Exploring the database

We’re currently trying to integrate sdb into radare2. This will greatly reduce code complexity, improve portability, and open the way to collaborative reversing.

What is sdb ?

sdb is a simple string key/value database based on djb’s cdb disk storage and supports JSON and arrays introspection.

There’s also the sdbtypes: a vala library that implements several data structures on top of an sdb or a memcache instance.

It has:

• namespaces (multiple sdb paths)
• atomic database sync (never corrupted)
• bindings for vala, luvit, newlisp and nodejs
• commandline frontend for sdb databases
• memcache client and server with sdb backend
• arrays support (syntax sugar)
• json parser/getter

Usage example

Let’s create a database!

$ sdb d hello=world
$ sdb d hello
world

Using arrays:

$ sdb - '[]list=1,2' '[0]list' '[0]list=foo' '[]list' '[+1]list=bar'
1
foo
2
foo
fuck
2

Let’s play with json:

$ sdb d g='{"foo":1,"bar":{"cow":3}}'
$ sdb d g?bar.cow
3
$ sdb - user='{"id":123}' user?id=99 user?id
99

Using the command line without any disk database:

$ sdb - foo=bar foo a=3 +a -a
bar
4
3

$ sdb -
foo=bar
foo
bar
a=3
+a
4
-a
3

Remove the database

$ rm -f d

So what ?

So, you can now do this inside your radare2 sessions!

Let’s take a simple binary, and check what is already sdbized.

$ cat test.c
int main(){
	puts("Hello world\n");
}
$ gcc test.c -o test

$ r2 -A ./test
[0x08048320]> k **
bin
anal
syscall
debug

[0x08048320]> k bin/**
fd.6
[0x08048320]> k bin/fd.6/*
archs=0:0:x86:32

The file corresponding to the sixth file descriptor is a x86_32 binary.

[0x08048320]> k anal/meta/*
meta.s.0x80484d0=12,SGVsbG8gd29ybGQ=
[...]
[0x08048320]> ?b64- SGVsbG8gd29ybGQ=
Hello world

Strings are stored encoded in base64.

Conclusion

Feel free to explore, modify, play, save, replay and trash the database.

Also, if you want to help to integrate sdb more tightly, go check the related issues.