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 | |
53 | static 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 | |
77 | static void posix_source_addr_factory_destroy( |
78 | address_sorting_source_addr_factory* self) { |
79 | free(self); |
80 | } |
81 | |
82 | static 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 | |
88 | address_sorting_source_addr_factory* |
89 | address_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 | |