47 lines
1.5 KiB
Python
47 lines
1.5 KiB
Python
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"""
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Network related stuff
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"""
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import socket
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from smtp_test_server.exceptions import NotALocalHostnameOrIPAddressToBindToError
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def is_bind_host_is_local(bind_host: str) -> bool:
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"""
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Find out if the given name is local
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:param bind_host: The host to bind to (ip or hostname)
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:return: True, if the host to bind is local, False otherwise
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"""
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if bind_host in ("localhost", "127.0.0.1", "0.0.0.0", "::1", "::0", "0:0:0:0:0:0:0:1", "0:0:0:0:0:0:0:0"):
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return True
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local_host_name = socket.gethostname()
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local_addresses = socket.getaddrinfo(local_host_name, 1)
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try:
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remote_addresses = socket.getaddrinfo(bind_host, 1)
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except OSError:
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return False
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for _, _, _, _, local_socket_address in local_addresses:
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for _, _, _, _, remote_socket_address in remote_addresses:
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if remote_socket_address[0] == local_socket_address[0]:
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return True
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return False
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def find_free_port(bind_host: str) -> int:
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"""
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Find a free port on the bind host
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:param bind_host: Host to try the bind
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:return: A free port number
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:raises OSError: When no port could be allocated
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"""
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with socket.socket() as sock:
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if not is_bind_host_is_local(bind_host):
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raise NotALocalHostnameOrIPAddressToBindToError(
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-1, f"'{bind_host}' is not a local host name / ip address to bind to"
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)
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sock.bind((bind_host, 0))
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return sock.getsockname()[1]
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