external/bsd/tcpdump/dist/print-egp.c

   1 /*
   2  * Copyright (c) 1991, 1992, 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 are permitted
   6  * provided that the above copyright notice and this paragraph are
   7  * duplicated in all such forms and that any documentation,
   8  * advertising materials, and other materials related to such
   9  * distribution and use acknowledge that the software was developed
  10  * by the University of California, Lawrence Berkeley Laboratory,
  11  * Berkeley, CA.  The name of the University may not be used to
  12  * endorse or promote products derived from this software without
  13  * specific prior written permission.
  14  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  17  *
  18  * Initial contribution from Jeff Honig (jch@MITCHELL.CIT.CORNELL.EDU).
  19  */
  20
  21 #include <sys/cdefs.h>
  22 #ifndef lint
  23 __RCSID("$NetBSD: print-egp.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
  24 #endif
  25
  26 #define NETDISSECT_REWORKED
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include "interface.h"
  34 #include "addrtoname.h"
  35 #include "extract.h"
  36
  37 struct egp_packet {
  38         uint8_t  egp_version;
  39 #define EGP_VERSION     2
  40         uint8_t  egp_type;
  41 #define  EGPT_ACQUIRE   3
  42 #define  EGPT_REACH     5
  43 #define  EGPT_POLL      2
  44 #define  EGPT_UPDATE    1
  45 #define  EGPT_ERROR     8
  46         uint8_t  egp_code;
  47 #define  EGPC_REQUEST   0
  48 #define  EGPC_CONFIRM   1
  49 #define  EGPC_REFUSE    2
  50 #define  EGPC_CEASE     3
  51 #define  EGPC_CEASEACK  4
  52 #define  EGPC_HELLO     0
  53 #define  EGPC_HEARDU    1
  54         uint8_t  egp_status;
  55 #define  EGPS_UNSPEC    0
  56 #define  EGPS_ACTIVE    1
  57 #define  EGPS_PASSIVE   2
  58 #define  EGPS_NORES     3
  59 #define  EGPS_ADMIN     4
  60 #define  EGPS_GODOWN    5
  61 #define  EGPS_PARAM     6
  62 #define  EGPS_PROTO     7
  63 #define  EGPS_INDET     0
  64 #define  EGPS_UP        1
  65 #define  EGPS_DOWN      2
  66 #define  EGPS_UNSOL     0x80
  67         uint16_t  egp_checksum;
  68         uint16_t  egp_as;
  69         uint16_t  egp_sequence;
  70         union {
  71                 uint16_t  egpu_hello;
  72                 uint8_t egpu_gws[2];
  73                 uint16_t  egpu_reason;
  74 #define  EGPR_UNSPEC    0
  75 #define  EGPR_BADHEAD   1
  76 #define  EGPR_BADDATA   2
  77 #define  EGPR_NOREACH   3
  78 #define  EGPR_XSPOLL    4
  79 #define  EGPR_NORESP    5
  80 #define  EGPR_UVERSION  6
  81         } egp_handg;
  82 #define  egp_hello  egp_handg.egpu_hello
  83 #define  egp_intgw  egp_handg.egpu_gws[0]
  84 #define  egp_extgw  egp_handg.egpu_gws[1]
  85 #define  egp_reason  egp_handg.egpu_reason
  86         union {
  87                 uint16_t  egpu_poll;
  88                 uint32_t egpu_sourcenet;
  89         } egp_pands;
  90 #define  egp_poll  egp_pands.egpu_poll
  91 #define  egp_sourcenet  egp_pands.egpu_sourcenet
  92 };
  93
  94 static const char *egp_acquire_codes[] = {
  95         "request",
  96         "confirm",
  97         "refuse",
  98         "cease",
  99         "cease_ack"
 100 };
 101
 102 static const char *egp_acquire_status[] = {
 103         "unspecified",
 104         "active_mode",
 105         "passive_mode",
 106         "insufficient_resources",
 107         "administratively_prohibited",
 108         "going_down",
 109         "parameter_violation",
 110         "protocol_violation"
 111 };
 112
 113 static const char *egp_reach_codes[] = {
 114         "hello",
 115         "i-h-u"
 116 };
 117
 118 static const char *egp_status_updown[] = {
 119         "indeterminate",
 120         "up",
 121         "down"
 122 };
 123
 124 static const char *egp_reasons[] = {
 125         "unspecified",
 126         "bad_EGP_header_format",
 127         "bad_EGP_data_field_format",
 128         "reachability_info_unavailable",
 129         "excessive_polling_rate",
 130         "no_response",
 131         "unsupported_version"
 132 };
 133
 134 static void
 135 egpnrprint(netdissect_options *ndo,
 136            register const struct egp_packet *egp)
 137 {
 138         register const uint8_t *cp;
 139         uint32_t addr;
 140         register uint32_t net;
 141         register u_int netlen;
 142         int gateways, distances, networks;
 143         int t_gateways;
 144         const char *comma;
 145
 146         addr = egp->egp_sourcenet;
