Posted on 2009-10-15 20:09
云自無心水自閑 閱讀(11315)
評論(16) 編輯 收藏 所屬分類:
Java 、
心得體會
JavaRebel是一個工具，主要是用于熱加載，比如說在Tomcat之類的應用服務器中，更新了class或者某些資源文件，使用了JRebel之后，就不需要重新啟動應用服務器。這對于開發的人來說，是特別方便的。當然Java也提供了HotSpot的JVM，但是如果你修改的類中有方法名稱變動的話，HotSpot就無能為力了，必須要重要啟動應用服務器。
這里有一點先聲明一下，本文只是破解僅限于學習和研究使用，勿用于其他用途。
第一步當然是下載JRebel
下載地址：http://www.zeroturnaround.com/jrebel/download/
下載下來的是一個Zip壓縮包，打開之后會發現一個jrebel.jar，這就是其最重要的運行包了。其他都是一些文檔和插件。
第二步，是進行反編譯。
我推薦一個工具：http://java.decompiler.free.fr/，分成Eclipse插件和單獨的運行程序兩種，我下載的是單獨的運行程序，只有一個綠色的exe文件，點擊后直接運行。
看了一下，最顯眼的自然是UserLicense類了。
1
package com.zeroturnaround.licensing;
2
3import java.io.Serializable;
4import java.util.Map;
5
6public class UserLicense
7 implements Serializable
8
{
9
static final long serialVersionUID = 1L;
10 private byte[] signature;
11 private byte[] license;
12 private Map dataMap;
13
14 public byte[] getSignature()
15
{
16 return this.signature;
17
}
18
19 public void setSignature(byte[] paramArrayOfByte) {
20 this.signature = paramArrayOfByte;
21 }
22
23 public byte[] getLicense() {
24 return this.license;
25 }
26
27 public void setLicense(byte[] paramArrayOfByte) {
28 this.license = paramArrayOfByte;
29 }
30
}
31
然后就找到了調用getLicense方法的jS類（名字很奇怪，因為是混淆過的原因，jS類反編譯后的源碼附在最后面了）
這個類中很明確地顯示了License的獲取方法。
首先是：jreble.lic文件，用winrar打開jrebel.jar就看到這個文件了。
從源碼來看，UserLicense是用ObjectInputStream通過ReadObject得到了。
然后，屬性license里面其實是一個Map，用ObjectInputStream從ByteArrayInputSteam中通過ReadObject得到。于是寫了下面這樣的測試代碼
1package temp.jrebel;
2
3import java.io.BufferedInputStream;
4import java.io.BufferedOutputStream;
5import java.io.ByteArrayInputStream;
6import java.io.ByteArrayOutputStream;
7import java.io.File;
8import java.io.FileInputStream;
9import java.io.FileOutputStream;
10import java.io.IOException;
11import java.io.ObjectInputStream;
12import java.io.ObjectOutputStream;
13import java.util.Calendar;
14import java.util.GregorianCalendar;
15import java.util.Iterator;
16import java.util.Map;
17import junit.framework.Assert;
18import org.junit.Test;
19import com.zeroturnaround.licensing.UserLicense;
20
21public class ParseLicense {
22 @Test
23 public void parseLicenseFile() {
24 Object localObject1 = null;
25 try {
26 System.out.println("start to get lic file.");
27 File localFile2 = new File("d:\\temp\\jrebel.lic");
28 Assert.assertNotNull(localFile2);
29
30 System.out.println("start to get objectInputStream.");
31 localObject1 = new ObjectInputStream(new BufferedInputStream(
32 new FileInputStream(localFile2)));
33 Assert.assertNotNull(localObject1);
34
35 System.out.println("start to get userLicense.");
36 UserLicense localUserLicense1 = (UserLicense)((ObjectInputStream)localObject1).readObject();
37 Assert.assertNotNull(localUserLicense1);
38
39 System.out.println("start to get ObjectInputStream2.");
40 ObjectInputStream localObjectInputStream = new ObjectInputStream(new ByteArrayInputStream(localUserLicense1.getLicense()));
41 Assert.assertNotNull(localObjectInputStream);
42
43 System.out.println("start to get localMap.");
44 Map localMap = (Map)localObjectInputStream.readObject();
45 Assert.assertNotNull(localMap);
46
47 System.out.println("start tot output value.");
48 for ( Iterator<?> iter = localMap.keySet().iterator(); iter.hasNext(); ) {
49 String key = (String)iter.next();
50 System.out.println("key: " + key + ", value: " + localMap.get(key));
51 }
52
53 } catch (Exception e) {
54 e.printStackTrace();
55 Assert.fail("faile to parse license. ");
56 } finally {
57 if (localObject1 != null) {
58 try {
59 ((ObjectInputStream) localObject1).close();
