Editing dumped file then client-replay

[virindh]

I am using mitmdump to dump some network activity. Then I use textedit on osx to edit then (literally changing one line), but when I try client replay it gives Could not load file: Invalid data format. How do I fix this???? I also tried simple replay w/o editing it and it gives the issue

[cortesi]

Sorry, you can't just edit the mitmdump files by hand. The data segment headers encode the length of the following data chunk. If you change a portion of it, and change the length, you've corrupted the file. So please treat the data dumps as binary data, just like a pcap dump. If you need to, you can edit the dump using mitmproxy, by reading the dump in, changing it in the interface, and then writing it to disk again.

[virindh]

I tried that too. Same thing. Invalid data format.

On Sep 20, 2012, at 9:55 PM, Aldo Cortesi notifications@github.com wrote:

Sorry, you can't just edit the mitmdump files by hand. The data segment
headers encode the length of the following data chunk. If you change a
portion of it, and change the length, you've corrupted the file. So please
treat the data dumps as binary data, just like a pcap dump. If you need to,
you can edit the dump using mitmproxy, by reading the dump in, changing it
in the interface, and then writing it to disk again.

—
Reply to this email directly or view it on
GitHubhttps://github.com/cortesi/mitmproxy/issues/63#issuecomment-8751545.

[cortesi]

OK. You'll have to give me a lot more information though. First, a step-by-step on how to reproduce the issue. Second, what platform you're running on, what version of mitmproxy you're using, etc.

[wimbledon]

I know how to modify the flow in mitmproxy, however, how do I read in the flow file, edit it and save it using libmproxy?

[mhils]

Hi @wimbledon,

you can read an existing dump file using mitmproxy -r dumpfile (optionall with -n). Having modified the flows, you can save them to a new file by pressing w -> a in the flow list.

Cheers,
Max