fix indent (broken in last commit)
[claws.git] / src / common / session.c
index 1af16340db33ba5651a62aa78d86b773129b74b6..959c7a28e6785e6956dd765c893df4476fe371ad 100644 (file)
@@ -1,10 +1,10 @@
 /*
  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
- * Copyright (C) 1999-2002 Hiroyuki Yamamoto
+ * Copyright (C) 1999-2012 Hiroyuki Yamamoto and the Claws Mail team
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
+ * the Free Software Foundation; either version 3 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ * 
  */
 
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#include "claws-features.h"
+#endif
+
+#include "defs.h"
+
 #include <glib.h>
+#include <glib/gi18n.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <time.h>
+#include <errno.h>
 
 #include "session.h"
+#include "utils.h"
+#include "log.h"
+
+static gint session_connect_cb         (SockInfo       *sock,
+                                        gpointer        data);
+static gint session_close              (Session        *session);
+
+static gboolean session_timeout_cb     (gpointer        data);
+
+static gboolean session_recv_msg_idle_cb       (gpointer        data);
+static gboolean session_recv_data_idle_cb      (gpointer        data);
+
+static gboolean session_read_msg_cb    (SockInfo       *source,
+                                        GIOCondition    condition,
+                                        gpointer        data);
+static gboolean session_read_data_cb   (SockInfo       *source,
+                                        GIOCondition    condition,
+                                        gpointer        data);
+static gboolean session_write_msg_cb   (SockInfo       *source,
+                                        GIOCondition    condition,
+                                        gpointer        data);
+static gboolean session_write_data_cb  (SockInfo       *source,
+                                        GIOCondition    condition,
+                                        gpointer        data);
+
+
+void session_init(Session *session, const void *prefs_account, gboolean is_smtp)
+{
+       session->type = SESSION_UNKNOWN;
+       session->sock = NULL;
+       session->server = NULL;
+       session->port = 0;
+#ifdef USE_GNUTLS
+       session->ssl_type = SSL_NONE;
+#endif
+       session->nonblocking = TRUE;
+       session->state = SESSION_READY;
+       session->last_access_time = time(NULL);
+
+       g_get_current_time(&session->tv_prev);
+
+       session->conn_id = 0;
+
+       session->io_tag = 0;
+
+       session->read_buf_p = session->read_buf;
+       session->read_buf_len = 0;
+
+       session->read_msg_buf = g_string_sized_new(1024);
+       session->read_data_buf = g_byte_array_new();
+
+       session->write_buf = NULL;
+       session->write_buf_p = NULL;
+       session->write_buf_len = 0;
+
+       session->write_data = NULL;
+       session->write_data_p = NULL;
+       session->write_data_len = 0;
+
+       session->timeout_tag = 0;
+       session->timeout_interval = 0;
+
+       session->data = NULL;
+       session->account = prefs_account;
+       session->is_smtp = is_smtp;
+
+       session->ping_tag = -1;
+}
+
+/*!
+ *\brief       Set up parent and child process
+ *             Childloop: Read commands from parent,
+ *             send to server, get answer, pass to parent
+ *
+ *\param       session Contains session information
+ *             server to connect to
+ *             port to connect to
+ *
+ *\return       0 : success
+ *             -1 : pipe / fork errors (parent)
+ *              1 : connection error (child)
+ */
+gint session_connect(Session *session, const gchar *server, gushort port)
+{
+#ifdef G_OS_UNIX
+       session->server = g_strdup(server);
+       session->port = port;
+
+       session->conn_id = sock_connect_async(server, port, session_connect_cb,
+                                             session);
+       if (session->conn_id < 0) {
+               g_warning("can't connect to server.");
+               session_close(session);
+               return -1;
+       }
+
+       return 0;
+#else
+       SockInfo *sock;
+
+       session->server = g_strdup(server);
+       session->port = port;
+
+       sock = sock_connect(server, port);
+       if (sock == NULL) {
+               g_warning("can't connect to server.");
+               session_close(session);
+               return -1;
+       }
+       sock->is_smtp = session->is_smtp;
+
+       return session_connect_cb(sock, session);
+#endif
+}
+
+static gint session_connect_cb(SockInfo *sock, gpointer data)
+{
+       Session *session = SESSION(data);
+
+       session->conn_id = 0;
+
+       if (!sock) {
+               g_warning("can't connect to server.");
+               session->state = SESSION_ERROR;
+               return -1;
+       }
+
+       session->sock = sock;
+       sock->account = session->account;
+       sock->is_smtp = session->is_smtp;
+       sock->ssl_cert_auto_accept = session->ssl_cert_auto_accept;
+
+#ifdef USE_GNUTLS
+       sock->gnutls_priority = session->gnutls_priority;
+
+       if (session->ssl_type == SSL_TUNNEL) {
+               sock_set_nonblocking_mode(sock, FALSE);
+               if (!ssl_init_socket(sock)) {
+                       g_warning("can't initialize SSL.");
+                       log_error(LOG_PROTOCOL, _("SSL handshake failed\n"));
+                       session->state = SESSION_ERROR;
+                       return -1;
+               }
+       }
+#endif
 
+       /* we could have gotten a timeout while waiting for user input in 
+        * an SSL certificate dialog */
+       if (session->state == SESSION_TIMEOUT)
+               return -1;
+
+       sock_set_nonblocking_mode(sock, session->nonblocking);
+
+       debug_print("session (%p): connected\n", session);
+
+       session->state = SESSION_RECV;
+       session->io_tag = sock_add_watch(session->sock, G_IO_IN,
+                                        session_read_msg_cb,
+                                        session);
+
+       return 0;
+}
+
+/*!
