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 #include <config.h>
  25
  26 #include "netdissect-stdinc.h"
  27
  28 #define ND_LONGJMP_FROM_TCHECK
  29 #include "netdissect.h"
  30 #include "addrtoname.h"
  31 #include "extract.h"
  32
  33
  34 #if 0
  35 /*
  36  * Largest packet size.  Everything should fit within this space.
  37  * For instance, multiline objects are sent piecewise.
  38  */
  39 #define MAXFRAMESIZE 1024
  40 #endif
  41
  42 /*
  43  * Multiple drawing ops can be sent in one packet.  Each one starts on a
  44  * an even multiple of DOP_ALIGN bytes, which must be a power of two.
  45  */
  46 #define DOP_ALIGN 4
  47 #define DOP_ROUNDUP(x)  roundup2(x, DOP_ALIGN)
  48 #define DOP_NEXT(d)\
  49         ((const struct dophdr *)((const u_char *)(d) + \
  50                                 DOP_ROUNDUP(GET_BE_U_2((d)->dh_len) + sizeof(*(d)))))
  51
  52 /*
  53  * Format of the whiteboard packet header.
  54  * The transport level header.
  55  */
  56 struct pkt_hdr {
  57         nd_uint32_t ph_src;     /* site id of source */
  58         nd_uint32_t ph_ts;      /* time stamp (for skew computation) */
  59         nd_uint16_t ph_version; /* version number */
  60         nd_uint8_t ph_type;     /* message type */
  61         nd_uint8_t ph_flags;    /* message flags */
  62 };
  63
  64 /* Packet types */
  65 #define PT_DRAWOP       0       /* drawing operation */
  66 #define PT_ID           1       /* announcement packet */
  67 #define PT_RREQ         2       /* repair request */
  68 #define PT_RREP         3       /* repair reply */
  69 #define PT_KILL         4       /* terminate participation */
  70 #define PT_PREQ         5       /* page vector request */
  71 #define PT_PREP         7       /* page vector reply */
  72
  73 #if 0
  74 /* flags */
  75 #define PF_USER         0x01    /* hint that packet has interactive data */
  76 #define PF_VIS          0x02    /* only visible ops wanted */
  77 #endif
  78
  79 struct PageID {
  80         nd_uint32_t p_sid;              /* session id of initiator */
  81         nd_uint32_t p_uid;              /* page number */
  82 };
  83
  84 struct dophdr {
  85         nd_uint32_t     dh_ts;          /* sender's timestamp */
  86         nd_uint16_t     dh_len;         /* body length */
  87         nd_uint8_t      dh_flags;
  88         nd_uint8_t      dh_type;        /* body type */
  89         /* body follows */
  90 };
  91 /*
  92  * Drawing op sub-types.
  93  */
  94 #define DT_RECT         2
  95 #define DT_LINE         3
  96 #define DT_ML           4
  97 #define DT_DEL          5
  98 #define DT_XFORM        6
  99 #define DT_ELL          7
 100 #define DT_CHAR         8
 101 #define DT_STR          9
 102 #define DT_NOP          10
 103 #define DT_PSCODE       11
 104 #define DT_PSCOMP       12
 105 #define DT_REF          13
 106 #define DT_SKIP         14
 107 #define DT_HOLE         15
 108 static const struct tok dop_str[] = {
 109         { DT_RECT,   "RECT"   },
 110         { DT_LINE,   "LINE"   },
 111         { DT_ML,     "ML"     },
 112         { DT_DEL,    "DEL"    },
 113         { DT_XFORM,  "XFORM"  },
 114         { DT_ELL,    "ELL"    },
 115         { DT_CHAR,   "CHAR"   },
 116         { DT_STR,    "STR"    },
 117         { DT_NOP,    "NOP"    },
 118         { DT_PSCODE, "PSCODE" },
 119         { DT_PSCOMP, "PSCOMP" },
 120         { DT_REF,    "REF"    },
 121         { DT_SKIP,   "SKIP"   },
 122         { DT_HOLE,   "HOLE"   },
 123         { 0, NULL }
 124 };
 125
 126 /*
 127  * A drawing operation.
