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common: Add notes about how MAC is generated

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tschettervictor
2025-01-24 07:33:19 -07:00
committed by GitHub
parent 10c82964e3
commit 2c45c51e84
1 changed files with 3 additions and 2 deletions
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5
usr/local/share/bastille/common.sh
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@@ -228,8 +228,9 @@ generate_static_mac() {
local jail_name="${1}"
local external_interface="${2}"
local external_interface_mac="$(ifconfig ${external_interface} | grep ether | awk '{print $2}')"
# Use FreeBSD vendor prefix for jail MAC prefix
# Use FreeBSD vendor MAC prefix (58:9c:fc) for jail MAC prefix
local macaddr_prefix="58:9c:fc"
# Use hash of interface+jailname for jail MAC suffix
local macaddr_suffix="$(echo -n "${external_interface_mac}${jail_name}" | sed 's#:##g' | sha256 | cut -b -5 | sed 's/\([0-9a-fA-F][0-9a-fA-F]\)\([0-9a-fA-F][0-9a-fA-F]\)\([0-9a-fA-F]\)/\1:\2:\3/')"
if [ -z "${macaddr_prefix}" ] || [ -z "${macaddr_suffix}" ]; then
error_notify "Failed to generate MAC address."
@@ -364,4 +365,4 @@ checkyesno() {
return 1
;;
esac
}
}