Attempt to move Dbms handling into slave
[hcoop/domtool2.git] / src / main.sml
index 4836ed8..cf53af0 100644 (file)
@@ -1,5 +1,5 @@
 (* HCoop Domtool (http://hcoop.sourceforge.net/)
- * Copyright (c) 2006-2007, Adam Chlipala
+ * Copyright (c) 2006-2009, Adam Chlipala
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -327,7 +327,7 @@ fun requestDir dname =
        val (_, files) = Order.order (SOME b) files
 
        val _ = if !ErrorMsg.anyErrors then
-                   (print "J\n";raise ErrorMsg.Error)
+                   raise ErrorMsg.Error
                else
                    ()
 
@@ -535,7 +535,9 @@ fun requestRmuser user =
 
 fun requestDbUser dbtype =
     let
-       val (_, bio) = requestBio (fn () => ())
+       val (_, context) = requestContext (fn () => ())
+       val bio = OpenSSL.connect true (context,
+                                       Config.Dbms.dbmsNode ^ ":" ^ Int.toString Config.slavePort)
     in
        Msg.send (bio, MsgCreateDbUser dbtype);
        case Msg.recv bio of
@@ -550,7 +552,9 @@ fun requestDbUser dbtype =
 
 fun requestDbPasswd rc =
     let
-       val (_, bio) = requestBio (fn () => ())
+       val (_, context) = requestContext (fn () => ())
+       val bio = OpenSSL.connect true (context,
+                                       Config.Dbms.dbmsNode ^ ":" ^ Int.toString Config.slavePort)
     in
        Msg.send (bio, MsgDbPasswd rc);
        case Msg.recv bio of
@@ -565,7 +569,9 @@ fun requestDbPasswd rc =
 
 fun requestDbTable p =
     let
-       val (user, bio) = requestBio (fn () => ())
+       val (user, context) = requestContext (fn () => ())
+       val bio = OpenSSL.connect true (context,
+                                       Config.Dbms.dbmsNode ^ ":" ^ Int.toString Config.slavePort)
     in
        Msg.send (bio, MsgCreateDb p);
        case Msg.recv bio of
@@ -580,7 +586,9 @@ fun requestDbTable p =
 
 fun requestDbDrop p =
     let
-       val (user, bio) = requestBio (fn () => ())
+       val (user, context) = requestContext (fn () => ())
+       val bio = OpenSSL.connect true (context,
+                                       Config.Dbms.dbmsNode ^ ":" ^ Int.toString Config.slavePort)
     in
        Msg.send (bio, MsgDropDb p);
        case Msg.recv bio of
@@ -595,7 +603,9 @@ fun requestDbDrop p =
 
 fun requestDbGrant p =
     let
-       val (user, bio) = requestBio (fn () => ())
+       val (user, context) = requestContext (fn () => ())
+       val bio = OpenSSL.connect true (context,
+                                       Config.Dbms.dbmsNode ^ ":" ^ Int.toString Config.slavePort)
     in
        Msg.send (bio, MsgGrantDb p);
        case Msg.recv bio of
@@ -927,6 +937,21 @@ fun requestDescribe dom =
        OpenSSL.close bio
     end
 
+fun requestReUsers () =
+    let
+       val (_, bio) = requestBio (fn () => ())
+    in
+       Msg.send (bio, MsgReUsers);
+       case Msg.recv bio of
+           NONE => print "Server closed connection unexpectedly.\n"
+         | SOME m =>
+           case m of
+               MsgOk => print "Callbacks run.\n"
+             | MsgError s => print ("Failed: " ^ s ^ "\n")
+             | _ => print "Unexpected server reply.\n";
+       OpenSSL.close bio
+    end
+
 structure SS = StringSet
 
 fun domainList dname =
@@ -1110,6 +1135,10 @@ val regenerateTc = regenerateEither true
                                    (fn G => fn evs => fn file =>
                                                          (#1 (check G file), evs))
 
+fun usersChanged () =
+    (Domain.onUsersChange ();
+     ignore (OS.Process.system Config.publish_reusers))
+
 fun rmuser user =
     let
        val doms = Acl.class {user = user, class = "domain"}
@@ -1119,7 +1148,8 @@ fun rmuser user =
                                     | _ => false) (StringSet.listItems doms)
     in
        Acl.rmuser user;
-       Domain.rmdom doms
+       Domain.rmdom doms;
+       usersChanged ()
     end
 
 fun now () = Date.toString (Date.fromTimeUniv (Time.now ()))
@@ -1142,6 +1172,43 @@ fun describeQuery q =
       | QSocket user => "Asked about socket permissions for user " ^ user
       | QFirewall user => "Asked about firewall rules for user " ^ user
 
