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tcpdump.h
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/*
* Copyright (c) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
* 2002, 2003, 2004
* Ohio University.
*
* ---
*
* Starting with the release of tcptrace version 6 in 2001, tcptrace
* is licensed under the GNU General Public License (GPL). We believe
* that, among the available licenses, the GPL will do the best job of
* allowing tcptrace to continue to be a valuable, freely-available
* and well-maintained tool for the networking community.
*
* Previous versions of tcptrace were released under a license that
* was much less restrictive with respect to how tcptrace could be
* used in commercial products. Because of this, I am willing to
* consider alternate license arrangements as allowed in Section 10 of
* the GNU GPL. Before I would consider licensing tcptrace under an
* alternate agreement with a particular individual or company,
* however, I would have to be convinced that such an alternative
* would be to the greater benefit of the networking community.
*
* ---
*
* This file is part of Tcptrace.
*
* Tcptrace was originally written and continues to be maintained by
* Shawn Ostermann with the help of a group of devoted students and
* users (see the file 'THANKS'). The work on tcptrace has been made
* possible over the years through the generous support of NASA GRC,
* the National Science Foundation, and Sun Microsystems.
*
* Tcptrace is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Tcptrace is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tcptrace (in the file 'COPYING'); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* Author: Shawn Ostermann
* School of Electrical Engineering and Computer Science
* Ohio University
* Athens, OH
* http://www.tcptrace.org/
*/
/* Added FDDI support 9/96 Jeffrey Semke, Pittsburgh Supercomputing Center */
static char const GCC_UNUSED rcsid_tcpdump[] =
"@(#)$Header: /usr/local/cvs/tcptrace/tcpdump.h,v 5.11 2003/11/19 14:38:08 sdo Exp $";
#define SWAPLONG(y) \
((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
#define SWAPSHORT(y) \
( (((y)&0xff)<<8) | (((y)&0xff00)>>8) )
/* (from bpf.h)
* Data-link level type codes.
*/
/* Note - Tue Feb 13, 2001
We're having trouble with the standard DLT_type because some OS versions,
insist on renumbering these to different values. To avoid the problem,
we're hijacking the types a little and adding the PCAP_ prefix. The
constants all correspond to the "true" pcap numbers, so this should
fix the problem */
/* currently supported */
#define PCAP_DLT_NULL 0 /* no link-layer encapsulation */
#define PCAP_DLT_EN10MB 1 /* Ethernet (10Mb) */
#define PCAP_DLT_IEEE802 6 /* IEEE 802 Networks */
#define PCAP_DLT_SLIP 8 /* Serial Line IP */
#define PCAP_DLT_PPP 9 /* Point-to-Point Protocol */
#define PCAP_DLT_FDDI 10 /* FDDI */
#define PCAP_DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */
#define PCAP_DLT_RAW 12 /* raw IP */
#define PCAP_DLT_C_HDLC 104 /* Cisco HDLC */
#define PCAP_DLT_IEEE802_11 105 /* IEEE 802.11 wireless */
#define PCAP_DLT_LINUX_SLL 113 /* Linux cooked socket */
#define PCAP_DLT_PRISM2 119 /* Prism2 raw capture header */
#define PCAP_DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */
/* NOT currently supported */
/* (mostly because I don't have an example file, send me one...) */
#define PCAP_DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */
#define PCAP_DLT_AX25 3 /* Amateur Radio AX.25 */
#define PCAP_DLT_PRONET 4 /* Proteon ProNET Token Ring */
#define PCAP_DLT_CHAOS 5 /* Chaos */
#define PCAP_DLT_ARCNET 7 /* ARCNET */
#define PCAP_DLT_SLIP_BSDOS 13 /* BSD/OS Serial Line IP */
#define PCAP_DLT_PPP_BSDOS 14 /* BSD/OS Point-to-point Protocol */
/* tcpdump file header */
#define TCPDUMP_MAGIC 0xa1b2c3d4
struct dump_file_header {
u_int magic;
u_short version_major;
u_short version_minor;
int thiszone; /* gmt to local correction */
u_int sigfigs; /* accuracy of timestamps */
u_int snaplen; /* max length saved portion of each pkt */
u_int linktype; /* data link type (PCAP_DLT_*) */
};
/*
* Each packet in the dump file is prepended with this generic header.
* This gets around the problem of different headers for different
* packet interfaces.
