Merge pull request #1322 from shirou/feature/net_fix_big_endian

fix(net,linux): fix decodeaddress if Big Endian

internal/common/endian.go

@@ -0,0 +1,10 @@
+package common
+
+import "unsafe"
+
+// IsLittleEndian checks if the current platform uses little-endian.
+// copied from https://github.com/ntrrg/ntgo/blob/v0.8.0/runtime/infrastructure.go#L16 (MIT License)
+func IsLittleEndian() bool {
+	var x int16 = 0x0011
+	return *(*byte)(unsafe.Pointer(&x)) == 0x11
+}

net/net_linux.go

@@ -721,9 +721,13 @@ func decodeAddressWithContext(ctx context.Context, family uint32, src string) (A
 		return Addr{}, fmt.Errorf("decode error, %w", err)
 	}
 	var ip net.IP
-	// Assumes this is little_endian
+
 	if family == syscall.AF_INET {
-		ip = net.IP(ReverseWithContext(ctx, decoded))
+		if common.IsLittleEndian() {
+			ip = net.IP(ReverseWithContext(ctx, decoded))
+		} else {
+			ip = net.IP(decoded)
+		}
 	} else { // IPv6
 		ip, err = parseIPv6HexStringWithContext(ctx, decoded)
 		if err != nil {

net/net_linux_test.go

@@ -137,14 +137,6 @@ func TestDecodeAddress(t *testing.T) {
 	assert := assert.New(t)
 
 	addr := map[string]AddrTest{
-		"0500000A:0016": {
-			IP:   "10.0.0.5",
-			Port: 22,
-		},
-		"0100007F:D1C2": {
-			IP:   "127.0.0.1",
-			Port: 53698,
-		},
 		"11111:0035": {
 			Error: true,
 		},
@@ -159,6 +151,25 @@ func TestDecodeAddress(t *testing.T) {
 			Error: true,
 		},
 	}
+	if common.IsLittleEndian() {
+		addr["0500000A:0016"] = AddrTest{
+			IP:   "10.0.0.5",
+			Port: 22,
+		}
+		addr["0100007F:D1C2"] = AddrTest{
+			IP:   "127.0.0.1",
+			Port: 53698,
+		}
+	} else {
+		addr["0A000005:0016"] = AddrTest{
+			IP:   "10.0.0.5",
+			Port: 22,
+		}
+		addr["7F000001:D1C2"] = AddrTest{
+			IP:   "127.0.0.1",
+			Port: 53698,
+		}
+	}
 
 	for src, dst := range addr {
 		family := syscall.AF_INET