 147         if (IN_CLASSA(addr)) {
 148                 net = addr & IN_CLASSA_NET;
 149                 netlen = 1;
 150         } else if (IN_CLASSB(addr)) {
 151                 net = addr & IN_CLASSB_NET;
 152                 netlen = 2;
 153         } else if (IN_CLASSC(addr)) {
 154                 net = addr & IN_CLASSC_NET;
 155                 netlen = 3;
 156         } else {
 157                 net = 0;
 158                 netlen = 0;
 159         }
 160         cp = (uint8_t *)(egp + 1);
 161
 162         t_gateways = egp->egp_intgw + egp->egp_extgw;
 163         for (gateways = 0; gateways < t_gateways; ++gateways) {
 164                 /* Pickup host part of gateway address */
 165                 addr = 0;
 166                 ND_TCHECK2(cp[0], 4 - netlen);
 167                 switch (netlen) {
 168
 169                 case 1:
 170                         addr = *cp++;
 171                         /* fall through */
 172                 case 2:
 173                         addr = (addr << 8) | *cp++;
 174                         /* fall through */
 175                 case 3:
 176                         addr = (addr << 8) | *cp++;
 177                 }
 178                 addr |= net;
 179                 ND_TCHECK2(cp[0], 1);
 180                 distances = *cp++;
 181                 ND_PRINT((ndo, " %s %s ",
 182                        gateways < (int)egp->egp_intgw ? "int" : "ext",
 183                        ipaddr_string(ndo, &addr)));
 184
 185                 comma = "";
 186                 ND_PRINT((ndo, "("));
 187                 while (--distances >= 0) {
 188                         ND_TCHECK2(cp[0], 2);
 189                         ND_PRINT((ndo, "%sd%d:", comma, (int)*cp++));
 190                         comma = ", ";
 191                         networks = *cp++;
 192                         while (--networks >= 0) {
 193                                 /* Pickup network number */
 194                                 ND_TCHECK2(cp[0], 1);
 195                                 addr = (uint32_t)*cp++ << 24;
 196                                 if (IN_CLASSB(addr)) {
 197                                         ND_TCHECK2(cp[0], 1);
 198                                         addr |= (uint32_t)*cp++ << 16;
 199                                 } else if (!IN_CLASSA(addr)) {
 200                                         ND_TCHECK2(cp[0], 2);
 201                                         addr |= (uint32_t)*cp++ << 16;
 202                                         addr |= (uint32_t)*cp++ << 8;
 203                                 }
 204                                 ND_PRINT((ndo, " %s", ipaddr_string(ndo, &addr)));
 205                         }
 206                 }
 207                 ND_PRINT((ndo, ")"));
 208         }
 209         return;
 210 trunc:
 211         ND_PRINT((ndo, "[|]"));
 212 }
 213
 214 void
 215 egp_print(netdissect_options *ndo,
 216           register const uint8_t *bp, register u_int length)
 217 {
 218         register const struct egp_packet *egp;
 219         register int status;
 220         register int code;
 221         register int type;
 222
 223         egp = (struct egp_packet *)bp;
 224         if (!ND_TTEST2(*egp, length)) {
 225                 ND_PRINT((ndo, "[|egp]"));
 226                 return;
 227         }
 228
 229         if (!ndo->ndo_vflag) {
 230             ND_PRINT((ndo, "EGPv%u, AS %u, seq %u, length %u",
 231                    egp->egp_version,
 232                    EXTRACT_16BITS(&egp->egp_as),
 233                    EXTRACT_16BITS(&egp->egp_sequence),
 234                    length));
 235             return;
 236         } else
 237             ND_PRINT((ndo, "EGPv%u, length %u",
 238                    egp->egp_version,
 239                    length));
 240
 241         if (egp->egp_version != EGP_VERSION) {
 242                 ND_PRINT((ndo, "[version %d]", egp->egp_version));
 243                 return;
 244         }
 245
 246         type = egp->egp_type;
 247         code = egp->egp_code;
 248         status = egp->egp_status;
 249
 250         switch (type) {
 251         case EGPT_ACQUIRE:
 252                 ND_PRINT((ndo, " acquire"));
 253                 switch (code) {
 254                 case EGPC_REQUEST:
 255                 case EGPC_CONFIRM:
 256                         ND_PRINT((ndo, " %s", egp_acquire_codes[code]));
 257                         switch (status) {
 258                         case EGPS_UNSPEC:
