From 7dae4db52a403396bbe23ec6299f5a06d50e829b Mon Sep 17 00:00:00 2001
From: Dylan Conway <35280289+dylan-conway@users.noreply.github.com>
Date: Tue, 5 Sep 2023 06:12:54 -0700
Subject: fix ipv6 localhost fetch (#4498)

* `node` null for localhost getaddrinfo

* more test
---
 src/deps/uws.zig | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/deps/uws.zig b/src/deps/uws.zig
index 201544a75..d3228141b 100644
--- a/src/deps/uws.zig
+++ b/src/deps/uws.zig
@@ -369,8 +369,17 @@ pub fn NewSocketHandler(comptime is_ssl: bool) type {
             debug("connect({s}, {d})", .{ host, port });
             var stack_fallback = std.heap.stackFallback(1024, bun.default_allocator);
             var allocator = stack_fallback.get();
-            var host_ = allocator.dupeZ(u8, host) catch return null;
-            defer allocator.free(host_);
+
+            var host_: ?[*:0]u8 = brk: {
+                // getaddrinfo expects `node` to be null if localhost
+                if (host.len < 6 and (bun.strings.eqlComptime(host, "[::1]") or bun.strings.eqlComptime(host, "[::]"))) {
+                    break :brk null;
+                }
+
+                break :brk allocator.dupeZ(u8, host) catch return null;
+            };
+
+            defer if (host_) |host__| allocator.free(host__[0..host.len]);
 
             var socket = us_socket_context_connect(comptime ssl_int, socket_ctx, host_, port, null, 0, @sizeOf(*anyopaque)) orelse return null;
             const socket_ = ThisSocket{ .socket = socket };
-- 
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