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std.net: check for localhost names before asking DNS

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the old implementation asks DNS before checking if it shouldn't.
additionally, it did not catch absolute 'localhost.' names.
This commit is contained in:
praschke 2023-01-10 15:26:01 +00:00 committed by Andrew Kelley
parent 9b807f9c17
commit 3ab43988c1
1 changed files with 6 additions and 6 deletions
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12
lib/std/net.zig
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@ -882,21 +882,21 @@ fn linuxLookupName(
} else {
try linuxLookupNameFromHosts(addrs, canon, name, family, port);
if (addrs.items.len == 0) {
try linuxLookupNameFromDnsSearch(addrs, canon, name, family, port);
}
if (addrs.items.len == 0) {
// RFC 6761 Section 6.3
// RFC 6761 Section 6.3.3
// Name resolution APIs and libraries SHOULD recognize localhost
// names as special and SHOULD always return the IP loopback address
// for address queries and negative responses for all other query
// types.
// Check for equal to "localhost" or ends in ".localhost"
if (mem.endsWith(u8, name, "localhost") and (name.len == "localhost".len or name[name.len - "localhost".len] == '.')) {
// Check for equal to "localhost(.)" or ends in ".localhost(.)"
const localhost = if (name[name.len - 1] == '.') "localhost." else "localhost";
if (mem.endsWith(u8, name, localhost) and (name.len == localhost.len or name[name.len - localhost.len] == '.')) {
try addrs.append(LookupAddr{ .addr = .{ .in = Ip4Address.parse("127.0.0.1", port) catch unreachable } });
try addrs.append(LookupAddr{ .addr = .{ .in6 = Ip6Address.parse("::1", port) catch unreachable } });
return;
}
try linuxLookupNameFromDnsSearch(addrs, canon, name, family, port);
}
}
} else {