src/protocols/gg/libgg.c

/* $Id: libgg.c 9537 2004-04-23 17:24:19Z lschiere $ */

/*
 *  (C) Copyright 2001 Wojtek Kaniewski <wojtekka@irc.pl>,
 *                     Robert J. Woźny <speedy@ziew.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License Version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <sys/types.h>
#ifndef _WIN32
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <netdb.h>
#include <pwd.h>
#else
#include <fcntl.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/time.h>
#include <errno.h>
#ifndef _AIX
#  include <string.h>
#endif
#include <stdarg.h>
#include <time.h>
#ifdef sun
  #include <sys/filio.h>
#endif
#include <glib.h>
#if G_BYTE_ORDER == G_BIG_ENDIAN
#  define WORDS_BIGENDIAN 1
#endif
#include "libgg.h"

#include "internal.h"
#include "proxy.h"
#include "debug.h"

#ifdef _WIN32
#include "win32dep.h"
#endif

int gg_debug_level = (GG_DEBUG_NET | GG_DEBUG_TRAFFIC | GG_DEBUG_DUMP | GG_DEBUG_FUNCTION | GG_DEBUG_MISC);
int gg_http_use_proxy = 0;
int gg_http_proxy_port = 0;
char *gg_http_proxy_host = NULL;

/* temp -Herman */
static int ping_outstanding = 0;

#ifndef lint 

static char rcsid[]
#ifdef __GNUC__
__attribute__ ((unused))
#endif
= "$Id: libgg.c 9537 2004-04-23 17:24:19Z lschiere $";

#endif 

/*
 * fix32() // funkcja wewnętrzna
 *
 * dla maszyn big-endianowych zamienia kolejność bajtów w ,,long''ach.
 */
static inline unsigned long fix32(unsigned long x)
{
#ifndef WORDS_BIGENDIAN
	return x;
#else
	return (unsigned long)
		(((x & (unsigned long) 0x000000ffU) << 24) |
                 ((x & (unsigned long) 0x0000ff00U) << 8) |
                 ((x & (unsigned long) 0x00ff0000U) >> 8) |
                 ((x & (unsigned long) 0xff000000U) >> 24));
#endif		
}

/*
 * fix16() // funkcja wewnętrzna
 *
 * dla maszyn big-endianowych zamienia kolejność bajtów w ,,short''ach.
 */

static inline unsigned short fix16(unsigned short x)
{
#ifndef WORDS_BIGENDIAN
	return x;
#else
	return (unsigned short)
		(((x & (unsigned short) 0x00ffU) << 8) |
                 ((x & (unsigned short) 0xff00U) >> 8));
#endif
}

#ifndef _WIN32
/*
 * gg_resolve() // funkcja wewnętrzna
 *
 * tworzy pipe'y, forkuje się i w drugim procesie zaczyna resolvować 
 * podanego hosta. zapisuje w sesji deskryptor pipe'u. jeśli coś tam
 * będzie gotowego, znaczy, że można wczytać ,,struct in_addr''. jeśli
 * nie znajdzie, zwraca INADDR_NONE.
 *
 *  - fd - wskaźnik gdzie wrzucić deskryptor,
 *  - pid - gdzie wrzucić pid dzieciaka,
 *  - hostname - nazwa hosta do zresolvowania.
 *
 * zwraca 0 jeśli udało się odpalić proces lub -1 w przypadku błędu.
 */
int gg_resolve(int *fd, int *pid, char *hostname)
{
	int pipes[2], res;
	struct in_addr a;

	gg_debug(GG_DEBUG_FUNCTION, "** gg_resolve(..., \"%s\");\n", hostname);
	
	if (!fd | !pid) {
		errno = EFAULT;
		return -1;
	}

	if (pipe(pipes) == -1)
		return -1;

	if ((res = fork()) == -1)
		return -1;

	if (!res) {
		if ((a.s_addr = inet_addr(hostname)) == INADDR_NONE) {
			struct hostent *he;
		
			if (!(he = gethostbyname(hostname)))
				a.s_addr = INADDR_NONE;
			else
				memcpy((char*) &a, he->h_addr, sizeof(a));
		}

		write(pipes[1], &a, sizeof(a));

		exit(0);
	}

	close(pipes[1]);

	*fd = pipes[0];
	*pid = res;

	return 0;
}
#endif /*!_WIN32*/

/*
 * gg_recv_packet() // funkcja wewnętrzna
 *
 * odbiera jeden pakiet gg i zwraca wskaźnik do niego. pamięć po nim
 * wypadałoby uwolnić.
 *
 *  - sock - połączony socket.
 *
 * jeśli wystąpił błąd, zwraca NULL. reszta w errno.
 */
static void *gg_recv_packet(struct gg_session *sess)
{
	struct gg_header h;
	char *buf = NULL;
	int ret = 0, offset, size = 0;
	int sizeh = sizeof(struct gg_header);

	gg_debug(GG_DEBUG_FUNCTION, "** gg_recv_packet(...);\n");
	
	if (!sess) {
		errno = EFAULT;
		return NULL;
	}

	if (sess->recv_left < 1) {
		while (ret != sizeh) {
			ret = read(sess->fd, &h, sizeh);
			gg_debug(GG_DEBUG_MISC, "-- header recv(..., %d) = %d\n", sizeh, ret);
			if (ret < sizeh) {
				if (errno != EINTR) {
					gg_debug(GG_DEBUG_MISC, "-- errno = %d (%s)\n", errno, strerror(errno));
					return NULL;
				}
			}
		}

		h.type = fix32(h.type);
		h.length = fix32(h.length);
	} else {
		memcpy(&h, sess->recv_buf, sizeh);
	}

