/*

 This file is a part of JRTPLIB
 Copyright (c) 1999-2017 Jori Liesenborgs

 Contact: jori.liesenborgs@gmail.com

 This library was developed at the Expertise Centre for Digital Media
 (http://www.edm.uhasselt.be), a research center of the Hasselt University
 (http://www.uhasselt.be). The library is based upon work done for
 my thesis at the School for Knowledge Technology (Belgium/The Netherlands).

 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.

 */

#include "rtpudpv4transmitter.h"
#include "rtprawpacket.h"
#include "rtpipv4address.h"
#include "rtptimeutilities.h"
#include "rtpdefines.h"
#include "rtpstructs.h"
#include "rtpsocketutilinternal.h"
#include "rtpinternalutils.h"
#include "rtpselect.h"
#include <stdio.h>
#include <assert.h>
#include <vector>

#include <iostream>

using namespace std;

#define RTPUDPV4TRANS_MAXPACKSIZE							65535
#define RTPUDPV4TRANS_IFREQBUFSIZE							8192

#define RTPUDPV4TRANS_IS_MCASTADDR(x)							(((x)&0xF0000000) == 0xE0000000)

#define RTPUDPV4TRANS_MCASTMEMBERSHIP(socket,type,mcastip,status)	{\
										struct ip_mreq mreq;\
										\
										mreq.imr_multiaddr.s_addr = htonl(mcastip);\
										mreq.imr_interface.s_addr = htonl(mcastifaceIP);\
										status = setsockopt(socket,IPPROTO_IP,type,(const char *)&mreq,sizeof(struct ip_mreq));\
									}
#define MAINMUTEX_LOCK
#define MAINMUTEX_UNLOCK
#define WAITMUTEX_LOCK
#define WAITMUTEX_UNLOCK

#define CLOSESOCKETS do { \
	if (closesocketswhendone) \
	{\
		if (rtpsock != rtcpsock) \
			RTPCLOSE(rtcpsock); \
		RTPCLOSE(rtpsock); \
	} \
} while(0)

namespace qrtplib
{

RTPUDPv4Transmitter::RTPUDPv4Transmitter()
{
    created = false;
    init = false;
}

RTPUDPv4Transmitter::~RTPUDPv4Transmitter()
{
    Destroy();
}

int RTPUDPv4Transmitter::Init(bool tsafe)
{
    if (init)
        return ERR_RTP_UDPV4TRANS_ALREADYINIT;

    if (tsafe)
        return ERR_RTP_NOTHREADSUPPORT;

    init = true;
    return 0;
}

int RTPUDPv4Transmitter::GetIPv4SocketPort(SocketType s, uint16_t *pPort)
{
    assert(pPort != 0);

    struct sockaddr_in addr;
    memset(&addr, 0, sizeof(struct sockaddr_in));

    RTPSOCKLENTYPE size = sizeof(struct sockaddr_in);
    if (getsockname(s, (struct sockaddr*) &addr, &size) != 0)
        return ERR_RTP_UDPV4TRANS_CANTGETSOCKETPORT;

    if (addr.sin_family != AF_INET)
        return ERR_RTP_UDPV4TRANS_NOTANIPV4SOCKET;

    uint16_t port = ntohs(addr.sin_port);
    if (port == 0)
        return ERR_RTP_UDPV4TRANS_SOCKETPORTNOTSET;

    int type = 0;
    RTPSOCKLENTYPE length = sizeof(type);

    if (getsockopt(s, SOL_SOCKET, SO_TYPE, (char*) &type, &length) != 0)
        return ERR_RTP_UDPV4TRANS_CANTGETSOCKETTYPE;

    if (type != SOCK_DGRAM)
        return ERR_RTP_UDPV4TRANS_INVALIDSOCKETTYPE;

    *pPort = port;
    return 0;
}

int RTPUDPv4Transmitter::GetAutoSockets(uint32_t bindIP, bool allowOdd, bool rtcpMux, SocketType *pRtpSock, SocketType *pRtcpSock, uint16_t *pRtpPort, uint16_t *pRtcpPort)
{
    const int maxAttempts = 1024;
    int attempts = 0;
    vector<SocketType> toClose;

    while (attempts++ < maxAttempts)
    {
        SocketType sock = socket(PF_INET, SOCK_DGRAM, 0);
        if (sock == RTPSOCKERR)
        {
            for (size_t i = 0; i < toClose.size(); i++)
                RTPCLOSE(toClose[i]);
            return ERR_RTP_UDPV4TRANS_CANTCREATESOCKET;
        }

        // First we get an automatically chosen port

        struct sockaddr_in addr;
        memset(&addr, 0, sizeof(struct sockaddr_in));

        addr.sin_family = AF_INET;
        addr.sin_port = 0;
        addr.sin_addr.s_addr = htonl(bindIP);
        if (bind(sock, (struct sockaddr *) &addr, sizeof(struct sockaddr_in)) != 0)
        {
            RTPCLOSE(sock);
            for (size_t i = 0; i < toClose.size(); i++)
                RTPCLOSE(toClose[i]);
            return ERR_RTP_UDPV4TRANS_CANTGETVALIDSOCKET;
        }

        uint16_t basePort = 0;
        int status = GetIPv4SocketPort(sock, &basePort);
        if (status < 0)
        {
            RTPCLOSE(sock);
            for (size_t i = 0; i < toClose.size(); i++)
                RTPCLOSE(toClose[i]);
            return status;
        }

        if (rtcpMux) // only need one socket
        {
            if (basePort % 2 == 0 || allowOdd)
            {
                *pRtpSock = sock;
                *pRtcpSock = sock;
                *pRtpPort = basePort;
                *pRtcpPort = basePort;
                for (size_t i = 0; i < toClose.size(); i++)
                    RTPCLOSE(toClose[i]);

                return 0;
            }
            else
                toClose.push_back(sock);
        }
        else
        {
            SocketType sock2 = socket(PF_INET, SOCK_DGRAM, 0);
            if (sock2 == RTPSOCKERR)
            {
                RTPCLOSE(sock);
                for (size_t i = 0; i < toClose.size(); i++)
                    RTPCLOSE(toClose[i]);
                return ERR_RTP_UDPV4TRANS_CANTCREATESOCKET;
            }

