dist/tcpdump/print-egp.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms are permitted
   8  * provided that the above copyright notice and this paragraph are
   9  * duplicated in all such forms and that any documentation,
  10  * advertising materials, and other materials related to such
  11  * distribution and use acknowledge that the software was developed
  12  * by the University of California, Lawrence Berkeley Laboratory,
  13  * Berkeley, CA.  The name of the University may not be used to
  14  * endorse or promote products derived from this software without
  15  * specific prior written permission.
  16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  19  *
  20  * Initial contribution from Jeff Honig (jch@MITCHELL.CIT.CORNELL.EDU).
  21  */
  22
  23 #include <sys/cdefs.h>
  24 #ifndef lint
  25 #if 0
  26 static const char rcsid[] _U_ =
  27     "@(#) Header: /tcpdump/master/tcpdump/print-egp.c,v 1.37 2005/01/12 11:19:09 hannes Exp (LBL)";
  28 #else
  29 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  30 #endif
  31 #endif
  32
  33 #ifdef HAVE_CONFIG_H
  34 #include "config.h"
  35 #endif
  36
  37 #include <tcpdump-stdinc.h>
  38
  39 #include <stdio.h>
  40
  41 #include "interface.h"
  42 #include "addrtoname.h"
  43 #include "extract.h"
  44
  45 #include "ip.h"
  46
  47 struct egp_packet {
  48         u_int8_t  egp_version;
  49 #define EGP_VERSION     2
  50         u_int8_t  egp_type;
  51 #define  EGPT_ACQUIRE   3
  52 #define  EGPT_REACH     5
  53 #define  EGPT_POLL      2
  54 #define  EGPT_UPDATE    1
  55 #define  EGPT_ERROR     8
  56         u_int8_t  egp_code;
  57 #define  EGPC_REQUEST   0
  58 #define  EGPC_CONFIRM   1
  59 #define  EGPC_REFUSE    2
  60 #define  EGPC_CEASE     3
  61 #define  EGPC_CEASEACK  4
  62 #define  EGPC_HELLO     0
  63 #define  EGPC_HEARDU    1
  64         u_int8_t  egp_status;
  65 #define  EGPS_UNSPEC    0
  66 #define  EGPS_ACTIVE    1
  67 #define  EGPS_PASSIVE   2
  68 #define  EGPS_NORES     3
  69 #define  EGPS_ADMIN     4
  70 #define  EGPS_GODOWN    5
  71 #define  EGPS_PARAM     6
  72 #define  EGPS_PROTO     7
  73 #define  EGPS_INDET     0
  74 #define  EGPS_UP        1
  75 #define  EGPS_DOWN      2
  76 #define  EGPS_UNSOL     0x80
  77         u_int16_t  egp_checksum;
  78         u_int16_t  egp_as;
  79         u_int16_t  egp_sequence;
  80         union {
  81                 u_int16_t  egpu_hello;
  82                 u_int8_t egpu_gws[2];
  83                 u_int16_t  egpu_reason;
  84 #define  EGPR_UNSPEC    0
  85 #define  EGPR_BADHEAD   1
  86 #define  EGPR_BADDATA   2
  87 #define  EGPR_NOREACH   3
  88 #define  EGPR_XSPOLL    4
  89 #define  EGPR_NORESP    5
  90 #define  EGPR_UVERSION  6
  91         } egp_handg;
  92 #define  egp_hello  egp_handg.egpu_hello
  93 #define  egp_intgw  egp_handg.egpu_gws[0]
  94 #define  egp_extgw  egp_handg.egpu_gws[1]
  95 #define  egp_reason  egp_handg.egpu_reason
  96         union {
  97                 u_int16_t  egpu_poll;
  98                 u_int32_t egpu_sourcenet;
  99         } egp_pands;
 100 #define  egp_poll  egp_pands.egpu_poll
 101 #define  egp_sourcenet  egp_pands.egpu_sourcenet
 102 };
 103
 104 const char *egp_acquire_codes[] = {
 105         "request",
 106         "confirm",
 107         "refuse",
 108         "cease",
 109         "cease_ack"
 110 };
 111
 112 const char *egp_acquire_status[] = {
 113         "unspecified",
 114         "active_mode",
 115         "passive_mode",
 116         "insufficient_resources",
 117         "administratively_prohibited",
 118         "going_down",
 119         "parameter_violation",
 120         "protocol_violation"
 121 };
 122
 123 const char *egp_reach_codes[] = {
 124         "hello",
 125         "i-h-u"
 126 };
 127
 128 const char *egp_status_updown[] = {
 129         "indeterminate",
 130         "up",
 131         "down"
 132 };
 133
 134 const char *egp_reasons[] = {
 135         "unspecified",
 136         "bad_EGP_header_format",
 137         "bad_EGP_data_field_format",
 138         "reachability_info_unavailable",
 139         "excessive_polling_rate",
 140         "no_response",
 141         "unsupported_version"
 142 };
 143
 144 static void
 145 egpnrprint(register const struct egp_packet *egp)
