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print-egp.c

/*
 * Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Lawrence Berkeley Laboratory,
 * Berkeley, CA.  The name of the University may not be used to
 * endorse or promote products derived from this software without
 * specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Initial contribution from Jeff Honig (jch@MITCHELL.CIT.CORNELL.EDU).
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-egp.c,v 1.34.2.2 2003/11/16 08:51:18 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <stdio.h>

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"

#include "ip.h"

struct egp_packet {
      u_int8_t  egp_version;
#define     EGP_VERSION 2
      u_int8_t  egp_type;
#define  EGPT_ACQUIRE   3
#define  EGPT_REACH     5
#define  EGPT_POLL      2
#define  EGPT_UPDATE    1
#define  EGPT_ERROR     8
      u_int8_t  egp_code;
#define  EGPC_REQUEST   0
#define  EGPC_CONFIRM   1
#define  EGPC_REFUSE    2
#define  EGPC_CEASE     3
#define  EGPC_CEASEACK  4
#define  EGPC_HELLO     0
#define  EGPC_HEARDU    1
      u_int8_t  egp_status;
#define  EGPS_UNSPEC    0
#define  EGPS_ACTIVE    1
#define  EGPS_PASSIVE   2
#define  EGPS_NORES     3
#define  EGPS_ADMIN     4
#define  EGPS_GODOWN    5
#define  EGPS_PARAM     6
#define  EGPS_PROTO     7
#define  EGPS_INDET     0
#define  EGPS_UP  1
#define  EGPS_DOWN      2
#define  EGPS_UNSOL     0x80
      u_int16_t  egp_checksum;
      u_int16_t  egp_as;
      u_int16_t  egp_sequence;
      union {
            u_int16_t  egpu_hello;
            u_int8_t egpu_gws[2];
            u_int16_t  egpu_reason;
#define  EGPR_UNSPEC    0
#define  EGPR_BADHEAD   1
#define  EGPR_BADDATA   2
#define  EGPR_NOREACH   3
#define  EGPR_XSPOLL    4
#define  EGPR_NORESP    5
#define  EGPR_UVERSION  6
      } egp_handg;
#define  egp_hello  egp_handg.egpu_hello
#define  egp_intgw  egp_handg.egpu_gws[0]
#define  egp_extgw  egp_handg.egpu_gws[1]
#define  egp_reason  egp_handg.egpu_reason
      union {
            u_int16_t  egpu_poll;
            u_int32_t egpu_sourcenet;
      } egp_pands;
#define  egp_poll  egp_pands.egpu_poll
#define  egp_sourcenet  egp_pands.egpu_sourcenet
};

const char *egp_acquire_codes[] = {
      "request",
      "confirm",
      "refuse",
      "cease",
      "cease_ack"
};

const char *egp_acquire_status[] = {
      "unspecified",
      "active_mode",
      "passive_mode",
      "insufficient_resources",
      "administratively_prohibited",
      "going_down",
      "parameter_violation",
      "protocol_violation"
};

const char *egp_reach_codes[] = {
      "hello",
      "i-h-u"
};

const char *egp_status_updown[] = {
      "indeterminate",
      "up",
      "down"
};

const char *egp_reasons[] = {
      "unspecified",
      "bad_EGP_header_format",
      "bad_EGP_data_field_format",
      "reachability_info_unavailable",
      "excessive_polling_rate",
      "no_response",
      "unsupported_version"
};

static void
egpnrprint(register const struct egp_packet *egp)
{
      register const u_int8_t *cp;
      u_int32_t addr;
      register u_int32_t net;
      register u_int netlen;
      int gateways, distances, networks;
      int t_gateways;
      const char *comma;

      addr = egp->egp_sourcenet;
      if (IN_CLASSA(addr)) {
            net = addr & IN_CLASSA_NET;
            netlen = 1;
      } else if (IN_CLASSB(addr)) {
            net = addr & IN_CLASSB_NET;
            netlen = 2;
      } else if (IN_CLASSC(addr)) {
            net = addr & IN_CLASSC_NET;
            netlen = 3;
      } else {
            net = 0;
            netlen = 0;
      }
      cp = (u_int8_t *)(egp + 1);

      t_gateways = egp->egp_intgw + egp->egp_extgw;
      for (gateways = 0; gateways < t_gateways; ++gateways) {
            /* Pickup host part of gateway address */
            addr = 0;
            TCHECK2(cp[0], 4 - netlen);
            switch (netlen) {

            case 1:
                  addr = *cp++;
                  /* fall through */
            case 2:
                  addr = (addr << 8) | *cp++;
                  /* fall through */
            case 3:
                  addr = (addr << 8) | *cp++;
            }
            addr |= net;
            TCHECK2(cp[0], 1);
            distances = *cp++;
            printf(" %s %s ",
                   gateways < (int)egp->egp_intgw ? "int" : "ext",
                   ipaddr_string(&addr));

