src/common/session.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2012 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 #include "claws-features.h"
  23 #endif
  24
  25 #include "defs.h"
  26
  27 #include <glib.h>
  28 #include <glib/gi18n.h>
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <unistd.h>
  34 #include <time.h>
  35 #include <errno.h>
  36
  37 #include "session.h"
  38 #include "utils.h"
  39 #include "log.h"
  40
  41 static gint session_connect_cb          (SockInfo       *sock,
  42                                          gpointer        data);
  43 static gint session_close               (Session        *session);
  44
  45 static gboolean session_timeout_cb      (gpointer        data);
  46
  47 static gboolean session_recv_msg_idle_cb        (gpointer        data);
  48 static gboolean session_recv_data_idle_cb       (gpointer        data);
  49
  50 static gboolean session_read_msg_cb     (SockInfo       *source,
  51                                          GIOCondition    condition,
  52                                          gpointer        data);
  53 static gboolean session_read_data_cb    (SockInfo       *source,
  54                                          GIOCondition    condition,
  55                                          gpointer        data);
  56 static gboolean session_write_msg_cb    (SockInfo       *source,
  57                                          GIOCondition    condition,
  58                                          gpointer        data);
  59 static gboolean session_write_data_cb   (SockInfo       *source,
  60                                          GIOCondition    condition,
  61                                          gpointer        data);
  62
  63
  64 void session_init(Session *session, const void *prefs_account, gboolean is_smtp)
  65 {
  66         session->type = SESSION_UNKNOWN;
  67         session->sock = NULL;
  68         session->server = NULL;
  69         session->port = 0;
  70 #ifdef USE_GNUTLS
  71         session->ssl_type = SSL_NONE;
  72 #endif
  73         session->nonblocking = TRUE;
  74         session->state = SESSION_READY;
  75         session->last_access_time = time(NULL);
  76
  77         g_get_current_time(&session->tv_prev);
  78
  79         session->conn_id = 0;
  80
  81         session->io_tag = 0;
  82
  83         session->read_buf_p = session->read_buf;
  84         session->read_buf_len = 0;
  85
  86         session->read_msg_buf = g_string_sized_new(1024);
  87         session->read_data_buf = g_byte_array_new();
  88
  89         session->write_buf = NULL;
  90         session->write_buf_p = NULL;
  91         session->write_buf_len = 0;
  92
  93         session->write_data = NULL;
  94         session->write_data_p = NULL;
  95         session->write_data_len = 0;
  96
  97         session->timeout_tag = 0;
  98         session->timeout_interval = 0;
  99
 100         session->data = NULL;
 101         session->account = prefs_account;
 102         session->is_smtp = is_smtp;
 103
 104         session->ping_tag = -1;
 105 }
 106
 107 /*!
 108  *\brief        Set up parent and child process
 109  *              Childloop: Read commands from parent,
 110  *              send to server, get answer, pass to parent
 111  *
 112  *\param        session Contains session information
 113  *              server to connect to
 114  *              port to connect to
 115  *
 116  *\return        0 : success
 117  *              -1 : pipe / fork errors (parent)
 118  *               1 : connection error (child)
 119  */
 120 gint session_connect(Session *session, const gchar *server, gushort port)
 121 {
 122 #ifdef G_OS_UNIX
 123         session->server = g_strdup(server);
 124         session->port = port;
 125
 126         session->conn_id = sock_connect_async(server, port, session_connect_cb,
 127                                               session);
 128         if (session->conn_id < 0) {
 129                 g_warning("can't connect to server.");
 130                 session_close(session);
 131                 return -1;
 132         }
 133
 134         return 0;
 135 #else
 136         SockInfo *sock;
 137
 138         session->server = g_strdup(server);
 139         session->port = port;
 140
 141         sock = sock_connect(server, port);
 142         if (sock == NULL) {
 143                 g_warning("can't connect to server.");
 144                 session_close(session);
 145                 return -1;
