gstrtspconnection.c 33.3 KB
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/* GStreamer
 * Copyright (C) <2005,2006> Wim Taymans <wim@fluendo.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
/*
 * Unless otherwise indicated, Source Code is licensed under MIT license.
 * See further explanation attached in License Statement (distributed in the file
 * LICENSE).
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

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/**
 * SECTION:gstrtspconnection
 * @short_description: manage RTSP connections
 * @see_also: gstrtspurl
 *  
 * <refsect2>
 * <para>
 * This object manages the RTSP connection to the server. It provides function
 * to receive and send bytes and messages.
 * </para>
 * </refsect2>
 *  
 * Last reviewed on 2007-07-24 (0.10.14)
 */

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#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <time.h>


/* we include this here to get the G_OS_* defines */
#include <glib.h>
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#include <gst/gst.h>
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#ifdef G_OS_WIN32
#include <winsock2.h>
#define EINPROGRESS WSAEINPROGRESS
#else
#include <sys/ioctl.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif

#ifdef HAVE_FIONREAD_IN_SYS_FILIO
#include <sys/filio.h>
#endif

#include "gstrtspconnection.h"
#include "gstrtspbase64.h"

/* the select call is also performed on the control sockets, that way
 * we can send special commands to unlock or restart the select call */
#define CONTROL_RESTART        'R'      /* restart the select call */
#define CONTROL_STOP           'S'      /* stop the select call */
#define CONTROL_SOCKETS(conn)  conn->control_sock
#define WRITE_SOCKET(conn)     conn->control_sock[1]
#define READ_SOCKET(conn)      conn->control_sock[0]

#define SEND_COMMAND(conn, command)              \
G_STMT_START {                                  \
  unsigned char c; c = command;                 \
  write (WRITE_SOCKET(conn), &c, 1);             \
} G_STMT_END

#define READ_COMMAND(conn, command, res)         \
G_STMT_START {                                  \
  res = read(READ_SOCKET(conn), &command, 1);    \
} G_STMT_END

#ifdef G_OS_WIN32
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#define FIONREAD_TYPE gulong
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#define IOCTL_SOCKET ioctlsocket
#define CLOSE_SOCKET(sock) closesocket(sock);
#else
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#define FIONREAD_TYPE gint
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#define IOCTL_SOCKET ioctl
#define CLOSE_SOCKET(sock) close(sock);
#endif

#ifdef G_OS_WIN32
static int
inet_aton (const char *c, struct in_addr *paddr)
{
  /* note that inet_addr is deprecated on unix because
   * inet_addr returns -1 (INADDR_NONE) for the valid 255.255.255.255
   * address. */
  paddr->s_addr = inet_addr (c);

  if (paddr->s_addr == INADDR_NONE)
    return 0;

  return 1;
}
#endif

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/**
 * gst_rtsp_connection_create:
 * @url: a #GstRTSPUrl 
 * @conn: a #GstRTSPConnection
 *
 * Create a newly allocated #GstRTSPConnection from @url and store it in @conn.
 * The connection will not yet attempt to connect to @url, use
 * gst_rtsp_connection_connect().
 *
 * Returns: #GST_RTSP_OK when @conn contains a valid connection.
 */
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GstRTSPResult
gst_rtsp_connection_create (GstRTSPUrl * url, GstRTSPConnection ** conn)
{
  gint ret;
  GstRTSPConnection *newconn;

#ifdef G_OS_WIN32
  unsigned long flags;
#endif /* G_OS_WIN32 */

  g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);

  newconn = g_new0 (GstRTSPConnection, 1);

