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the LIBpcap interface to various kernel packet capture mechanism
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ChmodBPF To quote
SUNOS4 Initial revision
Win32 Delete trailing spaces/tabs
bpf/net Give credit to Ani Sinha
doc Delete trailing spaces/tabs
lbl Fix a warning for 'ffs' function on AIX7.
missing remove libpcap's own CVS keywords
msdos Delete trailing spaces/tabs
pcap Delete trailing spaces/tabs
tests Add a test for pcap_can_set_rfmon().
.gitignore Add some more files.
.travis-coverity-scan-build.sh Coverity: build script: Update the download URL of 7.6 release
.travis.yml Travis: add 'make install' in the build script
CHANGES Add changes for 1.7.3.
CREDITS Delete trailing spaces/tabs
INSTALL.txt Delete trailing spaces/tabs
LICENSE Delete trailing spaces/tabs
Makefile-devel-adds The configure script depends on aclocal.m4.
Makefile.in scanner.c.top might not be in the current directory; look in $(srcdir).
README Delete trailing spaces/tabs
README.Win32 Delete trailing spaces/tabs
README.aix Delete trailing spaces/tabs
README.dag Update README.dag to cover the ERF_DONT_STRIP_FCS environment variable.
README.hpux Delete trailing spaces/tabs
README.linux Delete trailing spaces/tabs
README.macosx Put in a note about the Snow Leopard bug that requires that you have BPF
README.septel Delete trailing spaces/tabs
README.sita The SITA code in pcap-linux.c shares very little with the Linux code;
README.tru64 Delete trailing spaces/tabs
TODO Delete trailing spaces/tabs
VERSION This is the trunk, and there's a 1.7.x branch, so call it 1.8.0-PRE-GIT.
aclocal.m4 Delete trailing spaces/tabs
arcnet.h remove libpcap's own CVS keywords
atmuni31.h remove libpcap's own CVS keywords
bpf_dump.c remove libpcap's own CVS keywords
bpf_image.c Support mod and XOR operators.
chmod_bpf Add a script to change the permissions of /dev/bpf*, and a launchd plist
config.guess Update config.{sub,guess}, timestamp='2015-02-2[23]'
config.h.in Work around a Linux bonding driver bug.
config.sub Update config.{sub,guess}, timestamp='2015-02-2[23]'
configure Fix check for <linux/if_bonding.h>.
configure.in Fix check for <linux/if_bonding.h>.
dlpisubs.c remove libpcap's own CVS keywords
dlpisubs.h remove libpcap's own CVS keywords
etherent.c remove libpcap's own CVS keywords
ethertype.h remove libpcap's own CVS keywords
fad-getad.c Fix/update some comments.
fad-gifc.c Delete trailing spaces/tabs
fad-glifc.c Don't exclude interfaces that aren't up.
fad-null.c remove libpcap's own CVS keywords
fad-sita.c remove libpcap's own CVS keywords
fad-win32.c Delete trailing spaces/tabs
gencode.c Check for division or modulus by zero at code generation time.
gencode.h Delete trailing spaces/tabs
grammar.y Delete trailing spaces/tabs
ieee80211.h Support OpenBSD's "addr1", "addr2", "addr3", and "addr4" link-layer
inet.c Don't add null addresses to the address list.
install-sh install-sh: Restore a needed tab
llc.h Add support for filters testing for 802.2 LLC frame types.
mkdep mkdep: It uses now build environment PATH
nametoaddr.c remove libpcap's own CVS keywords
nlpid.h remove libpcap's own CVS keywords
optimize.c issue: #319
org.tcpdump.chmod_bpf.plist This is probably the right way to run something once at startup time; it
pcap-bpf.c Delete trailing spaces/tabs
pcap-bpf.h Delete trailing spaces/tabs
pcap-bt-linux.c Delete trailing spaces/tabs
pcap-bt-linux.h Delete trailing spaces/tabs
pcap-bt-monitor-linux.c Bluetooth Linux Monitor: fix three warnings
pcap-bt-monitor-linux.h Add support for Bluetooth Linux Monitor interface
pcap-can-linux.c Linux support for CANbus: fix a Coverity warning
pcap-can-linux.h Have non-interface modules take responsibility for identifying their …
pcap-canusb-linux.c Delete trailing spaces/tabs
pcap-canusb-linux.h added missing ( to pcap-canusb-linux.h
pcap-common.c Delete trailing spaces/tabs
pcap-common.h Byte-swap the T and L in TLVs as necessary when reading an NFLOG file.
pcap-config.1 pcap-config.1 isn't generated.
pcap-config.in Use config.status to generate pcap-config.
pcap-dag.c Use pcap_close() if pcap_create_handle() fails.
pcap-dag.h remove libpcap's own CVS keywords
pcap-dbus.c Delete trailing spaces/tabs
pcap-dbus.h Add a pcap-dbus.h header and include it in pcap-dbus.c and pcap.c.
pcap-dlpi.c Delete trailing spaces/tabs
pcap-dos.c Delete trailing spaces/tabs
pcap-dos.h Delete trailing spaces/tabs
pcap-enet.c remove libpcap's own CVS keywords
pcap-filter.manmisc.in Don't talk about the shell.
pcap-int.h Move the socket ops out of gencode.c.
pcap-libdlpi.c In activate routines, don't set status unless a warning or error occurs.
pcap-linktype.manmisc.in refresh last midification dates for some man pages
pcap-linux.c Use pcap_close() if pcap_create_handle() fails.
pcap-namedb.h remove libpcap's own CVS keywords
pcap-netfilter-linux.c Delete trailing spaces/tabs
pcap-netfilter-linux.h Delete trailing spaces/tabs
