18 #define RAW_MAX_BACKLOG 4096
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20 typedef struct raw_backend_data {
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21 const struct plug_function_table *fn;
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22 /* the above field _must_ be first in the structure */
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25 int closed_on_socket_error;
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28 int sent_console_eof, sent_socket_eof;
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31 static void raw_size(void *handle, int width, int height);
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33 static void c_write(Raw raw, char *buf, int len)
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35 int backlog = from_backend(raw->frontend, 0, buf, len);
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36 sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG);
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39 static void raw_log(Plug plug, int type, SockAddr addr, int port,
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40 const char *error_msg, int error_code)
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42 Raw raw = (Raw) plug;
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43 char addrbuf[256], *msg;
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45 sk_getaddr(addr, addrbuf, lenof(addrbuf));
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48 msg = dupprintf("Connecting to %s port %d", addrbuf, port);
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50 msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg);
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52 logevent(raw->frontend, msg);
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56 static void raw_check_close(Raw raw)
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59 * Called after we send EOF on either the socket or the console.
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60 * Its job is to wind up the session once we have sent EOF on both.
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62 if (raw->sent_console_eof && raw->sent_socket_eof) {
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66 notify_remote_exit(raw->frontend);
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71 static int raw_closing(Plug plug, const char *error_msg, int error_code,
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74 Raw raw = (Raw) plug;
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77 /* A socket error has occurred. */
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81 raw->closed_on_socket_error = TRUE;
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82 notify_remote_exit(raw->frontend);
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84 logevent(raw->frontend, error_msg);
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85 connection_fatal(raw->frontend, "%s", error_msg);
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87 /* Otherwise, the remote side closed the connection normally. */
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88 if (!raw->sent_console_eof && from_backend_eof(raw->frontend)) {
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90 * The front end wants us to close the outgoing side of the
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91 * connection as soon as we see EOF from the far end.
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93 if (!raw->sent_socket_eof) {
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95 sk_write_eof(raw->s);
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96 raw->sent_socket_eof= TRUE;
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99 raw->sent_console_eof = TRUE;
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100 raw_check_close(raw);
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105 static int raw_receive(Plug plug, int urgent, char *data, int len)
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107 Raw raw = (Raw) plug;
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108 c_write(raw, data, len);
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112 static void raw_sent(Plug plug, int bufsize)
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114 Raw raw = (Raw) plug;
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115 raw->bufsize = bufsize;
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119 * Called to set up the raw connection.
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121 * Returns an error message, or NULL on success.
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123 * Also places the canonical host name into `realhost'. It must be
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124 * freed by the caller.
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126 static const char *raw_init(void *frontend_handle, void **backend_handle,
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128 char *host, int port, char **realhost, int nodelay,
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131 static const struct plug_function_table fn_table = {
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143 raw = snew(struct raw_backend_data);
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144 raw->fn = &fn_table;
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146 raw->closed_on_socket_error = FALSE;
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147 *backend_handle = raw;
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148 raw->sent_console_eof = raw->sent_socket_eof = FALSE;
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150 raw->frontend = frontend_handle;
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152 addressfamily = conf_get_int(conf, CONF_addressfamily);
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154 * Try to find host.
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158 buf = dupprintf("Looking up host \"%s\"%s", host,
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159 (addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" :
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160 (addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" :
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162 logevent(raw->frontend, buf);
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165 addr = name_lookup(host, port, realhost, conf, addressfamily);
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166 if ((err = sk_addr_error(addr)) != NULL) {
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167 sk_addr_free(addr);
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172 port = 23; /* default telnet port */
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177 raw->s = new_connection(addr, *realhost, port, 0, 1, nodelay, keepalive,
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179 if ((err = sk_socket_error(raw->s)) != NULL)
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182 loghost = conf_get_str(conf, CONF_loghost);
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187 *realhost = dupstr(loghost);
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188 colon = strrchr(*realhost, ':');
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191 * FIXME: if we ever update this aspect of ssh.c for
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192 * IPv6 literal management, this should change in line
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202 static void raw_free(void *handle)
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204 Raw raw = (Raw) handle;
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212 * Stub routine (we don't have any need to reconfigure this backend).
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214 static void raw_reconfig(void *handle, Conf *conf)
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219 * Called to send data down the raw connection.
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221 static int raw_send(void *handle, char *buf, int len)
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223 Raw raw = (Raw) handle;
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225 if (raw->s == NULL)
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228 raw->bufsize = sk_write(raw->s, buf, len);
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230 return raw->bufsize;
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234 * Called to query the current socket sendability status.
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236 static int raw_sendbuffer(void *handle)
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238 Raw raw = (Raw) handle;
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239 return raw->bufsize;
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243 * Called to set the size of the window
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245 static void raw_size(void *handle, int width, int height)
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252 * Send raw special codes. We only handle outgoing EOF here.
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254 static void raw_special(void *handle, Telnet_Special code)
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256 Raw raw = (Raw) handle;
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257 if (code == TS_EOF && raw->s) {
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258 sk_write_eof(raw->s);
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259 raw->sent_socket_eof= TRUE;
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260 raw_check_close(raw);
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267 * Return a list of the special codes that make sense in this
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270 static const struct telnet_special *raw_get_specials(void *handle)
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275 static int raw_connected(void *handle)
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277 Raw raw = (Raw) handle;
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278 return raw->s != NULL;
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281 static int raw_sendok(void *handle)
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286 static void raw_unthrottle(void *handle, int backlog)
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288 Raw raw = (Raw) handle;
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289 sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG);
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292 static int raw_ldisc(void *handle, int option)
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294 if (option == LD_EDIT || option == LD_ECHO)
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299 static void raw_provide_ldisc(void *handle, void *ldisc)
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301 /* This is a stub. */
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304 static void raw_provide_logctx(void *handle, void *logctx)
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306 /* This is a stub. */
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309 static int raw_exitcode(void *handle)
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311 Raw raw = (Raw) handle;
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312 if (raw->s != NULL)
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313 return -1; /* still connected */
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314 else if (raw->closed_on_socket_error)
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315 return INT_MAX; /* a socket error counts as an unclean exit */
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317 /* Exit codes are a meaningless concept in the Raw protocol */
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322 * cfg_info for Raw does nothing at all.
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324 static int raw_cfg_info(void *handle)
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329 Backend raw_backend = {
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343 raw_provide_logctx,
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