From f3a2c877b7215362497d9c108dd6425f4bfe5a68 Mon Sep 17 00:00:00 2001 From: godo Date: Thu, 5 Sep 2024 16:23:56 +0800 Subject: [PATCH] change udp --- godo/localchat/udp.go | 57 +++++++++++++++++++++++++++++++++++++++---- 1 file changed, 52 insertions(+), 5 deletions(-) diff --git a/godo/localchat/udp.go b/godo/localchat/udp.go index 73998c2..094f519 100644 --- a/godo/localchat/udp.go +++ b/godo/localchat/udp.go @@ -24,6 +24,7 @@ var OnlineUsers = make(map[string]UdpMessage) func init() { go InitBroadcast() go ListenForBroadcast() + go ListenLocalBroadcast() } func InitBroadcast() { @@ -41,15 +42,23 @@ func InitBroadcast() { Hostname: hostname, Message: "", } - err = SendBroadcast(message) + //发送多播消息 + broadcastAddr := GetBroadcastAddr() + err = SendBroadcast(broadcastAddr, message) if err != nil { log.Println("Failed to send broadcast message:", err) } + //发送广播播消息 + moreAddr := "255.255.255.255:20249" + err = SendBroadcast(moreAddr, message) + if err != nil { + log.Println("Failed to send more broadcast message:", err) + } } } -func SendBroadcast(message UdpMessage) error { - broadcastAddr := GetBroadcastAddr() +func SendBroadcast(broadcastAddr string, message UdpMessage) error { + addr, err := net.ResolveUDPAddr("udp4", broadcastAddr) if err != nil { log.Printf("Failed to resolve UDP address %s: %v", broadcastAddr, err) @@ -91,11 +100,11 @@ func SendBroadcast(message UdpMessage) error { return err } - log.Printf("发送广播消息到 %s 成功", broadcastAddr) + log.Printf("发送消息到 %s 成功", broadcastAddr) return nil } -// ListenForBroadcast 监听广播消息 +// ListenForBroadcast 监听多播消息 func ListenForBroadcast() { broadcastAddr := GetBroadcastAddr() addr, err := net.ResolveUDPAddr("udp4", broadcastAddr) @@ -141,6 +150,44 @@ func ListenForBroadcast() { } } +// ListenLocalBroadcast 监听广播消息 +func ListenLocalBroadcast() { + // 使用本地地址监听 + localAddr, err := net.ResolveUDPAddr("udp4", ":56780") + if err != nil { + log.Fatalf("Failed to resolve local UDP address: %v", err) + } + + conn, err := net.ListenUDP("udp4", localAddr) + if err != nil { + log.Fatalf("Failed to listen on UDP address: %v", err) + } + defer conn.Close() + + // 开始监听广播消息 + buffer := make([]byte, 1024) + for { + n, remoteAddr, err := conn.ReadFromUDP(buffer) + if err != nil { + log.Printf("Error reading from UDP: %v", err) + continue + } + + var udpMsg UdpMessage + err = json.Unmarshal(buffer[:n], &udpMsg) + if err != nil { + log.Printf("Error unmarshalling JSON: %v", err) + continue + } + + OnlineUsers[udpMsg.IP] = udpMsg + if udpMsg.Type == "file" { + RecieveFile(udpMsg) + } + log.Printf("Received message from %s: %s", remoteAddr, udpMsg.Hostname) + } +} + // SendToIP 向指定的 IP 地址发送 UDP 消息 func SendToIP(message UdpMessage) error { toIp := message.IP