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send_transmit.cc
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#include "sender_harness.hh"
#include "wrapping_integers.hh"
#include <cstdint>
#include <cstdlib>
#include <exception>
#include <iostream>
#include <optional>
#include <stdexcept>
#include <string>
using namespace std;
int main() {
try {
auto rd = get_random_generator();
{
TCPConfig cfg;
WrappingInt32 isn(rd());
cfg.fixed_isn = isn;
TCPSenderTestHarness test{"Three short writes", cfg};
test.execute(ExpectSegment{}.with_no_flags().with_syn(true).with_payload_size(0).with_seqno(isn));
test.execute(AckReceived{WrappingInt32{isn + 1}});
test.execute(ExpectState{TCPSenderStateSummary::SYN_ACKED});
test.execute(WriteBytes{"ab"});
test.execute(ExpectSegment{}.with_data("ab").with_seqno(isn + 1));
test.execute(WriteBytes{"cd"});
test.execute(ExpectSegment{}.with_data("cd").with_seqno(isn + 3));
test.execute(WriteBytes{"abcd"});
test.execute(ExpectSegment{}.with_data("abcd").with_seqno(isn + 5));
test.execute(ExpectSeqno{WrappingInt32{isn + 9}});
test.execute(ExpectBytesInFlight{8});
test.execute(ExpectState{TCPSenderStateSummary::SYN_ACKED});
}
{
TCPConfig cfg;
WrappingInt32 isn(rd());
cfg.fixed_isn = isn;
TCPSenderTestHarness test{"Many short writes, continuous acks", cfg};
test.execute(ExpectSegment{}.with_no_flags().with_syn(true).with_payload_size(0).with_seqno(isn));
test.execute(AckReceived{WrappingInt32{isn + 1}});
test.execute(ExpectState{TCPSenderStateSummary::SYN_ACKED});
uint32_t max_block_size = 10;
uint32_t n_rounds = 10000;
size_t bytes_sent = 0;
for (uint32_t i = 0; i < n_rounds; ++i) {
string data;
uint32_t block_size = uniform_int_distribution<uint32_t>{1, max_block_size}(rd);
for (uint8_t j = 0; j < block_size; ++j) {
uint8_t c = 'a' + ((i + j) % 26);
data.push_back(c);
}
test.execute(ExpectSeqno{WrappingInt32{isn + uint32_t(bytes_sent) + 1}});
test.execute(WriteBytes(string(data)));
bytes_sent += block_size;
test.execute(ExpectBytesInFlight{block_size});
test.execute(
ExpectSegment{}.with_seqno(isn + 1 + uint32_t(bytes_sent - block_size)).with_data(move(data)));
test.execute(ExpectNoSegment{});
test.execute(AckReceived{WrappingInt32{isn + 1 + uint32_t(bytes_sent)}});
}
}
{
TCPConfig cfg;
WrappingInt32 isn(rd());
cfg.fixed_isn = isn;
TCPSenderTestHarness test{"Many short writes, ack at end", cfg};
test.execute(ExpectSegment{}.with_no_flags().with_syn(true).with_payload_size(0).with_seqno(isn));
test.execute(AckReceived{WrappingInt32{isn + 1}}.with_win(65000));
test.execute(ExpectState{TCPSenderStateSummary::SYN_ACKED});
uint32_t max_block_size = 10;
uint32_t n_rounds = 1000;
size_t bytes_sent = 0;
for (uint32_t i = 0; i < n_rounds; ++i) {
string data;
uint32_t block_size = uniform_int_distribution<uint32_t>{1, max_block_size}(rd);
for (uint8_t j = 0; j < block_size; ++j) {
uint8_t c = 'a' + ((i + j) % 26);
data.push_back(c);
}
test.execute(ExpectSeqno{WrappingInt32{isn + uint32_t(bytes_sent) + 1}});
test.execute(WriteBytes(string(data)));
bytes_sent += block_size;
test.execute(ExpectBytesInFlight{bytes_sent});
test.execute(
ExpectSegment{}.with_seqno(isn + 1 + uint32_t(bytes_sent - block_size)).with_data(move(data)));
test.execute(ExpectNoSegment{});
}
test.execute(ExpectBytesInFlight{bytes_sent});
test.execute(AckReceived{WrappingInt32{isn + 1 + uint32_t(bytes_sent)}});
test.execute(ExpectBytesInFlight{0});
}
{
TCPConfig cfg;
WrappingInt32 isn(rd());
cfg.fixed_isn = isn;
TCPSenderTestHarness test{"Window filling", cfg};
test.execute(ExpectSegment{}.with_no_flags().with_syn(true).with_payload_size(0).with_seqno(isn));
test.execute(AckReceived{WrappingInt32{isn + 1}}.with_win(3));
test.execute(ExpectState{TCPSenderStateSummary::SYN_ACKED});
test.execute(WriteBytes("01234567"));
test.execute(ExpectBytesInFlight{3});
test.execute(ExpectSegment{}.with_data("012"));
test.execute(ExpectNoSegment{});
test.execute(ExpectSeqno{WrappingInt32{isn + 1 + 3}});
test.execute(AckReceived{WrappingInt32{isn + 1 + 3}}.with_win(3));
test.execute(ExpectBytesInFlight{3});
test.execute(ExpectSegment{}.with_data("345"));
test.execute(ExpectNoSegment{});
test.execute(ExpectSeqno{WrappingInt32{isn + 1 + 6}});
test.execute(AckReceived{WrappingInt32{isn + 1 + 6}}.with_win(3));
test.execute(ExpectBytesInFlight{2});
test.execute(ExpectSegment{}.with_data("67"));
test.execute(ExpectNoSegment{});
test.execute(ExpectSeqno{WrappingInt32{isn + 1 + 8}});
test.execute(AckReceived{WrappingInt32{isn + 1 + 8}}.with_win(3));
test.execute(ExpectBytesInFlight{0});
test.execute(ExpectNoSegment{});
}
{
TCPConfig cfg;
WrappingInt32 isn(rd());
cfg.fixed_isn = isn;
TCPSenderTestHarness test{"Immediate writes respect the window", cfg};
test.execute(ExpectSegment{}.with_no_flags().with_syn(true).with_payload_size(0).with_seqno(isn));
test.execute(AckReceived{WrappingInt32{isn + 1}}.with_win(3));
test.execute(ExpectState{TCPSenderStateSummary::SYN_ACKED});
test.execute(WriteBytes("01"));
test.execute(ExpectBytesInFlight{2});
test.execute(ExpectSegment{}.with_data("01"));
test.execute(ExpectNoSegment{});
test.execute(ExpectSeqno{WrappingInt32{isn + 1 + 2}});
test.execute(WriteBytes("23"));
test.execute(ExpectBytesInFlight{3});
test.execute(ExpectSegment{}.with_data("2"));
test.execute(ExpectNoSegment{});
test.execute(ExpectSeqno{WrappingInt32{isn + 1 + 3}});
}
} catch (const exception &e) {
cerr << e.what() << endl;
return 1;
}
return EXIT_SUCCESS;
}