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
;
32 static void rlogin_size(void *handle
, int width
, int height
);
34 static void c_write(Rlogin rlogin
, char *buf
, int len
)
36 int backlog
= from_backend(rlogin
->frontend
, 0, buf
, len
);
37 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
40 static void rlogin_log(Plug plug
, int type
, SockAddr addr
, int port
,
41 const char *error_msg
, int error_code
)
43 Rlogin rlogin
= (Rlogin
) plug
;
44 char addrbuf
[256], *msg
;
46 sk_getaddr(addr
, addrbuf
, lenof(addrbuf
));
49 msg
= dupprintf("Connecting to %s port %d", addrbuf
, port
);
51 msg
= dupprintf("Failed to connect to %s: %s", addrbuf
, error_msg
);
53 logevent(rlogin
->frontend
, msg
);
56 static int rlogin_closing(Plug plug
, const char *error_msg
, int error_code
,
59 Rlogin rlogin
= (Rlogin
) plug
;
63 notify_remote_exit(rlogin
->frontend
);
66 /* A socket error has occurred. */
67 logevent(rlogin
->frontend
, error_msg
);
68 connection_fatal(rlogin
->frontend
, "%s", error_msg
);
69 } /* Otherwise, the remote side closed the connection normally. */
73 static int rlogin_receive(Plug plug
, int urgent
, char *data
, int len
)
75 Rlogin rlogin
= (Rlogin
) plug
;
83 rlogin_size(rlogin
, rlogin
->term_width
, rlogin
->term_height
);
86 * We should flush everything (aka Telnet SYNCH) if we see
87 * 0x02, and we should turn off and on _local_ flow control
88 * on 0x10 and 0x20 respectively. I'm not convinced it's
93 * Main rlogin protocol. This is really simple: the first
94 * byte is expected to be NULL and is ignored, and the rest
97 if (rlogin
->firstbyte
) {
98 if (data
[0] == '\0') {
102 rlogin
->firstbyte
= 0;
105 c_write(rlogin
, data
, len
);
110 static void rlogin_sent(Plug plug
, int bufsize
)
112 Rlogin rlogin
= (Rlogin
) plug
;
113 rlogin
->bufsize
= bufsize
;
117 * Called to set up the rlogin connection.
119 * Returns an error message, or NULL on success.
121 * Also places the canonical host name into `realhost'. It must be
122 * freed by the caller.
124 static const char *rlogin_init(void *frontend_handle
, void **backend_handle
,
126 char *host
, int port
, char **realhost
,
127 int nodelay
, int keepalive
)
129 static const struct plug_function_table fn_table
= {
139 rlogin
= snew(struct rlogin_tag
);
140 rlogin
->fn
= &fn_table
;
142 rlogin
->frontend
= frontend_handle
;
143 rlogin
->term_width
= cfg
->width
;
144 rlogin
->term_height
= cfg
->height
;
145 rlogin
->firstbyte
= 1;
147 *backend_handle
= rlogin
;
154 buf
= dupprintf("Looking up host \"%s\"%s", host
,
155 (cfg
->addressfamily
== ADDRTYPE_IPV4 ?
" (IPv4)" :
156 (cfg
->addressfamily
== ADDRTYPE_IPV6 ?
" (IPv6)" :
158 logevent(rlogin
->frontend
, buf
);
161 addr
= name_lookup(host
, port
, realhost
, cfg
, cfg
->addressfamily
);
162 if ((err
= sk_addr_error(addr
)) != NULL
) {
168 port
= 513; /* default rlogin port */
173 rlogin
->s
= new_connection(addr
, *realhost
, port
, 1, 0,
174 nodelay
, keepalive
, (Plug
) rlogin
, cfg
);
175 if ((err
= sk_socket_error(rlogin
->s
)) != NULL
)
179 * Send local username, remote username, terminal/speed
185 sk_write(rlogin
->s
, &z
, 1);
186 sk_write(rlogin
->s
, cfg
->localusername
,
187 strlen(cfg
->localusername
));
188 sk_write(rlogin
->s
, &z
, 1);
189 sk_write(rlogin
->s
, cfg
->username
,
190 strlen(cfg
->username
));
191 sk_write(rlogin
->s
, &z
, 1);
192 sk_write(rlogin
->s
, cfg
->termtype
,
193 strlen(cfg
->termtype
));
194 sk_write(rlogin
->s
, "/", 1);
195 for (p
= cfg
->termspeed
; isdigit((unsigned char)*p
); p
++) continue;
196 sk_write(rlogin
->s
, cfg
->termspeed
, p
- cfg
->termspeed
);
197 rlogin
->bufsize
= sk_write(rlogin
->s
, &z
, 1);
203 static void rlogin_free(void *handle
)
205 Rlogin rlogin
= (Rlogin
) handle
;
213 * Stub routine (we don't have any need to reconfigure this backend).
215 static void rlogin_reconfig(void *handle
, Config
*cfg
)
220 * Called to send data down the rlogin connection.
222 static int rlogin_send(void *handle
, char *buf
, int len
)
224 Rlogin rlogin
= (Rlogin
) handle
;
226 if (rlogin
->s
== NULL
)
229 rlogin
->bufsize
= sk_write(rlogin
->s
, buf
, len
);
231 return rlogin
->bufsize
;
235 * Called to query the current socket sendability status.
237 static int rlogin_sendbuffer(void *handle
)
239 Rlogin rlogin
= (Rlogin
) handle
;
240 return rlogin
->bufsize
;
244 * Called to set the size of the window
246 static void rlogin_size(void *handle
, int width
, int height
)
248 Rlogin rlogin
= (Rlogin
) handle
;
249 char b
[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
251 rlogin
->term_width
= width
;
252 rlogin
->term_height
= height
;
254 if (rlogin
->s
== NULL
|| !rlogin
->cansize
)
257 b
[6] = rlogin
->term_width
>> 8;
258 b
[7] = rlogin
->term_width
& 0xFF;
259 b
[4] = rlogin
->term_height
>> 8;
260 b
[5] = rlogin
->term_height
& 0xFF;
261 rlogin
->bufsize
= sk_write(rlogin
->s
, b
, 12);
266 * Send rlogin special codes.
268 static void rlogin_special(void *handle
, Telnet_Special code
)
275 * Return a list of the special codes that make sense in this
278 static const struct telnet_special
*rlogin_get_specials(void *handle
)
283 static int rlogin_connected(void *handle
)
285 Rlogin rlogin
= (Rlogin
) handle
;
286 return rlogin
->s
!= NULL
;
289 static int rlogin_sendok(void *handle
)
291 /* Rlogin rlogin = (Rlogin) handle; */
295 static void rlogin_unthrottle(void *handle
, int backlog
)
297 Rlogin rlogin
= (Rlogin
) handle
;
298 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
301 static int rlogin_ldisc(void *handle
, int option
)
303 /* Rlogin rlogin = (Rlogin) handle; */
307 static void rlogin_provide_ldisc(void *handle
, void *ldisc
)
309 /* This is a stub. */
312 static void rlogin_provide_logctx(void *handle
, void *logctx
)
314 /* This is a stub. */
317 static int rlogin_exitcode(void *handle
)
319 Rlogin rlogin
= (Rlogin
) handle
;
320 if (rlogin
->s
!= NULL
)
321 return -1; /* still connected */
323 /* If we ever implement RSH, we'll probably need to do this properly */
328 * cfg_info for rlogin does nothing at all.
330 static int rlogin_cfg_info(void *handle
)
335 Backend rlogin_backend
= {
348 rlogin_provide_ldisc
,
349 rlogin_provide_logctx
,