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use crate::IphlpNetworkAdapterInfo;
use std::net::{Ipv4Addr, Ipv6Addr};
use windows::Win32::{
Foundation::ERROR_OBJECT_ALREADY_EXISTS,
NetworkManagement::IpHelper::{
CreateIpForwardEntry2, InitializeIpForwardEntry, MIB_IPFORWARD_ROW2,
},
Networking::WinSock::{
NlroManual, AF_INET, AF_INET6, IN6_ADDR, IN6_ADDR_0, MIB_IPPROTO_NT_STATIC,
},
};
impl IphlpNetworkAdapterInfo {
/// Adds a default IPv4 gateway to the network interface.
///
/// # Arguments
///
/// * `address`: Default gateway IPv4 address
///
/// # Returns
///
/// * `Option<MIB_IPFORWARD_ROW2>`: Some(MIB_IPFORWARD_ROW2) on success, None on failure
///
/// # Safety
///
/// This function calls unsafe Windows API functions (`InitializeIpForwardEntry`, `SetLastError`, and
/// `CreateIpForwardEntry2`). Make sure to handle errors and exceptions properly when using this function.
pub fn add_default_gateway_ipv4(&self, address: Ipv4Addr) -> Option<MIB_IPFORWARD_ROW2> {
let mut forward_row = MIB_IPFORWARD_ROW2::default();
unsafe { InitializeIpForwardEntry(&mut forward_row) };
forward_row.InterfaceIndex = self.if_index;
forward_row.InterfaceLuid = self.luid.into();
forward_row.DestinationPrefix.Prefix.si_family = AF_INET;
forward_row.DestinationPrefix.Prefix.Ipv4.sin_family = AF_INET;
forward_row.NextHop.si_family = AF_INET;
forward_row.NextHop.Ipv4.sin_family = AF_INET;
forward_row.NextHop.Ipv4.sin_addr.S_un.S_addr = u32::from_ne_bytes(address.octets());
forward_row.SitePrefixLength = 0;
forward_row.Metric = 1;
forward_row.Protocol = MIB_IPPROTO_NT_STATIC;
forward_row.Origin = NlroManual;
match unsafe { CreateIpForwardEntry2(&forward_row) }.ok() {
Ok(_) => Some(forward_row),
Err(err) => {
if err == ERROR_OBJECT_ALREADY_EXISTS.into() {
Some(forward_row)
} else {
None
}
}
}
}
/// Adds a default IPv6 gateway to the network interface.
///
/// # Arguments
///
/// * `address`: Default gateway IPv6 address
///
/// # Returns
///
/// * `Option<MIB_IPFORWARD_ROW2>`: Some(MIB_IPFORWARD_ROW2) on success, None on failure
///
/// # Safety
///
/// This function uses FFI to interact with the Windows API, specifically the `InitializeIpForwardEntry`,
/// `CreateIpForwardEntry2`, and `SetLastError` functions. It is the caller's responsibility to ensure that
/// the library containing these functions is properly loaded and the FFI definitions are correct.
pub fn add_default_gateway_ipv6(&self, address: Ipv6Addr) -> Option<MIB_IPFORWARD_ROW2> {
let mut forward_row = MIB_IPFORWARD_ROW2::default();
unsafe { InitializeIpForwardEntry(&mut forward_row) };
forward_row.InterfaceIndex = self.ipv6_if_index;
forward_row.InterfaceLuid = self.luid.into();
forward_row.DestinationPrefix.Prefix.si_family = AF_INET6;
forward_row.DestinationPrefix.Prefix.Ipv6.sin6_family = AF_INET6;
forward_row.NextHop.si_family = AF_INET6;
forward_row.NextHop.Ipv6.sin6_family = AF_INET6;
forward_row.NextHop.Ipv6.sin6_addr = IN6_ADDR {
u: IN6_ADDR_0 {
Byte: address.octets(),
},
};
forward_row.SitePrefixLength = 0;
forward_row.Metric = 1;
forward_row.Protocol = MIB_IPPROTO_NT_STATIC;
forward_row.Origin = NlroManual;
match unsafe { CreateIpForwardEntry2(&forward_row) }.ok() {
Ok(_) => Some(forward_row),
Err(err) => {
if err == ERROR_OBJECT_ALREADY_EXISTS.into() {
Some(forward_row)
} else {
None
}
}
}
}
/// Configures the network interface as a default IPv4 gateway with the specified metric.
