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fix: always append IPv6 bootstrap DNS servers #25

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Merged
Itsusinn merged 1 commit into from
Jun 15, 2026
Merged

fix: always append IPv6 bootstrap DNS servers #25

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85 changes: 30 additions & 55 deletions uniffi/clash-android-ffi/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -214,66 +214,41 @@ async fn run_clash(
};

config.general.ipv6 = over.ipv6;
let default_nameserver = if config.dns.default_nameserver.is_empty() {
// Bootstrap nameservers. These are built with no parent resolver, so the
// host must be a literal IP (a `Host::Domain` would hit the resolve path
// and fail). The IPv6 servers let resolution work on IPv6-only uplinks
// (e.g. 464XLAT cellular), where the interface has no IPv4 address and the
// IPv4 servers are unreachable.
// Bootstrap nameservers. These are built with no parent resolver, so the
// host must be a literal IP (a `Host::Domain` would hit the resolve path
// and fail).
let udp_bootstrap = |host: Host| NameServer {
net: DNSNetMode::Udp,
host,
port: 53,
interface: None,
proxy: None,
};
let mut default_nameserver = if config.dns.default_nameserver.is_empty() {
vec![
NameServer {
net: DNSNetMode::Udp,
host: Host::Ipv4(Ipv4Addr::new(223, 5, 5, 5)), // AliDNS
port: 53,
interface: None,
proxy: None,
},
NameServer {
net: DNSNetMode::Udp,
host: Host::Ipv4(Ipv4Addr::new(223, 6, 6, 6)), // AliDNS
port: 53,
interface: None,
proxy: None,
},
NameServer {
net: DNSNetMode::Udp,
host: Host::Ipv4(Ipv4Addr::new(8, 8, 8, 8)), // Google
port: 53,
interface: None,
proxy: None,
},
NameServer {
net: DNSNetMode::Udp,
// AliDNS public IPv6
host: Host::Ipv6(Ipv6Addr::new(0x2400, 0x3200, 0, 0, 0, 0, 0, 1)),
port: 53,
interface: None,
proxy: None,
},
NameServer {
net: DNSNetMode::Udp,
// AliDNS public IPv6
host: Host::Ipv6(Ipv6Addr::new(
0x2400, 0x3200, 0xbaba, 0, 0, 0, 0, 1,
)),
port: 53,
interface: None,
proxy: None,
},
NameServer {
net: DNSNetMode::Udp,
// Google public IPv6
host: Host::Ipv6(Ipv6Addr::new(
0x2001, 0x4860, 0x4860, 0, 0, 0, 0, 0x8888,
)),
port: 53,
interface: None,
proxy: None,
},
udp_bootstrap(Host::Ipv4(Ipv4Addr::new(223, 5, 5, 5))), // AliDNS
udp_bootstrap(Host::Ipv4(Ipv4Addr::new(223, 6, 6, 6))), // AliDNS
udp_bootstrap(Host::Ipv4(Ipv4Addr::new(8, 8, 8, 8))), // Google
]
} else {
config.dns.default_nameserver.clone()
};
// Always append IPv6 bootstrap servers so resolution works on IPv6-only
// uplinks (e.g. 464XLAT cellular), where the interface has no IPv4 address
// and the IPv4 servers are unreachable. We append unconditionally — even
// when the profile supplies its own `default-nameserver` — because such
// profiles are almost always IPv4-only and would otherwise have no usable
// bootstrap on an IPv6-only network.
let ipv6_bootstrap = [
Host::Ipv6(Ipv6Addr::new(0x2400, 0x3200, 0, 0, 0, 0, 0, 1)), // AliDNS
Host::Ipv6(Ipv6Addr::new(0x2400, 0x3200, 0xbaba, 0, 0, 0, 0, 1)), // AliDNS
Host::Ipv6(Ipv6Addr::new(0x2001, 0x4860, 0x4860, 0, 0, 0, 0, 0x8888)), // Google
];
for host in ipv6_bootstrap {
if !default_nameserver.iter().any(|ns| ns.host == host) {
default_nameserver.push(udp_bootstrap(host));
}
}
let nameserver = if config.dns.nameserver.is_empty() {
vec![
NameServer {
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