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GUAC-654: Implement simple telnet client. No screen resize yet.

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This commit is contained in:
Michael Jumper 2014-05-07 11:32:19 -07:00
parent 7c08593b83
commit a7d1dde24f
12 changed files with 892 additions and 3 deletions
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5
Makefile.am
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@ -30,6 +30,7 @@ DIST_SUBDIRS = \
src/guacd \
src/protocols/rdp \
src/protocols/ssh \
src/protocols/telnet \
src/protocols/vnc \
tests
@ -51,6 +52,10 @@ if ENABLE_SSH
SUBDIRS += src/protocols/ssh
endif
if ENABLE_TELNET
SUBDIRS += src/protocols/telnet
endif
if ENABLE_VNC
SUBDIRS += src/protocols/vnc
endif

21
configure.ac
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@ -609,6 +609,23 @@ AM_CONDITIONAL([ENABLE_SSH_AGENT],
[test "x${have_ssh_agent}" = "xyes" \
-a "x${enable_ssh_agent}" = "xyes"])
#
# libtelnet
#
have_libtelnet=yes
SSH_LIBS=
AC_CHECK_LIB([telnet], [telnet_init],
[TELNET_LIBS="$TELNET_LIBS -ltelnet"],
[have_libtelnet=no])
AM_CONDITIONAL([ENABLE_TELNET], [test "x${have_libtelnet}" = "xyes" \
-a "x${have_terminal}" = "xyes" \
-a "x${have_ssl}" = "xyes"])
AC_SUBST(TELNET_LIBS)
AC_CONFIG_FILES([Makefile
tests/Makefile
src/common/Makefile
@ -617,11 +634,13 @@ AC_CONFIG_FILES([Makefile
src/guacd/Makefile
src/protocols/rdp/Makefile
src/protocols/ssh/Makefile
src/protocols/telnet/Makefile
src/protocols/vnc/Makefile])
AC_OUTPUT
AM_COND_IF([ENABLE_RDP], [build_rdp=yes], [build_rdp=no])
AM_COND_IF([ENABLE_SSH], [build_ssh=yes], [build_ssh=no])
AM_COND_IF([ENABLE_TELNET], [build_telnet=yes], [build_telnet=no])
AM_COND_IF([ENABLE_VNC], [build_vnc=yes], [build_vnc=no])
AM_COND_IF([ENABLE_INIT], [build_init="${init_dir}"], [build_init=no])
@ -637,6 +656,7 @@ $PACKAGE_NAME version $PACKAGE_VERSION
pango ............... ${have_pango}
libssh2 ............. ${have_libssh2}
libssl .............. ${have_ssl}
libtelnet ........... ${have_libtelnet}
libVNCServer ........ ${have_libvncserver}
libvorbis ........... ${have_vorbis}
libpulse ............ ${have_pulse}
@ -645,6 +665,7 @@ $PACKAGE_NAME version $PACKAGE_VERSION
RDP ....... ${build_rdp}
SSH ....... ${build_ssh}
Telnet .... ${build_telnet}
VNC ....... ${build_vnc}
Init scripts: ${build_init}

36
src/protocols/telnet/.gitignore vendored Normal file
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@ -0,0 +1,36 @@
# Object code
*.o
*.so
*.lo
*.la
# Backup files
*~
# Release files
*.tar.gz
# Files currently being edited by vim or vi
*.swp
# automake/autoconf
.deps/
.libs/
Makefile
Makefile.in
aclocal.m4
autom4te.cache/
m4/*
!README
config.guess
config.log
config.status
config.sub
configure
depcomp
install-sh
libtool
ltmain.sh
missing

