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 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 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 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 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 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 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 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 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