Wireshark mailing list archives
Re: dumpcap permissions - Quick help for Ubuntu newbie needed
From: Wes <wes_r () yahoo com>
Date: Wed, 21 Mar 2012 04:58:16 -0700 (PDT)
Just so you know, your not alone, I get the same results as you... $ pwd /home/test $ $ sudo dumpcap -w test.pcap The file to which the capture would be saved ("test.pcap") could not be opened: Permission denied. $ $ sudo dumpcap -w /home/test/test.pcap The file to which the capture would be saved ("/home/test/test.pcap") could not be opened: Permission denied. $ I did go a step further and touched a test.pcap file. Still didn't work with these permissions: -rw-rw-r-- 1 test test 0 2012-03-21 08:00 test.pcap I then changed it to full rwx permissions and it worked: -rwxrwxrwx 1 test test 0 2012-03-21 08:00 test.pcap $ sudo dumpcap -w test.pcap File: test.pcap Packets captured: 18 Packets received/dropped on interface eth0: 26/0 $ I leave it to someone better at Linux than me to figure out why... Wes --- On Wed, 3/21/12, RUOFF, LARS (LARS)** CTR ** <lars.ruoff () alcatel-lucent com> wrote:
From: RUOFF, LARS (LARS)** CTR ** <lars.ruoff () alcatel-lucent com> Subject: Re: [Wireshark-users] dumpcap permissions - Quick help for Ubuntu newbie needed To: "Community support list for Wireshark" <wireshark-users () wireshark org> Date: Wednesday, March 21, 2012, 4:39 AM Ok, just for completeness so it might help others too, i need to be root AND in root's home dir to caputre: $ whoami dummy $ pwd /home/dummy $ dumpcap -w test.pcap dumpcap: There are no interfaces on which a capture can be done $ sudo dumpcap -w test.pcap [sudo] password for dummy: The file to which the capture would be saved ("test.pcap") could not be opened: Permission denied. $ su root Password: # whoami root # dumpcap -w test.pcap The file to which the capture would be saved ("test.pcap") could not be opened: Permission denied. # cd ~ # pwd /root # dumpcap -w test.pcap File: test.pcap Packets: 38 Packets: 76 ^C Packets: 93 Packets dropped: 0 Regards, Lars -----Original Message----- From: wireshark-users-bounces () wireshark org [mailto:wireshark-users-bounces () wireshark org] On Behalf Of Joerg Mayer Sent: mardi 20 mars 2012 17:33 To: Community support list for Wireshark Subject: Re: [Wireshark-users] dumpcap permissions - Quick help for Ubuntu newbie needed Hello Lars, On Tue, Mar 20, 2012 at 05:04:06PM +0100, RUOFF, LARS (LARS)** CTR ** wrote:On an Ubunutu 10.04, I tried to sudo dumpcap -w d1.pcap which gave me: The file to which the capture would be saved("d1.pcap") could not be opened: Permission denied.according to my naive Linux knowledge, i would haveexpected "sudo" to give me all the necessary permissions.What am i missing here?Maybe Ubuntu drops permissions once it has openend the capture devices. So the capture devices have been opened before dropping privileges but the output files were opened after dropping privileges. At least Debian does it like this when I call wireshark/tshark. Ciao Jörg -- Joerg Mayer <jmayer () loplof de> We are stuck with technology when what we really want is just stuff that works. Some say that should read Microsoft instead of technology. ___________________________________________________________________________ Sent via: Wireshark-users mailing list <wireshark-users () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-users Unsubscribe: https://wireshark.org/mailman/options/wireshark-users mailto:wireshark-users-request () wireshark org?subject=unsubscribe ___________________________________________________________________________ Sent via: Wireshark-users mailing list <wireshark-users () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-users Unsubscribe: https://wireshark.org/mailman/options/wireshark-users mailto:wireshark-users-request () wireshark org?subject=unsubscribe
___________________________________________________________________________ Sent via: Wireshark-users mailing list <wireshark-users () wireshark org> Archives: http://www.wireshark.org/lists/wireshark-users Unsubscribe: https://wireshark.org/mailman/options/wireshark-users mailto:wireshark-users-request () wireshark org?subject=unsubscribe
Current thread:
- dumpcap permissions - Quick help for Ubuntu newbie needed RUOFF, LARS (LARS)** CTR ** (Mar 20)
- Re: dumpcap permissions - Quick help for Ubuntu newbie needed Unuetzer, Christian (AMOS SE) (Mar 20)
- Re: dumpcap permissions - Quick help for Ubuntu newbie needed RUOFF, LARS (LARS)** CTR ** (Mar 20)
- Re: dumpcap permissions - Quick help for Ubuntu newbie needed Joerg Mayer (Mar 20)
- Re: dumpcap permissions - Quick help for Ubuntu newbie needed RUOFF, LARS (LARS)** CTR ** (Mar 21)
- Re: dumpcap permissions - Quick help for Ubuntu newbie needed Wes (Mar 21)
- Re: [Wireshark-users] dumpcap permissions - Quick help for Ubuntu newbie needed Christopher Maynard (Mar 21)
- Re: dumpcap permissions - Quick help for Ubuntu newbie needed RUOFF, LARS (LARS)** CTR ** (Mar 22)
- Re: dumpcap permissions - Quick help for Ubuntu newbie needed Tony Trinh (Mar 22)
- Re: dumpcap permissions - Quick help for Ubuntu newbie needed RUOFF, LARS (LARS)** CTR ** (Mar 20)
- Re: dumpcap permissions - Quick help for Ubuntu newbie needed Unuetzer, Christian (AMOS SE) (Mar 20)
- Re: dumpcap permissions - Quick help for Ubuntu newbie needed Unuetzer, Christian (AMOS SE) (Mar 21)