print-wb.c revision 1.9
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 1.9 2019/10/01 16:06:16 christos Exp $"); 25 #endif 26 27 /* \summary: White Board printer */ 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <netdissect-stdinc.h> 34 35 #include "netdissect.h" 36 #include "addrtoname.h" 37 #include "extract.h" 38 39 static const char tstr[] = "[|wb]"; 40 41 /* XXX need to add byte-swapping macros! */ 42 /* XXX - you mean like the ones in "extract.h"? */ 43 44 /* 45 * Largest packet size. Everything should fit within this space. 46 * For instance, multiline objects are sent piecewise. 47 */ 48 #define MAXFRAMESIZE 1024 49 50 /* 51 * Multiple drawing ops can be sent in one packet. Each one starts on a 52 * an even multiple of DOP_ALIGN bytes, which must be a power of two. 53 */ 54 #define DOP_ALIGN 4 55 #define DOP_ROUNDUP(x) ((((int)(x)) + (DOP_ALIGN - 1)) & ~(DOP_ALIGN - 1)) 56 #define DOP_NEXT(d)\ 57 ((const struct dophdr *)((const u_char *)(d) + \ 58 DOP_ROUNDUP(EXTRACT_16BITS(&(d)->dh_len) + sizeof(*(d))))) 59 60 /* 61 * Format of the whiteboard packet header. 62 * The transport level header. 63 */ 64 struct pkt_hdr { 65 uint32_t ph_src; /* site id of source */ 66 uint32_t ph_ts; /* time stamp (for skew computation) */ 67 uint16_t ph_version; /* version number */ 68 u_char ph_type; /* message type */ 69 u_char ph_flags; /* message flags */ 70 }; 71 72 /* Packet types */ 73 #define PT_DRAWOP 0 /* drawing operation */ 74 #define PT_ID 1 /* announcement packet */ 75 #define PT_RREQ 2 /* repair request */ 76 #define PT_RREP 3 /* repair reply */ 77 #define PT_KILL 4 /* terminate participation */ 78 #define PT_PREQ 5 /* page vector request */ 79 #define PT_PREP 7 /* page vector reply */ 80 81 #ifdef PF_USER 82 #undef PF_USER /* {Digital,Tru64} UNIX define this, alas */ 83 #endif 84 85 /* flags */ 86 #define PF_USER 0x01 /* hint that packet has interactive data */ 87 #define PF_VIS 0x02 /* only visible ops wanted */ 88 89 struct PageID { 90 uint32_t p_sid; /* session id of initiator */ 91 uint32_t p_uid; /* page number */ 92 }; 93 94 struct dophdr { 95 uint32_t dh_ts; /* sender's timestamp */ 96 uint16_t dh_len; /* body length */ 97 u_char dh_flags; 98 u_char dh_type; /* body type */ 99 /* body follows */ 100 }; 101 /* 102 * Drawing op sub-types. 103 */ 104 #define DT_RECT 2 105 #define DT_LINE 3 106 #define DT_ML 4 107 #define DT_DEL 5 108 #define DT_XFORM 6 109 #define DT_ELL 7 110 #define DT_CHAR 8 111 #define DT_STR 9 112 #define DT_NOP 10 113 #define DT_PSCODE 11 114 #define DT_PSCOMP 12 115 #define DT_REF 13 116 #define DT_SKIP 14 117 #define DT_HOLE 15 118 #define DT_MAXTYPE 15 119 120 /* 121 * A drawing operation. 122 */ 123 struct pkt_dop { 124 struct PageID pd_page; /* page that operations apply to */ 125 uint32_t pd_sseq; /* start sequence number */ 126 uint32_t pd_eseq; /* end sequence number */ 127 /* drawing ops follow */ 128 }; 129 130 /* 131 * A repair request. 132 */ 133 struct pkt_rreq { 134 uint32_t pr_id; /* source id of drawops to be repaired */ 135 struct PageID pr_page; /* page of drawops */ 136 uint32_t pr_sseq; /* start seqno */ 137 uint32_t pr_eseq; /* end seqno */ 138 }; 139 140 /* 141 * A repair reply. 142 */ 143 struct pkt_rrep { 144 uint32_t pr_id; /* original site id of ops */ 145 struct pkt_dop pr_dop; 146 /* drawing ops follow */ 147 }; 148 149 struct id_off { 150 uint32_t id; 151 uint32_t off; 152 }; 153 154 struct pgstate { 155 uint32_t slot; 156 struct PageID page; 157 uint16_t nid; 158 uint16_t rsvd; 159 /* seqptr's */ 160 }; 161 162 /* 163 * An announcement packet. 