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 #ifdef HAVE_ARPA_INET_H
44 #include <arpa/inet.h>
45 #endif
46 #ifndef INADDR_LOOPBACK
47 #define INADDR_LOOPBACK 0x7f000001
48 #endif /* !INADDR_LOOPBACK */
49 #endif /* !WIN32 */
50
51 /* The last 3 #include files should be in this order */
52 #include "curl_printf.h"
53 #include "curl_memory.h"
54 #include "memdebug.h"
55
Curl_socketpair(int domain,int type,int protocol,curl_socket_t socks[2])56 int Curl_socketpair(int domain, int type, int protocol,
57 curl_socket_t socks[2])
58 {
59 union {
60 struct sockaddr_in inaddr;
61 struct sockaddr addr;
62 } a;
63 curl_socket_t listener;
64 curl_socklen_t addrlen = sizeof(a.inaddr);
65 int reuse = 1;
66 char data[2][12];
67 ssize_t dlen;
68 (void)domain;
69 (void)type;
70 (void)protocol;
71
72 listener = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
73 if(listener == CURL_SOCKET_BAD)
74 return -1;
75
76 memset(&a, 0, sizeof(a));
77 a.inaddr.sin_family = AF_INET;
78 a.inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
79 a.inaddr.sin_port = 0;
80
81 socks[0] = socks[1] = CURL_SOCKET_BAD;
82
83 if(setsockopt(listener, SOL_SOCKET, SO_REUSEADDR,
84 (char *)&reuse, (curl_socklen_t)sizeof(reuse)) == -1)
85 goto error;
86 if(bind(listener, &a.addr, sizeof(a.inaddr)) == -1)
87 goto error;
88 if(getsockname(listener, &a.addr, &addrlen) == -1)
89 goto error;
90 if(listen(listener, 1) == -1)
91 goto error;
92 socks[0] = socket(AF_INET, SOCK_STREAM, 0);
93 if(socks[0] == CURL_SOCKET_BAD)
94 goto error;
95 if(connect(socks[0], &a.addr, sizeof(a.inaddr)) == -1)
96 goto error;
97 socks[1] = accept(listener, NULL, NULL);
98 if(socks[1] == CURL_SOCKET_BAD)
99 goto error;
100
101 /* verify that nothing else connected */
102 msnprintf(data[0], sizeof(data[0]), "%p", socks);
103 dlen = strlen(data[0]);
104 if(swrite(socks[0], data[0], dlen) != dlen)
105 goto error;
106 if(sread(socks[1], data[1], sizeof(data[1])) != dlen)
107 goto error;
108 if(memcmp(data[0], data[1], dlen))
109 goto error;
110
111 sclose(listener);
112 return 0;
113
114 error:
115 sclose(listener);
116 sclose(socks[0]);
117 sclose(socks[1]);
118 return -1;
119 }
120
121 #endif /* ! HAVE_SOCKETPAIR */
122