src/common/session.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2007 Hiroyuki Yamamoto and the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  *
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #endif
  23
  24 #include "defs.h"
  25
  26 #include <glib.h>
  27 #include <glib/gi18n.h>
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33 #include <time.h>
  34 #include <errno.h>
  35
  36 #include "session.h"
  37 #include "utils.h"
  38 #include "log.h"
  39
  40 static gint session_connect_cb          (SockInfo       *sock,
  41                                          gpointer        data);
  42 static gint session_close               (Session        *session);
  43
  44 static gboolean session_timeout_cb      (gpointer        data);
  45
  46 static gboolean session_recv_msg_idle_cb        (gpointer        data);
  47 static gboolean session_recv_data_idle_cb       (gpointer        data);
  48
  49 static gboolean session_read_msg_cb     (SockInfo       *source,
  50                                          GIOCondition    condition,
  51                                          gpointer        data);
  52 static gboolean session_read_data_cb    (SockInfo       *source,
  53                                          GIOCondition    condition,
  54                                          gpointer        data);
  55 static gboolean session_write_msg_cb    (SockInfo       *source,
  56                                          GIOCondition    condition,
  57                                          gpointer        data);
  58 static gboolean session_write_data_cb   (SockInfo       *source,
  59                                          GIOCondition    condition,
  60                                          gpointer        data);
  61
  62
  63 void session_init(Session *session, const void *prefs_account, gboolean is_smtp)
  64 {
  65         session->type = SESSION_UNKNOWN;
  66         session->sock = NULL;
  67         session->server = NULL;
  68         session->port = 0;
  69 #ifdef USE_GNUTLS
  70         session->ssl_type = SSL_NONE;
  71 #endif
  72         session->nonblocking = TRUE;
  73         session->state = SESSION_READY;
  74         session->last_access_time = time(NULL);
  75
  76         g_get_current_time(&session->tv_prev);
  77
  78         session->conn_id = 0;
  79
  80         session->io_tag = 0;
  81
  82         session->read_buf_p = session->read_buf;
  83         session->read_buf_len = 0;
  84
  85         session->read_msg_buf = g_string_sized_new(1024);
  86         session->read_data_buf = g_byte_array_new();
  87
  88         session->write_buf = NULL;
  89         session->write_buf_p = NULL;
  90         session->write_buf_len = 0;
  91
  92         session->write_data = NULL;
  93         session->write_data_p = NULL;
  94         session->write_data_len = 0;
  95
  96         session->timeout_tag = 0;
  97         session->timeout_interval = 0;
  98
  99         session->data = NULL;
 100         session->account = prefs_account;
 101         session->is_smtp = is_smtp;
 102 }
 103
 104 /*!
 105  *\brief        Set up parent and child process
 106  *              Childloop: Read commands from parent,
 107  *              send to server, get answer, pass to parent
 108  *
 109  *\param        session Contains session information
 110  *              server to connect to
 111  *              port to connect to
 112  *
 113  *\return        0 : success
 114  *              -1 : pipe / fork errors (parent)
 115  *               1 : connection error (child)
 116  */
 117 gint session_connect(Session *session, const gchar *server, gushort port)
 118 {
 119 #ifdef G_OS_UNIX
 120         session->server = g_strdup(server);
 121         session->port = port;
 122
 123         session->conn_id = sock_connect_async(server, port, session_connect_cb,
 124                                               session);
 125         if (session->conn_id < 0) {
 126                 g_warning("can't connect to server.");
 127                 session_close(session);
 128                 return -1;
 129         }
 130
 131         return 0;
 132 #else
 133         SockInfo *sock;
 134
 135         session->server = g_strdup(server);
 136         session->port = port;
 137
 138         sock = sock_connect(server, port);
 139         if (sock == NULL) {
 140                 g_warning("can't connect to server.");
 141                 session_close(session);
 142                 return -1;
 143         }
 144         sock->is_smtp = session->is_smtp;
 145
 146         return session_connect_cb(sock, session);
 147 #endif
 148 }
 149
 150 static gint session_connect_cb(SockInfo *sock, gpointer data)
