Add checks for nmap.address_family == "inet" to scripts that require

that. Patch by Henri Doreau.

scripts/dhcp-discover.nse

@@ -67,7 +67,14 @@ require 'shortport'
 require 'stdnse'
 
 -- We want to run against a specific host if UDP/67 is open
-portrule = shortport.portnumber(67, "udp")
+function portrule(host, port)
+	if nmap.address_family() ~= 'inet' then
+		stdnse.print_debug("%s is IPv4 compatible only.", SCRIPT_NAME)
+		return false
+	end
+
+	return shortport.portnumber(67, "udp")(host, port)
+end
 
 -- We will want to run as a prerule any time
 --prerule  = function()

scripts/firewalk.nse

@@ -57,7 +57,9 @@ firewalk tool.
 --
 
 
--- 12/29/2010: initial version
+-- 11/29/2010: initial version
+-- 03/28/2011: added IPv4 check
+
 author = "Henri Doreau"
 
 license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
@@ -422,6 +424,11 @@ hostrule = function(host)
     return false
   end
 
+  if nmap.address_family() ~= 'inet' then
+    stdnse.print_debug("%s is IPv4 compatible only.", SCRIPT_NAME)
+    return false
+  end
+
   if not host.interface then
     return false
   end

scripts/ipidseq.nse

@@ -30,6 +30,7 @@ categories = {"safe", "discovery"}
 
 require 'bin'
 require 'packet'
+require 'nmap'
 require 'stdnse'
 
 local NUMPROBES = 6
@@ -198,6 +199,10 @@ hostrule = function(host)
 		end
 		return false
 	end
+	if nmap.address_family() ~= 'inet' then
+		stdnse.print_debug("%s is IPv4 compatible only.", SCRIPT_NAME)
+		return false
+	end
 	if not host.interface then
 		return false
 	end

scripts/path-mtu.nse

@@ -38,6 +38,7 @@ categories = {"safe", "discovery"}
 
 require 'bin'
 require 'packet'
+require 'nmap'
 require 'stdnse'
 
 local IPPROTO_ICMP = packet.IPPROTO_ICMP
@@ -279,6 +280,10 @@ hostrule = function(host)
 		end
 		return false
 	end
+	if nmap.address_family() ~= 'inet' then
+		stdnse.print_debug("%s is IPv4 compatible only.", SCRIPT_NAME)
+		return false
+	end
 	if not (host.interface and host.interface_mtu) then
 		return false
 	end

scripts/qscan.nse

@@ -53,6 +53,7 @@ require 'stdnse'
 require 'bin'
 require 'packet'
 require 'tab'
+require 'nmap'
 
 -- defaults
 local DELAY = 0.200
@@ -378,6 +379,10 @@ hostrule = function(host)
 		end
 		return false
 	end
+	if nmap.address_family() ~= 'inet' then
+		stdnse.print_debug("%s is IPv4 compatible only.", SCRIPT_NAME)
+		return false
+	end
 	if not host.interface then
 		return false
 	end

scripts/sniffer-detect.nse

@@ -17,6 +17,10 @@ categories = {"discovery", "intrusive"}
 
 -- okay, we're interested only in hosts that are on our ethernet lan
 hostrule = function(host)
+	if nmap.address_family() ~= 'inet' then
+		stdnse.print_debug("%s is IPv4 compatible only.", SCRIPT_NAME)
+		return false
+	end
 	return host.directly_connected == true and
 		host.mac_addr ~= nil and
 		host.mac_addr_src ~= nil and