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Diffstat (limited to 'contrib/tcpdump/print-null.c')
| -rw-r--r-- | contrib/tcpdump/print-null.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-null.c b/contrib/tcpdump/print-null.c new file mode 100644 index 0000000..f8aa37b --- /dev/null +++ b/contrib/tcpdump/print-null.c @@ -0,0 +1,165 @@ +/* + * 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[] = + "@(#) $Header: /tcpdump/master/tcpdump/print-null.c,v 1.41.4.1 2002/06/01 23:51:15 guy Exp $ (LBL)"; +#endif + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <sys/param.h> +#include <sys/time.h> +#include <sys/socket.h> + +#include <netinet/in.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 + +#ifndef AF_NS +#define AF_NS 6 /* XEROX NS protocols */ +#endif + +/* + * 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 + +static void +null_print(u_int family, u_int length) +{ + if (nflag) + printf("AF %u ", family); + else { + switch (family) { + + case AF_INET: + printf("ip "); + break; + +#ifdef INET6 + case AF_INET6: + printf("ip6 "); + break; +#endif + + case AF_NS: + printf("ns "); + break; + + default: + printf("AF %u ", family); + break; + } + } + printf("%d: ", length); +} + +/* + * 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)) + +void +null_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) +{ + u_int length = h->len; + u_int caplen = h->caplen; + const struct ip *ip; + u_int family; + + ++infodelay; + ts_print(&h->ts); + + 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); + + /* + * Some printers want to get back at the link level addresses, + * and/or check that they're not walking off the end of the packet. + * Rather than pass them all the way down, we set these globals. + */ + packetp = p; + snapend = p + caplen; + + length -= NULL_HDRLEN; + + ip = (struct ip *)(p + NULL_HDRLEN); + + if (eflag) + null_print(family, length); + + switch (IP_V(ip)) { + case 4: + ip_print((const u_char *)ip, length); + break; +#ifdef INET6 + case 6: + ip6_print((const u_char *)ip, length); + break; +#endif /* INET6 */ + default: + printf("ip v%d", IP_V(ip)); + break; + } + + if (xflag) + default_print((const u_char *)ip, caplen - NULL_HDRLEN); + putchar('\n'); + --infodelay; + if (infoprint) + info(0); +} + |
