src/common/session.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2003 Hiroyuki Yamamoto
   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <sys/types.h>
  32 #include <unistd.h>
  33 #include <sys/signal.h>
  34 #include <sys/wait.h>
  35 #include <sys/time.h>
  36
  37 #include "session.h"
  38 #include "utils.h"
  39
  40 static gint session_close               (Session        *session);
  41
  42 static gchar *session_recv_msg          (Session        *session);
  43
  44 static guchar *session_read_data        (Session        *session,
  45                                          guint           size);
  46
  47 static gint session_send_data_to_sock           (Session        *session,
  48                                                  const guchar   *data,
  49                                                  guint           size);
  50 static guchar *session_recv_data_from_sock      (Session        *session,
  51                                                  guint           size);
  52
  53 static guchar *session_recv_data_from_sock_unescape     (Session *session,
  54                                                          guint    size,
  55                                                          guint   *actual_size);
  56
  57 gboolean session_parent_input_cb        (GIOChannel     *source,
  58                                          GIOCondition    condition,
  59                                          gpointer        data);
  60
  61 gboolean session_child_input            (Session        *session);
  62
  63
  64 /*!
  65  *\brief        init session members to zero
  66  *
  67  *\param        session to be initialized
  68  */
  69 void session_init(Session *session)
  70 {
  71         session->type = 0;
  72         session->sock = NULL;
  73
  74         session->server = NULL;
  75         session->port = 0;
  76         session->state = SESSION_READY;
  77         session->last_access_time = time(NULL);
  78         session->data = NULL;
  79
  80         session->read_ch = NULL;
  81         session->write_ch = NULL;
  82 }
  83
  84 /*!
  85  *\brief        Set up parent and child process
  86  *              Childloop: Read commands from parent,
  87  *              send to server, get answer, pass to parent
  88  *
  89  *\param        session Contains session information
  90  *              server to connect to
  91  *              port to connect to
  92  *
  93  *\return        0 : success
  94  *              -1 : pipe / fork errors (parent)
  95  *               1 : connection error (child)
  96  */
  97 gint session_connect(Session *session, const gchar *server, gushort port)
  98 {
  99         pid_t pid;
 100         gint pipe_fds1[2], pipe_fds2[2];
 101         SockInfo *sock;
 102         gchar *str;
 103
 104         session->server = g_strdup(server);
 105         session->port = port;
 106
 107         if (pipe(pipe_fds1) < 0) {
 108                 perror("pipe");
 109                 return -1;
 110         }
 111         if (pipe(pipe_fds2) < 0) {
 112                 perror("pipe");
 113                 close(pipe_fds1[0]);
 114                 close(pipe_fds1[1]);
 115                 return -1;
 116         }
 117
 118         if ((pid = fork()) < 0) {
 119                 perror("fork");
 120                 return -1;
 121         }
 122
 123         if (pid != 0) {
 124                 session->child_pid = pid;
 125                 session->read_ch = g_io_channel_unix_new(pipe_fds2[0]);
 126                 session->write_ch = g_io_channel_unix_new(pipe_fds1[1]);
 127                 close(pipe_fds1[0]);
 128                 close(pipe_fds2[1]);
 129                 session->read_tag = g_io_add_watch(session->read_ch, G_IO_IN,
 130                                                    session_parent_input_cb,
 131                                                    session);
 132                 return 0;
 133         }
 134
 135         /* child process */
 136
 137         session->read_ch = g_io_channel_unix_new(pipe_fds1[0]);
 138         session->write_ch = g_io_channel_unix_new(pipe_fds2[1]);
 139         close(pipe_fds1[1]);
 140         close(pipe_fds2[0]);
 141
 142         debug_print("session: child: connecting to %s:%d ...\n", server, port);
 143
 144         if ((sock = sock_connect(server, port)) == NULL) {
 145                 session_send_msg(session, SESSION_MSG_ERROR,
 146                                  "can't connect to server.");
 147                 session_close(session);
 148                 _exit(1);
 149         }
 150
 151 #if USE_OPENSSL
 152         if (session->ssl_type == SSL_TUNNEL && !ssl_init_socket(sock)) {
 153                 session_send_msg(session, SESSION_MSG_ERROR,
 154                                  "can't initialize SSL.");
 155                 session_close(session);
 156                 _exit(1);
 157         }
 158 #endif
 159
 160         debug_print("session: child: connected\n");
 161
 162         session->sock = sock;
 163         session->state = SESSION_RECV;
 164
 165         if ((str = sock_getline(sock)) == NULL) {
 166                 session_send_msg(session, SESSION_MSG_ERROR,
 167                                  "can't get server response.");
 168                 session_close(session);
 169                 _exit(1);
 170         }
 171         strretchomp(str);
 172         session_send_msg(session, SESSION_MSG_NORMAL, str);
 173         g_free(str);
 174
 175         while (session_child_input(session) == TRUE)
 176                 ;
 177
 178         session_close(session);
 179
 180         debug_print("session: child: disconnected\n");
 181
 182         _exit(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         debug_print("session: %s: session_disconnect()\n",
 195                     session->child_pid == 0 ? "child" : "parent");
 196         session_send_msg(session, SESSION_MSG_CONTROL, "DISCONNECT");
 197         return 0;
 198 }
 199
 200 /*!