164 */ 165 struct pkt_id { 166 uint32_t pi_mslot; 167 struct PageID pi_mpage; /* current page */ 168 struct pgstate pi_ps; 169 /* seqptr's */ 170 /* null-terminated site name */ 171 }; 172 173 struct pkt_preq { 174 struct PageID pp_page; 175 uint32_t pp_low; 176 uint32_t pp_high; 177 }; 178 179 struct pkt_prep { 180 uint32_t pp_n; /* size of pageid array */ 181 /* pgstate's follow */ 182 }; 183 184 static int 185 wb_id(netdissect_options *ndo, 186 const struct pkt_id *id, u_int len) 187 { 188 int i; 189 const char *cp; 190 const struct id_off *io; 191 char c; 192 int nid; 193 194 ND_PRINT((ndo, " wb-id:")); 195 if (len < sizeof(*id) || !ND_TTEST(*id)) 196 return (-1); 197 len -= sizeof(*id); 198 199 ND_PRINT((ndo, " %u/%s:%u (max %u/%s:%u) ", 200 EXTRACT_32BITS(&id->pi_ps.slot), 201 ipaddr_string(ndo, &id->pi_ps.page.p_sid), 202 EXTRACT_32BITS(&id->pi_ps.page.p_uid), 203 EXTRACT_32BITS(&id->pi_mslot), 204 ipaddr_string(ndo, &id->pi_mpage.p_sid), 205 EXTRACT_32BITS(&id->pi_mpage.p_uid))); 206 207 nid = EXTRACT_16BITS(&id->pi_ps.nid); 208 len -= sizeof(*io) * nid; 209 io = (const struct id_off *)(id + 1); 210 cp = (const char *)(io + nid); 211 if (ND_TTEST2(*cp, len)) { 212 ND_PRINT((ndo, "\"")); 213 fn_print(ndo, (const u_char *)cp, (const u_char *)cp + len); 214 ND_PRINT((ndo, "\"")); 215 } 216 217 c = '<'; 218 for (i = 0; i < nid && ND_TTEST(*io); ++io, ++i) { 219 ND_PRINT((ndo, "%c%s:%u", 220 c, ipaddr_string(ndo, &io->id), EXTRACT_32BITS(&io->off))); 221 c = ','; 222 } 223 if (i >= nid) { 224 ND_PRINT((ndo, ">")); 225 return (0); 226 } 227 return (-1); 228 } 229 230 static int 231 wb_rreq(netdissect_options *ndo, 232 const struct pkt_rreq *rreq, u_int len) 233 { 234 ND_PRINT((ndo, " wb-rreq:")); 235 if (len < sizeof(*rreq) || !ND_TTEST(*rreq)) 236 return (-1); 237 238 ND_PRINT((ndo, " please repair %s %s:%u<%u:%u>", 239 ipaddr_string(ndo, &rreq->pr_id), 240 ipaddr_string(ndo, &rreq->pr_page.p_sid), 241 EXTRACT_32BITS(&rreq->pr_page.p_uid), 242 EXTRACT_32BITS(&rreq->pr_sseq), 243 EXTRACT_32BITS(&rreq->pr_eseq))); 244 return (0); 245 } 246 247 static int 248 wb_preq(netdissect_options *ndo, 249 const struct pkt_preq *preq, u_int len) 250 { 251 ND_PRINT((ndo, " wb-preq:")); 252 if (len < sizeof(*preq) || !ND_TTEST(*preq)) 253 return (-1); 254 255 ND_PRINT((ndo, " need %u/%s:%u", 256 EXTRACT_32BITS(&preq->pp_low), 257 ipaddr_string(ndo, &preq->pp_page.p_sid), 258 EXTRACT_32BITS(&preq->pp_page.p_uid))); 259 return (0); 260 } 261 262 static int 263 wb_prep(netdissect_options *ndo, 264 const struct pkt_prep *prep, u_int len) 265 { 266 int n; 267 const struct pgstate *ps; 268 const u_char *ep = ndo->ndo_snapend; 269 270 ND_PRINT((ndo, " wb-prep:")); 271 if (len < sizeof(*prep) || !ND_TTEST(*prep)) 272 return (-1); 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 = (const 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 = (const struct pgstate *)io; 291 } 292 return ((const 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, (const struct pkt_id *)(ph + 1), len) >= 0) 425 return; 426 ND_PRINT((ndo, "%s", tstr)); 427 break; 428 429 case PT_RREQ: 430 if (wb_rreq(ndo, (const struct pkt_rreq *)(ph + 1), len) >= 0) 431 return; 432 ND_PRINT((ndo, "%s", tstr)); 433 break; 434 435 case PT_RREP: 436 if (wb_rrep(ndo, (const struct pkt_rrep *)(ph + 1), len) >= 0) 437 return; 438 ND_PRINT((ndo, "%s", tstr)); 439 break; 440 441 case PT_DRAWOP: 442 if (wb_drawop(ndo, (const struct pkt_dop *)(ph + 1), len) >= 0) 443 return; 444 ND_PRINT((ndo, "%s", tstr)); 445 break; 446 447 case PT_PREQ: 448 if (wb_preq(ndo, (const struct pkt_preq *)(ph + 1), len) >= 0) 449 return; 450 ND_PRINT((ndo, "%s", tstr)); 451 break; 452 453 case PT_PREP: 454 if (wb_prep(ndo, (const struct pkt_prep *)(ph + 1), len) >= 0) 455 return; 456 ND_PRINT((ndo, "%s", tstr)); 457 break; 458 459 default: 460 ND_PRINT((ndo, " wb-%d!", ph->ph_type)); 461 return; 462 } 463 } 464
Indexes created Fri Aug 14 00:25:39 UTC 2026