Rating:
# Coinslot
```python
#!/usr/bin/env python
from pwn import *
r = remote('misc.chal.csaw.io', '8000')
def process():
value = float(r.recvline()[1:])
bills = [10000, 5000, 1000, 500, 100, 50, 20, 10, 5, 1, 0.50, 0.25, 0.10, 0.05, 0.01]
counter = dict.fromkeys(bills, 0)
print('input: ' + str(value))
for bill in bills:
# the second condition is because we are using float
while value - bill > 0 or abs(value - bill) < 0.005:
counter[bill] += 1
value -= bill
r.recvuntil(': ')
r.sendline(str(counter[bill]))
return r.recvline()
while True:
print process()
```
```
$ python ./coinbase.py DEBUG
[ .. SNIP .. ]
[DEBUG] Sent 0x2 bytes:
'1\n'
[DEBUG] Received 0xe bytes:
'nickels (5c): '
[DEBUG] Sent 0x2 bytes:
'0\n'
[DEBUG] Received 0xe bytes:
'pennies (1c): '
[DEBUG] Sent 0x2 bytes:
'2\n'
[DEBUG] Received 0x47 bytes:
'correct!\n'
'flag{started-from-the-bottom-now-my-whole-team-fucking-here}\n'
'\n'
correct!
Traceback (most recent call last):
File "./coinbase.py", line 26, in <module>
print process()
File "./coinbase.py", line 8, in process
value = float(r.recvline()[1:])
ValueError: could not convert string to float: lag{started-from-the-bottom-now-my-whole-team-fucking-here}
[*] Closed connection to misc.chal.csaw.io port 8000
```
