19 #define RLOGIN_MAX_BACKLOG 4096
21 typedef struct rlogin_tag {
22 const struct plug_function_table *fn;
23 /* the above field _must_ be first in the structure */
26 int closed_on_socket_error;
30 int term_width, term_height;
35 /* In case we need to read a username from the terminal before starting */
39 static void rlogin_size(void *handle, int width, int height);
41 static void c_write(Rlogin rlogin, char *buf, int len)
43 int backlog = from_backend(rlogin->frontend, 0, buf, len);
44 sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);
47 static void rlogin_log(Plug plug, int type, SockAddr addr, int port,
48 const char *error_msg, int error_code)
50 Rlogin rlogin = (Rlogin) plug;
51 char addrbuf[256], *msg;
53 sk_getaddr(addr, addrbuf, lenof(addrbuf));
56 msg = dupprintf("Connecting to %s port %d", addrbuf, port);
58 msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg);
60 logevent(rlogin->frontend, msg);
63 static int rlogin_closing(Plug plug, const char *error_msg, int error_code,
66 Rlogin rlogin = (Rlogin) plug;
69 * We don't implement independent EOF in each direction for Telnet
70 * connections; as soon as we get word that the remote side has
71 * sent us EOF, we wind up the whole connection.
78 rlogin->closed_on_socket_error = TRUE;
79 notify_remote_exit(rlogin->frontend);
82 /* A socket error has occurred. */
83 logevent(rlogin->frontend, error_msg);
84 connection_fatal(rlogin->frontend, "%s", error_msg);
85 } /* Otherwise, the remote side closed the connection normally. */
89 static int rlogin_receive(Plug plug, int urgent, char *data, int len)
91 Rlogin rlogin = (Rlogin) plug;
99 rlogin_size(rlogin, rlogin->term_width, rlogin->term_height);
102 * We should flush everything (aka Telnet SYNCH) if we see
103 * 0x02, and we should turn off and on _local_ flow control
104 * on 0x10 and 0x20 respectively. I'm not convinced it's
109 * Main rlogin protocol. This is really simple: the first
110 * byte is expected to be NULL and is ignored, and the rest
113 if (rlogin->firstbyte) {
114 if (data[0] == '\0') {
118 rlogin->firstbyte = 0;
121 c_write(rlogin, data, len);
126 static void rlogin_sent(Plug plug, int bufsize)
128 Rlogin rlogin = (Rlogin) plug;
129 rlogin->bufsize = bufsize;
132 static void rlogin_startup(Rlogin rlogin, const char *ruser)
137 sk_write(rlogin->s, &z, 1);
138 p = conf_get_str(rlogin->conf, CONF_localusername);
139 sk_write(rlogin->s, p, strlen(p));
140 sk_write(rlogin->s, &z, 1);
141 sk_write(rlogin->s, ruser, strlen(ruser));
142 sk_write(rlogin->s, &z, 1);
143 p = conf_get_str(rlogin->conf, CONF_termtype);
144 sk_write(rlogin->s, p, strlen(p));
145 sk_write(rlogin->s, "/", 1);
146 p = conf_get_str(rlogin->conf, CONF_termspeed);
147 sk_write(rlogin->s, p, strspn(p, "0123456789"));
148 rlogin->bufsize = sk_write(rlogin->s, &z, 1);
150 rlogin->prompt = NULL;
154 * Called to set up the rlogin connection.
156 * Returns an error message, or NULL on success.
158 * Also places the canonical host name into `realhost'. It must be
159 * freed by the caller.
161 static const char *rlogin_init(void *frontend_handle, void **backend_handle,
163 char *host, int port, char **realhost,
164 int nodelay, int keepalive)
166 static const struct plug_function_table fn_table = {
179 rlogin = snew(struct rlogin_tag);
180 rlogin->fn = &fn_table;
182 rlogin->closed_on_socket_error = FALSE;
183 rlogin->frontend = frontend_handle;
184 rlogin->term_width = conf_get_int(conf, CONF_width);
185 rlogin->term_height = conf_get_int(conf, CONF_height);
186 rlogin->firstbyte = 1;
188 rlogin->prompt = NULL;
189 rlogin->conf = conf_copy(conf);
190 *backend_handle = rlogin;
192 addressfamily = conf_get_int(conf, CONF_addressfamily);
198 buf = dupprintf("Looking up host \"%s\"%s", host,
199 (addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" :
200 (addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" :
202 logevent(rlogin->frontend, buf);
205 addr = name_lookup(host, port, realhost, conf, addressfamily);
206 if ((err = sk_addr_error(addr)) != NULL) {
212 port = 513; /* default rlogin port */
217 rlogin->s = new_connection(addr, *realhost, port, 1, 0,
218 nodelay, keepalive, (Plug) rlogin, conf);
219 if ((err = sk_socket_error(rlogin->s)) != NULL)
222 loghost = conf_get_str(conf, CONF_loghost);
227 *realhost = dupstr(loghost);
228 colon = strrchr(*realhost, ':');
231 * FIXME: if we ever update this aspect of ssh.c for
232 * IPv6 literal management, this should change in line
240 * Send local username, remote username, terminal type and
241 * terminal speed - unless we don't have the remote username yet,
242 * in which case we prompt for it and may end up deferring doing
243 * anything else until the local prompt mechanism returns.
