contrib/tcpdump/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 #ifndef lint
  22 static const char rcsid[] _U_ =
  23     "@(#) $Header: /tcpdump/master/tcpdump/print-egp.c,v 1.38 2006-02-11 22:13:24 hannes Exp $ (LBL)";
  24 #endif
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include <tcpdump-stdinc.h>
  31
  32 #include <stdio.h>
  33
  34 #include "interface.h"
  35 #include "addrtoname.h"
  36 #include "extract.h"
  37
  38 #include "ip.h"
  39
  40 struct egp_packet {
  41         u_int8_t  egp_version;
  42 #define EGP_VERSION     2
  43         u_int8_t  egp_type;
  44 #define  EGPT_ACQUIRE   3
  45 #define  EGPT_REACH     5
  46 #define  EGPT_POLL      2
  47 #define  EGPT_UPDATE    1
  48 #define  EGPT_ERROR     8
  49         u_int8_t  egp_code;
  50 #define  EGPC_REQUEST   0
  51 #define  EGPC_CONFIRM   1
  52 #define  EGPC_REFUSE    2
  53 #define  EGPC_CEASE     3
  54 #define  EGPC_CEASEACK  4
  55 #define  EGPC_HELLO     0
  56 #define  EGPC_HEARDU    1
  57         u_int8_t  egp_status;
  58 #define  EGPS_UNSPEC    0
  59 #define  EGPS_ACTIVE    1
  60 #define  EGPS_PASSIVE   2
  61 #define  EGPS_NORES     3
  62 #define  EGPS_ADMIN     4
  63 #define  EGPS_GODOWN    5
  64 #define  EGPS_PARAM     6
  65 #define  EGPS_PROTO     7
  66 #define  EGPS_INDET     0
  67 #define  EGPS_UP        1
  68 #define  EGPS_DOWN      2
  69 #define  EGPS_UNSOL     0x80
  70         u_int16_t  egp_checksum;
  71         u_int16_t  egp_as;
  72         u_int16_t  egp_sequence;
  73         union {
  74                 u_int16_t  egpu_hello;
  75                 u_int8_t egpu_gws[2];
  76                 u_int16_t  egpu_reason;
  77 #define  EGPR_UNSPEC    0
  78 #define  EGPR_BADHEAD   1
  79 #define  EGPR_BADDATA   2
  80 #define  EGPR_NOREACH   3
  81 #define  EGPR_XSPOLL    4
  82 #define  EGPR_NORESP    5
  83 #define  EGPR_UVERSION  6
  84         } egp_handg;
  85 #define  egp_hello  egp_handg.egpu_hello
  86 #define  egp_intgw  egp_handg.egpu_gws[0]
  87 #define  egp_extgw  egp_handg.egpu_gws[1]
  88 #define  egp_reason  egp_handg.egpu_reason
  89         union {
  90                 u_int16_t  egpu_poll;
  91                 u_int32_t egpu_sourcenet;
  92         } egp_pands;
  93 #define  egp_poll  egp_pands.egpu_poll
  94 #define  egp_sourcenet  egp_pands.egpu_sourcenet
  95 };
  96
  97 const char *egp_acquire_codes[] = {
  98         "request",
  99         "confirm",
 100         "refuse",
 101         "cease",
 102         "cease_ack"
 103 };
 104
 105 const char *egp_acquire_status[] = {
 106         "unspecified",
 107         "active_mode",
 108         "passive_mode",
 109         "insufficient_resources",
 110         "administratively_prohibited",
 111         "going_down",
 112         "parameter_violation",
 113         "protocol_violation"
 114 };
 115
 116 const char *egp_reach_codes[] = {
 117         "hello",
 118         "i-h-u"
 119 };
 120
 121 const char *egp_status_updown[] = {
 122         "indeterminate",
 123         "up",
 124         "down"
 125 };
 126
 127 const char *egp_reasons[] = {
 128         "unspecified",
 129         "bad_EGP_header_format",
 130         "bad_EGP_data_field_format",
 131         "reachability_info_unavailable",
 132         "excessive_polling_rate",
 133         "no_response",
 134         "unsupported_version"
 135 };
 136
 137 static void
 138 egpnrprint(register const struct egp_packet *egp)
 139 {
 140         register const u_int8_t *cp;
 141         u_int32_t addr;
 142         register u_int32_t net;
 143         register u_int netlen;
 144         int gateways, distances, networks;
 145         int t_gateways;
 146         const char *comma;
 147
 148         addr = egp->egp_sourcenet;
 149         if (IN_CLASSA(addr)) {
 150                 net = addr & IN_CLASSA_NET;
 151                 netlen = 1;
 152         } else if (IN_CLASSB(addr)) {
 153                 net = addr & IN_CLASSB_NET;
 154                 netlen = 2;
 155         } else if (IN_CLASSC(addr)) {
 156                 net = addr & IN_CLASSC_NET;
 157                 netlen = 3;
