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 void rlogin_log(Plug plug
, int type
, SockAddr addr
, int port
,
36 const char *error_msg
, int error_code
)
38 Rlogin rlogin
= (Rlogin
) plug
;
39 char addrbuf
[256], *msg
;
41 sk_getaddr(addr
, addrbuf
, lenof(addrbuf
));
44 msg
= dupprintf("Connecting to %s port %d", addrbuf
, port
);
46 msg
= dupprintf("Failed to connect to %s: %s", addrbuf
, error_msg
);
48 logevent(rlogin
->frontend
, msg
);
51 static int rlogin_closing(Plug plug
, const char *error_msg
, int error_code
,
54 Rlogin rlogin
= (Rlogin
) plug
;
58 notify_remote_exit(rlogin
->frontend
);
61 /* A socket error has occurred. */
62 logevent(rlogin
->frontend
, error_msg
);
63 connection_fatal(rlogin
->frontend
, "%s", error_msg
);
64 } /* Otherwise, the remote side closed the connection normally. */
68 static int rlogin_receive(Plug plug
, int urgent
, char *data
, int len
)
70 Rlogin rlogin
= (Rlogin
) plug
;
77 rlogin_size(rlogin
, rlogin
->term_width
, rlogin
->term_height
);
79 * We should flush everything (aka Telnet SYNCH) if we see
80 * 0x02, and we should turn off and on _local_ flow control
81 * on 0x10 and 0x20 respectively. I'm not convinced it's
86 * Main rlogin protocol. This is really simple: the first
87 * byte is expected to be NULL and is ignored, and the rest
90 if (rlogin
->firstbyte
) {
91 if (data
[0] == '\0') {
95 rlogin
->firstbyte
= 0;
98 c_write(rlogin
, data
, len
);
103 static void rlogin_sent(Plug plug
, int bufsize
)
105 Rlogin rlogin
= (Rlogin
) plug
;
106 rlogin
->bufsize
= bufsize
;
110 * Called to set up the rlogin connection.
112 * Returns an error message, or NULL on success.
114 * Also places the canonical host name into `realhost'. It must be
115 * freed by the caller.
117 static const char *rlogin_init(void *frontend_handle
, void **backend_handle
,
119 char *host
, int port
, char **realhost
,
120 int nodelay
, int keepalive
)
122 static const struct plug_function_table fn_table
= {
132 rlogin
= snew(struct rlogin_tag
);
133 rlogin
->fn
= &fn_table
;
135 rlogin
->frontend
= frontend_handle
;
136 rlogin
->term_width
= cfg
->width
;
137 rlogin
->term_height
= cfg
->height
;
138 rlogin
->firstbyte
= 1;
139 *backend_handle
= rlogin
;
146 buf
= dupprintf("Looking up host \"%s\"%s", host
,
147 (cfg
->addressfamily
== ADDRTYPE_IPV4 ?
" (IPv4)" :
148 (cfg
->addressfamily
== ADDRTYPE_IPV6 ?
" (IPv6)" :
150 logevent(rlogin
->frontend
, buf
);
153 addr
= name_lookup(host
, port
, realhost
, cfg
, cfg
->addressfamily
);
154 if ((err
= sk_addr_error(addr
)) != NULL
) {
160 port
= 513; /* default rlogin port */
165 rlogin
->s
= new_connection(addr
, *realhost
, port
, 1, 0,
166 nodelay
, keepalive
, (Plug
) rlogin
, cfg
);
167 if ((err
= sk_socket_error(rlogin
->s
)) != NULL
)
171 * Send local username, remote username, terminal/speed
177 sk_write(rlogin
->s
, &z
, 1);
178 sk_write(rlogin
->s
, cfg
->localusername
,
179 strlen(cfg
->localusername
));
180 sk_write(rlogin
->s
, &z
, 1);
181 sk_write(rlogin
->s
, cfg
->username
,
182 strlen(cfg
->username
));
183 sk_write(rlogin
->s
, &z
, 1);
184 sk_write(rlogin
->s
, cfg
->termtype
,
185 strlen(cfg
->termtype
));
186 sk_write(rlogin
->s
, "/", 1);
187 for (p
= cfg
->termspeed
; isdigit((unsigned char)*p
); p
++) continue;
188 sk_write(rlogin
->s
, cfg
->termspeed
, p
- cfg
->termspeed
);
189 rlogin
->bufsize
= sk_write(rlogin
->s
, &z
, 1);
195 static void rlogin_free(void *handle
)
197 Rlogin rlogin
= (Rlogin
) handle
;
205 * Stub routine (we don't have any need to reconfigure this backend).
207 static void rlogin_reconfig(void *handle
, Config
*cfg
)
212 * Called to send data down the rlogin connection.
214 static int rlogin_send(void *handle
, char *buf
, int len
)
216 Rlogin rlogin
= (Rlogin
) handle
;
218 if (rlogin
->s
== NULL
)
221 rlogin
->bufsize
= sk_write(rlogin
->s
, buf
, len
);
223 return rlogin
->bufsize
;
227 * Called to query the current socket sendability status.
229 static int rlogin_sendbuffer(void *handle
)
231 Rlogin rlogin
= (Rlogin
) handle
;
232 return rlogin
->bufsize
;
236 * Called to set the size of the window
238 static void rlogin_size(void *handle
, int width
, int height
)
240 Rlogin rlogin
= (Rlogin
) handle
;
241 char b
[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
243 rlogin
->term_width
= width
;
244 rlogin
->term_height
= height
;
246 if (rlogin
->s
== NULL
)
249 b
[6] = rlogin
->term_width
>> 8;
250 b
[7] = rlogin
->term_width
& 0xFF;
251 b
[4] = rlogin
->term_height
>> 8;
252 b
[5] = rlogin
->term_height
& 0xFF;
253 rlogin
->bufsize
= sk_write(rlogin
->s
, b
, 12);
258 * Send rlogin special codes.
260 static void rlogin_special(void *handle
, Telnet_Special code
)
267 * Return a list of the special codes that make sense in this
270 static const struct telnet_special
*rlogin_get_specials(void *handle
)
275 static Socket
rlogin_socket(void *handle
)
277 Rlogin rlogin
= (Rlogin
) handle
;
281 static int rlogin_sendok(void *handle
)
283 /* Rlogin rlogin = (Rlogin) handle; */
287 static void rlogin_unthrottle(void *handle
, int backlog
)
289 Rlogin rlogin
= (Rlogin
) handle
;
290 sk_set_frozen(rlogin
->s
, backlog
> RLOGIN_MAX_BACKLOG
);
293 static int rlogin_ldisc(void *handle
, int option
)
295 /* Rlogin rlogin = (Rlogin) handle; */
299 static void rlogin_provide_ldisc(void *handle
, void *ldisc
)
301 /* This is a stub. */
304 static void rlogin_provide_logctx(void *handle
, void *logctx
)
306 /* This is a stub. */
309 static int rlogin_exitcode(void *handle
)
311 Rlogin rlogin
= (Rlogin
) handle
;
312 if (rlogin
->s
!= NULL
)
313 return -1; /* still connected */
315 /* If we ever implement RSH, we'll probably need to do this properly */
320 * cfg_info for rlogin does nothing at all.
322 static int rlogin_cfg_info(void *handle
)
327 Backend rlogin_backend
= {
340 rlogin_provide_ldisc
,
341 rlogin_provide_logctx
,