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deluge/include/libtorrent/asio/detail/socket_ops.hpp

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//
// socket_ops.hpp
// ~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2006 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef ASIO_DETAIL_SOCKET_OPS_HPP
#define ASIO_DETAIL_SOCKET_OPS_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/push_options.hpp"
#include "asio/detail/push_options.hpp"
#include <boost/config.hpp>
#include <cstdlib>
#include <cstring>
#include <cerrno>
#include <boost/detail/workaround.hpp>
#include <new>
#if defined(__MACH__) && defined(__APPLE__)
# include <AvailabilityMacros.h>
#endif // defined(__MACH__) && defined(__APPLE__)
#include "asio/detail/pop_options.hpp"
#include "asio/error.hpp"
#include "asio/detail/socket_types.hpp"
namespace asio {
namespace detail {
namespace socket_ops {
inline int get_error()
{
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
return WSAGetLastError();
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
return errno;
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline void set_error(int error)
{
errno = error;
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
WSASetLastError(error);
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
template <typename ReturnType>
inline ReturnType error_wrapper(ReturnType return_value)
{
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
errno = WSAGetLastError();
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
return return_value;
}
inline socket_type accept(socket_type s, socket_addr_type* addr,
socket_addr_len_type* addrlen)
{
set_error(0);
#if defined(__MACH__) && defined(__APPLE__)
socket_type new_s = error_wrapper(::accept(s, addr, addrlen));
if (new_s == invalid_socket)
return new_s;
int optval = 1;
int result = error_wrapper(::setsockopt(new_s,
SOL_SOCKET, SO_NOSIGPIPE, &optval, sizeof(optval)));
if (result != 0)
{
::close(new_s);
return invalid_socket;
}
return new_s;
#else
return error_wrapper(::accept(s, addr, addrlen));
#endif
}
inline int bind(socket_type s, const socket_addr_type* addr,
socket_addr_len_type addrlen)
{
set_error(0);
return error_wrapper(::bind(s, addr, addrlen));
}
inline int close(socket_type s)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
return error_wrapper(::closesocket(s));
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
return error_wrapper(::close(s));
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline int shutdown(socket_type s, int what)
{
set_error(0);
return error_wrapper(::shutdown(s, what));
}
inline int connect(socket_type s, const socket_addr_type* addr,
socket_addr_len_type addrlen)
{
set_error(0);
return error_wrapper(::connect(s, addr, addrlen));
}
inline int listen(socket_type s, int backlog)
{
set_error(0);
return error_wrapper(::listen(s, backlog));
}
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
typedef WSABUF buf;
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
typedef iovec buf;
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
inline void init_buf(buf& b, void* data, size_t size)
{
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
b.buf = static_cast<char*>(data);
b.len = static_cast<u_long>(size);
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
b.iov_base = data;
b.iov_len = size;
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline void init_buf(buf& b, const void* data, size_t size)
{
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
b.buf = static_cast<char*>(const_cast<void*>(data));
b.len = static_cast<u_long>(size);
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
b.iov_base = const_cast<void*>(data);
b.iov_len = size;
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline int recv(socket_type s, buf* bufs, size_t count, int flags)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
// Receive some data.
DWORD recv_buf_count = static_cast<DWORD>(count);
DWORD bytes_transferred = 0;
DWORD recv_flags = flags;
int result = error_wrapper(::WSARecv(s, bufs,
recv_buf_count, &bytes_transferred, &recv_flags, 0, 0));
if (result != 0)
return -1;
return bytes_transferred;
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
msghdr msg;
msg.msg_name = 0;
msg.msg_namelen = 0;
msg.msg_iov = bufs;
msg.msg_iovlen = count;
msg.msg_control = 0;
msg.msg_controllen = 0;
msg.msg_flags = 0;
return error_wrapper(::recvmsg(s, &msg, flags));
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline int recvfrom(socket_type s, buf* bufs, size_t count, int flags,
socket_addr_type* addr, socket_addr_len_type* addrlen)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
// Receive some data.
DWORD recv_buf_count = static_cast<DWORD>(count);
DWORD bytes_transferred = 0;
DWORD recv_flags = flags;
int result = error_wrapper(::WSARecvFrom(s, bufs, recv_buf_count,
&bytes_transferred, &recv_flags, addr, addrlen, 0, 0));
if (result != 0)
return -1;
return bytes_transferred;
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
msghdr msg;
#if defined(__MACH__) && defined(__APPLE__) \
&& (MAC_OS_X_VERSION_MAX_ALLOWED < 1040)
msg.msg_name = reinterpret_cast<char*>(addr);
#else
msg.msg_name = addr;
#endif
msg.msg_namelen = *addrlen;
msg.msg_iov = bufs;
msg.msg_iovlen = count;
msg.msg_control = 0;
msg.msg_controllen = 0;
msg.msg_flags = 0;
int result = error_wrapper(::recvmsg(s, &msg, flags));
*addrlen = msg.msg_namelen;
return result;
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline int send(socket_type s, const buf* bufs, size_t count, int flags)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
// Send the data.