#ifdef G_OS_WIN32
  /* This should work on UNIX too. PF_UNIX sockets replaced with pipe */
  /* pipe( CONTROL_SOCKETS(newconn) ) */
  if ((ret = pipe (CONTROL_SOCKETS (newconn))) < 0)
    goto no_socket_pair;

  ioctlsocket (READ_SOCKET (newconn), FIONBIO, &flags);
  ioctlsocket (WRITE_SOCKET (newconn), FIONBIO, &flags);
#else
  if ((ret =
          socketpair (PF_UNIX, SOCK_STREAM, 0, CONTROL_SOCKETS (newconn))) < 0)
    goto no_socket_pair;

  fcntl (READ_SOCKET (newconn), F_SETFL, O_NONBLOCK);
  fcntl (WRITE_SOCKET (newconn), F_SETFL, O_NONBLOCK);
#endif

  newconn->url = url;
  newconn->fd = -1;
  newconn->timer = g_timer_new ();

  newconn->auth_method = GST_RTSP_AUTH_NONE;
  newconn->username = NULL;
  newconn->passwd = NULL;

  *conn = newconn;

  return GST_RTSP_OK;

  /* ERRORS */
no_socket_pair:
  {
    g_free (newconn);
    return GST_RTSP_ESYS;
  }
}

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/**
 * gst_rtsp_connection_connect:
 * @conn: a #GstRTSPConnection 
 * @timeout: a #GTimeVal timeout
 *
 * Attempt to connect to the url of @conn made with
 * gst_rtsp_connection_create(). If @timeout is #NULL this function can block
 * forever. If @timeout contains a valid timeout, this function will return
 * #GST_RTSP_ETIMEOUT after the timeout expired.
 *
 * Returns: #GST_RTSP_OK when a connection could be made.
 */
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GstRTSPResult
gst_rtsp_connection_connect (GstRTSPConnection * conn, GTimeVal * timeout)
{
  gint fd;
  struct sockaddr_in sa_in;
  struct hostent *hostinfo;
  const gchar *ip;
  struct in_addr addr;
  gint ret;
  guint16 port;
  GstRTSPUrl *url;
  fd_set writefds;
  fd_set readfds;
  struct timeval tv, *tvp;
  gint max_fd, retval;

#ifdef G_OS_WIN32
  unsigned long flags;
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  struct in_addr *addrp;
#else
  char **addrs;
  gchar ipbuf[INET_ADDRSTRLEN];
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#endif /* G_OS_WIN32 */

  g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
  g_return_val_if_fail (conn->url != NULL, GST_RTSP_EINVAL);
  g_return_val_if_fail (conn->fd < 0, GST_RTSP_EINVAL);

  url = conn->url;

  /* first check if it already is an IP address */
  if (inet_aton (url->host, &addr)) {
    ip = url->host;
  } else {
    hostinfo = gethostbyname (url->host);
    if (!hostinfo)
      goto not_resolved;        /* h_errno set */

    if (hostinfo->h_addrtype != AF_INET)
      goto not_ip;              /* host not an IP host */
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#ifdef G_OS_WIN32
    addrp = (struct in_addr *) hostinfo->h_addr_list[0];
    /* this is not threadsafe */
    ip = inet_ntoa (*addrp);
#else
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    addrs = hostinfo->h_addr_list;
    ip = inet_ntop (AF_INET, (struct in_addr *) addrs[0], ipbuf,
        sizeof (ipbuf));
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#endif /* G_OS_WIN32 */
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  }

  /* get the port from the url */
  gst_rtsp_url_get_port (url, &port);

  memset (&sa_in, 0, sizeof (sa_in));
  sa_in.sin_family = AF_INET;   /* network socket */
  sa_in.sin_port = htons (port);        /* on port */
  sa_in.sin_addr.s_addr = inet_addr (ip);       /* on host ip */

  fd = socket (AF_INET, SOCK_STREAM, 0);
  if (fd == -1)
    goto sys_error;

  /* set to non-blocking mode so that we can cancel the connect */
#ifndef G_OS_WIN32
  fcntl (fd, F_SETFL, O_NONBLOCK);
#else
  ioctlsocket (fd, FIONBIO, &flags);
#endif /* G_OS_WIN32 */

  /* we are going to connect ASYNC now */
  ret = connect (fd, (struct sockaddr *) &sa_in, sizeof (sa_in));
  if (ret == 0)
    goto done;
  if (errno != EINPROGRESS)
    goto sys_error;

