From b7b046ce83c695275a71d90fab530d724e77a7ff Mon Sep 17 00:00:00 2001
From: Matt Morehouse <mattmorehouse@gmail.com>
Date: Mon, 21 Aug 2023 15:35:13 -0500
Subject: [PATCH] fuzz: target for channel_reestablish

Fuzz the decoding and encoding of channel_reestablish.
---
 tests/fuzz/fuzz-wire-channel_reestablish.c | 73 ++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 tests/fuzz/fuzz-wire-channel_reestablish.c

diff --git a/tests/fuzz/fuzz-wire-channel_reestablish.c b/tests/fuzz/fuzz-wire-channel_reestablish.c
new file mode 100644
index 000000000..771ea9876
--- /dev/null
+++ b/tests/fuzz/fuzz-wire-channel_reestablish.c
@@ -0,0 +1,73 @@
+#include "config.h"
+#include <assert.h>
+#include <ccan/mem/mem.h>
+#include <stdint.h>
+#include <tests/fuzz/libfuzz.h>
+#include <tests/fuzz/wire.h>
+#include <wire/peer_wire.h>
+
+struct channel_reestablish {
+	struct channel_id channel_id;
+	u64 next_commitment_number;
+	u64 next_revocation_number;
+	struct secret your_last_per_commitment_secret;
+	struct pubkey my_current_per_commitment_point;
+	struct tlv_channel_reestablish_tlvs *tlvs;
+};
+
+static void *encode(const tal_t *ctx, const struct channel_reestablish *s)
+{
+	return towire_channel_reestablish(
+	    ctx, &s->channel_id, s->next_commitment_number,
+	    s->next_revocation_number, &s->your_last_per_commitment_secret,
+	    &s->my_current_per_commitment_point, s->tlvs);
+}
+
+static struct channel_reestablish *decode(const tal_t *ctx, const void *p)
+{
+	struct channel_reestablish *s = tal(ctx, struct channel_reestablish);
+
+	if (fromwire_channel_reestablish(
+		s, p, &s->channel_id, &s->next_commitment_number,
+		&s->next_revocation_number, &s->your_last_per_commitment_secret,
+		&s->my_current_per_commitment_point, &s->tlvs))
+		return s;
+	return tal_free(s);
+}
+
+static bool equal(const struct channel_reestablish *x,
+		  const struct channel_reestablish *y)
+{
+	size_t upto_tlvs = (uintptr_t)&x->tlvs - (uintptr_t)x;
+	if (memcmp(x, y, upto_tlvs) != 0)
+		return false;
+
+	assert(x->tlvs && y->tlvs);
+
+	if (!memeq(x->tlvs->next_funding, tal_bytelen(x->tlvs->next_funding),
+		   y->tlvs->next_funding, tal_bytelen(y->tlvs->next_funding)))
+		return false;
+	if (!memeq(x->tlvs->next_to_send, tal_bytelen(x->tlvs->next_to_send),
+		   y->tlvs->next_to_send, tal_bytelen(y->tlvs->next_to_send)))
+		return false;
+	if (!memeq(x->tlvs->desired_channel_type,
+		   tal_bytelen(x->tlvs->desired_channel_type),
+		   y->tlvs->desired_channel_type,
+		   tal_bytelen(y->tlvs->desired_channel_type)))
+		return false;
+	if (!memeq(x->tlvs->current_channel_type,
+		   tal_bytelen(x->tlvs->current_channel_type),
+		   y->tlvs->current_channel_type,
+		   tal_bytelen(y->tlvs->current_channel_type)))
+		return false;
+	return memeq(x->tlvs->upgradable_channel_type,
+		     tal_bytelen(x->tlvs->upgradable_channel_type),
+		     y->tlvs->upgradable_channel_type,
+		     tal_bytelen(y->tlvs->upgradable_channel_type));
+}
+
+void run(const u8 *data, size_t size)
+{
+	test_decode_encode(data, size, WIRE_CHANNEL_REESTABLISH,
+			   struct channel_reestablish);
+}