60 } catch (IOException localIOException12) {
61 }
62 }
63 }
64
65 }
66}
67
68
Concole中果然如我所愿地，把Map里的值都打印出來了。到了這一步，剩下的就簡單了，把Map里面的validateUntil屬性的日期換一下，重新生成一個License文件就行了。
把上面的代碼修改一下，很容易地就生成了新的License文件。
原來License里面的試用期只有一個月，比如，我是2009-10-15下載的，那么這個jrebel.lic文件里的validateUntil日期就是11月14日，現在我把他改成了明年元旦。
1package temp.jrebel;
2
3import java.io.BufferedInputStream;
4import java.io.BufferedOutputStream;
5import java.io.ByteArrayInputStream;
6import java.io.ByteArrayOutputStream;
7import java.io.File;
8import java.io.FileInputStream;
9import java.io.FileOutputStream;
10import java.io.IOException;
11import java.io.ObjectInputStream;
12import java.io.ObjectOutputStream;
13import java.util.Calendar;
14import java.util.GregorianCalendar;
15import java.util.Iterator;
16import java.util.Map;
17import junit.framework.Assert;
18import org.junit.Test;
19import com.zeroturnaround.licensing.UserLicense;
20
21public class ParseLicense {
22 @Test
23 public void parseLicenseFile() {
24 Object localObject1 = null;
25 try {
26 System.out.println("start to get lic file.");
27 File localFile2 = new File("d:\\temp\\jrebel.lic");
28 Assert.assertNotNull(localFile2);
29
30 System.out.println("start to get objectInputStream.");
31 localObject1 = new ObjectInputStream(new BufferedInputStream(
32 new FileInputStream(localFile2)));
33 Assert.assertNotNull(localObject1);
34
35 System.out.println("start to get userLicense.");
36 UserLicense localUserLicense1 = (UserLicense)((ObjectInputStream)localObject1).readObject();
37 Assert.assertNotNull(localUserLicense1);
38
39 System.out.println("start to get ObjectInputStream2.");
40 ObjectInputStream localObjectInputStream = new ObjectInputStream(new ByteArrayInputStream(localUserLicense1.getLicense()));
41 Assert.assertNotNull(localObjectInputStream);
42
43 System.out.println("start to get localMap.");
44 Map localMap = (Map)localObjectInputStream.readObject();
45 Assert.assertNotNull(localMap);
46
47 System.out.println("start tot output value.");
48 for ( Iterator<?> iter = localMap.keySet().iterator(); iter.hasNext(); ) {
49 String key = (String)iter.next();
50 System.out.println("key: " + key + ", value: " + localMap.get(key));
51 }
52
53
54 System.out.println("start to change date.");
55 Calendar cal = new GregorianCalendar(2010, 01, 01);
56 localMap.put("validUntil", cal.getTime());
57
58 System.out.println("start to set a new date to license.");
59 ByteArrayOutputStream out1 = new ByteArrayOutputStream();
60 ObjectOutputStream out2 = new ObjectOutputStream(out1);
61 out2.writeObject(localMap);
62 out1.toByteArray();
63 localUserLicense1.setLicense(out1.toByteArray());
64 out1.close();
65 out2.close();
66
67
68 System.out.println("start to get ObjectInputStream2.");
69 localObjectInputStream = new ObjectInputStream(new ByteArrayInputStream(localUserLicense1.getLicense()));
70 Assert.assertNotNull(localObjectInputStream);
71
72 System.out.println("start to get localMap.");
73 localMap = (Map)localObjectInputStream.readObject();
74 Assert.assertNotNull(localMap);
75
76 for ( Iterator<?> iter = localMap.keySet().iterator(); iter.hasNext(); ) {
77 String key = (String)iter.next();
78 System.out.println("key: " + key + ", value: " + localMap.get(key));
79 }
80
81
82 String newLicenseFile = "d:\\temp\\new.lic";
83 ObjectOutputStream out3 = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(newLicenseFile)));
84 out3.writeObject(localUserLicense1);
85 out3.close();
86
87 } catch (Exception e) {
88 e.printStackTrace();
89 Assert.fail("faile to parse license. ");
90 } finally {