 151 {
 152         Session *session = SESSION(data);
 153
 154         session->conn_id = 0;
 155
 156         if (!sock) {
 157                 g_warning("can't connect to server.");
 158                 session->state = SESSION_ERROR;
 159                 return -1;
 160         }
 161
 162         session->sock = sock;
 163         sock->account = session->account;
 164         sock->is_smtp = session->is_smtp;
 165 #ifdef USE_GNUTLS
 166         if (session->ssl_type == SSL_TUNNEL) {
 167                 sock_set_nonblocking_mode(sock, FALSE);
 168                 if (!ssl_init_socket(sock)) {
 169                         g_warning("can't initialize SSL.");
 170                         log_error(LOG_PROTOCOL, _("SSL handshake failed\n"));
 171                         session->state = SESSION_ERROR;
 172                         return -1;
 173                 }
 174         }
 175 #endif
 176
 177         sock_set_nonblocking_mode(sock, session->nonblocking);
 178
 179         debug_print("session (%p): connected\n", session);
 180
 181         session->state = SESSION_RECV;
 182         session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 183                                          session_read_msg_cb,
 184                                          session);
 185
 186         return 0;
 187 }
 188
 189 /*!
 190  *\brief        child and parent: send DISCONNECT message to other process
 191  *
 192  *\param        session Contains session information
 193  *
 194  *\return        0 : success
 195  */
 196 gint session_disconnect(Session *session)
 197 {
 198         session_close(session);
 199         return 0;
 200 }
 201
 202 /*!
 203  *\brief        parent ?
 204  *
 205  *\param        session Contains session information
 206  */
 207 void session_destroy(Session *session)
 208 {
 209         g_return_if_fail(session != NULL);
 210         g_return_if_fail(session->destroy != NULL);
 211
 212         session_close(session);
 213         session->destroy(session);
 214         g_free(session->server);
 215         g_string_free(session->read_msg_buf, TRUE);
 216         g_byte_array_free(session->read_data_buf, TRUE);
 217         g_free(session->read_data_terminator);
 218         g_free(session->write_buf);
 219
 220         debug_print("session (%p): destroyed\n", session);
 221
 222         g_free(session);
 223 }
 224
 225 gboolean session_is_connected(Session *session)
 226 {
 227         return (session->state == SESSION_READY ||
 228                 session->state == SESSION_SEND ||
 229                 session->state == SESSION_RECV);
 230 }
 231
 232 void session_set_access_time(Session *session)
 233 {
 234         session->last_access_time = time(NULL);
 235 }
 236
 237 void session_set_timeout(Session *session, guint interval)
 238 {
 239         if (session->timeout_tag > 0)
 240                 g_source_remove(session->timeout_tag);
 241
 242         session->timeout_interval = interval;
 243         if (interval > 0) {
 244 #if GLIB_CHECK_VERSION(2,14,0)
 245                 if (interval % 1000 == 0)
 246                         session->timeout_tag =
 247                                 g_timeout_add_seconds(interval/1000, session_timeout_cb, session);
 248                 else
 249 #endif
 250                 session->timeout_tag =
 251                         g_timeout_add(interval, session_timeout_cb, session);
 252         } else
 253                 session->timeout_tag = 0;
 254 }
 255
 256 static gboolean session_timeout_cb(gpointer data)
 257 {
 258         Session *session = SESSION(data);
 259
 260         g_warning("session timeout.\n");
 261
 262         if (session->io_tag > 0) {
 263                 g_source_remove(session->io_tag);
 264                 session->io_tag = 0;
 265         }
 266
 267         session->timeout_tag = 0;
 268         session->state = SESSION_TIMEOUT;
 269
 270         return FALSE;
 271 }
 272
 273 void session_set_recv_message_notify(Session *session,
 274                                      RecvMsgNotify notify_func, gpointer data)
 275 {
 276         session->recv_msg_notify = notify_func;
 277         session->recv_msg_notify_data = data;
 278 }
 279
 280 void session_set_recv_data_progressive_notify
 281                                         (Session *session,
 282                                          RecvDataProgressiveNotify notify_func,
 283                                          gpointer data)
 284 {
 285         session->recv_data_progressive_notify = notify_func,
 286         session->recv_data_progressive_notify_data = data;
 287 }
 288
 289 void session_set_recv_data_notify(Session *session, RecvDataNotify notify_func,
