sysdis-tp/server.c

#include "server.h"



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

	/* [1] Initialisation
	=========================================================*/
	/* (1) Socket info */
	// Client
	static struct sockaddr_in addr_client;
	// Client identifier
	struct hostent *host_client = NULL;
	char client_ip[20];
	// Socket
	int sock;


	/* (2) Misc. information */
	// response
	char *response = "bien recu";
	// reception buffer
	char buffer[BUFSIZE];
	// received buffer
	char *received;
	// length of received/sent data
	int buf_len;



	/* [2] Create socket
	=========================================================*/
	/* (1) Create socket */
	sock = xbind(4000);

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


	/* [3] Wait for client message
	=========================================================*/
	buf_len = xlisten(sock, (struct sockaddr*) &addr_client, buffer, BUFSIZE);


	/* (1-) Manage error */
	if( buf_len == -1 ){
		perror("erreur réception paquet");
		exit(1);
	}

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

	/* (2) Fetch client information */
	// récupère nom de la machine émettrice des données
	host_client = gethostbyaddr(    &addr_client.sin_addr, // ) client addr (filled)
			        /* ( */ sizeof(struct in_addr),       // ) sizeof addr
			        /* ( */ AF_INET                ); // ipv4

	/* (2-) Manage error */
	if( host_client == NULL ){
		perror("erreur gethostbyaddr");
		exit(1);
	} 

	/* (3) Store message */
	received = (char *) malloc(buf_len * sizeof(char));
	memcpy(received, buffer, buf_len);

	printf( "recu message %s de %s:%d\n", received, client_ip, ntohs(addr_client.sin_port) );

	/* [4] Send response
	=========================================================*/
	/* (1) Send response */
	xsend(sock, response, (struct sockaddr*)&addr_client);

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

	/* [5] Close socket
	=========================================================*/
	close(sock);
}