lib/stream-unix.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010 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 "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 /* Number of unix sockets created so far, to ensure binding path uniqueness. */
  43 static int n_unix_sockets;
  44
  45 static int
  46 unix_open(const char *name, char *suffix, struct stream **streamp)
  47 {
  48     const char *connect_path = suffix;
  49     char *bind_path;
  50     int fd;
  51
  52     bind_path = xasprintf("/tmp/stream-unix.%ld.%d",
  53                           (long int) getpid(), n_unix_sockets++);
  54     fd = make_unix_socket(SOCK_STREAM, true, false, bind_path, connect_path);
  55     if (fd < 0) {
  56         VLOG_ERR("%s: connection to %s failed: %s",
  57                  bind_path, connect_path, strerror(-fd));
  58         free(bind_path);
  59         return -fd;
  60     }
  61
  62     return new_fd_stream(name, fd, check_connection_completion(fd),
  63                          bind_path, streamp);
  64 }
  65
  66 struct stream_class unix_stream_class = {
  67     "unix",                     /* name */
  68     unix_open,                  /* open */
  69     NULL,                       /* close */
  70     NULL,                       /* connect */
  71     NULL,                       /* recv */
  72     NULL,                       /* send */
  73     NULL,                       /* run */
  74     NULL,                       /* run_wait */
  75     NULL,                       /* wait */
  76 };
  77 \f
  78 /* Passive UNIX socket. */
  79
  80 static int punix_accept(int fd, const struct sockaddr *sa, size_t sa_len,
  81                         struct stream **streamp);
  82
  83 static int
  84 punix_open(const char *name OVS_UNUSED, char *suffix,
  85            struct pstream **pstreamp)
  86 {
  87     int fd, error;
  88
  89     fd = make_unix_socket(SOCK_STREAM, true, true, suffix, NULL);
  90     if (fd < 0) {
  91         VLOG_ERR("%s: binding failed: %s", suffix, strerror(errno));
  92         return errno;
  93     }
  94
  95     if (listen(fd, 10) < 0) {
  96         error = errno;
  97         VLOG_ERR("%s: listen: %s", name, strerror(error));
  98         close(fd);
  99         return error;
 100     }
 101
 102     return new_fd_pstream("punix", fd, punix_accept,
 103                           xstrdup(suffix), pstreamp);
 104 }
 105
 106 static int
 107 punix_accept(int fd, const struct sockaddr *sa, size_t sa_len,
 108              struct stream **streamp)
 109 {
 110     const struct sockaddr_un *sun = (const struct sockaddr_un *) sa;
 111     int name_len = get_unix_name_len(sa_len);
 112     char name[128];
 113
 114     if (name_len > 0) {
 115         snprintf(name, sizeof name, "unix:%.*s", name_len, sun->sun_path);
 116     } else {
 117         strcpy(name, "unix");
 118     }
 119     return new_fd_stream(name, fd, 0, NULL, streamp);
 120 }
 121
 122 struct pstream_class punix_pstream_class = {
 123     "punix",
 124     punix_open,
 125     NULL,
 126     NULL,
 127     NULL
 128 };
 129