DWORD send_buf_count = static_cast<DWORD>(count);
DWORD bytes_transferred = 0;
DWORD send_flags = flags;
int result = error_wrapper(::WSASend(s, const_cast<buf*>(bufs),
send_buf_count, &bytes_transferred, send_flags, 0, 0));
if (result != 0)
return -1;
return bytes_transferred;
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
msghdr msg;
msg.msg_name = 0;
msg.msg_namelen = 0;
msg.msg_iov = const_cast<buf*>(bufs);
msg.msg_iovlen = count;
msg.msg_control = 0;
msg.msg_controllen = 0;
msg.msg_flags = 0;
#if defined(__linux__)
flags |= MSG_NOSIGNAL;
#endif // defined(__linux__)
return error_wrapper(::sendmsg(s, &msg, flags));
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline int sendto(socket_type s, const buf* bufs, size_t count, int flags,
const socket_addr_type* addr, socket_addr_len_type addrlen)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
// Send the data.
DWORD send_buf_count = static_cast<DWORD>(count);
DWORD bytes_transferred = 0;
int result = ::WSASendTo(s, const_cast<buf*>(bufs), send_buf_count,
&bytes_transferred, flags, addr, addrlen, 0, 0);
if (result != 0)
return -1;
return bytes_transferred;
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
msghdr msg;
#if defined(__MACH__) && defined(__APPLE__) \
&& (MAC_OS_X_VERSION_MAX_ALLOWED < 1040)
msg.msg_name = reinterpret_cast<char*>(const_cast<socket_addr_type*>(addr));
#else
msg.msg_name = const_cast<socket_addr_type*>(addr);
#endif
msg.msg_namelen = addrlen;
msg.msg_iov = const_cast<buf*>(bufs);
msg.msg_iovlen = count;
msg.msg_control = 0;
msg.msg_controllen = 0;
msg.msg_flags = 0;
#if defined(__linux__)
flags |= MSG_NOSIGNAL;
#endif // defined(__linux__)
return error_wrapper(::sendmsg(s, &msg, flags));
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline socket_type socket(int af, int type, int protocol)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
return error_wrapper(::WSASocket(af, type, protocol, 0, 0,
WSA_FLAG_OVERLAPPED));
#elif defined(__MACH__) && defined(__APPLE__)
socket_type s = error_wrapper(::socket(af, type, protocol));
if (s == invalid_socket)
return s;
int optval = 1;
int result = error_wrapper(::setsockopt(s,
SOL_SOCKET, SO_NOSIGPIPE, &optval, sizeof(optval)));
if (result != 0)
{
::close(s);
return invalid_socket;
}
return s;
#else
return error_wrapper(::socket(af, type, protocol));
#endif
}
inline int setsockopt(socket_type s, int level, int optname,
const void* optval, size_t optlen)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
return error_wrapper(::setsockopt(s, level, optname,
reinterpret_cast<const char*>(optval), static_cast<int>(optlen)));
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
return error_wrapper(::setsockopt(s, level, optname, optval,
static_cast<socklen_t>(optlen)));
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline int getsockopt(socket_type s, int level, int optname, void* optval,
size_t* optlen)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
int tmp_optlen = static_cast<int>(*optlen);
int result = error_wrapper(::getsockopt(s, level, optname,
reinterpret_cast<char*>(optval), &tmp_optlen));
*optlen = static_cast<size_t>(tmp_optlen);
return result;
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
socklen_t tmp_optlen = static_cast<socklen_t>(*optlen);
int result = error_wrapper(::getsockopt(s, level, optname,
optval, &tmp_optlen));
*optlen = static_cast<size_t>(tmp_optlen);
return result;
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline int getpeername(socket_type s, socket_addr_type* addr,
socket_addr_len_type* addrlen)
{
set_error(0);
return error_wrapper(::getpeername(s, addr, addrlen));
}
inline int getsockname(socket_type s, socket_addr_type* addr,
socket_addr_len_type* addrlen)
{
set_error(0);
return error_wrapper(::getsockname(s, addr, addrlen));
}
inline int ioctl(socket_type s, long cmd, ioctl_arg_type* arg)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
return error_wrapper(::ioctlsocket(s, cmd, arg));
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
return error_wrapper(::ioctl(s, cmd, arg));
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline int select(int nfds, fd_set* readfds, fd_set* writefds,
fd_set* exceptfds, timeval* timeout)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
if (!readfds && !writefds && !exceptfds && timeout)
{
DWORD milliseconds = timeout->tv_sec * 1000 + timeout->tv_usec / 1000;
if (milliseconds == 0)
milliseconds = 1; // Force context switch.