 146         }
 147         sock->is_smtp = session->is_smtp;
 148
 149         return session_connect_cb(sock, session);
 150 #endif
 151 }
 152
 153 static gint session_connect_cb(SockInfo *sock, gpointer data)
 154 {
 155         Session *session = SESSION(data);
 156
 157         session->conn_id = 0;
 158
 159         if (!sock) {
 160                 g_warning("can't connect to server.");
 161                 session->state = SESSION_ERROR;
 162                 return -1;
 163         }
 164
 165         session->sock = sock;
 166         sock->account = session->account;
 167         sock->is_smtp = session->is_smtp;
 168         sock->ssl_cert_auto_accept = session->ssl_cert_auto_accept;
 169
 170 #ifdef USE_GNUTLS
 171         sock->gnutls_priority = session->gnutls_priority;
 172
 173         if (session->ssl_type == SSL_TUNNEL) {
 174                 sock_set_nonblocking_mode(sock, FALSE);
 175                 if (!ssl_init_socket(sock)) {
 176                         g_warning("can't initialize SSL.");
 177                         log_error(LOG_PROTOCOL, _("SSL handshake failed\n"));
 178                         session->state = SESSION_ERROR;
 179                         return -1;
 180                 }
 181         }
 182 #endif
 183
 184         /* we could have gotten a timeout while waiting for user input in
 185          * an SSL certificate dialog */
 186         if (session->state == SESSION_TIMEOUT)
 187                 return -1;
 188
 189         sock_set_nonblocking_mode(sock, session->nonblocking);
 190
 191         debug_print("session (%p): connected\n", session);
 192
 193         session->state = SESSION_RECV;
 194         session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 195                                          session_read_msg_cb,
 196                                          session);
 197
 198         return 0;
 199 }
 200
 201 /*!
 202  *\brief        child and parent: send DISCONNECT message to other process
 203  *
 204  *\param        session Contains session information
 205  *
 206  *\return        0 : success
 207  */
 208 gint session_disconnect(Session *session)
 209 {
 210         session_close(session);
 211         return 0;
 212 }
 213
 214 /*!
 215  *\brief        parent ?
 216  *
 217  *\param        session Contains session information
 218  */
 219 void session_destroy(Session *session)
 220 {
 221         cm_return_if_fail(session != NULL);
 222         cm_return_if_fail(session->destroy != NULL);
 223
 224         session_register_ping(session, NULL);
 225
 226         session_close(session);
 227         session->destroy(session);
 228         g_free(session->server);
 229         g_string_free(session->read_msg_buf, TRUE);
 230         g_byte_array_free(session->read_data_buf, TRUE);
 231         g_free(session->read_data_terminator);
 232         g_free(session->write_buf);
 233 #ifdef USE_GNUTLS
 234         g_free(session->gnutls_priority);
 235 #endif
 236
 237         debug_print("session (%p): destroyed\n", session);
 238
 239         g_free(session);
 240 }
 241
 242 gboolean session_is_running(Session *session)
 243 {
 244         return (session->state == SESSION_READY ||
 245                 session->state == SESSION_SEND ||
 246                 session->state == SESSION_RECV);
 247 }
 248
 249 gboolean session_is_connected(Session *session)
 250 {
 251         return (session->state == SESSION_SEND ||
 252                 session->state == SESSION_RECV);
 253 }
 254
 255 void session_set_access_time(Session *session)
 256 {
 257         session->last_access_time = time(NULL);
 258 }
 259
 260 void session_set_timeout(Session *session, guint interval)
 261 {
 262         if (session->timeout_tag > 0)
 263                 g_source_remove(session->timeout_tag);
 264
 265         session->timeout_interval = interval;
 266         if (interval > 0) {
 267                 if (interval % 1000 == 0)
 268                         session->timeout_tag =
 269                                 g_timeout_add_seconds(interval/1000, session_timeout_cb, session);
 270                 else
 271                         session->timeout_tag =
 272                                 g_timeout_add(interval, session_timeout_cb, session);
 273         } else
 274                 session->timeout_tag = 0;
 275 }
 276
 277 static gboolean session_timeout_cb(gpointer data)
 278 {
 279         Session *session = SESSION(data);
 280
 281         g_warning("session timeout.\n");
 282
