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,
101 char *host, int port, char **realhost, int nodelay)
103 static const struct plug_function_table fn_table = {
112 rlogin = smalloc(sizeof(*rlogin));
113 rlogin->fn = &fn_table;
115 rlogin->frontend = frontend_handle;
116 rlogin->term_width = cfg.width;
117 rlogin->term_height = cfg.height;
118 *backend_handle = rlogin;
125 sprintf(buf, "Looking up host \"%.170s\"", host);
126 logevent(rlogin->frontend, buf);
128 addr = sk_namelookup(host, realhost);
129 if ((err = sk_addr_error(addr)))
133 port = 513; /* default rlogin port */
139 char buf[200], addrbuf[100];
140 sk_getaddr(addr, addrbuf, 100);
141 sprintf(buf, "Connecting to %.100s port %d", addrbuf, port);
142 logevent(rlogin->frontend, buf);
144 rlogin->s = new_connection(addr, *realhost, port, 1, 0,
145 nodelay, (Plug) rlogin);
146 if ((err = sk_socket_error(rlogin->s)))
152 * Send local username, remote username, terminal/speed
158 sk_write(rlogin->s, &z, 1);
159 sk_write(rlogin->s, cfg.localusername, strlen(cfg.localusername));
160 sk_write(rlogin->s, &z, 1);
161 sk_write(rlogin->s, cfg.username, strlen(cfg.username));
162 sk_write(rlogin->s, &z, 1);
163 sk_write(rlogin->s, cfg.termtype, strlen(cfg.termtype));
164 sk_write(rlogin->s, "/", 1);
165 for (p = cfg.termspeed; isdigit(*p); p++);
166 sk_write(rlogin->s, cfg.termspeed, p - cfg.termspeed);
167 rlogin->bufsize = sk_write(rlogin->s, &z, 1);
174 * Called to send data down the rlogin connection.
176 static int rlogin_send(void *handle, char *buf, int len)
178 Rlogin rlogin = (Rlogin) handle;
180 if (rlogin->s == NULL)
183 rlogin->bufsize = sk_write(rlogin->s, buf, len);
185 return rlogin->bufsize;
189 * Called to query the current socket sendability status.
191 static int rlogin_sendbuffer(void *handle)
193 Rlogin rlogin = (Rlogin) handle;
194 return rlogin->bufsize;
198 * Called to set the size of the window
200 static void rlogin_size(void *handle, int width, int height)
202 Rlogin rlogin = (Rlogin) handle;
203 char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
205 rlogin->term_width = width;
206 rlogin->term_height = height;
208 if (rlogin->s == NULL)
211 b[6] = rlogin->term_width >> 8;
212 b[7] = rlogin->term_width & 0xFF;
213 b[4] = rlogin->term_height >> 8;
214 b[5] = rlogin->term_height & 0xFF;
215 rlogin->bufsize = sk_write(rlogin->s, b, 12);
220 * Send rlogin special codes.
222 static void rlogin_special(void *handle, Telnet_Special code)
228 static Socket rlogin_socket(void *handle)
230 Rlogin rlogin = (Rlogin) handle;
234 static int rlogin_sendok(void *handle)
236 /* Rlogin rlogin = (Rlogin) handle; */
240 static void rlogin_unthrottle(void *handle, int backlog)
242 Rlogin rlogin = (Rlogin) handle;
243 sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);
246 static int rlogin_ldisc(void *handle, int option)
248 /* Rlogin rlogin = (Rlogin) handle; */
252 static void rlogin_provide_ldisc(void *handle, void *ldisc)
254 /* This is a stub. */
257 static void rlogin_provide_logctx(void *handle, void *logctx)
259 /* This is a stub. */
262 static int rlogin_exitcode(void *handle)
264 /* Rlogin rlogin = (Rlogin) handle; */
265 /* If we ever implement RSH, we'll probably need to do this properly */
269 Backend rlogin_backend = {
279 rlogin_provide_ldisc,
280 rlogin_provide_logctx,