	/* jakieś sensowne limity na rozmiar pakietu */
	if (h.length < 0 || h.length > 65535) {
		gg_debug(GG_DEBUG_MISC, "-- invalid packet length (%d)\n", h.length);
		errno = ERANGE;
		return NULL;
	}

	if (sess->recv_left > 0) {
		gg_debug(GG_DEBUG_MISC, "-- resuming last gg_recv_packet()\n");
		size = sess->recv_left;
		offset = sess->recv_done;
		buf = sess->recv_buf;
	} else {
		if (!(buf = malloc(sizeh + h.length + 1))) {
			gg_debug(GG_DEBUG_MISC, "-- not enough memory\n");
			return NULL;
		}

		memcpy(buf, &h, sizeh);

		offset = 0;
		size = h.length;
	}

	while (size > 0) {
		ret = read(sess->fd, buf + sizeh + offset, size);
		gg_debug(GG_DEBUG_MISC, "-- body recv(..., %d) = %d\n", size, ret);
		if (ret > -1 && ret <= size) {
			offset += ret;
			size -= ret;
		} else if (ret == -1) {	
			gg_debug(GG_DEBUG_MISC, "-- errno = %d (%s)\n", errno, strerror(errno));
			if (errno == EAGAIN) {
				gg_debug(GG_DEBUG_MISC, "-- %d bytes received, %d left\n", offset, size);
				sess->recv_buf = buf;
				sess->recv_left = size;
				sess->recv_done = offset;
				return NULL;
			}
			if (errno != EINTR) {
				/* errno = EINVAL; */
				free(buf);
				return NULL;
			}
		}
	}

	sess->recv_left = 0;

	if ((gg_debug_level & GG_DEBUG_DUMP)) {
		int i;

		gg_debug(GG_DEBUG_DUMP, ">> received packet (type=%.2x):", h.type);
		for (i = 0; i < sizeh + h.length; i++) 
			gg_debug(GG_DEBUG_DUMP, " %.2x", (unsigned char) buf[i]);
		gg_debug(GG_DEBUG_DUMP, "\n");
	}

	return buf;
}

/*
 * gg_send_packet() // funkcja wewnętrzna
 *
 * konstruuje pakiet i wysyła go do serwera.
 *
 *  - sock - deskryptor gniazda
 *  - type - typ pakietu
 *  - payload_1 - pierwsza część pakietu
 *  - payload_length_1 - długość pierwszej części
 *  - payload_2 - druga część pakietu
 *  - payload_length_2 - długość drugiej części
 *  - ... - kolejne części pakietu i ich długości
 *  - NULL - końcowym parametr (konieczny!)
 *
 * jeśli się powiodło, zwraca 0, w przypadku błędu -1. jeśli errno == ENOMEM,
 * zabrakło pamięci. inaczej był błąd przy wysyłaniu pakietu. dla errno == 0
 * nie wysłano całego pakietu.
 */
int gg_send_packet(struct gg_session *sess, int type, ...)
{
	struct gg_header *h;
	char *tmp;
	int tmp_length;
	void *payload;
	int payload_length;
	va_list ap;
	int res;

	gg_debug(GG_DEBUG_FUNCTION, "** gg_send_packet(%p, 0x%.2x, ...)\n", sess, type);

	tmp_length = 0;

	if (!(tmp = malloc(sizeof(struct gg_header)))) {
		gg_debug(GG_DEBUG_MISC, "// gg_send_packet() not enough memory for packet header\n");
		return -1;
	}

	h = (struct gg_header*) tmp;
	h->type = fix32(type);
	h->length = fix32(0);

	va_start(ap, type);

	payload = va_arg(ap, void *);

	while (payload) {
		char *tmp2;

		payload_length = va_arg(ap, int);

		if (payload_length < 0)
			gg_debug(GG_DEBUG_MISC, "// gg_send_packet() invalid payload length (%d)\n", payload_length);
	
		if (!(tmp2 = realloc(tmp, sizeof(struct gg_header) + tmp_length + payload_length))) {
                        gg_debug(GG_DEBUG_MISC, "// gg_send_packet() not enough memory for payload\n");
			free(tmp);
			va_end(ap);
                        return -1;
                }

		tmp = tmp2;
		
		memcpy(tmp + sizeof(struct gg_header) + tmp_length, payload, payload_length);
		tmp_length += payload_length;

		payload = va_arg(ap, void *);
	}

	va_end(ap);

	h = (struct gg_header*) tmp;
	h->length = fix32(tmp_length);

	if ((gg_debug_level & GG_DEBUG_DUMP)) {
                unsigned int i;
		
                gg_debug(GG_DEBUG_DUMP, "// gg_send_packet(0x%.2x)", fix32(h->type));
                for (i = 0; i < sizeof(struct gg_header) + fix32(h->length); i++)
                        gg_debug(GG_DEBUG_DUMP, " %.2x", (unsigned char) tmp[i]);
                gg_debug(GG_DEBUG_DUMP, "\n");
        }
	
	tmp_length += sizeof(struct gg_header);
	
	if ((res = gg_write(sess, tmp, tmp_length)) < tmp_length) {
		gg_debug(GG_DEBUG_MISC, "// gg_send_packet() write() failed. res = %d, errno = %d (%s)\n", res, errno, strerror(errno));
		free(tmp);
		return -1;
	}
	
	free(tmp);	
	return 0;
}

/*
 * gg_write() // funkcja pomocnicza
 *
 * zapisuje do gniazda określoną ilość bajtów. bierze pod uwagę, czy mamy
 * połączenie zwykłe czy TLS.
 *
 *  - sess - sesja,
 *  - buf - bufor,
 *  - length - ilość bajtów,
 *
 * takie same wartości jak write().
 */
int gg_write(struct gg_session *sess, const char *buf, int length)
{
	int res;

#ifdef __GG_LIBGADU_HAVE_OPENSSL
	if (sess->ssl) {
		int err;

		res = SSL_write(sess->ssl, buf, length);

		if (res < 0) {
			err = SSL_get_error(sess->ssl, res);

			if (err == SSL_ERROR_WANT_WRITE)
				errno = EAGAIN;

			return -1;
		}
	} else
#endif
		res = write(sess->fd, buf, length);

	return res;
}


#ifndef _WIN32
/*
 * gg_login()
 *
 * rozpoczyna procedurę łączenia się z serwerem. resztę obsłguje się przez
 * gg_watch_event.
 *
 *  - uin - numerek usera,
 *  - password - jego hasełko,
 *  - async - ma być asynchronicznie?
 *
 * UWAGA! program musi obsłużyć SIGCHLD, jeśli łączy się asynchronicznie,
 * żeby zrobić pogrzeb zmarłemu procesowi resolvera.
 *
 * w przypadku błędu zwraca NULL, jeśli idzie dobrze (async) albo poszło
 * dobrze (sync), zwróci wskaźnik do zaalokowanej struktury `gg_session'.
 */
struct gg_session *gg_login(uin_t uin, char *password, int async)
{
	struct gg_session *sess;
	char *hostname;
	int port;

