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Read network interfaces from system and remove invalid characters from hostnames #17

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Mar 6, 2017
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Read network interfaces from system and remove invalid characters from hostnames #17

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56 changes: 32 additions & 24 deletions diskstation_dns_modify.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,11 @@ ZoneRootDir=/var/packages/DNSServer/target
ZonePath=$ZoneRootDir/named/etc/zone/master
DHCPAssigned=/etc/dhcpd/dhcpd.conf

NetworkInterfaces=",`ip -o link show | awk -F': ' '{printf $2","}'`"

date_echo "Network interfaces:"
date_echo $NetworkInterfaces

# An address may not have been assigned yet so verify
# the leases log file exists before assigning.
DHCPLeases=/etc/dhcpd/dhcpd-leases.log
Expand Down Expand Up @@ -105,30 +110,33 @@ printDhcpAsRecords () {
# Process the DHCP static and dynamic records
# Logic is the same for PTR and A records. Just a different print output.
# Sorts and remove duplicates. Filters records you don't want.
awk -v YourNetworkName=$YourNetworkName -v RecordType=$1 -v StaticRecords=$2 '
BEGIN {
# Set awks field separator and network adapter names.
FS="[\t =,]";
adapters=",eth0,eth1,eth2,eth3,eth4,eth5,eth6,eth7,bond0,bond1,bond2,bond3,,*,";
}
{IP=""} # clear out variables
$1 ~ /^[0-9]/ {IP=$3; NAME=$4; RENEW=86400} # Leases start with numbers
$1 == "dhcp-host" {IP=$4; NAME=$3; RENEW=$5} # Static assignments start with dhcp-host
index(adapters, "," NAME "," ) > 0 {IP="";} # Dont print if machine name is a network adapter
(IP != "") {
split(IP,arr,".");
ReverseIP = arr[4] "." arr[3] "." arr[2] "." arr[1];
if(RecordType == "PTR" && index(StaticRecords, ReverseIP ".in-addr.arpa.," ) > 0) {IP="";}
if(RecordType == "A" && index(StaticRecords, NAME "." YourNetworkName ".," ) > 0) {IP="";}
# Print the last number in the IP address so we can sort the addresses
# Add a tab character so that "cut" sees two fields... it will print the second
# field and remove the first which is the last number in the IP address.
if(IP != "") {
if (RecordType == "PTR") {print 1000 + arr[4] "\t" ReverseIP ".in-addr.arpa.\t" RENEW "\tPTR\t" NAME "." YourNetworkName ".\t;dynamic"}
if (RecordType == "A") print 2000 + arr[4] "\t" NAME "." YourNetworkName ".\t" RENEW "\tA\t" IP "\t;dynamic"
}
}
' $DHCPAssigned| sort | cut -f 2- | uniq
awk -v YourNetworkName=$YourNetworkName -v RecordType=$1 -v StaticRecords=$2 -v adapters=$NetworkInterfaces '
BEGIN {
# Set awks field separator
FS="[\t =,]";
}
{IP=""} # clear out variables
# Leases start with numbers. Do not use if column 4 is an interface
$1 ~ /^[0-9]/ { if(NF>4 || index(adapters, "," $4 "," ) == 0) { IP=$3; NAME=$4; RENEW=86400 } }
# Static assignments start with dhcp-host
$1 == "dhcp-host" {IP=$4; NAME=$3; RENEW=$5}
# If we have an IP and a NAME (and if name is not a placeholder)
(IP != "" && NAME!="*" && NAME!="") {
split(IP,arr,".");
ReverseIP = arr[4] "." arr[3] "." arr[2] "." arr[1];
if(RecordType == "PTR" && index(StaticRecords, ReverseIP ".in-addr.arpa.," ) > 0) {IP="";}
if(RecordType == "A" && index(StaticRecords, NAME "." YourNetworkName ".," ) > 0) {IP="";}
# Remove invalid characters according to rfc952
gsub(/([^a-zA-Z0-9-]*|^[-]*|[-]*$)/,"",NAME)
# Print the last number in the IP address so we can sort the addresses
# Add a tab character so that "cut" sees two fields... it will print the second
# field and remove the first which is the last number in the IP address.
if(IP != "" && NAME!="*" && NAME!="") {
if (RecordType == "PTR") {print 1000 + arr[4] "\t" ReverseIP ".in-addr.arpa.\t" RENEW "\tPTR\t" NAME "." YourNetworkName ".\t;dynamic"}
if (RecordType == "A") print 2000 + arr[4] "\t" NAME "." YourNetworkName ".\t" RENEW "\tA\t" IP "\t;dynamic"
}
}
' $DHCPAssigned| sort | cut -f 2- | uniq


}
Expand Down