gstreamer/gst/rtsp/rtspconnection.c
Wim Taymans 0cbacacba3 gst/rtsp/rtspconnection.c: Don't set a data pointer to NULL and a size > 0 when we deal with empty packets.
Original commit message from CVS:
* gst/rtsp/rtspconnection.c: (read_body):
Don't set a data pointer to NULL and a size > 0 when we deal
with empty packets.
* gst/rtsp/rtspmessage.c: (rtsp_message_new_response),
(rtsp_message_init_response), (rtsp_message_init_data),
(rtsp_message_unset), (rtsp_message_free),
(rtsp_message_take_body):
Check that we can't create invalid empty packets.
2006-11-15 17:44:01 +00:00

784 lines
17 KiB
C

/* 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.
*/
#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 <sys/ioctl.h>
/* we include this here to get the G_OS_* defines */
#include <glib.h>
#ifdef G_OS_WIN32
#include <winsock2.h>
#else
#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 "rtspconnection.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
#define CLOSE_SOCKET(sock) closesocket(sock);
#else
#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
RTSPResult
rtsp_connection_create (RTSPUrl * url, RTSPConnection ** conn)
{
gint ret;
RTSPConnection *newconn;
g_return_val_if_fail (url != NULL, RTSP_EINVAL);
g_return_val_if_fail (conn != NULL, RTSP_EINVAL);
newconn = g_new (RTSPConnection, 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;
#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->cseq = 0;
newconn->session_id[0] = 0;
newconn->state = RTSP_STATE_INIT;
*conn = newconn;
return RTSP_OK;
/* ERRORS */
no_socket_pair:
{
g_free (newconn);
return RTSP_ESYS;
}
}
RTSPResult
rtsp_connection_connect (RTSPConnection * conn)
{
gint fd;
struct sockaddr_in sin;
struct hostent *hostinfo;
char **addrs;
gchar *ip;
struct in_addr addr;
gint ret;
guint16 port;
RTSPUrl *url;
g_return_val_if_fail (conn != NULL, 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 */
addrs = hostinfo->h_addr_list;
ip = inet_ntoa (*(struct in_addr *) *addrs);
}
/* get the port from the url */
rtsp_url_get_port (url, &port);
memset (&sin, 0, sizeof (sin));
sin.sin_family = AF_INET; /* network socket */
sin.sin_port = htons (port); /* on port */
sin.sin_addr.s_addr = inet_addr (ip); /* on host ip */
fd = socket (AF_INET, SOCK_STREAM, 0);
if (fd == -1)
goto sys_error;
ret = connect (fd, (struct sockaddr *) &sin, sizeof (sin));
if (ret != 0)
goto sys_error;
conn->fd = fd;
return RTSP_OK;
sys_error:
{
return RTSP_ESYS;
}
not_resolved:
{
return RTSP_ENET;
}
not_ip:
{
return RTSP_ENOTIP;
}
}
static void
append_header (gint key, gchar * value, GString * str)
{
const gchar *keystr = rtsp_header_as_text (key);
g_string_append_printf (str, "%s: %s\r\n", keystr, value);
}
RTSPResult
rtsp_connection_send (RTSPConnection * conn, RTSPMessage * message)
{
GString *str;
gint towrite;
gchar *data;
g_return_val_if_fail (conn != NULL, RTSP_EINVAL);
g_return_val_if_fail (message != NULL, RTSP_EINVAL);
#ifdef G_OS_WIN32
WSADATA w;
int error = WSAStartup (0x0202, &w);
if (error)
goto startup_error;
if (w.wVersion != 0x0202)
goto version_error;
#endif
str = g_string_new ("");
/* create request string, add CSeq */
g_string_append_printf (str, "%s %s RTSP/1.0\r\n"
"CSeq: %d\r\n",
rtsp_method_as_text (message->type_data.request.method),
message->type_data.request.uri, conn->cseq);
/* append session id if we have one */
if (conn->session_id[0] != '\0') {
rtsp_message_add_header (message, RTSP_HDR_SESSION, conn->session_id);
}
/* append headers */
g_hash_table_foreach (message->hdr_fields, (GHFunc) append_header, 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);
append_header (RTSP_HDR_CONTENT_LENGTH, len, str);
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 */
