Host.h

//
//  Copyright (c) 1994, 1995, 2006 by Mike Romberg ( mike.romberg@noaa.gov )
//
//  This file may be distributed under terms of the GPL
//

#ifndef _Host_h
#define _Host_h

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <iostream>

class Host {
public:
  Host(const char *hostname);
  Host(const struct in_addr *address);
  Host(unsigned int addr);
  Host(const Host& host) { copy(host); _failure = host._failure; }
  virtual ~Host(void);

  Host &operator=(const Host& host) {
    clear();
    copy(host);
    _failure = host._failure;

    return *this;
  }

  bool operator==(const Host& host) const;
  bool operator!=(const Host& host) const { return !(*this == host); }

  // indicates a valid Host.
  bool valid(void) const { return _valid; }
  operator bool(void) const { return _valid; }
  int reasonForFailure(void) const;  // returns h_errno at time of failure
  bool tryAgain(void) const;         // Ok to try again?

  const char *officialName(void) const { return _hent.h_name; }

  int numAliases(void) const { return _numAliases; }
  const char *alias(int num) const { return _hent.h_aliases[num]; }

  int addrType(void) const { return _hent.h_addrtype; }
  int addrLength(void) const { return _hent.h_length; }

  int numAddresses(void) const { return _numAddresses; }
  struct in_addr *address(int num) const {
    return (in_addr *)_hent.h_addr_list[num];
  }

  // Linux will choke and die inside of inet_ntoa() when
  // this function is called.  The Host class has been run
  // through purify and the problem is not in it.  Must be
  // another linux library problem :(.
  const char *strAddress(int num) const { return inet_ntoa(*address(num)); }

  // Should not use this under linux for the same reashon as the above
  // function.
  std::ostream &print(std::ostream &os) const;

protected:
private:
  struct hostent _hent;
  int _numAliases;
  int _numAddresses;
  bool _valid;
  int  _failure;

  void copy(const Host& host) { copy(&host._hent); }
  void copy(const struct hostent *hent);
  void clear(void);
  bool check(const struct hostent *hent);
  bool constuct(const struct in_addr *address);
};

// Do not use this under linux until inet_ntoa() is fixed.
inline std::ostream &operator<<(std::ostream &os, const Host& host) {
  return host.print(os);
}

#endif