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 /* \summary: White Board printer */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include "netdissect-stdinc.h"
  29
  30 #include "netdissect.h"
  31 #include "addrtoname.h"
  32 #include "extract.h"
  33
  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)  roundup2(x, DOP_ALIGN)
  50 #define DOP_NEXT(d)\
  51         ((const struct dophdr *)((const u_char *)(d) + \
  52                                 DOP_ROUNDUP(GET_BE_U_2((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         nd_uint32_t ph_src;     /* site id of source */
  60         nd_uint32_t ph_ts;      /* time stamp (for skew computation) */
  61         nd_uint16_t ph_version; /* version number */
  62         nd_uint8_t ph_type;     /* message type */
  63         nd_uint8_t 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         nd_uint32_t p_sid;              /* session id of initiator */
  85         nd_uint32_t p_uid;              /* page number */
  86 };
  87
  88 struct dophdr {
  89         nd_uint32_t     dh_ts;          /* sender's timestamp */
  90         nd_uint16_t     dh_len;         /* body length */
  91         nd_uint8_t      dh_flags;
  92         nd_uint8_t      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         nd_uint32_t     pd_sseq;        /* start sequence number */
 120         nd_uint32_t     pd_eseq;        /* end sequence number */
 121         /* drawing ops follow */
 122 };
 123
 124 /*
 125  * A repair request.
 126  */
 127 struct pkt_rreq {
 128         nd_uint32_t pr_id;        /* source id of drawops to be repaired */
 129         struct PageID pr_page;    /* page of drawops */
 130         nd_uint32_t pr_sseq;      /* start seqno */
 131         nd_uint32_t pr_eseq;      /* end seqno */
 132 };
 133
 134 /*
 135  * A repair reply.
 136  */
 137 struct pkt_rrep {
 138         nd_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         nd_uint32_t id;
 145         nd_uint32_t off;
 146 };
 147
 148 struct pgstate {
 149         nd_uint32_t slot;
 150         struct PageID page;
 151         nd_uint16_t nid;
 152         nd_uint16_t rsvd;
 153         /* seqptr's */
 154 };
 155
 156 /*
 157  * An announcement packet.
 158  */
 159 struct pkt_id {
 160         nd_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         nd_uint32_t  pp_low;
 170         nd_uint32_t  pp_high;
 171 };
 172
 173 struct pkt_prep {
 174         nd_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         u_int i;
 183         const u_char *sitename;
 184         const struct id_off *io;
 185         char c;
 186         u_int nid;
 187
 188         ND_PRINT(" wb-id:");
 189         if (len < sizeof(*id) || !ND_TTEST_SIZE(id))
 190                 return (-1);
 191         len -= sizeof(*id);
 192
 193         ND_PRINT(" %u/%s:%u (max %u/%s:%u) ",
 194                GET_BE_U_4(id->pi_ps.slot),
 195                GET_IPADDR_STRING(id->pi_ps.page.p_sid),
 196                GET_BE_U_4(id->pi_ps.page.p_uid),
 197                GET_BE_U_4(id->pi_mslot),
 198                GET_IPADDR_STRING(id->pi_mpage.p_sid),
 199                GET_BE_U_4(id->pi_mpage.p_uid));
 200
 201         nid = GET_BE_U_2(id->pi_ps.nid);
 202         if (len < sizeof(*io) * nid)
 203                 return (-1);
 204         len -= sizeof(*io) * nid;
 205         io = (const struct id_off *)(id + 1);
 206         sitename = (const u_char *)(io + nid);
 207
 208         c = '<';
 209         for (i = 0; i < nid && ND_TTEST_SIZE(io); ++io, ++i) {
 210                 ND_PRINT("%c%s:%u",
 211                     c, GET_IPADDR_STRING(io->id), GET_BE_U_4(io->off));
 212                 c = ',';
 213         }
 214         if (i >= nid) {
 215                 ND_PRINT("> \"");
 216                 (void)nd_print(ndo, sitename, sitename + len);
 217                 ND_PRINT("\"");
 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(" wb-rreq:");
 228         if (len < sizeof(*rreq) || !ND_TTEST_SIZE(rreq))
 229                 return (-1);
 230
 231         ND_PRINT(" please repair %s %s:%u<%u:%u>",
 232                GET_IPADDR_STRING(rreq->pr_id),
 233                GET_IPADDR_STRING(rreq->pr_page.p_sid),
 234                GET_BE_U_4(rreq->pr_page.p_uid),
 235                GET_BE_U_4(rreq->pr_sseq),
 236                GET_BE_U_4(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(" wb-preq:");
 245         if (len < sizeof(*preq) || !ND_TTEST_SIZE(preq))
 246                 return (-1);
 247
 248         ND_PRINT(" need %u/%s:%u",
 249                GET_BE_U_4(preq->pp_low),
 250                GET_IPADDR_STRING(preq->pp_page.p_sid),
 251                GET_BE_U_4(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         u_int n;
 260         const struct pgstate *ps;
 261         const u_char *ep = ndo->ndo_snapend;
 262
 263         ND_PRINT(" wb-prep:");
 264         if (len < sizeof(*prep) || !ND_TTEST_SIZE(prep))
 265                 return (-1);
 266         n = GET_BE_U_4(prep->pp_n);
 267         ps = (const struct pgstate *)(prep + 1);
 268         while (n != 0 && ND_TTEST_SIZE(ps)) {
 269                 const struct id_off *io, *ie;
 270                 char c = '<';
 271
 272                 ND_PRINT(" %u/%s:%u",
 273                     GET_BE_U_4(ps->slot),
