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Finished this a while ago, and it’s close to reaching wireshark trunk. The patch is available here. The TN5250 specs and whatnot are available here . I’ve also created a TN5250 reference page on the Wireshark Wiki . As a protocol, TN5250 is only marginally less bizarre than it’s daddy TN3270. Oddly, it was also harder to code for – maybe state machines were all the rage at the time but they make a dissector’s life much more fussy. In summary, yet another typing-trial by endurance. Still haven’t figured out my motivation for doing it!
My protocol analyser for the TN3270 protocol is now available in Wireshark. TN3270 is the protocol created by IBM in 1972 for a class of terminals normally used to communicate with IBM mainframes. There was a time when TN3270 accounted for a significant portion of the world’s network traffic and it is still widely used today – mainly because big iron just refuses to lie down and die. The omission from Wireshark of such an important protocol in the history of network communications always struck me as a little odd. So with the help of the trusty “3270 Information Display System: Data Stream Programmer’s Reference” (all 500 or so pages of it) I set to work. It rapidly became an exercise in typing, rather than coding. And the only reason I finished it was because I started it. Next up – TN5250.