  /* wait for connect to complete up to the specified timeout or until we got
   * interrupted. */
  FD_ZERO (&writefds);
  FD_SET (fd, &writefds);
  FD_ZERO (&readfds);
  FD_SET (READ_SOCKET (conn), &readfds);

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  if (timeout) {
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    tv.tv_sec = timeout->tv_sec;
    tv.tv_usec = timeout->tv_usec;
    tvp = &tv;
  } else {
    tvp = NULL;
  }

  max_fd = MAX (fd, READ_SOCKET (conn));

  do {
    retval = select (max_fd + 1, &readfds, &writefds, NULL, tvp);
  } while ((retval == -1 && errno == EINTR));

  if (retval == 0)
    goto timeout;
  else if (retval == -1)
    goto sys_error;

done:
  conn->fd = fd;
  conn->ip = g_strdup (ip);

  return GST_RTSP_OK;

sys_error:
  {
    if (fd != -1)
      CLOSE_SOCKET (fd);
    return GST_RTSP_ESYS;
  }
not_resolved:
  {
    return GST_RTSP_ENET;
  }
not_ip:
  {
    return GST_RTSP_ENOTIP;
  }
timeout:
  {
    return GST_RTSP_ETIMEOUT;
  }
}

static void
add_auth_header (GstRTSPConnection * conn, GstRTSPMessage * message)
{
  switch (conn->auth_method) {
    case GST_RTSP_AUTH_BASIC:{
      gchar *user_pass =
          g_strdup_printf ("%s:%s", conn->username, conn->passwd);
      gchar *user_pass64 =
          gst_rtsp_base64_encode (user_pass, strlen (user_pass));
      gchar *auth_string = g_strdup_printf ("Basic %s", user_pass64);

      gst_rtsp_message_add_header (message, GST_RTSP_HDR_AUTHORIZATION,
          auth_string);

      g_free (user_pass);
      g_free (user_pass64);
      g_free (auth_string);
      break;
    }
    default:
      /* Nothing to do */
      break;
  }
}

static void
add_date_header (GstRTSPMessage * message)
{
  GTimeVal tv;
  gchar date_string[100];

  g_get_current_time (&tv);
  strftime (date_string, sizeof (date_string), "%a, %d %b %Y %H:%M:%S GMT",
      gmtime (&tv.tv_sec));

  gst_rtsp_message_add_header (message, GST_RTSP_HDR_DATE, date_string);
}

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/**
 * gst_rtsp_connection_write:
 * @conn: a #GstRTSPConnection
 * @data: the data to write
 * @size: the size of @data
 * @timeout: a timeout value or #NULL
 *
 * Attempt to write @size bytes of @data to the connected @conn, blocking up to
 * the specified @timeout. @timeout can be #NULL, in which case this function
 * might block forever.
 * 
 * This function can be canceled with gst_rtsp_connection_flush().
 *
 * Returns: #GST_RTSP_OK on success.
 */
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GstRTSPResult
gst_rtsp_connection_write (GstRTSPConnection * conn, const guint8 * data,
    guint size, GTimeVal * timeout)
{
  guint towrite;
  fd_set writefds;
  fd_set readfds;
  int max_fd;
  gint retval;
  struct timeval tv, *tvp;

  g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
  g_return_val_if_fail (data != NULL || size == 0, GST_RTSP_EINVAL);

  FD_ZERO (&writefds);
  FD_SET (conn->fd, &writefds);
  FD_ZERO (&readfds);

  max_fd = MAX (conn->fd, READ_SOCKET (conn));

  if (timeout) {
    tv.tv_sec = timeout->tv_sec;
    tv.tv_usec = timeout->tv_usec;
    tvp = &tv;
  } else {
    tvp = NULL;
  }

  towrite = size;

  while (towrite > 0) {
    gint written;

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    /* set bit inside the loop for when we loop to read the rest of the data */
    FD_SET (READ_SOCKET (conn), &readfds);

