NetBSD/lib/libpcap
pooka 9659091d7a Take descriptions for pcap_file() and pcap_fileno() from libpcap-current
man page. The previous descriptions were horribly wrong.
2003-01-07 16:51:20 +00:00
..
CHANGES
Makefile Don't override the definition of LEX. 2002-09-14 14:59:30 +00:00
README
bpf_image.c
etherent.c
ethertype.h Add support for VLAN (IEEE 802.1Q) frames. 2002-12-19 16:33:47 +00:00
gencode.c Add support for VLAN (IEEE 802.1Q) frames. 2002-12-19 16:33:47 +00:00
gencode.h Add support for VLAN (IEEE 802.1Q) frames. 2002-12-19 16:33:47 +00:00
gnuc.h
grammar.y Add support for VLAN (IEEE 802.1Q) frames. 2002-12-19 16:33:47 +00:00
inet.c
nametoaddr.c
optimize.c sync partly with tcpdump.org. ok'ed by itojun 2002-08-26 11:21:18 +00:00
pcap-bpf.c Open the BPF file descriptor as read-write. Some pcap-using programs 2002-10-19 22:03:44 +00:00
pcap-int.h * Add support for DLT_IEEE802_11. 2002-09-22 16:13:01 +00:00
pcap-namedb.h
pcap.3 Take descriptions for pcap_file() and pcap_fileno() from libpcap-current 2003-01-07 16:51:20 +00:00
pcap.c * Add support for DLT_IEEE802_11. 2002-09-22 16:13:01 +00:00
pcap.h * Add support for DLT_IEEE802_11. 2002-09-22 16:13:01 +00:00
pcap2netbsd
ppp.h
savefile.c
scanner.l Add support for VLAN (IEEE 802.1Q) frames. 2002-12-19 16:33:47 +00:00
shlib_version * Add support for DLT_IEEE802_11. 2002-09-22 16:13:01 +00:00
version.c

README

$NetBSD: README,v 1.4 1997/10/03 15:53:01 christos Exp $
@(#) Header: README,v 1.18 97/06/12 14:23:56 leres Exp  (LBL)

LIBPCAP 0.4
Lawrence Berkeley National Laboratory
Network Research Group
libpcap@ee.lbl.gov
ftp://ftp.ee.lbl.gov/libpcap.tar.Z

This directory contains source code for libpcap, a system-independent
interface for user-level packet capture.  libpcap provides a portable
framework for low-level network monitoring.  Applications include
network statistics collection, security monitoring, network debugging,
etc.  Since almost every system vendor provides a different interface
for packet capture, and since we've developed several tools that
require this functionality, we've created this system-independent API
to ease in porting and to alleviate the need for several
system-dependent packet capture modules in each application.

Note well: this interface is new and is likely to change.

The libpcap interface supports a filtering mechanism based on the
architecture in the BSD packet filter.  BPF is described in the 1993
Winter Usenix paper ``The BSD Packet Filter: A New Architecture for
User-level Packet Capture''.  A compressed postscript version is in:

	ftp://ftp.ee.lbl.gov/papers/bpf-usenix93.ps.Z.

Although most packet capture interfaces support in-kernel filtering,
libpcap utilizes in-kernel filtering only for the BPF interface.
On systems that don't have BPF, all packets are read into user-space
and the BPF filters are evaluated in the libpcap library, incurring
added overhead (especially, for selective filters).  Ideally, libpcap
would translate BPF filters into a filter program that is compatible
with the underlying kernel subsystem, but this is not yet implemented.

BPF is standard in 4.4BSD, BSD/386, NetBSD, and FreeBSD.  DEC OSF/1
uses the packetfilter interface but has been extended to accept BPF
filters (which libpcap utilizes).  Also, you can add BPF filter support
to Ultrix using the kernel source and/or object patches available in:

	ftp://gatekeeper.dec.com/pub/DEC/net/bpfext42.tar.Z.

Problems, bugs, questions, desirable enhancements, source code
contributions, etc., should be sent to the email address
"libpcap@ee.lbl.gov".

 - Steve McCanne
   Craig Leres
   Van Jacobson