1 /*******************************************************************************
2 * Copyright (c) 2017 Politecnico di Torino and others.
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Apache License, Version 2.0
6 * which accompanies this distribution, and is available at
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *******************************************************************************/
10 package mcnet.netobjs;
12 import java.util.ArrayList;
13 import java.util.List;
15 import com.microsoft.z3.BoolExpr;
16 import com.microsoft.z3.Context;
17 import com.microsoft.z3.DatatypeExpr;
18 import com.microsoft.z3.Expr;
19 import com.microsoft.z3.IntExpr;
20 import com.microsoft.z3.Solver;
22 import mcnet.components.NetContext;
23 import mcnet.components.Network;
24 import mcnet.components.NetworkObject;
26 * End host network objects
29 public class EndHost extends NetworkObject{
31 List<BoolExpr> constraints;
37 public EndHost(Context ctx, Object[]... args) {
42 protected void init(Context ctx, Object[]... args) {
45 constraints = new ArrayList<BoolExpr>();
46 z3Node = ((NetworkObject)args[0][0]).getZ3Node();
48 net = (Network)args[0][1];
49 nctx = (NetContext)args[0][2];
54 public DatatypeExpr getZ3Node() {
59 protected void addConstraints(Solver solver) {
60 BoolExpr[] constr = new BoolExpr[constraints.size()];
61 solver.add(constraints.toArray(constr));
64 public void endHostRules (){
65 Expr n_0 = ctx.mkConst("eh_"+node+"_n_0", nctx.node);
66 IntExpr t_0 = ctx.mkIntConst("eh_"+node+"_t_0");
67 Expr p_0 = ctx.mkConst("eh_"+node+"_p_0", nctx.packet);
69 //Constraint1 send(node, n_0, p, t_0) -> nodeHasAddr(node,p.src)
71 ctx.mkForall(new Expr[]{n_0, p_0, t_0},
73 (BoolExpr)nctx.send.apply( new Expr[]{ node, n_0, p_0, t_0}),
74 (BoolExpr)nctx.nodeHasAddr.apply(new Expr[]{node, nctx.pf.get("src").apply(p_0)})),1,null,null,null,null));
75 //Constraint2 send(node, n_0, p, t_0) -> p.origin == node
77 ctx.mkForall(new Expr[]{n_0, p_0, t_0},
79 (BoolExpr)nctx.send.apply( new Expr[]{ node, n_0, p_0, t_0}),
80 ctx.mkEq(nctx.pf.get("origin").apply(p_0),node)),1,null,null,null,null));
81 //Constraint3 send(node, n_0, p, t_0) -> p.orig_body == p.body
83 ctx.mkForall(new Expr[]{n_0, p_0, t_0},
85 (BoolExpr)nctx.send.apply(new Expr[]{ node, n_0, p_0, t_0}),
86 ctx.mkEq(nctx.pf.get("orig_body").apply(p_0),nctx.pf.get("body").apply(p_0))),1,null,null,null,null));
87 //Constraint4 recv(n_0, node, p, t_0) -> nodeHasAddr(node,p.dest)
89 ctx.mkForall(new Expr[]{n_0, p_0, t_0},
91 (BoolExpr)nctx.recv.apply( new Expr[]{ n_0, node, p_0, t_0}),
92 (BoolExpr)nctx.nodeHasAddr.apply(new Expr[]{node, nctx.pf.get("dest").apply(p_0)})),1,null,null,null,null));
94 // Just a try: here we state that an endhost is not able to issue a HTTP response traffic
95 // See PolitoCache.py model for constants definition (2 means HTTP_RESPONSE, 1 means HTTP_REQUEST)
96 // constraints.add(ctx.mkForall(new Expr[]{n_0, p_0, t_0},
97 // ctx.mkImplies((BoolExpr)nctx.send.apply(node, n_0, p_0, t_0),
98 // ctx.mkEq(nctx.pf.get("proto").apply(p_0), ctx.mkInt(1))),1,null,null,null,null));