+fun doIt' loop bio f cleanup =
+              ((case f () of
+                    (msgLocal, SOME msgRemote) => 
+                    (print msgLocal;
+                     print "\n";
+                     Msg.send (bio, MsgError msgRemote))
+                  | (msgLocal, NONE) =>
+                    (print msgLocal;
+                     print "\n";
+                     Msg.send (bio, MsgOk)))
+               handle e as (OpenSSL.OpenSSL s) =>
+                      (print ("OpenSSL error: " ^ s ^ "\n");
+                       app (fn x => print (x ^ "\n")) (SMLofNJ.exnHistory e);
+                       Msg.send (bio, MsgError ("OpenSSL error: " ^ s))
+                       handle OpenSSL.OpenSSL _ => ())
+                    | OS.SysErr (s, _) =>
+                      (print "System error: ";
+                       print s;
+                       print "\n";
+                       Msg.send (bio, MsgError ("System error: " ^ s))
+                       handle OpenSSL.OpenSSL _ => ())
+                    | Fail s =>
+                      (print "Failure: ";
+                       print s;
+                       print "\n";
+                       Msg.send (bio, MsgError ("Failure: " ^ s))
+                       handle OpenSSL.OpenSSL _ => ())
+                    | ErrorMsg.Error =>
+                      (print "Compilation error\n";
+                       Msg.send (bio, MsgError "Error during configuration evaluation")
+                       handle OpenSSL.OpenSSL _ => ());
+               (cleanup ();
+                ignore (OpenSSL.readChar bio);
+                OpenSSL.close bio)
+               handle OpenSSL.OpenSSL _ => ();
+               loop ())
+
 fun service () =
     let
        val host = Slave.hostname ()
@@ -1163,43 +1230,7 @@ fun service () =
                     val user = OpenSSL.peerCN bio
                     val () = print ("\nConnection from " ^ user ^ " at " ^ now () ^ "\n")
                     val () = Domain.setUser user
-
-                    fun doIt f cleanup =
-                        ((case f () of
-                              (msgLocal, SOME msgRemote) => 
-                              (print msgLocal;
-                               print "\n";
-                               Msg.send (bio, MsgError msgRemote))
-                            | (msgLocal, NONE) =>
-                              (print msgLocal;
-                               print "\n";
-                               Msg.send (bio, MsgOk)))
-                         handle e as (OpenSSL.OpenSSL s) =>
-                                (print ("OpenSSL error: " ^ s ^ "\n");
-                                 app (fn x => print (x ^ "\n")) (SMLofNJ.exnHistory e);
-                                 Msg.send (bio, MsgError ("OpenSSL error: " ^ s))
-                                 handle OpenSSL.OpenSSL _ => ())
-                              | OS.SysErr (s, _) =>
-                                (print "System error: ";
-                                 print s;
-                                 print "\n";
-                                 Msg.send (bio, MsgError ("System error: " ^ s))
-                                 handle OpenSSL.OpenSSL _ => ())
-                              | Fail s =>
-                                (print "Failure: ";
-                                 print s;
-                                 print "\n";
-                                 Msg.send (bio, MsgError ("Failure: " ^ s))
-                                 handle OpenSSL.OpenSSL _ => ())
-                              | ErrorMsg.Error =>
-                                (print "Compilation error\n";
-                                 Msg.send (bio, MsgError "Error during configuration evaluation")
-                                 handle OpenSSL.OpenSSL _ => ());
-                          (cleanup ();
-                          ignore (OpenSSL.readChar bio);
-                          OpenSSL.close bio)
-                         handle OpenSSL.OpenSSL _ => ();
-                         loop ())
+                    val doIt = doIt' loop bio
 
                     fun doConfig codes =
                         let
@@ -1265,6 +1296,10 @@ fun service () =
                                          if Acl.query {user = user, class = "priv", value = "all"} then
                                              (Acl.grant acl;
                                               Acl.write Config.aclFile;
+                                              if #class acl = "user" then
+                                                  usersChanged ()
+                                              else
+                                                  ();
                                               ("Granted permission " ^ #value acl ^ " to " ^ #user acl ^ " in " ^ #class acl ^ ".",
                                                NONE))
                                          else
@@ -1356,89 +1391,6 @@ fun service () =
                                               SOME "Not authorized to remove users"))
                                      (fn () => ())
 
