#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <syslog.h>
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <pthread.h>
#include <signal.h>
#include <sys/wait.h>
/*
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mman.h>
*/
#include <fcntl.h>

// Buffer size, in bytes, used for copying in the Cat() function.
const size_t BUF_SIZE = 4096;

// Typedef for a signal handler function.
typedef void (*signal_handler_t) (int);

// Global variables
char g_program_name[100];	// Initialised from argv[0] in ParseArgs()
struct allowed_ip * allowed_ips = (struct allowed_ip *)NULL;
int quantity_of_fd = 0;		// quantity of file descriptor

static struct connections * connections = (struct connections *)NULL;
pthread_mutex_t mutexsum;

// structs
struct allowed_ip
{
	char * ip;
	struct allowed_ip * next;
};

struct accept
{
	int * fd;
	struct sockaddr_in sa;
	struct in_addr jabber_addr;
	unsigned short jabber_port;
	pthread_t accept_thread;
};

struct client
{
	char * user,
		 * pass;
	int * jabber_fd,
		* read_fd;
	time_t last_access;
};

struct connections
{
	struct client * client;
	struct connections * next;
};

struct read_write
{
	int * jabber,
		client,
		type;
	pthread_t read,
			  write;
};

void recursive (int, struct in_addr, unsigned short);
int getPermission(char *);
void ParseArgs (int, char **, struct in_addr *, unsigned short *, struct in_addr *, unsigned short *);
void Initialise (void);
void sig_child (int);
int CreateServerSocket (struct in_addr, unsigned short);
void Daemonise (void);
void MainLoop (int, struct in_addr, unsigned short);
void ClearList(void);
struct accept * AcceptClientConnection (int);
void VerifyClient(void *);
struct client * Handshake (struct accept *, struct read_write *);
void * withConnections(void * (*func)(), ...);
//struct client * LookFor (char *, char *);
//void * LookFor (struct connections *, char *, char *);
void * LookFor (char *, char *);
void Reading (void *);
void Writing (void *);
int ConnectToServer (struct in_addr, unsigned short);
int NameToAddr (const char *, struct in_addr *);
int NameToPort (const char *, unsigned short *, const char *);
#ifdef __GNUC__
	void quit (const char *, ...) __attribute__ ((format (printf, 1, 2)));
	void pbomb (const char *, ...) __attribute__ ((format (printf, 1, 2)));
	void hbomb (const char *, ...) __attribute__ ((format (printf, 1, 2)));
#else
	void quit (const char *, ...);
	void pbomb (const char *, ...);
	void hbomb (const char *, ...);
#endif
void set_signal_handler (int, signal_handler_t);

int main (int argc, char ** argv)
{
	struct in_addr remote_addr,
				   local_addr;
	unsigned short remote_port,
				   local_port;
	int listen_fd;

	//pthread_t clear_list_thread;

	ParseArgs (argc, argv, &remote_addr, &remote_port, &local_addr, &local_port);

	Initialise ();

	// Create server socket before becoming a daemon so
	// there is still a chance to print an error message.
	listen_fd = CreateServerSocket (local_addr, local_port);
	if ( listen_fd < 0 )
		pbomb ("Unable to create server socket");

	//Daemonise ();

	//pthread_mutex_init(&mutexsum, NULL);
	//pthread_create(&clear_list_thread, NULL, (void *) &ClearList, (void *)NULL );

	//MainLoop (listen_fd, remote_addr, remote_port); // never returns
	recursive(listen_fd, remote_addr, remote_port);

	//pthread_mutex_destroy(&mutexsum);

	exit (EXIT_SUCCESS);
}

void recursive (int listen_fd, struct in_addr rem_addr, unsigned short rem_port)
{
	//while ( 1 )
	//	sleep(1);
	//exit(0);

	pid_t helper_pid;

	syslog (LOG_INFO, "recursive()");

	signal (SIGCHLD, SIG_IGN);

	helper_pid = fork ();
	if ( helper_pid == -1 )
		syslog (LOG_ERR, "fork() on recursive(): %m"), exit (EXIT_FAILURE);

	if ( helper_pid )               /* parent */
	{
		//syslog (LOG_INFO, "Forked child pid %d to help with MainLoop", helper_pid);
		wait(0);                 /* wait for helper to exit */
	}
	else                          /* child (helper) */
	{
		MainLoop (listen_fd, rem_addr, rem_port);

		syslog (LOG_INFO, "exiting");
		exit (0);                 /* helper exits here */
	}
	recursive(listen_fd, rem_addr, rem_port);
}