44
src/protocols/telnet/Makefile.am Normal file
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@ -0,0 +1,44 @@
#
# Copyright (C) 2014 Glyptodon LLC
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
AUTOMAKE_OPTIONS = foreign
ACLOCAL_AMFLAGS = -I m4
lib_LTLIBRARIES = libguac-client-telnet.la
libguac_client_telnet_la_SOURCES = \
client.c \
clipboard.c \
guac_handlers.c \
telnet_client.c
noinst_HEADERS = \
client.h \
clipboard.h \
guac_handlers.h \
telnet_client.h
libguac_client_telnet_la_CFLAGS = -Werror -Wall -Iinclude @LIBGUAC_INCLUDE@ @TERMINAL_INCLUDE@
libguac_client_telnet_la_LIBADD = @LIBGUAC_LTLIB@ @TERMINAL_LTLIB@
libguac_client_telnet_la_LDFLAGS = -version-info 0:0:0 @TELNET_LIBS@ @PTHREAD_LIBS@

150
src/protocols/telnet/client.c Normal file
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@ -0,0 +1,150 @@
/*
* Copyright (C) 2013 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "config.h"
#include "client.h"
#include "clipboard.h"
#include "guac_handlers.h"
#include "telnet_client.h"
#include "terminal.h"
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <guacamole/client.h>
#include <guacamole/protocol.h>
#include <guacamole/socket.h>
#define GUAC_TELNET_DEFAULT_FONT_NAME "monospace"
#define GUAC_TELNET_DEFAULT_FONT_SIZE 12
#define GUAC_TELNET_DEFAULT_PORT "23"
/* Client plugin arguments */
const char* GUAC_CLIENT_ARGS[] = {
"hostname",
"port",
"font-name",
"font-size",
NULL
};
enum __TELNET_ARGS_IDX {
/**
* The hostname to connect to. Required.
*/
IDX_HOSTNAME,
/**
* The port to connect to. Optional.
*/
IDX_PORT,
/**
* The name of the font to use within the terminal.
*/
IDX_FONT_NAME,
/**
* The size of the font to use within the terminal, in points.
*/
IDX_FONT_SIZE,
TELNET_ARGS_COUNT
};
int guac_client_init(guac_client* client, int argc, char** argv) {
guac_socket* socket = client->socket;
telnet_client_data* client_data = malloc(sizeof(telnet_client_data));
/* Init client data */
client->data = client_data;
client_data->telnet = NULL;
client_data->socket_fd = -1;
if (argc != TELNET_ARGS_COUNT) {
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Wrong number of arguments");
return -1;
}
/* Read parameters */
strcpy(client_data->hostname, argv[IDX_HOSTNAME]);
/* Read port */
if (argv[IDX_PORT][0] != 0)
strcpy(client_data->port, argv[IDX_PORT]);
else
strcpy(client_data->port, GUAC_TELNET_DEFAULT_PORT);
/* Read font name */
if (argv[IDX_FONT_NAME][0] != 0)
strcpy(client_data->font_name, argv[IDX_FONT_NAME]);
else
strcpy(client_data->font_name, GUAC_TELNET_DEFAULT_FONT_NAME );
/* Read font size */
if (argv[IDX_FONT_SIZE][0] != 0)
client_data->font_size = atoi(argv[IDX_FONT_SIZE]);
else
client_data->font_size = GUAC_TELNET_DEFAULT_FONT_SIZE;
/* Create terminal */
client_data->term = guac_terminal_create(client,
client_data->font_name, client_data->font_size,
client->info.optimal_resolution,
client->info.optimal_width, client->info.optimal_height);
/* Fail if terminal init failed */
if (client_data->term == NULL) {
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Terminal initialization failed");
return -1;
}
/* Send initial name */
guac_protocol_send_name(socket, client_data->hostname);
guac_socket_flush(socket);
/* Set basic handlers */
client->handle_messages = telnet_guac_client_handle_messages;
client->key_handler = telnet_guac_client_key_handler;
client->mouse_handler = telnet_guac_client_mouse_handler;
client->size_handler = telnet_guac_client_size_handler;
client->free_handler = telnet_guac_client_free_handler;
client->clipboard_handler = guac_telnet_clipboard_handler;
/* Start client thread */
if (pthread_create(&(client_data->client_thread), NULL, telnet_client_thread, (void*) client)) {
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Unable to start telnet client thread");
return -1;
}
/* Success */
return 0;
}