245 if ((ruser = get_remote_username(conf)) != NULL) {
246 rlogin_startup(rlogin, ruser);
251 rlogin->prompt = new_prompts(rlogin->frontend);
252 rlogin->prompt->to_server = TRUE;
253 rlogin->prompt->name = dupstr("Rlogin login name");
254 add_prompt(rlogin->prompt, dupstr("rlogin username: "), TRUE);
255 ret = get_userpass_input(rlogin->prompt, NULL, 0);
257 rlogin_startup(rlogin, rlogin->prompt->prompts[0]->result);
264 static void rlogin_free(void *handle)
266 Rlogin rlogin = (Rlogin) handle;
269 free_prompts(rlogin->prompt);
272 conf_free(rlogin->conf);
277 * Stub routine (we don't have any need to reconfigure this backend).
279 static void rlogin_reconfig(void *handle, Conf *conf)
284 * Called to send data down the rlogin connection.
286 static int rlogin_send(void *handle, char *buf, int len)
288 Rlogin rlogin = (Rlogin) handle;
290 if (rlogin->s == NULL)
293 if (rlogin->prompt) {
295 * We're still prompting for a username, and aren't talking
296 * directly to the network connection yet.
298 int ret = get_userpass_input(rlogin->prompt,
299 (unsigned char *)buf, len);
301 rlogin_startup(rlogin, rlogin->prompt->prompts[0]->result);
302 /* that nulls out rlogin->prompt, so then we'll start sending
303 * data down the wire in the obvious way */
306 rlogin->bufsize = sk_write(rlogin->s, buf, len);
309 return rlogin->bufsize;
313 * Called to query the current socket sendability status.
315 static int rlogin_sendbuffer(void *handle)
317 Rlogin rlogin = (Rlogin) handle;
318 return rlogin->bufsize;
322 * Called to set the size of the window
324 static void rlogin_size(void *handle, int width, int height)
326 Rlogin rlogin = (Rlogin) handle;
327 char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
329 rlogin->term_width = width;
330 rlogin->term_height = height;
332 if (rlogin->s == NULL || !rlogin->cansize)
335 b[6] = rlogin->term_width >> 8;
336 b[7] = rlogin->term_width & 0xFF;
337 b[4] = rlogin->term_height >> 8;
338 b[5] = rlogin->term_height & 0xFF;
339 rlogin->bufsize = sk_write(rlogin->s, b, 12);
344 * Send rlogin special codes.
346 static void rlogin_special(void *handle, Telnet_Special code)
353 * Return a list of the special codes that make sense in this
356 static const struct telnet_special *rlogin_get_specials(void *handle)
361 static int rlogin_connected(void *handle)
363 Rlogin rlogin = (Rlogin) handle;
364 return rlogin->s != NULL;
367 static int rlogin_sendok(void *handle)
369 /* Rlogin rlogin = (Rlogin) handle; */
373 static void rlogin_unthrottle(void *handle, int backlog)
375 Rlogin rlogin = (Rlogin) handle;
376 sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);
379 static int rlogin_ldisc(void *handle, int option)
381 /* Rlogin rlogin = (Rlogin) handle; */
385 static void rlogin_provide_ldisc(void *handle, void *ldisc)
387 /* This is a stub. */
390 static void rlogin_provide_logctx(void *handle, void *logctx)
392 /* This is a stub. */
395 static int rlogin_exitcode(void *handle)
397 Rlogin rlogin = (Rlogin) handle;
398 if (rlogin->s != NULL)
399 return -1; /* still connected */
400 else if (rlogin->closed_on_socket_error)
401 return INT_MAX; /* a socket error counts as an unclean exit */
403 /* If we ever implement RSH, we'll probably need to do this properly */
408 * cfg_info for rlogin does nothing at all.
410 static int rlogin_cfg_info(void *handle)
415 Backend rlogin_backend = {
428 rlogin_provide_ldisc,
429 rlogin_provide_logctx,