[hcoop/domtool2.git] / src / plugins / bind.sml

(* HCoop Domtool (http://hcoop.sourceforge.net/)
 * Copyright (c) 2006, Adam Chlipala
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *)

(* BIND DNS *)

structure Bind :> BIND = struct

open Ast

val namedChanged = ref false
val zoneChanged = ref false

val didDomain = ref ""

val () = Slave.registerPreHandler (fn () => (namedChanged := false;
					     zoneChanged := false;
					     didDomain := ""))

val dns : Domain.files option ref = ref NONE

val _ = Domain.registerBefore
	    (fn _ => dns := Option.map (fn node => Domain.domainsFile {node = node,
								       name = "dns"})
				       (Domain.dnsMaster ()))
	
val _ = Domain.registerAfter
	    (fn _ => (Option.app (fn files => #close files ()) (!dns);
		      dns := NONE))

val dl = ErrorMsg.dummyLoc

datatype dns_record =
	 A of string * string
       | CNAME of string * string
       | MX of int * string
       | NS of string

val record = fn (EApp ((EApp ((EVar "dnsA", _), e1), _), e2), _) =>
		(case (Env.string e1, Domain.ip e2) of
		     (SOME v1, SOME v2) => SOME (A (v1, v2))
		   | _ => NONE)
	      | (EApp ((EApp ((EVar "dnsCNAME", _), e1), _), e2), _) =>
		(case (Env.string e1, Env.string e2) of
		     (SOME v1, SOME v2) => SOME (CNAME (v1, v2))
		   | _ => NONE)
	      | (EApp ((EApp ((EVar "dnsMX", _), e1), _), e2), _) =>
		(case (Env.int e1, Env.string e2) of
		     (SOME v1, SOME v2) => SOME (MX (v1, v2))
		   | _ => NONE)
	      | (EApp ((EVar "dnsNS", _), e), _) =>
		Option.map NS (Env.string e)
	      | _ => NONE

fun writeRecord (evs, r) =
    case !dns of
	NONE => print "Warning: DNS directive ignored because no master DNS server is configured for this domain\n"
      | SOME files =>
	let
	    fun write s = #write files s
	    fun writeDom () = #writeDom files ()
	    val ttl = Env.env Env.int (evs, "TTL")
	in
	    case r of
		A (from, to) => (write from;
				 write ".";
				 writeDom ();
				 write ".\t";
				 write (Int.toString ttl);
				 write "\tIN\tA\t";
				 write to;
				 write "\n")
	      | CNAME (from, to) => (write from;
				     write ".";
				     writeDom ();
				     write ".\t";
				     write (Int.toString ttl);
				     write "\tIN\tCNAME\t";
				     write to;
				     write ".\n")
	      | MX (num, host) => (write "\t";
				   write (Int.toString ttl);
				   write "\tIN\tMX\t";
				   write (Int.toString num);
				   write "\t";
				   write host;
				   write ".\n")
	      | NS host => (write "\t";
			    write (Int.toString ttl);
			    write "\tIN\tNS\t";
			    write host;
			    write ".\n")
	end

val () = Env.actionV_one "dns"
			 ("record", record)
			 writeRecord

fun readLine inf =
    case TextIO.inputLine inf of
	NONE => raise Fail "Expected a line for BIND"
      | SOME s => String.substring (s, 0, size s - 1)

fun readILine inf = valOf (Int.fromString (readLine inf))

val monthToInt = fn Date.Jan => 1
		  | Date.Feb => 2
		  | Date.Mar => 3
		  | Date.Apr => 4
		  | Date.May => 5
		  | Date.Jun => 6
		  | Date.Jul => 7
		  | Date.Aug => 8
		  | Date.Sep => 9
		  | Date.Oct => 10
		  | Date.Nov => 11
		  | Date.Dec => 12

fun padBy ch amt s =
    if size s < amt then
	CharVector.tabulate (amt - size s, fn _ => ch) ^ s
    else
	s

