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 #define ND_LONGJMP_FROM_TCHECK
  31 #include "netdissect.h"
  32 #include "addrtoname.h"
  33 #include "extract.h"
  34
  35
  36 #if 0
  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 #endif
  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 #if 0
  76 /* flags */
  77 #define PF_USER         0x01    /* hint that packet has interactive data */
  78 #define PF_VIS          0x02    /* only visible ops wanted */
  79 #endif
  80
  81 struct PageID {
  82         nd_uint32_t p_sid;              /* session id of initiator */
  83         nd_uint32_t p_uid;              /* page number */
  84 };
  85
  86 struct dophdr {
  87         nd_uint32_t     dh_ts;          /* sender's timestamp */
  88         nd_uint16_t     dh_len;         /* body length */
  89         nd_uint8_t      dh_flags;
  90         nd_uint8_t      dh_type;        /* body type */
  91         /* body follows */
  92 };
  93 /*
  94  * Drawing op sub-types.
  95  */
  96 #define DT_RECT         2
  97 #define DT_LINE         3
  98 #define DT_ML           4
  99 #define DT_DEL          5
 100 #define DT_XFORM        6
 101 #define DT_ELL          7
 102 #define DT_CHAR         8
 103 #define DT_STR          9
 104 #define DT_NOP          10
 105 #define DT_PSCODE       11
 106 #define DT_PSCOMP       12
 107 #define DT_REF          13
 108 #define DT_SKIP         14
 109 #define DT_HOLE         15
 110 static const struct tok dop_str[] = {
 111         { DT_RECT,   "RECT"   },
 112         { DT_LINE,   "LINE"   },
 113         { DT_ML,     "ML"     },
 114         { DT_DEL,    "DEL"    },
 115         { DT_XFORM,  "XFORM"  },
 116         { DT_ELL,    "ELL"    },
 117         { DT_CHAR,   "CHAR"   },
 118         { DT_STR,    "STR"    },
 119         { DT_NOP,    "NOP"    },
 120         { DT_PSCODE, "PSCODE" },
 121         { DT_PSCOMP, "PSCOMP" },
 122         { DT_REF,    "REF"    },
 123         { DT_SKIP,   "SKIP"   },
 124         { DT_HOLE,   "HOLE"   },
 125         { 0, NULL }
 126 };
 127
 128 /*
 129  * A drawing operation.
 130  */
 131 struct pkt_dop {
 132         struct PageID pd_page;  /* page that operations apply to */
 133         nd_uint32_t     pd_sseq;        /* start sequence number */
 134         nd_uint32_t     pd_eseq;        /* end sequence number */
 135         /* drawing ops follow */
 136 };
 137
 138 /*
 139  * A repair request.
 140  */
 141 struct pkt_rreq {
 142         nd_uint32_t pr_id;        /* source id of drawops to be repaired */
 143         struct PageID pr_page;    /* page of drawops */
 144         nd_uint32_t pr_sseq;      /* start seqno */
 145         nd_uint32_t pr_eseq;      /* end seqno */
 146 };
 147
 148 /*
 149  * A repair reply.
 150  */
 151 struct pkt_rrep {
 152         nd_uint32_t pr_id;      /* original site id of ops  */
 153         struct pkt_dop pr_dop;
 154         /* drawing ops follow */
 155 };
 156
 157 struct id_off {
 158         nd_uint32_t id;
 159         nd_uint32_t off;
 160 };
 161
 162 struct pgstate {
 163         nd_uint32_t slot;
 164         struct PageID page;
 165         nd_uint16_t nid;
 166         nd_uint16_t rsvd;
 167         /* seqptr's */
 168 };
 169
 170 /*
 171  * An announcement packet.