///
/// # Arguments
///
/// * `metric`: Network metric (priority), defaults to 0
///
/// # Returns
///
/// * `Option<MIB_IPFORWARD_ROW2>`: Some(MIB_IPFORWARD_ROW2) on success, None on failure
///
/// # Safety
///
/// This function uses unsafe Windows API calls to initialize and create IP forward entries.
/// The caller should ensure that the provided metric is a valid network metric and
/// that the network interface is properly configured before calling this function.
pub fn assign_default_gateway_ipv4(&self, metric: u32) -> Option<MIB_IPFORWARD_ROW2> {
let mut forward_row = MIB_IPFORWARD_ROW2::default();
unsafe { InitializeIpForwardEntry(&mut forward_row) };
forward_row.InterfaceIndex = self.if_index;
forward_row.InterfaceLuid = self.luid.into();
forward_row.DestinationPrefix.Prefix.si_family = AF_INET;
forward_row.DestinationPrefix.Prefix.Ipv4.sin_family = AF_INET;
forward_row.NextHop.si_family = AF_INET;
forward_row.NextHop.Ipv4.sin_family = AF_INET;
forward_row.NextHop.Ipv4.sin_addr.S_un.S_addr = 0;
forward_row.SitePrefixLength = 0;
forward_row.Metric = metric;
forward_row.Protocol = MIB_IPPROTO_NT_STATIC;
forward_row.Origin = NlroManual;
match unsafe { CreateIpForwardEntry2(&forward_row) }.ok() {
Ok(_) => Some(forward_row),
Err(err) => {
if err == ERROR_OBJECT_ALREADY_EXISTS.into() {
Some(forward_row)
} else {
None
}
}
}
}
/// Configures the network interface as a default IPv6 gateway with the specified metric.
///
/// # Arguments
///
/// * `metric`: Network metric (priority), defaults to 0
///
/// # Returns
///
/// * `Option<MIB_IPFORWARD_ROW2>`: Some(MIB_IPFORWARD_ROW2) on success, None on failure
///
/// # Safety
///
/// This function uses unsafe Windows API calls to initialize and create IP forward entries.
/// The caller should ensure that the provided metric is a valid network metric and
/// that the network interface is properly configured before calling this function.
pub fn assign_default_gateway_ipv6(&self, metric: u32) -> Option<MIB_IPFORWARD_ROW2> {
let mut forward_row = MIB_IPFORWARD_ROW2::default();
unsafe { InitializeIpForwardEntry(&mut forward_row) };
forward_row.InterfaceIndex = self.ipv6_if_index;
forward_row.InterfaceLuid = self.luid.into();
forward_row.DestinationPrefix.Prefix.si_family = AF_INET6;
forward_row.DestinationPrefix.Prefix.Ipv6.sin6_family = AF_INET6;
forward_row.NextHop.si_family = AF_INET6;
forward_row.NextHop.Ipv6.sin6_family = AF_INET6;
forward_row.NextHop.Ipv6.sin6_addr = IN6_ADDR::default();
forward_row.SitePrefixLength = 0;
forward_row.Metric = metric;
forward_row.Protocol = MIB_IPPROTO_NT_STATIC;
forward_row.Origin = NlroManual;
match unsafe { CreateIpForwardEntry2(&forward_row) }.ok() {
Ok(_) => Some(forward_row),
Err(err) => {
if err == ERROR_OBJECT_ALREADY_EXISTS.into() {
Some(forward_row)
} else {
None
}
}
}
}
}