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 2 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, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  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)
  64 {
  65         session->type = SESSION_UNKNOWN;
  66         session->sock = NULL;
  67         session->server = NULL;
  68         session->port = 0;
  69 #if USE_OPENSSL
  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 }
 101
 102 /*!
 103  *\brief        Set up parent and child process
 104  *              Childloop: Read commands from parent,
 105  *              send to server, get answer, pass to parent
 106  *
 107  *\param        session Contains session information
 108  *              server to connect to
 109  *              port to connect to
 110  *
 111  *\return        0 : success
 112  *              -1 : pipe / fork errors (parent)
 113  *               1 : connection error (child)
 114  */
 115 gint session_connect(Session *session, const gchar *server, gushort port)
 116 {
 117 #ifdef G_OS_UNIX
 118         session->server = g_strdup(server);
 119         session->port = port;
 120
 121         session->conn_id = sock_connect_async(server, port, session_connect_cb,
 122                                               session);
 123         if (session->conn_id < 0) {
 124                 g_warning("can't connect to server.");
 125                 session_close(session);
 126                 return -1;
 127         }
 128
 129         return 0;
 130 #else
 131         SockInfo *sock;
 132
 133         session->server = g_strdup(server);
 134         session->port = port;
 135
 136         sock = sock_connect(server, port);
 137         if (sock == NULL) {
 138                 g_warning("can't connect to server.");
 139                 session_close(session);
 140                 return -1;
 141         }
 142
 143         return session_connect_cb(sock, session);
 144 #endif
 145 }
 146
 147 static gint session_connect_cb(SockInfo *sock, gpointer data)
 148 {
 149         Session *session = SESSION(data);
 150
 151         session->conn_id = 0;
 152
 153         if (!sock) {
 154                 g_warning("can't connect to server.");
 155                 session->state = SESSION_ERROR;
 156                 return -1;
 157         }
 158
 159         session->sock = sock;
 160
 161 #if USE_OPENSSL
 162         if (session->ssl_type == SSL_TUNNEL) {
 163                 sock_set_nonblocking_mode(sock, FALSE);
 164                 if (!ssl_init_socket(sock)) {
 165                         g_warning("can't initialize SSL.");
 166                         log_error(LOG_PROTOCOL, _("SSL handshake failed\n"));
 167                         session->state = SESSION_ERROR;
 168                         return -1;
 169                 }
 170         }
 171 #endif
 172
 173         sock_set_nonblocking_mode(sock, session->nonblocking);
 174
 175         debug_print("session (%p): connected\n", session);
 176
 177         session->state = SESSION_RECV;
 178         session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 179                                          session_read_msg_cb,
 180                                          session);
 181
 182         return 0;
 183 }
 184
 185 /*!
 186  *\brief        child and parent: send DISCONNECT message to other process
 187  *
 188  *\param        session Contains session information
 189  *
 190  *\return        0 : success
 191  */
 192 gint session_disconnect(Session *session)
 193 {
 194         session_close(session);
 195         return 0;
 196 }
 197
 198 /*!
 199  *\brief        parent ?
