diff options
Diffstat (limited to 'src/network/getnameinfo.c')
-rw-r--r-- | src/network/getnameinfo.c | 59 |
1 files changed, 53 insertions, 6 deletions
diff --git a/src/network/getnameinfo.c b/src/network/getnameinfo.c index 33f89a38..dfcf6eda 100644 --- a/src/network/getnameinfo.c +++ b/src/network/getnameinfo.c @@ -5,15 +5,50 @@ #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> -#include "__dns.h" + +int __dns_parse(const unsigned char *, int, int (*)(void *, int, const void *, int, const void *), void *); +int __dn_expand(const unsigned char *, const unsigned char *, const unsigned char *, char *, int); +int __res_mkquery(int, const char *, int, int, const unsigned char *, int, const unsigned char*, unsigned char *, int); +int __res_send(const unsigned char *, int, unsigned char *, int); + +#define PTR_MAX (64 + sizeof ".in-addr.arpa") +#define RR_PTR 12 + +static void mkptr4(char *s, const unsigned char *ip) +{ + sprintf(s, "%d.%d.%d.%d.in-addr.arpa", + ip[3], ip[2], ip[1], ip[0]); +} + +static void mkptr6(char *s, const unsigned char *ip) +{ + static const char xdigits[] = "0123456789abcdef"; + int i; + for (i=15; i>=0; i--) { + *s++ = xdigits[ip[i]&15]; *s++ = '.'; + *s++ = xdigits[ip[i]>>4]; *s++ = '.'; + } + strcpy(s, "ip6.arpa"); +} + +static int dns_parse_callback(void *c, int rr, const void *data, int len, const void *packet) +{ + char tmp[256]; + if (rr != RR_PTR) return 0; + if (__dn_expand(packet, (const unsigned char *)packet + 512, + data, tmp, sizeof tmp) > 0) + strcpy(c, tmp); + return 0; + +} int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl, char *restrict node, socklen_t nodelen, char *restrict serv, socklen_t servlen, int flags) { + char ptr[PTR_MAX]; char buf[256]; - unsigned char reply[512]; int af = sa->sa_family; unsigned char *a; @@ -21,20 +56,32 @@ int getnameinfo(const struct sockaddr *restrict sa, socklen_t sl, case AF_INET: a = (void *)&((struct sockaddr_in *)sa)->sin_addr; if (sl != sizeof(struct sockaddr_in)) return EAI_FAMILY; + mkptr4(ptr, a); break; case AF_INET6: a = (void *)&((struct sockaddr_in6 *)sa)->sin6_addr; if (sl != sizeof(struct sockaddr_in6)) return EAI_FAMILY; + if (memcmp(a, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12)) + mkptr6(ptr, a); + else + mkptr4(ptr, a+12); break; default: return EAI_FAMILY; } if (node && nodelen) { - if ((flags & NI_NUMERICHOST) - || __dns_query(reply, a, af, 1) <= 0 - || __dns_get_rr(buf, 0, 256, 1, reply, RR_PTR, 1) <= 0) - { + buf[0] = 0; + if (!(flags & NI_NUMERICHOST)) { + unsigned char query[18+PTR_MAX], reply[512]; + int qlen = __res_mkquery(0, ptr, 1, RR_PTR, + 0, 0, 0, query, sizeof query); + int rlen = __res_send(query, qlen, reply, sizeof reply); + buf[0] = 0; + if (rlen > 0) + __dns_parse(reply, rlen, dns_parse_callback, buf); + } + if (!*buf) { if (flags & NI_NAMEREQD) return EAI_NONAME; inet_ntop(af, a, buf, sizeof buf); } |