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 } 453