/*

 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 Nicira, Inc.

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at:

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include <config.h>

#include "stream.h"

#include <errno.h>

#include <inttypes.h>

#include <netdb.h>

#include <poll.h>

#include <sys/socket.h>

#include <sys/types.h>

#include <sys/un.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include "ovs-atomic.h"

#include "packets.h"

#include "openvswitch/poll-loop.h"

#include "socket-util.h"

#include "dirs.h"

#include "util.h"

#include "stream-provider.h"

#include "stream-fd.h"

#include "openvswitch/vlog.h"

VLOG_DEFINE_THIS_MODULE(stream_unix);

/* Active UNIX socket. */

static int

unix_open(const char *name, char *suffix, struct stream **streamp,

          uint8_t dscp OVS_UNUSED)

{

    char *connect_path;

    int fd;

    connect_path = abs_file_name(ovs_rundir(), suffix);

    fd = make_unix_socket(SOCK_STREAM, true, NULL, connect_path);

    if (fd < 0) {

        VLOG_DBG("%s: connection failed (%s)",

                 connect_path, ovs_strerror(-fd));

        free(connect_path);

        return -fd;

    }

    free(connect_path);

    return new_fd_stream(xstrdup(name), fd, check_connection_completion(fd),

                         AF_UNIX, streamp);

}

const struct stream_class unix_stream_class = {

    "unix",                     /* name */

    false,                      /* needs_probes */

    unix_open,                  /* open */

    NULL,                       /* close */

    NULL,                       /* connect */

    NULL,                       /* recv */

    NULL,                       /* send */

    NULL,                       /* run */

    NULL,                       /* run_wait */

    NULL,                       /* wait */

};

/* Passive UNIX socket. */

static int punix_accept(int fd, const struct sockaddr_storage *ss,

                        size_t ss_len, struct stream **streamp);

static int

punix_open(const char *name OVS_UNUSED, char *suffix,

           struct pstream **pstreamp, uint8_t dscp OVS_UNUSED)

{

    char *bind_path;

    int fd, error;

    bind_path = abs_file_name(ovs_rundir(), suffix);

    fd = make_unix_socket(SOCK_STREAM, true, bind_path, NULL);

    if (fd < 0) {

        VLOG_ERR("%s: binding failed: %s", bind_path, ovs_strerror(errno));

        free(bind_path);

        return errno;

    }

    if (listen(fd, 64) < 0) {

        error = errno;

        VLOG_ERR("%s: listen: %s", name, ovs_strerror(error));

        close(fd);

        free(bind_path);

        return error;

    }

    return new_fd_pstream(xstrdup(name), fd,

                          punix_accept, bind_path, pstreamp);

}

static int

punix_accept(int fd, const struct sockaddr_storage *ss, size_t ss_len,

             struct stream **streamp)

{

    const struct sockaddr_un *sun = (const struct sockaddr_un *) ss;

    int name_len = get_unix_name_len(sun, ss_len);

    char *bound_name;

    if (name_len > 0) {

        bound_name = xasprintf("unix:%.*s", name_len, sun->sun_path);

    } else {

        /* When a Unix socket connects to us without first binding a name, we

         * don't get any name for it.  It's useful nevertheless to be able to

         * distinguish separate sockets in log messages, so use a counter. */

        static atomic_count next_idx = ATOMIC_COUNT_INIT(0);

        bound_name = xasprintf("unix#%u", atomic_count_inc(&next_idx));

    }

    return new_fd_stream(bound_name, fd, 0, AF_UNIX, streamp);

}

const struct pstream_class punix_pstream_class = {

    "punix",

    false,

    punix_open,

    NULL,

    NULL,

    NULL,

};