	gg_debug(GG_DEBUG_FUNCTION, "** gg_login(%u, \"...\", %d);\n", uin, async);

	if (!(sess = malloc(sizeof(*sess))))
		return NULL;

	sess->uin = uin;
	if (!(sess->password = strdup(password))) {
		free(sess);
		return NULL;
	}
	sess->state = GG_STATE_RESOLVING;
	sess->check = GG_CHECK_READ;
	sess->async = async;
	sess->seq = 0;
	sess->recv_left = 0;
	sess->last_pong = 0;
	sess->server_ip = 0;
	sess->initial_status = 0;
        sess->type = GG_SESSION_GG;
	
	if (gg_http_use_proxy) {
		hostname = gg_http_proxy_host;
		port = gg_http_proxy_port;
	} else {
		hostname = GG_APPMSG_HOST;
		port = GG_APPMSG_PORT;
	};

	if (async) {
		if (gg_resolve(&sess->fd, &sess->pid, hostname)) {
			gg_debug(GG_DEBUG_MISC, "-- resolving failed\n");
			free(sess);
			return NULL;
		}
	} else {
		struct in_addr a;

		if ((a.s_addr = inet_addr(hostname)) == INADDR_NONE) {
			struct hostent *he;
	
			if (!(he = gethostbyname(hostname))) {
				gg_debug(GG_DEBUG_MISC, "-- host %s not found\n", hostname);
				free(sess);
				return NULL;
			} else
				memcpy((char*) &a, he->h_addr, sizeof(a));
		}

		if (!(sess->fd = gg_connect(&a, port, 0)) == -1) {
			gg_debug(GG_DEBUG_MISC, "-- connection failed\n");
			free(sess);
			return NULL;
		}

		sess->state = GG_STATE_CONNECTING;

		while (sess->state != GG_STATE_CONNECTED) {
			struct gg_event *e;

			if (!(e = gg_watch_fd(sess))) {
				gg_debug(GG_DEBUG_MISC, "-- some nasty error in gg_watch_fd()\n");
				free(sess);
				return NULL;
			}

			if (e->type == GG_EVENT_CONN_FAILED) {
				errno = EACCES;
				gg_debug(GG_DEBUG_MISC, "-- could not login\n");
				gg_free_event(e);
				free(sess);
				return NULL;
			}

			gg_free_event(e);
		}
	}

	return sess;
}
#endif /*!_WIN32*/

/* 
 * gg_login_hash() // funkcja wewnętrzna
 * 
 * liczy hash z hasła i danego seeda.
 * 
 *  - password - hasło do hashowania
 *  - seed - wartość podana przez serwer
 *
 * hash.
 */
unsigned int gg_login_hash(const unsigned char *password, unsigned int seed)
{
	unsigned int x, y, z;

	y = seed;

	for (x = 0; *password; password++) {
		x = (x & 0xffffff00) | *password;
		y ^= x;
		y += x;
		x <<= 8;
		y ^= x;
		x <<= 8;
		y -= x;
		x <<= 8;
		y ^= x;

		z = y & 0x1F;
		y = (y << z) | (y >> (32 - z));
	}

	return y;
}

/* 
 * gg_free_session()
 *
 * zwalnia pamięć zajmowaną przez opis sesji.
 *
 *  - sess - opis sesji.
 *
 * nie zwraca niczego, bo i po co?
 */
void gg_free_session(struct gg_session *sess)
{
	if (!sess)
		return;

	free(sess->password);
	free(sess);
}

/*
 * gg_change_status()
 *
 * zmienia status użytkownika. przydatne do /away i /busy oraz /quit.
 *
 *  - sess - opis sesji,
 *  - status - nowy status użytkownika.
 *
 * jeśli wysłał pakiet zwraca 0, jeśli nie udało się, zwraca -1.
 */
int gg_change_status(struct gg_session *sess, int status)
{
	struct gg_new_status p;

	if (!sess) {
		errno = EFAULT;
		return -1;
	}

	if (sess->state != GG_STATE_CONNECTED) {
		errno = ENOTCONN;
		return -1;
	}

	gg_debug(GG_DEBUG_FUNCTION, "** gg_change_status(..., %d);\n", status);

	p.status = fix32(status);

	return gg_send_packet(sess, GG_NEW_STATUS, &p, sizeof(p), NULL, 0);
}

/*
 * gg_logoff()
 *
 * wylogowuje użytkownika i zamyka połączenie.
 *
 *  - sock - deskryptor socketu.
 *
 * nie zwraca błędów. skoro się żegnamy, to olewamy wszystko.
 */
void gg_logoff(struct gg_session *sess)
{
	if (!sess)
		return;

	gg_debug(GG_DEBUG_FUNCTION, "** gg_logoff(...);\n");

	if (sess->state == GG_STATE_CONNECTED)
		gg_change_status(sess, GG_STATUS_NOT_AVAIL);
	
	if (sess->fd) {
		shutdown(sess->fd, 2);
		close(sess->fd);
	}
}

/*
 * gg_send_message()
 *
 * wysyła wiadomość do innego użytkownika. zwraca losowy numer
 * sekwencyjny, który można zignorować albo wykorzystać do potwierdzenia.
 *
 *  - sess - opis sesji
 *  - msgclass - rodzaj wiadomości
 *  - recipient - numer adresata
 *  - message - treść wiadomości
 *
 * numer sekwencyjny wiadomości lub -1 w przypadku błędu.
 */
int gg_send_message(struct gg_session *sess, int msgclass, uin_t recipient, const unsigned char *message)
{
	gg_debug(GG_DEBUG_FUNCTION, "** gg_send_message(%p, %d, %u, %p)\n", sess, msgclass, recipient, message);

	return gg_send_message_richtext(sess, msgclass, recipient, message, NULL, 0);
}

/*
 * gg_send_message_richtext()
 *
 * wysyła kolorową wiadomość do innego użytkownika. zwraca losowy numer
 * sekwencyjny, który można zignorować albo wykorzystać do potwierdzenia.
 *
 *  - sess - opis sesji
 *  - msgclass - rodzaj wiadomości
 *  - recipient - numer adresata
 *  - message - treść wiadomości
 *  - format - informacje o formatowaniu
 *  - formatlen - długość informacji o formatowaniu
 *
 * numer sekwencyjny wiadomości lub -1 w przypadku błędu.
 */
int gg_send_message_richtext(struct gg_session *sess, int msgclass, uin_t recipient, const unsigned char *message, const unsigned char *format, int formatlen)
{
	struct gg_send_msg s;

