115 lines
5.3 KiB
C++
115 lines
5.3 KiB
C++
#include "sender_harness.hh"
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#include "wrapping_integers.hh"
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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 <optional>
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#include <stdexcept>
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#include <string>
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using namespace std;
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int main() {
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try {
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auto rd = get_random_generator();
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{
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TCPConfig cfg;
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WrappingInt32 isn(rd());
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uint16_t retx_timeout = uniform_int_distribution<uint16_t>{10, 10000}(rd);
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cfg.fixed_isn = isn;
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cfg.rt_timeout = retx_timeout;
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TCPSenderTestHarness test{"Retx SYN twice at the right times, then ack", cfg};
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test.execute(ExpectSegment{}.with_no_flags().with_syn(true).with_payload_size(0).with_seqno(isn));
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test.execute(ExpectNoSegment{});
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test.execute(ExpectState{TCPSenderStateSummary::SYN_SENT});
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test.execute(Tick{retx_timeout - 1u});
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test.execute(ExpectNoSegment{});
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test.execute(Tick{1});
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test.execute(ExpectSegment{}.with_no_flags().with_syn(true).with_payload_size(0).with_seqno(isn));
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test.execute(ExpectState{TCPSenderStateSummary::SYN_SENT});
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test.execute(ExpectBytesInFlight{1});
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// Wait twice as long b/c exponential back-off
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test.execute(Tick{2 * retx_timeout - 1u});
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test.execute(ExpectNoSegment{});
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test.execute(Tick{1});
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test.execute(ExpectSegment{}.with_no_flags().with_syn(true).with_payload_size(0).with_seqno(isn));
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test.execute(ExpectState{TCPSenderStateSummary::SYN_SENT});
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test.execute(ExpectBytesInFlight{1});
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test.execute(AckReceived{WrappingInt32{isn + 1}});
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test.execute(ExpectState{TCPSenderStateSummary::SYN_ACKED});
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test.execute(ExpectBytesInFlight{0});
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}
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{
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TCPConfig cfg;
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WrappingInt32 isn(rd());
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uint16_t retx_timeout = uniform_int_distribution<uint16_t>{10, 10000}(rd);
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cfg.fixed_isn = isn;
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cfg.rt_timeout = retx_timeout;
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TCPSenderTestHarness test{"Retx SYN until too many retransmissions", cfg};
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test.execute(ExpectSegment{}.with_no_flags().with_syn(true).with_payload_size(0).with_seqno(isn));
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test.execute(ExpectNoSegment{});
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test.execute(ExpectState{TCPSenderStateSummary::SYN_SENT});
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for (size_t attempt_no = 0; attempt_no < TCPConfig::MAX_RETX_ATTEMPTS; attempt_no++) {
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test.execute(Tick{(retx_timeout << attempt_no) - 1u}.with_max_retx_exceeded(false));
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test.execute(ExpectNoSegment{});
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test.execute(Tick{1}.with_max_retx_exceeded(false));
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test.execute(ExpectSegment{}.with_no_flags().with_syn(true).with_payload_size(0).with_seqno(isn));
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test.execute(ExpectState{TCPSenderStateSummary::SYN_SENT});
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test.execute(ExpectBytesInFlight{1});
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}
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test.execute(Tick{(retx_timeout << TCPConfig::MAX_RETX_ATTEMPTS) - 1u}.with_max_retx_exceeded(false));
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test.execute(Tick{1}.with_max_retx_exceeded(true));
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}
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{
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TCPConfig cfg;
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WrappingInt32 isn(rd());
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uint16_t retx_timeout = uniform_int_distribution<uint16_t>{10, 10000}(rd);
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cfg.fixed_isn = isn;
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cfg.rt_timeout = retx_timeout;
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TCPSenderTestHarness test{"Send some data, the retx and succeed, then retx till limit", cfg};
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test.execute(ExpectSegment{}.with_no_flags().with_syn(true).with_payload_size(0).with_seqno(isn));
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test.execute(ExpectNoSegment{});
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test.execute(AckReceived{WrappingInt32{isn + 1}});
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test.execute(WriteBytes{"abcd"});
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test.execute(ExpectSegment{}.with_payload_size(4));
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test.execute(ExpectNoSegment{});
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test.execute(AckReceived{WrappingInt32{isn + 5}});
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test.execute(ExpectBytesInFlight{0});
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test.execute(WriteBytes{"efgh"});
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test.execute(ExpectSegment{}.with_payload_size(4));
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test.execute(ExpectNoSegment{});
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test.execute(Tick{retx_timeout}.with_max_retx_exceeded(false));
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test.execute(ExpectSegment{}.with_payload_size(4));
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test.execute(ExpectNoSegment{});
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test.execute(AckReceived{WrappingInt32{isn + 9}});
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test.execute(ExpectBytesInFlight{0});
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test.execute(WriteBytes{"ijkl"});
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test.execute(ExpectSegment{}.with_payload_size(4).with_seqno(isn + 9));
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for (size_t attempt_no = 0; attempt_no < TCPConfig::MAX_RETX_ATTEMPTS; attempt_no++) {
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test.execute(Tick{(retx_timeout << attempt_no) - 1u}.with_max_retx_exceeded(false));
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test.execute(ExpectNoSegment{});
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test.execute(Tick{1}.with_max_retx_exceeded(false));
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test.execute(ExpectSegment{}.with_payload_size(4).with_seqno(isn + 9));
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test.execute(ExpectState{TCPSenderStateSummary::SYN_ACKED});
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test.execute(ExpectBytesInFlight{4});
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}
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test.execute(Tick{(retx_timeout << TCPConfig::MAX_RETX_ATTEMPTS) - 1u}.with_max_retx_exceeded(false));
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test.execute(Tick{1}.with_max_retx_exceeded(true));
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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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