::Sleep(milliseconds);
return 0;
}
// The select() call allows timeout values measured in microseconds, but the
// system clock (as wrapped by boost::posix_time::microsec_clock) typically
// has a resolution of 10 milliseconds. This can lead to a spinning select
// reactor, meaning increased CPU usage, when waiting for the earliest
// scheduled timeout if it's less than 10 milliseconds away. To avoid a tight
// spin we'll use a minimum timeout of 1 millisecond.
if (timeout && timeout->tv_sec == 0
&& timeout->tv_usec > 0 && timeout->tv_usec < 1000)
timeout->tv_usec = 1000;
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
return error_wrapper(::select(nfds, readfds, writefds, exceptfds, timeout));
}
inline int poll_read(socket_type s)
{
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
FD_SET fds;
FD_ZERO(&fds);
FD_SET(s, &fds);
set_error(0);
return error_wrapper(::select(s, &fds, 0, 0, 0));
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
pollfd fds;
fds.fd = s;
fds.events = POLLIN;
fds.revents = 0;
set_error(0);
return error_wrapper(::poll(&fds, 1, -1));
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline int poll_write(socket_type s)
{
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
FD_SET fds;
FD_ZERO(&fds);
FD_SET(s, &fds);
set_error(0);
return error_wrapper(::select(s, 0, &fds, 0, 0));
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
pollfd fds;
fds.fd = s;
fds.events = POLLOUT;
fds.revents = 0;
set_error(0);
return error_wrapper(::poll(&fds, 1, -1));
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline const char* inet_ntop(int af, const void* src, char* dest, size_t length,
unsigned long scope_id = 0)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
using namespace std; // For memcpy.
if (af != AF_INET && af != AF_INET6)
{
set_error(asio::error::address_family_not_supported);
return 0;
}
sockaddr_storage_type address;
DWORD address_length;
if (af == AF_INET)
{
address_length = sizeof(sockaddr_in4_type);
sockaddr_in4_type* ipv4_address =
reinterpret_cast<sockaddr_in4_type*>(&address);
ipv4_address->sin_family = AF_INET;
ipv4_address->sin_port = 0;
memcpy(&ipv4_address->sin_addr, src, sizeof(in4_addr_type));
}
else // AF_INET6
{
address_length = sizeof(sockaddr_in6_type);
sockaddr_in6_type* ipv6_address =
reinterpret_cast<sockaddr_in6_type*>(&address);
ipv6_address->sin6_family = AF_INET6;
ipv6_address->sin6_port = 0;
ipv6_address->sin6_flowinfo = 0;
ipv6_address->sin6_scope_id = scope_id;
memcpy(&ipv6_address->sin6_addr, src, sizeof(in6_addr_type));
}
DWORD string_length = static_cast<DWORD>(length);
int result = error_wrapper(::WSAAddressToStringA(
reinterpret_cast<sockaddr*>(&address),
address_length, 0, dest, &string_length));
// Windows may not set an error code on failure.
if (result == socket_error_retval && get_error() == 0)
set_error(asio::error::invalid_argument);
return result == socket_error_retval ? 0 : dest;
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
const char* result = error_wrapper(::inet_ntop(af, src, dest, length));
if (result == 0 && get_error() == 0)
set_error(asio::error::invalid_argument);
if (result != 0 && af == AF_INET6 && scope_id != 0)
{
using namespace std; // For strcat and sprintf.
char if_name[IF_NAMESIZE + 1] = "%";
const in6_addr_type* ipv6_address = static_cast<const in6_addr_type*>(src);
bool is_link_local = IN6_IS_ADDR_LINKLOCAL(ipv6_address);
if (!is_link_local || if_indextoname(scope_id, if_name + 1) == 0)
sprintf(if_name + 1, "%lu", scope_id);
strcat(dest, if_name);
}
return result;
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline int inet_pton(int af, const char* src, void* dest,
unsigned long* scope_id = 0)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
using namespace std; // For memcpy and strcmp.
if (af != AF_INET && af != AF_INET6)
{
set_error(asio::error::address_family_not_supported);
return -1;
}
sockaddr_storage_type address;
int address_length = sizeof(sockaddr_storage_type);
int result = error_wrapper(::WSAStringToAddressA(
const_cast<char*>(src), af, 0,
reinterpret_cast<sockaddr*>(&address),
&address_length));
if (af == AF_INET)
{
if (result != socket_error_retval)
{
sockaddr_in4_type* ipv4_address =
reinterpret_cast<sockaddr_in4_type*>(&address);
memcpy(dest, &ipv4_address->sin_addr, sizeof(in4_addr_type));
}
else if (strcmp(src, "255.255.255.255") == 0)
{
static_cast<in4_addr_type*>(dest)->s_addr = INADDR_NONE;
}
}
else // AF_INET6
{
if (result != socket_error_retval)
{
sockaddr_in6_type* ipv6_address =
reinterpret_cast<sockaddr_in6_type*>(&address);
memcpy(dest, &ipv6_address->sin6_addr, sizeof(in6_addr_type));
if (scope_id)
*scope_id = ipv6_address->sin6_scope_id;
}
}
// Windows may not set an error code on failure.
if (result == socket_error_retval && get_error() == 0)
set_error(asio::error::invalid_argument);
return result == socket_error_retval ? -1 : 1;
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
int result = error_wrapper(::inet_pton(af, src, dest));
if (result <= 0 && get_error() == 0)
set_error(asio::error::invalid_argument);
if (result > 0 && af == AF_INET6 && scope_id)
{
using namespace std; // For strchr and atoi.