 283         if (session->io_tag > 0) {
 284                 g_source_remove(session->io_tag);
 285                 session->io_tag = 0;
 286         }
 287
 288         session->timeout_tag = 0;
 289         session->state = SESSION_TIMEOUT;
 290
 291         return FALSE;
 292 }
 293
 294 void session_set_recv_message_notify(Session *session,
 295                                      RecvMsgNotify notify_func, gpointer data)
 296 {
 297         session->recv_msg_notify = notify_func;
 298         session->recv_msg_notify_data = data;
 299 }
 300
 301 void session_set_recv_data_progressive_notify
 302                                         (Session *session,
 303                                          RecvDataProgressiveNotify notify_func,
 304                                          gpointer data)
 305 {
 306         session->recv_data_progressive_notify = notify_func,
 307         session->recv_data_progressive_notify_data = data;
 308 }
 309
 310 void session_set_recv_data_notify(Session *session, RecvDataNotify notify_func,
 311                                   gpointer data)
 312 {
 313         session->recv_data_notify = notify_func;
 314         session->recv_data_notify_data = data;
 315 }
 316
 317 void session_set_send_data_progressive_notify
 318                                         (Session *session,
 319                                          SendDataProgressiveNotify notify_func,
 320                                          gpointer data)
 321 {
 322         session->send_data_progressive_notify = notify_func;
 323         session->send_data_progressive_notify_data = data;
 324 }
 325
 326 void session_set_send_data_notify(Session *session, SendDataNotify notify_func,
 327                                   gpointer data)
 328 {
 329         session->send_data_notify = notify_func;
 330         session->send_data_notify_data = data;
 331 }
 332
 333 /*!
 334  *\brief        child and parent cleanup (child closes first)
 335  *
 336  *\param        session Contains session information
 337  *
 338  *\return        0 : success
 339  */
 340 static gint session_close(Session *session)
 341 {
 342         cm_return_val_if_fail(session != NULL, -1);
 343
 344 #ifdef G_OS_UNIX
 345         if (session->conn_id > 0) {
 346                 sock_connect_async_cancel(session->conn_id);
 347                 session->conn_id = 0;
 348                 debug_print("session (%p): connection cancelled\n", session);
 349         }
 350 #endif
 351
 352         session_set_timeout(session, 0);
 353
 354         if (session->io_tag > 0) {
 355                 g_source_remove(session->io_tag);
 356                 session->io_tag = 0;
 357         }
 358
 359         if (session->sock) {
 360                 sock_close(session->sock);
 361                 session->sock = NULL;
 362                 session->state = SESSION_DISCONNECTED;
 363                 debug_print("session (%p): closed\n", session);
 364         }
 365
 366         return 0;
 367 }
 368
 369 #ifdef USE_GNUTLS
 370 gint session_start_tls(Session *session)
 371 {
 372         gboolean nb_mode;
 373
 374         nb_mode = sock_is_nonblocking_mode(session->sock);
 375
 376         session->sock->ssl_cert_auto_accept = session->ssl_cert_auto_accept;
 377
 378         if (nb_mode)
 379                 sock_set_nonblocking_mode(session->sock, FALSE);
 380
 381         if (!ssl_init_socket_with_method(session->sock, SSL_METHOD_TLSv1)) {
 382                 g_warning("couldn't start TLS session.\n");
 383                 if (nb_mode)
 384                         sock_set_nonblocking_mode(session->sock, session->nonblocking);
 385                 return -1;
 386         }
 387
 388         if (nb_mode)
 389                 sock_set_nonblocking_mode(session->sock, session->nonblocking);
 390
 391         return 0;
 392 }
 393 #endif
 394
 395 gint session_send_msg(Session *session, SessionMsgType type, const gchar *msg)
 396 {
 397         gboolean ret;
 398
 399         cm_return_val_if_fail(session->write_buf == NULL, -1);
 400         cm_return_val_if_fail(msg != NULL, -1);
 401         cm_return_val_if_fail(msg[0] != '\0', -1);
 402
 403         session->state = SESSION_SEND;
 404         session->write_buf = g_strconcat(msg, "\r\n", NULL);
 405         session->write_buf_p = session->write_buf;
 406         session->write_buf_len = strlen(msg) + 2;
 407
 408         ret = session_write_msg_cb(session->sock, G_IO_OUT, session);
 409
 410         if (ret == TRUE)
