src/msg.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 (* Network messages *)
  20
  21 structure Msg :> MSG = struct
  22
  23 open OpenSSL MsgTypes Slave
  24
  25 val a2i = fn Add => 0
  26            | Delete => 1
  27            | Modify => 2
  28
  29 val i2a = fn 0 => Add
  30            | 1 => Delete
  31            | 2 => Modify
  32            | _ => raise OpenSSL.OpenSSL "Bad action number to deserialize"
  33
  34 fun sendAcl (bio, {user, class, value}) =
  35     (OpenSSL.writeString (bio, user);
  36      OpenSSL.writeString (bio, class);
  37      OpenSSL.writeString (bio, value))
  38
  39 fun recvAcl bio =
  40     case (OpenSSL.readString bio, OpenSSL.readString bio, OpenSSL.readString bio) of
  41         (SOME user, SOME class, SOME value) => SOME {user = user, class = class, value = value}
  42       | _ => NONE
  43
  44 fun send (bio, m) =
  45     case m of
  46         MsgOk => OpenSSL.writeInt (bio, 1)
  47       | MsgError s => (OpenSSL.writeInt (bio, 2);
  48                        OpenSSL.writeString (bio, s))
  49       | MsgConfig s => (OpenSSL.writeInt (bio, 3);
  50                        OpenSSL.writeString (bio, s))
  51       | MsgFile {action, domain, dir, file} =>
  52         (OpenSSL.writeInt (bio, 4);
  53          OpenSSL.writeInt (bio, a2i action);
  54          OpenSSL.writeString (bio, domain);
  55          OpenSSL.writeString (bio, dir);
  56          OpenSSL.writeString (bio, file))
  57       | MsgDoFiles => OpenSSL.writeInt (bio, 5)
  58       | MsgGrant acl => (OpenSSL.writeInt (bio, 6);
  59                          sendAcl (bio, acl))
  60       | MsgRevoke acl => (OpenSSL.writeInt (bio, 7);
  61                           sendAcl (bio, acl))
  62       | MsgListPerms user => (OpenSSL.writeInt (bio, 8);
  63                               OpenSSL.writeString (bio, user))
  64       | MsgPerms classes => (OpenSSL.writeInt (bio, 9);
  65                              app (fn (class, values) =>
  66                                      (OpenSSL.writeInt (bio, 1);
  67                                       OpenSSL.writeString (bio, class);
  68                                       app (fn value =>
  69                                               (OpenSSL.writeInt (bio, 1);
  70                                                OpenSSL.writeString (bio, value))) values;
  71                                       OpenSSL.writeInt (bio, 0))) classes;
  72                              OpenSSL.writeInt (bio, 0))
  73       | MsgWhoHas {class, value} => (OpenSSL.writeInt (bio, 10);
  74                                      OpenSSL.writeString (bio, class);
  75                                      OpenSSL.writeString (bio, value))
  76       | MsgWhoHasResponse users => (OpenSSL.writeInt (bio, 11);
  77                                     app (fn user =>
  78                                             (OpenSSL.writeInt (bio, 1);
  79                                              OpenSSL.writeString (bio, user))) users;
  80                                     OpenSSL.writeInt (bio, 0))
  81
  82 fun checkIt v =
  83     case v of
  84         NONE => raise OpenSSL.OpenSSL "Bad Msg format"
  85       | _ => v
  86
  87 fun recv bio =
  88     case OpenSSL.readInt bio of
  89         NONE => NONE
  90       | SOME n =>
  91         checkIt (case n of
  92                      1 => SOME MsgOk
  93                    | 2 => Option.map MsgError (OpenSSL.readString bio)
  94                    | 3 => Option.map MsgConfig (OpenSSL.readString bio)
  95                    | 4 => (case (OpenSSL.readInt bio,
  96                                  OpenSSL.readString bio,
  97                                  OpenSSL.readString bio,
  98                                  OpenSSL.readString bio) of
  99                                (SOME action, SOME domain, SOME dir, SOME file) =>
 100                                SOME (MsgFile {action = i2a action,
 101                                               domain = domain,
 102                                               dir = dir,
 103                                               file = file})
 104                              | _ => NONE)
 105                    | 5 => SOME MsgDoFiles
 106                    | 6 => (case recvAcl bio of
 107                                SOME acl => SOME (MsgGrant acl)
 108                              | _ => NONE)
 109                    | 7 => (case recvAcl bio of
 110                                SOME acl => SOME (MsgRevoke acl)
 111                              | _ => NONE)
 112                    | 8 => (case OpenSSL.readString bio of
 113                                SOME user => SOME (MsgListPerms user)
 114                              | _ => NONE)
 115                    | 9 => let
 116                          fun loop classes =
 117                              case OpenSSL.readInt bio of
 118                                  SOME 0 => SOME (MsgPerms (rev classes))
 119                                | SOME 1 =>
 120                                  (case OpenSSL.readString bio of
 121                                       SOME class =>
 122                                       let
 123                                           fun loop' values =
 124                                               case OpenSSL.readInt bio of
 125                                                   SOME 0 => loop ((class, rev values) :: classes)
 126                                                 | SOME 1 =>
 127                                                   (case OpenSSL.readString bio of
 128                                                        SOME value => loop' (value :: values)
 129                                                      | NONE => NONE)
 130                                                 | _ => NONE
 131                                       in
 132                                           loop' []
 133                                       end
 134                                     | NONE => NONE)
 135                                | _ => NONE
 136                      in
 137                          loop []
 138                      end
 139                    | 10 => (case (OpenSSL.readString bio, OpenSSL.readString bio) of
 140                                 (SOME class, SOME value) => SOME (MsgWhoHas {class = class, value = value})
 141                               | _ => NONE)
 142                    | 11 => let
 143                          fun loop users =
 144                              case OpenSSL.readInt bio of
 145                                  SOME 0 => SOME (MsgWhoHasResponse (rev users))
 146                                | SOME 1 =>
 147                                  (case OpenSSL.readString bio of
 148                                       SOME user => loop (user :: users)
 149                                     | NONE => NONE)
 150                                | _ => NONE
 151                      in
 152                          loop []
 153                      end
 154                    | _ => NONE)
 155
 156 end