            // Try the next port or the previous port
            uint16_t secondPort = basePort;
            bool possiblyValid = false;

            if (basePort % 2 == 0)
            {
                secondPort++;
                possiblyValid = true;
            }
            else if (basePort > 1) // avoid landing on port 0
            {
                secondPort--;
                possiblyValid = true;
            }

            if (possiblyValid)
            {
                memset(&addr, 0, sizeof(struct sockaddr_in));

                addr.sin_family = AF_INET;
                addr.sin_port = htons(secondPort);
                addr.sin_addr.s_addr = htonl(bindIP);
                if (bind(sock2, (struct sockaddr *) &addr, sizeof(struct sockaddr_in)) == 0)
                {
                    // In this case, we have two consecutive port numbers, the lower of
                    // which is even

                    if (basePort < secondPort)
                    {
                        *pRtpSock = sock;
                        *pRtcpSock = sock2;
                        *pRtpPort = basePort;
                        *pRtcpPort = secondPort;
                    }
                    else
                    {
                        *pRtpSock = sock2;
                        *pRtcpSock = sock;
                        *pRtpPort = secondPort;
                        *pRtcpPort = basePort;
                    }

                    for (size_t i = 0; i < toClose.size(); i++)
                        RTPCLOSE(toClose[i]);

                    return 0;
                }
            }

            toClose.push_back(sock);
            toClose.push_back(sock2);
        }
    }

    for (size_t i = 0; i < toClose.size(); i++)
        RTPCLOSE(toClose[i]);

    return ERR_RTP_UDPV4TRANS_TOOMANYATTEMPTSCHOOSINGSOCKET;
}

int RTPUDPv4Transmitter::Create(size_t maximumpacketsize, const RTPTransmissionParams *transparams)
{
    const RTPUDPv4TransmissionParams *params, defaultparams;
    struct sockaddr_in addr;
    RTPSOCKLENTYPE size;
    int status;

    if (!init)
        return ERR_RTP_UDPV4TRANS_NOTINIT;

    MAINMUTEX_LOCK

    if (created)
    {
        MAINMUTEX_UNLOCK
        return ERR_RTP_UDPV4TRANS_ALREADYCREATED;
    }

    // Obtain transmission parameters

    if (transparams == 0)
        params = &defaultparams;
    else
    {
        if (transparams->GetTransmissionProtocol() != RTPTransmitter::IPv4UDPProto)
        {
            MAINMUTEX_UNLOCK
            return ERR_RTP_UDPV4TRANS_ILLEGALPARAMETERS;
        }
        params = (const RTPUDPv4TransmissionParams *) transparams;
    }

    if (params->GetUseExistingSockets(rtpsock, rtcpsock))
    {
        closesocketswhendone = false;

        // Determine the port numbers
        int status = GetIPv4SocketPort(rtpsock, &m_rtpPort);
        if (status < 0)
        {
            MAINMUTEX_UNLOCK
            return status;
        }
        status = GetIPv4SocketPort(rtcpsock, &m_rtcpPort);
        if (status < 0)
        {
            MAINMUTEX_UNLOCK
            return status;
        }
    }
    else
    {
        closesocketswhendone = true;

        if (params->GetPortbase() == 0)
        {
            int status = GetAutoSockets(params->GetBindIP(), params->GetAllowOddPortbase(), params->GetRTCPMultiplexing(), &rtpsock, &rtcpsock, &m_rtpPort, &m_rtcpPort);
            if (status < 0)
            {
                MAINMUTEX_UNLOCK
                return status;
            }
        }
        else
        {
            // Check if portbase is even (if necessary)
            if (!params->GetAllowOddPortbase() && params->GetPortbase() % 2 != 0)
            {
                MAINMUTEX_UNLOCK
                return ERR_RTP_UDPV4TRANS_PORTBASENOTEVEN;
            }

            // create sockets

            rtpsock = socket(PF_INET, SOCK_DGRAM, 0);
            if (rtpsock == RTPSOCKERR)
            {
                MAINMUTEX_UNLOCK
                return ERR_RTP_UDPV4TRANS_CANTCREATESOCKET;
            }

            // If we're multiplexing, we're just going to set the RTCP socket to equal the RTP socket
            if (params->GetRTCPMultiplexing())
                rtcpsock = rtpsock;
            else
            {
                rtcpsock = socket(PF_INET, SOCK_DGRAM, 0);
                if (rtcpsock == RTPSOCKERR)
                {
                    RTPCLOSE(rtpsock);
                    MAINMUTEX_UNLOCK
                    return ERR_RTP_UDPV4TRANS_CANTCREATESOCKET;
                }
            }

            // bind sockets

            uint32_t bindIP = params->GetBindIP();

            m_rtpPort = params->GetPortbase();

            memset(&addr, 0, sizeof(struct sockaddr_in));
            addr.sin_family = AF_INET;
            addr.sin_port = htons(params->GetPortbase());
            addr.sin_addr.s_addr = htonl(bindIP);
            if (bind(rtpsock, (struct sockaddr *) &addr, sizeof(struct sockaddr_in)) != 0)
            {
                CLOSESOCKETS;
                MAINMUTEX_UNLOCK
                return ERR_RTP_UDPV4TRANS_CANTBINDRTPSOCKET;
            }

            if (rtpsock != rtcpsock) // no need to bind same socket twice when multiplexing
            {
                uint16_t rtpport = params->GetPortbase();
                uint16_t rtcpport = params->GetForcedRTCPPort();

                if (rtcpport == 0)
                {
                    rtcpport = rtpport;
                    if (rtcpport < 0xFFFF)
                        rtcpport++;
                }

                memset(&addr, 0, sizeof(struct sockaddr_in));
                addr.sin_family = AF_INET;
                addr.sin_port = htons(rtcpport);
                addr.sin_addr.s_addr = htonl(bindIP);
                if (bind(rtcpsock, (struct sockaddr *) &addr, sizeof(struct sockaddr_in)) != 0)
                {
                    CLOSESOCKETS;
                    MAINMUTEX_UNLOCK
                    return ERR_RTP_UDPV4TRANS_CANTBINDRTCPSOCKET;
                }

                m_rtcpPort = rtcpport;
            }
            else
                m_rtcpPort = m_rtpPort;
        }

