new ep

139/notes.yml

@@ -0,0 +1,8 @@
+reasons:
+    - it disrespects open source licenses and may expose you to liability
+    - it may turn into a crutch that you'll depend heavily on and may have to pay for
+    - your private code is transmitted to github
+    - it can and will produce bad and/or unsafe code
+
+sources:
+    - https://copilot.github.com/

140/commands.txt

@@ -1,15 +1,15 @@
-replace ip addresses as appropriate
+# replace ip addresses as appropriate
 
-run on machine 1
-echo 'punch hole' | nc -u -p 50001 143.198.238.218 50002
+run on machine 1 (147.182.184.196)
+echo 'punch hole' | nc -u -p 50001 143.198.173.180 50002
 nc -u -l 50001
 
-run on machine 2
-echo 'punch hole' | nc -u -p 50001 143.198.185.20 50002
+run on machine 2 (143.198.173.180)
+echo 'punch hole' | nc -u -p 50001 147.182.184.196 50002
 nc -u -l 50001
 
-run on machine 1
-echo 'hello' | nc -u -p 50002 143.198.238.218 50001
+run on machine 1 (147.182.184.196)
+echo 'hello' | nc -u -p 50002 143.198.173.180 50001
 
-run on machine 2
-echo 'hello' | nc -u -p 50002 143.198.185.20 50001
+run on machine 2 (143.198.173.180)
+echo 'hello' | nc -u -p 50002 147.182.184.196 50001

141/client.py

@@ -0,0 +1,61 @@
+import socket
+import sys
+import threading
+
+rendezvous = ('147.182.184.215', 55555)
+
+# connect to rendezvous
+print('connecting to rendezvous server')
+
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+sock.bind(('0.0.0.0', 50001))
+sock.sendto(b'0', rendezvous)
+
+while True:
+    data = sock.recv(1024).decode()
+
+    if data.strip() == 'ready':
+        print('checked in with server, waiting')
+        break
+
+data = sock.recv(1024).decode()
+ip, sport, dport = data.split(' ')
+sport = int(sport)
+dport = int(dport)
+
+print('\ngot peer')
+print('  ip:          {}'.format(ip))
+print('  source port: {}'.format(sport))
+print('  dest port:   {}\n'.format(dport))
+
+# punch hole
+# equiv: echo 'punch hole' | nc -u -p 50001 x.x.x.x 50002
+print('punching hole')
+
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+sock.bind(('0.0.0.0', sport))
+sock.sendto(b'0', (ip, dport))
+
+print('ready to exchange messages\n')
+
+# listen for
+# equiv: nc -u -l 50001
+def listen():
+    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    sock.bind(('0.0.0.0', sport))
+
+    while True:
+        data = sock.recv(1024)
+        print('\rpeer: {}\n> '.format(data.decode()), end='')
+
+listener = threading.Thread(target=listen, daemon=True);
+listener.start()
+
+# send messages
+# equiv: echo 'xxx' | nc -u -p 50002 x.x.x.x 50001
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+sock.bind(('0.0.0.0', dport))
+
+while True:
+    msg = input('> ')
+    sock.sendto(msg.encode(), (ip, sport))

141/server.py

@@ -0,0 +1,29 @@
+import socket
+
+known_port = 50002
+
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+sock.bind(('0.0.0.0', 55555))
+
+while True:
+    clients = []
+
+    while True:
+        data, address = sock.recvfrom(128)
+
+        print('connection from: {}'.format(address))
+        clients.append(address)
+
+        sock.sendto(b'ready', address)
+
+        if len(clients) == 2:
+            print('got 2 clients, sending details to each')
+            break
+
+    c1 = clients.pop()
+    c1_addr, c1_port = c1
+    c2 = clients.pop()
+    c2_addr, c2_port = c2
+
+    sock.sendto('{} {} {}'.format(c1_addr, c1_port, known_port).encode(), c2)
+    sock.sendto('{} {} {}'.format(c2_addr, c2_port, known_port).encode(), c1)