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add support for static mac address for jails

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This commit will generate a static MAC address for each jail, based on the name of the jail. It will use the first half (xx:xx:xx) of the host MAC to avoid network clashes, and generate a random HEX string from the hashed name of the jail. It will then add that random 5 character HEX string in MAC format, and add an "a" and "b" for the host and jail respectively. 

This way a jail can retain it's MAC ID even if it is deleted and reinstalled, as long as the same name is retained.
This commit is contained in:
tschettervictor
2024-10-08 16:21:28 -06:00
committed by GitHub
parent cee6f20aa5
commit 0961165d36
1 changed files with 5 additions and 0 deletions
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5
usr/local/share/bastille/common.sh
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@@ -94,6 +94,9 @@ generate_vnet_jail_netblock() {
local uniq_epair="bastille0"
local uniq_epair_bridge="0"
fi
# generate static MAC for jail using host prefix (first half of host MAC)
local host_mac_prefix="$(ifconfig ${external_interface} | grep ether | awk '{print $2}' | cut -d':' -f1-3)"
local jail_mac_suffix="$(echo -n ${jail_name} | sha256 | tr -d '\n' | awk '{print substr($0,length($0)-5,2) ":" substr($0,length($0)-3,2) ":" substr($0,length($0)-1,1)}')"
if [ -n "${use_unique_bridge}" ]; then
## generate bridge config
cat <<-EOF
@@ -103,6 +106,8 @@ generate_vnet_jail_netblock() {
exec.prestart += "ifconfig ${external_interface} addm epair${uniq_epair_bridge}a";
exec.prestart += "ifconfig epair${uniq_epair_bridge}a up name e${uniq_epair_bridge}a_${jail_name}";
exec.prestart += "ifconfig epair${uniq_epair_bridge}b up name e${uniq_epair_bridge}b_${jail_name}";
exec.prestart += "ifconfig e${uniq_epair_bridge}a_${jail_name} ether ${host_mac_prefix}:${jail_mac_suffix}a";
exec.prestart += "ifconfig e${uniq_epair_bridge}b_${jail_name} ether ${host_mac_prefix}:${jail_mac_suffix}b";
exec.poststop += "ifconfig ${external_interface} deletem e${uniq_epair_bridge}a_${jail_name}";
exec.poststop += "ifconfig e${uniq_epair_bridge}a_${jail_name} destroy";
EOF