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
;
68 notify_remote_exit(rlogin
->frontend
);
71 /* A socket error has occurred. */
72 logevent(rlogin
->frontend
, error_msg
);
73 connection_fatal(rlogin
->frontend
, "%s", error_msg
);
74 } /* Otherwise, the remote side closed the connection normally. */
78 static int rlogin_receive(Plug plug
, int urgent
, char *data
, int len
)
80 Rlogin rlogin
= (Rlogin
) plug
;
88 rlogin_size(rlogin
, rlogin
->term_width
, rlogin
->term_height
);
91 * We should flush everything (aka Telnet SYNCH) if we see
92 * 0x02, and we should turn off and on _local_ flow control
93 * on 0x10 and 0x20 respectively. I'm not convinced it's
98 * Main rlogin protocol. This is really simple: the first
99 * byte is expected to be NULL and is ignored, and the rest
102 if (rlogin
->firstbyte
) {
103 if (data
[0] == '\0') {
107 rlogin
->firstbyte
= 0;
110 c_write(rlogin
, data
, len
);
115 static void rlogin_sent(Plug plug
, int bufsize
)
117 Rlogin rlogin
= (Rlogin
) plug
;
118 rlogin
->bufsize
= bufsize
;
121 static void rlogin_startup(Rlogin rlogin
, const char *ruser
)
126 sk_write(rlogin
->s
, &z
, 1);
127 p
= conf_get_str(rlogin
->conf
, CONF_localusername
);
128 sk_write(rlogin
->s
, p
, strlen(p
));
129 sk_write(rlogin
->s
, &z
, 1);
130 sk_write(rlogin
->s
, ruser
, strlen(ruser
));
131 sk_write(rlogin
->s
, &z
, 1);
132 p
= conf_get_str(rlogin
->conf
, CONF_termtype
);
133 sk_write(rlogin
->s
, p
, strlen(p
));
134 sk_write(rlogin
->s
, "/", 1);
135 p
= conf_get_str(rlogin
->conf
, CONF_termspeed
);
136 sk_write(rlogin
->s
, p
, strspn(p
, "0123456789"));
137 rlogin
->bufsize
= sk_write(rlogin
->s
, &z
, 1);
139 rlogin
->prompt
= NULL
;
143 * Called to set up the rlogin connection.
145 * Returns an error message, or NULL on success.
147 * Also places the canonical host name into `realhost'. It must be
148 * freed by the caller.
150 static const char *rlogin_init(void *frontend_handle
, void **backend_handle
,
152 char *host
, int port
, char **realhost
,
153 int nodelay
, int keepalive
)
155 static const struct plug_function_table fn_table
= {
168 rlogin
= snew(struct rlogin_tag
);
169 rlogin
->fn
= &fn_table
;
171 rlogin
->frontend
= frontend_handle
;
172 rlogin
->term_width
= conf_get_int(conf
, CONF_width
);
173 rlogin
->term_height
= conf_get_int(conf
, CONF_height
);
174 rlogin
->firstbyte
= 1;
176 rlogin
->prompt
= NULL
;
177 rlogin
->conf
= conf_copy(conf
);
178 *backend_handle
= rlogin
;
180 addressfamily
= conf_get_int(conf
, CONF_addressfamily
);
186 buf
= dupprintf("Looking up host \"%s\"%s", host
,
187 (addressfamily
== ADDRTYPE_IPV4 ?
" (IPv4)" :
188 (addressfamily
== ADDRTYPE_IPV6 ?
" (IPv6)" :
190 logevent(rlogin
->frontend
, buf
);
193 addr
= name_lookup(host
, port
, realhost
, conf
, addressfamily
);
194 if ((err
= sk_addr_error(addr
)) != NULL
) {
200 port
= 513; /* default rlogin port */
205 rlogin
->s
= new_connection(addr
, *realhost
, port
, 1, 0,
206 nodelay
, keepalive
, (Plug
) rlogin
, conf
);
207 if ((err
= sk_socket_error(rlogin
->s
)) != NULL
)
210 loghost
= conf_get_str(conf
, CONF_loghost
);
215 *realhost
= dupstr(loghost
);
216 colon
= strrchr(*realhost
, ':');
219 * FIXME: if we ever update this aspect of ssh.c for
220 * IPv6 literal management, this should change in line
228 * Send local username, remote username, terminal type and
229 * terminal speed - unless we don't have the remote username yet,
230 * in which case we prompt for it and may end up deferring doing
231 * anything else until the local prompt mechanism returns.
