//===========================================================// CAPMT object (C++)// Handles some CAMPT and CA I/O// Code is independent of encryption scheme used// (c) Aug 2008 by Dirktator//===========================================================#include "capmt.h"#include "/data/dreambox/tuxbox-bb/build/tmp/staging/powerpc-linux/include/ost/ca.h"#include <fcntl.h>#include <stdio.h>#include <stdlib.h>#include <sys/ioctl.h>#include <sys/poll.h>#include <sys/socket.h>#include <sys/types.h>#include <stropts.h>	#include <sys/un.h>#include <unistd.h>#include <errno.h>//constructor, basically just passed debug informationca_handler::ca_handler(int debug){	dbg = debug;		//after the object is created, set the dbg value as defined by the command line parameter, one of these silly C++ syntax things}//the Linux DVB API does not provide a mechanism to read the program the user is watching//thus we must read the CAPMT device to receive this info from Enigma//inputs: 	none//returns:	int ca_handler::Read_CAPMT(void){	int i, s,t, len;	struct sockaddr_un remote;	unsigned char buffer[8192];	if (dbg) printf("Reading CAPMT device\n");	if ((s=socket(AF_UNIX,SOCK_STREAM,0))==-1)	//We need a local socket to read the data from Enigma! This is client code (PLi)	{		perror("\tCAPMT socket");		return 0;	}	if (dbg) printf("\tTrying to connect...\n");	remote.sun_family = AF_UNIX;			//internal Unix socket (non-IP)    strcpy(remote.sun_path, CAPMTNAME);		//set the local socket path, something like /tmp/.listen.camd.socket or something	len = strlen(remote.sun_path) + sizeof(remote.sun_family);    	if (connect(s, (struct sockaddr *)&remote, len) == -1) 	//connect to the socket	{    	perror("connect");		close(s);        return 0;    }	if (dbg) printf("\tConnected.\n");		if ((t=recv(s,buffer,100,0))>0)			//receive data from the socket	{		i=(buffer[7]<<8)+buffer[8];		if (dbg) printf("\tSID:%04x (%04d)\n",i,i);		}		else perror("\tCAPMT recv");	close(s);	return(i);}//Unscramble the video stream by writing both control words to the CA device//inputs:	ca device file handler, 2 control word buffers (8 bytes each) and some index which's function is unclear//Returns:	nothing, drives the Dreambox's unscramblingvoid ca_handler::write_control_words(unsigned int ca, unsigned char *cw_0, unsigned char *cw_1, int index){  	ca_descr_t ca_descr;  	long long ecw,ocw;  	int i;	static char lastcw0[8], lastcw1[8];			if (memcmp(cw_0,lastcw0,8))	{		printf("write control words\nCW0:");		for (i=0;i<8;i++) printf("%02x ",cw_0[i]);		printf("\n");				ca_descr.index = index;	  	ca_descr.parity = 0;		memcpy(lastcw0,cw_0,8);		memcpy(ca_descr.cw,cw_0,8);			if (ioctl(ca,CA_SET_DESCR,&ca_descr) < 0) perror("CA_SET_DESCR");		else printf("\t written CW0 to CA device\n");	}  	if (memcmp(cw_1,lastcw1,8))	{		printf("write control words\nCW1:");		for (i=0;i<8;i++) printf("%02x ",cw_1[i]);		printf("\n");				ca_descr.index = index;	  	ca_descr.parity = 1;		memcpy(lastcw1,cw_1,8);		memcpy(ca_descr.cw,cw_1,8);		if (ioctl(ca,CA_SET_DESCR,&ca_descr) < 0) perror("CA_SET_DESCR");		else printf("\t written CW1 to CA device\n");	}}