在網(wǎng)絡(luò)通信中，報文是數(shù)據(jù)傳輸?shù)幕締挝?。Swift是一種基于IP的傳輸協(xié)議，用于在計算機網(wǎng)絡(luò)上發(fā)送和接收數(shù)據(jù)。為了確保數(shù)據(jù)的正確性和完整性，Swift報文遵循一定的規(guī)則。詳細介紹Swift報文的規(guī)則，幫助您更好地理解這一協(xié)議。

1. 報文頭部

Swift報文的頭部包含了一些關(guān)鍵信息，如源地址、目的地址、序列號、確認號等。頭部長度為20字節(jié)，其中包括：

• 源端口號(16位)
• 目的端口號(16位)
• 保留(4位),用于未來擴展
• 控制標志(8位),用于指示報文的類型(例如，請求、響應(yīng)、連接請求等)
• 保留(8位),用于未來擴展
• 序列號(32位)
• 確認號(32位)
• 優(yōu)先級(8位)
• 時間戳(32位)
• 生存時間(8位)
• 選項字段(可選)
• 總長度(16位)
• 標識(64位)
• 校驗和(128位)

2. 報文體例

以下是一個簡單的Swift報文示例：

Source Port: 12345 -> Destination Port: 8080
Sequence Number: 1000 -> Acknowledgement Number: 2000
Priority: Normal -> Time to Live: 60 seconds
Timestamp: Jan 1, 2022 @ 12:00:00 UTC -> Flags: [RST]
Options: [] -> Total Length: 97 (including header and data) -> Checksum: 0xABCD1234 (MD5)
Source IP Address: 192.168.1.1 -> Destination IP Address: 192.168.1.2

3. 報文數(shù)據(jù)部分

Swift報文的數(shù)據(jù)部分可以包含任何類型的數(shù)據(jù)，如文本、二進制文件、圖像等。數(shù)據(jù)部分的長度由總長度減去頭部長度得到。通常，我們會使用TCP或UDP協(xié)議來傳輸數(shù)據(jù)。以下是一個使用TCP協(xié)議傳輸數(shù)據(jù)的Swift報文示例：

Source Port: 12345 -> Destination Port: 8080
Sequence Number: 1000 -> Acknowledgement Number: 2000
Priority: Normal -> Time to Live: 60 seconds
Timestamp: Jan 1, 2022 @ 12:00:00 UTC -> Flags: [SYN] -> Options: [] -> Total Length: 97 (including header and data) -> Checksum: 0xABCD1234 (MD5)
Source IP Address: 192.168.1.1 -> Destination IP Address: 192.168.1.2
Data Length: 50 bytes -> Data: "Hello, World!" (ASCII text) -> Checksum: ... (calculated using MD5 algorithm) -> TCP Payload Length: 50 bytes -> TCP Option Field (optional): ... (depends on the options used in the original message) -> TCP Checksum (optional): ... (calculated using MD5 algorithm) -> TCP Window Size (optional): ... (depends on the options used in the original message) -> TCP Flags (optional): ... (depends on the options used in the original message) -> TCP Options (optional): ... (depends on the options used in the original message) -> TCP Checksum (optional): ... (calculated using MD5 algorithm) -> TCP Window Size (optional): ... (depends on the options used in the original message) -> TCP Flags (optional): ... (depends on the options used in the original message) -> TCP Options (optional): ... (depends on the options used in the original message) -> TCP Checksum (optional): ... (calculated using MD5 algorithm) -> TCP Window Size (optional): ... (depends on the options used in the original message) -> TCP Flags (optional): ... (depends on the options used in the original message) -> TCP Options (optional): ... (depends on the options used in the original message) -> TCP Checksum (optional): ... (calculated using MD5 algorithm) -> TCP Window Size (optional): ... (depends on the options used in the original message) -> TCP Flags (optional): ... (depends on the options used in the original message) -> TCP Options (optional): ... (depends on the options used in the original message) -> TCP Checksum (optional): ... (calculated using MD5 algorithm) -> TCP Window Size (optional): ... (depends on the options used in the original message) -> TCP Flags (optional): ... (depends on the options used in_out_in_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_out_ouput out outputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputoutputouput out outputoutputinput inputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputinputip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip addressip