-                              | MsgCreateDbUser {dbtype, passwd} =>
-                                doIt (fn () =>
-                                         case Dbms.lookup dbtype of
-                                             NONE => ("Database user creation request with unknown datatype type " ^ dbtype,
-                                                      SOME ("Unknown database type " ^ dbtype))
-                                           | SOME handler =>
-                                             case #adduser handler {user = user, passwd = passwd} of
-                                                 NONE => ("Added " ^ dbtype ^ " user " ^ user ^ ".",
-                                                          NONE)
-                                               | SOME msg =>
-                                                 ("Error adding a " ^ dbtype ^ " user " ^ user ^ ": " ^ msg,
-                                                  SOME ("Error adding user: " ^ msg)))
-                                     (fn () => ())
-
-                              | MsgDbPasswd {dbtype, passwd} =>
-                                doIt (fn () =>
-                                         case Dbms.lookup dbtype of
-                                             NONE => ("Database passwd request with unknown datatype type " ^ dbtype,
-                                                      SOME ("Unknown database type " ^ dbtype))
-                                           | SOME handler =>
-                                             case #passwd handler {user = user, passwd = passwd} of
-                                                 NONE => ("Changed " ^ dbtype ^ " password of user " ^ user ^ ".",
-                                                          NONE)
-                                               | SOME msg =>
-                                                 ("Error setting " ^ dbtype ^ " password of user " ^ user ^ ": " ^ msg,
-                                                  SOME ("Error adding user: " ^ msg)))
-                                     (fn () => ())
-
-                              | MsgCreateDb {dbtype, dbname, encoding} =>
-                                doIt (fn () =>
-                                         if Dbms.validDbname dbname then
-                                             case Dbms.lookup dbtype of
-                                                 NONE => ("Database creation request with unknown datatype type " ^ dbtype,
-                                                          SOME ("Unknown database type " ^ dbtype))
-                                               | SOME handler =>
-                                                 if not (Dbms.validEncoding encoding) then
-                                                     ("Invalid encoding " ^ valOf encoding ^ " requested for database creation.",
-                                                      SOME "Invalid encoding")
-                                                 else
-                                                     case #createdb handler {user = user, dbname = dbname, encoding = encoding} of
-                                                         NONE => ("Created database " ^ user ^ "_" ^ dbname ^ ".",
-                                                                  NONE)
-                                                       | SOME msg => ("Error creating database " ^ user ^ "_" ^ dbname ^ ": " ^ msg,
-                                                                      SOME ("Error creating database: " ^ msg))
-                                         else
-                                             ("Invalid database name " ^ user ^ "_" ^ dbname,
-                                              SOME ("Invalid database name " ^ dbname)))
-                                     (fn () => ())
-
-                              | MsgDropDb {dbtype, dbname} =>
-                                doIt (fn () =>
-                                         if Dbms.validDbname dbname then
-                                             case Dbms.lookup dbtype of
-                                                 NONE => ("Database drop request with unknown datatype type " ^ dbtype,
-                                                          SOME ("Unknown database type " ^ dbtype))
-                                               | SOME handler =>
-                                                 case #dropdb handler {user = user, dbname = dbname} of
-                                                     NONE => ("Drop database " ^ user ^ "_" ^ dbname ^ ".",
-                                                              NONE)
-                                                   | SOME msg => ("Error dropping database " ^ user ^ "_" ^ dbname ^ ": " ^ msg,
-                                                                  SOME ("Error dropping database: " ^ msg))
-                                         else
-                                             ("Invalid database name " ^ user ^ "_" ^ dbname,
-                                              SOME ("Invalid database name " ^ dbname)))
-                                     (fn () => ())
-
-                              | MsgGrantDb {dbtype, dbname} =>
-                                doIt (fn () =>
-                                         if Dbms.validDbname dbname then
-                                             case Dbms.lookup dbtype of
-                                                 NONE => ("Database drop request with unknown datatype type " ^ dbtype,
-                                                          SOME ("Unknown database type " ^ dbtype))
-                                               | SOME handler =>
-                                                 case #grant handler {user = user, dbname = dbname} of
-                                                     NONE => ("Grant permissions to database " ^ user ^ "_" ^ dbname ^ ".",
-                                                              NONE)
-                                                   | SOME msg => ("Error granting permissions to database " ^ user ^ "_" ^ dbname ^ ": " ^ msg,
-                                                                  SOME ("Error granting permissions to database: " ^ msg))
-                                         else
-                                             ("Invalid database name " ^ user ^ "_" ^ dbname,
-                                              SOME ("Invalid database name " ^ dbname)))
-                                     (fn () => ())
-
                               | MsgListMailboxes domain =>
                                 doIt (fn () =>
                                          if not (Domain.yourDomain domain) then
@@ -1555,14 +1507,15 @@ fun service () =
                                      (fn () => ())
 