fun dateString () =
    let
	val date = Date.fromTimeUniv (Time.now ())
    in
	padBy #"0" 4 (Int.toString (Date.year date))
	^ padBy #"0" 2 (Int.toString (monthToInt (Date.month date)))
	^ padBy #"0" 2 (Int.toString (Date.day date))
    end

val () = Slave.registerFileHandler (fn fs =>
				       let
					   val {dir, file} = OS.Path.splitDirFile (#file fs)
							     
					   fun dnsChanged () =
					       if #domain fs = !didDomain then
						   ()
					       else if #action fs = Slave.Delete then
						   let
						       val fname = OS.Path.joinBaseExt {base = #domain fs,
											ext = SOME "zone"}
						       val fname = OS.Path.joinDirFile {dir = Config.Bind.zonePath,
											file = fname}
						   in
						       Slave.shellF ([Config.rm, " -f ", fname],
								  fn cl => "Error deleting file: " ^ cl)
						   end
					       else
						   let
						       val inf = TextIO.openIn (OS.Path.joinDirFile {dir = #dir fs,
												     file = "soa"})
						       val kind = readLine inf
						       val ttl = readILine inf
						       val ns = readLine inf
						       val serial = case readLine inf of
									"" => NONE
								      | s => Int.fromString s
						       val rf = readILine inf
						       val ret = readILine inf
						       val exp = readILine inf
						       val min = readILine inf
						       val () = TextIO.closeIn inf

						       val serialPath = OS.Path.joinDirFile {dir = Config.serialDir,
											     file = #domain fs}

						       val oldSerial = let
							   val inf = TextIO.openIn serialPath
						       in
							   SOME (readLine inf)
							   before TextIO.closeIn inf
						       end handle IO.Io {name, ...} => NONE

						       val newSerial =
							   case serial of
							       SOME n => Int.toString n
							     | NONE =>
							       let
								   val prefix = dateString ()
							       in
								   prefix
								   ^ (case oldSerial of
									  NONE => "00"
									| SOME old =>
									  if size old >= 8 andalso
									     String.substring (old, 0, 8) = prefix then
									      case Int.fromString (String.extract (old, 8, NONE)) of
										  NONE => "00"
										| SOME old => padBy #"0" 2 (Int.toString (old+1))
									  else
									      "00")
							       end

						       val outf = TextIO.openOut serialPath
						       val _ = TextIO.output (outf, newSerial)
						       val _ = TextIO.closeOut outf

						       val dns = OS.Path.joinDirFile {dir = #dir fs,
										      file = "dns"}

						       val fname = OS.Path.joinBaseExt {base = #domain fs,
											ext = SOME "zone"}
						       val fname = OS.Path.joinDirFile {dir = Config.Bind.zonePath,
											file = fname}

						       val outf = TextIO.openOut fname
						   in
						       zoneChanged := true;
						       TextIO.output (outf, "$TTL ");
						       TextIO.output (outf, Int.toString ttl);
						       TextIO.output (outf, "\n\n@\tIN\tSOA\t");
						       TextIO.output (outf, ns);
						       TextIO.output (outf, ".\thostmaster.");
						       TextIO.output (outf, #domain fs);
						       TextIO.output (outf, ". ( ");
						       TextIO.output (outf, newSerial);
						       TextIO.output (outf, " ");
						       TextIO.output (outf, Int.toString rf);
						       TextIO.output (outf, " ");
						       TextIO.output (outf, Int.toString ret);
						       TextIO.output (outf, " ");
						       TextIO.output (outf, Int.toString exp);
						       TextIO.output (outf, " ");
						       TextIO.output (outf, Int.toString min);
						       TextIO.output (outf, " )\n\n");
						       TextIO.closeOut outf;
						       if Posix.FileSys.access (dns, []) then
							   Slave.shellF ([Config.cat, " ", dns, " >>", fname],
								      fn cl => "Error concatenating file: " ^ cl)
						       else
							   ();
						       didDomain := #domain fs
						   end
				       in
					   case file of
					       "soa" => dnsChanged ()
					     | "dns" => dnsChanged ()
					     | "named.conf" => namedChanged := true
					     | _ => ()
				       end)

