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
18 #include "emugl/common/sockets.h"
19
20 #include <errno.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <unistd.h>
24 #include <string.h>
25
26 #include <netinet/in.h>
27 #include <netinet/tcp.h>
28 #include <sys/un.h>
29 #include <sys/stat.h>
30
31 /* Not all systems define PATH_MAX, those who don't generally don't
32 * have a limit on the maximum path size, so use a value that is
33 * large enough for our very limited needs.
34 */
35 #ifndef PATH_MAX
36 #define PATH_MAX 128
37 #endif
38
UnixStream(size_t bufSize)39 UnixStream::UnixStream(size_t bufSize) :
40 SocketStream(bufSize)
41 {
42 }
43
UnixStream(int sock,size_t bufSize)44 UnixStream::UnixStream(int sock, size_t bufSize) :
45 SocketStream(sock, bufSize)
46 {
47 }
48
49 /* Initialize a sockaddr_un with the appropriate values corresponding
50 * to a given 'virtual port'. Returns 0 on success, -1 on error.
51 */
52 static int
make_unix_path(char * path,size_t pathlen,int port_number)53 make_unix_path(char *path, size_t pathlen, int port_number)
54 {
55 char tmp[PATH_MAX]; // temp directory
56 int ret = 0;
57
58 // First, create user-specific temp directory if needed
59 const char* user = getenv("USER");
60 if (user != NULL) {
61 struct stat st;
62 snprintf(tmp, sizeof(tmp), "/tmp/android-%s", user);
63 do {
64 ret = ::lstat(tmp, &st);
65 } while (ret < 0 && errno == EINTR);
66
67 if (ret < 0 && errno == ENOENT) {
68 do {
69 ret = ::mkdir(tmp, 0766);
70 } while (ret < 0 && errno == EINTR);
71 if (ret < 0) {
72 ERR("Could not create temp directory: %s", tmp);
73 user = NULL; // will fall-back to /tmp
74 }
75 }
76 else if (ret < 0) {
77 user = NULL; // will fallback to /tmp
78 }
79 }
80
81 if (user == NULL) { // fallback to /tmp in case of error
82 snprintf(tmp, sizeof(tmp), "/tmp");
83 }
84
85 // Now, initialize it properly
86 snprintf(path, pathlen, "%s/qemu-gles-%d", tmp, port_number);
87 return 0;
88 }
89
90
listen(char addrstr[MAX_ADDRSTR_LEN])91 int UnixStream::listen(char addrstr[MAX_ADDRSTR_LEN])
92 {
93 if (make_unix_path(addrstr, MAX_ADDRSTR_LEN, getpid()) < 0) {
94 return -1;
95 }
96
97 m_sock = emugl::socketLocalServer(addrstr, SOCK_STREAM);
98 if (!valid()) return int(ERR_INVALID_SOCKET);
99
100 return 0;
101 }
102
accept()103 SocketStream * UnixStream::accept()
104 {
105 int clientSock = -1;
106
107 while (true) {
108 struct sockaddr_un addr;
109 socklen_t len = sizeof(addr);
110 clientSock = ::accept(m_sock, (sockaddr *)&addr, &len);
111
112 if (clientSock < 0 && errno == EINTR) {
113 continue;
114 }
115 break;
116 }
117
118 UnixStream *clientStream = NULL;
119
120 if (clientSock >= 0) {
121 clientStream = new UnixStream(clientSock, m_bufsize);
122 }
123 return clientStream;
124 }
125
connect(const char * addr)126 int UnixStream::connect(const char* addr)
127 {
128 m_sock = emugl::socketLocalClient(addr, SOCK_STREAM);
129 if (!valid()) return -1;
130
131 return 0;
132 }
133