18 #define RLOGIN_MAX_BACKLOG 4096
20 typedef struct rlogin_tag
{
21 const struct plug_function_table
*fn
;
22 /* the above field _must_ be first in the structure */
28 int term_width
, term_height
;
33 /* In case we need to read a username from the terminal before starting */
37 static void rlogin_size(void *handle
, int width
, int height
);
39 static void c_write(Rlogin rlogin
, char *buf
, int len
)
41 int backlog
= from_backend(rlogin
->frontend
, 0, buf
, len
);
42 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
45 static void rlogin_log(Plug plug
, int type
, SockAddr addr
, int port
,
46 const char *error_msg
, int error_code
)
48 Rlogin rlogin
= (Rlogin
) plug
;
49 char addrbuf
[256], *msg
;
51 sk_getaddr(addr
, addrbuf
, lenof(addrbuf
));
54 msg
= dupprintf("Connecting to %s port %d", addrbuf
, port
);
56 msg
= dupprintf("Failed to connect to %s: %s", addrbuf
, error_msg
);
58 logevent(rlogin
->frontend
, msg
);
61 static int rlogin_closing(Plug plug
, const char *error_msg
, int error_code
,
64 Rlogin rlogin
= (Rlogin
) plug
;
67 * We don't implement independent EOF in each direction for Telnet
68 * connections; as soon as we get word that the remote side has
69 * sent us EOF, we wind up the whole connection.
75 notify_remote_exit(rlogin
->frontend
);
78 /* A socket error has occurred. */
79 logevent(rlogin
->frontend
, error_msg
);
80 connection_fatal(rlogin
->frontend
, "%s", error_msg
);
81 } /* Otherwise, the remote side closed the connection normally. */
85 static int rlogin_receive(Plug plug
, int urgent
, char *data
, int len
)
87 Rlogin rlogin
= (Rlogin
) plug
;
95 rlogin_size(rlogin
, rlogin
->term_width
, rlogin
->term_height
);
98 * We should flush everything (aka Telnet SYNCH) if we see
99 * 0x02, and we should turn off and on _local_ flow control
100 * on 0x10 and 0x20 respectively. I'm not convinced it's
105 * Main rlogin protocol. This is really simple: the first
106 * byte is expected to be NULL and is ignored, and the rest
109 if (rlogin
->firstbyte
) {
110 if (data
[0] == '\0') {
114 rlogin
->firstbyte
= 0;
117 c_write(rlogin
, data
, len
);
122 static void rlogin_sent(Plug plug
, int bufsize
)
124 Rlogin rlogin
= (Rlogin
) plug
;
125 rlogin
->bufsize
= bufsize
;
128 static void rlogin_startup(Rlogin rlogin
, const char *ruser
)
133 sk_write(rlogin
->s
, &z
, 1);
134 p
= conf_get_str(rlogin
->conf
, CONF_localusername
);
135 sk_write(rlogin
->s
, p
, strlen(p
));
136 sk_write(rlogin
->s
, &z
, 1);
137 sk_write(rlogin
->s
, ruser
, strlen(ruser
));
138 sk_write(rlogin
->s
, &z
, 1);
139 p
= conf_get_str(rlogin
->conf
, CONF_termtype
);
140 sk_write(rlogin
->s
, p
, strlen(p
));
141 sk_write(rlogin
->s
, "/", 1);
142 p
= conf_get_str(rlogin
->conf
, CONF_termspeed
);
143 sk_write(rlogin
->s
, p
, strspn(p
, "0123456789"));
144 rlogin
->bufsize
= sk_write(rlogin
->s
, &z
, 1);
146 rlogin
->prompt
= NULL
;
150 * Called to set up the rlogin connection.
152 * Returns an error message, or NULL on success.
154 * Also places the canonical host name into `realhost'. It must be
155 * freed by the caller.
157 static const char *rlogin_init(void *frontend_handle
, void **backend_handle
,
159 char *host
, int port
, char **realhost
,
160 int nodelay
, int keepalive
)
162 static const struct plug_function_table fn_table
= {
175 rlogin
= snew(struct rlogin_tag
);
176 rlogin
->fn
= &fn_table
;
178 rlogin
->frontend
= frontend_handle
;
179 rlogin
->term_width
= conf_get_int(conf
, CONF_width
);
180 rlogin
->term_height
= conf_get_int(conf
, CONF_height
);
181 rlogin
->firstbyte
= 1;
183 rlogin
->prompt
= NULL
;
184 rlogin
->conf
= conf_copy(conf
);
185 *backend_handle
= rlogin
;
187 addressfamily
= conf_get_int(conf
, CONF_addressfamily
);
193 buf
= dupprintf("Looking up host \"%s\"%s", host
,
194 (addressfamily
== ADDRTYPE_IPV4 ?
" (IPv4)" :
195 (addressfamily
== ADDRTYPE_IPV6 ?
