716 lines
24 KiB
C++
716 lines
24 KiB
C++
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#if defined(__linux__)
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#include "driver-linux.cpp"
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#elif defined(_WIN32)
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#include "driver-windows.cpp"
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#endif
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#define POLLVEC_SIZE (DRV_MAX_CHAN + 1)
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#define MAX_BIO_BUFFER (128 * 1024)
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static void if_error_print_and_exit(const std::string_view str) {
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if (!str.empty()) {
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std::cerr << std::endl << "error: " << str << std::endl;
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exit(1);
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}
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}
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// DPrints are currently not going through the readline device.
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// doing so would not currently be thread-safe. Do I care about
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// that? I'm not sure.
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static void dprint_callback(const char *oneline, size_t size) {
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fwrite("**", 1, 2, stderr);
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fwrite(oneline, 1, size, stderr);
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fwrite("\n", 1, 1, stderr);
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fflush(stderr);
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}
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inline bool file_exists(const std::filesystem::path &name) {
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std::ifstream f(name);
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return f.good();
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}
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std::filesystem::path find_luprex_root(std::filesystem::path exepath) {
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std::filesystem::path pp = exepath.parent_path();
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if (file_exists(pp / "lua/control.lst")) {
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return pp;
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}
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pp = pp.parent_path();
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if (file_exists(pp / "lua/control.lst")) {
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return pp;
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}
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pp = pp.parent_path();
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if (file_exists(pp / "lua/control.lst")) {
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return pp;
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}
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assert(false && "Could not find lua/control.lst");
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return "";
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}
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class Driver {
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public:
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enum ChanState {
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CHAN_INACTIVE,
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CHAN_PLAINTEXT,
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CHAN_SSL_CONNECTING,
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CHAN_SSL_ACCEPTING,
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CHAN_SSL_READWRITE,
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};
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struct ChanInfo {
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int chid;
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SOCKET socket;
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SSL *ssl;
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BIO *recv_bio;
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BIO *send_bio;
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// If recent_error is set, that means that a recent IO operation generated
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// an error. As a special case, EOF on read is considered an error, we use
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// the string "EOF" for this case.
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std::string recent_error;
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// OpenSSL has a rule: if you try to SSL_write and it returns
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// SSL_ERROR_WANT_READ, then you have to retry the write with the same
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// number of bytes. In this event, we record how many bytes we
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// attempted to write, which will enable us to retry.
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int retry_write_nbytes;
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// True if the channel needs to be advanced.
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bool need_advance;
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ChanState state;
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uint32_t nbytes;
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const char *bytes;
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bool marked_for_deletion() const { return state == CHAN_INACTIVE; }
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};
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std::filesystem::path luprexroot;
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EngineWrapper engw;
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std::vector<ChanInfo> chans_;
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std::map<int, SOCKET> listen_sockets_;
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bool read_console_recently_;
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std::unique_ptr<struct pollfd[]> pollvec_;
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std::unique_ptr<char[]> chbuf_;
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ReadlineDevice readline_device_;
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std::string console_command_;
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sslutil::UniqueCTX ssl_server_ctx_;
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sslutil::UniqueCTX ssl_client_secure_ctx_;
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sslutil::UniqueCTX ssl_client_insecure_ctx_;
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// Return the amount of 'space left' in a BIO. This is a fiction,
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// because MEM BIOs technically have unlimited capacity. We're
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// artificially limiting them to a certain size because there's no
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// reason to buffer huge amounts of data.
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//
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int bio_space(BIO *bio) {
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int space = (MAX_BIO_BUFFER) - BIO_pending(bio);
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if (space < 0) space = 0;
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return space;
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}
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// This is a terribly inefficient way to discard data that has
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// already been processed. There has to be something better.
