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Diffstat (limited to 'freebsd/contrib/tcpdump/print-null.c')
| -rw-r--r-- | freebsd/contrib/tcpdump/print-null.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/freebsd/contrib/tcpdump/print-null.c b/freebsd/contrib/tcpdump/print-null.c new file mode 100644 index 00000000..ac727077 --- /dev/null +++ b/freebsd/contrib/tcpdump/print-null.c @@ -0,0 +1,164 @@ +#include <machine/rtems-bsd-user-space.h> + +/* + * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that: (1) source code distributions + * retain the above copyright notice and this paragraph in its entirety, (2) + * distributions including binary code include the above copyright notice and + * this paragraph in its entirety in the documentation or other materials + * provided with the distribution, and (3) all advertising materials mentioning + * features or use of this software display the following acknowledgement: + * ``This product includes software developed by the University of California, + * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of + * the University nor the names of its contributors may be used to endorse + * or promote products derived from this software without specific prior + * written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. + * + * $FreeBSD$ + */ + +#ifndef lint +static const char rcsid[] _U_ = + "@(#) $Header: /tcpdump/master/tcpdump/print-null.c,v 1.57 2006-03-23 14:58:44 hannes Exp $ (LBL)"; +#endif + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <tcpdump-stdinc.h> + +#include <pcap.h> +#include <stdio.h> +#include <string.h> + +#include "interface.h" +#include "addrtoname.h" + +#include "ip.h" +#ifdef INET6 +#include "ip6.h" +#endif +#include "af.h" + +/* + * The DLT_NULL packet header is 4 bytes long. It contains a host-byte-order + * 32-bit integer that specifies the family, e.g. AF_INET. + * + * Note here that "host" refers to the host on which the packets were + * captured; that isn't necessarily *this* host. + * + * The OpenBSD DLT_LOOP packet header is the same, except that the integer + * is in network byte order. + */ +#define NULL_HDRLEN 4 + +/* + * Byte-swap a 32-bit number. + * ("htonl()" or "ntohl()" won't work - we want to byte-swap even on + * big-endian platforms.) + */ +#define SWAPLONG(y) \ +((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff)) + +static inline void +null_hdr_print(u_int family, u_int length) +{ + if (!qflag) { + (void)printf("AF %s (%u)", + tok2str(bsd_af_values,"Unknown",family),family); + } else { + (void)printf("%s", + tok2str(bsd_af_values,"Unknown AF %u",family)); + } + + (void)printf(", length %u: ", length); +} + +/* + * This is the top level routine of the printer. 'p' points + * to the ether header of the packet, 'h->ts' is the timestamp, + * 'h->len' is the length of the packet off the wire, and 'h->caplen' + * is the number of bytes actually captured. + */ +u_int +null_if_print(const struct pcap_pkthdr *h, const u_char *p) +{ + u_int length = h->len; + u_int caplen = h->caplen; + u_int family; + + if (caplen < NULL_HDRLEN) { + printf("[|null]"); + return (NULL_HDRLEN); + } + + memcpy((char *)&family, (char *)p, sizeof(family)); + + /* + * This isn't necessarily in our host byte order; if this is + * a DLT_LOOP capture, it's in network byte order, and if + * this is a DLT_NULL capture from a machine with the opposite + * byte-order, it's in the opposite byte order from ours. + * + * If the upper 16 bits aren't all zero, assume it's byte-swapped. + */ + if ((family & 0xFFFF0000) != 0) + family = SWAPLONG(family); + + if (eflag) + null_hdr_print(family, length); + + length -= NULL_HDRLEN; + caplen -= NULL_HDRLEN; + p += NULL_HDRLEN; + + switch (family) { + + case BSD_AFNUM_INET: + ip_print(gndo, p, length); + break; + +#ifdef INET6 + case BSD_AFNUM_INET6_BSD: + case BSD_AFNUM_INET6_FREEBSD: + case BSD_AFNUM_INET6_DARWIN: + ip6_print(gndo, p, length); + break; +#endif + + case BSD_AFNUM_ISO: + isoclns_print(p, length, caplen); + break; + + case BSD_AFNUM_APPLETALK: + atalk_print(p, length); + break; + + case BSD_AFNUM_IPX: + ipx_print(p, length); + break; + + default: + /* unknown AF_ value */ + if (!eflag) + null_hdr_print(family, length + NULL_HDRLEN); + if (!suppress_default_print) + default_print(p, caplen); + } + + return (NULL_HDRLEN); +} + +/* + * Local Variables: + * c-style: whitesmith + * c-basic-offset: 8 + * End: + */ |