lib/stream-fd-windows.c

   1 /*
   2  * Copyright (c) 2014 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-fd.h"
  19 #include <errno.h>
  20 #include <poll.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/types.h>
  24 #include <unistd.h>
  25 #include <winsock2.h>
  26 #include "fatal-signal.h"
  27 #include "poll-loop.h"
  28 #include "socket-util.h"
  29 #include "stream.h"
  30 #include "stream-provider.h"
  31 #include "util.h"
  32 #include "vlog.h"
  33
  34 VLOG_DEFINE_THIS_MODULE(stream_fd_windows);
  35
  36 /* Active file descriptor stream. */
  37
  38 struct stream_fd
  39 {
  40     struct stream stream;
  41     int fd;
  42 };
  43
  44 static const struct stream_class stream_fd_class;
  45
  46 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 25);
  47
  48 /* Creates a new stream named 'name' that will send and receive data on 'fd'
  49  * and stores a pointer to the stream in '*streamp'.  Initial connection status
  50  * 'connect_status' is interpreted as described for stream_init().
  51  *
  52  * Returns 0 if successful, otherwise a positive errno value.  (The current
  53  * implementation never fails.) */
  54 int
  55 new_fd_stream(const char *name, int fd, int connect_status,
  56               struct stream **streamp)
  57 {
  58     struct stream_fd *s;
  59
  60     s = xmalloc(sizeof *s);
  61     stream_init(&s->stream, &stream_fd_class, connect_status, name);
  62     s->fd = fd;
  63     *streamp = &s->stream;
  64     return 0;
  65 }
  66
  67 static struct stream_fd *
  68 stream_fd_cast(struct stream *stream)
  69 {
  70     stream_assert_class(stream, &stream_fd_class);
  71     return CONTAINER_OF(stream, struct stream_fd, stream);
  72 }
  73
  74 static void
  75 fd_close(struct stream *stream)
  76 {
  77     struct stream_fd *s = stream_fd_cast(stream);
  78     closesocket(s->fd);
  79     free(s);
  80 }
  81
  82 static int
  83 fd_connect(struct stream *stream)
  84 {
  85     struct stream_fd *s = stream_fd_cast(stream);
  86     return check_connection_completion(s->fd);
  87 }
  88
  89 static ssize_t
  90 fd_recv(struct stream *stream, void *buffer, size_t n)
  91 {
  92     struct stream_fd *s = stream_fd_cast(stream);
  93     ssize_t retval;
  94
  95     retval = recv(s->fd, buffer, n, 0);
  96     if (retval < 0) {
  97         retval = -sock_errno();
  98     }
  99     if (retval == -WSAEWOULDBLOCK) {
 100         return -EAGAIN;
 101     }
 102     return retval;
 103 }
 104
 105 static ssize_t
 106 fd_send(struct stream *stream, const void *buffer, size_t n)
 107 {
 108     struct stream_fd *s = stream_fd_cast(stream);
 109     ssize_t retval;
 110
 111     retval = send(s->fd, buffer, n, 0);
 112     if (retval < 0) {
 113         retval = -sock_errno();
 114     }
 115     if (retval == -WSAEWOULDBLOCK) {
 116         return -EAGAIN;
 117     }
 118
 119     return retval;
 120 }
 121
 122 static void
 123 fd_wait(struct stream *stream, enum stream_wait_type wait)
 124 {
 125     struct stream_fd *s = stream_fd_cast(stream);
 126     switch (wait) {
 127     case STREAM_CONNECT:
 128     case STREAM_SEND:
 129         poll_fd_wait(s->fd, POLLOUT);
 130         break;
 131
 132     case STREAM_RECV:
 133         poll_fd_wait(s->fd, POLLIN);
 134         break;
 135
 136     default:
 137         OVS_NOT_REACHED();
 138     }
 139 }
 140
 141 static const struct stream_class stream_fd_class = {
 142     "fd",                       /* name */
 143     false,                      /* needs_probes */
 144     NULL,                       /* open */
 145     fd_close,                   /* close */
 146     fd_connect,                 /* connect */
 147     fd_recv,                    /* recv */
 148     fd_send,                    /* send */
 149     NULL,                       /* run */
 150     NULL,                       /* run_wait */
 151     fd_wait,                    /* wait */
 152 };
 153 \f
 154 /* Passive file descriptor stream. */
 155
 156 struct fd_pstream
 157 {
 158     struct pstream pstream;
 159     int fd;
 160     int (*accept_cb)(int fd, const struct sockaddr_storage *, size_t ss_len,
 161                      struct stream **);
 162     int (*set_dscp_cb)(int fd, uint8_t dscp);
 163     char *unlink_path;
 164 };
 165
 166 static const struct pstream_class fd_pstream_class;
 167
 168 static struct fd_pstream *
 169 fd_pstream_cast(struct pstream *pstream)
 170 {
 171     pstream_assert_class(pstream, &fd_pstream_class);
 172     return CONTAINER_OF(pstream, struct fd_pstream, pstream);
 173 }
 174
 175 /* Creates a new pstream named 'name' that will accept new socket connections
 176  * on 'fd' and stores a pointer to the stream in '*pstreamp'.