 201  *\brief        parent ?
 202  *
 203  *\param        session Contains session information
 204  */
 205 void session_destroy(Session *session)
 206 {
 207         g_return_if_fail(session != NULL);
 208         g_return_if_fail(session->destroy != NULL);
 209
 210         debug_print("session: session_destroy()\n");
 211         session_close(session);
 212         g_print("$$$ session_destroy() session->destroy called\n");
 213         session->destroy(session);
 214         g_print("$$$ session_destroy() freeing session server\n");
 215         g_free(session->server);
 216         g_print("$$$ session_destroy() freeing session\n");
 217         g_free(session);
 218         g_print("$$$ session_destroy() done\n");
 219 }
 220
 221 void session_set_recv_message_notify(Session *session,
 222                                      RecvMsgNotify notify_func, gpointer data)
 223 {
 224         session->recv_msg_notify = notify_func;
 225         session->recv_msg_notify_data = data;
 226 }
 227
 228 void session_set_recv_data_progressive_notify
 229                                         (Session *session,
 230                                          RecvDataProgressiveNotify notify_func,
 231                                          gpointer data)
 232 {
 233         session->recv_data_progressive_notify = notify_func,
 234         session->recv_data_progressive_notify_data = data;
 235 }
 236
 237 void session_set_recv_data_notify(Session *session, RecvDataNotify notify_func,
 238                                   gpointer data)
 239 {
 240         session->recv_data_notify = notify_func;
 241         session->recv_data_notify_data = data;
 242 }
 243
 244 void session_set_send_data_progressive_notify
 245                                         (Session *session,
 246                                          SendDataProgressiveNotify notify_func,
 247                                          gpointer data)
 248 {
 249         session->send_data_progressive_notify = notify_func;
 250         session->send_data_progressive_notify_data = data;
 251 }
 252
 253 void session_set_send_data_notify(Session *session, SendDataNotify notify_func,
 254                                   gpointer data)
 255 {
 256         session->send_data_notify = notify_func;
 257         session->send_data_notify_data = data;
 258 }
 259
 260 /*!
 261  *\brief        child and parent cleanup (child closes first)
 262  *
 263  *\param        session Contains session information
 264  *
 265  *\return        0 : success
 266  */
 267 static gint session_close(Session *session)
 268 {
 269         g_return_val_if_fail(session != NULL, -1);
 270
 271         debug_print("session: %s: session_close()\n",
 272                     session->child_pid == 0 ? "child" : "parent");
 273
 274         if (session->read_tag > 0) {
 275                 g_source_remove(session->read_tag);
 276                 session->read_tag = 0;
 277         }
 278
 279         g_print("$$$ %s: closing read channel\n", session->child_pid == 0 ? "child" : "parent");
 280         if (session->read_ch) {
 281                 g_io_channel_close(session->read_ch);
 282                 g_io_channel_unref(session->read_ch);
 283                 session->read_ch = NULL;
 284         }
 285
 286         g_print("$$$ %s: closing write channel\n", session->child_pid == 0 ? "child" : "parent");
 287         if (session->write_ch) {
 288                 g_io_channel_close(session->write_ch);
 289                 g_io_channel_unref(session->write_ch);
 290                 session->write_ch = NULL;
 291         }
 292
 293         g_print("$$$ %s: closing socket\n", session->child_pid == 0 ? "child" : "parent");
 294         if (session->sock) {
 295                 sock_close(session->sock);
 296                 session->sock = NULL;
 297                 session->state = SESSION_DISCONNECTED;
 298         }
 299
 300         if (session->child_pid) {
 301                 g_print("$$$ %s: closing child\n", session->child_pid == 0 ? "child" : "parent");
 302                 if (session->state != SESSION_DISCONNECTED)
 303                         kill(session->child_pid, SIGTERM);
 304                 waitpid(session->child_pid, NULL, 0);
 305                 session->child_pid = 0;
 306         }
 307
 308         g_print("$$$ %s: exiting session_close\n", session->child_pid == 0 ? "child" : "parent");
 309         return 0;
 310 }
 311
 312 /*!