pcap-nit.c Delete trailing spaces/tabs
pcap-null.c remove libpcap's own CVS keywords
pcap-pf.c Delete trailing spaces/tabs
pcap-savefile.manfile.in Delete trailing spaces/tabs
pcap-septel.c Delete trailing spaces/tabs
pcap-septel.h remove libpcap's own CVS keywords
pcap-sita.c Delete trailing spaces/tabs
pcap-sita.h remove libpcap's own CVS keywords
pcap-sita.html Again, Git, not CVS.
pcap-snf.c Use pcap_close() if pcap_create_handle() fails.
pcap-snf.h Have non-interface modules take responsibility for identifying their …
pcap-snit.c Delete trailing spaces/tabs
pcap-snoop.c Delete trailing spaces/tabs
pcap-stdinc.h Update pcap-stdinc.h
pcap-tstamp.manmisc.in Delete trailing spaces/tabs
pcap-usb-linux.c Delete trailing spaces/tabs
pcap-usb-linux.h Delete trailing spaces/tabs
pcap-win32.c Delete trailing spaces/tabs
pcap.3pcap.in Delete trailing spaces/tabs
pcap.c Fix the pcap_create() versions for specialized builds.
pcap.h remove libpcap's own CVS keywords
pcap_activate.3pcap refresh last midification dates for some man pages
pcap_breakloop.3pcap Delete trailing spaces/tabs
pcap_can_set_rfmon.3pcap remove libpcap's own CVS keywords
pcap_close.3pcap remove libpcap's own CVS keywords
pcap_compile.3pcap.in refresh last midification dates for some man pages
pcap_create.3pcap remove libpcap's own CVS keywords
pcap_datalink.3pcap.in refresh last midification dates for some man pages
pcap_datalink_name_to_val.3pcap Correct return value documentation in manpages.
pcap_datalink_val_to_name.3pcap remove libpcap's own CVS keywords
pcap_dump.3pcap Delete trailing spaces/tabs
pcap_dump_close.3pcap remove libpcap's own CVS keywords
pcap_dump_file.3pcap remove libpcap's own CVS keywords
pcap_dump_flush.3pcap remove libpcap's own CVS keywords
pcap_dump_ftell.3pcap remove libpcap's own CVS keywords
pcap_dump_open.3pcap.in Fix documentation.
pcap_file.3pcap remove libpcap's own CVS keywords
pcap_fileno.3pcap refresh last midification dates for some man pages
pcap_findalldevs.3pcap refresh last midification dates for some man pages
pcap_freecode.3pcap remove libpcap's own CVS keywords
pcap_get_selectable_fd.3pcap Be more emphatic that a read timeout may cause no packets to be read.
pcap_get_tstamp_precision.3pcap.in Formatting tweak.
pcap_geterr.3pcap remove libpcap's own CVS keywords
pcap_inject.3pcap remove libpcap's own CVS keywords
pcap_is_swapped.3pcap refresh last midification dates for some man pages
pcap_lib_version.3pcap remove libpcap's own CVS keywords
pcap_list_datalinks.3pcap.in Delete trailing spaces/tabs
pcap_list_tstamp_types.3pcap.in Add support for setting the time stamp type for a capture.
pcap_lookupdev.3pcap remove libpcap's own CVS keywords
pcap_lookupnet.3pcap remove libpcap's own CVS keywords
pcap_loop.3pcap Be more emphatic that a read timeout may cause no packets to be read.
pcap_major_version.3pcap refresh last midification dates for some man pages
pcap_next_ex.3pcap refresh last midification dates for some man pages
pcap_offline_filter.3pcap refresh last midification dates for some man pages
pcap_open_dead.3pcap.in remove libpcap's own CVS keywords
pcap_open_live.3pcap remove libpcap's own CVS keywords
pcap_open_offline.3pcap.in remove libpcap's own CVS keywords
pcap_set_buffer_size.3pcap remove libpcap's own CVS keywords
pcap_set_datalink.3pcap remove libpcap's own CVS keywords
pcap_set_immediate_mode.3pcap Fix typo in pcap_set_immediate_mode manpage
pcap_set_promisc.3pcap remove libpcap's own CVS keywords
pcap_set_rfmon.3pcap remove libpcap's own CVS keywords
pcap_set_snaplen.3pcap remove libpcap's own CVS keywords
pcap_set_timeout.3pcap last modification date
pcap_set_tstamp_precision.3pcap.in Fix copy-and-pasteo.
pcap_set_tstamp_type.3pcap.in Correct return value documentation in manpages.
pcap_setdirection.3pcap Delete trailing spaces/tabs
pcap_setfilter.3pcap refresh last midification dates for some man pages
pcap_setnonblock.3pcap Be more emphatic that a read timeout may cause no packets to be read.
pcap_snapshot.3pcap refresh last midification dates for some man pages
pcap_stats.3pcap remove libpcap's own CVS keywords
pcap_statustostr.3pcap remove libpcap's own CVS keywords
pcap_strerror.3pcap remove libpcap's own CVS keywords
pcap_tstamp_type_name_to_val.3pcap Correct return value documentation in manpages.
pcap_tstamp_type_val_to_name.3pcap tweak manpages formatting
ppp.h remove libpcap's own CVS keywords
runlex.sh Delete trailing spaces/tabs
savefile.c Delete trailing spaces/tabs
scanner.c.top Move the inclusion of config.h to the top of scanner.c
scanner.l Add support for Geneve (Generic Network Virtualization Encapsulation).
sf-pcap-ng.c Delete trailing spaces/tabs
sf-pcap-ng.h Replace the _nsectime routines with _with_tstamp_precision routines.
sf-pcap.c Delete trailing spaces/tabs
sf-pcap.h Replace the _nsectime routines with _with_tstamp_precision routines.
sunatmpos.h remove libpcap's own CVS keywords