*scope_id = 0;
if (const char* if_name = strchr(src, '%'))
{
in6_addr_type* ipv6_address = static_cast<in6_addr_type*>(dest);
bool is_link_local = IN6_IS_ADDR_LINKLOCAL(ipv6_address);
if (is_link_local)
*scope_id = if_nametoindex(if_name + 1);
if (*scope_id == 0)
*scope_id = atoi(if_name + 1);
}
}
return result;
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
}
inline int gethostname(char* name, int namelen)
{
set_error(0);
return error_wrapper(::gethostname(name, namelen));
}
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__) \
|| defined(__MACH__) && defined(__APPLE__)
// The following functions are only needed for emulation of getaddrinfo and
// getnameinfo.
inline int translate_netdb_error(int error)
{
switch (error)
{
case 0:
return asio::error::success;
case HOST_NOT_FOUND:
return asio::error::host_not_found;
case TRY_AGAIN:
return asio::error::host_not_found_try_again;
case NO_RECOVERY:
return asio::error::no_recovery;
case NO_DATA:
return asio::error::no_data;
default:
BOOST_ASSERT(false);
return get_error();
}
}
inline hostent* gethostbyaddr(const char* addr, int length, int af,
hostent* result, char* buffer, int buflength, int* error)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
(void)(buffer);
(void)(buflength);
hostent* retval = error_wrapper(::gethostbyaddr(addr, length, af));
*error = get_error();
if (!retval)
return 0;
*result = *retval;
return retval;
#elif defined(__sun) || defined(__QNX__)
hostent* retval = error_wrapper(::gethostbyaddr_r(addr, length, af, result,
buffer, buflength, error));
*error = translate_netdb_error(*error);
return retval;
#elif defined(__MACH__) && defined(__APPLE__)
(void)(buffer);
(void)(buflength);
hostent* retval = error_wrapper(::getipnodebyaddr(addr, length, af, error));
*error = translate_netdb_error(*error);
if (!retval)
return 0;
*result = *retval;
return retval;
#else
hostent* retval = 0;
error_wrapper(::gethostbyaddr_r(addr, length, af, result, buffer,
buflength, &retval, error));
*error = translate_netdb_error(*error);
return retval;
#endif
}
inline hostent* gethostbyname(const char* name, int af, struct hostent* result,
char* buffer, int buflength, int* error, int ai_flags = 0)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
(void)(buffer);
(void)(buflength);
(void)(ai_flags);
if (af != AF_INET)
{
*error = asio::error::address_family_not_supported;
return 0;
}
hostent* retval = error_wrapper(::gethostbyname(name));
*error = get_error();
if (!retval)
return 0;
*result = *retval;
return result;
#elif defined(__sun) || defined(__QNX__)
(void)(ai_flags);
if (af != AF_INET)
{
*error = asio::error::address_family_not_supported;
return 0;
}
hostent* retval = error_wrapper(::gethostbyname_r(name, result, buffer,
buflength, error));
*error = translate_netdb_error(*error);
return retval;
#elif defined(__MACH__) && defined(__APPLE__)
(void)(buffer);
(void)(buflength);
hostent* retval = error_wrapper(::getipnodebyname(
name, af, ai_flags, error));
*error = translate_netdb_error(*error);
if (!retval)
return 0;
*result = *retval;
return retval;
#else
(void)(ai_flags);
if (af != AF_INET)
{
*error = asio::error::address_family_not_supported;
return 0;
}
hostent* retval = 0;
error_wrapper(::gethostbyname_r(name, result, buffer, buflength, &retval,
error));
*error = translate_netdb_error(*error);
return retval;
#endif
}
inline void freehostent(hostent* h)
{
#if defined(__MACH__) && defined(__APPLE__)
if (h)
::freehostent(h);
#else
(void)(h);
#endif
}
// Emulation of getaddrinfo based on implementation in:
// Stevens, W. R., UNIX Network Programming Vol. 1, 2nd Ed., Prentice-Hall 1998.
struct gai_search
{
const char* host;
int family;
};
inline int gai_nsearch(const char* host,
const addrinfo_type* hints, gai_search (&search)[2])
{
int search_count = 0;
if (host == 0 || host[0] == '\0')
{
if (hints->ai_flags & AI_PASSIVE)
{
// No host and AI_PASSIVE implies wildcard bind.
switch (hints->ai_family)
{
case AF_INET:
search[search_count].host = "0.0.0.0";
search[search_count].family = AF_INET;
++search_count;
break;
case AF_INET6:
search[search_count].host = "0::0";
search[search_count].family = AF_INET6;
++search_count;
break;
case AF_UNSPEC:
search[search_count].host = "0::0";
search[search_count].family = AF_INET6;
++search_count;
search[search_count].host = "0.0.0.0";
search[search_count].family = AF_INET;
++search_count;
break;
default:
break;
}
}
else
{
// No host and not AI_PASSIVE means connect to local host.
switch (hints->ai_family)
{
case AF_INET:
search[search_count].host = "localhost";
search[search_count].family = AF_INET;
++search_count;
break;
case AF_INET6:
search[search_count].host = "localhost";
search[search_count].family = AF_INET6;
++search_count;
break;
case AF_UNSPEC:
search[search_count].host = "localhost";
search[search_count].family = AF_INET6;
++search_count;
search[search_count].host = "localhost";
search[search_count].family = AF_INET;
++search_count;
break;
default:
break;
}
}
}
else
{
// Host is specified.
