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 1.29 2002-06-01 23:50:31 guy Exp $ (LBL)";
  24 #endif
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include <sys/param.h>
  31 #include <sys/time.h>
  32 #include <sys/socket.h>
  33
  34 #include <netinet/in.h>
  35
  36 #include <netdb.h>
  37 #include <stdio.h>
  38
  39 #include "interface.h"
  40 #include "addrtoname.h"
  41
  42 #include "ip.h"
  43
  44 struct egp_packet {
  45         u_char  egp_version;
  46 #define EGP_VERSION     2
  47         u_char  egp_type;
  48 #define  EGPT_ACQUIRE   3
  49 #define  EGPT_REACH     5
  50 #define  EGPT_POLL      2
  51 #define  EGPT_UPDATE    1
  52 #define  EGPT_ERROR     8
  53         u_char  egp_code;
  54 #define  EGPC_REQUEST   0
  55 #define  EGPC_CONFIRM   1
  56 #define  EGPC_REFUSE    2
  57 #define  EGPC_CEASE     3
  58 #define  EGPC_CEASEACK  4
  59 #define  EGPC_HELLO     0
  60 #define  EGPC_HEARDU    1
  61         u_char  egp_status;
  62 #define  EGPS_UNSPEC    0
  63 #define  EGPS_ACTIVE    1
  64 #define  EGPS_PASSIVE   2
  65 #define  EGPS_NORES     3
  66 #define  EGPS_ADMIN     4
  67 #define  EGPS_GODOWN    5
  68 #define  EGPS_PARAM     6
  69 #define  EGPS_PROTO     7
  70 #define  EGPS_INDET     0
  71 #define  EGPS_UP        1
  72 #define  EGPS_DOWN      2
  73 #define  EGPS_UNSOL     0x80
  74         u_short  egp_checksum;
  75         u_short  egp_as;
  76         u_short  egp_sequence;
  77         union {
  78                 u_short  egpu_hello;
  79                 u_char egpu_gws[2];
  80                 u_short  egpu_reason;
  81 #define  EGPR_UNSPEC    0
  82 #define  EGPR_BADHEAD   1
  83 #define  EGPR_BADDATA   2
  84 #define  EGPR_NOREACH   3
  85 #define  EGPR_XSPOLL    4
  86 #define  EGPR_NORESP    5
  87 #define  EGPR_UVERSION  6
  88         } egp_handg;
  89 #define  egp_hello  egp_handg.egpu_hello
  90 #define  egp_intgw  egp_handg.egpu_gws[0]
  91 #define  egp_extgw  egp_handg.egpu_gws[1]
  92 #define  egp_reason  egp_handg.egpu_reason
  93         union {
  94                 u_short  egpu_poll;
  95                 u_int32_t egpu_sourcenet;
  96         } egp_pands;
  97 #define  egp_poll  egp_pands.egpu_poll
  98 #define  egp_sourcenet  egp_pands.egpu_sourcenet
  99 };
 100
 101 const char *egp_acquire_codes[] = {
 102         "request",
 103         "confirm",
 104         "refuse",
 105         "cease",
 106         "cease_ack"
 107 };
 108
 109 const char *egp_acquire_status[] = {
 110         "unspecified",
 111         "active_mode",
 112         "passive_mode",
 113         "insufficient_resources",
 114         "administratively_prohibited",
 115         "going_down",
 116         "parameter_violation",
 117         "protocol_violation"
 118 };
 119
 120 const char *egp_reach_codes[] = {
 121         "hello",
 122         "i-h-u"
 123 };
 124
 125 const char *egp_status_updown[] = {
 126         "indeterminate",
 127         "up",
 128         "down"
 129 };
 130
 131 const char *egp_reasons[] = {
 132         "unspecified",
 133         "bad_EGP_header_format",
 134         "bad_EGP_data_field_format",
 135         "reachability_info_unavailable",
 136         "excessive_polling_rate",
 137         "no_response",
 138         "unsupported_version"
 139 };
 140
 141 static void
 142 egpnrprint(register const struct egp_packet *egp, register u_int length)
 143 {
 144         register const u_char *cp;
 145         u_int32_t addr;
 146         register u_int32_t net;
 147         register u_int netlen;
 148         int gateways, distances, networks;
 149         int t_gateways;
 150         char *comma;
 151
 152         addr = egp->egp_sourcenet;
 153         if (IN_CLASSA(addr)) {
 154                 net = addr & IN_CLASSA_NET;
 155                 netlen = 1;
 156         } else if (IN_CLASSB(addr)) {
 157                 net = addr & IN_CLASSB_NET;
 158                 netlen = 2;
 159         } else if (IN_CLASSC(addr)) {
 160                 net = addr & IN_CLASSC_NET;
 161                 netlen = 3;
 162         } else {
 163                 net = 0;
 164                 netlen = 0;
 165         }
 166         cp = (u_char *)(egp + 1);
 167
 168         t_gateways = egp->egp_intgw + egp->egp_extgw;
 169         for (gateways = 0; gateways < t_gateways; ++gateways) {
 170                 /* Pickup host part of gateway address */
 171                 addr = 0;
 172                 TCHECK2(cp[0], 4 - netlen);
 173                 switch (netlen) {
 174
 175                 case 1:
 176                         addr = *cp++;
 177                         /* fall through */
 178                 case 2:
 179                         addr = (addr << 8) | *cp++;
 180                         /* fall through */
 181                 case 3:
 182                         addr = (addr << 8) | *cp++;
 183                 }
 184                 addr |= net;
 185                 TCHECK2(cp[0], 1);
 186                 distances = *cp++;
 187                 printf(" %s %s ",
 188                        gateways < (int)egp->egp_intgw ? "int" : "ext",
 189                        ipaddr_string(&addr));
 190
 191                 comma = "";
 192                 putchar('(');
 193                 while (--distances >= 0) {
 194                         TCHECK2(cp[0], 2);
 195                         printf("%sd%d:", comma, (int)*cp++);
 196                         comma = ", ";
 197                         networks = *cp++;
 198                         while (--networks >= 0) {
 199                                 /* Pickup network number */
 200                                 TCHECK2(cp[0], 1);
 201                                 addr = (u_int32_t)*cp++ << 24;
 202                                 if (IN_CLASSB(addr)) {
 203                                         TCHECK2(cp[0], 1);
 204                                         addr |= (u_int32_t)*cp++ << 16;