README

LIBPCAP 1.x.y

www.tcpdump.org

Please send inquiries/comments/reports to:
	tcpdump-workers@lists.tcpdump.org

Anonymous Git is available via:
	git clone git://bpf.tcpdump.org/libpcap

Please submit patches by forking the branch on GitHub at

	http://github.com/the-tcpdump-group/libpcap/tree/master

and issuing a pull request.

formerly from 	Lawrence Berkeley National Laboratory
		Network Research Group <libpcap@ee.lbl.gov>
		ftp://ftp.ee.lbl.gov/old/libpcap-0.4a7.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.

For some platforms there are README.{system} files that discuss issues
with the OS's interface for packet capture on those platforms, such as
how to enable support for that interface in the OS, if it's not built in
by default.

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 can be
found at

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

or

	http://www.tcpdump.org/papers/bpf-usenix93.ps.Z

and a gzipped version can be found at

	http://www.tcpdump.org/papers/bpf-usenix93.ps.gz

A PDF version can be found at

	http://www.tcpdump.org/papers/bpf-usenix93.pdf

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/OS, NetBSD, FreeBSD, OpenBSD, DragonFly
BSD, and Mac OS X; an older, modified and undocumented version is
standard in AIX.  {DEC OSF/1, Digital UNIX, Tru64 UNIX} 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:

	http://www.tcpdump.org/other/bpfext42.tar.Z

Linux, in the 2.2 kernel and later kernels, has a "Socket Filter"
mechanism that accepts BPF filters; see the README.linux file for
information on configuring that option.

Note to Linux distributions and *BSD systems that include libpcap:

There's now a rule to make a shared library, which should work on Linux
and *BSD, among other platforms.

It sets the soname of the library to "libpcap.so.1"; this is what it
should be, *NOT* libpcap.so.1.x or libpcap.so.1.x.y or something such as
that.

We've been maintaining binary compatibility between libpcap releases for
quite a while; there's no reason to tie a binary linked with libpcap to
a particular release of libpcap.

Problems, bugs, questions, desirable enhancements, etc. should be sent
to the address "tcpdump-workers@lists.tcpdump.org".  Bugs, support
requests, and feature requests may also be submitted on the GitHub issue
tracker for libpcap at

	https://github.com/the-tcpdump-group/libpcap/issues

Source code contributions, etc. should be sent to the email address
above or submitted by forking the branch on GitHub at

	http://github.com/the-tcpdump-group/libpcap/tree/master

and issuing a pull request.

Current versions can be found at www.tcpdump.org.

 - The TCPdump team
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