FBB::Hostent - Wrapper around a struct hostent
#include <bobcat/hostent>
Linking option: -lbobcat
@CLASS objects are wrappers around hostent structs
which may be used by other objects. A struct hostent 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.
The @CLASS objects offer a C++-like interface to this
struct.
FBB
All constructors, members, operators and manipulators, mentioned in this
man-page, are defined in the namespace FBB.
- o
- Hostent(hostent const *hostentPtr):
This constructor initializes an @CLASS object from an existing
hostent struct. Functions like gethostbyname(3) and
gethostbyaddress(3) return pointers to hostent structs.
The default, copy and move constructors (and the copy and move
assignment operators) are available.
- o
- size_t addressLength() const:
This member returns the length of the binary addresses in bytes.
- o
- size_t addressType() const:
This member returns the type of the address. Currently this is always
AF_INET.
- o
- char const *alias(size_t index) const:
This member returns alias `index’ of the host. The first alias
has index 0. If alias `index’ does not exist, 0 is
returned.
- o
- char const * const *beginAlias() const:
This member returns an iterator to the first alias. The hostname itself is
not included in the list of aliases.
- o
- char const *binaryAddress(size_t index) const:
This member returns the binary address `index’ of the host.
The first address has index 0. If address `index’
does not exist, 0 is returned. The pointer to the binary address points to
a series of addressLength() bytes. Note that the returned address
is in network byte order. It can be converted to host byte
order by the functions described in byteorder(3).
- o
- std::string dottedDecimalAddress(size_t index) const:
This member returns address `index’ as a dotted decimal
address in a string. The first address has index 0. If address
`index’ does not exist, an empty string is returned.
- o
- char const * const *endAlias() const:
This member returns an iterator pointing beyond the last alias.
- o
- char const *hostname() const:
This member returns the standard (first) name of the host.
- o
- size_t nAddresses() const:
This member returns the number of addresses that are available. When
requesting a particular address, the requested index should be less than
the value returned by this member.
- o
- size_t nAliases() const:
This member returns the number of aliases that are available. When
requesting a particular alias, the requested index should be less than the
value returned by this member.
- o
- void swap(Hostent &other):
The current Hostent object’s content are swapped with the
other object’s content.
#include <iostream>
#include <algorithm>
#include <iterator>
#include <bobcat/hostent>
using namespace std;
using namespace FBB;
int main(int argc, char **argv)
{
Hostent he(gethostbyname("localhost"));
cout << "The local hostname = " << he.hostname() << endl;
cout << "All aliases: " << endl;
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;
}
bobcat/hostent - defines the class interface
- o
- https://fbb-git.gitlab.io/bobcat/: gitlab project page;
- o
- bobcat_6.02.02-x.dsc: detached signature;
- o
- bobcat_6.02.02-x.tar.gz: source archive;
- o
- bobcat_6.02.02-x_i386.changes: change log;
- o
- libbobcat1_6.02.02-x_*.deb: debian package containing the
libraries;
- o
- libbobcat1-dev_6.02.02-x_*.deb: debian package containing the
libraries, headers and manual pages;
Bobcat is an acronym of `Brokken’s Own Base Classes And
Templates’.
This is free software, distributed under the terms of the GNU
General Public License (GPL).
Frank B. Brokken (f.b.brokken@rug.nl).