add a fuzzer

fuzz.sh

@@ -0,0 +1,51 @@
+#! /bin/sh
+
+start () {
+    printf "%-20s [" "$@"
+}
+
+fin () {
+    echo ']'
+}
+
+failures=0
+fail () {
+    echo -n '!'
+    failures=$(expr $failures + 1)
+}
+
+start "Full fuzz"
+for i in $(seq 200); do
+    ./eris < /dev/urandom 2>/dev/null | grep -q '^HTTP/1.0 40' || fail
+    [ $(expr $i % 5) = 0 ] && echo -n '.'
+done
+fin
+
+start "Path"
+for i in $(seq 200); do
+    (
+        printf "GET /"
+        dd if=/dev/urandom count=2 2>/dev/null | tr -d '\0\r\n ?'
+        printf " HTTP/1.0\r\n\r\n"
+    ) | ./eris 2>/dev/null | grep -q '^HTTP/1.0 404' || fail
+    [ $(expr $i % 5) = 0 ] && echo -n '.'
+done
+fin
+
+start "Header"
+for i in $(seq 200); do
+    (
+        printf "GET / HTTP/1.0\r\n"
+        dd if=/dev/urandom count=2 2>/dev/null | tr -d '\0'
+        printf "\r\n\r\n"
+    ) | ./eris 2>/dev/null | grep -q '^HTTP/1.0 200' || fail
+    [ $(expr $i % 5) = 0 ] && echo -n '.'
+done
+fin
+
+if [ $failures -eq 0 ]; then
+    echo "All tests passed!"
+else
+    echo "FAIL: $failures failures"
+    exit $failures
+fi