mirror of
https://projects.vdr-developer.org/git/vdr-plugin-streamdev.git
synced 2023-10-10 19:16:51 +02:00
364 lines
13 KiB
C
364 lines
13 KiB
C
/*
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* $Id: connection.c,v 1.16 2010/08/03 10:51:53 schmirl Exp $
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*/
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#include "server/connection.h"
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#include "server/setup.h"
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#include "server/suspend.h"
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#include "common.h"
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#include <vdr/tools.h>
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#include <vdr/transfer.h>
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#include <string.h>
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#include <stdarg.h>
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#include <errno.h>
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cServerConnection::cServerConnection(const char *Protocol, int Type):
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cTBSocket(Type),
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m_Protocol(Protocol),
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m_DeferClose(false),
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m_Pending(false),
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m_ReadBytes(0),
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m_WriteBytes(0),
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m_WriteIndex(0)
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{
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}
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cServerConnection::~cServerConnection()
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{
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}
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const cChannel* cServerConnection::ChannelFromString(const char *String, int *Apid, int *Dpid) {
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const cChannel *channel = NULL;
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char *string = strdup(String);
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char *ptr, *end;
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int apididx = 0;
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if ((ptr = strrchr(string, '+')) != NULL) {
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*(ptr++) = '\0';
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apididx = strtoul(ptr, &end, 10);
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Dprintf("found apididx: %d\n", apididx);
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}
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if (isnumber(string)) {
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int temp = strtol(String, NULL, 10);
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if (temp >= 1 && temp <= Channels.MaxNumber())
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channel = Channels.GetByNumber(temp);
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} else {
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channel = Channels.GetByChannelID(tChannelID::FromString(string));
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if (channel == NULL) {
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int i = 1;
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while ((channel = Channels.GetByNumber(i, 1)) != NULL) {
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if (String == channel->Name())
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break;
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i = channel->Number() + 1;
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}
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}
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}
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if (channel != NULL && apididx > 0) {
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int apid = 0, dpid = 0;
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int index = 1;
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for (int i = 0; channel->Apid(i) != 0; ++i, ++index) {
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if (index == apididx) {
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apid = channel->Apid(i);
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break;
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}
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}
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if (apid == 0) {
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for (int i = 0; channel->Dpid(i) != 0; ++i, ++index) {
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if (index == apididx) {
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dpid = channel->Dpid(i);
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break;
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}
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}
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}
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if (Apid != NULL)
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*Apid = apid;
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if (Dpid != NULL)
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*Dpid = dpid;
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}
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free(string);
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return channel;
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}
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bool cServerConnection::Read(void)
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{
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int b;
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if ((b = cTBSocket::Read(m_ReadBuffer + m_ReadBytes,
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sizeof(m_ReadBuffer) - m_ReadBytes - 1)) < 0) {
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esyslog("ERROR: read from client (%s) %s:%d failed: %m",
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m_Protocol, RemoteIp().c_str(), RemotePort());
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return false;
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}
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if (b == 0) {
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isyslog("client (%s) %s:%d has closed connection",
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m_Protocol, RemoteIp().c_str(), RemotePort());
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return false;
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}
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m_ReadBytes += b;
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m_ReadBuffer[m_ReadBytes] = '\0';
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char *end;
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bool result = true;
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while ((end = strchr(m_ReadBuffer, '\012')) != NULL) {
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*end = '\0';
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if (end > m_ReadBuffer && *(end - 1) == '\015')
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*(end - 1) = '\0';
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if (!Command(m_ReadBuffer))
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return false;
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m_ReadBytes -= ++end - m_ReadBuffer;
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if (m_ReadBytes > 0)
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memmove(m_ReadBuffer, end, m_ReadBytes);
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}
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if (m_ReadBytes == sizeof(m_ReadBuffer) - 1) {
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esyslog("ERROR: streamdev: input buffer overflow (%s) for %s:%d",
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m_Protocol, RemoteIp().c_str(), RemotePort());
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return false;
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}
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return result;
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}
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bool cServerConnection::Write(void)
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{
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int b;
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if ((b = cTBSocket::Write(m_WriteBuffer + m_WriteIndex,
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m_WriteBytes - m_WriteIndex)) < 0) {
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esyslog("ERROR: streamdev: write to client (%s) %s:%d failed: %m",
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m_Protocol, RemoteIp().c_str(), RemotePort());
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return false;
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}
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m_WriteIndex += b;
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if (m_WriteIndex == m_WriteBytes) {
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m_WriteIndex = 0;
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m_WriteBytes = 0;
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if (m_Pending)
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Command(NULL);
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if (m_DeferClose)
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return false;
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Flushed();
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}
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return true;
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}
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bool cServerConnection::Respond(const char *Message, bool Last, ...)
