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 #ifdef PF_USER
  77 #undef PF_USER                  /* {Digital,Tru64} UNIX define this, alas */
  78 #endif
  79
  80 /* flags */
  81 #define PF_USER         0x01    /* hint that packet has interactive data */
  82 #define PF_VIS          0x02    /* only visible ops wanted */
  83 #endif
  84
  85 struct PageID {
  86         nd_uint32_t p_sid;              /* session id of initiator */
  87         nd_uint32_t p_uid;              /* page number */
  88 };
  89
  90 struct dophdr {
  91         nd_uint32_t     dh_ts;          /* sender's timestamp */
  92         nd_uint16_t     dh_len;         /* body length */
  93         nd_uint8_t      dh_flags;
  94         nd_uint8_t      dh_type;        /* body type */
  95         /* body follows */
  96 };
  97 /*
  98  * Drawing op sub-types.
  99  */
 100 #define DT_RECT         2
 101 #define DT_LINE         3
 102 #define DT_ML           4
 103 #define DT_DEL          5
 104 #define DT_XFORM        6
 105 #define DT_ELL          7
 106 #define DT_CHAR         8
 107 #define DT_STR          9
 108 #define DT_NOP          10
 109 #define DT_PSCODE       11
 110 #define DT_PSCOMP       12
 111 #define DT_REF          13
 112 #define DT_SKIP         14
 113 #define DT_HOLE         15
 114 static const struct tok dop_str[] = {
 115         { DT_RECT,   "RECT"   },
 116         { DT_LINE,   "LINE"   },
 117         { DT_ML,     "ML"     },
 118         { DT_DEL,    "DEL"    },
 119         { DT_XFORM,  "XFORM"  },
 120         { DT_ELL,    "ELL"    },
 121         { DT_CHAR,   "CHAR"   },
 122         { DT_STR,    "STR"    },
 123         { DT_NOP,    "NOP"    },
 124         { DT_PSCODE, "PSCODE" },
 125         { DT_PSCOMP, "PSCOMP" },
 126         { DT_REF,    "REF"    },
 127         { DT_SKIP,   "SKIP"   },
 128         { DT_HOLE,   "HOLE"   },
 129         { 0, NULL }
 130 };
 131
 132 /*
 133  * A drawing operation.
 134  */
 135 struct pkt_dop {
 136         struct PageID pd_page;  /* page that operations apply to */
 137         nd_uint32_t     pd_sseq;        /* start sequence number */
 138         nd_uint32_t     pd_eseq;        /* end sequence number */
 139         /* drawing ops follow */
 140 };
 141
 142 /*
 143  * A repair request.
 144  */
 145 struct pkt_rreq {
 146         nd_uint32_t pr_id;        /* source id of drawops to be repaired */
 147         struct PageID pr_page;    /* page of drawops */
 148         nd_uint32_t pr_sseq;      /* start seqno */
 149         nd_uint32_t pr_eseq;      /* end seqno */
 150 };
 151
 152 /*
 153  * A repair reply.
 154  */
 155 struct pkt_rrep {
 156         nd_uint32_t pr_id;      /* original site id of ops  */
 157         struct pkt_dop pr_dop;
 158         /* drawing ops follow */
 159 };
 160
 161 struct id_off {
 162         nd_uint32_t id;
 163         nd_uint32_t off;
 164 };
 165
 166 struct pgstate {
 167         nd_uint32_t slot;
 168         struct PageID page;
 169         nd_uint16_t nid;
 170         nd_uint16_t rsvd;
 171         /* seqptr's */
 172 };
 173
 174 /*
 175  * An announcement packet.