// ParseArgs()
// Parse the command line arguments to extract the remote
// and local adresses and port numbers, ra, rp, la & lp.
// Exit the program gracefully upon error.
void ParseArgs (int argc, char ** argv, struct in_addr * ra, unsigned short * rp, struct in_addr * la, unsigned short * lp)
{
	// argv[0] = program name
	// argv[1] = remote_addr
	// argv[2] = remote_port
	// argv[3] = local_addr (optional)
	// argv[4] = local_port (optional)

	char * p = strrchr (argv[0], '/');

	strncpy (g_program_name, (p == NULL) ? argv[0] : p + 1, sizeof (g_program_name) - 1);

	if ( (argc < 3) || (argc > 5) )
	{
		fprintf (stderr, "usage: %s remote_addr remote_port [local_addr] [local_port]\n", argv[0]);
		exit (EXIT_FAILURE);
	}

	if ( NameToAddr (argv[1], ra) )
		hbomb ("Unable to resolve \"%s\" to an ip address", argv[1]);

	if ( NameToPort (argv[2], rp, "tcp") )
		quit ("Unable to resolve \"%s\" to a port number", argv[2]);

	if ( argc < 4 )
		la->s_addr = htonl (INADDR_ANY);
	else
		if ( NameToAddr (argv[3], la) )
			hbomb ("Unable to resolve \"%s\" to an ip address", argv[3]);

	if ( argc < 5 )
		memcpy (lp, rp, sizeof (*lp));
	else
		if ( NameToPort (argv[4], lp, "tcp") )
			quit ("Unable to resolve \"%s\" to a port number", argv[4]);
}

int getPermission(char * ip)
{
	struct allowed_ip * allow_ip = allowed_ips;
	int allow = 0;

	while ( !allow && allow_ip != (struct allowed_ip *)NULL )
	{
		//printf("strcmp(%s, %s)\n\n", ip, allow_ip->ip);
		if ( strcmp(ip, allow_ip->ip) == 0 )
			allow = 1;
		else
			allow_ip = allow_ip->next;
	}

	return allow;
}

// Initialise()
// Setup syslog, signal handlers, and other intialisation.
void Initialise (void)
{
	FILE * allowed_ips_fd;
	struct allowed_ip * allow_ip;

	if ( !(allowed_ips_fd = fopen("webjabber.cfg", "r")) )
		syslog (LOG_ERR, "Impossivel abrir o arquivo 'webjabber.cfg'"), exit (EXIT_FAILURE);

	while ( !feof(allowed_ips_fd) )
	{
		char * line = (char *) malloc(16 * sizeof(char));

		bzero(line, 16);
		fgets(line, 16, allowed_ips_fd);

		if ( strlen(line) )
		{
			if ( line[strlen(line) - 1] == '\n' )
				line[strlen(line) - 1] = '\0';

			if ( allowed_ips == (struct allowed_ip *)NULL )
				allow_ip = allowed_ips = (struct allowed_ip *) malloc(sizeof(struct allowed_ip));
			else
			{
				allow_ip = allowed_ips;
				while ( allow_ip->next != (struct allowed_ip *)NULL )
					allow_ip = allow_ip->next;
				allow_ip->next = (struct allowed_ip *) malloc(sizeof(struct allowed_ip));
				allow_ip = allow_ip->next;
			}
			allow_ip->next = (struct allowed_ip *)NULL;
			allow_ip->ip = line;
		}
	}

	char * initial_path = (char *) malloc(128 * sizeof(char));
	getcwd(initial_path, 128);

	openlog (g_program_name, LOG_PID, LOG_USER);
	syslog (LOG_INFO, "%s started in path [#%d] %s", g_program_name, strlen(initial_path), initial_path);

	chdir ("/"); // Change working directory to the root.

	umask (0); // Clear our file mode creation mask

	set_signal_handler (SIGCHLD, sig_child);

	signal (SIGPIPE, SIG_IGN);
}

// sig_child(): Handles SIGCHLD from exiting child processes.
void sig_child (int signo)
{
	pid_t pid;

	(void) signo; // suppress compiler warning

	for ( ; ; )
	{
		pid = waitpid (WAIT_ANY, NULL, WNOHANG);

		if (pid > 0)
			syslog (LOG_INFO, "Caught SIGCHLD from pid %d", pid);
		else
			break;
	}

	if ((pid < 0) && (errno != ECHILD))
		syslog (LOG_ERR, "waitpid(): %m"), exit (EXIT_FAILURE);

	return;
}

// CreateServerSocket()
// Create a socket, bind it to the specified address
// and port, and set it to listen for client connections.
// Returns < 0 on failure to bind, bombs on error otherwise,
// returns the fd of the new socket on success.
int CreateServerSocket (struct in_addr addr, unsigned short port)
{
	int err,
		fd;
	const int on = 1;
	struct sockaddr_in sa;

	// Create a socket and get its descriptor.
	fd = socket (AF_INET, SOCK_STREAM, 0);
	if ( fd < 0 )
		syslog (LOG_ERR, "socket(): %m"), exit (EXIT_FAILURE);

	// Set SO_REUSEADDR socket option
	if ( setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)) < 0 )
		syslog (LOG_ERR, "setsockopt(fd%d, SO_REUSEADDR): %m", fd);

