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Util.cs

using System;
using System.Threading;
using System.Net.Sockets;
using bareFTP.Protocol.Sftp.Streams;

namespace bareFTP.Protocol.Sftp
{
      /* -*-mode:java; c-basic-offset:2; -*- */
      /*
      Copyright (c) 2002,2003,2004 ymnk, JCraft,Inc. All rights reserved.

      Redistribution and use in source and binary forms, with or without
      modification, are permitted provided that the following conditions are met:

        1. Redistributions of source code must retain the above copyright notice,
             this list of conditions and the following disclaimer.

        2. Redistributions in binary form must reproduce the above copyright 
             notice, this list of conditions and the following disclaimer in 
             the documentation and/or other materials provided with the distribution.

        3. The names of the authors may not be used to endorse or promote products
             derived from this software without specific prior written permission.

      THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
      INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
      FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
      INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
      INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
      OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
      LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
      NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
      EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      */


      public class Util
      {

            /// <summary>
            /// Converts a time_t to DateTime
            /// </summary>
            public static DateTime Time_T2DateTime(uint time_t) 
            {
                  long win32FileTime = 10000000*(long)time_t + 116444736000000000;
                  return DateTime.FromFileTimeUtc(win32FileTime).ToLocalTime();
            }

            /*
            private static byte[] b64 = System.Text.Encoding.Default.GetBytes( "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=");
            
            private static byte val(byte foo)
            {
                  if(foo == '=') return 0;
                  for(int j=0; j<b64.Length; j++)
                  {
                        if(foo==b64[j]) return (byte)j;
                  }
                  return 0;
            }
            */
            internal static byte[] fromBase64(byte[] buf, int start, int length)
            {
                  string s = System.Text.Encoding.Default.GetString(buf, start, length);
                  return Convert.FromBase64String(s);
                  
            }
            internal static byte[] toBase64(byte[] buf, int start, int length)
            {
                  return System.Text.Encoding.Default.GetBytes(Convert.ToBase64String(buf, start, length));
            }
            
            
            internal static bool glob(byte[] pattern, byte[] name)
            {
                  return glob(pattern, 0, name, 0);
            }
            private static bool glob(byte[] pattern, int pattern_index,
                  byte[] name, int name_index)
            {
                  int patternlen=pattern.Length;
                  if(patternlen==0)
                        return false;
                  int namelen=name.Length;
                  int i=pattern_index;
                  int j=name_index;
                  while(i<patternlen && j<namelen)
                  {
                        if(pattern[i]=='\\')
                        {
                              if(i+1==patternlen)
                                    return false;
                              i++;
                              if(pattern[i]!=name[j]) return false;
                              i++; j++;
                              continue;
                        }
                        if(pattern[i]=='*')
                        {
                              if(patternlen==i+1) return true;
                              i++;
                              byte foo=pattern[i];
                              while(j<namelen)
                              {
                                    if(foo==name[j])
                                    {
                                          if(glob(pattern, i, name, j))
                                          {
                                                return true;
                                          }
                                    }
                                    j++;
                              }
                              return false;

                        }
                        if(pattern[i]=='?')
                        {
                              i++; j++;
                              continue;
                        }
                        if(pattern[i]!=name[j]) return false;
                        i++; j++;
                        continue;
                  }
                  if(i==patternlen && j==namelen) return true;
                  return false;
            }

            private static String[] chars={
                                                              "0","1","2","3","4","5","6","7","8","9", "a","b","c","d","e","f"
                                                        };
            internal static string getFingerPrint(HASH hash, byte[] data)
            {
                  try
                  {
                        hash.init();
                        hash.update(data, 0, data.Length);
                        byte[] foo=hash.digest();
                        System.Text.StringBuilder sb = new System.Text.StringBuilder();
                        uint bar;
                        for(int i=0; i<foo.Length;i++)
                        {
                              bar=(byte)(foo[i]&0xff);
                              sb.Append(chars[(bar>>4)&0xf]);
                              sb.Append(chars[(bar)&0xf]);
                              if(i+1<foo.Length)
                                    sb.Append(":");
                        }
                        return sb.ToString();
                  }
                  catch
                  {
                        return "???";
                  }
            }
                  

