FBB::GetHostent(3bobcat)
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. However, the
default- and copy-constructors are available.
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::Errno 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::Errno 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)
{ - if (argc == 1)
{cerr << "Provide a host name or host address to solve\n";
return 1; - }
- try
{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 (Errno const &err)
{ - cout << err.what() << endl;
return 1; - }
return 0; - }
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.
DISTRIBUTION FILES
o bobcat_2.08.01-x.dsc: detached signature;
o bobcat_2.08.01-x.tar.gz: source archive;
o bobcat_2.08.01-x_i386.changes: change log;
- o libbobcat1_2.08.01-x_*.deb: debian package holding the
- libraries;
- o libbobcat1-dev_2.08.01-x_*.deb: debian package holding the
- libraries, headers and manual pages;
- o http://sourceforge.net/projects/bobcat: public archive location;
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).