        // set socket buffer sizes

        size = params->GetRTPReceiveBuffer();
        if (setsockopt(rtpsock, SOL_SOCKET, SO_RCVBUF, (const char *) &size, sizeof(int)) != 0)
        {
            CLOSESOCKETS;
            MAINMUTEX_UNLOCK
            return ERR_RTP_UDPV4TRANS_CANTSETRTPRECEIVEBUF;
        }
        size = params->GetRTPSendBuffer();
        if (setsockopt(rtpsock, SOL_SOCKET, SO_SNDBUF, (const char *) &size, sizeof(int)) != 0)
        {
            CLOSESOCKETS;
            MAINMUTEX_UNLOCK
            return ERR_RTP_UDPV4TRANS_CANTSETRTPTRANSMITBUF;
        }

        if (rtpsock != rtcpsock) // no need to set RTCP flags when multiplexing
        {
            size = params->GetRTCPReceiveBuffer();
            if (setsockopt(rtcpsock, SOL_SOCKET, SO_RCVBUF, (const char *) &size, sizeof(int)) != 0)
            {
                CLOSESOCKETS;
                MAINMUTEX_UNLOCK
                return ERR_RTP_UDPV4TRANS_CANTSETRTCPRECEIVEBUF;
            }
            size = params->GetRTCPSendBuffer();
            if (setsockopt(rtcpsock, SOL_SOCKET, SO_SNDBUF, (const char *) &size, sizeof(int)) != 0)
            {
                CLOSESOCKETS;
                MAINMUTEX_UNLOCK
                return ERR_RTP_UDPV4TRANS_CANTSETRTCPTRANSMITBUF;
            }
        }
    }

    // Try to obtain local IP addresses

    localIPs = params->GetLocalIPList();
    if (localIPs.empty()) // User did not provide list of local IP addresses, calculate them
    {
        int status;

        if ((status = CreateLocalIPList()) < 0)
        {
            CLOSESOCKETS;
            MAINMUTEX_UNLOCK
            return status;
        }
    }

#ifdef RTP_SUPPORT_IPV4MULTICAST
    if (SetMulticastTTL(params->GetMulticastTTL()))
        supportsmulticasting = true;
    else
        supportsmulticasting = false;
#else // no multicast support enabled
    supportsmulticasting = false;
#endif // RTP_SUPPORT_IPV4MULTICAST

    if (maximumpacketsize > RTPUDPV4TRANS_MAXPACKSIZE)
    {
        CLOSESOCKETS;
        MAINMUTEX_UNLOCK
        return ERR_RTP_UDPV4TRANS_SPECIFIEDSIZETOOBIG;
    }

    if (!params->GetCreatedAbortDescriptors())
    {
        if ((status = m_abortDesc.Init()) < 0)
        {
            CLOSESOCKETS;
            MAINMUTEX_UNLOCK
            return status;
        }
        m_pAbortDesc = &m_abortDesc;
    }
    else
    {
        m_pAbortDesc = params->GetCreatedAbortDescriptors();
        if (!m_pAbortDesc->IsInitialized())
        {
            CLOSESOCKETS;
            MAINMUTEX_UNLOCK
            return ERR_RTP_ABORTDESC_NOTINIT;
        }
    }

    maxpacksize = maximumpacketsize;
    multicastTTL = params->GetMulticastTTL();
    mcastifaceIP = params->GetMulticastInterfaceIP();
    receivemode = RTPTransmitter::AcceptAll;

    localhostname = 0;
    localhostnamelength = 0;

    waitingfordata = false;
    created = true;
    MAINMUTEX_UNLOCK
    return 0;
}

void RTPUDPv4Transmitter::Destroy()
{
    if (!init)
        return;

    MAINMUTEX_LOCK
    if (!created)
    {
        MAINMUTEX_UNLOCK;
        return;
    }

    if (localhostname)
    {
        delete[] localhostname;
        localhostname = 0;
        localhostnamelength = 0;
    }

    CLOSESOCKETS;
    destinations.Clear();
#ifdef RTP_SUPPORT_IPV4MULTICAST
    multicastgroups.Clear();
#endif // RTP_SUPPORT_IPV4MULTICAST
    FlushPackets();
    ClearAcceptIgnoreInfo();
    localIPs.clear();
    created = false;

    if (waitingfordata)
    {
        m_pAbortDesc->SendAbortSignal();
        m_abortDesc.Destroy(); // Doesn't do anything if not initialized
    MAINMUTEX_UNLOCK
    WAITMUTEX_LOCK// to make sure that the WaitForIncomingData function ended
    WAITMUTEX_UNLOCK
}
else
    m_abortDesc.Destroy(); // Doesn't do anything if not initialized

MAINMUTEX_UNLOCK
}

RTPTransmissionInfo *RTPUDPv4Transmitter::GetTransmissionInfo()
{
if (!init)
return 0;

MAINMUTEX_LOCK
RTPTransmissionInfo *tinf = new RTPUDPv4TransmissionInfo(localIPs, rtpsock, rtcpsock, m_rtpPort, m_rtcpPort);
MAINMUTEX_UNLOCK
return tinf;
}

void RTPUDPv4Transmitter::DeleteTransmissionInfo(RTPTransmissionInfo *i)
{
if (!init)
return;

delete i;
}

int RTPUDPv4Transmitter::GetLocalHostName(uint8_t *buffer, size_t *bufferlength)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK
if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}

if (localhostname == 0)
{
if (localIPs.empty())
{
    MAINMUTEX_UNLOCK
    return ERR_RTP_UDPV4TRANS_NOLOCALIPS;
}

std::list<uint32_t>::const_iterator it;
std::list<std::string> hostnames;

for (it = localIPs.begin(); it != localIPs.end(); it++)
{
    bool founddouble = false;
    bool foundentry = true;

    while (!founddouble && foundentry)
    {
        struct hostent *he;
        uint8_t addr[4];
        uint32_t ip = (*it);