 290                                   gpointer data)
 291 {
 292         session->recv_data_notify = notify_func;
 293         session->recv_data_notify_data = data;
 294 }
 295
 296 void session_set_send_data_progressive_notify
 297                                         (Session *session,
 298                                          SendDataProgressiveNotify notify_func,
 299                                          gpointer data)
 300 {
 301         session->send_data_progressive_notify = notify_func;
 302         session->send_data_progressive_notify_data = data;
 303 }
 304
 305 void session_set_send_data_notify(Session *session, SendDataNotify notify_func,
 306                                   gpointer data)
 307 {
 308         session->send_data_notify = notify_func;
 309         session->send_data_notify_data = data;
 310 }
 311
 312 /*!
 313  *\brief        child and parent cleanup (child closes first)
 314  *
 315  *\param        session Contains session information
 316  *
 317  *\return        0 : success
 318  */
 319 static gint session_close(Session *session)
 320 {
 321         g_return_val_if_fail(session != NULL, -1);
 322
 323 #ifdef G_OS_UNIX
 324         if (session->conn_id > 0) {
 325                 sock_connect_async_cancel(session->conn_id);
 326                 session->conn_id = 0;
 327                 debug_print("session (%p): connection cancelled\n", session);
 328         }
 329 #endif
 330
 331         session_set_timeout(session, 0);
 332
 333         if (session->io_tag > 0) {
 334                 g_source_remove(session->io_tag);
 335                 session->io_tag = 0;
 336         }
 337
 338         if (session->sock) {
 339                 sock_close(session->sock);
 340                 session->sock = NULL;
 341                 session->state = SESSION_DISCONNECTED;
 342                 debug_print("session (%p): closed\n", session);
 343         }
 344
 345         return 0;
 346 }
 347
 348 #ifdef USE_GNUTLS
 349 gint session_start_tls(Session *session)
 350 {
 351         gboolean nb_mode;
 352
 353         nb_mode = sock_is_nonblocking_mode(session->sock);
 354
 355         if (nb_mode)
 356                 sock_set_nonblocking_mode(session->sock, FALSE);
 357
 358         if (!ssl_init_socket_with_method(session->sock, SSL_METHOD_TLSv1)) {
 359                 g_warning("couldn't start TLS session.\n");
 360                 if (nb_mode)
 361                         sock_set_nonblocking_mode(session->sock, session->nonblocking);
 362                 return -1;
 363         }
 364
 365         if (nb_mode)
 366                 sock_set_nonblocking_mode(session->sock, session->nonblocking);
 367
 368         return 0;
 369 }
 370 #endif
 371
 372 gint session_send_msg(Session *session, SessionMsgType type, const gchar *msg)
 373 {
 374         gboolean ret;
 375
 376         g_return_val_if_fail(session->write_buf == NULL, -1);
 377         g_return_val_if_fail(msg != NULL, -1);
 378         g_return_val_if_fail(msg[0] != '\0', -1);
 379
 380         session->state = SESSION_SEND;
 381         session->write_buf = g_strconcat(msg, "\r\n", NULL);
 382         session->write_buf_p = session->write_buf;
 383         session->write_buf_len = strlen(msg) + 2;
 384
 385         ret = session_write_msg_cb(session->sock, G_IO_OUT, session);
 386
 387         if (ret == TRUE)
 388                 session->io_tag = sock_add_watch(session->sock, G_IO_OUT,
 389                                                  session_write_msg_cb, session);
 390         else if (session->state == SESSION_ERROR)
 391                 return -1;
 392
 393         return 0;
 394 }
 395
 396 gint session_recv_msg(Session *session)
 397 {
 398         g_return_val_if_fail(session->read_msg_buf->len == 0, -1);
 399
 400         session->state = SESSION_RECV;
 401
 402         if (session->read_buf_len > 0)
 403                 g_idle_add(session_recv_msg_idle_cb, session);
 404         else
 405                 session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 406                                                  session_read_msg_cb, session);
 407
 408         return 0;
 409 }
 410
 411 static gboolean session_recv_msg_idle_cb(gpointer data)
 412 {
 413         Session *session = SESSION(data);
 414         gboolean ret;
 415
 416         ret = session_read_msg_cb(session->sock, G_IO_IN, session);
 417
 418         if (ret == TRUE)
 419                 session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 420                                                  session_read_msg_cb, session);
 421
 422         return FALSE;
 423 }
 424
 425 /*!
