rust_p2p_core/extend/
addr.rs

1use std::io;
2use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
3use tokio::net::UdpSocket;
4
5pub async fn local_ipv4() -> io::Result<Ipv4Addr> {
6    let socket = UdpSocket::bind("0.0.0.0:0").await?;
7    socket.connect("8.8.8.8:80").await?;
8    let addr = socket.local_addr()?;
9    match addr.ip() {
10        IpAddr::V4(ip) => Ok(ip),
11        IpAddr::V6(_) => Ok(Ipv4Addr::UNSPECIFIED),
12    }
13}
14pub async fn local_ipv6() -> io::Result<Ipv6Addr> {
15    let socket = UdpSocket::bind("[::]:0").await?;
16    socket
17        .connect("[2001:4860:4860:0000:0000:0000:0000:8888]:80")
18        .await?;
19    let addr = socket.local_addr()?;
20    match addr.ip() {
21        IpAddr::V4(_) => Ok(Ipv6Addr::UNSPECIFIED),
22        IpAddr::V6(ip) => Ok(ip),
23    }
24}
25
26pub const fn is_ipv4_global(ipv4: &Ipv4Addr) -> bool {
27    !(ipv4.octets()[0] == 0 // "This network"
28        || ipv4.is_private()
29        || ipv4.octets()[0] == 100 && (ipv4.octets()[1] & 0b1100_0000 == 0b0100_0000)//ipv4.is_shared()
30        || ipv4.is_loopback()
31        || ipv4.is_link_local()
32        // addresses reserved for future protocols (`192.0.0.0/24`)
33        // .9 and .10 are documented as globally reachable so they're excluded
34        || (
35        ipv4.octets()[0] == 192 && ipv4.octets()[1] == 0 && ipv4.octets()[2] == 0
36            && ipv4.octets()[3] != 9 && ipv4.octets()[3] != 10
37    )
38        || ipv4.is_documentation()
39        || ipv4.octets()[0] == 198 && (ipv4.octets()[1] & 0xfe) == 18//ipv4.is_benchmarking()
40        || ipv4.octets()[0] & 240 == 240 && !ipv4.is_broadcast()//ipv4.is_reserved()
41        || ipv4.is_broadcast())
42}
43
44pub const fn is_ipv6_global(ipv6addr: &Ipv6Addr) -> bool {
45    !(ipv6addr.is_unspecified()
46        || ipv6addr.is_loopback()
47        // IPv4-mapped Address (`::ffff:0:0/96`)
48        || matches!(ipv6addr.segments(), [0, 0, 0, 0, 0, 0xffff, _, _])
49        // IPv4-IPv6 Translat. (`64:ff9b:1::/48`)
50        || matches!(ipv6addr.segments(), [0x64, 0xff9b, 1, _, _, _, _, _])
51        // Discard-Only Address Block (`100::/64`)
52        || matches!(ipv6addr.segments(), [0x100, 0, 0, 0, _, _, _, _])
53        // IETF Protocol Assignments (`2001::/23`)
54        || (matches!(ipv6addr.segments(), [0x2001, b, _, _, _, _, _, _] if b < 0x200)
55        && !(
56        // Port Control Protocol Anycast (`2001:1::1`)
57        u128::from_be_bytes(ipv6addr.octets()) == 0x2001_0001_0000_0000_0000_0000_0000_0001
58            // Traversal Using Relays around NAT Anycast (`2001:1::2`)
59            || u128::from_be_bytes(ipv6addr.octets()) == 0x2001_0001_0000_0000_0000_0000_0000_0002
60            // AMT (`2001:3::/32`)
61            || matches!(ipv6addr.segments(), [0x2001, 3, _, _, _, _, _, _])
62            // AS112-v6 (`2001:4:112::/48`)
63            || matches!(ipv6addr.segments(), [0x2001, 4, 0x112, _, _, _, _, _])
64            // ORCHIDv2 (`2001:20::/28`)
65            || matches!(ipv6addr.segments(), [0x2001, b, _, _, _, _, _, _] if b >= 0x20 && b <= 0x2F)
66    ))
67        || (ipv6addr.segments()[0] == 0x2001) && (ipv6addr.segments()[1] == 0xdb8)//ipv6addr.is_documentation()
68        || (ipv6addr.segments()[0] & 0xfe00) == 0xfc00//ipv6addr.is_unique_local()
69        || (ipv6addr.segments()[0] & 0xffc0) == 0xfe80) //ipv6addr.is_unicast_link_local())
70}
rust_p2p_core/extend/addr.rs

rust_p2p_core/extend/
addr.rs
