sysdis-tp/server.c

#include "server.h"



int main(int argc, char* argv[]){

	/* [1] Initialisation
	=========================================================*/
	/* (1) Client address + port */
	struct sockaddr_in addr_client;
	int port;

	/* (2) Sockets */
	int listensock, datasock;

	/* (3) Struct to send arguments to threadable process */
	pthread_arg_wrapper built_args = {0, 0};




	/* [2] Manage arguments
	=========================================================*/
	/* (1) Manage arguments count */
	if( argc < 2 ){
		printf("Missing arguments\nUsage: server port [message]\n");
		printf("port = 0 : automatic port\n");
		return 1;
	}

	/* (2) Manage port argument */
	if( sscanf(argv[1], "%d", &port) <= 0 ){
		printf("argument error: port must be a valid integer\n");
		printf("port = 0 : automatic port\n");
		return 1;
	}



	/* [3] Create socket
	=========================================================*/
	/* (1) Create socket */
	listensock = xbind(port);

	/* (1-) Manage error */
	if( listensock == -1 ){
		perror("erreur création socket");
		exit(1);
	}


	/* [4] Wait for clients indefinately
	=========================================================*/
	int i, index = -1; // thread index
	while( 1 ){

		/* (1) Listen for incoming connection */
		index = -1;
		DEBUG&& debug("server", "wait for client");
		datasock = xlisten(listensock, &addr_client);

		/* (2) Manage error */
		if( datasock == -1 ){
			DEBUG&& printf("error\n");
			continue;
		}

		DEBUG&& printf("done\n");


		/* (3) Search for a free manager */
		DEBUG&& debug("server", "finding free thread");
		for( i = 0 ; i < maxClients ; i++ )

			if( a_managers[i] == 0 ){
				index = i;
				break;
			}


		/* (4) If we haven't found a free manager -> do nothing (john snow) */
		if( index == -1 ){
			DEBUG&& printf("not found\n");
			continue;
		}

		DEBUG&& printf("found\n");

		/* (5) Build thread arguments */
		built_args.socket = datasock;
		built_args.index  = index;

		/* (6) Processing client connection on a new thread */
		pthread_create(&managers[index], NULL, manageClient, (void*)(intptr_t) &built_args);

		/* (7) Mark the manager as active */
		a_managers[index] = 1;
		

	}

	/* [5] Wait for all threads to end
	=========================================================*/
	/* (1) Wait for all threads to end properly */
	for( i = 0 ; i < maxClients ; i++ )
		pthread_join(managers[i], NULL);

	/* (2) Close listening socket */
	close(listensock);

	return 0;
}










void* manageClient(void* pthread_args){


	/* [1] Initialization
	=========================================================*/
	/* (1) Initialize socket data */
	struct sockaddr_in addr_client;
	char* to_send = (char*) malloc( BUFSIZE * sizeof(char) );
	char* to_recv = (char*) malloc( BUFSIZE * sizeof(char) );
	int bytes; // transfer count
	char client_ip[20];

	/* (2) Fetch arguments */
	pthread_arg_wrapper* arguments = (pthread_arg_wrapper*) (intptr_t) pthread_args;

	// get client_socket
	int datasock     = arguments->socket;
	int thread_index = arguments->index;

	strcpy(to_send, "server default response"); 


	DEBUG&& debug("thread", "starting thread");
	DEBUG&& printf("success[%d]\n", thread_index);

	/* [2] Wait for data
	=========================================================*/
	/* (1) wait/read data */
	bytes = xread(datasock, to_recv, BUFSIZE);

	/* (2) Manage error */
	if( bytes == -1 ){
		perror("erreur reception paquet");
		exit(1);
	}


	// Get client ip
	inet_ntop(AF_INET, &(addr_client.sin_addr), client_ip, 20);

	printf("*** received '%s' (%d bytes) from %s:%d\n", to_recv, bytes, client_ip, ntohs(addr_client.sin_port));



	/* [3] Send response
	=========================================================*/
	/* (1) Send response */
	bytes = xwrite(datasock, to_send);

	/* (2) Manage error */
	if( bytes == -1 ){
		perror("erreur envoi réponse");
		exit(1);
	}



	/* [4] End process
	=========================================================*/
	/* (1) Close data socket */
	close(datasock);

	/* (2) Mark manager as inactive again */
	managers[thread_index] = 0;

}