pub fn get_host_by_addr(addr: IpAddr) -> Result<Option<HostEnt>, Error>
Expand description
Returns host information for a given IP address.
The IP address can either be an IPv4 or IPv6 address. The function waits
for all necessary IO to resolve. Upon success, it
returns a HostEnt
value if a host for the given name was found or
Ok(None)
otherwise.
ยงLimitations
For this initial version of the crate, the lookup is a files
lookup
first and only if that does fail to yield a result, a DNS query for
PTR records. This initial version also does not yet fill
the aliases list of the returned HostEnt
.
Examples found in repository?
examples/hostbyaddr.rs (line 27)
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
fn main() {
let mut args = env::args();
let cmd = args.next().unwrap();
let addr = match args.next() {
None => {
println!("Usage: {} <addr>", cmd);
return;
}
Some(addr) => addr
};
let addr = match IpAddr::from_str(&addr) {
Ok(addr) => addr,
Err(err) => {
println!("Not an address: {:?}", err);
return;
}
};
match get_host_by_addr(addr) {
Ok(Some(ent)) => {
println!("{}", addr);
println!(" {}", ent.name());
if !ent.aliases().is_empty() {
println!(" Aliases:");
for name in ent.aliases() {
println!(" {}", name);
}
}
println!(" Addresses:");
for addr in ent.addrs() {
println!(" {}", addr);
}
}
Ok(None) => println!("Not found."),
Err(err) => println!("Error: {:?}", err),
}
}