83
src/protocols/telnet/client.h Normal file
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@ -0,0 +1,83 @@
/*
* Copyright (C) 2013 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _TELNET_GUAC_CLIENT_H
#define _TELNET_GUAC_CLIENT_H
#include "config.h"
#include "terminal.h"
#include <pthread.h>
#include <libtelnet.h>
/**
* Telnet-specific client data.
*/
typedef struct telnet_client_data {
/**
* The hostname of the telnet server to connect to.
*/
char hostname[1024];
/**
* The port of the telnet server to connect to.
*/
char port[64];
/**
* The name of the font to use for display rendering.
*/
char font_name[1024];
/**
* The size of the font to use, in points.
*/
int font_size;
/**
* The telnet client thread.
*/
pthread_t client_thread;
/**
* The file descriptor of the socket connected to the telnet server,
* or -1 if no connection has been established.
*/
int socket_fd;
/**
* Telnet connection, used by the telnet client thread.
*/
telnet_t* telnet;
/**
* The terminal which will render all output from the telnet client.
*/
guac_terminal* term;
} telnet_client_data;
#endif

57
src/protocols/telnet/clipboard.c Normal file
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@ -0,0 +1,57 @@
/*
* Copyright (C) 2014 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "config.h"
#include "client.h"
#include "clipboard.h"
int guac_telnet_clipboard_handler(guac_client* client, guac_stream* stream,
char* mimetype) {
/* Clear clipboard and prepare for new data */
telnet_client_data* client_data = (telnet_client_data*) client->data;
guac_terminal_clipboard_reset(client_data->term, mimetype);
/* Set handlers for clipboard stream */
stream->blob_handler = guac_telnet_clipboard_blob_handler;
stream->end_handler = guac_telnet_clipboard_end_handler;
return 0;
}
int guac_telnet_clipboard_blob_handler(guac_client* client, guac_stream* stream,
void* data, int length) {
/* Append new data */
telnet_client_data* client_data = (telnet_client_data*) client->data;
guac_terminal_clipboard_append(client_data->term, data, length);
return 0;
}
int guac_telnet_clipboard_end_handler(guac_client* client, guac_stream* stream) {
/* Nothing to do - clipboard is implemented within client */
return 0;
}

49
src/protocols/telnet/clipboard.h Normal file
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@ -0,0 +1,49 @@
/*
* Copyright (C) 2014 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _GUAC_TELNET_CLIPBOARD_H
#define _GUAC_TELNET_CLIPBOARD_H
#include "config.h"
#include <guacamole/client.h>
#include <guacamole/stream.h>
/**
* Handler for inbound clipboard data.
*/
int guac_telnet_clipboard_handler(guac_client* client, guac_stream* stream,
char* mimetype);
/**
* Handler for stream data related to clipboard.
*/
int guac_telnet_clipboard_blob_handler(guac_client* client, guac_stream* stream,
void* data, int length);
/**
* Handler for end-of-stream related to clipboard.
*/
int guac_telnet_clipboard_end_handler(guac_client* client, guac_stream* stream);
#endif

111
src/protocols/telnet/guac_handlers.c Normal file
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@ -0,0 +1,111 @@
/*
* Copyright (C) 2013 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "config.h"
#include "client.h"
#include "guac_handlers.h"
#include "terminal.h"
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <cairo/cairo.h>
#include <guacamole/socket.h>
#include <guacamole/protocol.h>
#include <guacamole/client.h>
#include <libtelnet.h>
#include <pango/pangocairo.h>
int telnet_guac_client_handle_messages(guac_client* client) {
telnet_client_data* client_data = (telnet_client_data*) client->data;
return guac_terminal_render_frame(client_data->term);
}
int telnet_guac_client_mouse_handler(guac_client* client, int x, int y, int mask) {
telnet_client_data* client_data = (telnet_client_data*) client->data;
guac_terminal* term = client_data->term;
/* Send mouse event */
guac_terminal_send_mouse(term, x, y, mask);
return 0;
}
int telnet_guac_client_key_handler(guac_client* client, int keysym, int pressed) {
telnet_client_data* client_data = (telnet_client_data*) client->data;
guac_terminal* term = client_data->term;
/* Send key */
guac_terminal_send_key(term, keysym, pressed);
return 0;
}
int telnet_guac_client_size_handler(guac_client* client, int width, int height) {
/* STUB */
#if 0
/* Get terminal */
telnet_client_data* guac_client_data = (telnet_client_data*) client->data;
guac_terminal* terminal = guac_client_data->term;
/* Resize terminal */
guac_terminal_resize(terminal, width, height);
/* Update SSH pty size if connected */
if (guac_client_data->term_channel != NULL)
libssh2_channel_request_pty_size(guac_client_data->term_channel,
terminal->term_width, terminal->term_height);
#endif
return 0;
}
int telnet_guac_client_free_handler(guac_client* client) {
telnet_client_data* guac_client_data = (telnet_client_data*) client->data;
/* Close telnet connection */
if (guac_client_data->socket_fd != -1)
close(guac_client_data->socket_fd);
/* Wait for and free telnet session, if connected */
if (guac_client_data->telnet != NULL) {
pthread_join(guac_client_data->client_thread, NULL);
telnet_free(guac_client_data->telnet);
}
guac_terminal_free(guac_client_data->term);
free(client->data);
return 0;
}

