lib/stream-unix.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2011, 2012 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 <assert.h>
  20 #include <errno.h>
  21 #include <inttypes.h>
  22 #include <netdb.h>
  23 #include <poll.h>
  24 #include <sys/socket.h>
  25 #include <sys/types.h>
  26 #include <sys/un.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include "packets.h"
  31 #include "poll-loop.h"
  32 #include "socket-util.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     const char *connect_path = suffix;
  47     int fd;
  48
  49     fd = make_unix_socket(SOCK_STREAM, true, false, NULL, connect_path);
  50     if (fd < 0) {
  51         VLOG_ERR("%s: connection failed (%s)", connect_path, strerror(-fd));
  52         return -fd;
  53     }
  54
  55     return new_fd_stream(name, fd, check_connection_completion(fd), streamp);
  56 }
  57
  58 const struct stream_class unix_stream_class = {
  59     "unix",                     /* name */
  60     false,                      /* needs_probes */
  61     unix_open,                  /* open */
  62     NULL,                       /* close */
  63     NULL,                       /* connect */
  64     NULL,                       /* recv */
  65     NULL,                       /* send */
  66     NULL,                       /* run */
  67     NULL,                       /* run_wait */
  68     NULL,                       /* wait */
  69 };
  70 \f
  71 /* Passive UNIX socket. */
  72
  73 static int punix_accept(int fd, const struct sockaddr *sa, size_t sa_len,
  74                         struct stream **streamp);
  75
  76 static int
  77 punix_open(const char *name OVS_UNUSED, char *suffix,
  78            struct pstream **pstreamp, uint8_t dscp OVS_UNUSED)
  79 {
  80     int fd, error;
  81
  82     fd = make_unix_socket(SOCK_STREAM, true, true, suffix, NULL);
  83     if (fd < 0) {
  84         VLOG_ERR("%s: binding failed: %s", suffix, strerror(errno));
  85         return errno;
  86     }
  87
  88     if (listen(fd, 10) < 0) {
  89         error = errno;
  90         VLOG_ERR("%s: listen: %s", name, strerror(error));
  91         close(fd);
  92         return error;
  93     }
  94
  95     return new_fd_pstream(name, fd, punix_accept,
  96                           xstrdup(suffix), pstreamp);
  97 }
  98
  99 static int
 100 punix_accept(int fd, const struct sockaddr *sa, size_t sa_len,
 101              struct stream **streamp)
 102 {
 103     const struct sockaddr_un *sun = (const struct sockaddr_un *) sa;
 104     int name_len = get_unix_name_len(sa_len);
 105     char name[128];
 106
 107     if (name_len > 0) {
 108         snprintf(name, sizeof name, "unix:%.*s", name_len, sun->sun_path);
 109     } else {
 110         strcpy(name, "unix");
 111     }
 112     return new_fd_stream(name, fd, 0, streamp);
 113 }
 114
 115 const struct pstream_class punix_pstream_class = {
 116     "punix",
 117     false,
 118     punix_open,
 119     NULL,
 120     NULL,
 121     NULL
 122 };
 123