switch (hints->ai_family)
{
case AF_INET:
search[search_count].host = host;
search[search_count].family = AF_INET;
++search_count;
break;
case AF_INET6:
search[search_count].host = host;
search[search_count].family = AF_INET6;
++search_count;
break;
case AF_UNSPEC:
search[search_count].host = host;
search[search_count].family = AF_INET6;
++search_count;
search[search_count].host = host;
search[search_count].family = AF_INET;
++search_count;
break;
default:
break;
}
}
return search_count;
}
template <typename T>
inline T* gai_alloc(std::size_t size = sizeof(T))
{
using namespace std;
T* p = static_cast<T*>(::operator new(size, std::nothrow));
if (p)
memset(p, 0, size);
return p;
}
inline void gai_free(void* p)
{
::operator delete(p);
}
enum { gai_clone_flag = 1 << 30 };
inline int gai_aistruct(addrinfo_type*** next, const addrinfo_type* hints,
const void* addr, int family)
{
using namespace std;
addrinfo_type* ai = gai_alloc<addrinfo_type>();
if (ai == 0)
return EAI_MEMORY;
ai->ai_next = 0;
**next = ai;
*next = &ai->ai_next;
ai->ai_canonname = 0;
ai->ai_socktype = hints->ai_socktype;
if (ai->ai_socktype == 0)
ai->ai_flags |= gai_clone_flag;
ai->ai_protocol = hints->ai_protocol;
ai->ai_family = family;
switch (ai->ai_family)
{
case AF_INET:
{
sockaddr_in4_type* sinptr = gai_alloc<sockaddr_in4_type>();
if (sinptr == 0)
return EAI_MEMORY;
sinptr->sin_family = AF_INET;
memcpy(&sinptr->sin_addr, addr, sizeof(in4_addr_type));
ai->ai_addr = reinterpret_cast<sockaddr*>(sinptr);
ai->ai_addrlen = sizeof(sockaddr_in4_type);
break;
}
case AF_INET6:
{
sockaddr_in6_type* sin6ptr = gai_alloc<sockaddr_in6_type>();
if (sin6ptr == 0)
return EAI_MEMORY;
sin6ptr->sin6_family = AF_INET6;
memcpy(&sin6ptr->sin6_addr, addr, sizeof(in6_addr_type));
ai->ai_addr = reinterpret_cast<sockaddr*>(sin6ptr);
ai->ai_addrlen = sizeof(sockaddr_in6_type);
break;
}
default:
break;
}
return 0;
}
inline addrinfo_type* gai_clone(addrinfo_type* ai)
{
using namespace std;
addrinfo_type* new_ai = gai_alloc<addrinfo_type>();
if (new_ai == 0)
return new_ai;
new_ai->ai_next = ai->ai_next;
ai->ai_next = new_ai;
new_ai->ai_flags = 0;
new_ai->ai_family = ai->ai_family;
new_ai->ai_socktype = ai->ai_socktype;
new_ai->ai_protocol = ai->ai_protocol;
new_ai->ai_canonname = 0;
new_ai->ai_addrlen = ai->ai_addrlen;
new_ai->ai_addr = gai_alloc<sockaddr>(ai->ai_addrlen);
memcpy(new_ai->ai_addr, ai->ai_addr, ai->ai_addrlen);
return new_ai;
}
inline int gai_port(addrinfo_type* aihead, int port, int socktype)
{
int num_found = 0;
for (addrinfo_type* ai = aihead; ai; ai = ai->ai_next)
{
if (ai->ai_flags & gai_clone_flag)
{
if (ai->ai_socktype != 0)
{
ai = gai_clone(ai);
if (ai == 0)
return -1;
// ai now points to newly cloned entry.
}
}
else if (ai->ai_socktype != socktype)
{
// Ignore if mismatch on socket type.
continue;
}
ai->ai_socktype = socktype;
switch (ai->ai_family)
{
case AF_INET:
{
sockaddr_in4_type* sinptr =
reinterpret_cast<sockaddr_in4_type*>(ai->ai_addr);
sinptr->sin_port = port;
++num_found;
break;
}
case AF_INET6:
{
sockaddr_in6_type* sin6ptr =
reinterpret_cast<sockaddr_in6_type*>(ai->ai_addr);
sin6ptr->sin6_port = port;
++num_found;
break;
}
default:
break;
}
}
return num_found;
}
inline int gai_serv(addrinfo_type* aihead,
const addrinfo_type* hints, const char* serv)
{
using namespace std;
int num_found = 0;
if (
#if defined(AI_NUMERICSERV)
(hints->ai_flags & AI_NUMERICSERV) ||
#endif
isdigit(serv[0]))
{
int port = htons(atoi(serv));
if (hints->ai_socktype)
{
// Caller specifies socket type.
int rc = gai_port(aihead, port, hints->ai_socktype);
if (rc < 0)
return EAI_MEMORY;
num_found += rc;
}
else
{
// Caller does not specify socket type.
int rc = gai_port(aihead, port, SOCK_STREAM);
if (rc < 0)
return EAI_MEMORY;
num_found += rc;
rc = gai_port(aihead, port, SOCK_DGRAM);
if (rc < 0)
return EAI_MEMORY;
num_found += rc;
}
}
else
{
// Try service name with TCP first, then UDP.
