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Description of problem:
tshark does not create a new file, if file specified with -w option does not exist, instead exits with
tshark: The file to which the capture would be saved ("<file>") could not be opened: Permission denied.
and returns 1
Version-Release number of selected component (if applicable):
wireshark-1.6.8-1.el7.x86_64
How reproducible:
always
Steps to Reproduce:
1. tshark -i <interface> -w <file that does not yet exist>
Expected results:
File with the given name is created
I suspect that you're trying to create a file in /root, and /root has 550 permissions. That needs DAC override capabilities even with EUID=0, and we don't want to keep these (because they're strongly root-equivalent).
Workaround is to use:
# tshark -w - > /root/foo
I think this should be closed with WONTFIX.
In theory, it should be possible to use setresuid/setresgid to swap real and effective IDs, open the output file, swap them back (possibly regaining root privileges), and the continue as before (drop the unused capabilities etc.).
Description of problem: tshark does not create a new file, if file specified with -w option does not exist, instead exits with tshark: The file to which the capture would be saved ("<file>") could not be opened: Permission denied. and returns 1 Version-Release number of selected component (if applicable): wireshark-1.6.8-1.el7.x86_64 How reproducible: always Steps to Reproduce: 1. tshark -i <interface> -w <file that does not yet exist> Expected results: File with the given name is created