117 lines
3.6 KiB
C++
117 lines
3.6 KiB
C++
#include "tcp_config.hh"
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#include "tcp_expectation.hh"
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#include "tcp_fsm_test_harness.hh"
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#include "tcp_header.hh"
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#include "tcp_segment.hh"
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#include <cstdlib>
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#include <exception>
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#include <iostream>
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#include <stdexcept>
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#include <string>
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using namespace std;
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using State = TCPTestHarness::State;
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int main() {
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try {
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TCPConfig cfg{};
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// test #1: start in LAST_ACK, ack
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{
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TCPTestHarness test_1 = TCPTestHarness::in_last_ack(cfg);
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test_1.execute(Tick(4 * cfg.rt_timeout));
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test_1.execute(ExpectState{State::LAST_ACK});
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test_1.send_ack(WrappingInt32{2}, WrappingInt32{2});
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test_1.execute(Tick(1));
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test_1.execute(ExpectState{State::CLOSED});
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}
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// test #2: start in CLOSE_WAIT, close(), throw away first FIN, ack re-tx FIN
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{
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TCPTestHarness test_2 = TCPTestHarness::in_close_wait(cfg);
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test_2.execute(Tick(4 * cfg.rt_timeout));
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test_2.execute(ExpectState{State::CLOSE_WAIT});
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test_2.execute(Close{});
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test_2.execute(Tick(1));
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test_2.execute(ExpectState{State::LAST_ACK});
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TCPSegment seg1 = test_2.expect_seg(ExpectOneSegment{}.with_fin(true), "test 2 falied: bad seg or no FIN");
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test_2.execute(Tick(cfg.rt_timeout - 2));
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test_2.execute(ExpectNoSegment{}, "test 2 failed: FIN re-tx was too fast");
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test_2.execute(Tick(2));
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TCPSegment seg2 = test_2.expect_seg(ExpectOneSegment{}.with_fin(true).with_seqno(seg1.header().seqno),
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"test 2 failed: bad re-tx FIN");
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const WrappingInt32 rx_seqno{2};
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const auto ack_expect = rx_seqno;
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test_2.send_ack(ack_expect, seg2.header().seqno - 1); // wrong ackno!
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test_2.execute(Tick(1));
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test_2.execute(ExpectState{State::LAST_ACK});
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test_2.send_ack(ack_expect, seg2.header().seqno + 1);
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test_2.execute(Tick(1));
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test_2.execute(ExpectState{State::CLOSED});
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}
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// test #3: start in ESTABLSHED, send FIN, recv ACK, check for CLOSE_WAIT
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{
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TCPTestHarness test_3 = TCPTestHarness::in_established(cfg);
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test_3.execute(Tick(4 * cfg.rt_timeout));
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test_3.execute(ExpectState{State::ESTABLISHED});
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const WrappingInt32 rx_seqno{1};
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const auto ack_expect = rx_seqno + 1;
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test_3.send_fin(rx_seqno, WrappingInt32{0});
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test_3.execute(Tick(1));
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test_3.execute(ExpectOneSegment{}.with_ack(true).with_ackno(ack_expect),
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"test 3 failed: bad seg, no ACK, or wrong ackno");
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test_3.execute(ExpectState{State::CLOSE_WAIT});
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test_3.send_fin(rx_seqno, WrappingInt32{0});
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test_3.execute(Tick(1));
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test_3.execute(ExpectOneSegment{}.with_ack(true).with_ackno(ack_expect),
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"test 3 falied: bad response to 2nd FIN");
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test_3.execute(ExpectState{State::CLOSE_WAIT});
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test_3.execute(Tick(1));
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test_3.execute(Close{});
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test_3.execute(Tick(1));
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test_3.execute(ExpectState{State::LAST_ACK});
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TCPSegment seg3 = test_3.expect_seg(ExpectOneSegment{}.with_fin(true), "test 3 failed: bad seg or no FIN");
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test_3.send_ack(ack_expect, seg3.header().seqno + 1);
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test_3.execute(Tick(1));
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test_3.execute(ExpectState{State::CLOSED});
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}
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} catch (const exception &e) {
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cerr << e.what() << endl;
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return 1;
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}
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return EXIT_SUCCESS;
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}
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