+ *\brief       child and parent: send DISCONNECT message to other process
+ *
+ *\param       session Contains session information
+ *
+ *\return       0 : success
+ */
+gint session_disconnect(Session *session)
+{
+       session_close(session);
+       return 0;
+}
+
+/*!
+ *\brief       parent ?
+ *
+ *\param       session Contains session information
+ */
 void session_destroy(Session *session)
 {
-       g_return_if_fail(session != NULL);
-       g_return_if_fail(session->destroy != NULL);
+       cm_return_if_fail(session != NULL);
+       cm_return_if_fail(session->destroy != NULL);
 
+       session_register_ping(session, NULL);
+
+       session_close(session);
        session->destroy(session);
        g_free(session->server);
+       g_string_free(session->read_msg_buf, TRUE);
+       g_byte_array_free(session->read_data_buf, TRUE);
+       g_free(session->read_data_terminator);
+       g_free(session->write_buf);
+#ifdef USE_GNUTLS
+       g_free(session->gnutls_priority);
+#endif
+
+       debug_print("session (%p): destroyed\n", session);
+
        g_free(session);
 }
+
+gboolean session_is_running(Session *session)
+{
+       return (session->state == SESSION_READY ||
+               session->state == SESSION_SEND ||
+               session->state == SESSION_RECV);
+}
+
+gboolean session_is_connected(Session *session)
+{
+       return (session->state == SESSION_SEND ||
+               session->state == SESSION_RECV);
+}
+
+void session_set_access_time(Session *session)
+{
+       session->last_access_time = time(NULL);
+}
+
+void session_set_timeout(Session *session, guint interval)
+{
+       if (session->timeout_tag > 0)
+               g_source_remove(session->timeout_tag);
+
+       session->timeout_interval = interval;
+       if (interval > 0) {
+               if (interval % 1000 == 0)
+                       session->timeout_tag =
+                               g_timeout_add_seconds(interval/1000, session_timeout_cb, session);
+               else
+                       session->timeout_tag =
+                               g_timeout_add(interval, session_timeout_cb, session);
+       } else
+               session->timeout_tag = 0;
+}
+
+static gboolean session_timeout_cb(gpointer data)
+{
+       Session *session = SESSION(data);
+
+       g_warning("session timeout.\n");
+
+       if (session->io_tag > 0) {
+               g_source_remove(session->io_tag);
+               session->io_tag = 0;
+       }
+
+       session->timeout_tag = 0;
+       session->state = SESSION_TIMEOUT;
+
+       return FALSE;
+}
+
+void session_set_recv_message_notify(Session *session,
+                                    RecvMsgNotify notify_func, gpointer data)
+{
+       session->recv_msg_notify = notify_func;
+       session->recv_msg_notify_data = data;
+}
+
+void session_set_recv_data_progressive_notify
+                                       (Session *session,
+                                        RecvDataProgressiveNotify notify_func,
+                                        gpointer data)
+{
+       session->recv_data_progressive_notify = notify_func,
+       session->recv_data_progressive_notify_data = data;
+}
+
+void session_set_recv_data_notify(Session *session, RecvDataNotify notify_func,
+                                 gpointer data)
+{
+       session->recv_data_notify = notify_func;
+       session->recv_data_notify_data = data;
+}
+
+void session_set_send_data_progressive_notify
+                                       (Session *session,
+                                        SendDataProgressiveNotify notify_func,
+                                        gpointer data)
+{
+       session->send_data_progressive_notify = notify_func;
+       session->send_data_progressive_notify_data = data;
+}
+
+void session_set_send_data_notify(Session *session, SendDataNotify notify_func,
+                                 gpointer data)
+{
+       session->send_data_notify = notify_func;
+       session->send_data_notify_data = data;
+}
+
+/*!
