/usr/include/dclib-0.3/dclib/core/cnetaddr.h is in libdc-dev 0.3.24~svn3121-2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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cnetaddr.h - dclib network address functions
-------------------
begin : Sat Aug 30 2008
copyright : (C) 2001-2003 by Mathias Küster
copyright : (C) 2008 by Edward Sheldrake
email : ejs1920@yahoo.co.uk
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef CNETADDR_H
#define CNETADDR_H
/**
* @author Mathias Küster, Edward Sheldrake.
*
* IP address functions, mainly the DNS lookup, but also getting the
* address from network interfaces and some utility functions.
*
* Moved out of CSocket and gethostbyname() was replaced with getaddrinfo().
* Mutex not required by getaddrinfo().
*
* Most of the names got shortened and end with I4 to indicate they
* work with IPv4 addresses, and most functions take an optional CString*
* for returning any error message.
*
* On WIN32 this class won't work until CSocket::SysInit() has initialised
* WinSock2, dclibInitDepLibs() handles that and any other libraries.
*/
#include <dclib/dcos.h>
#include <dclib/core/cstring.h>
#include <dclib/core/clist.h>
class CNetAddr {
public:
/**
* Gets the list of network interfaces on this machine.
* If there is some problem and error is not null then
* if will be set to the error message.
*
* Returns the number of interfaces in the list.
*/
static long GetInterfaceList( CList<CString> * interfaceList, CString * error = 0 );
/**
* Returns the IPv4 address for the network interface.
* If there was some problem an empty string is returned
* and if error is not null then it will be set to the error message.
*/
static CString GetInterfaceI4( CString hwif, CString * error = 0 );
/**
* Puts the first IPv4 address for the host into sin.sin_addr and returns true.
* If lookup fails returns false and sets error if it is not null.
*/
static bool GetHostI4( const char * host, struct sockaddr_in * sin, CString * error = 0 );
/**
* Returns the first IPv4 address for the host as a CString.
* If lookup fails returns an empty string and sets error if it is not null.
*/
static CString GetHostI4( CString host, CString * error = 0 );
/**
* Splits host and port.
*/
static void ParseHost( CString host, CString & ip, unsigned int & port );
/**
* Returns true if the IPv4 address (in dots and numbers format)
* is in one of the private address space blocks.
*/
static bool IsPrivateI4( const char * ip );
/**
* Returns true if the ip address (in dots and numbers format)
* is a valid IPv4 address.
*/
static bool IsValidI4( const char * ip );
protected:
/** Constructor - not created, all functions static */
CNetAddr() {};
/** Destructor - not destroyed, all functions static */
~CNetAddr() {};
};
#endif // CNETADDR_H
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