連接

本地process()、遠程remote()。對於remote函數可以接url並且指定端口。

IO模塊

下面給出了PwnTools中的主要IO函數。這個比較容易跟zio搞混，記住zio是read、write，pwn是recv、send就可以了。

send(data) : 發送數據
sendline(data) : 發送一行數據，相當於在末尾加\n

recv(numb=4096, timeout=default) : 給出接收字節數,timeout指定超時
recvuntil(delims, drop=False) : 接收到delims的pattern
（以下可以看作until的特例）
recvline(keepends=True) : 接收到\n，keepends指定保留\n
recvall() : 接收到EOF
recvrepeat(timeout=default) : 接收到EOF或timeout

interactive() : 與shell交互

ELF模塊

ELF模塊用於獲取ELF文件的信息，首先使用ELF()獲取這個文件的句柄，然後使用這個句柄調用函數，和IO模塊很相似。

下面演示了：獲取基地址、獲取函數地址（基於符號）、獲取函數got地址、獲取函數plt地址

>>> e = ELF(‘/bin/cat‘)
>>> print hex(e.address)  # 文件裝載的基地址
0x400000
>>> print hex(e.symbols[‘write‘]) # 函數地址
0x401680
>>> print hex(e.got[‘write‘]) # GOT表的地址
0x60b070
>>> print hex(e.plt[‘write‘]) # PLT的地址
0x401680

數據處理

主要是對整數進行打包，就是轉換成二進制的形式，比如轉換成地址。p32、p64是打包，u32、u64是解包。

DynELF

DynELF是leak信息的神器。前提條件是要提供一個輸入地址，輸出此地址最少1byte數的函數。官網給出的說明是：Given a function which can leak data at an arbitrary address, any symbol in any loaded library can be resolved.

很叼啊，有木有。以下是官方例程

# Assume a process or remote connection
p = process(‘./pwnme‘)

# Declare a function that takes a single address, and
# leaks at least one byte at that address.
def leak(address):
    data = p.read(address, 4)
    log.debug("%#x => %s" % (address, (data or ‘‘).encode(‘hex‘)))
    return data

# For the sake of this example, let‘s say that we
# have any of these pointers.  One is a pointer into
# the target binary, the other two are pointers into libc
main   = 0xfeedf4ce
libc   = 0xdeadb000
system = 0xdeadbeef

# With our leaker, and a pointer into our target binary,
# we can resolve the address of anything.
#
# We do not actually need to have a copy of the target
# binary for this to work.
d = DynELF(leak, main)
assert d.lookup(None,     ‘libc‘) == libc
assert d.lookup(‘system‘, ‘libc‘) == system

# However, if we *do* have a copy of the target binary,
# we can speed up some of the steps.
d = DynELF(leak, main, elf=ELF(‘./pwnme‘))
assert d.lookup(None,     ‘libc‘) == libc
assert d.lookup(‘system‘, ‘libc‘) == system

# Alternately, we can resolve symbols inside another library,
# given a pointer into it.
d = DynELF(leak, libc + 0x1234)
assert d.lookup(‘system‘)      == system

pwntools使用簡介3