From 7e8b18e48089f6dd32692230495f7146779bf60d Mon Sep 17 00:00:00 2001
From: zebambam <bambam@electriccoin.co>
Date: Tue, 15 Oct 2019 00:00:21 +0000
Subject: [PATCH] Added basic fuzzing to the monolith, see ticket #4155

---
 src/bitcoind.cpp |  6 +++++-
 src/fuzz.cpp     | 18 ++++++++++++++++++
 src/fuzz.h       |  2 ++
 3 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 src/fuzz.cpp
 create mode 100644 src/fuzz.h

diff --git a/src/bitcoind.cpp b/src/bitcoind.cpp
index 7790a6ce9..391772652 100644
--- a/src/bitcoind.cpp
+++ b/src/bitcoind.cpp
@@ -186,7 +186,10 @@ bool AppInit(int argc, char* argv[])
 
     return fRet;
 }
-
+#include "fuzz.h"
+#ifdef ZCASH_FUZZ
+#include "fuzz.cpp"
+#else
 int main(int argc, char* argv[])
 {
     SetupEnvironment();
@@ -196,3 +199,4 @@ int main(int argc, char* argv[])
 
     return (AppInit(argc, argv) ? EXIT_SUCCESS : EXIT_FAILURE);
 }
+#endif
diff --git a/src/fuzz.cpp b/src/fuzz.cpp
new file mode 100644
index 000000000..4c68bfab3
--- /dev/null
+++ b/src/fuzz.cpp
@@ -0,0 +1,18 @@
+extern bool DecodeHexTx(CTransaction& tx, const std::string& strHexTx);
+
+bool fuzz_DecodeHexTxFunction (const std::string& strHexTx) {
+        CTransaction tx;
+        return DecodeHexTx(tx, strHexTx);
+}
+
+
+int fuzz_DecodeHexTx (int argc, char *argv[]) {
+        std::ifstream t(argv[1]);
+        std::string str((std::istreambuf_iterator<char>(t)),
+                                         std::istreambuf_iterator<char>());
+        if (fuzz_DecodeHexTxFunction (str)) { fprintf(stdout, "Decoded hex string") ; return 0; }
+        else { fprintf(stderr, "Could not decode hex string") ; return -1; }
+}
+
+int main (int argc, char *argv[]) { return ZCASH_FUZZER_MAIN(argc, argv); }
+#warning BUILDING A FUZZER, NOT THE REAL MAIN
diff --git a/src/fuzz.h b/src/fuzz.h
new file mode 100644
index 000000000..1199e5891
--- /dev/null
+++ b/src/fuzz.h
@@ -0,0 +1,2 @@
+//#define ZCASH_FUZZ
+#define ZCASH_FUZZER_MAIN fuzz_DecodeHexTx