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 : Domain.files option ref = ref NONE
  35
  36 val _ = Domain.registerBefore
  37             (fn _ => dns := Option.map (fn node => Domain.domainsFile {node = node,
  38                                                                        name = "dns"})
  39                                        (Domain.dnsMaster ()))
  40
  41 val _ = Domain.registerAfter
  42             (fn _ => (Option.app (fn files => #close files ()) (!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        | DefaultA of string
  53        | AAAA of string * string
  54        | DefaultAAAA of string
  55
  56 val record = fn (EApp ((EApp ((EVar "dnsA", _), e1), _), e2), _) =>
  57                 (case (Env.string e1, Domain.ip e2) of
  58                      (SOME v1, SOME v2) => SOME (A (v1, v2))
  59                    | _ => NONE)
  60               | (EApp ((EApp ((EVar "dnsCNAME", _), e1), _), e2), _) =>
  61                 (case (Env.string e1, Env.string e2) of
  62                      (SOME v1, SOME v2) => SOME (CNAME (v1, v2))
  63                    | _ => NONE)
  64               | (EApp ((EApp ((EVar "dnsMX", _), e1), _), e2), _) =>
  65                 (case (Env.int e1, Env.string e2) of
  66                      (SOME v1, SOME v2) => SOME (MX (v1, v2))
  67                    | _ => NONE)
  68               | (EApp ((EVar "dnsNS", _), e), _) =>
  69                 Option.map NS (Env.string e)
  70               | (EApp ((EVar "dnsDefaultA", _), e), _) =>
  71                 Option.map DefaultA (Domain.ip e)
  72               | (EApp ((EApp ((EVar "dnsAAAA", _), e1), _), e2), _) =>
  73                 (case (Env.string e1, Env.string e2) of
  74                      (SOME v1, SOME v2) => SOME (AAAA (v1, v2))
  75                    | _ => NONE)
  76               | (EApp ((EVar "dnsDefaultAAAA", _), e), _) =>
  77                 Option.map DefaultAAAA (Env.string e)
  78               | _ => NONE
  79
  80 fun writeRecord (evs, r) =
  81     case !dns of
  82         NONE => print ("Warning: DNS directive for " ^ Domain.currentDomain ()
  83                        ^ " ignored because no master DNS server is configured for this domain\n")
  84       | SOME files =>
  85         let
  86             fun write s = #write files s
  87             fun writeDom () = #writeDom files ()
  88             val ttl = Env.env Env.int (evs, "TTL")
  89         in
  90             case r of
  91                 A (from, to) => (write from;
  92                                  write ".";
  93                                  writeDom ();
  94                                  write ".\t";
  95                                  write (Int.toString ttl);
  96                                  write "\tIN\tA\t";
  97                                  write to;
  98                                  write "\n")
  99               | DefaultA to => (writeDom ();
 100                                 write ".\t";
 101                                 write (Int.toString ttl);
 102                                 write "\tIN\tA\t";
 103                                 write to;
 104                                 write "\n")
 105               | CNAME (from, to) => (write from;
 106                                      write ".";
 107                                      writeDom ();
 108                                      write ".\t";
 109                                      write (Int.toString ttl);
 110                                      write "\tIN\tCNAME\t";
 111                                      write to;
 112                                      write ".\n")
 113               | MX (num, host) => (writeDom ();
 114                                    write ".\t";
 115                                    write (Int.toString ttl);
 116                                    write "\tIN\tMX\t";
 117                                    write (Int.toString num);
 118                                    write "\t";
 119                                    write host;
 120                                    write ".\n")
 121               | NS host => (writeDom ();
 122                             write ".\t";
 123                             write (Int.toString ttl);
 124                             write "\tIN\tNS\t";
 125                             write host;
 126                             write ".\n")
 127               | AAAA (from, to) => (write from;
 128                                     write ".";
 129                                     writeDom ();
 130                                     write ".\t";
 131                                     write (Int.toString ttl);
 132                                     write "\tIN\tAAAA\t";
 133                                     write to;
 134                                     write "\n")
 135               | DefaultAAAA to => (writeDom ();
 136                                    write ".\t";
 137                                    write (Int.toString ttl);
 138                                    write "\tIN\tAAAA\t";
 139                                    write to;
 140                                    write "\n")
 141         end
 142
 143 val () = Env.actionV_one "dns"
 144                          ("record", record)
 145                          writeRecord
 146
 147 fun readLine inf =
 148     case TextIO.inputLine inf of
 149         NONE => raise Fail "Expected a line for BIND"
 150       | SOME s => String.substring (s, 0, size s - 1)
 151
 152 fun readILine inf = valOf (Int.fromString (readLine inf))
 153
 154 val monthToInt = fn Date.Jan => 1
