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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#include "AsyncNameResolver.h"
#include <cstring>
#include "A2STR.h"
#include "LogFactory.h"
#include "SocketCore.h"
#include "util.h"
namespace aria2 {
void callback(void* arg, int status, int timeouts, struct hostent* host)
{
AsyncNameResolver* resolverPtr = reinterpret_cast<AsyncNameResolver*>(arg);
if(status != ARES_SUCCESS) {
resolverPtr->error_ = ares_strerror(status);
resolverPtr->status_ = AsyncNameResolver::STATUS_ERROR;
return;
}
for(char** ap = host->h_addr_list; *ap; ++ap) {
char addrstring[NI_MAXHOST];
if(inetNtop(host->h_addrtype, *ap, addrstring, sizeof(addrstring)) == 0) {
resolverPtr->resolvedAddresses_.push_back(addrstring);
}
}
if(resolverPtr->resolvedAddresses_.empty()) {
resolverPtr->error_ = "no address returned or address conversion failed";
resolverPtr->status_ = AsyncNameResolver::STATUS_ERROR;
} else {
resolverPtr->status_ = AsyncNameResolver::STATUS_SUCCESS;
}
}
AsyncNameResolver::AsyncNameResolver
(int family
#ifdef HAVE_ARES_ADDR_NODE
, ares_addr_node* servers
#endif // HAVE_ARES_ADDR_NODE
)
: status_(STATUS_READY),
family_(family)
{
// TODO evaluate return value
ares_init(&channel_);
#if defined(HAVE_ARES_SET_SERVERS) && defined(HAVE_ARES_ADDR_NODE)
if(servers) {
// ares_set_servers has been added since c-ares 1.7.1
if(ares_set_servers(channel_, servers) != ARES_SUCCESS) {
A2_LOG_DEBUG("ares_set_servers failed");
}
}
#endif // HAVE_ARES_SET_SERVERS && HAVE_ARES_ADDR_NODE
}
AsyncNameResolver::~AsyncNameResolver()
{
ares_destroy(channel_);
}
void AsyncNameResolver::resolve(const std::string& name)
{
hostname_ = name;
status_ = STATUS_QUERYING;
ares_gethostbyname(channel_, name.c_str(), family_, callback, this);
}
int AsyncNameResolver::getFds(fd_set* rfdsPtr, fd_set* wfdsPtr) const
{
return ares_fds(channel_, rfdsPtr, wfdsPtr);
}
void AsyncNameResolver::process(fd_set* rfdsPtr, fd_set* wfdsPtr)
{
ares_process(channel_, rfdsPtr, wfdsPtr);
}
#ifdef HAVE_LIBCARES
int AsyncNameResolver::getsock(sock_t* sockets) const
{
return ares_getsock(channel_, reinterpret_cast<ares_socket_t*>(sockets),
ARES_GETSOCK_MAXNUM);
}
void AsyncNameResolver::process(ares_socket_t readfd, ares_socket_t writefd)
{
ares_process_fd(channel_, readfd, writefd);
}
#endif // HAVE_LIBCARES
bool AsyncNameResolver::operator==(const AsyncNameResolver& resolver) const
{
return this == &resolver;
}
void AsyncNameResolver::reset()
{
hostname_ = A2STR::NIL;
resolvedAddresses_.clear();
status_ = STATUS_READY;
ares_destroy(channel_);
// TODO evaluate return value
ares_init(&channel_);
}
#ifdef HAVE_ARES_ADDR_NODE
ares_addr_node* parseAsyncDNSServers(const std::string& serversOpt)
{
std::vector<std::string> servers;
util::split(std::begin(serversOpt), std::end(serversOpt),
std::back_inserter(servers), ',', true /* doStrip */);
ares_addr_node root;
root.next = nullptr;
ares_addr_node* tail = &root;
for (const auto& s: servers) {
auto node = make_unique<ares_addr_node>();
size_t len = net::getBinAddr(&node->addr, s.c_str());
if(len != 0) {
node->next = nullptr;
node->family = (len == 4 ? AF_INET : AF_INET6);
tail->next = node.release();
tail = tail->next;
}
}
return root.next;
}
#endif // HAVE_ARES_ADDR_NODE
} // namespace aria2
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