GUAC-748: Add username parameter to telnet. Pass username via NEW-ENVIRONMENT telnet option.

This commit is contained in:
Michael Jumper 2014-06-16 18:07:13 -07:00
parent c56412f69e
commit ad34c254e0
4 changed files with 62 additions and 5 deletions

View File

@ -45,6 +45,7 @@
const char* GUAC_CLIENT_ARGS[] = {
"hostname",
"port",
"username",
"font-name",
"font-size",
NULL
@ -62,6 +63,11 @@ enum __TELNET_ARGS_IDX {
*/
IDX_PORT,
/**
* The name of the user to login as. Optional.
*/
IDX_USERNAME,
/**
* The name of the font to use within the terminal.
*/
@ -100,6 +106,7 @@ int guac_client_init(guac_client* client, int argc, char** argv) {
/* Read parameters */
strcpy(client_data->hostname, argv[IDX_HOSTNAME]);
strcpy(client_data->username, argv[IDX_USERNAME]);
/* Read port */
if (argv[IDX_PORT][0] != 0)

View File

@ -44,6 +44,11 @@ typedef struct guac_telnet_client_data {
*/
char port[64];
/**
* The name of the user to login as.
*/
char username[1024];
/**
* The name of the font to use for display rendering.
*/

View File

@ -44,11 +44,12 @@
* negotiation by telnet_init(), part of libtelnet.
*/
static const telnet_telopt_t __telnet_options[] = {
{ TELNET_TELOPT_ECHO, TELNET_WONT, TELNET_DO },
{ TELNET_TELOPT_TTYPE, TELNET_WILL, TELNET_DONT },
{ TELNET_TELOPT_COMPRESS2, TELNET_WONT, TELNET_DO },
{ TELNET_TELOPT_MSSP, TELNET_WONT, TELNET_DO },
{ TELNET_TELOPT_NAWS, TELNET_WILL, TELNET_DONT },
{ TELNET_TELOPT_ECHO, TELNET_WONT, TELNET_DO },
{ TELNET_TELOPT_TTYPE, TELNET_WILL, TELNET_DONT },
{ TELNET_TELOPT_COMPRESS2, TELNET_WONT, TELNET_DO },
{ TELNET_TELOPT_MSSP, TELNET_WONT, TELNET_DO },
{ TELNET_TELOPT_NAWS, TELNET_WILL, TELNET_DONT },
{ TELNET_TELOPT_NEW_ENVIRON, TELNET_WILL, TELNET_DONT },
{ -1, 0, 0 }
};
@ -132,6 +133,15 @@ static void __guac_telnet_event_handler(telnet_t* telnet, telnet_event_t* event,
telnet_ttype_is(client_data->telnet, "linux");
break;
/* Environment request */
case TELNET_EV_ENVIRON:
/* Only send USER if entire environment was requested */
if (event->environ.size == 0)
guac_telnet_send_user(telnet, client_data->username);
break;
/* Connection warnings */
case TELNET_EV_WARNING:
guac_client_log_info(client, "%s", event->error.msg);
@ -293,6 +303,16 @@ static void __guac_telnet_send_uint16(telnet_t* telnet, uint16_t value) {
}
/**
* Sends an 8-bit value over the given telnet connection.
*
* @param telnet The telnet connection to use.
* @param value The value to send.
*/
static void __guac_telnet_send_uint8(telnet_t* telnet, uint8_t value) {
telnet_send(telnet, (char*) (&value), 1);
}
void guac_telnet_send_naws(telnet_t* telnet, uint16_t width, uint16_t height) {
telnet_begin_sb(telnet, TELNET_TELOPT_NAWS);
__guac_telnet_send_uint16(telnet, width);
@ -300,6 +320,25 @@ void guac_telnet_send_naws(telnet_t* telnet, uint16_t width, uint16_t height) {
telnet_finish_sb(telnet);
}
void guac_telnet_send_user(telnet_t* telnet, const char* username) {
/* IAC SB NEW-ENVIRON IS */
telnet_begin_sb(telnet, TELNET_TELOPT_NEW_ENVIRON);
__guac_telnet_send_uint8(telnet, TELNET_ENVIRON_IS);
/* VAR "USER" */
__guac_telnet_send_uint8(telnet, TELNET_ENVIRON_VAR);
telnet_send(telnet, "USER", 4);
/* VALUE username */
__guac_telnet_send_uint8(telnet, TELNET_ENVIRON_VALUE);
telnet_send(telnet, username, strlen(username));
/* IAC SE */
telnet_finish_sb(telnet);
}
/**
* Waits for data on the given file descriptor for up to one second. The
* return value is identical to that of select(): 0 on timeout, < 0 on

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@ -40,5 +40,11 @@ void* guac_telnet_client_thread(void* data);
*/
void guac_telnet_send_naws(telnet_t* telnet, uint16_t width, uint16_t height);
/**
* Sends the given username by setting the remote USER environment variable
* using the telnet NEW-ENVIRON option.
*/
void guac_telnet_send_user(telnet_t* telnet, const char* username);
#endif