lib/stream-unix.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 Nicira, Inc.
   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 <config.h>
  18 #include "stream.h"
  19 #include <errno.h>
  20 #include <inttypes.h>
  21 #include <netdb.h>
  22 #include <poll.h>
  23 #include <sys/socket.h>
  24 #include <sys/types.h>
  25 #include <sys/un.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include "packets.h"
  30 #include "poll-loop.h"
  31 #include "socket-util.h"
  32 #include "dirs.h"
  33 #include "util.h"
  34 #include "stream-provider.h"
  35 #include "stream-fd.h"
  36 #include "openvswitch/vlog.h"
  37
  38 VLOG_DEFINE_THIS_MODULE(stream_unix);
  39
  40 /* Active UNIX socket. */
  41
  42 static int
  43 unix_open(const char *name, char *suffix, struct stream **streamp,
  44           uint8_t dscp OVS_UNUSED)
  45 {
  46     char *connect_path;
  47     int fd;
  48
  49     connect_path = abs_file_name(ovs_rundir(), suffix);
  50     fd = make_unix_socket(SOCK_STREAM, true, NULL, connect_path);
  51
  52     if (fd < 0) {
  53         VLOG_DBG("%s: connection failed (%s)",
  54                  connect_path, ovs_strerror(-fd));
  55         free(connect_path);
  56         return -fd;
  57     }
  58
  59     free(connect_path);
  60     return new_fd_stream(name, fd, check_connection_completion(fd),
  61                          AF_UNIX, streamp);
  62 }
  63
  64 const struct stream_class unix_stream_class = {
  65     "unix",                     /* name */
  66     false,                      /* needs_probes */
  67     unix_open,                  /* open */
  68     NULL,                       /* close */
  69     NULL,                       /* connect */
  70     NULL,                       /* recv */
  71     NULL,                       /* send */
  72     NULL,                       /* run */
  73     NULL,                       /* run_wait */
  74     NULL,                       /* wait */
  75 };
  76 \f
  77 /* Passive UNIX socket. */
  78
  79 static int punix_accept(int fd, const struct sockaddr_storage *ss,
  80                         size_t ss_len, struct stream **streamp);
  81
  82 static int
  83 punix_open(const char *name OVS_UNUSED, char *suffix,
  84            struct pstream **pstreamp, uint8_t dscp OVS_UNUSED)
  85 {
  86     char *bind_path;
  87     int fd, error;
  88
  89     bind_path = abs_file_name(ovs_rundir(), suffix);
  90     fd = make_unix_socket(SOCK_STREAM, true, bind_path, NULL);
  91     if (fd < 0) {
  92         VLOG_ERR("%s: binding failed: %s", bind_path, ovs_strerror(errno));
  93         free(bind_path);
  94         return errno;
  95     }
  96
  97     if (listen(fd, 64) < 0) {
  98         error = errno;
  99         VLOG_ERR("%s: listen: %s", name, ovs_strerror(error));
 100         close(fd);
 101         free(bind_path);
 102         return error;
 103     }
 104
 105     return new_fd_pstream(name, fd, punix_accept, bind_path, pstreamp);
 106 }
 107
 108 static int
 109 punix_accept(int fd, const struct sockaddr_storage *ss, size_t ss_len,
 110              struct stream **streamp)
 111 {
 112     const struct sockaddr_un *sun = (const struct sockaddr_un *) ss;
 113     int name_len = get_unix_name_len(sun, ss_len);
 114     char name[128];
 115
 116     if (name_len > 0) {
 117         snprintf(name, sizeof name, "unix:%.*s", name_len, sun->sun_path);
 118     } else {
 119         strcpy(name, "unix");
 120     }
 121     return new_fd_stream(name, fd, 0, AF_UNIX, streamp);
 122 }
 123
 124 const struct pstream_class punix_pstream_class = {
 125     "punix",
 126     false,
 127     punix_open,
 128     NULL,
 129     NULL,
 130     NULL,
 131 };
 132