#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <time.h>
 
int socketfd, newsocket;
char *filename;
 
void shutup (int signal)
{
	FILE *log;
	log=fopen (filename, "a+");
	times ();
	fprintf (log, "Shutting down...\n\n");
	fclose (log);
	close (newsocket);
	close (socketfd);
	exit (0);
}
 
int times ()
{
	FILE *log;
	time_t now=time (0);
	struct tm *ahora;
	char buffer [40];
	ahora=localtime ((const time_t*)&now);
	strftime (buffer, 40, "%d/%m/%Y %H:%M:%S", ahora);
	log=fopen (filename, "a+");
	printf ("%s  ", buffer);
	fprintf (log,"%s ", buffer);
	fclose (log);
	return 0;
}
 
int main (int argc, char *argv [])
{
	time_t now=time (0);
	struct tm *ahora;
	char hora [40];
	ahora=localtime ((const time_t*)&now);
	strftime (hora, 40, "%d/%m/%Y %H:%M:%S" , ahora);
	printf ("SmallServ 2.0 : By Sagrini : Sagrini2010 : %s\n", hora);
	if (getuid()!=0)
	{
		printf ("This proccess must be run by root.\n\n");
		return 1;
	}
	if (argc<3)
	{
		printf ("Use: %s <PORT> <LOG>\n\n", argv[0]);
		return 1;
	}
	int cont;
	FILE *log;
	struct sockaddr_in client, host;
	char buffer [1024];
	int size=sizeof (client);
	filename = argv [2];
	socketfd=socket (2, 1 , 0);
	host.sin_family=AF_INET;
	host.sin_port=htons (atoi (argv [1]));
	host.sin_addr.s_addr=0;
	bind (socketfd, (struct sockaddr*)&host, sizeof(struct sockaddr));
	listen (socketfd, 3);
	log=fopen (filename, "a+");
	times ();
	fprintf (log, "Starting up...\n\n");
	fclose (log);
	signal (SIGTERM, shutup);
	signal (SIGINT, shutup);
	daemon (1, 0);
	while (1)
	{
		newsocket=accept (socketfd, (struct sockaddr*)&client, &size);
		log=fopen (filename, "a+");
		times ();
		fprintf (log, "Got connection from %s:%d\n", inet_ntoa (client.sin_addr), ntohs (client.sin_port));
		fclose (log);
		cont=recv (newsocket, &buffer, 1024, 0);
		while (cont>2)
		{
			log=fopen (filename, "a+");
			times ();
			buffer [cont-1] = '\0';
			fprintf (log, "RECV %d bytes: %s\n", cont-2, buffer);
			fclose (log);
			cont=recv (newsocket, &buffer, 1024, 0);
		}
		log=fopen (filename, "a+");
		times ();
		fprintf (log, "Finishing connection from %s:%d\n\n", inet_ntoa (client.sin_addr), ntohs(client.sin_port));
		fclose (log);
		close (newsocket);
	}
	close (socketfd);
	return 0;
}
 

#include <stdio.h>
#include <string.h>
 
void getnumbs (char *cadena)
{	int cont;
	for (cont=0; cont<strlen (cadena); cont++)
		if (cadena [cont] >= '0' && cadena [cont] <= '9') printf ("%c", cadena [cont]);
}
 
int main ()
{ getnumbs ("ewiuc3dskhd8nkd62ndsnk9"); return 0; }
 

sagrini@pc10-1:~/Escritorio$ nano code.c
sagrini@pc10-1:~/Escritorio$ gcc -o code code.c
sagrini@pc10-1:~/Escritorio$ ./code
38629juanra@pc10-1:~/Escritorio$ 

38629
Process returned 0 (0x0)     execution time : 0.018 s
Press ENTER to continue.