	gg_debug(GG_DEBUG_FUNCTION, "** gg_send_message_richtext(%p, %d, %u, %p, %p, %d);\n", sess, msgclass, recipient, message, format, formatlen);

	if (!sess) {
		errno = EFAULT;
		return -1;
	}
	
	if (sess->state != GG_STATE_CONNECTED) {
		errno = ENOTCONN;
		return -1;
	}

	s.recipient = fix32(recipient);
	if (!sess->seq)
		sess->seq = 0x01740000 | (rand() & 0xffff);
	s.seq = fix32(sess->seq);
	s.msgclass = fix32(msgclass);
	sess->seq += (rand() % 0x300) + 0x300;
	
	if (gg_send_packet(sess, GG_SEND_MSG, &s, sizeof(s), message, strlen(message) + 1, format, formatlen, NULL) == -1)
		return -1;

	return fix32(s.seq);
}

/*
 * gg_ping()
 *
 * wysyła do serwera pakiet typu yeah-i'm-still-alive.
 *
 *  - sess - zgadnij.
 *
 * jeśli nie powiodło się wysłanie pakietu, zwraca -1. otherwise 0.
 */
int gg_ping(struct gg_session *sess)
{
	if (!sess) {
		errno = EFAULT;
		return -1;
	}

	if (sess->state != GG_STATE_CONNECTED) {
		errno = ENOTCONN;
		return -1;
	}

	gg_debug(GG_DEBUG_FUNCTION, "** gg_ping(...);\n");
	
	return gg_send_packet(sess, GG_PING, NULL);
}

/*
 * gg_free_event()
 *
 * zwalnia pamięć zajmowaną przez informację o zdarzeniu
 *
 *  - event - wskaźnik do informacji o zdarzeniu
 *
 * nie ma czego zwracać.
 */
void gg_free_event(struct gg_event *e)
{
	if (!e)
		return;
	if (e->type == GG_EVENT_MSG)
		free(e->event.msg.message);
	if (e->type == GG_EVENT_NOTIFY)
		free(e->event.notify);
	free(e);
}

/*
 * gg_notify()
 *
 * wysyła serwerowi listę ludków, za którymi tęsknimy.
 *
 *  - sess - identyfikator sesji,
 *  - userlist - wskaźnik do tablicy numerów,
 *  - count - ilość numerków.
 *
 * jeśli udało się, zwraca 0. jeśli błąd, dostajemy -1.
 */
int gg_notify(struct gg_session *sess, uin_t *userlist, int count)
{
	struct gg_notify *n;
	uin_t *u;
	int i, res = 0;

	if (!sess) {
		errno = EFAULT;
		return -1;
	}
	
	if (sess->state != GG_STATE_CONNECTED) {
		errno = ENOTCONN;
		return -1;
	}

	gg_debug(GG_DEBUG_FUNCTION, "** gg_notify(..., %d);\n", count);
	
	if (!userlist || !count)
		return 0;
	
	if (!(n = (struct gg_notify*) malloc(sizeof(*n) * count)))
		return -1;
	
	for (u = userlist, i = 0; i < count; u++, i++) { 
		n[i].uin = fix32(*u);
		n[i].dunno1 = 3;
	}
	
	if (gg_send_packet(sess, GG_NOTIFY, n, sizeof(*n) * count, NULL, 0) == -1)
		res = -1;

	free(n);

	return res;
}

/*
 * gg_add_notify()
 *
 * dodaje w locie do listy ukochanych dany numerek.
 *
 *  - sess - identyfikator sesji,
 *  - uin - numerek ukochanej.
 *
 * jeśli udało się wysłać, daje 0. inaczej -1.
 */
int gg_add_notify(struct gg_session *sess, uin_t uin)
{
	struct gg_add_remove a;

	if (!sess) {
		errno = EFAULT;
		return -1;
	}

	if (sess->state != GG_STATE_CONNECTED) {
		errno = ENOTCONN;
		return -1;
	}
	
	gg_debug(GG_DEBUG_FUNCTION, "** gg_add_notify(..., %u);\n", uin);
	
	a.uin = fix32(uin);
	a.dunno1 = 3;
	
	return gg_send_packet(sess, GG_ADD_NOTIFY, &a, sizeof(a), NULL);
}

/*
 * gg_remove_notify()
 *
 * w locie usuwa z listy zainteresowanych.
 *
 *  - sess - id sesji,
 *  - uin - numerek.
 *
 * zwraca -1 jeśli był błąd, 0 jeśli się udało wysłać pakiet.
 */
int gg_remove_notify(struct gg_session *sess, uin_t uin)
{
	struct gg_add_remove a;

	if (!sess) {
		errno = EFAULT;
		return -1;
	}

	if (sess->state != GG_STATE_CONNECTED) {
		errno = ENOTCONN;
		return -1;
	}

	gg_debug(GG_DEBUG_FUNCTION, "** gg_remove_notify(..., %u);\n", uin);
	
	a.uin = fix32(uin);
	a.dunno1 = 3;
	
	return gg_send_packet(sess, GG_REMOVE_NOTIFY, &a, sizeof(a), NULL, 0);
}

/*
 * gg_userlist_request()
 *
 * wysyła żądanie/zapytanie listy kontaktów na serwerze.
 *
 *  - sess - opis sesji
 *  - type - rodzaj zapytania/żądania
 *  - request - treść zapytania/żądania (może być NULL)
 *
 * 0, -1
 */
int gg_userlist_request(struct gg_session *sess, char type, const char *request)
{
	int len;

	if (!sess) {
		errno = EINVAL;
		return -1;
	}
	
	if (!request) {
		sess->userlist_blocks = 1;
		return gg_send_packet(sess, GG_USERLIST_REQUEST, &type, sizeof(type), NULL);
	}
	
	len = strlen(request);

	sess->userlist_blocks = 0;

	while (len > 2047) {
		sess->userlist_blocks++;

		if (gg_send_packet(sess, GG_USERLIST_REQUEST, &type, sizeof(type), request, 2047, NULL) == -1)
			return -1;

		if (type == GG_USERLIST_PUT)
			type = GG_USERLIST_PUT_MORE;

		request += 2047;
		len -= 2047;
	}

	sess->userlist_blocks++;

	return gg_send_packet(sess, GG_USERLIST_REQUEST, &type, sizeof(type), request, len, NULL);
}

