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Do a print_debug in ssh2.lua when an incomplete packet is processed.

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david
2009-06-14 17:52:47 +00:00
parent 845c3dfb2d
commit aef834cd12
1 changed files with 6 additions and 0 deletions
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6
nselib/ssh2.lua
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@@ -45,7 +45,13 @@ end
transport.payload = function( packet ) transport.payload = function( packet )
local packet_length, padding_length, payload_length, payload, offset local packet_length, padding_length, payload_length, payload, offset
offset, packet_length, padding_length = bin.unpack( ">Ic", packet ) offset, packet_length, padding_length = bin.unpack( ">Ic", packet )
assert(packet_length and padding_length)
payload_length = packet_length - padding_length - 1 payload_length = packet_length - padding_length - 1
-- Add 4 for the packet_length field.
if packet_length + 4 > packet:len() then
stdnse.print_debug("SSH-2 packet too short: payload_length is %d but total length is only %d.", packet_length, packet:len())
return nil
end
offset, payload = bin.unpack( ">A" .. payload_length, packet, offset ) offset, payload = bin.unpack( ">A" .. payload_length, packet, offset )
return payload return payload
end end