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https://github.com/the-tcpdump-group/tcpdump.git
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6bc44295cf
If a protocol that runs under a link-layer protocol would print the link-layer addresses for the packet as source and destination addresses for the packet, don't have it blithely assume those link-layer addresses are present or are at a particular offset from the beginning of that protocol's data; Ethertypes, for example, are used by a number of protocols, not all of which have Ethernet headers and not all of which have any MAC headers. Instead, pass the printers for those protocols structures with a pointer to the address data and a pointer to a routine that prints the address. Fixes some heap overflows found with American Fuzzy Lop by Hanno Böck.
115 lines
3.8 KiB
C
115 lines
3.8 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
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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, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* \summary: Symantec Enterprise Firewall 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 "extract.h"
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#include "ethertype.h"
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#include "ether.h"
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struct symantec_header {
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uint8_t stuff1[6];
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uint16_t ether_type;
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uint8_t stuff2[36];
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};
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static inline void
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symantec_hdr_print(netdissect_options *ndo, register const u_char *bp, u_int length)
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{
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register const struct symantec_header *sp;
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uint16_t etype;
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sp = (const struct symantec_header *)bp;
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etype = EXTRACT_16BITS(&sp->ether_type);
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if (!ndo->ndo_qflag) {
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if (etype <= ETHERMTU)
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ND_PRINT((ndo, "invalid ethertype %u", etype));
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else
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ND_PRINT((ndo, "ethertype %s (0x%04x)",
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tok2str(ethertype_values,"Unknown", etype),
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etype));
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} else {
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if (etype <= ETHERMTU)
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ND_PRINT((ndo, "invalid ethertype %u", etype));
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else
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ND_PRINT((ndo, "%s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", etype)));
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}
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ND_PRINT((ndo, ", length %u: ", length));
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}
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/*
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* This is the top level routine of the printer. 'p' points
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* to the ether header of the packet, 'h->ts' is the timestamp,
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* 'h->len' is the length of the packet off the wire, and 'h->caplen'
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* is the number of bytes actually captured.
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*/
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u_int
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symantec_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
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{
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u_int length = h->len;
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u_int caplen = h->caplen;
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const struct symantec_header *sp;
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u_short ether_type;
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if (caplen < sizeof (struct symantec_header)) {
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ND_PRINT((ndo, "[|symantec]"));
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return caplen;
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}
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if (ndo->ndo_eflag)
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symantec_hdr_print(ndo, p, length);
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length -= sizeof (struct symantec_header);
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caplen -= sizeof (struct symantec_header);
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sp = (const struct symantec_header *)p;
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p += sizeof (struct symantec_header);
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ether_type = EXTRACT_16BITS(&sp->ether_type);
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if (ether_type <= ETHERMTU) {
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/* ether_type not known, print raw packet */
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if (!ndo->ndo_eflag)
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symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(p, caplen);
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} else if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
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/* ether_type not known, print raw packet */
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if (!ndo->ndo_eflag)
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symantec_hdr_print(ndo, (const u_char *)sp, length + sizeof (struct symantec_header));
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(p, caplen);
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}
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return (sizeof (struct symantec_header));
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}
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