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/*
* Copyright (C) 2003-2012 Sebastien Helleu <flashcode@flashtux.org>
*
* This file is part of WeeChat, the extensible chat client.
*
* WeeChat is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* WeeChat is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with WeeChat. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* xfer-dcc.c: file transfer via DCC protocol
*/
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <time.h>
#include <netdb.h>
#include <errno.h>
#include "../weechat-plugin.h"
#include "xfer.h"
#include "xfer-config.h"
#include "xfer-file.h"
#include "xfer-network.h"
/*
* xfer_dcc_send_file_child: child process for sending file with DCC protocol
*/
void
xfer_dcc_send_file_child (struct t_xfer *xfer)
{
int num_read, num_sent, blocksize;
static char buffer[XFER_BLOCKSIZE_MAX];
uint32_t ack;
time_t last_sent, new_time, last_second, sent_ok;
unsigned long long sent_last_second;
blocksize = xfer->blocksize;
if (weechat_config_integer (xfer_config_network_speed_limit) > 0)
{
if (blocksize > weechat_config_integer (xfer_config_network_speed_limit) * 1024)
blocksize = weechat_config_integer (xfer_config_network_speed_limit) * 1024;
}
last_sent = time (NULL);
last_second = time (NULL);
sent_ok = 0;
sent_last_second = 0;
while (1)
{
/* read DCC ACK (sent by receiver) */
if (xfer->pos > xfer->ack)
{
/* we should receive ACK for packets sent previously */
while (1)
{
num_read = recv (xfer->sock, (char *) &ack, 4, MSG_PEEK);
if ((num_read < 1) &&
((num_read != -1) || ((errno != EAGAIN) && (errno != EWOULDBLOCK))))
{
xfer_network_write_pipe (xfer, XFER_STATUS_FAILED,
XFER_ERROR_SEND_BLOCK);
return;
}
if (num_read == 4)
{
recv (xfer->sock, (char *) &ack, 4, 0);
xfer->ack = ntohl (ack);
/* DCC send ok? */
if ((xfer->pos >= xfer->size)
&& (xfer->ack >= xfer->size))
{
xfer_network_write_pipe (xfer, XFER_STATUS_DONE,
XFER_NO_ERROR);
return;
}
}
else
break;
}
}
/* send a block to receiver */
if ((xfer->pos < xfer->size) &&
(xfer->fast_send || (xfer->pos <= xfer->ack)))
{
if ((weechat_config_integer (xfer_config_network_speed_limit) > 0)
&& (sent_last_second >= (unsigned long long)weechat_config_integer (xfer_config_network_speed_limit) * 1024))
{
/* we're sending too fast (according to speed limit set by user) */
usleep (100);
}
else
{
lseek (xfer->file, xfer->pos, SEEK_SET);
num_read = read (xfer->file, buffer, blocksize);
if (num_read < 1)
{
xfer_network_write_pipe (xfer, XFER_STATUS_FAILED,
XFER_ERROR_READ_LOCAL);
return;
}
num_sent = send (xfer->sock, buffer, num_read, 0);
if (num_sent < 0)
{
/*
* socket is temporarily not available (receiver can't
* receive amount of data we sent ?!)
*/
if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
usleep (1000);
else
{
xfer_network_write_pipe (xfer, XFER_STATUS_FAILED,
XFER_ERROR_SEND_BLOCK);
return;
}
}
if (num_sent > 0)
{
xfer->pos += (unsigned long long) num_sent;
sent_last_second += (unsigned long long) num_sent;
new_time = time (NULL);
if ((last_sent != new_time)
|| ((sent_ok == 0) && (xfer->pos >= xfer->size)))
{
last_sent = new_time;
xfer_network_write_pipe (xfer, XFER_STATUS_ACTIVE,
XFER_NO_ERROR);
if (xfer->pos >= xfer->size)
sent_ok = new_time;
}
}
}
}
else
usleep (1000);
new_time = time (NULL);
if (new_time > last_second)
{
last_second = new_time;
sent_last_second = 0;
}
/*
* if send if ok since 2 seconds or more, and that no ack was received,
* then consider it's ok
*/
if ((sent_ok != 0) && (new_time > sent_ok + 2))
{
xfer_network_write_pipe (xfer, XFER_STATUS_DONE,
XFER_NO_ERROR);
return;
}
}
}
/*
* xfer_dcc_recv_file_child: child process for receiving file
*/
void
xfer_dcc_recv_file_child (struct t_xfer *xfer)
{
int num_read;
static char buffer[XFER_BLOCKSIZE_MAX];
uint32_t pos;
time_t last_sent, new_time;
unsigned long long bytes_remaining;
/* first connect to sender (blocking) */
if (!weechat_network_connect_to (xfer->proxy, xfer->sock,
xfer->address, xfer->port))
{
xfer_network_write_pipe (xfer, XFER_STATUS_FAILED,
XFER_ERROR_CONNECT_SENDER);
return;
}
/* connection is ok, change DCC status (inform parent process) */
xfer_network_write_pipe (xfer, XFER_STATUS_ACTIVE,
XFER_NO_ERROR);
last_sent = time (NULL);
while (1)
{
bytes_remaining = xfer->size - xfer->pos;
num_read = recv (xfer->sock, buffer,
(bytes_remaining >= sizeof (buffer)) ? sizeof (buffer) : bytes_remaining,
0);
if (num_read == -1)
{
/* socket is temporarily not available (sender is not fast ?!) */
if ((errno == EAGAIN) || (errno == EWOULDBLOCK) || (errno == EINTR))
usleep (1000);
else
{
xfer_network_write_pipe (xfer, XFER_STATUS_FAILED,
XFER_ERROR_RECV_BLOCK);
return;
}
}
else
{
if (num_read == 0)
{
xfer_network_write_pipe (xfer, XFER_STATUS_FAILED,
XFER_ERROR_RECV_BLOCK);
return;
}
if (write (xfer->file, buffer, num_read) == -1)
{
xfer_network_write_pipe (xfer, XFER_STATUS_FAILED,
XFER_ERROR_WRITE_LOCAL);
return;
}
xfer->pos += (unsigned long long) num_read;
pos = htonl (xfer->pos);
/* we don't check return code, not a problem if an ACK send failed */
send (xfer->sock, (char *) &pos, 4, 0);
/* file received ok? */
if (xfer->pos >= xfer->size)
{
xfer_network_write_pipe (xfer, XFER_STATUS_DONE,
XFER_NO_ERROR);
return;
}
new_time = time (NULL);
if (last_sent != new_time)
{
last_sent = new_time;
xfer_network_write_pipe (xfer, XFER_STATUS_ACTIVE,
XFER_NO_ERROR);
}
}
}
}
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