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weechat/src/plugins/xfer/xfer-network.c
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/*
* xfer-network.c - network functions for xfer plugin
*
* Copyright (C) 2003-2016 Sébastien 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/>.
*/
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <signal.h>
#include <time.h>
#include <netdb.h>
#include "../weechat-plugin.h"
#include "xfer.h"
#include "xfer-buffer.h"
#include "xfer-chat.h"
#include "xfer-config.h"
#include "xfer-dcc.h"
#include "xfer-file.h"
/*
* Creates pipe for communication with child process.
*
* Returns:
* 1: OK
* 0: error
*/
int
xfer_network_create_pipe (struct t_xfer *xfer)
{
int child_pipe[2];
if (pipe (child_pipe) < 0)
{
weechat_printf (NULL,
_("%s%s: unable to create pipe: error %d %s"),
weechat_prefix ("error"), XFER_PLUGIN_NAME,
errno, strerror (errno));
xfer_close (xfer, XFER_STATUS_FAILED);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
return 0;
}
xfer->child_read = child_pipe[0];
xfer->child_write = child_pipe[1];
return 1;
}
/*
* Writes data into pipe.
*/
void
xfer_network_write_pipe (struct t_xfer *xfer, int status, int error)
{
char buffer[1 + 1 + 32 + 1]; /* status + error + pos + \0 */
int num_written;
snprintf (buffer, sizeof (buffer), "%c%c%032llu",
status + '0', error + '0', xfer->pos);
num_written = write (xfer->child_write, buffer, sizeof (buffer));
(void) num_written;
}
/*
* Reads data from child via pipe.
*/
int
xfer_network_child_read_cb (const void *pointer, void *data, int fd)
{
struct t_xfer *xfer;
char bufpipe[1 + 1 + 32 + 1];
int num_read;
/* make C compiler happy */
(void) data;
(void) fd;
xfer = (struct t_xfer *)pointer;
num_read = read (xfer->child_read, bufpipe, sizeof (bufpipe));
if (num_read > 0)
{
sscanf (bufpipe + 2, "%llu", &xfer->pos);
xfer->last_activity = time (NULL);
xfer_file_calculate_speed (xfer, 0);
/* read error code */
switch (bufpipe[1] - '0')
{
/* errors for sender */
case XFER_ERROR_READ_LOCAL:
weechat_printf (NULL,
_("%s%s: unable to read local file"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
case XFER_ERROR_SEND_BLOCK:
weechat_printf (NULL,
_("%s%s: unable to send block to receiver"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
case XFER_ERROR_READ_ACK:
weechat_printf (NULL,
_("%s%s: unable to read ACK from receiver"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
/* errors for receiver */
case XFER_ERROR_CONNECT_SENDER:
weechat_printf (NULL,
_("%s%s: unable to connect to sender"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
case XFER_ERROR_RECV_BLOCK:
weechat_printf (NULL,
_("%s%s: unable to receive block from sender"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
case XFER_ERROR_WRITE_LOCAL:
weechat_printf (NULL,
_("%s%s: unable to write local file"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
case XFER_ERROR_SEND_ACK:
weechat_printf (NULL,
_("%s%s: unable to send ACK to sender"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
case XFER_ERROR_HASH_MISMATCH:
weechat_printf (NULL,
_("%s%s: wrong CRC32 for file %s"),
weechat_prefix ("error"), XFER_PLUGIN_NAME,
xfer->filename);
xfer->hash_status = XFER_HASH_STATUS_MISMATCH;
break;
case XFER_ERROR_HASH_RESUME_ERROR:
weechat_printf (NULL,
_("%s%s: CRC32 error while resuming"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
xfer->hash_status = XFER_HASH_STATUS_RESUME_ERROR;
break;
}
/* read new DCC status */
switch (bufpipe[0] - '0')
{
case XFER_STATUS_CONNECTING:
xfer->status = XFER_STATUS_CONNECTING;
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
break;
case XFER_STATUS_ACTIVE:
if (xfer->status == XFER_STATUS_CONNECTING)
{
/* connection was successful by child, init transfer times */
xfer->status = XFER_STATUS_ACTIVE;
xfer->start_transfer = time (NULL);
xfer->last_check_time = time (NULL);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
}
else
xfer_buffer_refresh (WEECHAT_HOTLIST_LOW);
break;
case XFER_STATUS_DONE:
xfer_close (xfer, XFER_STATUS_DONE);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
break;
case XFER_STATUS_FAILED:
xfer_close (xfer, XFER_STATUS_FAILED);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
break;
case XFER_STATUS_HASHING:
xfer->status = XFER_STATUS_HASHING;
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
break;
case XFER_STATUS_HASHED:
if (bufpipe[1] - '0' == XFER_NO_ERROR)
xfer->hash_status = XFER_HASH_STATUS_MATCH;
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
break;
}
}
return WEECHAT_RC_OK;
}
/*
* Forks process for sending file.
