pcap 2.4.0

mod capture;

use std::ops::Add;
use std::path::Path;

use pcap::{Activated, Capture, Offline, Packet, PacketHeader};

#[cfg(not(windows))]
#[allow(non_camel_case_types)]
type time_t = libc::time_t;
#[cfg(windows)]
#[allow(non_camel_case_types)]
type time_t = libc::c_long;

#[cfg(not(windows))]
#[allow(non_camel_case_types)]
type suseconds_t = libc::suseconds_t;
#[cfg(windows)]
#[allow(non_camel_case_types)]
type suseconds_t = libc::c_long;

fn capture_from_test_file(file_name: &str) -> Capture<Offline> {
    let path = Path::new("tests/data/").join(file_name);
    Capture::from_file(path).unwrap()
}

#[derive(Clone)]
pub struct Packets {
    headers: Vec<PacketHeader>,
    data: Vec<Vec<u8>>,
}

impl Default for Packets {
    fn default() -> Self {
        Self::new()
    }
}

impl Packets {
    pub fn new() -> Packets {
        Packets {
            headers: vec![],
            data: vec![],
        }
    }

    pub fn push(
        &mut self,
        tv_sec: time_t,
        tv_usec: suseconds_t,
        caplen: u32,
        len: u32,
        data: &[u8],
    ) {
        self.headers.push(PacketHeader {
            ts: libc::timeval { tv_sec, tv_usec },
            caplen,
            len,
        });
        self.data.push(data.to_vec());
    }

    pub fn foreach<F: FnMut(&Packet)>(&self, mut f: F) {
        for (header, data) in self.headers.iter().zip(self.data.iter()) {
            let packet = Packet::new(header, data);
            f(&packet);
        }
    }

    pub fn verify<T: Activated + ?Sized>(&self, cap: &mut Capture<T>) {
        for (header, data) in self.headers.iter().zip(self.data.iter()) {
            assert_eq!(cap.next_packet().unwrap(), Packet::new(header, data));
        }
        assert!(cap.next_packet().is_err());
    }
}

impl<'a> Add for &'a Packets {
    type Output = Packets;

    fn add(self, rhs: &'a Packets) -> Packets {
        let mut packets = self.clone();
        packets.headers.extend(rhs.headers.iter());
        packets.data.extend(rhs.data.iter().cloned());
        packets
    }
}

#[test]
#[cfg(not(windows))]
fn test_raw_fd_api() {
    use std::fs::File;
    use std::io;
    use std::io::prelude::*;
    use std::os::unix::io::{FromRawFd, RawFd};
    use std::thread;

    use tempfile::TempDir;

    use pcap::Linktype;
    use pcap::{Error, Precision};

    // Create a total of more than 64K data (> max pipe buf size)
    const N_PACKETS: usize = 64;
    let data: Vec<u8> = (0..191).cycle().take(N_PACKETS * 1024).collect();
    let mut packets = Packets::new();
    for i in 0..N_PACKETS {
        packets.push(
            1460408319 + i as time_t,
            1000 + i as suseconds_t,
            1024,
            1024,
            &data[i * 1024..(i + 1) * 1024],
        );
    }

    let dir = TempDir::new().unwrap();
    let tmpfile = dir.path().join("test.pcap");

    // Write all packets to test.pcap savefile
    let cap = Capture::dead(Linktype(1)).unwrap();
    let mut save = cap.savefile(&tmpfile).unwrap();
    packets.foreach(|p| save.write(p));
    drop(save);

    assert_eq!(
        unsafe { Capture::from_raw_fd(-999) }.err().unwrap(),
        Error::InvalidRawFd
    );
    #[cfg(libpcap_1_5_0)]
    {
        assert_eq!(
            unsafe { Capture::from_raw_fd_with_precision(-999, Precision::Micro) }
                .err()
                .unwrap(),
            Error::InvalidRawFd
        );
    }
    assert_eq!(
        unsafe { cap.savefile_raw_fd(-999) }.err().unwrap(),
        Error::InvalidRawFd
    );

    // Create an unnamed pipe
    let mut pipe = [0 as libc::c_int; 2];
    assert_eq!(unsafe { libc::pipe(pipe.as_mut_ptr()) }, 0);
    let (fd_in, fd_out) = (pipe[0], pipe[1]);

    let filename = dir.path().join("test2.pcap");
    let packets_c = packets.clone();
    let pipe_thread = thread::spawn(move || {
        // Write all packets to the pipe
        let cap = Capture::dead(Linktype(1)).unwrap();
        let mut save = unsafe { cap.savefile_raw_fd(fd_out) }.unwrap();
        packets_c.foreach(|p| save.write(p));
        // fd_out will be closed by savefile destructor
    });

    // Save the pcap from pipe in a separate thread.
    // Hypothetically, we could do any sort of processing here,
    // like encoding to a gzip stream.
    let mut file_in = unsafe { File::from_raw_fd(fd_in) };
    let mut file_out = File::create(filename).unwrap();
    io::copy(&mut file_in, &mut file_out).unwrap();

    // Verify that the contents match
    let filename = dir.path().join("test2.pcap");
    let (mut v1, mut v2) = (vec![], vec![]);
    File::open(&tmpfile).unwrap().read_to_end(&mut v1).unwrap();
    File::open(filename).unwrap().read_to_end(&mut v2).unwrap();
    assert_eq!(v1, v2);

    // Join thread.
    pipe_thread.join().unwrap();

    #[cfg(libpcap_1_5_0)]
    unsafe fn from_raw_fd_with_precision(fd: RawFd, precision: Precision) -> Capture<Offline> {
        Capture::from_raw_fd_with_precision(fd, precision).unwrap()
    }

    #[cfg(not(libpcap_1_5_0))]
    unsafe fn from_raw_fd_with_precision(fd: RawFd, _: Precision) -> Capture<Offline> {
        Capture::from_raw_fd(fd).unwrap()
    }

    for with_tstamp in &[false, true] {
        // Create an unnamed pipe
        let mut pipe = [0 as libc::c_int; 2];
        assert_eq!(unsafe { libc::pipe(pipe.as_mut_ptr()) }, 0);
        let (fd_in, fd_out) = (pipe[0], pipe[1]);

        let filename = tmpfile.clone();
        let pipe_thread = thread::spawn(move || {
            // Cat the pcap into the pipe in a separate thread.
            // Hypothetically, we could do any sort of processing here,
            // like decoding from a gzip stream.
            let mut file_in = File::open(&filename).unwrap();
            let mut file_out = unsafe { File::from_raw_fd(fd_out) };
            io::copy(&mut file_in, &mut file_out).unwrap();
        });

        // Open the capture with pipe's file descriptor
        let mut cap = if *with_tstamp {
            unsafe { from_raw_fd_with_precision(fd_in, Precision::Micro) }
        } else {
            unsafe { Capture::from_raw_fd(fd_in) }.unwrap()
        };

        // Verify that packets match
        packets.verify(&mut cap);

        // Join thread.
        pipe_thread.join().unwrap();
    }
}