The Tcpdump Group git mirrors - tcpdump/blob - print-wb.c

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