From cccb9f9ec42cf44aae66147bcf507b5912e71c7e Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 26 Apr 2026 23:32:50 +0000
Subject: [PATCH 1/2] fix: preserve ipv6 wildcard preconn binds

Agent-Logs-Url: https://github.com/Xeloan/flvx-tcppreconn/sessions/6bf9be86-c477-4973-a23c-7780c9a11974

Co-authored-by: Xeloan <105624127+Xeloan@users.noreply.github.com>
---
 go-gost/x/socket/preconn_manager.go      |  2 +-
 go-gost/x/socket/preconn_manager_test.go | 52 ++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 go-gost/x/socket/preconn_manager_test.go

diff --git a/go-gost/x/socket/preconn_manager.go b/go-gost/x/socket/preconn_manager.go
index 346812d..2528a66 100644
--- a/go-gost/x/socket/preconn_manager.go
+++ b/go-gost/x/socket/preconn_manager.go
@@ -164,7 +164,7 @@ func parseListenAddr(addr string) (string, string, error) {
 	if err != nil {
 		return "", "", err
 	}
-	if host == "" || host == "0.0.0.0" || host == "::" {
+	if host == "" || host == "0.0.0.0" {
 		host = "0.0.0.0"
 	}
 	return host, port, nil
diff --git a/go-gost/x/socket/preconn_manager_test.go b/go-gost/x/socket/preconn_manager_test.go
new file mode 100644
index 0000000..60c34d1
--- /dev/null
+++ b/go-gost/x/socket/preconn_manager_test.go
@@ -0,0 +1,52 @@
+package socket
+
+import "testing"
+
+func TestParseListenAddr(t *testing.T) {
+	tests := []struct {
+		name     string
+		addr     string
+		wantHost string
+		wantPort string
+	}{
+		{
+			name:     "defaults empty host to ipv4 wildcard",
+			addr:     ":32000",
+			wantHost: "0.0.0.0",
+			wantPort: "32000",
+		},
+		{
+			name:     "keeps ipv4 wildcard",
+			addr:     "0.0.0.0:32001",
+			wantHost: "0.0.0.0",
+			wantPort: "32001",
+		},
+		{
+			name:     "keeps ipv6 wildcard",
+			addr:     "[::]:32002",
+			wantHost: "::",
+			wantPort: "32002",
+		},
+		{
+			name:     "keeps specific ipv6 address",
+			addr:     "[2001:db8::1]:32003",
+			wantHost: "2001:db8::1",
+			wantPort: "32003",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			gotHost, gotPort, err := parseListenAddr(tt.addr)
+			if err != nil {
+				t.Fatalf("parseListenAddr returned error: %v", err)
+			}
+			if gotHost != tt.wantHost {
+				t.Fatalf("expected host %q, got %q", tt.wantHost, gotHost)
+			}
+			if gotPort != tt.wantPort {
+				t.Fatalf("expected port %q, got %q", tt.wantPort, gotPort)
+			}
+		})
+	}
+}

From 5eb988d2b76bbca56e8f35ee699cabfda6e7c80f Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 26 Apr 2026 23:35:07 +0000
Subject: [PATCH 2/2] docs: clarify preconn wildcard bind behavior

Agent-Logs-Url: https://github.com/Xeloan/flvx-tcppreconn/sessions/6bf9be86-c477-4973-a23c-7780c9a11974

Co-authored-by: Xeloan <105624127+Xeloan@users.noreply.github.com>
---
 go-gost/x/socket/preconn_manager.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/go-gost/x/socket/preconn_manager.go b/go-gost/x/socket/preconn_manager.go
index 2528a66..441f18b 100644
--- a/go-gost/x/socket/preconn_manager.go
+++ b/go-gost/x/socket/preconn_manager.go
@@ -165,6 +165,8 @@ func parseListenAddr(addr string) (string, string, error) {
 		return "", "", err
 	}
 	if host == "" || host == "0.0.0.0" {
+		// Keep the legacy empty-host behavior mapped to IPv4 wildcard, but
+		// preserve an explicit "::" so dual-stack listeners stay IPv6-capable.
 		host = "0.0.0.0"
 	}
 	return host, port, nil