 200  *
 201  *\param        session Contains session information
 202  */
 203 void session_destroy(Session *session)
 204 {
 205         g_return_if_fail(session != NULL);
 206         g_return_if_fail(session->destroy != NULL);
 207
 208         session_close(session);
 209         session->destroy(session);
 210         g_free(session->server);
 211         g_string_free(session->read_msg_buf, TRUE);
 212         g_byte_array_free(session->read_data_buf, TRUE);
 213         g_free(session->read_data_terminator);
 214         g_free(session->write_buf);
 215
 216         debug_print("session (%p): destroyed\n", session);
 217
 218         g_free(session);
 219 }
 220
 221 gboolean session_is_connected(Session *session)
 222 {
 223         return (session->state == SESSION_READY ||
 224                 session->state == SESSION_SEND ||
 225                 session->state == SESSION_RECV);
 226 }
 227
 228 void session_set_access_time(Session *session)
 229 {
 230         session->last_access_time = time(NULL);
 231 }
 232
 233 void session_set_timeout(Session *session, guint interval)
 234 {
 235         if (session->timeout_tag > 0)
 236                 g_source_remove(session->timeout_tag);
 237
 238         session->timeout_interval = interval;
 239         if (interval > 0)
 240                 session->timeout_tag =
 241                         g_timeout_add(interval, session_timeout_cb, session);
 242         else
 243                 session->timeout_tag = 0;
 244 }
 245
 246 static gboolean session_timeout_cb(gpointer data)
 247 {
 248         Session *session = SESSION(data);
 249
 250         g_warning("session timeout.\n");
 251
 252         if (session->io_tag > 0) {
 253                 g_source_remove(session->io_tag);
 254                 session->io_tag = 0;
 255         }
 256
 257         session->timeout_tag = 0;
 258         session->state = SESSION_TIMEOUT;
 259
 260         return FALSE;
 261 }
 262
 263 void session_set_recv_message_notify(Session *session,
 264                                      RecvMsgNotify notify_func, gpointer data)
 265 {
 266         session->recv_msg_notify = notify_func;
 267         session->recv_msg_notify_data = data;
 268 }
 269
 270 void session_set_recv_data_progressive_notify
 271                                         (Session *session,
 272                                          RecvDataProgressiveNotify notify_func,
 273                                          gpointer data)
 274 {
 275         session->recv_data_progressive_notify = notify_func,
 276         session->recv_data_progressive_notify_data = data;
 277 }
 278
 279 void session_set_recv_data_notify(Session *session, RecvDataNotify notify_func,
 280                                   gpointer data)
 281 {
 282         session->recv_data_notify = notify_func;
 283         session->recv_data_notify_data = data;
 284 }
 285
 286 void session_set_send_data_progressive_notify
 287                                         (Session *session,
 288                                          SendDataProgressiveNotify notify_func,
 289                                          gpointer data)
 290 {
 291         session->send_data_progressive_notify = notify_func;
 292         session->send_data_progressive_notify_data = data;
 293 }
 294
 295 void session_set_send_data_notify(Session *session, SendDataNotify notify_func,
 296                                   gpointer data)
 297 {
 298         session->send_data_notify = notify_func;
 299         session->send_data_notify_data = data;
 300 }
 301
 302 /*!
 303  *\brief        child and parent cleanup (child closes first)
 304  *
 305  *\param        session Contains session information
 306  *
 307  *\return        0 : success
 308  */
 309 static gint session_close(Session *session)
 310 {
 311         g_return_val_if_fail(session != NULL, -1);
 312
 313 #ifdef G_OS_UNIX
 314         if (session->conn_id > 0) {
 315                 sock_connect_async_cancel(session->conn_id);
 316                 session->conn_id = 0;
 317                 debug_print("session (%p): connection cancelled\n", session);
 318         }
 319 #endif
 320
 321         session_set_timeout(session, 0);
 322
 323         if (session->io_tag > 0) {
 324                 g_source_remove(session->io_tag);
 325                 session->io_tag = 0;
 326         }
 327
 328         if (session->sock) {
 329                 sock_close(session->sock);
 330                 session->sock = NULL;
 331                 session->state = SESSION_DISCONNECTED;
 332                 debug_print("session (%p): closed\n", session);
 333         }
 334
 335         return 0;
 336 }
 337
 338 #if USE_OPENSSL
 339 gint session_start_tls(Session *session)