if (hints->ai_socktype == 0 || hints->ai_socktype == SOCK_STREAM)
{
servent* sptr = getservbyname(serv, "tcp");
if (sptr != 0)
{
int rc = gai_port(aihead, sptr->s_port, SOCK_STREAM);
if (rc < 0)
return EAI_MEMORY;
num_found += rc;
}
}
if (hints->ai_socktype == 0 || hints->ai_socktype == SOCK_DGRAM)
{
servent* sptr = getservbyname(serv, "udp");
if (sptr != 0)
{
int rc = gai_port(aihead, sptr->s_port, SOCK_DGRAM);
if (rc < 0)
return EAI_MEMORY;
num_found += rc;
}
}
}
if (num_found == 0)
{
if (hints->ai_socktype == 0)
{
// All calls to getservbyname() failed.
return EAI_NONAME;
}
else
{
// Service not supported for socket type.
return EAI_SERVICE;
}
}
return 0;
}
inline int gai_echeck(const char* host, const char* service,
int flags, int family, int socktype, int protocol)
{
(void)(flags);
(void)(protocol);
// Host or service must be specified.
if (host == 0 || host[0] == '\0')
if (service == 0 || service[0] == '\0')
return EAI_NONAME;
// Check combination of family and socket type.
switch (family)
{
case AF_UNSPEC:
break;
case AF_INET:
case AF_INET6:
if (socktype != 0 && socktype != SOCK_STREAM && socktype != SOCK_DGRAM)
return EAI_SOCKTYPE;
break;
default:
return EAI_FAMILY;
}
return 0;
}
inline void freeaddrinfo_emulation(addrinfo_type* aihead)
{
addrinfo_type* ai = aihead;
while (ai)
{
gai_free(ai->ai_addr);
gai_free(ai->ai_canonname);
addrinfo_type* ainext = ai->ai_next;
gai_free(ai);
ai = ainext;
}
}
inline int getaddrinfo_emulation(const char* host, const char* service,
const addrinfo_type* hintsp, addrinfo_type** result)
{
// Set up linked list of addrinfo structures.
addrinfo_type* aihead = 0;
addrinfo_type** ainext = &aihead;
char* canon = 0;
// Supply default hints if not specified by caller.
addrinfo_type hints = addrinfo_type();
hints.ai_family = AF_UNSPEC;
if (hintsp)
hints = *hintsp;
// If the resolution is not specifically for AF_INET6, remove the AI_V4MAPPED
// and AI_ALL flags.
#if defined(AI_V4MAPPED)
if (hints.ai_family != AF_INET6)
hints.ai_flags &= ~AI_V4MAPPED;
#endif
#if defined(AI_ALL)
if (hints.ai_family != AF_INET6)
hints.ai_flags &= ~AI_ALL;
#endif
// Basic error checking.
int rc = gai_echeck(host, service, hints.ai_flags, hints.ai_family,
hints.ai_socktype, hints.ai_protocol);
if (rc != 0)
{
freeaddrinfo_emulation(aihead);
return rc;
}
gai_search search[2];
int search_count = gai_nsearch(host, &hints, search);
for (gai_search* sptr = search; sptr < search + search_count; ++sptr)
{
// Check for IPv4 dotted decimal string.
in4_addr_type inaddr;
if (socket_ops::inet_pton(AF_INET, sptr->host, &inaddr) == 1)
{
if (hints.ai_family != AF_UNSPEC && hints.ai_family != AF_INET)
{
freeaddrinfo_emulation(aihead);
gai_free(canon);
return EAI_FAMILY;
}
if (sptr->family == AF_INET)
{
rc = gai_aistruct(&ainext, &hints, &inaddr, AF_INET);
if (rc != 0)
{
freeaddrinfo_emulation(aihead);
gai_free(canon);
return rc;
}
}
continue;
}
// Check for IPv6 hex string.
in6_addr_type in6addr;
if (socket_ops::inet_pton(AF_INET6, sptr->host, &in6addr) == 1)
{
if (hints.ai_family != AF_UNSPEC && hints.ai_family != AF_INET6)
{
freeaddrinfo_emulation(aihead);
gai_free(canon);
return EAI_FAMILY;
}
if (sptr->family == AF_INET6)
{
rc = gai_aistruct(&ainext, &hints, &in6addr, AF_INET6);
if (rc != 0)
{
freeaddrinfo_emulation(aihead);
gai_free(canon);
return rc;
}
}
continue;
}
// Look up hostname.
hostent hent;
char hbuf[8192] = "";
int herr = 0;
hostent* hptr = socket_ops::gethostbyname(sptr->host,
sptr->family, &hent, hbuf, sizeof(hbuf), &herr, hints.ai_flags);
if (hptr == 0)
{
if (search_count == 2)
{
// Failure is OK if there are multiple searches.
continue;
}
freeaddrinfo_emulation(aihead);
gai_free(canon);
switch (herr)
{
case HOST_NOT_FOUND:
return EAI_NONAME;
case TRY_AGAIN:
return EAI_AGAIN;
case NO_RECOVERY:
return EAI_FAIL;
case NO_DATA:
default:
return EAI_NONAME;
}
}
// Check for address family mismatch if one was specified.
