.TH "FBB::GetHostent" "3bobcat" "2005\-2020" "libbobcat\-dev_5\&.07\&.00" "Host information"

.PP 
.SH "NAME"
FBB::GetHostent \- Obtain \fBhostent\fP struct from hostname or \-address
.PP 
.SH "SYNOPSIS"
\fB#include <bobcat/gethostent>\fP
.br 
Linking option: \fI\-lbobcat\fP 
.PP 
.SH "DESCRIPTION"
\fBFBB::GetHostent\fP objects produce \fIhostent\fP structs which may
be used by other types of objects\&. The \fBFBB::GetHostent\fP class is therefore
primarily used as a base\-class for other classes and is seldomly used
`stand\-alone\(cq\&\&. The \fIhostent\fP structs are static structs, but a
non\-static copy may be obtained using an \fBFBB::Hostent\fP object\&.
.PP 
A \fIhostent\fP struct is defined as follows:
.nf 

    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 
    }
        
.fi 
The \fIaddress\fP fields are binary values of the addresses, each address
requiring \fIh_length\fP bytes, the last address being equal to 0\&. These binary
values may be converted to character\-representations by the
\fIaddressToString()\fP member, which uses \fBinet_ntop()\fP, internally\&.
.PP 
.SH "NAMESPACE"
\fBFBB\fP
.br 
All constructors, members, operators and manipulators, mentioned in this
man\-page, are defined in the namespace \fBFBB\fP\&.
.PP 
.SH "INHERITS FROM"
\-
.PP 
.SH "CONSTRUCTORS"
All members of the class \fBFBB::GetHostent\fP are static\&. Consequently,
there is no need to construct a \fBFBB::GetHostent\fP object\&. 
.PP 
.SH "STATIC MEMBERS"
.IP o 
\fBhostent const *gethostent(char const *errorprefix, 
std::string const &nameOrAddress)\fP:
.br 
The \fBgethostent()\fP member returns a pointer to a static \fBstruct
hostent\fP\&. 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 \fBFBB::Exception\fP
object\&. Such an object is thrown as an exception when the host\(cq\&s information
could not be retrieved\&.
.IP o 
\fBstd::string addressToString(char const *errorprefix, 
void const *ads)\fP:
.br 
This member returns the dotted decimal address of the host whose
binary address is provided at \fBads\fP\&. Its first argument is an error string
prefix, prefixing the error message in an \fBFBB::Exception\fP object\&. Such an
object is thrown as an exception when the dotted decimal address could not be
determined\&.
.IP 
The class\(cq\& members can only be used when the host whose name or address is
searched can be resolved by a name resolution process, e\&.g\&., \fBbind\fP(1)\&.

.PP 
.SH "EXAMPLE"
.nf 

    #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 << \(dq\&Provide a host name or host address to solve\en\(dq\&;
            return 1;
        }
    
        Hostent he(GetHostent::gethostent(argv[1], argv[1]));
        cout << \(dq\&Hostname: \(dq\& << he\&.hostname() << endl;

        cout << \(dq\&Aliases:\en\(dq\&;
        copy(he\&.beginAlias(), he\&.endAlias(), 
                ostream_iterator<char const *>(cout, \(dq\&\en\(dq\&));

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

.PP 
.SH "FILES"
\fIbobcat/gethostent\fP \- defines the class interface
.PP 
.SH "SEE ALSO"
\fBbind\fP(1),
\fBbobcat\fP(7), 
\fBgethostbyaddr\fP(3)
\fBgethostbyname\fP(3),  
\fBhostent\fP(3bobcat),
\fBinetaddress\fP(3bobcat),
\fBinet_ntop\fP(3)
.PP 
.SH "BUGS"
None Reported\&.
.PP 
.SH "BOBCAT PROJECT FILES"

.PP 
.IP o 
\fIhttps://fbb\-git\&.gitlab\&.io/bobcat/\fP: gitlab project page;
.IP o 
\fIbobcat_5\&.07\&.00\-x\&.dsc\fP: detached signature;
.IP o 
\fIbobcat_5\&.07\&.00\-x\&.tar\&.gz\fP: source archive;
.IP o 
\fIbobcat_5\&.07\&.00\-x_i386\&.changes\fP: change log;
.IP o 
\fIlibbobcat1_5\&.07\&.00\-x_*\&.deb\fP: debian package containing the
libraries;
.IP o 
\fIlibbobcat1\-dev_5\&.07\&.00\-x_*\&.deb\fP: debian package containing the
libraries, headers and manual pages;

.PP 
.SH "BOBCAT"
Bobcat is an acronym of `Brokken\(cq\&s Own Base Classes And Templates\(cq\&\&.
.PP 
.SH "COPYRIGHT"
This is free software, distributed under the terms of the 
GNU General Public License (GPL)\&.
.PP 
.SH "AUTHOR"
Frank B\&. Brokken (\fBf\&.b\&.brokken@rug\&.nl\fP)\&.
.PP