2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3 * Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>
5 * gsttcp.c: TCP functions
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
27 #include <sys/types.h>
28 #include <sys/socket.h>
29 #include <netinet/in.h>
30 #include <arpa/inet.h>
33 #include <sys/ioctl.h>
35 #ifdef HAVE_FIONREAD_IN_SYS_FILIO
36 #include <sys/filio.h>
40 #include <gst/gst-i18n-plugin.h>
42 GST_DEBUG_CATEGORY_EXTERN (tcp_debug);
43 #define GST_CAT_DEFAULT tcp_debug
46 #define MSG_NOSIGNAL 0
49 /* resolve host to IP address, throwing errors if it fails */
50 /* host can already be an IP address */
51 /* returns a newly allocated gchar * with the dotted ip address,
52 or NULL, in which case it already fired an error. */
54 gst_tcp_host_to_ip (GstElement * element, const gchar * host)
56 struct hostent *hostinfo;
61 GST_DEBUG_OBJECT (element, "resolving host %s", host);
63 /* first check if it already is an IP address */
64 if (inet_aton (host, &addr)) {
68 /* FIXME: could do a localhost check here */
70 /* perform a name lookup */
71 if (!(hostinfo = gethostbyname (host)))
74 if (hostinfo->h_addrtype != AF_INET)
77 addrs = hostinfo->h_addr_list;
79 /* There could be more than one IP address, but we just return the first */
80 ip = g_strdup (inet_ntoa (*(struct in_addr *) *addrs));
83 GST_DEBUG_OBJECT (element, "resolved to IP %s", ip);
88 GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND, (NULL),
89 ("Could not find IP address for host \"%s\".", host));
94 GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND, (NULL),
95 ("host \"%s\" is not an IP host", host));
100 /* write buffer to given socket incrementally.
101 * Returns number of bytes written.
104 gst_tcp_socket_write (int socket, const void *buf, size_t count)
106 size_t bytes_written = 0;
108 while (bytes_written < count) {
109 ssize_t wrote = send (socket, (const char *) buf + bytes_written,
110 count - bytes_written, MSG_NOSIGNAL);
113 GST_WARNING ("error while writing");
114 return bytes_written;
116 bytes_written += wrote;
119 GST_LOG ("wrote %" G_GSIZE_FORMAT " bytes succesfully", bytes_written);
120 return bytes_written;
123 /* atomically read count bytes into buf, cancellable. return val of GST_FLOW_OK
124 * indicates success, anything else is failure.
127 gst_tcp_socket_read (GstElement * this, int socket, void *buf, size_t count,
137 while (bytes_read < count) {
138 /* do a blocking select on the socket */
139 /* no action (0) is an error too in our case */
140 if ((ret = gst_poll_wait (fdset, GST_CLOCK_TIME_NONE)) <= 0) {
141 if (ret == -1 && errno == EBUSY)
147 /* ask how much is available for reading on the socket */
148 if (ioctl (socket, FIONREAD, &num_to_read) < 0)
151 if (num_to_read == 0)
154 /* sizeof(ssize_t) >= sizeof(int), so I know num_to_read <= SSIZE_MAX */
156 num_to_read = MIN (num_to_read, count - bytes_read);
158 n = read (socket, ((guint8 *) buf) + bytes_read, num_to_read);
166 bytes_read += num_to_read;
174 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
175 ("select failed: %s", g_strerror (errno)));
176 return GST_FLOW_ERROR;
180 GST_DEBUG_OBJECT (this, "Select was cancelled");
181 return GST_FLOW_WRONG_STATE;
185 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
186 ("ioctl failed: %s", g_strerror (errno)));
187 return GST_FLOW_ERROR;
191 GST_DEBUG_OBJECT (this, "Got EOS on socket stream");
192 return GST_FLOW_UNEXPECTED;
196 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
197 ("read failed: %s", g_strerror (errno)));