 176  */
 177 struct pkt_id {
 178         nd_uint32_t pi_mslot;
 179         struct PageID    pi_mpage;        /* current page */
 180         struct pgstate pi_ps;
 181         /* seqptr's */
 182         /* null-terminated site name */
 183 };
 184
 185 struct pkt_preq {
 186         struct PageID  pp_page;
 187         nd_uint32_t  pp_low;
 188         nd_uint32_t  pp_high;
 189 };
 190
 191 struct pkt_prep {
 192         nd_uint32_t  pp_n;           /* size of pageid array */
 193         /* pgstate's follow */
 194 };
 195
 196 static int
 197 wb_id(netdissect_options *ndo,
 198       const struct pkt_id *id, u_int len)
 199 {
 200         u_int i;
 201         const u_char *sitename;
 202         const struct id_off *io;
 203         char c;
 204         u_int nid;
 205
 206         ND_PRINT(" wb-id:");
 207         if (len < sizeof(*id))
 208                 return (-1);
 209         len -= sizeof(*id);
 210
 211         ND_PRINT(" %u/%s:%u (max %u/%s:%u) ",
 212                GET_BE_U_4(id->pi_ps.slot),
 213                GET_IPADDR_STRING(id->pi_ps.page.p_sid),
 214                GET_BE_U_4(id->pi_ps.page.p_uid),
 215                GET_BE_U_4(id->pi_mslot),
 216                GET_IPADDR_STRING(id->pi_mpage.p_sid),
 217                GET_BE_U_4(id->pi_mpage.p_uid));
 218         /* now the rest of the fixed-size part of struct pkt_id */
 219         ND_TCHECK_SIZE(id);
 220
 221         nid = GET_BE_U_2(id->pi_ps.nid);
 222         if (len < sizeof(*io) * nid)
 223                 return (-1);
 224         len -= sizeof(*io) * nid;
 225         io = (const struct id_off *)(id + 1);
 226         sitename = (const u_char *)(io + nid);
 227
 228         c = '<';
 229         for (i = 0; i < nid; ++io, ++i) {
 230                 ND_PRINT("%c%s:%u",
 231                     c, GET_IPADDR_STRING(io->id), GET_BE_U_4(io->off));
 232                 c = ',';
 233         }
 234         ND_PRINT("> \"");
 235         nd_printjnp(ndo, sitename, len);
 236         ND_PRINT("\"");
 237         return (0);
 238 }
 239
 240 static int
 241 wb_rreq(netdissect_options *ndo,
 242         const struct pkt_rreq *rreq, u_int len)
 243 {
 244         ND_PRINT(" wb-rreq:");
 245         if (len < sizeof(*rreq))
 246                 return (-1);
 247
 248         ND_PRINT(" please repair %s %s:%u<%u:%u>",
 249                GET_IPADDR_STRING(rreq->pr_id),
 250                GET_IPADDR_STRING(rreq->pr_page.p_sid),
 251                GET_BE_U_4(rreq->pr_page.p_uid),
 252                GET_BE_U_4(rreq->pr_sseq),
 253                GET_BE_U_4(rreq->pr_eseq));
 254         return (0);
 255 }
 256
 257 static int
 258 wb_preq(netdissect_options *ndo,
 259         const struct pkt_preq *preq, u_int len)
 260 {
 261         ND_PRINT(" wb-preq:");
 262         if (len < sizeof(*preq))
 263                 return (-1);
 264
 265         ND_PRINT(" need %u/%s:%u",
 266                GET_BE_U_4(preq->pp_low),
 267                GET_IPADDR_STRING(preq->pp_page.p_sid),
 268                GET_BE_U_4(preq->pp_page.p_uid));
 269         /* now the rest of the fixed-size part of struct pkt_req */
 270         ND_TCHECK_SIZE(preq);
 271         return (0);
 272 }
 273
 274 static int
 275 wb_prep(netdissect_options *ndo,
 276         const struct pkt_prep *prep, u_int len)
 277 {
 278         u_int n;
 279         const struct pgstate *ps;
 280
 281         ND_PRINT(" wb-prep:");
 282         if (len < sizeof(*prep))
 283                 return (-1);
 284         n = GET_BE_U_4(prep->pp_n);
 285         ps = (const struct pgstate *)(prep + 1);
 286         while (n != 0) {
 287                 const struct id_off *io, *ie;
 288                 char c = '<';
 289
 290                 ND_PRINT(" %u/%s:%u",
 291                     GET_BE_U_4(ps->slot),
 292                     GET_IPADDR_STRING(ps->page.p_sid),
 293                     GET_BE_U_4(ps->page.p_uid));
 294                 /* now the rest of the fixed-size part of struct pgstate */
 295                 ND_TCHECK_SIZE(ps);
 296                 io = (const struct id_off *)(ps + 1);
 297                 for (ie = io + GET_U_1(ps->nid); io < ie; ++io) {
 298                         ND_PRINT("%c%s:%u", c, GET_IPADDR_STRING(io->id),
 299                             GET_BE_U_4(io->off));
 300                         c = ',';
 301                 }
 302                 ND_PRINT(">");