 313  *\brief        child and parent: send control message to other process
 314  *
 315  *\param        session Contains session information
 316  *              type Kind of data (commands or message data)
 317  *              msg Data
 318  *
 319  *\return        0 : success
 320  *              -1 : error
 321  */
 322 gint session_send_msg(Session *session, SessionMsgType type, const gchar *msg)
 323 {
 324         gchar *prefix;
 325         gchar *str;
 326         gchar *cur;
 327         guint size;
 328         guint bytes_written;
 329
 330         switch (type) {
 331         case SESSION_MSG_NORMAL:
 332                 prefix = "MESSAGE"; break;
 333         case SESSION_MSG_SEND_DATA:
 334                 prefix = "SENDDATA"; break;
 335         case SESSION_MSG_RECV_DATA:
 336                 prefix = "RECVDATA"; break;
 337         case SESSION_MSG_CONTROL:
 338                 prefix = "CONTROL"; break;
 339         case SESSION_MSG_ERROR:
 340                 prefix = "ERROR"; break;
 341         default:
 342                 return -1;
 343         }
 344
 345         cur = str = g_strdup_printf("%s %s\n", prefix, msg);
 346         size = strlen(str);
 347
 348         while (size > 0) {
 349                 if (g_io_channel_write(session->write_ch, cur, size,
 350                                        &bytes_written)
 351                     != G_IO_ERROR_NONE || bytes_written == 0) {
 352                         g_warning("%s: sending message failed.\n",
 353                                   session->child_pid == 0 ? "child" : "parent");
 354                         g_free(str);
 355                         return -1;
 356                 }
 357                 size -= bytes_written;
 358                 cur += bytes_written;
 359         }
 360
 361         g_free(str);
 362
 363         return 0;
 364 }
 365
 366 /*!
 367  *\brief        child and parent receive function
 368  *
 369  *\param        session Contains session information
 370  *
 371  *\return       Message read by current session
 372  */
 373 static gchar *session_recv_msg(Session *session)
 374 {
 375         gchar buf[BUFFSIZE];
 376         gchar *str = NULL;
 377         guint size = 1;
 378         guint bytes_read;
 379
 380         for (;;) {
 381                 if (g_io_channel_read(session->read_ch, buf, sizeof(buf) - 1,
 382                                       &bytes_read)
 383                     != G_IO_ERROR_NONE || bytes_read == 0) {
 384                         g_warning("%s: receiving message failed.\n",
 385                                   session->child_pid == 0 ? "child" : "parent");
 386                         g_free(str);
 387                         str = NULL;
 388                         break;
 389                 }
 390
 391                 size += bytes_read;
 392                 buf[bytes_read] = '\0';
 393
 394                 if (!str)
 395                         str = g_strdup(buf);
 396                 else {
 397                         str = g_realloc(str, size);
 398                         strcat(str, buf);
 399                 }
 400                 if (str[size - 2] == '\n') {
 401                         str[size - 2] = '\0';
 402
 403                         debug_print("session: %s: received message: %s\n",
 404                                     session->child_pid == 0 ?
 405                                     "child" : "parent", str);
 406
 407                         break;
 408                 }
 409         }
 410
 411         return str;
 412 }
 413
 414 #if USE_OPENSSL
 415 gint session_start_tls(Session *session)
 416 {
 417         gchar *ctl_msg;
 418
 419         session_send_msg(session, SESSION_MSG_CONTROL, "STARTTLS");
 420         ctl_msg = session_recv_msg(session);
 421         if (!ctl_msg || strcmp(ctl_msg, "CONTROL STARTTLSOK") != 0) {
 422                 g_free(ctl_msg);
 423                 return -1;
 424         }
 425         g_free(ctl_msg);
 426
 427         return 0;
 428 }
 429 #endif
 430
 431 /*!
