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,
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 buf = dupprintf("Looking up host \"%s\"", host);
127 logevent(rlogin->frontend, buf);
130 addr = name_lookup(host, port, realhost);
131 if ((err = sk_addr_error(addr)) != NULL)
135 port = 513; /* default rlogin port */
141 char *buf, addrbuf[100];
142 sk_getaddr(addr, addrbuf, 100);
143 buf = dupprintf("Connecting to %s port %d", addrbuf, port);
144 logevent(rlogin->frontend, buf);
147 rlogin->s = new_connection(addr, *realhost, port, 1, 0,
148 nodelay, (Plug) rlogin);
149 if ((err = sk_socket_error(rlogin->s)) != NULL)
155 * Send local username, remote username, terminal/speed
161 sk_write(rlogin->s, &z, 1);
162 sk_write(rlogin->s, cfg->localusername,
163 strlen(cfg->localusername));
164 sk_write(rlogin->s, &z, 1);
165 sk_write(rlogin->s, cfg->username,
166 strlen(cfg->username));
167 sk_write(rlogin->s, &z, 1);
168 sk_write(rlogin->s, cfg->termtype,
169 strlen(cfg->termtype));
170 sk_write(rlogin->s, "/", 1);
171 for (p = cfg->termspeed; isdigit(*p); p++) continue;
172 sk_write(rlogin->s, cfg->termspeed, p - cfg->termspeed);
173 rlogin->bufsize = sk_write(rlogin->s, &z, 1);
180 * Stub routine (we don't have any need to reconfigure this backend).
182 static void rlogin_reconfig(void *handle, Config *cfg)
187 * Called to send data down the rlogin connection.
189 static int rlogin_send(void *handle, char *buf, int len)
191 Rlogin rlogin = (Rlogin) handle;
193 if (rlogin->s == NULL)
196 rlogin->bufsize = sk_write(rlogin->s, buf, len);
198 return rlogin->bufsize;
202 * Called to query the current socket sendability status.
204 static int rlogin_sendbuffer(void *handle)
206 Rlogin rlogin = (Rlogin) handle;
207 return rlogin->bufsize;
211 * Called to set the size of the window
213 static void rlogin_size(void *handle, int width, int height)
215 Rlogin rlogin = (Rlogin) handle;
216 char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
218 rlogin->term_width = width;
219 rlogin->term_height = height;
221 if (rlogin->s == NULL)
224 b[6] = rlogin->term_width >> 8;
225 b[7] = rlogin->term_width & 0xFF;
226 b[4] = rlogin->term_height >> 8;
227 b[5] = rlogin->term_height & 0xFF;
228 rlogin->bufsize = sk_write(rlogin->s, b, 12);
233 * Send rlogin special codes.
235 static void rlogin_special(void *handle, Telnet_Special code)
241 static Socket rlogin_socket(void *handle)
243 Rlogin rlogin = (Rlogin) handle;
247 static int rlogin_sendok(void *handle)
249 /* Rlogin rlogin = (Rlogin) handle; */
253 static void rlogin_unthrottle(void *handle, int backlog)
255 Rlogin rlogin = (Rlogin) handle;
256 sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);
259 static int rlogin_ldisc(void *handle, int option)
261 /* Rlogin rlogin = (Rlogin) handle; */
265 static void rlogin_provide_ldisc(void *handle, void *ldisc)
267 /* This is a stub. */
270 static void rlogin_provide_logctx(void *handle, void *logctx)
272 /* This is a stub. */
275 static int rlogin_exitcode(void *handle)
277 /* Rlogin rlogin = (Rlogin) handle; */
278 /* If we ever implement RSH, we'll probably need to do this properly */
282 Backend rlogin_backend = {
293 rlogin_provide_ldisc,
294 rlogin_provide_logctx,