 303                 ps = (const struct pgstate *)io;
 304                 n--;
 305         }
 306         return 0;
 307 }
 308
 309 static void
 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                 t = GET_U_1(dh->dh_type);
 320
 321                 ND_PRINT(" %s", tok2str(dop_str, "dop-%u!", t));
 322                 if (t == DT_SKIP || t == DT_HOLE) {
 323                         uint32_t ts = GET_BE_U_4(dh->dh_ts);
 324                         ND_PRINT("%u", ts - ss + 1);
 325                         if (ss > ts || ts > es) {
 326                                 ND_PRINT("[|]");
 327                                 if (ts < ss)
 328                                         return;
 329                         }
 330                         ss = ts;
 331                 }
 332                 dh = DOP_NEXT(dh);
 333         }
 334         ND_PRINT(" >");
 335 }
 336
 337 static int
 338 wb_rrep(netdissect_options *ndo,
 339         const struct pkt_rrep *rrep, u_int len)
 340 {
 341         const struct pkt_dop *dop = &rrep->pr_dop;
 342
 343         ND_PRINT(" wb-rrep:");
 344         if (len < sizeof(*rrep))
 345                 return (-1);
 346         len -= sizeof(*rrep);
 347
 348         ND_PRINT(" for %s %s:%u<%u:%u>",
 349             GET_IPADDR_STRING(rrep->pr_id),
 350             GET_IPADDR_STRING(dop->pd_page.p_sid),
 351             GET_BE_U_4(dop->pd_page.p_uid),
 352             GET_BE_U_4(dop->pd_sseq),
 353             GET_BE_U_4(dop->pd_eseq));
 354
 355         if (ndo->ndo_vflag)
 356                 wb_dops(ndo, dop,
 357                         GET_BE_U_4(dop->pd_sseq),
 358                         GET_BE_U_4(dop->pd_eseq));
 359         return (0);
 360 }
 361
 362 static int
 363 wb_drawop(netdissect_options *ndo,
 364           const struct pkt_dop *dop, u_int len)
 365 {
 366         ND_PRINT(" wb-dop:");
 367         if (len < sizeof(*dop))
 368                 return (-1);
 369         len -= sizeof(*dop);
 370
 371         ND_PRINT(" %s:%u<%u:%u>",
 372             GET_IPADDR_STRING(dop->pd_page.p_sid),
 373             GET_BE_U_4(dop->pd_page.p_uid),
 374             GET_BE_U_4(dop->pd_sseq),
 375             GET_BE_U_4(dop->pd_eseq));
 376
 377         if (ndo->ndo_vflag)
 378                 wb_dops(ndo, dop,
 379                         GET_BE_U_4(dop->pd_sseq),
 380                         GET_BE_U_4(dop->pd_eseq));
 381         return (0);
 382 }
 383
 384 /*
 385  * Print whiteboard multicast packets.
 386  */
 387 void
 388 wb_print(netdissect_options *ndo,
 389          const u_char *hdr, u_int len)
 390 {
 391         const struct pkt_hdr *ph;
 392         uint8_t type;
 393         int print_result;
 394
 395         ndo->ndo_protocol = "wb";
 396         ph = (const struct pkt_hdr *)hdr;
 397         if (len < sizeof(*ph))
 398                 goto invalid;
 399         ND_TCHECK_SIZE(ph);
 400         len -= sizeof(*ph);
 401
 402         if (GET_U_1(ph->ph_flags))
 403                 ND_PRINT("*");
 404         type = GET_U_1(ph->ph_type);
 405         switch (type) {
 406
 407         case PT_KILL:
 408                 ND_PRINT(" wb-kill");
 409                 return;
 410
 411         case PT_ID:
 412                 print_result = wb_id(ndo, (const struct pkt_id *)(ph + 1), len);
 413                 break;
 414
 415         case PT_RREQ:
 416                 print_result = wb_rreq(ndo, (const struct pkt_rreq *)(ph + 1), len);
 417                 break;
 418
 419         case PT_RREP:
 420                 print_result = wb_rrep(ndo, (const struct pkt_rrep *)(ph + 1), len);
 421                 break;
 422
 423         case PT_DRAWOP:
 424                 print_result = wb_drawop(ndo, (const struct pkt_dop *)(ph + 1), len);
 425                 break;
 426
 427         case PT_PREQ:
 428                 print_result = wb_preq(ndo, (const struct pkt_preq *)(ph + 1), len);
 429                 break;
 430
 431         case PT_PREP:
 432                 print_result = wb_prep(ndo, (const struct pkt_prep *)(ph + 1), len);
 433                 break;
 434
 435         default:
 436                 ND_PRINT(" wb-%u!", type);
 437                 print_result = -1;
 438         }
 439         if (print_result < 0)
 440                 goto invalid;
 441         return;
 442
 443 invalid:
 444         nd_print_invalid(ndo);
 445 }