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change udp

master
godo 9 months ago
parent
commit
467e0f57b3
  1. 64
      godo/localchat/udp.go

64
godo/localchat/udp.go

@ -14,7 +14,7 @@ type UdpMessage struct {
Type string `json:"type"`
IP string `json:"ip"`
Hostname string `json:"hostname"`
Message any `json:"message"`
Message interface{} `json:"message"`
}
// 多播地址列表
@ -30,6 +30,7 @@ func init() {
func InitMulticast() {
myIP, myHostname, err := GetMyIPAndHostname()
if err != nil {
log.Println("Failed to get IP and hostname:", err)
return
}
message := UdpMessage{
@ -45,26 +46,37 @@ func SendMulticast(message UdpMessage) error {
for _, addrStr := range multicastAddrs {
addr, err := net.ResolveUDPAddr("udp4", addrStr)
if err != nil {
return err
log.Printf("Failed to resolve UDP address %s: %v", addrStr, err)
continue
}
conn, err := net.DialUDP("udp4", nil, addr)
// 使用本地地址进行连接
localAddr, err := net.ResolveUDPAddr("udp4", "0.0.0.0:0")
if err != nil {
return err
log.Printf("Failed to resolve local UDP address: %v", err)
continue
}
conn, err := net.ListenUDP("udp4", localAddr)
if err != nil {
log.Printf("Failed to listen on UDP address %s: %v", addrStr, err)
continue
}
defer conn.Close()
data, err := json.Marshal(message)
if err != nil {
return err
log.Printf("Failed to marshal JSON for %s: %v", addrStr, err)
continue
}
_, err = conn.WriteToUDP(data, addr)
if err != nil {
return err
log.Printf("Failed to write to UDP address %s: %v", addrStr, err)
continue
}
fmt.Printf("发送多播消息到 %s 成功\n", addrStr)
log.Printf("发送多播消息到 %s 成功", addrStr)
}
return nil
@ -78,20 +90,27 @@ func ListenForMulticast() {
for _, addrStr := range multicastAddrs {
multicastGroup, err = net.ResolveUDPAddr("udp4", addrStr)
if err != nil {
fmt.Println("Error resolving UDP address:", err)
log.Printf("Error resolving UDP address %s: %v", addrStr, err)
continue
}
break
}
if multicastGroup == nil {
fmt.Println("No available multicast address found")
log.Println("No available multicast address found")
return
}
// 使用本地地址进行监听
localAddr, err := net.ResolveUDPAddr("udp4", "0.0.0.0:2024")
if err != nil {
log.Printf("Error resolving local UDP address: %v", err)
return
}
conn, err := net.ListenUDP("udp4", &net.UDPAddr{IP: net.IPv4zero, Port: 2024})
conn, err := net.ListenUDP("udp4", localAddr)
if err != nil {
fmt.Println("Error listening on UDP address:", err)
log.Printf("Error listening on UDP address: %v", err)
return
}
defer conn.Close()
@ -109,6 +128,7 @@ func ListenForMulticast() {
for _, iface := range localIfaces {
addrs, err := iface.Addrs()
if err != nil {
log.Printf("Failed to get addresses for interface %s: %v", iface.Name, err)
continue
}
for _, addr := range addrs {
@ -129,7 +149,8 @@ func ListenForMulticast() {
}
if err := udpConn.JoinGroup(localInterface, multicastGroup); err != nil {
log.Fatalf("Failed to join multicast group: %v", err)
log.Printf("Failed to join multicast group %s: %v", multicastGroup.String(), err)
return
}
buffer := make([]byte, 1024)
@ -143,7 +164,7 @@ func ListenForMulticast() {
var udpMsg UdpMessage
err = json.Unmarshal(buffer[:n], &udpMsg)
if err != nil {
fmt.Printf("Error unmarshalling JSON: %v\n", err)
log.Printf("Error unmarshalling JSON: %v", err)
continue
}
@ -151,7 +172,7 @@ func ListenForMulticast() {
if udpMsg.Type == "file" {
RecieveFile(udpMsg)
}
fmt.Printf("Received message from %s: %s\n", udpMsg.IP, udpMsg.Hostname)
log.Printf("Received message from %s: %s", udpMsg.IP, udpMsg.Hostname)
}
}
@ -159,26 +180,37 @@ func ListenForMulticast() {
func SendToIP(ip string, message UdpMessage) error {
addr, err := net.ResolveUDPAddr("udp4", fmt.Sprintf("%s:2024", ip))
if err != nil {
log.Printf("Failed to resolve UDP address %s: %v", ip, err)
return err
}
// 使用本地地址进行连接
localAddr, err := net.ResolveUDPAddr("udp4", "0.0.0.0:0")
if err != nil {
log.Printf("Failed to resolve local UDP address: %v", err)
return err
}
conn, err := net.DialUDP("udp4", nil, addr)
conn, err := net.ListenUDP("udp4", localAddr)
if err != nil {
log.Printf("Failed to listen on UDP address %s: %v", ip, err)
return err
}
defer conn.Close()
data, err := json.Marshal(message)
if err != nil {
log.Printf("Failed to marshal JSON for %s: %v", ip, err)
return err
}
_, err = conn.WriteToUDP(data, addr)
if err != nil {
log.Printf("Failed to write to UDP address %s: %v", ip, err)
return err
}
fmt.Printf("发送 UDP 消息到 %s 成功\n", ip)
log.Printf("发送 UDP 消息到 %s 成功", ip)
return nil
}

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