198 return GST_FLOW_ERROR;
202 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
203 ("short read: wanted %d bytes, got %" G_GSSIZE_FORMAT, num_to_read, n));
204 return GST_FLOW_ERROR;
208 /* close the socket and reset the fd. Used to clean up after errors. */
210 gst_tcp_socket_close (GstPollFD * socket)
212 if (socket->fd >= 0) {
218 /* read a buffer from the given socket
220 * - a GstBuffer in which data should be read
221 * - NULL, indicating a connection close or an error, to be handled with
225 gst_tcp_read_buffer (GstElement * this, int socket, GstPoll * fdset,
234 /* do a blocking select on the socket */
235 /* no action (0) is an error too in our case */
236 if ((ret = gst_poll_wait (fdset, GST_CLOCK_TIME_NONE)) <= 0) {
237 if (ret == -1 && errno == EBUSY)
243 /* ask how much is available for reading on the socket */
244 if (ioctl (socket, FIONREAD, &readsize) < 0)
250 /* sizeof(ssize_t) >= sizeof(int), so I know readsize <= SSIZE_MAX */
252 *buf = gst_buffer_new_and_alloc (readsize);
254 bytes_read = read (socket, GST_BUFFER_DATA (*buf), readsize);
259 if (bytes_read < readsize)
260 /* but mom, you promised to give me readsize bytes! */
263 GST_LOG_OBJECT (this, "returning buffer of size %d", GST_BUFFER_SIZE (*buf));
269 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
270 ("select failed: %s", g_strerror (errno)));
271 return GST_FLOW_ERROR;
275 GST_DEBUG_OBJECT (this, "Select was cancelled");
276 return GST_FLOW_WRONG_STATE;
280 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
281 ("ioctl failed: %s", g_strerror (errno)));
282 return GST_FLOW_ERROR;
286 GST_DEBUG_OBJECT (this, "Got EOS on socket stream");
287 return GST_FLOW_UNEXPECTED;
291 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
292 ("read failed: %s", g_strerror (errno)));
293 gst_buffer_unref (*buf);
295 return GST_FLOW_ERROR;
299 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
300 ("short read: wanted %d bytes, got %" G_GSSIZE_FORMAT, readsize,
302 gst_buffer_unref (*buf);
304 return GST_FLOW_ERROR;
308 /* read a buffer from the given socket
310 * - a GstBuffer in which data should be read
311 * - NULL, indicating a connection close or an error, to be handled with
315 gst_tcp_gdp_read_buffer (GstElement * this, int socket, GstPoll * fdset,
319 guint8 *header = NULL;
321 GST_LOG_OBJECT (this, "Reading %d bytes for buffer packet header",
322 GST_DP_HEADER_LENGTH);
325 header = g_malloc (GST_DP_HEADER_LENGTH);
327 ret = gst_tcp_socket_read (this, socket, header, GST_DP_HEADER_LENGTH, fdset);
329 if (ret != GST_FLOW_OK)
330 goto header_read_error;
332 if (!gst_dp_validate_header (GST_DP_HEADER_LENGTH, header))
335 if (gst_dp_header_payload_type (header) != GST_DP_PAYLOAD_BUFFER)
338 GST_LOG_OBJECT (this, "validated buffer packet header");
340 *buf = gst_dp_buffer_from_header (GST_DP_HEADER_LENGTH, header);
344 ret = gst_tcp_socket_read (this, socket, GST_BUFFER_DATA (*buf),
345 GST_BUFFER_SIZE (*buf), fdset);
347 if (ret != GST_FLOW_OK)
348 goto data_read_error;
360 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
361 ("GDP buffer packet header does not validate"));
363 return GST_FLOW_ERROR;
367 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
368 ("GDP packet contains something that is not a buffer (type %d)",
369 gst_dp_header_payload_type (header)));
371 return GST_FLOW_ERROR;
375 gst_buffer_unref (*buf);
382 gst_tcp_gdp_read_caps (GstElement * this, int socket, GstPoll * fdset,
386 guint8 *header = NULL;
387 guint8 *payload = NULL;
388 size_t payload_length;
