1/* $NetBSD: getaddrinfo.c,v 1.82 2006/03/25 12:09:40 rpaulo Exp $ */
2/* $KAME: getaddrinfo.c,v 1.29 2000/08/31 17:26:57 itojun Exp $ */
3/*
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 */
32
33/*
34 * This is an adaptation of Android's implementation of RFC 6724
35 * (in Android's getaddrinfo.c). It has some cosmetic differences
36 * from Android's getaddrinfo.c, but Android's getaddrinfo.c was
37 * used as a guide or example of a way to implement the RFC 6724 spec when
38 * this was written.
39 */
40
41#include "address_sorting_internal.h"
42
43#if defined(ADDRESS_SORTING_POSIX)
44
45#include <errno.h>
46#include <inttypes.h>
47#include <limits.h>
48#include <stdlib.h>
49#include <string.h>
50#include <sys/types.h>
51#include <unistd.h>
52
53static bool posix_source_addr_factory_get_source_addr(
54 address_sorting_source_addr_factory* factory,
55 const address_sorting_address* dest_addr,
56 address_sorting_address* source_addr) {
57 bool source_addr_exists = false;
58 // Android sets SOCK_CLOEXEC. Don't set this here for portability.
59 int s = socket(((struct sockaddr*)dest_addr)->sa_family, SOCK_DGRAM, 0);
60 if (s != -1) {
61 if (connect(s, (const struct sockaddr*)&dest_addr->addr,
62 (socklen_t)dest_addr->len) != -1) {
63 address_sorting_address found_source_addr;
64 memset(&found_source_addr, 0, sizeof(found_source_addr));
65 found_source_addr.len = sizeof(found_source_addr.addr);
66 if (getsockname(s, (struct sockaddr*)&found_source_addr.addr,
67 (socklen_t*)&found_source_addr.len) != -1) {
68 source_addr_exists = true;
69 *source_addr = found_source_addr;
70 }
71 }
72 }
73 close(s);
74 return source_addr_exists;
75}
76
77static void posix_source_addr_factory_destroy(
78 address_sorting_source_addr_factory* self) {
79 free(self);
80}
81
82static const address_sorting_source_addr_factory_vtable
83 posix_source_addr_factory_vtable = {
84 posix_source_addr_factory_get_source_addr,
85 posix_source_addr_factory_destroy,
86};
87
88address_sorting_source_addr_factory*
89address_sorting_create_source_addr_factory_for_current_platform() {
90 address_sorting_source_addr_factory* factory =
91 malloc(sizeof(address_sorting_source_addr_factory));
92 memset(factory, 0, sizeof(address_sorting_source_addr_factory));
93 factory->vtable = &posix_source_addr_factory_vtable;
94 return factory;
95}
96
97#endif // defined(ADDRESS_SORTING_POSIX)
98