#include "platform.h"
#include "gnunet-dns-parser.h"
+#include "gnunet-vpn-packet.h"
-unsigned int parse_dns_name(unsigned char* d, const unsigned char* src, unsigned short idx) {/*{{{*/
- unsigned char* dest = d;
+unsigned int parse_dns_name(char* d, const unsigned char* src, unsigned short idx) {/*{{{*/
+ char* dest = d;
int len = src[idx++];
while (len != 0) {
return idx;
}
/*}}}*/
+
+unsigned short parse_dns_record(unsigned char* data, struct dns_record** dst, unsigned short count, unsigned short idx) {/*{{{*/
+ int i;
+ unsigned short _idx;
+ for (i = 0; i < count; i++) {
+ dst[i] = GNUNET_malloc(sizeof(struct dns_record));
+ dst[i]->name = alloca(255); // see RFC1035
+ char* name = dst[i]->name;
+
+ _idx = parse_dns_name(name, data, idx);
+ dst[i]->namelen = _idx - idx;
+ idx = _idx;
+
+ dst[i]->type = *((unsigned short*)(data+idx));
+ idx += 2;
+ dst[i]->class = *((unsigned short*)(data+idx));
+ idx += 2;
+ dst[i]->ttl = *((unsigned int*)(data+idx));
+ idx += 4;
+ dst[i]->data_len = *((unsigned short*)(data+idx));
+ idx += 2;
+ dst[i]->data = GNUNET_malloc(ntohs(dst[i]->data_len));
+ memcpy(dst[i]->data, data+idx, ntohs(dst[i]->data_len));
+ idx += ntohs(dst[i]->data_len);
+ }
+ return idx;
+}/*}}}*/
+
+struct dns_pkt_parsed* parse_dns_packet(struct dns_pkt* pkt) {/*{{{*/
+ struct dns_pkt_parsed* ppkt = GNUNET_malloc(sizeof(struct dns_pkt_parsed));
+ memcpy(&ppkt->s, &pkt->s, sizeof pkt->s);
+
+ unsigned short qdcount = ntohs(ppkt->s.qdcount);
+ unsigned short ancount = ntohs(ppkt->s.ancount);
+ unsigned short nscount = ntohs(ppkt->s.nscount);
+ unsigned short arcount = ntohs(ppkt->s.arcount);
+
+ ppkt->queries = GNUNET_malloc(qdcount*sizeof(struct dns_query*));
+ ppkt->answers = GNUNET_malloc(ancount*sizeof(struct dns_record*));
+ ppkt->nameservers = GNUNET_malloc(nscount*sizeof(struct dns_record*));
+ ppkt->additional = GNUNET_malloc(arcount*sizeof(struct dns_record*));
+
+ unsigned short idx = 0, _idx; /* This keeps track how far we have parsed the data */
+
+ int i;
+ for (i = 0; i < qdcount; i++) { /*{{{*/
+ ppkt->queries[i] = GNUNET_malloc(sizeof(struct dns_query));
+ char* name = alloca(255); /* see RFC1035, it can't be more than this. */
+
+ _idx = parse_dns_name(name, pkt->data, idx);
+ ppkt->queries[i]->namelen = _idx - idx;
+ idx = _idx;
+
+ ppkt->queries[i]->name = GNUNET_malloc(ppkt->queries[i]->namelen + 1);
+ memcpy(ppkt->queries[i]->name, name, ppkt->queries[i]->namelen + 1);
+
+ ppkt->queries[i]->qtype = *((unsigned short*)(pkt->data+idx));
+ idx += 2;
+ ppkt->queries[i]->qclass = *((unsigned short*)(pkt->data+idx));
+ idx += 2;
+ }
+ /*}}}*/
+ idx = parse_dns_record(pkt->data, ppkt->answers, ancount, idx);
+ idx = parse_dns_record(pkt->data, ppkt->nameservers, nscount, idx);
+ idx = parse_dns_record(pkt->data, ppkt->additional, arcount, idx);
+ return ppkt;
+}/*}}}*/