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{
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char *buffer;
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int length;
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va_list ap;
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va_start(ap, Last);
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length = vasprintf(&buffer, Message, ap);
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va_end(ap);
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if (length < 0) {
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esyslog("ERROR: streamdev: buffer allocation failed (%s) for %s:%d",
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m_Protocol, RemoteIp().c_str(), RemotePort());
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return false;
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}
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if (m_WriteBytes + length + 2 > sizeof(m_WriteBuffer)) {
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esyslog("ERROR: streamdev: output buffer overflow (%s) for %s:%d",
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m_Protocol, RemoteIp().c_str(), RemotePort());
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free(buffer);
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return false;
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}
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Dprintf("OUT: |%s|\n", buffer);
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memcpy(m_WriteBuffer + m_WriteBytes, buffer, length);
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free(buffer);
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m_WriteBytes += length;
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m_WriteBuffer[m_WriteBytes++] = '\015';
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m_WriteBuffer[m_WriteBytes++] = '\012';
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m_Pending = !Last;
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return true;
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}
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#if APIVERSNUM >= 10700
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static int GetClippedNumProvidedSystems(int AvailableBits, cDevice *Device)
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{
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int MaxNumProvidedSystems = 1 << AvailableBits;
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int NumProvidedSystems = Device->NumProvidedSystems();
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if (NumProvidedSystems > MaxNumProvidedSystems) {
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esyslog("ERROR: device %d supports %d modulation systems but cDevice::GetDevice() currently only supports %d delivery systems which should be fixed", Device->CardIndex() + 1, NumProvidedSystems, MaxNumProvidedSystems);
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NumProvidedSystems = MaxNumProvidedSystems;
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}
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else if (NumProvidedSystems <= 0) {
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esyslog("ERROR: device %d reported an invalid number (%d) of supported delivery systems - assuming 1", Device->CardIndex() + 1, NumProvidedSystems);
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NumProvidedSystems = 1;
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}
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return NumProvidedSystems;
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}
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#endif
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/*
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* copy of cDevice::GetDevice(...) but without side effects (not detaching receivers)
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*/
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cDevice* cServerConnection::CheckDevice(const cChannel *Channel, int Priority, bool LiveView, const cDevice *AvoidDevice)
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{
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//cDevice *AvoidDevice = avoidDevice;
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//avoidDevice = NULL;
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// Collect the current priorities of all CAM slots that can decrypt the channel:
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int NumCamSlots = CamSlots.Count();
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int SlotPriority[NumCamSlots];
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int NumUsableSlots = 0;
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if (Channel->Ca() >= CA_ENCRYPTED_MIN) {
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for (cCamSlot *CamSlot = CamSlots.First(); CamSlot; CamSlot = CamSlots.Next(CamSlot)) {
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SlotPriority[CamSlot->Index()] = MAXPRIORITY + 1; // assumes it can't be used
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if (CamSlot->ModuleStatus() == msReady) {
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if (CamSlot->ProvidesCa(Channel->Caids())) {
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if (!ChannelCamRelations.CamChecked(Channel->GetChannelID(), CamSlot->SlotNumber())) {
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SlotPriority[CamSlot->Index()] = CamSlot->Priority();
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NumUsableSlots++;
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}
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}
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}
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}
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if (!NumUsableSlots)
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return NULL; // no CAM is able to decrypt this channel
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}
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bool NeedsDetachReceivers = false;
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cDevice *d = NULL;
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//cCamSlot *s = NULL;
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uint32_t Impact = 0xFFFFFFFF; // we're looking for a device with the least impact
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for (int j = 0; j < NumCamSlots || !NumUsableSlots; j++) {
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if (NumUsableSlots && SlotPriority[j] > MAXPRIORITY)
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continue; // there is no CAM available in this slot
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for (int i = 0; i < cDevice::NumDevices(); i++) {
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cDevice *device = cDevice::GetDevice(i);
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if (device == AvoidDevice)
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continue; // we've been asked to skip this device
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if (Channel->Ca() && Channel->Ca() <= CA_DVB_MAX && Channel->Ca() != device->CardIndex() + 1)
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continue; // a specific card was requested, but not this one
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if (NumUsableSlots && !CamSlots.Get(j)->Assign(device, true))
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continue; // CAM slot can't be used with this device
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bool ndr;
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if (device->ProvidesChannel(Channel, Priority, &ndr)) { // this device is basicly able to do the job
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if (NumUsableSlots && device->CamSlot() && device->CamSlot() != CamSlots.Get(j))
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ndr = true; // using a different CAM slot requires detaching receivers
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// Put together an integer number that reflects the "impact" using
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// this device would have on the overall system. Each condition is represented
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// by one bit in the number (or several bits, if the condition is actually
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// a numeric value). The sequence in which the conditions are listed corresponds
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// to their individual severity, where the one listed first will make the most
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// difference, because it results in the most significant bit of the result.
