//make import info into struct baseinfo
void
passer_dns_data(mbuf_type *mbuf)
{
uchar *buf = mbuf->buf;
int num;
int dlen = 0;
uchar *tail = NULL;
dnsheader *hdr = (dnsheader *) buf;
mbuf->err = 1;
num = ntohs(hdr->qdcount);
if (num != 1)
return;
num = ntohs(hdr->ancount);
if (num != 0)
return;
num = ntohs(hdr->nscount);
if (num != 0)
return ;
num = ntohs(hdr->arcount);
if (num > 1) //edns makes ar==1
return;
mbuf->id = hdr->id;
dlen = check_dns_name(buf + sizeof(dnsheader), &(mbuf->lowerdomain));
if (dlen < 0)
{
return;
}
mbuf->dlen = dlen;
tail = mbuf->origindomain = buf + sizeof(dnsheader);
if (dlen == 2) // root
tail += 1;
else
tail += dlen;
mbuf->qtype = ntohs(*(ushort *) tail);
if (check_support_type(mbuf->qtype) == 0)
mbuf->err = 0;
return;
}
//make import info into struct baseinfo
struct baseinfo passer_dns_data(struct sockinfo *si)
{
uchar *buf = si->buf;
int num;
int i = 0,len = sizeof(struct sockaddr_in);
int dlen = 0,seg = 0;
struct baseinfo bi;
uchar *tail = NULL,*ptrs[MAX_NS_LVL] = {0},*domain = NULL;
ushort offset;
dnsheader *hdr = (dnsheader*)buf;
bi.err = 1;
num = ntohs(hdr->qdcount);
if(num != 1)
return bi;
num = ntohs(hdr->ancount);
if(num != 0)
return bi;
num = ntohs(hdr->nscount);
if(num != 0)
return bi;
num = ntohs(hdr->arcount);
if(num > 1) //edns makes ar==1
return bi;
bi.id = hdr->id;
//if(check_client_addr() < 0)
//return bi;
dlen = check_dns_name(buf + sizeof(dnsheader),&seg);
if(dlen < 0)
return bi;
bi.dlen = dlen;
tail = bi.origindomain = buf + sizeof(dnsheader);
tail += dlen;
bi.type = ntohs(*(ushort*)tail);
if(check_support_type(bi.type) == 0)
bi.err = 0;
return bi;
}
