src/plugins/bind.sml

   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
  34 val dns : TextIO.outstream option ref = ref NONE
  35
  36 val _ = Domain.registerBefore
  37             (fn _ => dns := Option.map (fn node => Domain.domainFile {node = node,
  38                                                                       name = "dns"})
  39                                        (Domain.dnsMaster ()))
  40
  41 val _ = Domain.registerAfter
  42             (fn _ => (Option.app TextIO.closeOut (!dns);
  43                       dns := NONE))
  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), _) =>
  54                 (case (Env.string e1, Domain.ip e2) of
  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) =
  70     case !dns of
  71         NONE => print "Warning: DNS directive ignored because no master DNS server is configured for this domain\n"
  72       | SOME file =>
  73         let
  74             fun write s = TextIO.output (file, s)
  75             val ttl = Env.env Env.int (evs, "TTL")
  76         in
  77             case r of
  78                 A (from, to) => (write from;
  79                                  write ".";
  80                                  write (Domain.currentDomain ());
  81                                  write ".\t";
  82                                  write (Int.toString ttl);
  83                                  write "\tIN\tA\t";
  84                                  write to;
  85                                  write "\n")
  86               | CNAME (from, to) => (write from;
  87                                      write ".";
  88                                      write (Domain.currentDomain ());
  89                                      write ".\t";
  90                                      write (Int.toString ttl);
  91                                      write "\tIN\tCNAME\t";
  92                                      write to;
  93                                      write ".\n")
  94               | MX (num, host) => (write "\t";
  95                                    write (Int.toString ttl);
  96                                    write "\tIN\tMX\t";
  97                                    write (Int.toString num);
  98                                    write "\t";
  99                                    write host;
 100                                    write ".\n")
 101               | NS host => (write "\t";
 102                             write (Int.toString ttl);
 103                             write "\tIN\tNS\t";
 104                             write host;
 105                             write ".\n")
 106         end
 107
 108 val () = Env.actionV_one "dns"
 109                          ("record", record)
 110                          writeRecord
 111
 112 fun readLine inf =
 113     case TextIO.inputLine inf of
 114         NONE => raise Fail "Expected a line for BIND"
 115       | SOME s => String.substring (s, 0, size s - 1)
 116
 117 fun readILine inf = valOf (Int.fromString (readLine inf))
 118
 119 val monthToInt = fn Date.Jan => 1
 120                   | Date.Feb => 2
 121                   | Date.Mar => 3
 122                   | Date.Apr => 4
 123                   | Date.May => 5
 124                   | Date.Jun => 6
 125                   | Date.Jul => 7
 126                   | Date.Aug => 8
 127                   | Date.Sep => 9
 128                   | Date.Oct => 10
 129                   | Date.Nov => 11
 130                   | Date.Dec => 12
 131
 132 fun padBy ch amt s =
 133     if size s < amt then
 134         CharVector.tabulate (amt, fn _ => ch) ^ s
 135     else
 136         s
 137
 138 fun dateString () =
 139     let
 140         val date = Date.fromTimeUniv (Time.now ())
 141     in
 142         padBy #"0" 4 (Int.toString (Date.year date))
 143         ^ padBy #"0" 2 (Int.toString (monthToInt (Date.month date)))
 144         ^ padBy #"0" 2 (Int.toString (Date.day date))
 145     end
 146
 147 val () = Slave.registerFileHandler (fn fs =>
 148                                        let
 149                                            val {dir, file} = OS.Path.splitDirFile (#file fs)
 150
 151                                            fun dnsChanged () =
 152                                                if #domain fs = !didDomain then
 153                                                    ()
 154                                                else if #action fs = Slave.Delete then
 155                                                    let
 156                                                        val fname = OS.Path.joinBaseExt {base = #domain fs,
 157                                                                                         ext = SOME "zone"}
 158                                                        val fname = OS.Path.joinDirFile {dir = Config.Bind.zonePath,
 159                                                                                         file = fname}
 160                                                    in
 161                                                        Slave.shellF ([Config.rm, " -f ", fname],
 162                                                                   fn cl => "Error deleting file: " ^ cl)
 163                                                    end
 164                                                else
 165                                                    let
 166                                                        val inf = TextIO.openIn (OS.Path.joinDirFile {dir = #dir fs,
 167                                                                                                      file = "soa"})
 168                                                        val kind = readLine inf
 169                                                        val ttl = readILine inf
 170                                                        val ns = readLine inf
 171                                                        val serial = case readLine inf of
 172                                                                         "" => NONE
 173                                                                       | s => Int.fromString s
 174                                                        val rf = readILine inf
 175                                                        val ret = readILine inf
 176                                                        val exp = readILine inf
 177                                                        val min = readILine inf
 178                                                        val () = TextIO.closeIn inf
 179
 180                                                        val oldSerial = let
 181                                                            val inf = TextIO.openIn (OS.Path.joinDirFile {dir = #dir fs,
