sipfrag.cxx

一个著名的SIP协议栈

#if defined(HAVE_CONFIG_H)
#include "resip/stack/config.hxx"
#endif

#include "resip/stack/MsgHeaderScanner.hxx"
#include "resip/stack/SipFrag.hxx"
#include "resip/stack/SipMessage.hxx"
#include "rutil/Logger.hxx"
#include "rutil/ParseBuffer.hxx"
#include "rutil/WinLeakCheck.hxx"

using namespace resip;
using namespace std;

#define RESIPROCATE_SUBSYSTEM Subsystem::SIP

bool
SipFrag::init()
{
   static ContentsFactory<SipFrag> factory;
   (void)factory;
   return true;
}

SipFrag::SipFrag(const Mime& contentsType)
   : Contents(contentsType),
     mMessage(new SipMessage())
{}

SipFrag::SipFrag(HeaderFieldValue* hfv, const Mime& contentsType)
   : Contents(hfv, contentsType),
     mMessage(0)
{
}

SipFrag::SipFrag(const SipFrag& rhs)
   : Contents(rhs,HeaderFieldValue::CopyPadding),
     mMessage(rhs.mMessage ? new SipMessage(*rhs.mMessage) : 0)
{
}

SipFrag::~SipFrag()
{
   delete mMessage;
}

SipFrag&
SipFrag::operator=(const SipFrag& rhs)
{
   if (this != &rhs)
   {
      Contents::operator=(rhs);
      delete mMessage;
      if (rhs.mMessage)
      {
         mMessage = new SipMessage(*rhs.mMessage);
      }
      else
      {
         mMessage = 0;
      }
   }
   
   return *this;
}

Contents* 
SipFrag::clone() const
{
   return new SipFrag(*this);
}

const Mime& 
SipFrag::getStaticType() 
{
   static Mime type("message", "sipfrag");
   //static Mime type("application", "sipfrag");
   return type;
}

SipMessage& 
SipFrag::message() 
{
   checkParsed(); 
   return *mMessage;
}

const SipMessage& 
SipFrag::message() const 
{
   checkParsed(); 
   return *mMessage;
}

std::ostream& 
SipFrag::encodeParsed(std::ostream& str) const
{
   mMessage->encodeSipFrag(str);

   return str;
}

bool 
SipFrag::hasStartLine(char* buffer, int size)
{
#if 0
   //!dcm! -- this probably inefficient, but the SIP grammer makes this very
   //difficult. Better here than in the MsgHeaderScanner. There's also proabably a
   //way to make a header that matches the requestLine check which isn't a
   //request line.

   ParseBuffer pbCheck(buffer, size);
   pbCheck.skipWhitespace(); //gratuitous?

   //!dcm! -- could extend to SIP/2.0, but nobody should start a hname with SIP/
   if ((pbCheck.end() - pbCheck.position()) > 4 &&
      strncmp(pbCheck.position(), "SIP/", 4) == 0)
   {
      return true;
   }
   else
   {
      pbCheck.skipToChars(Symbols::CRLF);
      if (pbCheck.eof()) 
      {
         //false positive, let MsgHeaderScanner sort the exact error out
         return true; 
      }
      
      pbCheck.skipBackToChar(Symbols::SPACE[0]);
      if (pbCheck.position() == pbCheck.start()) 
      {
         return false;
      }
         
      if ((pbCheck.end() - pbCheck.position()) > 4 &&
          strncmp(pbCheck.position(), "SIP/", 4) == 0)
      {
         return true;
      }
      else
      {
         return false;
      }
   }
#else   
   //!dcm! -- better approach, remove above if this is proven to be correct
   ParseBuffer pbCheck(buffer, size);
   pbCheck.skipWhitespace(); //gratuitous?
   pbCheck.skipToOneOf(" \t:\r\n");
   while(!pbCheck.eof())
   {
      switch(*pbCheck.position())
      {
         case ':':
            return false;
         case ' ':
         case '\t':
            pbCheck.skipChar();
            break;             
         case '\r':
         case '\n':
            return false;
         default:
            return true;
      }
   }
   return true;  //false positive, let MsgHeaderScanner sort the exact error out
#endif
}

void 
SipFrag::parse(ParseBuffer& pb)
{
//   DebugLog(<< "SipFrag::parse: " << pb.position());

   mMessage = new SipMessage();

   pb.assertNotEof();
   const char *constBuffer = pb.position();
   char *buffer = const_cast<char *>(constBuffer);

   size_t size = pb.end() - pb.position();

   // !ah! removed size check .. process() cannot process more
   // than size bytes of the message.


   MsgHeaderScanner msgHeaderScanner;
   msgHeaderScanner.prepareForFrag(mMessage, hasStartLine(buffer, size));
   enum { sentinelLength = 4 };  // Two carriage return / line feed pairs.
   //char saveTermCharArray[sentinelLength];
   static char* sentinel="\r\n\r\n";
   char *termCharArray = buffer + size;
   memcpy(scratchpad,termCharArray,4);
   
   /*saveTermCharArray[0] = termCharArray[0];
   saveTermCharArray[1] = termCharArray[1];
   saveTermCharArray[2] = termCharArray[2];
   saveTermCharArray[3] = termCharArray[3];*/
   
   memcpy(termCharArray,sentinel,4);
   /*termCharArray[0] = '\r';
   termCharArray[1] = '\n';
   termCharArray[2] = '\r';
   termCharArray[3] = '\n';*/
   char *scanTermCharPtr;
   MsgHeaderScanner::ScanChunkResult scanChunkResult =
       msgHeaderScanner.scanChunk(buffer,
                                  size + sentinelLength,
                                  &scanTermCharPtr);
   
   memcpy(termCharArray,scratchpad,4);
   /*termCharArray[0] = saveTermCharArray[0];
   termCharArray[1] = saveTermCharArray[1];
   termCharArray[2] = saveTermCharArray[2];
   termCharArray[3] = saveTermCharArray[3];*/
   
   // !dlb! not at all clear what to do here
   // see: "// tests end of message problem (MsgHeaderScanner?)"
   //      in test/testSipFrag.cxx
   if (false && scanChunkResult != MsgHeaderScanner::scrEnd) 
   {
      CerrLog(<< "not MsgHeaderScanner::scrEnd");
      pb.fail(__FILE__, __LINE__);
   } 
   else 
   {
      size_t used = scanTermCharPtr - buffer;

      // !ah! I think this is broken .. if we are UDP then the 
      // remainder is the SigFrag, not the Content-Length... ??
      if (mMessage->exists(h_ContentLength))
      {
         mMessage->setBody(scanTermCharPtr,
                           static_cast<int>(size - used));
      }
      else
      {
         // !ah! So the headers weren't complete. Why are we here?
         // !dlb! 
         if (mMessage->exists(h_ContentLength))
         {
            pb.reset(buffer + used);
            pb.skipChars(Symbols::CRLF);
            mMessage->setBody(pb.position(),int(pb.end()-pb.position()) );
         }
      }
      pb.reset(pb.end());
   }
}

/* ====================================================================
 * The Vovida Software License, Version 1.0 
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