/*
 * gg_watch_fd_connected() // funkcja wewnętrzna
 *
 * patrzy na socketa, odbiera pakiet i wypełnia strukturę zdarzenia.
 *
 *  - sock - lalala, trudno zgadnąć.
 *
 * jeśli błąd -1, jeśli dobrze 0.
 */
static int gg_watch_fd_connected(struct gg_session *sess, struct gg_event *e)
{
	struct gg_header *h;
	char *p;

	if (!sess) {
		errno = EFAULT;
		return -1;
	}

	gg_debug(GG_DEBUG_FUNCTION, "** gg_watch_fd_connected(...);\n");

	if (!(h = gg_recv_packet(sess))) {
		gg_debug(GG_DEBUG_MISC, "-- gg_recv_packet failed. errno = %d (%d)\n", errno, strerror(errno));
		return -1;
	}

	p = (void *)h + sizeof(struct gg_header);
	
	
	switch (h->type) {
	    case GG_RECV_MSG:
	    {
		struct gg_recv_msg *r = (void *)p;

		gg_debug(GG_DEBUG_MISC, "-- received a message\n");

		if (h->length >= sizeof(*r)) {
			e->type = GG_EVENT_MSG;
			e->event.msg.msgclass = fix32(r->msgclass);
			e->event.msg.sender = fix32(r->sender);
			e->event.msg.message = strdup((char*) r + sizeof(*r));
			e->event.msg.time = fix32(r->time);
		}
		break;
	    }
	    case GG_NOTIFY_REPLY:
	    {
		struct gg_notify_reply *n = (void *)p;
		int count, i;

		gg_debug(GG_DEBUG_MISC, "-- received a notify reply\n");
		
		e->type = GG_EVENT_NOTIFY;
		if (!(e->event.notify = (void*) malloc(h->length + 2 * sizeof(*n)))) {
			gg_debug(GG_DEBUG_MISC, "-- not enough memory\n");
			free(h);
			return -1;
		}
		count = h->length / sizeof(*n);
		memcpy(e->event.notify, p, h->length);
		e->event.notify[count].uin = 0;
		for (i = 0; i < count; i++) {
			e->event.notify[i].uin = fix32(e->event.notify[i].uin);
			e->event.notify[i].status = fix32(e->event.notify[i].status);
		}
		break;
	    }
	    
	    case GG_NOTIFY_REPLY60:
	    {
		    struct gg_notify_reply60 *n = (void*) p;
		    unsigned int length = h->length, i = 0;

		    gg_debug(GG_DEBUG_MISC, "// gg_watch_fd_connected() received a notify reply\n");

		    e->type = GG_EVENT_NOTIFY60;
		    e->event.notify60 = malloc(sizeof(*e->event.notify60));

		    if (!e->event.notify60) {
			    gg_debug(GG_DEBUG_MISC, "// gg_watch_fd_connected() not enough memory for notify data\n");
			    goto fail;
		    }

		    e->event.notify60[0].uin = 0;
		    
		    while (length >= sizeof(struct gg_notify_reply60)) {
			    uin_t uin = fix32(n->uin);
			    char *tmp;

			    e->event.notify60[i].uin = uin & 0x00ffffff;
			    e->event.notify60[i].status = n->status;
			    e->event.notify60[i].remote_ip = n->remote_ip;
			    e->event.notify60[i].remote_port = fix16(n->remote_port);
			    e->event.notify60[i].version = n->version;
			    e->event.notify60[i].image_size = n->image_size;
			    e->event.notify60[i].descr = NULL;
			    e->event.notify60[i].time = 0;

			    if (GG_S_D(n->status)) {
				    unsigned char descr_len = *((char*) n + sizeof(struct gg_notify_reply60));

				    if (descr_len < length) {
					    if (!(e->event.notify60[i].descr = malloc(descr_len + 1))) {
						    gg_debug(GG_DEBUG_MISC, "// gg_watch_fd_connected() not enough memory for notify data\n");
						    goto fail;
					    }

					    memcpy(e->event.notify60[i].descr, (char*) n + sizeof(struct gg_notify_reply60) + 1, descr_len);
					    e->event.notify60[i].descr[descr_len] = 0;

					    /* XXX czas */
				    }
				    
				    length -= sizeof(struct gg_notify_reply60) + descr_len + 1;
				    n = (void*) ((char*) n + sizeof(struct gg_notify_reply60) + descr_len + 1);
			    } else {
				    length -= sizeof(struct gg_notify_reply60);
				    n = (void*) ((char*) n + sizeof(struct gg_notify_reply60));
			    }

			    if (!(tmp = realloc(e->event.notify60, (i + 2) * sizeof(*e->event.notify60)))) {
				    gg_debug(GG_DEBUG_MISC, "// gg_watch_fd_connected() not enough memory for notify data\n");
				    free(e->event.notify60);
				    goto fail;
			    }

			    e->event.notify60 = (void*) tmp;
			    e->event.notify60[++i].uin = 0;
		    }

		    break;
	    }

	    case GG_STATUS:
	    {
		struct gg_status *s = (void *)p;

		gg_debug(GG_DEBUG_MISC, "-- received a status change\n");

		if (h->length >= sizeof(*s)) {
			e->type = GG_EVENT_STATUS;
			memcpy(&e->event.status, p, h->length);
			e->event.status.uin = fix32(e->event.status.uin);
			e->event.status.status = fix32(e->event.status.status);
		}
		break;
	    }
	    
	    case GG_STATUS60:
	    {
		    struct gg_status60 *s = (void*) p;
		    uint32_t uin;

		    gg_debug(GG_DEBUG_MISC, "// gg_watch_fd_connected() received a status change\n");

		    if (h->length < sizeof(*s))
			    break;

		    uin = fix32(s->uin);