+ *\brief       child and parent cleanup (child closes first)
+ *
+ *\param       session Contains session information
+ *
+ *\return       0 : success
+ */
+static gint session_close(Session *session)
+{
+       cm_return_val_if_fail(session != NULL, -1);
+
+#ifdef G_OS_UNIX
+       if (session->conn_id > 0) {
+               sock_connect_async_cancel(session->conn_id);
+               session->conn_id = 0;
+               debug_print("session (%p): connection cancelled\n", session);
+       }
+#endif
+
+       session_set_timeout(session, 0);
+
+       if (session->io_tag > 0) {
+               g_source_remove(session->io_tag);
+               session->io_tag = 0;
+       }
+
+       if (session->sock) {
+               sock_close(session->sock);
+               session->sock = NULL;
+               session->state = SESSION_DISCONNECTED;
+               debug_print("session (%p): closed\n", session);
+       }
+
+       return 0;
+}
+
+#ifdef USE_GNUTLS
+gint session_start_tls(Session *session)
+{
+       gboolean nb_mode;
+
+       nb_mode = sock_is_nonblocking_mode(session->sock);
+
+       session->sock->ssl_cert_auto_accept = session->ssl_cert_auto_accept;
+
+       if (nb_mode)
+               sock_set_nonblocking_mode(session->sock, FALSE);
+
+       if (!ssl_init_socket_with_method(session->sock, SSL_METHOD_TLSv1)) {
+               g_warning("couldn't start TLS session.\n");
+               if (nb_mode)
+                       sock_set_nonblocking_mode(session->sock, session->nonblocking);
+               return -1;
+       }
+
+       if (nb_mode)
+               sock_set_nonblocking_mode(session->sock, session->nonblocking);
+
+       return 0;
+}
+#endif
+
+gint session_send_msg(Session *session, SessionMsgType type, const gchar *msg)
+{
+       gboolean ret;
+
+       cm_return_val_if_fail(session->write_buf == NULL, -1);
+       cm_return_val_if_fail(msg != NULL, -1);
+       cm_return_val_if_fail(msg[0] != '\0', -1);
+
+       session->state = SESSION_SEND;
+       session->write_buf = g_strconcat(msg, "\r\n", NULL);
+       session->write_buf_p = session->write_buf;
+       session->write_buf_len = strlen(msg) + 2;
+
+       ret = session_write_msg_cb(session->sock, G_IO_OUT, session);
+
+       if (ret == TRUE)
+               session->io_tag = sock_add_watch(session->sock, G_IO_OUT,
+                                                session_write_msg_cb, session);
+       else if (session->state == SESSION_ERROR)
+               return -1;
+
+       return 0;
+}
+
+gint session_recv_msg(Session *session)
+{
+       cm_return_val_if_fail(session->read_msg_buf->len == 0, -1);
+
+       session->state = SESSION_RECV;
+
+       if (session->read_buf_len > 0)
+               g_idle_add(session_recv_msg_idle_cb, session);
+       else
+               session->io_tag = sock_add_watch(session->sock, G_IO_IN,
+                                                session_read_msg_cb, session);
+
+       return 0;
+}
+
+static gboolean session_recv_msg_idle_cb(gpointer data)
+{
+       Session *session = SESSION(data);
+       gboolean ret;
+
+       ret = session_read_msg_cb(session->sock, G_IO_IN, session);
+
+       if (ret == TRUE)
+               session->io_tag = sock_add_watch(session->sock, G_IO_IN,
+                                                session_read_msg_cb, session);
+
+       return FALSE;
+}
+
+/*!