if (hints.ai_family != AF_UNSPEC && hints.ai_family != hptr->h_addrtype)
{
freeaddrinfo_emulation(aihead);
gai_free(canon);
socket_ops::freehostent(hptr);
return EAI_FAMILY;
}
// Save canonical name first time.
if (host != 0 && host[0] != '\0' && hptr->h_name && hptr->h_name[0]
&& (hints.ai_flags & AI_CANONNAME) && canon == 0)
{
canon = gai_alloc<char>(strlen(hptr->h_name) + 1);
if (canon == 0)
{
freeaddrinfo_emulation(aihead);
socket_ops::freehostent(hptr);
return EAI_MEMORY;
}
strcpy(canon, hptr->h_name);
}
// Create an addrinfo structure for each returned address.
for (char** ap = hptr->h_addr_list; *ap; ++ap)
{
rc = gai_aistruct(&ainext, &hints, *ap, hptr->h_addrtype);
if (rc != 0)
{
freeaddrinfo_emulation(aihead);
gai_free(canon);
socket_ops::freehostent(hptr);
return EAI_FAMILY;
}
}
socket_ops::freehostent(hptr);
}
// Check if we found anything.
if (aihead == 0)
{
gai_free(canon);
return EAI_NONAME;
}
// Return canonical name in first entry.
if (host != 0 && host[0] != '\0' && (hints.ai_flags & AI_CANONNAME))
{
if (canon)
{
aihead->ai_canonname = canon;
canon = 0;
}
else
{
aihead->ai_canonname = gai_alloc<char>(strlen(search[0].host) + 1);
if (aihead->ai_canonname == 0)
{
freeaddrinfo_emulation(aihead);
return EAI_MEMORY;
}
strcpy(aihead->ai_canonname, search[0].host);
}
}
gai_free(canon);
// Process the service name.
if (service != 0 && service[0] != '\0')
{
rc = gai_serv(aihead, &hints, service);
if (rc != 0)
{
freeaddrinfo_emulation(aihead);
return rc;
}
}
// Return result to caller.
*result = aihead;
return 0;
}
inline int getnameinfo_emulation(const socket_addr_type* sa,
socket_addr_len_type salen, char* host, std::size_t hostlen,
char* serv, std::size_t servlen, int flags)
{
using namespace std;
const char* addr;
size_t addr_len;
unsigned short port;
switch (sa->sa_family)
{
case AF_INET:
if (salen != sizeof(sockaddr_in4_type))
{
set_error(asio::error::invalid_argument);
return 1;
}
addr = reinterpret_cast<const char*>(
&reinterpret_cast<const sockaddr_in4_type*>(sa)->sin_addr);
addr_len = sizeof(in4_addr_type);
port = reinterpret_cast<const sockaddr_in4_type*>(sa)->sin_port;
break;
case AF_INET6:
if (salen != sizeof(sockaddr_in6_type))
{
set_error(asio::error::invalid_argument);
return 1;
}
addr = reinterpret_cast<const char*>(
&reinterpret_cast<const sockaddr_in6_type*>(sa)->sin6_addr);
addr_len = sizeof(in6_addr_type);
port = reinterpret_cast<const sockaddr_in6_type*>(sa)->sin6_port;
break;
default:
set_error(asio::error::address_family_not_supported);
return 1;
}
if (host && hostlen > 0)
{
if (flags & NI_NUMERICHOST)
{
if (socket_ops::inet_ntop(sa->sa_family, addr, host, hostlen) == 0)
{
return 1;
}
}
else
{
hostent hent;
char hbuf[8192] = "";
int herr = 0;
hostent* hptr = socket_ops::gethostbyaddr(addr,
static_cast<int>(addr_len), sa->sa_family,
&hent, hbuf, sizeof(hbuf), &herr);
if (hptr && hptr->h_name && hptr->h_name[0] != '\0')
{
if (flags & NI_NOFQDN)
{
char* dot = strchr(hptr->h_name, '.');
if (dot)
{
*dot = 0;
}
}
*host = '\0';
strncat(host, hptr->h_name, hostlen);
socket_ops::freehostent(hptr);
}
else
{
socket_ops::freehostent(hptr);
if (flags & NI_NAMEREQD)
{
set_error(asio::error::host_not_found);
return 1;
}
if (socket_ops::inet_ntop(sa->sa_family, addr, host, hostlen) == 0)
{
return 1;
}
}
}
}
if (serv && servlen > 0)
{
if (flags & NI_NUMERICSERV)
{
if (servlen < 6)
{
set_error(asio::error::no_buffer_space);
return 1;
}
sprintf(serv, "%u", ntohs(port));
}
else
{
#if defined(BOOST_HAS_THREADS) && defined(BOOST_HAS_PTHREADS)
static ::pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
::pthread_mutex_lock(&mutex);
#endif // defined(BOOST_HAS_THREADS) && defined(BOOST_HAS_PTHREADS)
servent* sptr = ::getservbyport(port, (flags & NI_DGRAM) ? "udp" : 0);
if (sptr && sptr->s_name && sptr->s_name[0] != '\0')
{
*serv = '\0';
strncat(serv, sptr->s_name, servlen);
}
else
{
if (servlen < 6)
{
set_error(asio::error::no_buffer_space);
return 1;
}
sprintf(serv, "%u", ntohs(port));
}
#if defined(BOOST_HAS_THREADS) && defined(BOOST_HAS_PTHREADS)
::pthread_mutex_unlock(&mutex);
#endif // defined(BOOST_HAS_THREADS) && defined(BOOST_HAS_PTHREADS)
}
}
set_error(0);
return 0;
}
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
// || defined(__MACH__) && defined(__APPLE__)
inline int translate_addrinfo_error(int error)
{
switch (error)
{
case 0:
return asio::error::success;
case EAI_AGAIN:
return asio::error::host_not_found_try_again;
case EAI_BADFLAGS:
return asio::error::invalid_argument;
case EAI_FAIL:
return asio::error::no_recovery;
case EAI_FAMILY:
return asio::error::address_family_not_supported;
case EAI_MEMORY:
return asio::error::no_memory;
case EAI_NONAME:
return asio::error::host_not_found;
case EAI_SERVICE:
return asio::error::service_not_found;
case EAI_SOCKTYPE:
return asio::error::socket_type_not_supported;
default: // Possibly the non-portable EAI_SYSTEM.