*/
void
xfer_network_send_file_fork (struct t_xfer *xfer)
{
pid_t pid;
int rc;
if (!xfer_network_create_pipe (xfer))
return;
xfer->file = open (xfer->local_filename, O_RDONLY | O_NONBLOCK, 0644);
switch (pid = fork ())
{
case -1: /* fork failed */
weechat_printf (NULL,
_("%s%s: unable to fork"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
xfer_close (xfer, XFER_STATUS_FAILED);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
return;
case 0: /* child process */
rc = setuid (getuid ());
(void) rc;
close (xfer->child_read);
switch (xfer->protocol)
{
case XFER_NO_PROTOCOL:
_exit (EXIT_SUCCESS);
break;
case XFER_PROTOCOL_DCC:
xfer_dcc_send_file_child (xfer);
break;
case XFER_NUM_PROTOCOLS:
break;
}
_exit (EXIT_SUCCESS);
}
weechat_printf (NULL,
_("%s: sending file to %s (%s, %s.%s), "
"name: %s (local filename: %s), %llu bytes (protocol: %s)"),
XFER_PLUGIN_NAME,
xfer->remote_nick,
xfer->remote_address_str,
xfer->plugin_name,
xfer->plugin_id,
xfer->filename,
xfer->local_filename,
xfer->size,
xfer_protocol_string[xfer->protocol]);
/* parent process */
xfer->child_pid = pid;
close (xfer->child_write);
xfer->child_write = -1;
xfer->hook_fd = weechat_hook_fd (xfer->child_read,
1, 0, 0,
&xfer_network_child_read_cb,
xfer, NULL);
}
/*
* Forks process for receiving file.
*/
void
xfer_network_recv_file_fork (struct t_xfer *xfer)
{
pid_t pid;
int rc;
if (!xfer_network_create_pipe (xfer))
return;
if (xfer->start_resume > 0)
xfer->file = open (xfer->local_filename,
O_APPEND | O_WRONLY | O_NONBLOCK);
else
xfer->file = open (xfer->local_filename,
O_CREAT | O_TRUNC | O_WRONLY | O_NONBLOCK,
0644);
switch (pid = fork ())
{
case -1: /* fork failed */
weechat_printf (NULL,
_("%s%s: unable to fork"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
xfer_close (xfer, XFER_STATUS_FAILED);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
return;
case 0: /* child process */
rc = setuid (getuid ());
(void) rc;
close (xfer->child_read);
switch (xfer->protocol)
{
case XFER_NO_PROTOCOL:
_exit (EXIT_SUCCESS);
break;
case XFER_PROTOCOL_DCC:
xfer_dcc_recv_file_child (xfer);
break;
case XFER_NUM_PROTOCOLS:
break;
}
_exit (EXIT_SUCCESS);
}
/* parent process */
xfer->child_pid = pid;
close (xfer->child_write);
xfer->child_write = -1;
xfer->hook_fd = weechat_hook_fd (xfer->child_read,
1, 0, 0,
&xfer_network_child_read_cb,
xfer, NULL);
}
/*
* Kills child process and closes pipe.
