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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use deno_core::ErrBox;
use std::net::SocketAddr;
use std::net::ToSocketAddrs;
/// Resolve network address. Returns a future.
pub fn resolve_addr(hostname: &str, port: u16) -> Result<SocketAddr, ErrBox> {
// Default to localhost if given just the port. Example: ":80"
let addr: &str = if !hostname.is_empty() {
&hostname
} else {
"0.0.0.0"
};
// If this looks like an ipv6 IP address. Example: "[2001:db8::1]"
// Then we remove the brackets.
let addr = if addr.starts_with('[') && addr.ends_with(']') {
let l = addr.len() - 1;
addr.get(1..l).unwrap()
} else {
addr
};
let addr_port_pair = (addr, port);
let mut iter = addr_port_pair.to_socket_addrs()?;
Ok(iter.next().unwrap())
}
#[cfg(test)]
mod tests {
use super::*;
use std::net::Ipv4Addr;
use std::net::Ipv6Addr;
use std::net::SocketAddrV4;
use std::net::SocketAddrV6;
#[test]
fn resolve_addr1() {
let expected =
SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 80));
let actual = resolve_addr("127.0.0.1", 80).unwrap();
assert_eq!(actual, expected);
}
#[test]
fn resolve_addr2() {
let expected =
SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(0, 0, 0, 0), 80));
let actual = resolve_addr("", 80).unwrap();
assert_eq!(actual, expected);
}
#[test]
fn resolve_addr3() {
let expected =
SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(192, 0, 2, 1), 25));
let actual = resolve_addr("192.0.2.1", 25).unwrap();
assert_eq!(actual, expected);
}
#[test]
fn resolve_addr_ipv6() {
let expected = SocketAddr::V6(SocketAddrV6::new(
Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1),
8080,
0,
0,
));
let actual = resolve_addr("[2001:db8::1]", 8080).unwrap();
assert_eq!(actual, expected);
}
}
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