 259                         case EGPS_ACTIVE:
 260                         case EGPS_PASSIVE:
 261                                 ND_PRINT((ndo, " %s", egp_acquire_status[status]));
 262                                 break;
 263
 264                         default:
 265                                 ND_PRINT((ndo, " [status %d]", status));
 266                                 break;
 267                         }
 268                         ND_PRINT((ndo, " hello:%d poll:%d",
 269                                EXTRACT_16BITS(&egp->egp_hello),
 270                                EXTRACT_16BITS(&egp->egp_poll)));
 271                         break;
 272
 273                 case EGPC_REFUSE:
 274                 case EGPC_CEASE:
 275                 case EGPC_CEASEACK:
 276                         ND_PRINT((ndo, " %s", egp_acquire_codes[code]));
 277                         switch (status ) {
 278                         case EGPS_UNSPEC:
 279                         case EGPS_NORES:
 280                         case EGPS_ADMIN:
 281                         case EGPS_GODOWN:
 282                         case EGPS_PARAM:
 283                         case EGPS_PROTO:
 284                                 ND_PRINT((ndo, " %s", egp_acquire_status[status]));
 285                                 break;
 286
 287                         default:
 288                                 ND_PRINT((ndo, "[status %d]", status));
 289                                 break;
 290                         }
 291                         break;
 292
 293                 default:
 294                         ND_PRINT((ndo, "[code %d]", code));
 295                         break;
 296                 }
 297                 break;
 298
 299         case EGPT_REACH:
 300                 switch (code) {
 301
 302                 case EGPC_HELLO:
 303                 case EGPC_HEARDU:
 304                         ND_PRINT((ndo, " %s", egp_reach_codes[code]));
 305                         if (status <= EGPS_DOWN)
 306                                 ND_PRINT((ndo, " state:%s", egp_status_updown[status]));
 307                         else
 308                                 ND_PRINT((ndo, " [status %d]", status));
 309                         break;
 310
 311                 default:
 312                         ND_PRINT((ndo, "[reach code %d]", code));
 313                         break;
 314                 }
 315                 break;
 316
 317         case EGPT_POLL:
 318                 ND_PRINT((ndo, " poll"));
 319                 if (egp->egp_status <= EGPS_DOWN)
 320                         ND_PRINT((ndo, " state:%s", egp_status_updown[status]));
 321                 else
 322                         ND_PRINT((ndo, " [status %d]", status));
 323                 ND_PRINT((ndo, " net:%s", ipaddr_string(ndo, &egp->egp_sourcenet)));
 324                 break;
 325
 326         case EGPT_UPDATE:
 327                 ND_PRINT((ndo, " update"));
 328                 if (status & EGPS_UNSOL) {
 329                         status &= ~EGPS_UNSOL;
 330                         ND_PRINT((ndo, " unsolicited"));
 331                 }
 332                 if (status <= EGPS_DOWN)
 333                         ND_PRINT((ndo, " state:%s", egp_status_updown[status]));
 334                 else
 335                         ND_PRINT((ndo, " [status %d]", status));
 336                 ND_PRINT((ndo, " %s int %d ext %d",
 337                        ipaddr_string(ndo, &egp->egp_sourcenet),
 338                        egp->egp_intgw,
 339                        egp->egp_extgw));
 340                 if (ndo->ndo_vflag)
 341                         egpnrprint(ndo, egp);
 342                 break;
 343
 344         case EGPT_ERROR:
 345                 ND_PRINT((ndo, " error"));
 346                 if (status <= EGPS_DOWN)
 347                         ND_PRINT((ndo, " state:%s", egp_status_updown[status]));
 348                 else
 349                         ND_PRINT((ndo, " [status %d]", status));
 350
 351                 if (EXTRACT_16BITS(&egp->egp_reason) <= EGPR_UVERSION)
 352                         ND_PRINT((ndo, " %s", egp_reasons[EXTRACT_16BITS(&egp->egp_reason)]));
 353                 else
 354                         ND_PRINT((ndo, " [reason %d]", EXTRACT_16BITS(&egp->egp_reason)));
 355                 break;
 356
 357         default:
 358                 ND_PRINT((ndo, "[type %d]", type));
 359                 break;
 360         }
 361 }