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    do {
      retval = select (max_fd + 1, &readfds, &writefds, NULL, tvp);
    } while ((retval == -1 && errno == EINTR));

    if (retval == 0)
      goto timeout;

    if (retval == -1)
      goto select_error;

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    if (FD_ISSET (READ_SOCKET (conn), &readfds))
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      goto stopped;

    /* now we can write */
    written = write (conn->fd, data, towrite);
    if (written < 0) {
      if (errno != EAGAIN && errno != EINTR)
        goto write_error;
    } else {
      towrite -= written;
      data += written;
    }
  }
  return GST_RTSP_OK;

  /* ERRORS */
timeout:
  {
    return GST_RTSP_ETIMEOUT;
  }
select_error:
  {
    return GST_RTSP_ESYS;
  }
stopped:
  {
    return GST_RTSP_EINTR;
  }
write_error:
  {
    return GST_RTSP_ESYS;
  }
}

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/**
 * gst_rtsp_connection_send:
 * @conn: a #GstRTSPConnection
 * @message: the message to send
 * @timeout: a timeout value or #NULL
 *
 * Attempt to send @message to the connected @conn, blocking up to
 * the specified @timeout. @timeout can be #NULL, in which case this function
 * might block forever.
 * 
 * This function can be canceled with gst_rtsp_connection_flush().
 *
 * Returns: #GST_RTSP_OK on success.
 */
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GstRTSPResult
gst_rtsp_connection_send (GstRTSPConnection * conn, GstRTSPMessage * message,
    GTimeVal * timeout)
{
  GString *str = NULL;
  GstRTSPResult res;

#ifdef G_OS_WIN32
  WSADATA w;
  int error;
#endif

  g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
  g_return_val_if_fail (message != NULL, GST_RTSP_EINVAL);

#ifdef G_OS_WIN32
  error = WSAStartup (0x0202, &w);

  if (error)
    goto startup_error;

  if (w.wVersion != 0x0202)
    goto version_error;
#endif

  str = g_string_new ("");

  switch (message->type) {
    case GST_RTSP_MESSAGE_REQUEST:
      /* create request string, add CSeq */
      g_string_append_printf (str, "%s %s RTSP/1.0\r\n"
          "CSeq: %d\r\n",
          gst_rtsp_method_as_text (message->type_data.request.method),
          message->type_data.request.uri, conn->cseq++);
      /* add session id if we have one */
      if (conn->session_id[0] != '\0') {
        gst_rtsp_message_add_header (message, GST_RTSP_HDR_SESSION,
            conn->session_id);
      }
      /* add any authentication headers */
      add_auth_header (conn, message);
      break;
    case GST_RTSP_MESSAGE_RESPONSE:
      /* create response string */
      g_string_append_printf (str, "RTSP/1.0 %d %s\r\n",
          message->type_data.response.code, message->type_data.response.reason);
      break;
    case GST_RTSP_MESSAGE_DATA:
    {
      guint8 data_header[4];

      /* prepare data header */
      data_header[0] = '$';
      data_header[1] = message->type_data.data.channel;
      data_header[2] = (message->body_size >> 8) & 0xff;
      data_header[3] = message->body_size & 0xff;

      /* create string with header and data */
      str = g_string_append_len (str, (gchar *) data_header, 4);
      str =
          g_string_append_len (str, (gchar *) message->body,
          message->body_size);
      break;
    }
    default:
      g_assert_not_reached ();
      break;
  }

  /* append headers and body */
  if (message->type != GST_RTSP_MESSAGE_DATA) {
    /* add date header */
    add_date_header (message);

    /* append headers */
    gst_rtsp_message_append_headers (message, str);

    /* append Content-Length and body if needed */
    if (message->body != NULL && message->body_size > 0) {
      gchar *len;

      len = g_strdup_printf ("%d", message->body_size);
      g_string_append_printf (str, "%s: %s\r\n",
          gst_rtsp_header_as_text (GST_RTSP_HDR_CONTENT_LENGTH), len);
      g_free (len);
      /* header ends here */
      g_string_append (str, "\r\n");
      str =
          g_string_append_len (str, (gchar *) message->body,
          message->body_size);
    } else {
      /* just end headers */
      g_string_append (str, "\r\n");
    }
  }

