5 #include <sys/socket.h>
6 #include <netinet/in.h>
9 int __dns_parse(const unsigned char *, int, int (*)(void *, int, const void *, int, const void *), void *);
10 int __dn_expand(const unsigned char *, const unsigned char *, const unsigned char *, char *, int);
11 int __res_mkquery(int, const char *, int, int, const unsigned char *, int, const unsigned char*, unsigned char *, int);
12 int __res_send(const unsigned char *, int, unsigned char *, int);
14 #define PTR_MAX (64 + sizeof ".in-addr.arpa")
17 static void mkptr4(char *s, const unsigned char *ip)
19 sprintf(s, "%d.%d.%d.%d.in-addr.arpa",
20 ip[3], ip[2], ip[1], ip[0]);
23 static void mkptr6(char *s, const unsigned char *ip)
25 static const char xdigits[] = "0123456789abcdef";
27 for (i=15; i>=0; i--) {
28 *s++ = xdigits[ip[i]&15]; *s++ = '.';
29 *s++ = xdigits[ip[i]>>4]; *s++ = '.';
31 strcpy(s, "ip6.arpa");
34 static int dns_parse_callback(void *c, int rr, const void *data, int len, const void *packet)
37 if (rr != RR_PTR) return 0;
38 if (__dn_expand(packet, (const unsigned char *)packet + 512,
39 data, tmp, sizeof tmp) > 0)
45 int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl,
46 char *restrict node, socklen_t nodelen,
47 char *restrict serv, socklen_t servlen,
52 int af = sa->sa_family;
57 a = (void *)&((struct sockaddr_in *)sa)->sin_addr;
58 if (sl != sizeof(struct sockaddr_in)) return EAI_FAMILY;
62 a = (void *)&((struct sockaddr_in6 *)sa)->sin6_addr;
63 if (sl != sizeof(struct sockaddr_in6)) return EAI_FAMILY;
64 if (memcmp(a, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12))
73 if (node && nodelen) {
75 if (!(flags & NI_NUMERICHOST)) {
76 unsigned char query[18+PTR_MAX], reply[512];
77 int qlen = __res_mkquery(0, ptr, 1, RR_PTR,
78 0, 0, 0, query, sizeof query);
79 int rlen = __res_send(query, qlen, reply, sizeof reply);
82 __dns_parse(reply, rlen, dns_parse_callback, buf);
85 if (flags & NI_NAMEREQD) return EAI_NONAME;
86 inet_ntop(af, a, buf, sizeof buf);
88 if (strlen(buf) >= nodelen) return EAI_OVERFLOW;
92 if (serv && servlen) {
93 if (snprintf(buf, sizeof buf, "%d",
94 ntohs(((struct sockaddr_in *)sa)->sin_port))>=servlen)