towrite = str->len;
data = str->str;
while (towrite > 0) {
gint written;
written = write (conn->fd, data, towrite);
if (written < 0) {
if (errno != EAGAIN && errno != EINTR)
goto write_error;
} else {
towrite -= written;
data += written;
}
}
g_string_free (str, TRUE);
conn->cseq++;
return RTSP_OK;
#ifdef G_OS_WIN32
startup_error:
{
g_warning ("Error %d on WSAStartup", error);
return RTSP_EWSASTART;
}
version_error:
{
g_warning ("Windows sockets are not version 0x202 (current 0x%x)",
w.wVersion);
WSACleanup ();
return RTSP_EWSAVERSION;
}
#endif
write_error:
{
g_string_free (str, TRUE);
return RTSP_ESYS;
}
}
static RTSPResult
read_line (gint fd, gchar * buffer, guint size)
{
gint idx;
gchar c;
gint r;
idx = 0;
while (TRUE) {
r = read (fd, &c, 1);
if (r < 1) {
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 RTSP_OK;
read_error:
{
return 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 RTSPResult
parse_response_status (gchar * buffer, RTSPMessage * msg)
{
gchar versionstr[20];
gchar codestr[4];
gint code;
gchar *bptr;
bptr = buffer;
read_string (versionstr, sizeof (versionstr), &bptr);
if (strcmp (versionstr, "RTSP/1.0") != 0)
goto wrong_version;
read_string (codestr, sizeof (codestr), &bptr);
code = atoi (codestr);
while (g_ascii_isspace (*bptr))
bptr++;
rtsp_message_init_response (msg, code, bptr, NULL);
return RTSP_OK;
wrong_version:
{
return RTSP_EINVAL;
}
}
static RTSPResult
parse_request_line (gchar * buffer, RTSPMessage * msg)
{
gchar versionstr[20];
gchar methodstr[20];
gchar urlstr[4096];
gchar *bptr;
RTSPMethod method;
bptr = buffer;
read_string (methodstr, sizeof (methodstr), &bptr);
method = rtsp_find_method (methodstr);
if (method == -1)
goto wrong_method;
read_string (urlstr, sizeof (urlstr), &bptr);
read_string (versionstr, sizeof (versionstr), &bptr);
if (strcmp (versionstr, "RTSP/1.0") != 0)
goto wrong_version;
rtsp_message_init_request (msg, method, urlstr);
return RTSP_OK;
wrong_method:
{
return RTSP_EINVAL;
}
wrong_version:
{
return RTSP_EINVAL;
}
}
/* parsing lines means reading a Key: Value pair */
static RTSPResult
parse_line (gchar * buffer, RTSPMessage * msg)
{
gchar key[32];
gchar *bptr;
RTSPHeaderField field;
bptr = buffer;
/* read key */
read_key (key, sizeof (key), &bptr);
if (*bptr != ':')
return RTSP_EINVAL;
bptr++;
field = rtsp_find_header_field (key);
if (field != -1) {
while (g_ascii_isspace (*bptr))
bptr++;
rtsp_message_add_header (msg, field, bptr);
}
return RTSP_OK;
}
RTSPResult
rtsp_connection_read (RTSPConnection * conn, gpointer data, guint size)
{
fd_set readfds;
guint toread;
gint retval;
gint avail;
g_return_val_if_fail (conn != NULL, RTSP_EINVAL);
g_return_val_if_fail (data != NULL, RTSP_EINVAL);
if (size == 0)
return RTSP_OK;
toread = size;
/* 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 (conn->fd, FIONREAD, &avail) < 0)
avail = 0;
else if (avail >= toread)
goto do_read;
FD_ZERO (&readfds);
FD_SET (conn->fd, &readfds);
FD_SET (READ_SOCKET (conn), &readfds);
while (toread > 0) {
gint bytes;
do {
retval = select (FD_SETSIZE, &readfds, NULL, NULL, NULL);
} while ((retval == -1 && errno == EINTR));
if (retval == -1)
goto select_error;
if (FD_ISSET (READ_SOCKET (conn), &readfds)) {
/* read all stop commands */
while (TRUE) {
gchar command;
int res;
READ_COMMAND (conn, command, res);
if (res <= 0) {
/* no more commands */
break;
}
}
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 = (char *) data + bytes;
}
}
return RTSP_OK;
/* ERRORS */
select_error:
{
return RTSP_ESYS;
}
stopped:
{
return RTSP_EINTR;
}
eof:
{
return RTSP_EEOF;
}
read_error:
{
return RTSP_ESYS;
}
}
static RTSPResult
read_body (RTSPConnection * conn, glong content_length, RTSPMessage * msg)
{
gchar *body;
