_PRINT((ndo, " for %s %s:%u<%u:%u>",
364 ipaddr_string(ndo, &rrep->pr_id),
365 ipaddr_string(ndo, &dop->pd_page.p_sid),
366 EXTRACT_32BITS(&dop->pd_page.p_uid),
367 EXTRACT_32BITS(&dop->pd_sseq),
368 EXTRACT_32BITS(&dop->pd_eseq)));
369
370 if (ndo->ndo_vflag)
371 return (wb_dops(ndo, dop,
372 EXTRACT_32BITS(&dop->pd_sseq),
373 EXTRACT_32BITS(&dop->pd_eseq)));
374 return (0);
375 }
376
377 static int
wb_drawop(netdissect_options * ndo,const struct pkt_dop * dop,u_int len)378 wb_drawop(netdissect_options *ndo,
379 const struct pkt_dop *dop, u_int len)
380 {
381 ND_PRINT((ndo, " wb-dop:"));
382 if (len < sizeof(*dop) || !ND_TTEST(*dop))
383 return (-1);
384 len -= sizeof(*dop);
385
386 ND_PRINT((ndo, " %s:%u<%u:%u>",
387 ipaddr_string(ndo, &dop->pd_page.p_sid),
388 EXTRACT_32BITS(&dop->pd_page.p_uid),
389 EXTRACT_32BITS(&dop->pd_sseq),
390 EXTRACT_32BITS(&dop->pd_eseq)));
391
392 if (ndo->ndo_vflag)
393 return (wb_dops(ndo, dop,
394 EXTRACT_32BITS(&dop->pd_sseq),
395 EXTRACT_32BITS(&dop->pd_eseq)));
396 return (0);
397 }
398
399 /*
400 * Print whiteboard multicast packets.
401 */
402 void
wb_print(netdissect_options * ndo,register const void * hdr,register u_int len)403 wb_print(netdissect_options *ndo,
404 register const void *hdr, register u_int len)
405 {
406 register const struct pkt_hdr *ph;
407
408 ph = (const struct pkt_hdr *)hdr;
409 if (len < sizeof(*ph) || !ND_TTEST(*ph)) {
410 ND_PRINT((ndo, "%s", tstr));
411 return;
412 }
413 len -= sizeof(*ph);
414
415 if (ph->ph_flags)
416 ND_PRINT((ndo, "*"));
417 switch (ph->ph_type) {
418
419 case PT_KILL:
420 ND_PRINT((ndo, " wb-kill"));
421 return;
422
423 case PT_ID:
424 if (wb_id(ndo, (struct pkt_id *)(ph + 1), len) >= 0)
425 return;
426 break;
427
428 case PT_RREQ:
429 if (wb_rreq(ndo, (struct pkt_rreq *)(ph + 1), len) >= 0)
430 return;
431 break;
432
433 case PT_RREP:
434 if (wb_rrep(ndo, (struct pkt_rrep *)(ph + 1), len) >= 0)
435 return;
436 break;
437
438 case PT_DRAWOP:
439 if (wb_drawop(ndo, (struct pkt_dop *)(ph + 1), len) >= 0)
440 return;
441 break;
442
443 case PT_PREQ:
444 if (wb_preq(ndo, (struct pkt_preq *)(ph + 1), len) >= 0)
445 return;
446 break;
447
448 case PT_PREP:
449 if (wb_prep(ndo, (struct pkt_prep *)(ph + 1), len) >= 0)
450 return;
451 break;
452
453 default:
454 ND_PRINT((ndo, " wb-%d!", ph->ph_type));
455 return;
456 }
457 }
458