1 files changed, 88 insertions, 0 deletions
diff --git a/libmailutils/sockaddr/ipaddr.c b/libmailutils/sockaddr/ipaddr.c
new file mode 100644
index 000000000..6b14b4c29
--- /dev/null
+++ b/libmailutils/sockaddr/ipaddr.c
@@ -0,0 +1,88 @@
+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General
+   Public License along with this library.  If not, see 
+   <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <string.h>
+#include <mailutils/sockaddr.h>
+#include <mailutils/cctype.h>
+
+int 
+mu_str_is_ipv4 (const char *addr)
+{
+  int dot_count = 0;
+  int digit_count = 0;
+
+  for (; *addr; addr++)
+    {
+      if (!mu_isascii (*addr))
+	return 0;
+      if (*addr == '.')
+	{
+	  if (++dot_count > 3)
+	    break;
+	  digit_count = 0;
+	}
+      else if (!(mu_isdigit (*addr) && ++digit_count <= 3))
+	return 0;
+    }
+
+  return (dot_count == 3);
+}
+
+int 
+mu_str_is_ipv6 (const char *addr)
+{
+  int col_count = 0; /* Number of colons */
+  int dcol = 0;      /* Did we encounter a double-colon? */
+  int dig_count = 0; /* Number of digits in the last group */
+	
+  for (; *addr; addr++)
+    {
+      if (!mu_isascii (*addr))
+	return 0;
+      else if (mu_isxdigit (*addr))
+	{
+	  if (++dig_count > 4)
+	    return 0;
+	}
+      else if (*addr == ':')
+	{
+	  if (col_count && dig_count == 0 && ++dcol > 1)
+	    return 0;
+	  if (++col_count > 7)
+	    return 0;
+	  dig_count = 0;
+	}
+      else
+	return 0;
+    }
+  
+  return (col_count == 7 || dcol);
+}
+
+int
+mu_str_is_ipaddr (const char *addr)
+{
+  if (strchr (addr, '.'))
+    return mu_str_is_ipv4(addr);
+  else if (strchr (addr, ':'))
+    return mu_str_is_ipv6(addr);
+  return 0;
+}