1 /*
2 * Copyright 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 <stddef.h>
18 #include <stdlib.h>
19 #include <string.h>
20 #include <sys/select.h>
21 #include <sys/socket.h>
22 #include <sys/types.h>
23 #include <sys/un.h>
24 #include <unistd.h>
25
26 #include "osi/include/osi.h"
27 #include "osi/include/socket_utils/socket_local.h"
28 #include "osi/include/socket_utils/sockets.h"
29
30 #define LISTEN_BACKLOG 4
31
32 /* Documented in header file. */
osi_socket_make_sockaddr_un(const char * name,int namespaceId,struct sockaddr_un * p_addr,socklen_t * alen)33 int osi_socket_make_sockaddr_un(const char* name, int namespaceId,
34 struct sockaddr_un* p_addr, socklen_t* alen) {
35 memset(p_addr, 0, sizeof(*p_addr));
36 size_t namelen;
37
38 switch (namespaceId) {
39 case ANDROID_SOCKET_NAMESPACE_ABSTRACT:
40 #if defined(__linux__)
41 namelen = strlen(name);
42
43 // Test with length +1 for the *initial* '\0'.
44 if ((namelen + 1) > sizeof(p_addr->sun_path)) {
45 goto error;
46 }
47
48 /*
49 * Note: The path in this case is *not* supposed to be
50 * '\0'-terminated. ("man 7 unix" for the gory details.)
51 */
52
53 p_addr->sun_path[0] = 0;
54 memcpy(p_addr->sun_path + 1, name, namelen);
55 #else
56 /* this OS doesn't have the Linux abstract namespace */
57
58 namelen = strlen(name) + strlen(FILESYSTEM_SOCKET_PREFIX);
59 /* unix_path_max appears to be missing on linux */
60 if (namelen >
61 sizeof(*p_addr) - offsetof(struct sockaddr_un, sun_path) - 1) {
62 goto error;
63 }
64
65 strcpy(p_addr->sun_path, FILESYSTEM_SOCKET_PREFIX);
66 strcat(p_addr->sun_path, name);
67 #endif
68 break;
69
70 case ANDROID_SOCKET_NAMESPACE_RESERVED:
71 namelen = strlen(name) + strlen(ANDROID_RESERVED_SOCKET_PREFIX);
72 /* unix_path_max appears to be missing on linux */
73 if (namelen >
74 sizeof(*p_addr) - offsetof(struct sockaddr_un, sun_path) - 1) {
75 goto error;
76 }
77
78 strcpy(p_addr->sun_path, ANDROID_RESERVED_SOCKET_PREFIX);
79 strcat(p_addr->sun_path, name);
80 break;
81
82 case ANDROID_SOCKET_NAMESPACE_FILESYSTEM:
83 namelen = strlen(name);
84 /* unix_path_max appears to be missing on linux */
85 if (namelen >
86 sizeof(*p_addr) - offsetof(struct sockaddr_un, sun_path) - 1) {
87 goto error;
88 }
89
90 strcpy(p_addr->sun_path, name);
91 break;
92 default:
93 // invalid namespace id
94 return -1;
95 }
96
97 p_addr->sun_family = AF_LOCAL;
98 *alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1;
99 return 0;
100 error:
101 return -1;
102 }
103
104 /**
105 * connect to peer named "name" on fd
106 * returns same fd or -1 on error.
107 * fd is not closed on error. that's your job.
108 *
109 * Used by AndroidSocketImpl
110 */
osi_socket_local_client_connect(int fd,const char * name,int namespaceId,int)111 int osi_socket_local_client_connect(int fd, const char* name, int namespaceId,
112 int /* type */) {
113 struct sockaddr_un addr;
114 socklen_t alen;
115 int err;
116
117 err = osi_socket_make_sockaddr_un(name, namespaceId, &addr, &alen);
118
119 if (err < 0) {
120 goto error;
121 }
122
123 OSI_NO_INTR(err = connect(fd, (struct sockaddr*)&addr, alen));
124 if (err < 0) {
125 goto error;
126 }
127
128 return fd;
129
130 error:
131 return -1;
132 }
133
134 /**
135 * connect to peer named "name"
136 * returns fd or -1 on error
137 */
osi_socket_local_client(const char * name,int namespaceId,int type)138 int osi_socket_local_client(const char* name, int namespaceId, int type) {
139 int s;
140
141 s = socket(AF_LOCAL, type, 0);
142 if (s < 0) return -1;
143
144 if (0 > osi_socket_local_client_connect(s, name, namespaceId, type)) {
145 close(s);
146 return -1;
147 }
148
149 return s;
150 }
151