Quelle 2014868.html

Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/dom/media/webrtc/tests/crashtests/2014868.html

<!DOCTYPE html>
<html class="reftest-wait">
<head>
  <meta charset="utf-8">
  <title>Bug 2014868 - Reject SDP when MID changes at existing m-line index</title>
</head>
<body>
<script>
async function run() {
  try {
    const pc1 = new RTCPeerConnection();
    const pc2 = new RTCPeerConnection();

    pc1.addTransceiver("audio", { direction: "sendrecv" });
    pc1.addTransceiver("video", { direction: "recvonly" });
    pc1.createDataChannel("test");

    let offer = await pc1.createOffer();
    await pc1.setLocalDescription(offer);
    await pc2.setRemoteDescription(offer);
    let answer = await pc2.createAnswer();
    await pc2.setLocalDescription(answer);
    await pc1.setRemoteDescription(answer);

    // Stop video transceiver to trigger recycling logic
    for (const t of pc1.getTransceivers()) {
      if (t.receiver.track.kind === "video") {
        t.stop();
      }
    }

    offer = await pc1.createOffer();
    await pc1.setLocalDescription(offer);
    await pc2.setRemoteDescription(offer);
    answer = await pc2.createAnswer();
    await pc2.setLocalDescription(answer);
    await pc1.setRemoteDescription(answer);

    // Munge the offer: insert a duplicate video m-line at the application m-line
    // position. This displaces the application section and creates a media type
    // mismatch at that index, testing that we reject invalid type changes.
    const sdpLines = offer.sdp.split("\r\n");
    let mLineCount = 0;
    let insertIndex = -1;
    for (let i = 0; i < sdpLines.length; i++) {
      if (sdpLines[i].startsWith("m=")) {
        mLineCount++;
        if (mLineCount === 2) {
          insertIndex = i;
        }
      }
    }

    // Duplicate the second m-line section with a changed MID
    if (insertIndex !== -1) {
      let endIndex = insertIndex + 1;
      for (let i = insertIndex + 1; i < sdpLines.length; i++) {
        if (sdpLines[i].startsWith("m=")) {
          endIndex = i;
          break;
        }
      }
      if (endIndex === sdpLines.length) endIndex = sdpLines.length;

      const mlineSection = sdpLines.slice(insertIndex, endIndex);
      // Change the MID in the copied section
      for (let i = 0; i < mlineSection.length; i++) {
        if (mlineSection[i].startsWith("a=mid:")) {
          mlineSection[i] = "a=mid:changed-mid";
          break;
        }
      }
      sdpLines.splice(endIndex, 0, ...mlineSection);
    }

    const modifiedAnswer = { type: "offer", sdp: sdpLines.join("\r\n") };
    await pc1.setRemoteDescription(modifiedAnswer);

    pc1.close();
    pc2.close();
  } catch (e) {
  }

  document.documentElement.removeAttribute("class");
}

run();
</script>
</body>
</html>

Messung V0.5 in Prozent

¤ Dauer der Verarbeitung: 0.15 Sekunden (vorverarbeitet am 2026-08-25) ¤

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