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 1.23 1999-10-07 23:47:11 mcr Exp $ (LBL)";
  24 #endif
  25
  26 #include <sys/param.h>
  27 #include <sys/time.h>
  28 #include <sys/uio.h>
  29 #include <sys/socket.h>
  30
  31 #include <netinet/in.h>
  32 #include <netinet/in_systm.h>
  33 #include <netinet/ip.h>
  34
  35 #include <netdb.h>
  36 #include <stdio.h>
  37
  38 #include "interface.h"
  39 #include "addrtoname.h"
  40
  41 struct egp_packet {
  42         u_char  egp_version;
  43 #define EGP_VERSION     2
  44         u_char  egp_type;
  45 #define  EGPT_ACQUIRE   3
  46 #define  EGPT_REACH     5
  47 #define  EGPT_POLL      2
  48 #define  EGPT_UPDATE    1
  49 #define  EGPT_ERROR     8
  50         u_char  egp_code;
  51 #define  EGPC_REQUEST   0
  52 #define  EGPC_CONFIRM   1
  53 #define  EGPC_REFUSE    2
  54 #define  EGPC_CEASE     3
  55 #define  EGPC_CEASEACK  4
  56 #define  EGPC_HELLO     0
  57 #define  EGPC_HEARDU    1
  58         u_char  egp_status;
  59 #define  EGPS_UNSPEC    0
  60 #define  EGPS_ACTIVE    1
  61 #define  EGPS_PASSIVE   2
  62 #define  EGPS_NORES     3
  63 #define  EGPS_ADMIN     4
  64 #define  EGPS_GODOWN    5
  65 #define  EGPS_PARAM     6
  66 #define  EGPS_PROTO     7
  67 #define  EGPS_INDET     0
  68 #define  EGPS_UP        1
  69 #define  EGPS_DOWN      2
  70 #define  EGPS_UNSOL     0x80
  71         u_short  egp_checksum;
  72         u_short  egp_as;
  73         u_short  egp_sequence;
  74         union {
  75                 u_short  egpu_hello;
  76                 u_char egpu_gws[2];
  77                 u_short  egpu_reason;
  78 #define  EGPR_UNSPEC    0
  79 #define  EGPR_BADHEAD   1
  80 #define  EGPR_BADDATA   2
  81 #define  EGPR_NOREACH   3
  82 #define  EGPR_XSPOLL    4
  83 #define  EGPR_NORESP    5
  84 #define  EGPR_UVERSION  6
  85         } egp_handg;
  86 #define  egp_hello  egp_handg.egpu_hello
  87 #define  egp_intgw  egp_handg.egpu_gws[0]
  88 #define  egp_extgw  egp_handg.egpu_gws[1]
  89 #define  egp_reason  egp_handg.egpu_reason
  90         union {
  91                 u_short  egpu_poll;
  92                 u_int32_t egpu_sourcenet;
  93         } egp_pands;
  94 #define  egp_poll  egp_pands.egpu_poll
  95 #define  egp_sourcenet  egp_pands.egpu_sourcenet
  96 };
  97
  98 char *egp_acquire_codes[] = {
  99         "request",
 100         "confirm",
 101         "refuse",
 102         "cease",
 103         "cease_ack"
 104 };
 105
 106 char *egp_acquire_status[] = {
 107         "unspecified",
 108         "active_mode",
 109         "passive_mode",
 110         "insufficient_resources",
 111         "administratively_prohibited",
 112         "going_down",
 113         "parameter_violation",
 114         "protocol_violation"
 115 };
 116
 117 char *egp_reach_codes[] = {
 118         "hello",
 119         "i-h-u"
 120 };
 121
 122 char *egp_status_updown[] = {
 123         "indeterminate",
 124         "up",
 125         "down"
 126 };
 127
 128 char *egp_reasons[] = {
 129         "unspecified",
 130         "bad_EGP_header_format",
 131         "bad_EGP_data_field_format",
 132         "reachability_info_unavailable",
 133         "excessive_polling_rate",
 134         "no_response",
 135         "unsupported_version"
 136 };
 137
 138 static void
 139 egpnrprint(register const struct egp_packet *egp, register u_int length)
 140 {
 141         register const u_char *cp;
 142         u_int32_t addr;
 143         register u_int32_t net;
 144         register u_int netlen;
 145         int gateways, distances, networks;
 146         int t_gateways;
 147         char *comma;
 148
 149         addr = egp->egp_sourcenet;
 150         if (IN_CLASSA(addr)) {
 151                 net = addr & IN_CLASSA_NET;
 152                 netlen = 1;
 153         } else if (IN_CLASSB(addr)) {
 154                 net = addr & IN_CLASSB_NET;
 155                 netlen = 2;
 156         } else if (IN_CLASSC(addr)) {
 157                 net = addr & IN_CLASSC_NET;