390 GST_LOG_OBJECT (this, "Reading %d bytes for caps packet header",
391 GST_DP_HEADER_LENGTH);
394 header = g_malloc (GST_DP_HEADER_LENGTH);
396 ret = gst_tcp_socket_read (this, socket, header, GST_DP_HEADER_LENGTH, fdset);
398 if (ret != GST_FLOW_OK)
399 goto header_read_error;
401 if (!gst_dp_validate_header (GST_DP_HEADER_LENGTH, header))
402 goto header_validate_error;
404 if (gst_dp_header_payload_type (header) != GST_DP_PAYLOAD_CAPS)
407 GST_LOG_OBJECT (this, "validated caps packet header");
409 payload_length = gst_dp_header_payload_length (header);
410 payload = g_malloc (payload_length);
412 GST_LOG_OBJECT (this,
413 "Reading %" G_GSIZE_FORMAT " bytes for caps packet payload",
416 ret = gst_tcp_socket_read (this, socket, payload, payload_length, fdset);
418 if (ret != GST_FLOW_OK)
419 goto payload_read_error;
421 if (!gst_dp_validate_payload (GST_DP_HEADER_LENGTH, header, payload))
422 goto payload_validate_error;
424 *caps = gst_dp_caps_from_packet (GST_DP_HEADER_LENGTH, header, payload);
426 GST_DEBUG_OBJECT (this, "Got caps over GDP: %" GST_PTR_FORMAT, *caps);
439 header_validate_error:
441 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
442 ("GDP caps packet header does not validate"));
444 return GST_FLOW_ERROR;
448 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
449 ("GDP packet contains something that is not a caps (type %d)",
450 gst_dp_header_payload_type (header)));
452 return GST_FLOW_ERROR;
460 payload_validate_error:
462 GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
463 ("GDP caps packet payload does not validate"));
466 return GST_FLOW_ERROR;
470 /* write a GDP header to the socket. Return false if fails. */
472 gst_tcp_gdp_write_buffer (GstElement * this, int socket, GstBuffer * buffer,
473 gboolean fatal, const gchar * host, int port)
479 if (!gst_dp_header_from_buffer (buffer, 0, &length, &header))
482 GST_LOG_OBJECT (this, "writing %d bytes for GDP buffer header", length);
483 wrote = gst_tcp_socket_write (socket, header, length);
495 GST_ELEMENT_ERROR (this, CORE, TOO_LAZY, (NULL),
496 ("Could not create GDP header from buffer"));
502 GST_ELEMENT_ERROR (this, RESOURCE, WRITE,
503 (_("Error while sending data to \"%s:%d\"."), host, port),
504 ("Only %" G_GSIZE_FORMAT " of %u bytes written: %s",
505 wrote, GST_BUFFER_SIZE (buffer), g_strerror (errno)));
510 /* write GDP header and payload to the given socket for the given caps.
511 * Return false if fails. */
513 gst_tcp_gdp_write_caps (GstElement * this, int socket, const GstCaps * caps,
514 gboolean fatal, const char *host, int port)
521 if (!gst_dp_packet_from_caps (caps, 0, &length, &header, &payload))
524 GST_LOG_OBJECT (this, "writing %d bytes for GDP caps header", length);
525 wrote = gst_tcp_socket_write (socket, header, length);
527 goto write_header_error;
529 length = gst_dp_header_payload_length (header);
532 GST_LOG_OBJECT (this, "writing %d bytes for GDP caps payload", length);
533 wrote = gst_tcp_socket_write (socket, payload, length);
537 goto write_payload_error;
545 GST_ELEMENT_ERROR (this, CORE, TOO_LAZY, (NULL),
546 ("Could not create GDP packet from caps"));
554 GST_ELEMENT_ERROR (this, RESOURCE, WRITE,
555 (_("Error while sending gdp header data to \"%s:%d\"."), host, port),
556 ("Only %" G_GSIZE_FORMAT " of %u bytes written: %s",
557 wrote, length, g_strerror (errno)));
563 GST_ELEMENT_ERROR (this, RESOURCE, WRITE,
564 (_("Error while sending gdp payload data to \"%s:%d\"."), host, port),
565 ("Only %" G_GSIZE_FORMAT " of %u bytes written: %s",
566 wrote, length, g_strerror (errno)));