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svc-t: Properly ignore TELNET subnegotiations

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This commit is contained in:
20kdc 2020-04-02 00:08:11 +01:00
parent 7c70a1128c
commit 3ed1cebe25
1 changed files with 14 additions and 3 deletions
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17
code/apps/svc-t.lua
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@ -155,6 +155,7 @@ end
local tvBuildingCmd = ""
local tvBuildingUTF = ""
local tvSubnegotiation = false
local function incoming(s)
tvBuildingCmd = tvBuildingCmd .. s
-- Flush Cmd
@ -168,7 +169,13 @@ local function incoming(s)
-- Command Lengths
if cmd >= 251 and cmd <= 254 then cmdLen = 3 end
if #tvBuildingCmd < cmdLen then break end
if cmd == 251 and param == 1 then
if cmd == 240 then
-- SE
tvSubnegotiation = false
elseif cmd == 250 then
-- SB
tvSubnegotiation = true
elseif cmd == 251 and param == 1 then
-- WILL ECHO (respond with DO ECHO, disable line editing)
-- test using io.write("\xFF\xFB\x01")
for _, v in pairs(sendSigs) do
@ -188,11 +195,15 @@ local function incoming(s)
v("telnet", res)
end
elseif cmd == 255 then
tvBuildingUTF = tvBuildingUTF .. "\xFF"
if not tvSubnegotiation then
tvBuildingUTF = tvBuildingUTF .. "\xFF"
end
end
tvBuildingCmd = tvBuildingCmd:sub(cmdLen + 1)
else
tvBuildingUTF = tvBuildingUTF .. tvBuildingCmd:sub(1, 1)
if not tvSubnegotiation then
tvBuildingUTF = tvBuildingUTF .. tvBuildingCmd:sub(1, 1)
end
tvBuildingCmd = tvBuildingCmd:sub(2)
end
end