add script to generate msg test target

fuzz/fuzz_targets/msg_targets/gen_target.sh

@@ -0,0 +1,5 @@
+for target in CommitmentSigned FundingCreated FundingLocked FundingSigned OpenChannel RevokeAndACK Shutdown UpdateAddHTLC UpdateFailHTLC UpdateFailMalformedHTLC UpdateFee UpdateFulfillHTLC AcceptChannel ClosingSigned; do 
+	tn=$(echo $target | sed 's/\([a-z0-9]\)\([A-Z]\)/\1_\L\2/g')
+	fn=msg_$(echo $tn | tr '[:upper:]' '[:lower:]')_target.rs
+	cat msg_target_template.txt | sed s/MSG_TARGET/$target/ > $fn
+done

fuzz/fuzz_targets/msg_targets/msg_target_template.txt

@@ -0,0 +1,49 @@
+extern crate lightning;
+
+use lightning::ln::msgs;
+use lightning::util::reset_rng_state;
+
+use lightning::ln::msgs::{MsgEncodable, MsgDecodable};
+
+mod utils;
+use utils::slice_to_be16;
+
+#[inline]
+pub fn do_test(data: &[u8]) {
+	reset_rng_state();
+	let mut read_pos = 0;
+	loop {
+		test_msg!(msgs::MSG_TARGET, data, read_pos);
+	}
+}
+
+#[cfg(feature = "afl")]
+extern crate afl;
+#[cfg(feature = "afl")]
+fn main() {
+	afl::read_stdio_bytes(|data| {
+		do_test(&data);
+	});
+}
+
+#[cfg(feature = "honggfuzz")]
+#[macro_use] extern crate honggfuzz;
+#[cfg(feature = "honggfuzz")]
+fn main() {
+	loop {
+		fuzz!(|data| {
+			do_test(data);
+		});
+	}
+}
+
+#[cfg(test)]
+mod tests {
+	use utils::extend_vec_from_hex;
+	#[test]
+	fn duplicate_crash() {
+		let mut a = Vec::new();
+		extend_vec_from_hex("00", &mut a);
+		super::do_test(&a);
+	}
+}