 146 {
 147         register const u_int8_t *cp;
 148         u_int32_t addr;
 149         register u_int32_t net;
 150         register u_int netlen;
 151         int gateways, distances, networks;
 152         int t_gateways;
 153         const char *comma;
 154
 155         addr = egp->egp_sourcenet;
 156         if (IN_CLASSA(addr)) {
 157                 net = addr & IN_CLASSA_NET;
 158                 netlen = 1;
 159         } else if (IN_CLASSB(addr)) {
 160                 net = addr & IN_CLASSB_NET;
 161                 netlen = 2;
 162         } else if (IN_CLASSC(addr)) {
 163                 net = addr & IN_CLASSC_NET;
 164                 netlen = 3;
 165         } else {
 166                 net = 0;
 167                 netlen = 0;
 168         }
 169         cp = (u_int8_t *)(egp + 1);
 170
 171         t_gateways = egp->egp_intgw + egp->egp_extgw;
 172         for (gateways = 0; gateways < t_gateways; ++gateways) {
 173                 /* Pickup host part of gateway address */
 174                 addr = 0;
 175                 TCHECK2(cp[0], 4 - netlen);
 176                 switch (netlen) {
 177
 178                 case 1:
 179                         addr = *cp++;
 180                         /* fall through */
 181                 case 2:
 182                         addr = (addr << 8) | *cp++;
 183                         /* fall through */
 184                 case 3:
 185                         addr = (addr << 8) | *cp++;
 186                 }
 187                 addr |= net;
 188                 TCHECK2(cp[0], 1);
 189                 distances = *cp++;
 190                 printf(" %s %s ",
 191                        gateways < (int)egp->egp_intgw ? "int" : "ext",
 192                        ipaddr_string(&addr));
 193
 194                 comma = "";
 195                 putchar('(');
 196                 while (--distances >= 0) {
 197                         TCHECK2(cp[0], 2);
 198                         printf("%sd%d:", comma, (int)*cp++);
 199                         comma = ", ";
 200                         networks = *cp++;
 201                         while (--networks >= 0) {
 202                                 /* Pickup network number */
 203                                 TCHECK2(cp[0], 1);
 204                                 addr = (u_int32_t)*cp++ << 24;
 205                                 if (IN_CLASSB(addr)) {
 206                                         TCHECK2(cp[0], 1);
 207                                         addr |= (u_int32_t)*cp++ << 16;
 208                                 } else if (!IN_CLASSA(addr)) {
 209                                         TCHECK2(cp[0], 2);
 210                                         addr |= (u_int32_t)*cp++ << 16;
 211                                         addr |= (u_int32_t)*cp++ << 8;
 212                                 }
 213                                 printf(" %s", ipaddr_string(&addr));
 214                         }
 215                 }
 216                 putchar(')');
 217         }
 218         return;
 219 trunc:
 220         fputs("[|]", stdout);
 221 }
 222
 223 void
 224 egp_print(register const u_int8_t *bp, register u_int length)
 225 {
 226         register const struct egp_packet *egp;
 227         register int status;
 228         register int code;
 229         register int type;
 230
 231         egp = (struct egp_packet *)bp;
 232         if (!TTEST2(*egp, length)) {
 233                 printf("[|egp]");
 234                 return;
 235         }
 236         (void)printf("egp: ");
 237
 238         if (egp->egp_version != EGP_VERSION) {
 239                 printf("[version %d]", egp->egp_version);
 240                 return;
 241         }
 242         printf("as:%d seq:%d", EXTRACT_16BITS(&egp->egp_as), EXTRACT_16BITS(&egp->egp_sequence));
 243
 244         type = egp->egp_type;
 245         code = egp->egp_code;
 246         status = egp->egp_status;
 247
 248         switch (type) {
 249         case EGPT_ACQUIRE:
 250                 printf(" acquire");
 251                 switch (code) {
 252                 case EGPC_REQUEST:
 253                 case EGPC_CONFIRM:
 254                         printf(" %s", egp_acquire_codes[code]);
 255                         switch (status) {
