Retrieve local ip independently

[bluedigits]

Since MacOS doesn't necessarily name the cabled network interface en0 the localip command fails when WI-FI is down. This PR should fix this issue and resolve the local ip properly when connected via cable.

[blaues0cke]

In my case this then returns the ip address of a random virtual machine:

This is what my ifconfig -a returns:

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
    options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP>
    inet 127.0.0.1 netmask 0xff000000
    inet6 ::1 prefixlen 128
    inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
    nd6 options=201<PERFORMNUD,DAD>
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
XHC20: flags=0<> mtu 0
VHC128: flags=0<> mtu 0
XHC1: flags=0<> mtu 0
XHC0: flags=0<> mtu 0
XHC3: flags=0<> mtu 0
XHC2: flags=0<> mtu 0
en7: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    options=b<RXCSUM,TXCSUM,VLAN_HWTAGGING>
    ether 58:ef:68:e7:2f:8c
    nd6 options=201<PERFORMNUD,DAD>
    media: autoselect (<unknown type>)
    status: inactive
en5: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    ether ac:de:48:00:11:22
    inet6 fe80::aede:48ff:fe00:1122%en5 prefixlen 64 scopeid 0xb
    nd6 options=201<PERFORMNUD,DAD>
    media: autoselect (100baseTX <full-duplex>)
    status: active
ap1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
    ether 3a:f9:d3:d5:89:4c
    media: autoselect
    status: inactive
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    ether 38:f9:d3:d5:89:4c
    inet6 fe80::1058:3f6:aeb3:d24c%en0 prefixlen 64 secured scopeid 0xd
    inet 192.168.0.226 netmask 0xffffff00 broadcast 192.168.0.255
    inet6 2a02:8070:e287:e800:41e:3b99:ce56:5644 prefixlen 64 autoconf secured
    inet6 2a02:8070:e287:e800:20c7:7639:be41:b758 prefixlen 64 autoconf temporary
    nd6 options=201<PERFORMNUD,DAD>
    media: autoselect
    status: active
p2p0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2304
    ether 0a:f9:d3:d5:89:4c
    media: autoselect
    status: inactive
awdl0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1484
    ether 4e:de:3e:bb:9d:12
    inet6 fe80::4cde:3eff:febb:9d12%awdl0 prefixlen 64 scopeid 0xf
    nd6 options=201<PERFORMNUD,DAD>
    media: autoselect
    status: active
en1: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
    options=60<TSO4,TSO6>
    ether fa:00:a4:69:8d:01
    media: autoselect <full-duplex>
    status: inactive
en2: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
    options=60<TSO4,TSO6>
    ether fa:00:a4:69:8d:00
    media: autoselect <full-duplex>
    status: inactive
en3: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
    options=60<TSO4,TSO6>
    ether fa:00:a4:69:8d:05
    media: autoselect <full-duplex>
    status: inactive
en4: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
    options=60<TSO4,TSO6>
    ether fa:00:a4:69:8d:04
    media: autoselect <full-duplex>
    status: inactive
bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    options=63<RXCSUM,TXCSUM,TSO4,TSO6>
    ether fa:00:a4:69:8d:01
    Configuration:
        id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0
        maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200
        root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0
        ipfilter disabled flags 0x2
    member: en1 flags=3<LEARNING,DISCOVER>
            ifmaxaddr 0 port 16 priority 0 path cost 0
    member: en2 flags=3<LEARNING,DISCOVER>
            ifmaxaddr 0 port 17 priority 0 path cost 0
    member: en3 flags=3<LEARNING,DISCOVER>
            ifmaxaddr 0 port 18 priority 0 path cost 0
    member: en4 flags=3<LEARNING,DISCOVER>
            ifmaxaddr 0 port 19 priority 0 path cost 0
    nd6 options=201<PERFORMNUD,DAD>
    media: <unknown type>
    status: inactive
utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000
    inet6 fe80::bacc:13c4:63ad:e348%utun0 prefixlen 64 scopeid 0x15
    nd6 options=201<PERFORMNUD,DAD>
vboxnet0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
    ether 0a:00:27:00:00:00
    inet 192.168.99.1 netmask 0xffffff00 broadcast 192.168.99.255
utun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
    inet6 fe80::f35a:3822:4c6e:2d62%utun1 prefixlen 64 scopeid 0x17
    nd6 options=201<PERFORMNUD,DAD>
utun2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
    inet6 fe80::348c:c953:6dad:2dc1%utun2 prefixlen 64 scopeid 0x18
    nd6 options=201<PERFORMNUD,DAD>
utun3: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
    inet6 fe80::a633:8b30:5941:edd5%utun3 prefixlen 64 scopeid 0x19
    nd6 options=201<PERFORMNUD,DAD>
utun4: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
    inet6 fe80::d6db:a371:6420:aada%utun4 prefixlen 64 scopeid 0x1a
    nd6 options=201<PERFORMNUD,DAD>

[bluedigits]

@blaues0cke Thanks for pointing this out! Let's find a better solution then. May I kindly ask you what

ifconfig | sed -En 's/127.0.0.1//;s/.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*/\2/p'

returns in your case?

[rprimus]

Sun Aug 18 15:14:40 BST 2019

I use:

ipconfig getifaddr $(netstat -rn | grep default | awk '{print $NF}' | head -1)

ifconfig | sed -En 's/127.0.0.1//;s/.inet (addr:)?(([0-9].){3}[0-9])./\2/p'

@bluedigits - the above does give the correct IP address for the active connection.

[blaues0cke]

@bluedigits this seems to work :-)

[bluedigits]

ipconfig getifaddr $(netstat -rn | grep default | awk '{print $NF}' | head -1)

@rprimus That works! Thanks for this great solution! :clap @blaues0cke indeed 💃

[bluedigits]

I added the localip command as a function to get around the eager substitution of the alias during shell start. Otherwise you would have to call reload in case you switch from WiFi to LAN or vice-versa.