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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -26,6 +26,7 @@ pub enum MaybeString<T> | |
| where | ||
| T: Config, | ||
| { | ||
| #[cfg(feature = "libpcap")] | ||
| String(String), | ||
| Other(T), | ||
| } | ||
|
|
||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| use std::io; | ||
|
|
||
| use crate::config::RawNetConfig; | ||
| use pcap::{Capture, Device}; | ||
| use rd_interface::{Error, ErrorContext, Result}; | ||
| use tokio_smoltcp::{ | ||
| device::{AsyncDevice, DeviceCapabilities}, | ||
| smoltcp::{phy::Checksum, wire::IpCidr}, | ||
| }; | ||
|
|
||
| pub(super) fn get_filter(ip_cidr: &IpCidr) -> Option<String> { | ||
| match ip_cidr { | ||
| IpCidr::Ipv4(v4) => Some(format!("net {}", v4.network())), | ||
| _ => None, | ||
| } | ||
| } | ||
|
|
||
| pub(super) fn pcap_device_by_name(name: &str) -> Result<Device> { | ||
| let mut devices = Device::list().context("Failed to list device")?; | ||
|
|
||
| if let Some(id) = devices.iter().position(|d| d.name == name) { | ||
| Ok(devices.remove(id)) | ||
| } else { | ||
| Err(Error::Other( | ||
| format!("Failed to find device: {}", name,).into(), | ||
| )) | ||
| } | ||
| } | ||
|
|
||
| #[cfg(unix)] | ||
| pub(super) fn get_by_device( | ||
| device: Device, | ||
| filter: Option<String>, | ||
| config: &RawNetConfig, | ||
| ) -> Result<impl AsyncDevice> { | ||
| use tokio_smoltcp::device::AsyncCapture; | ||
|
|
||
| let mut cap = Capture::from_device(device) | ||
| .context("Failed to capture device")? | ||
| .promisc(true) | ||
| .immediate_mode(true) | ||
| .timeout(500) | ||
| .open() | ||
| .context("Failed to open device")?; | ||
|
|
||
| if let Some(filter) = filter { | ||
| cap.filter(&filter, true).context("Failed to add filter")?; | ||
| } | ||
|
|
||
| fn map_err(e: pcap::Error) -> io::Error { | ||
| match e { | ||
| pcap::Error::IoError(e) => e.into(), | ||
| pcap::Error::TimeoutExpired => io::ErrorKind::WouldBlock.into(), | ||
| other => io::Error::new(io::ErrorKind::Other, other), | ||
| } | ||
| } | ||
| let mut caps = DeviceCapabilities::default(); | ||
| caps.max_transmission_unit = config.mtu; | ||
| caps.checksum.ipv4 = Checksum::Tx; | ||
| caps.checksum.tcp = Checksum::Tx; | ||
| caps.checksum.udp = Checksum::Tx; | ||
| caps.checksum.icmpv4 = Checksum::Tx; | ||
| caps.checksum.icmpv6 = Checksum::Tx; | ||
|
|
||
| AsyncCapture::new( | ||
| cap.setnonblock().context("Failed to set nonblock")?, | ||
| |d| d.next().map_err(map_err).map(|p| p.to_vec()), | ||
| |d, pkt| d.sendpacket(pkt).map_err(map_err), | ||
| caps, | ||
| ) | ||
| .context("Failed to create async capture") | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
| use tokio_smoltcp::smoltcp::wire::Ipv4Address; | ||
|
|
||
| #[test] | ||
| fn test_get_filter() { | ||
| let filter = get_filter(&IpCidr::new(Ipv4Address::new(192, 168, 1, 1).into(), 24)); | ||
|
|
||
| assert_eq!(filter, Some("net 192.168.1.0/24".to_string())); | ||
| } | ||
| } |