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
)
125 sk_write(rlogin
->s
, &z
, 1);
126 sk_write(rlogin
->s
, rlogin
->cfg
.localusername
,
127 strlen(rlogin
->cfg
.localusername
));
128 sk_write(rlogin
->s
, &z
, 1);
129 sk_write(rlogin
->s
, ruser
,
131 sk_write(rlogin
->s
, &z
, 1);
132 sk_write(rlogin
->s
, rlogin
->cfg
.termtype
,
133 strlen(rlogin
->cfg
.termtype
));
134 sk_write(rlogin
->s
, "/", 1);
135 for (p
= rlogin
->cfg
.termspeed
; isdigit((unsigned char)*p
); p
++) continue;
136 sk_write(rlogin
->s
, rlogin
->cfg
.termspeed
, p
- rlogin
->cfg
.termspeed
);
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
= {
164 char ruser
[sizeof(cfg
->username
)];
166 rlogin
= snew(struct rlogin_tag
);
167 rlogin
->fn
= &fn_table
;
169 rlogin
->frontend
= frontend_handle
;
170 rlogin
->term_width
= cfg
->width
;
171 rlogin
->term_height
= cfg
->height
;
172 rlogin
->firstbyte
= 1;
174 rlogin
->prompt
= NULL
;
175 rlogin
->cfg
= *cfg
; /* STRUCTURE COPY */
176 *backend_handle
= rlogin
;
183 buf
= dupprintf("Looking up host \"%s\"%s", host
,
184 (cfg
->addressfamily
== ADDRTYPE_IPV4 ?
" (IPv4)" :
185 (cfg
->addressfamily
== ADDRTYPE_IPV6 ?
" (IPv6)" :
187 logevent(rlogin
->frontend
, buf
);
190 addr
= name_lookup(host
, port
, realhost
, cfg
, cfg
->addressfamily
);
191 if ((err
= sk_addr_error(addr
)) != NULL
) {
197 port
= 513; /* default rlogin port */
202 rlogin
->s
= new_connection(addr
, *realhost
, port
, 1, 0,
203 nodelay
, keepalive
, (Plug
) rlogin
, cfg
);
204 if ((err
= sk_socket_error(rlogin
->s
)) != NULL
)
211 *realhost
= dupstr(cfg
->loghost
);
212 colon
= strrchr(*realhost
, ':');
215 * FIXME: if we ever update this aspect of ssh.c for
216 * IPv6 literal management, this should change in line
224 * Send local username, remote username, terminal type and
225 * terminal speed - unless we don't have the remote username yet,
226 * in which case we prompt for it and may end up deferring doing
227 * anything else until the local prompt mechanism returns.
229 if (get_remote_username(cfg
, ruser
, sizeof(ruser
))) {
230 rlogin_startup(rlogin
, ruser
);
234 rlogin
->prompt
= new_prompts(rlogin
->frontend
);
235 rlogin
->prompt
->to_server
= TRUE
;
236 rlogin
->prompt
->name
= dupstr("Rlogin login name");
237 add_prompt(rlogin
->prompt
, dupstr("rlogin username: "), TRUE
,
238 sizeof(cfg
->username
));
239 ret
= get_userpass_input(rlogin
->prompt
, NULL
, 0);
241 rlogin_startup(rlogin
, rlogin
->prompt
->prompts
[0]->result
);
248 static void rlogin_free(void *handle
)
250 Rlogin rlogin
= (Rlogin
) handle
;
253 free_prompts(rlogin
->prompt
);
260 * Stub routine (we don't have any need to reconfigure this backend).
262 static void rlogin_reconfig(void *handle
, Config
*cfg
)
267 * Called to send data down the rlogin connection.
269 static int rlogin_send(void *handle
, char *buf
, int len
)
271 Rlogin rlogin
= (Rlogin
) handle
;
273 if (rlogin
->s
== NULL
)
276 if (rlogin
->prompt
) {
278 * We're still prompting for a username, and aren't talking
279 * directly to the network connection yet.
281 int ret
= get_userpass_input(rlogin
->prompt
,
282 (unsigned char *)buf
, len
);
284 rlogin_startup(rlogin
, rlogin
->prompt
->prompts
[0]->result
);
285 /* that nulls out rlogin->prompt, so then we'll start sending
286 * data down the wire in the obvious way */
289 rlogin
->bufsize
= sk_write(rlogin
->s
, buf
, len
);
292 return rlogin
->bufsize
;
296 * Called to query the current socket sendability status.
298 static int rlogin_sendbuffer(void *handle
)
300 Rlogin rlogin
= (Rlogin
) handle
;
301 return rlogin
->bufsize
;
305 * Called to set the size of the window
307 static void rlogin_size(void *handle
, int width
, int height
)
309 Rlogin rlogin
= (Rlogin
) handle
;
310 char b
[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
312 rlogin
->term_width
= width
;
313 rlogin
->term_height
= height
;
315 if (rlogin
->s
== NULL
|| !rlogin
->cansize
)
318 b
[6] = rlogin
->term_width
>> 8;
319 b
[7] = rlogin
->term_width
& 0xFF;
320 b
[4] = rlogin
->term_height
>> 8;
321 b
[5] = rlogin
->term_height
& 0xFF;
322 rlogin
->bufsize
= sk_write(rlogin
->s
, b
, 12);
327 * Send rlogin special codes.
329 static void rlogin_special(void *handle
, Telnet_Special code
)
336 * Return a list of the special codes that make sense in this
339 static const struct telnet_special
*rlogin_get_specials(void *handle
)
344 static int rlogin_connected(void *handle
)
346 Rlogin rlogin
= (Rlogin
) handle
;
347 return rlogin
->s
!= NULL
;
350 static int rlogin_sendok(void *handle
)
352 /* Rlogin rlogin = (Rlogin) handle; */
356 static void rlogin_unthrottle(void *handle
, int backlog
)
358 Rlogin rlogin
= (Rlogin
) handle
;
359 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
362 static int rlogin_ldisc(void *handle
, int option
)
364 /* Rlogin rlogin = (Rlogin) handle; */
368 static void rlogin_provide_ldisc(void *handle
, void *ldisc
)
370 /* This is a stub. */
373 static void rlogin_provide_logctx(void *handle
, void *logctx
)
375 /* This is a stub. */
378 static int rlogin_exitcode(void *handle
)
380 Rlogin rlogin
= (Rlogin
) handle
;
381 if (rlogin
->s
!= NULL
)
382 return -1; /* still connected */
384 /* If we ever implement RSH, we'll probably need to do this properly */
389 * cfg_info for rlogin does nothing at all.
391 static int rlogin_cfg_info(void *handle
)
396 Backend rlogin_backend
= {
409 rlogin_provide_ldisc
,
410 rlogin_provide_logctx
,