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      1 /* libs/cutils/socket_local_server.c
      2 **
      3 ** Copyright 2006, The Android Open Source Project
      4 **
      5 ** Licensed under the Apache License, Version 2.0 (the "License");
      6 ** you may not use this file except in compliance with the License.
      7 ** You may obtain a copy of the License at
      8 **
      9 **     http://www.apache.org/licenses/LICENSE-2.0
     10 **
     11 ** Unless required by applicable law or agreed to in writing, software
     12 ** distributed under the License is distributed on an "AS IS" BASIS,
     13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 ** See the License for the specific language governing permissions and
     15 ** limitations under the License.
     16 */
     17 
     18 #include <cutils/sockets.h>
     19 
     20 #include <stdlib.h>
     21 #include <string.h>
     22 #include <unistd.h>
     23 #include <errno.h>
     24 #include <stddef.h>
     25 
     26 #ifdef HAVE_WINSOCK
     27 
     28 int socket_local_server(const char *name, int namespaceId, int type)
     29 {
     30     errno = ENOSYS;
     31     return -1;
     32 }
     33 
     34 #else /* !HAVE_WINSOCK */
     35 
     36 #include <sys/socket.h>
     37 #include <sys/un.h>
     38 #include <sys/select.h>
     39 #include <sys/types.h>
     40 #include <netinet/in.h>
     41 
     42 #include "socket_local.h"
     43 
     44 #define LISTEN_BACKLOG 4
     45 
     46 
     47 /**
     48  * Binds a pre-created socket(AF_LOCAL) 's' to 'name'
     49  * returns 's' on success, -1 on fail
     50  *
     51  * Does not call listen()
     52  */
     53 int socket_local_server_bind(int s, const char *name, int namespaceId)
     54 {
     55     struct sockaddr_un addr;
     56     socklen_t alen;
     57     int n;
     58     int err;
     59 
     60     err = socket_make_sockaddr_un(name, namespaceId, &addr, &alen);
     61 
     62     if (err < 0) {
     63         return -1;
     64     }
     65 
     66     /* basically: if this is a filesystem path, unlink first */
     67 #ifndef HAVE_LINUX_LOCAL_SOCKET_NAMESPACE
     68     if (1) {
     69 #else
     70     if (namespaceId == ANDROID_SOCKET_NAMESPACE_RESERVED
     71         || namespaceId == ANDROID_SOCKET_NAMESPACE_FILESYSTEM) {
     72 #endif
     73         /*ignore ENOENT*/
     74         unlink(addr.sun_path);
     75     }
     76 
     77     n = 1;
     78     setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n));
     79 
     80     if(bind(s, (struct sockaddr *) &addr, alen) < 0) {
     81         return -1;
     82     }
     83 
     84     return s;
     85 
     86 }
     87 
     88 
     89 /** Open a server-side UNIX domain datagram socket in the Linux non-filesystem
     90  *  namespace
     91  *
     92  *  Returns fd on success, -1 on fail
     93  */
     94 
     95 int socket_local_server(const char *name, int namespace, int type)
     96 {
     97     int err;
     98     int s;
     99 
    100     s = socket(AF_LOCAL, type, 0);
    101     if (s < 0) return -1;
    102 
    103     err = socket_local_server_bind(s, name, namespace);
    104 
    105     if (err < 0) {
    106         close(s);
    107         return -1;
    108     }
    109 
    110     if (type == SOCK_STREAM) {
    111         int ret;
    112 
    113         ret = listen(s, LISTEN_BACKLOG);
    114 
    115         if (ret < 0) {
    116             close(s);
    117             return -1;
    118         }
    119     }
    120 
    121     return s;
    122 }
    123 
    124 #endif /* !HAVE_WINSOCK */
    125