由于工作需要，研究了一下如何從Android so中提取URL。Android so實際上是一個ELF(Executable and Linking Format)格式的文件，要從中提取URL就需要首先了解ELF文件格式。URL實際上就是一個字符串，要從Android so中提取URL，實際上我們只需知道ELF文件的字符串存儲在哪個區段就可以了。以下為ELF文件區塊表的介紹：

.text	where code stands, as said above. objdump -drS .process.o will show you that
.data	where global tables, variables, etc. stand. objdump -s -j .data .process.o will hexdump it.
.bss	don't look for bits of .bss in your file: there's none. That's where your uninitialized arrays and variable are, and the loader 'knows' they should be filled with zeroes ... there's no point storing more zeroes on your disk than there already are, is it?
.rodata	that's where your strings go, usually the things you forgot when linking and that cause your kernel not to work. objdump -s -j .rodata .process.o will hexdump it. Note that depending on the compiler, you may have more sections like this.
.comment & .note	just comments put there by the compiler/linker toolchain
.stab & .stabstr	debugging symbols & similar information.

　　注：要想了解詳細的ELF文件格式見http://wiki.osdev.org/ELF。此文只介紹與主題相關的知識。

從表中的粗體字可以知道.rodata區段便是ELF文件字符串的存儲位置，使用objdump -s -j .rodata filename命令可以獲取所有字符串信息，然后就可以提取URL了。

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