 172  */
 173 struct pkt_id {
 174         nd_uint32_t pi_mslot;
 175         struct PageID    pi_mpage;        /* current page */
 176         struct pgstate pi_ps;
 177         /* seqptr's */
 178         /* null-terminated site name */
 179 };
 180
 181 struct pkt_preq {
 182         struct PageID  pp_page;
 183         nd_uint32_t  pp_low;
 184         nd_uint32_t  pp_high;
 185 };
 186
 187 struct pkt_prep {
 188         nd_uint32_t  pp_n;           /* size of pageid array */
 189         /* pgstate's follow */
 190 };
 191
 192 static int
 193 wb_id(netdissect_options *ndo,
 194       const struct pkt_id *id, u_int len)
 195 {
 196         u_int i;
 197         const u_char *sitename;
 198         const struct id_off *io;
 199         char c;
 200         u_int nid;
 201
 202         ND_PRINT(" wb-id:");
 203         if (len < sizeof(*id))
 204                 return (-1);
 205         len -= sizeof(*id);
 206
 207         ND_PRINT(" %u/%s:%u (max %u/%s:%u) ",
 208                GET_BE_U_4(id->pi_ps.slot),
 209                GET_IPADDR_STRING(id->pi_ps.page.p_sid),
 210                GET_BE_U_4(id->pi_ps.page.p_uid),
 211                GET_BE_U_4(id->pi_mslot),
 212                GET_IPADDR_STRING(id->pi_mpage.p_sid),
 213                GET_BE_U_4(id->pi_mpage.p_uid));
 214         /* now the rest of the fixed-size part of struct pkt_id */
 215         ND_TCHECK_SIZE(id);
 216
 217         nid = GET_BE_U_2(id->pi_ps.nid);
 218         if (len < sizeof(*io) * nid)
 219                 return (-1);
 220         len -= sizeof(*io) * nid;
 221         io = (const struct id_off *)(id + 1);
 222         sitename = (const u_char *)(io + nid);
 223
 224         c = '<';
 225         for (i = 0; i < nid; ++io, ++i) {
 226                 ND_PRINT("%c%s:%u",
 227                     c, GET_IPADDR_STRING(io->id), GET_BE_U_4(io->off));
 228                 c = ',';
 229         }
 230         ND_PRINT("> \"");
 231         nd_printjnp(ndo, sitename, len);
 232         ND_PRINT("\"");
 233         return (0);
 234 }
 235
 236 static int
 237 wb_rreq(netdissect_options *ndo,
 238         const struct pkt_rreq *rreq, u_int len)
 239 {
 240         ND_PRINT(" wb-rreq:");
 241         if (len < sizeof(*rreq))
 242                 return (-1);
 243
 244         ND_PRINT(" please repair %s %s:%u<%u:%u>",
 245                GET_IPADDR_STRING(rreq->pr_id),
 246                GET_IPADDR_STRING(rreq->pr_page.p_sid),
 247                GET_BE_U_4(rreq->pr_page.p_uid),
 248                GET_BE_U_4(rreq->pr_sseq),
 249                GET_BE_U_4(rreq->pr_eseq));
 250         return (0);
 251 }
 252
 253 static int
 254 wb_preq(netdissect_options *ndo,
 255         const struct pkt_preq *preq, u_int len)
 256 {
 257         ND_PRINT(" wb-preq:");
 258         if (len < sizeof(*preq))
 259                 return (-1);
 260
 261         ND_PRINT(" need %u/%s:%u",
 262                GET_BE_U_4(preq->pp_low),
 263                GET_IPADDR_STRING(preq->pp_page.p_sid),
 264                GET_BE_U_4(preq->pp_page.p_uid));
 265         /* now the rest of the fixed-size part of struct pkt_req */
 266         ND_TCHECK_SIZE(preq);
 267         return (0);
 268 }
 269
 270 static int
 271 wb_prep(netdissect_options *ndo,
 272         const struct pkt_prep *prep, u_int len)
 273 {
 274         u_int n;
 275         const struct pgstate *ps;
 276
 277         ND_PRINT(" wb-prep:");
 278         if (len < sizeof(*prep))
 279                 return (-1);
 280         n = GET_BE_U_4(prep->pp_n);
 281         ps = (const struct pgstate *)(prep + 1);
 282         while (n != 0) {
 283                 const struct id_off *io, *ie;
 284                 char c = '<';
 285
 286                 ND_PRINT(" %u/%s:%u",
 287                     GET_BE_U_4(ps->slot),
 288                     GET_IPADDR_STRING(ps->page.p_sid),
 289                     GET_BE_U_4(ps->page.p_uid));
 290                 /* now the rest of the fixed-size part of struct pgstate */
 291                 ND_TCHECK_SIZE(ps);
 292                 io = (const struct id_off *)(ps + 1);
 293                 for (ie = io + GET_U_1(ps->nid); io < ie; ++io) {
 294                         ND_PRINT("%c%s:%u", c, GET_IPADDR_STRING(io->id),
 295                             GET_BE_U_4(io->off));
 296                         c = ',';
 297                 }
 298                 ND_PRINT(">");
 299                 ps = (const struct pgstate *)io;
 300                 n--;
 301         }
 302         return 0;