            internal static Socket createSocket(string host, int port, int timeout) 
            {
                  Socket socket=null;
                  string message="";
                  if(timeout==0)
                  {
                        try
                        {
                              System.Net.IPEndPoint ep = new System.Net.IPEndPoint(System.Net.Dns.GetHostEntry(host).AddressList[0], port);
                              socket = new Socket(ep.AddressFamily,
                            SocketType.Stream, System.Net.Sockets.ProtocolType.Tcp);
                          socket.Connect(ep);
                                    
                              return socket;
                        }
                        catch(Exception e)
                        {
                              message=e.ToString();
                              throw new Exception(message);
                        }
                  }
                  String _host=host;
                  int _port=port;
                  Socket[] sockp = new Socket[1];
                  
                  Exception[] ee = new Exception[1];
                  message="";
                  
                  createSocketRun runnable = new createSocketRun(sockp, ee, _host, _port);
                  
                  Thread tmp=new Thread(new ThreadStart(runnable.run));
                  tmp.Name = "Opening Socket "+host;
                  tmp.Start();
                  
                  try
                  { 
                        tmp.Join(timeout);
                        message="timeout: ";
                  }
                  catch(ThreadInterruptedException)
                  {
                  }
                  if(sockp[0]!=null && sockp[0].Connected)
                  {
                        socket=sockp[0];
                  }
                  else
                  {
                        message+="socket is not established";
                        if(ee[0]!=null)
                        {
                              message=ee[0].ToString();
                        }
                        tmp.Interrupt();
                        tmp=null;
                        throw new Exception(message);
                  }
                  return socket;
            }

            private class createSocketRun
            {
                  Socket[] sockp;
                  Exception[] ee;
                  string _host;
                  int _port;

                  public createSocketRun(Socket[] sockp, Exception[] ee, string _host, int _port)
                  {
                        this.sockp=sockp;
                        this.ee=ee;
                        this._host=_host;
                        this._port=_port;
                  }

                  public void run()
                  {
                        sockp[0]=null;
                        try
                        {
                              System.Net.IPEndPoint ep = new System.Net.IPEndPoint(System.Net.Dns.GetHostEntry(_host).AddressList[0], _port);
                              sockp[0] = new Socket(ep.AddressFamily, SocketType.Stream, System.Net.Sockets.ProtocolType.Tcp);
                              sockp[0].Connect(ep);
                              
                        }
                        catch(Exception e)
                        {
                              ee[0]=e;
                              if(sockp[0]!=null && sockp[0].Connected)
                              {
                                    try
                                    {
                                          sockp[0].Close();
                                    }
                                    catch(Exception){}
                              }
                              sockp[0]=null;
                        }
                  }
            }

            internal static bool array_equals(byte[] foo, byte[] bar)
            {
                  
                  int i=foo.Length;
                  if(i!=bar.Length) return false;
                  for(int j=0; j<i; j++){ if(foo[j]!=bar[j]) return false; }
                  //try{while(true){i--; if(foo[i]!=bar[i])return false;}}catch(Exception e){}
                  return true;
            }

            public static string getString(byte[] arr, int offset, int len)
            {
                  return System.Text.Encoding.Default.GetString(arr, offset, len);
            }
            public static string getStringUTF8(byte[] arr, int offset, int len)
            {
                  return System.Text.Encoding.UTF8.GetString(arr, offset, len);
            }

            public static string getString(byte[] arr)
            {
                  return getString(arr, 0, arr.Length);
            }
            public static string getStringUTF8(byte[] arr)
            {
                  return getStringUTF8(arr, 0, arr.Length);
            }

