sysdis-tp/server.c

#include "server.h"



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

	/* [1] Initialisation
	=========================================================*/
	/* (1) Socket info */
	// Client
	struct sockaddr_in addr_client;
	char client_ip[20];
	int port; // chosen port
	// Socket
	int sock;


	/* (2) Misc. information */
	char* to_send = (char*) malloc( BUFSIZE * sizeof(char) );
	char* to_recv = (char*) malloc( BUFSIZE * sizeof(char) );
	int bytes; // transfer count


	/* [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) Manage optional @message argument */
	if( argc >= 3 ){

		if( strlen(argv[2]) > BUFSIZE || sscanf(argv[2], "%s", to_send) <= 0 ){
			printf("argument error: message must be a string (max: %d characters long)\n", BUFSIZE);
			return 1;
		}

	}else
		strcpy(to_send, "server default message");




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

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


	/* [4] Wait for client message
	=========================================================*/
	/* (1) Listen to data */
	bytes = xlisten(sock, &addr_client, to_recv, BUFSIZE);


	/* (2) Manage error */
	if( bytes == -1 ){
		perror("erreur réception 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));

	/* [5] Send response
	=========================================================*/
	/* (1) Send response */
	bytes = xsend(sock, to_send, &addr_client);

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


	/* [6] Close socket
	=========================================================*/
	close(sock);

	return 0;
}