1 files changed, 54 insertions, 0 deletions
diff --git a/src/network/getnameinfo.c b/src/network/getnameinfo.c
new file mode 100644
index 00000000..0763ca88
--- /dev/null
+++ b/src/network/getnameinfo.c
@@ -0,0 +1,54 @@
+#include <netdb.h>
+#include <limits.h>
+#include <stdlib.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 *sa, socklen_t sl,
+	char *node, socklen_t nodelen,
+	char *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;
+}