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@ -14,7 +14,7 @@ type UdpMessage struct { |
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Type string `json:"type"` |
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IP string `json:"ip"` |
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Hostname string `json:"hostname"` |
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Message any `json:"message"` |
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Message interface{} `json:"message"` |
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} |
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// 多播地址列表
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@ -30,6 +30,7 @@ func init() { |
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func InitMulticast() { |
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myIP, myHostname, err := GetMyIPAndHostname() |
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if err != nil { |
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log.Println("Failed to get IP and hostname:", err) |
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return |
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} |
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message := UdpMessage{ |
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@ -45,26 +46,37 @@ func SendMulticast(message UdpMessage) error { |
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for _, addrStr := range multicastAddrs { |
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addr, err := net.ResolveUDPAddr("udp4", addrStr) |
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if err != nil { |
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return err |
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log.Printf("Failed to resolve UDP address %s: %v", addrStr, err) |
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continue |
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} |
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conn, err := net.DialUDP("udp4", nil, addr) |
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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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return err |
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log.Printf("Failed to resolve local UDP address: %v", err) |
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continue |
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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", addrStr, err) |
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continue |
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} |
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defer conn.Close() |
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data, err := json.Marshal(message) |
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if err != nil { |
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return err |
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log.Printf("Failed to marshal JSON for %s: %v", addrStr, err) |
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continue |
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} |
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_, err = conn.WriteToUDP(data, addr) |
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if err != nil { |
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return err |
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log.Printf("Failed to write to UDP address %s: %v", addrStr, err) |
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continue |
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} |
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fmt.Printf("发送多播消息到 %s 成功\n", addrStr) |
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log.Printf("发送多播消息到 %s 成功", addrStr) |
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} |
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return nil |
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@ -78,20 +90,27 @@ func ListenForMulticast() { |
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for _, addrStr := range multicastAddrs { |
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multicastGroup, err = net.ResolveUDPAddr("udp4", addrStr) |
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if err != nil { |
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fmt.Println("Error resolving UDP address:", err) |
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log.Printf("Error resolving UDP address %s: %v", addrStr, err) |
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continue |
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} |
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break |
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} |
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if multicastGroup == nil { |
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fmt.Println("No available multicast address found") |
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log.Println("No available multicast address found") |
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return |
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} |
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// 使用本地地址进行监听
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localAddr, err := net.ResolveUDPAddr("udp4", "0.0.0.0:2024") |
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if err != nil { |
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log.Printf("Error resolving local UDP address: %v", err) |
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return |
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} |
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conn, err := net.ListenUDP("udp4", &net.UDPAddr{IP: net.IPv4zero, Port: 2024}) |
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conn, err := net.ListenUDP("udp4", localAddr) |
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if err != nil { |
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fmt.Println("Error listening on UDP address:", err) |
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log.Printf("Error listening on UDP address: %v", err) |
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return |
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} |
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defer conn.Close() |
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@ -109,6 +128,7 @@ func ListenForMulticast() { |
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for _, iface := range localIfaces { |
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addrs, err := iface.Addrs() |
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if err != nil { |
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log.Printf("Failed to get addresses for interface %s: %v", iface.Name, err) |
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continue |
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} |
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for _, addr := range addrs { |
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@ -129,7 +149,8 @@ func ListenForMulticast() { |
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} |
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if err := udpConn.JoinGroup(localInterface, multicastGroup); err != nil { |
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log.Fatalf("Failed to join multicast group: %v", err) |
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log.Printf("Failed to join multicast group %s: %v", multicastGroup.String(), err) |
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return |
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} |
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buffer := make([]byte, 1024) |
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@ -143,7 +164,7 @@ func ListenForMulticast() { |
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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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fmt.Printf("Error unmarshalling JSON: %v\n", err) |
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log.Printf("Error unmarshalling JSON: %v", err) |
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continue |
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} |
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@ -151,7 +172,7 @@ func ListenForMulticast() { |
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if udpMsg.Type == "file" { |
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RecieveFile(udpMsg) |
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} |
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fmt.Printf("Received message from %s: %s\n", udpMsg.IP, udpMsg.Hostname) |
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log.Printf("Received message from %s: %s", udpMsg.IP, udpMsg.Hostname) |
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} |
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} |
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@ -159,26 +180,37 @@ func ListenForMulticast() { |
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func SendToIP(ip string, message UdpMessage) error { |
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addr, err := net.ResolveUDPAddr("udp4", fmt.Sprintf("%s:2024", ip)) |
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if err != nil { |
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log.Printf("Failed to resolve UDP address %s: %v", ip, 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.DialUDP("udp4", nil, addr) |
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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", ip, err) |
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return err |
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} |
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defer conn.Close() |
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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", ip, 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", ip, err) |
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return err |
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} |
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fmt.Printf("发送 UDP 消息到 %s 成功\n", ip) |
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log.Printf("发送 UDP 消息到 %s 成功", ip) |
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return nil |
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} |
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