lib/stream-unix.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 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 "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), streamp);
  61 }
  62
  63 const struct stream_class unix_stream_class = {
  64     "unix",                     /* name */
  65     false,                      /* needs_probes */
  66     unix_open,                  /* open */
  67     NULL,                       /* close */
  68     NULL,                       /* connect */
  69     NULL,                       /* recv */
  70     NULL,                       /* send */
  71     NULL,                       /* run */
  72     NULL,                       /* run_wait */
  73     NULL,                       /* wait */
  74 };
  75 \f
  76 /* Passive UNIX socket. */
  77
  78 static int punix_accept(int fd, const struct sockaddr *sa, size_t sa_len,
  79                         struct stream **streamp);
  80
  81 static int
  82 punix_open(const char *name OVS_UNUSED, char *suffix,
  83            struct pstream **pstreamp, uint8_t dscp OVS_UNUSED)
  84 {
  85     char *bind_path;
  86     int fd, error;
  87
  88     bind_path = abs_file_name(ovs_rundir(), suffix);
  89     fd = make_unix_socket(SOCK_STREAM, true, bind_path, NULL);
  90     if (fd < 0) {
  91         VLOG_ERR("%s: binding failed: %s", bind_path, ovs_strerror(errno));
  92         free(bind_path);
  93         return errno;
  94     }
  95
  96     if (listen(fd, 10) < 0) {
  97         error = errno;
  98         VLOG_ERR("%s: listen: %s", name, ovs_strerror(error));
  99         close(fd);
 100         free(bind_path);
 101         return error;
 102     }
 103
 104     return new_fd_pstream(name, fd, punix_accept, NULL, bind_path, pstreamp);
 105 }
 106
 107 static int
 108 punix_accept(int fd, const struct sockaddr *sa, size_t sa_len,
 109              struct stream **streamp)
 110 {
 111     const struct sockaddr_un *sun = (const struct sockaddr_un *) sa;
 112     int name_len = get_unix_name_len(sa_len);
 113     char name[128];
 114
 115     if (name_len > 0) {
 116         snprintf(name, sizeof name, "unix:%.*s", name_len, sun->sun_path);
 117     } else {
 118         strcpy(name, "unix");
 119     }
 120     return new_fd_stream(name, fd, 0, streamp);
 121 }
 122
 123 const struct pstream_class punix_pstream_class = {
 124     "punix",
 125     false,
 126     punix_open,
 127     NULL,
 128     NULL,
 129     NULL,
 130     NULL,
 131 };
 132