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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#include "socketpair.h"
#ifndef HAVE_SOCKETPAIR
#ifdef WIN32
/*
* This is a socketpair() implementation for Windows.
*/
#include <string.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <windows.h>
#include <io.h>
#else
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h> /* IPPROTO_TCP */
#endif
#ifndef INADDR_LOOPBACK
#define INADDR_LOOPBACK 0x7f000001
#endif /* !INADDR_LOOPBACK */
#endif /* !WIN32 */
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
int Curl_socketpair(int domain, int type, int protocol,
curl_socket_t socks[2])
{
union {
struct sockaddr_in inaddr;
struct sockaddr addr;
} a;
curl_socket_t listener;
curl_socklen_t addrlen = sizeof(a.inaddr);
int reuse = 1;
char data[2][12];
ssize_t dlen;
(void)domain;
(void)type;
(void)protocol;
listener = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(listener == CURL_SOCKET_BAD)
return -1;
memset(&a, 0, sizeof(a));
a.inaddr.sin_family = AF_INET;
a.inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
a.inaddr.sin_port = 0;
socks[0] = socks[1] = CURL_SOCKET_BAD;
if(setsockopt(listener, SOL_SOCKET, SO_REUSEADDR,
(char *)&reuse, (curl_socklen_t)sizeof(reuse)) == -1)
goto error;
if(bind(listener, &a.addr, sizeof(a.inaddr)) == -1)
goto error;
if(getsockname(listener, &a.addr, &addrlen) == -1)
goto error;
if(listen(listener, 1) == -1)
goto error;
socks[0] = socket(AF_INET, SOCK_STREAM, 0);
if(socks[0] == CURL_SOCKET_BAD)
goto error;
if(connect(socks[0], &a.addr, sizeof(a.inaddr)) == -1)
goto error;
socks[1] = accept(listener, NULL, NULL);
if(socks[1] == CURL_SOCKET_BAD)
goto error;
/* verify that nothing else connected */
msnprintf(data[0], sizeof(data[0]), "%p", socks);
dlen = strlen(data[0]);
if(swrite(socks[0], data[0], dlen) != dlen)
goto error;
if(sread(socks[1], data[1], sizeof(data[1])) != dlen)
goto error;
if(memcmp(data[0], data[1], dlen))
goto error;
sclose(listener);
return 0;
error:
sclose(listener);
sclose(socks[0]);
sclose(socks[1]);
return -1;
}
#endif /* ! HAVE_SOCKETPAIR */
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