 177  *
 178  * When a connection has been accepted, 'accept_cb' will be called with the new
 179  * socket fd 'fd' and the remote address of the connection 'sa' and 'sa_len'.
 180  * accept_cb must return 0 if the connection is successful, in which case it
 181  * must initialize '*streamp' to the new stream, or a positive errno value on
 182  * error.  In either case accept_cb takes ownership of the 'fd' passed in.
 183  *
 184  * When '*pstreamp' is closed, then 'unlink_path' (if nonnull) will be passed
 185  * to fatal_signal_unlink_file_now() and freed with free().
 186  *
 187  * Returns 0 if successful, otherwise a positive errno value.  (The current
 188  * implementation never fails.) */
 189 int
 190 new_fd_pstream(const char *name, int fd,
 191                int (*accept_cb)(int fd, const struct sockaddr_storage *ss,
 192                                 size_t ss_len, struct stream **streamp),
 193                int (*set_dscp_cb)(int fd, uint8_t dscp),
 194                char *unlink_path, struct pstream **pstreamp)
 195 {
 196     struct fd_pstream *ps = xmalloc(sizeof *ps);
 197     pstream_init(&ps->pstream, &fd_pstream_class, name);
 198     ps->fd = fd;
 199     ps->accept_cb = accept_cb;
 200     ps->set_dscp_cb = set_dscp_cb;
 201     ps->unlink_path = unlink_path;
 202     *pstreamp = &ps->pstream;
 203     return 0;
 204 }
 205
 206 static void
 207 pfd_close(struct pstream *pstream)
 208 {
 209     struct fd_pstream *ps = fd_pstream_cast(pstream);
 210     closesocket(ps->fd);
 211     if (ps->unlink_path) {
 212         fatal_signal_unlink_file_now(ps->unlink_path);
 213         free(ps->unlink_path);
 214     }
 215     free(ps);
 216 }
 217
 218 static int
 219 pfd_accept(struct pstream *pstream, struct stream **new_streamp)
 220 {
 221     struct fd_pstream *ps = fd_pstream_cast(pstream);
 222     struct sockaddr_storage ss;
 223     socklen_t ss_len = sizeof ss;
 224     int new_fd;
 225     int retval;
 226
 227     new_fd = accept(ps->fd, (struct sockaddr *) &ss, &ss_len);
 228     if (new_fd < 0) {
 229         retval = sock_errno();
 230         if (retval == WSAEWOULDBLOCK) {
 231             return EAGAIN;
 232         }
 233         return retval;
 234     }
 235
 236     retval = set_nonblocking(new_fd);
 237     if (retval) {
 238         closesocket(new_fd);
 239         return retval;
 240     }
 241
 242     return ps->accept_cb(new_fd, &ss, ss_len, new_streamp);
 243 }
 244
 245 static void
 246 pfd_wait(struct pstream *pstream)
 247 {
 248     struct fd_pstream *ps = fd_pstream_cast(pstream);
 249     poll_fd_wait(ps->fd, POLLIN);
 250 }
 251
 252 static int
 253 pfd_set_dscp(struct pstream *pstream, uint8_t dscp)
 254 {
 255     struct fd_pstream *ps = fd_pstream_cast(pstream);
 256     if (ps->set_dscp_cb) {
 257         return ps->set_dscp_cb(ps->fd, dscp);
 258     }
 259     return 0;
 260 }
 261
 262 static const struct pstream_class fd_pstream_class = {
 263     "pstream",
 264     false,
 265     NULL,
 266     pfd_close,
 267     pfd_accept,
 268     pfd_wait,
 269     pfd_set_dscp,
 270 };