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 1.28 2001-09-17 21:58:01 fenner 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/uio.h>
  33 #include <sys/socket.h>
  34
  35 #include <netinet/in.h>
  36
  37 #include <netdb.h>
  38 #include <stdio.h>
  39
  40 #include "interface.h"
  41 #include "addrtoname.h"
  42
  43 #include "ip.h"
  44
  45 struct egp_packet {
  46         u_char  egp_version;
  47 #define EGP_VERSION     2
  48         u_char  egp_type;
  49 #define  EGPT_ACQUIRE   3
  50 #define  EGPT_REACH     5
  51 #define  EGPT_POLL      2
  52 #define  EGPT_UPDATE    1
  53 #define  EGPT_ERROR     8
  54         u_char  egp_code;
  55 #define  EGPC_REQUEST   0
  56 #define  EGPC_CONFIRM   1
  57 #define  EGPC_REFUSE    2
  58 #define  EGPC_CEASE     3
  59 #define  EGPC_CEASEACK  4
  60 #define  EGPC_HELLO     0
  61 #define  EGPC_HEARDU    1
  62         u_char  egp_status;
  63 #define  EGPS_UNSPEC    0
  64 #define  EGPS_ACTIVE    1
  65 #define  EGPS_PASSIVE   2
  66 #define  EGPS_NORES     3
  67 #define  EGPS_ADMIN     4
  68 #define  EGPS_GODOWN    5
  69 #define  EGPS_PARAM     6
  70 #define  EGPS_PROTO     7
  71 #define  EGPS_INDET     0
  72 #define  EGPS_UP        1
  73 #define  EGPS_DOWN      2
  74 #define  EGPS_UNSOL     0x80
  75         u_short  egp_checksum;
  76         u_short  egp_as;
  77         u_short  egp_sequence;
  78         union {
  79                 u_short  egpu_hello;
  80                 u_char egpu_gws[2];
  81                 u_short  egpu_reason;
  82 #define  EGPR_UNSPEC    0
  83 #define  EGPR_BADHEAD   1
  84 #define  EGPR_BADDATA   2
  85 #define  EGPR_NOREACH   3
  86 #define  EGPR_XSPOLL    4
  87 #define  EGPR_NORESP    5
  88 #define  EGPR_UVERSION  6
  89         } egp_handg;
  90 #define  egp_hello  egp_handg.egpu_hello
  91 #define  egp_intgw  egp_handg.egpu_gws[0]
  92 #define  egp_extgw  egp_handg.egpu_gws[1]
  93 #define  egp_reason  egp_handg.egpu_reason
  94         union {
  95                 u_short  egpu_poll;
  96                 u_int32_t egpu_sourcenet;
  97         } egp_pands;
  98 #define  egp_poll  egp_pands.egpu_poll
  99 #define  egp_sourcenet  egp_pands.egpu_sourcenet
 100 };
 101
 102 const char *egp_acquire_codes[] = {
 103         "request",
 104         "confirm",
 105         "refuse",
 106         "cease",
 107         "cease_ack"
 108 };
 109
 110 const char *egp_acquire_status[] = {
 111         "unspecified",
 112         "active_mode",
 113         "passive_mode",
 114         "insufficient_resources",
 115         "administratively_prohibited",
 116         "going_down",
 117         "parameter_violation",
 118         "protocol_violation"
 119 };
 120
 121 const char *egp_reach_codes[] = {
 122         "hello",
 123         "i-h-u"
 124 };
 125
 126 const char *egp_status_updown[] = {
 127         "indeterminate",
 128         "up",
 129         "down"
 130 };
 131
 132 const char *egp_reasons[] = {
 133         "unspecified",
 134         "bad_EGP_header_format",
 135         "bad_EGP_data_field_format",
 136         "reachability_info_unavailable",
 137         "excessive_polling_rate",
 138         "no_response",
 139         "unsupported_version"
 140 };
 141
 142 static void
 143 egpnrprint(register const struct egp_packet *egp, register u_int length)
 144 {
 145         register const u_char *cp;
 146         u_int32_t addr;
 147         register u_int32_t net;
 148         register u_int netlen;
 149         int gateways, distances, networks;
 150         int t_gateways;
 151         char *comma;
 152
 153         addr = egp->egp_sourcenet;
 154         if (IN_CLASSA(addr)) {
 155                 net = addr & IN_CLASSA_NET;
 156                 netlen = 1;
 157         } else if (IN_CLASSB(addr)) {
 158                 net = addr & IN_CLASSB_NET;
 159                 netlen = 2;
 160         } else if (IN_CLASSC(addr)) {
 161                 net = addr & IN_CLASSC_NET;
 162                 netlen = 3;
 163         } else {
 164                 net = 0;
 165                 netlen = 0;
 166         }
 167         cp = (u_char *)(egp + 1);
 168
 169         t_gateways = egp->egp_intgw + egp->egp_extgw;
 170         for (gateways = 0; gateways < t_gateways; ++gateways) {
 171                 /* Pickup host part of gateway address */
 172                 addr = 0;
 173                 TCHECK2(cp[0], 4 - netlen);
 174                 switch (netlen) {
 175
 176                 case 1:
 177                         addr = *cp++;
 178                         /* fall through */
 179                 case 2:
 180                         addr = (addr << 8) | *cp++;
 181                         /* fall through */
 182                 case 3:
 183                         addr = (addr << 8) | *cp++;
 184                 }
 185                 addr |= net;
 186                 TCHECK2(cp[0], 1);
 187                 distances = *cp++;
 188                 printf(" %s %s ",
 189                        gateways < (int)egp->egp_intgw ? "int" : "ext",
 190                        ipaddr_string(&addr));
 191
 192                 comma = "";
 193                 putchar('(');
 194                 while (--distances >= 0) {
 195                         TCHECK2(cp[0], 2);
 196                         printf("%sd%d:", comma, (int)*cp++);
 197                         comma = ", ";
 198                         networks = *cp++;
 199                         while (--networks >= 0) {
 200                                 /* Pickup network number */
 201                                 TCHECK2(cp[0], 1);
 202                                 addr = (u_int32_t)*cp++ << 24;
 203                                 if (IN_CLASSB(addr)) {
 204                                         TCHECK2(cp[0], 1);
 205                                         addr |= (u_int32_t)*cp++ << 16;
 206                                 } else if (!IN_CLASSA(addr)) {
