1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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7 * published by the Free Software Foundation.
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13 * accompanied this code).
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22 */
23
24 /* @test
25 * @bug 4203167
26 *
27 * @summary RMI blocks in HttpAwareServerSocket.accept() if you telnet to it
28 * @author Adrian Colley
29 *
30 * @library ../../../../../java/rmi/testlibrary
31 * @modules java.rmi/sun.rmi.transport.proxy
32 * @build TestIface TestImpl TestImpl_Stub
33 * @run main/othervm/policy=security.policy/timeout=60 BlockAcceptTest
34 */
35
36 /* This test attempts to stymie the RMI accept loop. The accept loop in
37 * RMI endlessly accepts a connection, spawns a thread for it, and repeats.
38 * The accept() call can be replaced by a user-supplied library which
39 * might foolishly block indefinitely in its accept() method, which would
40 * prevent RMI from accepting other connections on that socket.
41 *
42 * Unfortunately, HttpAwareServerSocket (default server socket) is/was such
43 * a foolish thing. It reads 4 bytes to see if they're "POST" before
44 * returning. The bug fix is to move the HTTP stuff into the mainloop,
45 * which has the side effect of enabling it for non-default socketfactories.
46 *
47 * This test:
48 * 1. Creates an object and exports it.
49 * 2. Connects to the listening RMI port and sends nothing, to hold it up.
50 * 3. Makes a regular call, using HTTP tunnelling.
51 * 4. Fails to deadlock, thereby passing the test.
52 *
53 * Some runtime dependencies I'm trying to eliminate:
54 * 1. We don't know the port number until after exporting the object, but
55 * have to set it in http.proxyPort somehow. Hopefully http.proxyPort
56 * isn't read too soon or this test will fail with a ConnectException.
57 */
58
59 import java.rmi.*;
60 import java.rmi.server.RMISocketFactory;
61 import java.io.*;
62 import java.net.*;
63
64 import sun.rmi.transport.proxy.RMIMasterSocketFactory;
65 import sun.rmi.transport.proxy.RMIHttpToPortSocketFactory;
66
67 public class BlockAcceptTest
68 {
69 public static void main(String[] args)
70 throws Exception
71 {
72 // Make trouble for ourselves
73 if (System.getSecurityManager() == null)
74 System.setSecurityManager(new RMISecurityManager());
75
76 // HTTP direct to the server port
77 System.setProperty("http.proxyHost", "127.0.0.1");
78
79 // Set the socket factory.
80 System.err.println("(installing HTTP-out socket factory)");
81 HttpOutFactory fac = new HttpOutFactory();
82 RMISocketFactory.setSocketFactory(fac);
83
84 // Create remote object
85 TestImpl impl = new TestImpl();
86
87 // Export and get which port.
88 System.err.println("(exporting remote object)");
89 TestIface stub = impl.export();
90 try {
91 int port = fac.whichPort();
92
93 // Sanity
94 if (port == 0)
95 throw new Error("TEST FAILED: export didn't reserve a port(?)");
96
97 // Set the HTTP port, at last.
98 System.setProperty("http.proxyPort", port+"");
99
100 // Now, connect to that port
101 //Thread.sleep(2000);
102 System.err.println("(connecting to listening port on 127.0.0.1:" +
103 port + ")");
104 Socket DoS = new Socket("127.0.0.1", port);
105 // we hold the connection open until done with the test.
106
107 // The test itself: make a remote call and see if it's blocked or
108 // if it works
109 //Thread.sleep(2000);
110 System.err.println("(making RMI-through-HTTP call)");
111 System.err.println("(typical test failure deadlocks here)");
112 String result = stub.testCall("dummy load");
113
114 System.err.println(" => " + result);
115 if (!("OK".equals(result)))
116 throw new Error("TEST FAILED: result not OK");
117 System.err.println("Test passed.");
118
119 // Clean up, including writing a byte to that connection just in
120 // case an optimizer thought of optimizing it out of existence
121 try {
122 DoS.getOutputStream().write(0);
123 DoS.getOutputStream().close();
124 } catch (Throwable apathy) {
125 }
126
127 } finally {
128 try {
129 impl.unexport();
130 } catch (Throwable unmatter) {
131 }
132 }
133
134 // Should exit here
135 }
136
137 private static class HttpOutFactory
138 extends RMISocketFactory
139 {
140 private int servport = 0;
141
142 public Socket createSocket(String h, int p)
143 throws IOException
144 {
145 return ((new RMIHttpToPortSocketFactory()).createSocket(h, p));
146 }
147
148 /** Create a server socket and remember which port it's on.
149 * Aborts if createServerSocket(0) is called twice, because then
150 * it doesn't know whether to remember the first or second port.
151 */
152 public ServerSocket createServerSocket(int p)
153 throws IOException
154 {
155 ServerSocket ss;
156 ss = (new RMIMasterSocketFactory()).createServerSocket(p);
157 if (p == 0) {
158 if (servport != 0) {
159 System.err.println("TEST FAILED: " +
160 "Duplicate createServerSocket(0)");
161 throw new Error("Test aborted (createServerSocket)");
162 }
163 servport = ss.getLocalPort();
164 }
165 return (ss);
166 }
167
168 /** Return which port was reserved by createServerSocket(0).
169 * If the return value was 0, createServerSocket(0) wasn't called.
170 */
171 public int whichPort() {
172 return (servport);
173 }
174 } // end class HttpOutFactory
175 }