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uint32_t imp = 0;
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imp <<= 1; imp |= LiveView ? !device->IsPrimaryDevice() || ndr : 0; // prefer the primary device for live viewing if we don't need to detach existing receivers
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imp <<= 1; imp |= !device->Receiving() && (device != cTransferControl::ReceiverDevice() || device->IsPrimaryDevice()) || ndr; // use receiving devices if we don't need to detach existing receivers, but avoid primary device in local transfer mode
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imp <<= 1; imp |= device->Receiving(); // avoid devices that are receiving
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#if APIVERSNUM >= 10700
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imp <<= 2; imp |= GetClippedNumProvidedSystems(2, device) - 1; // avoid cards which support multiple delivery systems
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#endif
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imp <<= 1; imp |= device == cTransferControl::ReceiverDevice(); // avoid the Transfer Mode receiver device
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imp <<= 8; imp |= min(max(device->Priority() + MAXPRIORITY, 0), 0xFF); // use the device with the lowest priority (+MAXPRIORITY to assure that values -99..99 can be used)
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imp <<= 8; imp |= min(max((NumUsableSlots ? SlotPriority[j] : 0) + MAXPRIORITY, 0), 0xFF); // use the CAM slot with the lowest priority (+MAXPRIORITY to assure that values -99..99 can be used)
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imp <<= 1; imp |= ndr; // avoid devices if we need to detach existing receivers
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imp <<= 1; imp |= device->IsPrimaryDevice(); // avoid the primary device
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imp <<= 1; imp |= NumUsableSlots ? 0 : device->HasCi(); // avoid cards with Common Interface for FTA channels
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imp <<= 1; imp |= device->HasDecoder(); // avoid full featured cards
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imp <<= 1; imp |= NumUsableSlots ? !ChannelCamRelations.CamDecrypt(Channel->GetChannelID(), j + 1) : 0; // prefer CAMs that are known to decrypt this channel
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if (imp < Impact) {
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// This device has less impact than any previous one, so we take it.
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Impact = imp;
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d = device;
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NeedsDetachReceivers = ndr;
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}
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}
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}
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if (!NumUsableSlots)
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break; // no CAM necessary, so just one loop over the devices
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}
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return d;
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}
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cDevice *cServerConnection::GetDevice(const cChannel *Channel, int Priority)
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{
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const cChannel *current = Channels.GetByNumber(cDevice::CurrentChannel());
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// turn off the streams of this connection
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Detach();
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// This call may detach receivers of the device it returns
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cDevice *device = cDevice::GetDevice(Channel, Priority, false);
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if (device && device == cDevice::ActualDevice()
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&& (!device->IsPrimaryDevice() || !device->Replaying())
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&& !cSuspendCtl::IsActive()
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&& current != NULL
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&& !TRANSPONDER(Channel, current)) {
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// now we would have to switch away live tv...let's see if live tv
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// can be handled by another device
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#if VDRVERSNUM >= 10516
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cDevice::SetAvoidDevice(device);
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cDevice *newdev = cDevice::GetDevice(current, 0, true);
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#else
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cDevice *newdev = CheckDevice(current, 0, true, device);
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#endif
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if (newdev) {
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newdev->SwitchChannel(current, true);
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}
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else if (StreamdevServerSetup.SuspendMode == smAlways) {
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Channels.SwitchTo(Channel->Number());
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Skins.Message(mtInfo, tr("Streaming active"));
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}
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else
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device = NULL;
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}
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if (!device) {
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// can't switch - continue the current stream
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Attach();
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dsyslog("streamdev: GetDevice failed for channel %s at priority %d", Channel->Name(), Priority);
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}
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return device;
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}
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bool cServerConnection::ProvidesChannel(const cChannel *Channel, int Priority)
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{
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const cChannel *current = Channels.GetByNumber(cDevice::CurrentChannel());
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cDevice *device = CheckDevice(Channel, Priority, false);
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if (!device || (device == cDevice::ActualDevice()
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&& (!device->IsPrimaryDevice() || !device->Replaying())
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&& !cSuspendCtl::IsActive()
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&& StreamdevServerSetup.SuspendMode != smAlways
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&& current != NULL
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&& !TRANSPONDER(Channel, current))) {
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// mustn't switch actual device
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// maybe a device would be free if THIS connection did turn off its streams?
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Detach();
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device = CheckDevice(Channel, Priority, false);
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Attach();
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if (device && device == cDevice::ActualDevice()
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&& (!device->IsPrimaryDevice() || !device->Replaying())
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&& !cSuspendCtl::IsActive()
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&& StreamdevServerSetup.SuspendMode != smAlways
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&& current != NULL
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&& !TRANSPONDER(Channel, current)) {
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// now we would have to switch away live tv...let's see if live tv
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// can be handled by another device
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cDevice *newdev = CheckDevice(current, 0, true, device);
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if (!newdev) {
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device = NULL;
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dsyslog("streamdev: Not providing channel %s at priority %d - live TV not suspended", Channel->Name(), Priority);
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}
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}
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else if (!device)
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dsyslog("streamdev: No device provides channel %s at priority %d", Channel->Name(), Priority);
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}
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return device;
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}
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