From b7914344adb14c70348498a2196e96bb79dd52ca Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Thu, 14 Nov 2013 17:44:42 +0000
Subject: base-files: add macaddr_canonicalize helper function

In commit r38690, the MAC address canonicalization
has been converted to use 'tr' instead of 'printf'.
This only works if with MAC addresses which uses
the 'xx:xx:xx:xx:xx:xx' format.

However on some boards, the MAC addresses are stored
in different format in the mtd partition. Some vendors
are using hyphens or dots as separators instead of
colons. Also the leading zeroes may be missing from the
individual octets or those are replaced with spaces.

Add a new function which can be used to convert these
into the 'xx:xx:xx:xx:xx:xx' format. Also update the
'mtd_get_mac_ascii' function to use the new helper.

The helper function is based on this code:
  http://isquared.nl/blog/2010/08/11/Bash-function-to-canonicalize-MAC-addresses/

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 38803
---
 package/base-files/files/lib/functions.sh | 35 ++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

(limited to 'package/base-files/files/lib')

diff --git a/package/base-files/files/lib/functions.sh b/package/base-files/files/lib/functions.sh
index 6cb6df92fd..85ebc2aeb1 100755
--- 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"
-- 
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