	// Load a sa structure with the specified address and port
	sa.sin_family = AF_INET;
	sa.sin_port = htons (port);
	//sa.sin_addr = addr;
	sa.sin_addr.s_addr = htonl(INADDR_ANY);
	memset (sa.sin_zero, 0, sizeof (sa.sin_zero));

	// Bind our socket to the address and port specified
	err = bind (fd, (struct sockaddr *) &sa, sizeof (sa));
	if ( err < 0 )
	{
		syslog (LOG_ERR, "bind(): %m");
		return err;
	}

	// Tell socket to listen and queue up to 5 incoming connections.
	if ( listen (fd, 5) < 0 )
		syslog (LOG_ERR, "listen(): %m"), exit (EXIT_FAILURE);

	return fd;
}

// Daemonise(): Put the program in the background, set PPID=1, create a new
// session and process group, without a controlling tty.
void Daemonise (void)
{
	pid_t pid;

	/* Close stdin, stdout & stderr */
	/* TODO: open /dev/null and dup the fd to stdin, stdout & stderr
	 *      close(STDIN_FILENO);
	 *           close(STDOUT_FILENO);
	 *                close(STDERR_FILENO);
	 *                   */

	syslog (LOG_INFO, "%s daemonising", g_program_name);

	/* Fork the process to put it in the background. */

	pid = fork ();
	if (pid == -1)
		syslog (LOG_ERR, "fork(): %m"), exit (EXIT_FAILURE);

	/* parent terminates here, so shell thinks the command is done. */
	if (pid)
		exit (0);

	syslog (LOG_INFO, "%s in background", g_program_name);

	/* 1st child continues to run in the background with PPID=1 */

	/* Become leader of a new session and a new process group,
	 *      with no controlling tty.  */
	setsid ();

	/* Fork again to guarantee the process will not be able to aquire a
	 *      controlling tty. */

	/*signal (SIGHUP, SIG_IGN); *//* required according to Stevens' UNP2 p333 */

	pid = fork ();
	if (pid == -1)
		syslog (LOG_ERR, "fork(): %m"), exit (EXIT_FAILURE);

	if (pid)                      /* 1st child terminates */
		exit (0);

	/* 2nd child continues, no longer a session or group leader */

	syslog (LOG_INFO, "%s daemonised", g_program_name);
}

// MainLoop()
// Classic concurrent server model.
// Wait for a client to connect, fork a child process
// to do the business with the client, parent process
// continues to wait for the next connection.
// This function does not return.
void MainLoop (int listen_fd, struct in_addr rem_addr, unsigned short rem_port)
{
	//pid_t helper_pid;
	pthread_t clear_list_thread;

	syslog (LOG_INFO, "MainLoop :: listen_fd(fd%d)", listen_fd);
	//signal (SIGCHLD, SIG_IGN);

	pthread_mutex_init(&mutexsum, NULL);
	pthread_create(&clear_list_thread, NULL, (void *) &ClearList, (void *)NULL );
	while ( quantity_of_fd < 50 )
	{
		struct accept * client;

		syslog (LOG_INFO, "[timestamp = %d] quantity_of_fd = %d", time(NULL), quantity_of_fd);

		client = AcceptClientConnection (listen_fd);
		client->jabber_addr = rem_addr;
		client->jabber_port = rem_port;

		pthread_create(&client->accept_thread, NULL, (void *) &VerifyClient, (void *) client);
	}
	pthread_mutex_destroy(&mutexsum);
}

void ClearList(void)
{
	for ( ; ; )
	{
		pthread_mutex_lock(&mutexsum);
		struct connections * connection = connections;
		while ( connection != (struct connections *)NULL )
		{
			if ( *(connection->client->jabber_fd) != (int)NULL && time(NULL) - connection->client->last_access > 70 )
			{
				shutdown(*(connection->client->jabber_fd), SHUT_RDWR);
				close(*(connection->client->jabber_fd));
				*(connection->client->jabber_fd) = (int)NULL;
			}
			connection = connection->next;
		}
		pthread_mutex_unlock(&mutexsum);
		sleep(5);
	}
}

// AcceptClientConnection()
// waits for a tcp connect to the socket listen_fd, which
// must already be bound and set to listen on a local port.
// Bombs on error, returns the fd of the new socket on success.
//int AcceptClientConnection (int listen_fd)
struct accept * AcceptClientConnection (int listen_fd)
{
	int * newfd = (int *) malloc(sizeof(int));
	if ( newfd == NULL )
	{
		syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);
	}

	struct sockaddr_in sa;
	socklen_t socklen;

	syslog (LOG_INFO, "AcceptClientConnection(fd%d)", listen_fd);

