The server crashes if it's not run with sudo

[arnaudoff]

Executing

{ "start-sniffer": { "interfaces": ["wlp3s0"], "shared": ["foo"], "filters": ["ip"] } }

leads to

[2017-01-04 21:20:36] [connect] WebSocket Connection [::1]:38982 v13  / 101
terminate called after throwing an instance of 'sniffer::core::SnifferException'
  what():  Couldn't open device wlp3s0: wlp3s0: You don't have permission to capture on that device (socket: Operation not permitted)

Thread 2 sniffer received signal SIGABRT, Aborted.
[Switching to Thread 0x7ffff553e700 (LWP 14951)]
0x00007ffff6b6704f in raise () from /usr/lib/libc.so.6

when the sniffer executable is run without root privileges.