 128  */
 129 struct pkt_dop {
 130         struct PageID pd_page;  /* page that operations apply to */
 131         nd_uint32_t     pd_sseq;        /* start sequence number */
 132         nd_uint32_t     pd_eseq;        /* end sequence number */
 133         /* drawing ops follow */
 134 };
 135
 136 /*
 137  * A repair request.
 138  */
 139 struct pkt_rreq {
 140         nd_uint32_t pr_id;        /* source id of drawops to be repaired */
 141         struct PageID pr_page;    /* page of drawops */
 142         nd_uint32_t pr_sseq;      /* start seqno */
 143         nd_uint32_t pr_eseq;      /* end seqno */
 144 };
 145
 146 /*
 147  * A repair reply.
 148  */
 149 struct pkt_rrep {
 150         nd_uint32_t pr_id;      /* original site id of ops  */
 151         struct pkt_dop pr_dop;
 152         /* drawing ops follow */
 153 };
 154
 155 struct id_off {
 156         nd_uint32_t id;
 157         nd_uint32_t off;
 158 };
 159
 160 struct pgstate {
 161         nd_uint32_t slot;
 162         struct PageID page;
 163         nd_uint16_t nid;
 164         nd_uint16_t rsvd;
 165         /* seqptr's */
 166 };
 167
 168 /*
 169  * An announcement packet.
 170  */
 171 struct pkt_id {
 172         nd_uint32_t pi_mslot;
 173         struct PageID    pi_mpage;        /* current page */
 174         struct pgstate pi_ps;
 175         /* seqptr's */
 176         /* null-terminated site name */
 177 };
 178
 179 struct pkt_preq {
 180         struct PageID  pp_page;
 181         nd_uint32_t  pp_low;
 182         nd_uint32_t  pp_high;
 183 };
 184
 185 struct pkt_prep {
 186         nd_uint32_t  pp_n;           /* size of pageid array */
 187         /* pgstate's follow */
 188 };
 189
 190 static int
 191 wb_id(netdissect_options *ndo,
 192       const struct pkt_id *id, u_int len)
 193 {
 194         u_int i;
 195         const u_char *sitename;
 196         const struct id_off *io;
 197         char c;
 198         u_int nid;
 199
 200         ND_PRINT(" wb-id:");
 201         if (len < sizeof(*id))
 202                 return (-1);
 203         len -= sizeof(*id);
 204
 205         ND_PRINT(" %u/%s:%u (max %u/%s:%u) ",
 206                GET_BE_U_4(id->pi_ps.slot),
 207                GET_IPADDR_STRING(id->pi_ps.page.p_sid),
 208                GET_BE_U_4(id->pi_ps.page.p_uid),
 209                GET_BE_U_4(id->pi_mslot),
 210                GET_IPADDR_STRING(id->pi_mpage.p_sid),
 211                GET_BE_U_4(id->pi_mpage.p_uid));
 212         /* now the rest of the fixed-size part of struct pkt_id */
 213         ND_TCHECK_SIZE(id);
 214
 215         nid = GET_BE_U_2(id->pi_ps.nid);
 216         if (len < sizeof(*io) * nid)
 217                 return (-1);
 218         len -= sizeof(*io) * nid;
 219         io = (const struct id_off *)(id + 1);
 220         sitename = (const u_char *)(io + nid);
 221
 222         c = '<';
 223         for (i = 0; i < nid; ++io, ++i) {
 224                 ND_PRINT("%c%s:%u",
 225                     c, GET_IPADDR_STRING(io->id), GET_BE_U_4(io->off));
 226                 c = ',';
 227         }
 228         ND_PRINT("> \"");
 229         nd_printjnp(ndo, sitename, len);
 230         ND_PRINT("\"");
 231         return (0);
 232 }
 233
 234 static int
 235 wb_rreq(netdissect_options *ndo,
 236         const struct pkt_rreq *rreq, u_int len)
 237 {
 238         ND_PRINT(" wb-rreq:");
 239         if (len < sizeof(*rreq))
