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 */
24 int term_width, term_height;
28 static void rlogin_size(void *handle, int width, int height);
30 static void c_write(Rlogin rlogin, char *buf, int len)
32 int backlog = from_backend(rlogin->frontend, 0, buf, len);
33 sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);
36 static void rlogin_log(Plug plug, int type, SockAddr addr, int port,
37 const char *error_msg, int error_code)
39 Rlogin rlogin = (Rlogin) plug;
40 char addrbuf[256], *msg;
42 sk_getaddr(addr, addrbuf, lenof(addrbuf));
45 msg = dupprintf("Connecting to %s port %d", addrbuf, port);
47 msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg);
49 logevent(rlogin->frontend, msg);
52 static int rlogin_closing(Plug plug, const char *error_msg, int error_code,
55 Rlogin rlogin = (Rlogin) plug;
59 notify_remote_exit(rlogin->frontend);
62 /* A socket error has occurred. */
63 logevent(rlogin->frontend, error_msg);
64 connection_fatal(rlogin->frontend, "%s", error_msg);
65 } /* Otherwise, the remote side closed the connection normally. */
69 static int rlogin_receive(Plug plug, int urgent, char *data, int len)
71 Rlogin rlogin = (Rlogin) plug;
79 rlogin_size(rlogin, rlogin->term_width, rlogin->term_height);
82 * We should flush everything (aka Telnet SYNCH) if we see
83 * 0x02, and we should turn off and on _local_ flow control
84 * on 0x10 and 0x20 respectively. I'm not convinced it's
89 * Main rlogin protocol. This is really simple: the first
90 * byte is expected to be NULL and is ignored, and the rest
93 if (rlogin->firstbyte) {
94 if (data[0] == '\0') {
98 rlogin->firstbyte = 0;
101 c_write(rlogin, data, len);
106 static void rlogin_sent(Plug plug, int bufsize)
108 Rlogin rlogin = (Rlogin) plug;
109 rlogin->bufsize = bufsize;
113 * Called to set up the rlogin connection.
115 * Returns an error message, or NULL on success.
117 * Also places the canonical host name into `realhost'. It must be
118 * freed by the caller.
120 static const char *rlogin_init(void *frontend_handle, void **backend_handle,
122 char *host, int port, char **realhost,
123 int nodelay, int keepalive)
125 static const struct plug_function_table fn_table = {
135 rlogin = snew(struct rlogin_tag);
136 rlogin->fn = &fn_table;
138 rlogin->frontend = frontend_handle;
139 rlogin->term_width = cfg->width;
140 rlogin->term_height = cfg->height;
141 rlogin->firstbyte = 1;
143 *backend_handle = rlogin;
150 buf = dupprintf("Looking up host \"%s\"%s", host,
151 (cfg->addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" :
152 (cfg->addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" :
154 logevent(rlogin->frontend, buf);
157 addr = name_lookup(host, port, realhost, cfg, cfg->addressfamily);
158 if ((err = sk_addr_error(addr)) != NULL) {
164 port = 513; /* default rlogin port */
169 rlogin->s = new_connection(addr, *realhost, port, 1, 0,
170 nodelay, keepalive, (Plug) rlogin, cfg);
171 if ((err = sk_socket_error(rlogin->s)) != NULL)
175 * Send local username, remote username, terminal/speed
181 sk_write(rlogin->s, &z, 1);
182 sk_write(rlogin->s, cfg->localusername,
183 strlen(cfg->localusername));
184 sk_write(rlogin->s, &z, 1);
185 sk_write(rlogin->s, cfg->username,
186 strlen(cfg->username));
187 sk_write(rlogin->s, &z, 1);
188 sk_write(rlogin->s, cfg->termtype,
189 strlen(cfg->termtype));
190 sk_write(rlogin->s, "/", 1);
191 for (p = cfg->termspeed; isdigit((unsigned char)*p); p++) continue;
192 sk_write(rlogin->s, cfg->termspeed, p - cfg->termspeed);
193 rlogin->bufsize = sk_write(rlogin->s, &z, 1);
199 static void rlogin_free(void *handle)
201 Rlogin rlogin = (Rlogin) handle;
209 * Stub routine (we don't have any need to reconfigure this backend).
211 static void rlogin_reconfig(void *handle, Config *cfg)
216 * Called to send data down the rlogin connection.
218 static int rlogin_send(void *handle, char *buf, int len)
220 Rlogin rlogin = (Rlogin) handle;
222 if (rlogin->s == NULL)
225 rlogin->bufsize = sk_write(rlogin->s, buf, len);
227 return rlogin->bufsize;
231 * Called to query the current socket sendability status.
233 static int rlogin_sendbuffer(void *handle)
235 Rlogin rlogin = (Rlogin) handle;
236 return rlogin->bufsize;
240 * Called to set the size of the window
242 static void rlogin_size(void *handle, int width, int height)
244 Rlogin rlogin = (Rlogin) handle;
245 char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
247 rlogin->term_width = width;
248 rlogin->term_height = height;
250 if (rlogin->s == NULL || !rlogin->cansize)
253 b[6] = rlogin->term_width >> 8;
254 b[7] = rlogin->term_width & 0xFF;
255 b[4] = rlogin->term_height >> 8;
256 b[5] = rlogin->term_height & 0xFF;
257 rlogin->bufsize = sk_write(rlogin->s, b, 12);
262 * Send rlogin special codes.
264 static void rlogin_special(void *handle, Telnet_Special code)
271 * Return a list of the special codes that make sense in this
274 static const struct telnet_special *rlogin_get_specials(void *handle)
279 static Socket rlogin_socket(void *handle)
281 Rlogin rlogin = (Rlogin) handle;
285 static int rlogin_sendok(void *handle)
287 /* Rlogin rlogin = (Rlogin) handle; */
291 static void rlogin_unthrottle(void *handle, int backlog)
293 Rlogin rlogin = (Rlogin) handle;
294 sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG);
297 static int rlogin_ldisc(void *handle, int option)
299 /* Rlogin rlogin = (Rlogin) handle; */
303 static void rlogin_provide_ldisc(void *handle, void *ldisc)
305 /* This is a stub. */
308 static void rlogin_provide_logctx(void *handle, void *logctx)
310 /* This is a stub. */
313 static int rlogin_exitcode(void *handle)
315 Rlogin rlogin = (Rlogin) handle;
316 if (rlogin->s != NULL)
317 return -1; /* still connected */
319 /* If we ever implement RSH, we'll probably need to do this properly */
324 * cfg_info for rlogin does nothing at all.
326 static int rlogin_cfg_info(void *handle)
331 Backend rlogin_backend = {
344 rlogin_provide_ldisc,
345 rlogin_provide_logctx,