- 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, no name can be longer than this.
- char *name = dst[i]->name;
-
- _idx = parse_dns_name (name, data, idx);
- dst[i]->namelen = _idx - idx;
-
- dst[i]->name = GNUNET_malloc (dst[i]->namelen);
- memcpy (dst[i]->name, name, dst[i]->namelen);
-
- 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;
-} /*}}} */
-
-/**
- * Parse a raw DNS-Packet into an usable struct
- */
-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 */
-
- /* Parse the Query */
- 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);
- memcpy (ppkt->queries[i]->name, name, ppkt->queries[i]->namelen);
-
- 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;
-} /*}}} */
-
-static void
-unparse_dns_name (char *dest, char *src, size_t len)
-{
- char *b = dest;
- char cnt = 0;
-
- dest++;
- while (*src != 0)
- {
- while (*src != '.' && *src != 0)
- {
- *dest = *src;
- src++;
- dest++;
- cnt++;
- }
- *b = cnt;
- cnt = 0;
- b = dest;
- dest++;
- src++;
- }
- *b = 0;
-}
-
-struct dns_pkt *
-unparse_dns_packet (struct dns_pkt_parsed *ppkt)
-{
- size_t size = sizeof (struct dns_pkt) - 1;
- int i;
-
- for (i = 0; i < ntohs (ppkt->s.qdcount); i++)
- size += ppkt->queries[i]->namelen + 1;
-
- for (i = 0; i < ntohs (ppkt->s.ancount); i++)
- {
- size += ppkt->answers[i]->namelen + 1;
- size += ppkt->answers[i]->data_len;
- }
- for (i = 0; i < ntohs (ppkt->s.nscount); i++)
- {
- size += ppkt->nameservers[i]->namelen + 1;
- size += ppkt->nameservers[i]->data_len;
- }
- for (i = 0; i < ntohs (ppkt->s.arcount); i++)
- {
- size += ppkt->additional[i]->namelen + 1;
- size += ppkt->additional[i]->data_len;
- }
-
- size +=
- 4 * ntohs (ppkt->s.qdcount) + 10 * (ntohs (ppkt->s.ancount) +
- ntohs (ppkt->s.arcount) +
- ntohs (ppkt->s.nscount));
-
- struct dns_pkt *pkt = GNUNET_malloc (size);
- char *pkt_c = (char *) pkt;
-
- memcpy (&pkt->s, &ppkt->s, sizeof ppkt->s);
- size_t idx = sizeof ppkt->s;
-
- for (i = 0; i < ntohs (ppkt->s.qdcount); i++)
- {
- unparse_dns_name (&pkt_c[idx], ppkt->queries[i]->name,
- ppkt->queries[i]->namelen);
- idx += ppkt->queries[i]->namelen;
- struct dns_query_line *d = (struct dns_query_line *) &pkt_c[idx];
-
- d->class = ppkt->queries[i]->qclass;
- d->type = ppkt->queries[i]->qtype;
- idx += sizeof (struct dns_query_line);
- }
-
- for (i = 0; i < ntohs (ppkt->s.ancount); i++)
- {
- unparse_dns_name (&pkt_c[idx], ppkt->answers[i]->name,
- ppkt->answers[i]->namelen);
- idx += ppkt->answers[i]->namelen;
- struct dns_record_line *r = (struct dns_record_line *) &pkt_c[idx];
-
- r->type = ppkt->answers[i]->type;
- r->class = ppkt->answers[i]->class;
- r->ttl = ppkt->answers[i]->ttl;
- r->data_len = ppkt->answers[i]->data_len;
- idx += sizeof (struct dns_record_line);
- memcpy (&r->data, ppkt->answers[i]->data, ppkt->answers[i]->data_len);
- idx += ppkt->answers[i]->data_len;
- }
-
- for (i = 0; i < ntohs (ppkt->s.nscount); i++)
- {
- unparse_dns_name (&pkt_c[idx], ppkt->nameservers[i]->name,
- ppkt->nameservers[i]->namelen);
- idx += ppkt->nameservers[i]->namelen;
- struct dns_record_line *r = (struct dns_record_line *) &pkt_c[idx];
-
- r->type = ppkt->nameservers[i]->type;
- r->class = ppkt->nameservers[i]->class;
- r->ttl = ppkt->nameservers[i]->ttl;
- r->data_len = ppkt->nameservers[i]->data_len;
- idx += sizeof (struct dns_record_line);
- memcpy (&r->data, ppkt->nameservers[i]->data,
- ppkt->nameservers[i]->data_len);
- idx += ppkt->nameservers[i]->data_len;
- }
-
- for (i = 0; i < ntohs (ppkt->s.arcount); i++)
projects / oweals / gnunet.git / blobdiff