 432  *\brief        parent (child?): send data to other process
 433  *
 434  *\param        session Contains session information
 435  *              data Data to send
 436  *              size Bytes to send
 437  *
 438  *\return        0 : success
 439  *              -1 : error
 440  */
 441 gint session_send_data(Session *session, const guchar *data, guint size)
 442 {
 443         gchar *msg;
 444         const guchar *cur = data;
 445         guint bytes_written;
 446         GIOError err;
 447
 448         session_send_msg(session, SESSION_MSG_SEND_DATA, itos(size));
 449         if ((msg = session_recv_msg(session)) == NULL)
 450                 return -1;
 451         g_free(msg);
 452
 453         while (size > 0) {
 454                 if ((err = g_io_channel_write(session->write_ch, (guchar *)cur,
 455                                               size, &bytes_written))
 456                     != G_IO_ERROR_NONE || bytes_written == 0) {
 457                         g_warning("%s: sending data failed: %d\n",
 458                                   session->child_pid == 0 ? "child" : "parent",
 459                                   err);
 460                         return -1;
 461                 }
 462                 size -= bytes_written;
 463                 cur += bytes_written;
 464                 debug_print("session: %s: sent %d bytes of data\n",
 465                             session->child_pid == 0 ? "child" : "parent",
 466                             bytes_written);
 467         }
 468
 469         return 0;
 470 }
 471
 472 gint session_recv_data(Session *session, guint size, gboolean unescape_dot)
 473 {
 474         if (unescape_dot) {
 475                 gchar buf[BUFFSIZE];
 476
 477                 g_snprintf(buf, sizeof(buf), "%d UNESCAPE", size);
 478                 session_send_msg(session, SESSION_MSG_RECV_DATA, buf);
 479         } else
 480                 session_send_msg(session, SESSION_MSG_RECV_DATA, itos(size));
 481         return 0;
 482 }
 483
 484 /*!
 485  *\brief        child (parent?): read data from other process
 486  *
 487  *\param        session Contains session information
 488  *              size Bytes to read
 489  *
 490  *\return       data read from session
 491  */
 492 static guchar *session_read_data(Session *session, guint size)
 493 {
 494         guchar *data;
 495         guchar *cur;
 496         guint bytes_read;
 497         GIOError err;
 498
 499         cur = data = g_malloc(size);
 500
 501         while (size > 0) {
 502                 if ((err = g_io_channel_read(session->read_ch, cur, size,
 503                                              &bytes_read))
 504                     != G_IO_ERROR_NONE || bytes_read == 0) {
 505                         g_warning("%s: reading data failed: %d\n",
 506                                   session->child_pid == 0 ? "child" : "parent",
 507                                   err);
 508                         g_free(data);
 509                         return NULL;
 510                 }
 511                 size -= bytes_read;
 512                 cur += bytes_read;
 513                 debug_print("session: %s: received %d bytes of data\n",
 514                             session->child_pid == 0 ? "child" : "parent",
 515                             bytes_read);
 516         }
 517
 518         return data;
 519 }
 520
 521 #define MAX_CHUNK_SIZE 4096
 522
 523 /*!
