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/*
* Copyright (c) 2008, 2009, 2010, 2012 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-fd.h"
#include <assert.h>
#include <errno.h>
#include <poll.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include "fatal-signal.h"
#include "leak-checker.h"
#include "poll-loop.h"
#include "socket-util.h"
#include "stress.h"
#include "util.h"
#include "stream-provider.h"
#include "stream.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(stream_fd);
/* Active file descriptor stream. */
struct stream_fd
{
struct stream stream;
int fd;
};
static const struct stream_class stream_fd_class;
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 25);
static void maybe_unlink_and_free(char *path);
/* Creates a new stream named 'name' that will send and receive data on 'fd'
* and stores a pointer to the stream in '*streamp'. Initial connection status
* 'connect_status' is interpreted as described for stream_init().
*
* Returns 0 if successful, otherwise a positive errno value. (The current
* implementation never fails.) */
int
new_fd_stream(const char *name, int fd, int connect_status,
struct stream **streamp)
{
struct stream_fd *s;
s = xmalloc(sizeof *s);
stream_init(&s->stream, &stream_fd_class, connect_status, name);
s->fd = fd;
*streamp = &s->stream;
return 0;
}
static struct stream_fd *
stream_fd_cast(struct stream *stream)
{
stream_assert_class(stream, &stream_fd_class);
return CONTAINER_OF(stream, struct stream_fd, stream);
}
static void
fd_close(struct stream *stream)
{
struct stream_fd *s = stream_fd_cast(stream);
close(s->fd);
free(s);
}
static int
fd_connect(struct stream *stream)
{
struct stream_fd *s = stream_fd_cast(stream);
return check_connection_completion(s->fd);
}
STRESS_OPTION(
stream_flaky_recv, "simulate failure of fd stream recvs",
100, 0, -1, 0);
static ssize_t
fd_recv(struct stream *stream, void *buffer, size_t n)
{
struct stream_fd *s = stream_fd_cast(stream);
ssize_t retval;
if (STRESS(stream_flaky_recv)) {
return -EIO;
}
retval = read(s->fd, buffer, n);
return retval >= 0 ? retval : -errno;
}
STRESS_OPTION(
stream_flaky_send, "simulate failure of fd stream sends",
100, 0, -1, 0);
static ssize_t
fd_send(struct stream *stream, const void *buffer, size_t n)
{
struct stream_fd *s = stream_fd_cast(stream);
ssize_t retval;
if (STRESS(stream_flaky_send)) {
return -EIO;
}
retval = write(s->fd, buffer, n);
return (retval > 0 ? retval
: retval == 0 ? -EAGAIN
: -errno);
}
static void
fd_wait(struct stream *stream, enum stream_wait_type wait)
{
struct stream_fd *s = stream_fd_cast(stream);
switch (wait) {
case STREAM_CONNECT:
case STREAM_SEND:
poll_fd_wait(s->fd, POLLOUT);
break;
case STREAM_RECV:
poll_fd_wait(s->fd, POLLIN);
break;
default:
NOT_REACHED();
}
}
static const struct stream_class stream_fd_class = {
"fd", /* name */
false, /* needs_probes */
NULL, /* open */
fd_close, /* close */
fd_connect, /* connect */
fd_recv, /* recv */
fd_send, /* send */
NULL, /* run */
NULL, /* run_wait */
fd_wait, /* wait */
};
/* Passive file descriptor stream. */
struct fd_pstream
{
struct pstream pstream;
int fd;
int (*accept_cb)(int fd, const struct sockaddr *, size_t sa_len,
struct stream **);
int (*set_dscp_cb)(int fd, uint8_t dscp);
char *unlink_path;
};
static struct pstream_class fd_pstream_class;
static struct fd_pstream *
fd_pstream_cast(struct pstream *pstream)
{
pstream_assert_class(pstream, &fd_pstream_class);
return CONTAINER_OF(pstream, struct fd_pstream, pstream);
}
/* Creates a new pstream named 'name' that will accept new socket connections
* on 'fd' and stores a pointer to the stream in '*pstreamp'.
*
* When a connection has been accepted, 'accept_cb' will be called with the new
* socket fd 'fd' and the remote address of the connection 'sa' and 'sa_len'.
* accept_cb must return 0 if the connection is successful, in which case it
* must initialize '*streamp' to the new stream, or a positive errno value on
* error. In either case accept_cb takes ownership of the 'fd' passed in.
*
* When '*pstreamp' is closed, then 'unlink_path' (if nonnull) will be passed
* to fatal_signal_unlink_file_now() and freed with free().
*
* Returns 0 if successful, otherwise a positive errno value. (The current
* implementation never fails.) */
int
new_fd_pstream(const char *name, int fd,
int (*accept_cb)(int fd, const struct sockaddr *sa,
size_t sa_len, struct stream **streamp),
int (*set_dscp_cb)(int fd, uint8_t dscp),
char *unlink_path, struct pstream **pstreamp)
{
struct fd_pstream *ps = xmalloc(sizeof *ps);
pstream_init(&ps->pstream, &fd_pstream_class, name);
ps->fd = fd;
ps->accept_cb = accept_cb;
ps->set_dscp_cb = set_dscp_cb;
ps->unlink_path = unlink_path;
*pstreamp = &ps->pstream;
return 0;
}
static void
pfd_close(struct pstream *pstream)
{
struct fd_pstream *ps = fd_pstream_cast(pstream);
close(ps->fd);
maybe_unlink_and_free(ps->unlink_path);
free(ps);
}
static int
pfd_accept(struct pstream *pstream, struct stream **new_streamp)
{
struct fd_pstream *ps = fd_pstream_cast(pstream);
struct sockaddr_storage ss;
socklen_t ss_len = sizeof ss;
int new_fd;
int retval;
new_fd = accept(ps->fd, (struct sockaddr *) &ss, &ss_len);
if (new_fd < 0) {
retval = errno;
if (retval != EAGAIN) {
VLOG_DBG_RL(&rl, "accept: %s", strerror(retval));
}
return retval;
}
retval = set_nonblocking(new_fd);
if (retval) {
close(new_fd);
return retval;
}
return ps->accept_cb(new_fd, (const struct sockaddr *) &ss, ss_len,
new_streamp);
}
static void
pfd_wait(struct pstream *pstream)
{
struct fd_pstream *ps = fd_pstream_cast(pstream);
poll_fd_wait(ps->fd, POLLIN);
}
static int
pfd_set_dscp(struct pstream *pstream, uint8_t dscp)
{
struct fd_pstream *ps = fd_pstream_cast(pstream);
if (ps->set_dscp_cb) {
return ps->set_dscp_cb(ps->fd, dscp);
}
return 0;
}
static struct pstream_class fd_pstream_class = {
"pstream",
false,
NULL,
pfd_close,
pfd_accept,
pfd_wait,
pfd_set_dscp,
};
/* Helper functions. */
static void
maybe_unlink_and_free(char *path)
{
if (path) {
fatal_signal_unlink_file_now(path);
free(path);
}
}
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