tcpdump broken

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gmesmer
DD-WRT Novice


Joined: 19 Sep 2019
Posts: 12
PostPosted: Wed Mar 18, 2020 2:02    Post subject: tcpdump broken Reply with quote
Router/Version: Linksys EA6500 V1
Mode: ap + wan disabled + samba
Kernel:
Linux 3.19.108-d10


Attempting to execute tcpdump after installing through entware shows errors

Error relocating /opt/lib/libpcap.so.1: getnetbyname_r: symbol not found
Error relocating /opt/lib/libpcap.so.1: getprotobyname_r: symbol not found

Currently there are other posts on the forum dating back to January without solutions of this problem hidden within the individual build update threads.

Linksys EA6500 V1
Firmware: DD-WRT v3.0-r42681 giga (3/13/20)
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kernel-panic69
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Joined: 08 May 2018
Posts: 7977
Location: Texas, USA
PostPosted: Wed Mar 18, 2020 2:37    Post subject: Reply with quote
You have to install the libpcap package via Entware. I'm surprised it didn't resolve that dependency. This is not a firmware problem, this is a user / Entware problem.
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gmesmer
DD-WRT Novice


Joined: 19 Sep 2019
Posts: 12
PostPosted: Wed Mar 18, 2020 3:05    Post subject: Reply with quote
Actually I have installed the libpcap library via Entware as well. The more I look into it it seems like the Entware library/build for libpcap or tcpdump must be out of date or incompatible with dd-wrt.

libpcap.so.1 is located in /opt/lib
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kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 7977
Location: Texas, USA
PostPosted: Wed Mar 18, 2020 3:50    Post subject: Reply with quote
Probably a kernel version issue. May have to use the .ipk files from here:

https://archive.openwrt.org/barrier_breaker/14.07/brcm47xx/mips74k/packages/base/
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