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 #ifndef lint
  22 static const char rcsid[] =
  23     "@(#) $Header: /tcpdump/master/tcpdump/print-egp.c,v 1.31 2002-09-05 00:00:12 guy 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
  37 #include "ip.h"
  38
  39 struct egp_packet {
  40         u_char  egp_version;
  41 #define EGP_VERSION     2
  42         u_char  egp_type;
  43 #define  EGPT_ACQUIRE   3
  44 #define  EGPT_REACH     5
  45 #define  EGPT_POLL      2
  46 #define  EGPT_UPDATE    1
  47 #define  EGPT_ERROR     8
  48         u_char  egp_code;
  49 #define  EGPC_REQUEST   0
  50 #define  EGPC_CONFIRM   1
  51 #define  EGPC_REFUSE    2
  52 #define  EGPC_CEASE     3
  53 #define  EGPC_CEASEACK  4
  54 #define  EGPC_HELLO     0
  55 #define  EGPC_HEARDU    1
  56         u_char  egp_status;
  57 #define  EGPS_UNSPEC    0
  58 #define  EGPS_ACTIVE    1
  59 #define  EGPS_PASSIVE   2
  60 #define  EGPS_NORES     3
  61 #define  EGPS_ADMIN     4
  62 #define  EGPS_GODOWN    5
  63 #define  EGPS_PARAM     6
  64 #define  EGPS_PROTO     7
  65 #define  EGPS_INDET     0
  66 #define  EGPS_UP        1
  67 #define  EGPS_DOWN      2
  68 #define  EGPS_UNSOL     0x80
  69         u_short  egp_checksum;
  70         u_short  egp_as;
  71         u_short  egp_sequence;
  72         union {
  73                 u_short  egpu_hello;
  74                 u_char egpu_gws[2];
  75                 u_short  egpu_reason;
  76 #define  EGPR_UNSPEC    0
  77 #define  EGPR_BADHEAD   1
  78 #define  EGPR_BADDATA   2
  79 #define  EGPR_NOREACH   3
  80 #define  EGPR_XSPOLL    4
  81 #define  EGPR_NORESP    5
  82 #define  EGPR_UVERSION  6
  83         } egp_handg;
  84 #define  egp_hello  egp_handg.egpu_hello
  85 #define  egp_intgw  egp_handg.egpu_gws[0]
  86 #define  egp_extgw  egp_handg.egpu_gws[1]
  87 #define  egp_reason  egp_handg.egpu_reason
  88         union {
  89                 u_short  egpu_poll;
  90                 u_int32_t egpu_sourcenet;
  91         } egp_pands;
  92 #define  egp_poll  egp_pands.egpu_poll
  93 #define  egp_sourcenet  egp_pands.egpu_sourcenet
  94 };
  95
  96 const char *egp_acquire_codes[] = {
  97         "request",
  98         "confirm",
  99         "refuse",
 100         "cease",
 101         "cease_ack"
 102 };
 103
 104 const char *egp_acquire_status[] = {
 105         "unspecified",
 106         "active_mode",
 107         "passive_mode",
 108         "insufficient_resources",
 109         "administratively_prohibited",
 110         "going_down",
 111         "parameter_violation",
 112         "protocol_violation"
 113 };
 114
 115 const char *egp_reach_codes[] = {
 116         "hello",
 117         "i-h-u"
 118 };
 119
 120 const char *egp_status_updown[] = {
 121         "indeterminate",
 122         "up",
 123         "down"
 124 };
 125
 126 const char *egp_reasons[] = {
 127         "unspecified",
 128         "bad_EGP_header_format",
 129         "bad_EGP_data_field_format",
 130         "reachability_info_unavailable",
 131         "excessive_polling_rate",
 132         "no_response",
 133         "unsupported_version"
 134 };
 135
 136 static void
 137 egpnrprint(register const struct egp_packet *egp, register u_int length)
 138 {
 139         register const u_char *cp;
 140         u_int32_t addr;
 141         register u_int32_t net;
 142         register u_int netlen;
 143         int gateways, distances, networks;
 144         int t_gateways;
 145         const char *comma;
 146
 147         addr = egp->egp_sourcenet;
 148         if (IN_CLASSA(addr)) {
 149                 net = addr & IN_CLASSA_NET;
 150                 netlen = 1;
 151         } else if (IN_CLASSB(addr)) {
 152                 net = addr & IN_CLASSB_NET;
 153                 netlen = 2;
 154         } else if (IN_CLASSC(addr)) {
 155                 net = addr & IN_CLASSC_NET;
 156                 netlen = 3;
 157         } else {
 158                 net = 0;
 159                 netlen = 0;
 160         }
 161         cp = (u_char *)(egp + 1);
 162
 163         t_gateways = egp->egp_intgw + egp->egp_extgw;
 164         for (gateways = 0; gateways < t_gateways; ++gateways) {
 165                 /* Pickup host part of gateway address */
 166                 addr = 0;
 167                 TCHECK2(cp[0], 4 - netlen);
 168                 switch (netlen) {
 169
 170                 case 1:
 171                         addr = *cp++;
 172                         /* fall through */
 173                 case 2:
 174                         addr = (addr << 8) | *cp++;
 175                         /* fall through */
 176                 case 3:
 177                         addr = (addr << 8) | *cp++;
 178                 }
 179                 addr |= net;
 180                 TCHECK2(cp[0], 1);
 181                 distances = *cp++;
 182                 printf(" %s %s ",
 183                        gateways < (int)egp->egp_intgw ? "int" : "ext",
 184                        ipaddr_string(&addr));
 185
 186                 comma = "";
 187                 putchar('(');
 188                 while (--distances >= 0) {
 189                         TCHECK2(cp[0], 2);
 190                         printf("%sd%d:", comma, (int)*cp++);
 191                         comma = ", ";
 192                         networks = *cp++;
 193                         while (--networks >= 0) {
 194                                 /* Pickup network number */
 195                                 TCHECK2(cp[0], 1);
 196                                 addr = (u_int32_t)*cp++ << 24;
 197                                 if (IN_CLASSB(addr)) {
 198                                         TCHECK2(cp[0], 1);
 199                                         addr |= (u_int32_t)*cp++ << 16;
 200                                 } else if (!IN_CLASSA(addr)) {