		    e->type = GG_EVENT_STATUS60;
		    e->event.status60.uin = uin & 0x00ffffff;
		    e->event.status60.status = s->status;
		    e->event.status60.remote_ip = s->remote_ip;
		    e->event.status60.remote_port = fix16(s->remote_port);
		    e->event.status60.version = s->version;
		    e->event.status60.image_size = s->image_size;
		    e->event.status60.descr = NULL;
		    e->event.status60.time = 0;

		    if (uin & 0x40000000)
			    e->event.status60.version |= GG_HAS_AUDIO_MASK;

		    if (h->length > sizeof(*s)) {
			    int len = h->length - sizeof(*s);
			    char *buf = malloc(len + 1);

			    if (buf) {
				    memcpy(buf, (char*) p + sizeof(*s), len);
				    buf[len] = 0;
			    }

			    e->event.status60.descr = buf;

			    if (len > 4 && p[h->length - 5] == 0)
				    e->event.status60.time = *((int*) (p + h->length - 4));
		    }

		    break;
	    }

	    case GG_SEND_MSG_ACK:
	    {
		struct gg_send_msg_ack *s = (void *)p;

		gg_debug(GG_DEBUG_MISC, "-- received a message ack\n");

		if (h->length >= sizeof(*s)) {
			e->type = GG_EVENT_ACK;
			e->event.ack.status = fix32(s->status);
			e->event.ack.recipient = fix32(s->recipient);
			e->event.ack.seq = fix32(s->seq);
		}
		break;
	    }

	    case GG_PONG:
	    {
		gg_debug(GG_DEBUG_MISC, "-- received a pong\n");
		ping_outstanding = 0;
		sess->last_pong = time(NULL);
		break;
	    }

	    case GG_USERLIST_REPLY:
	    {
		    gg_debug(GG_DEBUG_MISC, "// gg_watch_fd_connected() received userlist reply\n");

		    if (h->length < 1)
			    break;

		    /* jeśli odpowiedź na eksport, wywołaj zdarzenie tylko
		     * gdy otrzymano wszystkie odpowiedzi */
		    if (p[0] == GG_USERLIST_PUT_REPLY || p[0] == GG_USERLIST_PUT_MORE_REPLY) {
			    if (--sess->userlist_blocks)
				    break;

			    p[0] = GG_USERLIST_PUT_REPLY;
		    }

		    if (h->length > 1) {
			    char *tmp;
			    int len = (sess->userlist_reply) ? strlen(sess->userlist_reply) : 0;
			    
			    gg_debug(GG_DEBUG_MISC, "userlist_reply=%p, len=%d\n", sess->userlist_reply, len);
			    
			    if (!(tmp = realloc(sess->userlist_reply, len + h->length))) {
				    gg_debug(GG_DEBUG_MISC, "// gg_watch_fd_connected() not enough memory for userlist reply\n");
				    free(sess->userlist_reply);
				    sess->userlist_reply = NULL;
				    goto fail;
			    }

			    sess->userlist_reply = tmp;
			    sess->userlist_reply[len + h->length - 1] = 0;
			    memcpy(sess->userlist_reply + len, p + 1, h->length - 1);
		    }

		    if (p[0] == GG_USERLIST_GET_MORE_REPLY)
			    break;

		    e->type = GG_EVENT_USERLIST;
		    e->event.userlist.type = p[0];
		    e->event.userlist.reply = sess->userlist_reply;
		    sess->userlist_reply = NULL;

		    break;
		}

	    default:
		gg_debug(GG_DEBUG_MISC, "// gg_watch_fd_connected() received unknown packet 0x%.2x\n", h->type);
	}

	free(h);

	return 0;
	
fail:
	free(h);
	return -1;
}

/*
 * gg_watch_fd()
 *
 * funkcja wywoływana, gdy coś się stanie na obserwowanym deskryptorze.
 * zwraca klientowi informację o tym, co się dzieje.
 *
 *  - sess - identyfikator sesji.
 *
 * zwraca wskaźnik do struktury gg_event, którą trzeba zwolnić później
 * za pomocą gg_free_event(). jesli rodzaj zdarzenia jest równy
 * GG_EVENT_NONE, należy je olać kompletnie. jeśli zwróciło NULL,
 * stało się coś niedobrego -- albo brakło pamięci albo zerwało
 * połączenie albo coś takiego.
 */
struct gg_event *gg_watch_fd(struct gg_session *sess)
{
	struct gg_event *e;
	int res = 0;
#ifndef _WIN32
	int port;
#endif

	if (!sess) {
		errno = EFAULT;
		return NULL;
	}

	gg_debug(GG_DEBUG_FUNCTION, "** gg_watch_fd(...);\n");

	if (!(e = (void*) malloc(sizeof(*e)))) {
		gg_debug(GG_DEBUG_MISC, "-- not enough memory\n");
		return NULL;
	}

	e->type = GG_EVENT_NONE;

	switch (sess->state) {
#ifndef _WIN32
		/* Apparantly we will never be in this state as long as we are
		   using gaim_proxy_connect instead of gg_login - Herman */
		case GG_STATE_RESOLVING:
		{
			struct in_addr a;

			gg_debug(GG_DEBUG_MISC, "== GG_STATE_RESOLVING\n");

			if (read(sess->fd, &a, sizeof(a)) < sizeof(a) || a.s_addr == INADDR_NONE) {
				gg_debug(GG_DEBUG_MISC, "-- resolving failed\n");				

				errno = ENOENT;
				e->type = GG_EVENT_CONN_FAILED;
				e->event.failure = GG_FAILURE_RESOLVING;
				sess->state = GG_STATE_IDLE;

				close(sess->fd);

				break;
			}
			
			sess->server_ip = a.s_addr;

			close(sess->fd);

			waitpid(sess->pid, NULL, 0);

			gg_debug(GG_DEBUG_MISC, "-- resolved, now connecting\n");
			
			if (gg_http_use_proxy) {
				port = gg_http_proxy_port;
			} else {
				port = GG_APPMSG_PORT;
			};

			if ((sess->fd = gg_connect(&a, port, sess->async)) == -1) {
				struct in_addr *addr = (struct in_addr*) &sess->server_ip;
				
				gg_debug(GG_DEBUG_MISC, "-- connection failed, trying direct connection\n");

				if ((sess->fd = gg_connect(addr, GG_DEFAULT_PORT, sess->async)) == -1) {
				    gg_debug(GG_DEBUG_MISC, "-- connection failed, trying https connection\n");
				    if ((sess->fd = gg_connect(&a, GG_HTTPS_PORT, sess->async)) == -1) {		
					gg_debug(GG_DEBUG_MISC, "-- connect() failed. errno = %d (%s)\n", errno, strerror(errno));

