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