233 if ((ruser
= get_remote_username(conf
)) == NULL
) {
234 rlogin_startup(rlogin
, ruser
);
239 rlogin
->prompt
= new_prompts(rlogin
->frontend
);
240 rlogin
->prompt
->to_server
= TRUE
;
241 rlogin
->prompt
->name
= dupstr("Rlogin login name");
242 /* 512 is an arbitrary limit :-( */
243 add_prompt(rlogin
->prompt
, dupstr("rlogin username: "), TRUE
, 512);
244 ret
= get_userpass_input(rlogin
->prompt
, NULL
, 0);
246 rlogin_startup(rlogin
, rlogin
->prompt
->prompts
[0]->result
);
253 static void rlogin_free(void *handle
)
255 Rlogin rlogin
= (Rlogin
) handle
;
258 free_prompts(rlogin
->prompt
);
261 conf_free(rlogin
->conf
);
266 * Stub routine (we don't have any need to reconfigure this backend).
268 static void rlogin_reconfig(void *handle
, Conf
*conf
)
273 * Called to send data down the rlogin connection.
275 static int rlogin_send(void *handle
, char *buf
, int len
)
277 Rlogin rlogin
= (Rlogin
) handle
;
279 if (rlogin
->s
== NULL
)
282 if (rlogin
->prompt
) {
284 * We're still prompting for a username, and aren't talking
285 * directly to the network connection yet.
287 int ret
= get_userpass_input(rlogin
->prompt
,
288 (unsigned char *)buf
, len
);
290 rlogin_startup(rlogin
, rlogin
->prompt
->prompts
[0]->result
);
291 /* that nulls out rlogin->prompt, so then we'll start sending
292 * data down the wire in the obvious way */
295 rlogin
->bufsize
= sk_write(rlogin
->s
, buf
, len
);
298 return rlogin
->bufsize
;
302 * Called to query the current socket sendability status.
304 static int rlogin_sendbuffer(void *handle
)
306 Rlogin rlogin
= (Rlogin
) handle
;
307 return rlogin
->bufsize
;
311 * Called to set the size of the window
313 static void rlogin_size(void *handle
, int width
, int height
)
315 Rlogin rlogin
= (Rlogin
) handle
;
316 char b
[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
318 rlogin
->term_width
= width
;
319 rlogin
->term_height
= height
;
321 if (rlogin
->s
== NULL
|| !rlogin
->cansize
)
324 b
[6] = rlogin
->term_width
>> 8;
325 b
[7] = rlogin
->term_width
& 0xFF;
326 b
[4] = rlogin
->term_height
>> 8;
327 b
[5] = rlogin
->term_height
& 0xFF;
328 rlogin
->bufsize
= sk_write(rlogin
->s
, b
, 12);
333 * Send rlogin special codes.
335 static void rlogin_special(void *handle
, Telnet_Special code
)
342 * Return a list of the special codes that make sense in this
345 static const struct telnet_special
*rlogin_get_specials(void *handle
)
350 static int rlogin_connected(void *handle
)
352 Rlogin rlogin
= (Rlogin
) handle
;
353 return rlogin
->s
!= NULL
;
356 static int rlogin_sendok(void *handle
)
358 /* Rlogin rlogin = (Rlogin) handle; */
362 static void rlogin_unthrottle(void *handle
, int backlog
)
364 Rlogin rlogin
= (Rlogin
) handle
;
365 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
368 static int rlogin_ldisc(void *handle
, int option
)
370 /* Rlogin rlogin = (Rlogin) handle; */
374 static void rlogin_provide_ldisc(void *handle
, void *ldisc
)
376 /* This is a stub. */
379 static void rlogin_provide_logctx(void *handle
, void *logctx
)
381 /* This is a stub. */
384 static int rlogin_exitcode(void *handle
)
386 Rlogin rlogin
= (Rlogin
) handle
;
387 if (rlogin
->s
!= NULL
)
388 return -1; /* still connected */
390 /* If we ever implement RSH, we'll probably need to do this properly */
395 * cfg_info for rlogin does nothing at all.
397 static int rlogin_cfg_info(void *handle
)
402 Backend rlogin_backend
= {
415 rlogin_provide_ldisc
,
416 rlogin_provide_logctx
,