#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <netinet/in.h>
#include <unistd.h>
#include <arpa/inet.h>


int main() {
	struct sockaddr_in SockLocale;
	
	int sock = socket(AF_INET, SOCK_STREAM, 0);
	if(sock==-1) exit(-1);
	
	memset(&SockLocale,0,sizeof(struct sockaddr_in));
	SockLocale.sin_family = AF_INET;
	SockLocale.sin_addr.s_addr = htonl(INADDR_ANY);
	SockLocale.sin_port = htons(25);

	if(bind(sock,(struct sockaddr*)&SockLocale,sizeof(struct sockaddr_in)) != -1) {
		if(listen(sock, 100)<0) {
			exit(-1);
		}
	}
	else {
		exit(-1);
	}
	
	while(1) {
		struct sockaddr_in SockDistant;
		char buffer[512];
		
		socklen_t TailleSock = sizeof(SockDistant);
		memset(&SockDistant,0,sizeof(struct sockaddr_in));
		int s_distant = accept(sock,(struct sockaddr*)&SockDistant,&TailleSock);
		if(s_distant!=-1) {
			printf("CONNEXION OK\r\n");
			strcpy(buffer,"Hello world !\r\n");
			write(s_distant,buffer,strlen(buffer));
			printf("String \"Hello world !\" sent\r\n");
			close(s_distant);
		}
	}
}

CONNEXION OK
String "Hello world !" sent
CONNEXION OK
String "Hello world !" sent