					e->type = GG_EVENT_CONN_FAILED;
					e->event.failure = GG_FAILURE_CONNECTING;
					sess->state = GG_STATE_IDLE;
					break;
				    }
				}
				sess->state = GG_STATE_CONNECTING_GG;
				sess->check = GG_CHECK_WRITE;
			} else {
				sess->state = GG_STATE_CONNECTING;
				sess->check = GG_CHECK_WRITE;
			}
				
			break;
		}
#endif /* !_WIN32 */
		case GG_STATE_CONNECTING:
		{
			char buf[1024];
			unsigned int res, res_size = sizeof(res);

			gg_debug(GG_DEBUG_MISC, "== GG_STATE_CONNECTING\n");

			if (sess->async && (getsockopt(sess->fd, SOL_SOCKET, SO_ERROR, &res, &res_size) || res)) {
#if 0
				struct in_addr *addr = (struct in_addr*) &sess->server_ip;
				gg_debug(GG_DEBUG_MISC, "-- http connection failed, errno = %d (%s), trying direct connection\n", res, strerror(res));
				if ((sess->fd = gg_connect(addr, GG_DEFAULT_PORT, sess->async)) == -1) {
				    gg_debug(GG_DEBUG_MISC, "-- connection failed, trying https connection\n");
				    if ((sess->fd = gg_connect(addr, GG_HTTPS_PORT, sess->async)) == -1) {
					gg_debug(GG_DEBUG_MISC, "-- connect() failed. errno = %d (%s)\n", errno, strerror(errno));

					e->type = GG_EVENT_CONN_FAILED;
					e->event.failure = GG_FAILURE_CONNECTING;
					sess->state = GG_STATE_IDLE;
					break;
				    }
				}

				sess->state = GG_STATE_CONNECTING_GG;
				sess->check = GG_CHECK_WRITE;
#else
				gg_debug(GG_DEBUG_MISC, "-- http connection failed, errno = %d\n", res);
				e->type = GG_EVENT_CONN_FAILED;
				e->event.failure = GG_FAILURE_CONNECTING;
				sess->state = GG_STATE_IDLE;
#endif
				break;
			}
			
			gg_debug(GG_DEBUG_MISC, "-- http connection succeded, sending query\n");

			if (gg_http_use_proxy) {
				g_snprintf(buf, sizeof(buf) - 1,
					"GET http://" GG_APPMSG_HOST "/appsvc/appmsg.asp?fmnumber=%lu HTTP/1.0\r\n"
					"Host: " GG_APPMSG_HOST "\r\n"
					"User-Agent: " GG_HTTP_USERAGENT "\r\n"
					"Pragma: no-cache\r\n"
					"\r\n", sess->uin);
			} else {
				g_snprintf(buf, sizeof(buf) - 1,
					"GET /appsvc/appmsg.asp?fmnumber=%lu HTTP/1.0\r\n"
					"Host: " GG_APPMSG_HOST "\r\n"
					"User-Agent: " GG_HTTP_USERAGENT "\r\n"
					"Pragma: no-cache\r\n"
					"\r\n", sess->uin);
			};

    			gg_debug(GG_DEBUG_MISC, "=> -----BEGIN-HTTP-QUERY-----\n%s\n=> -----END-HTTP-QUERY-----\n", buf);
			if (write(sess->fd, buf, strlen(buf)) < strlen(buf)) {
				gg_debug(GG_DEBUG_MISC, "-- sending query failed\n");
				errno = EIO;
				e->type = GG_EVENT_CONN_FAILED;
				e->event.failure = GG_FAILURE_WRITING;
				sess->state = GG_STATE_IDLE;
				break;
			}

			sess->state = GG_STATE_READING_DATA;
			sess->check = GG_CHECK_READ;

			break;
		}

		case GG_STATE_READING_DATA:
		{
			char buf[1024], *tmp, *host;
			int port = GG_DEFAULT_PORT;
			struct in_addr a;

			gg_debug(GG_DEBUG_MISC, "== GG_STATE_READING_DATA\n");

			gg_read_line(sess->fd, buf, sizeof(buf) - 1);
			gg_chomp(buf);
	
			gg_debug(GG_DEBUG_TRAFFIC, "-- got http response (%s)\n", buf);
			if (strncmp(buf, "HTTP/1.", 7) || strncmp(buf + 9, "200", 3)) {
				gg_debug(GG_DEBUG_MISC, "-- but that's not what we've expected\n");

				errno = EINVAL;
				e->type = GG_EVENT_CONN_FAILED;
				e->event.failure = GG_FAILURE_INVALID;
				sess->state = GG_STATE_IDLE;
				break;
			}
	
			while (strcmp(buf, "\r\n") && strcmp(buf, ""))
				gg_read_line(sess->fd, buf, sizeof(buf) - 1);

			gg_read_line(sess->fd, buf, sizeof(buf) - 1);
			gg_chomp(buf);
	
			close(sess->fd);
	
			gg_debug(GG_DEBUG_TRAFFIC, "-- received http data (%s)\n", buf);
						
			/* analizujemy otrzymane dane. */
			tmp = buf;
			
			while (*tmp && *tmp != ' ')
				tmp++;
			while (*tmp && *tmp == ' ')
				tmp++;
			while (*tmp && *tmp != ' ')
				tmp++;
			while (*tmp && *tmp == ' ')
				tmp++;
			while (*tmp && *tmp != ' ')
				tmp++;
			while (*tmp && *tmp == ' ')
				tmp++;
			host = tmp;
			while (*tmp && *tmp != ' ')
				tmp++;
			*tmp = 0;

			if ((tmp = strchr(host, ':'))) {
				*tmp = 0;
				port = atoi(tmp+1);
			}

			a.s_addr = inet_addr(host);
			sess->server_ip = a.s_addr;