+ *\brief       parent (child?): send data to other process
+ *
+ *\param       session Contains session information
+ *             data Data to send
+ *             size Bytes to send
+ *
+ *\return       0 : success
+ *             -1 : error
+ */
+gint session_send_data(Session *session, const guchar *data, guint size)
+{
+       gboolean ret;
+
+       cm_return_val_if_fail(session->write_data == NULL, -1);
+       cm_return_val_if_fail(data != NULL, -1);
+       cm_return_val_if_fail(size != 0, -1);
+
+       session->state = SESSION_SEND;
+
+       session->write_data = data;
+       session->write_data_p = session->write_data;
+       session->write_data_len = size;
+       g_get_current_time(&session->tv_prev);
+
+       ret = session_write_data_cb(session->sock, G_IO_OUT, session);
+
+       if (ret == TRUE)
+               session->io_tag = sock_add_watch(session->sock, G_IO_OUT,
+                                                session_write_data_cb,
+                                                session);
+       else if (session->state == SESSION_ERROR)
+               return -1;
+
+       return 0;
+}
+
+gint session_recv_data(Session *session, guint size, const gchar *terminator)
+{
+       cm_return_val_if_fail(session->read_data_buf->len == 0, -1);
+
+       session->state = SESSION_RECV;
+
+       g_free(session->read_data_terminator);
+       session->read_data_terminator = g_strdup(terminator);
+       g_get_current_time(&session->tv_prev);
+
+       if (session->read_buf_len > 0)
+               g_idle_add(session_recv_data_idle_cb, session);
+       else
+               session->io_tag = sock_add_watch(session->sock, G_IO_IN,
+                                                session_read_data_cb, session);
+
+       return 0;
+}
+
+static gboolean session_recv_data_idle_cb(gpointer data)
+{
+       Session *session = SESSION(data);
+       gboolean ret;
+
+       ret = session_read_data_cb(session->sock, G_IO_IN, session);
+
+       if (ret == TRUE)
+               session->io_tag = sock_add_watch(session->sock, G_IO_IN,
+                                                session_read_data_cb, session);
+
+       return FALSE;
+}
+
+static gboolean session_read_msg_cb(SockInfo *source, GIOCondition condition,
+                                   gpointer data)
+{
+       Session *session = SESSION(data);
+       gchar buf[SESSION_BUFFSIZE];
+       gint line_len;
+       gchar *newline;
+       gchar *msg;
+       gint ret;
+
+       cm_return_val_if_fail(condition == G_IO_IN, FALSE);
+
+       session_set_timeout(session, session->timeout_interval);
+
+       if (session->read_buf_len == 0) {
+               gint read_len = -1;
+
+               if (session->sock)
+                       read_len = sock_read(session->sock, session->read_buf,
+                                    SESSION_BUFFSIZE - 1);
+
+               if (read_len == -1 && session->state == SESSION_DISCONNECTED) {
+                       g_warning ("sock_read: session disconnected\n");
+                       if (session->io_tag > 0) {
+                               g_source_remove(session->io_tag);
+                               session->io_tag = 0;
+                       }
+                       return FALSE;
+               }
+               
+               if (read_len == 0) {
+                       g_warning("sock_read: received EOF\n");
+                       session->state = SESSION_EOF;
+                       return FALSE;
+               }
+
+               if (read_len < 0) {
+                       switch (errno) {
+                       case EAGAIN:
+                               return TRUE;
+                       default:
+                               g_warning("sock_read: %s\n", g_strerror(errno));
+                               session->state = SESSION_ERROR;
+                               return FALSE;
+                       }
+               }
+
+               session->read_buf_len = read_len;
+       }
+
+       if ((newline = memchr(session->read_buf_p, '\n', session->read_buf_len))
+               != NULL)
+               line_len = newline - session->read_buf_p + 1;
+       else
+               line_len = session->read_buf_len;
+
+       if (line_len == 0)
+               return TRUE;
+
+       memcpy(buf, session->read_buf_p, line_len);
+       buf[line_len] = '\0';
+
+       g_string_append(session->read_msg_buf, buf);
+
+       session->read_buf_len -= line_len;
+       if (session->read_buf_len == 0)
+               session->read_buf_p = session->read_buf;
+       else
+               session->read_buf_p += line_len;
+
+       /* incomplete read */
+       if (buf[line_len - 1] != '\n')
+               return TRUE;
+
+       /* complete */
+       if (session->io_tag > 0) {
+               g_source_remove(session->io_tag);
+               session->io_tag = 0;
+       }
+
+       /* callback */