                               | MsgMysqlFixperms =>
-                                doIt (fn () => if OS.Process.isSuccess
-                                                      (OS.Process.system "/usr/bin/sudo -H /afs/hcoop.net/common/etc/scripts/mysql-grant-table-drop") then
-                                                   ("Requested mysql-fixperms",
-                                                    NONE)
+                                (print "Starting mysql-fixperms\n";
+                                 doIt (fn () => if OS.Process.isSuccess
+                                                       (OS.Process.system "/usr/bin/sudo -H /afs/hcoop.net/common/etc/scripts/mysql-grant-table-drop") then
+                                                    ("Requested mysql-fixperms",
+                                                     NONE)
                                                 else
                                                     ("Requested mysql-fixperms, but execution failed!",
                                                      SOME "Script execution failed."))
-                                     (fn () => ())
+                                      (fn () => ()))
 
                               | MsgDescribe dom =>
                                 doIt (fn () => if not (Domain.validDomain dom) then
@@ -1578,6 +1531,16 @@ fun service () =
                                                      NONE)))
                                      (fn () => ())
 
+                              | MsgReUsers =>
+                                doIt (fn () => if Acl.query {user = user, class = "priv", value = "regen"}
+                                                  orelse Acl.query {user = user, class = "priv", value = "all"} then
+                                                   (usersChanged ();
+                                                    ("Users change callbacks run", NONE))
+                                               else
+                                                   ("Unauthorized user asked to reusers!",
+                                                    SOME "You aren't authorized to regenerate files."))
+                                     (fn () => ())
+
                               | _ =>
                                 doIt (fn () => ("Unexpected command",
                                                 SOME "Unexpected command"))
@@ -1648,69 +1611,172 @@ fun slave () =
        val _ = print ("Slave server starting at " ^ now () ^ "\n")
 
