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      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 
     37 UnixStream::UnixStream(size_t bufSize) :
     38     SocketStream(bufSize)
     39 {
     40 }
     41 
     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
     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 
     89 int UnixStream::listen(unsigned short port)
     90 {
     91     char  path[PATH_MAX];
     92 
     93     if (make_unix_path(path, sizeof(path), port) < 0) {
     94         return -1;
     95     }
     96 
     97     m_sock = socket_local_server(path, ANDROID_SOCKET_NAMESPACE_FILESYSTEM, SOCK_STREAM);
     98     if (!valid()) return int(ERR_INVALID_SOCKET);
     99 
    100     return 0;
    101 }
    102 
    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 
    126 int UnixStream::connect(unsigned short port)
    127 {
    128     char  path[PATH_MAX];
    129 
    130     if (make_unix_path(path, sizeof(path), port) < 0)
    131         return -1;
    132 
    133     m_sock = socket_local_client(path, ANDROID_SOCKET_NAMESPACE_FILESYSTEM, SOCK_STREAM);
    134     if (!valid()) return -1;
    135 
    136     return 0;
    137 }
    138