Limited fuzz by AFL committed, see [fuzz/README.md](fuzz/README.md) for details

fuzz/cli/README.md

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+# Clixon fuzzing
+
+This dir contains code for fuzzing clixon cli. 
+
+Note: cli plugins do not work.
+
+## Prereqs
+
+See [AFL docs](https://afl-1.readthedocs.io/en/latest) for installing afl.
+On ubuntu this may be enough:
+```
+  sudo apt install afl
+```
+
+You may have to change cpu frequency:
+```
+  cd /sys/devices/system/cpu
+  echo performance | tee cpu?/cpufreq/scaling_governor
+```
+
+And possibly change core behaviour:
+```
+  echo core >/proc/sys/kernel/core_pattern
+```
+
+## Build
+
+Build clixon statically with the afl-clang compiler:
+```
+  CC=/usr/bin/afl-clang-fast LINKAGE=static ./configure
+  make clean
+  cd apps/cli
+  make clixon_cli
+  sudo make install
+```
+
+## Run tests
+
+Start the backend and Use the script `runfuzz.sh` to run one test with a cli spec and an input string, eg:
+```
+  ./runfuzz.sh /usr/local/etc/hello.xml "set table parameter a value 23"
+```
+
+After (or during) the test, investigate results in the output dir.
+

fuzz/cli/input/1.cli

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+set hello world

fuzz/cli/input/2.cli

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+show configuration

fuzz/cli/input/3.cli

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+validate

fuzz/cli/runfuzz.sh

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+#!/usr/bin/env bash
+# Run a fuzzing test using american fuzzy lop
+set -eux
+
+if [ $# -ne 0 ]; then 
+    echo "usage: $0\n"
+    exit 255
+fi
+
+APPNAME=example
+cfg=conf.xml
+
+cat <<EOF > $cfg
+<clixon-config xmlns="http://clicon.org/config">
+  <CLICON_CONFIGFILE>$cfg</CLICON_CONFIGFILE>
+  <CLICON_FEATURE>*:*</CLICON_FEATURE>
+  <CLICON_YANG_DIR>/usr/local/share/clixon</CLICON_YANG_DIR>
+  <CLICON_YANG_MODULE_MAIN>clixon-hello</CLICON_YANG_MODULE_MAIN>
+  <CLICON_CLI_MODE>hello</CLICON_CLI_MODE>
+  <CLICON_SOCK>/usr/local/var/hello.sock</CLICON_SOCK>
+  <CLICON_CLISPEC_DIR>/usr/local/lib/hello/clispec</CLICON_CLISPEC_DIR>
+  <CLICON_BACKEND_PIDFILE>/usr/local/var/$APPNAME/$APPNAME.pidfile</CLICON_BACKEND_PIDFILE>
+  <CLICON_XMLDB_DIR>/usr/local/var/$APPNAME</CLICON_XMLDB_DIR>
+  <CLICON_STARTUP_MODE>init</CLICON_STARTUP_MODE>
+  <CLICON_MODULE_LIBRARY_RFC7895>false</CLICON_MODULE_LIBRARY_RFC7895>
+</clixon-config>
+EOF
+
+#cfg=/usr/local/etc/hello.xml # XXX
+# Kill previous
+sudo clixon_backend -z -f $cfg -s init 
+
+# Start backend
+sudo clixon_backend -f $cfg -s init
+
+MEGS=500 # memory limit for child process (50 MB)
+
+# remove input and input dirs
+#test ! -d input || rm -rf input
+test ! -d output || rm -rf output
+
+# create if dirs dont exists
+#test -d input || mkdir input
+test -d output || mkdir output
+
+# Run script 
+afl-fuzz -i input -o output -m $MEGS -- clixon_cli -f $cfg