 256                         case EGPS_UNSPEC:
 257                         case EGPS_ACTIVE:
 258                         case EGPS_PASSIVE:
 259                                 printf(" %s", egp_acquire_status[status]);
 260                                 break;
 261
 262                         default:
 263                                 printf(" [status %d]", status);
 264                                 break;
 265                         }
 266                         printf(" hello:%d poll:%d",
 267                                EXTRACT_16BITS(&egp->egp_hello),
 268                                EXTRACT_16BITS(&egp->egp_poll));
 269                         break;
 270
 271                 case EGPC_REFUSE:
 272                 case EGPC_CEASE:
 273                 case EGPC_CEASEACK:
 274                         printf(" %s", egp_acquire_codes[code]);
 275                         switch (status ) {
 276                         case EGPS_UNSPEC:
 277                         case EGPS_NORES:
 278                         case EGPS_ADMIN:
 279                         case EGPS_GODOWN:
 280                         case EGPS_PARAM:
 281                         case EGPS_PROTO:
 282                                 printf(" %s", egp_acquire_status[status]);
 283                                 break;
 284
 285                         default:
 286                                 printf("[status %d]", status);
 287                                 break;
 288                         }
 289                         break;
 290
 291                 default:
 292                         printf("[code %d]", code);
 293                         break;
 294                 }
 295                 break;
 296
 297         case EGPT_REACH:
 298                 switch (code) {
 299
 300                 case EGPC_HELLO:
 301                 case EGPC_HEARDU:
 302                         printf(" %s", egp_reach_codes[code]);
 303                         if (status <= EGPS_DOWN)
 304                                 printf(" state:%s", egp_status_updown[status]);
 305                         else
 306                                 printf(" [status %d]", status);
 307                         break;
 308
 309                 default:
 310                         printf("[reach code %d]", code);
 311                         break;
 312                 }
 313                 break;
 314
 315         case EGPT_POLL:
 316                 printf(" poll");
 317                 if (egp->egp_status <= EGPS_DOWN)
 318                         printf(" state:%s", egp_status_updown[status]);
 319                 else
 320                         printf(" [status %d]", status);
 321                 printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
 322                 break;
 323
 324         case EGPT_UPDATE:
 325                 printf(" update");
 326                 if (status & EGPS_UNSOL) {
 327                         status &= ~EGPS_UNSOL;
 328                         printf(" unsolicited");
 329                 }
 330                 if (status <= EGPS_DOWN)
 331                         printf(" state:%s", egp_status_updown[status]);
 332                 else
 333                         printf(" [status %d]", status);
 334                 printf(" %s int %d ext %d",
 335                        ipaddr_string(&egp->egp_sourcenet),
 336                        egp->egp_intgw,
 337                        egp->egp_extgw);
 338                 if (vflag)
 339                         egpnrprint(egp);
 340                 break;
 341
 342         case EGPT_ERROR:
 343                 printf(" error");
 344                 if (status <= EGPS_DOWN)
 345                         printf(" state:%s", egp_status_updown[status]);
 346                 else
 347                         printf(" [status %d]", status);
 348
 349                 if (EXTRACT_16BITS(&egp->egp_reason) <= EGPR_UVERSION)
 350                         printf(" %s", egp_reasons[EXTRACT_16BITS(&egp->egp_reason)]);
 351                 else
 352                         printf(" [reason %d]", EXTRACT_16BITS(&egp->egp_reason));
 353                 break;
 354
 355         default:
 356                 printf("[type %d]", type);
 357                 break;
 358         }
 359 }