" (IPv6)" :
197 logevent(rlogin
->frontend
, buf
);
200 addr
= name_lookup(host
, port
, realhost
, conf
, addressfamily
);
201 if ((err
= sk_addr_error(addr
)) != NULL
) {
207 port
= 513; /* default rlogin port */
212 rlogin
->s
= new_connection(addr
, *realhost
, port
, 1, 0,
213 nodelay
, keepalive
, (Plug
) rlogin
, conf
);
214 if ((err
= sk_socket_error(rlogin
->s
)) != NULL
)
217 loghost
= conf_get_str(conf
, CONF_loghost
);
222 *realhost
= dupstr(loghost
);
223 colon
= strrchr(*realhost
, ':');
226 * FIXME: if we ever update this aspect of ssh.c for
227 * IPv6 literal management, this should change in line
235 * Send local username, remote username, terminal type and
236 * terminal speed - unless we don't have the remote username yet,
237 * in which case we prompt for it and may end up deferring doing
238 * anything else until the local prompt mechanism returns.
240 if ((ruser
= get_remote_username(conf
)) != NULL
) {
241 rlogin_startup(rlogin
, ruser
);
246 rlogin
->prompt
= new_prompts(rlogin
->frontend
);
247 rlogin
->prompt
->to_server
= TRUE
;
248 rlogin
->prompt
->name
= dupstr("Rlogin login name");
249 add_prompt(rlogin
->prompt
, dupstr("rlogin username: "), TRUE
);
250 ret
= get_userpass_input(rlogin
->prompt
, NULL
, 0);
252 rlogin_startup(rlogin
, rlogin
->prompt
->prompts
[0]->result
);
259 static void rlogin_free(void *handle
)
261 Rlogin rlogin
= (Rlogin
) handle
;
264 free_prompts(rlogin
->prompt
);
267 conf_free(rlogin
->conf
);
272 * Stub routine (we don't have any need to reconfigure this backend).
274 static void rlogin_reconfig(void *handle
, Conf
*conf
)
279 * Called to send data down the rlogin connection.
281 static int rlogin_send(void *handle
, char *buf
, int len
)
283 Rlogin rlogin
= (Rlogin
) handle
;
285 if (rlogin
->s
== NULL
)
288 if (rlogin
->prompt
) {
290 * We're still prompting for a username, and aren't talking
291 * directly to the network connection yet.
293 int ret
= get_userpass_input(rlogin
->prompt
,
294 (unsigned char *)buf
, len
);
296 rlogin_startup(rlogin
, rlogin
->prompt
->prompts
[0]->result
);
297 /* that nulls out rlogin->prompt, so then we'll start sending
298 * data down the wire in the obvious way */
301 rlogin
->bufsize
= sk_write(rlogin
->s
, buf
, len
);
304 return rlogin
->bufsize
;
308 * Called to query the current socket sendability status.
310 static int rlogin_sendbuffer(void *handle
)
312 Rlogin rlogin
= (Rlogin
) handle
;
313 return rlogin
->bufsize
;
317 * Called to set the size of the window
319 static void rlogin_size(void *handle
, int width
, int height
)
321 Rlogin rlogin
= (Rlogin
) handle
;
322 char b
[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
324 rlogin
->term_width
= width
;
325 rlogin
->term_height
= height
;
327 if (rlogin
->s
== NULL
|| !rlogin
->cansize
)
330 b
[6] = rlogin
->term_width
>> 8;
331 b
[7] = rlogin
->term_width
& 0xFF;
332 b
[4] = rlogin
->term_height
>> 8;
333 b
[5] = rlogin
->term_height
& 0xFF;
334 rlogin
->bufsize
= sk_write(rlogin
->s
, b
, 12);
339 * Send rlogin special codes.
341 static void rlogin_special(void *handle
, Telnet_Special code
)
348 * Return a list of the special codes that make sense in this
351 static const struct telnet_special
*rlogin_get_specials(void *handle
)
356 static int rlogin_connected(void *handle
)
358 Rlogin rlogin
= (Rlogin
) handle
;
359 return rlogin
->s
!= NULL
;
362 static int rlogin_sendok(void *handle
)
364 /* Rlogin rlogin = (Rlogin) handle; */
368 static void rlogin_unthrottle(void *handle
, int backlog
)
370 Rlogin rlogin
= (Rlogin
) handle
;
371 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
374 static int rlogin_ldisc(void *handle
, int option
)
376 /* Rlogin rlogin = (Rlogin) handle; */
380 static void rlogin_provide_ldisc(void *handle
, void *ldisc
)
382 /* This is a stub. */
385 static void rlogin_provide_logctx(void *handle
, void *logctx
)
387 /* This is a stub. */
390 static int rlogin_exitcode(void *handle
)
392 Rlogin rlogin
= (Rlogin
) handle
;
393 if (rlogin
->s
!= NULL
)
394 return -1; /* still connected */
396 /* If we ever implement RSH, we'll probably need to do this properly */
401 * cfg_info for rlogin does nothing at all.
403 static int rlogin_cfg_info(void *handle
)
408 Backend rlogin_backend
= {
421 rlogin_provide_ldisc
,
422 rlogin_provide_logctx
,