如何在android上支持jna <二>实战步骤 如何利用Capstone引擎写一个Android反汇编工具
java web\u5de5\u7a0bjna\u52a0\u8f7ddll\u9a71\u52a8\u95ee\u9898\u4f60\u597d
\u53ef\u4ee5\u901a\u8fc7System.out.println(System.getProperty("java.library.path"))
\u6765\u67e5\u770b\u5230\u5e95\u5e94\u8be5\u5728\u4ec0\u4e48\u5730\u65b9\u653e\u7f6eDLL\uff0c\u5728\u8fd9\u4e9b\u76ee\u5f55\u4e0b\u6709\u5c31\u53ef\u4ee5\u52a0\u8f7d
\u3000\u3000\u5728\u505a\u4e00\u4e9b\u9006\u5411\u5de5\u7a0b\u65f6\uff0c\u5076\u7136\u60f3\u5230\u6211\u8fd8\u6ca1\u6709\u4e00\u6b3e\u7528\u4e8e\u5b89\u5353\u53cd\u6c47\u7f16\u4e8c\u8fdb\u5236\u6587\u4ef6\u7684\u5de5\u5177\u3002\u4e4b\u540e\u505a\u4e86\u4e00\u4e9b\u7814\u7a76\uff0c\u6211\u5c06\u76ee\u6807\u9009\u5b9a\u4e3aCapstone Engine\uff0c\u4e0b\u9762\u5c31\u5c06\u4ecb\u7ecd\u6211\u662f\u5982\u4f55\u96c6\u6210Capstone Engine\u5728\u5b89\u5353\u8bbe\u5907\u4e0a\u8fd0\u884c\u7684\u3002
\u521b\u5efaAndroid\u9879\u76ee
\u4e3a\u6b64\uff0c\u6211\u8fd8\u7279\u610f\u4f7f\u7528\u4e86Android Studio\u3002\u521b\u5efa\u4e00\u4e2a\u7a7a\u767d\u7684\u9879\u76ee \u2013 \u8fd9\u91cc\u6ca1\u5565\u7279\u522b\u7684\uff0c\u4f46\u662f\u9700\u8981\u6ce8\u610f\u7684\u662f\u6211\u5728app/src/main/\u4e0b\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3ajniLibs\u7684\u76ee\u5f55\uff0c\u5176\u4e2d\u5305\u542b\u4e86\u6211\u4eec\u4e4b\u540e\u4f1a\u7528\u5230\u7684\u7f16\u8bd1\u597d\u7684C\u51fd\u6570\u5e93\u3002
\u8bf7\u6ce8\u610f\uff0c\u6211\u901a\u8fc7Android Studio SDK Manager\u5b89\u88c5\u4e86NDK
\u7f16\u8bd1Capstone Engine
\u63a5\u4e0b\u6765\u4e3aAndroid\u4ea4\u53c9\u7f16\u8bd1Capstone Engine
\u3000\u3000# git clone https://github.com/aquynh/capstone.git
Cloning into 'capstone'...
remote: Counting objects: 16805, done.
remote: Compressing objects: 100% (12/12), done.
remote: Total 16805 (delta 4), reused 0 (delta 0), pack-reused 16789
Receiving objects: 100% (16805/16805), 26.10 MiB | 3.01 MiB/s, done.
Resolving deltas: 100% (12089/12089), done.Checking connectivity... done.
# cd capstone
# NDK=~/Library/Android/sdk/ndk-bundle/ ./make.sh cross-android arm
\u5728\u5f53\u524d\u76ee\u5f55\u4e2d\u6211\u4eec\u5e94\u8be5\u6709\u4e00\u4e2a\u540d\u4e3alibcapstone.so\u7684\u6587\u4ef6\uff0c\u5c06\u5176\u590d\u5236\u5230\u6211\u4eec\u4e4b\u524d\u521b\u5efa\u7684jniLibs\u76ee\u5f55\u4e2d\u3002
\u63a5\u7740\u4e0b\u8f7d\u4e00\u4efdCapstone Java bindings\uff0c\u5e76\u5c06\u5176\u653e\u5165Android Studio\u9879\u76ee\u4e2d\u7684app/libs/\u76ee\u5f55\uff0c\u5176\u63d0\u4f9b\u4e86\u4e00\u4e9b\u65b9\u6cd5\u548c\u7c7b\u5e2e\u52a9\u6211\u4eec\u4e0eCapstone Engine\u8fdb\u884c\u4ea4\u4e92\u3002
\u7f16\u8bd1JNA
Capstone Java bindings\u5229\u7528JNA\u51fd\u6570\u5e93\u52a0\u8f7d\u5e76\u4e0eCapstone\u9884\u5236\u51fd\u6570\u5e93\u6c9f\u901a\uff0c\u6211\u4eec\u9700\u8981\u4e3aAndroid\u7f16\u8bd1JNA JAR\u5e76\u63d0\u53d6\u652f\u6301JNA\u7684\u4e8c\u8fdb\u5236\u5e93\u5e73\u53f0\u3002
\u8fd9\u4e00\u6b65\uff0c\u4f60\u9700\u8981\u5b89\u88c5ant\uff1a
\u3000\u3000# git clone https://github.com/twall/jna.git
Cloning into 'jna'...
remote: Counting objects: 41416, done.
remote: Total 41416 (delta 0), reused 0 (delta 0), pack-reused 41416
Receiving objects: 100% (41416/41416), 213.06 MiB | 4.51 MiB/s, done.
