sysdis-tp/client.c

#include "client.h"



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

	/* [1] Initialization + arguments
	=========================================================*/
	/* (1) Socket information */
	struct sockaddr_in server_addr; // server info
	int sock, // socket
	    port; // chosen port
	char hostname[24]; // chosen hostname
	
	/* (2) Misc. information */
	int bytes; // transfer count
	char* to_send = (char*) malloc( BUFSIZE * sizeof(char) );
	char* to_recv = (char*) malloc( BUFSIZE * sizeof(char) );


	/* [2] Manage arguments
	=========================================================*/
	/* (1) Manage arguments count */
	if( argc < 3 ){
		printf("Missing arguments\nUsage: client hostname port [message]\n");
		return 1;
	}

	/* (2) Manage @hostname argument */
	if( strlen(argv[1]) > 24 || sscanf(argv[1], "%s", hostname) <= 0 ){
		printf("argument error: hostname must be a string (max: 24 characters long)\n");
		return 1;
	}

	/* (3) Manage port argument */
	if( sscanf(argv[2], "%d", &port) <= 0 ){
		printf("argument error: port must be a valid integer\n");
		return 1;
	}

	/* (4) Manage optional @message argument */
	if( argc >= 4 ){

		if( strlen(argv[3]) > BUFSIZE || sscanf(argv[3], "%s", to_send) <= 0 ){
			printf("argument error: message must be a string (max: %d characters long)\n", BUFSIZE);
			return 1;
		}

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

	/* [3] Create UPD socket and get target data
	=========================================================*/
	sock = xconnect(hostname, port, &server_addr);

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


	/* [4] Send message
	=========================================================*/
	/* (1) Send message to server */
	bytes = xwrite(sock, to_send);

	/* (2) Check if send succesfully */
	if( bytes == -1 ){
		perror("erreur envoi message");
		exit(1);
	}

	DEBUG&& printf("*** sent %d bytes\n", bytes);



	/* [5] Wait for response
	=========================================================*/
	/* (1) Wait for response */
	bytes = xread(sock, to_recv, BUFSIZE);

	/* (2) Check if received successfully (and consistently) */
	if( bytes == -1 ){
		perror("erreur réponse serveur");
		exit(1);
	}

	/* (4) log */
	printf("*** received : '%s'\n", to_recv);


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

	return 0;
}