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/*
* filter.cpp: A plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
* $Id$
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <unistd.h>
#include "filter.h"
#undef WRITE_RAW
#if __GNUC__ > 3
#define UNUSED(v) UNUSED_ ## v __attribute__((unused))
#else
#define UNUSED(x) x
#endif
cFilterInfosatepg::cFilterInfosatepg(cGlobalInfosatepg *Global)
{
global = Global;
Set(global->Pid,0,0);
}
u_long cFilterInfosatepg::do_sum(u_long sum, u_char *buf, int nBytes)
{
int nleft=nBytes;
u_short *w = (u_short*)buf;
while (nleft > 1)
{
sum += *w++;
nleft -= 2;
}
if (nleft == 1)
{
u_short answer = 0;
*(u_char*)(&answer) = *(u_char*)w;
sum += answer;
}
return sum;
}
u_short cFilterInfosatepg::foldsum(u_long sum)
{
while (sum>>16)
sum = (sum >> 16) + (sum & 0xFFFF);
return ((u_short) ~sum);
}
u_short cFilterInfosatepg::IPChecksum(ip *ipHeader)
{
return foldsum(do_sum(0, (u_char*) ipHeader, sizeof(ip)));
} /* IpChecksum() */
u_short cFilterInfosatepg::UDPChecksum(ip *ipHeader, udphdr *udpHeader)
{
u_long sum = 0;
// Ip-Pseudo-Header
sum = do_sum(sum, (u_char*)(&ipHeader->ip_src), sizeof(ipHeader->ip_src));
sum = do_sum(sum, (u_char*)(&ipHeader->ip_dst), sizeof(ipHeader->ip_dst));
#ifdef __linux__
sum += udpHeader->len;
#else
sum += udpHeader->uh_ulen;
#endif
sum += ipHeader->ip_p<<8;
#ifdef __linux__
sum = do_sum(sum, (u_char*)udpHeader, ntohs(udpHeader->len));
#else
sum = do_sum(sum, (u_char*)udpHeader, ntohs(udpHeader->uh_ulen));
#endif
return foldsum(sum);
}
void cFilterInfosatepg::Process(u_short UNUSED(Pid), u_char UNUSED(Tid), const u_char *Data, int Length)
{
#define SECT_IP_HDR_START 12
#define SECT_UDP_HDR_START 32
#define SECT_IS_HDR_START 40
#define SECT_IS_DATA_START 52
if (Data[0]!=0x3E) return;
struct ether_header eth_hdr;
memset(ð_hdr,0,sizeof(struct ether_header));
eth_hdr.ether_dhost[0]=Data[11];
eth_hdr.ether_dhost[1]=Data[10];
eth_hdr.ether_dhost[2]=Data[9];
eth_hdr.ether_dhost[3]=Data[8];
eth_hdr.ether_dhost[4]=Data[4];
eth_hdr.ether_dhost[5]=Data[3];
// check mac and range
if (!global->CheckMAC(ð_hdr)) return;
int mac = eth_hdr.ether_dhost[5];
global->ActualMac=mac;
struct ip *ip_hdr = (ip *) &Data[SECT_IP_HDR_START];
struct udphdr *udp_hdr = (udphdr *) &Data[SECT_UDP_HDR_START];
// Only IPv4
if (ip_hdr->ip_v!=4) return;
// Check IP checksum
if (IPChecksum(ip_hdr)!=0)
{
esyslog("infosatepg: ip checksum error");
return;
}
// Only UDP
if (ip_hdr->ip_p!=17) return;
// Check UDP checksum
if (UDPChecksum(ip_hdr,udp_hdr)!=0)
{
esyslog("infosatepg: udp checksum error");
return;
}
struct infosathdr *ishdr = (struct infosathdr*) &Data[SECT_IS_HDR_START];
if (ntohs(ishdr->technisatId)!=0x0001) return;
int pktnr = ntohs(ishdr->pktnr);
int pktcnt = ntohs(ishdr->pktcnt);
const u_char *infosatdata = &Data[SECT_IS_DATA_START];
int len = Length - SECT_IS_DATA_START-4;
char file[1024];
snprintf(file,sizeof(file),"%s/infosatepg%02i%02i_%03i.dat",global->Directory(),ishdr->day,ishdr->month,
pktcnt);
if (global->Infosatdata[mac].NeverSeen(ishdr->day,ishdr->month,pktcnt))
{
// never seen such a packet -> init structure
global->Infosatdata[mac].Init(file,ishdr->day,ishdr->month,pktcnt);
}
// Check if we missed a packet
global->Infosatdata[mac].CheckMissed(pktnr);
// Check if we already have this packet
if (global->Infosatdata[mac].GetBit(pktnr))
{
global->Infosatdata[mac].SetLastPkt(pktnr);
return;
}
#ifdef VDRDEBUG
dsyslog("infosatepg: mac=%02x-%02x-%02x-%02x-%02x-%02x",eth_hdr.ether_dhost[0],eth_hdr.ether_dhost[1],
eth_hdr.ether_dhost[2],eth_hdr.ether_dhost[3],eth_hdr.ether_dhost[4],eth_hdr.ether_dhost[5] );
dsyslog("infosatepg: tid=%04i tbl=%04i stbl=%04i day=%02i month=%02i pktnr=%03i pktcnt=%03i len=%i",
ntohs(ishdr->technisatId),ishdr->tableId,ishdr->tablesubId,ishdr->day,
ishdr->month, pktnr, pktcnt, len);
dsyslog("infosatepg: save to %s", file);
#endif
int f=open(file,O_RDWR|O_CREAT,0664);
if (f==-1)
{
if (errno!=ENOSPC)
{
esyslog("infosatepg: unable to create file '%s'", file);
}
return;
}
off_t offset = (off_t) (pktnr*1400);
if (lseek(f,offset,SEEK_SET)!=(off_t) -1)
{
#ifdef VDRDEBUG
dsyslog("infosatepg: writing to %li",offset);
#endif
if (write(f,infosatdata,len)==len)
{
// set bit in Infosatdata bitfield
global->Infosatdata[mac].SetBit(pktnr,true);
}
}
close(f);
#ifdef WRITE_RAW
sprintf(file,"%s/%03i.dat",dir,pktnr);
f=open(file,O_RDWR|O_CREAT,0664);
if (f==-1) return;
write(f,Data,Length);
close(f);
#endif
// check if we have all packets
if (global->Infosatdata[mac].CheckReceivedAll())
{
// we have all packets
isyslog("infosatepg: day=%02i month=%02i fully received", ishdr->day,ishdr->month);
}
}
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