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 #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 #endif
  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 static const struct tok dop_str[] = {
 113         { DT_RECT,   "RECT"   },
 114         { DT_LINE,   "LINE"   },
 115         { DT_ML,     "ML"     },
 116         { DT_DEL,    "DEL"    },
 117         { DT_XFORM,  "XFORM"  },
 118         { DT_ELL,    "ELL"    },
 119         { DT_CHAR,   "CHAR"   },
 120         { DT_STR,    "STR"    },
 121         { DT_NOP,    "NOP"    },
 122         { DT_PSCODE, "PSCODE" },
 123         { DT_PSCOMP, "PSCOMP" },
 124         { DT_REF,    "REF"    },
 125         { DT_SKIP,   "SKIP"   },
 126         { DT_HOLE,   "HOLE"   },
 127         { 0, NULL }
 128 };
 129
 130 /*
 131  * A drawing operation.
 132  */
 133 struct pkt_dop {
 134         struct PageID pd_page;  /* page that operations apply to */
 135         nd_uint32_t     pd_sseq;        /* start sequence number */
 136         nd_uint32_t     pd_eseq;        /* end sequence number */
 137         /* drawing ops follow */
 138 };
 139
 140 /*
 141  * A repair request.
 142  */
 143 struct pkt_rreq {
 144         nd_uint32_t pr_id;        /* source id of drawops to be repaired */
 145         struct PageID pr_page;    /* page of drawops */
 146         nd_uint32_t pr_sseq;      /* start seqno */
 147         nd_uint32_t pr_eseq;      /* end seqno */
 148 };
 149
 150 /*
 151  * A repair reply.
 152  */
 153 struct pkt_rrep {
 154         nd_uint32_t pr_id;      /* original site id of ops  */
 155         struct pkt_dop pr_dop;
 156         /* drawing ops follow */
 157 };
 158
 159 struct id_off {
 160         nd_uint32_t id;
 161         nd_uint32_t off;
 162 };
 163
 164 struct pgstate {
 165         nd_uint32_t slot;
 166         struct PageID page;
 167         nd_uint16_t nid;
 168         nd_uint16_t rsvd;
 169         /* seqptr's */
 170 };
 171
 172 /*
 173  * An announcement packet.
 174  */
 175 struct pkt_id {
 176         nd_uint32_t pi_mslot;
 177         struct PageID    pi_mpage;        /* current page */
 178         struct pgstate pi_ps;
 179         /* seqptr's */
 180         /* null-terminated site name */
 181 };
 182
 183 struct pkt_preq {
 184         struct PageID  pp_page;
 185         nd_uint32_t  pp_low;
 186         nd_uint32_t  pp_high;
 187 };
 188
 189 struct pkt_prep {
 190         nd_uint32_t  pp_n;           /* size of pageid array */
 191         /* pgstate's follow */
 192 };
 193
 194 static int
 195 wb_id(netdissect_options *ndo,
 196       const struct pkt_id *id, u_int len)
 197 {
 198         u_int i;
 199         const u_char *sitename;
 200         const struct id_off *io;
 201         char c;
 202         u_int nid;
 203
 204         ND_PRINT(" wb-id:");
 205         if (len < sizeof(*id))
 206                 return (-1);
 207         len -= sizeof(*id);
 208
 209         ND_PRINT(" %u/%s:%u (max %u/%s:%u) ",
 210                GET_BE_U_4(id->pi_ps.slot),
 211                GET_IPADDR_STRING(id->pi_ps.page.p_sid),
 212                GET_BE_U_4(id->pi_ps.page.p_uid),
 213                GET_BE_U_4(id->pi_mslot),
 214                GET_IPADDR_STRING(id->pi_mpage.p_sid),
 215                GET_BE_U_4(id->pi_mpage.p_uid));
 216         /* now the rest of the fixed-size part of struct pkt_id */
 217         ND_TCHECK_SIZE(id);
 218
 219         nid = GET_BE_U_2(id->pi_ps.nid);
 220         if (len < sizeof(*io) * nid)
 221                 return (-1);
 222         len -= sizeof(*io) * nid;
 223         io = (const struct id_off *)(id + 1);
 224         sitename = (const u_char *)(io + nid);
 225