val () = Slave.registerPostHandler
	     (fn () =>
		 (if !namedChanged then
		      Slave.concatTo (fn s => s = "named.conf") Config.Bind.namedConf
		  else
		     ();
		  if !namedChanged orelse !zoneChanged then
		      Slave.shellF ([Config.Bind.reload],
				 fn cl => "Error reloading bind with " ^ cl)
		  else
		      ()))

val () = Domain.registerResetLocal (fn () =>
				       ignore (OS.Process.system (Config.rm ^ " -rf /var/domtool/zones/*")))

end
Commit	Line	Data
6ae327f8 AC	1	(* HCoop Domtool (http://hcoop.sourceforge.net/)
	2	* Copyright (c) 2006, Adam Chlipala
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version 2
	7	* of the License, or (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	17	*)
	18
	19	(* BIND DNS *)
	20
	21	structure Bind :> BIND = struct
	22
	23	open Ast
	24
	25	val namedChanged = ref false
	26	val zoneChanged = ref false
	27
	28	val didDomain = ref ""
	29
	30	val () = Slave.registerPreHandler (fn () => (namedChanged := false;
	31	zoneChanged := false;
	32	didDomain := ""))
	33
fa3b6b87	34	val dns : Domain.files option ref = ref NONE
6ae327f8 AC	35
6ae327f8 AC	36	val _ = Domain.registerBefore
fa3b6b87 AC	37	(fn _ => dns := Option.map (fn node => Domain.domainsFile {node = node,
fa3b6b87 AC	38	name = "dns"})
e0b0abd2	39	(Domain.dnsMaster ()))
6ae327f8 AC	40
6ae327f8 AC	41	val _ = Domain.registerAfter
fa3b6b87	42	(fn _ => (Option.app (fn files => #close files ()) (!dns);
325285ab	43	dns := NONE))
6ae327f8 AC	44
	45	val dl = ErrorMsg.dummyLoc
	46
	47	datatype dns_record =
	48	A of string * string
	49	\| CNAME of string * string
	50	\| MX of int * string
	51	\| NS of string
	52
	53	val record = fn (EApp ((EApp ((EVar "dnsA", _), e1), _), e2), _) =>
97665758	54	(case (Env.string e1, Domain.ip e2) of
6ae327f8 AC	55	(SOME v1, SOME v2) => SOME (A (v1, v2))
	56	\| _ => NONE)
	57	\| (EApp ((EApp ((EVar "dnsCNAME", _), e1), _), e2), _) =>
	58	(case (Env.string e1, Env.string e2) of
	59	(SOME v1, SOME v2) => SOME (CNAME (v1, v2))
	60	\| _ => NONE)
	61	\| (EApp ((EApp ((EVar "dnsMX", _), e1), _), e2), _) =>
	62	(case (Env.int e1, Env.string e2) of
	63	(SOME v1, SOME v2) => SOME (MX (v1, v2))
	64	\| _ => NONE)
	65	\| (EApp ((EVar "dnsNS", _), e), _) =>
	66	Option.map NS (Env.string e)
	67	\| _ => NONE
	68
	69	fun writeRecord (evs, r) =
e0b0abd2 AC	70	case !dns of
e0b0abd2 AC	71	NONE => print "Warning: DNS directive ignored because no master DNS server is configured for this domain\n"
fa3b6b87	72	\| SOME files =>
e0b0abd2	73	let
fa3b6b87 AC	74	fun write s = #write files s
fa3b6b87 AC	75	fun writeDom () = #writeDom files ()
e0b0abd2 AC	76	val ttl = Env.env Env.int (evs, "TTL")
	77	in
	78	case r of
	79	A (from, to) => (write from;
6ae327f8	80	write ".";
fa3b6b87	81	writeDom ();