return get_error();
}
}
inline int getaddrinfo(const char* host, const char* service,
const addrinfo_type* hints, addrinfo_type** result)
{
set_error(0);
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
# if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0501)
// Building for Windows XP, Windows Server 2003, or later.
int error = ::getaddrinfo(host, service, hints, result);
return translate_addrinfo_error(error);
# else
// Building for Windows 2000 or earlier.
typedef int (WSAAPI *gai_t)(const char*,
const char*, const addrinfo_type*, addrinfo_type**);
if (HMODULE winsock_module = ::GetModuleHandleA("ws2_32"))
{
if (gai_t gai = (gai_t)::GetProcAddress(winsock_module, "getaddrinfo"))
{
int error = gai(host, service, hints, result);
return translate_addrinfo_error(error);
}
}
int error = getaddrinfo_emulation(host, service, hints, result);
return translate_addrinfo_error(error);
# endif
#elif defined(__MACH__) && defined(__APPLE__)
int error = getaddrinfo_emulation(host, service, hints, result);
return translate_addrinfo_error(error);
#else
int error = ::getaddrinfo(host, service, hints, result);
return translate_addrinfo_error(error);
#endif
}
inline void freeaddrinfo(addrinfo_type* ai)
{
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
# if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0501)
// Building for Windows XP, Windows Server 2003, or later.
::freeaddrinfo(ai);
# else
// Building for Windows 2000 or earlier.
typedef int (WSAAPI *fai_t)(addrinfo_type*);
if (HMODULE winsock_module = ::GetModuleHandleA("ws2_32"))
{
if (fai_t fai = (fai_t)::GetProcAddress(winsock_module, "freeaddrinfo"))
{
fai(ai);
return;
}
}
freeaddrinfo_emulation(ai);
# endif
#elif defined(__MACH__) && defined(__APPLE__)
freeaddrinfo_emulation(ai);
#else
::freeaddrinfo(ai);
#endif
}
inline int getnameinfo(const socket_addr_type* addr,
socket_addr_len_type addrlen, char* host, std::size_t hostlen,
char* serv, std::size_t servlen, int flags)
{
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
# if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0501)
// Building for Windows XP, Windows Server 2003, or later.
set_error(0);
int error = ::getnameinfo(addr, addrlen, host, hostlen, serv, servlen, flags);
return translate_addrinfo_error(error);
# else
// Building for Windows 2000 or earlier.
typedef int (WSAAPI *gni_t)(const socket_addr_type*,
socket_addr_len_type, char*, std::size_t, char*, std::size_t, int);
if (HMODULE winsock_module = ::GetModuleHandleA("ws2_32"))
{
if (gni_t gni = (gni_t)::GetProcAddress(winsock_module, "getnameinfo"))
{
set_error(0);
int error = gni(addr, addrlen, host, hostlen, serv, servlen, flags);
return translate_addrinfo_error(error);
}
}
set_error(0);
int error = getnameinfo_emulation(addr, addrlen,
host, hostlen, serv, servlen, flags);
return translate_addrinfo_error(error);
# endif
#elif defined(__MACH__) && defined(__APPLE__)
using namespace std; // For memcpy.
sockaddr_storage_type tmp_addr;
memcpy(&tmp_addr, addr, addrlen);
tmp_addr.ss_len = addrlen;
addr = reinterpret_cast<socket_addr_type*>(&tmp_addr);
set_error(0);
int error = getnameinfo_emulation(addr, addrlen,
host, hostlen, serv, servlen, flags);
return translate_addrinfo_error(error);
#else
set_error(0);
int error = ::getnameinfo(addr, addrlen, host, hostlen, serv, servlen, flags);
return translate_addrinfo_error(error);
#endif
}
inline u_long_type network_to_host_long(u_long_type value)
{
return ntohl(value);
}
inline u_long_type host_to_network_long(u_long_type value)
{
return htonl(value);
}
inline u_short_type network_to_host_short(u_short_type value)
{
return ntohs(value);
}
inline u_short_type host_to_network_short(u_short_type value)
{
return htons(value);
}
} // namespace socket_ops
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_SOCKET_OPS_HPP
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