        addr[0] = (uint8_t) ((ip >> 24) & 0xFF);
        addr[1] = (uint8_t) ((ip >> 16) & 0xFF);
        addr[2] = (uint8_t) ((ip >> 8) & 0xFF);
        addr[3] = (uint8_t) (ip & 0xFF);
        he = gethostbyaddr((char *) addr, 4, AF_INET);
        if (he != 0)
        {
            std::string hname = std::string(he->h_name);
            std::list<std::string>::const_iterator it;

            for (it = hostnames.begin(); !founddouble && it != hostnames.end(); it++)
                if ((*it) == hname)
                    founddouble = true;

            if (!founddouble)
                hostnames.push_back(hname);

            int i = 0;
            while (!founddouble && he->h_aliases[i] != 0)
            {
                std::string hname = std::string(he->h_aliases[i]);

                for (it = hostnames.begin(); !founddouble && it != hostnames.end(); it++)
                    if ((*it) == hname)
                        founddouble = true;

                if (!founddouble)
                {
                    hostnames.push_back(hname);
                    i++;
                }
            }
        }
        else
            foundentry = false;
    }
}

bool found = false;

if (!hostnames.empty())	// try to select the most appropriate hostname
{
    std::list<std::string>::const_iterator it;

    hostnames.sort();
    for (it = hostnames.begin(); !found && it != hostnames.end(); it++)
    {
        if ((*it).find('.') != std::string::npos)
        {
            found = true;
            localhostnamelength = (*it).length();
            localhostname = new uint8_t[localhostnamelength + 1];
            if (localhostname == 0)
            {
                MAINMUTEX_UNLOCK
                return ERR_RTP_OUTOFMEM;
            }
            memcpy(localhostname, (*it).c_str(), localhostnamelength);
            localhostname[localhostnamelength] = 0;
        }
    }
}

if (!found) // use an IP address
{
    uint32_t ip;
    int len;
    char str[16];

    it = localIPs.begin();
    ip = (*it);

    RTP_SNPRINTF(str, 16, "%d.%d.%d.%d", (int) ((ip >> 24) & 0xFF), (int) ((ip >> 16) & 0xFF), (int) ((ip >> 8) & 0xFF), (int) (ip & 0xFF));
    len = strlen(str);

    localhostnamelength = len;
    localhostname = new uint8_t[localhostnamelength + 1];
    if (localhostname == 0)
    {
        MAINMUTEX_UNLOCK
        return ERR_RTP_OUTOFMEM;
    }
    memcpy(localhostname, str, localhostnamelength);
    localhostname[localhostnamelength] = 0;
}
}

if ((*bufferlength) < localhostnamelength)
{
*bufferlength = localhostnamelength; // tell the application the required size of the buffer
MAINMUTEX_UNLOCK
return ERR_RTP_TRANS_BUFFERLENGTHTOOSMALL;
}

memcpy(buffer, localhostname, localhostnamelength);
*bufferlength = localhostnamelength;

MAINMUTEX_UNLOCK
return 0;
}

bool RTPUDPv4Transmitter::ComesFromThisTransmitter(const RTPAddress *addr)
{
if (!init)
return false;

if (addr == 0)
return false;

MAINMUTEX_LOCK

bool v;

if (created && addr->GetAddressType() == RTPAddress::IPv4Address)
{
const RTPIPv4Address *addr2 = (const RTPIPv4Address *) addr;
bool found = false;
std::list<uint32_t>::const_iterator it;

it = localIPs.begin();
while (!found && it != localIPs.end())
{
    if (addr2->GetIP() == *it)
        found = true;
    else
        ++it;
}

if (!found)
    v = false;
else
{
    if (addr2->GetPort() == m_rtpPort || addr2->GetPort() == m_rtcpPort) // check for RTP port and RTCP port
        v = true;
    else
        v = false;
}
}
else
v = false;

MAINMUTEX_UNLOCK
return v;
}

int RTPUDPv4Transmitter::Poll()
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

int status;

MAINMUTEX_LOCK
if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
status = PollSocket(true); // poll RTP socket
if (rtpsock != rtcpsock) // no need to poll twice when multiplexing
{
if (status >= 0)
    status = PollSocket(false); // poll RTCP socket
}
MAINMUTEX_UNLOCK
return status;
}

int RTPUDPv4Transmitter::WaitForIncomingData(const RTPTime &delay, bool *dataavailable)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK

if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (waitingfordata)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_ALREADYWAITING;
}

SocketType abortSocket = m_pAbortDesc->GetAbortSocket();

SocketType socks[3] =
{ rtpsock, rtcpsock, abortSocket };
int8_t readflags[3] =
{ 0, 0, 0 };
const int idxRTP = 0;
const int idxRTCP = 1;
const int idxAbort = 2;

waitingfordata = true;

WAITMUTEX_LOCK
MAINMUTEX_UNLOCK

int status = RTPSelect(socks, readflags, 3, delay);
if (status < 0)
{
MAINMUTEX_LOCK
waitingfordata = false;
MAINMUTEX_UNLOCK
WAITMUTEX_UNLOCK
return status;
}

MAINMUTEX_LOCK
waitingfordata = false;
if (!created) // destroy called
{
MAINMUTEX_UNLOCK;
WAITMUTEX_UNLOCK
return 0;
}

 // if aborted, read from abort buffer
if (readflags[idxAbort])
m_pAbortDesc->ReadSignallingByte();

if (dataavailable != 0)
{
if (readflags[idxRTP] || readflags[idxRTCP])
    *dataavailable = true;
else
    *dataavailable = false;
}

MAINMUTEX_UNLOCK
WAITMUTEX_UNLOCK
return 0;
}

int RTPUDPv4Transmitter::AbortWait()
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK
if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (!waitingfordata)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTWAITING;
}

m_pAbortDesc->SendAbortSignal();

