fuzz: bring oss-fuzz initial code converted to C89

tests/fuzz/CMakeLists.txt

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+# FIXME, probably adapt from file in ../unit

tests/fuzz/Makefile.am

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+#***************************************************************************
+#                                  _   _ ____  _
+#  Project                     ___| | | |  _ \| |
+#                             / __| | | | |_) | |
+#                            | (__| |_| |  _ <| |___
+#                             \___|\___/|_| \_\_____|
+#
+# Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at https://curl.haxx.se/docs/copyright.html.
+#
+# You may opt to use, copy, modify, merge, publish, distribute and/or sell
+# copies of the Software, and permit persons to whom the Software is
+# furnished to do so, under the terms of the COPYING file.
+#
+# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+# KIND, either express or implied.
+#
+###########################################################################
+
+
+# FIXME, probably adapt from file in ../unit

tests/fuzz/Makefile.inc

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+FUZZER_HTTP11 = curl_fuzzer.c
+FUZZER_HTTP11_CPPFLAGS = $(AM_CPPFLAGS)
+
+
+FUZZER_FTP = curl_fuzzer.c
+FUZZER_FTP_CPPFLAGS = -DFUZZER_FTP $(AM_CPPFLAGS)
+
+FUZZER_IMAP = curl_fuzzer.c
+FUZZER_IMAP_CPPFLAGS = -DFUZZER_IMAP $(AM_CPPFLAGS)
+
+FUZZER_POP3 = curl_fuzzer.c
+FUZZER_POP3_CPPFLAGS = -DFUZZER_POP3 $(AM_CPPFLAGS)
+
+FUZZER_HTTP_UPLOAD = curl_fuzzer.c
+FUZZER_HTTP_UPLOAD_CPPFLAGS = -DFUZZER_HTTP_UPLOAD $(AM_CPPFLAGS)
+
+
+FUZZER_HTTP2 = curl_fuzzer.c
+FUZZER_HTTP2_CPPFLAGS = -DFUZZER_HTTP2 $(AM_CPPFLAGS)

tests/fuzz/README

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+Fuzz tests
+==========
+
+The goal is to add tests for *ALL* protocols supported in libcurl.
+We will need some additional patches in the future, to increase coverage.
+
+Building the fuzz target
+========================
+
+FIXME fill out once the makefiles are in order.

tests/fuzz/curl_fuzzer.c

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+/*
+# Copyright 2016 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+*/
+
+#include <errno.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/select.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <curl/curl.h>
+
+static const void *cur_data;
+static int cur_size = -1;
+static int server_fd = -1;
+static int client_fd = -1;
+static int wrote = 0;
+
+static void fail(const char *why) {
+  perror(why);
+  exit(1);
+}
+
+static curl_socket_t open_sock(void *ctx, curlsocktype purpose,
+                               struct curl_sockaddr *address) {
+  if(cur_size == -1) {
+    fail("not fuzzing");
+  }
+  if(server_fd != -1 || client_fd != -1) {
+    fail("already connected");
+  }
+  int fds[2];
+  if(socketpair(AF_UNIX, SOCK_STREAM, 0, fds)) {
+    fail("socketpair");
+  }
+  server_fd = fds[0];
+  client_fd = fds[1];
+  if(write(server_fd, cur_data, cur_size) != cur_size) {
+    fail("write");
+  }
+  if(shutdown(server_fd, SHUT_WR)) {
+    fail("shutdown");
+  }
+  return client_fd;
+}
+
+static int set_opt(void *ctx, curl_socket_t curlfd, curlsocktype purpose) {
+  return CURL_SOCKOPT_ALREADY_CONNECTED;
+}
+
+static size_t write_callback(char *ptr, size_t size, size_t n, void *ctx) {
+  return size * n;
+}
+
+static size_t read_callback(char *buf, size_t size, size_t n, void *ctx) {
+  if(wrote || size * n == 0) {
+    return 0;
+  }
+  wrote = 1;
+  buf[0] = 'a';
+  return 1;
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  cur_data = Data;
+  cur_size = Size;
+  wrote = 0;
+  CURL *curl = curl_easy_init();
+  curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
+  curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
+  curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, open_sock);
+  curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, set_opt);
+#if defined(FUZZER_FTP)
+  curl_easy_setopt(curl, CURLOPT_URL, "ftp://user@localhost/file.txt");
+#elif defined(FUZZER_IMAP)
+  curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
+  curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
+  curl_easy_setopt(curl, CURLOPT_URL, "imap://localhost");
+#elif defined(FUZZER_POP3)
+  curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
+  curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
+  curl_easy_setopt(curl, CURLOPT_URL, "pop3://localhost");
+#elif defined(FUZZER_HTTP_UPLOAD)
+  curl_easy_setopt(curl, CURLOPT_URL, "http://localhost/");
+  curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
+  curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
+#elif defined(FUZZER_HTTP2)
+  curl_easy_setopt(curl, CURLOPT_URL, "http://localhost/");
+  /* use non-TLS HTTP/2 without HTTP/1.1 Upgrade: */
+  curl_easy_setopt(curl, CURLOPT_HTTP_VERSION,
+                   CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE);
+#else
+  curl_easy_setopt(curl, CURLOPT_URL, "http://localhost/");
+  curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
+#endif
+  curl_easy_perform(curl);
+  curl_easy_cleanup(curl);
+  close(server_fd);
+  close(client_fd);
+  server_fd = -1;
+  client_fd = -1;
+  cur_data = NULL;
+  cur_size = -1;
+  return 0;
+}