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/*******************************************************************************
* Copyright (c) 2017 Politecnico di Torino and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Apache License, Version 2.0
* which accompanies this distribution, and is available at
* http://www.apache.org/licenses/LICENSE-2.0
*******************************************************************************/
package mcnet.netobjs;
import java.util.ArrayList;
import java.util.List;
import com.microsoft.z3.BoolExpr;
import com.microsoft.z3.Context;
import com.microsoft.z3.DatatypeExpr;
import com.microsoft.z3.Expr;
import com.microsoft.z3.FuncDecl;
import com.microsoft.z3.IntExpr;
import com.microsoft.z3.Solver;
import mcnet.components.NetContext;
import mcnet.components.Network;
import mcnet.components.NetworkObject;
/**
* WebServer object
*
*/
public class PolitoWebServer extends NetworkObject{
List<BoolExpr> constraints;
Context ctx;
DatatypeExpr node;
Network net;
NetContext nctx;
FuncDecl isInBlacklist;
public PolitoWebServer(Context ctx, Object[]... args) {
super(ctx, args);
}
@Override
protected void init(Context ctx, Object[]... args) {
this.ctx = ctx;
isEndHost=true;
constraints = new ArrayList<BoolExpr>();
z3Node = ((NetworkObject)args[0][0]).getZ3Node();
node = z3Node;
net = (Network)args[0][1];
nctx = (NetContext)args[0][2];
webServerRules();
}
@Override
public DatatypeExpr getZ3Node() {
return node;
}
@Override
protected void addConstraints(Solver solver) {
BoolExpr[] constr = new BoolExpr[constraints.size()];
solver.add(constraints.toArray(constr));
}
private void webServerRules (){
Expr n_0 = ctx.mkConst("webserver_"+node+"_n_0", nctx.node);
Expr p_0 = ctx.mkConst("webserver_"+node+"_p_0", nctx.packet);
Expr p_1 = ctx.mkConst("webserver_"+node+"_p_1", nctx.packet);
IntExpr t_0 = ctx.mkIntConst("webserver_"+node+"_t_0");
IntExpr t_1 = ctx.mkIntConst("webserver_"+node+"_t_1");
//Constraint1 send(politoWebServer, n_0, p, t_0) -> nodeHasAddr(politoWebServer,p.src)
constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
ctx.mkImplies((BoolExpr)nctx.send.apply(node, n_0, p_0, t_0),
(BoolExpr)nctx.nodeHasAddr.apply(node,nctx.pf.get("src").apply(p_0))),1,null,null,null,null));
//Constraint2 send(politoWebServer, n_0, p, t_0) -> p.origin == politoWebServer
constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
ctx.mkImplies((BoolExpr)nctx.send.apply(node, n_0, p_0, t_0),
ctx.mkEq(nctx.pf.get("origin").apply(p_0),node)),1,null,null,null,null));
//Constraint3 send(politoWebServer, n_0, p, t_0) -> p.orig_body == p.body
constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
ctx.mkImplies((BoolExpr)nctx.send.apply(node, n_0, p_0, t_0),
ctx.mkEq(nctx.pf.get("orig_body").apply(p_0),nctx.pf.get("body").apply(p_0))),
1,null,null,null,null));
//Constraint4 recv(n_0, politoWebServer, p, t_0) -> nodeHasAddr(politoWebServer,p.dest)
constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
ctx.mkImplies((BoolExpr)nctx.recv.apply(n_0,node, p_0, t_0),
(BoolExpr)nctx.nodeHasAddr.apply(node,nctx.pf.get("dest").apply(p_0))),1,null,null,null,null));
//Constraint5
// send(politoWebServer, n_0, p, t_0) ->
// (exist p_1,t_1 :
// (t_1 < t_0 && recv(n_0, politoWebServer, p_1, t_1) &&
// p_0.proto == HTTP_RESP && p_1.proto == HTTP_REQ &&
// p_0.dest == p_1.src && p_0.src == p_1.dest && p_0.url == p_1.url)
constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
ctx.mkImplies((BoolExpr)nctx.send.apply(node, n_0, p_0, t_0),
ctx.mkExists(new Expr[]{p_1, t_1},
ctx.mkAnd(
ctx.mkLt(t_1, t_0),
ctx.mkEq(nctx.pf.get("url").apply(p_0), nctx.pf.get("url").apply(p_1)),
(BoolExpr)nctx.recv.apply(n_0, node, p_1, t_1),
ctx.mkEq(nctx.pf.get("proto").apply(p_0), ctx.mkInt(nctx.HTTP_RESPONSE)),
ctx.mkEq(nctx.pf.get("proto").apply(p_1), ctx.mkInt(nctx.HTTP_REQUEST)),
ctx.mkEq(nctx.pf.get("dest").apply(p_0), nctx.pf.get("src").apply(p_1)),
ctx.mkEq(nctx.pf.get("src").apply(p_0), nctx.pf.get("dest").apply(p_1))),
1,null,null,null,null)),1,null,null,null,null));
}
}
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