15 #define RLOGIN_MAX_BACKLOG 4096
17 typedef struct rlogin_tag {
18 const struct plug_function_table *fn;
19 /* 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 static int firstbyte = 1;
75 if (data[0] == '\0') {
82 c_write(rlogin, data, len);
87 static void rlogin_sent(Plug plug, int bufsize)
89 Rlogin rlogin = (Rlogin) plug;
90 rlogin->bufsize = bufsize;
94 * Called to set up the rlogin connection.
96 * Returns an error message, or NULL on success.
98 * Also places the canonical host name into `realhost'. It must be
99 * freed by the caller.
101 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 *backend_handle = rlogin;
126 sprintf(buf, "Looking up host \"%.170s\"", host);
127 logevent(rlogin->frontend, buf);
129 addr = sk_namelookup(host, realhost);
130 if ((err = sk_addr_error(addr)))
134 port = 513; /* default rlogin port */
140 char buf[200], addrbuf[100];
141 sk_getaddr(addr, addrbuf, 100);
142 sprintf(buf, "Connecting to %.100s port %d", addrbuf, port);
143 logevent(rlogin->frontend, buf);
145 rlogin->s = new_connection(addr, *realhost, port, 1, 0,
146 nodelay, (Plug) rlogin);
147 if ((err = sk_socket_error(rlogin->s)))
153 * Send local username, remote username, terminal/speed
159 sk_write(rlogin->s, &z, 1);
160 sk_write(rlogin->s, cfg.localusername, strlen(cfg.localusername));
161 sk_write(rlogin->s, &z, 1);
162 sk_write(rlogin->s, cfg.username, strlen(cfg.username));
163 sk_write(rlogin->s, &z, 1);
164 sk_write(rlogin->s, cfg.termtype, strlen(cfg.termtype));
165 sk_write(rlogin->s, "/", 1);
166 for (p = cfg.termspeed; isdigit(*p); p++);
167 sk_write(rlogin->s, cfg.termspeed, p - cfg.termspeed);
168 rlogin->bufsize = sk_write(rlogin->s, &z, 1);
175 * Called to send data down the rlogin connection.
177 static int rlogin_send(void *handle, char *buf, int len)
179 Rlogin rlogin = (Rlogin) handle;
181 if (rlogin->s == NULL)
184 rlogin->bufsize = sk_write(rlogin->s, buf, len);
186 return rlogin->bufsize;
190 * Called to query the current socket sendability status.
192 static int rlogin_sendbuffer(void *handle)
194 Rlogin rlogin = (Rlogin) handle;
195 return rlogin->bufsize;
199 * Called to set the size of the window
201 static void rlogin_size(void *handle, int width, int height)
203 Rlogin rlogin = (Rlogin) handle;
204 char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
206 rlogin->term_width = width;
207 rlogin->term_height = height;
209 if (rlogin->s == NULL)
212 b[6] = rlogin->term_width >> 8;
213 b[7] = rlogin->term_width & 0xFF;
214 b[4] = rlogin->term_height >> 8;
215 b[5] = rlogin->term_height & 0xFF;
216 rlogin->bufsize = sk_write(rlogin->s, b, 12);
221 * Send rlogin special codes.
223 static void rlogin_special(void *handle, Telnet_Special code)
229 static Socket rlogin_socket(void *handle)
231 Rlogin rlogin = (Rlogin) handle;
235 static int rlogin_sendok(void *handle)
237 Rlogin rlogin = (Rlogin) handle;
241 static void rlogin_unthrottle(void *handle, int backlog)
243 Rlogin rlogin = (Rlogin) handle;
244 sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);
247 static int rlogin_ldisc(void *handle, int option)
249 Rlogin rlogin = (Rlogin) handle;
253 static void rlogin_provide_ldisc(void *handle, void *ldisc)
255 /* This is a stub. */
258 static void rlogin_provide_logctx(void *handle, void *logctx)
260 /* This is a stub. */
263 static int rlogin_exitcode(void *handle)
265 Rlogin rlogin = (Rlogin) handle;
266 /* If we ever implement RSH, we'll probably need to do this properly */
270 Backend rlogin_backend = {
280 rlogin_provide_ldisc,
281 rlogin_provide_logctx,