91 if (localObject1 != null) {
92 try {
93 ((ObjectInputStream) localObject1).close();
94 } catch (IOException localIOException12) {
95 }
96 }
97 }
98
99 }
100}
101
102
103
這是我用反編譯工具反編譯出來的部分源碼：
/* */ package com.zeroturnaround.javarebel;
/* */ public class jS
/* */ implements dn
/* 405 */ if (localUserLicense != null) {
/* */ try {
/* 407 */ if (eO.a(localUserLicense)) {
/* 408 */ jdField_a_of_type_Int = 1;
/* */ }
/* 410 */ ObjectInputStream localObjectInputStream = new ObjectInputStream(new ByteArrayInputStream(localUserLicense.getLicense()));
/* 411 */ localMap = (Map)localObjectInputStream.readObject();
/* 412 */ localObjectInputStream.close();
/* */
/* 414 */ if ((!("JavaRebel".equals(localMap.get("Product")))) && (!("JRebel".equals(localMap.get("Product"))))) {
/* 415 */ jdField_a_of_type_Int = 0;
/* */ }
/* 417 */ iH.log("License information: " + localMap);
/* */
/* 420 */ boolean bool1 = Boolean.valueOf((String)localMap.get("commercial")).booleanValue();
/* 421 */ if ((jdField_a_of_type_Int == 1) && (bool1)) {
/* 422 */ jdField_a_of_type_Int = 3;
/* */ }
/* */
/* 425 */ localObject = (String)localMap.get("limited");
/* */
/* 427 */ if ((localObject != null) && (jdField_a_of_type_Int == 1)) {
/* 428 */ if (((String)localObject).equals("true")) {
/* 429 */ jdField_a_of_type_Int = 2;
/* 430 */ jn.a("License: evaluation");
/* */ }
/* 432 */ else if (((String)localObject).equals("scala")) {
/* 433 */ jdField_a_of_type_Int = 2;
/* 434 */ jdField_b_of_type_Int |= 1;
/* 435 */ jn.a("License: scala");
/* */ }
/* 437 */ else if (((String)localObject).equals("liverebel")) {
/* 438 */ jdField_a_of_type_Int = 2;
/* 439 */ jdField_b_of_type_Int |= 2;
/* 440 */ jn.a("License: liverebel");
/* */ }
/* */ }
/* 443 */ if (jdField_a_of_type_Int == 1) {
/* 444 */ localDate2 = (Date)localMap.get("validUntil");
/* 445 */ localDate3 = (Date)localMap.get("validFrom");
/* */ }
/* 447 */ else if (jdField_a_of_type_Int == 2) {
/* 448 */ localDate2 = (Date)localMap.get("limitedUntil");
/* 449 */ localDate3 = (Date)localMap.get("limitedFrom");
/* */ }
/* */
/* 452 */ if (c.contains(localMap.get("uid")))
/* 453 */ jdField_a_of_type_Int = 0;
/* */ }
/* */ catch (Exception localException1)
/* */ {
/* 457 */ iH.log("Exception checking the JRebel License");
/* 458 */ localException1.printStackTrace();
/* 459 */ iH.error(localException1);
/* */ }
/* */ }
/* */
/* 463 */ iH.echo();
/* 464 */ iH.echo("#############################################################");
/* 465 */ iH.echo();
/* 466 */ iH.echo(" JRebel " + str1 + " (" + ((jdField_a_of_type_JavaLangClass == null) ? (jS.jdField_a_of_type_JavaLangClass = a("com.zeroturnaround.javarebel.java4.Install")) : jdField_a_of_type_JavaLangClass).getPackage().getImplementationTitle() + ")");
/* 467 */ iH.echo(" (c) Copyright ZeroTurnaround, Ltd, 2007-2009. All rights reserved.");
/* 468 */ iH.echo();
/* */
/* 470 */ if (gA.c()) {
/* */ try {
/* 472 */ NumberFormat localNumberFormat = NumberFormat.getNumberInstance();
/* 473 */ localNumberFormat.setMinimumFractionDigits(0);
/* 474 */ localNumberFormat.setMaximumFractionDigits(1);
/* */
/* 476 */ String str3 = localNumberFormat.format(cU.a() * 96.0D / 3600.0D);
/* 477 */ localObject = localNumberFormat.format(cU.a() * 195.0D / 3600.0D);
/* */
/* 479 */ String str4 = localNumberFormat.format(cU.b() * 96.0D / 3600.0D);
/* 480 */ String str5 = localNumberFormat.format(cU.b() * 195.0D / 3600.0D);
/* */
/* 482 */ String str6 = "" + (cU.c() + 1);
/* 483 */ String str7 = "" + (cU.c() + 1);
/* */
