network/telnetd/state.c

32 static const char sccsid[] = "@(#)state.c	8.5 (Berkeley) 5/30/95";
78 #define	TS_DATA		0	/* base state */
94 	static int state = TS_DATA;
104 		switch (state) {
107 			state = TS_DATA;
116 				state = TS_IAC;
152 					state = TS_CR;
248 				state = TS_SB;
253 				state = TS_WILL;
257 				state = TS_WONT;
261 				state = TS_DO;
265 				state = TS_DONT;
292 			state = TS_DATA;
297 				state = TS_SE;
309 					 * damage to local state.  Parse
322 					state = TS_IAC;
326 				state = TS_SB;
335 				state = TS_DATA;
341 			state = TS_DATA;
346 			state = TS_DATA;
351 			state = TS_DATA;
356 			state = TS_DATA;
360 			syslog(LOG_ERR, "panic state=%d", state);
361 			printf("telnetd: panic state=%d\n", state);
368  * The will/wont/do/dont state machines are based on Dave Borman's
369  * Telnet option processing state machine.
372  *	my_state = the last negotiated state
373  *	want_state = what I want the state to go to
375  * All state defaults are negative, and resp defaults to 0.
377  * When initiating a request to change state to new_state:
410  * us not only the last negotiated state, but also tells us what the peer
412  * as we may wish to be processing data streams based on our desired state
413  * (want_state) or based on what the peer thinks the state is (my_state).
417  * by the positive state, and we can process it as such (if we can; if we
419  * peer probably should be buffering until this option state negotiation
513 			 * we leave the state WONT.
580 		 * state that we had requested.
599 			 * will cause us to process the new pty state
671 		/* it is always ok to change to negative state */
702 			 * as is.  Short circut the state machine to
1508 	 * We check the want_state rather than the current state,
1511 	 * in response to our WONT/DONT, then the "state" will be