 411                 session->io_tag = sock_add_watch(session->sock, G_IO_OUT,
 412                                                  session_write_msg_cb, session);
 413         else if (session->state == SESSION_ERROR)
 414                 return -1;
 415
 416         return 0;
 417 }
 418
 419 gint session_recv_msg(Session *session)
 420 {
 421         cm_return_val_if_fail(session->read_msg_buf->len == 0, -1);
 422
 423         session->state = SESSION_RECV;
 424
 425         if (session->read_buf_len > 0)
 426                 g_idle_add(session_recv_msg_idle_cb, session);
 427         else
 428                 session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 429                                                  session_read_msg_cb, session);
 430
 431         return 0;
 432 }
 433
 434 static gboolean session_recv_msg_idle_cb(gpointer data)
 435 {
 436         Session *session = SESSION(data);
 437         gboolean ret;
 438
 439         ret = session_read_msg_cb(session->sock, G_IO_IN, session);
 440
 441         if (ret == TRUE)
 442                 session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 443                                                  session_read_msg_cb, session);
 444
 445         return FALSE;
 446 }
 447
 448 /*!
 449  *\brief        parent (child?): send data to other process
 450  *
 451  *\param        session Contains session information
 452  *              data Data to send
 453  *              size Bytes to send
 454  *
 455  *\return        0 : success
 456  *              -1 : error
 457  */
 458 gint session_send_data(Session *session, const guchar *data, guint size)
 459 {
 460         gboolean ret;
 461
 462         cm_return_val_if_fail(session->write_data == NULL, -1);
 463         cm_return_val_if_fail(data != NULL, -1);
 464         cm_return_val_if_fail(size != 0, -1);
 465
 466         session->state = SESSION_SEND;
 467
 468         session->write_data = data;
 469         session->write_data_p = session->write_data;
 470         session->write_data_len = size;
 471         g_get_current_time(&session->tv_prev);
 472
 473         ret = session_write_data_cb(session->sock, G_IO_OUT, session);
 474
 475         if (ret == TRUE)
 476                 session->io_tag = sock_add_watch(session->sock, G_IO_OUT,
 477                                                  session_write_data_cb,
 478                                                  session);
 479         else if (session->state == SESSION_ERROR)
 480                 return -1;
 481
 482         return 0;
 483 }
 484
 485 gint session_recv_data(Session *session, guint size, const gchar *terminator)
 486 {
 487         cm_return_val_if_fail(session->read_data_buf->len == 0, -1);
 488
 489         session->state = SESSION_RECV;
 490
 491         g_free(session->read_data_terminator);
 492         session->read_data_terminator = g_strdup(terminator);
 493         g_get_current_time(&session->tv_prev);
 494
 495         if (session->read_buf_len > 0)
 496                 g_idle_add(session_recv_data_idle_cb, session);
 497         else
 498                 session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 499                                                  session_read_data_cb, session);
 500
 501         return 0;
 502 }
 503
 504 static gboolean session_recv_data_idle_cb(gpointer data)
 505 {
 506         Session *session = SESSION(data);
 507         gboolean ret;
 508
 509         ret = session_read_data_cb(session->sock, G_IO_IN, session);
 510
 511         if (ret == TRUE)
 512                 session->io_tag = sock_add_watch(session->sock, G_IO_IN,
 513                                                  session_read_data_cb, session);
 514
 515         return FALSE;
 516 }
 517
 518 static gboolean session_read_msg_cb(SockInfo *source, GIOCondition condition,
 519                                     gpointer data)
 520 {
 521         Session *session = SESSION(data);
 522         gchar buf[SESSION_BUFFSIZE];
 523         gint line_len;
 524         gchar *newline;
 525         gchar *msg;
 526         gint ret;
 527
 528         cm_return_val_if_fail(condition == G_IO_IN, FALSE);
 529
 530         session_set_timeout(session, session->timeout_interval);
 531
 532         if (session->read_buf_len == 0) {
 533                 gint read_len = -1;
 534
 535                 if (session->sock)
 536                         read_len = sock_read(session->sock, session->read_buf,
 537                                      SESSION_BUFFSIZE - 1);
