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# Fuzzing ISC BIND (verified with 9.15.4) #
**Requirements**
* honggfuzz (1.9 or from the master branch)
* clang-5.0 or newer (the newer, the better)
* ISC Bind (tested with 9.15.4)
**Preparation**
1. Compile honggfuzz
2. Download bind-9.15.4.tgz from https://downloads.isc.org/isc/bind9/
3. Decompress/unpack and patch it
```shell
$ cd <fuzzing_dir>
$ tar -xvzf bind-9.15.4.tar.gz
$ cd bind-9.15.4
$ patch -p1 < <honggfuzz_dir>/examples/bind/bind-9.15.4.patch
$ chmod 755 compile.sh
```
4. Configure, compile and install ISC Bind
* edit _compile.sh_, so it contains the correct dist (_--prefix_) path
```shell
$ vim compile.sh # [edit the --prefix]
$ ./compile.sh
$ make install
```
5. Copy the custom configuration files to ```<fuzzing_directory>/bind/dist/etc/named.conf``` (i.e. to your bind/named dist directory)
```shell
$ cp honggfuzz/examples/bind/named.conf <fuzzing_directory>/bind/dist/etc/
$ cp honggfuzz/examples/bind/test.zone <fuzzing_directory>/bind/dist/etc/
```
6. Fix the _directory_ configuration directive inside your <fuzzing_directory>/bind/dist/etc/named.conf
```shell
$ vim <fuzzing_directory>/bind/dist/etc/named.conf # [edit the *directory* directive]
```
7. **Fuzz it!**
```shell
$ <honggfuzz_dir>/honggfuzz -i input_corpus -- ./dist/sbin/named -c <fuzzing_directory>/bind/dist/etc/named.conf -g
```
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