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Shell Programming and Scripting
command invocation
Post 302607356 by daWonderer on Wednesday 14th of March 2012 08:09:06 AM
03-14-2012
command invocation
Hello,
I've tested something like this: tcpdump -r /tmp/out.out > /tmp/out.ra 2> /dev/null
works fine - there is no status message visible.
if I place in a bash-script this line: $(tcpdump -r /tmp/out.out > /tmp/out.ra 2> /dev/null)
I get status information on executing
. I also tried to assign result to var - doesn't work.
1. How does 'tcpdump' knows if script or user manually typed in command?
2. How to suppress these status lines I get from tcpdump when calling from script?
thanx in advance..
I've tested something like this: tcpdump -r /tmp/out.out > /tmp/out.ra 2> /dev/null
works fine - there is no status message visible.
if I place in a bash-script this line: $(tcpdump -r /tmp/out.out > /tmp/out.ra 2> /dev/null)
I get status information on executing
. I also tried to assign result to var - doesn't work.1. How does 'tcpdump' knows if script or user manually typed in command?
2. How to suppress these status lines I get from tcpdump when calling from script?
thanx in advance..
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LEARN ABOUT FREEBSD
enc
ENC(4) BSD Kernel Interfaces Manual ENC(4) NAME
enc -- Encapsulating Interface SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file: device enc DESCRIPTION
The enc interface is a software loopback mechanism that allows hosts or firewalls to filter ipsec(4) traffic using any firewall package that hooks in via the pfil(9) framework. The enc interface allows an administrator to see incoming and outgoing packets before and after they will be or have been processed by ipsec(4) via tcpdump(1). The ``enc0'' interface inherits all IPsec traffic. Thus all IPsec traffic can be filtered based on ``enc0'', and all IPsec traffic could be seen by invoking tcpdump(1) on the ``enc0'' interface. What can be seen with tcpdump(1) and what will be passed on to the firewalls via the pfil(9) framework can be independently controlled using the following sysctl(8) variables: Name Defaults Suggested net.enc.out.ipsec_bpf_mask 0x00000003 0x00000001 net.enc.out.ipsec_filter_mask 0x00000001 0x00000001 net.enc.in.ipsec_bpf_mask 0x00000001 0x00000002 net.enc.in.ipsec_filter_mask 0x00000001 0x00000002 For the incoming path a value of 0x1 means ``before stripping off the outer header'' and 0x2 means ``after stripping off the outer header''. For the outgoing path 0x1 means ``with only the inner header'' and 0x2 means ``with outer and inner headers''. incoming path |------| ---- IPsec processing ---- (before) ---- (after) ----> | | | Host | <--- IPsec processing ---- (after) ----- (before) ---- | | outgoing path |------| Most people will want to run with the suggested defaults for ipsec_filter_mask and rely on the security policy database for the outer head- ers. EXAMPLES
To see the packets the processed via ipsec(4), adjust the sysctl(8) variables according to your need and run: tcpdump -i enc0 SEE ALSO
tcpdump(1), bpf(4), ipf(4), ipfw(4), ipsec(4), pf(4), tcpdump(8) BSD
November 28, 2007 BSD