X-Git-Url: http://git.harvie.cz/?a=blobdiff_plain;f=bash%2Fdhcp-option.sh;h=e5f825dda637900a6dcff57b076f4921b6e10a07;hb=46a7758b58eeff9b507e6e173b03b7fd909e22c3;hp=c9c5a76ee2d1bf4f8b11565d8d548e270dc42ae7;hpb=b118cefd1c56620cc1e2af8f4abf526b518b395f;p=mirrors%2FPrograms.git

diff --git a/bash/dhcp-option.sh b/bash/dhcp-option.sh
index c9c5a76..e5f825d 100755
--- a/bash/dhcp-option.sh
+++ b/bash/dhcp-option.sh
@@ -10,16 +10,23 @@ dec_to_hex_right() {
 }
 
 escape() {
+	#Adds \x escapes to hexdump string
+
 	while read -n 2 i; do
 		[ -n "$i" ] && echo -n '\x'"$i";
 	done
 }
 
 dnsmasq() {
+	#Converts \x00\x00 notation to 00:00 notation
+
 	sed -e 's/^\\x//g' | sed -e 's/\\x/:/g'
 }
 
 dhcp_option() {
+	#Compile DHCP option using option number and data.
+	#Generates hex string including header with option number and data length.
+
 	separator='\x'
 	option_id="$1"
 	option_data="$2"
@@ -30,13 +37,38 @@ dhcp_option() {
 	printf "$option_data" | xxd -ps -c 256 | escape
 }
 
+pd_prefix() {
+	#Generate prefix sub-option to be included in PD option of DHCPv6
+
+	option_id=26
+	lifetime_preferred='\x00\x00\x01\x2C'
+	lifetime_valid='\x00\x00\x01\x2C'
+
+	prefix_length='64'
+	#prefix = 16 octets:
+	prefix='\x20\x01\x06\x7c\x21\x90\x1a\x01''\x00\x00\x00\x00\x00\x00\x00\x00'
+
+	prefix_length_hex=$(dec_to_hex $prefix_length)
+
+	#echo $prefix_length_hex
+	dhcp_option $option_id "$lifetime_preferred$lifetime_valid$prefix_length_hex$prefix"
+}
+
 pd() {
-	option_id=25
+	#Generate data of PF option of DHCPv6
+
 	iaid='\x00\x00\x00\x00'
 	t1='\x00\x00\x01\x2C'
 	t2='\x00\x00\x01\x2C'
-	ia_pd_opts=''
-	dhcp_option $option_id "$iaid$t1$t2$id_pd_opts"
+	ia_pd_opts="$(pd_prefix)"
+	echo -n "$iaid$t1$t2$ia_pd_opts"
+}
+
+pd_option() {
+	#Generate PD option of DHCPv6 (including header)
+
+	option_id=25
+	dhcp_option $option_id "$(pd)"
 }
 
 pd | dnsmasq