  /* write request */
  res =
      gst_rtsp_connection_write (conn, (guint8 *) str->str, str->len, timeout);

  g_string_free (str, TRUE);

  return res;

#ifdef G_OS_WIN32
startup_error:
  {
    g_warning ("Error %d on WSAStartup", error);
    return GST_RTSP_EWSASTART;
  }
version_error:
  {
    g_warning ("Windows sockets are not version 0x202 (current 0x%x)",
        w.wVersion);
    WSACleanup ();
    return GST_RTSP_EWSAVERSION;
  }
#endif
}

static GstRTSPResult
read_line (gint fd, gchar * buffer, guint size)
{
  guint idx;
  gchar c;
  gint r;

  idx = 0;
  while (TRUE) {
    r = read (fd, &c, 1);
    if (r == 0) {
      goto eof;
    } else if (r < 0) {
      if (errno != EAGAIN && errno != EINTR)
        goto read_error;
    } else {
      if (c == '\n')            /* end on \n */
        break;
      if (c == '\r')            /* ignore \r */
        continue;

      if (idx < size - 1)
        buffer[idx++] = c;
    }
  }
  buffer[idx] = '\0';

  return GST_RTSP_OK;

eof:
  {
    return GST_RTSP_EEOF;
  }
read_error:
  {
    return GST_RTSP_ESYS;
  }
}

static void
read_string (gchar * dest, gint size, gchar ** src)
{
  gint idx;

  idx = 0;
  /* skip spaces */
  while (g_ascii_isspace (**src))
    (*src)++;

  while (!g_ascii_isspace (**src) && **src != '\0') {
    if (idx < size - 1)
      dest[idx++] = **src;
    (*src)++;
  }
  if (size > 0)
    dest[idx] = '\0';
}

static void
read_key (gchar * dest, gint size, gchar ** src)
{
  gint idx;

  idx = 0;
  while (**src != ':' && **src != '\0') {
    if (idx < size - 1)
      dest[idx++] = **src;
    (*src)++;
  }
  if (size > 0)
    dest[idx] = '\0';
}

static GstRTSPResult
parse_response_status (gchar * buffer, GstRTSPMessage * msg)
{
  GstRTSPResult res;
  gchar versionstr[20];
  gchar codestr[4];
  gint code;
  gchar *bptr;

  bptr = buffer;

  read_string (versionstr, sizeof (versionstr), &bptr);
  read_string (codestr, sizeof (codestr), &bptr);
  code = atoi (codestr);

  while (g_ascii_isspace (*bptr))
    bptr++;

  if (strcmp (versionstr, "RTSP/1.0") == 0)
    GST_RTSP_CHECK (gst_rtsp_message_init_response (msg, code, bptr, NULL),
        parse_error);
  else if (strncmp (versionstr, "RTSP/", 5) == 0) {
    GST_RTSP_CHECK (gst_rtsp_message_init_response (msg, code, bptr, NULL),
        parse_error);
    msg->type_data.response.version = GST_RTSP_VERSION_INVALID;
  } else
    goto parse_error;

  return GST_RTSP_OK;

parse_error:
  {
    return GST_RTSP_EPARSE;
  }
}

static GstRTSPResult
parse_request_line (gchar * buffer, GstRTSPMessage * msg)
{
  GstRTSPResult res = GST_RTSP_OK;
  gchar versionstr[20];
  gchar methodstr[20];
  gchar urlstr[4096];
  gchar *bptr;
  GstRTSPMethod method;

  bptr = buffer;

  read_string (methodstr, sizeof (methodstr), &bptr);
  method = gst_rtsp_find_method (methodstr);

  read_string (urlstr, sizeof (urlstr), &bptr);
  if (*urlstr == '\0')
    res = GST_RTSP_EPARSE;

  read_string (versionstr, sizeof (versionstr), &bptr);

  if (*bptr != '\0')
    res = GST_RTSP_EPARSE;

