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108 lines
2.5 KiB
108 lines
2.5 KiB
//go:build !windows
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// +build !windows
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package localchat
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import (
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"encoding/json"
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"log"
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"net"
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)
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func SendBroadcast(message UdpMessage) error {
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broadcastAddr := GetBroadcastAddr()
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addr, err := net.ResolveUDPAddr("udp4", broadcastAddr)
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if err != nil {
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log.Printf("Failed to resolve UDP address %s: %v", broadcastAddr, err)
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return err
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}
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// 使用本地地址进行连接
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localAddr, err := net.ResolveUDPAddr("udp4", "0.0.0.0:0")
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if err != nil {
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log.Printf("Failed to resolve local UDP address: %v", err)
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return err
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}
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conn, err := net.ListenUDP("udp4", localAddr)
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if err != nil {
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log.Printf("Failed to listen on UDP address %s: %v", broadcastAddr, err)
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return err
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}
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defer conn.Close()
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// 获取本地 IP 地址
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localIP, err := GetLocalIP()
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log.Printf("本地 IP 地址: %s", localIP)
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if err != nil {
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log.Printf("Failed to get local IP address: %v", err)
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return err
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}
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message.IP = localIP
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data, err := json.Marshal(message)
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if err != nil {
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log.Printf("Failed to marshal JSON for %s: %v", broadcastAddr, err)
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return err
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}
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_, err = conn.WriteToUDP(data, addr)
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if err != nil {
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log.Printf("Failed to write to UDP address %s: %v", broadcastAddr, err)
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return err
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}
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log.Printf("发送消息到 %s 成功", broadcastAddr)
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return nil
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}
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// ListenForBroadcast 监听多播消息
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func ListenForBroadcast() {
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broadcastAddr := GetBroadcastAddr()
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addr, err := net.ResolveUDPAddr("udp4", broadcastAddr)
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if err != nil {
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log.Fatalf("Failed to resolve UDP address: %v", err)
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}
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// 使用 ListenMulticastUDP 创建多播连接
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conn, err := net.ListenMulticastUDP("udp4", nil, addr)
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if err != nil {
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log.Fatalf("Failed to listen on UDP address: %v", err)
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}
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defer conn.Close()
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// 获取本地 IP 地址
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localIP, err := GetLocalIP()
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if err != nil {
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log.Printf("Failed to get local IP address: %v", err)
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}
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// 开始监听多播消息
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buffer := make([]byte, 1024)
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for {
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n, remoteAddr, err := conn.ReadFromUDP(buffer)
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if err != nil {
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log.Printf("Error reading from UDP: %v", err)
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continue
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}
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var udpMsg UdpMessage
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err = json.Unmarshal(buffer[:n], &udpMsg)
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if err != nil {
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log.Printf("Error unmarshalling JSON: %v", err)
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continue
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}
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if udpMsg.IP == localIP {
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continue
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}
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OnlineUsers[udpMsg.IP] = udpMsg
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if udpMsg.Type == "file" {
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RecieveFile(udpMsg)
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}
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log.Printf("Received message from %s: %s", remoteAddr, udpMsg.Hostname)
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}
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}
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func GetBroadcastAddr() string {
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//return libs.GetUdpAddr()
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return "224.0.0.251:20249"
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}
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