            comma = "";
            putchar('(');
            while (--distances >= 0) {
                  TCHECK2(cp[0], 2);
                  printf("%sd%d:", comma, (int)*cp++);
                  comma = ", ";
                  networks = *cp++;
                  while (--networks >= 0) {
                        /* Pickup network number */
                        TCHECK2(cp[0], 1);
                        addr = (u_int32_t)*cp++ << 24;
                        if (IN_CLASSB(addr)) {
                              TCHECK2(cp[0], 1);
                              addr |= (u_int32_t)*cp++ << 16;
                        } else if (!IN_CLASSA(addr)) {
                              TCHECK2(cp[0], 2);
                              addr |= (u_int32_t)*cp++ << 16;
                              addr |= (u_int32_t)*cp++ << 8;
                        }
                        printf(" %s", ipaddr_string(&addr));
                  }
            }
            putchar(')');
      }
      return;
trunc:
      fputs("[|]", stdout);
}

void
egp_print(register const u_int8_t *bp)
{
      register const struct egp_packet *egp;
      register int status;
      register int code;
      register int type;

      egp = (struct egp_packet *)bp;
      if (!TTEST(*egp)) {
            printf("[|egp]");
            return;
      }
      (void)printf("egp: ");

      if (egp->egp_version != EGP_VERSION) {
            printf("[version %d]", egp->egp_version);
            return;
      }
      printf("as:%d seq:%d", EXTRACT_16BITS(&egp->egp_as), EXTRACT_16BITS(&egp->egp_sequence));

      type = egp->egp_type;
      code = egp->egp_code;
      status = egp->egp_status;

      switch (type) {
      case EGPT_ACQUIRE:
            printf(" acquire");
            switch (code) {
            case EGPC_REQUEST:
            case EGPC_CONFIRM:
                  printf(" %s", egp_acquire_codes[code]);
                  switch (status) {
                  case EGPS_UNSPEC:
                  case EGPS_ACTIVE:
                  case EGPS_PASSIVE:
                        printf(" %s", egp_acquire_status[status]);
                        break;

                  default:
                        printf(" [status %d]", status);
                        break;
                  }
                  printf(" hello:%d poll:%d",
                         EXTRACT_16BITS(&egp->egp_hello),
                         EXTRACT_16BITS(&egp->egp_poll));
                  break;

            case EGPC_REFUSE:
            case EGPC_CEASE:
            case EGPC_CEASEACK:
                  printf(" %s", egp_acquire_codes[code]);
                  switch (status ) {
                  case EGPS_UNSPEC:
                  case EGPS_NORES:
                  case EGPS_ADMIN:
                  case EGPS_GODOWN:
                  case EGPS_PARAM:
                  case EGPS_PROTO:
                        printf(" %s", egp_acquire_status[status]);
                        break;

                  default:
                        printf("[status %d]", status);
                        break;
                  }
                  break;

            default:
                  printf("[code %d]", code);
                  break;
            }
            break;

      case EGPT_REACH:
            switch (code) {

            case EGPC_HELLO:
            case EGPC_HEARDU:
                  printf(" %s", egp_reach_codes[code]);
                  if (status <= EGPS_DOWN)
                        printf(" state:%s", egp_status_updown[status]);
                  else
                        printf(" [status %d]", status);
                  break;

            default:
                  printf("[reach code %d]", code);
                  break;
            }
            break;

      case EGPT_POLL:
            printf(" poll");
            if (egp->egp_status <= EGPS_DOWN)
                  printf(" state:%s", egp_status_updown[status]);
            else
                  printf(" [status %d]", status);
            printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
            break;

      case EGPT_UPDATE:
            printf(" update");
            if (status & EGPS_UNSOL) {
                  status &= ~EGPS_UNSOL;
                  printf(" unsolicited");
            }
            if (status <= EGPS_DOWN)
                  printf(" state:%s", egp_status_updown[status]);
            else
                  printf(" [status %d]", status);
            printf(" %s int %d ext %d",
                   ipaddr_string(&egp->egp_sourcenet),
                   egp->egp_intgw,
                   egp->egp_extgw);
            if (vflag)
                  egpnrprint(egp);
            break;

      case EGPT_ERROR:
            printf(" error");
            if (status <= EGPS_DOWN)
                  printf(" state:%s", egp_status_updown[status]);
            else
                  printf(" [status %d]", status);

            if (EXTRACT_16BITS(&egp->egp_reason) <= EGPR_UVERSION)
                  printf(" %s", egp_reasons[EXTRACT_16BITS(&egp->egp_reason)]);
            else
                  printf(" [reason %d]", EXTRACT_16BITS(&egp->egp_reason));
            break;

      default:
            printf("[type %d]", type);
            break;
      }
}

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