        fun loop () =
-           case OpenSSL.accept sock of
-               NONE => ()
-             | SOME bio =>
-               let
-                   val peer = OpenSSL.peerCN bio
-                   val () = print ("\nConnection from " ^ peer ^ " at " ^ now () ^ "\n")
-               in
-                   if peer = Config.dispatcherName then let
-                           fun loop' files =
-                               case Msg.recv bio of
-                                   NONE => print "Dispatcher closed connection unexpectedly\n"
-                                 | SOME m =>
-                                   case m of
-                                       MsgFile file => loop' (file :: files)
-                                     | MsgDoFiles => (Slave.handleChanges files;
-                                                      Msg.send (bio, MsgOk))
-                                     | MsgRegenerate => (Domain.resetLocal ();
-                                                         Msg.send (bio, MsgOk))
-                                     | _ => (print "Dispatcher sent unexpected command\n";
-                                             Msg.send (bio, MsgError "Unexpected command"))
-                       in
-                           loop' [];
-                           ignore (OpenSSL.readChar bio);
-                           OpenSSL.close bio;
-                           loop ()
-                       end
-                   else if peer = "domtool" then
-                       case Msg.recv bio of
-                           SOME MsgShutdown => (OpenSSL.close bio;
-                                                print ("Shutting down at " ^ now () ^ "\n\n"))
-                         | _ => (OpenSSL.close bio;
-                                 loop ())
-                   else
-                       case Msg.recv bio of
-                           SOME (MsgQuery q) => (print (describeQuery q ^ "\n");
-                                                 Msg.send (bio, answerQuery q);
-                                                 ignore (OpenSSL.readChar bio);
-                                                 OpenSSL.close bio;
-                                                 loop ())
-                         | _ => (OpenSSL.close bio;
-                                 loop ())
-               end handle OpenSSL.OpenSSL s =>
-                          (print ("OpenSSL error: " ^ s ^ "\n");
-                           OpenSSL.close bio
+           (case OpenSSL.accept sock of
+                NONE => ()
+              | SOME bio =>
+                let
+                    val peer = OpenSSL.peerCN bio
+                    val () = print ("\nConnection from " ^ peer ^ " at " ^ now () ^ "\n")
+                in
+                    if peer = Config.dispatcherName then let
+                            fun loop' files =
+                                case Msg.recv bio of
+                                    NONE => print "Dispatcher closed connection unexpectedly\n"
+                                  | SOME m =>
+                                    case m of
+                                        MsgFile file => loop' (file :: files)
+                                      | MsgDoFiles => (Slave.handleChanges files;
+                                                       Msg.send (bio, MsgOk))
+                                      | MsgRegenerate => (Domain.resetLocal ();
+                                                          Msg.send (bio, MsgOk))
+                                      | MsgVmailChanged => (if Vmail.doChanged () then
+                                                                Msg.send (bio, MsgOk)
+                                                            else
+                                                                Msg.send (bio, MsgError "userdb update failed"))
+                                      | _ => (print "Dispatcher sent unexpected command\n";
+                                              Msg.send (bio, MsgError "Unexpected command"))
+                        in
+                            loop' [];
+                            ignore (OpenSSL.readChar bio);
+                            OpenSSL.close bio;
+                            loop ()
+                        end
+                    else if peer = "domtool" then
+                        case Msg.recv bio of
+                            SOME MsgShutdown => (OpenSSL.close bio;
+                                                 print ("Shutting down at " ^ now () ^ "\n\n"))
+                          | _ => (OpenSSL.close bio;
+                                  loop ())
+                    else
+                        let
+                            val doIt = doIt' loop bio
+                            val user = peer
+                        in
+                            case Msg.recv bio of
+                                NONE => (OpenSSL.close bio
                                          handle OpenSSL.OpenSSL _ => ();
-                           loop ())
-                        | e as OS.SysErr (s, _) =>
-                          (app (fn s => print (s ^ "\n")) (SMLofNJ.exnHistory e);
-                           print ("System error: "^ s ^ "\n");
-                           OpenSSL.close bio
-                           handle OpenSSL.OpenSSL _ => ();
-                           loop ())
-                        | IO.Io {function, name, ...} =>
-                          (print ("IO error: " ^ function ^ ": " ^ name ^ "\n");
-                           OpenSSL.close bio
-                           handle OpenSSL.OpenSSL _ => ();
-                           loop ())
-                        | e =>
-                          (app (fn s => print (s ^ "\n")) (SMLofNJ.exnHistory e);
-                           print "Uncaught exception!\n";
-                           OpenSSL.close bio
-                           handle OpenSSL.OpenSSL _ => ();
-                           loop ())
+                                         loop ())
+                              | SOME m =>
+                                case m of 
+                                    (MsgQuery q) => (print (describeQuery q ^ "\n");
+                                                     Msg.send (bio, answerQuery q);
+                                                     ignore (OpenSSL.readChar bio);
+                                                     OpenSSL.close bio;
+                                                     loop ())
+                                  | MsgCreateDbUser {dbtype, passwd} =>
+                                    doIt (fn () =>
+                                             case Dbms.lookup dbtype of
+                                                 NONE => ("Database user creation request with unknown datatype type " ^ dbtype,
+                                                          SOME ("Unknown database type " ^ dbtype))
+                                               | SOME handler =>
+                                                 case #adduser handler {user = user, passwd = passwd} of
+                                                     NONE => ("Added " ^ dbtype ^ " user " ^ user ^ ".",
+                                                              NONE)
+                                                   | SOME msg =>
+                                                     ("Error adding a " ^ dbtype ^ " user " ^ user ^ ": " ^ msg,
+                                                      SOME ("Error adding user: " ^ msg)))
