167 lines
4.4 KiB
C
Executable File
167 lines
4.4 KiB
C
Executable File
/*
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* Copyright (c) 2013, Petar Alilovic,
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* Faculty of Electrical Engineering and Computing, University of Zagreb
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* 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 the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*/
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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 <tcpdump-stdinc.h>
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#include "interface.h"
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#if defined(DLT_NFLOG) && defined(HAVE_PCAP_NFLOG_H)
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#include <pcap/nflog.h>
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static const struct tok nflog_values[] = {
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{ AF_INET, "IPv4" },
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#ifdef INET6
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{ AF_INET6, "IPv6" },
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#endif /*INET6*/
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{ 0, NULL }
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};
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static inline void
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nflog_hdr_print(netdissect_options *ndo, const nflog_hdr_t *hdr, u_int length)
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{
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ND_PRINT((ndo, "version %d, resource ID %d", hdr->nflog_version, ntohs(hdr->nflog_rid)));
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if (!ndo->ndo_qflag) {
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ND_PRINT((ndo,", family %s (%d)",
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tok2str(nflog_values, "Unknown",
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hdr->nflog_family),
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hdr->nflog_family));
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} else {
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ND_PRINT((ndo,", %s",
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tok2str(nflog_values,
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"Unknown NFLOG (0x%02x)",
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hdr->nflog_family)));
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}
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ND_PRINT((ndo, ", length %u: ", length));
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}
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u_int
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nflog_if_print(netdissect_options *ndo,
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const struct pcap_pkthdr *h, const u_char *p)
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{
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const nflog_hdr_t *hdr = (const nflog_hdr_t *)p;
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const nflog_tlv_t *tlv;
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uint16_t size;
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uint16_t h_size = sizeof(nflog_hdr_t);
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u_int caplen = h->caplen;
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u_int length = h->len;
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if (caplen < (int) sizeof(nflog_hdr_t) || length < (int) sizeof(nflog_hdr_t)) {
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ND_PRINT((ndo, "[|nflog]"));
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return h_size;
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}
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if (!(hdr->nflog_version) == 0) {
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ND_PRINT((ndo, "version %u (unknown)", hdr->nflog_version));
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return h_size;
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}
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if (ndo->ndo_eflag)
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nflog_hdr_print(ndo, hdr, length);
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p += sizeof(nflog_hdr_t);
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length -= sizeof(nflog_hdr_t);
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caplen -= sizeof(nflog_hdr_t);
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while (length > 0) {
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/* We have some data. Do we have enough for the TLV header? */
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if (caplen < sizeof(nflog_tlv_t) || length < sizeof(nflog_tlv_t)) {
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/* No. */
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ND_PRINT((ndo, "[|nflog]"));
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return h_size;
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}
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tlv = (const nflog_tlv_t *) p;
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size = tlv->tlv_length;
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if (size % 4 != 0)
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size += 4 - size % 4;
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/* Is the TLV's length less than the minimum? */
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if (size < sizeof(nflog_tlv_t)) {
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/* Yes. Give up now. */
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ND_PRINT((ndo, "[|nflog]"));
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return h_size;
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}
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/* Do we have enough data for the full TLV? */
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if (caplen < size || length < size) {
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/* No. */
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ND_PRINT((ndo, "[|nflog]"));
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return h_size;
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}
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if (tlv->tlv_type == NFULA_PAYLOAD) {
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/*
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* This TLV's data is the packet payload.
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* Skip past the TLV header, and break out
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* of the loop so we print the packet data.
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*/
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p += sizeof(nflog_tlv_t);
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h_size += sizeof(nflog_tlv_t);
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length -= sizeof(nflog_tlv_t);
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caplen -= sizeof(nflog_tlv_t);
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break;
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}
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p += size;
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h_size += size;
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length -= size;
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caplen -= size;
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}
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switch (hdr->nflog_family) {
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case AF_INET:
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ip_print(ndo, p, length);
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break;
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#ifdef AF_INET6
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case AF_INET6:
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ip6_print(ndo, p, length);
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break;
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#endif /* AF_INET6 */
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default:
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if (!ndo->ndo_eflag)
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nflog_hdr_print(ndo, hdr,
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length + sizeof(nflog_hdr_t));
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(p, caplen);
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break;
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}
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return h_size;
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}
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#endif /* defined(DLT_NFLOG) && defined(HAVE_PCAP_NFLOG_H) */
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