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 <errno.h>
18 #include <stddef.h>
19 #include <stdlib.h>
20 #include <string.h>
21 #include <sys/select.h>
22 #include <sys/socket.h>
23 #include <sys/types.h>
24 #include <sys/un.h>
25 #include <unistd.h>
26
27 #include "osi/include/osi.h"
28 #include "osi/include/socket_utils/socket_local.h"
29 #include "osi/include/socket_utils/sockets.h"
30
31 #define LISTEN_BACKLOG 4
32
33 /* Documented in header file. */
osi_socket_make_sockaddr_un(const char * name,int namespaceId,struct sockaddr_un * p_addr,socklen_t * alen)34 int osi_socket_make_sockaddr_un(const char* name, int namespaceId,
35 struct sockaddr_un* p_addr, socklen_t* alen) {
36 memset(p_addr, 0, sizeof(*p_addr));
37 size_t namelen;
38
39 switch (namespaceId) {
40 case ANDROID_SOCKET_NAMESPACE_ABSTRACT:
41 #if defined(__linux__)
42 namelen = strlen(name);
43
44 // Test with length +1 for the *initial* '\0'.
45 if ((namelen + 1) > sizeof(p_addr->sun_path)) {
46 goto error;
47 }
48
49 /*
50 * Note: The path in this case is *not* supposed to be
51 * '\0'-terminated. ("man 7 unix" for the gory details.)
52 */
53
54 p_addr->sun_path[0] = 0;
55 memcpy(p_addr->sun_path + 1, name, namelen);
56 #else
57 /* this OS doesn't have the Linux abstract namespace */
58
59 namelen = strlen(name) + strlen(FILESYSTEM_SOCKET_PREFIX);
60 /* unix_path_max appears to be missing on linux */
61 if (namelen >
62 sizeof(*p_addr) - offsetof(struct sockaddr_un, sun_path) - 1) {
63 goto error;
64 }
65
66 strcpy(p_addr->sun_path, FILESYSTEM_SOCKET_PREFIX);
67 strcat(p_addr->sun_path, name);
68 #endif
69 break;
70
71 case ANDROID_SOCKET_NAMESPACE_RESERVED:
72 namelen = strlen(name) + strlen(ANDROID_RESERVED_SOCKET_PREFIX);
73 /* unix_path_max appears to be missing on linux */
74 if (namelen >
75 sizeof(*p_addr) - offsetof(struct sockaddr_un, sun_path) - 1) {
76 goto error;
77 }
78
79 strcpy(p_addr->sun_path, ANDROID_RESERVED_SOCKET_PREFIX);
80 strcat(p_addr->sun_path, name);
81 break;
82
83 case ANDROID_SOCKET_NAMESPACE_FILESYSTEM:
84 namelen = strlen(name);
85 /* unix_path_max appears to be missing on linux */
86 if (namelen >
87 sizeof(*p_addr) - offsetof(struct sockaddr_un, sun_path) - 1) {
88 goto error;
89 }
90
91 strcpy(p_addr->sun_path, name);
92 break;
93 default:
94 // invalid namespace id
95 return -1;
96 }
97
98 p_addr->sun_family = AF_LOCAL;
99 *alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1;
100 return 0;
101 error:
102 return -1;
103 }
104
105 /**
106 * connect to peer named "name" on fd
107 * returns same fd or -1 on error.
108 * fd is not closed on error. that's your job.
109 *
110 * Used by AndroidSocketImpl
111 */
osi_socket_local_client_connect(int fd,const char * name,int namespaceId,int type UNUSED_ATTR)112 int osi_socket_local_client_connect(int fd, const char* name, int namespaceId,
113 int type UNUSED_ATTR) {
114 struct sockaddr_un addr;
115 socklen_t alen;
116 int err;
117
118 err = osi_socket_make_sockaddr_un(name, namespaceId, &addr, &alen);
119
120 if (err < 0) {
121 goto error;
122 }
123
124 OSI_NO_INTR(err = connect(fd, (struct sockaddr*)&addr, alen));
125 if (err < 0) {
126 goto error;
127 }
128
129 return fd;
130
131 error:
132 return -1;
133 }
134
135 /**
136 * connect to peer named "name"
137 * returns fd or -1 on error
138 */
osi_socket_local_client(const char * name,int namespaceId,int type)139 int osi_socket_local_client(const char* name, int namespaceId, int type) {
140 int s;
141
142 s = socket(AF_LOCAL, type, 0);
143 if (s < 0) return -1;
144
145 if (0 > osi_socket_local_client_connect(s, name, namespaceId, type)) {
146 close(s);
147 return -1;
148 }
149
150 return s;
151 }
152