 538
 539                 if (read_len == -1 && session->state == SESSION_DISCONNECTED) {
 540                         g_warning ("sock_read: session disconnected\n");
 541                         if (session->io_tag > 0) {
 542                                 g_source_remove(session->io_tag);
 543                                 session->io_tag = 0;
 544                         }
 545                         return FALSE;
 546                 }
 547
 548                 if (read_len == 0) {
 549                         g_warning("sock_read: received EOF\n");
 550                         session->state = SESSION_EOF;
 551                         return FALSE;
 552                 }
 553
 554                 if (read_len < 0) {
 555                         switch (errno) {
 556                         case EAGAIN:
 557                                 return TRUE;
 558                         default:
 559                                 g_warning("sock_read: %s\n", g_strerror(errno));
 560                                 session->state = SESSION_ERROR;
 561                                 return FALSE;
 562                         }
 563                 }
 564
 565                 session->read_buf_len = read_len;
 566         }
 567
 568         if ((newline = memchr(session->read_buf_p, '\n', session->read_buf_len))
 569                 != NULL)
 570                 line_len = newline - session->read_buf_p + 1;
 571         else
 572                 line_len = session->read_buf_len;
 573
 574         if (line_len == 0)
 575                 return TRUE;
 576
 577         memcpy(buf, session->read_buf_p, line_len);
 578         buf[line_len] = '\0';
 579
 580         g_string_append(session->read_msg_buf, buf);
 581
 582         session->read_buf_len -= line_len;
 583         if (session->read_buf_len == 0)
 584                 session->read_buf_p = session->read_buf;
 585         else
 586                 session->read_buf_p += line_len;
 587
 588         /* incomplete read */
 589         if (buf[line_len - 1] != '\n')
 590                 return TRUE;
 591
 592         /* complete */
 593         if (session->io_tag > 0) {
 594                 g_source_remove(session->io_tag);
 595                 session->io_tag = 0;
 596         }
 597
 598         /* callback */
 599         msg = g_strdup(session->read_msg_buf->str);
 600         strretchomp(msg);
 601         g_string_truncate(session->read_msg_buf, 0);
 602
 603         ret = session->recv_msg(session, msg);
 604         session->recv_msg_notify(session, msg, session->recv_msg_notify_data);
 605
 606         g_free(msg);
 607
 608         if (ret < 0)
 609                 session->state = SESSION_ERROR;
 610
 611         return FALSE;
 612 }
 613
 614 static gboolean session_read_data_cb(SockInfo *source, GIOCondition condition,
 615                                      gpointer data)
 616 {
 617         Session *session = SESSION(data);
 618         GByteArray *data_buf;
 619         gint terminator_len;
 620         gboolean complete = FALSE;
 621         guint data_len;
 622         gint ret;
 623
 624         cm_return_val_if_fail(condition == G_IO_IN, FALSE);
 625
 626         session_set_timeout(session, session->timeout_interval);
 627
 628         if (session->read_buf_len == 0) {
 629                 gint read_len;
 630
 631                 read_len = sock_read(session->sock, session->read_buf,
 632                                      SESSION_BUFFSIZE);
 633
 634                 if (read_len == 0) {
 635                         g_warning("sock_read: received EOF\n");
 636                         session->state = SESSION_EOF;
 637                         return FALSE;
 638                 }
 639
 640                 if (read_len < 0) {
 641                         switch (errno) {
 642                         case EAGAIN:
 643                                 return TRUE;
 644                         default:
 645                                 g_warning("sock_read: %s\n", g_strerror(errno));
 646                                 session->state = SESSION_ERROR;
 647                                 return FALSE;
 648                         }
 649                 }
 650
 651                 session->read_buf_len = read_len;
 652         }
 653
 654         data_buf = session->read_data_buf;
 655         terminator_len = strlen(session->read_data_terminator);
 656
 657         if (session->read_buf_len == 0)
 658                 return TRUE;
