C中的UDP套接字 [英] UDP Sockets in C
本文介绍了C中的UDP套接字的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在处理课堂作业问题.我想启动一个侦听文件请求的 UDP 服务器.它打开文件并使用 UDP 将其发送回请求客户端.
I'm working on a homework problem for class. I want to start a UDP Server that listens for a file request. It opens the file and sends it back to the requesting client with UDP.
这是服务器代码.
// Create UDP Socket
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
perror("Can't create socket");
exit(-1);
}
// Configure socket
memset(&server, 0, sizeof server);
server.sin_family = AF_INET; // Use IPv4
server.sin_addr.s_addr = htonl(INADDR_ANY); // My IP
server.sin_port = htons(atoi(argv[1])); // Server Port
// Bind socket
if ((bind(sockfd, (struct sockaddr *) &server, sizeof(server))) == -1) {
close(sockfd);
perror("Can't bind");
}
printf("listener: waiting to recvfrom...
");
if (listen(sockfd, 5) == -1) {
perror("Can't listen for connections");
exit(-1);
}
while (1) {
client_len = sizeof(struct sockaddr_in);
newsockfd = accept(sockfd, (struct sockaddr*)&client,&client_len);
if (newsockfd < 0) {
perror("ERROR on accept");
}
// Some how parse request
// I do I use recv or recvfrom?
// I do I make new UDP socket to send data back to client?
sendFile(newsockfd, filename);
close(newsockfd);
}
close(sockfd);
我有点迷路了如何从客户端接收数据?以及如何与客户端建立新的 UDP 连接?
I'm kind of lost how do I recv data from the client? And how to I make a new UDP connection back to the client?
推荐答案
我用C写了一个UDP server-client,客户端发送一个注册号,服务器给出一个名字作为反馈.
I have written a UDP server-client in C , where the client sends a registration number and the server gives a name as the feedback.
服务器
0. Variable initialization
1. sock()
2. bind()
3. recvfrom()
4. sendto()
客户
0. gethostbyname()
1. sock()
2. bzero()
4. sendto()
5. recvfrom()
希望对您有所帮助.您可以在此处找到示例代码 udp server/client
Hope it helps. You can find the example code here udp server/client
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