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
;
44 /* A socket error has occurred. */
45 logevent(rlogin
->frontend
, error_msg
);
46 connection_fatal(rlogin
->frontend
, "%s", error_msg
);
47 } /* Otherwise, the remote side closed the connection normally. */
51 static int rlogin_receive(Plug plug
, int urgent
, char *data
, int len
)
53 Rlogin rlogin
= (Rlogin
) plug
;
60 rlogin_size(rlogin
, rlogin
->term_width
, rlogin
->term_height
);
62 * We should flush everything (aka Telnet SYNCH) if we see
63 * 0x02, and we should turn off and on _local_ flow control
64 * on 0x10 and 0x20 respectively. I'm not convinced it's
69 * Main rlogin protocol. This is really simple: the first
70 * byte is expected to be NULL and is ignored, and the rest
73 if (rlogin
->firstbyte
) {
74 if (data
[0] == '\0') {
78 rlogin
->firstbyte
= 0;
81 c_write(rlogin
, data
, len
);
86 static void rlogin_sent(Plug plug
, int bufsize
)
88 Rlogin rlogin
= (Rlogin
) plug
;
89 rlogin
->bufsize
= bufsize
;
93 * Called to set up the rlogin connection.
95 * Returns an error message, or NULL on success.
97 * Also places the canonical host name into `realhost'. It must be
98 * freed by the caller.
100 static const char *rlogin_init(void *frontend_handle
, void **backend_handle
,
102 char *host
, int port
, char **realhost
,
103 int nodelay
, int keepalive
)
105 static const struct plug_function_table fn_table
= {
114 rlogin
= snew(struct rlogin_tag
);
115 rlogin
->fn
= &fn_table
;
117 rlogin
->frontend
= frontend_handle
;
118 rlogin
->term_width
= cfg
->width
;
119 rlogin
->term_height
= cfg
->height
;
120 rlogin
->firstbyte
= 1;
121 *backend_handle
= rlogin
;
128 buf
= dupprintf("Looking up host \"%s\"", host
);
129 logevent(rlogin
->frontend
, buf
);
132 addr
= name_lookup(host
, port
, realhost
, cfg
);
133 if ((err
= sk_addr_error(addr
)) != NULL
) {
139 port
= 513; /* default rlogin port */
145 char *buf
, addrbuf
[100];
146 sk_getaddr(addr
, addrbuf
, 100);
147 buf
= dupprintf("Connecting to %s port %d", addrbuf
, port
);
148 logevent(rlogin
->frontend
, buf
);
151 rlogin
->s
= new_connection(addr
, *realhost
, port
, 1, 0,
152 nodelay
, keepalive
, (Plug
) rlogin
, cfg
);
153 if ((err
= sk_socket_error(rlogin
->s
)) != NULL
)
157 * Send local username, remote username, terminal/speed
163 sk_write(rlogin
->s
, &z
, 1);
164 sk_write(rlogin
->s
, cfg
->localusername
,
165 strlen(cfg
->localusername
));
166 sk_write(rlogin
->s
, &z
, 1);
167 sk_write(rlogin
->s
, cfg
->username
,
168 strlen(cfg
->username
));
169 sk_write(rlogin
->s
, &z
, 1);
170 sk_write(rlogin
->s
, cfg
->termtype
,
171 strlen(cfg
->termtype
));
172 sk_write(rlogin
->s
, "/", 1);
173 for (p
= cfg
->termspeed
; isdigit((unsigned char)*p
); p
++) continue;
174 sk_write(rlogin
->s
, cfg
->termspeed
, p
- cfg
->termspeed
);
175 rlogin
->bufsize
= sk_write(rlogin
->s
, &z
, 1);
181 static void rlogin_free(void *handle
)
183 Rlogin rlogin
= (Rlogin
) handle
;
191 * Stub routine (we don't have any need to reconfigure this backend).
193 static void rlogin_reconfig(void *handle
, Config
*cfg
)
198 * Called to send data down the rlogin connection.
200 static int rlogin_send(void *handle
, char *buf
, int len
)
202 Rlogin rlogin
= (Rlogin
) handle
;
204 if (rlogin
->s
== NULL
)
207 rlogin
->bufsize
= sk_write(rlogin
->s
, buf
, len
);
209 return rlogin
->bufsize
;
213 * Called to query the current socket sendability status.
215 static int rlogin_sendbuffer(void *handle
)
217 Rlogin rlogin
= (Rlogin
) handle
;
218 return rlogin
->bufsize
;
222 * Called to set the size of the window
224 static void rlogin_size(void *handle
, int width
, int height
)
226 Rlogin rlogin
= (Rlogin
) handle
;
227 char b
[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
229 rlogin
->term_width
= width
;
230 rlogin
->term_height
= height
;
232 if (rlogin
->s
== NULL
)
235 b
[6] = rlogin
->term_width
>> 8;
236 b
[7] = rlogin
->term_width
& 0xFF;
237 b
[4] = rlogin
->term_height
>> 8;
238 b
[5] = rlogin
->term_height
& 0xFF;
239 rlogin
->bufsize
= sk_write(rlogin
->s
, b
, 12);
244 * Send rlogin special codes.
246 static void rlogin_special(void *handle
, Telnet_Special code
)
253 * Return a list of the special codes that make sense in this
256 static const struct telnet_special
*rlogin_get_specials(void *handle
)
261 static Socket
rlogin_socket(void *handle
)
263 Rlogin rlogin
= (Rlogin
) handle
;
267 static int rlogin_sendok(void *handle
)
269 /* Rlogin rlogin = (Rlogin) handle; */
273 static void rlogin_unthrottle(void *handle
, int backlog
)
275 Rlogin rlogin
= (Rlogin
) handle
;
276 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
279 static int rlogin_ldisc(void *handle
, int option
)
281 /* Rlogin rlogin = (Rlogin) handle; */
285 static void rlogin_provide_ldisc(void *handle
, void *ldisc
)
287 /* This is a stub. */
290 static void rlogin_provide_logctx(void *handle
, void *logctx
)
292 /* This is a stub. */
295 static int rlogin_exitcode(void *handle
)
297 Rlogin rlogin
= (Rlogin
) handle
;
298 if (rlogin
->s
!= NULL
)
299 return -1; /* still connected */
301 /* If we ever implement RSH, we'll probably need to do this properly */
305 Backend rlogin_backend
= {
318 rlogin_provide_ldisc
,
319 rlogin_provide_logctx
,