38
src/protocols/telnet/guac_handlers.h Normal file
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@ -0,0 +1,38 @@
/*
* Copyright (C) 2014 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _TELNET_GUAC_HANDLERS_H
#define _TELNET_GUAC_HANDLERS_H
#include "config.h"
#include <guacamole/client.h>
int telnet_guac_client_handle_messages(guac_client* client);
int telnet_guac_client_key_handler(guac_client* client, int keysym, int pressed);
int telnet_guac_client_mouse_handler(guac_client* client, int x, int y, int mask);
int telnet_guac_client_size_handler(guac_client* client, int width, int height);
int telnet_guac_client_free_handler(guac_client* client);
#endif

258
src/protocols/telnet/telnet_client.c Normal file
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@ -0,0 +1,258 @@
/*
* Copyright (C) 2013 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "config.h"
#include "client.h"
#include "guac_handlers.h"
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <libtelnet.h>
#include <guacamole/client.h>
#include <guacamole/protocol.h>
#include <guacamole/socket.h>
static const telnet_telopt_t __telnet_options[] = {
{ TELNET_TELOPT_ECHO, TELNET_WONT, TELNET_DONT },
{ TELNET_TELOPT_TTYPE, TELNET_WILL, TELNET_DONT },
{ TELNET_TELOPT_COMPRESS2, TELNET_WONT, TELNET_DO },
{ TELNET_TELOPT_MSSP, TELNET_WONT, TELNET_DO },
{ -1, 0, 0 }
};
static int __write_all(int fd, const char* buffer, int size) {
int remaining = size;
while (remaining > 0) {
/* Attempt to write data */
int ret_val = write(fd, buffer, remaining);
if (ret_val <= 0)
return -1;
/* If successful, contine with what data remains (if any) */
remaining -= ret_val;
buffer += ret_val;
}
return size;
}
static void __guac_telnet_event_handler(telnet_t* telnet, telnet_event_t* event, void* data) {
guac_client* client = (guac_client*) data;
telnet_client_data* client_data = (telnet_client_data*) client->data;
switch (event->type) {
/* User input received */
case TELNET_EV_DATA:
guac_terminal_write_stdout(client_data->term, event->data.buffer, event->data.size);
break;
/* Data destined for remote end */
case TELNET_EV_SEND:
if (__write_all(client_data->socket_fd, event->data.buffer, event->data.size) != event->data.size)
guac_client_stop(client);
break;
/* Terminal type request */
case TELNET_EV_TTYPE:
if (event->ttype.cmd == TELNET_TTYPE_SEND)
telnet_ttype_is(client_data->telnet, "linux");
break;
/* Connection warnings */
case TELNET_EV_WARNING:
guac_client_log_info(client, "%s", event->error.msg);
break;
/* Connection errors */
case TELNET_EV_ERROR:
guac_client_abort(client, GUAC_PROTOCOL_STATUS_UPSTREAM_ERROR,
"Telnet connection closing with error: %s", event->error.msg);
break;
/* Ignore other events */
default:
break;
}
}
void* telnet_input_thread(void* data) {
guac_client* client = (guac_client*) data;
telnet_client_data* client_data = (telnet_client_data*) client->data;
char buffer[8192];
int bytes_read;
/* Write all data read */
while ((bytes_read = guac_terminal_read_stdin(client_data->term, buffer, sizeof(buffer))) > 0)
telnet_send(client_data->telnet, buffer, bytes_read);
return NULL;
}
static telnet_t* __guac_telnet_create_session(guac_client* client) {
int retval;
int fd;
struct addrinfo* addresses;
struct addrinfo* current_address;
char connected_address[1024];
char connected_port[64];
telnet_client_data* client_data = (telnet_client_data*) client->data;