 524  *\brief        child: Send session data to server
 525  *
 526  *\param        session Contains session information
 527  *              data Data to send to server
 528  *              size Bytes to send
 529  *
 530  *\return        0 : success
 531  *              -1 : error
 532  */
 533 static gint session_send_data_to_sock(Session *session, const guchar *data,
 534                                       guint size)
 535 {
 536         const guchar *cur = data;
 537         gint bytes_written;
 538         gint total_write_len = 0;
 539         guint left = size;
 540         gchar buf[BUFFSIZE];
 541         gchar *msg;
 542         struct timeval tv_prev, tv_cur;
 543
 544         gettimeofday(&tv_prev, NULL);
 545
 546         while (1) {
 547                 bytes_written = sock_write(session->sock, cur,
 548                                            MIN(left, MAX_CHUNK_SIZE));
 549                 if (bytes_written <= 0)
 550                         return -1;
 551                 left -= bytes_written;
 552                 cur += bytes_written;
 553                 total_write_len += bytes_written;
 554                 if (left == 0)
 555                         break;
 556
 557                 gettimeofday(&tv_cur, NULL);
 558                 if (tv_cur.tv_sec - tv_prev.tv_sec > 0 ||
 559                     tv_cur.tv_usec - tv_prev.tv_usec > UI_REFRESH_INTERVAL) {
 560                         g_snprintf(buf, sizeof(buf), "DATASENDINPROG %d %d",
 561                                    total_write_len, size);
 562                         session_send_msg(session, SESSION_MSG_CONTROL, buf);
 563                         if ((msg = session_recv_msg(session)) == NULL)
 564                                 return -1;
 565                         g_free(msg);
 566                         gettimeofday(&tv_prev, NULL);
 567                 }
 568         }
 569
 570         return 0;
 571 }
 572
 573 /*!
 574  *\brief        child: Read answer/data from server
 575  *
 576  *\param        session Contains session information
 577  *              size Max bytes to receive
 578  *
 579  *\return       Server answer
 580  */
 581 static guchar *session_recv_data_from_sock(Session *session, guint size)
 582 {
 583         guchar *data;
 584         guchar *cur;
 585         gint bytes_read;
 586         gint total_read_len = 0;
 587         guint left = size;
 588         gchar buf[BUFFSIZE];
 589         gchar *msg;
 590         struct timeval tv_prev, tv_cur;
 591
 592         gettimeofday(&tv_prev, NULL);
 593
 594         cur = data = g_malloc(size);
 595
 596         while (1) {
 597                 bytes_read = sock_read(session->sock, cur, left);
 598                 if (bytes_read <= 0) {
 599                         g_free(data);
 600                         return NULL;
 601                 }
 602                 debug_print("session: child: "
 603                             "received %d bytes of data from sock\n",
 604                             bytes_read);
 605                 left -= bytes_read;
 606                 cur += bytes_read;
 607                 total_read_len += bytes_read;
 608                 if (left == 0)
 609                         break;
 610
 611                 gettimeofday(&tv_cur, NULL);
 612                 if (tv_cur.tv_sec - tv_prev.tv_sec > 0 ||
 613                     tv_cur.tv_usec - tv_prev.tv_usec > UI_REFRESH_INTERVAL) {
 614                         g_snprintf(buf, sizeof(buf), "DATARECVINPROG %d %d",
 615                                    total_read_len, size);
 616                         session_send_msg(session, SESSION_MSG_CONTROL, buf);
 617                         if ((msg = session_recv_msg(session)) == NULL) {
 618                                 g_free(data);
 619                                 return NULL;
 620                         }
 621                         g_free(msg);
 622                         gettimeofday(&tv_prev, NULL);
 623                 }
 624         }
 625
 626         return data;
 627 }
 628
 629 static guchar *session_recv_data_from_sock_unescape(Session *session,
 630                                                     guint size,
 631                                                     guint *actual_size)
 632 {
 633         GString *data;
 634         guchar *ret_data;
 635         gint bytes_read;
 636         gchar buf[BUFFSIZE];
 637         gchar *msg;
 638         struct timeval tv_prev, tv_cur;
 639
 640         gettimeofday(&tv_prev, NULL);
 641
 642         data = g_string_sized_new(size + 1);
 643         *actual_size = 0;
 644
 645         while (1) {
 646                 bytes_read = sock_gets(session->sock, buf, sizeof(buf));
 647                 if (bytes_read <= 0) {
 648                         g_string_free(data, TRUE);
 649                         return NULL;
 650                 }
 651
 652                 if (buf[0] == '.' && buf[1] == '\r' && buf[2] == '\n')
 653                         break;
 654                 if (buf[0] == '.' && buf[1] == '.')
