2004-05-20 10:15:31 +00:00
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/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>
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*
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* gsttcp.c: TCP functions
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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2004-06-02 11:47:10 +00:00
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#include <sys/types.h>
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#include <sys/socket.h>
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2004-05-20 10:15:31 +00:00
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <glib.h>
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#include <gst/gst.h>
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#include <gst/gst-i18n-plugin.h>
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#include <gst/dataprotocol/dataprotocol.h>
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2004-06-05 15:40:10 +00:00
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#ifndef MSG_NOSIGNAL
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#define MSG_NOSIGNAL 0
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#endif
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2004-05-20 10:15:31 +00:00
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/* resolve host to IP address, throwing errors if it fails */
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/* host can already be an IP address */
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/* returns a newly allocated gchar * with the dotted ip address */
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gchar *
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gst_tcp_host_to_ip (GstElement * element, const gchar * host)
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{
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struct hostent *hostinfo;
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char **addrs;
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gchar *ip;
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struct in_addr addr;
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/* first check if it already is an IP address */
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if (inet_aton (host, &addr)) {
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return g_strdup (host);
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}
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/* FIXME: could do a localhost check here */
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/* perform a name lookup */
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hostinfo = gethostbyname (host);
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if (!hostinfo) {
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GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND, (NULL),
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("Could not find IP address for host \"%s\".", host));
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return NULL;
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}
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if (hostinfo->h_addrtype != AF_INET) {
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GST_ELEMENT_ERROR (element, RESOURCE, NOT_FOUND, (NULL),
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("host \"%s\" is not an IP host", host));
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return NULL;
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}
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addrs = hostinfo->h_addr_list;
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/* There could be more than one IP address, but we just return the first */
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ip = g_strdup (inet_ntoa (*(struct in_addr *) *addrs));
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return ip;
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}
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/* write buffer to given socket incrementally.
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* Returns number of bytes written.
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*/
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gint
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gst_tcp_socket_write (int socket, const void *buf, size_t count)
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{
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size_t bytes_written = 0;
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while (bytes_written < count) {
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2004-06-03 15:34:07 +00:00
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ssize_t wrote = send (socket, buf + bytes_written,
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count - bytes_written, MSG_NOSIGNAL);
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2004-05-20 10:15:31 +00:00
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if (wrote <= 0) {
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return bytes_written;
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}
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bytes_written += wrote;
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}
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if (bytes_written < 0)
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GST_DEBUG ("error while writing");
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else
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GST_DEBUG ("wrote %d bytes succesfully", bytes_written);
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return bytes_written;
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}
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/* read number of bytes from a socket into a given buffer incrementally.
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* Returns number of bytes read.
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*/
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gint
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gst_tcp_socket_read (int socket, void *buf, size_t count)
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{
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size_t bytes_read = 0;
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while (bytes_read < count) {
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2004-06-02 16:50:50 +00:00
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ssize_t ret = read (socket, buf + bytes_read,
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2004-05-20 10:15:31 +00:00
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count - bytes_read);
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if (ret <= 0) {
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return bytes_read;
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}
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bytes_read += ret;
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}
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if (bytes_read < 0)
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GST_DEBUG ("error while reading");
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else
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GST_DEBUG ("read %d bytes succesfully", bytes_read);
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return bytes_read;
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}
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/* read the gdp buffer header from the given socket
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* returns a GstData,
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* representing the new GstBuffer to read data into, or an EOS event
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*/
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GstData *
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gst_tcp_gdp_read_header (GstElement * this, int socket)
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{
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size_t header_length = GST_DP_HEADER_LENGTH;
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size_t readsize;
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guint8 *header = NULL;
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2004-06-02 16:50:50 +00:00
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ssize_t ret;
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2004-05-20 10:15:31 +00:00
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GstBuffer *buffer;
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header = g_malloc (header_length);
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readsize = header_length;
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GST_DEBUG_OBJECT (this, "Reading %d bytes for buffer packet header",
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readsize);
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2004-06-08 15:47:53 +00:00
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ret = gst_tcp_socket_read (socket, header, readsize);
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2004-05-20 10:15:31 +00:00
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/* if we read 0 bytes, and we're blocking, we hit eos */
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if (ret == 0) {
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GST_DEBUG ("blocking read returns 0, EOS");
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2004-06-08 14:24:52 +00:00
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g_free (header);
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2004-05-20 10:15:31 +00:00
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gst_element_set_eos (GST_ELEMENT (this));
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return GST_DATA (gst_event_new (GST_EVENT_EOS));
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}
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if (ret < 0) {
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GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
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2004-06-08 14:24:52 +00:00
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g_free (header);
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2004-05-20 10:15:31 +00:00
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return NULL;
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}
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if (ret != readsize) {
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2004-06-02 11:47:10 +00:00
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g_warning ("Wanted %d bytes, got %d bytes", (int) readsize, (int) ret);
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2004-05-20 10:15:31 +00:00
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}
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g_assert (ret == readsize);
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if (!gst_dp_validate_header (header_length, header)) {
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GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
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("GDP buffer packet header does not validate"));
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g_free (header);
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return NULL;
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}
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GST_DEBUG_OBJECT (this, "validated buffer packet header");
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buffer = gst_dp_buffer_from_header (header_length, header);
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2004-06-08 14:24:52 +00:00
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g_free (header);
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2004-05-20 10:15:31 +00:00
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GST_DEBUG_OBJECT (this, "created new buffer %p from packet header", buffer);
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return GST_DATA (buffer);
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}
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/* read the GDP caps packet from the given socket
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* returns the caps, or NULL in case of an error */