*/
void
xfer_network_child_kill (struct t_xfer *xfer)
{
/* kill process */
if (xfer->child_pid > 0)
{
kill (xfer->child_pid, SIGKILL);
waitpid (xfer->child_pid, NULL, 0);
xfer->child_pid = 0;
}
/* close pipe used with child */
if (xfer->child_read != -1)
{
close (xfer->child_read);
xfer->child_read = -1;
}
if (xfer->child_write != -1)
{
close (xfer->child_write);
xfer->child_write = -1;
}
}
/*
* Callback called when data is available on xfer socket.
*/
int
xfer_network_fd_cb (const void *pointer, void *data, int fd)
{
struct t_xfer *xfer;
int sock, flags, error;
struct sockaddr_storage addr;
socklen_t length;
char str_address[NI_MAXHOST];
/* make C compiler happy */
(void) data;
(void) fd;
length = sizeof (addr);
memset (&addr, 0, length);
xfer = (struct t_xfer *)pointer;
if (xfer->status == XFER_STATUS_CONNECTING)
{
if (xfer->type == XFER_TYPE_FILE_SEND)
{
xfer->last_activity = time (NULL);
sock = accept (xfer->sock,
(struct sockaddr *) &addr, &length);
error = errno;
weechat_unhook (xfer->hook_fd);
xfer->hook_fd = NULL;
close (xfer->sock);
xfer->sock = -1;
if (sock < 0)
{
weechat_printf (NULL,
_("%s%s: unable to create socket for sending "
"file: error %d %s"),
weechat_prefix ("error"), XFER_PLUGIN_NAME,
error, strerror (error));
xfer_close (xfer, XFER_STATUS_FAILED);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
return WEECHAT_RC_OK;
}
xfer->sock = sock;
flags = fcntl (xfer->sock, F_GETFL);
if (flags == -1)
flags = 0;
if (fcntl (xfer->sock, F_SETFL, flags | O_NONBLOCK) == -1)
{
weechat_printf (NULL,
_("%s%s: unable to set option \"nonblock\" "
"for socket: error %d %s"),
weechat_prefix ("error"), XFER_PLUGIN_NAME,
errno, strerror (errno));
xfer_close (xfer, XFER_STATUS_FAILED);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
return WEECHAT_RC_OK;
}
error = getnameinfo ((struct sockaddr *)&addr, length, str_address,
sizeof (str_address), NULL, 0, NI_NUMERICHOST);
if (error != 0)
{
snprintf (str_address, sizeof (str_address),
"error: %s", gai_strerror (error));
}
xfer_set_remote_address (xfer, (struct sockaddr *)&addr, length,
str_address);
xfer->status = XFER_STATUS_ACTIVE;
xfer->start_transfer = time (NULL);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
xfer_network_send_file_fork (xfer);
}
}
if (xfer->status == XFER_STATUS_WAITING)
{
if (xfer->type == XFER_TYPE_CHAT_SEND)
{
length = sizeof (addr);
sock = accept (xfer->sock, (struct sockaddr *) &addr, &length);
error = errno;
weechat_unhook (xfer->hook_fd);
xfer->hook_fd = NULL;
close (xfer->sock);
xfer->sock = -1;
if (sock < 0)
{
weechat_printf (NULL,
_("%s%s: unable to create socket for sending "
"file: error %d %s"),
weechat_prefix ("error"), XFER_PLUGIN_NAME,
error, strerror (error));
xfer_close (xfer, XFER_STATUS_FAILED);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
return WEECHAT_RC_OK;
}
xfer->sock = sock;
flags = fcntl (xfer->sock, F_GETFL);
if (flags == -1)
flags = 0;
if (fcntl (xfer->sock, F_SETFL, flags | O_NONBLOCK) == -1)
{
weechat_printf (NULL,
_("%s%s: unable to set option \"nonblock\" "
"for socket: error %d %s"),
weechat_prefix ("error"), XFER_PLUGIN_NAME,
errno, strerror (errno));
xfer_close (xfer, XFER_STATUS_FAILED);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
return WEECHAT_RC_OK;
}
error = getnameinfo ((struct sockaddr *)&addr, length, str_address,
sizeof (str_address), NULL, 0, NI_NUMERICHOST);
if (error != 0)
{
snprintf (str_address, sizeof (str_address),
"error: %s", gai_strerror (error));
}
xfer_set_remote_address (xfer, (struct sockaddr *)&addr, length,
str_address);
xfer->status = XFER_STATUS_ACTIVE;
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
xfer->hook_fd = weechat_hook_fd (xfer->sock,
1, 0, 0,
&xfer_chat_recv_cb,
xfer, NULL);
xfer_chat_open_buffer (xfer);
}
}
return WEECHAT_RC_OK;
}
/*
* Callback called to check if there's a timeout for xfer (called only one time
* for xfer).
