13 #define RAW_MAX_BACKLOG 4096
15 typedef struct raw_backend_data {
16 const struct plug_function_table *fn;
17 /* the above field _must_ be first in the structure */
24 static void raw_size(void *handle, int width, int height);
26 static void c_write(Raw raw, char *buf, int len)
28 int backlog = from_backend(raw->frontend, 0, buf, len);
29 sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG);
32 static int raw_closing(Plug plug, const char *error_msg, int error_code,
40 notify_remote_exit(raw->frontend);
43 /* A socket error has occurred. */
44 logevent(raw->frontend, error_msg);
45 connection_fatal(raw->frontend, "%s", error_msg);
46 } /* Otherwise, the remote side closed the connection normally. */
50 static int raw_receive(Plug plug, int urgent, char *data, int len)
53 c_write(raw, data, len);
57 static void raw_sent(Plug plug, int bufsize)
60 raw->bufsize = bufsize;
64 * Called to set up the raw connection.
66 * Returns an error message, or NULL on success.
68 * Also places the canonical host name into `realhost'. It must be
69 * freed by the caller.
71 static const char *raw_init(void *frontend_handle, void **backend_handle,
73 char *host, int port, char **realhost, int nodelay,
76 static const struct plug_function_table fn_table = {
85 raw = snew(struct raw_backend_data);
88 *backend_handle = raw;
90 raw->frontend = frontend_handle;
97 buf = dupprintf("Looking up host \"%s\"", host);
98 logevent(raw->frontend, buf);
101 addr = name_lookup(host, port, realhost, cfg);
102 if ((err = sk_addr_error(addr)) != NULL) {
108 port = 23; /* default telnet port */
114 char *buf, addrbuf[100];
115 sk_getaddr(addr, addrbuf, 100);
116 buf = dupprintf("Connecting to %s port %d", addrbuf, port);
117 logevent(raw->frontend, buf);
120 raw->s = new_connection(addr, *realhost, port, 0, 1, nodelay, keepalive,
122 if ((err = sk_socket_error(raw->s)) != NULL)
128 static void raw_free(void *handle)
130 Raw raw = (Raw) handle;
138 * Stub routine (we don't have any need to reconfigure this backend).
140 static void raw_reconfig(void *handle, Config *cfg)
145 * Called to send data down the raw connection.
147 static int raw_send(void *handle, char *buf, int len)
149 Raw raw = (Raw) handle;
154 raw->bufsize = sk_write(raw->s, buf, len);
160 * Called to query the current socket sendability status.
162 static int raw_sendbuffer(void *handle)
164 Raw raw = (Raw) handle;
169 * Called to set the size of the window
171 static void raw_size(void *handle, int width, int height)
178 * Send raw special codes.
180 static void raw_special(void *handle, Telnet_Special code)
187 * Return a list of the special codes that make sense in this
190 static const struct telnet_special *raw_get_specials(void *handle)
195 static Socket raw_socket(void *handle)
197 Raw raw = (Raw) handle;
201 static int raw_sendok(void *handle)
206 static void raw_unthrottle(void *handle, int backlog)
208 Raw raw = (Raw) handle;
209 sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG);
212 static int raw_ldisc(void *handle, int option)
214 if (option == LD_EDIT || option == LD_ECHO)
219 static void raw_provide_ldisc(void *handle, void *ldisc)
221 /* This is a stub. */
224 static void raw_provide_logctx(void *handle, void *logctx)
226 /* This is a stub. */
229 static int raw_exitcode(void *handle)
231 Raw raw = (Raw) handle;
233 return -1; /* still connected */
235 /* Exit codes are a meaningless concept in the Raw protocol */
239 Backend raw_backend = {