SIGSEGV if tun device is present about local-ip-address HOT 4 CLOSED

Hello @zyddnys! Thanks for reporting this issue!
I'm checking on your error and I was able to reproduce it.

The invalid access occurs here:

The pointer ifa_addr is null, thus access to its fields is not valid, and when we attempt to access the sa_family field we receive SIGSEGV.

If you check for your network interfaces running:

ip link show

You will get this output:

# Network interfaces from your system..
8: tun0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 500
    link/none

Note that we don't have an address assigned to our tun0 interface, instead we have link/none in it's place.

sudo ip tuntap add tun0 mode tun

Solution Draft

I think I've to introduce support for network interfaces with no address.
So instead of having:

Vec<(String, IpAddr)>

For the list of network interfaces, we could have:

Vec<(String, Option<IpAddr>)>

Or perhaps, even more descriptive:

enum NetworkInterfaceAddress {
    AfInet,
    AfInet6,
}

struct NetworkInterface {
    name: String,
    ip_address: Option<IpAddr>,
    family: NetworkInterfaceFamily,
}

What do you think?

from local-ip-address.

Sounds great, thank you for the help

from local-ip-address.

Thanks to you! I will be working on this and get back to you when its ready!

from local-ip-address.

Hi @zyddnys, I hope you are doing well!
I've been discussing improvements to the API in #26, I would appreciate your suggestions there as we were talking about something similar here.

Take a look to this struct definition here:
#26 (comment)

Let me know your comments!

from local-ip-address.