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Avoid printing duplicate ALPN protocol if server forces one

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This commit is contained in:
dmiller 2018-09-08 23:14:02 +00:00
parent e1cbd13f82
commit 7b880da871
1 changed files with 5 additions and 1 deletions
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6
scripts/tls-alpn.nse
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@ -178,6 +178,7 @@ action = function(host, port)
}
local chosen = {}
local unique = {}
while next(alpn_protos) do
-- Send crafted client hello
local status, response = client_hello(host, port, alpn_protos)
@ -192,7 +193,10 @@ action = function(host, port)
if i > 1 then
stdnse.verbose1("Server violates RFC: sent additional protocol %s", p)
else
chosen[#chosen+1] = p
if not unique[p] then
chosen[#chosen+1] = p
end
unique[p] = true
if not find_and_remove(alpn_protos, p) then
stdnse.debug1("Chosen ALPN protocol %s was not offered", p)
-- Server is forcing this protocol, no need to continue offering.