/* 485 */ iH.echo(" A rough estimate: Over the last " + str6 + " days JRebel ");
/* 486 */ iH.echo(" prevented the need for at least " + cU.a() + " redeploys/restarts.");
/* 487 */ iH.echo(" Using industry standard build and redeploy times, ");
/* 488 */ iH.echo(" JRebel saved you between " + str3 + " and " + ((String)localObject) + " hours.");
/* */
/* 490 */ if (cU.c() > 60) {
/* 491 */ iH.echo(" Over the last " + str7 + " days JRebel saved you");
/* 492 */ iH.echo(" between " + str4 + " and " + str5 + " hours.");
/* */ }
/* */
/* 495 */ iH.echo();
/* */ }
/* */ catch (Exception localException2) {
/* 498 */ iH.error(localException2);
/* */ }
/* */ }
/* */
/* 502 */ if (jdField_a_of_type_Int == 3) {
/* 503 */ jdField_a_of_type_Boolean = true;
/* */
/* 505 */ str2 = (String)localMap.get("Seats");
/* */
/* 507 */ bool2 = ("1".equals(str2)) && (((localMap.get("Organization") == null) || ("".equals(localMap.get("Organization"))) || (((String)localMap.get("Organization")).equalsIgnoreCase("personal"))));
/* */
/* 511 */ localObject = new StringBuffer(" This product is licensed to ");
/* 512 */ if ((bool2) && (localMap.get("Name") != null) && (!("".equals(localMap.get("Name"))))) {
/* 513 */ ((StringBuffer)localObject).append(localMap.get("Name"));
/* */
/* 515 */ if ((localMap.get("Organization") != null) && (!("".equals(localMap.get("Organization"))))) {
/* 516 */ ((StringBuffer)localObject).append(" (");
/* 517 */ ((StringBuffer)localObject).append(localMap.get("Organization"));
/* 518 */ ((StringBuffer)localObject).append(") ");
/* */ }
/* 520 */ jn.a("License: personal");
/* */ }
/* */ else {
/* 523 */ ((StringBuffer)localObject).append(localMap.get("Organization"));
/* 524 */ jn.a("License: corporate");
/* */ }
/* */
/* 527 */ iH.echo(((StringBuffer)localObject).toString());
/* */
/* 529 */ if ("Unlimited".equals(str2)) {
/* 530 */ iH.echo(" for unlimited number of developer seats on site.");
/* */ }
/* 532 */ else if ((str2 != null) && (!(bool2))) {
/* 533 */ iH.echo(" for up to " + str2 + " developer seats on site. ");
/* */ }
/* 535 */ else if (bool2) {
/* 536 */ iH.echo(" for personal use only. ");
/* */ }
/* */
/* 539 */ if ((localMap.get("Comment") != null) && (!("".equals(localMap.get("Comment"))))) {
/* 540 */ iH.echo(" " + localMap.get("Comment"));
/* */ }
/* */
/* 543 */ if (localDate2 != null) {
/* 544 */ a(localDate1, localDate2);
/* */ }
/* */
/* 547 */ iH.echo();
/* 548 */ iH.echo("#############################################################");
/* 549 */ iH.echo();
/* */ }
/* 551 */ else if (jdField_a_of_type_Int == 2) {
/* 552 */ if (((jdField_b_of_type_Int & 0x2) == 0) && ((((localDate2 != null) && (localDate1.after(localDate2))) || ((localDate3 != null) && (localDate1.before(localDate3))))))
/* */ {
/* 555 */ iH.echo(" YOUR JREBEL LIMITED LICENSE HAS EXPIRED!");
/* */ }
/* */ else {
/* 558 */ jdField_a_of_type_Boolean = true;
/* */ }
/* */
/* 561 */ if ((jdField_b_of_type_Int & 0x2) == 0) {
/* 562 */ str2 = (String)localMap.get("Seats");
/* */
/* 564 */ bool2 = "1".equals(str2);
/* */
/* 566 */ localObject = new StringBuffer(" This product is licensed to ");
/* 567 */ if ((bool2) && (localMap.get("Name") != null) && (!("".equals(localMap.get("Name"))))) {
/* 568 */ ((StringBuffer)localObject).append(localMap.get("Name"));
/* */
/* 570 */ if ((localMap.get("Organization") != null) && (!("".equals(localMap.get("Organization"))))) {
/* 571 */ ((StringBuffer)localObject).append(" (");
/* 572 */ ((StringBuffer)localObject).append(localMap.get("Organization"));
