124 lines
3.3 KiB
C++
124 lines
3.3 KiB
C++
/*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* Copyright 2017 Danny Robson <danny@nerdcruft.net>
|
|
*/
|
|
|
|
#include "socket.hpp"
|
|
|
|
#include "except.hpp"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netdb.h>
|
|
#include <netinet/in.h>
|
|
#include <netinet/tcp.h>
|
|
|
|
using util::posix::socket;
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
class lookup {
|
|
public:
|
|
lookup (const util::view<const char*> host, int port):
|
|
m_addresses (nullptr, freeaddrinfo)
|
|
{
|
|
struct ::addrinfo hints {};
|
|
hints.ai_family = AF_UNSPEC;
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
|
|
const struct {
|
|
std::string host;
|
|
std::string port;
|
|
} strings {
|
|
.host = std::string (std::begin (host), std::end (host)),
|
|
.port = std::to_string (port)
|
|
};
|
|
|
|
addrinfo* _addresses;
|
|
util::posix::eai::try_code (
|
|
getaddrinfo (
|
|
strings.host.c_str (),
|
|
strings.port.c_str (),
|
|
&hints,
|
|
&_addresses
|
|
)
|
|
);
|
|
|
|
m_addresses.reset (_addresses);
|
|
};
|
|
|
|
auto begin (void) const { return m_addresses.get (); }
|
|
auto end (void) const { return nullptr; }
|
|
|
|
private:
|
|
std::unique_ptr<addrinfo[],void(*)(addrinfo*)> m_addresses;
|
|
};
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
static util::posix::fd
|
|
connect_host (const util::view<const char*> host, int port)
|
|
{
|
|
for (const auto &info: lookup { host, port }) {
|
|
util::posix::fd sock {
|
|
socket (info.ai_family, info.ai_socktype, info.ai_protocol)
|
|
};
|
|
if (sock == -1)
|
|
continue;
|
|
|
|
if (connect (sock, info.ai_addr, info.ai_addrlen))
|
|
continue;
|
|
|
|
return sock;
|
|
}
|
|
|
|
throw std::runtime_error ("unable to connect");
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
socket::socket (int domain, int type):
|
|
socket (domain, type, 0)
|
|
{ ; }
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
socket::socket (int domain, int type, int protocol):
|
|
fd (::socket (domain, type, protocol))
|
|
{ ; }
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
socket::socket (util::view<const char*> host, int port):
|
|
fd (connect_host (host, port))
|
|
{ ; }
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
socket::~socket ()
|
|
{ ; }
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
void
|
|
socket::connect (util::view<const char*> host, int port)
|
|
{
|
|
for (const auto &info: lookup { host, port }) {
|
|
if (!::connect (*this, info.ai_addr, info.ai_addrlen))
|
|
return;
|
|
}
|
|
|
|
throw std::runtime_error ("unable to reconnect");
|
|
}
|