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 */
22 int term_width
, term_height
;
26 static void rlogin_size(void *handle
, int width
, int height
);
28 static void c_write(Rlogin rlogin
, char *buf
, int len
)
30 int backlog
= from_backend(rlogin
->frontend
, 0, buf
, len
);
31 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
34 static int rlogin_closing(Plug plug
, char *error_msg
, int error_code
,
37 Rlogin rlogin
= (Rlogin
) plug
;
43 /* A socket error has occurred. */
44 logevent(rlogin
->frontend
, error_msg
);
45 connection_fatal("%s", error_msg
);
46 } /* Otherwise, the remote side closed the connection normally. */
50 static int rlogin_receive(Plug plug
, int urgent
, char *data
, int len
)
52 Rlogin rlogin
= (Rlogin
) plug
;
59 rlogin_size(rlogin
, rlogin
->term_width
, rlogin
->term_height
);
61 * We should flush everything (aka Telnet SYNCH) if we see
62 * 0x02, and we should turn off and on _local_ flow control
63 * on 0x10 and 0x20 respectively. I'm not convinced it's
68 * Main rlogin protocol. This is really simple: the first
69 * byte is expected to be NULL and is ignored, and the rest
72 static int firstbyte
= 1;
74 if (data
[0] == '\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
,
101 char *host
, int port
, char **realhost
, int nodelay
)
103 static const struct plug_function_table fn_table
= {
112 rlogin
= smalloc(sizeof(*rlogin
));
113 rlogin
->fn
= &fn_table
;
115 rlogin
->frontend
= frontend_handle
;
116 rlogin
->term_width
= cfg
.width
;
117 rlogin
->term_height
= cfg
.height
;
118 *backend_handle
= rlogin
;
125 buf
= dupprintf("Looking up host \"%s\"", host
);
126 logevent(rlogin
->frontend
, buf
);
129 addr
= name_lookup(host
, port
, realhost
);
130 if ((err
= sk_addr_error(addr
)))
134 port
= 513; /* default rlogin port */
140 char *buf
, addrbuf
[100];
141 sk_getaddr(addr
, addrbuf
, 100);
142 buf
= dupprintf("Connecting to %s port %d", addrbuf
, port
);
143 logevent(rlogin
->frontend
, buf
);
146 rlogin
->s
= new_connection(addr
, *realhost
, port
, 1, 0,
147 nodelay
, (Plug
) rlogin
);
148 if ((err
= sk_socket_error(rlogin
->s
)))
154 * Send local username, remote username, terminal/speed
160 sk_write(rlogin
->s
, &z
, 1);
161 sk_write(rlogin
->s
, cfg
.localusername
, strlen(cfg
.localusername
));
162 sk_write(rlogin
->s
, &z
, 1);
163 sk_write(rlogin
->s
, cfg
.username
, strlen(cfg
.username
));
164 sk_write(rlogin
->s
, &z
, 1);
165 sk_write(rlogin
->s
, cfg
.termtype
, strlen(cfg
.termtype
));
166 sk_write(rlogin
->s
, "/", 1);
167 for (p
= cfg
.termspeed
; isdigit(*p
); p
++);
168 sk_write(rlogin
->s
, cfg
.termspeed
, p
- cfg
.termspeed
);
169 rlogin
->bufsize
= sk_write(rlogin
->s
, &z
, 1);
176 * Called to send data down the rlogin connection.
178 static int rlogin_send(void *handle
, char *buf
, int len
)
180 Rlogin rlogin
= (Rlogin
) handle
;
182 if (rlogin
->s
== NULL
)
185 rlogin
->bufsize
= sk_write(rlogin
->s
, buf
, len
);
187 return rlogin
->bufsize
;
191 * Called to query the current socket sendability status.
193 static int rlogin_sendbuffer(void *handle
)
195 Rlogin rlogin
= (Rlogin
) handle
;
196 return rlogin
->bufsize
;
200 * Called to set the size of the window
202 static void rlogin_size(void *handle
, int width
, int height
)
204 Rlogin rlogin
= (Rlogin
) handle
;
205 char b
[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
207 rlogin
->term_width
= width
;
208 rlogin
->term_height
= height
;
210 if (rlogin
->s
== NULL
)
213 b
[6] = rlogin
->term_width
>> 8;
214 b
[7] = rlogin
->term_width
& 0xFF;
215 b
[4] = rlogin
->term_height
>> 8;
216 b
[5] = rlogin
->term_height
& 0xFF;
217 rlogin
->bufsize
= sk_write(rlogin
->s
, b
, 12);
222 * Send rlogin special codes.
224 static void rlogin_special(void *handle
, Telnet_Special code
)
230 static Socket
rlogin_socket(void *handle
)
232 Rlogin rlogin
= (Rlogin
) handle
;
236 static int rlogin_sendok(void *handle
)
238 /* Rlogin rlogin = (Rlogin) handle; */
242 static void rlogin_unthrottle(void *handle
, int backlog
)
244 Rlogin rlogin
= (Rlogin
) handle
;
245 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
248 static int rlogin_ldisc(void *handle
, int option
)
250 /* Rlogin rlogin = (Rlogin) handle; */
254 static void rlogin_provide_ldisc(void *handle
, void *ldisc
)
256 /* This is a stub. */
259 static void rlogin_provide_logctx(void *handle
, void *logctx
)
261 /* This is a stub. */
264 static int rlogin_exitcode(void *handle
)
266 /* Rlogin rlogin = (Rlogin) handle; */
267 /* If we ever implement RSH, we'll probably need to do this properly */
271 Backend rlogin_backend
= {
281 rlogin_provide_ldisc
,
282 rlogin_provide_logctx
,