#include <Resolver.hxx>

Collaboration diagram for resip::Resolver:

Public Member Functions
	Resolver (const Uri &url)
	Resolver (const Data &host, int port, TransportType transport)
Static Public Member Functions
static bool	isIpAddress (const Data &data)
static Data	getHostName ()
Public Attributes
std::list< Tuple >	mNextHops
Private Member Functions
void	lookupARecords ()
Private Attributes
TransportType	mTransport
Data	mHost
int	mPort

Detailed Description

Definition at line 16 of file Resolver.hxx.

Constructor & Destructor Documentation

Resolver::Resolver ( const Uri & url )

Definition at line 29 of file Resolver.cxx.

References resip::Data::c_str(), DebugLog, errno, resip::Uri::exists(), isIpAddress(), lookupARecords(), mHost, mNextHops, mPort, mTransport, resip::Uri::scheme(), resip::Symbols::Sip, resip::Symbols::Sips, strerror(), resip::TCP, and resip::UDP.

                                 : 
   mHost(uri.host()),
   mPort(uri.port() ? uri.port() : 5060)
{
   bool isNumeric = isIpAddress(mHost);
   if (!uri.exists(p_transport) )
   {
      if (isNumeric)
      {
         if (uri.scheme() == Symbols::Sip)
         {
            mTransport = UDP;
         }
         else if (uri.scheme() == Symbols::Sips)
         {
            mTransport = TCP;
         }
      }
      else // not numeric
      {
         if (1) // uri.portSpecified()) // !jf!
         {
            if (uri.scheme() == Symbols::Sip)
            {
               mTransport = UDP;
            }
            else if (uri.scheme() == Symbols::Sips)
            {
               mTransport = TCP;
            }
         }
         else // NAPTR query - yuck! 
         {
            // Rohan, step up to the plate buddy.
            mTransport = UDP; // !jf! not done yet
         }
      }
   }

   if (!isNumeric)
   {
      if (1) // !jf! uri.portSpecified())
      {
         lookupARecords();
         // do an A or AAAA DNS lookup
         
      }
      else
      {
         // do SRV lookup on result of NAPTR lookup
         
         // if no NAPTR lookup, do SRV lookup on _sips for sips and _sip for sip
         
         // if no result on SRV lookup, do an A or AAAA lookup
         
      }
   }
   else
   {
      Tuple tuple;
      if (inet_pton(AF_INET, mHost.c_str(), &tuple.ipv4.s_addr) <= 0)
      {
         DebugLog( << "inet_pton failed to parse address: " << mHost << " " << strerror(errno));
         assert(0);
      }
      tuple.port = mPort;
      tuple.transportType = mTransport;
      
      mNextHops.push_back(tuple);
   }
   
}

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Resolver::Resolver	(	const Data &	host,
		int	port,
		TransportType	transport
	)

Definition at line 103 of file Resolver.cxx.

References resip::Data::c_str(), DebugLog, errno, isIpAddress(), lookupARecords(), mHost, mNextHops, mPort, mTransport, and strerror().

   :  mTransport(transport),
      mHost(host),
      mPort(port)
{
   bool isNumeric = isIpAddress(mHost);
   if (!isNumeric)
   {
      if (1) // !jf! uri.portSpecified())
      {
         lookupARecords();
         // do an A or AAAA DNS lookup
         
      }
      else
      {
         // do SRV lookup on result of NAPTR lookup
         
         // if no NAPTR lookup, do SRV lookup on _sips for sips and _sip for sip
         
         // if no result on SRV lookup, do an A or AAAA lookup
         
      }
   }
   else
   {
      Tuple tuple;
      if (inet_pton(AF_INET, mHost.c_str(), &tuple.ipv4.s_addr) <= 0)
      {
         DebugLog( << "inet_pton failed to parse address: " << mHost << " " << strerror(errno));
         assert(0);
      }
      tuple.port = mPort;
      tuple.transportType = mTransport;
      
      mNextHops.push_back(tuple);
   }
}

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Member Function Documentation

Data Resolver::getHostName ( ) [static]

Definition at line 229 of file Resolver.cxx.

References errno, InfoLog, and strerror().

{
   char buffer[255];
   if (gethostname(buffer, sizeof(buffer)) < 0)
   {
      InfoLog (<< "Failed gethostname() " << strerror(errno));
      return "localhost";
   }
   else
   {
      return Data(buffer);
   }
}

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bool Resolver::isIpAddress ( const Data & data ) [static]

Definition at line 208 of file Resolver.cxx.

References resip::Data::c_str(), and resip::Data::size().

Referenced by Resolver().

{
   // ok, this is fairly monstrous but it works. 
   unsigned int p1,p2,p3,p4;
   int count=0;
   int result = sscanf( data.c_str(), 
                        "%u.%u.%u.%u%n",
                        &p1, &p2, &p3, &p4, &count );

   if ( (result == 4) && (p1 <= 255) && (p2 <= 255) && (p3 <= 255) && (p4 <= 255) && (count == int(data.size())) )
   {
      return true;
   }
   else
   {
      return false;
   }
}

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void Resolver::lookupARecords ( ) [private]

Definition at line 144 of file Resolver.cxx.

References resip::Data::c_str(), DebugLog, InfoLog, mHost, mNextHops, mPort, and mTransport.

Referenced by Resolver().

{
   struct hostent hostbuf; 
   struct hostent* result=0;

   int herrno=0;
   char buffer[8192];
#ifdef __QNX__
   result = gethostbyname_r (mHost.c_str(), &hostbuf, buffer, sizeof(buffer), &herrno);
   if (result == 0)
   {
#else

#if defined( WIN32 ) || defined( __APPLE__ ) || defined (__SUNPRO_CC) || defined(__FreeBSD__)
        assert(0); // !cj! 
        int ret = -1;
#else
        int ret = gethostbyname_r (mHost.c_str(), &hostbuf, buffer, sizeof(buffer), &result, &herrno);
#endif
   assert (ret != ERANGE);

   if (ret != 0)
   {
#endif
      switch (herrno)
      {
         case HOST_NOT_FOUND:
            InfoLog ( << "host not found: " << mHost);
            break;
         case NO_DATA:
            InfoLog ( << "no data found for: " << mHost);
            break;
         case NO_RECOVERY:
            InfoLog ( << "no recovery lookup up: " << mHost);
            break;
         case TRY_AGAIN:
            InfoLog ( << "try again: " << mHost);
            break;
      }
   }
   else
   {
      assert(result);
      assert(result->h_length == 4);
   
      DebugLog (<< "DNS lookup of " << mHost << ": canonical name: " << result->h_name);
      char str[256];
      for (char** pptr = result->h_addr_list; *pptr != 0; pptr++)
      {
         Tuple tuple;
         tuple.ipv4.s_addr = *((u_int32_t*)(*pptr));
         tuple.port = mPort;
         tuple.transportType = mTransport;

         mNextHops.push_back(tuple);
#ifndef WIN32
         DebugLog (<< inet_ntop(AF_INET, &tuple.ipv4.s_addr, str, sizeof(str)));
#endif

      }
   }
}