/* 573 */ ((StringBuffer)localObject).append(") ");
/* */ }
/* */ }
/* */ else {
/* 577 */ ((StringBuffer)localObject).append(localMap.get("Organization"));
/* */ }
/* */
/* 580 */ iH.echo(((StringBuffer)localObject).toString());
/* */
/* 582 */ if (localDate2 != null) {
/* 583 */ iH.echo(" until " + SimpleDateFormat.getDateInstance(1, Locale.ENGLISH).format(localDate2));
/* */ }
/* */
/* 586 */ if ("Unlimited".equals(str2)) {
/* 587 */ iH.echo(" for unlimited number of developer seats on site.");
/* */ }
/* 589 */ else if ((str2 != null) && (!("1".equals(str2)))) {
/* 590 */ iH.echo(" for up to " + str2 + " developer seats on site. ");
/* */ }
/* */
/* 593 */ if ((localMap.get("Comment") != null) && (!("".equals(localMap.get("Comment"))))) {
/* 594 */ iH.echo(" With the following restrictions: ");
/* 595 */ iH.echo(" " + ((String)localMap.get("Comment")));
/* */ }
/* */
/* 598 */ if (localDate2 != null) {
/* 599 */ a(localDate1, localDate2);
/* */ }
/* */ }
/* */
/* 603 */ if (localMap.get("Organization") != null) {
/* 604 */ str2 = (String)localMap.get("Organization");
/* 605 */ if (str2.indexOf("[Open-Source]") != -1) {
/* 606 */ jn.a("Giveaway: OSS");
/* */ }
/* */
/* */ }
/* */
/* 613 */ iH.echo();
/* 614 */ iH.echo("#############################################################");
/* 615 */ iH.echo();
/* */ }
/* 617 */ else if (jdField_a_of_type_Int == 1) {
/* 618 */ if ((localDate2 == null) || (localDate1.after(localDate2))) {
/* 619 */ iH.echo(" YOUR JREBEL EVALUATION LICENSE HAS EXPIRED!");
/* */ }
/* 621 */ else if ((localDate3 == null) || (localDate1.before(localDate3))) {
/* 622 */ iH.echo(" YOUR JREBEL EVALUATION COULD NOT HAVE STARTED YET!");
/* */ }
/* */ else {
/* 625 */ jdField_a_of_type_Boolean = true;
/* */
/* 627 */ long l1 = localDate2.getTime() - localDate1.getTime();
/* 628 */ long l2 = l1 / 86400000L;
/* */
/* 630 */ iH.echo(" You are running JRebel evaluation license.");
/* 631 */ iH.echo(" You have " + (l2 + 1L) + " days until the license expires. ");
/* 632 */ iH.echo();
/* 633 */ iH.echo(" You will see this notification until you obtain a ");
/* 634 */ iH.echo(" full license for your installation. ");
/* */ }
/* 636 */ iH.echo(" ");
/* 637 */ iH.echo(" Visit www.jrebel.com for instructions on obtaining ");
/* 638 */ iH.echo(" a full license. If you wish to continue your evaluation ");
/* 639 */ iH.echo(" please e-mail to support@zeroturnaround.com. ");
/* 640 */ iH.echo(" ");
/* 641 */ iH.echo(" If you think you should not see this message contact ");
/* 642 */ iH.echo(" support@zeroturnaround.com or check that you have your ");
/* 643 */ iH.echo(" license file in the same directory as the JAR file. ");
/* 644 */ iH.echo(" ");
/* 645 */ iH.echo("#############################################################");
/* 646 */ iH.echo();
/* */
/* 649 */ eO.a(localUserLicense);
/* */ }
/* */ else {
/* 652 */ iH.echo(" YOU DO NOT HAVE A VALID JREBEL LICENSE! ");
/* 653 */ iH.echo(" ");
/* 654 */ iH.echo(" Visit www.jrebel.com for instructions on obtaining ");
/* 655 */ iH.echo(" a full or evaluation license. ");
/* 656 */ iH.echo(" ");
/* 657 */ iH.echo(" If you think you should not see this message contact ");
/* 658 */ iH.echo(" support@zeroturnaround.com or check that you have your ");
/* 659 */ iH.echo(" license file in the same directory as the JAR file. ");
/* 660 */ iH.echo(" ");
/* 661 */ iH.echo("#############################################################");
/* 662 */ iH.echo();
/* */ }
/* */
/* 665 */ if (!(jdField_a_of_type_Boolean)) {
/* 666 */ System.exit(1);
/* */ }