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,
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)
137 port = 513; /* default rlogin port */
143 char *buf, addrbuf[100];
144 sk_getaddr(addr, addrbuf, 100);
145 buf = dupprintf("Connecting to %s port %d", addrbuf, port);
146 logevent(rlogin->frontend, buf);
149 rlogin->s = new_connection(addr, *realhost, port, 1, 0,
150 nodelay, (Plug) rlogin, cfg);
151 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,