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/*
* Copyright (C) 2001-2004 Peter J Jones (pjones@pmade.org)
* All Rights Reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of the Author nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/** @file
* This file contains the implementation of the resolve_hostname function
* using the gethostbyname system call.
**/
// common header
#include "common.h"
// Netxx includes
#include "resolve.h"
#include "netxx/types.h"
#include "sockaddr.h"
// standard includes
#include <cstring>
//####################################################################
void Netxx::resolve_hostname (const char *hostname, port_type port, bool use_ipv6, std::vector<Peer> &addrs)
{
{ // first try to see if this address is already an IPv4 address
SockAddr saddr(AF_INET, port);
sockaddr_in *sai = reinterpret_cast<sockaddr_in*>(saddr.get_sa());;
if (inet_pton(AF_INET, hostname, &(sai->sin_addr)) == 1) {
addrs.push_back(Peer(hostname, port, sai, saddr.get_sa_size()));
return;
}
}
#ifndef NETXX_NO_INET6
if (use_ipv6) { // now try to see if this address is already an IPv6 address
SockAddr saddr(AF_INET6, port);
sockaddr_in6 *sai6 = reinterpret_cast<sockaddr_in6*>(saddr.get_sa());
if (inet_pton(AF_INET6, hostname, &(sai6->sin6_addr)) == 1) {
addrs.push_back(Peer(hostname, port, sai6, saddr.get_sa_size()));
return;
}
}
#endif
/*
* if we got this far then the address must really be a hostname so
* we are going to have to call gethostbyname and either pull it out
* of the hosts file or go to DNS. And don't forget NIS and WINS and
* ...
*/
hostent *he; // WARNING not MT safe
if ( (he = gethostbyname(hostname)) == 0) {
std::string error("name resolution failure for "); error += hostname;
// HACK: Winsock uses a totally different error reporting mechanism.
#ifdef WIN32
error += ": "; error += str_error(get_last_error());
#else
error += ": "; error += hstrerror(h_errno);
#endif
throw NetworkException(error);
}
for (char **ii = he->h_addr_list; *ii != 0; ++ii) {
switch (he->h_addrtype) {
case AF_INET:
{
SockAddr saddr(AF_INET, port);
sockaddr_in *sai = reinterpret_cast<sockaddr_in*>(saddr.get_sa());
std::memcpy(&(sai->sin_addr), *ii, sizeof(sai->sin_addr));
addrs.push_back(Peer(he->h_name, port, sai, saddr.get_sa_size()));
}
break;
#ifndef NETXX_NO_INET6
case AF_INET6:
{
SockAddr saddr(AF_INET6, port);
sockaddr_in6 *sai6 = reinterpret_cast<sockaddr_in6*>(saddr.get_sa());
std::memcpy(&(sai6->sin6_addr), *ii, sizeof(sai6->sin6_addr));
addrs.push_back(Peer(he->h_name, port, sai6, saddr.get_sa_size()));
}
break;
#endif
}
}
}
//####################################################################
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