b6a07b6a7f052e5659d661d974e9f6bad61c6778
[hcoop/domtool2.git] / 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
54 val record = fn (EApp ((EApp ((EVar "dnsA", _), e1), _), e2), _) =>
55 (case (Env.string e1, Domain.ip e2) of
56 (SOME v1, SOME v2) => SOME (A (v1, v2))
57 | _ => NONE)
58 | (EApp ((EApp ((EVar "dnsCNAME", _), e1), _), e2), _) =>
59 (case (Env.string e1, Env.string e2) of
60 (SOME v1, SOME v2) => SOME (CNAME (v1, v2))
61 | _ => NONE)
62 | (EApp ((EApp ((EVar "dnsMX", _), e1), _), e2), _) =>
63 (case (Env.int e1, Env.string e2) of
64 (SOME v1, SOME v2) => SOME (MX (v1, v2))
65 | _ => NONE)
66 | (EApp ((EVar "dnsNS", _), e), _) =>
67 Option.map NS (Env.string e)
68 | (EApp ((EVar "dnsDefaultA", _), e), _) =>
69 Option.map DefaultA (Env.string e)
70 | _ => NONE
71
72 fun writeRecord (evs, r) =
73 case !dns of
74 NONE => print "Warning: DNS directive ignored because no master DNS server is configured for this domain\n"
75 | SOME files =>
76 let
77 fun write s = #write files s
78 fun writeDom () = #writeDom files ()
79 val ttl = Env.env Env.int (evs, "TTL")
80 in
81 case r of
82 A (from, to) => (write from;
83 write ".";
84 writeDom ();
85 write ".\t";
86 write (Int.toString ttl);
87 write "\tIN\tA\t";
88 write to;
89 write "\n")
90 | DefaultA to => (writeDom ();
91 write ".\t";
92 write (Int.toString ttl);
93 write "\tIN\tA\t";
94 write to;
95 write "\n")
96 | CNAME (from, to) => (write from;
97 write ".";
98 writeDom ();
99 write ".\t";
100 write (Int.toString ttl);
101 write "\tIN\tCNAME\t";
102 write to;
103 write ".\n")
104 | MX (num, host) => (write "\t";
105 write (Int.toString ttl);
106 write "\tIN\tMX\t";
107 write (Int.toString num);
108 write "\t";
109 write host;
110 write ".\n")
111 | NS host => (write "\t";
112 write (Int.toString ttl);
113 write "\tIN\tNS\t";
114 write host;
115 write ".\n")
116 end
117
118 val () = Env.actionV_one "dns"
119 ("record", record)
120 writeRecord
121
122 fun readLine inf =
123 case TextIO.inputLine inf of
124 NONE => raise Fail "Expected a line for BIND"
125 | SOME s => String.substring (s, 0, size s - 1)
126
127 fun readILine inf = valOf (Int.fromString (readLine inf))
128
129 val monthToInt = fn Date.Jan => 1
130 | Date.Feb => 2
131 | Date.Mar => 3
132 | Date.Apr => 4
133 | Date.May => 5
134 | Date.Jun => 6
135 | Date.Jul => 7
136 | Date.Aug => 8
137 | Date.Sep => 9
138 | Date.Oct => 10
139 | Date.Nov => 11
140 | Date.Dec => 12
141
142 fun padBy ch amt s =
143 if size s < amt then
144 CharVector.tabulate (amt - size s, fn _ => ch) ^ s
145 else
146 s
147
148 fun dateString () =
149 let
150 val date = Date.fromTimeUniv (Time.now ())
151 in
152 padBy #"0" 4 (Int.toString (Date.year date))
153 ^ padBy #"0" 2 (Int.toString (monthToInt (Date.month date)))
154 ^ padBy #"0" 2 (Int.toString (Date.day date))
155 end
156
157 val () = Slave.registerFileHandler (fn fs =>
158 let
159 val {dir, file} = OS.Path.splitDirFile (#file fs)
160
161 fun dnsChanged () =
162 if #domain fs = !didDomain then
163 ()
164 else if #action fs = Slave.Delete then
165 let
166 val fname = OS.Path.joinBaseExt {base = #domain fs,
167 ext = SOME "zone"}
