int resource_from_network(dns_resource_t * resource, char * buff, int max_size,
char* full_msg) {
char * c = buff;
int tmp;
tmp = get_NAME_from_net(resource->NAME, buff, max_size, full_msg);
if (tmp < 0)
return -1;
max_size -= tmp;
buff += tmp;
if(max_size < 2)
return -1;
resource->TYPE = get_uint16_t(buff);
buff += 2;
max_size -= 2;
if(max_size < 2)
return -1;
resource->CLASS = get_uint16_t(buff);
buff += 2;
max_size -= 2;
if(max_size < 4)
return -1;
resource->TTL = get_uint32_t(buff);
buff += 4;
max_size -= 4;
if(max_size < 2)
return -1;
resource->RDLENGTH = get_uint16_t(buff);
buff += 2;
max_size -= 2;
int i;
if(resource->TYPE != TYPE_PTR) {
for (i = 0; i < resource->RDLENGTH; ++i) {
if(max_size == 0)
return -1;
resource->RDATA[i] = *buff;
buff++;
max_size--;
}
}
else {
get_NAME_from_net(resource->RDATA,buff, max_size, full_msg);
buff += resource->RDLENGTH;
}
return buff - c;
}
int header_from_network(dns_header_t * header, char * buff, int max_size) {
if (max_size < 12)
return -1;
int i;
for(i = 0; i < 6; ++i) {
(header->h)[i] = get_uint16_t(buff);
buff += 2;
}
(header->h)[0] = (header->h)[0];
return 12;
}
int question_from_network(dns_question_t * question, char * buff, int max_size,
char * full_msg){
char * tmp = buff;
question->qname_length = get_NAME_from_net(question->QNAME, buff, max_size,
full_msg);
if (question->qname_length < 0)
return -1;
max_size -= question->qname_length;
buff += question->qname_length;
if(max_size < 2)
return -1;
question->QTYPE = get_uint16_t(buff);
buff += 2;
max_size -= 2;
if(max_size < 2)
return -1;
question->QCLASS = get_uint16_t(buff);
buff += 2;
max_size -= 2;
return buff - tmp;
}
void pack_value(char* payload,int wlength,int offset, char* port_value)
{
char* ptr = payload + (offset*wlength/8);
char* ss = NULL;
switch(wlength)
{
case 8:
*((uint8_t*)ptr) = get_uint8_t(port_value,&ss);
break;
case 16:
*((uint16_t*)ptr) = get_uint16_t(port_value,&ss);
break;
case 32:
*((uint32_t*)ptr) = get_uint32_t(port_value,&ss);
break;
case 64:
*((uint64_t*)ptr) = get_uint64_t(port_value,&ss);
break;
default:
fprintf(stderr,"Error: unsupported data width %d\n", wlength);
return;
}
}