MAINMUTEX_UNLOCK
return 0;
}

int RTPUDPv4Transmitter::SendRTPData(const void *data, size_t len)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK

if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (len > maxpacksize)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_SPECIFIEDSIZETOOBIG;
}

destinations.GotoFirstElement();
while (destinations.HasCurrentElement())
{
sendto(rtpsock, (const char *) data, len, 0, (const struct sockaddr *) destinations.GetCurrentElement().GetRTPSockAddr(), sizeof(struct sockaddr_in));
destinations.GotoNextElement();
}

MAINMUTEX_UNLOCK
return 0;
}

int RTPUDPv4Transmitter::SendRTCPData(const void *data, size_t len)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK

if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (len > maxpacksize)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_SPECIFIEDSIZETOOBIG;
}

destinations.GotoFirstElement();
while (destinations.HasCurrentElement())
{
sendto(rtcpsock, (const char *) data, len, 0, (const struct sockaddr *) destinations.GetCurrentElement().GetRTCPSockAddr(), sizeof(struct sockaddr_in));
destinations.GotoNextElement();
}

MAINMUTEX_UNLOCK
return 0;
}

int RTPUDPv4Transmitter::AddDestination(const RTPAddress &addr)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK

if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}

RTPIPv4Destination dest;
if (!RTPIPv4Destination::AddressToDestination(addr, dest))
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_INVALIDADDRESSTYPE;
}

int status = destinations.AddElement(dest);

MAINMUTEX_UNLOCK
return status;
}

int RTPUDPv4Transmitter::DeleteDestination(const RTPAddress &addr)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK

if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
RTPIPv4Destination dest;
if (!RTPIPv4Destination::AddressToDestination(addr, dest))
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_INVALIDADDRESSTYPE;
}

int status = destinations.DeleteElement(dest);

MAINMUTEX_UNLOCK
return status;
}

void RTPUDPv4Transmitter::ClearDestinations()
{
if (!init)
return;

MAINMUTEX_LOCK
if (created)
destinations.Clear();
MAINMUTEX_UNLOCK
}

bool RTPUDPv4Transmitter::SupportsMulticasting()
{
if (!init)
return false;

MAINMUTEX_LOCK

bool v;

if (!created)
v = false;
else
v = supportsmulticasting;

MAINMUTEX_UNLOCK
return v;
}

#ifdef RTP_SUPPORT_IPV4MULTICAST

int RTPUDPv4Transmitter::JoinMulticastGroup(const RTPAddress &addr)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK

int status;

if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (addr.GetAddressType() != RTPAddress::IPv4Address)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_INVALIDADDRESSTYPE;
}

const RTPIPv4Address &address = (const RTPIPv4Address &) addr;
uint32_t mcastIP = address.GetIP();

if (!RTPUDPV4TRANS_IS_MCASTADDR(mcastIP))
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTAMULTICASTADDRESS;
}

status = multicastgroups.AddElement(mcastIP);
if (status >= 0)
{
RTPUDPV4TRANS_MCASTMEMBERSHIP(rtpsock, IP_ADD_MEMBERSHIP, mcastIP, status);
if (status != 0)
{
multicastgroups.DeleteElement(mcastIP);
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_COULDNTJOINMULTICASTGROUP;
}

if (rtpsock != rtcpsock) // no need to join multicast group twice when multiplexing
{
RTPUDPV4TRANS_MCASTMEMBERSHIP(rtcpsock, IP_ADD_MEMBERSHIP, mcastIP, status);
if (status != 0)
{
    RTPUDPV4TRANS_MCASTMEMBERSHIP(rtpsock, IP_DROP_MEMBERSHIP, mcastIP, status);
    multicastgroups.DeleteElement(mcastIP);
    MAINMUTEX_UNLOCK
    return ERR_RTP_UDPV4TRANS_COULDNTJOINMULTICASTGROUP;
}
}
}
MAINMUTEX_UNLOCK
return status;
}

int RTPUDPv4Transmitter::LeaveMulticastGroup(const RTPAddress &addr)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK

int status;

if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (addr.GetAddressType() != RTPAddress::IPv4Address)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_INVALIDADDRESSTYPE;
}

const RTPIPv4Address &address = (const RTPIPv4Address &) addr;
uint32_t mcastIP = address.GetIP();

if (!RTPUDPV4TRANS_IS_MCASTADDR(mcastIP))
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTAMULTICASTADDRESS;
}

status = multicastgroups.DeleteElement(mcastIP);
if (status >= 0)
{
RTPUDPV4TRANS_MCASTMEMBERSHIP(rtpsock, IP_DROP_MEMBERSHIP, mcastIP, status);
if (rtpsock != rtcpsock) // no need to leave multicast group twice when multiplexing
RTPUDPV4TRANS_MCASTMEMBERSHIP(rtcpsock, IP_DROP_MEMBERSHIP, mcastIP, status);

status = 0;
}

MAINMUTEX_UNLOCK
return status;
}

void RTPUDPv4Transmitter::LeaveAllMulticastGroups()
{
if (!init)
return;

MAINMUTEX_LOCK
if (created)
{
multicastgroups.GotoFirstElement();
while (multicastgroups.HasCurrentElement())
{
uint32_t mcastIP;
int status __attribute__((unused)) = 0;

mcastIP = multicastgroups.GetCurrentElement();

RTPUDPV4TRANS_MCASTMEMBERSHIP(rtpsock, IP_DROP_MEMBERSHIP, mcastIP, status);
if (rtpsock != rtcpsock) // no need to leave multicast group twice when multiplexing
    RTPUDPV4TRANS_MCASTMEMBERSHIP(rtcpsock, IP_DROP_MEMBERSHIP, mcastIP, status);

multicastgroups.GotoNextElement();
}
multicastgroups.Clear();
}
MAINMUTEX_UNLOCK
}

