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
, 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("%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 char *rlogin_init(void *frontend_handle
, void **backend_handle
,
102 char *host
, int port
, char **realhost
, int nodelay
)
104 static const struct plug_function_table fn_table
= {
113 rlogin
= smalloc(sizeof(*rlogin
));
114 rlogin
->fn
= &fn_table
;
116 rlogin
->frontend
= frontend_handle
;
117 rlogin
->term_width
= cfg
->width
;
118 rlogin
->term_height
= cfg
->height
;
119 rlogin
->firstbyte
= 1;
120 *backend_handle
= rlogin
;
127 buf
= dupprintf("Looking up host \"%s\"", host
);
128 logevent(rlogin
->frontend
, buf
);
131 addr
= name_lookup(host
, port
, realhost
, cfg
);
132 if ((err
= sk_addr_error(addr
)) != NULL
)
136 port
= 513; /* default rlogin port */
142 char *buf
, addrbuf
[100];
143 sk_getaddr(addr
, addrbuf
, 100);
144 buf
= dupprintf("Connecting to %s port %d", addrbuf
, port
);
145 logevent(rlogin
->frontend
, buf
);
148 rlogin
->s
= new_connection(addr
, *realhost
, port
, 1, 0,
149 nodelay
, (Plug
) rlogin
, cfg
);
150 if ((err
= sk_socket_error(rlogin
->s
)) != NULL
)
156 * Send local username, remote username, terminal/speed
162 sk_write(rlogin
->s
, &z
, 1);
163 sk_write(rlogin
->s
, cfg
->localusername
,
164 strlen(cfg
->localusername
));
165 sk_write(rlogin
->s
, &z
, 1);
166 sk_write(rlogin
->s
, cfg
->username
,
167 strlen(cfg
->username
));
168 sk_write(rlogin
->s
, &z
, 1);
169 sk_write(rlogin
->s
, cfg
->termtype
,
170 strlen(cfg
->termtype
));
171 sk_write(rlogin
->s
, "/", 1);
172 for (p
= cfg
->termspeed
; isdigit(*p
); p
++) continue;
173 sk_write(rlogin
->s
, cfg
->termspeed
, p
- cfg
->termspeed
);
174 rlogin
->bufsize
= sk_write(rlogin
->s
, &z
, 1);
180 static void rlogin_free(void *handle
)
182 Rlogin rlogin
= (Rlogin
) handle
;
190 * Stub routine (we don't have any need to reconfigure this backend).
192 static void rlogin_reconfig(void *handle
, Config
*cfg
)
197 * Called to send data down the rlogin connection.
199 static int rlogin_send(void *handle
, char *buf
, int len
)
201 Rlogin rlogin
= (Rlogin
) handle
;
203 if (rlogin
->s
== NULL
)
206 rlogin
->bufsize
= sk_write(rlogin
->s
, buf
, len
);
208 return rlogin
->bufsize
;
212 * Called to query the current socket sendability status.
214 static int rlogin_sendbuffer(void *handle
)
216 Rlogin rlogin
= (Rlogin
) handle
;
217 return rlogin
->bufsize
;
221 * Called to set the size of the window
223 static void rlogin_size(void *handle
, int width
, int height
)
225 Rlogin rlogin
= (Rlogin
) handle
;
226 char b
[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
228 rlogin
->term_width
= width
;
229 rlogin
->term_height
= height
;
231 if (rlogin
->s
== NULL
)
234 b
[6] = rlogin
->term_width
>> 8;
235 b
[7] = rlogin
->term_width
& 0xFF;
236 b
[4] = rlogin
->term_height
>> 8;
237 b
[5] = rlogin
->term_height
& 0xFF;
238 rlogin
->bufsize
= sk_write(rlogin
->s
, b
, 12);
243 * Send rlogin special codes.
245 static void rlogin_special(void *handle
, Telnet_Special code
)
251 static Socket
rlogin_socket(void *handle
)
253 Rlogin rlogin
= (Rlogin
) handle
;
257 static int rlogin_sendok(void *handle
)
259 /* Rlogin rlogin = (Rlogin) handle; */
263 static void rlogin_unthrottle(void *handle
, int backlog
)
265 Rlogin rlogin
= (Rlogin
) handle
;
266 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
269 static int rlogin_ldisc(void *handle
, int option
)
271 /* Rlogin rlogin = (Rlogin) handle; */
275 static void rlogin_provide_ldisc(void *handle
, void *ldisc
)
277 /* This is a stub. */
280 static void rlogin_provide_logctx(void *handle
, void *logctx
)
282 /* This is a stub. */
285 static int rlogin_exitcode(void *handle
)
287 /* Rlogin rlogin = (Rlogin) handle; */
288 /* If we ever implement RSH, we'll probably need to do this properly */
292 Backend rlogin_backend
= {
304 rlogin_provide_ldisc
,
305 rlogin_provide_logctx
,