1 /*
2 * Copyright (C) 2006 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <errno.h>
18 #include <stddef.h>
19 #include <stdlib.h>
20 #include <string.h>
21 #include <unistd.h>
22
23 #include <cutils/sockets.h>
24
25 #if defined(_WIN32)
26
socket_local_client(const char * name,int namespaceId,int type)27 int socket_local_client(const char *name, int namespaceId, int type)
28 {
29 errno = ENOSYS;
30 return -1;
31 }
32
33 #else /* !_WIN32 */
34
35 #include <sys/socket.h>
36 #include <sys/un.h>
37 #include <sys/select.h>
38 #include <sys/types.h>
39
40 #include "socket_local_unix.h"
41
42 #define UNUSED __attribute__((unused))
43
44 #define LISTEN_BACKLOG 4
45
46 /* Documented in header file. */
socket_make_sockaddr_un(const char * name,int namespaceId,struct sockaddr_un * p_addr,socklen_t * alen)47 int socket_make_sockaddr_un(const char *name, int namespaceId,
48 struct sockaddr_un *p_addr, socklen_t *alen)
49 {
50 memset (p_addr, 0, sizeof (*p_addr));
51 size_t namelen;
52
53 switch (namespaceId) {
54 case ANDROID_SOCKET_NAMESPACE_ABSTRACT:
55 #if defined(__linux__)
56 namelen = strlen(name);
57
58 // Test with length +1 for the *initial* '\0'.
59 if ((namelen + 1) > sizeof(p_addr->sun_path)) {
60 goto error;
61 }
62
63 /*
64 * Note: The path in this case is *not* supposed to be
65 * '\0'-terminated. ("man 7 unix" for the gory details.)
66 */
67
68 p_addr->sun_path[0] = 0;
69 memcpy(p_addr->sun_path + 1, name, namelen);
70 #else
71 /* this OS doesn't have the Linux abstract namespace */
72
73 namelen = strlen(name) + strlen(FILESYSTEM_SOCKET_PREFIX);
74 /* unix_path_max appears to be missing on linux */
75 if (namelen > sizeof(*p_addr)
76 - offsetof(struct sockaddr_un, sun_path) - 1) {
77 goto error;
78 }
79
80 strcpy(p_addr->sun_path, FILESYSTEM_SOCKET_PREFIX);
81 strcat(p_addr->sun_path, name);
82 #endif
83 break;
84
85 case ANDROID_SOCKET_NAMESPACE_RESERVED:
86 namelen = strlen(name) + strlen(ANDROID_RESERVED_SOCKET_PREFIX);
87 /* unix_path_max appears to be missing on linux */
88 if (namelen > sizeof(*p_addr)
89 - offsetof(struct sockaddr_un, sun_path) - 1) {
90 goto error;
91 }
92
93 strcpy(p_addr->sun_path, ANDROID_RESERVED_SOCKET_PREFIX);
94 strcat(p_addr->sun_path, name);
95 break;
96
97 case ANDROID_SOCKET_NAMESPACE_FILESYSTEM:
98 namelen = strlen(name);
99 /* unix_path_max appears to be missing on linux */
100 if (namelen > sizeof(*p_addr)
101 - offsetof(struct sockaddr_un, sun_path) - 1) {
102 goto error;
103 }
104
105 strcpy(p_addr->sun_path, name);
106 break;
107 default:
108 // invalid namespace id
109 return -1;
110 }
111
112 p_addr->sun_family = AF_LOCAL;
113 *alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1;
114 return 0;
115 error:
116 return -1;
117 }
118
119 /**
120 * connect to peer named "name" on fd
121 * returns same fd or -1 on error.
122 * fd is not closed on error. that's your job.
123 *
124 * Used by AndroidSocketImpl
125 */
socket_local_client_connect(int fd,const char * name,int namespaceId,int type UNUSED)126 int socket_local_client_connect(int fd, const char *name, int namespaceId,
127 int type UNUSED)
128 {
129 struct sockaddr_un addr;
130 socklen_t alen;
131 int err;
132
133 err = socket_make_sockaddr_un(name, namespaceId, &addr, &alen);
134
135 if (err < 0) {
136 goto error;
137 }
138
139 if(connect(fd, (struct sockaddr *) &addr, alen) < 0) {
140 goto error;
141 }
142
143 return fd;
144
145 error:
146 return -1;
147 }
148
149 /**
150 * connect to peer named "name"
151 * returns fd or -1 on error
152 */
socket_local_client(const char * name,int namespaceId,int type)153 int socket_local_client(const char *name, int namespaceId, int type)
154 {
155 int s;
156
157 s = socket(AF_LOCAL, type, 0);
158 if(s < 0) return -1;
159
160 if ( 0 > socket_local_client_connect(s, name, namespaceId, type)) {
161 close(s);
162 return -1;
163 }
164
165 return s;
166 }
167
168 #endif /* !_WIN32 */
169