 426  *\brief        parent (child?): send data to other process
 427  *
 428  *\param        session Contains session information
 429  *              data Data to send
 430  *              size Bytes to send
 431  *
 432  *\return        0 : success
 433  *              -1 : error
 434  */
 435 gint session_send_data(Session *session, const guchar *data, guint size)
 436 {
 437         gboolean ret;
 438
 439         g_return_val_if_fail(session->write_data == NULL, -1);
 440         g_return_val_if_fail(data != NULL, -1);
 441         g_return_val_if_fail(size != 0, -1);
 442
 443         session->state = SESSION_SEND;
 444
 445         session->write_data = data;
 446         session->write_data_p = session->write_data;
 447         session->write_data_len = size;
 448         g_get_current_time(&session->tv_prev);
 449
 450         ret = session_write_data_cb(session->sock, G_IO_OUT, session);
 451
 452         if (ret == TRUE)
 453                 session->io_tag = sock_add_watch(session->sock, G_IO_OUT,
 454                                                  session_write_data_cb,
 455                                                  session);
 456         else if (session->state == SESSION_ERROR)
 457                 return -1;
 458
 459         return 0;
 460 }
 461
 462 gint session_recv_data(Session *session, guint size, const gchar *terminator)
 463 {
 464         g_return_val_if_fail(session->read_data_buf->len == 0, -1);
 465
 466         session->state = SESSION_RECV;
 467
 468         g_free(session->read_data_terminator);
 469         session->read_data_terminator = g_strdup(terminator);
 470         g_get_current_time(&session->tv_prev);
 471
 472         if (session->read_buf_len > 0)
 473                 g_idle_add(session_recv_data_idle_cb, session);
 474         else
 475                 session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 476                                                  session_read_data_cb, session);
 477
 478         return 0;
 479 }
 480
 481 static gboolean session_recv_data_idle_cb(gpointer data)
 482 {
 483         Session *session = SESSION(data);
 484         gboolean ret;
 485
 486         ret = session_read_data_cb(session->sock, G_IO_IN, session);
 487
 488         if (ret == TRUE)
 489                 session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 490                                                  session_read_data_cb, session);
 491
 492         return FALSE;
 493 }
 494
 495 static gboolean session_read_msg_cb(SockInfo *source, GIOCondition condition,
 496                                     gpointer data)
 497 {
 498         Session *session = SESSION(data);
 499         gchar buf[SESSION_BUFFSIZE];
 500         gint line_len;
 501         gchar *newline;
 502         gchar *msg;
 503         gint ret;
 504
 505         g_return_val_if_fail(condition == G_IO_IN, FALSE);
 506
 507         session_set_timeout(session, session->timeout_interval);
 508
 509         if (session->read_buf_len == 0) {
 510                 gint read_len;
 511
 512                 read_len = sock_read(session->sock, session->read_buf,
 513                                      SESSION_BUFFSIZE - 1);
 514
 515                 if (read_len == -1 && session->state == SESSION_DISCONNECTED) {
 516                         g_warning ("sock_read: session disconnected\n");
 517                         if (session->io_tag > 0) {
 518                                 g_source_remove(session->io_tag);
 519                                 session->io_tag = 0;
 520                         }
 521                         return FALSE;
 522                 }
 523
 524                 if (read_len == 0) {
 525                         g_warning("sock_read: received EOF\n");
 526                         session->state = SESSION_EOF;
 527                         return FALSE;
 528                 }
 529
 530                 if (read_len < 0) {
 531                         switch (errno) {
 532                         case EAGAIN:
 533                                 return TRUE;
