1 /*
2 * Copyright (C) 2011 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 #include "UnixStream.h"
17 #include <cutils/sockets.h>
18 #include <errno.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <unistd.h>
22 #include <string.h>
23
24 #include <netinet/in.h>
25 #include <netinet/tcp.h>
26 #include <sys/un.h>
27 #include <sys/stat.h>
28
29 /* Not all systems define PATH_MAX, those who don't generally don't
30 * have a limit on the maximum path size, so use a value that is
31 * large enough for our very limited needs.
32 */
33 #ifndef PATH_MAX
34 #define PATH_MAX 128
35 #endif
36
UnixStream(size_t bufSize)37 UnixStream::UnixStream(size_t bufSize) :
38 SocketStream(bufSize)
39 {
40 }
41
UnixStream(int sock,size_t bufSize)42 UnixStream::UnixStream(int sock, size_t bufSize) :
43 SocketStream(sock, bufSize)
44 {
45 }
46
47 /* Initialize a sockaddr_un with the appropriate values corresponding
48 * to a given 'virtual port'. Returns 0 on success, -1 on error.
49 */
50 static int
make_unix_path(char * path,size_t pathlen,int port_number)51 make_unix_path(char *path, size_t pathlen, int port_number)
52 {
53 char tmp[PATH_MAX]; // temp directory
54 int ret = 0;
55
56 // First, create user-specific temp directory if needed
57 const char* user = getenv("USER");
58 if (user != NULL) {
59 struct stat st;
60 snprintf(tmp, sizeof(tmp), "/tmp/android-%s", user);
61 do {
62 ret = ::lstat(tmp, &st);
63 } while (ret < 0 && errno == EINTR);
64
65 if (ret < 0 && errno == ENOENT) {
66 do {
67 ret = ::mkdir(tmp, 0766);
68 } while (ret < 0 && errno == EINTR);
69 if (ret < 0) {
70 ERR("Could not create temp directory: %s", tmp);
71 user = NULL; // will fall-back to /tmp
72 }
73 }
74 else if (ret < 0) {
75 user = NULL; // will fallback to /tmp
76 }
77 }
78
79 if (user == NULL) { // fallback to /tmp in case of error
80 snprintf(tmp, sizeof(tmp), "/tmp");
81 }
82
83 // Now, initialize it properly
84 snprintf(path, pathlen, "%s/qemu-gles-%d", tmp, port_number);
85 return 0;
86 }
87
88
listen(char addrstr[MAX_ADDRSTR_LEN])89 int UnixStream::listen(char addrstr[MAX_ADDRSTR_LEN])
90 {
91 if (make_unix_path(addrstr, MAX_ADDRSTR_LEN, getpid()) < 0) {
92 return -1;
93 }
94
95 m_sock = socket_local_server(addrstr, ANDROID_SOCKET_NAMESPACE_FILESYSTEM, SOCK_STREAM);
96 if (!valid()) return int(ERR_INVALID_SOCKET);
97
98 return 0;
99 }
100
accept()101 SocketStream * UnixStream::accept()
102 {
103 int clientSock = -1;
104
105 while (true) {
106 struct sockaddr_un addr;
107 socklen_t len = sizeof(addr);
108 clientSock = ::accept(m_sock, (sockaddr *)&addr, &len);
109
110 if (clientSock < 0 && errno == EINTR) {
111 continue;
112 }
113 break;
114 }
115
116 UnixStream *clientStream = NULL;
117
118 if (clientSock >= 0) {
119 clientStream = new UnixStream(clientSock, m_bufsize);
120 }
121 return clientStream;
122 }
123
connect(const char * addr)124 int UnixStream::connect(const char* addr)
125 {
126 m_sock = socket_local_client(addr, ANDROID_SOCKET_NAMESPACE_FILESYSTEM, SOCK_STREAM);
127 if (!valid()) return -1;
128
129 return 0;
130 }
131