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Obtained from: ftp://ftp.ee.lbl.gov/libpcap.tar.Z on 19-Aug-1996. |
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bpf/net | ||
lbl | ||
aclocal.m4 | ||
bpf_image.c | ||
CHANGES | ||
config.guess | ||
config.sub | ||
configure | ||
configure.in | ||
etherent.c | ||
ethertype.h | ||
FILES | ||
gencode.c | ||
gencode.h | ||
grammar.y | ||
inet.c | ||
INSTALL | ||
install-sh | ||
Makefile.in | ||
mkdep | ||
nametoaddr.c | ||
optimize.c | ||
pcap-bpf.c | ||
pcap-dlpi.c | ||
pcap-enet.c | ||
pcap-int.h | ||
pcap-namedb.h | ||
pcap-nit.c | ||
pcap-nit.h | ||
pcap-null.c | ||
pcap-pf.c | ||
pcap-pf.h | ||
pcap-snit.c | ||
pcap-snoop.c | ||
pcap.3 | ||
pcap.c | ||
pcap.h | ||
README | ||
savefile.c | ||
scanner.l | ||
VERSION |
@(#) $Header: README,v 1.15 96/07/07 22:38:34 leres Exp $ (LBL) LIBPCAP 0.2.1 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