	// Accept the connection and create a new socket for it.
	socklen = sizeof (sa);
	memset (&sa, 0, socklen);
	do
	{
		*(newfd) = accept (listen_fd, (struct sockaddr *) &sa, &socklen);
	}
	while ( (*(newfd) < 0) && (errno == EINTR) );

	syslog (LOG_INFO, "Accepted client connection on new socket fd%d", *(newfd));

	if ( *(newfd) < 0 )
		syslog (LOG_ERR, "accept(): %m"), exit (EXIT_FAILURE);

	if ( socklen != sizeof (sa) )
		syslog (LOG_ERR, "accept() screwed up!"), exit (EXIT_FAILURE);

	quantity_of_fd++;

	const int on = 1;
	if ( setsockopt (*(newfd), SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)) < 0 )
		syslog (LOG_ERR, "setsockopt(fd%d, SO_REUSEADDR): %m", *(newfd));

	struct accept * accepted = (struct accept *) malloc(sizeof(struct accept));
	if ( accepted == NULL )
		syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

	accepted->fd = newfd;
	accepted->sa = sa;

	return (accepted);
}

void VerifyClient(void * accepted)
{
	//puts("\n\n:::::::::::::::: VERIFYCLIENT :::::::::::::::::::::\n");
	unsigned int addr = 0;
	char ip[250];
	int * jabber_fd = (int *)NULL;
	const int on = 1;

	struct accept * accept = (struct accept *) accepted;
	struct client * client = (struct client *)NULL;
	struct read_write * read_write = (struct read_write *) malloc(sizeof(struct read_write));
	if ( read_write == NULL )
		syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

	read_write->type = 0;

	// ip from client
	addr = ntohl(accept->sa.sin_addr.s_addr);
	sprintf(ip, "%d.%d.%d.%d",
			(addr >> 24), (addr >> 16) & 0xFF,
			(addr >> 8) & 0xFF,  addr & 0xFF);
	//printf("\nNew connection [#%d]: %s\n", *(accept->fd), ip);

	if ( getPermission(ip) )
		if ( (client = Handshake(accept, read_write)) == (struct client *)NULL )
		{
			close(*(accept->fd));
			pthread_kill(accept->accept_thread, 0);
		}
		else
		{
			jabber_fd = client->jabber_fd;
		}
	else
	{
		jabber_fd = (int *) malloc(sizeof(int));
		if ( jabber_fd == NULL )
			syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

		*(jabber_fd) = (int)NULL;
	}

	//puts("\n\n:::::::::::::::: JABBER IN VERIFYCLIENT #1 :::::::::::::::::::::\n");
	if ( *(jabber_fd) == (int)NULL )
		*(jabber_fd) = ConnectToServer(accept->jabber_addr, accept->jabber_port);
	//puts("\n\n:::::::::::::::: JABBER IN VERIFYCLIENT #2 :::::::::::::::::::::\n");

	// Set SO_REUSEADDR socket option
	//if ( setsockopt (*(jabber_fd), SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)) < 0 )
	//	syslog (LOG_ERR, "setsockopt(fd%d, SO_REUSEADDR) #2: %m", *(jabber_fd));

	//if ( client != (struct client *)NULL )
	//	client->jabber_fd = jabber_fd;

	read_write->jabber = jabber_fd;
	read_write->client = *(accept->fd);
	//pthread_t cat_thread;
	//fcntl(read_write->client, F_SETFL, fcntl(read_write->client, F_GETFL, 0) | O_NDELAY);

	//puts("\n\n:::::::::::::::: THREADS :::::::::::::::::::::\n");
	//pthread_create(&read_write->write, NULL, (void *) &Writing, (void *)read_write );
	pthread_create(&read_write->read, NULL, (void *) &Reading, (void *)read_write );

	//pthread_exit(0);
	pthread_kill(accept->accept_thread, 0);
}

struct client * Handshake(struct accept * accept, struct read_write * read_write)
{
	//puts("\n\n:::::::::::::::: HANDSHAKE :::::::::::::::::::::\n");
	struct client * client = (struct client *)NULL;
	unsigned char * const buf = (char *) malloc (sizeof(char) * 5);
	if ( buf == NULL )
		syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

	char * str = (char *) malloc(128 * sizeof(char)),
		 * user = (char *)NULL,
		 * pass = (char *)NULL,
		 * pass_pos = (char *)NULL,
		 * type = (char *)NULL,
		 * type_pos = (char *)NULL;
	if ( str == NULL )
		syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

	int bytes_rcvd,
		bytes_sent,
		i;

	bzero(str, 128);

	if ( (bytes_rcvd = recv (*(accept->fd), str, 128, 0)) < 1 )
	{
		//puts("error :: str");
		close(*(accept->fd));
		return client;
	}

	pass_pos = strstr(str, "##") + 2;
	i = strlen(str) - strlen(pass_pos) - 1;
	user = (char *) malloc(i * sizeof(char));
	if ( user == NULL )
		syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

	bzero(user, i);
	strncpy(user, str, i - 1);

	type_pos = strstr(pass_pos, "##") + 2;
	i = strlen(pass_pos) - strlen(type_pos) - 1;
	pass = (char *) malloc(i * sizeof(char));
	if ( pass == NULL )
		syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

	bzero(pass, i);
	strncpy(pass, pass_pos, i - 1);

	i = strlen(type_pos) + 1;
	type = (char *) malloc(i * sizeof(char));
	if ( type == NULL )
		syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

	bzero(type, i);
	strcpy(type, type_pos);

	printf(" str[%2d]: %s\n", strlen(str), str);
	printf("user[%2d]: %s\n", strlen(user), user);
	printf("pass[%2d]: %s\n", strlen(pass), pass);
	printf("type[%2d]: %s\n", strlen(type), type);
	printf("  fd[%2d]: client\n", *(accept->fd));