 340 {
 341         gboolean nb_mode;
 342
 343         nb_mode = sock_is_nonblocking_mode(session->sock);
 344
 345         if (nb_mode)
 346                 sock_set_nonblocking_mode(session->sock, FALSE);
 347
 348         if (!ssl_init_socket_with_method(session->sock, SSL_METHOD_TLSv1)) {
 349                 g_warning("couldn't start TLS session.\n");
 350                 if (nb_mode)
 351                         sock_set_nonblocking_mode(session->sock, TRUE);
 352                 return -1;
 353         }
 354
 355         if (nb_mode)
 356                 sock_set_nonblocking_mode(session->sock, session->nonblocking);
 357
 358         return 0;
 359 }
 360 #endif
 361
 362 gint session_send_msg(Session *session, SessionMsgType type, const gchar *msg)
 363 {
 364         gboolean ret;
 365
 366         g_return_val_if_fail(session->write_buf == NULL, -1);
 367         g_return_val_if_fail(msg != NULL, -1);
 368         g_return_val_if_fail(msg[0] != '\0', -1);
 369
 370         session->state = SESSION_SEND;
 371         session->write_buf = g_strconcat(msg, "\r\n", NULL);
 372         session->write_buf_p = session->write_buf;
 373         session->write_buf_len = strlen(msg) + 2;
 374
 375         ret = session_write_msg_cb(session->sock, G_IO_OUT, session);
 376
 377         if (ret == TRUE)
 378                 session->io_tag = sock_add_watch(session->sock, G_IO_OUT,
 379                                                  session_write_msg_cb, session);
 380         else if (session->state == SESSION_ERROR)
 381                 return -1;
 382
 383         return 0;
 384 }
 385
 386 gint session_recv_msg(Session *session)
 387 {
 388         g_return_val_if_fail(session->read_msg_buf->len == 0, -1);
 389
 390         session->state = SESSION_RECV;
 391
 392         if (session->read_buf_len > 0)
 393                 g_idle_add(session_recv_msg_idle_cb, session);
 394         else
 395                 session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 396                                                  session_read_msg_cb, session);
 397
 398         return 0;
 399 }
 400
 401 static gboolean session_recv_msg_idle_cb(gpointer data)
 402 {
 403         Session *session = SESSION(data);
 404         gboolean ret;
 405
 406         ret = session_read_msg_cb(session->sock, G_IO_IN, session);
 407
 408         if (ret == TRUE)
 409                 session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 410                                                  session_read_msg_cb, session);
 411
 412         return FALSE;
 413 }
 414
 415 /*!
 416  *\brief        parent (child?): send data to other process
 417  *
 418  *\param        session Contains session information
 419  *              data Data to send
 420  *              size Bytes to send
 421  *
 422  *\return        0 : success
 423  *              -1 : error
 424  */
 425 gint session_send_data(Session *session, const guchar *data, guint size)
 426 {
 427         gboolean ret;
 428
 429         g_return_val_if_fail(session->write_data == NULL, -1);
 430         g_return_val_if_fail(data != NULL, -1);
 431         g_return_val_if_fail(size != 0, -1);
 432
 433         session->state = SESSION_SEND;
 434
 435         session->write_data = data;
 436         session->write_data_p = session->write_data;
 437         session->write_data_len = size;
 438         g_get_current_time(&session->tv_prev);
 439
 440         ret = session_write_data_cb(session->sock, G_IO_OUT, session);
 441
 442         if (ret == TRUE)
 443                 session->io_tag = sock_add_watch(session->sock, G_IO_OUT,
 444                                                  session_write_data_cb,
 445                                                  session);
 446         else if (session->state == SESSION_ERROR)
 447                 return -1;
 448
 449         return 0;
 450 }
 451
 452 gint session_recv_data(Session *session, guint size, const gchar *terminator)
 453 {
 454         g_return_val_if_fail(session->read_data_buf->len == 0, -1);
 455
 456         session->state = SESSION_RECV;
 457
 458         g_free(session->read_data_terminator);
 459         session->read_data_terminator = g_strdup(terminator);
 460         g_get_current_time(&session->tv_prev);
 461
 462         if (session->read_buf_len > 0)
 463                 g_idle_add(session_recv_data_idle_cb, session);
 464         else
 465                 session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 466                                                  session_read_data_cb, session);
 467
 468         return 0;
 469 }
 470
 471 static gboolean session_recv_data_idle_cb(gpointer data)
 472 {
