Simplified control over DNS routing in JAVA
When you need more control on which DNS servers to use in Java for certain hosts or domains.
Create a DNS Control configuration file as such:
# Selection order is more specific wins # For example, if you have a host, domain, and default override, they will be processed in that order. # The left hand side is the destination to override, the right hand is the list of dns servers to use. # Left hand entries should be unique, one entry per destination. # Don't need to suffix your entries with "." dot, this is implied, meaning, default domain will not be appended. # Setup default DNS servers, this is optional. # If not defined, the current host DNS servers will be used if unset (i.e. resolv.conf). .=10.0.0.1,10.0.0.2 # Override DNS lookups for specific hosts www.openpojo.com=10.1.1.1 # Override DNS lookups for whole domains (starts with "." dot), # This will override lookups for *.openpojo.com (i.e. some.host.openpojo.com) .openpojo.com=10.0.2.2 # Suppress any queries that you'd like to never resolve hiddenhost.openpojo.com= # Finally if you want to use your current system's DNS servers without having to know the entries. unchanged.resolution.openpojo.com=SYSTEM
startup your JVM passing NameService provider as well as DNS routing file
java -Dsun.net.spi.nameservice.provider.1=dns,dnscontrol \ -Ddnscontrol.conf.file=/path/where/dns_control_file
If you have a hosts file you'd like to also use you may use the jdk.net.hosts.file property and add it to your startup parameters
java -Dsun.net.spi.nameservice.provider.1=dns,dnscontrol \ -Ddnscontrol.conf.file=/path/where/dns_control_file \ -Djdk.net.hosts.file=/path/where/hosts_file
- The default value for dnscontrol.conf.file is /dnscontrol.conf on root of the classpath.
- The Hosts file is the highest priority when it comes to resolution.
Currently DNSControl runs on Java 1.7 & 1.8.
Builds on the functionality provided by dnsjava.