 207                                         TCHECK2(cp[0], 2);
 208                                         addr |= (u_int32_t)*cp++ << 16;
 209                                         addr |= (u_int32_t)*cp++ << 8;
 210                                 }
 211                                 printf(" %s", ipaddr_string(&addr));
 212                         }
 213                 }
 214                 putchar(')');
 215         }
 216         return;
 217 trunc:
 218         fputs("[|]", stdout);
 219 }
 220
 221 void
 222 egp_print(register const u_char *bp, register u_int length,
 223           register const u_char *bp2)
 224 {
 225         register const struct egp_packet *egp;
 226         register const struct ip *ip;
 227         register int status;
 228         register int code;
 229         register int type;
 230
 231         egp = (struct egp_packet *)bp;
 232         ip = (struct ip *)bp2;
 233         (void)printf("egp: ");
 234
 235         if (egp->egp_version != EGP_VERSION) {
 236                 printf("[version %d]", egp->egp_version);
 237                 return;
 238         }
 239         printf("as:%d seq:%d", ntohs(egp->egp_as), ntohs(egp->egp_sequence));
 240
 241         type = egp->egp_type;
 242         code = egp->egp_code;
 243         status = egp->egp_status;
 244
 245         switch (type) {
 246         case EGPT_ACQUIRE:
 247                 printf(" acquire");
 248                 switch (code) {
 249                 case EGPC_REQUEST:
 250                 case EGPC_CONFIRM:
 251                         printf(" %s", egp_acquire_codes[code]);
 252                         switch (status) {
 253                         case EGPS_UNSPEC:
 254                         case EGPS_ACTIVE:
 255                         case EGPS_PASSIVE:
 256                                 printf(" %s", egp_acquire_status[status]);
 257                                 break;
 258
 259                         default:
 260                                 printf(" [status %d]", status);
 261                                 break;
 262                         }
 263                         printf(" hello:%d poll:%d",
 264                                ntohs(egp->egp_hello),
 265                                ntohs(egp->egp_poll));
 266                         break;
 267
 268                 case EGPC_REFUSE:
 269                 case EGPC_CEASE:
 270                 case EGPC_CEASEACK:
 271                         printf(" %s", egp_acquire_codes[code]);
 272                         switch (status ) {
 273                         case EGPS_UNSPEC:
 274                         case EGPS_NORES:
 275                         case EGPS_ADMIN:
 276                         case EGPS_GODOWN:
 277                         case EGPS_PARAM:
 278                         case EGPS_PROTO:
 279                                 printf(" %s", egp_acquire_status[status]);
 280                                 break;
 281
 282                         default:
 283                                 printf("[status %d]", status);
 284                                 break;
 285                         }
 286                         break;
 287
 288                 default:
 289                         printf("[code %d]", code);
 290                         break;
 291                 }
 292                 break;
 293
 294         case EGPT_REACH:
 295                 switch (code) {
 296
 297                 case EGPC_HELLO:
 298                 case EGPC_HEARDU:
 299                         printf(" %s", egp_reach_codes[code]);
 300                         if (status <= EGPS_DOWN)
 301                                 printf(" state:%s", egp_status_updown[status]);
 302                         else
 303                                 printf(" [status %d]", status);
 304                         break;
 305
 306                 default:
 307                         printf("[reach code %d]", code);
 308                         break;
 309                 }
 310                 break;
 311
 312         case EGPT_POLL:
 313                 printf(" poll");
 314                 if (egp->egp_status <= EGPS_DOWN)
 315                         printf(" state:%s", egp_status_updown[status]);
 316                 else
 317                         printf(" [status %d]", status);
 318                 printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
 319                 break;
 320
 321         case EGPT_UPDATE:
 322                 printf(" update");
 323                 if (status & EGPS_UNSOL) {
 324                         status &= ~EGPS_UNSOL;
 325                         printf(" unsolicited");
 326                 }
 327                 if (status <= EGPS_DOWN)
 328                         printf(" state:%s", egp_status_updown[status]);
 329                 else
 330                         printf(" [status %d]", status);
 331                 printf(" %s int %d ext %d",
 332                        ipaddr_string(&egp->egp_sourcenet),
 333                        egp->egp_intgw,
 334                        egp->egp_extgw);
 335                 if (vflag)
 336                         egpnrprint(egp, length);
 337                 break;
 338
 339         case EGPT_ERROR:
 340                 printf(" error");
 341                 if (status <= EGPS_DOWN)
 342                         printf(" state:%s", egp_status_updown[status]);
 343                 else
 344                         printf(" [status %d]", status);
 345
 346                 if (ntohs(egp->egp_reason) <= EGPR_UVERSION)
 347                         printf(" %s", egp_reasons[ntohs(egp->egp_reason)]);
 348                 else
 349                         printf(" [reason %d]", ntohs(egp->egp_reason));
 350                 break;
 351
 352         default:
 353                 printf("[type %d]", type);
 354                 break;
 355         }
 356 }