 473         Session *session = SESSION(data);
 474         gboolean ret;
 475
 476         ret = session_read_data_cb(session->sock, G_IO_IN, session);
 477
 478         if (ret == TRUE)
 479                 session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 480                                                  session_read_data_cb, session);
 481
 482         return FALSE;
 483 }
 484
 485 static gboolean session_read_msg_cb(SockInfo *source, GIOCondition condition,
 486                                     gpointer data)
 487 {
 488         Session *session = SESSION(data);
 489         gchar buf[SESSION_BUFFSIZE];
 490         gint line_len;
 491         gchar *newline;
 492         gchar *msg;
 493         gint ret;
 494
 495         g_return_val_if_fail(condition == G_IO_IN, FALSE);
 496
 497         session_set_timeout(session, session->timeout_interval);
 498
 499         if (session->read_buf_len == 0) {
 500                 gint read_len;
 501
 502                 read_len = sock_read(session->sock, session->read_buf,
 503                                      SESSION_BUFFSIZE - 1);
 504
 505                 if (read_len == -1 && session->state == SESSION_DISCONNECTED) {
 506                         g_warning ("sock_read: session disconnected\n");
 507                         if (session->io_tag > 0) {
 508                                 g_source_remove(session->io_tag);
 509                                 session->io_tag = 0;
 510                         }
 511                         return FALSE;
 512                 }
 513
 514                 if (read_len == 0) {
 515                         g_warning("sock_read: received EOF\n");
 516                         session->state = SESSION_EOF;
 517                         return FALSE;
 518                 }
 519
 520                 if (read_len < 0) {
 521                         switch (errno) {
 522                         case EAGAIN:
 523                                 return TRUE;
 524                         default:
 525                                 g_warning("sock_read: %s\n", g_strerror(errno));
 526                                 session->state = SESSION_ERROR;
 527                                 return FALSE;
 528                         }
 529                 }
 530
 531                 session->read_buf_len = read_len;
 532         }
 533
 534         if ((newline = memchr(session->read_buf_p, '\n', session->read_buf_len))
 535                 != NULL)
 536                 line_len = newline - session->read_buf_p + 1;
 537         else
 538                 line_len = session->read_buf_len;
 539
 540         if (line_len == 0)
 541                 return TRUE;
 542
 543         memcpy(buf, session->read_buf_p, line_len);
 544         buf[line_len] = '\0';
 545
 546         g_string_append(session->read_msg_buf, buf);
 547
 548         session->read_buf_len -= line_len;
 549         if (session->read_buf_len == 0)
 550                 session->read_buf_p = session->read_buf;
 551         else
 552                 session->read_buf_p += line_len;
 553
 554         /* incomplete read */
 555         if (buf[line_len - 1] != '\n')
 556                 return TRUE;
 557
 558         /* complete */
 559         if (session->io_tag > 0) {
 560                 g_source_remove(session->io_tag);
 561                 session->io_tag = 0;
 562         }
 563
 564         /* callback */
 565         msg = g_strdup(session->read_msg_buf->str);
 566         strretchomp(msg);
 567         g_string_truncate(session->read_msg_buf, 0);
 568
 569         ret = session->recv_msg(session, msg);
 570         session->recv_msg_notify(session, msg, session->recv_msg_notify_data);
 571
 572         g_free(msg);
 573
 574         if (ret < 0)
 575                 session->state = SESSION_ERROR;
 576
 577         return FALSE;
 578 }
 579
 580 static gboolean session_read_data_cb(SockInfo *source, GIOCondition condition,
 581                                      gpointer data)
 582 {
 583         Session *session = SESSION(data);
 584         GByteArray *data_buf;
 585         gint terminator_len;
 586         gboolean complete = FALSE;
 587         guint data_len;
 588         gint ret;
 589
 590         g_return_val_if_fail(condition == G_IO_IN, FALSE);
 591
 592         session_set_timeout(session, session->timeout_interval);
 593
 594         if (session->read_buf_len == 0) {
 595                 gint read_len;
 596
 597                 read_len = sock_read(session->sock, session->read_buf,
 598                                      SESSION_BUFFSIZE);
 599
 600                 if (read_len == 0) {
 601                         g_warning("sock_read: received EOF\n");
