require strict match random data fetch size

Snawoot · Snawoot · commit afcda1cf1b77 · 2025-09-03T13:48:34.000+03:00
diff --git a/dialer/h2.go b/dialer/h2.go
@@ -99,9 +99,13 @@ func H2ProxyDialerFromURL(u *url.URL, next xproxy.Dialer) (xproxy.Dialer, error)
 				return nil, fmt.Errorf("garbage fetch request failed: %w", err)
 			}
 			defer resp.Body.Close()
-			if _, err = io.Copy(io.Discard, io.LimitReader(resp.Body, int64(garbageLen))); err != nil {
+			n, err := io.Copy(io.Discard, io.LimitReader(resp.Body, int64(garbageLen)))
+			if err != nil {
 				return nil, fmt.Errorf("garbage body fetch failed: %w", err)
 			}
+			if n < int64(garbageLen) {
+				return nil, errors.New("incomplete garbage read")
+			}
 			return c, nil
 		},
 	}

Original file line number	Diff line number	Diff line change
`@@ -99,9 +99,13 @@ func H2ProxyDialerFromURL(u *url.URL, next xproxy.Dialer) (xproxy.Dialer, error)`
`99`	`99`	`return nil, fmt.Errorf("garbage fetch request failed: %w", err)`
`100`	`100`	`}`
`101`	`101`	`defer resp.Body.Close()`
`102`		`- if _, err = io.Copy(io.Discard, io.LimitReader(resp.Body, int64(garbageLen))); err != nil {`
	`102`	`+ n, err := io.Copy(io.Discard, io.LimitReader(resp.Body, int64(garbageLen)))`
	`103`	`+ if err != nil {`
`103`	`104`	`return nil, fmt.Errorf("garbage body fetch failed: %w", err)`
`104`	`105`	`}`
	`106`	`+ if n < int64(garbageLen) {`
	`107`	`+ return nil, errors.New("incomplete garbage read")`
	`108`	`+ }`
`105`	`109`	`return c, nil`
`106`	`110`	`},`
`107`	`111`	`}`