Local changes: - Update some local modifications to fix build - Synch config.h with upstream as much as possible Changelog: https://git.tcpdump.org/tcpdump/blob/55bc126b0216cfe409b8d6bd378f65679d136ddf:/CHANGES Reviewed by: emaste Obtained from: https://www.tcpdump.org/release/tcpdump-4.99.4.tar.gz Sponsored by: The FreeBSD Foundation
393 lines
8.8 KiB
C
393 lines
8.8 KiB
C
/*
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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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/* specification: RFC 827 */
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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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nd_uint8_t egp_version;
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#define EGP_VERSION 2
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nd_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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nd_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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nd_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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nd_uint16_t egp_checksum;
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nd_uint16_t egp_as;
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nd_uint16_t egp_sequence;
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union {
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nd_uint16_t egpu_hello;
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nd_uint8_t egpu_gws[2];
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nd_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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nd_uint16_t egpu_poll;
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nd_ipv4 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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egpnr_print(netdissect_options *ndo,
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const struct egp_packet *egp, u_int length)
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{
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const uint8_t *cp;
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uint32_t addr;
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uint32_t net;
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u_int netlen;
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u_int gateways, distances, networks;
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u_int intgw, extgw, t_gateways;
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const char *comma;
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addr = GET_IPV4_TO_NETWORK_ORDER(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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intgw = GET_U_1(egp->egp_intgw);
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extgw = GET_U_1(egp->egp_extgw);
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t_gateways = intgw + 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_TCHECK_LEN(cp, 4 - netlen);
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switch (netlen) {
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case 1:
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addr = GET_U_1(cp);
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cp++;
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/* fall through */
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case 2:
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addr = (addr << 8) | GET_U_1(cp);
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cp++;
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/* fall through */
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case 3:
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addr = (addr << 8) | GET_U_1(cp);
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cp++;
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break;
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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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distances = GET_U_1(cp);
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cp++;
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length--;
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ND_PRINT(" %s %s ",
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gateways < intgw ? "int" : "ext",
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ipaddr_string(ndo, (const u_char *)&addr)); /* local buffer, not packet data; don't use GET_IPADDR_STRING() */
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comma = "";
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ND_PRINT("(");
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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_PRINT("%sd%u:", comma, GET_U_1(cp));
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cp++;
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comma = ", ";
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networks = GET_U_1(cp);
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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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addr = ((uint32_t) GET_U_1(cp)) << 24;
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cp++;
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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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addr |= ((uint32_t) GET_U_1(cp)) << 16;
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cp++;
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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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addr |= ((uint32_t) GET_U_1(cp)) << 16;
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cp++;
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addr |= ((uint32_t) GET_U_1(cp)) << 8;
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cp++;
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length -= 2;
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}
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ND_PRINT(" %s", ipaddr_string(ndo, (const u_char *)&addr)); /* local buffer, not packet data; don't use GET_IPADDR_STRING() */
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networks--;
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}
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distances--;
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}
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ND_PRINT(")");
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}
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return;
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trunc:
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nd_print_trunc(ndo);
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}
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void
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egp_print(netdissect_options *ndo,
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const uint8_t *bp, u_int length)
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{
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const struct egp_packet *egp;
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u_int version;
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u_int type;
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u_int code;
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u_int status;
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ndo->ndo_protocol = "egp";
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egp = (const struct egp_packet *)bp;
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if (length < sizeof(*egp) || !ND_TTEST_SIZE(egp)) {
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nd_print_trunc(ndo);
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return;
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}
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version = GET_U_1(egp->egp_version);
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if (!ndo->ndo_vflag) {
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ND_PRINT("EGPv%u, AS %u, seq %u, length %u",
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version,
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GET_BE_U_2(egp->egp_as),
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GET_BE_U_2(egp->egp_sequence),
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length);
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return;
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} else
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ND_PRINT("EGPv%u, length %u",
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version,
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length);
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if (version != EGP_VERSION) {
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ND_PRINT("[version %u]", version);
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return;
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}
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type = GET_U_1(egp->egp_type);
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code = GET_U_1(egp->egp_code);
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status = GET_U_1(egp->egp_status);
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switch (type) {
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case EGPT_ACQUIRE:
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ND_PRINT(" 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(" %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(" %s", egp_acquire_status[status]);
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break;
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default:
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ND_PRINT(" [status %u]", status);
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break;
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}
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ND_PRINT(" hello:%u poll:%u",
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GET_BE_U_2(egp->egp_hello),
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GET_BE_U_2(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(" %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(" %s", egp_acquire_status[status]);
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break;
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default:
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ND_PRINT("[status %u]", 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("[code %u]", 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(" %s", egp_reach_codes[code]);
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if (status <= EGPS_DOWN)
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ND_PRINT(" state:%s", egp_status_updown[status]);
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else
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ND_PRINT(" [status %u]", status);
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break;
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default:
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ND_PRINT("[reach code %u]", 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(" poll");
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if (status <= EGPS_DOWN)
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ND_PRINT(" state:%s", egp_status_updown[status]);
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else
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ND_PRINT(" [status %u]", status);
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ND_PRINT(" net:%s", GET_IPADDR_STRING(egp->egp_sourcenet));
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break;
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case EGPT_UPDATE:
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ND_PRINT(" update");
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if (status & EGPS_UNSOL) {
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status &= ~EGPS_UNSOL;
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ND_PRINT(" unsolicited");
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}
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if (status <= EGPS_DOWN)
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ND_PRINT(" state:%s", egp_status_updown[status]);
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else
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ND_PRINT(" [status %u]", status);
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ND_PRINT(" %s int %u ext %u",
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GET_IPADDR_STRING(egp->egp_sourcenet),
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GET_U_1(egp->egp_intgw),
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GET_U_1(egp->egp_extgw));
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if (ndo->ndo_vflag)
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egpnr_print(ndo, egp, length);
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break;
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case EGPT_ERROR:
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ND_PRINT(" error");
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if (status <= EGPS_DOWN)
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ND_PRINT(" state:%s", egp_status_updown[status]);
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else
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ND_PRINT(" [status %u]", status);
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if (GET_BE_U_2(egp->egp_reason) <= EGPR_UVERSION)
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ND_PRINT(" %s",
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egp_reasons[GET_BE_U_2(egp->egp_reason)]);
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else
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ND_PRINT(" [reason %u]", GET_BE_U_2(egp->egp_reason));
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break;
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default:
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ND_PRINT("[type %u]", type);
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break;
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}
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}
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