 158         } else {
 159                 net = 0;
 160                 netlen = 0;
 161         }
 162         cp = (u_int8_t *)(egp + 1);
 163
 164         t_gateways = egp->egp_intgw + egp->egp_extgw;
 165         for (gateways = 0; gateways < t_gateways; ++gateways) {
 166                 /* Pickup host part of gateway address */
 167                 addr = 0;
 168                 TCHECK2(cp[0], 4 - netlen);
 169                 switch (netlen) {
 170
 171                 case 1:
 172                         addr = *cp++;
 173                         /* fall through */
 174                 case 2:
 175                         addr = (addr << 8) | *cp++;
 176                         /* fall through */
 177                 case 3:
 178                         addr = (addr << 8) | *cp++;
 179                 }
 180                 addr |= net;
 181                 TCHECK2(cp[0], 1);
 182                 distances = *cp++;
 183                 printf(" %s %s ",
 184                        gateways < (int)egp->egp_intgw ? "int" : "ext",
 185                        ipaddr_string(&addr));
 186
 187                 comma = "";
 188                 putchar('(');
 189                 while (--distances >= 0) {
 190                         TCHECK2(cp[0], 2);
 191                         printf("%sd%d:", comma, (int)*cp++);
 192                         comma = ", ";
 193                         networks = *cp++;
 194                         while (--networks >= 0) {
 195                                 /* Pickup network number */
 196                                 TCHECK2(cp[0], 1);
 197                                 addr = (u_int32_t)*cp++ << 24;
 198                                 if (IN_CLASSB(addr)) {
 199                                         TCHECK2(cp[0], 1);
 200                                         addr |= (u_int32_t)*cp++ << 16;
 201                                 } else if (!IN_CLASSA(addr)) {
 202                                         TCHECK2(cp[0], 2);
 203                                         addr |= (u_int32_t)*cp++ << 16;
 204                                         addr |= (u_int32_t)*cp++ << 8;
 205                                 }
 206                                 printf(" %s", ipaddr_string(&addr));
 207                         }
 208                 }
 209                 putchar(')');
 210         }
 211         return;
 212 trunc:
 213         fputs("[|]", stdout);
 214 }
 215
 216 void
 217 egp_print(register const u_int8_t *bp, register u_int length)
 218 {
 219         register const struct egp_packet *egp;
 220         register int status;
 221         register int code;
 222         register int type;
 223
 224         egp = (struct egp_packet *)bp;
 225         if (!TTEST2(*egp, length)) {
 226                 printf("[|egp]");
 227                 return;
 228         }
 229
 230         if (!vflag) {
 231             printf("EGPv%u, AS %u, seq %u, length %u",
 232                    egp->egp_version,
 233                    EXTRACT_16BITS(&egp->egp_as),
 234                    EXTRACT_16BITS(&egp->egp_sequence),
 235                    length);
 236             return;
 237         } else
 238             printf("EGPv%u, length %u",
 239                    egp->egp_version,
 240                    length);
 241
 242         if (egp->egp_version != EGP_VERSION) {
 243                 printf("[version %d]", egp->egp_version);
 244                 return;
 245         }
 246
 247         type = egp->egp_type;
 248         code = egp->egp_code;
 249         status = egp->egp_status;
 250
 251         switch (type) {
 252         case EGPT_ACQUIRE:
 253                 printf(" acquire");
 254                 switch (code) {
 255                 case EGPC_REQUEST:
 256                 case EGPC_CONFIRM:
 257                         printf(" %s", egp_acquire_codes[code]);
 258                         switch (status) {
 259                         case EGPS_UNSPEC:
 260                         case EGPS_ACTIVE:
 261                         case EGPS_PASSIVE:
 262                                 printf(" %s", egp_acquire_status[status]);
