1 files changed, 115 insertions, 0 deletions
diff --git a/scripts/kresd-host.lua b/scripts/kresd-host.lua
new file mode 100755
index 0000000..be6efd4
--- /dev/null
+++ b/scripts/kresd-host.lua
@@ -0,0 +1,115 @@
+#!/usr/bin/env luajit
+-- SPDX-License-Identifier: GPL-3.0-or-later
+-- Work around OS X stripping dyld variables
+cli_bin = 'luajit scripts/kresd-query.lua'
+libdir = os.getenv('DYLD_LIBRARY_PATH')
+if libdir then
+	cli_bin = string.format('DYLD_LIBRARY_PATH="%s" %s', libdir, cli_bin)
+end
+-- Parse CLI arguments
+local function help(rc)
+	print(string.format([[
+Usage: %s [-vdh46D] [-c class] [-t type]
+          [-f keyfile] hostname
+  Queries the DNS for information.
+  The hostname is looked up for IP4, IP6 and mail.
+  Use the -v option to see DNSSEC security information.
+    -t type     what type to look for.
+    -c class    what class to look for, if not class IN.
+    -C confstr  additional kresd-style configuration.
+    -D          DNSSEC enable with default root anchor
+    -f keyfile  read trust anchors from file, with lines as -y.
+    -v          be more verbose, shows nodata and security.
+    -d          debug, traces the action, -d -d shows more.
+    -4          use ipv4 network, avoid ipv6.
+    -6          use ipv6 network, avoid ipv4.
+    -h          show this usage help.]],
+    arg[0]))
+	return rc
+end
+
+-- Parse CLI arguments
+if #arg < 1 then
+	return help(1)
+end
+local qtypes, qclass, qname = {}, 'IN', nil
+local verbose, config = false, {}
+k = 1 while k <= #arg do
+	local v = arg[k]
+	if v == '-h' or v == '--help' then
+		return help(0)
+	elseif v == '-C' then
+		k = k + 1
+		table.insert(config, arg[k])
+	elseif v == '-D' then
+		table.insert(config, 'trust_anchors.add_file("root.keys")')
+	elseif v == '-f' then
+		k = k + 1
+		table.insert(config, string.format('trust_anchors.add_file("%s")', arg[k]))
+	elseif v == '-v' then
+		verbose = true
+	elseif v == '-d' then
+		verbose = true
+		table.insert(config, 'log_level("debug")')
+	elseif v == '-4' then
+		table.insert(config, 'net.ipv6 = false')
+	elseif v == '-6' then
+		table.insert(config, 'net.ipv4 = false')
+	elseif v == '-c' then
+		k = k + 1
+		qclass = arg[k]:upper()
+	elseif v == '-t' then
+		k = k + 1
+		table.insert(qtypes, arg[k]:upper())
+	elseif v:byte() == string.byte('-') then
+		return help(1)
+	else
+		qname = v
+		-- Check if name is an IP addresses
+		-- @TODO: convert to domain name and make a PTR lookup
+	end
+	k = k + 1
+end
+if not qname then
+	return help(1)
+end
+if #qtypes == 0 then
+	qtypes = {'A', 'AAAA', 'MX'}
+end
+-- Assemble config/query
+for _, qtype in ipairs(qtypes) do
+	query = string.format('-t %s -c %s %s', qtype, qclass, qname)
+	capture = string.format([[
+	local qname = "%s"
+	local qtype = "%s"
+	local qverbose = %s]], qname, qtype, tostring(verbose))..[[
+	local qry = req:resolved()
+	local section = pkt:rrsets(kres.section.ANSWER)
+	for i = 1, #section do
+		local rr = section[i]
+		for k = 1, rr.rrs.count do
+			local rdata = rr:tostring(k - 1)
+			local owner = kres.dname2str(rr:owner())
+			if qverbose then
+				if not qry.flags.DNSSEC_WANT or qry.flags.DNSSEC_INSECURE then
+						rdata = rdata .. " (insecure)"
+				else
+						rdata = rdata .. " (secure)"
+				end
+			end
+			if rr.type == kres.type.A then
+				print(string.format("%s has address %s", owner, rdata))
+			elseif rr.type == kres.type.AAAA then
+				print(string.format("%s has IPv6 address %s", owner, rdata))
+			elseif rr.type == kres.type.MX then
+				print(string.format("%s mail is handled by %s", owner, rdata))
+			elseif rr.type == kres.type.CNAME then
+				print(string.format("%s is an alias for %s", owner, rdata))
+			else
+				print(string.format("%s has %s record %s", owner, qtype, rdata))
+			end
+		end
+	end
+	]]
+	os.execute(string.format('%s -C \'%s\' %s \'%s\'', cli_bin, table.concat(config, ' '), query, capture))
+end