#else // no multicast support

int RTPUDPv4Transmitter::JoinMulticastGroup(const RTPAddress &addr)
{
return ERR_RTP_UDPV4TRANS_NOMULTICASTSUPPORT;
}

int RTPUDPv4Transmitter::LeaveMulticastGroup(const RTPAddress &addr)
{
return ERR_RTP_UDPV4TRANS_NOMULTICASTSUPPORT;
}

void RTPUDPv4Transmitter::LeaveAllMulticastGroups()
{
}

#endif // RTP_SUPPORT_IPV4MULTICAST

int RTPUDPv4Transmitter::SetReceiveMode(RTPTransmitter::ReceiveMode m)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK
if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (m != receivemode)
{
receivemode = m;
acceptignoreinfo.Clear();
}
MAINMUTEX_UNLOCK
return 0;
}

int RTPUDPv4Transmitter::AddToIgnoreList(const RTPAddress &addr)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK

int status;

if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (addr.GetAddressType() != RTPAddress::IPv4Address)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_INVALIDADDRESSTYPE;
}
if (receivemode != RTPTransmitter::IgnoreSome)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_DIFFERENTRECEIVEMODE;
}

const RTPIPv4Address &address = (const RTPIPv4Address &) addr;
status = ProcessAddAcceptIgnoreEntry(address.GetIP(), address.GetPort());

MAINMUTEX_UNLOCK
return status;
}

int RTPUDPv4Transmitter::DeleteFromIgnoreList(const RTPAddress &addr)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK

int status;

if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (addr.GetAddressType() != RTPAddress::IPv4Address)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_INVALIDADDRESSTYPE;
}
if (receivemode != RTPTransmitter::IgnoreSome)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_DIFFERENTRECEIVEMODE;
}

const RTPIPv4Address &address = (const RTPIPv4Address &) addr;
status = ProcessDeleteAcceptIgnoreEntry(address.GetIP(), address.GetPort());

MAINMUTEX_UNLOCK
return status;
}

void RTPUDPv4Transmitter::ClearIgnoreList()
{
if (!init)
return;

MAINMUTEX_LOCK
if (created && receivemode == RTPTransmitter::IgnoreSome)
ClearAcceptIgnoreInfo();
MAINMUTEX_UNLOCK
}

int RTPUDPv4Transmitter::AddToAcceptList(const RTPAddress &addr)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK

int status;

if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (addr.GetAddressType() != RTPAddress::IPv4Address)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_INVALIDADDRESSTYPE;
}
if (receivemode != RTPTransmitter::AcceptSome)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_DIFFERENTRECEIVEMODE;
}

const RTPIPv4Address &address = (const RTPIPv4Address &) addr;
status = ProcessAddAcceptIgnoreEntry(address.GetIP(), address.GetPort());

MAINMUTEX_UNLOCK
return status;
}

int RTPUDPv4Transmitter::DeleteFromAcceptList(const RTPAddress &addr)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK

int status;

if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (addr.GetAddressType() != RTPAddress::IPv4Address)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_INVALIDADDRESSTYPE;
}
if (receivemode != RTPTransmitter::AcceptSome)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_DIFFERENTRECEIVEMODE;
}

const RTPIPv4Address &address = (const RTPIPv4Address &) addr;
status = ProcessDeleteAcceptIgnoreEntry(address.GetIP(), address.GetPort());

MAINMUTEX_UNLOCK
return status;
}

void RTPUDPv4Transmitter::ClearAcceptList()
{
if (!init)
return;

MAINMUTEX_LOCK
if (created && receivemode == RTPTransmitter::AcceptSome)
ClearAcceptIgnoreInfo();
MAINMUTEX_UNLOCK
}

int RTPUDPv4Transmitter::SetMaximumPacketSize(size_t s)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;

MAINMUTEX_LOCK
if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (s > RTPUDPV4TRANS_MAXPACKSIZE)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_SPECIFIEDSIZETOOBIG;
}
maxpacksize = s;
MAINMUTEX_UNLOCK
return 0;
}

bool RTPUDPv4Transmitter::NewDataAvailable()
{
if (!init)
return false;

MAINMUTEX_LOCK

bool v;

if (!created)
v = false;
else
{
if (rawpacketlist.empty())
v = false;
else
v = true;
}

MAINMUTEX_UNLOCK
return v;
}

RTPRawPacket *RTPUDPv4Transmitter::GetNextPacket()
{
if (!init)
return 0;

MAINMUTEX_LOCK

RTPRawPacket *p;

if (!created)
{
MAINMUTEX_UNLOCK
return 0;
}
if (rawpacketlist.empty())
{
MAINMUTEX_UNLOCK
return 0;
}

p = *(rawpacketlist.begin());
rawpacketlist.pop_front();

MAINMUTEX_UNLOCK
return p;
}

// Here the private functions start...

#ifdef RTP_SUPPORT_IPV4MULTICAST
bool RTPUDPv4Transmitter::SetMulticastTTL(uint8_t ttl)
{
int ttl2, status;

ttl2 = (int) ttl;
status = setsockopt(rtpsock, IPPROTO_IP, IP_MULTICAST_TTL, (const char *) &ttl2, sizeof(int));
if (status != 0)
return false;

if (rtpsock != rtcpsock) // no need to set TTL twice when multiplexing
{
status = setsockopt(rtcpsock, IPPROTO_IP, IP_MULTICAST_TTL, (const char *) &ttl2, sizeof(int));
if (status != 0)
return false;
}
return true;
}
#endif // RTP_SUPPORT_IPV4MULTICAST

void RTPUDPv4Transmitter::FlushPackets()
{
std::list<RTPRawPacket*>::const_iterator it;

for (it = rawpacketlist.begin(); it != rawpacketlist.end(); ++it)
delete *it;
rawpacketlist.clear();
}

int RTPUDPv4Transmitter::PollSocket(bool rtp)
{
RTPSOCKLENTYPE fromlen;
int recvlen;
char packetbuffer[RTPUDPV4TRANS_MAXPACKSIZE];
#ifdef RTP_SOCKETTYPE_WINSOCK
SOCKET sock;
unsigned long len;
#else
size_t len;
int sock;
#endif // RTP_SOCKETTYPE_WINSOCK
struct sockaddr_in srcaddr;
bool dataavailable;

if (rtp)
sock = rtpsock;
else
sock = rtcpsock;

do
{
len = 0;
RTPIOCTL(sock, FIONREAD, &len);

if (len <= 0) // make sure a packet of length zero is not queued
{
 // An alternative workaround would be to just use non-blocking sockets.
 // However, since the user does have access to the sockets and I do not
 // know how this would affect anyone else's code, I chose to do it using
 // an extra select call in case ioctl says the length is zero.

