Using an interface alias

finto can serve credentials to clients by binding to an interface alias. While this does require finto be run as root (as it will listen on port 80), it is quick and simple to setup.

First, create and confirm your alias:

$ ifconfig lo:0 169.254.169.254 up # on Linux
$ ifconfig lo:0
lo:0: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
    inet 169.254.169.254  netmask 255.255.0.0
    loop  txqueuelen 0  (Local Loopback)
$ ping -c1 -t1 169.254.169.254 >/dev/null && echo success
success

Or, on OSX:

$ ifconfig lo0 alias 169.254.169.254 # on OSX
$ ifconfig lo0
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
options=3<RXCSUM,TXCSUM>
inet6 ::1 prefixlen 128
inet 127.0.0.1 netmask 0xff000000
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
nd6 options=1<PERFORMNUD>
$ ping -c1 -t1 169.254.169.254 >/dev/null && echo success
success

Then run finto:

$ sudo finto -port 80 -config /home/demo/.fintorc