X-Git-Url: https://git.enpas.org/?a=blobdiff_plain;f=net%2Fdns.lua;h=61fb62e8e2f6855f5f2117bcb74f977b46dfe21e;hb=6d7a9cba5240a142b1a1e397e6248cf13c261cca;hp=41a0c536c5baf742666ada3c95a812e7bdeb4f51;hpb=5759ae0cb06d4296927ff2104ce533a2709e75cf;p=prosody.git

diff --git a/net/dns.lua b/net/dns.lua
index 41a0c536..61fb62e8 100644
--- a/net/dns.lua
+++ b/net/dns.lua
@@ -2,8 +2,6 @@
 -- This file is included with Prosody IM. It has modifications,
 -- which are hereby placed in the public domain.
 
--- public domain 20080404 lua@ztact.com
-
 
 -- todo: quick (default) header generation
 -- todo: nxdomain, error handling
@@ -15,7 +13,6 @@
 
 
 local socket = require "socket";
-local ztact = require "util.ztact";
 local timer = require "util.timer";
 
 local _, windows = pcall(require, "util.windows");
@@ -24,9 +21,50 @@ local is_windows = (_ and windows) or os.getenv("WINDIR");
 local coroutine, io, math, string, table =
       coroutine, io, math, string, table;
 
-local ipairs, next, pairs, print, setmetatable, tostring, assert, error, unpack =
-      ipairs, next, pairs, print, setmetatable, tostring, assert, error, unpack;
+local ipairs, next, pairs, print, setmetatable, tostring, assert, error, unpack, select, type=
+      ipairs, next, pairs, print, setmetatable, tostring, assert, error, unpack, select, type;
 
+local ztact = { -- public domain 20080404 lua@ztact.com
+	get = function(parent, ...)
+		local len = select('#', ...);
+		for i=1,len do
+			parent = parent[select(i, ...)];
+			if parent == nil then break; end
+		end
+		return parent;
+	end;
+	set = function(parent, ...)
+		local len = select('#', ...);
+		local key, value = select(len-1, ...);
+		local cutpoint, cutkey;
+
+		for i=1,len-2 do
+			local key = select (i, ...)
+			local child = parent[key]
+
+			if value == nil then
+				if child == nil then
+					return;
+				elseif next(child, next(child)) then
+					cutpoint = nil; cutkey = nil;
+				elseif cutpoint == nil then
+					cutpoint = parent; cutkey = key;
+				end
+			elseif child == nil then
+				child = {};
+				parent[key] = child;
+			end
+			parent = child
+		end
+
+		if value == nil and cutpoint then
+			cutpoint[cutkey] = nil;
+		else
+			parent[key] = value;
+			return value;
+		end
+	end;
+};
 local get, set = ztact.get, ztact.set;
 
 local default_timeout = 15;
@@ -122,29 +160,24 @@ resolver.timeout = default_timeout;
 
 local SRV_tostring;
 
+local function default_rr_tostring(rr)
+	local rr_val = rr.type and rr[rr.type:lower()];
+	if type(rr_val) ~= "string" then
+		return "<UNKNOWN RDATA TYPE>";
+	end
+	return rr_val;
+end
+
+local special_tostrings = {
+	LOC = resolver.LOC_tostring;
+	MX = function (rr) return string.format('%2i %s', rr.pref, rr.mx); end;
+	SRV = SRV_tostring;
+};
 
 local rr_metatable = {};   -- - - - - - - - - - - - - - - - - - -  rr_metatable
 function rr_metatable.__tostring(rr)
-	local s0 = string.format('%2s %-5s %6i %-28s', rr.class, rr.type, rr.ttl, rr.name);
-	local s1 = '';
-	if rr.type == 'A' then
-		s1 = ' '..rr.a;
-	elseif rr.type == 'MX' then
-		s1 = string.format(' %2i %s', rr.pref, rr.mx);
-	elseif rr.type == 'CNAME' then
-		s1 = ' '..rr.cname;
-	elseif rr.type == 'LOC' then
-		s1 = ' '..resolver.LOC_tostring(rr);
-	elseif rr.type == 'NS' then
-		s1 = ' '..rr.ns;
-	elseif rr.type == 'SRV' then
-		s1 = ' '..SRV_tostring(rr);
-	elseif rr.type == 'TXT' then
-		s1 = ' '..rr.txt;
-	else
-		s1 = ' <UNKNOWN RDATA TYPE>';
-	end
-	return s0..s1;
+	local rr_string = (special_tostrings[rr.type] or default_rr_tostring)(rr);
+	return string.format('%2s %-5s %6i %-28s %s', rr.class, rr.type, rr.ttl, rr.name, rr_string);
 end
 