int8_t isset = 0;
int status = RTPSelect(&sock, &isset, 1, RTPTime(0));
if (status < 0)
return status;

if (isset)
dataavailable = true;
else
dataavailable = false;
}
else
dataavailable = true;

if (dataavailable)
{
RTPTime curtime = RTPTime::CurrentTime();
fromlen = sizeof(struct sockaddr_in);
recvlen = recvfrom(sock, packetbuffer, RTPUDPV4TRANS_MAXPACKSIZE, 0, (struct sockaddr *) &srcaddr, &fromlen);
if (recvlen > 0)
{
bool acceptdata;

			// got data, process it
if (receivemode == RTPTransmitter::AcceptAll)
acceptdata = true;
else
acceptdata = ShouldAcceptData(ntohl(srcaddr.sin_addr.s_addr), ntohs(srcaddr.sin_port));

if (acceptdata)
{
RTPRawPacket *pack;
RTPIPv4Address *addr;
uint8_t *datacopy;

addr = new RTPIPv4Address(ntohl(srcaddr.sin_addr.s_addr), ntohs(srcaddr.sin_port));
if (addr == 0)
return ERR_RTP_OUTOFMEM;
datacopy = new uint8_t[recvlen];
if (datacopy == 0)
{
delete addr;
return ERR_RTP_OUTOFMEM;
}
memcpy(datacopy, packetbuffer, recvlen);

bool isrtp = rtp;
if (rtpsock == rtcpsock) // check payload type when multiplexing
{
isrtp = true;

if ((size_t) recvlen > sizeof(RTCPCommonHeader))
{
    RTCPCommonHeader *rtcpheader = (RTCPCommonHeader *) datacopy;
    uint8_t packettype = rtcpheader->packettype;

    if (packettype >= 200 && packettype <= 204)
        isrtp = false;
}
}

pack = new RTPRawPacket(datacopy, recvlen, addr, curtime, isrtp);
if (pack == 0)
{
delete addr;
delete[] datacopy;
return ERR_RTP_OUTOFMEM;
}
rawpacketlist.push_back(pack);
}
}
}
} while (dataavailable);

return 0;
}

int RTPUDPv4Transmitter::ProcessAddAcceptIgnoreEntry(uint32_t ip, uint16_t port)
{
acceptignoreinfo.GotoElement(ip);
if (acceptignoreinfo.HasCurrentElement()) // An entry for this IP address already exists
{
PortInfo *portinf = acceptignoreinfo.GetCurrentElement();

if (port == 0) // select all ports
{
portinf->all = true;
portinf->portlist.clear();
}
else if (!portinf->all)
{
std::list<uint16_t>::const_iterator it, begin, end;

begin = portinf->portlist.begin();
end = portinf->portlist.end();
for (it = begin; it != end; it++)
{
if (*it == port) // already in list
return 0;
}
portinf->portlist.push_front(port);
}
}
else // got to create an entry for this IP address
{
PortInfo *portinf;
int status;

portinf = new PortInfo();
if (port == 0) // select all ports
portinf->all = true;
else
portinf->portlist.push_front(port);

status = acceptignoreinfo.AddElement(ip, portinf);
if (status < 0)
{
delete portinf;
return status;
}
}

return 0;
}

void RTPUDPv4Transmitter::ClearAcceptIgnoreInfo()
{
acceptignoreinfo.GotoFirstElement();
while (acceptignoreinfo.HasCurrentElement())
{
PortInfo *inf;

inf = acceptignoreinfo.GetCurrentElement();
delete inf;
acceptignoreinfo.GotoNextElement();
}
acceptignoreinfo.Clear();
}

int RTPUDPv4Transmitter::ProcessDeleteAcceptIgnoreEntry(uint32_t ip, uint16_t port)
{
acceptignoreinfo.GotoElement(ip);
if (!acceptignoreinfo.HasCurrentElement())
return ERR_RTP_UDPV4TRANS_NOSUCHENTRY;

PortInfo *inf;

inf = acceptignoreinfo.GetCurrentElement();
if (port == 0) // delete all entries
{
inf->all = false;
inf->portlist.clear();
}
else // a specific port was selected
{
if (inf->all) // currently, all ports are selected. Add the one to remove to the list
{
 // we have to check if the list doesn't contain the port already
std::list<uint16_t>::const_iterator it, begin, end;

begin = inf->portlist.begin();
end = inf->portlist.end();
for (it = begin; it != end; it++)
{
if (*it == port) // already in list: this means we already deleted the entry
return ERR_RTP_UDPV4TRANS_NOSUCHENTRY;
}
inf->portlist.push_front(port);
}
else // check if we can find the port in the list
{
std::list<uint16_t>::iterator it, begin, end;

begin = inf->portlist.begin();
end = inf->portlist.end();
for (it = begin; it != end; ++it)
{
if (*it == port) // found it!
{
inf->portlist.erase(it);
return 0;
}
}
 // didn't find it
return ERR_RTP_UDPV4TRANS_NOSUCHENTRY;
}
}
return 0;
}

bool RTPUDPv4Transmitter::ShouldAcceptData(uint32_t srcip, uint16_t srcport)
{
if (receivemode == RTPTransmitter::AcceptSome)
{
PortInfo *inf;

acceptignoreinfo.GotoElement(srcip);
if (!acceptignoreinfo.HasCurrentElement())
return false;

inf = acceptignoreinfo.GetCurrentElement();
if (!inf->all) // only accept the ones in the list
{
std::list<uint16_t>::const_iterator it, begin, end;

begin = inf->portlist.begin();
end = inf->portlist.end();
for (it = begin; it != end; it++)
{
if (*it == srcport)
return true;
}
return false;
}
else // accept all, except the ones in the list
{
std::list<uint16_t>::const_iterator it, begin, end;

begin = inf->portlist.begin();
end = inf->portlist.end();
for (it = begin; it != end; it++)
{
if (*it == srcport)
return false;
}
return true;
}
}
else // IgnoreSome
{
PortInfo *inf;

