138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 2019 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "curl_setup.h"
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#include "socketpair.h"
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#if !defined(HAVE_SOCKETPAIR) && !defined(CURL_DISABLE_SOCKETPAIR)
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#ifdef WIN32
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/*
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* This is a socketpair() implementation for Windows.
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*/
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#include <string.h>
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#include <windows.h>
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#include <io.h>
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#else
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h> /* IPPROTO_TCP */
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#ifndef INADDR_LOOPBACK
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#define INADDR_LOOPBACK 0x7f000001
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#endif /* !INADDR_LOOPBACK */
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#endif /* !WIN32 */
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#include "nonblock.h" /* for curlx_nonblock */
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#include "timeval.h" /* needed before select.h */
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#include "select.h" /* for Curl_poll */
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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int Curl_socketpair(int domain, int type, int protocol,
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curl_socket_t socks[2])
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{
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union {
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struct sockaddr_in inaddr;
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struct sockaddr addr;
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} a, a2;
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curl_socket_t listener;
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curl_socklen_t addrlen = sizeof(a.inaddr);
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int reuse = 1;
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struct pollfd pfd[1];
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(void)domain;
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(void)type;
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(void)protocol;
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listener = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if(listener == CURL_SOCKET_BAD)
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return -1;
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memset(&a, 0, sizeof(a));
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a.inaddr.sin_family = AF_INET;
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a.inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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a.inaddr.sin_port = 0;
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socks[0] = socks[1] = CURL_SOCKET_BAD;
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if(setsockopt(listener, SOL_SOCKET, SO_REUSEADDR,
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(char *)&reuse, (curl_socklen_t)sizeof(reuse)) == -1)
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goto error;
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if(bind(listener, &a.addr, sizeof(a.inaddr)) == -1)
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goto error;
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if(getsockname(listener, &a.addr, &addrlen) == -1 ||
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addrlen < (int)sizeof(a.inaddr))
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goto error;
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if(listen(listener, 1) == -1)
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goto error;
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socks[0] = socket(AF_INET, SOCK_STREAM, 0);
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if(socks[0] == CURL_SOCKET_BAD)
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goto error;
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if(connect(socks[0], &a.addr, sizeof(a.inaddr)) == -1)
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goto error;
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/* use non-blocking accept to make sure we don't block forever */
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if(curlx_nonblock(listener, TRUE) < 0)
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goto error;
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pfd[0].fd = listener;
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pfd[0].events = POLLIN;
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pfd[0].revents = 0;
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(void)Curl_poll(pfd, 1, 10*1000); /* 10 seconds */
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socks[1] = accept(listener, NULL, NULL);
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if(socks[1] == CURL_SOCKET_BAD)
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goto error;
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/* verify that nothing else connected */
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addrlen = sizeof(a.inaddr);
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if(getsockname(socks[0], &a.addr, &addrlen) == -1 ||
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addrlen < (int)sizeof(a.inaddr))
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goto error;
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addrlen = sizeof(a2.inaddr);
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if(getpeername(socks[1], &a2.addr, &addrlen) == -1 ||
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addrlen < (int)sizeof(a2.inaddr))
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goto error;
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if(a.inaddr.sin_family != a2.inaddr.sin_family ||
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a.inaddr.sin_addr.s_addr != a2.inaddr.sin_addr.s_addr ||
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a.inaddr.sin_port != a2.inaddr.sin_port)
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goto error;
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sclose(listener);
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return 0;
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error:
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sclose(listener);
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sclose(socks[0]);
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sclose(socks[1]);
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return -1;
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}
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#endif /* ! HAVE_SOCKETPAIR */
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