fix(shutdown): Fix shutdown command

magicpacket/magicpacket.go

@@ -60,25 +60,52 @@ func ExtractAuthFromPacket(data []byte) (string, string, []byte, bool) {
 		return "", "", nil, false
 	}
 
-	// Extract authentication part
-	authEnd := strings.Index(dataStr[len(AuthPrefix):], ":")
-	if authEnd == -1 {
+	// Find the first colon after "AUTH:" (end of username)
+	searchStart := len(AuthPrefix)
+	firstColon := strings.Index(dataStr[searchStart:], ":")
+	if firstColon == -1 {
 		return "", "", nil, false
 	}
-	authEnd += len(AuthPrefix)
+	firstColon += searchStart
+
+	// Find the second colon after the first one (end of password)
+	secondColon := strings.Index(dataStr[firstColon+1:], ":")
+	if secondColon == -1 {
+		// If no second colon, the password might be followed directly by binary data
+		// In this case, we need to find where the magic packet starts (6 bytes of 0xFF)
+		// Look for the magic packet header starting after the password
+		passwordEnd := len(dataStr)
+		for i := firstColon + 1; i < len(data) && i < firstColon+100; i++ {
+			// Check if we found the magic packet header (6 consecutive 0xFF bytes)
+			if i+5 < len(data) {
+				allFF := true
+				for j := 0; j < 6; j++ {
+					if data[i+j] != 0xFF {
+						allFF = false
+						break
+					}
+				}
+				if allFF {
+					passwordEnd = i
+					break
+				}
+			}
+		}
+
+		username := dataStr[searchStart:firstColon]
+		password := dataStr[firstColon+1 : passwordEnd]
+		magicPacketData := data[passwordEnd:]
+
+		return username, password, magicPacketData, true
+	}
+	secondColon += firstColon + 1
 
 	// Extract username and password
-	authPart := dataStr[len(AuthPrefix):authEnd]
-	parts := strings.Split(authPart, ":")
-	if len(parts) != 2 {
-		return "", "", nil, false
-	}
-
-	username := parts[0]
-	password := parts[1]
+	username := dataStr[searchStart:firstColon]
+	password := dataStr[firstColon+1 : secondColon]
 
 	// Extract magic packet part (after "AUTH:username:password:")
-	magicPacketStart := authEnd + 1
+	magicPacketStart := secondColon + 1
 	if magicPacketStart >= len(data) {
 		return "", "", nil, false
 	}