Resolving deltas: 100% (26780/26780), done.Checking connectivity... done.
# cd jna
# PATH=$PATH:~/Library/Android/sdk/ NDK_PLATFORM=~/Library/Android/sdk/ndk-bundle/platforms/android-21/ ant -Dos.prefix=android-arm dist
JNA\u5b8c\u6210\u7f16\u8bd1\u4e4b\u540e\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u590d\u5236\u4e00\u4e9b\u6587\u4ef6\u5230Android Studio project\u3002\u9996\u5148\u590d\u5236dist/jna.jar\u5230\u9879\u76ee\u4e0b\u7684app/libs/\u76ee\u5f55\uff0c\u7136\u540e\u5c31\u50cf\u89e3\u538bzip\u6587\u4ef6\u5305\u4e00\u6837\u63d0\u53d6dist/android-arm.jar\u6587\u4ef6\uff0c\u5c06libjnidispatch.so\u6587\u4ef6\u590d\u5236\u5230\u9879\u76ee\u4e0b\u7684app/src/main/jniLibs\u76ee\u5f55\u3002JNA\u4f7f\u7528\u7684\u8fd9\u4e9b\u51fd\u6570\u5e93\u901a\u8fc7JNI\u4e0e\u672c\u673a\u51fd\u6570\u5e93\u8fdb\u884c\u4ea4\u4e92\u3002
\u5728\u4e00\u8d77\uff0c\u5728\u4e00\u8d77\uff01
\u65e2\u7136\u5df2\u7ecf\u5c06\u6240\u6709\u7684\u51fd\u6570\u5e93\u90fd\u8fdb\u884c\u4e86\u7f16\u8bd1\uff0c\u5e76\u5c06\u8fd9\u4e9b\u6587\u4ef6\u590d\u5236\u5230\u9879\u76ee\u4e0b\u76f8\u5bf9\u5e94\u7684\u76ee\u5f55\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u5f00\u59cb\u4f7f\u7528Capstone Engine\u3002\u5728\u6211\u4eec\u5f00\u59cb\u4f7f\u7528\u4e4b\u524d\uff0c\u6211\u4eec\u9700\u8981\u4fdd\u8bc1\u590d\u5236\u5230\u9879\u76ee\u4e0b\u7684\u4e24\u4e2aJava\u5e93\u5df2\u7ecf\u88ab\u5305\u542b\u3002\u8981\u505a\u5230\u8fd9\u4e00\u70b9\uff0c\u5728Android Studio\u4e2d\u5c06\u4ed6\u4eec\u4f5c\u4e3a\u6587\u4ef6\u7684\u4f9d\u8d56\u8fdb\u884c\u589e\u52a0(\u53f3\u952e\u5355\u51fb\u6a21\u5757\uff0c\u6253\u5f00\u6a21\u5757\u8bbe\u7f6e\uff0c\u7136\u540e\u6253\u5f00\u4f9d\u8d56\u5173\u7cfb\u9009\u9879\u5361\uff0c\u6700\u540e\u70b9\u51fb'+'\u6309\u94ae\u8fdb\u884c\u6dfb\u52a0)
\u6dfb\u52a0\u5b8c\u6210\u4e4b\u540e\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u5728Android\u9879\u76ee\u4e2d\u4f7f\u7528Capstone\u4e86\uff1a
\u3000\u3000import capstone.Capstone;public class MainActivity extends Activity {
private byte [] CODE = { 0x55, 0x48, (byte) 0x8b, 0x05, (byte) 0xb8, 0x13, 0x00, 0x00 };
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Capstone cs = new Capstone(Capstone.CS_ARCH_X86, Capstone.CS_MODE_64);
Capstone.CsInsn[] allInsn = cs.disasm(CODE, 0x1000);
for (int i=0; i<allinsn.length; i++)="" { Log.e("CAPSTONE", allInsn[i].address + " " + allInsn[i].mnemonic + " " + allInsn[i].opStr);
}
}}
lib(libjnidispatch.so），现在支持的平台有win32 x86/amd64/mac, linux x86/bsd, sun os
等等，java层应该是通用，无需做改动。所以文章就做在怎样得到android平台辨认的native .so 上。
2） 确定思路，搭建jna/native arm交叉编译环境，得到android自己的jna.jar.