 659
 660         g_byte_array_append(data_buf, session->read_buf_p,
 661                             session->read_buf_len);
 662
 663         session->read_buf_len = 0;
 664         session->read_buf_p = session->read_buf;
 665
 666         /* check if data is terminated */
 667         if (data_buf->len >= terminator_len) {
 668                 if (memcmp(data_buf->data, session->read_data_terminator,
 669                            terminator_len) == 0)
 670                         complete = TRUE;
 671                 else if (data_buf->len >= terminator_len + 2 &&
 672                          memcmp(data_buf->data + data_buf->len -
 673                                 (terminator_len + 2), "\r\n", 2) == 0 &&
 674                          memcmp(data_buf->data + data_buf->len -
 675                                 terminator_len, session->read_data_terminator,
 676                                 terminator_len) == 0)
 677                         complete = TRUE;
 678         }
 679
 680         /* incomplete read */
 681         if (!complete) {
 682                 GTimeVal tv_cur;
 683
 684                 g_get_current_time(&tv_cur);
 685                 if (tv_cur.tv_sec - session->tv_prev.tv_sec > 0 ||
 686                     tv_cur.tv_usec - session->tv_prev.tv_usec >
 687                     UI_REFRESH_INTERVAL) {
 688                         session->recv_data_progressive_notify
 689                                 (session, data_buf->len, 0,
 690                                  session->recv_data_progressive_notify_data);
 691                         g_get_current_time(&session->tv_prev);
 692                 }
 693                 return TRUE;
 694         }
 695
 696         /* complete */
 697         if (session->io_tag > 0) {
 698                 g_source_remove(session->io_tag);
 699                 session->io_tag = 0;
 700         }
 701
 702         data_len = data_buf->len - terminator_len;
 703
 704         /* callback */
 705         ret = session->recv_data_finished(session, (gchar *)data_buf->data,
 706                                           data_len);
 707
 708         g_byte_array_set_size(data_buf, 0);
 709
 710         session->recv_data_notify(session, data_len,
 711                                   session->recv_data_notify_data);
 712
 713         if (ret < 0)
 714                 session->state = SESSION_ERROR;
 715
 716         return FALSE;
 717 }
 718
 719 static gint session_write_buf(Session *session)
 720 {
 721         gint write_len;
 722         gint to_write_len;
 723
 724         cm_return_val_if_fail(session->write_buf != NULL, -1);
 725         cm_return_val_if_fail(session->write_buf_p != NULL, -1);
 726         cm_return_val_if_fail(session->write_buf_len > 0, -1);
 727
 728         to_write_len = session->write_buf_len -
 729                 (session->write_buf_p - session->write_buf);
 730         to_write_len = MIN(to_write_len, SESSION_BUFFSIZE);
 731
 732         write_len = sock_write(session->sock, session->write_buf_p,
 733                                to_write_len);
 734
 735         if (write_len < 0) {
 736                 switch (errno) {
 737                 case EAGAIN:
 738                         write_len = 0;
 739                         break;
 740                 default:
 741                         g_warning("sock_write: %s\n", g_strerror(errno));
 742                         session->state = SESSION_ERROR;
 743                         return -1;
 744                 }
 745         }
 746
 747         /* incomplete write */
 748         if (session->write_buf_p - session->write_buf + write_len <
 749             session->write_buf_len) {
 750                 session->write_buf_p += write_len;
 751                 return 1;
 752         }
 753
 754         g_free(session->write_buf);
 755         session->write_buf = NULL;
 756         session->write_buf_p = NULL;
 757         session->write_buf_len = 0;
 758
 759         return 0;
 760 }
 761
 762 static gint session_write_data(Session *session)
 763 {
 764         gint write_len;
 765         gint to_write_len;
 766
 767         cm_return_val_if_fail(session->write_data != NULL, -1);
 768         cm_return_val_if_fail(session->write_data_p != NULL, -1);
 769         cm_return_val_if_fail(session->write_data_len > 0, -1);
 770
 771         to_write_len = session->write_data_len -
 772                 (session->write_data_p - session->write_data);
 773         to_write_len = MIN(to_write_len, SESSION_BUFFSIZE);
