pcap

Documentation

This is a Rust language crate for accessing the packet sniffing capabilities of pcap (or wpcap on Windows). If you need anything feel free to post an issue or submit a pull request!

Features:

• List devices
• Open capture handle on a device or savefiles
• Get packets from the capture handle
• Filter packets using BPF programs
• List/set/get datalink link types
• Configure some parameters like promiscuity and buffer length
• Write packets to savefiles
• Inject packets into an interface

See examples for usage.

Building

Windows

Install WinPcap.

Place wpcap.dll in your C:\Rust\bin\rustlib\x86_64-pc-windows-gnu\lib\ directory on 64 bit or C:\Rust\bin\rustlib\i686-pc-windows-gnu\lib\ on 32 bit.

Linux

On Debian based Linux, install libpcap-dev. If not running as root, you need to set capabilities like so: sudo setcap cap_net_raw,cap_net_admin=eip path/to/bin

Mac OS X

libpcap should be installed on Mac OS X by default.

Note: A timeout of zero may cause pcap::Capture::next to hang and never return (because it waits for the timeout to expire before returning). This can be fixed by using a non-zero timeout (as the libpcap manual recommends) and calling pcap::Capture::next in a loop.

Library Location

If PCAP_LIBDIR environment variable is set when building the crate, it will be added to the linker search path - this allows linking against a specific libpcap.

Optional Features

tokio

Use the tokio feature to enable support for streamed packet captures.

[dependencies]
pcap = { version = "0.7", features = ["tokio"] }

pcap-savefile-append

To get access to the Capture::savefile_append function (which allows appending to an existing pcap file) you have to depend on the pcap-savefile-append feature flag. It requires at least libpcap version 1.7.2.

[dependencies]
pcap = { version = "0.7", features = ["pcap-savefile-append"] }

pcap-fopen-offline-precision

To enable Capture::from_raw_fd_with_precision constructor (which allows opening an offline capture from a raw file descriptor with a predefined timestamp precision) you have to add pcap-fopen-offline-precision feature flag. This requires libpcap version 1.5.0 or later.

[dependencies]
pcap = { version = "0.7", features = ["pcap-fopen-offline-precision"] }

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.