2015-01-06 19:03:11 +00:00
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/*
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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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2017-01-31 19:17:06 +00:00
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/* \summary: Apple's DLT_PKTAP printer */
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2015-01-06 19:03:11 +00:00
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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2017-01-31 19:17:06 +00:00
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#include <netdissect-stdinc.h>
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2015-01-06 19:03:11 +00:00
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2017-01-31 19:17:06 +00:00
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#include "netdissect.h"
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2015-01-06 19:03:11 +00:00
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#include "extract.h"
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#ifdef DLT_PKTAP
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/*
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* XXX - these are little-endian in the captures I've seen, but Apple
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* no longer make any big-endian machines (Macs use x86, iOS machines
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* use ARM and run it little-endian), so that might be by definition
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* or they might be host-endian.
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*
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* If a big-endian PKTAP file ever shows up, and it comes from a
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* big-endian machine, presumably these are host-endian, and we need
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* to just fetch the fields directly in tcpdump but byte-swap them
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* to host byte order in libpcap.
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*/
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typedef struct pktap_header {
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uint32_t pkt_len; /* length of pktap header */
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uint32_t pkt_rectype; /* type of record */
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uint32_t pkt_dlt; /* DLT type of this packet */
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char pkt_ifname[24]; /* interface name */
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uint32_t pkt_flags;
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uint32_t pkt_pfamily; /* "protocol family" */
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uint32_t pkt_llhdrlen; /* link-layer header length? */
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uint32_t pkt_lltrlrlen; /* link-layer trailer length? */
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uint32_t pkt_pid; /* process ID */
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char pkt_cmdname[20]; /* command name */
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uint32_t pkt_svc_class; /* "service class" */
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uint16_t pkt_iftype; /* "interface type" */
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uint16_t pkt_ifunit; /* unit number of interface? */
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uint32_t pkt_epid; /* "effective process ID" */
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char pkt_ecmdname[20]; /* "effective command name" */
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} pktap_header_t;
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/*
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* Record types.
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*/
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#define PKT_REC_NONE 0 /* nothing follows the header */
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#define PKT_REC_PACKET 1 /* a packet follows the header */
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static inline void
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pktap_header_print(netdissect_options *ndo, const u_char *bp, u_int length)
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{
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const pktap_header_t *hdr;
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uint32_t dlt, hdrlen;
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2017-01-31 19:17:06 +00:00
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const char *dltname;
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2015-01-06 19:03:11 +00:00
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hdr = (const pktap_header_t *)bp;
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dlt = EXTRACT_LE_32BITS(&hdr->pkt_dlt);
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hdrlen = EXTRACT_LE_32BITS(&hdr->pkt_len);
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2017-01-31 19:17:06 +00:00
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dltname = pcap_datalink_val_to_name(dlt);
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2015-01-06 19:03:11 +00:00
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if (!ndo->ndo_qflag) {
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2017-01-31 19:17:06 +00:00
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ND_PRINT((ndo,"DLT %s (%d) len %d",
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(dltname != NULL ? dltname : "UNKNOWN"), dlt, hdrlen));
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2015-01-06 19:03:11 +00:00
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} else {
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2017-01-31 19:17:06 +00:00
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ND_PRINT((ndo,"%s", (dltname != NULL ? dltname : "UNKNOWN")));
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2015-01-06 19:03:11 +00:00
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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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pktap_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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uint32_t dlt, hdrlen, rectype;
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u_int caplen = h->caplen;
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u_int length = h->len;
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2017-01-31 19:17:06 +00:00
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if_printer printer;
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const pktap_header_t *hdr;
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2017-09-18 04:10:54 +00:00
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struct pcap_pkthdr nhdr;
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2015-01-06 19:03:11 +00:00
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if (caplen < sizeof(pktap_header_t) || length < sizeof(pktap_header_t)) {
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ND_PRINT((ndo, "[|pktap]"));
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return (0);
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}
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2017-01-31 19:17:06 +00:00
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hdr = (const pktap_header_t *)p;
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2015-01-06 19:03:11 +00:00
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dlt = EXTRACT_LE_32BITS(&hdr->pkt_dlt);
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hdrlen = EXTRACT_LE_32BITS(&hdr->pkt_len);
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if (hdrlen < sizeof(pktap_header_t)) {
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/*
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* Claimed header length < structure length.
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* XXX - does this just mean some fields aren't
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* being supplied, or is it truly an error (i.e.,
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* is the length supplied so that the header can
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* be expanded in the future)?
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*/
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ND_PRINT((ndo, "[|pktap]"));
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return (0);
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}
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if (caplen < hdrlen || length < hdrlen) {
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ND_PRINT((ndo, "[|pktap]"));
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return (hdrlen);
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}
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if (ndo->ndo_eflag)
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pktap_header_print(ndo, p, length);
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length -= hdrlen;
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caplen -= hdrlen;
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p += hdrlen;
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rectype = EXTRACT_LE_32BITS(&hdr->pkt_rectype);
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switch (rectype) {
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case PKT_REC_NONE:
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ND_PRINT((ndo, "no data"));
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break;
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case PKT_REC_PACKET:
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if ((printer = lookup_printer(dlt)) != NULL) {
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2017-09-18 04:10:54 +00:00
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nhdr = *h;
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nhdr.caplen = caplen;
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nhdr.len = length;
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hdrlen += printer(ndo, &nhdr, p);
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2015-01-06 19:03:11 +00:00
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} else {
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if (!ndo->ndo_eflag)
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2017-01-31 19:17:06 +00:00
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pktap_header_print(ndo, (const u_char *)hdr,
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2015-01-06 19:03:11 +00:00
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length + hdrlen);
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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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break;
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}
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return (hdrlen);
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}
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/*
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* Local Variables:
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* c-style: whitesmith
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* c-basic-offset: 8
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* End:
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*/
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#endif /* DLT_PKTAP */
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