 205                                 } else if (!IN_CLASSA(addr)) {
 206                                         TCHECK2(cp[0], 2);
 207                                         addr |= (u_int32_t)*cp++ << 16;
 208                                         addr |= (u_int32_t)*cp++ << 8;
 209                                 }
 210                                 printf(" %s", ipaddr_string(&addr));
 211                         }
 212                 }
 213                 putchar(')');
 214         }
 215         return;
 216 trunc:
 217         fputs("[|]", stdout);
 218 }
 219
 220 void
 221 egp_print(register const u_char *bp, register u_int length,
 222           register const u_char *bp2)
 223 {
 224         register const struct egp_packet *egp;
 225         register const struct ip *ip;
 226         register int status;
 227         register int code;
 228         register int type;
 229
 230         egp = (struct egp_packet *)bp;
 231         ip = (struct ip *)bp2;
 232         (void)printf("egp: ");
 233
 234         if (egp->egp_version != EGP_VERSION) {
 235                 printf("[version %d]", egp->egp_version);
 236                 return;
 237         }
 238         printf("as:%d seq:%d", ntohs(egp->egp_as), ntohs(egp->egp_sequence));
 239
 240         type = egp->egp_type;
 241         code = egp->egp_code;
 242         status = egp->egp_status;
 243
 244         switch (type) {
 245         case EGPT_ACQUIRE:
 246                 printf(" acquire");
 247                 switch (code) {
 248                 case EGPC_REQUEST:
 249                 case EGPC_CONFIRM:
 250                         printf(" %s", egp_acquire_codes[code]);
 251                         switch (status) {
 252                         case EGPS_UNSPEC:
 253                         case EGPS_ACTIVE:
 254                         case EGPS_PASSIVE:
 255                                 printf(" %s", egp_acquire_status[status]);
 256                                 break;
 257
 258                         default:
 259                                 printf(" [status %d]", status);
 260                                 break;
 261                         }
 262                         printf(" hello:%d poll:%d",
 263                                ntohs(egp->egp_hello),
 264                                ntohs(egp->egp_poll));
 265                         break;
 266
 267                 case EGPC_REFUSE:
 268                 case EGPC_CEASE:
 269                 case EGPC_CEASEACK:
 270                         printf(" %s", egp_acquire_codes[code]);
 271                         switch (status ) {
 272                         case EGPS_UNSPEC:
 273                         case EGPS_NORES:
 274                         case EGPS_ADMIN:
 275                         case EGPS_GODOWN:
 276                         case EGPS_PARAM:
 277                         case EGPS_PROTO:
 278                                 printf(" %s", egp_acquire_status[status]);
 279                                 break;
 280
 281                         default:
 282                                 printf("[status %d]", status);
 283                                 break;
 284                         }
 285                         break;
 286
 287                 default:
 288                         printf("[code %d]", code);
 289                         break;
 290                 }
 291                 break;
 292
 293         case EGPT_REACH:
 294                 switch (code) {
 295
 296                 case EGPC_HELLO:
 297                 case EGPC_HEARDU:
 298                         printf(" %s", egp_reach_codes[code]);
 299                         if (status <= EGPS_DOWN)
 300                                 printf(" state:%s", egp_status_updown[status]);
 301                         else
 302                                 printf(" [status %d]", status);
 303                         break;
 304
 305                 default:
 306                         printf("[reach code %d]", code);
 307                         break;
 308                 }
 309                 break;
 310
 311         case EGPT_POLL:
 312                 printf(" poll");
 313                 if (egp->egp_status <= EGPS_DOWN)
 314                         printf(" state:%s", egp_status_updown[status]);
 315                 else
 316                         printf(" [status %d]", status);
 317                 printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
 318                 break;
 319
 320         case EGPT_UPDATE:
 321                 printf(" update");
 322                 if (status & EGPS_UNSOL) {
 323                         status &= ~EGPS_UNSOL;
 324                         printf(" unsolicited");
 325                 }
 326                 if (status <= EGPS_DOWN)
 327                         printf(" state:%s", egp_status_updown[status]);
 328                 else
 329                         printf(" [status %d]", status);
 330                 printf(" %s int %d ext %d",
 331                        ipaddr_string(&egp->egp_sourcenet),
 332                        egp->egp_intgw,
 333                        egp->egp_extgw);
 334                 if (vflag)
 335                         egpnrprint(egp, length);
 336                 break;
 337
 338         case EGPT_ERROR:
 339                 printf(" error");
 340                 if (status <= EGPS_DOWN)
 341                         printf(" state:%s", egp_status_updown[status]);
 342                 else
 343                         printf(" [status %d]", status);
 344
 345                 if (ntohs(egp->egp_reason) <= EGPR_UVERSION)
 346                         printf(" %s", egp_reasons[ntohs(egp->egp_reason)]);
 347                 else
 348                         printf(" [reason %d]", ntohs(egp->egp_reason));
 349                 break;
 350
 351         default:
 352                 printf("[type %d]", type);
 353                 break;
 354         }
 355 }