 182                                                                                                          file = "serial"})
 183                                                        in
 184                                                            SOME (readLine inf)
 185                                                            before TextIO.closeIn inf
 186                                                        end handle IO.Io _ => NONE
 187
 188                                                        val newSerial =
 189                                                            case serial of
 190                                                                SOME n => Int.toString n
 191                                                              | NONE =>
 192                                                                let
 193                                                                    val prefix = dateString ()
 194                                                                in
 195                                                                    prefix
 196                                                                    ^ (case oldSerial of
 197                                                                           NONE => "00"
 198                                                                         | SOME old =>
 199                                                                           if size old >= 8 andalso
 200                                                                              String.substring (old, 0, 8) = prefix then
 201                                                                               case Int.fromString (String.extract (old, 8, NONE)) of
 202                                                                                   NONE => "00"
 203                                                                                 | SOME old => padBy #"0" 2 (Int.toString (old+1))
 204                                                                           else
 205                                                                               "00")
 206                                                                end
 207
 208                                                        val outf = TextIO.openOut (OS.Path.joinDirFile {dir = #dir fs,
 209                                                                                                        file = "serial"})
 210                                                        val _ = TextIO.output (outf, newSerial)
 211                                                        val _ = TextIO.closeOut outf
 212
 213                                                        val dns = OS.Path.joinDirFile {dir = #dir fs,
 214                                                                                       file = "dns"}
 215
 216                                                        val fname = OS.Path.joinBaseExt {base = #domain fs,
 217                                                                                         ext = SOME "zone"}
 218                                                        val fname = OS.Path.joinDirFile {dir = Config.Bind.zonePath,
 219                                                                                         file = fname}
 220
 221                                                        val outf = TextIO.openOut fname
 222                                                    in
 223                                                        zoneChanged := true;
 224                                                        TextIO.output (outf, "$TTL ");
 225                                                        TextIO.output (outf, Int.toString ttl);
 226                                                        TextIO.output (outf, "\n\n@\tIN\tSOA\t");
 227                                                        TextIO.output (outf, ns);
 228                                                        TextIO.output (outf, ".\thostmaster.");
 229                                                        TextIO.output (outf, #domain fs);
 230                                                        TextIO.output (outf, ". ( ");
 231                                                        TextIO.output (outf, newSerial);
 232                                                        TextIO.output (outf, " ");
 233                                                        TextIO.output (outf, Int.toString rf);
 234                                                        TextIO.output (outf, " ");
 235                                                        TextIO.output (outf, Int.toString ret);
 236                                                        TextIO.output (outf, " ");
 237                                                        TextIO.output (outf, Int.toString exp);
 238                                                        TextIO.output (outf, " ");
 239                                                        TextIO.output (outf, Int.toString min);
 240                                                        TextIO.output (outf, " )\n\n");
 241                                                        TextIO.closeOut outf;
 242                                                        if Posix.FileSys.access (dns, []) then
 243                                                            Slave.shellF ([Config.cat, " ", dns, " >>", fname],
 244                                                                       fn cl => "Error concatenating file: " ^ cl)
 245                                                        else
 246                                                            ();
 247                                                        didDomain := #domain fs
 248                                                    end
 249                                        in
 250                                            case file of
 251                                                "soa" => dnsChanged ()
 252                                              | "dns" => dnsChanged ()
 253                                              | "named.conf" => namedChanged := true
 254                                              | _ => ()
 255                                        end)
 256
 257 val () = Slave.registerPostHandler
 258              (fn () =>
 259                  (if !namedChanged then
 260                       Slave.concatTo (fn s => s = "named.conf") Config.Bind.namedConf
 261                   else
 262                      ();
 263                   if !namedChanged orelse !zoneChanged then
 264                       Slave.shellF ([Config.Bind.reload],
 265                                  fn cl => "Error reloading bind with " ^ cl)
 266                   else
 267                       ()))
 268 end