  if (strcmp (versionstr, "RTSP/1.0") == 0) {
    if (gst_rtsp_message_init_request (msg, method, urlstr) != GST_RTSP_OK)
      res = GST_RTSP_EPARSE;
  } else if (strncmp (versionstr, "RTSP/", 5) == 0) {
    if (gst_rtsp_message_init_request (msg, method, urlstr) != GST_RTSP_OK)
      res = GST_RTSP_EPARSE;
    msg->type_data.request.version = GST_RTSP_VERSION_INVALID;
  } else {
    gst_rtsp_message_init_request (msg, method, urlstr);
    msg->type_data.request.version = GST_RTSP_VERSION_INVALID;
    res = GST_RTSP_EPARSE;
  }

  return res;
}

/* parsing lines means reading a Key: Value pair */
static GstRTSPResult
parse_line (gchar * buffer, GstRTSPMessage * msg)
{
  gchar key[32];
  gchar *bptr;
  GstRTSPHeaderField field;

  bptr = buffer;

  /* read key */
  read_key (key, sizeof (key), &bptr);
  if (*bptr != ':')
    goto no_column;

  bptr++;

  field = gst_rtsp_find_header_field (key);
  if (field != GST_RTSP_HDR_INVALID) {
    while (g_ascii_isspace (*bptr))
      bptr++;
    gst_rtsp_message_add_header (msg, field, bptr);
  }

  return GST_RTSP_OK;

no_column:
  {
    return GST_RTSP_EPARSE;
  }
}

789
/**
790
 * gst_rtsp_connection_read_internal:
791
792
793
794
 * @conn: a #GstRTSPConnection
 * @data: the data to read
 * @size: the size of @data
 * @timeout: a timeout value or #NULL
795
 * @allow_interrupt: can the pending read be interrupted
796
797
798
799
800
 *
 * Attempt to read @size bytes into @data from the connected @conn, blocking up to
 * the specified @timeout. @timeout can be #NULL, in which case this function
 * might block forever.
 * 
801
802
 * This function can be canceled with gst_rtsp_connection_flush() only if the
 * @allow_interrupt is set.
803
804
805
 *
 * Returns: #GST_RTSP_OK on success.
 */
806
807
808
static GstRTSPResult
gst_rtsp_connection_read_internal (GstRTSPConnection * conn, guint8 * data,
    guint size, GTimeVal * timeout, gboolean allow_interrupt)
809
810
811
812
{
  fd_set readfds;
  guint toread;
  gint retval;
813
814
  struct timeval tv_timeout, *ptv_timeout;
  FIONREAD_TYPE avail;
815
816
817
818
819
820
821
822
823

  g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
  g_return_val_if_fail (data != NULL, GST_RTSP_EINVAL);

  if (size == 0)
    return GST_RTSP_OK;

  toread = size;

824
825
826
827
828
829
830
831
  /* configure timeout if any */
  if (timeout != NULL) {
    tv_timeout.tv_sec = timeout->tv_sec;
    tv_timeout.tv_usec = timeout->tv_usec;
    ptv_timeout = &tv_timeout;
  } else
    ptv_timeout = NULL;

832
833
834
835
836
837
838
839
840
841
842
843
844
  /* if the call fails, just go in the select.. it should not fail. Else if
   * there is enough data to read, skip the select call al together.*/
  if (IOCTL_SOCKET (conn->fd, FIONREAD, &avail) < 0)
    avail = 0;
  else if (avail >= toread)
    goto do_read;

  FD_ZERO (&readfds);
  FD_SET (conn->fd, &readfds);

  while (toread > 0) {
    gint bytes;

845
846
    /* set inside the loop so that when we did not read enough and we have to
     * continue, we still have the cancel socket bit set */
847
848
    if (allow_interrupt)
      FD_SET (READ_SOCKET (conn), &readfds);
849

850
851
852
853
854
855
856
857
858
859
860
    do {
      retval = select (FD_SETSIZE, &readfds, NULL, NULL, ptv_timeout);
    } while ((retval == -1 && errno == EINTR));

    if (retval == -1)
      goto select_error;