	//if ( (client = LookFor (user, pass)) != (struct client *)NULL )
	if ( (client = (struct client *) withConnections(LookFor, user, pass)) != (struct client *)NULL )
	{
		//puts("\n\n:::::::::::::::: INFO #0 :::::::::::::::::::::\n");
		bzero(buf, 5);

		//if ( *(client->read_fd) != (int)NULL )
		//{
		//	shutdown(*(client->read_fd), SHUT_RDWR);
		//	close(*(client->read_fd));
		//}
		//*(client->read_fd) = *(accept->fd);

		//puts("\n\n:::::::::::::::: INFO #1 :::::::::::::::::::::\n");
		if ( *(client->jabber_fd) == (int)NULL )
		{
			//puts("\n\n:::::::::::::::: JABBER IN HANDSHAKE #1 :::::::::::::::::::::\n");
			*(client->jabber_fd) = ConnectToServer(accept->jabber_addr, accept->jabber_port);
			sprintf(buf, "new ");
			//puts("\n\n:::::::::::::::: JABBER IN HANDSHAKE #2 :::::::::::::::::::::\n");
		}
		else
			sprintf(buf, "rec ");

		//puts("\n\n:::::::::::::::: INFO #2 :::::::::::::::::::::\n");

		//printf("connection: %s\n\n\n", buf);
		for ( i = 0; i < sizeof(buf); i += bytes_sent )
		{
			bytes_sent = send (*(accept->fd), buf + i, sizeof(buf) - i, 0);

			if ( bytes_sent < 0 )
				break;
		}

		//puts("\n\n:::::::::::::::: INFO #3 :::::::::::::::::::::\n");

		if ( strcmp(type, "read") == 0 )
			read_write->type = 1;
		else
			if ( strcmp(type, "write") == 0 )
				read_write->type = 2;
		//puts("\n\n:::::::::::::::: INFO #4 :::::::::::::::::::::\n");

	}
	//free(str);
	free(buf);

	return client;
}

void * withConnections(void * (*func)(), ...)
{
	//static struct connections * connections = (struct connections *)NULL;
	if ( (*func) == LookFor )
	{
		va_list ap;
		char * user,
			 * pass;
		void * _return;

		va_start(ap, (*func));
		user = va_arg(ap, char *);
		pass = va_arg(ap, char *);
		va_end(ap);

		pthread_mutex_lock(&mutexsum);
		_return = (*func)(user, pass);
		pthread_mutex_unlock(&mutexsum);
		return _return;
	}
	else
	{
	}
}

//struct client * LookFor (char * user, char * pass)
//void * LookFor (struct connections * connections, char * user, char * pass)
void * LookFor (char * user, char * pass)
{
	//puts("\n\n:::::::::::::::: LOOKFOR :::::::::::::::::::::\n");
	//static struct connections * connections = (struct connections *)NULL;

	//pthread_mutex_lock(&mutexsum);
	if ( connections == (struct connections *)NULL )
	{
		//puts("\n\n:::::::::::::::: FIRST CONNECTION :::::::::::::::::::::\n");
		connections = (struct connections *) malloc(sizeof(struct connections));
		if ( connections == NULL )
			syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

		connections->client = (struct client *) malloc(sizeof(struct client));
		if ( connections->client == NULL )
			syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

		connections->client->user = user;
		connections->client->pass = pass;

		connections->client->read_fd = (int *) malloc(sizeof(int));
		if ( connections->client->read_fd == NULL )
			syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

		connections->client->jabber_fd = (int *) malloc(sizeof(int));
		if ( connections->client->jabber_fd == NULL )
			syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

		*(connections->client->read_fd) = (int)NULL;
		*(connections->client->jabber_fd) = (int)NULL;

		connections->client->last_access = time(NULL);

		connections->next = (struct connections *)NULL;

