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Merge pull request #371 from projectdiscovery/feature-race-conditions
Synced Race Condition Attack
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| package syncedreadcloser | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "io/ioutil" | ||
| "time" | ||
| ) | ||
|
|
||
| // compatible with ReadSeeker | ||
| type SyncedReadCloser struct { | ||
| data []byte | ||
| p int64 | ||
| length int64 | ||
| opengate chan struct{} | ||
| enableBlocking bool | ||
| } | ||
|
|
||
| func New(r io.ReadCloser) *SyncedReadCloser { | ||
| var ( | ||
| s SyncedReadCloser | ||
| err error | ||
| ) | ||
| s.data, err = ioutil.ReadAll(r) | ||
| if err != nil { | ||
| return nil | ||
| } | ||
| r.Close() | ||
| s.length = int64(len(s.data)) | ||
| s.opengate = make(chan struct{}) | ||
| s.enableBlocking = true | ||
|
|
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| return &s | ||
| } | ||
|
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| func NewOpenGateWithTimeout(r io.ReadCloser, d time.Duration) *SyncedReadCloser { | ||
| s := New(r) | ||
| s.OpenGateAfter(d) | ||
|
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| return s | ||
| } | ||
|
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| func (s *SyncedReadCloser) SetOpenGate(status bool) { | ||
| s.enableBlocking = status | ||
| } | ||
|
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| func (s *SyncedReadCloser) OpenGate() { | ||
| s.opengate <- struct{}{} | ||
| } | ||
|
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| func (s *SyncedReadCloser) OpenGateAfter(d time.Duration) { | ||
| time.AfterFunc(d, func() { | ||
| s.opengate <- struct{}{} | ||
| }) | ||
| } | ||
|
|
||
| func (s *SyncedReadCloser) Seek(offset int64, whence int) (int64, error) { | ||
| var err error | ||
| switch whence { | ||
| case io.SeekStart: | ||
| s.p = 0 | ||
| case io.SeekCurrent: | ||
| if s.p+offset < s.length { | ||
| s.p += offset | ||
| break | ||
| } | ||
| err = fmt.Errorf("offset is too big") | ||
| case io.SeekEnd: | ||
| if s.length-offset >= 0 { | ||
| s.p = s.length - offset | ||
| break | ||
| } | ||
| err = fmt.Errorf("offset is too big") | ||
| } | ||
| return s.p, err | ||
| } | ||
|
|
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| func (s *SyncedReadCloser) Read(p []byte) (n int, err error) { | ||
| // If the data fits in the buffer blocks awaiting the sync instruction | ||
| if s.p+int64(len(p)) >= s.length && s.enableBlocking { | ||
| <-s.opengate | ||
| } | ||
| n = copy(p, s.data[s.p:]) | ||
| s.p += int64(n) | ||
| if s.p == s.length { | ||
| err = io.EOF | ||
| } | ||
| return n, err | ||
| } | ||
|
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||
| func (s *SyncedReadCloser) Close() error { | ||
| return nil | ||
| } | ||
|
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| func (s *SyncedReadCloser) Len() int { | ||
| return int(s.length) | ||
| } |