 655                         g_string_append(data, buf + 1);
 656                 else
 657                         g_string_append(data, buf);
 658
 659                 gettimeofday(&tv_cur, NULL);
 660                 if (tv_cur.tv_sec - tv_prev.tv_sec > 0 ||
 661                     tv_cur.tv_usec - tv_prev.tv_usec > UI_REFRESH_INTERVAL) {
 662                         g_snprintf(buf, sizeof(buf), "DATARECVINPROG %d %d",
 663                                    data->len, MAX(data->len, size));
 664                         session_send_msg(session, SESSION_MSG_CONTROL, buf);
 665                         if ((msg = session_recv_msg(session)) == NULL) {
 666                                 g_string_free(data, TRUE);
 667                                 return NULL;
 668                         }
 669                         g_free(msg);
 670                         gettimeofday(&tv_prev, NULL);
 671                 }
 672         }
 673
 674         ret_data = data->str;
 675         *actual_size = data->len;
 676         g_string_free(data, FALSE);
 677
 678         return ret_data;
 679 }
 680
 681 /*!
 682  *\brief        Return if message is an internal command or server data
 683  *
 684  *\param        str Message to analyze
 685  *
 686  *\return       Type of message
 687  */
 688 static SessionMsgType session_get_msg_type(const gchar *str)
 689 {
 690         if (!strncmp(str, "MESSAGE ", 8))
 691                 return SESSION_MSG_NORMAL;
 692         else if (!strncmp(str, "SENDDATA ", 9))
 693                 return SESSION_MSG_SEND_DATA;
 694         else if (!strncmp(str, "RECVDATA ", 9))
 695                 return SESSION_MSG_RECV_DATA;
 696         else if (!strncmp(str, "CONTROL ", 8))
 697                 return SESSION_MSG_CONTROL;
 698         else if (!strncmp(str, "ERROR ", 6))
 699                 return SESSION_MSG_ERROR;
 700         else
 701                 return SESSION_MSG_UNKNOWN;
 702 }
 703
 704 /*!
 705  *\brief        parent: Received data from child
 706  *
 707  *\param        source Channel watching child pipe
 708  *              condition Unused (IN, HUP, OUT)
 709  *              data Contains session information
 710  *
 711  *\return       FALSE to remove watching channel
 712  */
 713 gboolean session_parent_input_cb(GIOChannel *source, GIOCondition condition,
 714                                  gpointer data)
 715 {
 716         Session *session = SESSION(data);
 717         gchar *msg;
 718         gchar *msg_data;
 719         gint len;
 720         gint total;
 721         guchar *recv_data;
 722         guint size;
 723         gint ret;
 724
 725         if ((msg = session_recv_msg(session)) == NULL) {
 726                 session->state = SESSION_ERROR;
 727                 return FALSE;
 728         }
 729
 730         switch (session_get_msg_type(msg)) {
 731         case SESSION_MSG_NORMAL:
 732                 msg_data = msg + strlen("MESSAGE ");
 733                 ret = session->recv_msg(session, msg_data);
 734                 g_print("$$$ > session_parent_input_cb(data: %lx)\n",
 735                         session->recv_msg_notify_data);
 736                 session->recv_msg_notify(session, msg_data,
 737                                          session->recv_msg_notify_data);
 738                 g_print("$$$ < session_parent_input_cb(data: %lx)\n",
 739                         session->recv_msg_notify_data);
 740                 if (ret > 0)
 741                         session_send_msg(session, SESSION_MSG_CONTROL,
 742                                          "CONTINUE");
 743                 else if (ret < 0) {
 744                         session->state = SESSION_ERROR;
 745                         g_free(msg);
 746                         return FALSE;
 747                 }
 748                 break;
 749         case SESSION_MSG_SEND_DATA:
 750                 msg_data = msg + strlen("SENDDATA ");
 751                 size = atoi(msg_data);
 752                 session_send_msg(session, SESSION_MSG_CONTROL, "ACCEPTDATA");
 753                 recv_data = session_read_data(session, size);
 754                 if (!recv_data) {
 755                         session->state = SESSION_ERROR;
 756                         g_free(msg);
 757                         return FALSE;
 758                 }
 759                 ret = session->recv_data_finished(session, recv_data, size);
 760                 g_free(recv_data);
 761                 session->recv_data_notify(session, size,
 762                                           session->recv_data_notify_data);
 763                 if (ret > 0)
 764                         session_send_msg(session, SESSION_MSG_CONTROL,
 765                                          "CONTINUE");
 766                 else if (ret < 0) {
 767                         session->state = SESSION_ERROR;
 768                         g_free(msg);
 769                         return FALSE;
 770                 }
 771                 break;
 772         case SESSION_MSG_RECV_DATA:
 773                 break;
 774         case SESSION_MSG_CONTROL:
 775                 msg_data = msg + strlen("CONTROL ");
