Merge #18363: tests: Add fuzzing harness for HTTPRequest, libevent's evhttp and related functions

cdfb8e7afa7648405dd6b957f47b1c7ab566a076 tests: Add fuzzing harness for HTTPRequest, libevent's evhttp and related functions (practicalswift)

Pull request description:

  Add fuzzing harness for `HTTPRequest`, `libevent`'s `evhttp` and related functions.

ACKs for top commit:
  laanwj:
    ACK cdfb8e7afa7648405dd6b957f47b1c7ab566a076

Tree-SHA512: da481afed5eb3232d3f3d0583094e56050e6234223dfcb356d8567fe0616336eb1b78c5e6821325fc9767e385e5dfaf3c96f0d35ffdb67f18d74f9a9a9464e24

1 files changed, 56 insertions, 0 deletions

diff --git a/src/test/fuzz/http_request.cpp b/src/test/fuzz/http_request.cpp
new file mode 100644
index 0000000000..4104c5574d
--- /dev/null
+++ b/src/test/fuzz/http_request.cpp
@@ -0,0 +1,56 @@
+// Copyright (c) 2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <httpserver.h>
+#include <netaddress.h>
+#include <test/fuzz/FuzzedDataProvider.h>
+#include <test/fuzz/fuzz.h>
+#include <test/fuzz/util.h>
+
+#include <event2/buffer.h>
+#include <event2/http.h>
+#include <event2/http_struct.h>
+
+#include <cassert>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+extern "C" int evhttp_parse_firstline_(struct evhttp_request*, struct evbuffer*);
+extern "C" int evhttp_parse_headers_(struct evhttp_request*, struct evbuffer*);
+std::string RequestMethodString(HTTPRequest::RequestMethod m);
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
+    evhttp_request* evreq = evhttp_request_new(nullptr, nullptr);
+    assert(evreq != nullptr);
+    evreq->kind = EVHTTP_REQUEST;
+    evbuffer* evbuf = evbuffer_new();
+    assert(evbuf != nullptr);
+    const std::vector<uint8_t> http_buffer = ConsumeRandomLengthByteVector(fuzzed_data_provider, 4096);
+    evbuffer_add(evbuf, http_buffer.data(), http_buffer.size());
+    if (evhttp_parse_firstline_(evreq, evbuf) != 1 || evhttp_parse_headers_(evreq, evbuf) != 1) {
+        evbuffer_free(evbuf);
+        evhttp_request_free(evreq);
+        return;
+    }
+
+    HTTPRequest http_request{evreq, true};
+    const HTTPRequest::RequestMethod request_method = http_request.GetRequestMethod();
+    (void)RequestMethodString(request_method);
+    (void)http_request.GetURI();
+    (void)http_request.GetHeader("Host");
+    const std::string header = fuzzed_data_provider.ConsumeRandomLengthString(16);
+    (void)http_request.GetHeader(header);
+    (void)http_request.WriteHeader(header, fuzzed_data_provider.ConsumeRandomLengthString(16));
+    (void)http_request.GetHeader(header);
+    const std::string body = http_request.ReadBody();
+    assert(body.empty());
+    const CService service = http_request.GetPeer();
+    assert(service.ToString() == "[::]:0");
+
+    evbuffer_free(evbuf);
+    evhttp_request_free(evreq);
+}