删除apk/dex里的support类的shell脚本

Posted on Edited on In

以前全局搜字符串时候经常搜到support-v4/7/13的字符串，逆向时候烦的不行，写了一个轮子，专门删除dex里面的这部分代码。

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if [ "$#" -ne 1 -a "$#" -ne 2 ];then
	echo "Delete support-v4/v7/v13 classes in dex or apk.
Usage:
    ./del-support.sh input-dex/apk [output-dex/apk]
Sample:
    ./del-support.sh classes.dex out.dex
    ./del-support.sh input.apk output.apk
Author: LeadroyaL
Time: 2018/3/5"
	exit
fi

echo "GOGOGO!"

if [[ $1 == *.dex ]];then
	echo "dex file!"
	t=dex
	filename=${1%%.dex}
fi
if [[ $1 == *.apk ]];then
	echo "apk file!"
	t=apk
	filename=${1%%.apk}
fi
echo type is $t and filename is $filename
if [[ $t == apk ]];then
	unzip $1 classes.dex
fi

java -jar baksmali.jar d $1
rm -rf out/android/support/
java -jar smali.jar a out/

if [ "$#" -eq 1 ];then
	if [[ $t == apk ]];then
		o="output.apk"
	else
		o="out.dex"
	fi
else
	o=$2
fi

if [[ $t == apk ]];then
	if [[ $o != *.apk ]];then
		o=$o.apk
	else
		o=$o
	fi
	mv out.dex classes.dex
	cp $1 $o
	zip $o -u classes.dex
else
	mv out.dex $o
fi

echo Success and $o generated.

第一次写shell脚本，坑的要死，记一下几个坑：

  • [] 和 [[]] 是不一样的，正则匹配字符串时候千万不能写[ $1 == *.dex ] ，要写[[ $1 == *.dex ]] ，前者*.dex的意义是补全当前目录下的所有.dex文件
  • ${xxxx}可以进行字符串的拼接删除操作

效果：

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➜  /tmp ./del-support.sh app-debug.apk
GOGOGO!
apk file!
type is apk and filename is app-debug
Archive:  app-debug.apk
replace classes.dex? [y]es, [n]o, [A]ll, [N]one, [r]ename: y
  inflating: classes.dex
updating: classes.dex (deflated 69%)
Success and output.apk generated.
➜  /tmp ./del-support.sh classes.dex
GOGOGO!
dex file!
type is dex and filename is classes
Success and out.dex generated.