RTSPResult res;
if (content_length <= 0) {
body = NULL;
content_length = 0;
goto done;
}
body = g_malloc (content_length + 1);
body[content_length] = '\0';
RTSP_CHECK (rtsp_connection_read (conn, body, content_length), read_error);
content_length += 1;
done:
rtsp_message_take_body (msg, (guint8 *) body, content_length);
return RTSP_OK;
/* ERRORS */
read_error:
{
g_free (body);
return res;
}
}
RTSPResult
rtsp_connection_receive (RTSPConnection * conn, RTSPMessage * msg)
{
gchar buffer[4096];
gint line;
gchar *hdrval;
glong content_length;
RTSPResult res;
gboolean need_body;
g_return_val_if_fail (conn != NULL, RTSP_EINVAL);
g_return_val_if_fail (msg != NULL, RTSP_EINVAL);
line = 0;
need_body = TRUE;
res = RTSP_OK;
/* parse first line and headers */
while (res == RTSP_OK) {
gchar c;
/* read first character, this identifies data messages */
RTSP_CHECK (rtsp_connection_read (conn, &c, 1), read_error);
/* check for data packet, first character is $ */
if (c == '$') {
guint16 size;
/* data packets are $<1 byte channel><2 bytes length,BE><data bytes> */
/* read channel, which is the next char */
RTSP_CHECK (rtsp_connection_read (conn, &c, 1), read_error);
/* now we create a data message */
rtsp_message_init_data (msg, (gint) c);
/* next two bytes are the length of the data */
RTSP_CHECK (rtsp_connection_read (conn, &size, 2), read_error);
size = GUINT16_FROM_BE (size);
/* and read the body */
res = read_body (conn, size, msg);
need_body = FALSE;
break;
} else {
gint offset = 0;
/* we have a regular response */
if (c != '\r') {
buffer[0] = c;
offset = 1;
}
/* should not happen */
if (c == '\n')
break;
/* read lines */
RTSP_CHECK (read_line (conn->fd, buffer + offset,
sizeof (buffer) - offset), read_error);
if (buffer[0] == '\0')
break;
if (line == 0) {
/* first line, check for response status */
if (g_str_has_prefix (buffer, "RTSP")) {
res = parse_response_status (buffer, msg);
} else {
res = parse_request_line (buffer, msg);
}
} else {
/* else just parse the line */
parse_line (buffer, msg);
}
}
line++;
}
/* read the rest of the body if needed */
if (need_body) {
/* see if there is a Content-Length header */
if (rtsp_message_get_header (msg, RTSP_HDR_CONTENT_LENGTH,
&hdrval) == RTSP_OK) {
/* there is, read the body */
content_length = atol (hdrval);
RTSP_CHECK (read_body (conn, content_length, msg), read_error);
}
/* save session id in the connection for further use */
{
gchar *session_id;
if (rtsp_message_get_header (msg, RTSP_HDR_SESSION,
&session_id) == RTSP_OK) {
gint sesslen, maxlen, i;
sesslen = strlen (session_id);
maxlen = sizeof (conn->session_id) - 1;
/* the sessionid can have attributes marked with ;
* Make sure we strip them */
for (i = 0; i < sesslen; i++) {
if (session_id[i] == ';')
maxlen = i;
}
/* make sure to not overflow */
strncpy (conn->session_id, session_id, maxlen);
conn->session_id[maxlen] = '\0';
}
}
}
return res;
read_error:
{
return res;
}
}
RTSPResult
rtsp_connection_close (RTSPConnection * conn)
{
gint res;
g_return_val_if_fail (conn != NULL, RTSP_EINVAL);
res = CLOSE_SOCKET (conn->fd);
#ifdef G_OS_WIN32
WSACleanup ();
#endif
conn->fd = -1;
if (res != 0)
goto sys_error;
return RTSP_OK;
sys_error:
{
return RTSP_ESYS;
}
}
RTSPResult
rtsp_connection_free (RTSPConnection * conn)
{
g_return_val_if_fail (conn != NULL, RTSP_EINVAL);
#ifdef G_OS_WIN32
WSACleanup ();
#endif
g_free (conn);
return RTSP_OK;
}
RTSPResult
rtsp_connection_flush (RTSPConnection * conn, gboolean flush)
{
g_return_val_if_fail (conn != NULL, RTSP_EINVAL);
if (flush) {
SEND_COMMAND (conn, CONTROL_STOP);
} else {
while (TRUE) {
gchar command;
int res;
READ_COMMAND (conn, command, res);
if (res <= 0) {
/* no more commands */
break;
}
}
}
return RTSP_OK;
}