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GstCaps *
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gst_tcp_gdp_read_caps (GstElement * this, int socket)
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{
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size_t header_length = GST_DP_HEADER_LENGTH;
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size_t readsize;
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guint8 *header = NULL;
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guint8 *payload = NULL;
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2004-06-02 16:50:50 +00:00
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ssize_t ret;
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2004-05-20 10:15:31 +00:00
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GstCaps *caps;
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gchar *string;
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header = g_malloc (header_length);
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readsize = header_length;
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2004-06-08 14:24:52 +00:00
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2004-05-20 10:15:31 +00:00
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GST_LOG_OBJECT (this, "Reading %d bytes for caps packet header", readsize);
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2004-06-08 15:47:53 +00:00
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ret = gst_tcp_socket_read (socket, header, readsize);
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2004-05-20 10:15:31 +00:00
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if (ret < 0) {
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2004-06-08 14:24:52 +00:00
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g_free (header);
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2004-05-20 10:15:31 +00:00
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GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
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return NULL;
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}
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g_assert (ret == readsize);
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if (!gst_dp_validate_header (header_length, header)) {
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GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
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("GDP caps packet header does not validate"));
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g_free (header);
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return NULL;
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}
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readsize = gst_dp_header_payload_length (header);
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payload = g_malloc (readsize);
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GST_LOG_OBJECT (this, "Reading %d bytes for caps packet payload", readsize);
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2004-06-08 15:47:53 +00:00
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ret = gst_tcp_socket_read (socket, payload, readsize);
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2004-05-20 10:15:31 +00:00
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if (ret < 0) {
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GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
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g_free (header);
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g_free (payload);
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return NULL;
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}
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if (gst_dp_header_payload_type (header) != GST_DP_PAYLOAD_CAPS) {
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GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
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("Header read doesn't describe CAPS payload"));
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g_free (header);
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g_free (payload);
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return NULL;
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}
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g_assert (ret == readsize);
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if (!gst_dp_validate_payload (readsize, header, payload)) {
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GST_ELEMENT_ERROR (this, RESOURCE, READ, (NULL),
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("GDP caps packet payload does not validate"));
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g_free (header);
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g_free (payload);
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return NULL;
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}
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caps = gst_dp_caps_from_packet (header_length, header, payload);
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string = gst_caps_to_string (caps);
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GST_DEBUG_OBJECT (this, "retrieved GDP caps from packet payload: %s", string);
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2004-06-08 14:24:52 +00:00
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g_free (string);
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2004-05-20 10:15:31 +00:00
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g_free (header);
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g_free (payload);
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2004-06-08 14:24:52 +00:00
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2004-05-20 10:15:31 +00:00
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return caps;
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}
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/* write a GDP header to the socket. Return false if fails. */
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gboolean
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gst_tcp_gdp_write_header (GstElement * this, int socket, GstBuffer * buffer,
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gboolean fatal, const gchar * host, int port)
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{
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guint length;
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guint8 *header;
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size_t wrote;
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if (!gst_dp_header_from_buffer (buffer, 0, &length, &header)) {
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if (fatal)
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GST_ELEMENT_ERROR (this, CORE, TOO_LAZY, (NULL),
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("Could not create GDP header from buffer"));
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return FALSE;
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}
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GST_LOG_OBJECT (this, "writing %d bytes for GDP buffer header", length);
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wrote = gst_tcp_socket_write (socket, header, length);
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2004-06-08 14:24:52 +00:00
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g_free (header);
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2004-05-20 10:15:31 +00:00
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if (wrote != length) {
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if (fatal)
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GST_ELEMENT_ERROR (this, RESOURCE, WRITE,
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(_("Error while sending data to \"%s:%d\"."), host, port),
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("Only %d of %d bytes written: %s",
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wrote, GST_BUFFER_SIZE (buffer), g_strerror (errno)));
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return FALSE;
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}
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return TRUE;
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}
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/* write GDP header and payload to the given socket for the given caps.
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* Return false if fails. */
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gboolean
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gst_tcp_gdp_write_caps (GstElement * this, int socket, const GstCaps * caps,
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gboolean fatal, const char *host, int port)
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{
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guint length;
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guint8 *header;
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guint8 *payload;
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size_t wrote;
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if (!gst_dp_packet_from_caps (caps, 0, &length, &header, &payload)) {
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if (fatal)
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GST_ELEMENT_ERROR (this, CORE, TOO_LAZY, (NULL),
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("Could not create GDP packet from caps"));
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return FALSE;
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}
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GST_LOG_OBJECT (this, "writing %d bytes for GDP caps header", length);
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wrote = gst_tcp_socket_write (socket, header, length);
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if (wrote != length) {
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2004-06-08 14:24:52 +00:00
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g_free (header);
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g_free (payload);
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2004-05-20 10:15:31 +00:00
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if (fatal)
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GST_ELEMENT_ERROR (this, RESOURCE, WRITE,
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(_("Error while sending gdp header data to \"%s:%d\"."), host, port),
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("Only %d of %d bytes written: %s",
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wrote, length, g_strerror (errno)));
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return FALSE;
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}
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length = gst_dp_header_payload_length (header);
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2004-06-08 14:24:52 +00:00
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g_free (header);
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2004-05-20 10:15:31 +00:00
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GST_LOG_OBJECT (this, "writing %d bytes for GDP caps payload", length);
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wrote = gst_tcp_socket_write (socket, payload, length);
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2004-06-08 14:24:52 +00:00
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g_free (payload);
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2004-05-20 10:15:31 +00:00
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if (wrote != length) {
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if (fatal)
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GST_ELEMENT_ERROR (this, RESOURCE, WRITE,
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(_("Error while sending gdp payload data to \"%s:%d\"."), host, port),
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("Only %d of %d bytes written: %s",
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wrote, length, g_strerror (errno)));
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return FALSE;
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}
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return TRUE;
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}
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