--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/osdep/nt/ip4_nt.c	Mon Sep 14 15:17:45 2009 +0900
@@ -0,0 +1,184 @@
+/* ========================================================================
+ * Copyright 1988-2006 University of Washington
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 
+ * ========================================================================
+ */
+
+/*
+ * Program:	UNIX IPv4 routines
+ *
+ * Author:	Mark Crispin
+ *		Networks and Distributed Computing
+ *		Computing & Communications
+ *		University of Washington
+ *		Administration Building, AG-44
+ *		Seattle, WA  98195
+ *		Internet: MRC@CAC.Washington.EDU
+ *
+ * Date:	18 December 2003
+ * Last Edited:	30 August 2006
+ */
+
+#define SADRLEN sizeof (struct sockaddr)
+
+#define SADR4(sadr) ((struct sockaddr_in *) sadr)
+#define SADR4LEN sizeof (struct sockaddr_in)
+#define SADR4ADR(sadr) SADR4 (sadr)->sin_addr
+#define ADR4LEN sizeof (struct in_addr)
+#define SADR4PORT(sadr) SADR4 (sadr)->sin_port
+
+
+/* IP abstraction layer */
+
+char *ip_sockaddrtostring (struct sockaddr *sadr);
+long ip_sockaddrtoport (struct sockaddr *sadr);
+void *ip_stringtoaddr (char *text,size_t *len,int *family);
+struct sockaddr *ip_newsockaddr (size_t *len);
+struct sockaddr *ip_sockaddr (int family,void *adr,size_t adrlen,
+			      unsigned short port,size_t *len);
+char *ip_sockaddrtoname (struct sockaddr *sadr);
+void *ip_nametoaddr (char *name,size_t *len,int *family,char **canonical,
+		     void **next);
+
+/* Return IP address string from socket address
+ * Accepts: socket address
+ * Returns: IP address as name string
+ */
+
+char *ip_sockaddrtostring (struct sockaddr *sadr)
+{
+  return (sadr->sa_family == PF_INET) ?
+    inet_ntoa (SADR4ADR (sadr)) : "NON-IPv4";
+}
+
+
+/* Return port from socket address
+ * Accepts: socket address
+ * Returns: port number or -1 if can't determine it
+ */
+
+long ip_sockaddrtoport (struct sockaddr *sadr)
+{
+  return (sadr->sa_family == PF_INET) ? ntohs (SADR4PORT (sadr)) : -1;
+}
+
+
+/* Return IP address from string
+ * Accepts: name string
+ *	    pointer to returned length
+ *	    pointer to returned address family
+ * Returns: address if valid, length and family updated, or NIL
+ */
+
+void *ip_stringtoaddr (char *text,size_t *len,int *family)
+{
+  unsigned long adr;
+  struct in_addr *ret;
+				/* get address */
+  if ((adr = inet_addr (text)) == -1) ret = NIL;
+  else {			/* make in_addr */
+    ret = (struct in_addr *) fs_get (*len = ADR4LEN);
+    *family = AF_INET;		/* IPv4 */
+    ret->s_addr = adr;		/* set address */
+  }
+  return (void *) ret;
+}
+
+/* Create a maximum-size socket address
+ * Accepts: pointer to return maximum socket address length
+ * Returns: new, empty socket address of maximum size
+ */
+
+struct sockaddr *ip_newsockaddr (size_t *len)
+{
+  return (struct sockaddr *) memset (fs_get (SADRLEN),0,*len = SADRLEN);
+}
+
+
+/* Stuff a socket address
+ * Accepts: address family
+ *	    IPv4 address
+ *	    length of address (always 4 in IPv4)
+ *	    port number
+ *	    pointer to return socket address length
+ * Returns: socket address or NIL if error
+ */
+
+struct sockaddr *ip_sockaddr (int family,void *adr,size_t adrlen,
+			      unsigned short port,size_t *len)
+{
+  struct sockaddr *sadr = ip_newsockaddr (len);
+  switch (family) {		/* build socket address based upon family */
+  case AF_INET:			/* IPv4 */
+    sadr->sa_family = PF_INET;
+				/* copy host address */
+    memcpy (&SADR4ADR (sadr),adr,adrlen);
+				/* copy port number in network format */
+    SADR4PORT (sadr) = htons (port);
+    *len = SADR4LEN;
+    break;
+  default:			/* non-IP?? */
+    sadr->sa_family = PF_UNSPEC;
+    break;
+  }
+  return sadr;
+}
+
+/* Return name from socket address
+ * Accepts: socket address
+ * Returns: canonical name for that address or NIL if none
+ */
+
+char *ip_sockaddrtoname (struct sockaddr *sadr)
+{
+  struct hostent *he;
+  return ((sadr->sa_family == PF_INET) &&
+	  (he = gethostbyaddr ((char *) &SADR4ADR (sadr),ADR4LEN,AF_INET))) ?
+    (char *) he->h_name : NIL;
+}
+
+
+/* Return address from name
+ * Accepts: name or NIL to return next address
+ *	    pointer to previous/returned length
+ *	    pointer to previous/returned address family
+ *	    pointer to previous/returned canonical name
+ *	    pointer to previous/return state for next-address calls
+ * Returns: address with length/family/canonical updated if needed, or NIL
+ */
+
+void *ip_nametoaddr (char *name,size_t *len,int *family,char **canonical,
+		     void **next)
+{
+  char **adl,tmp[MAILTMPLEN];
+  struct hostent *he;
+  if (name) {			/* first lookup? */
+				/* yes, do case-independent lookup */
+    if ((strlen (name) < MAILTMPLEN) &&
+	(he = gethostbyname (lcase (strcpy (tmp,name))))) {
+      adl = he->h_addr_list;
+      if (len) *len = he->h_length;
+      if (family) *family = he->h_addrtype;
+      if (canonical) *canonical = (char *) he->h_name;
+      if (next) *next = (void *) adl;
+    }
+    else {			/* error */
+      adl = NIL;
+      if (len) *len = 0;
+      if (family) *family = 0;
+      if (canonical) *canonical = NIL;
+      if (next) *next = NIL;
+    }
+  }
+				/* return next in series */
+  else if (next && (adl = (char **) *next)) *next = ++adl;
+  else adl = NIL;		/* failure */
+  return adl ? (void *) *adl : NIL;
+}