 274                     GET_IPADDR_STRING(ps->page.p_sid),
 275                     GET_BE_U_4(ps->page.p_uid));
 276                 io = (const struct id_off *)(ps + 1);
 277                 for (ie = io + GET_U_1(ps->nid); io < ie && ND_TTEST_SIZE(io); ++io) {
 278                         ND_PRINT("%c%s:%u", c, GET_IPADDR_STRING(io->id),
 279                             GET_BE_U_4(io->off));
 280                         c = ',';
 281                 }
 282                 ND_PRINT(">");
 283                 ps = (const struct pgstate *)io;
 284                 n--;
 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(" <");
 316         for ( ; ss <= es; ++ss) {
 317                 u_int t;
 318
 319                 if (!ND_TTEST_SIZE(dh)) {
 320                         nd_print_trunc(ndo);
 321                         break;
 322                 }
 323                 t = GET_U_1(dh->dh_type);
 324
 325                 if (t > DT_MAXTYPE)
 326                         ND_PRINT(" dop-%u!", t);
 327                 else {
 328                         ND_PRINT(" %s", dopstr[t]);
 329                         if (t == DT_SKIP || t == DT_HOLE) {
 330                                 uint32_t ts = GET_BE_U_4(dh->dh_ts);
 331                                 ND_PRINT("%u", ts - ss + 1);
 332                                 if (ss > ts || ts > es) {
 333                                         ND_PRINT("[|]");
 334                                         if (ts < ss)
 335                                                 return (0);
 336                                 }
 337                                 ss = ts;
 338                         }
 339                 }
 340                 dh = DOP_NEXT(dh);
 341         }
 342         ND_PRINT(" >");
 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(" wb-rrep:");
 353         if (len < sizeof(*rrep) || !ND_TTEST_SIZE(rrep))
 354                 return (-1);
 355         len -= sizeof(*rrep);
 356
 357         ND_PRINT(" for %s %s:%u<%u:%u>",
 358             GET_IPADDR_STRING(rrep->pr_id),
 359             GET_IPADDR_STRING(dop->pd_page.p_sid),
 360             GET_BE_U_4(dop->pd_page.p_uid),
 361             GET_BE_U_4(dop->pd_sseq),
 362             GET_BE_U_4(dop->pd_eseq));
 363
 364         if (ndo->ndo_vflag)
 365                 return (wb_dops(ndo, dop,
 366                     GET_BE_U_4(dop->pd_sseq),
 367                     GET_BE_U_4(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(" wb-dop:");
 376         if (len < sizeof(*dop) || !ND_TTEST_SIZE(dop))
 377                 return (-1);
 378         len -= sizeof(*dop);
 379
 380         ND_PRINT(" %s:%u<%u:%u>",
 381             GET_IPADDR_STRING(dop->pd_page.p_sid),
 382             GET_BE_U_4(dop->pd_page.p_uid),
 383             GET_BE_U_4(dop->pd_sseq),
 384             GET_BE_U_4(dop->pd_eseq));
 385
 386         if (ndo->ndo_vflag)
 387                 return (wb_dops(ndo, dop,
 388                                 GET_BE_U_4(dop->pd_sseq),
 389                                 GET_BE_U_4(dop->pd_eseq)));
 390         return (0);
 391 }
 392
 393 /*
 394  * Print whiteboard multicast packets.
 395  */
 396 void
 397 wb_print(netdissect_options *ndo,
 398          const u_char *hdr, u_int len)
 399 {
 400         const struct pkt_hdr *ph;
 401         uint8_t type;
 402
 403         ndo->ndo_protocol = "wb";
 404         ph = (const struct pkt_hdr *)hdr;
 405         if (len < sizeof(*ph) || !ND_TTEST_SIZE(ph)) {
 406                 nd_print_trunc(ndo);
 407                 return;
 408         }
 409         len -= sizeof(*ph);
 410
 411         if (GET_U_1(ph->ph_flags))
 412                 ND_PRINT("*");
 413         type = GET_U_1(ph->ph_type);
 414         switch (type) {
 415
 416         case PT_KILL:
 417                 ND_PRINT(" wb-kill");
 418                 return;
 419
 420         case PT_ID:
 421                 if (wb_id(ndo, (const struct pkt_id *)(ph + 1), len) >= 0)
 422                         return;
 423                 nd_print_trunc(ndo);
 424                 break;
 425
 426         case PT_RREQ:
 427                 if (wb_rreq(ndo, (const struct pkt_rreq *)(ph + 1), len) >= 0)
 428                         return;
 429                 nd_print_trunc(ndo);
 430                 break;
 431
 432         case PT_RREP:
 433                 if (wb_rrep(ndo, (const struct pkt_rrep *)(ph + 1), len) >= 0)
 434                         return;
 435                 nd_print_trunc(ndo);
 436                 break;
 437
 438         case PT_DRAWOP:
 439                 if (wb_drawop(ndo, (const struct pkt_dop *)(ph + 1), len) >= 0)
 440                         return;
 441                 nd_print_trunc(ndo);
 442                 break;
 443
 444         case PT_PREQ:
 445                 if (wb_preq(ndo, (const struct pkt_preq *)(ph + 1), len) >= 0)
 446                         return;
 447                 nd_print_trunc(ndo);
 448                 break;
 449
 450         case PT_PREP:
 451                 if (wb_prep(ndo, (const struct pkt_prep *)(ph + 1), len) >= 0)
 452                         return;
 453                 nd_print_trunc(ndo);
 454                 break;
 455
 456         default:
 457                 ND_PRINT(" wb-%u!", type);
 458                 return;
 459         }
 460 }