mirror of
https://github.com/the-tcpdump-group/tcpdump.git
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149 lines
4.0 KiB
C
149 lines
4.0 KiB
C
/*
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* Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
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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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#define NETDISSECT_REWORKED
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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 <string.h>
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#include "interface.h"
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#include "af.h"
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/*
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* The DLT_NULL packet header is 4 bytes long. It contains a host-byte-order
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* 32-bit integer that specifies the family, e.g. AF_INET.
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*
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* Note here that "host" refers to the host on which the packets were
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* captured; that isn't necessarily *this* host.
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*
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* The OpenBSD DLT_LOOP packet header is the same, except that the integer
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* is in network byte order.
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*/
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#define NULL_HDRLEN 4
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/*
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* Byte-swap a 32-bit number.
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* ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
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* big-endian platforms.)
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*/
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#define SWAPLONG(y) \
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((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
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static inline void
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null_hdr_print(netdissect_options *ndo, u_int family, u_int length)
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{
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if (!ndo->ndo_qflag) {
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ND_PRINT((ndo, "AF %s (%u)",
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tok2str(bsd_af_values,"Unknown",family),family));
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} else {
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ND_PRINT((ndo, "%s",
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tok2str(bsd_af_values,"Unknown AF %u",family)));
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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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null_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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u_int family;
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if (caplen < NULL_HDRLEN) {
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ND_PRINT((ndo, "[|null]"));
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return (NULL_HDRLEN);
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}
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memcpy((char *)&family, (char *)p, sizeof(family));
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/*
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* This isn't necessarily in our host byte order; if this is
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* a DLT_LOOP capture, it's in network byte order, and if
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* this is a DLT_NULL capture from a machine with the opposite
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* byte-order, it's in the opposite byte order from ours.
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*
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* If the upper 16 bits aren't all zero, assume it's byte-swapped.
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*/
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if ((family & 0xFFFF0000) != 0)
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family = SWAPLONG(family);
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if (ndo->ndo_eflag)
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null_hdr_print(ndo, family, length);
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length -= NULL_HDRLEN;
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caplen -= NULL_HDRLEN;
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p += NULL_HDRLEN;
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switch (family) {
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case BSD_AFNUM_INET:
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ip_print(ndo, p, length);
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break;
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#ifdef INET6
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case BSD_AFNUM_INET6_BSD:
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case BSD_AFNUM_INET6_FREEBSD:
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case BSD_AFNUM_INET6_DARWIN:
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ip6_print(ndo, p, length);
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break;
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#endif
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case BSD_AFNUM_ISO:
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isoclns_print(ndo, p, length, caplen);
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break;
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case BSD_AFNUM_APPLETALK:
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atalk_print(ndo, p, length);
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break;
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case BSD_AFNUM_IPX:
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ipx_print(ndo, p, length);
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break;
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default:
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/* unknown AF_ value */
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if (!ndo->ndo_eflag)
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null_hdr_print(ndo, family, length + NULL_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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return (NULL_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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