 534                         default:
 535                                 g_warning("sock_read: %s\n", g_strerror(errno));
 536                                 session->state = SESSION_ERROR;
 537                                 return FALSE;
 538                         }
 539                 }
 540
 541                 session->read_buf_len = read_len;
 542         }
 543
 544         if ((newline = memchr(session->read_buf_p, '\n', session->read_buf_len))
 545                 != NULL)
 546                 line_len = newline - session->read_buf_p + 1;
 547         else
 548                 line_len = session->read_buf_len;
 549
 550         if (line_len == 0)
 551                 return TRUE;
 552
 553         memcpy(buf, session->read_buf_p, line_len);
 554         buf[line_len] = '\0';
 555
 556         g_string_append(session->read_msg_buf, buf);
 557
 558         session->read_buf_len -= line_len;
 559         if (session->read_buf_len == 0)
 560                 session->read_buf_p = session->read_buf;
 561         else
 562                 session->read_buf_p += line_len;
 563
 564         /* incomplete read */
 565         if (buf[line_len - 1] != '\n')
 566                 return TRUE;
 567
 568         /* complete */
 569         if (session->io_tag > 0) {
 570                 g_source_remove(session->io_tag);
 571                 session->io_tag = 0;
 572         }
 573
 574         /* callback */
 575         msg = g_strdup(session->read_msg_buf->str);
 576         strretchomp(msg);
 577         g_string_truncate(session->read_msg_buf, 0);
 578
 579         ret = session->recv_msg(session, msg);
 580         session->recv_msg_notify(session, msg, session->recv_msg_notify_data);
 581
 582         g_free(msg);
 583
 584         if (ret < 0)
 585                 session->state = SESSION_ERROR;
 586
 587         return FALSE;
 588 }
 589
 590 static gboolean session_read_data_cb(SockInfo *source, GIOCondition condition,
 591                                      gpointer data)
 592 {
 593         Session *session = SESSION(data);
 594         GByteArray *data_buf;
 595         gint terminator_len;
 596         gboolean complete = FALSE;
 597         guint data_len;
 598         gint ret;
 599
 600         g_return_val_if_fail(condition == G_IO_IN, FALSE);
 601
 602         session_set_timeout(session, session->timeout_interval);
 603
 604         if (session->read_buf_len == 0) {
 605                 gint read_len;
 606
 607                 read_len = sock_read(session->sock, session->read_buf,
 608                                      SESSION_BUFFSIZE);
 609
 610                 if (read_len == 0) {
 611                         g_warning("sock_read: received EOF\n");
 612                         session->state = SESSION_EOF;
 613                         return FALSE;
 614                 }
 615
 616                 if (read_len < 0) {
 617                         switch (errno) {
 618                         case EAGAIN:
 619                                 return TRUE;
 620                         default:
 621                                 g_warning("sock_read: %s\n", g_strerror(errno));
 622                                 session->state = SESSION_ERROR;
 623                                 return FALSE;
 624                         }
 625                 }
 626
 627                 session->read_buf_len = read_len;
 628         }
 629
 630         data_buf = session->read_data_buf;
 631         terminator_len = strlen(session->read_data_terminator);
 632
 633         if (session->read_buf_len == 0)
 634                 return TRUE;
 635
 636         g_byte_array_append(data_buf, session->read_buf_p,
 637                             session->read_buf_len);
 638
 639         session->read_buf_len = 0;
 640         session->read_buf_p = session->read_buf;
 641
 642         /* check if data is terminated */
 643         if (data_buf->len >= terminator_len) {
 644                 if (memcmp(data_buf->data, session->read_data_terminator,
 645                            terminator_len) == 0)
