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