#if 0
			/* We need to watch this non-blocking socket so lets use gaim_proxy_connect 
			   in gg.c - Herman */
			if((sess->fd = gg_connect(&a, port, sess->assync)) == -1) {
				gg_debug(GG_DEBUG_MISC, "-- connection failed, trying https connection\n");
				if ((sess->fd = gg_connect(&a, GG_HTTPS_PORT, sess->async)) == -1) {
				    gg_debug(GG_DEBUG_MISC, "-- connection failed, errno = %d (%s)\n", errno, strerror(errno));

				    e->type = GG_EVENT_CONN_FAILED;
				    e->event.failure = GG_FAILURE_CONNECTING;
				    sess->state = GG_STATE_IDLE;
				    break;
				}
			}
#else
			sess->port = port;
#endif
			sess->state = GG_STATE_CONNECTING_GG;
			sess->check = GG_CHECK_WRITE;
		
			break;
		}

		case GG_STATE_CONNECTING_GG:
		{
			unsigned int res, res_size = sizeof(res);

			gg_debug(GG_DEBUG_MISC, "== GG_STATE_CONNECTING_GG\n");

			if (sess->async && (getsockopt(sess->fd, SOL_SOCKET, SO_ERROR, &res, &res_size) || res)) {
				struct in_addr *addr = (struct in_addr*) &sess->server_ip;

				gg_debug(GG_DEBUG_MISC, "-- connection failed, trying https connection\n");
				if ((sess->fd = gg_connect(addr, GG_HTTPS_PORT, sess->async)) == -1) {
				    gg_debug(GG_DEBUG_MISC, "-- connection failed, errno = %d (%s)\n", errno, strerror(errno));
				    
				    e->type = GG_EVENT_CONN_FAILED;
				    e->event.failure = GG_FAILURE_CONNECTING;
				    sess->state = GG_STATE_IDLE;
				    break;
				}
			}

			gg_debug(GG_DEBUG_MISC, "-- connected\n");
			
			sess->state = GG_STATE_READING_KEY;
			sess->check = GG_CHECK_READ;

			break;
		}

		case GG_STATE_READING_KEY:
		{
			struct gg_header *h;			
			struct gg_welcome *w;
			struct gg_login60 l;
			unsigned int hash;
			char *password = sess->password;

			gg_debug(GG_DEBUG_MISC, "== GG_STATE_READING_KEY\n");

			if (!(h = gg_recv_packet(sess))) {
				gg_debug(GG_DEBUG_MISC, "-- gg_recv_packet() failed. errno = %d (%s)\n", errno, strerror(errno));
				e->type = GG_EVENT_CONN_FAILED;
				e->event.failure = GG_FAILURE_READING;
				sess->state = GG_STATE_IDLE;
				close(sess->fd);
				break;
			}
	
			if (h->type != GG_WELCOME) {
				gg_debug(GG_DEBUG_MISC, "-- invalid packet received\n");

				free(h);
				close(sess->fd);
				errno = EINVAL;
				e->type = GG_EVENT_CONN_FAILED;
				e->event.failure = GG_FAILURE_INVALID;
				sess->state = GG_STATE_IDLE;
				break;
			}
	
			w = (struct gg_welcome *)((void *)h + sizeof(struct gg_header));
			w->key = fix32(w->key);
			
			hash = gg_login_hash(password, w->key);
	
			gg_debug(GG_DEBUG_DUMP, "%%%% klucz serwera %.4x, hash hasła %.8x\n", w->key, hash);
	
			free(h);

			free(sess->password);
			sess->password = NULL;
	
			l.uin = fix32(sess->uin);
			l.hash = fix32(hash);
			l.status = fix32(sess->initial_status ? sess->initial_status : GG_STATUS_AVAIL);
			l.version = fix32(0x20);
			l.local_ip = 0;
			l.local_port = 0;
	
			gg_debug(GG_DEBUG_TRAFFIC, "-- sending GG_LOGIN packet\n");

			if (gg_send_packet(sess, GG_LOGIN60, &l, sizeof(l), NULL, 0) == -1) {
				gg_debug(GG_DEBUG_TRAFFIC, "-- oops, failed. errno = %d (%s)\n", errno, strerror(errno));

				close(sess->fd);
				e->type = GG_EVENT_CONN_FAILED;
				e->event.failure = GG_FAILURE_WRITING;
				sess->state = GG_STATE_IDLE;
				break;
			}
	
			sess->state = GG_STATE_READING_REPLY;

			break;
		}

		case GG_STATE_READING_REPLY:
		{
			struct gg_header *h;

			gg_debug(GG_DEBUG_MISC, "== GG_STATE_READING_REPLY\n");

			if (!(h = gg_recv_packet(sess))) {
				gg_debug(GG_DEBUG_MISC, "-- recv_packet failed\n");
				e->type = GG_EVENT_CONN_FAILED;
				e->event.failure = GG_FAILURE_READING;
				sess->state = GG_STATE_IDLE;
				close(sess->fd);
				break;
			}
	
			if (h->type == GG_LOGIN_OK) {
				gg_debug(GG_DEBUG_MISC, "-- login succeded\n");
				e->type = GG_EVENT_CONN_SUCCESS;
				sess->state = GG_STATE_CONNECTED;
				free(h);
				break;
			}

			if (h->type == GG_LOGIN_FAILED) {
				gg_debug(GG_DEBUG_MISC, "-- login failed\n");
				e->event.failure = GG_FAILURE_PASSWORD;
				errno = EACCES;
			} else {
				gg_debug(GG_DEBUG_MISC, "-- invalid packet\n");
				e->event.failure = GG_FAILURE_INVALID;
				errno = EINVAL;
			}

			e->type = GG_EVENT_CONN_FAILED;
			sess->state = GG_STATE_IDLE;
			close(sess->fd);
			free(h);

			break;
		}

		case GG_STATE_CONNECTED:
		{
			gg_debug(GG_DEBUG_MISC, "== GG_STATE_CONNECTED\n");

			if ((res = gg_watch_fd_connected(sess, e)) == -1) {

				gg_debug(GG_DEBUG_MISC, "-- watch_fd_connected failed. errno = %d (%s)\n", errno, strerror(errno));

 				if (errno == EAGAIN) {
					e->type = GG_EVENT_NONE;
					res = 0;
				} else
					res = -1;
			}
			break;
		}
	}

	if (res == -1) {
		free(e);
		e = NULL;
	}

	return e;
}

/*
 * Local variables:
 * c-indentation-style: k&r
 * c-basic-offset: 8
 * indent-tabs-mode: notnil
 * End:
 *
 * vim: shiftwidth=8:
 */