 158                 netlen = 3;
 159         } else {
 160                 net = 0;
 161                 netlen = 0;
 162         }
 163         cp = (u_char *)(egp + 1);
 164
 165         t_gateways = egp->egp_intgw + egp->egp_extgw;
 166         for (gateways = 0; gateways < t_gateways; ++gateways) {
 167                 /* Pickup host part of gateway address */
 168                 addr = 0;
 169                 TCHECK2(cp[0], 4 - netlen);
 170                 switch (netlen) {
 171
 172                 case 1:
 173                         addr = *cp++;
 174                         /* fall through */
 175                 case 2:
 176                         addr = (addr << 8) | *cp++;
 177                         /* fall through */
 178                 case 3:
 179                         addr = (addr << 8) | *cp++;
 180                 }
 181                 addr |= net;
 182                 TCHECK2(cp[0], 1);
 183                 distances = *cp++;
 184                 printf(" %s %s ",
 185                        gateways < (int)egp->egp_intgw ? "int" : "ext",
 186                        ipaddr_string(&addr));
 187
 188                 comma = "";
 189                 putchar('(');
 190                 while (--distances >= 0) {
 191                         TCHECK2(cp[0], 2);
 192                         printf("%sd%d:", comma, (int)*cp++);
 193                         comma = ", ";
 194                         networks = *cp++;
 195                         while (--networks >= 0) {
 196                                 /* Pickup network number */
 197                                 TCHECK2(cp[0], 1);
 198                                 addr = (u_int32_t)*cp++ << 24;
 199                                 if (IN_CLASSB(addr)) {
 200                                         TCHECK2(cp[0], 1);
 201                                         addr |= (u_int32_t)*cp++ << 16;
 202                                 } else if (!IN_CLASSA(addr)) {
 203                                         TCHECK2(cp[0], 2);
 204                                         addr |= (u_int32_t)*cp++ << 16;
 205                                         addr |= (u_int32_t)*cp++ << 8;
 206                                 }
 207                                 printf(" %s", ipaddr_string(&addr));
 208                         }
 209                 }
 210                 putchar(')');
 211         }
 212         return;
 213 trunc:
 214         fputs("[|]", stdout);
 215 }
 216
 217 void
 218 egp_print(register const u_char *bp, register u_int length,
 219           register const u_char *bp2)
 220 {
 221         register const struct egp_packet *egp;
 222         register const struct ip *ip;
 223         register int status;
 224         register int code;
 225         register int type;
 226
 227         egp = (struct egp_packet *)bp;
 228         ip = (struct ip *)bp2;
 229         (void)printf("%s > %s: egp: ",
 230                      ipaddr_string(&ip->ip_src),
 231                      ipaddr_string(&ip->ip_dst));
 232
 233         if (egp->egp_version != EGP_VERSION) {
 234                 printf("[version %d]", egp->egp_version);
 235                 return;
 236         }
 237         printf("as:%d seq:%d", ntohs(egp->egp_as), ntohs(egp->egp_sequence));
 238
 239         type = egp->egp_type;
 240         code = egp->egp_code;
 241         status = egp->egp_status;
 242
 243         switch (type) {
 244         case EGPT_ACQUIRE:
 245                 printf(" acquire");
 246                 switch (code) {
 247                 case EGPC_REQUEST:
 248                 case EGPC_CONFIRM:
 249                         printf(" %s", egp_acquire_codes[code]);
 250                         switch (status) {
 251                         case EGPS_UNSPEC:
 252                         case EGPS_ACTIVE:
 253                         case EGPS_PASSIVE:
 254                                 printf(" %s", egp_acquire_status[status]);
 255                                 break;