3） 源码下载，开源项目非常方便
$ svn co https //jna dev java net/svn/jna/trunk/jnalib
4) 选择编译器，考虑到jna是gnu项目，而且所有eabi编译器都兼容，所以选择arm-linux-none-gnueabi-gcc.
5) 进入源码树，
$ cd jnalib
6) 设置环境变量。java, gcc, ant等。
$ export
PATH=/opt/ant/bin:/opt/jdk1.6.0_11/bin:/opt/arm-none-linux-gnueabi/bin:/opt/android-ndk-r4/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin:$PATH
$ export JAVA_HOME=/usr/java/jdk1.6.0_21/
7) 更改build.xml,native/makefile来支持arm平台。（比较长，可略过不看）
ndex:
native/Makefile
===================================================================
---
native/Makefile (revision 1146)
+++ native/Makefile (working
copy)
@@ -54,8 +54,8
@@
LIBSFX=.so
ARSFX=.a
JNISFX=$(LIBSFX)
-CC=gcc
-LD=gcc
+CC=arm-none-linux-gnueabi-gcc
+LD=arm-none-linux-gnueabi-gcc
LIBS=
#
Default to Sun recommendations for JNI compilation
COPT=-O2
-fno-omit-frame-pointer -fno-strict-aliasing
@@ -126,10 +126,12
@@
endif
ifeq ($(OS),linux)
-ARCH=$(shell uname -m | sed
's/i.86/i386/g')
+ARCH=arm #$(shell uname -m | sed
's/i.86/i386/g')
PCFLAGS+=-fPIC
CDEFINES+=-DHAVE_PROTECTION
LDFLAGS+=-Wl,-soname,$@
+FFI_CONFIG
+=
--host=arm-none-linux-gnueabi
+CINCLUDES+=-I/usr/include
endif
ifeq
($(OS),freebsd)
Index:
build.xml
===================================================================
---
build.xml (revision 1146)
+++ build.xml (working copy)
@@ -92,6
+92,7 @@
<os arch="ppc64"/>
<os
arch="sparcv9"/>
<os arch="amd64"/>
+ <os
arch="arm"/>
</or>
</condition>
<condition property="ld.preload" value="LD_PRELOAD_64"
else="LD_PRELOAD">
@@ -110,6 +111,9 @@
<condition
property="jre.arch" value="i386">
<equals arg1="x86"
arg2="${os.arch}"/>
</condition>
+ <condition
property="jre.arch" value="arm">
+ <equals arg1="arm"
arg2="${os.arch}"/>
+ </condition>
<condition
property="jre.arch" value="amd64">
<equals arg1="x86_64"
arg2="${os.arch}"/>
</condition>
@@ -285,6 +289,7 @@
<copy file="${dist}/out-of-date.jar" tofile="${dist}/win32-x86.jar"
overwrite="true"/>
<copy file="${dist}/out-of-date.jar"
tofile="${dist}/win32-amd64.jar" overwrite="true"/>
<copy
file="${dist}/out-of-date.jar" tofile="${dist}/linux-i386.jar"
overwrite="true"/>
+ <copy file="${dist}/out-of-date.jar"
tofile="${dist}/android.jar" overwrite="true"/>
<copy
file="${dist}/out-of-date.jar" tofile="${dist}/linux-amd64.jar"
overwrite="true"/>
<copy file="${dist}/out-of-date.jar"
tofile="${dist}/linux-ia64.jar" overwrite="true"/>
<copy
file="${dist}/out-of-date.jar" tofile="${dist}/freebsd-i386.jar"
overwrite="true"/>
@@ -598,6 +603,9 @@
<zipfileset
src="${dist}/linux-i386.jar"
includes="*jnidispatch*"
prefix="com/sun/jna/linux-i386"/>
+ <zipfileset
src="${dist}/arm-none-linux.jar"
+
includes="*jnidispatch*"
+
prefix="com/sun/jna/android"/>
<zipfileset
src="${dist}/linux-amd64.jar"
includes="*jnidispatch*"
prefix="com/sun/jna/linux-amd64"/>
8） 编译
$ ant -Djre.arch=arm -Dos.arch=arm -Dos.prefix=linux-arm
9)编译完成，你就可以在build下等到arm编译器编出来的jna.jar了， 如果你用eclipse，就可以直接Project...->add
Jar 使用它了。有可能（还不确定）， android不支持在jar包中加本地native .so 的做法，你可以将jna.jar分拆开将java
class还以Jar的方式加载，而把linux-arm/下的libjnidispatch.so以add Lib..的方法加入，你可以尝试一下。
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