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377 lines
8.7 KiB
377 lines
8.7 KiB
/*
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* Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Lawrence Berkeley Laboratory,
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* Berkeley, CA. The name of the University may not be used to
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* endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Initial contribution from Jeff Honig (jch@MITCHELL.CIT.CORNELL.EDU).
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*/
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/* \summary: Exterior Gateway Protocol (EGP) printer */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <netdissect-stdinc.h>
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "extract.h"
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struct egp_packet {
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uint8_t egp_version;
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#define EGP_VERSION 2
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uint8_t egp_type;
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#define EGPT_ACQUIRE 3
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#define EGPT_REACH 5
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#define EGPT_POLL 2
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#define EGPT_UPDATE 1
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#define EGPT_ERROR 8
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uint8_t egp_code;
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#define EGPC_REQUEST 0
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#define EGPC_CONFIRM 1
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#define EGPC_REFUSE 2
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#define EGPC_CEASE 3
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#define EGPC_CEASEACK 4
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#define EGPC_HELLO 0
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#define EGPC_HEARDU 1
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uint8_t egp_status;
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#define EGPS_UNSPEC 0
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#define EGPS_ACTIVE 1
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#define EGPS_PASSIVE 2
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#define EGPS_NORES 3
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#define EGPS_ADMIN 4
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#define EGPS_GODOWN 5
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#define EGPS_PARAM 6
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#define EGPS_PROTO 7
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#define EGPS_INDET 0
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#define EGPS_UP 1
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#define EGPS_DOWN 2
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#define EGPS_UNSOL 0x80
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uint16_t egp_checksum;
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uint16_t egp_as;
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uint16_t egp_sequence;
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union {
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uint16_t egpu_hello;
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uint8_t egpu_gws[2];
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uint16_t egpu_reason;
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#define EGPR_UNSPEC 0
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#define EGPR_BADHEAD 1
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#define EGPR_BADDATA 2
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#define EGPR_NOREACH 3
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#define EGPR_XSPOLL 4
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#define EGPR_NORESP 5
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#define EGPR_UVERSION 6
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} egp_handg;
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#define egp_hello egp_handg.egpu_hello
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#define egp_intgw egp_handg.egpu_gws[0]
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#define egp_extgw egp_handg.egpu_gws[1]
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#define egp_reason egp_handg.egpu_reason
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union {
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uint16_t egpu_poll;
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uint32_t egpu_sourcenet;
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} egp_pands;
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#define egp_poll egp_pands.egpu_poll
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#define egp_sourcenet egp_pands.egpu_sourcenet
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};
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static const char *egp_acquire_codes[] = {
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"request",
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"confirm",
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"refuse",
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"cease",
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"cease_ack"
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};
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static const char *egp_acquire_status[] = {
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"unspecified",
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"active_mode",
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"passive_mode",
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"insufficient_resources",
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"administratively_prohibited",
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"going_down",
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"parameter_violation",
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"protocol_violation"
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};
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static const char *egp_reach_codes[] = {
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"hello",
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"i-h-u"
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};
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static const char *egp_status_updown[] = {
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"indeterminate",
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"up",
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"down"
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};
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static const char *egp_reasons[] = {
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"unspecified",
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"bad_EGP_header_format",
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"bad_EGP_data_field_format",
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"reachability_info_unavailable",
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"excessive_polling_rate",
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"no_response",
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"unsupported_version"
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};
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static void
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egpnrprint(netdissect_options *ndo,
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register const struct egp_packet *egp, u_int length)
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{
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register const uint8_t *cp;
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uint32_t addr;
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register uint32_t net;
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register u_int netlen;
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int gateways, distances, networks;
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int t_gateways;
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const char *comma;
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addr = egp->egp_sourcenet;
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if (IN_CLASSA(addr)) {
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net = addr & IN_CLASSA_NET;
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netlen = 1;
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} else if (IN_CLASSB(addr)) {
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net = addr & IN_CLASSB_NET;
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netlen = 2;
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} else if (IN_CLASSC(addr)) {
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net = addr & IN_CLASSC_NET;
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netlen = 3;
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} else {
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net = 0;
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netlen = 0;
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}
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cp = (const uint8_t *)(egp + 1);
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length -= sizeof(*egp);
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t_gateways = egp->egp_intgw + egp->egp_extgw;
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for (gateways = 0; gateways < t_gateways; ++gateways) {
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/* Pickup host part of gateway address */
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addr = 0;
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if (length < 4 - netlen)
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goto trunc;
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ND_TCHECK2(cp[0], 4 - netlen);
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switch (netlen) {
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case 1:
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addr = *cp++;
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/* fall through */
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case 2:
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addr = (addr << 8) | *cp++;
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/* fall through */
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case 3:
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addr = (addr << 8) | *cp++;
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}
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addr |= net;
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length -= 4 - netlen;
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if (length < 1)
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goto trunc;
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ND_TCHECK2(cp[0], 1);
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distances = *cp++;
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length--;
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ND_PRINT((ndo, " %s %s ",
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gateways < (int)egp->egp_intgw ? "int" : "ext",
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ipaddr_string(ndo, &addr)));
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comma = "";
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ND_PRINT((ndo, "("));
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while (--distances >= 0) {
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if (length < 2)
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goto trunc;
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ND_TCHECK2(cp[0], 2);
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ND_PRINT((ndo, "%sd%d:", comma, (int)*cp++));
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comma = ", ";
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networks = *cp++;
