Interface grouping is available on FreeBSD and OpenBSD. This will allow
you to enumerate only SoftEther virtual interfaces or exclude SoftEther
virtual interfaces, and be helpful when making custom scripts to start
DHCP client when virtual interface become up (=VPN connection
established) for example.
Usage examples as follows.
List all interfaces' names available on the system:
```
$ ifconfig -l
vtnet0 lo0 vpn_client0 vpn_client1 vpn_client2
```
Display a list of SoftEther virtual interfaces:
```
$ ifconfig -g softether
vpn_client0
vpn_client1
vpn_client2
```
Display details about SoftEther virtual interfaces that are up:
```
$ ifconfig -a -u -g softether
vpn_client0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
description: SoftEther Virtual Network Adapter
options=80000<LINKSTATE>
ether 5e:71:fa:f8:91:4a
hwaddr 58:9c:fc:10:34:2a
groups: tap softether
media: Ethernet autoselect
status: active
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
Opened by PID 1445
```
Display details about interfaces except for SoftEther virtual interfaces:
```
$ ifconfig -a -G softether
vtnet0: flags=8863<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=80028<VLAN_MTU,JUMBO_MTU,LINKSTATE>
ether 58:9c:fc:00:f0:23
inet6 fe80::5a9c:fcff:fe00:f023%vtnet0 prefixlen 64 scopeid 0x1
inet 192.168.96.7 netmask 0xffffff00 broadcast 192.168.96.255
media: Ethernet autoselect (10Gbase-T <full-duplex>)
status: active
nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
inet 127.0.0.1 netmask 0xff000000
groups: lo
nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
```
In contrast to Linux, FreeBSD's tap devices are still plumbed after fd
closed. The tap device must be destroyed in addition to closing fd
to delete virtual network interfaces used for VPN connection.
NicDelete command now works properly and virtual network interfaces used
by vpnclient are cleaned up when shutting down vpnclient.
found by coverity
CID 343528 (#1 of 1): Dereference before null check (REVERSE_INULL)
check_after_deref: Null-checking name suggests that it may be null,
but it has already been dereferenced on all paths leading to the
check.
438 if (name == NULL || k == NULL || k->private_key == false)
439 {
440 sec->Error = SEC_ERROR_BAD_PARAMETER;
441 return false;
442 }
found by coverity
CID 343537 (#1 of 1): Dereference before null check (REVERSE_INULL)
check_after_deref: Null-checking name suggests that it may be null
but it has already been dereferenced on all paths leading to the
check.
664 if (name == NULL)
665 {
666 sec->Error = SEC_ERROR_BAD_PARAMETER;
667 return false;
668 }
found by coverity
CID 343536 (#1 of 1): Dereference before null check (REVERSE_INULL)
check_after_deref: Null-checking name suggests that it may be null, but
it has already been dereferenced on all paths leading to the check.
1339 if (name == NULL || data == NULL || size == 0)
1340 {
1341 sec->Error = SEC_ERROR_BAD_PARAMETER;
1342 return false;
1343 }