 263                                 break;
 264
 265                         default:
 266                                 printf(" [status %d]", status);
 267                                 break;
 268                         }
 269                         printf(" hello:%d poll:%d",
 270                                EXTRACT_16BITS(&egp->egp_hello),
 271                                EXTRACT_16BITS(&egp->egp_poll));
 272                         break;
 273
 274                 case EGPC_REFUSE:
 275                 case EGPC_CEASE:
 276                 case EGPC_CEASEACK:
 277                         printf(" %s", egp_acquire_codes[code]);
 278                         switch (status ) {
 279                         case EGPS_UNSPEC:
 280                         case EGPS_NORES:
 281                         case EGPS_ADMIN:
 282                         case EGPS_GODOWN:
 283                         case EGPS_PARAM:
 284                         case EGPS_PROTO:
 285                                 printf(" %s", egp_acquire_status[status]);
 286                                 break;
 287
 288                         default:
 289                                 printf("[status %d]", status);
 290                                 break;
 291                         }
 292                         break;
 293
 294                 default:
 295                         printf("[code %d]", code);
 296                         break;
 297                 }
 298                 break;
 299
 300         case EGPT_REACH:
 301                 switch (code) {
 302
 303                 case EGPC_HELLO:
 304                 case EGPC_HEARDU:
 305                         printf(" %s", egp_reach_codes[code]);
 306                         if (status <= EGPS_DOWN)
 307                                 printf(" state:%s", egp_status_updown[status]);
 308                         else
 309                                 printf(" [status %d]", status);
 310                         break;
 311
 312                 default:
 313                         printf("[reach code %d]", code);
 314                         break;
 315                 }
 316                 break;
 317
 318         case EGPT_POLL:
 319                 printf(" poll");
 320                 if (egp->egp_status <= EGPS_DOWN)
 321                         printf(" state:%s", egp_status_updown[status]);
 322                 else
 323                         printf(" [status %d]", status);
 324                 printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
 325                 break;
 326
 327         case EGPT_UPDATE:
 328                 printf(" update");
 329                 if (status & EGPS_UNSOL) {
 330                         status &= ~EGPS_UNSOL;
 331                         printf(" unsolicited");
 332                 }
 333                 if (status <= EGPS_DOWN)
 334                         printf(" state:%s", egp_status_updown[status]);
 335                 else
 336                         printf(" [status %d]", status);
 337                 printf(" %s int %d ext %d",
 338                        ipaddr_string(&egp->egp_sourcenet),
 339                        egp->egp_intgw,
 340                        egp->egp_extgw);
 341                 if (vflag)
 342                         egpnrprint(egp);
 343                 break;
 344
 345         case EGPT_ERROR:
 346                 printf(" error");
 347                 if (status <= EGPS_DOWN)
 348                         printf(" state:%s", egp_status_updown[status]);
 349                 else
 350                         printf(" [status %d]", status);
 351
 352                 if (EXTRACT_16BITS(&egp->egp_reason) <= EGPR_UVERSION)
 353                         printf(" %s", egp_reasons[EXTRACT_16BITS(&egp->egp_reason)]);
 354                 else
 355                         printf(" [reason %d]", EXTRACT_16BITS(&egp->egp_reason));
 356                 break;
 357
 358         default:
 359                 printf("[type %d]", type);
 360                 break;
 361         }
 362 }