acceptignoreinfo.GotoElement(srcip);
if (!acceptignoreinfo.HasCurrentElement())
return true;

inf = acceptignoreinfo.GetCurrentElement();
if (!inf->all) // ignore the ports in the list
{
std::list<uint16_t>::const_iterator it, begin, end;

begin = inf->portlist.begin();
end = inf->portlist.end();
for (it = begin; it != end; it++)
{
if (*it == srcport)
return false;
}
return true;
}
else // ignore all, except the ones in the list
{
std::list<uint16_t>::const_iterator it, begin, end;

begin = inf->portlist.begin();
end = inf->portlist.end();
for (it = begin; it != end; it++)
{
if (*it == srcport)
return true;
}
return false;
}
}
return true;
}

int RTPUDPv4Transmitter::CreateLocalIPList()
{
 // first try to obtain the list from the network interface info

if (!GetLocalIPList_Interfaces())
{
 // If this fails, we'll have to depend on DNS info
GetLocalIPList_DNS();
}
AddLoopbackAddress();
return 0;
}

#ifdef RTP_SOCKETTYPE_WINSOCK

bool RTPUDPv4Transmitter::GetLocalIPList_Interfaces()
{
unsigned char buffer[RTPUDPV4TRANS_IFREQBUFSIZE];
DWORD outputsize;
DWORD numaddresses,i;
SOCKET_ADDRESS_LIST *addrlist;

if (WSAIoctl(rtpsock,SIO_ADDRESS_LIST_QUERY,NULL,0,&buffer,RTPUDPV4TRANS_IFREQBUFSIZE,&outputsize,NULL,NULL))
return false;

addrlist = (SOCKET_ADDRESS_LIST *)buffer;
numaddresses = addrlist->iAddressCount;
for (i = 0; i < numaddresses; i++)
{
SOCKET_ADDRESS *sockaddr = &(addrlist->Address[i]);
if (sockaddr->iSockaddrLength == sizeof(struct sockaddr_in)) // IPv4 address
{
struct sockaddr_in *addr = (struct sockaddr_in *)sockaddr->lpSockaddr;

localIPs.push_back(ntohl(addr->sin_addr.s_addr));
}
}

if (localIPs.empty())
return false;

return true;
}

#else // use either getifaddrs or ioctl

#ifdef RTP_SUPPORT_IFADDRS

bool RTPUDPv4Transmitter::GetLocalIPList_Interfaces()
{
struct ifaddrs *addrs, *tmp;

getifaddrs(&addrs);
tmp = addrs;

while (tmp != 0)
{
if (tmp->ifa_addr != 0 && tmp->ifa_addr->sa_family == AF_INET)
{
struct sockaddr_in *inaddr = (struct sockaddr_in *) tmp->ifa_addr;
localIPs.push_back(ntohl(inaddr->sin_addr.s_addr));
}
tmp = tmp->ifa_next;
}

freeifaddrs(addrs);

if (localIPs.empty())
return false;
return true;
}

#else // user ioctl

bool RTPUDPv4Transmitter::GetLocalIPList_Interfaces()
{
int status;
char buffer[RTPUDPV4TRANS_IFREQBUFSIZE];
struct ifconf ifc;
struct ifreq *ifr;
struct sockaddr *sa;
char *startptr,*endptr;
int remlen;

ifc.ifc_len = RTPUDPV4TRANS_IFREQBUFSIZE;
ifc.ifc_buf = buffer;
status = ioctl(rtpsock,SIOCGIFCONF,&ifc);
if (status < 0)
return false;

startptr = (char *)ifc.ifc_req;
endptr = startptr + ifc.ifc_len;
remlen = ifc.ifc_len;
while((startptr < endptr) && remlen >= (int)sizeof(struct ifreq))
{
ifr = (struct ifreq *)startptr;
sa = &(ifr->ifr_addr);
#ifdef RTP_HAVE_SOCKADDR_LEN
if (sa->sa_len <= sizeof(struct sockaddr))
{
if (sa->sa_len == sizeof(struct sockaddr_in) && sa->sa_family == PF_INET)
{
uint32_t ip;
struct sockaddr_in *addr = (struct sockaddr_in *)sa;

ip = ntohl(addr->sin_addr.s_addr);
localIPs.push_back(ip);
}
remlen -= sizeof(struct ifreq);
startptr += sizeof(struct ifreq);
}
else
{
int l = sa->sa_len-sizeof(struct sockaddr)+sizeof(struct ifreq);

remlen -= l;
startptr += l;
}
#else // don't have sa_len in struct sockaddr
if (sa->sa_family == PF_INET)
{
uint32_t ip;
struct sockaddr_in *addr = (struct sockaddr_in *)sa;

ip = ntohl(addr->sin_addr.s_addr);
localIPs.push_back(ip);
}
remlen -= sizeof(struct ifreq);
startptr += sizeof(struct ifreq);

#endif // RTP_HAVE_SOCKADDR_LEN
}

if (localIPs.empty())
return false;
return true;
}

#endif // RTP_SUPPORT_IFADDRS

#endif // RTP_SOCKETTYPE_WINSOCK

void RTPUDPv4Transmitter::GetLocalIPList_DNS()
{
struct hostent *he;
char name[1024];
bool done;
int i, j;

gethostname(name, 1023);
name[1023] = 0;
he = gethostbyname(name);
if (he == 0)
return;

i = 0;
done = false;
while (!done)
{
if (he->h_addr_list[i] == NULL)
done = true;
else
{
uint32_t ip = 0;

for (j = 0; j < 4; j++)
ip |= ((uint32_t) ((unsigned char) he->h_addr_list[i][j]) << ((3 - j) * 8));
localIPs.push_back(ip);
i++;
}
}
}

void RTPUDPv4Transmitter::AddLoopbackAddress()
{
uint32_t loopbackaddr = (((uint32_t) 127) << 24) | ((uint32_t) 1);
std::list<uint32_t>::const_iterator it;
bool found = false;

for (it = localIPs.begin(); !found && it != localIPs.end(); it++)
{
if (*it == loopbackaddr)
found = true;
}

if (!found)
localIPs.push_back(loopbackaddr);
}

} // end namespace