Fuzzing of native http1 parser

test/fuzz/http1/README.md

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+# Clixon http1 fuzzing
+
+This dir contains code for fuzzing the clixon http1 parser. This is normally inside the
+native restconf app and need some special compiling to run stand-alone.
+
+Install AFL, see [..](..)
+
+Edit `apps/restconf/restconf_main_native.c` by disabling the regular
+main function and replacing it with the unit testing `main`:
+```
+--- a/apps/restconf/restconf_main_native.c
++++ b/apps/restconf/restconf_main_native.c
+@@ -1403,7 +1403,7 @@ usage(clicon_handle h,
+ /* Enable for normal use
+  * Disable for unit testing, fuzzing, etc
+  */
+-#if 1
++#if 0
+```
+
+Build and install clixon libraries and restconf statically
+```
+  ./configure LINKAGE=static INSTALLFLAGS="" CC=/usr/bin/afl-clang-fast
+  make
+  sudo make install
+  ./runfuzz.sh
+```
+

test/fuzz/http1/input/1.http

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+PUT /restconf/data/ietf-interfaces:interfaces/interface=eth%2f0%2f0 HTTP/1.1
+Host: 127.0.0.1
+Accept: */*
+Content-Type: application/yang-data+json
+Content-Length: 91
+
+{"ietf-interfaces:interface":{"name":"eth/0/0","type":"clixon-example:eth","enabled":true}}
+
+
+

test/fuzz/http1/input/2.http

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+GET /restconf/data HTTP/1.1
+Host: localhost
+Accept: application/yang-data+xml
+
+

test/fuzz/http1/input/3.http

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+POST /restconf/data/ietf-interfaces:interfaces HTTP/1.1
+Host: 127.0.0.1
+Accept: application/yang-data+xml
+Content-Type: application/yang-data+xml
+Content-Length: 138
+
+<interface xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"><name>eth/0/42</name><type>ex:eth</type><enabled>true</enabled></interface>
+

test/fuzz/http1/input/4.http

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+DELETE /restconf/data/ietf-interfaces:interfaces HTTP/1.1
+Host: 127.0.0.1
+
+

test/fuzz/http1/runfuzz.sh

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+#!/usr/bin/env bash
+# Run a fuzzing test using american fuzzy lop
+# Add input strings in input
+set -eux
+
+if [ $# -ne 0 ]; then 
+    echo "usage: $0"
+    exit 255
+fi
+
+MEGS=500 # memory limit for child process (50 MB)
+
+# remove input and input dirs
+#test ! -d input || rm -rf input
+test ! -d output || sudo rm -rf output
+
+# create if dirs dont exists
+#test -d input || mkdir input
+test -d output || mkdir output
+
+# Run script 
+#  CC=/usr/bin/afl-clang 
+sudo afl-fuzz -i input -o output -d -m $MEGS -- /usr/local/sbin/clixon_restconf
+
+