/* send formatted data with \r and \n translation in addition to IAC IAC */
int telnet_vprintf(telnet_t *telnet, const char *fmt, va_list va) {
static const char CRLF[] = { '\r', '\n' };
static const char CRNUL[] = { '\r', '\0' };
char buffer[1024];
char *output = buffer;
int rs, i, l;
/* format */
va_list va2;
va_copy(va2, va);
rs = vsnprintf(buffer, sizeof(buffer), fmt, va);
if (rs >= sizeof(buffer)) {
output = (char*)malloc(rs + 1);
if (output == 0) {
_error(telnet, __LINE__, __func__, TELNET_ENOMEM, 0,
"malloc() failed: %s", strerror(errno));
return -1;
}
rs = vsnprintf(output, rs + 1, fmt, va2);
}
va_end(va2);
va_end(va);
/* send */
for (l = i = 0; i != rs; ++i) {
/* special characters */
if (output[i] == (char)TELNET_IAC || output[i] == '\r' ||
output[i] == '\n') {
/* dump prior portion of text */
if (i != l)
_send(telnet, output + l, i - l);
l = i + 1;
/* IAC -> IAC IAC */
if (output[i] == (char)TELNET_IAC)
telnet_iac(telnet, TELNET_IAC);
/* automatic translation of \r -> CRNUL */
else if (output[i] == '\r')
_send(telnet, CRNUL, 2);
/* automatic translation of \n -> CRLF */
else if (output[i] == '\n')
_send(telnet, CRLF, 2);
}
}
/* send whatever portion of output is left */
if (i != l) {
_send(telnet, output + l, i - l);
}
/* free allocated memory, if any */
if (output != buffer) {
free(output);
}
return rs;
}
int guac_telnet_user_key_handler(guac_user* user, int keysym, int pressed) {
guac_client* client = user->client;
guac_telnet_client* telnet_client = (guac_telnet_client*) client->data;
guac_telnet_settings* settings = telnet_client->settings;
guac_terminal* term = telnet_client->term;
/* Skip if terminal not yet ready */
if (term == NULL)
return 0;
/* Stop searching for password */
if (settings->password_regex != NULL) {
guac_client_log(client, GUAC_LOG_DEBUG,
"Stopping password prompt search due to user input.");
regfree(settings->password_regex);
free(settings->password_regex);
settings->password_regex = NULL;
}
/* Stop searching for username */
if (settings->username_regex != NULL) {
guac_client_log(client, GUAC_LOG_DEBUG,
"Stopping username prompt search due to user input.");
regfree(settings->username_regex);
free(settings->username_regex);
settings->username_regex = NULL;
}
/* Intercept and handle Pause / Break / Ctrl+0 as "IAC BRK" */
if (pressed && (
keysym == 0xFF13 /* Pause */
|| keysym == 0xFF6B /* Break */
|| (term->mod_ctrl && keysym == '0') /* Ctrl + 0 */
)) {
/* Send IAC BRK */
telnet_iac(telnet_client->telnet, TELNET_BREAK);
return 0;
}
/* Send key */
guac_terminal_send_key(term, keysym, pressed);
return 0;
}
/* send formatted data with \r and \n translation in addition to IAC IAC */
int telnet_printf(telnet_t *telnet, const char *fmt, ...) {
static const char CRLF[] = { '\r', '\n' };
static const char CRNUL[] = { '\r', '\0' };
char buffer[4096];
va_list va;
int rs, i, l;
/* format */
va_start(va, fmt);
rs = vsnprintf(buffer, sizeof(buffer), fmt, va);
va_end(va);
/* send */
for (l = i = 0; i != rs; ++i) {
/* special characters */
if (buffer[i] == (char)TELNET_IAC || buffer[i] == '\r' || buffer[i] == '\n') {
/* dump prior portion of text */
if (i != l)
_send(telnet, buffer + l, i - l);
l = i + 1;
/* IAC -> IAC IAC */
if (buffer[i] == (char)TELNET_IAC)
telnet_iac(telnet, TELNET_IAC);
/* automatic translation of \r -> CRNUL */
else if (buffer[i] == '\r')
_send(telnet, CRNUL, 2);
/* automatic translation of \n -> CRLF */
else if (buffer[i] == '\n')
_send(telnet, CRLF, 2);
}
}
/* send whatever portion of buffer is left */
if (i != l) {
_send(telnet, buffer + l, i - l);
}
return rs;
}
/* send non-command data (escapes IAC bytes) */
void telnet_send(telnet_t *telnet, const char *buffer,
size_t size) {
size_t i, l;
for (l = i = 0; i != size; ++i) {
/* dump prior portion of text, send escaped bytes */
if (buffer[i] == (char)TELNET_IAC) {
/* dump prior text if any */
if (i != l) {
_send(telnet, buffer + l, i - l);
}
l = i + 1;
/* send escape */
telnet_iac(telnet, TELNET_IAC);
}
}
/* send whatever portion of buffer is left */
if (i != l) {
_send(telnet, buffer + l, i - l);
}
}
