[FS#3445] arp-scan not working in 19.07.4

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - ayrstone (ayrstone) 

Attached to Project - OpenWrt/LEDE Project
Summary - arp-scan not working in 19.07.4
Task Type - Bug Report
Category - Packages
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - openwrt-19.07
Due in Version - Undecided
Due Date - Undecided
Details - Upgrading OpenWRT from 18.06 to 19.07 on a couple of Alfa wireless devices (N2Q and Tube2H) and on Ubiquiti PicoStation M2, observed the following behavior in arp-scan:

Before upgrade (in 18.06):

# arp-scan -I br-lan -l
Interface: br-lan, datalink type: EN10MB (Ethernet)
WARNING: Cannot open MAC/Vendor file /usr/share/arp-scan/ieee-oui.txt: No such file or directory
WARNING: Cannot open MAC/Vendor file /usr/share/arp-scan/ieee-iab.txt: No such file or directory
WARNING: Cannot open MAC/Vendor file /usr/share/arp-scan/mac-vendor.txt: No such file or directory
Starting arp-scan 1.9.5 with 256 hosts (https://github.com/royhills/arp-scan)
172.22.47.1    de:9f:db:05:46:5d    (Unknown)
172.22.47.53    00:24:8c:9d:1d:92    (Unknown)
172.22.47.77    0c:ef:af:c4:f5:b5    (Unknown)
172.22.47.111    3c:2a:f4:b8:25:c2    (Unknown)
172.22.47.116    00:02:d1:43:e8:5b    (Unknown)
172.22.47.102    5c:e0:c5:67:1a:e2    (Unknown)
172.22.47.186    00:c0:ca:8d:4d:2c    (Unknown)
172.22.47.108    00:40:8c:a5:e8:03    (Unknown)
172.22.47.130    00:40:8c:be:b0:73    (Unknown)
172.22.47.161    d8:c4:97:e0:30:d1    (Unknown)
172.22.47.108    00:40:8c:a5:e8:03    (Unknown) (DUP: 2)
172.22.47.130    00:40:8c:be:b0:73    (Unknown) (DUP: 2)
172.22.47.132    2c:aa:8e:9a:3a:94    (Unknown) (DUP: 1)
172.22.47.161    d8:c4:97:e0:30:d1    (Unknown) (DUP: 2)

14 packets received by filter, 0 packets dropped by kernel
Ending arp-scan 1.9.5: 256 hosts scanned in 1.804 seconds (141.91 hosts/sec). 14 responded 

After upgrade (in 19.07):

# arp-scan -I br-lan -l
Interface: br-lan, datalink type: EN10MB (Ethernet)
WARNING: Cannot open MAC/Vendor file /usr/share/arp-scan/ieee-oui.txt: No such file or directory
WARNING: Cannot open MAC/Vendor file /usr/share/arp-scan/ieee-iab.txt: No such file or directory
WARNING: Cannot open MAC/Vendor file /usr/share/arp-scan/mac-vendor.txt: No such file or directory
Starting arp-scan 1.9.5 with 256 hosts (https://github.com/royhills/arp-scan)

20 packets received by filter, 0 packets dropped by kernel
Ending arp-scan 1.9.5: 256 hosts scanned in 1.823 seconds (140.43 hosts/sec). 0 responded 


Note that, while arp-scan has not changed version, libpcap1 has rev'ed from libpcap1 - 1.9.0-2 to libpcap1 - 1.9.1-2.1

To reproduce:

Connect a device running one of the 18.06 releases (I'm specifically using r9137-0465e41) and run arp-scan on an active network. Then connect a device running 19.07.4 and run arp-scan on the same network. 
   

 

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3445

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