1 files changed, 131 insertions, 0 deletions
diff --git a/lib/util/util_net.c b/lib/util/util_net.c
new file mode 100644
index 0000000000..ee57e9dd23
--- /dev/null
+++ b/lib/util/util_net.c
@@ -0,0 +1,131 @@
+/* 
+   Unix SMB/CIFS implementation.
+   Samba utility functions
+   Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2008
+   Copyright (C) Andrew Tridgell 1992-1998
+   Copyright (C) Jeremy Allison 2001-2002
+   Copyright (C) Simo Sorce 2001
+   Copyright (C) Jim McDonough (jmcd@us.ibm.com)  2003.
+   Copyright (C) James J Myers 2003
+    
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program 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 General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "system/network.h"
+#include "system/locale.h"
+#include "system/filesys.h"
+
+/**
+ Interpret an internet address or name into an IP address in 4 byte form.
+**/
+_PUBLIC_ uint32_t interpret_addr(const char *str)
+{
+	struct hostent *hp;
+	uint32_t res;
+
+	if (str == NULL || *str == 0 ||
+	    strcmp(str,"0.0.0.0") == 0) {
+		return 0;
+	}
+	if (strcmp(str,"255.255.255.255") == 0) {
+		return 0xFFFFFFFF;
+	}
+	/* recognise 'localhost' as a special name. This fixes problems with
+	   some hosts that don't have localhost in /etc/hosts */
+	if (strcasecmp(str,"localhost") == 0) {
+		str = "127.0.0.1";
+	}
+
+	/* if it's in the form of an IP address then get the lib to interpret it */
+	if (is_ipaddress(str)) {
+		res = inet_addr(str);
+	} else {
+		/* otherwise assume it's a network name of some sort and use 
+			sys_gethostbyname */
+		if ((hp = sys_gethostbyname(str)) == 0) {
+			DEBUG(3,("sys_gethostbyname: Unknown host. %s\n",str));
+			return 0;
+		}
+
+		if(hp->h_addr == NULL) {
+			DEBUG(3,("sys_gethostbyname: host address is invalid for host %s\n",str));
+			return 0;
+		}
+		memcpy((char *)&res,(char *)hp->h_addr, 4);
+	}
+
+	if (res == (uint32_t)-1)
+		return(0);
+
+	return(res);
+}
+
+/**
+ A convenient addition to interpret_addr().
+**/
+_PUBLIC_ struct in_addr interpret_addr2(const char *str)
+{
+	struct in_addr ret;
+	uint32_t a = interpret_addr(str);
+	ret.s_addr = a;
+	return ret;
+}
+
+/**
+ Check if an IP is the 0.0.0.0.
+**/
+
+_PUBLIC_ bool is_zero_ip(struct in_addr ip)
+{
+	return ip.s_addr == 0;
+}
+
+/**
+ Are two IPs on the same subnet?
+**/
+
+_PUBLIC_ bool same_net(struct in_addr ip1, struct in_addr ip2, struct in_addr mask)
+{
+	uint32_t net1,net2,nmask;
+
+	nmask = ntohl(mask.s_addr);
+	net1  = ntohl(ip1.s_addr);
+	net2  = ntohl(ip2.s_addr);
+            
+	return((net1 & nmask) == (net2 & nmask));
+}
+
+/**
+ Return true if a string could be a pure IP address.
+**/
+
+_PUBLIC_ bool is_ipaddress(const char *str)
+{
+	bool pure_address = true;
+	int i;
+
+	if (str == NULL) return false;
+
+	for (i=0; pure_address && str[i]; i++)
+		if (!(isdigit((int)str[i]) || str[i] == '.'))
+			pure_address = false;
+
+	/* Check that a pure number is not misinterpreted as an IP */
+	pure_address = pure_address && (strchr(str, '.') != NULL);
+
+	return pure_address;
+}
+
+