int
main(int argc, char **argv)
{
static xyc *Z; static nde *N;
static double **A, *u;
initop(argc, argv);
fp2mesh(stdfp(),Z,N);
ary2(A,dim1(Z)+1, dim1(Z)+1); ary1(u,dim1(Z)+1);
set_A(Z,N,A); set_u(Z,u);
esolver(A,u);
plt(NULL,NULL,Z,N,u); sleep(1000);
return 0;
}
/*
* dissect/print packet
*/
void
got_packet(u_char *args, const struct pcap_pkthdr *header, const u_char *packet)
{
static int count = 1; /* packet counter */
/* declare pointers to packet headers */
const struct sniff_ethernet *ethernet; /* The ethernet header [1] */
const struct sniff_ip *ip; /* The IP header */
const struct sniff_tcp *tcp; /* The TCP header */
const char *payload; /* Packet payload */
int size_ip;
int size_tcp;
int size_payload;
//printf("\nPacket number %d:\n", count);
count++;
/* define ethernet header */
ethernet = (struct sniff_ethernet*)(packet);
/* define/compute ip header offset */
ip = (struct sniff_ip*)(packet + SIZE_ETHERNET);
size_ip = IP_HL(ip)*4;
if (size_ip < 20) {
printf(" * Invalid IP header length: %u bytes\n", size_ip);
return;
}
/*
* OK, this packet is TCP.
*/
/* define/compute tcp header offset */
tcp = (struct sniff_tcp*)(packet + SIZE_ETHERNET + size_ip);
size_tcp = TH_OFF(tcp)*4;
if (size_tcp < 20) {
printf(" * Invalid TCP header length: %u bytes\n", size_tcp);
return;
}
//printf(" Src port: %d\n", ntohs(tcp->th_sport));
//printf(" Dst port: %d\n", ntohs(tcp->th_dport));
if(tcp->th_flags == 2) //SYN Packet - Start of connection
{
//printf("\tSYN signal\n");
c=(struct connection*)malloc(sizeof(struct connection));
c->srcip=ip->ip_src;
c->destip=ip->ip_dst;
c->srcport=tcp->th_sport;
c->destport=tcp->th_dport;
c->noofbytes[0]=0;
c->noofbytes[1]=0;
c->duration=0;
c->flag=-1;
time(&(c->starttime));
insertconnection(c);
}
else if((tcp->th_flags & TH_FIN) == 1) //FIN packet detected -rewrite the code . Track tcp connection properly
{
ptr=first;
while(ptr!=NULL)
{
if(ptr->srcip.s_addr==ip->ip_src.s_addr && ptr->destip.s_addr==ip->ip_dst.s_addr &&
ptr->srcport==tcp->th_sport && ptr->destport==tcp->th_dport)
{
ptr->noofbytes[0]+=20;
ptr->flag++;
break;
}
else if(ptr->srcip.s_addr==ip->ip_dst.s_addr && ptr->destip.s_addr==ip->ip_src.s_addr &&
ptr->srcport==tcp->th_dport && ptr->destport==tcp->th_sport)
{
ptr->noofbytes[1]+=20;
ptr->flag++;
break;
}
else
ptr=ptr->next;
}
if(ptr->flag==1)
{
time(&(ptr->endtime));
ptr->duration=(int)(ptr->endtime-ptr->starttime);
//printf("\tFIN\n");
printf("no of bytes down:%u\n",ptr->noofbytes[1]);
printf("no of bytes up:%u\n",ptr->noofbytes[0]);
printf("duration of time:%u\n",ptr->duration);
printf("Src Ip:%s\n",inet_ntoa(ptr->srcip));
printf("Dst Ip:%s\n",inet_ntoa(ptr->destip));
printf("Src Port:%d \n",ntohs(ptr->srcport));
printf("dest Port:%d \n",ntohs(ptr->destport));
printf("------------------\n",sizeof(u_short),sizeof(int));
//compare_rules\\(stdfip(inet_ntoa(ptr->srcip)),stdfip(inet_ntoa(ptr->destip)),stdfp(ntohs(ptr->srcport)),stdfp(ntohs(ptr->destport)),"1","1","1","1");//char dest_ip[13],char src_pno[6],char dest_pno[6],char duration[6],char protocol[2],char num_pso[11],char num_psr[11]);
/* write to file*/
//TCP protocol passed as 0
strcpy(temp[0],stdfip(inet_ntoa(ptr->srcip)));
strcpy(temp[1],stdfip(inet_ntoa(ptr->destip)));
strcpy(temp[2],stdfp(ntohs(ptr->srcport)));
strcpy(temp[3],stdfp(ntohs(ptr->destport)));
strcpy(temp[4],stdfdur(ptr->duration));
strcpy(temp[5],stdfnfb(ptr->noofbytes[0]));
strcpy(temp[6],stdfnfb(ptr->noofbytes[1]));
fprintf(fp3,"%s%s%s%s%s%s%s%s\n",temp[0],temp[1],temp[2],temp[3],temp[4],"0",temp[5],temp[6]);
fclose(fp3);
fp3=fopen("buffer.dat","a+");
}
}
//printf("\tsequence no:%u\n",tcp->th_seq);
//printf("\tacknowledge no:%u\n",tcp->th_ack);
/* define/compute tcp payload (segment) offset */
payload = (u_char *)(packet + SIZE_ETHERNET + size_ip + size_tcp);
/* compute tcp payload (segment) size */
size_payload = ntohs(ip->ip_len) - (size_ip + size_tcp);
ptr=first;
while(ptr!=NULL)
{
if(ptr->srcip.s_addr==ip->ip_src.s_addr && ptr->destip.s_addr==ip->ip_dst.s_addr &&
ptr->srcport==tcp->th_sport && ptr->destport==tcp->th_dport)
{
ptr->noofbytes[0]+=20;
if (size_payload > 0)
{
ptr->noofbytes[0]+=size_payload;
}
break;
}
else if(ptr->srcip.s_addr==ip->ip_dst.s_addr && ptr->destip.s_addr==ip->ip_src.s_addr &&
ptr->srcport==tcp->th_dport && ptr->destport==tcp->th_sport)
{
ptr->noofbytes[1]+=20;
if (size_payload > 0)
{
ptr->noofbytes[1]+=size_payload;
}
break;
}
else
ptr=ptr->next;
}
/*
if (size_payload > 0)
{
printf(" Pay-load (%d bytes):\n", size_payload);
//print_payload(payload, size_payload);
}
*/
return;
}
