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 buf = dupprintf("Looking up host \"%s\"", host);
126 logevent(rlogin->frontend, buf);
129 addr = name_lookup(host, port, realhost);
130 if ((err = sk_addr_error(addr)) != NULL)
134 port = 513; /* default rlogin port */
140 char *buf, addrbuf[100];
141 sk_getaddr(addr, addrbuf, 100);
142 buf = dupprintf("Connecting to %s port %d", addrbuf, port);
143 logevent(rlogin->frontend, buf);
146 rlogin->s = new_connection(addr, *realhost, port, 1, 0,
147 nodelay, (Plug) rlogin);
148 if ((err = sk_socket_error(rlogin->s)) != NULL)
154 * Send local username, remote username, terminal/speed
160 sk_write(rlogin->s, &z, 1);
161 sk_write(rlogin->s, cfg.localusername, strlen(cfg.localusername));
162 sk_write(rlogin->s, &z, 1);
163 sk_write(rlogin->s, cfg.username, strlen(cfg.username));
164 sk_write(rlogin->s, &z, 1);
165 sk_write(rlogin->s, cfg.termtype, strlen(cfg.termtype));
166 sk_write(rlogin->s, "/", 1);
167 for (p = cfg.termspeed; isdigit(*p); p++) continue;
168 sk_write(rlogin->s, cfg.termspeed, p - cfg.termspeed);
169 rlogin->bufsize = sk_write(rlogin->s, &z, 1);
176 * Called to send data down the rlogin connection.
178 static int rlogin_send(void *handle, char *buf, int len)
180 Rlogin rlogin = (Rlogin) handle;
182 if (rlogin->s == NULL)
185 rlogin->bufsize = sk_write(rlogin->s, buf, len);
187 return rlogin->bufsize;
191 * Called to query the current socket sendability status.
193 static int rlogin_sendbuffer(void *handle)
195 Rlogin rlogin = (Rlogin) handle;
196 return rlogin->bufsize;
200 * Called to set the size of the window
202 static void rlogin_size(void *handle, int width, int height)
204 Rlogin rlogin = (Rlogin) handle;
205 char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
207 rlogin->term_width = width;
208 rlogin->term_height = height;
210 if (rlogin->s == NULL)
213 b[6] = rlogin->term_width >> 8;
214 b[7] = rlogin->term_width & 0xFF;
215 b[4] = rlogin->term_height >> 8;
216 b[5] = rlogin->term_height & 0xFF;
217 rlogin->bufsize = sk_write(rlogin->s, b, 12);
222 * Send rlogin special codes.
224 static void rlogin_special(void *handle, Telnet_Special code)
230 static Socket rlogin_socket(void *handle)
232 Rlogin rlogin = (Rlogin) handle;
236 static int rlogin_sendok(void *handle)
238 /* Rlogin rlogin = (Rlogin) handle; */
242 static void rlogin_unthrottle(void *handle, int backlog)
244 Rlogin rlogin = (Rlogin) handle;
245 sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);
248 static int rlogin_ldisc(void *handle, int option)
250 /* Rlogin rlogin = (Rlogin) handle; */
254 static void rlogin_provide_ldisc(void *handle, void *ldisc)
256 /* This is a stub. */
259 static void rlogin_provide_logctx(void *handle, void *logctx)
261 /* This is a stub. */
264 static int rlogin_exitcode(void *handle)
266 /* Rlogin rlogin = (Rlogin) handle; */
267 /* If we ever implement RSH, we'll probably need to do this properly */
271 Backend rlogin_backend = {
281 rlogin_provide_ldisc,
282 rlogin_provide_logctx,