6ae327f8 AC	82	write ".\t";
6ae327f8 AC	83	write (Int.toString ttl);
e0b0abd2	84	write "\tIN\tA\t";
6ae327f8	85	write to;
e0b0abd2 AC	86	write "\n")
	87	\| CNAME (from, to) => (write from;
	88	write ".";
fa3b6b87	89	writeDom ();
e0b0abd2 AC	90	write ".\t";
	91	write (Int.toString ttl);
	92	write "\tIN\tCNAME\t";
	93	write to;
	94	write ".\n")
	95	\| MX (num, host) => (write "\t";
	96	write (Int.toString ttl);
	97	write "\tIN\tMX\t";
	98	write (Int.toString num);
	99	write "\t";
	100	write host;
	101	write ".\n")
	102	\| NS host => (write "\t";
	103	write (Int.toString ttl);
	104	write "\tIN\tNS\t";
	105	write host;
	106	write ".\n")
	107	end
6ae327f8 AC	108
	109	val () = Env.actionV_one "dns"
	110	("record", record)
	111	writeRecord
	112
	113	fun readLine inf =
	114	case TextIO.inputLine inf of
	115	NONE => raise Fail "Expected a line for BIND"
	116	\| SOME s => String.substring (s, 0, size s - 1)
	117
	118	fun readILine inf = valOf (Int.fromString (readLine inf))
	119
3f07a40e AC	120	val monthToInt = fn Date.Jan => 1
	121	\| Date.Feb => 2
	122	\| Date.Mar => 3
	123	\| Date.Apr => 4
	124	\| Date.May => 5
	125	\| Date.Jun => 6
	126	\| Date.Jul => 7
	127	\| Date.Aug => 8
	128	\| Date.Sep => 9
	129	\| Date.Oct => 10
	130	\| Date.Nov => 11
	131	\| Date.Dec => 12
	132
	133	fun padBy ch amt s =
	134	if size s < amt then
82a0d609	135	CharVector.tabulate (amt - size s, fn _ => ch) ^ s
3f07a40e AC	136	else
	137	s
	138
	139	fun dateString () =
	140	let
	141	val date = Date.fromTimeUniv (Time.now ())
	142	in
	143	padBy #"0" 4 (Int.toString (Date.year date))
	144	^ padBy #"0" 2 (Int.toString (monthToInt (Date.month date)))
	145	^ padBy #"0" 2 (Int.toString (Date.day date))
	146	end
	147
6ae327f8 AC	148	val () = Slave.registerFileHandler (fn fs =>
	149	let
	150	val {dir, file} = OS.Path.splitDirFile (#file fs)
	151
	152	fun dnsChanged () =
	153	if #domain fs = !didDomain then
	154	()
	155	else if #action fs = Slave.Delete then
	156	let
	157	val fname = OS.Path.joinBaseExt {base = #domain fs,
	158	ext = SOME "zone"}
	159	val fname = OS.Path.joinDirFile {dir = Config.Bind.zonePath,
	160	file = fname}
	161	in
325285ab AC	162	Slave.shellF ([Config.rm, " -f ", fname],
325285ab AC	163	fn cl => "Error deleting file: " ^ cl)
6ae327f8 AC	164	end
	165	else
	166	let
	167	val inf = TextIO.openIn (OS.Path.joinDirFile {dir = #dir fs,
	168	file = "soa"})
	169	val kind = readLine inf
	170	val ttl = readILine inf
	171	val ns = readLine inf
	172	val serial = case readLine inf of
	173	"" => NONE
	174	\| s => Int.fromString s
	175	val rf = readILine inf
	176	val ret = readILine inf
	177	val exp = readILine inf
	178	val min = readILine inf
	179	val () = TextIO.closeIn inf
	180
82a0d609 AC	181	val serialPath = OS.Path.joinDirFile {dir = Config.serialDir,