 602                         session->state = SESSION_EOF;
 603                         return FALSE;
 604                 }
 605
 606                 if (read_len < 0) {
 607                         switch (errno) {
 608                         case EAGAIN:
 609                                 return TRUE;
 610                         default:
 611                                 g_warning("sock_read: %s\n", g_strerror(errno));
 612                                 session->state = SESSION_ERROR;
 613                                 return FALSE;
 614                         }
 615                 }
 616
 617                 session->read_buf_len = read_len;
 618         }
 619
 620         data_buf = session->read_data_buf;
 621         terminator_len = strlen(session->read_data_terminator);
 622
 623         if (session->read_buf_len == 0)
 624                 return TRUE;
 625
 626         g_byte_array_append(data_buf, session->read_buf_p,
 627                             session->read_buf_len);
 628
 629         session->read_buf_len = 0;
 630         session->read_buf_p = session->read_buf;
 631
 632         /* check if data is terminated */
 633         if (data_buf->len >= terminator_len) {
 634                 if (memcmp(data_buf->data, session->read_data_terminator,
 635                            terminator_len) == 0)
 636                         complete = TRUE;
 637                 else if (data_buf->len >= terminator_len + 2 &&
 638                          memcmp(data_buf->data + data_buf->len -
 639                                 (terminator_len + 2), "\r\n", 2) == 0 &&
 640                          memcmp(data_buf->data + data_buf->len -
 641                                 terminator_len, session->read_data_terminator,
 642                                 terminator_len) == 0)
 643                         complete = TRUE;
 644         }
 645
 646         /* incomplete read */
 647         if (!complete) {
 648                 GTimeVal tv_cur;
 649
 650                 g_get_current_time(&tv_cur);
 651                 if (tv_cur.tv_sec - session->tv_prev.tv_sec > 0 ||
 652                     tv_cur.tv_usec - session->tv_prev.tv_usec >
 653                     UI_REFRESH_INTERVAL) {
 654                         session->recv_data_progressive_notify
 655                                 (session, data_buf->len, 0,
 656                                  session->recv_data_progressive_notify_data);
 657                         g_get_current_time(&session->tv_prev);
 658                 }
 659                 return TRUE;
 660         }
 661
 662         /* complete */
 663         if (session->io_tag > 0) {
 664                 g_source_remove(session->io_tag);
 665                 session->io_tag = 0;
 666         }
 667
 668         data_len = data_buf->len - terminator_len;
 669
 670         /* callback */
 671         ret = session->recv_data_finished(session, (gchar *)data_buf->data,
 672                                           data_len);
 673
 674         g_byte_array_set_size(data_buf, 0);
 675
 676         session->recv_data_notify(session, data_len,
 677                                   session->recv_data_notify_data);
 678
 679         if (ret < 0)
 680                 session->state = SESSION_ERROR;
 681
 682         return FALSE;
 683 }
 684
 685 static gint session_write_buf(Session *session)
 686 {
 687         gint write_len;
 688         gint to_write_len;
 689
 690         g_return_val_if_fail(session->write_buf != NULL, -1);
 691         g_return_val_if_fail(session->write_buf_p != NULL, -1);
 692         g_return_val_if_fail(session->write_buf_len > 0, -1);
 693
 694         to_write_len = session->write_buf_len -
 695                 (session->write_buf_p - session->write_buf);
 696         to_write_len = MIN(to_write_len, SESSION_BUFFSIZE);
 697
 698         write_len = sock_write(session->sock, session->write_buf_p,
 699                                to_write_len);
 700
 701         if (write_len < 0) {
 702                 switch (errno) {
 703                 case EAGAIN:
 704                         write_len = 0;
 705                         break;
 706                 default:
 707                         g_warning("sock_write: %s\n", g_strerror(errno));
 708                         session->state = SESSION_ERROR;
 709                         return -1;
 710                 }
 711         }
 712
 713         /* incomplete write */
 714         if (session->write_buf_p - session->write_buf + write_len <
 715             session->write_buf_len) {
 716                 session->write_buf_p += write_len;
 717                 return 1;
 718         }
 719
 720         g_free(session->write_buf);
 721         session->write_buf = NULL;