 201                                         TCHECK2(cp[0], 2);
 202                                         addr |= (u_int32_t)*cp++ << 16;
 203                                         addr |= (u_int32_t)*cp++ << 8;
 204                                 }
 205                                 printf(" %s", ipaddr_string(&addr));
 206                         }
 207                 }
 208                 putchar(')');
 209         }
 210         return;
 211 trunc:
 212         fputs("[|]", stdout);
 213 }
 214
 215 void
 216 egp_print(register const u_char *bp, register u_int length,
 217           register const u_char *bp2)
 218 {
 219         register const struct egp_packet *egp;
 220         register const struct ip *ip;
 221         register int status;
 222         register int code;
 223         register int type;
 224
 225         egp = (struct egp_packet *)bp;
 226         ip = (struct ip *)bp2;
 227         (void)printf("egp: ");
 228
 229         if (egp->egp_version != EGP_VERSION) {
 230                 printf("[version %d]", egp->egp_version);
 231                 return;
 232         }
 233         printf("as:%d seq:%d", ntohs(egp->egp_as), ntohs(egp->egp_sequence));
 234
 235         type = egp->egp_type;
 236         code = egp->egp_code;
 237         status = egp->egp_status;
 238
 239         switch (type) {
 240         case EGPT_ACQUIRE:
 241                 printf(" acquire");
 242                 switch (code) {
 243                 case EGPC_REQUEST:
 244                 case EGPC_CONFIRM:
 245                         printf(" %s", egp_acquire_codes[code]);
 246                         switch (status) {
 247                         case EGPS_UNSPEC:
 248                         case EGPS_ACTIVE:
 249                         case EGPS_PASSIVE:
 250                                 printf(" %s", egp_acquire_status[status]);
 251                                 break;
 252
 253                         default:
 254                                 printf(" [status %d]", status);
 255                                 break;
 256                         }
 257                         printf(" hello:%d poll:%d",
 258                                ntohs(egp->egp_hello),
 259                                ntohs(egp->egp_poll));
 260                         break;
 261
 262                 case EGPC_REFUSE:
 263                 case EGPC_CEASE:
 264                 case EGPC_CEASEACK:
 265                         printf(" %s", egp_acquire_codes[code]);
 266                         switch (status ) {
 267                         case EGPS_UNSPEC:
 268                         case EGPS_NORES:
 269                         case EGPS_ADMIN:
 270                         case EGPS_GODOWN:
 271                         case EGPS_PARAM:
 272                         case EGPS_PROTO:
 273                                 printf(" %s", egp_acquire_status[status]);
 274                                 break;
 275
 276                         default:
 277                                 printf("[status %d]", status);
 278                                 break;
 279                         }
 280                         break;
 281
 282                 default:
 283                         printf("[code %d]", code);
 284                         break;
 285                 }
 286                 break;
 287
 288         case EGPT_REACH:
 289                 switch (code) {
 290
 291                 case EGPC_HELLO:
 292                 case EGPC_HEARDU:
 293                         printf(" %s", egp_reach_codes[code]);
 294                         if (status <= EGPS_DOWN)
 295                                 printf(" state:%s", egp_status_updown[status]);
 296                         else
 297                                 printf(" [status %d]", status);
 298                         break;
 299
 300                 default:
 301                         printf("[reach code %d]", code);
 302                         break;
 303                 }
 304                 break;
 305
 306         case EGPT_POLL:
 307                 printf(" poll");
 308                 if (egp->egp_status <= EGPS_DOWN)
 309                         printf(" state:%s", egp_status_updown[status]);
 310                 else
 311                         printf(" [status %d]", status);
 312                 printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
 313                 break;
 314
 315         case EGPT_UPDATE:
 316                 printf(" update");
 317                 if (status & EGPS_UNSOL) {
 318                         status &= ~EGPS_UNSOL;
 319                         printf(" unsolicited");
 320                 }
 321                 if (status <= EGPS_DOWN)
 322                         printf(" state:%s", egp_status_updown[status]);
 323                 else
 324                         printf(" [status %d]", status);
 325                 printf(" %s int %d ext %d",
 326                        ipaddr_string(&egp->egp_sourcenet),
 327                        egp->egp_intgw,
 328                        egp->egp_extgw);
 329                 if (vflag)
 330                         egpnrprint(egp, length);
 331                 break;
 332
 333         case EGPT_ERROR:
 334                 printf(" error");
 335                 if (status <= EGPS_DOWN)
 336                         printf(" state:%s", egp_status_updown[status]);
 337                 else
 338                         printf(" [status %d]", status);
 339
 340                 if (ntohs(egp->egp_reason) <= EGPR_UVERSION)
 341                         printf(" %s", egp_reasons[ntohs(egp->egp_reason)]);
 342                 else
 343                         printf(" [reason %d]", ntohs(egp->egp_reason));
 344                 break;
 345
 346         default:
 347                 printf("[type %d]", type);
 348                 break;
 349         }
 350 }