 776                 if (!strncmp(msg_data, "DATARECVINPROG ", 15)) {
 777                         ret = sscanf(msg_data,
 778                                      "DATARECVINPROG %d %d", &len, &total);
 779                         if (ret != 2) {
 780                                 g_warning("wrong control message: %s\n", msg);
 781                                 session->state = SESSION_ERROR;
 782                                 g_free(msg);
 783                                 return FALSE;
 784                         }
 785                         session_send_msg(session, SESSION_MSG_CONTROL,
 786                                          "CONTINUE");
 787                         session->recv_data_progressive_notify
 788                                 (session, len, total,
 789                                  session->recv_data_progressive_notify_data);
 790                 } else if (!strncmp(msg_data, "DATASENDINPROG ", 15)) {
 791                         ret = sscanf(msg_data,
 792                                      "DATASENDINPROG %d %d", &len, &total);
 793                         if (ret != 2) {
 794                                 g_warning("wrong control message: %s\n", msg);
 795                                 session->state = SESSION_ERROR;
 796                                 g_free(msg);
 797                                 return FALSE;
 798                         }
 799                         session_send_msg(session, SESSION_MSG_CONTROL,
 800                                          "CONTINUE");
 801                         session->send_data_progressive_notify
 802                                 (session, len, total,
 803                                  session->send_data_progressive_notify_data);
 804                 } else if (!strncmp(msg_data, "DATASENT ", 9)) {
 805                         len = atoi(msg_data + 9);
 806                         ret = session->send_data_finished(session, len);
 807                         session->send_data_notify
 808                                 (session, len, session->send_data_notify_data);
 809                 } else if (!strcmp(msg_data, "DISCONNECTED")) {
 810                         session->state = SESSION_DISCONNECTED;
 811                         g_free(msg);
 812                         return FALSE;
 813                 } else {
 814                         g_warning("wrong control message: %s\n", msg);
 815                         session->state = SESSION_ERROR;
 816                         g_free(msg);
 817                         return FALSE;
 818                 }
 819                 break;
 820         case SESSION_MSG_ERROR:
 821         default:
 822                 g_warning("error from child: %s\n", msg + strlen("ERROR "));
 823                 session->state = SESSION_ERROR;
 824                 g_free(msg);
 825                 return FALSE;
 826         }
 827
 828         g_free(msg);
 829         return TRUE;
 830 }
 831
 832 /*!
 833  *\brief        child: Receive control message from parent,
 834  *              transfer data from/to server
 835  *
 836  *\param        session Contains session information
 837  *
 838  *\return       TRUE if more data is available
 839  */
 840 gboolean session_child_input(Session *session)
 841 {
 842         gchar buf[BUFFSIZE];
 843         gchar *msg;
 844         gchar *msg_data;
 845         gchar *str;
 846         guchar *send_data;
 847         guchar *recv_data;
 848         guint size;
 849         guint actual_size;
 850
 851         if ((msg = session_recv_msg(session)) == NULL) {
 852                 session_send_msg(session, SESSION_MSG_ERROR,
 853                                  "receiving message failed.");
 854                 session->state = SESSION_ERROR;
 855                 return FALSE;
 856         }
 857
 858         switch (session_get_msg_type(msg)) {
 859         case SESSION_MSG_NORMAL:
 860                 msg_data = msg + strlen("MESSAGE ");
 861                 session->state = SESSION_SEND;
 862                 sock_puts(session->sock, msg_data);
 863                 session->state = SESSION_RECV;
 864                 str = sock_getline(session->sock);
 865                 if (!str) {
 866                         session_send_msg(session, SESSION_MSG_ERROR,
 867                                          "receiving message failed.");
 868                         session->state = SESSION_ERROR;
 869                         g_free(msg);
 870                         return FALSE;
 871                 }
 872                 strretchomp(str);
 873                 session_send_msg(session, SESSION_MSG_NORMAL, str);
 874                 g_free(str);
 875                 break;
 876         case SESSION_MSG_SEND_DATA:
 877                 msg_data = msg + strlen("SENDDATA ");
 878                 size = atoi(msg_data);
 879                 session_send_msg(session, SESSION_MSG_CONTROL, "ACCEPTDATA");
 880                 send_data = session_read_data(session, size);
 881                 if (!send_data) {
 882                         session_send_msg(session, SESSION_MSG_ERROR,