 646                         complete = TRUE;
 647                 else if (data_buf->len >= terminator_len + 2 &&
 648                          memcmp(data_buf->data + data_buf->len -
 649                                 (terminator_len + 2), "\r\n", 2) == 0 &&
 650                          memcmp(data_buf->data + data_buf->len -
 651                                 terminator_len, session->read_data_terminator,
 652                                 terminator_len) == 0)
 653                         complete = TRUE;
 654         }
 655
 656         /* incomplete read */
 657         if (!complete) {
 658                 GTimeVal tv_cur;
 659
 660                 g_get_current_time(&tv_cur);
 661                 if (tv_cur.tv_sec - session->tv_prev.tv_sec > 0 ||
 662                     tv_cur.tv_usec - session->tv_prev.tv_usec >
 663                     UI_REFRESH_INTERVAL) {
 664                         session->recv_data_progressive_notify
 665                                 (session, data_buf->len, 0,
 666                                  session->recv_data_progressive_notify_data);
 667                         g_get_current_time(&session->tv_prev);
 668                 }
 669                 return TRUE;
 670         }
 671
 672         /* complete */
 673         if (session->io_tag > 0) {
 674                 g_source_remove(session->io_tag);
 675                 session->io_tag = 0;
 676         }
 677
 678         data_len = data_buf->len - terminator_len;
 679
 680         /* callback */
 681         ret = session->recv_data_finished(session, (gchar *)data_buf->data,
 682                                           data_len);
 683
 684         g_byte_array_set_size(data_buf, 0);
 685
 686         session->recv_data_notify(session, data_len,
 687                                   session->recv_data_notify_data);
 688
 689         if (ret < 0)
 690                 session->state = SESSION_ERROR;
 691
 692         return FALSE;
 693 }
 694
 695 static gint session_write_buf(Session *session)
 696 {
 697         gint write_len;
 698         gint to_write_len;
 699
 700         g_return_val_if_fail(session->write_buf != NULL, -1);
 701         g_return_val_if_fail(session->write_buf_p != NULL, -1);
 702         g_return_val_if_fail(session->write_buf_len > 0, -1);
 703
 704         to_write_len = session->write_buf_len -
 705                 (session->write_buf_p - session->write_buf);
 706         to_write_len = MIN(to_write_len, SESSION_BUFFSIZE);
 707
 708         write_len = sock_write(session->sock, session->write_buf_p,
 709                                to_write_len);
 710
 711         if (write_len < 0) {
 712                 switch (errno) {
 713                 case EAGAIN:
 714                         write_len = 0;
 715                         break;
 716                 default:
 717                         g_warning("sock_write: %s\n", g_strerror(errno));
 718                         session->state = SESSION_ERROR;
 719                         return -1;
 720                 }
 721         }
 722
 723         /* incomplete write */
 724         if (session->write_buf_p - session->write_buf + write_len <
 725             session->write_buf_len) {
 726                 session->write_buf_p += write_len;
 727                 return 1;
 728         }
 729
 730         g_free(session->write_buf);
 731         session->write_buf = NULL;
 732         session->write_buf_p = NULL;
 733         session->write_buf_len = 0;
 734
 735         return 0;
 736 }
 737
 738 static gint session_write_data(Session *session)
 739 {
 740         gint write_len;
 741         gint to_write_len;
 742
 743         g_return_val_if_fail(session->write_data != NULL, -1);
 744         g_return_val_if_fail(session->write_data_p != NULL, -1);
 745         g_return_val_if_fail(session->write_data_len > 0, -1);
 746
 747         to_write_len = session->write_data_len -
 748                 (session->write_data_p - session->write_data);
 749         to_write_len = MIN(to_write_len, SESSION_BUFFSIZE);
 750
