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use std::fmt;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
use std::ops::AddAssign;
use futures::future;
use futures::stream::{StreamExt, TryStreamExt};
use ipnet::{IpNet, Ipv4Net, Ipv6Net};
use netlink_packet_route::address::Nla::Address;
use netlink_packet_route::rtnl::constants::{AF_INET, AF_INET6};
use rtnetlink::new_connection;
use tokio::runtime::Runtime;
/// The errors that can occur when interacting with rtnetlink.
#[derive(Debug)]
pub enum Error {
RtNetlink(rtnetlink::Error),
IoError(std::io::Error),
LinkNotFound(Option<String>),
}
impl std::error::Error for Error {}
impl fmt::Display for Error {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::RtNetlink(e) => write!(fmt, "rtnetlink error: {}", e),
Self::IoError(e) => write!(fmt, "rtnetlink connection failed: {}", e),
Self::LinkNotFound(filter) => match filter {
Some(link) => write!(fmt, "link not found: {}", link),
None => write!(fmt, "no links found"),
},
}
}
}
impl From<rtnetlink::Error> for Error {
fn from(e: rtnetlink::Error) -> Self {
Self::RtNetlink(e)
}
}
impl From<std::io::Error> for Error {
fn from(e: std::io::Error) -> Self {
Self::IoError(e)
}
}
/// An alias for `std::result::Result` that uses `Error`
/// as its error type.
pub type Result<T> = std::result::Result<T, Error>;
/// Get all IP addresses of an interface.
pub fn addresses(link: String) -> Result<Vec<IpNet>> {
let rt = Runtime::new()?;
rt.block_on(internal_addresses(Some(link)))
}
/// Get the IPv4 addresses of an interface.
pub fn ipv4_addresses(link: String) -> Result<Vec<Ipv4Net>> {
let addrs = addresses(link)?
.iter()
.filter_map(|addr| match addr {
IpNet::V4(addr) => Some(*addr),
IpNet::V6(_) => None,
})
.collect();
Ok(addrs)
}
/// Get the IPv6 addresses of an interface.
pub fn ipv6_addresses(link: String) -> Result<Vec<Ipv6Net>> {
let addrs = addresses(link)?
.iter()
.filter_map(|addr| match addr {
IpNet::V4(_) => None,
IpNet::V6(addr) => Some(*addr),
})
.collect();
Ok(addrs)
}
/// Get all IP addresses of this host.
pub fn all_addresses() -> Result<Vec<IpNet>> {
let rt = Runtime::new()?;
rt.block_on(internal_addresses(None))
}
/// Get the IPv4 addresses of this host.
pub fn all_ipv4_addresses() -> Result<Vec<Ipv4Net>> {
let addrs = all_addresses()?
.iter()
.filter_map(|addr| match addr {
IpNet::V4(addr) => Some(*addr),
IpNet::V6(_) => None,
})
.collect();
Ok(addrs)
}
/// Get the IPv6 addresses of this host.
pub fn all_ipv6_addresses() -> Result<Vec<Ipv6Net>> {
let addrs = all_addresses()?
.iter()
.filter_map(|addr| match addr {
IpNet::V4(_) => None,
IpNet::V6(addr) => Some(*addr),
})
.collect();
Ok(addrs)
}
/// Get the IP addresses. If filter is Some, limit the search
/// to that interface.
async fn internal_addresses(filter: Option<String>) -> Result<Vec<IpNet>> {
let (connection, handle, _) = new_connection()?;
tokio::spawn(connection);
let mut links = handle.link().get();
if let Some(link) = filter.clone() {
links = links.match_name(link);
}
let mut links = links.execute();
let mut num_links = 0_i32;
let mut link_addrs = Vec::new();
while let Some(link) = links.try_next().await? {
let addrs = handle
.address()
.get()
.set_link_index_filter(link.header.index)
.execute();
let addrs = addrs
.map_ok(|v| {
if let Some(Address(bytes)) = v.nlas.first() {
match v.header.family as u16 {
AF_INET => {
let octets: [u8; 4] = (*bytes).clone().try_into().unwrap();
let ip = IpAddr::from(Ipv4Addr::from(octets));
let net = IpNet::new(ip, v.header.prefix_len).unwrap();
Some(net)
}
AF_INET6 => {
let octets: [u8; 16] = (*bytes).clone().try_into().unwrap();
let ip = IpAddr::from(Ipv6Addr::from(octets));
let net = IpNet::new(ip, v.header.prefix_len).unwrap();
Some(net)
}
_ => None,
}
} else {
None
}
})
.try_filter(|v| future::ready(v.is_some()))
.filter_map(|v| future::ready(v.unwrap()));
link_addrs.append(&mut addrs.collect::<Vec<IpNet>>().await);
num_links.add_assign(1);
}
if num_links > 0 {
Ok(link_addrs)
} else {
Err(Error::LinkNotFound(filter))
}
}
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