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"""
This module contains tests that use invalid content lengths, and validates that
they fail appropriately.
"""
from __future__ import annotations
import pytest
import h2.config
import h2.connection
import h2.errors
import h2.events
import h2.exceptions
class TestInvalidContentLengths:
"""
Hyper-h2 raises Protocol Errors when the content-length sent by a remote
peer is not valid.
"""
example_request_headers = [
(":authority", "example.com"),
(":path", "/"),
(":scheme", "https"),
(":method", "POST"),
("content-length", "15"),
]
example_request_headers_bytes = [
(b":authority", b"example.com"),
(b":path", b"/"),
(b":scheme", b"https"),
(b":method", b"POST"),
(b"content-length", b"15"),
]
example_response_headers = [
(":status", "200"),
("server", "fake-serv/0.1.0"),
]
server_config = h2.config.H2Configuration(client_side=False)
@pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes])
def test_too_much_data(self, frame_factory, request_headers) -> None:
"""
Remote peers sending data in excess of content-length causes Protocol
Errors.
"""
c = h2.connection.H2Connection(config=self.server_config)
c.initiate_connection()
c.receive_data(frame_factory.preamble())
headers = frame_factory.build_headers_frame(
headers=request_headers,
)
first_data = frame_factory.build_data_frame(data=b"\x01"*15)
c.receive_data(headers.serialize() + first_data.serialize())
c.clear_outbound_data_buffer()
second_data = frame_factory.build_data_frame(data=b"\x01")
with pytest.raises(h2.exceptions.InvalidBodyLengthError) as exp:
c.receive_data(second_data.serialize())
assert exp.value.expected_length == 15
assert exp.value.actual_length == 16
assert str(exp.value) == (
"InvalidBodyLengthError: Expected 15 bytes, received 16"
)
expected_frame = frame_factory.build_goaway_frame(
last_stream_id=1,
error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR,
)
assert c.data_to_send() == expected_frame.serialize()
@pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes])
def test_insufficient_data(self, frame_factory, request_headers) -> None:
"""
Remote peers sending less data than content-length causes Protocol
Errors.
"""
c = h2.connection.H2Connection(config=self.server_config)
c.initiate_connection()
c.receive_data(frame_factory.preamble())
headers = frame_factory.build_headers_frame(
headers=request_headers,
)
first_data = frame_factory.build_data_frame(data=b"\x01"*13)
c.receive_data(headers.serialize() + first_data.serialize())
c.clear_outbound_data_buffer()
second_data = frame_factory.build_data_frame(
data=b"\x01",
flags=["END_STREAM"],
)
with pytest.raises(h2.exceptions.InvalidBodyLengthError) as exp:
c.receive_data(second_data.serialize())
assert exp.value.expected_length == 15
assert exp.value.actual_length == 14
assert str(exp.value) == (
"InvalidBodyLengthError: Expected 15 bytes, received 14"
)
expected_frame = frame_factory.build_goaway_frame(
last_stream_id=1,
error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR,
)
assert c.data_to_send() == expected_frame.serialize()
@pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes])
def test_insufficient_data_empty_frame(self, frame_factory, request_headers) -> None:
"""
Remote peers sending less data than content-length where the last data
frame is empty causes Protocol Errors.
"""
c = h2.connection.H2Connection(config=self.server_config)
c.initiate_connection()
c.receive_data(frame_factory.preamble())
headers = frame_factory.build_headers_frame(
headers=request_headers,
)
first_data = frame_factory.build_data_frame(data=b"\x01"*14)
c.receive_data(headers.serialize() + first_data.serialize())
c.clear_outbound_data_buffer()
second_data = frame_factory.build_data_frame(
data=b"",
flags=["END_STREAM"],
)
with pytest.raises(h2.exceptions.InvalidBodyLengthError) as exp:
c.receive_data(second_data.serialize())
assert exp.value.expected_length == 15
assert exp.value.actual_length == 14
assert str(exp.value) == (
"InvalidBodyLengthError: Expected 15 bytes, received 14"
)
expected_frame = frame_factory.build_goaway_frame(
last_stream_id=1,
error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR,
)
assert c.data_to_send() == expected_frame.serialize()
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