	182	file = #domain fs}
	183
3f07a40e	184	val oldSerial = let
82a0d609	185	val inf = TextIO.openIn serialPath
3f07a40e AC	186	in
	187	SOME (readLine inf)
	188	before TextIO.closeIn inf
82a0d609	189	end handle IO.Io {name, ...} => NONE
3f07a40e AC	190
	191	val newSerial =
	192	case serial of
	193	SOME n => Int.toString n
	194	\| NONE =>
	195	let
	196	val prefix = dateString ()
	197	in
	198	prefix
	199	^ (case oldSerial of
	200	NONE => "00"
	201	\| SOME old =>
	202	if size old >= 8 andalso
	203	String.substring (old, 0, 8) = prefix then
	204	case Int.fromString (String.extract (old, 8, NONE)) of
	205	NONE => "00"
	206	\| SOME old => padBy #"0" 2 (Int.toString (old+1))
	207	else
	208	"00")
	209	end
	210
82a0d609	211	val outf = TextIO.openOut serialPath
3f07a40e AC	212	val _ = TextIO.output (outf, newSerial)
	213	val _ = TextIO.closeOut outf
	214
6ae327f8 AC	215	val dns = OS.Path.joinDirFile {dir = #dir fs,
	216	file = "dns"}
	217
	218	val fname = OS.Path.joinBaseExt {base = #domain fs,
	219	ext = SOME "zone"}
	220	val fname = OS.Path.joinDirFile {dir = Config.Bind.zonePath,
	221	file = fname}
	222
	223	val outf = TextIO.openOut fname
	224	in
	225	zoneChanged := true;
	226	TextIO.output (outf, "$TTL ");
	227	TextIO.output (outf, Int.toString ttl);
	228	TextIO.output (outf, "\n\n@\tIN\tSOA\t");
	229	TextIO.output (outf, ns);
	230	TextIO.output (outf, ".\thostmaster.");
	231	TextIO.output (outf, #domain fs);
722e651b	232	TextIO.output (outf, ". ( ");
3f07a40e	233	TextIO.output (outf, newSerial);
6ae327f8 AC	234	TextIO.output (outf, " ");
	235	TextIO.output (outf, Int.toString rf);
	236	TextIO.output (outf, " ");
	237	TextIO.output (outf, Int.toString ret);
	238	TextIO.output (outf, " ");
	239	TextIO.output (outf, Int.toString exp);
	240	TextIO.output (outf, " ");
	241	TextIO.output (outf, Int.toString min);
	242	TextIO.output (outf, " )\n\n");
	243	TextIO.closeOut outf;
325285ab AC	244	if Posix.FileSys.access (dns, []) then
	245	Slave.shellF ([Config.cat, " ", dns, " >>", fname],
	246	fn cl => "Error concatenating file: " ^ cl)
	247	else
	248	();
6ae327f8 AC	249	didDomain := #domain fs
	250	end
	251	in
	252	case file of
	253	"soa" => dnsChanged ()
	254	\| "dns" => dnsChanged ()
	255	\| "named.conf" => namedChanged := true
	256	\| _ => ()
	257	end)
	258
	259	val () = Slave.registerPostHandler
	260	(fn () =>
	261	(if !namedChanged then
	262	Slave.concatTo (fn s => s = "named.conf") Config.Bind.namedConf
	263	else
	264	();
	265	if !namedChanged orelse !zoneChanged then
	266	Slave.shellF ([Config.Bind.reload],
	267	fn cl => "Error reloading bind with " ^ cl)
	268	else
	269	()))
71420f8b AC	270
	271	val () = Domain.registerResetLocal (fn () =>
	272	ignore (OS.Process.system (Config.rm ^ " -rf /var/domtool/zones/*")))
	273
6ae327f8	274	end