1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 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.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.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#include "socketpair.h"
#include "urldata.h"
#include "rand.h"
#if !defined(HAVE_SOCKETPAIR) && !defined(CURL_DISABLE_SOCKETPAIR)
#ifdef _WIN32
/*
* This is a socketpair() implementation for Windows.
*/
#include <string.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
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifndef INADDR_LOOPBACK
#define INADDR_LOOPBACK 0x7f000001
#endif /* !INADDR_LOOPBACK */
#endif /* !_WIN32 */
#include "nonblock.h" /* for curlx_nonblock */
#include "timeval.h" /* needed before select.h */
#include "select.h" /* for Curl_poll */
/* 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;
struct pollfd pfd[1];
(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 defined(_WIN32) || defined(__CYGWIN__)
/* don't set SO_REUSEADDR on Windows */
(void)reuse;
#ifdef SO_EXCLUSIVEADDRUSE
{
int exclusive = 1;
if(setsockopt(listener, SOL_SOCKET, SO_EXCLUSIVEADDRUSE,
(char *)&exclusive, (curl_socklen_t)sizeof(exclusive)) == -1)
goto error;
}
#endif
#else
if(setsockopt(listener, SOL_SOCKET, SO_REUSEADDR,
(char *)&reuse, (curl_socklen_t)sizeof(reuse)) == -1)
goto error;
#endif
if(bind(listener, &a.addr, sizeof(a.inaddr)) == -1)
goto error;
if(getsockname(listener, &a.addr, &addrlen) == -1 ||
addrlen < (int)sizeof(a.inaddr))
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;
/* use non-blocking accept to make sure we don't block forever */
if(curlx_nonblock(listener, TRUE) < 0)
goto error;
pfd[0].fd = listener;
pfd[0].events = POLLIN;
pfd[0].revents = 0;
(void)Curl_poll(pfd, 1, 1000); /* one second */
socks[1] = accept(listener, NULL, NULL);
if(socks[1] == CURL_SOCKET_BAD)
goto error;
else {
struct curltime start = Curl_now();
char rnd[9];
char check[sizeof(rnd)];
char *p = &check[0];
size_t s = sizeof(check);
if(Curl_rand(NULL, (unsigned char *)rnd, sizeof(rnd)))
goto error;
/* write data to the socket */
swrite(socks[0], rnd, sizeof(rnd));
/* verify that we read the correct data */
do {
ssize_t nread;
pfd[0].fd = socks[1];
pfd[0].events = POLLIN;
pfd[0].revents = 0;
(void)Curl_poll(pfd, 1, 1000); /* one second */
nread = sread(socks[1], p, s);
if(nread == -1) {
int sockerr = SOCKERRNO;
/* Don't block forever */
if(Curl_timediff(Curl_now(), start) > (60 * 1000))
goto error;
if(
#ifdef WSAEWOULDBLOCK
/* This is how Windows does it */
(WSAEWOULDBLOCK == sockerr)
#else
/* errno may be EWOULDBLOCK or on some systems EAGAIN when it
returned due to its inability to send off data without
blocking. We therefore treat both error codes the same here */
(EWOULDBLOCK == sockerr) || (EAGAIN == sockerr) ||
(EINTR == sockerr) || (EINPROGRESS == sockerr)
#endif
) {
continue;
}
goto error;
}
s -= nread;
if(s) {
p += nread;
continue;
}
if(memcmp(rnd, check, sizeof(check)))
goto error;
break;
} while(1);
}
sclose(listener);
return 0;
error:
sclose(listener);
sclose(socks[0]);
sclose(socks[1]);
return -1;
}
#endif /* ! HAVE_SOCKETPAIR */
|
