network/telnetd/state.c

87 #define	TS_WILL		5	/* will option negotiation */
249 			 * Begin option subnegotiation...
277 			 * Handle RFC 10xx Telnet linemode option additions
338 				suboption();	/* handle sub-option */
373  * Telnet option processing state machine.
423  * peer probably should be buffering until this option state negotiation
428 send_do(int option, int init)
431 		if ((do_dont_resp[option] == 0 && his_state_is_will(option)) ||
432 		    his_want_state_is_will(option))
439 		if (option == TELOPT_TM)
440 			set_his_want_state_wont(option);
442 			set_his_want_state_will(option);
443 		do_dont_resp[option]++;
445 	output_data((const char *)doopt, option);
447 	DIAG(TD_OPTIONS, printoption("td: send do", option));
451 willoption(int option)
460 	DIAG(TD_OPTIONS, printoption("td: recv will", option));
462 	if (do_dont_resp[option]) {
463 		do_dont_resp[option]--;
464 		if (do_dont_resp[option] && his_state_is_will(option))
465 			do_dont_resp[option]--;
467 	if (do_dont_resp[option] == 0) {
468 	    if (his_want_state_is_wont(option)) {
469 		switch (option) {
524 			 * option, then don't worry peer that we can't
572 			set_his_want_state_will(option);
573 			send_do(option, 0);
575 			do_dont_resp[option]++;
576 			send_dont(option, 0);
584 		switch (option) {
591 			send_dont(option, 1);
637 	set_his_state_will(option);
643 send_dont(int option, int init)
646 		if ((do_dont_resp[option] == 0 && his_state_is_wont(option)) ||
647 		    his_want_state_is_wont(option))
649 		set_his_want_state_wont(option);
650 		do_dont_resp[option]++;
652 	output_data((const char *)dont, option);
654 	DIAG(TD_OPTIONS, printoption("td: send dont", option));
658 wontoption(int option)
664 	DIAG(TD_OPTIONS, printoption("td: recv wont", option));
666 	if (do_dont_resp[option]) {
667 		do_dont_resp[option]--;
668 		if (do_dont_resp[option] && his_state_is_wont(option))
669 			do_dont_resp[option]--;
671 	if (do_dont_resp[option] == 0) {
672 	    if (his_want_state_is_will(option)) {
674 		switch (option) {
713 			 * option, then let peer know that we can't
731 		 * option rather than responding to the request,
759 		set_his_want_state_wont(option);
760 		if (his_state_is_will(option))
761 			send_dont(option, 0);
763 		switch (option) {
785 	set_his_state_wont(option);
790 send_will(int option, int init)
793 		if ((will_wont_resp[option] == 0 && my_state_is_will(option))||
794 		    my_want_state_is_will(option))
796 		set_my_want_state_will(option);
797 		will_wont_resp[option]++;
799 	output_data((const char *)will, option);
801 	DIAG(TD_OPTIONS, printoption("td: send will", option));
816 dooption(int option)
824 	DIAG(TD_OPTIONS, printoption("td: recv do", option));
826 	if (will_wont_resp[option]) {
827 		will_wont_resp[option]--;
828 		if (will_wont_resp[option] && my_state_is_will(option))
829 			will_wont_resp[option]--;
831 	if ((will_wont_resp[option] == 0) && (my_want_state_is_wont(option))) {
832 		switch (option) {
895 			send_will(option, 0);
896 			set_my_want_state_wont(option);
897 			set_my_state_wont(option);
902 			 * When we get a LOGOUT option, respond
934 			set_my_want_state_will(option);
935 			send_will(option, 0);
937 			will_wont_resp[option]++;
938 			send_wont(option, 0);
941 	set_my_state_will(option);
946 send_wont(int option, int init)
949 		if ((will_wont_resp[option] == 0 && my_state_is_wont(option)) ||
950 		    my_want_state_is_wont(option))
952 		set_my_want_state_wont(option);
953 		will_wont_resp[option]++;
955 	output_data((const char *)wont, option);
957 	DIAG(TD_OPTIONS, printoption("td: send wont", option));
961 dontoption(int option)
968 	DIAG(TD_OPTIONS, printoption("td: recv dont", option));
970 	if (will_wont_resp[option]) {
971 		will_wont_resp[option]--;
972 		if (will_wont_resp[option] && my_state_is_wont(option))
973 			will_wont_resp[option]--;
975 	if ((will_wont_resp[option] == 0) && (my_want_state_is_will(option))) {
976 		switch (option) {
1023 			set_my_want_state_wont(option);
1024 			if (my_state_is_will(option))
1025 				send_wont(option, 0);
1026 			set_my_state_wont(option);
1028 				send_will(option, 1);
1036 		set_my_want_state_wont(option);
1037 		if (my_state_is_will(option))
1038 			send_wont(option, 0);
1040 	set_my_state_wont(option);
1055  *	Look at the sub-option buffer, and try to be helpful to the other
1077 	if (his_state_is_wont(TELOPT_TSPEED))	/* Ignore if option disabled */
1101 	if (his_state_is_wont(TELOPT_TTYPE))	/* Ignore if option disabled */
1129 	if (his_state_is_wont(TELOPT_NAWS))	/* Ignore if option disabled */
1154 	if (his_state_is_wont(TELOPT_LINEMODE))	/* Ignore if option disabled */
1331 		 * If the client has sent us a well-formed option,
1511 	 * because if we received a DO/WILL for an option that we