 722         session->write_buf_p = NULL;
 723         session->write_buf_len = 0;
 724
 725         return 0;
 726 }
 727
 728 static gint session_write_data(Session *session)
 729 {
 730         gint write_len;
 731         gint to_write_len;
 732
 733         g_return_val_if_fail(session->write_data != NULL, -1);
 734         g_return_val_if_fail(session->write_data_p != NULL, -1);
 735         g_return_val_if_fail(session->write_data_len > 0, -1);
 736
 737         to_write_len = session->write_data_len -
 738                 (session->write_data_p - session->write_data);
 739         to_write_len = MIN(to_write_len, SESSION_BUFFSIZE);
 740
 741         write_len = sock_write(session->sock, session->write_data_p,
 742                                to_write_len);
 743
 744         if (write_len < 0) {
 745                 switch (errno) {
 746                 case EAGAIN:
 747                         write_len = 0;
 748                         break;
 749                 default:
 750                         g_warning("sock_write: %s\n", g_strerror(errno));
 751                         session->state = SESSION_ERROR;
 752                         return -1;
 753                 }
 754         }
 755
 756         /* incomplete write */
 757         if (session->write_data_p - session->write_data + write_len <
 758             session->write_data_len) {
 759                 session->write_data_p += write_len;
 760                 return 1;
 761         }
 762
 763         session->write_data = NULL;
 764         session->write_data_p = NULL;
 765         session->write_data_len = 0;
 766
 767         return 0;
 768 }
 769
 770 static gboolean session_write_msg_cb(SockInfo *source, GIOCondition condition,
 771                                      gpointer data)
 772 {
 773         Session *session = SESSION(data);
 774         gint ret;
 775
 776         g_return_val_if_fail(condition == G_IO_OUT, FALSE);
 777         g_return_val_if_fail(session->write_buf != NULL, FALSE);
 778         g_return_val_if_fail(session->write_buf_p != NULL, FALSE);
 779         g_return_val_if_fail(session->write_buf_len > 0, FALSE);
 780
 781         ret = session_write_buf(session);
 782
 783         if (ret < 0) {
 784                 session->state = SESSION_ERROR;
 785                 return FALSE;
 786         } else if (ret > 0)
 787                 return TRUE;
 788
 789         if (session->io_tag > 0) {
 790                 g_source_remove(session->io_tag);
 791                 session->io_tag = 0;
 792         }
 793
 794         session_recv_msg(session);
 795
 796         return FALSE;
 797 }
 798
 799 static gboolean session_write_data_cb(SockInfo *source,
 800                                       GIOCondition condition, gpointer data)
 801 {
 802         Session *session = SESSION(data);
 803         guint write_data_len;
 804         gint ret;
 805
 806         g_return_val_if_fail(condition == G_IO_OUT, FALSE);
 807         g_return_val_if_fail(session->write_data != NULL, FALSE);
 808         g_return_val_if_fail(session->write_data_p != NULL, FALSE);
 809         g_return_val_if_fail(session->write_data_len > 0, FALSE);
 810
 811         write_data_len = session->write_data_len;
 812
 813         ret = session_write_data(session);
 814
 815         if (ret < 0) {
 816                 session->state = SESSION_ERROR;
 817                 return FALSE;
 818         } else if (ret > 0) {
 819                 GTimeVal tv_cur;
 820
 821                 g_get_current_time(&tv_cur);
 822                 if (tv_cur.tv_sec - session->tv_prev.tv_sec > 0 ||
 823                     tv_cur.tv_usec - session->tv_prev.tv_usec >
 824                     UI_REFRESH_INTERVAL) {
 825                         session_set_timeout(session, session->timeout_interval);
 826                         session->send_data_progressive_notify
 827                                 (session,
 828                                  session->write_data_p - session->write_data,
 829                                  write_data_len,
 830                                  session->send_data_progressive_notify_data);
 831                         g_get_current_time(&session->tv_prev);
 832                 }
 833                 return TRUE;
 834         }
 835
 836         if (session->io_tag > 0) {
 837                 g_source_remove(session->io_tag);
 838                 session->io_tag = 0;
 839         }
 840
 841         /* callback */
 842         ret = session->send_data_finished(session, write_data_len);
 843         session->send_data_notify(session, write_data_len,
 844                                   session->send_data_notify_data);
 845
 846         return FALSE;
 847 }