 240                 return (-1);
 241
 242         ND_PRINT(" please repair %s %s:%u<%u:%u>",
 243                GET_IPADDR_STRING(rreq->pr_id),
 244                GET_IPADDR_STRING(rreq->pr_page.p_sid),
 245                GET_BE_U_4(rreq->pr_page.p_uid),
 246                GET_BE_U_4(rreq->pr_sseq),
 247                GET_BE_U_4(rreq->pr_eseq));
 248         return (0);
 249 }
 250
 251 static int
 252 wb_preq(netdissect_options *ndo,
 253         const struct pkt_preq *preq, u_int len)
 254 {
 255         ND_PRINT(" wb-preq:");
 256         if (len < sizeof(*preq))
 257                 return (-1);
 258
 259         ND_PRINT(" need %u/%s:%u",
 260                GET_BE_U_4(preq->pp_low),
 261                GET_IPADDR_STRING(preq->pp_page.p_sid),
 262                GET_BE_U_4(preq->pp_page.p_uid));
 263         /* now the rest of the fixed-size part of struct pkt_req */
 264         ND_TCHECK_SIZE(preq);
 265         return (0);
 266 }
 267
 268 static int
 269 wb_prep(netdissect_options *ndo,
 270         const struct pkt_prep *prep, u_int len)
 271 {
 272         u_int n;
 273         const struct pgstate *ps;
 274
 275         ND_PRINT(" wb-prep:");
 276         if (len < sizeof(*prep))
 277                 return (-1);
 278         n = GET_BE_U_4(prep->pp_n);
 279         ps = (const struct pgstate *)(prep + 1);
 280         while (n != 0) {
 281                 const struct id_off *io, *ie;
 282                 char c = '<';
 283
 284                 ND_PRINT(" %u/%s:%u",
 285                     GET_BE_U_4(ps->slot),
 286                     GET_IPADDR_STRING(ps->page.p_sid),
 287                     GET_BE_U_4(ps->page.p_uid));
 288                 /* now the rest of the fixed-size part of struct pgstate */
 289                 ND_TCHECK_SIZE(ps);
 290                 io = (const struct id_off *)(ps + 1);
 291                 for (ie = io + GET_U_1(ps->nid); io < ie; ++io) {
 292                         ND_PRINT("%c%s:%u", c, GET_IPADDR_STRING(io->id),
 293                             GET_BE_U_4(io->off));
 294                         c = ',';
 295                 }
 296                 ND_PRINT(">");
 297                 ps = (const struct pgstate *)io;
 298                 n--;
 299         }
 300         return 0;
 301 }
 302
 303 static void
 304 wb_dops(netdissect_options *ndo, const struct pkt_dop *dop,
 305         uint32_t ss, uint32_t es)
 306 {
 307         const struct dophdr *dh = (const struct dophdr *)((const u_char *)dop + sizeof(*dop));
 308
 309         ND_PRINT(" <");
 310         for ( ; ss <= es; ++ss) {
 311                 u_int t;
 312
 313                 t = GET_U_1(dh->dh_type);
 314
 315                 ND_PRINT(" %s", tok2str(dop_str, "dop-%u!", t));
 316                 if (t == DT_SKIP || t == DT_HOLE) {
 317                         uint32_t ts = GET_BE_U_4(dh->dh_ts);
 318                         ND_PRINT("%u", ts - ss + 1);
 319                         if (ss > ts || ts > es) {
 320                                 ND_PRINT("[|]");
 321                                 if (ts < ss)
 322                                         return;
 323                         }
 324                         ss = ts;
 325                 }
 326                 dh = DOP_NEXT(dh);
 327         }
 328         ND_PRINT(" >");
 329 }
 330
 331 static int
 332 wb_rrep(netdissect_options *ndo,
