sleep readme

[mirrors/Programs.git] / bash / dhcp-option.sh

diff --git a/bash/dhcp-option.sh b/bash/dhcp-option.sh
index c9c5a76ee2d1bf4f8b11565d8d548e270dc42ae7..e5f825dda637900a6dcff57b076f4921b6e10a07 100755 (executable)
--- 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