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length -= 2;
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while (--networks >= 0) {
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/* Pickup network number */
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if (length < 1)
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goto trunc;
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ND_TCHECK2(cp[0], 1);
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addr = (uint32_t)*cp++ << 24;
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length--;
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if (IN_CLASSB(addr)) {
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if (length < 1)
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goto trunc;
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ND_TCHECK2(cp[0], 1);
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addr |= (uint32_t)*cp++ << 16;
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length--;
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} else if (!IN_CLASSA(addr)) {
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if (length < 2)
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goto trunc;
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ND_TCHECK2(cp[0], 2);
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addr |= (uint32_t)*cp++ << 16;
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addr |= (uint32_t)*cp++ << 8;
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length -= 2;
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}
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ND_PRINT((ndo, " %s", ipaddr_string(ndo, &addr)));
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}
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}
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ND_PRINT((ndo, ")"));
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}
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return;
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trunc:
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ND_PRINT((ndo, "[|]"));
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}
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void
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egp_print(netdissect_options *ndo,
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register const uint8_t *bp, register u_int length)
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{
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register const struct egp_packet *egp;
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register int status;
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register int code;
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register int type;
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egp = (const struct egp_packet *)bp;
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if (length < sizeof(*egp) || !ND_TTEST(*egp)) {
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ND_PRINT((ndo, "[|egp]"));
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return;
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}
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if (!ndo->ndo_vflag) {
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ND_PRINT((ndo, "EGPv%u, AS %u, seq %u, length %u",
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egp->egp_version,
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EXTRACT_16BITS(&egp->egp_as),
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EXTRACT_16BITS(&egp->egp_sequence),
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length));
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return;
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} else
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ND_PRINT((ndo, "EGPv%u, length %u",
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egp->egp_version,
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length));
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if (egp->egp_version != EGP_VERSION) {
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ND_PRINT((ndo, "[version %d]", egp->egp_version));
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return;
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}
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type = egp->egp_type;
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code = egp->egp_code;
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status = egp->egp_status;
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switch (type) {
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case EGPT_ACQUIRE:
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ND_PRINT((ndo, " acquire"));
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switch (code) {
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case EGPC_REQUEST:
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case EGPC_CONFIRM:
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ND_PRINT((ndo, " %s", egp_acquire_codes[code]));
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switch (status) {
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case EGPS_UNSPEC:
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case EGPS_ACTIVE:
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case EGPS_PASSIVE:
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ND_PRINT((ndo, " %s", egp_acquire_status[status]));
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break;
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default:
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ND_PRINT((ndo, " [status %d]", status));
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break;
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}
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ND_PRINT((ndo, " hello:%d poll:%d",
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EXTRACT_16BITS(&egp->egp_hello),
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EXTRACT_16BITS(&egp->egp_poll)));
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break;
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case EGPC_REFUSE:
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case EGPC_CEASE:
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case EGPC_CEASEACK:
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ND_PRINT((ndo, " %s", egp_acquire_codes[code]));
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switch (status ) {
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case EGPS_UNSPEC:
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case EGPS_NORES:
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case EGPS_ADMIN:
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case EGPS_GODOWN:
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case EGPS_PARAM:
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case EGPS_PROTO:
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ND_PRINT((ndo, " %s", egp_acquire_status[status]));
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break;
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default:
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ND_PRINT((ndo, "[status %d]", status));
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break;
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}
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break;
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default:
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ND_PRINT((ndo, "[code %d]", code));
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break;
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}
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break;
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case EGPT_REACH:
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switch (code) {
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case EGPC_HELLO:
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case EGPC_HEARDU:
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ND_PRINT((ndo, " %s", egp_reach_codes[code]));
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if (status <= EGPS_DOWN)
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ND_PRINT((ndo, " state:%s", egp_status_updown[status]));
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else
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ND_PRINT((ndo, " [status %d]", status));
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break;
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default:
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ND_PRINT((ndo, "[reach code %d]", code));
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break;
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}
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break;
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case EGPT_POLL:
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ND_PRINT((ndo, " poll"));
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if (egp->egp_status <= EGPS_DOWN)
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ND_PRINT((ndo, " state:%s", egp_status_updown[status]));
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else
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ND_PRINT((ndo, " [status %d]", status));
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ND_PRINT((ndo, " net:%s", ipaddr_string(ndo, &egp->egp_sourcenet)));
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break;
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case EGPT_UPDATE:
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ND_PRINT((ndo, " update"));
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if (status & EGPS_UNSOL) {
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status &= ~EGPS_UNSOL;
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ND_PRINT((ndo, " unsolicited"));
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}
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if (status <= EGPS_DOWN)
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ND_PRINT((ndo, " state:%s", egp_status_updown[status]));
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else
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ND_PRINT((ndo, " [status %d]", status));
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ND_PRINT((ndo, " %s int %d ext %d",
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ipaddr_string(ndo, &egp->egp_sourcenet),
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egp->egp_intgw,
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egp->egp_extgw));
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if (ndo->ndo_vflag)
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egpnrprint(ndo, egp, length);
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break;
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case EGPT_ERROR:
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ND_PRINT((ndo, " error"));
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if (status <= EGPS_DOWN)
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ND_PRINT((ndo, " state:%s", egp_status_updown[status]));
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else
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ND_PRINT((ndo, " [status %d]", status));
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if (EXTRACT_16BITS(&egp->egp_reason) <= EGPR_UVERSION)
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ND_PRINT((ndo, " %s", egp_reasons[EXTRACT_16BITS(&egp->egp_reason)]));
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else
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ND_PRINT((ndo, " [reason %d]", EXTRACT_16BITS(&egp->egp_reason)));
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break;
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default:
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ND_PRINT((ndo, "[type %d]", type));
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break;
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}
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}
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