		//pthread_mutex_unlock(&mutexsum);
		return connections->client;
	}
	else
	{
		//puts("\n\n:::::::::::::::: HAS CONNECTION :::::::::::::::::::::\n");
		struct connections * connection = connections,
						   * last;
		while ( connection != (struct connections *)NULL )
		{
			//puts(":::::::::::::::: PROCURANDO :::::::::::::::::::::");
			if ( strcmp(connection->client->user, user) == 0 )
				if ( strcmp(connection->client->pass, pass) == 0 )
				{
					//pthread_mutex_unlock(&mutexsum);
					//puts(":::::::::::::::: ACHOU #1 :::::::::::::::::::::");
					connection->client->last_access = time(NULL);
					return connection->client;
				}
				else
				{
					//pthread_mutex_unlock(&mutexsum);
					//puts(":::::::::::::::: ACHOU #2 :::::::::::::::::::::");
					return (struct client *)NULL;
				}
			last = connection;
			connection = connection->next;
		}
		//puts(":::::::::::::::: ACHOU #3 :::::::::::::::::::::");

		last->next = (struct connections *) malloc(sizeof(struct connections));
		if ( last->next == NULL )
			syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

		connection = last->next;

		connection->client = (struct client *) malloc(sizeof(struct client));
		if ( connection->client == NULL )
			syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

		connection->client->user = user;
		connection->client->pass = pass;
		connection->client->jabber_fd = (int *) malloc(sizeof(int));
		if ( connection->client->jabber_fd == NULL )
			syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

		*(connection->client->jabber_fd) = (int)NULL;
		connection->client->last_access = time(NULL);

		connection->next = (struct connections *)NULL;
		//pthread_mutex_unlock(&mutexsum);
		return connection->client;
	}
}

void Reading (void * read_write)
{
	unsigned char * const buf_2_jabber = (char *) malloc (sizeof(char) * BUF_SIZE);
	unsigned char * const buf_2_client = (char *) malloc (sizeof(char) * BUF_SIZE);
	bzero(buf_2_jabber, BUF_SIZE);
	bzero(buf_2_client, BUF_SIZE);

	if ( buf_2_jabber == NULL || buf_2_client == NULL )
		syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

	struct read_write * read = (struct read_write *) read_write;

	int jabber_fd = *(read->jabber),
		client_fd = read->client;

	fcntl(jabber_fd, F_SETFL, fcntl(jabber_fd, F_GETFL, 0) | O_NDELAY);
	fcntl(client_fd, F_SETFL, fcntl(client_fd, F_GETFL, 0) | O_NDELAY);

	int bytes_rcvd_jabber = (int) NULL,
		bytes_sent_jabber = (int) NULL,
		bytes_rcvd_client = (int) NULL,
		bytes_sent_client = (int) NULL,
		i,
		do_auth = 0;

	// @TODO: verificar alocacao buffer
	//if ( buf == NULL )
	//	syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

	do
	{
		bzero(buf_2_jabber, BUF_SIZE);
		bytes_rcvd_client = recv (client_fd, buf_2_jabber, BUF_SIZE, 0);
		if ( (bytes_rcvd_client != 0) && (strlen(buf_2_client) > 0) )
		{
			for ( i = 0; i < bytes_rcvd_jabber; i += bytes_sent_client )
			{
				bytes_sent_client = send (client_fd, buf_2_client + i, bytes_rcvd_jabber - i, 0);

				if ( bytes_sent_client < 0 )
					break;
			}
		}
		if ( strlen(buf_2_jabber) > 0 )
		{
			printf("(client/jabber[#%d])[%d]:\n{\n%s.......\n}\n", jabber_fd, strlen(buf_2_jabber), buf_2_jabber);
			if ( strstr(buf_2_jabber, "<?xml") != NULL )
				do_auth = 1;
		}

		bzero(buf_2_client, BUF_SIZE);
		if ( do_auth || read->type == 1 )
			bytes_rcvd_jabber = recv (jabber_fd, buf_2_client, BUF_SIZE, 0);
		else
			bytes_rcvd_jabber = -1;
		if ( (bytes_rcvd_jabber != 0) && (strlen(buf_2_jabber) > 0) )
		{
			for ( i = 0; i < bytes_rcvd_client; i += bytes_sent_jabber )
			{
				bytes_sent_jabber = send (jabber_fd, buf_2_jabber + i, bytes_rcvd_client - i, 0);

				if ( bytes_sent_jabber < 0 )
					break;
			}
		}
		if ( strlen(buf_2_client) > 0 )
		{
			if ( do_auth && strstr(buf_2_jabber, "<iq xmlns='jabber:client'") != NULL )
				do_auth = 0;
			printf("(jabber/client[#%d])[%d]:\n{\n%s.......\n}\n", client_fd, strlen(buf_2_client), buf_2_client);
		}

		usleep(500);
	}
	while ( (bytes_rcvd_client != 0) && (bytes_rcvd_jabber != 0) );

	puts("\n\n\nFIM.......................\n\n\n");

	free(buf_2_jabber);
	free(buf_2_client);

	shutdown(read->client, SHUT_RDWR);
	close (read->client);
}

/*
void Reading (void * read_write)
{
	struct read_write * read = (struct read_write *) read_write;

