[英]c++ WINSOCK recvfrom no get data from network
我有问题,因为我的服务器无法获取UDP数据。 路由器上的端口被转发,数据收入到本地服务器网络(在嗅探器(3)上可见),但服务器未收到。
您会看到1和2个TCP数据包将收入正确地发送给已连接套接字上的服务器。 但是我的客户端然后将UDP数据发送到服务器,并且数据输入到本地服务器网络(请参阅嗅探器在3上检测到它),但是服务器不接收它。
这是客户代码:
struct sockaddr_in si_other;
int s, slen = sizeof(si_other);
char buf[10];
char message[10];
WSADATA wsa;
//Initialise winsock
printf("\nInitialising Winsock...");
if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
{
printf("Failed. Error Code : %d", WSAGetLastError());
exit(EXIT_FAILURE);
}
printf("Initialised.\n");
//create socket
if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == SOCKET_ERROR)
{
printf("socket() failed with error code : %d", WSAGetLastError());
exit(EXIT_FAILURE);
}
//setup address structure
memset((char *)&si_other, 0, sizeof(si_other));
si_other.sin_family = AF_INET;
si_other.sin_port = htons(14996);
si_other.sin_addr.S_un.S_addr = inet_addr(server ip);
memcpy(message, "cokolwiek", 8);
//send the message
if (sendto(s, message, strlen(message), 0, (struct sockaddr *) &si_other, slen) == SOCKET_ERROR)
{
printf("sendto() failed with error code : %d", WSAGetLastError());
exit(EXIT_FAILURE);
}
但这不是客户端的问题。 这是服务器代码,但我认为它也是正确的:
SOCKET s;
struct sockaddr_in server, si_other;
int slen, recv_len;
char buf[10];
WSADATA wsa;
slen = sizeof(si_other);
//Initialise winsock
printf("\nInitialising Winsock...");
if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
{
printf("Failed. Error Code : %d", WSAGetLastError());
exit(EXIT_FAILURE);
}
printf("Initialised.\n");
//Create a socket
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == INVALID_SOCKET)
{
printf("Could not create socket : %d", WSAGetLastError());
}
printf("Socket created.\n");
//Prepare the sockaddr_in structure
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = htons(14996);
//Bind
if (::bind(s, (struct sockaddr *)&server, sizeof(server)) == SOCKET_ERROR)
{
printf("Bind failed with error code : %d", WSAGetLastError());
exit(EXIT_FAILURE);
}
puts("Bind done");
//blocking on it, waiting for data
if ((recv_len = recvfrom(s, buf, 10, 0, (struct sockaddr *) &si_other, &slen)) == SOCKET_ERROR)
{
printf("recvfrom() failed with error code : %d", WSAGetLastError());
exit(EXIT_FAILURE);
}
//print details of the client/peer and the data received
printf("Received packet from %s:%d\n", inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port));
printf("Data: %s\n", buf);
一些说明可能会有所帮助-主服务器循环为select(),当客户端请求订单时,服务器将订单发送回客户端并开始执行命令。
server:
while (1) {
select()
if (socket is in FD_SET)
get data, send it back and handleCommand()
}
handleCommand() {
tcp data exchange
wait for udp packet - it fail
}
client:
sendCommand()
//another receiving commands thread
while (recv) {
handle command
tcp data exchange
send udp data
}
请不要再让我再等一次。 我需要为NAT穿越打孔。 那是什么问题 另一个听众正在获取我的数据? 但是netstat -nop UDP -a没有提供其他正在监听的信息,并且绑定套接字也没有失败。 另一个重要的信息该代码在程序开始时起作用,我的意思是服务器接收数据,但后来没有。
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