168 val fname = OS.Path.joinDirFile {dir = Config.Bind.zonePath,
169 file = fname}
170 in
171 Slave.shellF ([Config.rm, " -f ", fname],
172 fn cl => "Error deleting file: " ^ cl)
173 end
174 else
175 let
176 val inf = TextIO.openIn (OS.Path.joinDirFile {dir = #dir fs,
177 file = "soa"})
178 val kind = readLine inf
179 val ttl = readILine inf
180 val ns = readLine inf
181 val serial = case readLine inf of
182 "" => NONE
183 | s => Int.fromString s
184 val rf = readILine inf
185 val ret = readILine inf
186 val exp = readILine inf
187 val min = readILine inf
188 val () = TextIO.closeIn inf
189
190 val serialPath = OS.Path.joinDirFile {dir = Config.serialDir,
191 file = #domain fs}
192
193 val oldSerial = let
194 val inf = TextIO.openIn serialPath
195 in
196 SOME (readLine inf)
197 before TextIO.closeIn inf
198 end handle IO.Io {name, ...} => NONE
199
200 val newSerial =
201 case serial of
202 SOME n => Int.toString n
203 | NONE =>
204 let
205 val prefix = dateString ()
206 in
207 prefix
208 ^ (case oldSerial of
209 NONE => "00"
210 | SOME old =>
211 if size old >= 8 andalso
212 String.substring (old, 0, 8) = prefix then
213 case Int.fromString (String.extract (old, 8, NONE)) of
214 NONE => "00"
215 | SOME old => padBy #"0" 2 (Int.toString (old+1))
216 else
217 "00")
218 end
219
220 val outf = TextIO.openOut serialPath
221 val _ = TextIO.output (outf, newSerial)
222 val _ = TextIO.closeOut outf
223
224 val dns = OS.Path.joinDirFile {dir = #dir fs,
225 file = "dns"}
226
227 val fname = OS.Path.joinBaseExt {base = #domain fs,
228 ext = SOME "zone"}
229 val fname = OS.Path.joinDirFile {dir = Config.Bind.zonePath,
230 file = fname}
231
232 val outf = TextIO.openOut fname
233 in
234 zoneChanged := true;
235 TextIO.output (outf, "$TTL ");
236 TextIO.output (outf, Int.toString ttl);
237 TextIO.output (outf, "\n\n@\tIN\tSOA\t");
238 TextIO.output (outf, ns);
239 TextIO.output (outf, ".\thostmaster.");
240 TextIO.output (outf, #domain fs);
241 TextIO.output (outf, ". ( ");
242 TextIO.output (outf, newSerial);
243 TextIO.output (outf, " ");
244 TextIO.output (outf, Int.toString rf);
245 TextIO.output (outf, " ");
246 TextIO.output (outf, Int.toString ret);
247 TextIO.output (outf, " ");
248 TextIO.output (outf, Int.toString exp);
249 TextIO.output (outf, " ");
250 TextIO.output (outf, Int.toString min);
251 TextIO.output (outf, " )\n\n");
252 TextIO.closeOut outf;
253 if Posix.FileSys.access (dns, []) then
254 Slave.shellF ([Config.cat, " ", dns, " >>", fname],
255 fn cl => "Error concatenating file: " ^ cl)
256 else
257 ();
258 didDomain := #domain fs
259 end
260 in
261 case file of
262 "soa" => dnsChanged ()
263 | "dns" => dnsChanged ()
264 | "named.conf" => namedChanged := true
265 | _ => ()
266 end)
267
268 val () = Slave.registerPostHandler
269 (fn () =>
270 (if !namedChanged then
271 Slave.concatTo (fn s => s = "named.conf") Config.Bind.namedConf
272 else
273 ();
274 if !namedChanged orelse !zoneChanged then
275 Slave.shellF ([Config.Bind.reload],
276 fn cl => "Error reloading bind with " ^ cl)
277 else
278 ()))
279
280 val () = Domain.registerResetLocal (fn () =>
281 ignore (OS.Process.system (Config.rm ^ " -rf /var/domtool/zones/*")))
282
283 end