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Dongho Kim
2024-11-10 19:22:02 +09:00
parent ca0fd21d73
commit be44ad3718
2 changed files with 4 additions and 4 deletions
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5
week02/easy/client.py
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@ -14,8 +14,8 @@ from random import randrange
log = logging.getLogger(__name__)
TCP_CLIENTS = {} # ((IP, port) -> [sent_packets])
SERVER_IP = '131.159.15.68' # don't use the domain name in this case
# SERVER_IP = '192.168.1.4' # don't use the domain name in this case
# SERVER_IP = '131.159.15.68' # don't use the domain name in this case
SERVER_IP = '192.168.1.4' # don't use the domain name in this case
SERVER_PORT = 20102
COOKIE_SECRET = 'TASTY_COOKIES123'
INITIAL_SEQ = 1337
@ -38,6 +38,7 @@ def handle_packet(packet: Packet):
print("received acknowledgement")
payload = bytes(packet[TCP].payload).decode(errors='ignore')
print("Extracted flag:", payload) # This should print "hello world"
exit()
# Function to start the packet sniffing

3
week02/easy/server.py
View File

@ -73,14 +73,13 @@ def handle_packet(packet: Packet):
send(initial_syn)
else:
print("i am in this state")
if (0x02 in packet[TCP].flags) or (not seq == expected_cookie) or (not ack == INITIAL_SEQ):
print(f'Invalid cookie {seq}, expected {expected_cookie}')
rst = get_rst(src_ip, src_port, seq)
send(rst)
else:
print(f'Cookie {expected_cookie} and packet is again correct')
flag = "hello world"
ip = IP(dst=src_ip)
syn_ack = TCP(