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PCAP helper library with POSIX threads support and transport layer callbacks
  • C 65.1%
  • Shell 21.4%
  • M4 11.3%
  • Makefile 2.2%
2026年03月22日 11:07:53 +01:00
.builds CI updates 2025年09月10日 11:30:37 +02:00
.forgejo/workflows actions 2026年03月22日 11:04:14 +01:00
hexdump scan-build 2025年09月10日 16:53:22 +02:00
m4 autotools, fopen, ftell 2025年06月11日 17:15:50 +02:00
.clang-format Update code format 2017年08月16日 14:48:05 +02:00
.gitignore Remove bad-packets and scapy as a submodule, was bloating dist too much 2017年12月15日 15:56:43 +01:00
CHANGES Release 4.2.0 2025年08月25日 17:05:23 +02:00
fmt.sh Dispatch, error, hexdump, format 2023年02月03日 16:10:17 +01:00
LICENSE Release 4.1.0 2025年04月15日 15:42:06 +02:00
pcap_thread.c Error handling, open offline 2025年08月22日 14:55:11 +02:00
pcap_thread.h Release 4.2.0 2025年08月25日 17:05:23 +02:00
pcap_thread_ext_frag.c Release 4.1.0 2025年04月15日 15:42:06 +02:00
pcap_thread_ext_frag.h Release 4.1.0 2025年04月15日 15:42:06 +02:00
README.md Migrate to Codeberg 2025年09月02日 15:38:57 +02:00

pcap-thread

PCAP helper library with POSIX threads support and transport layer callbacks

About

This is a helper library that will initialize the pcap_t for you and, if you have support, launch a thread per pcap_t for the collection which is then feeded back to the main thread using a queue before being passed on to the callback.

Additional callbacks exists for simplifying the handling of various transport layers, based on pcap_layers by Duane Wessels (The Measurement Factory, Inc.), such as ether, VLAN, IP, IPv4, IPv6, GRE tunnels, UDP and TCP.

Usage

Here is a short example how to use this helper, see the hexdump directory for a more complete example.

#include "config.h"#include "pcap-thread/pcap_thread.h"
void callback(u_char* user, const struct pcap_pkthdr* packet_header, const u_char* packet, int datalink_type) {
 ...
}
int main(void) {
 pcap_thread_t pt = PCAP_THREAD_T_INIT;
 pcap_thread_set_snaplen(&pt, 65535);
 pcap_thread_set_filter(&pt, "port 80", 7);
 pcap_thread_set_callback(&pt, callback);
 pcap_thread_open(&pt, "eth0", 0);
 pcap_thread_open(&pt, "lo", 0);
 pcap_thread_run(&pt);
 pcap_thread_close(&pt);
 return 0;
}

git submodule

git submodule init
git submodule add https://codeberg.org/DNS-OARC/pcap-thread.git src/pcap-thread
git submodule update --init --recursive

auto(re)conf

autoreconf ... --include=src/pcap-thread/m4

configure.ac

AX_PCAP_THREAD

Top level Makefile.am

ACLOCAL_AMFLAGS = ... -I src/pcap-thread/m4

Makefile.am

AM_CFLAGS += $(PTHREAD_CFLAGS)
AM_CPPFLAGS += $(PTHREAD_CFLAGS)
AM_CXXFLAGS += $(PTHREAD_CFLAGS)
program_SOURCES += pcap-thread/pcap-thread.c
dist_program_SOURCES += pcap-thread/pcap-thread.h
program_LDADD += $(PTHREAD_LIBS)

Author(s)

Jerry Lundström jerry@dns-oarc.net

Copyright and license

Copyright (c) 2016-2025 OARC, Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

  3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.