 256
 257                         default:
 258                                 printf(" [status %d]", status);
 259                                 break;
 260                         }
 261                         printf(" hello:%d poll:%d",
 262                                ntohs(egp->egp_hello),
 263                                ntohs(egp->egp_poll));
 264                         break;
 265
 266                 case EGPC_REFUSE:
 267                 case EGPC_CEASE:
 268                 case EGPC_CEASEACK:
 269                         printf(" %s", egp_acquire_codes[code]);
 270                         switch (status ) {
 271                         case EGPS_UNSPEC:
 272                         case EGPS_NORES:
 273                         case EGPS_ADMIN:
 274                         case EGPS_GODOWN:
 275                         case EGPS_PARAM:
 276                         case EGPS_PROTO:
 277                                 printf(" %s", egp_acquire_status[status]);
 278                                 break;
 279
 280                         default:
 281                                 printf("[status %d]", status);
 282                                 break;
 283                         }
 284                         break;
 285
 286                 default:
 287                         printf("[code %d]", code);
 288                         break;
 289                 }
 290                 break;
 291
 292         case EGPT_REACH:
 293                 switch (code) {
 294
 295                 case EGPC_HELLO:
 296                 case EGPC_HEARDU:
 297                         printf(" %s", egp_reach_codes[code]);
 298                         if (status <= EGPS_DOWN)
 299                                 printf(" state:%s", egp_status_updown[status]);
 300                         else
 301                                 printf(" [status %d]", status);
 302                         break;
 303
 304                 default:
 305                         printf("[reach code %d]", code);
 306                         break;
 307                 }
 308                 break;
 309
 310         case EGPT_POLL:
 311                 printf(" poll");
 312                 if (egp->egp_status <= EGPS_DOWN)
 313                         printf(" state:%s", egp_status_updown[status]);
 314                 else
 315                         printf(" [status %d]", status);
 316                 printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
 317                 break;
 318
 319         case EGPT_UPDATE:
 320                 printf(" update");
 321                 if (status & EGPS_UNSOL) {
 322                         status &= ~EGPS_UNSOL;
 323                         printf(" unsolicited");
 324                 }
 325                 if (status <= EGPS_DOWN)
 326                         printf(" state:%s", egp_status_updown[status]);
 327                 else
 328                         printf(" [status %d]", status);
 329                 printf(" %s int %d ext %d",
 330                        ipaddr_string(&egp->egp_sourcenet),
 331                        egp->egp_intgw,
 332                        egp->egp_extgw);
 333                 if (vflag)
 334                         egpnrprint(egp, length);
 335                 break;
 336
 337         case EGPT_ERROR:
 338                 printf(" error");
 339                 if (status <= EGPS_DOWN)
 340                         printf(" state:%s", egp_status_updown[status]);
 341                 else
 342                         printf(" [status %d]", status);
 343
 344                 if (ntohs(egp->egp_reason) <= EGPR_UVERSION)
 345                         printf(" %s", egp_reasons[ntohs(egp->egp_reason)]);
 346                 else
 347                         printf(" [reason %d]", ntohs(egp->egp_reason));
 348                 break;
 349
 350         default:
 351                 printf("[type %d]", type);
 352                 break;
 353         }
 354 }