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- import argparse
- import math
- import os
- import socket
-
- IP_ADDR = "0.0.0.0"
- MSS = 24000 # MSS = Server buffer size (20480) - data header size (4)
-
-
- def await_ack(packet, addr):
- s.settimeout(1)
- while True:
- try:
- data, addr = s.recvfrom(MSS)
- return (data, addr)
- except KeyboardInterrupt:
- print("Server: Exiting...")
- exit()
- except socket.timeout:
- print("Server: Retransmitting...")
- s.sendto(packet, addr)
-
-
- if __name__ == "__main__":
- parser = argparse.ArgumentParser()
- parser.add_argument("port", type=str)
- args = parser.parse_args()
-
- server_port = args.port
- server_port = int(server_port)
-
- with socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM) as s:
- s.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, 30000)
- s.bind((IP_ADDR, server_port))
- print(f'Listening on {IP_ADDR}:{server_port}...')
-
- data, addr = s.recvfrom(MSS)
- columns = data.decode('utf-8', 'replace').split('|')
- print(columns)
- if os.path.isfile(f'./{columns[2]}'):
- print(f'file {columns[2]} exists. Overwriting...')
- f = open(columns[2], 'wb')
-
- if columns[0] == 's':
- message = f'a|{(int(columns[1])+1)%2}'
- s.sendto(message.encode(), addr)
- data, addr = await_ack(message.encode(), addr)
-
- bytes_received = 0
- last = b'0'
- while bytes_received < int(columns[3]):
- new_columns = data.split(b'|')
- if new_columns[0] != b'd':
- data, addr = await_ack(message.encode(), addr)
- continue
- if new_columns[1] == last:
- data, addr = await_ack(message.encode(), addr)
- continue
-
- last = new_columns[1]
-
- bindata = new_columns[2]
- for i in new_columns[3:]:
- bindata = bindata + (b'|') + i
- f.write(bindata)
- bytes_received += len(bindata)
- print(f'Received: {bytes_received}/{columns[3]}')
-
- message = f'a|{(int(new_columns[1])+1)%2}'
- s.sendto(message.encode(), addr)
- data, addr = await_ack(message.encode(), addr)
-
- print(f'file {columns[2]} was successfully uploaded. Exiting...')
- else:
- exit(1)
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