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
.ai_protocol = IPPROTO_TCP
};
/* Get socket */
fd = socket(AF_INET, SOCK_STREAM, 0);
/* Get addresses connection */
if ((retval = getaddrinfo(client_data->hostname, client_data->port,
&hints, &addresses))) {
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Error parsing given address or port: %s",
gai_strerror(retval));
return NULL;
}
/* Attempt connection to each address until success */
current_address = addresses;
while (current_address != NULL) {
int retval;
/* Resolve hostname */
if ((retval = getnameinfo(current_address->ai_addr,
current_address->ai_addrlen,
connected_address, sizeof(connected_address),
connected_port, sizeof(connected_port),
NI_NUMERICHOST | NI_NUMERICSERV)))
guac_client_log_info(client, "Unable to resolve host: %s", gai_strerror(retval));
/* Connect */
if (connect(fd, current_address->ai_addr,
current_address->ai_addrlen) == 0) {
guac_client_log_info(client, "Successfully connected to "
"host %s, port %s", connected_address, connected_port);
/* Done if successful connect */
break;
}
/* Otherwise log information regarding bind failure */
else
guac_client_log_info(client, "Unable to connect to "
"host %s, port %s: %s",
connected_address, connected_port, strerror(errno));
current_address = current_address->ai_next;
}
/* If unable to connect to anything, fail */
if (current_address == NULL) {
guac_client_abort(client, GUAC_PROTOCOL_STATUS_UPSTREAM_ERROR, "Unable to connect to any addresses.");
return NULL;
}
/* Free addrinfo */
freeaddrinfo(addresses);
/* Open telnet session */
telnet_t* telnet = telnet_init(__telnet_options, __guac_telnet_event_handler, 0, client);
if (telnet == NULL) {
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Telnet client allocation failed.");
return NULL;
}
/* Save file descriptor */
client_data->socket_fd = fd;
return telnet;
}
void* telnet_client_thread(void* data) {
guac_client* client = (guac_client*) data;
telnet_client_data* client_data = (telnet_client_data*) client->data;
pthread_t input_thread;
char buffer[8192];
int bytes_read;
/* Open telnet session */
client_data->telnet = __guac_telnet_create_session(client);
if (client_data->telnet == NULL) {
/* Already aborted within __guac_telnet_create_session() */
return NULL;
}
/* Logged in */
guac_client_log_info(client, "Telnet connection successful.");
/* Start input thread */
if (pthread_create(&(input_thread), NULL, telnet_input_thread, (void*) client)) {
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR, "Unable to start input thread");
return NULL;
}
/* While data available, write to terminal */
while ((bytes_read = read(client_data->socket_fd, buffer, sizeof(buffer))) > 0)
telnet_recv(client_data->telnet, buffer, bytes_read);
/* Kill client and Wait for input thread to die */
guac_client_stop(client);
pthread_join(input_thread, NULL);
guac_client_log_info(client, "Telnet connection ended.");
return NULL;
}

37
src/protocols/telnet/telnet_client.h Normal file
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@ -0,0 +1,37 @@
/*
* Copyright (C) 2013 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef __TELNET_CLIENT_H
#define __TELNET_CLIENT_H
#include "config.h"
#include <guacamole/client.h>
/**
* Main telnet client thread, handling transfer of telnet output to STDOUT.
*/
void* telnet_client_thread(void* data);
#endif