	//printf("read->type: %d\n\n\n", read->type);
	if ( !read->type || read->type == 1 )
	{
		unsigned char * const buf = (char *) malloc (sizeof(char) * BUF_SIZE);
		if ( buf == NULL )
		{
			puts("\n\nmalloc() : buf #2\n\n\n");
			exit (EXIT_FAILURE);
		}
		int bytes_rcvd,
			bytes_sent = (int) NULL,
			i;

		int in_fd = *(read->jabber),
			out_fd = read->client;

		//syslog (LOG_INFO, "Reading(fd%d, fd%d)", in_fd, out_fd);

		// @TODO: verificar alocacao buffer
		//if ( buf == NULL )
		//	syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

		do
		{
			//puts("\n\n:::::::::::::::: DO - READ :::::::::::::::::::::\n");
			bzero(buf, BUF_SIZE);
			bytes_rcvd = recv (in_fd, buf, BUF_SIZE, 0);

			if ( strlen(buf) > 0 )
			{
				// descomentar para ver oq esta passado de informacao
				printf("Reading(#%d/jabber,#%d/client)[%d]:\n{\n%s.......\n}\n", in_fd, out_fd, strlen(buf), buf);

				for ( i = 0; i < bytes_rcvd && *(read->jabber) != (int)NULL; i += bytes_sent )
				{
					bytes_sent = send (out_fd, buf + i, bytes_rcvd - i, 0);

					if ( bytes_sent < 0 )
						break;
				}
			}
		}
		while ( (bytes_rcvd > 0) && (bytes_sent > 0) );

		printf("\n[Reading] FINALIZANDO TREAD CLIENTE COM FD #%d\n\n", out_fd);
		pthread_cancel(read->write);

		//if ( bytes_rcvd < 1 )
		//	*(read->jabber) = (int)NULL;

		printf("\n\nFIM Reading [#%d#%d]\nbytes_rcvd = %d : bytes_sent = %d\n\n\n", in_fd, out_fd, bytes_rcvd, bytes_sent);

		free (buf);
	}
	else
		while ( 1 )	usleep(500);

	//pthread_kill(read->write, 0);

	shutdown(read->client, SHUT_RDWR);
	close (read->client);
	//pthread_exit(0);
}
*/

void Writing (void * read_write)
{
	struct read_write * write = (struct read_write *) read_write;

	//printf("write->type: %d\n\n\n", write->type);
	//if ( !write->type || write->type == 2 )
	//{
		unsigned char * const buf = (char *) malloc (sizeof(char) * (BUF_SIZE + 1));
		if ( buf == NULL )
		{
			syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);
		}
		int bytes_rcvd,
			bytes_sent = (int) NULL,
			i;

		int in_fd = write->client,
			out_fd = *(write->jabber);

		//syslog (LOG_INFO, "Writing(fd%d, fd%d)", in_fd, out_fd);

		// @TODO: verificar alocacao buffer
		//if ( buf == NULL )
		//	syslog (LOG_ERR, "malloc(): %m"), exit (EXIT_FAILURE);

		do
		{
			//puts("\n\n:::::::::::::::: DO - WRITE :::::::::::::::::::::");
			bzero(buf, BUF_SIZE + 1);
			//puts(":::::::::::::::: WRITE - RECV :::::::::::::::::::::");
			bytes_rcvd = recv (in_fd, buf, BUF_SIZE, 0);

			//puts(":::::::::::::::: WRITE - IF #1 :::::::::::::::::::::");
			if ( strlen(buf) > 0 )
			{
				// descomentar para ver oq esta passado de informacao
				//printf("Writing(#%d/client,#%d/jabber)[%d]:\n{\n%s.......\n}\n", in_fd, out_fd, strlen(buf), buf);

				for ( i = 0; i < bytes_rcvd && *(write->jabber) != (int)NULL; i += bytes_sent )
				{
					bytes_sent = send (out_fd, buf + i, bytes_rcvd - i, 0);

					if ( bytes_sent < 0 )
						break;
				}
			}
			//puts(":::::::::::::::: WRITE - IF #2 :::::::::::::::::::::\n");
		}
		while ( (bytes_rcvd > 0) && (bytes_sent > 0) );

		//printf("\n[Writing] FINALIZANDO TREAD CLIENTE COM FD #%d\n\n", in_fd);
		pthread_cancel(write->read);

		//if ( bytes_sent < 1 )
		//	*(write->jabber) = (int)NULL;

		//printf("\n\nFIM Writing [#%d#%d]\nbytes_rcvd = %d : bytes_sent = %d\n\n\n", in_fd, out_fd, bytes_rcvd, bytes_sent);

		free (buf);
	//}
	//else
	//	while ( 1 ) usleep(500);

	//pthread_kill(write->read, 0);

	shutdown(write->client, SHUT_RDWR);
	close (write->client);
	//pthread_exit(0);
}

