i have problem because my server dont get UDP data. Ports on router are forwarded, data income to local-server network (it is visible on sniffer (3) ) but server dont receive it.
Server and server network screen
You can see 1 and 2 TCP packets correct income to server on connected sockets. But my client then send UDP data to server and data enter to local-server network (see that sniffer detect it on 3) but server dont take it.
Here is code of client:
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);
}
But its not problem with client. Here is server code but i think it is also correct:
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);
Some description that may help - main server loop is select() and when client ask for order, server send order back to client and starts proceeding command.
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
}
Pls dont give me answears to do it in another wait. I need to punch hole for NAT Traversal. What problem is that? Another listener grabbing my data? But netstat -nop UDP -a didn't give information that something other is listening, and bind socket didn't failed. Also another important information That code work on the begining of program, i mean server receive data but later not.
message
might not be well initialized:memcpy(message, "cokolwiek", 8);
, check value returned bystrlen()
– Mathieu