*/
struct packet_header {
u_int ts_secs; /* time stamp -- seconds */
u_int ts_usecs; /* time stamp -- useconds */
u_int caplen; /* length of portion present */
u_int len; /* length of this packet (off wire) */
};
#ifdef BY_HAND
static void
swap_hdr(struct dump_file_header *pdfh)
{
pdfh->version_major = SWAPSHORT(pdfh->version_major);
pdfh->version_minor = SWAPSHORT(pdfh->version_minor);
pdfh->thiszone = SWAPLONG(pdfh->thiszone);
pdfh->sigfigs = SWAPLONG(pdfh->sigfigs);
pdfh->snaplen = SWAPLONG(pdfh->snaplen);
pdfh->linktype = SWAPLONG(pdfh->linktype);
}
static void
swap_phdr(struct packet_header *pph)
{
pph->caplen = SWAPLONG(pph->caplen);
pph->len = SWAPLONG(pph->len);
pph->ts_secs = SWAPLONG(pph->ts_secs);
pph->ts_usecs = SWAPLONG(pph->ts_usecs);
}
#endif /* BY_HAND */
/* (Courtesy Jeffrey Semke, Pittsburgh Supercomputing Center) */
/* locate ip within FDDI according to RFC 1188 */
static int find_ip_fddi(char* buf, int iplen) {
char* ptr, *ptr2;
int i;
u_char pattern[] = {0xAA, 0x03, 0x00, 0x00, 0x00, 0x08, 0x00};
#define FDDIPATTERNLEN 7
ptr = ptr2 = buf;
for (i=0; i < FDDIPATTERNLEN; i++) {
ptr2 = memchr(ptr,pattern[i],(iplen - (int)(ptr - buf)));
if (!ptr2)
return (-1);
if (i && (ptr2 != ptr)) {
ptr2 = ptr2 - i - 1;
i = -1;
}
ptr = ptr2 + 1;
}
return (ptr2 - buf + 1);
}
/* This function determine the offset for the IP packet in an Ethernet frame */
/* We handle two cases : straight Ethernet encapsulation or PPPoE encapsulation */
/* Written by Yann Samama ([email protected]) on july 18th, 2003 */
static int find_ip_eth(char* buf)
{
unsigned short ppp_proto_type; /* the protocol type field of the PPP header */
unsigned short eth_proto_type; /* the protocol type field of the Ethernet header */
int offset = -1; /* the calculated offset that this function will return */
memcpy(ð_proto_type, buf+12, 2);
eth_proto_type = ntohs(eth_proto_type);
switch (eth_proto_type)
{
case ETHERTYPE_IPV6: /* it's pure IPv6 over ethernet */
offset = 14;
break;
case ETHERTYPE_IP: /* it's pure IPv4 over ethernet */
offset = 14;
break;
case ETHERTYPE_PPPOE_SESSION: /* it's a PPPoE session */
memcpy(&ppp_proto_type, buf+20, 2);
ppp_proto_type = ntohs(ppp_proto_type);
if (ppp_proto_type == 0x0021) /* it's IP over PPPoE */
offset = PPPOE_SIZE;
break;
default: /* well, this is not an IP packet */
offset = -1;
break;
}
return offset;
}
/* This function determine the offset for the IP packet in a PPP or HDLC PPP frame */
/* Written by Yann Samama ([email protected]) on june 19th, 2003 */
static int find_ip_ppp(char* buf)
{
unsigned char ppp_byte0; /* the first byte of the PPP frame */
unsigned short ppp_proto_type; /* the protocol type field of the PPP header */
int offset = -1; /* the calculated offset that this function will return */
memcpy(&ppp_byte0, buf, 1);
switch (ppp_byte0)
{
case 0xff: /* It is HDLC PPP encapsulation (2 bytes for HDLC and 2 bytes for PPP) */
memcpy(&ppp_proto_type, buf+2, 2);
ppp_proto_type = ntohs(ppp_proto_type);
if (ppp_proto_type == 0x21) /* That means HDLC PPP is encapsulating IP */
offset = 4;
else /* That means PPP is *NOT* encapsulating IP */
offset = -1;
break;
case 0x21: /* It is raw PPP encapsulation of IP with compressed (1 byte) protocol field */
offset = 1;
break;
case 0x00: /* It is raw PPP encapsulation */
memcpy(&ppp_proto_type, buf, 2);
ppp_proto_type = ntohs(ppp_proto_type);
if (ppp_proto_type == 0x21) /* It is raw PPP encapsulation of IP with uncompressed (2 bytes) protocol field */
offset = 2;
else /* That means PPP is *NOT* encapsulating IP */
offset = -1;
break;
default: /* There is certainly not an IP packet there ...*/
offset = -1;
break;
}
return offset;
}