 
@@ -438,6 +471,9 @@ function resolver:SRV(rr)    -- - - - - - - - - - - - - - - - - - - - - -  SRV
 	  rr.srv.target   = self:name();
 end
 
+function resolver:PTR(rr)
+	rr.ptr = self:name();
+end
 
 function SRV_tostring(rr)    -- - - - - - - - - - - - - - - - - - SRV_tostring
 	local s = rr.srv;
@@ -528,7 +564,7 @@ end
 
 function resolver:adddefaultnameservers()    -- - - - -  adddefaultnameservers
 	if is_windows then
-		if windows then
+		if windows and windows.get_nameservers then
 			for _, server in ipairs(windows.get_nameservers()) do
 				self:addnameserver(server);
 			end
@@ -566,7 +602,11 @@ function resolver:getsocket(servernum)    -- - - - - - - - - - - - - getsocket
 	local sock = self.socket[servernum];
 	if sock then return sock; end
 
-	sock = socket.udp();
+	local err;
+	sock, err = socket.udp();
+	if not sock then
+		return nil, err;
+	end
 	if self.socket_wrapper then sock = self.socket_wrapper(sock, self); end
 	sock:settimeout(0);
 	-- todo: attempt to use a random port, fallback to 0
@@ -671,18 +711,21 @@ function resolver:query(qname, qtype, qclass)    -- - - - - - - - - - -- query
 		retry  = socket.gettime() + self.delays[1]
 	};
 
-  -- remember the query
+	-- remember the query
 	self.active[id] = self.active[id] or {};
 	self.active[id][question] = o;
 
-  -- remember which coroutine wants the answer
+	-- remember which coroutine wants the answer
 	local co = coroutine.running();
 	if co then
 		set(self.wanted, qclass, qtype, qname, co, true);
 		--set(self.yielded, co, qclass, qtype, qname, true);
 	end
 
-	local conn = self:getsocket(o.server)
+	local conn, err = self:getsocket(o.server)
+	if not conn then
+		return nil, err;
+	end
 	conn:send (o.packet)
 	
 	if timer and self.timeout then
@@ -694,16 +737,18 @@ function resolver:query(qname, qtype, qclass)    -- - - - - - - - - - -- query
 					i = i + 1;
 					self:servfail(conn);
 					o.server = self.best_server;
-					conn = self:getsocket(o.server);
-					conn:send(o.packet);
-					return self.timeout;
-				else
-					-- Tried everything, failed
-					self:cancel(qclass, qtype, qname, co, true);
+					conn, err = self:getsocket(o.server);
+					if conn then
+						conn:send(o.packet);
+						return self.timeout;
+					end
 				end
+				-- Tried everything, failed
+				self:cancel(qclass, qtype, qname, co, true);
 			end
 		end)
 	end
+	return true;
 end
 
 function resolver:servfail(sock)
@@ -735,7 +780,7 @@ function resolver:servfail(sock)
 			end
 		end
 	end
-   
+
 	if num == self.best_server then
 		self.best_server = self.best_server + 1;
 		if self.best_server > #self.server then
@@ -884,12 +929,12 @@ end
 function resolver:lookup(qname, qtype, qclass)    -- - - - - - - - - -  lookup
 	self:query (qname, qtype, qclass)
 	while self:pulse() do
-           local recvt = {}
-           for i, s in ipairs(self.socket) do
-              recvt[i] = s
-           end
-           socket.select(recvt, nil, 4)
-        end
+		local recvt = {}
+		for i, s in ipairs(self.socket) do
+			recvt[i] = s
+		end
+		socket.select(recvt, nil, 4)
+	end
 	--print(self.cache);
 	return self:peek(qname, qtype, qclass);
 end
@@ -898,6 +943,9 @@ function resolver:lookupex(handler, qname, qtype, qclass)    -- - - - - - - - -
 	return self:peek(qname, qtype, qclass) or self:query(qname, qtype, qclass);
 end
 
+function resolver:tohostname(ip)
+	return dns.lookup(ip:gsub("(%d+)%.(%d+)%.(%d+)%.(%d+)", "%4.%3.%2.%1.in-addr.arpa."), "PTR");
+end
 
 --print ---------------------------------------------------------------- print
 
@@ -973,6 +1021,10 @@ function dns.lookup(...)    -- - - - - - - - - - - - - - - - - - - - -  lookup
 	return _resolver:lookup(...);
 end
 
+function dns.tohostname(...)
+	return _resolver:tohostname(...);
+end
+
 function dns.purge(...)    -- - - - - - - - - - - - - - - - - - - - - -  purge
 	return _resolver:purge(...);
 end