From 92cbb3408551a7616d2c02f07d524e34fbdd843f Mon Sep 17 00:00:00 2001
From: Assar Westerlund <assar@sics.se>
Date: Sun, 18 Aug 1996 23:23:50 +0000
Subject: [PATCH] New function `inaddr2str' to convert an IP address into a
 verified hostname or a string of the form x.y.z.a

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@656 ec53bebd-3082-4978-b11e-865c3cabbd6b
---
 lib/roken/inaddr2str.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 lib/roken/roken.h      |  2 ++
 lib/roken/roken.h.in   |  2 ++
 3 files changed, 46 insertions(+)
 create mode 100644 lib/roken/inaddr2str.c

diff --git a/lib/roken/inaddr2str.c b/lib/roken/inaddr2str.c
new file mode 100644
index 000000000..39f0054bd
--- /dev/null
+++ b/lib/roken/inaddr2str.c
@@ -0,0 +1,42 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+RCSID("$Id$");
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#include <netdb.h>
+#include "roken.h"
+
+/*
+ * Get a verified name for `addr'.
+ * If unable to find it in the DNS, return x.y.z.a
+ */
+
+void
+inaddr2str(struct in_addr addr, char *s, size_t len)
+{
+  struct hostent *h;
+  char *p;
+
+  h = gethostbyaddr ((const char *)&addr, sizeof(addr), AF_INET);
+  if (h) {
+    h = gethostbyname (h->h_name);
+    if(h)
+      while ((p = *(h->h_addr_list)++))
+	if (memcmp (p, &addr, h->h_length) == 0) {
+	  strncpy (s, h->h_name, len);
+	  s[len - 1] = '\0';
+	  return;
+	}
+  }
+  strncpy (s, inet_ntoa (addr), len);
+  s[len - 1] = '\0';
+  return;
+}
diff --git a/lib/roken/roken.h b/lib/roken/roken.h
index 2b338bcbc..1bd3fc854 100644
--- a/lib/roken/roken.h
+++ b/lib/roken/roken.h
@@ -79,4 +79,6 @@ time_t tm2time (struct tm tm, int local);
 
 int verify_unix_user(char *user, char *password);
 
+void inaddr2str(struct in_addr addr, char *s, size_t len);
+
 #endif /*  __ROKEN_H__ */
diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index 2b338bcbc..1bd3fc854 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -79,4 +79,6 @@ time_t tm2time (struct tm tm, int local);
 
 int verify_unix_user(char *user, char *password);
 
+void inaddr2str(struct in_addr addr, char *s, size_t len);
+
 #endif /*  __ROKEN_H__ */