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 <cutils/sockets.h>
18
19 #include <stdlib.h>
20 #include <string.h>
21 #include <unistd.h>
22 #include <errno.h>
23 #include <stddef.h>
24
25 #ifdef HAVE_WINSOCK
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 /* !HAVE_WINSOCK */
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.h"
41
42 #define LISTEN_BACKLOG 4
43
44 /* Documented in header file. */
socket_make_sockaddr_un(const char * name,int namespaceId,struct sockaddr_un * p_addr,socklen_t * alen)45 int socket_make_sockaddr_un(const char *name, int namespaceId,
46 struct sockaddr_un *p_addr, socklen_t *alen)
47 {
48 memset (p_addr, 0, sizeof (*p_addr));
49 size_t namelen;
50
51 switch (namespaceId) {
52 case ANDROID_SOCKET_NAMESPACE_ABSTRACT:
53 #ifdef HAVE_LINUX_LOCAL_SOCKET_NAMESPACE
54 namelen = strlen(name);
55
56 // Test with length +1 for the *initial* '\0'.
57 if ((namelen + 1) > sizeof(p_addr->sun_path)) {
58 goto error;
59 }
60
61 /*
62 * Note: The path in this case is *not* supposed to be
63 * '\0'-terminated. ("man 7 unix" for the gory details.)
64 */
65
66 p_addr->sun_path[0] = 0;
67 memcpy(p_addr->sun_path + 1, name, namelen);
68 #else /*HAVE_LINUX_LOCAL_SOCKET_NAMESPACE*/
69 /* this OS doesn't have the Linux abstract namespace */
70
71 namelen = strlen(name) + strlen(FILESYSTEM_SOCKET_PREFIX);
72 /* unix_path_max appears to be missing on linux */
73 if (namelen > sizeof(*p_addr)
74 - offsetof(struct sockaddr_un, sun_path) - 1) {
75 goto error;
76 }
77
78 strcpy(p_addr->sun_path, FILESYSTEM_SOCKET_PREFIX);
79 strcat(p_addr->sun_path, name);
80 #endif /*HAVE_LINUX_LOCAL_SOCKET_NAMESPACE*/
81 break;
82
83 case ANDROID_SOCKET_NAMESPACE_RESERVED:
84 namelen = strlen(name) + strlen(ANDROID_RESERVED_SOCKET_PREFIX);
85 /* unix_path_max appears to be missing on linux */
86 if (namelen > sizeof(*p_addr)
87 - offsetof(struct sockaddr_un, sun_path) - 1) {
88 goto error;
89 }
90
91 strcpy(p_addr->sun_path, ANDROID_RESERVED_SOCKET_PREFIX);
92 strcat(p_addr->sun_path, name);
93 break;
94
95 case ANDROID_SOCKET_NAMESPACE_FILESYSTEM:
96 namelen = strlen(name);
97 /* unix_path_max appears to be missing on linux */
98 if (namelen > sizeof(*p_addr)
99 - offsetof(struct sockaddr_un, sun_path) - 1) {
100 goto error;
101 }
102
103 strcpy(p_addr->sun_path, name);
104 break;
105 default:
106 // invalid namespace id
107 return -1;
108 }
109
110 p_addr->sun_family = AF_LOCAL;
111 *alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1;
112 return 0;
113 error:
114 return -1;
115 }
116
117 /**
118 * connect to peer named "name" on fd
119 * returns same fd or -1 on error.
120 * fd is not closed on error. that's your job.
121 *
122 * Used by AndroidSocketImpl
123 */
socket_local_client_connect(int fd,const char * name,int namespaceId,int type)124 int socket_local_client_connect(int fd, const char *name, int namespaceId,
125 int type)
126 {
127 struct sockaddr_un addr;
128 socklen_t alen;
129 size_t namelen;
130 int err;
131
132 err = socket_make_sockaddr_un(name, namespaceId, &addr, &alen);
133
134 if (err < 0) {
135 goto error;
136 }
137
138 if(connect(fd, (struct sockaddr *) &addr, alen) < 0) {
139 goto error;
140 }
141
142 return fd;
143
144 error:
145 return -1;
146 }
147
148 /**
149 * connect to peer named "name"
150 * returns fd or -1 on error
151 */
socket_local_client(const char * name,int namespaceId,int type)152 int socket_local_client(const char *name, int namespaceId, int type)
153 {
154 int s;
155
156 s = socket(AF_LOCAL, type, 0);
157 if(s < 0) return -1;
158
159 if ( 0 > socket_local_client_connect(s, name, namespaceId, type)) {
160 close(s);
161 return -1;
162 }
163
164 return s;
165 }
166
167 #endif /* !HAVE_WINSOCK */
168