 883                                          "sending data failed.");
 884                         session->state = SESSION_ERROR;
 885                         g_free(msg);
 886                         return FALSE;
 887                 }
 888                 session->state = SESSION_SEND;
 889                 if (session_send_data_to_sock(session, send_data, size) < 0) {
 890                         session_send_msg(session, SESSION_MSG_ERROR,
 891                                          "sending data failed.");
 892                         session->state = SESSION_ERROR;
 893                         g_free(send_data);
 894                         g_free(msg);
 895                         return FALSE;
 896                 }
 897                 g_free(send_data);
 898                 g_snprintf(buf, sizeof(buf), "DATASENT %d", size);
 899                 session_send_msg(session, SESSION_MSG_CONTROL, buf);
 900                 break;
 901         case SESSION_MSG_RECV_DATA:
 902                 msg_data = msg + strlen("RECVDATA ");
 903                 size = atoi(msg_data);
 904                 session->state = SESSION_RECV;
 905                 if (strstr(msg_data, "UNESCAPE") != NULL) {
 906                         recv_data = session_recv_data_from_sock_unescape
 907                                 (session, size, &actual_size);
 908                         size = actual_size;
 909                 } else
 910                         recv_data = session_recv_data_from_sock(session, size);
 911                 if (!recv_data) {
 912                         session_send_msg(session, SESSION_MSG_ERROR,
 913                                          "receiving data failed.");
 914                         session->state = SESSION_ERROR;
 915                         g_free(msg);
 916                         return FALSE;
 917                 }
 918                 if (session_send_data(session, recv_data, size) < 0) {
 919                         session->state = SESSION_ERROR;
 920                         g_free(recv_data);
 921                         g_free(msg);
 922                         return FALSE;
 923                 }
 924                 g_free(recv_data);
 925                 break;
 926         case SESSION_MSG_CONTROL:
 927                 msg_data = msg + strlen("CONTROL ");
 928                 if (!strcmp(msg_data, "CONTINUE")) {
 929                         session->state = SESSION_RECV;
 930                         str = sock_getline(session->sock);
 931                         if (!str) {
 932                                 session_send_msg(session, SESSION_MSG_ERROR,
 933                                                  "receiving message failed.");
 934                                 session->state = SESSION_ERROR;
 935                                 g_free(msg);
 936                                 return FALSE;
 937                         }
 938                         strretchomp(str);
 939                         session_send_msg(session, SESSION_MSG_NORMAL, str);
 940                         g_free(str);
 941                         break;
 942 #if USE_OPENSSL
 943                 } else if (!strcmp(msg_data, "STARTTLS")) {
 944                         if (!ssl_init_socket_with_method(session->sock,
 945                                                          SSL_METHOD_TLSv1)) {
 946                                 session_send_msg(session, SESSION_MSG_ERROR,
 947                                                  "can't start TLS session.");
 948                                 session->state = SESSION_ERROR;
 949                                 g_free(msg);
 950                                 return FALSE;
 951                         }
 952                         session_send_msg(session, SESSION_MSG_CONTROL,
 953                                          "STARTTLSOK");
 954                         break;
 955 #endif
 956                 } else if (!strcmp(msg_data, "DISCONNECT")) {
 957                         sock_close(session->sock);
 958                         session->sock = NULL;
 959                         session->state = SESSION_DISCONNECTED;
 960                         session_send_msg(session, SESSION_MSG_CONTROL,
 961                                          "DISCONNECTED");
 962                         g_free(msg);
 963                         return FALSE;
 964                 } else {
 965                         session_send_msg(session, SESSION_MSG_ERROR,
 966                                          "wrong control message.");
 967                         session->state = SESSION_ERROR;
 968                         g_free(msg);
 969                         return FALSE;
 970                 }
 971                 break;
 972         case SESSION_MSG_ERROR:
 973         default:
 974                 session_send_msg(session, SESSION_MSG_ERROR,
 975                                  "error received from parent.");
 976                 session->state = SESSION_ERROR;
 977                 g_free(msg);
 978                 return FALSE;
 979         }
 980
 981         g_free(msg);
 982         return TRUE;
 983 }