 155                   | Date.Feb => 2
 156                   | Date.Mar => 3
 157                   | Date.Apr => 4
 158                   | Date.May => 5
 159                   | Date.Jun => 6
 160                   | Date.Jul => 7
 161                   | Date.Aug => 8
 162                   | Date.Sep => 9
 163                   | Date.Oct => 10
 164                   | Date.Nov => 11
 165                   | Date.Dec => 12
 166
 167 fun padBy ch amt s =
 168     if size s < amt then
 169         CharVector.tabulate (amt - size s, fn _ => ch) ^ s
 170     else
 171         s
 172
 173 fun dateString () =
 174     let
 175         val date = Date.fromTimeUniv (Time.now ())
 176     in
 177         padBy #"0" 4 (Int.toString (Date.year date))
 178         ^ padBy #"0" 2 (Int.toString (monthToInt (Date.month date)))
 179         ^ padBy #"0" 2 (Int.toString (Date.day date))
 180     end
 181
 182 val () = Slave.registerFileHandler (fn fs =>
 183                                        let
 184                                            val {dir, file} = OS.Path.splitDirFile (#file fs)
 185
 186                                            fun dnsChanged () =
 187                                                if #domain fs = !didDomain then
 188                                                    ()
 189                                                else if Slave.isDelete (#action fs) then
 190                                                    let
 191                                                        val fname = OS.Path.joinBaseExt {base = #domain fs,
 192                                                                                         ext = SOME "zone"}
 193                                                        val fname = OS.Path.joinDirFile {dir = Config.Bind.zonePath,
 194                                                                                         file = fname}
 195                                                    in
 196                                                        Slave.shellF ([Config.rm, " -f ", fname],
 197                                                                   fn cl => "Error deleting file: " ^ cl)
 198                                                    end
 199                                                else
 200                                                    let
 201                                                        val inf = TextIO.openIn (OS.Path.joinDirFile {dir = #dir fs,
 202                                                                                                      file = "soa"})
 203                                                        val kind = readLine inf
 204                                                        val ttl = readILine inf
 205                                                        val ns = readLine inf
 206                                                        val serial = case readLine inf of
 207                                                                         "" => NONE
 208                                                                       | s => Int.fromString s
 209                                                        val rf = readILine inf
 210                                                        val ret = readILine inf
 211                                                        val exp = readILine inf
 212                                                        val min = readILine inf
 213                                                        val () = TextIO.closeIn inf
 214
 215                                                        val serialPath = OS.Path.joinDirFile {dir = Config.serialDir,
 216                                                                                              file = #domain fs}
 217
 218                                                        val oldSerial = let
 219                                                            val inf = TextIO.openIn serialPath
 220                                                        in
 221                                                            SOME (readLine inf)
 222                                                            before TextIO.closeIn inf
 223                                                        end handle IO.Io {name, ...} => NONE
 224
 225                                                        val newSerial =
 226                                                            case serial of
 227                                                                SOME n => Int.toString n
 228                                                              | NONE =>
 229                                                                let
 230                                                                    val prefix = dateString ()
 231                                                                in
 232                                                                    prefix
 233                                                                    ^ (case oldSerial of
 234                                                                           NONE => "00"
 235                                                                         | SOME old =>
 236                                                                           if size old >= 8 andalso
 237                                                                              String.substring (old, 0, 8) = prefix then
 238                                                                               case Int.fromString (String.extract (old, 8, NONE)) of
