mirror of https://github.com/google/oss-fuzz.git
110 lines
2.6 KiB
Go
110 lines
2.6 KiB
Go
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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package h2c
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import (
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"bufio"
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"bytes"
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"context"
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"fmt"
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"golang.org/x/net/http2"
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"io/ioutil"
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"net"
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"net/http"
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"net/textproto"
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"net/url"
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"runtime"
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"strings"
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)
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type FakeHttpWriter struct {
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HeaderStatus int
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Payload []byte
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}
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func (f *FakeHttpWriter) Header() http.Header {
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return http.Header{}
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}
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func (f *FakeHttpWriter) Write(body []byte) (int, error) {
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f.Payload = body
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return len(body), nil
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}
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func (f *FakeHttpWriter) WriteHeader(status int) {
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f.HeaderStatus = status
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}
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func (f *FakeHttpWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
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r1 := bytes.NewReader([]byte{})
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r2 := bufio.NewReader(r1)
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w := bufio.NewWriter(ioutil.Discard)
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rw := bufio.NewReadWriter(r2, w)
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return nil, rw, nil
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}
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// We ignore these panics, as they don't represent real bugs.
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func catchPanics() {
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if r := recover(); r != nil {
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var err string
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switch r.(type) {
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case string:
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err = r.(string)
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case runtime.Error:
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err = r.(runtime.Error).Error()
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case error:
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err = r.(error).Error()
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}
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// Very hacky for now, but it rids us of a lot of instantiation
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if strings.Contains(err, "invalid memory address or nil pointer dereference") {
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return
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} else {
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panic(err)
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}
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}
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}
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func FuzzH2c(data []byte) int {
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if len(data) < 10 {
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return 0
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}
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headerMap := make(map[string][]string)
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headerMap[textproto.CanonicalMIMEHeaderKey("Upgrade")] = []string{"h2c"}
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headerMap[textproto.CanonicalMIMEHeaderKey("Connection")] = []string{"HTTP2-Settings"}
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headerMap[textproto.CanonicalMIMEHeaderKey("HTTP2-Settings")] = []string{""}
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handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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fmt.Fprint(w, "Hello world")
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})
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h2s := &http2.Server{
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// ...
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}
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h := NewHandler(handler, h2s)
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w := &FakeHttpWriter{}
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r, err := http.NewRequestWithContext(context.Background(), "PUT", "nil", bytes.NewReader(data))
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if err != nil {
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return -1
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}
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r.Header = headerMap
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u, err := url.Parse("http://localhost:8001")
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if err != nil {
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return 0
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}
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r.URL = u
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defer catchPanics()
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h.ServeHTTP(w, r)
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return 1
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}
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