AresDns.hxx

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#if !defined(RESIP_ARES_DNS_HXX)
#define RESIP_ARES_DNS_HXX

#include "rutil/FdSetIOObserver.hxx"
#include "rutil/GenericIPAddress.hxx"
#include "rutil/dns/ExternalDns.hxx"

extern "C"
{
struct ares_channeldata;
}

//struct fd_set;

extern "C" {
  void resip_AresDns_aresCallback(void *arg, int status, unsigned char* abuf, int alen);
  void resip_AresDns_caresCallback(void *arg, int status, int timeouts, unsigned char* abuf, int alen);
}

namespace resip
{
class AresDnsPollItem;
class FdPollGrp;

class AresDns : public ExternalDns, public FdSetIOObserver
{
   friend class AresDnsPollItem;
   public:
      AresDns() {mChannel = 0; mFeatures = 0; mPollGrp=NULL;}
      virtual ~AresDns();

      virtual int init(const std::vector<GenericIPAddress>& additionalNameservers,
                       AfterSocketCreationFuncPtr socketfunc, int timeout=0, int tries=0, unsigned int features=0);

      int internalInit(const std::vector<GenericIPAddress>& additionalNameservers,
                       AfterSocketCreationFuncPtr socketfunc, unsigned int features=0, ares_channeldata** channel = 0, int timeout=0, int tries=0);

      virtual bool checkDnsChange();

      virtual unsigned int getTimeTillNextProcessMS();
      virtual void process(FdSet& fdset);
      virtual void buildFdSet(FdSet& fdset);

      virtual void buildFdSet(fd_set& read, fd_set& write, int& size);
      virtual void process(fd_set& read, fd_set& write);

      virtual void setPollGrp(FdPollGrp *pollGrp);
      virtual void processTimers();

      //?dcm?  I believe these need to do nothing in the ARES case.
      virtual void freeResult(ExternalDnsRawResult /* res */) {}
      virtual void freeResult(ExternalDnsHostResult /* res */) {}

      virtual char* errorMessage(long errorCode);

      void lookup(const char* target, unsigned short type, ExternalDnsHandler* handler, void* userData);

      virtual bool hostFileLookup(const char* target, in_addr &addr);
      virtual bool hostFileLookupLookupOnlyMode() { return mHostFileLookupOnlyMode; }
      static void enableHostFileLookupOnlyMode(bool enable) { mHostFileLookupOnlyMode = enable; }

      friend void ::resip_AresDns_aresCallback(void *arg, int status, unsigned char* abuf, int alen);
      friend void ::resip_AresDns_caresCallback(void *arg, int status, int timeouts, unsigned char* abuf, int alen);

      // used for epoll() interface to ares lib
      // time_t mNow;

   private:

      typedef std::pair<ExternalDnsHandler*, void*> Payload;
      static ExternalDnsRawResult makeRawResult(void *arg, int status, unsigned char *abuf, int alen);
      static ExternalDnsHandler* getHandler(void* arg);
      struct ares_channeldata* mChannel;
      std::vector<GenericIPAddress> mAdditionalNameservers;
      unsigned int mFeatures;
      volatile static bool mHostFileLookupOnlyMode;

      FdPollGrp*        mPollGrp;
      std::vector<AresDnsPollItem*> mPollItems;

};

}


#endif

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