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Old 24th November 2009, 08:07 AM
A_n_H Offline
Registered User
Join Date: Mar 2009
Posts: 64
UDP server not sending to client

Hi there,

I have a problem with my connected UDP server, I want to to send info to the client using send(), but for some reason I always get an error message such as: "bad file descriptor", any idea why?

here is a sample of my code:

int main(int argc, char *argv[]) 
	unsigned int localPort;
	int serverSock;
	int clientSock;
	int messageLength;
	unsigned int clientLen;
	unsigned char buffer[BUFFER_SIZE];
	unsigned char message[MESSAGE_SIZE];
	struct sockaddr_in serverAddr;
	struct sockaddr_in clientAddr;
	char* ptr;	
	FILE* file;

	localPort = strtol(argv[1], &ptr, 10);

	if ((serverSock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) 
		printf("Failed to create socket\n");	

	memset(&serverAddr, 0, sizeof(serverAddr));   
	serverAddr.sin_family = AF_INET;             
	serverAddr.sin_addr.s_addr = htonl(INADDR_ANY); 
	serverAddr.sin_port = htons(localPort);      
	clientAddr.sin_addr.s_addr = htonl(INADDR_ANY);

	if (bind(serverSock, (struct sockaddr *) &serverAddr, sizeof(serverAddr)) < 0) 
	        printf("Failed to bind the server socket\n");

	while (1) 
               //let the server connect to the client address so that only one client
              // maybe processed at a time
		clientLen = sizeof(clientAddr);
		if (connect(serverSock, (struct sockaddr *) &clientAddr, clientLen) < 0) 
			perror("Failed to connect with server");
               //recv works gr8
		if ((bytes = recv(serverSock, buffer, BUFFER_SIZE-1, 0)) < 1 ) 
			fprintf(stderr,"Failed to receive bytes from server\n");

		file = fopen(buffer, "r");

		if( file == NULL ) 
			messageLength = strlen(message);
                       //here is the problem I always get destination address required
			if ( send(serverSock,message,messageLength,0) != messageLength) 

                 more code here

		clientAddr.sin_addr.s_addr = htonl(AF_UNSPEC);



Edit: Edit: anyone has any ideas please, ive been stuck on this problem for 2 days now

Last edited by A_n_H; 24th November 2009 at 09:35 PM.
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client, sending, server, udp

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