            public static byte[] getBytes(String str)
            {
                  return System.Text.Encoding.Default.GetBytes( str );
            }
            public static byte[] getBytesUTF8(String str)
            {
                  return System.Text.Encoding.UTF8.GetBytes( str );
            }

            public static bool regionMatches(String orig, bool ignoreCase, int toffset,
                  String other, int ooffset, int len) 
            {
                  char[] ta = new char[orig.Length];
                  char[] pa = new char[other.Length];
                  orig.CopyTo(0, ta, 0, orig.Length);
                  int to = toffset;
                  other.CopyTo(0, pa, 0, other.Length);
                  int po = ooffset;
                  // Note: toffset, ooffset, or len might be near -1>>>1.
                  if ((ooffset < 0) || (toffset < 0) || (toffset > (long)orig.Length - len) ||
                        (ooffset > (long)other.Length - len)) 
                  {
                        return false;
                  }
                  while (len-- > 0) 
                  {
                        char c1 = ta[to++];
                        char c2 = pa[po++];
                        if (c1 == c2) 
                        {
                              continue;
                        }
                        if (ignoreCase) 
                        {
                              // If characters don't match but case may be ignored,
                              // try converting both characters to uppercase.
                              // If the results match, then the comparison scan should
                              // continue.
                              char u1 = char.ToUpper(c1);
                              char u2 = char.ToUpper(c2);
                              if (u1 == u2) 
                              {
                                    continue;
                              }
                              // Unfortunately, conversion to uppercase does not work properly
                              // for the Georgian alphabet, which has strange rules about case
                              // conversion.  So we need to make one last check before
                              // exiting.
                              if (char.ToLower(u1) == char.ToLower(u2)) 
                              {
                                    continue;
                              }
                        }
                        return false;
                  }
                  return true;
            }

            public static uint ToUInt32( byte [] ptr ,int Index)
            {
                  uint ui = 0;

                  ui = ( (uint) ptr[ Index++ ] ) << 24; 
                  ui += ( (uint) ptr[ Index++ ] ) << 16;
                  ui += ( (uint) ptr[ Index++ ] ) << 8;
                  ui += (uint) ptr[ Index++ ];

                  return ui;
            }

            public static int ToInt32( byte [] ptr ,int Index)
            {
                  return (int)ToUInt32( ptr, Index );
            }

            public static ushort ToUInt16( byte [] ptr , int Index)
            {
                  ushort u = 0;

                  u = ( ushort ) ptr[ Index++ ];
                  u *= 256;
                  u += ( ushort ) ptr[ Index++ ];

                  return u;
            }
            public static bool ArrayContains( Object[] arr, Object o)
            {
                  for(int i=0; i<arr.Length; i++)
                  {
                        if (arr[i].Equals(o))
                              return true;
                  }
                  return false;
            }
            public static bool ArrayContains( char[] arr, char c)
            {
                  for(int i=0; i<arr.Length; i++)
                  {
                        if (arr[i] == c)
                              return true;
                  }
                  return false;
            }
            public static bool ArrayContains( char[] arr, char c, int count)
            {
                  for(int i=0; i<count; i++)
                  {
                        if (arr[i] == c)
                              return true;
                  }
                  return false;
            }

            /**
            * Utility method to delete the leading zeros from the modulus.
            * @param a modulus
            * @return modulus
            */
            public static byte[] stripLeadingZeros(byte[] a) 
            {
                  int lastZero = -1;
                  for (int i = 0; i < a.Length; i++) 
                  {
                        if (a[i] == 0) 
                        {
                              lastZero = i;
                        }
                        else 
                        {
                              break;
                        }
                  }
                  lastZero++;
                  byte[] result = new byte[a.Length - lastZero];
                  Array.Copy(a, lastZero, result, 0, result.Length);
                  return result;
            }