*/
int
xfer_network_timer_cb (const void *pointer, void *data, int remaining_calls)
{
struct t_xfer *xfer;
/* make C compiler happy */
(void) data;
(void) remaining_calls;
xfer = (struct t_xfer *)pointer;
if ((xfer->status == XFER_STATUS_WAITING)
|| (xfer->status == XFER_STATUS_CONNECTING))
{
weechat_printf (NULL,
_("%s%s: timeout for \"%s\" with %s"),
weechat_prefix ("error"), XFER_PLUGIN_NAME,
xfer->filename, xfer->remote_nick);
xfer_close (xfer, XFER_STATUS_FAILED);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
}
return WEECHAT_RC_OK;
}
/*
* Callback called when connecting to remote host (DCC chat only).
*/
int
xfer_network_connect_chat_recv_cb (const void *pointer, void *data,
int status, int gnutls_rc,
int sock, const char *error,
const char *ip_address)
{
struct t_xfer *xfer;
int flags;
/* make C compiler happy */
(void) data;
(void) gnutls_rc;
(void) ip_address;
xfer = (struct t_xfer*)pointer;
weechat_unhook (xfer->hook_connect);
xfer->hook_connect = NULL;
/* connection OK? */
if (status == WEECHAT_HOOK_CONNECT_OK)
{
xfer->sock = sock;
flags = fcntl (xfer->sock, F_GETFL);
if (flags == -1)
flags = 0;
if (fcntl (xfer->sock, F_SETFL, flags | O_NONBLOCK) == -1)
{
weechat_printf (NULL,
_("%s%s: unable to set option \"nonblock\" "
"for socket: error %d %s"),
weechat_prefix ("error"), XFER_PLUGIN_NAME,
errno, strerror (errno));
close (xfer->sock);
xfer->sock = -1;
xfer_close (xfer, XFER_STATUS_FAILED);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
return WEECHAT_RC_OK;
}
xfer->hook_fd = weechat_hook_fd (xfer->sock,
1, 0, 0,
&xfer_chat_recv_cb,
xfer, NULL);
xfer_chat_open_buffer (xfer);
xfer->status = XFER_STATUS_ACTIVE;
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
return WEECHAT_RC_OK;
}
/* connection error */
switch (status)
{
case WEECHAT_HOOK_CONNECT_ADDRESS_NOT_FOUND:
weechat_printf (NULL,
(xfer->proxy && xfer->proxy[0]) ?
_("%s%s: proxy address \"%s\" not found") :
_("%s%s: address \"%s\" not found"),
weechat_prefix ("error"), XFER_PLUGIN_NAME,
xfer->remote_address_str);
break;
case WEECHAT_HOOK_CONNECT_IP_ADDRESS_NOT_FOUND:
weechat_printf (NULL,
(xfer->proxy && xfer->proxy[0]) ?
_("%s%s: proxy IP address not found") :
_("%s%s: IP address not found"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
case WEECHAT_HOOK_CONNECT_CONNECTION_REFUSED:
weechat_printf (NULL,
(xfer->proxy && xfer->proxy[0]) ?
