base-files: add macaddr_canonicalize helper function

[openwrt.git] / package / base-files / files / lib / functions.sh

diff --git a/package/base-files/files/lib/functions.sh b/package/base-files/files/lib/functions.sh
index 6cb6df9..85ebc2a 100755 (executable)
--- a/package/base-files/files/lib/functions.sh
+++ b/package/base-files/files/lib/functions.sh
@@ -257,7 +257,7 @@ mtd_get_mac_ascii()
        mac_dirty=$(strings "$part" | sed -n 's/^'"$key"'=//p')
 
        # "canonicalize" mac
-       [ -n "$mac_dirty" ] && echo ${mac_dirty} | tr [A-F] [a-f]
+       [ -n "$mac_dirty" ] && macaddr_canonicalize "$mac_dirty"
 }
 
 mtd_get_mac_binary() {
@@ -310,6 +310,39 @@ macaddr_2bin()
        echo -ne \\x${mac//:/\\x}
 }
 
+macaddr_canonicalize()
+{
+       local mac="$1"
+       local canon=""
+
+       [ ${#mac} -gt 17 ] && return
+       [ -n "${mac//[a-fA-F0-9\.: -]/}" ] && return
+
+       for octet in ${mac//[\.:-]/ }; do
+               case "${#octet}" in
+               1)
+                       octet="0${octet}"
+                       ;;
+               2)
+                       ;;
+               4)
+                       octet="${octet:0:2} ${octet:2:2}"
+                       ;;
+               12)
+                       octet="${octet:0:2} ${octet:2:2} ${octet:4:2} ${octet:6:2} ${octet:8:2} ${octet:10:2}"
+                       ;;
+               *)
+                       return
+                       ;;
+               esac
+               canon=${canon}${canon:+ }${octet}
+       done
+
+       [ ${#canon} -ne 17 ] && return
+
+       printf "%02x:%02x:%02x:%02x:%02x:%02x" 0x${canon// / 0x} 2>/dev/null
+}
+
 strtok() { # <string> { <variable> [<separator>] ... }
        local tmp
        local val="$1"