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#include <netdb.h>
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "__dns.h"
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 buf[256];
unsigned char reply[512];
int af = sa->sa_family;
unsigned char *a;
switch (af) {
case AF_INET:
a = (void *)&((struct sockaddr_in *)sa)->sin_addr;
if (sl != sizeof(struct sockaddr_in)) return EAI_FAMILY;
break;
case AF_INET6:
a = (void *)&((struct sockaddr_in6 *)sa)->sin6_addr;
if (sl != sizeof(struct sockaddr_in6)) return EAI_FAMILY;
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)
{
if (flags & NI_NAMEREQD) return EAI_NONAME;
inet_ntop(af, a, buf, sizeof buf);
}
if (strlen(buf) >= nodelen) return EAI_OVERFLOW;
strcpy(node, buf);
}
if (serv && servlen) {
if (snprintf(buf, sizeof buf, "%d",
ntohs(((struct sockaddr_in *)sa)->sin_port))>=servlen)
return EAI_OVERFLOW;
strcpy(serv, buf);
}
return 0;
}
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