 239                                                                                   NONE => "00"
 240                                                                                 | SOME old => padBy #"0" 2 (Int.toString (old+1))
 241                                                                           else
 242                                                                               "00")
 243                                                                end
 244
 245                                                        val outf = TextIO.openOut serialPath
 246                                                        val _ = TextIO.output (outf, newSerial)
 247                                                        val _ = TextIO.closeOut outf
 248
 249                                                        val dns = OS.Path.joinDirFile {dir = #dir fs,
 250                                                                                       file = "dns"}
 251
 252                                                        val fname = OS.Path.joinBaseExt {base = #domain fs,
 253                                                                                         ext = SOME "zone"}
 254                                                        val fname = OS.Path.joinDirFile {dir = Config.Bind.zonePath,
 255                                                                                         file = fname}
 256
 257                                                        val outf = TextIO.openOut fname
 258                                                    in
 259                                                        zoneChanged := true;
 260                                                        TextIO.output (outf, "$TTL ");
 261                                                        TextIO.output (outf, Int.toString ttl);
 262                                                        TextIO.output (outf, "\n\n@\tIN\tSOA\t");
 263                                                        TextIO.output (outf, ns);
 264                                                        TextIO.output (outf, ".\thostmaster.");
 265                                                        TextIO.output (outf, #domain fs);
 266                                                        TextIO.output (outf, ". ( ");
 267                                                        TextIO.output (outf, newSerial);
 268                                                        TextIO.output (outf, " ");
 269                                                        TextIO.output (outf, Int.toString rf);
 270                                                        TextIO.output (outf, " ");
 271                                                        TextIO.output (outf, Int.toString ret);
 272                                                        TextIO.output (outf, " ");
 273                                                        TextIO.output (outf, Int.toString exp);
 274                                                        TextIO.output (outf, " ");
 275                                                        TextIO.output (outf, Int.toString min);
 276                                                        TextIO.output (outf, " )\n\n");
 277                                                        TextIO.closeOut outf;
 278                                                        if Posix.FileSys.access (dns, []) then
 279                                                            Slave.shellF ([Config.cat, " ", dns, " >>", fname],
 280                                                                       fn cl => "Error concatenating file: " ^ cl)
 281                                                        else
 282                                                            ();
 283                                                        didDomain := #domain fs
 284                                                    end
 285                                        in
 286                                            case file of
 287                                                "soa" => dnsChanged ()
 288                                              | "dns" => dnsChanged ()
 289                                              | "named.conf" => namedChanged := true
 290                                              | _ => ()
 291                                        end)
 292
 293 val () = Slave.registerPostHandler
 294              (fn () =>
 295                  (if !namedChanged then
 296                       Slave.concatTo (fn s => s = "named.conf") Config.Bind.namedConf
 297                   else
 298                      ();
 299                   if !namedChanged orelse !zoneChanged then
 300                       Slave.shellF ([Config.Bind.reload],
 301                                  fn cl => "Error reloading bind with " ^ cl)
 302                   else
 303                       ()))
 304
 305 val () = Domain.registerResetLocal (fn () =>
 306                                        ignore (OS.Process.system (Config.rm ^ " -rf /var/domtool/zones/*")))
 307
 308 val () = Domain.registerDescriber (Domain.considerAll
 309                                    [Domain.Filename {filename = "named.conf",
 310                                                      heading = "named.conf addition:",
 311                                                      showEmpty = false},
 312                                     Domain.Filename {filename = "dns",
 313                                                      heading = "DNS zonefile contents:",
 314                                                      showEmpty = false}])
 315
 316 end