lib/vconn-unix.c

   1 /*
   2  * Copyright (c) 2008, 2009 Nicira Networks.
   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 "vconn.h"
  19 #include <assert.h>
  20 #include <errno.h>
  21 #include <inttypes.h>
  22 #include <netdb.h>
  23 #include <poll.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 "ofpbuf.h"
  30 #include "openflow/openflow.h"
  31 #include "packets.h"
  32 #include "poll-loop.h"
  33 #include "socket-util.h"
  34 #include "util.h"
  35 #include "vconn-provider.h"
  36 #include "vconn-stream.h"
  37
  38 #include "vlog.h"
  39 #define THIS_MODULE VLM_vconn_unix
  40
  41 /* Active UNIX socket. */
  42
  43 /* Number of unix sockets created so far, to ensure binding path uniqueness. */
  44 static int n_unix_sockets;
  45
  46 static int
  47 unix_open(const char *name, char *suffix, struct vconn **vconnp)
  48 {
  49     const char *connect_path = suffix;
  50     char *bind_path;
  51     int fd;
  52
  53     bind_path = xasprintf("/tmp/vconn-unix.%ld.%d",
  54                           (long int) getpid(), n_unix_sockets++);
  55     fd = make_unix_socket(SOCK_STREAM, true, false, bind_path, connect_path);
  56     if (fd < 0) {
  57         VLOG_ERR("%s: connection to %s failed: %s",
  58                  bind_path, connect_path, strerror(-fd));
  59         free(bind_path);
  60         return -fd;
  61     }
  62
  63     return new_stream_vconn(name, fd, check_connection_completion(fd),
  64                             bind_path, vconnp);
  65 }
  66
  67 struct vconn_class unix_vconn_class = {
  68     "unix",                     /* name */
  69     unix_open,                  /* open */
  70     NULL,                       /* close */
  71     NULL,                       /* connect */
  72     NULL,                       /* recv */
  73     NULL,                       /* send */
  74     NULL,                       /* wait */
  75 };
  76 \f
  77 /* Passive UNIX socket. */
  78
  79 static int punix_accept(int fd, const struct sockaddr *sa, size_t sa_len,
  80                         struct vconn **vconnp);
  81
  82 static int
  83 punix_open(const char *name UNUSED, char *suffix, struct pvconn **pvconnp)
  84 {
  85     int fd, error;
  86
  87     fd = make_unix_socket(SOCK_STREAM, true, true, suffix, NULL);
  88     if (fd < 0) {
  89         VLOG_ERR("%s: binding failed: %s", suffix, strerror(errno));
  90         return errno;
  91     }
  92
  93     error = set_nonblocking(fd);
  94     if (error) {
  95         close(fd);
  96         return error;
  97     }
  98
  99     if (listen(fd, 10) < 0) {
 100         error = errno;
 101         VLOG_ERR("%s: listen: %s", name, strerror(error));
 102         close(fd);
 103         return error;
 104     }
 105
 106     return new_pstream_pvconn("punix", fd, punix_accept,
 107                               xstrdup(suffix), pvconnp);
 108 }
 109
 110 static int
 111 punix_accept(int fd, const struct sockaddr *sa, size_t sa_len,
 112              struct vconn **vconnp)
 113 {
 114     const struct sockaddr_un *sun = (const struct sockaddr_un *) sa;
 115     int name_len = get_unix_name_len(sa_len);
 116     char name[128];
 117
 118     if (name_len > 0) {
 119         snprintf(name, sizeof name, "unix:%.*s", name_len, sun->sun_path);
 120     } else {
 121         strcpy(name, "unix");
 122     }
 123     return new_stream_vconn(name, fd, 0, NULL, vconnp);
 124 }
 125
 126 struct pvconn_class punix_pvconn_class = {
 127     "punix",
 128     punix_open,
 129     NULL,
 130     NULL,
 131     NULL
 132 };
 133