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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| use std::fmt; | ||
| use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr}; | ||
|
|
||
| use crate::ffi::pfvar::pfsync_state_host; | ||
| use crate::{ffi::pfvar::pfsync_state, Direction, Proto}; | ||
| use crate::{Error, ErrorInternal, Result}; | ||
|
|
||
| /// PF connection state created by a stateful rule | ||
| #[derive(Clone)] | ||
| pub struct State { | ||
| sync_state: pfsync_state, | ||
| } | ||
|
|
||
| // Manually derive `Debug` since `pfsync_state` contains unions. | ||
| impl fmt::Debug for State { | ||
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| f.debug_struct("State") | ||
| .field("direction", &self.direction()) | ||
| .field("proto", &self.proto()) | ||
| .field("local_address", &self.local_address()) | ||
| .field("remote_address", &self.remote_address()) | ||
| .finish() | ||
| } | ||
| } | ||
|
|
||
| impl State { | ||
| /// Wrap a `pfsync_state` so that it can be accessed safely. | ||
| /// | ||
| /// # Safety | ||
| /// | ||
| /// All bytes in `sync_state` must be initialized. | ||
| pub(crate) unsafe fn new(sync_state: pfsync_state) -> State { | ||
| State { sync_state } | ||
| } | ||
|
|
||
| /// Return the direction for this state | ||
| pub fn direction(&self) -> Result<Direction> { | ||
| Direction::try_from(self.sync_state.direction) | ||
| } | ||
|
|
||
| /// Return the transport protocol for this state | ||
| pub fn proto(&self) -> Result<Proto> { | ||
| Proto::try_from(self.sync_state.proto) | ||
| } | ||
|
|
||
| /// Return the local socket address for this state | ||
| pub fn local_address(&self) -> Result<SocketAddr> { | ||
| // SAFETY: The address and port are initialized according to the contract of `Self::new`. | ||
| unsafe { parse_address(self.sync_state.af_lan, self.sync_state.lan) } | ||
| } | ||
|
|
||
| /// Return the remote socket address for this state | ||
| pub fn remote_address(&self) -> Result<SocketAddr> { | ||
| // SAFETY: The address and port are initialized according to the contract of `Self::new`. | ||
| unsafe { parse_address(self.sync_state.af_lan, self.sync_state.ext_lan) } | ||
| } | ||
|
|
||
| /// Return a reference to the inner `pfsync_state` state | ||
| pub(crate) fn as_raw(&self) -> &pfsync_state { | ||
| &self.sync_state | ||
| } | ||
| } | ||
|
|
||
| /// Parse an IP address and port from a `pfsync_sync_host`, normally provided by `pfsync_state`. | ||
| /// | ||
| /// # Safety | ||
| /// | ||
| /// `host` must contain a valid address and a port: | ||
| /// * If `family == PF_INET`, then `host.addr.pfa._v4addr` must be initialized. | ||
| /// * If `family == PF_INET6`, then `host.addr.pfa._v6addr` must be initialized. | ||
| /// * `host.xport.port` must always be initialized. | ||
| unsafe fn parse_address(family: u8, host: pfsync_state_host) -> Result<SocketAddr> { | ||
| let ip = match u32::from(family) { | ||
| crate::ffi::pfvar::PF_INET => { | ||
| // SAFETY: The caller has initialized this memory | ||
| Ipv4Addr::from(u32::from_be(unsafe { host.addr.pfa._v4addr.s_addr })).into() | ||
| } | ||
| crate::ffi::pfvar::PF_INET6 => { | ||
| // SAFETY: The caller has initialized this memory | ||
| Ipv6Addr::from(unsafe { host.addr.pfa._v6addr.__u6_addr.__u6_addr8 }).into() | ||
| } | ||
| _ => return Err(Error::from(ErrorInternal::InvalidAddressFamily(family))), | ||
| }; | ||
|
|
||
| // SAFETY: The caller has initialized this memory | ||
| let port = u16::from_be(unsafe { host.xport.port }); | ||
|
|
||
| Ok(SocketAddr::new(ip, port)) | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::pfsync_state_host; | ||
| use crate::{state::parse_address, AddrFamily}; | ||
| use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr}; | ||
|
|
||
| #[test] | ||
| fn test_parse_ipv4_address() { | ||
| const EXPECTED_IP: Ipv4Addr = Ipv4Addr::new(1, 2, 3, 4); | ||
| const EXPECTED_PORT: u16 = 12345; | ||
|
|
||
| let mut host: pfsync_state_host = unsafe { std::mem::zeroed() }; | ||
| host.addr.pfa._v4addr.s_addr = u32::from_be_bytes(EXPECTED_IP.octets()).to_be(); | ||
| host.xport.port = EXPECTED_PORT.to_be(); | ||
|
|
||
| let family = u8::from(AddrFamily::Ipv4); | ||
|
|
||
| let address = unsafe { parse_address(family, host) }.unwrap(); | ||
| assert_eq!(address, SocketAddr::new(EXPECTED_IP.into(), EXPECTED_PORT)); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_parse_ipv6_address() { | ||
| const EXPECTED_IP: Ipv6Addr = Ipv6Addr::new(1, 2, 3, 4, 5, 6, 7, 0x7f); | ||
| const EXPECTED_PORT: u16 = 12345; | ||
|
|
||
| let mut host: pfsync_state_host = unsafe { std::mem::zeroed() }; | ||
| host.addr.pfa._v6addr.__u6_addr.__u6_addr8 = EXPECTED_IP.octets(); | ||
| host.xport.port = EXPECTED_PORT.to_be(); | ||
|
|
||
| let family = u8::from(AddrFamily::Ipv6); | ||
|
|
||
| let address = unsafe { parse_address(family, host) }.unwrap(); | ||
| assert_eq!(address, SocketAddr::new(EXPECTED_IP.into(), EXPECTED_PORT)); | ||
| } | ||
| } |
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