 226         c = '<';
 227         for (i = 0; i < nid; ++io, ++i) {
 228                 ND_PRINT("%c%s:%u",
 229                     c, GET_IPADDR_STRING(io->id), GET_BE_U_4(io->off));
 230                 c = ',';
 231         }
 232         ND_PRINT("> \"");
 233         nd_printjnp(ndo, sitename, len);
 234         ND_PRINT("\"");
 235         return (0);
 236 }
 237
 238 static int
 239 wb_rreq(netdissect_options *ndo,
 240         const struct pkt_rreq *rreq, u_int len)
 241 {
 242         ND_PRINT(" wb-rreq:");
 243         if (len < sizeof(*rreq))
 244                 return (-1);
 245
 246         ND_PRINT(" please repair %s %s:%u<%u:%u>",
 247                GET_IPADDR_STRING(rreq->pr_id),
 248                GET_IPADDR_STRING(rreq->pr_page.p_sid),
 249                GET_BE_U_4(rreq->pr_page.p_uid),
 250                GET_BE_U_4(rreq->pr_sseq),
 251                GET_BE_U_4(rreq->pr_eseq));
 252         return (0);
 253 }
 254
 255 static int
 256 wb_preq(netdissect_options *ndo,
 257         const struct pkt_preq *preq, u_int len)
 258 {
 259         ND_PRINT(" wb-preq:");
 260         if (len < sizeof(*preq))
 261                 return (-1);
 262
 263         ND_PRINT(" need %u/%s:%u",
 264                GET_BE_U_4(preq->pp_low),
 265                GET_IPADDR_STRING(preq->pp_page.p_sid),
 266                GET_BE_U_4(preq->pp_page.p_uid));
 267         /* now the rest of the fixed-size part of struct pkt_req */
 268         ND_TCHECK_SIZE(preq);
 269         return (0);
 270 }
 271
 272 static int
 273 wb_prep(netdissect_options *ndo,
 274         const struct pkt_prep *prep, u_int len)
 275 {
 276         u_int n;
 277         const struct pgstate *ps;
 278
 279         ND_PRINT(" wb-prep:");
 280         if (len < sizeof(*prep))
 281                 return (-1);
 282         n = GET_BE_U_4(prep->pp_n);
 283         ps = (const struct pgstate *)(prep + 1);
 284         while (n != 0) {
 285                 const struct id_off *io, *ie;
 286                 char c = '<';
 287
 288                 ND_PRINT(" %u/%s:%u",
 289                     GET_BE_U_4(ps->slot),
 290                     GET_IPADDR_STRING(ps->page.p_sid),
 291                     GET_BE_U_4(ps->page.p_uid));
 292                 /* now the rest of the fixed-size part of struct pgstate */
 293                 ND_TCHECK_SIZE(ps);
 294                 io = (const struct id_off *)(ps + 1);
 295                 for (ie = io + GET_U_1(ps->nid); io < ie; ++io) {
 296                         ND_PRINT("%c%s:%u", c, GET_IPADDR_STRING(io->id),
 297                             GET_BE_U_4(io->off));
 298                         c = ',';
 299                 }
 300                 ND_PRINT(">");
 301                 ps = (const struct pgstate *)io;
 302                 n--;
 303         }
 304         return 0;
 305 }
 306
 307 static void
 308 wb_dops(netdissect_options *ndo, const struct pkt_dop *dop,
 309         uint32_t ss, uint32_t es)
 310 {
 311         const struct dophdr *dh = (const struct dophdr *)((const u_char *)dop + sizeof(*dop));
 312
 313         ND_PRINT(" <");
 314         for ( ; ss <= es; ++ss) {
 315                 u_int t;
 316
 317                 t = GET_U_1(dh->dh_type);
 318
 319                 ND_PRINT(" %s", tok2str(dop_str, "dop-%u!", t));
 320                 if (t == DT_SKIP || t == DT_HOLE) {
 321                         uint32_t ts = GET_BE_U_4(dh->dh_ts);
 322                         ND_PRINT("%u", ts - ss + 1);
 323                         if (ss > ts || ts > es) {
 324                                 ND_PRINT("[|]");
 325                                 if (ts < ss)
 326                                         return;
