verifyTcpCapture() — netty Function Reference

Architecture documentation for the verifyTcpCapture() function in PcapWriteHandlerTest.java from the netty codebase.

Function java Buffer Allocators called by 6

Entity Profile

Buffer→ Allocators→ verifyTcpCapture() — netty Function Reference

Dependency Diagram

graph TD
  d3cfaa8b_8ac2_24f3_97d5_6f3a794d3ad8["verifyTcpCapture()"]
  e9f4993c_4935_9405_4fab_0bbc9030a673["PcapWriteHandlerTest"]
  d3cfaa8b_8ac2_24f3_97d5_6f3a794d3ad8 -->|defined in| e9f4993c_4935_9405_4fab_0bbc9030a673
  d05177b8_4cad_27b7_df18_d8a758cd2b20["tcpV4()"]
  d05177b8_4cad_27b7_df18_d8a758cd2b20 -->|calls| d3cfaa8b_8ac2_24f3_97d5_6f3a794d3ad8
  07a73853_84f6_e5d8_e296_bfc3e041abe7["embeddedTcpClient()"]
  07a73853_84f6_e5d8_e296_bfc3e041abe7 -->|calls| d3cfaa8b_8ac2_24f3_97d5_6f3a794d3ad8
  a98b7b6d_d138_64de_9c04_503805afe540["embeddedTcpServer()"]
  a98b7b6d_d138_64de_9c04_503805afe540 -->|calls| d3cfaa8b_8ac2_24f3_97d5_6f3a794d3ad8
  6d1762df_74cf_d7e4_67fe_139dde76cada["tcpLargePayload()"]
  6d1762df_74cf_d7e4_67fe_139dde76cada -->|calls| d3cfaa8b_8ac2_24f3_97d5_6f3a794d3ad8
  21c06fcc_dfd6_289d_561c_35429e8e3b0e["tcpZeroByteCaptured()"]
  21c06fcc_dfd6_289d_561c_35429e8e3b0e -->|calls| d3cfaa8b_8ac2_24f3_97d5_6f3a794d3ad8
  a9d69f29_7cda_7943_ffb0_c38af67018e1["writePcapGreaterThan4Gb()"]
  a9d69f29_7cda_7943_ffb0_c38af67018e1 -->|calls| d3cfaa8b_8ac2_24f3_97d5_6f3a794d3ad8
  style d3cfaa8b_8ac2_24f3_97d5_6f3a794d3ad8 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

handler/src/test/java/io/netty/handler/pcap/PcapWriteHandlerTest.java lines 1120–1152

    private static void verifyTcpCapture(ByteBuf byteBuf, ByteBuf expectedPayload,
                                         InetSocketAddress destinationAddr, InetSocketAddress sourceAddr,
                                         long sequenceNumber,
                                         long ackNumber) {
        int expectedPayloadLength = expectedPayload.readableBytes();

        // Verify data
        ByteBuf tcpPacket = verifyTcpBaseHeaders(byteBuf, destinationAddr, expectedPayloadLength);

        assertEquals(sourceAddr.getPort() & 0xffff, tcpPacket.readUnsignedShort()); // Source Port
        assertEquals(destinationAddr.getPort() & 0xffff, tcpPacket.readUnsignedShort()); // Destination Port
        assertEquals(sequenceNumber, tcpPacket.readUnsignedInt()); // Sequence number
        assertEquals(ackNumber, tcpPacket.readUnsignedInt()); // Ack number
        tcpPacket.readByte(); // Offset/Reserved
        assertEquals(16, tcpPacket.readByte()); // ACK Control bit
        assertEquals(65535, tcpPacket.readUnsignedShort()); // Window Size
        assertEquals(1, tcpPacket.readUnsignedShort()); // Checksum
        assertEquals(0, tcpPacket.readUnsignedShort()); // Urgent Pointer
        assertArrayEquals(ByteBufUtil.getBytes(expectedPayload), ByteBufUtil.getBytes(tcpPacket));

        // Verify ACK
        tcpPacket = verifyTcpBaseHeaders(byteBuf, sourceAddr, 0);

        assertEquals(destinationAddr.getPort() & 0xffff, tcpPacket.readUnsignedShort()); // Source Port
        assertEquals(sourceAddr.getPort() & 0xffff, tcpPacket.readUnsignedShort()); // Destination Port
        assertEquals(ackNumber, tcpPacket.readUnsignedInt()); // Sequence number
        assertEquals(sequenceNumber + expectedPayloadLength, tcpPacket.readUnsignedInt()); // Ack number
        tcpPacket.readByte(); // Offset/Reserved
        assertEquals(16, tcpPacket.readByte()); // ACK Control bit
        assertEquals(65535, tcpPacket.readUnsignedShort()); // Window Size
        assertEquals(1, tcpPacket.readUnsignedShort()); // Checksum
        assertEquals(0, tcpPacket.readUnsignedShort()); // Urgent Pointer
    }

Domain

Buffer

Subdomains

Allocators

Defined In

handler/src/test/java/io/netty/handler/pcap/PcapWriteHandlerTest.java

Called By

Source

View on GitHub

Frequently Asked Questions

What does verifyTcpCapture() do?

verifyTcpCapture() is a function in the netty codebase, defined in handler/src/test/java/io/netty/handler/pcap/PcapWriteHandlerTest.java.

Where is verifyTcpCapture() defined?

verifyTcpCapture() is defined in handler/src/test/java/io/netty/handler/pcap/PcapWriteHandlerTest.java at line 1120.

What calls verifyTcpCapture()?

verifyTcpCapture() is called by 6 function(s): embeddedTcpClient, embeddedTcpServer, tcpLargePayload, tcpV4, tcpZeroByteCaptured, writePcapGreaterThan4Gb.

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