1/***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22
23#include "curl_setup.h"
24#include "socketpair.h"
25
26#ifndef HAVE_SOCKETPAIR
27#ifdef WIN32
28/*
29 * This is a socketpair() implementation for Windows.
30 */
31#include <string.h>
32#include <winsock2.h>
33#include <ws2tcpip.h>
34#include <windows.h>
35#include <io.h>
36#else
37#ifdef HAVE_NETDB_H
38#include <netdb.h>
39#endif
40#ifdef HAVE_NETINET_IN_H
41#include <netinet/in.h> /* IPPROTO_TCP */
42#endif
43#ifndef INADDR_LOOPBACK
44#define INADDR_LOOPBACK 0x7f000001
45#endif /* !INADDR_LOOPBACK */
46#endif /* !WIN32 */
47
48/* The last 3 #include files should be in this order */
49#include "curl_printf.h"
50#include "curl_memory.h"
51#include "memdebug.h"
52
53int Curl_socketpair(int domain, int type, int protocol,
54 curl_socket_t socks[2])
55{
56 union {
57 struct sockaddr_in inaddr;
58 struct sockaddr addr;
59 } a;
60 curl_socket_t listener;
61 curl_socklen_t addrlen = sizeof(a.inaddr);
62 int reuse = 1;
63 char data[2][12];
64 ssize_t dlen;
65 (void)domain;
66 (void)type;
67 (void)protocol;
68
69 listener = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
70 if(listener == CURL_SOCKET_BAD)
71 return -1;
72
73 memset(&a, 0, sizeof(a));
74 a.inaddr.sin_family = AF_INET;
75 a.inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
76 a.inaddr.sin_port = 0;
77
78 socks[0] = socks[1] = CURL_SOCKET_BAD;
79
80 if(setsockopt(listener, SOL_SOCKET, SO_REUSEADDR,
81 (char *)&reuse, (curl_socklen_t)sizeof(reuse)) == -1)
82 goto error;
83 if(bind(listener, &a.addr, sizeof(a.inaddr)) == -1)
84 goto error;
85 if(getsockname(listener, &a.addr, &addrlen) == -1)
86 goto error;
87 if(listen(listener, 1) == -1)
88 goto error;
89 socks[0] = socket(AF_INET, SOCK_STREAM, 0);
90 if(socks[0] == CURL_SOCKET_BAD)
91 goto error;
92 if(connect(socks[0], &a.addr, sizeof(a.inaddr)) == -1)
93 goto error;
94 socks[1] = accept(listener, NULL, NULL);
95 if(socks[1] == CURL_SOCKET_BAD)
96 goto error;
97
98 /* verify that nothing else connected */
99 msnprintf(data[0], sizeof(data[0]), "%p", socks);
100 dlen = strlen(data[0]);
101 if(swrite(socks[0], data[0], dlen) != dlen)
102 goto error;
103 if(sread(socks[1], data[1], sizeof(data[1])) != dlen)
104 goto error;
105 if(memcmp(data[0], data[1], dlen))
106 goto error;
107
108 sclose(listener);
109 return 0;
110
111 error:
112 sclose(listener);
113 sclose(socks[0]);
114 sclose(socks[1]);
115 return -1;
116}
117
118#endif /* ! HAVE_SOCKETPAIR */
119