81 lines
2.7 KiB
C++
81 lines
2.7 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 "util.hh"
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#include <algorithm>
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#include <cstdint>
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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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#include <tuple>
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#include <vector>
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using namespace std;
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using State = TCPTestHarness::State;
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static constexpr unsigned NREPS = 32;
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int main() {
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try {
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TCPConfig cfg{};
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cfg.recv_capacity = 65000;
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auto rd = get_random_generator();
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// loop segments back in a different order
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for (unsigned rep_no = 0; rep_no < NREPS; ++rep_no) {
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const WrappingInt32 rx_offset(rd());
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TCPTestHarness test_2 = TCPTestHarness::in_established(cfg, rx_offset - 1, rx_offset - 1);
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test_2.send_ack(rx_offset, rx_offset, 65000);
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string d(cfg.recv_capacity, 0);
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generate(d.begin(), d.end(), [&] { return rd(); });
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vector<TCPSegment> segs;
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size_t sendoff = 0;
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while (sendoff < d.size()) {
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const size_t len = min(d.size() - sendoff, static_cast<size_t>(rd()) % 8192);
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if (len == 0) {
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continue;
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}
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test_2.execute(Write{d.substr(sendoff, len)});
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test_2.execute(Tick(1));
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test_2.execute(ExpectSegmentAvailable{}, "test 2 failed: cannot read after write()");
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while (test_2.can_read()) {
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segs.emplace_back(test_2.expect_seg(ExpectSegment{}));
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}
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sendoff += len;
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}
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// resend them in shuffled order
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vector<size_t> seg_idx(segs.size(), 0);
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iota(seg_idx.begin(), seg_idx.end(), 0);
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shuffle(seg_idx.begin(), seg_idx.end(), rd);
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vector<TCPSegment> acks;
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for (auto idx : seg_idx) {
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test_2.execute(SendSegment{std::move(segs[idx])});
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test_2.execute(Tick(1));
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TCPSegment s = test_2.expect_seg(ExpectOneSegment{}.with_ack(true), "test 2 failed: no ACK after rcvd");
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acks.emplace_back(std::move(s));
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test_2.execute(ExpectNoSegment{}, "test 2 failed: double ACK?");
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}
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// send just the final ack
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test_2.execute(SendSegment{std::move(acks.back())});
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test_2.execute(ExpectNoSegment{}, "test 2 failed: ACK for ACK?");
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test_2.execute(ExpectData{}.with_data(d), "test 2 failed: wrong data after loopback");
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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 EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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