 303 }
 304
 305 static void
 306 wb_dops(netdissect_options *ndo, const struct pkt_dop *dop,
 307         uint32_t ss, uint32_t es)
 308 {
 309         const struct dophdr *dh = (const struct dophdr *)((const u_char *)dop + sizeof(*dop));
 310
 311         ND_PRINT(" <");
 312         for ( ; ss <= es; ++ss) {
 313                 u_int t;
 314
 315                 t = GET_U_1(dh->dh_type);
 316
 317                 ND_PRINT(" %s", tok2str(dop_str, "dop-%u!", t));
 318                 if (t == DT_SKIP || t == DT_HOLE) {
 319                         uint32_t ts = GET_BE_U_4(dh->dh_ts);
 320                         ND_PRINT("%u", ts - ss + 1);
 321                         if (ss > ts || ts > es) {
 322                                 ND_PRINT("[|]");
 323                                 if (ts < ss)
 324                                         return;
 325                         }
 326                         ss = ts;
 327                 }
 328                 dh = DOP_NEXT(dh);
 329         }
 330         ND_PRINT(" >");
 331 }
 332
 333 static int
 334 wb_rrep(netdissect_options *ndo,
 335         const struct pkt_rrep *rrep, u_int len)
 336 {
 337         const struct pkt_dop *dop = &rrep->pr_dop;
 338
 339         ND_PRINT(" wb-rrep:");
 340         if (len < sizeof(*rrep))
 341                 return (-1);
 342         len -= sizeof(*rrep);
 343
 344         ND_PRINT(" for %s %s:%u<%u:%u>",
 345             GET_IPADDR_STRING(rrep->pr_id),
 346             GET_IPADDR_STRING(dop->pd_page.p_sid),
 347             GET_BE_U_4(dop->pd_page.p_uid),
 348             GET_BE_U_4(dop->pd_sseq),
 349             GET_BE_U_4(dop->pd_eseq));
 350
 351         if (ndo->ndo_vflag)
 352                 wb_dops(ndo, dop,
 353                         GET_BE_U_4(dop->pd_sseq),
 354                         GET_BE_U_4(dop->pd_eseq));
 355         return (0);
 356 }
 357
 358 static int
 359 wb_drawop(netdissect_options *ndo,
 360           const struct pkt_dop *dop, u_int len)
 361 {
 362         ND_PRINT(" wb-dop:");
 363         if (len < sizeof(*dop))
 364                 return (-1);
 365         len -= sizeof(*dop);
 366
 367         ND_PRINT(" %s:%u<%u:%u>",
 368             GET_IPADDR_STRING(dop->pd_page.p_sid),
 369             GET_BE_U_4(dop->pd_page.p_uid),
 370             GET_BE_U_4(dop->pd_sseq),
 371             GET_BE_U_4(dop->pd_eseq));
 372
 373         if (ndo->ndo_vflag)
 374                 wb_dops(ndo, dop,
 375                         GET_BE_U_4(dop->pd_sseq),
 376                         GET_BE_U_4(dop->pd_eseq));
 377         return (0);
 378 }
 379
 380 /*
 381  * Print whiteboard multicast packets.
 382  */
 383 void
 384 wb_print(netdissect_options *ndo,
 385          const u_char *hdr, u_int len)
 386 {
 387         const struct pkt_hdr *ph;
 388         uint8_t type;
 389         int print_result;
 390
 391         ndo->ndo_protocol = "wb";
 392         ph = (const struct pkt_hdr *)hdr;
 393         if (len < sizeof(*ph))
 394                 goto invalid;
 395         ND_TCHECK_SIZE(ph);
 396         len -= sizeof(*ph);
 397
 398         if (GET_U_1(ph->ph_flags))
 399                 ND_PRINT("*");
 400         type = GET_U_1(ph->ph_type);
 401         switch (type) {
 402
 403         case PT_KILL:
 404                 ND_PRINT(" wb-kill");
 405                 return;
 406
 407         case PT_ID:
 408                 print_result = wb_id(ndo, (const struct pkt_id *)(ph + 1), len);
 409                 break;
 410
 411         case PT_RREQ:
 412                 print_result = wb_rreq(ndo, (const struct pkt_rreq *)(ph + 1), len);
 413                 break;
 414
 415         case PT_RREP:
 416                 print_result = wb_rrep(ndo, (const struct pkt_rrep *)(ph + 1), len);
 417                 break;
 418
 419         case PT_DRAWOP:
 420                 print_result = wb_drawop(ndo, (const struct pkt_dop *)(ph + 1), len);
 421                 break;
 422
 423         case PT_PREQ:
 424                 print_result = wb_preq(ndo, (const struct pkt_preq *)(ph + 1), len);
 425                 break;
 426
 427         case PT_PREP:
 428                 print_result = wb_prep(ndo, (const struct pkt_prep *)(ph + 1), len);
 429                 break;
 430
 431         default:
 432                 ND_PRINT(" wb-%u!", type);
 433                 print_result = -1;
 434         }
 435         if (print_result < 0)
 436                 goto invalid;
 437         return;
 438
 439 invalid:
 440         nd_print_invalid(ndo);
 441 }