14 #define RLOGIN_MAX_BACKLOG 4096
16 typedef struct rlogin_tag
{
17 const struct plug_function_table
*fn
;
18 /* the above field _must_ be first in the structure */
23 int term_width
, term_height
;
27 static void rlogin_size(void *handle
, int width
, int height
);
29 static void c_write(Rlogin rlogin
, char *buf
, int len
)
31 int backlog
= from_backend(rlogin
->frontend
, 0, buf
, len
);
32 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
35 static int rlogin_closing(Plug plug
, const char *error_msg
, int error_code
,
38 Rlogin rlogin
= (Rlogin
) plug
;
42 notify_remote_exit(rlogin
->frontend
);
45 /* A socket error has occurred. */
46 logevent(rlogin
->frontend
, error_msg
);
47 connection_fatal(rlogin
->frontend
, "%s", error_msg
);
48 } /* Otherwise, the remote side closed the connection normally. */
52 static int rlogin_receive(Plug plug
, int urgent
, char *data
, int len
)
54 Rlogin rlogin
= (Rlogin
) plug
;
61 rlogin_size(rlogin
, rlogin
->term_width
, rlogin
->term_height
);
63 * We should flush everything (aka Telnet SYNCH) if we see
64 * 0x02, and we should turn off and on _local_ flow control
65 * on 0x10 and 0x20 respectively. I'm not convinced it's
70 * Main rlogin protocol. This is really simple: the first
71 * byte is expected to be NULL and is ignored, and the rest
74 if (rlogin
->firstbyte
) {
75 if (data
[0] == '\0') {
79 rlogin
->firstbyte
= 0;
82 c_write(rlogin
, data
, len
);
87 static void rlogin_sent(Plug plug
, int bufsize
)
89 Rlogin rlogin
= (Rlogin
) plug
;
90 rlogin
->bufsize
= bufsize
;
94 * Called to set up the rlogin connection.
96 * Returns an error message, or NULL on success.
98 * Also places the canonical host name into `realhost'. It must be
99 * freed by the caller.
101 static const char *rlogin_init(void *frontend_handle
, void **backend_handle
,
103 char *host
, int port
, char **realhost
,
104 int nodelay
, int keepalive
)
106 static const struct plug_function_table fn_table
= {
115 rlogin
= snew(struct rlogin_tag
);
116 rlogin
->fn
= &fn_table
;
118 rlogin
->frontend
= frontend_handle
;
119 rlogin
->term_width
= cfg
->width
;
120 rlogin
->term_height
= cfg
->height
;
121 rlogin
->firstbyte
= 1;
122 *backend_handle
= rlogin
;
129 buf
= dupprintf("Looking up host \"%s\"", host
);
130 logevent(rlogin
->frontend
, buf
);
133 addr
= name_lookup(host
, port
, realhost
, cfg
);
134 if ((err
= sk_addr_error(addr
)) != NULL
) {
140 port
= 513; /* default rlogin port */
146 char *buf
, addrbuf
[100];
147 sk_getaddr(addr
, addrbuf
, 100);
148 buf
= dupprintf("Connecting to %s port %d", addrbuf
, port
);
149 logevent(rlogin
->frontend
, buf
);
152 rlogin
->s
= new_connection(addr
, *realhost
, port
, 1, 0,
153 nodelay
, keepalive
, (Plug
) rlogin
, cfg
);
154 if ((err
= sk_socket_error(rlogin
->s
)) != NULL
)
158 * Send local username, remote username, terminal/speed
164 sk_write(rlogin
->s
, &z
, 1);
165 sk_write(rlogin
->s
, cfg
->localusername
,
166 strlen(cfg
->localusername
));
167 sk_write(rlogin
->s
, &z
, 1);
168 sk_write(rlogin
->s
, cfg
->username
,
169 strlen(cfg
->username
));
170 sk_write(rlogin
->s
, &z
, 1);
171 sk_write(rlogin
->s
, cfg
->termtype
,
172 strlen(cfg
->termtype
));
173 sk_write(rlogin
->s
, "/", 1);
174 for (p
= cfg
->termspeed
; isdigit((unsigned char)*p
); p
++) continue;
175 sk_write(rlogin
->s
, cfg
->termspeed
, p
- cfg
->termspeed
);
176 rlogin
->bufsize
= sk_write(rlogin
->s
, &z
, 1);
182 static void rlogin_free(void *handle
)
184 Rlogin rlogin
= (Rlogin
) handle
;
192 * Stub routine (we don't have any need to reconfigure this backend).
194 static void rlogin_reconfig(void *handle
, Config
*cfg
)
199 * Called to send data down the rlogin connection.
201 static int rlogin_send(void *handle
, char *buf
, int len
)
203 Rlogin rlogin
= (Rlogin
) handle
;
205 if (rlogin
->s
== NULL
)
208 rlogin
->bufsize
= sk_write(rlogin
->s
, buf
, len
);
210 return rlogin
->bufsize
;
214 * Called to query the current socket sendability status.
216 static int rlogin_sendbuffer(void *handle
)
218 Rlogin rlogin
= (Rlogin
) handle
;
219 return rlogin
->bufsize
;
223 * Called to set the size of the window
225 static void rlogin_size(void *handle
, int width
, int height
)
227 Rlogin rlogin
= (Rlogin
) handle
;
228 char b
[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
230 rlogin
->term_width
= width
;
231 rlogin
->term_height
= height
;
233 if (rlogin
->s
== NULL
)
236 b
[6] = rlogin
->term_width
>> 8;
237 b
[7] = rlogin
->term_width
& 0xFF;
238 b
[4] = rlogin
->term_height
>> 8;
239 b
[5] = rlogin
->term_height
& 0xFF;
240 rlogin
->bufsize
= sk_write(rlogin
->s
, b
, 12);
245 * Send rlogin special codes.
247 static void rlogin_special(void *handle
, Telnet_Special code
)
254 * Return a list of the special codes that make sense in this
257 static const struct telnet_special
*rlogin_get_specials(void *handle
)
262 static Socket
rlogin_socket(void *handle
)
264 Rlogin rlogin
= (Rlogin
) handle
;
268 static int rlogin_sendok(void *handle
)
270 /* Rlogin rlogin = (Rlogin) handle; */
274 static void rlogin_unthrottle(void *handle
, int backlog
)
276 Rlogin rlogin
= (Rlogin
) handle
;
277 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
280 static int rlogin_ldisc(void *handle
, int option
)
282 /* Rlogin rlogin = (Rlogin) handle; */
286 static void rlogin_provide_ldisc(void *handle
, void *ldisc
)
288 /* This is a stub. */
291 static void rlogin_provide_logctx(void *handle
, void *logctx
)
293 /* This is a stub. */
296 static int rlogin_exitcode(void *handle
)
298 Rlogin rlogin
= (Rlogin
) handle
;
299 if (rlogin
->s
!= NULL
)
300 return -1; /* still connected */
302 /* If we ever implement RSH, we'll probably need to do this properly */
306 Backend rlogin_backend
= {
319 rlogin_provide_ldisc
,
320 rlogin_provide_logctx
,