| commit | e93f0844776997acb866f1b1163d96ff0c6f441f | [log] [tgz] |
|---|---|---|
| author | Francois-Xavier Le Bail <[email protected]> | Fri Oct 28 15:12:45 2022 +0200 |
| committer | Francois-Xavier Le Bail <[email protected]> | Fri Oct 28 15:35:12 2022 +0200 |
| tree | b6d04b157c3ebaab483cf2628e460552939f3418 | |
| parent | 40e07f298bd64f6a09dd076c3def02445ecfe5df [diff] |
Use "git archive" for the "make releasetar" process Use the release tag if it exists or use HEAD. Remove the "autoreconf -f" command, because it changes the configure file locally in an uncontrolled way (runstatedir, #define LARGE_OFF_T, etc.) depending on the autoconf version. This command is run in the release process before a commit and we can choose the parts that will be added in the commit. Note: The following target (rcX) must be updated ou removed in a next step because it was using "autoreconf -f" (via "make releasetar") and it changes the VERSION and configure files locally. This change 1) Ensures that we only release files from tag/HEAD, not locally modified ones. 2) Avoids disclosing personal data such as the username/group of the local user. 3) Puts by default a umask of 0002, which turns off the world write bit on files in the archive. 4) Avoids problems on some OSes (no more tar, Git builtin tar.gz handling). (cherry picked from commit 563c8a2caf64dde3818b5483d792561cd5b0b428)
To report a security issue please send an e-mail to [email protected].
To report bugs and other problems, contribute patches, request a feature, provide generic feedback etc please see the guidelines for contributing.
The documentation directory has README files about specific operating systems and options.
Anonymous Git is available via:
https://github.com/the-tcpdump-group/libpcap.git
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.
formerly from Lawrence Berkeley National Laboratory Network Research Group <libpcap@ee.lbl.gov> ftp://ftp.ee.lbl.gov/old/libpcap-0.4a7.tar.Z
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'' (compressed PostScript, gzipped PostScript, 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, macOS, and Solaris 11; 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).
Linux has a number of BPF based systems, and libpcap does not support any of the eBPF mechanisms as yet, although it supports many of the memory mapped receive mechanisms. See the Linux-specific README for more information.
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.