Parse HTTP packets -- C #,

Parse HTTP packets -- C #,

Currently, no parsing method is found in the. Net Framework. Theoretically, HttpClient and other classes should have implemented parsing internally, but I do not know why these methods have not been published. (Or I didn't find it) so I had to parse the data myself.

public enum HTTPHeaderField{Accept = 0,Accept_Charset = 1,Accept_Encoding = 2,Accept_Language = 3,Accept_Ranges = 4,Authorization = 5,Cache_Control = 6,Connection = 7,Cookie = 8,Content_Length = 9,Content_Type = 10,Date = 11,Expect = 12,From = 13,Host = 14,If_Match = 15,If_Modified_Since = 16,If_None_Match = 17,If_Range = 18,If_Unmodified_Since = 19,Max_Forwards = 20,Pragma = 21,Proxy_Authorization = 22,Range = 23,Referer = 24,TE = 25,Upgrade = 26,User_Agent = 27,Via = 28,Warn = 29,Age = 30,Allow = 31,Content_Encoding = 32,Content_Language = 33,Content_Location = 34,Content_Disposition = 35,Content_MD5 = 36,Content_Range = 37,ETag = 38,Expires = 39,Last_Modified = 40,Location = 41,Proxy_Authenticate = 42,Refresh = 43,Retry_After = 44,Server = 45,Set_Cookie = 46,Trailer = 47,Transfer_Encoding = 48,Vary = 49,Warning = 50,WWW_Authenticate = 51};class HTTPHeader{#region PROPERTIESprivate string[] m_StrHTTPField = new string[52];private byte[] m_byteData = new byte[4096];public string[] HTTPField{get { return m_StrHTTPField; }set { m_StrHTTPField = value; }}public byte[] Data{get { return m_byteData; }set { m_byteData = value; }}#endregion// convertionSystem.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();#region CONSTRUCTEUR/// <summary>/// Constructeur par défaut - non utilisé/// </summary>private HTTPHeader(){ }public HTTPHeader(byte[] ByteHTTPRequest){string HTTPRequest = encoding.GetString(ByteHTTPRequest);try{int IndexHeaderEnd;string Header;// Si la taille de requête est supérieur ou égale à 1460, alors toutes la chaine est l'entête httpif (HTTPRequest.Length <= 1460)Header = HTTPRequest;else{IndexHeaderEnd = HTTPRequest.IndexOf("\r\n\r\n");Header = HTTPRequest.Substring(0, IndexHeaderEnd);Data = ByteHTTPRequest.Skip(IndexHeaderEnd + 4).ToArray();}HTTPHeaderParse(Header);}catch (Exception){ }}#endregion#region METHODESprivate void HTTPHeaderParse(string Header){#region HTTP HEADER REQUEST & RESPONSEHTTPHeaderField HHField;string HTTPfield, buffer;int Index;foreach (int IndexHTTPfield in Enum.GetValues(typeof(HTTPHeaderField))){HHField = (HTTPHeaderField)IndexHTTPfield;HTTPfield = "\n" + HHField.ToString().Replace('_', '-') + ": "; //Ajout de \n devant pour éviter les doublons entre cookie et set_cookie// Si le champ n'est pas présent dans la requête, on passe au champ suivantIndex = Header.IndexOf(HTTPfield);if (Index == -1)continue;buffer = Header.Substring(Index + HTTPfield.Length);Index = buffer.IndexOf("\r\n");if (Index == -1)m_StrHTTPField[IndexHTTPfield] = buffer.Trim();elsem_StrHTTPField[IndexHTTPfield] = buffer.Substring(0, Index).Trim();//Console.WriteLine("Index = " + IndexHTTPfield + " | champ = " + HTTPfield.Substring(1) + " " + m_StrHTTPField[IndexHTTPfield]);}// Affichage de tout les champs/*for (int j = 0; j < m_StrHTTPField.Length; j++){HHField = (HTTPHeaderField)j;Console.WriteLine("m_StrHTTPField[" + j + "]; " + HHField + " = " + m_StrHTTPField[j]);}*/#endregion}#endregion}

Write the following code to parse the file:

Class Program {static void Main (string [] args) {SRART: Console. writeLine ("Enter the complete path of the HTTP packet data file to be parsed:"); var filename = Console. readLine (); try {FileStream fs = new FileStream (filename, FileMode. open); BinaryReader br = new BinaryReader (fs); var data = br. readBytes (int) fs. length); var header = new HTTPHeader (data); var x = 0; foreach (var f in header. HTTPField) {if (! String. isNullOrEmpty (f) {Console. writeLine ($ "[{x: 00}]-{(HTTPHeaderField) x }:{ f}") ;}x ++;} Console. writeLine ($ "total data size {fs. length} bytes, actual data size {header. data. length} Byte "); Console. writeLine (Encoding. UTF8.GetString (header. data); Console. writeLine (); br. close (); fs. close ();} catch (Exception e) {Console. writeLine (e) ;}goto SRART ;}}

Gzip decompression and character decoding are not implemented here, And UTF8 is used to decode the output directly. (Write it again when necessary. It's all physical work ~)