 327                         }
 328                         ss = ts;
 329                 }
 330                 dh = DOP_NEXT(dh);
 331         }
 332         ND_PRINT(" >");
 333 }
 334
 335 static int
 336 wb_rrep(netdissect_options *ndo,
 337         const struct pkt_rrep *rrep, u_int len)
 338 {
 339         const struct pkt_dop *dop = &rrep->pr_dop;
 340
 341         ND_PRINT(" wb-rrep:");
 342         if (len < sizeof(*rrep))
 343                 return (-1);
 344         len -= sizeof(*rrep);
 345
 346         ND_PRINT(" for %s %s:%u<%u:%u>",
 347             GET_IPADDR_STRING(rrep->pr_id),
 348             GET_IPADDR_STRING(dop->pd_page.p_sid),
 349             GET_BE_U_4(dop->pd_page.p_uid),
 350             GET_BE_U_4(dop->pd_sseq),
 351             GET_BE_U_4(dop->pd_eseq));
 352
 353         if (ndo->ndo_vflag)
 354                 wb_dops(ndo, dop,
 355                         GET_BE_U_4(dop->pd_sseq),
 356                         GET_BE_U_4(dop->pd_eseq));
 357         return (0);
 358 }
 359
 360 static int
 361 wb_drawop(netdissect_options *ndo,
 362           const struct pkt_dop *dop, u_int len)
 363 {
 364         ND_PRINT(" wb-dop:");
 365         if (len < sizeof(*dop))
 366                 return (-1);
 367         len -= sizeof(*dop);
 368
 369         ND_PRINT(" %s:%u<%u:%u>",
 370             GET_IPADDR_STRING(dop->pd_page.p_sid),
 371             GET_BE_U_4(dop->pd_page.p_uid),
 372             GET_BE_U_4(dop->pd_sseq),
 373             GET_BE_U_4(dop->pd_eseq));
 374
 375         if (ndo->ndo_vflag)
 376                 wb_dops(ndo, dop,
 377                         GET_BE_U_4(dop->pd_sseq),
 378                         GET_BE_U_4(dop->pd_eseq));
 379         return (0);
 380 }
 381
 382 /*
 383  * Print whiteboard multicast packets.
 384  */
 385 void
 386 wb_print(netdissect_options *ndo,
 387          const u_char *hdr, u_int len)
 388 {
 389         const struct pkt_hdr *ph;
 390         uint8_t type;
 391         int print_result;
 392
 393         ndo->ndo_protocol = "wb";
 394         ph = (const struct pkt_hdr *)hdr;
 395         if (len < sizeof(*ph))
 396                 goto invalid;
 397         ND_TCHECK_SIZE(ph);
 398         len -= sizeof(*ph);
 399
 400         if (GET_U_1(ph->ph_flags))
 401                 ND_PRINT("*");
 402         type = GET_U_1(ph->ph_type);
 403         switch (type) {
 404
 405         case PT_KILL:
 406                 ND_PRINT(" wb-kill");
 407                 return;
 408
 409         case PT_ID:
 410                 print_result = wb_id(ndo, (const struct pkt_id *)(ph + 1), len);
 411                 break;
 412
 413         case PT_RREQ:
 414                 print_result = wb_rreq(ndo, (const struct pkt_rreq *)(ph + 1), len);
 415                 break;
 416
 417         case PT_RREP:
 418                 print_result = wb_rrep(ndo, (const struct pkt_rrep *)(ph + 1), len);
 419                 break;
 420
 421         case PT_DRAWOP:
 422                 print_result = wb_drawop(ndo, (const struct pkt_dop *)(ph + 1), len);
 423                 break;
 424
 425         case PT_PREQ:
 426                 print_result = wb_preq(ndo, (const struct pkt_preq *)(ph + 1), len);
 427                 break;
 428
 429         case PT_PREP:
 430                 print_result = wb_prep(ndo, (const struct pkt_prep *)(ph + 1), len);
 431                 break;
 432
 433         default:
 434                 ND_PRINT(" wb-%u!", type);
 435                 print_result = -1;
 436         }
 437         if (print_result < 0)
 438                 goto invalid;
 439         return;
 440
 441 invalid:
 442         nd_print_invalid(ndo);
 443 }