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/*****************************************************************************
* message.cpp : SAP Message class
****************************************************************************
* Copyright (C) 1998-2006 the VideoLAN team
* $Id: message.cpp 346 2009-01-11 19:53:25Z courmisch $
*
* Authors: Damien Lucas <nitrox@videolan.org>
* Philippe Van Hecke <philippe.vanhecke@belnet.be>
* Derk-Jan Hartman <hartman at videolan dot org>
* Rémi Denis-Courmont <rem # videolan dot org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <string>
#include <sstream>
#include <vector>
using namespace std;
#include "sapserver.h"
#include "program.h"
#include "message.h"
static const char mime_type[] = "application/sdp";
/*****************************************************************************
* Constructors
*****************************************************************************/
Message::Message(uint16_t v, const char* ip)
{
version = v;
u_long ip_server = inet_addr (ip); //TODO automaticaly get it ?
msg_len = 4
+ 4 /* (IPv4 specific) */
/*+ authentification length (N/A) */
+ sizeof (mime_type);
msg = (uint8_t *)realloc (NULL, msg_len);
if (msg == NULL)
return; // TODO: throw an exception
// Build the Message Header once initialized according to RFC 2974 (SAP)
/* Byte 0 : Version number V1 = 001 (3 bits)
* Address type IPv4/IPv6 = 0/1 (1 bit)
* Reserved 0 (1 bit)
* Message Type ann/del = 0/1 (1 bit)
* Encryption on/off = 0/1 (1 bit)
* Compressed on/off = 0/1 (1 bit) */
msg[0] = 0x20;
//if ( ip_version == SAP_IPV6 ) msg[0] |= 0x10;
//if ( type == SAP_DELETE ) msg[0] |= 0x04;
//if ( encrypted ) msg[0] |= 0x02;
//if ( compressed ) msg[0] |= 0x01;
/* Byte 1 : Authentification length - Not supported */
msg[1] = 0x00;
/* Bytes 2-3 : Message Id Hash */
msg[2] = version & 0xff;
msg[3] = version >> 8;
/* Bytes 4-7 (or 4-19) byte: Originating source */
memcpy (msg + 4, &ip_server, 4);
/* finally MIME type */
memcpy (msg + 8, mime_type, sizeof (mime_type));
}
/*****************************************************************************
* Destructor
*****************************************************************************/
Message::~Message(void)
{
if (msg != NULL)
free (msg);
}
bool Message::AddProgram(Program *p)
{
/* FIXME */
/* RFC 2327 Compliance ? */
string ipv = (p->GetAddress().find(':') == string::npos) ? "IP4" : "IP6";
string sdp = "v=0\r\n"; // SDP version
string ver="";
stringstream ssin(ver);
ssin << version;
ver = ssin.str();
sdp += "o=" + p->GetUser() + " " + ver + " 1 IN " + ipv + " "
+ p->GetMachine() + "\r\n";
sdp += "s=" + p->GetName() + "\r\n";
sdp += "u=" + p->GetSite() + "\r\n";
sdp += "c=IN " + ipv + " " + p->GetAddress();
if (ipv == "IP4")
sdp += "/" + p->GetTTL(); /* only IPv4 multicast shall have a TTL */
sdp += "\r\n";
if (p->IsPermanent())
sdp += "t=0 0\r\n";
else
return false;
/* Session level attributes */
sdp += "a=tool:" + (string)PACKAGE_STRING + "\r\n";
if (p->HasPlGroup())
sdp += "a=x-plgroup:" + p->GetPlGroup() + "\r\n";
/* Media and media-level attributes */
sdp += "a=type:broadcast\r\n";
sdp += "a=charset:UTF-8\r\n";
char portbuf[6];
snprintf(portbuf, sizeof(portbuf), "%u", (unsigned)p->GetPort());
string port = portbuf;
string m = "m=video " + port + " "
+ (p->IsRTP() ? "RTP/AVP 33" : "udp mpeg") +"\r\n";
if (p->IsRTP())
{
m += "a=rtpmap:33 MP2T/90000\r\n";
if (p->IsRTP() & 1)
{
snprintf(portbuf, sizeof(portbuf), "%u", 1 + p->GetPort());
port = portbuf;
m += "a=rtcp:" + port + "\r\n";
}
}
sdp += m;
puts (sdp.c_str ());
if (msg_len + sdp.length () > 1024)
//RFC 2974 Chap 6.
return false;
// updates full message
uint8_t *newmsg = (uint8_t *)realloc (msg, msg_len + sdp.length ());
if (newmsg == NULL)
return false;
// TODO: don't identically overwrite earlier programs
memcpy (newmsg + msg_len, sdp.c_str(), sdp.length ());
msg = newmsg;
msg_len += sdp.length ();
return true;
}
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