1 /* libs/cutils/socket_local_server.c
2 **
3 ** Copyright 2006, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 ** http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17
18 #include <cutils/sockets.h>
19
20 #include <stdlib.h>
21 #include <string.h>
22 #include <unistd.h>
23 #include <errno.h>
24 #include <stddef.h>
25
26 #ifdef HAVE_WINSOCK
27
socket_local_server(const char * name,int namespaceId,int type)28 int socket_local_server(const char *name, int namespaceId, int type)
29 {
30 errno = ENOSYS;
31 return -1;
32 }
33
34 #else /* !HAVE_WINSOCK */
35
36 #include <sys/socket.h>
37 #include <sys/un.h>
38 #include <sys/select.h>
39 #include <sys/types.h>
40 #include <netinet/in.h>
41
42 #include "socket_local.h"
43
44 #define LISTEN_BACKLOG 4
45
46 /* Only the bottom bits are really the socket type; there are flags too. */
47 #define SOCK_TYPE_MASK 0xf
48
49 /**
50 * Binds a pre-created socket(AF_LOCAL) 's' to 'name'
51 * returns 's' on success, -1 on fail
52 *
53 * Does not call listen()
54 */
socket_local_server_bind(int s,const char * name,int namespaceId)55 int socket_local_server_bind(int s, const char *name, int namespaceId)
56 {
57 struct sockaddr_un addr;
58 socklen_t alen;
59 int n;
60 int err;
61
62 err = socket_make_sockaddr_un(name, namespaceId, &addr, &alen);
63
64 if (err < 0) {
65 return -1;
66 }
67
68 /* basically: if this is a filesystem path, unlink first */
69 #if !defined(__linux__)
70 if (1) {
71 #else
72 if (namespaceId == ANDROID_SOCKET_NAMESPACE_RESERVED
73 || namespaceId == ANDROID_SOCKET_NAMESPACE_FILESYSTEM) {
74 #endif
75 /*ignore ENOENT*/
76 unlink(addr.sun_path);
77 }
78
79 n = 1;
80 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n));
81
82 if(bind(s, (struct sockaddr *) &addr, alen) < 0) {
83 return -1;
84 }
85
86 return s;
87
88 }
89
90
91 /** Open a server-side UNIX domain datagram socket in the Linux non-filesystem
92 * namespace
93 *
94 * Returns fd on success, -1 on fail
95 */
96
97 int socket_local_server(const char *name, int namespace, int type)
98 {
99 int err;
100 int s;
101
102 s = socket(AF_LOCAL, type, 0);
103 if (s < 0) return -1;
104
105 err = socket_local_server_bind(s, name, namespace);
106
107 if (err < 0) {
108 close(s);
109 return -1;
110 }
111
112 if ((type & SOCK_TYPE_MASK) == SOCK_STREAM) {
113 int ret;
114
115 ret = listen(s, LISTEN_BACKLOG);
116
117 if (ret < 0) {
118 close(s);
119 return -1;
120 }
121 }
122
123 return s;
124 }
125
126 #endif /* !HAVE_WINSOCK */
127