    /* check for timeout */
    if (retval == 0)
      goto select_timeout;

861
    if (FD_ISSET (READ_SOCKET (conn), &readfds))
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
      goto stopped;

  do_read:
    /* if we get here there is activity on the real fd since the select
     * completed and the control socket was not readable. */
    bytes = read (conn->fd, data, toread);

    if (bytes == 0) {
      goto eof;
    } else if (bytes < 0) {
      if (errno != EAGAIN && errno != EINTR)
        goto read_error;
    } else {
      toread -= bytes;
      data += bytes;
    }
  }
  return GST_RTSP_OK;

  /* ERRORS */
select_error:
  {
    return GST_RTSP_ESYS;
  }
select_timeout:
  {
    return GST_RTSP_ETIMEOUT;
  }
stopped:
  {
    return GST_RTSP_EINTR;
  }
eof:
  {
    return GST_RTSP_EEOF;
  }
read_error:
  {
    return GST_RTSP_ESYS;
  }
}

904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
/**
 * gst_rtsp_connection_read:
 * @conn: a #GstRTSPConnection
 * @data: the data to read
 * @size: the size of @data
 * @timeout: a timeout value or #NULL
 *
 * Attempt to read @size bytes into @data from the connected @conn, blocking up to
 * the specified @timeout. @timeout can be #NULL, in which case this function
 * might block forever.
 *
 * This function can be canceled with gst_rtsp_connection_flush().
 *
 * Returns: #GST_RTSP_OK on success.
 */
GstRTSPResult
gst_rtsp_connection_read (GstRTSPConnection * conn, guint8 * data, guint size,
    GTimeVal * timeout)
{
  return gst_rtsp_connection_read_internal (conn, data, size, timeout, TRUE);
}


927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
static GstRTSPResult
read_body (GstRTSPConnection * conn, glong content_length, GstRTSPMessage * msg,
    GTimeVal * timeout)
{
  guint8 *body;
  GstRTSPResult res;

  if (content_length <= 0) {
    body = NULL;
    content_length = 0;
    goto done;
  }

  body = g_malloc (content_length + 1);
  body[content_length] = '\0';

943
944
  GST_RTSP_CHECK (gst_rtsp_connection_read_internal (conn, body, content_length,
          timeout, FALSE), read_error);
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960

  content_length += 1;

done:
  gst_rtsp_message_take_body (msg, (guint8 *) body, content_length);

  return GST_RTSP_OK;

  /* ERRORS */
read_error:
  {
    g_free (body);
    return res;
  }
}

961
962
963
964
965
966
967
968
969
970
971
972
973
974
/**
 * gst_rtsp_connection_receive:
 * @conn: a #GstRTSPConnection
 * @message: the message to read
 * @timeout: a timeout value or #NULL
 *
 * Attempt to read into @message from the connected @conn, blocking up to
 * the specified @timeout. @timeout can be #NULL, in which case this function
 * might block forever.
 * 
 * This function can be canceled with gst_rtsp_connection_flush().
 *
 * Returns: #GST_RTSP_OK on success.
 */
975
GstRTSPResult
976
gst_rtsp_connection_receive (GstRTSPConnection * conn, GstRTSPMessage * message,
977
978
979
980
981
982
983
984
985
    GTimeVal * timeout)
{
  gchar buffer[4096];
  gint line;
  glong content_length;
  GstRTSPResult res;
  gboolean need_body;

  g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
986
  g_return_val_if_fail (message != NULL, GST_RTSP_EINVAL);
987
988
989
990
991
992
993
994
995
996
997

  line = 0;

  need_body = TRUE;

  res = GST_RTSP_OK;
  /* parse first line and headers */
  while (res == GST_RTSP_OK) {
    guint8 c;

    /* read first character, this identifies data messages */
998
999
1000
    /* This is the only read() that we allow to be interrupted */
    GST_RTSP_CHECK (gst_rtsp_connection_read_internal (conn, &c, 1, timeout,
            TRUE), read_error);
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