 774
 775         write_len = sock_write(session->sock, session->write_data_p,
 776                                to_write_len);
 777
 778         if (write_len < 0) {
 779                 switch (errno) {
 780                 case EAGAIN:
 781                         write_len = 0;
 782                         break;
 783                 default:
 784                         g_warning("sock_write: %s\n", g_strerror(errno));
 785                         session->state = SESSION_ERROR;
 786                         return -1;
 787                 }
 788         }
 789
 790         /* incomplete write */
 791         if (session->write_data_p - session->write_data + write_len <
 792             session->write_data_len) {
 793                 session->write_data_p += write_len;
 794                 return 1;
 795         }
 796
 797         session->write_data = NULL;
 798         session->write_data_p = NULL;
 799         session->write_data_len = 0;
 800
 801         return 0;
 802 }
 803
 804 static gboolean session_write_msg_cb(SockInfo *source, GIOCondition condition,
 805                                      gpointer data)
 806 {
 807         Session *session = SESSION(data);
 808         gint ret;
 809
 810         cm_return_val_if_fail(condition == G_IO_OUT, FALSE);
 811         cm_return_val_if_fail(session->write_buf != NULL, FALSE);
 812         cm_return_val_if_fail(session->write_buf_p != NULL, FALSE);
 813         cm_return_val_if_fail(session->write_buf_len > 0, FALSE);
 814
 815         ret = session_write_buf(session);
 816
 817         if (ret < 0) {
 818                 session->state = SESSION_ERROR;
 819                 return FALSE;
 820         } else if (ret > 0)
 821                 return TRUE;
 822
 823         if (session->io_tag > 0) {
 824                 g_source_remove(session->io_tag);
 825                 session->io_tag = 0;
 826         }
 827
 828         session_recv_msg(session);
 829
 830         return FALSE;
 831 }
 832
 833 static gboolean session_write_data_cb(SockInfo *source,
 834                                       GIOCondition condition, gpointer data)
 835 {
 836         Session *session = SESSION(data);
 837         guint write_data_len;
 838         gint ret;
 839
 840         cm_return_val_if_fail(condition == G_IO_OUT, FALSE);
 841         cm_return_val_if_fail(session->write_data != NULL, FALSE);
 842         cm_return_val_if_fail(session->write_data_p != NULL, FALSE);
 843         cm_return_val_if_fail(session->write_data_len > 0, FALSE);
 844
 845         write_data_len = session->write_data_len;
 846
 847         ret = session_write_data(session);
 848
 849         if (ret < 0) {
 850                 session->state = SESSION_ERROR;
 851                 return FALSE;
 852         } else if (ret > 0) {
 853                 GTimeVal tv_cur;
 854
 855                 g_get_current_time(&tv_cur);
 856                 if (tv_cur.tv_sec - session->tv_prev.tv_sec > 0 ||
 857                     tv_cur.tv_usec - session->tv_prev.tv_usec >
 858                     UI_REFRESH_INTERVAL) {
 859                         session_set_timeout(session, session->timeout_interval);
 860                         session->send_data_progressive_notify
 861                                 (session,
 862                                  session->write_data_p - session->write_data,
 863                                  write_data_len,
 864                                  session->send_data_progressive_notify_data);
 865                         g_get_current_time(&session->tv_prev);
 866                 }
 867                 return TRUE;
 868         }
 869
 870         if (session->io_tag > 0) {
 871                 g_source_remove(session->io_tag);
 872                 session->io_tag = 0;
 873         }
 874
 875         /* callback */
 876         ret = session->send_data_finished(session, write_data_len);
 877         session->send_data_notify(session, write_data_len,
 878                                   session->send_data_notify_data);
 879
 880         return FALSE;
 881 }
 882
 883 void session_register_ping(Session *session, gboolean (*ping_cb)(gpointer data))
 884 {
 885         if (!session)
 886                 return;
 887         if (session->ping_tag > -1)
 888                 g_source_remove(session->ping_tag);
 889
 890         session->ping_tag = -1;
 891
 892         if (ping_cb != NULL)
 893         session->ping_tag = g_timeout_add_seconds(60, ping_cb, session);
 894 }