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 | |
53 | int 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 | |