_("%s%s: proxy connection refused") :
_("%s%s: connection refused"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
case WEECHAT_HOOK_CONNECT_PROXY_ERROR:
weechat_printf (NULL,
_("%s%s: proxy fails to establish connection to "
"server (check username/password if used and if "
"server address/port is allowed by proxy)"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
case WEECHAT_HOOK_CONNECT_LOCAL_HOSTNAME_ERROR:
weechat_printf (NULL,
_("%s%s: unable to set local hostname/IP"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
case WEECHAT_HOOK_CONNECT_MEMORY_ERROR:
weechat_printf (NULL,
_("%s%s: not enough memory (%s)"),
weechat_prefix ("error"), XFER_PLUGIN_NAME,
(error) ? error : "-");
break;
case WEECHAT_HOOK_CONNECT_TIMEOUT:
weechat_printf (NULL,
_("%s%s: timeout"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
case WEECHAT_HOOK_CONNECT_SOCKET_ERROR:
weechat_printf (NULL,
_("%s%s: unable to create socket"),
weechat_prefix ("error"), XFER_PLUGIN_NAME);
break;
default:
weechat_printf (NULL,
_("%s%s: unable to connect: unexpected error (%d)"),
weechat_prefix ("error"), XFER_PLUGIN_NAME,
status);
break;
}
if (error && error[0])
{
weechat_printf (NULL,
_("%s%s: error: %s"),
weechat_prefix ("error"), XFER_PLUGIN_NAME, error);
}
xfer_close (xfer, XFER_STATUS_FAILED);
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
return WEECHAT_RC_OK;
}
/*
* Connects to another host.
*
* Returns:
* 1: OK
* 0: error
*/
int
xfer_network_connect (struct t_xfer *xfer)
{
int flags;
if (xfer->type == XFER_TYPE_CHAT_SEND)
xfer->status = XFER_STATUS_WAITING;
else
xfer->status = XFER_STATUS_CONNECTING;
if (XFER_IS_SEND(xfer->type))
{
/* create socket */
if (xfer->sock < 0)
{
xfer->sock = socket (xfer->local_address->sa_family, SOCK_STREAM,
0);
if (xfer->sock < 0)
return 0;
}
/* listen to socket */
flags = fcntl (xfer->sock, F_GETFL);
if (flags == -1)
flags = 0;
if (fcntl (xfer->sock, F_SETFL, flags | O_NONBLOCK) == -1)
return 0;
if (listen (xfer->sock, 1) == -1)
return 0;
if (fcntl (xfer->sock, F_SETFL, flags) == -1)
return 0;
xfer->hook_fd = weechat_hook_fd (xfer->sock,
1, 0, 0,
&xfer_network_fd_cb,
xfer, NULL);
/* add timeout */
if (weechat_config_integer (xfer_config_network_timeout) > 0)
{
xfer->hook_timer = weechat_hook_timer (weechat_config_integer (xfer_config_network_timeout) * 1000,
0, 1,
&xfer_network_timer_cb,
xfer, NULL);
}
}
/* for chat receiving, connect to listening host */
if (xfer->type == XFER_TYPE_CHAT_RECV)
{
xfer->hook_connect = weechat_hook_connect (xfer->proxy,
xfer->remote_address_str,
xfer->port, 1, 0, NULL, NULL,
0, "NONE", NULL,
&xfer_network_connect_chat_recv_cb,
xfer, NULL);
}
/* for file receiving, connection is made in child process (blocking) */
return 1;
}
/*
* Connects to sender and initializes file or chat.
*/
void
xfer_network_connect_init (struct t_xfer *xfer)
{
if (!xfer_network_connect (xfer))
{
xfer_close (xfer, XFER_STATUS_FAILED);
}
else
{
/* for a file: launch child process */
if (XFER_IS_FILE(xfer->type))
xfer_network_recv_file_fork (xfer);
xfer->status = XFER_STATUS_CONNECTING;
}
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
}
/*
* Accepts a xfer file or chat request.
*/
void
xfer_network_accept (struct t_xfer *xfer)
{
if (XFER_IS_FILE(xfer->type) && (xfer->start_resume > 0))
{
xfer->status = XFER_STATUS_CONNECTING;
xfer_send_signal (xfer, "xfer_resume_ready");
xfer_buffer_refresh (WEECHAT_HOTLIST_MESSAGE);
}
else
xfer_network_connect_init (xfer);
}
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