+       msg = g_strdup(session->read_msg_buf->str);
+       strretchomp(msg);
+       g_string_truncate(session->read_msg_buf, 0);
+
+       ret = session->recv_msg(session, msg);
+       session->recv_msg_notify(session, msg, session->recv_msg_notify_data);
+
+       g_free(msg);
+
+       if (ret < 0)
+               session->state = SESSION_ERROR;
+
+       return FALSE;
+}
+
+static gboolean session_read_data_cb(SockInfo *source, GIOCondition condition,
+                                    gpointer data)
+{
+       Session *session = SESSION(data);
+       GByteArray *data_buf;
+       gint terminator_len;
+       gboolean complete = FALSE;
+       guint data_len;
+       gint ret;
+
+       cm_return_val_if_fail(condition == G_IO_IN, FALSE);
+
+       session_set_timeout(session, session->timeout_interval);
+
+       if (session->read_buf_len == 0) {
+               gint read_len;
+
+               read_len = sock_read(session->sock, session->read_buf,
+                                    SESSION_BUFFSIZE);
+
+               if (read_len == 0) {
+                       g_warning("sock_read: received EOF\n");
+                       session->state = SESSION_EOF;
+                       return FALSE;
+               }
+
+               if (read_len < 0) {
+                       switch (errno) {
+                       case EAGAIN:
+                               return TRUE;
+                       default:
+                               g_warning("sock_read: %s\n", g_strerror(errno));
+                               session->state = SESSION_ERROR;
+                               return FALSE;
+                       }
+               }
+
+               session->read_buf_len = read_len;
+       }
+
+       data_buf = session->read_data_buf;
+       terminator_len = strlen(session->read_data_terminator);
+
+       if (session->read_buf_len == 0)
+               return TRUE;
+
+       g_byte_array_append(data_buf, session->read_buf_p,
+                           session->read_buf_len);
+
+       session->read_buf_len = 0;
+       session->read_buf_p = session->read_buf;
+
+       /* check if data is terminated */
+       if (data_buf->len >= terminator_len) {
+               if (memcmp(data_buf->data, session->read_data_terminator,
+                          terminator_len) == 0)
+                       complete = TRUE;
+               else if (data_buf->len >= terminator_len + 2 &&
+                        memcmp(data_buf->data + data_buf->len -
+                               (terminator_len + 2), "\r\n", 2) == 0 &&
+                        memcmp(data_buf->data + data_buf->len -
+                               terminator_len, session->read_data_terminator,
+                               terminator_len) == 0)
+                       complete = TRUE;
+       }
+
+       /* incomplete read */
+       if (!complete) {
+               GTimeVal tv_cur;
+
+               g_get_current_time(&tv_cur);
+               if (tv_cur.tv_sec - session->tv_prev.tv_sec > 0 ||
+                   tv_cur.tv_usec - session->tv_prev.tv_usec >
+                   UI_REFRESH_INTERVAL) {
+                       session->recv_data_progressive_notify
+                               (session, data_buf->len, 0,
+                                session->recv_data_progressive_notify_data);
+                       g_get_current_time(&session->tv_prev);
+               }
+               return TRUE;
+       }
+
+       /* complete */
+       if (session->io_tag > 0) {
+               g_source_remove(session->io_tag);
+               session->io_tag = 0;
+       }
+
+       data_len = data_buf->len - terminator_len;
+
+       /* callback */
+       ret = session->recv_data_finished(session, (gchar *)data_buf->data,
+                                         data_len);
+
+       g_byte_array_set_size(data_buf, 0);
+
+       session->recv_data_notify(session, data_len,
+                                 session->recv_data_notify_data);
+
+       if (ret < 0)
+               session->state = SESSION_ERROR;
+
+       return FALSE;
+}
+
+static gint session_write_buf(Session *session)
+{
+       gint write_len;
+       gint to_write_len;
+
+       cm_return_val_if_fail(session->write_buf != NULL, -1);
+       cm_return_val_if_fail(session->write_buf_p != NULL, -1);
+       cm_return_val_if_fail(session->write_buf_len > 0, -1);
+
+       to_write_len = session->write_buf_len -
+               (session->write_buf_p - session->write_buf);
+       to_write_len = MIN(to_write_len, SESSION_BUFFSIZE);
+
+       write_len = sock_write(session->sock, session->write_buf_p,
+                              to_write_len);
+
+       if (write_len < 0) {
+               switch (errno) {
+               case EAGAIN:
+                       write_len = 0;
+                       break;
+               default:
+                       g_warning("sock_write: %s\n", g_strerror(errno));