+                                         (fn () => ())
+
+                                  | MsgDbPasswd {dbtype, passwd} =>
+                                    doIt (fn () =>
+                                             case Dbms.lookup dbtype of
+                                                 NONE => ("Database passwd request with unknown datatype type " ^ dbtype,
+                                                          SOME ("Unknown database type " ^ dbtype))
+                                               | SOME handler =>
+                                                 case #passwd handler {user = user, passwd = passwd} of
+                                                     NONE => ("Changed " ^ dbtype ^ " password of user " ^ user ^ ".",
+                                                              NONE)
+                                                   | SOME msg =>
+                                                     ("Error setting " ^ dbtype ^ " password of user " ^ user ^ ": " ^ msg,
+                                                      SOME ("Error adding user: " ^ msg)))
+                                         (fn () => ())
+
+                                  | MsgCreateDb {dbtype, dbname, encoding} =>
+                                    doIt (fn () =>
+                                             if Dbms.validDbname dbname then
+                                                 case Dbms.lookup dbtype of
+                                                     NONE => ("Database creation request with unknown datatype type " ^ dbtype,
+                                                              SOME ("Unknown database type " ^ dbtype))
+                                                   | SOME handler =>
+                                                     if not (Dbms.validEncoding encoding) then
+                                                         ("Invalid encoding " ^ valOf encoding ^ " requested for database creation.",
+                                                          SOME "Invalid encoding")
+                                                     else
+                                                         case #createdb handler {user = user, dbname = dbname, encoding = encoding} of
+                                                             NONE => ("Created database " ^ user ^ "_" ^ dbname ^ ".",
+                                                                      NONE)
+                                                           | SOME msg => ("Error creating database " ^ user ^ "_" ^ dbname ^ ": " ^ msg,
+                                                                          SOME ("Error creating database: " ^ msg))
+                                             else
+                                                 ("Invalid database name " ^ user ^ "_" ^ dbname,
+                                                  SOME ("Invalid database name " ^ dbname)))
+                                         (fn () => ())
+
+                                  | MsgDropDb {dbtype, dbname} =>
+                                    doIt (fn () =>
+                                             if Dbms.validDbname dbname then
+                                                 case Dbms.lookup dbtype of
+                                                     NONE => ("Database drop request with unknown datatype type " ^ dbtype,
+                                                              SOME ("Unknown database type " ^ dbtype))
+                                                   | SOME handler =>
+                                                     case #dropdb handler {user = user, dbname = dbname} of
+                                                         NONE => ("Drop database " ^ user ^ "_" ^ dbname ^ ".",
+                                                                  NONE)
+                                                       | SOME msg => ("Error dropping database " ^ user ^ "_" ^ dbname ^ ": " ^ msg,
+                                                                      SOME ("Error dropping database: " ^ msg))
+                                             else
+                                                 ("Invalid database name " ^ user ^ "_" ^ dbname,
+                                                  SOME ("Invalid database name " ^ dbname)))
+                                         (fn () => ())
+
+                                  | MsgGrantDb {dbtype, dbname} =>
+                                    doIt (fn () =>
+                                             if Dbms.validDbname dbname then
+                                                 case Dbms.lookup dbtype of
+                                                     NONE => ("Database drop request with unknown datatype type " ^ dbtype,
+                                                              SOME ("Unknown database type " ^ dbtype))
+                                                   | SOME handler =>
+                                                     case #grant handler {user = user, dbname = dbname} of
+                                                         NONE => ("Grant permissions to database " ^ user ^ "_" ^ dbname ^ ".",
+                                                                  NONE)
+                                                       | SOME msg => ("Error granting permissions to database " ^ user ^ "_" ^ dbname ^ ": " ^ msg,
+                                                                      SOME ("Error granting permissions to database: " ^ msg))
+                                             else
+                                                 ("Invalid database name " ^ user ^ "_" ^ dbname,
+                                                  SOME ("Invalid database name " ^ dbname)))
+                                         (fn () => ())
+                                  | _ => (OpenSSL.close bio;
+                                          loop ())
+                        end
+                end handle OpenSSL.OpenSSL s =>
+                           (print ("OpenSSL error: " ^ s ^ "\n");
+                            OpenSSL.close bio
+                            handle OpenSSL.OpenSSL _ => ();
+                            loop ())
+                         | e as OS.SysErr (s, _) =>
+                           (app (fn s => print (s ^ "\n")) (SMLofNJ.exnHistory e);
+                            print ("System error: "^ s ^ "\n");
+                            OpenSSL.close bio
+                            handle OpenSSL.OpenSSL _ => ();
+                            loop ())
+                         | IO.Io {function, name, ...} =>
+                           (print ("IO error: " ^ function ^ ": " ^ name ^ "\n");
+                            OpenSSL.close bio
+                            handle OpenSSL.OpenSSL _ => ();
+                            loop ())
+                         | e =>
+                           (app (fn s => print (s ^ "\n")) (SMLofNJ.exnHistory e);
+                            print "Uncaught exception!\n";
+                            OpenSSL.close bio
+                            handle OpenSSL.OpenSSL _ => ();
+                            loop ()))
+           handle OpenSSL.OpenSSL s =>
+                  (print ("OpenSSL error: " ^ s ^ "\n");
+                   loop ())
+                | e =>
+                  (app (fn s => print (s ^ "\n")) (SMLofNJ.exnHistory e);
+                   print "Uncaught exception!\n";
+                   loop ())
     in
        loop ();
        OpenSSL.shutdown sock