// ConnectToServer()
// attempts a tcp connect to the server specified
// by addr and port.  Bombs on failure to connect,
// returns the fd of the new socket on success.
int ConnectToServer (struct in_addr addr, unsigned short port)
{
	// TODO: have a timeout for connect() - see Unix socket FAQ 6.2

	int fd, err;
	struct sockaddr_in sa;

	// Create a socket and get its descriptor.
	fd = socket (AF_INET, SOCK_STREAM, 0);

	if ( fd < 0 )
		syslog (LOG_ERR, "socket(): %m"), exit (EXIT_FAILURE);

	sa.sin_family = AF_INET;
	sa.sin_port = htons (port);
	sa.sin_addr = addr;
	memset (sa.sin_zero, 0, sizeof (sa.sin_zero));

	err = connect (fd, (struct sockaddr *) &sa, sizeof (sa));
	if (err < 0)
	{
		syslog (LOG_ERR, "Unable to connect socket fd%d to server: %m", fd);
		exit (EXIT_FAILURE);
	}

	quantity_of_fd++;
	syslog (LOG_INFO, "Connected socket fd%d to server", fd);

	return fd;
}

// NameToAddress()
// Convert name to an ip address.
// Returns 0 on success, -1 on failure.
int NameToAddr (const char * name, struct in_addr * p_inaddr)
{
	struct hostent * he;

	// First, attempt to convert from string ip format
	// TODO: use inet_aton() instead
	p_inaddr->s_addr = inet_addr (name);
	if ( p_inaddr->s_addr != -1U ) // Success
		return 0;

	// Next, attempt to read from /etc/hosts or do a DNS lookup
	he = gethostbyname (name);
	if ( he != NULL ) // Success
	{
		memcpy (p_inaddr, he->h_addr, sizeof (struct in_addr));
		return 0;
	}

	return -1; // Failed to resolve name to an ip address
}

// NameToPort()
// Convert name to a port number. Name can either be a port name
// (in which case proto must also be set to either "tcp" or "udp")
// or name can be the ascii representation of the port number.
// Returns 0 on success, -1 on failure.
int NameToPort (const char * name, unsigned short * port, const char * proto)
{
	unsigned long lport;
	char * errpos;
	struct servent * se;

	// First, attempt to convert string to integer
	lport = strtoul (name, &errpos, 0);
	if ( (*errpos == 0) && (lport <= 65535) ) // Success
	{
		*port = lport;
		return 0;
	}

	// Next, attempt to read the string from /etc/services
	se = getservbyname (name, proto);
	if ( se != NULL) // Success
	{
		*port = ntohs (se->s_port);
		return 0;
	}

	return -1; // Failed to resolve port name to a number
}

// quit()
// Print an error message to stderr
// and syslog, then exit the program.
void quit (const char * fmt, ...) // quit with msg
{
	va_list ap;

	fflush (stdout);

	fprintf (stderr, "%s: ", g_program_name);

	va_start (ap, fmt);
	vfprintf (stderr, fmt, ap);
	va_end (ap);

	fputc ('\n', stderr);

	syslog (LOG_ERR, "I quit!");

	exit (EXIT_FAILURE);
}

// pbomb()
// Print an error message to stderr
// and syslog, then exit the program.
// pbomb() additionally include the
// string representation of errno.
void pbomb (const char * fmt, ...) // bomb with perror
{
	va_list ap;
	int errno_save = errno;
	char buf[100];

	fflush (stdout);

	fprintf (stderr, "%s: ", g_program_name);

	va_start (ap, fmt);
	vsnprintf (buf, sizeof (buf), fmt, ap);
	va_end (ap);

	errno = errno_save;
	perror (buf);

	syslog (LOG_ERR, "Bang!: %s: %m", buf);

	exit (EXIT_FAILURE);
}

// hbomb()
// Print an error message to stderr
// and syslog, then exit the program.
// hbomb() additionally include the
// string representation of h_errno.
void hbomb (const char * fmt, ...) // bomb with herror
{
	va_list ap;
	int h_errno_save = h_errno;
	char buf[100];

	fflush (stdout);

	fprintf (stderr, "%s: ", g_program_name);

	va_start (ap, fmt);
	vsnprintf (buf, sizeof (buf), fmt, ap);
	va_end (ap);

	h_errno = h_errno_save;
	herror (buf);

	syslog (LOG_ERR, "Bang!: %s: %s", buf, hstrerror (h_errno));

	exit (EXIT_FAILURE);
}

// set_signal_handler(): Sets a signal handler function.  Similar to signal()
// but this method is more portable between platforms.
void set_signal_handler (int signum, signal_handler_t sa_handler_func)
{
	struct sigaction act;

	act.sa_handler = sa_handler_func;
	sigemptyset (&(act.sa_mask));
	act.sa_flags = 0;

	if (sigaction (signum, &act, NULL) < 0)
	{
		syslog (LOG_ERR, "Error setting handler for signal %d: %m", signum);
		exit (EXIT_FAILURE);
	}
}