+                       session->state = SESSION_ERROR;
+                       return -1;
+               }
+       }
+
+       /* incomplete write */
+       if (session->write_buf_p - session->write_buf + write_len <
+           session->write_buf_len) {
+               session->write_buf_p += write_len;
+               return 1;
+       }
+
+       g_free(session->write_buf);
+       session->write_buf = NULL;
+       session->write_buf_p = NULL;
+       session->write_buf_len = 0;
+
+       return 0;
+}
+
+static gint session_write_data(Session *session)
+{
+       gint write_len;
+       gint to_write_len;
+
+       cm_return_val_if_fail(session->write_data != NULL, -1);
+       cm_return_val_if_fail(session->write_data_p != NULL, -1);
+       cm_return_val_if_fail(session->write_data_len > 0, -1);
+
+       to_write_len = session->write_data_len -
+               (session->write_data_p - session->write_data);
+       to_write_len = MIN(to_write_len, SESSION_BUFFSIZE);
+
+       write_len = sock_write(session->sock, session->write_data_p,
+                              to_write_len);
+
+       if (write_len < 0) {
+               switch (errno) {
+               case EAGAIN:
+                       write_len = 0;
+                       break;
+               default:
+                       g_warning("sock_write: %s\n", g_strerror(errno));
+                       session->state = SESSION_ERROR;
+                       return -1;
+               }
+       }
+
+       /* incomplete write */
+       if (session->write_data_p - session->write_data + write_len <
+           session->write_data_len) {
+               session->write_data_p += write_len;
+               return 1;
+       }
+
+       session->write_data = NULL;
+       session->write_data_p = NULL;
+       session->write_data_len = 0;
+
+       return 0;
+}
+
+static gboolean session_write_msg_cb(SockInfo *source, GIOCondition condition,
+                                    gpointer data)
+{
+       Session *session = SESSION(data);
+       gint ret;
+
+       cm_return_val_if_fail(condition == G_IO_OUT, FALSE);
+       cm_return_val_if_fail(session->write_buf != NULL, FALSE);
+       cm_return_val_if_fail(session->write_buf_p != NULL, FALSE);
+       cm_return_val_if_fail(session->write_buf_len > 0, FALSE);
+
+       ret = session_write_buf(session);
+
+       if (ret < 0) {
+               session->state = SESSION_ERROR;
+               return FALSE;
+       } else if (ret > 0)
+               return TRUE;
+
+       if (session->io_tag > 0) {
+               g_source_remove(session->io_tag);
+               session->io_tag = 0;
+       }
+
+       session_recv_msg(session);
+
+       return FALSE;
+}
+
+static gboolean session_write_data_cb(SockInfo *source,
+                                     GIOCondition condition, gpointer data)
+{
+       Session *session = SESSION(data);
+       guint write_data_len;
+       gint ret;
+
+       cm_return_val_if_fail(condition == G_IO_OUT, FALSE);
+       cm_return_val_if_fail(session->write_data != NULL, FALSE);
+       cm_return_val_if_fail(session->write_data_p != NULL, FALSE);
+       cm_return_val_if_fail(session->write_data_len > 0, FALSE);
+
+       write_data_len = session->write_data_len;
+
+       ret = session_write_data(session);
+
+       if (ret < 0) {
+               session->state = SESSION_ERROR;
+               return FALSE;
+       } else if (ret > 0) {
+               GTimeVal tv_cur;
+
+               g_get_current_time(&tv_cur);
+               if (tv_cur.tv_sec - session->tv_prev.tv_sec > 0 ||
+                   tv_cur.tv_usec - session->tv_prev.tv_usec >
+                   UI_REFRESH_INTERVAL) {
+                       session_set_timeout(session, session->timeout_interval);
+                       session->send_data_progressive_notify
+                               (session,
+                                session->write_data_p - session->write_data,
+                                write_data_len,
+                                session->send_data_progressive_notify_data);
+                       g_get_current_time(&session->tv_prev);
+               }
+               return TRUE;
+       }
+
+       if (session->io_tag > 0) {
+               g_source_remove(session->io_tag);
+               session->io_tag = 0;
+       }
+
+       /* callback */
+       ret = session->send_data_finished(session, write_data_len);
+       session->send_data_notify(session, write_data_len,
+                                 session->send_data_notify_data);
+
+       return FALSE;
+}
+
+void session_register_ping(Session *session, gboolean (*ping_cb)(gpointer data))
+{
+       if (!session)
+               return;
+       if (session->ping_tag > -1)
+               g_source_remove(session->ping_tag);
+
+       session->ping_tag = -1;
+
+       if (ping_cb != NULL)
+               session->ping_tag = g_timeout_add_seconds(60, ping_cb, session);
+}