1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <netinet/in.h>
30
31 #include <errno.h>
32 #include <netdb.h>
33 #include <sys/types.h>
34 #include <sys/socket.h>
35 #include <string.h>
36 #include <unistd.h>
37
38 constexpr int START_PORT = 600;
39 constexpr int END_PORT = IPPORT_RESERVED;
40 constexpr int NUM_PORTS = (END_PORT - START_PORT);
41
bindresvport(int sd,struct sockaddr_in * sin)42 int bindresvport(int sd, struct sockaddr_in* sin) {
43 sockaddr_in sin0;
44 if (sin == nullptr) {
45 memset(&sin0, 0, sizeof(sin0));
46 sin = &sin0;
47 sin->sin_family = AF_INET;
48 }
49
50 if (sin->sin_family != AF_INET) {
51 errno = EPFNOSUPPORT;
52 return -1;
53 }
54
55 // TODO: thread safety!
56 static short port;
57 if (port == 0) {
58 port = START_PORT + (getpid() % NUM_PORTS);
59 }
60
61 for (size_t i = NUM_PORTS; i > 0; i--, port++) {
62 if (port == END_PORT) port = START_PORT;
63 sin->sin_port = htons(port);
64 int rc = TEMP_FAILURE_RETRY(bind(sd, reinterpret_cast<sockaddr*>(sin), sizeof(*sin)));
65 if (rc >= 0) return rc;
66 }
67 return -1;
68 }
69
70 const in6_addr in6addr_any = IN6ADDR_ANY_INIT;
71 const in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
72