| /* |
| * 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. |
| */ |
| |
| #ifndef lint |
| static const char rcsid[] = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-null.c,v 1.40 2000-12-16 22:00:50 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 <sys/file.h> |
| #include <sys/ioctl.h> |
| |
| struct mbuf; |
| struct rtentry; |
| |
| #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; |
| |
| 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'); |
| } |
| |