 751         write_len = sock_write(session->sock, session->write_data_p,
 752                                to_write_len);
 753
 754         if (write_len < 0) {
 755                 switch (errno) {
 756                 case EAGAIN:
 757                         write_len = 0;
 758                         break;
 759                 default:
 760                         g_warning("sock_write: %s\n", g_strerror(errno));
 761                         session->state = SESSION_ERROR;
 762                         return -1;
 763                 }
 764         }
 765
 766         /* incomplete write */
 767         if (session->write_data_p - session->write_data + write_len <
 768             session->write_data_len) {
 769                 session->write_data_p += write_len;
 770                 return 1;
 771         }
 772
 773         session->write_data = NULL;
 774         session->write_data_p = NULL;
 775         session->write_data_len = 0;
 776
 777         return 0;
 778 }
 779
 780 static gboolean session_write_msg_cb(SockInfo *source, GIOCondition condition,
 781                                      gpointer data)
 782 {
 783         Session *session = SESSION(data);
 784         gint ret;
 785
 786         g_return_val_if_fail(condition == G_IO_OUT, FALSE);
 787         g_return_val_if_fail(session->write_buf != NULL, FALSE);
 788         g_return_val_if_fail(session->write_buf_p != NULL, FALSE);
 789         g_return_val_if_fail(session->write_buf_len > 0, FALSE);
 790
 791         ret = session_write_buf(session);
 792
 793         if (ret < 0) {
 794                 session->state = SESSION_ERROR;
 795                 return FALSE;
 796         } else if (ret > 0)
 797                 return TRUE;
 798
 799         if (session->io_tag > 0) {
 800                 g_source_remove(session->io_tag);
 801                 session->io_tag = 0;
 802         }
 803
 804         session_recv_msg(session);
 805
 806         return FALSE;
 807 }
 808
 809 static gboolean session_write_data_cb(SockInfo *source,
 810                                       GIOCondition condition, gpointer data)
 811 {
 812         Session *session = SESSION(data);
 813         guint write_data_len;
 814         gint ret;
 815
 816         g_return_val_if_fail(condition == G_IO_OUT, FALSE);
 817         g_return_val_if_fail(session->write_data != NULL, FALSE);
 818         g_return_val_if_fail(session->write_data_p != NULL, FALSE);
 819         g_return_val_if_fail(session->write_data_len > 0, FALSE);
 820
 821         write_data_len = session->write_data_len;
 822
 823         ret = session_write_data(session);
 824
 825         if (ret < 0) {
 826                 session->state = SESSION_ERROR;
 827                 return FALSE;
 828         } else if (ret > 0) {
 829                 GTimeVal tv_cur;
 830
 831                 g_get_current_time(&tv_cur);
 832                 if (tv_cur.tv_sec - session->tv_prev.tv_sec > 0 ||
 833                     tv_cur.tv_usec - session->tv_prev.tv_usec >
 834                     UI_REFRESH_INTERVAL) {
 835                         session_set_timeout(session, session->timeout_interval);
 836                         session->send_data_progressive_notify
 837                                 (session,
 838                                  session->write_data_p - session->write_data,
 839                                  write_data_len,
 840                                  session->send_data_progressive_notify_data);
 841                         g_get_current_time(&session->tv_prev);
 842                 }
 843                 return TRUE;
 844         }
 845
 846         if (session->io_tag > 0) {
 847                 g_source_remove(session->io_tag);
 848                 session->io_tag = 0;
 849         }
 850
 851         /* callback */
 852         ret = session->send_data_finished(session, write_data_len);
 853         session->send_data_notify(session, write_data_len,
 854                                   session->send_data_notify_data);
 855
 856         return FALSE;
 857 }