            /*
            Based on: http://www.orlingrabbe.com/dsa_java.htm
            And on: http://groups.google.com/group/comp.lang.java.security/browse_thread/thread/8f3bb93f9348434f/a1681ec252084483?lnk=st&q=ASN.1+signature+dsa+format&rnum=5&hl=en#a1681ec252084483
            If you're asking about the SHA/DSA signature format from 
            java.security.Signature, it looks like this, for example: 

            % od -tx1 sig 
            0000000 30 2c 02 14 4f 01 01 92 24 7c b3 c7 af 76 71 92 
            0000020 9c db c7 fe 1f 4e 42 4f 02 14 78 f3 63 d5 a3 0e 
            0000040 be 7d 92 7c 43 8d 0f 5f 02 df ee 35 9e b2 


            It's DER format, with 0x30 meaning SEQUENCE, 0x2c the length of the 
            sequence, 0x02 meaning INTEGER, and 0x14 the length of the integer. 
            The first integer (as a byte array) is r, and the second one is s. 

            */
            public static byte[] FixDsaSig( byte[] sig )
            {
                  byte[] newSig = new byte[40];
                  Array.Copy(sig, 4, newSig, 0, 20);
                  int index;
                  if(sig.Length==46)
                        index = 26;
                  else if(sig.Length==47)
                        index = 27;
                  else 
                        throw new Exception("Can't fix DSA Signature.");
                  Array.Copy(sig, index, newSig, 20, 20);
                  return newSig;
            }
                  
            public static string hex(byte[] arr)
            {
                  string hex = "0x";
                  for(int i=0;i<arr.Length; i++)
                  {
                        string mbyte = arr[i].ToString("X");
                        if (mbyte.Length == 1)
                              mbyte = "0"+mbyte;
                        hex += mbyte;
                  }
                  return hex;
            }

            public static void Dump(string fileName, byte[] bytes)
            {
                  System.IO.FileStream s = new System.IO.FileStream(fileName, System.IO.FileMode.OpenOrCreate);
                  s.Write(bytes, 0, bytes.Length);
                  s.Flush();
                  s.Close();
            }

            internal static string unquote(string _path)
            {
                  byte[] path = System.Text.Encoding.UTF8.GetBytes(_path);
                  int pathlen=path.Length;
                  int i=0;
                  while(i<pathlen)
                  {
                        if(path[i]=='\\')
                        {
                              if(i+1==pathlen)
                                    break;
                              arraycopy(path, i+1, path, i, path.Length-(i+1));
                              pathlen--;
                              continue;
                        }
                        i++;
                  }
                  if(pathlen==path.Length)return _path;
                  byte[] foo=new byte[pathlen];
                  arraycopy(path, 0, foo, 0, pathlen);
                  return System.Text.Encoding.UTF8.GetString(foo);
            }
            
            internal static bool equals(byte[] foo, byte[] bar)
            {
                  int i=foo.Length;
                  if(i!=bar.Length) return false;
                  for(int j=0; j<i; j++){ if(foo[j]!=bar[j]) return false; }
                  return true;
            }
            
            public static void arraycopy(Array a1, long sourceIndex, Array a2, long destIndex, long len)
            {
                  Array.Copy(a1, sourceIndex, a2, destIndex, len);
            }
            
            public static long skip(System.IO.Stream s, long len)
            {
                  
                  int i=0;
                  int count = 0;
                  byte[] buf = new byte[len];
                  while(len>0)
                  {
                        i=s.Read(buf, count, (int)len);//tamir: possible lost of pressision
                        if(i<=0)
                        {
                              throw new Exception("Stream is closed");
                              //return (s-foo)==0 ? i : s-foo;
                        }
                        count+=i;
                        len-=i;
                  }
                  return count;
                  
            }
                  
            public static int available(System.IO.Stream s)
            {
                  if(s is Streams.PipedInputStream)
                  {
                        return ((PipedInputStream)s).available();
                  }
                  throw new Exception("JStream.available() -- Method not implemented");
            }
      }
}
      



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