 333         const struct pkt_rrep *rrep, u_int len)
 334 {
 335         const struct pkt_dop *dop = &rrep->pr_dop;
 336
 337         ND_PRINT(" wb-rrep:");
 338         if (len < sizeof(*rrep))
 339                 return (-1);
 340         len -= sizeof(*rrep);
 341
 342         ND_PRINT(" for %s %s:%u<%u:%u>",
 343             GET_IPADDR_STRING(rrep->pr_id),
 344             GET_IPADDR_STRING(dop->pd_page.p_sid),
 345             GET_BE_U_4(dop->pd_page.p_uid),
 346             GET_BE_U_4(dop->pd_sseq),
 347             GET_BE_U_4(dop->pd_eseq));
 348
 349         if (ndo->ndo_vflag)
 350                 wb_dops(ndo, dop,
 351                         GET_BE_U_4(dop->pd_sseq),
 352                         GET_BE_U_4(dop->pd_eseq));
 353         return (0);
 354 }
 355
 356 static int
 357 wb_drawop(netdissect_options *ndo,
 358           const struct pkt_dop *dop, u_int len)
 359 {
 360         ND_PRINT(" wb-dop:");
 361         if (len < sizeof(*dop))
 362                 return (-1);
 363         len -= sizeof(*dop);
 364
 365         ND_PRINT(" %s:%u<%u:%u>",
 366             GET_IPADDR_STRING(dop->pd_page.p_sid),
 367             GET_BE_U_4(dop->pd_page.p_uid),
 368             GET_BE_U_4(dop->pd_sseq),
 369             GET_BE_U_4(dop->pd_eseq));
 370
 371         if (ndo->ndo_vflag)
 372                 wb_dops(ndo, dop,
 373                         GET_BE_U_4(dop->pd_sseq),
 374                         GET_BE_U_4(dop->pd_eseq));
 375         return (0);
 376 }
 377
 378 /*
 379  * Print whiteboard multicast packets.
 380  */
 381 void
 382 wb_print(netdissect_options *ndo,
 383          const u_char *hdr, u_int len)
 384 {
 385         const struct pkt_hdr *ph;
 386         uint8_t type;
 387         int print_result;
 388
 389         ndo->ndo_protocol = "wb";
 390         ph = (const struct pkt_hdr *)hdr;
 391         if (len < sizeof(*ph))
 392                 goto invalid;
 393         ND_TCHECK_SIZE(ph);
 394         len -= sizeof(*ph);
 395
 396         if (GET_U_1(ph->ph_flags))
 397                 ND_PRINT("*");
 398         type = GET_U_1(ph->ph_type);
 399         switch (type) {
 400
 401         case PT_KILL:
 402                 ND_PRINT(" wb-kill");
 403                 return;
 404
 405         case PT_ID:
 406                 print_result = wb_id(ndo, (const struct pkt_id *)(ph + 1), len);
 407                 break;
 408
 409         case PT_RREQ:
 410                 print_result = wb_rreq(ndo, (const struct pkt_rreq *)(ph + 1), len);
 411                 break;
 412
 413         case PT_RREP:
 414                 print_result = wb_rrep(ndo, (const struct pkt_rrep *)(ph + 1), len);
 415                 break;
 416
 417         case PT_DRAWOP:
 418                 print_result = wb_drawop(ndo, (const struct pkt_dop *)(ph + 1), len);
 419                 break;
 420
 421         case PT_PREQ:
 422                 print_result = wb_preq(ndo, (const struct pkt_preq *)(ph + 1), len);
 423                 break;
 424
 425         case PT_PREP:
 426                 print_result = wb_prep(ndo, (const struct pkt_prep *)(ph + 1), len);
 427                 break;
 428
 429         default:
 430                 ND_PRINT(" wb-%u!", type);
 431                 print_result = -1;
 432         }
 433         if (print_result < 0)
 434                 goto invalid;
 435         return;
 436
 437 invalid:
 438         nd_print_invalid(ndo);
 439 }