NAME

       FBB::GetHostent - Obtain hostent struct from hostname or -address

SYNOPSIS

       #include <bobcat/gethostent>
       Linking option: -lbobcat

DESCRIPTION

       FBB::GetHostent  objects  produce  hostent  structs  which  may  be used by other types of
       objects. The FBB::GetHostent class is therefore primarily used as a base-class  for  other
       classes  and is seldomly used `stand-alone’. The hostent structs are static structs, but a
       non-static copy may be obtained using an FBB::Hostent object.

       A hostent struct is defined as follows:

           struct hostent
           {
               char    *h_name;        // official name of host
               char    **h_aliases;    // alias list
               int     h_addrtype;     // host address type (always AF_INET)
               int     h_length;       // length of address
               char    **h_addr_list;  // list of addresses
           }

       The address fields are binary values of the addresses,  each  address  requiring  h_length
       bytes,  the  last  address  being  equal  to  0.  These  binary values may be converted to
       character-representations  by  the  addressToString()  member,  which  uses   inet_ntop(),
       internally.

NAMESPACE

       FBB
       All  constructors,  members,  operators  and manipulators, mentioned in this man-page, are
       defined in the namespace FBB.

INHERITS FROM

       -

CONSTRUCTORS

       All members of the class FBB::GetHostent are static. Consequently, there  is  no  need  to
       construct a FBB::GetHostent object.

STATIC MEMBERS

       o      hostent    const    *gethostent(char    const   *errorprefix,   std::string   const
              &nameOrAddress):
              The gethostent() member returns a pointer to a static struct hostent.  It  contains
              the information about the host whose name or dotted decimal address was provided as
              its second argument. Its first argument is an error string  prefix,  prefixing  the
              error message in an FBB::Exception object. Such an object is thrown as an exception
              when the host’s information could not be retrieved.

       o      std::string addressToString(char const *errorprefix, void const *ads):
              This member returns the dotted decimal address of the host whose binary address  is
              provided  at ads. Its first argument is an error string prefix, prefixing the error
              message in an FBB::Exception object. Such an object is thrown as an exception  when
              the dotted decimal address could not be determined.

              The class’ members can only be used when the host whose name or address is searched
              can be resolved by a name resolution process, e.g., bind(1).

EXAMPLE

           #include <iostream>
           #include <algorithm>
           #include <iterator>

           #include <bobcat/hostent>
           #include <bobcat/gethostent>

           using namespace std;
           using namespace FBB;

           int main(int argc, char **argv)
           try
           {
               if (argc == 1)
               {
                   cerr << "Provide a host name or host address to solve\n";
                   return 1;
               }

               Hostent he(GetHostent::gethostent(argv[1], argv[1]));
               cout << "Hostname: " << he.hostname() << endl;

               cout << "Aliases:\n";
               copy(he.beginAlias(), he.endAlias(),
                       ostream_iterator<char const *>(cout, "\n"));

               cout << "Addresses:\n";
               for (size_t idx = 0; idx < he.nAddresses(); idx++)
                   cout << he.dottedDecimalAddress(idx) << endl;
           }
           catch (Exception const &err)
           {
               cout << err.what() << endl;
               return 1;
           }

FILES

       bobcat/gethostent - defines the class interface

SEE ALSO

       bind(1),     bobcat(7),     gethostbyaddr(3)      gethostbyname(3),      hostent(3bobcat),
       inetaddress(3bobcat), inet_ntop(3)

BUGS

       None Reported.

BOBCAT PROJECT FILES

       o      https://fbb-git.gitlab.io/bobcat/: gitlab project page;

       o      bobcat_5.11.01-x.dsc: detached signature;

       o      bobcat_5.11.01-x.tar.gz: source archive;

       o      bobcat_5.11.01-x_i386.changes: change log;

       o      libbobcat1_5.11.01-x_*.deb: debian package containing the libraries;

       o      libbobcat1-dev_5.11.01-x_*.deb:  debian  package  containing the libraries, headers
              and manual pages;

BOBCAT

       Bobcat is an acronym of `Brokken’s Own Base Classes And Templates’.

COPYRIGHT

       This is free software, distributed under the terms  of  the  GNU  General  Public  License
       (GPL).

AUTHOR

       Frank B. Brokken (f.b.brokken@rug.nl).