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-rw-r--r--appl/telnet/telnet.state80
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diff --git a/appl/telnet/telnet.state b/appl/telnet/telnet.state
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--- a/appl/telnet/telnet.state
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-
- Three pieces of state need to be kept for each side of each option.
- (You need the localside, sending WILL/WONT & receiving DO/DONT, and
- the remoteside, sending DO/DONT and receiving WILL/WONT)
-
- MY_STATE: What state am I in?
- WANT_STATE: What state do I want?
- WANT_RESP: How many requests have I initiated?
-
- Default values:
- MY_STATE = WANT_STATE = DONT
- WANT_RESP = 0
-
- The local setup will change based on the state of the Telnet
- variables. When we are the originator, we can either make the
- local setup changes at option request time (in which case if
- the option is denied we need to change things back) or when
- the option is acknowledged.
-
- To initiate a switch to NEW_STATE:
-
- if ((WANT_RESP == 0 && NEW_STATE == MY_STATE) ||
- WANT_STATE == NEW_STATE) {
- do nothing;
- } else {
- /*
- * This is where the logic goes to change the local setup
- * if we are doing so at request initiation
- */
- WANT_STATE = NEW_STATE;
- send NEW_STATE;
- WANT_RESP += 1;
- }
-
- When receiving NEW_STATE:
-
- if (WANT_RESP) {
- --WANT_RESP;
- if (WANT_RESP && (NEW_STATE == MY_STATE))
- --WANT_RESP;
- }
- if (WANT_RESP == 0) {
- if (NEW_STATE != WANT_STATE) {
- /*
- * This is where the logic goes to decide if it is ok
- * to switch to NEW_STATE, and if so, do any necessary
- * local setup changes.
- */
- if (ok_to_switch_to NEW_STATE)
- WANT_STATE = NEW_STATE;
- else
- WANT_RESP++;
-* if (MY_STATE != WANT_STATE)
- reply with WANT_STATE;
- } else {
- /*
- * This is where the logic goes to change the local setup
- * if we are doing so at request acknowledgment
- */
- }
- }
- MY_STATE = NEW_STATE;
-
-* This if() line is not needed, it should be ok to always do the
- "reply with WANT_STATE". With the if() line, asking to turn on
- an option that the other side doesn't understand is:
- Send DO option
- Recv WONT option
- Without the if() line, it is:
- Send DO option
- Recv WONT option
- Send DONT option
- If the other side does not expect to receive the latter case,
- but generates the latter case, then there is a potential for
- option negotiation loops. An implementation that does not expect
- to get the second case should not generate it, an implementation
- that does expect to get it may or may not generate it, and things
- will still work. Being conservative in what we send, we have the
- if() statement in, but we expect the other side to generate the
- last response.