1 #include "dns.h"
2
3 /** Request the name (PTR) record for an IPv6 address. */
dns_name6_r(struct dns_transmit * tx,struct dns_result * out,const ipv6addr * ip)4 int dns_name6_r(struct dns_transmit *tx, struct dns_result* out, const ipv6addr* ip)
5 {
6 char name[DNS_NAME6_DOMAIN];
7
8 if (ipv6_isv4mapped(ip))
9 return dns_name4_r(tx, out, (ipv4addr*)&ip->addr[12]);
10 dns_name6_domain(name,ip);
11 if (dns_resolve(tx,name,DNS_T_PTR) == -1) return -1;
12 if (dns_name_packet(out,tx->packet,tx->packetlen) == -1) return -1;
13 dns_transmit_free(tx);
14 return 0;
15 }
16
17 /** \fn dns_name6(struct dns_result*, const ipv6addr*)
18 Request the name (PTR) record for an IPv6 address.
19 */
DNS_R_FN_WRAP(name6,const ipv6addr *)20 DNS_R_FN_WRAP(name6, const ipv6addr*)
21
22 #ifdef SELFTEST_MAIN
23 #include "dns-responder.c"
24 DUMP {
25 int i;
26 for (i = 0; i < count; i++) {
27 obuf_putc(&outbuf, ' ');
28 obuf_puts(&outbuf, rr->name[i]);
29 }
30 NL();
31 }
32 RESPONSE responses[] = {
33 { 1, 1, 0, {
34 { "\300\014", 2, DNS_T_PTR, DNS_C_IN, 86400, "\003one\007example\003com\000", 17 },
35 { "\300\014", 2, DNS_T_NS, DNS_C_IN, 123456, "\003ns1\007example\003org\000", 17 },
36 }
37 },
38 { 1, 1, 0, {
39 { "\300\014", 2, DNS_T_PTR, DNS_C_IN, 86400, "\003two\007example\003com\000", 17 },
40 { "\300\014", 2, DNS_T_NS, DNS_C_IN, 123456, "\003ns1\007example\003com\000", 17 },
41 }
42 },
43 };
doit(const ipv6addr * addr)44 void doit(const ipv6addr* addr)
45 {
46 struct dns_result out = {0};
47 debugfn(dns_name6(&out, addr));
48 obuf_putf(&outbuf, "s{: count=}d{\n}", ipv6_format(addr), out.count);
49 dump_rrs(out.count, &out.rr);
50 obuf_flush(&outbuf);
51 }
52 MAIN
53 {
54 ipv6addr addr1 = {{ 0,1,2,3,4,5,6,7,8,9,0xa,0xb,0xc,0xd,0xe,0xf }};
55 ipv6addr addr2 = {{ 0,0,0,0,0,0,0,0,0,0,0xff,0xff,0xab,10,42,99 }};
56 start_dns_responder(responses, 2);
57 doit(&addr1);
58 doit(&addr2);
59 wait_dns_responder();
60 }
61 #endif
62 #ifdef SELFTEST_EXP
63 90: ID=XX QR=0 opcode=0 AA=0 TC=0 RD=1 RA=0 Z=0 RCODE=0 QDCOUNT=1 ANCOUNT=0 NSCOUNT=0 ARCOUNT=0
64 Question: f.0.e.0.d.0.c.0.b.0.a.0.9.0.8.0.7.0.6.0.5.0.4.0.3.0.2.0.1.0.0.0.ip6.arpa. QTYPE=12 QCLASS=1
65 result=0
66 1:203:405:607:809:a0b:c0d:e0f: count=1
67 one.example.com
68 43: ID=XX QR=0 opcode=0 AA=0 TC=0 RD=1 RA=0 Z=0 RCODE=0 QDCOUNT=1 ANCOUNT=0 NSCOUNT=0 ARCOUNT=0
69 Question: 99.42.10.171.in-addr.arpa. QTYPE=12 QCLASS=1
70 result=0
71 ::ffff:171.10.42.99: count=1
72 two.example.com
73 #endif
74