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//
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void bio_discard(BIO *b, int nbytes) {
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while (nbytes > 0) {
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int nread = nbytes;
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if (nread > DRV_SHORTSTRING_SIZE) nread = DRV_SHORTSTRING_SIZE;
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int ndropped = BIO_read(b, chbuf_.get(), nread);
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assert(ndropped == nread);
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nbytes -= ndropped;
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}
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}
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void make_channel(SOCKET sock, int chid, SSL_CTX *ctx, ChanState state) {
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ChanInfo newchan;
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newchan.chid = chid;
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newchan.socket = sock;
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newchan.recv_bio = BIO_new(BIO_s_mem());
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newchan.send_bio = BIO_new(BIO_s_mem());
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newchan.recent_error.clear();
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newchan.retry_write_nbytes = 0;
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newchan.need_advance = true;
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if (state == CHAN_PLAINTEXT) {
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newchan.ssl = nullptr;
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} else {
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newchan.ssl = SSL_new(ctx);
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SSL_set_bio(newchan.ssl, newchan.recv_bio, newchan.send_bio);
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}
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newchan.state = state;
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newchan.nbytes = 0;
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newchan.bytes = 0;
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chans_.push_back(newchan);
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}
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void close_channel(ChanInfo &chan, std::string_view err) {
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// std::cerr << "Closing channel " << chan.chid << " with " << err << std::endl;
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assert(chan.state != CHAN_INACTIVE);
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// Close and release the SSL channel.
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// This frees the BIO objects as well.
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if (chan.ssl != nullptr) {
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SSL_free(chan.ssl);
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chan.ssl = nullptr;
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}
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chan.recv_bio = nullptr;
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chan.send_bio = nullptr;
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chan.recent_error.clear();
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chan.retry_write_nbytes = 0;
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chan.need_advance = false;
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// Close and release the socket.
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assert(chan.socket != INVALID_SOCKET);
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assert(socket_close(chan.socket) == 0);
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chan.socket = INVALID_SOCKET;
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// Close everything else.
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engw.play_notify_close(&engw, chan.chid, err.size(), err.data());
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chan.state = CHAN_INACTIVE;
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chan.chid = -1;
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chan.nbytes = 0;
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chan.bytes = 0;
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}
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void handle_listen_ports() {
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uint32_t nports; const uint32_t *ports;
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engw.get_listen_ports(&engw, &nports, &ports);
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for (uint32_t i = 0; i < nports; i++) {
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int port = ports[i];
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if (listen_sockets_.find(port) == listen_sockets_.end()) {
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std::string err;
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SOCKET sock = listen_on_port(port, err);
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if_error_print_and_exit(err);
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assert(sock != INVALID_SOCKET);
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listen_sockets_[port] = sock;
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}
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}
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}
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void handle_lua_source() {
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if (engw.get_rescan_lua_source(&engw)) {
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drvutil::ostringstream oss;
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std::string err = drvutil::package_lua_source(".", &oss);
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if_error_print_and_exit(err);
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std::string_view ossv = oss.view();
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engw.play_access(&engw, AccessKind::INVOKE_LUA_SOURCE, 0, ossv.size(), ossv.data(), nullptr, nullptr);
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}
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}
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void channel_printbuffer() {
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if (engw.get_have_prints(&engw)) {
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uint32_t ndata;
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const char *data;
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engw.play_access(&engw, AccessKind::CHANNEL_PRINTS, 0, 0, "", &ndata, &data);
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if (ndata > 0) {
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if (ndata > DRV_SHORTSTRING_SIZE) ndata = DRV_SHORTSTRING_SIZE;
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readline_device_.printline(std::string_view(data, ndata));
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}
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}
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}
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void add_console_command(std::string_view addition)
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{
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std::string cmd = console_command_ + std::string(addition);
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console_command_.clear();
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uint32_t ndata;
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const char *data;
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engw.play_access(&engw, AccessKind::VALIDATE_LUA_EXPR,
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0, cmd.size(), cmd.c_str(), &ndata, &data);
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std::string_view message(data, ndata);
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// Handle the command.
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if (message == "truncated lua") {
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console_command_ = cmd;
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} else if (message == "white space") {
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readline_device_.printline("white space.");
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} else if (message == "slash command") {
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readline_device_.printline("slash command.");
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} else if (message.empty()) {
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readline_device_.printline("valid lua");
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} else {
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readline_device_.printline(message);
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}
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if (console_command_.empty()) {
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readline_device_.set_prompt(">");
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} else {
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readline_device_.set_prompt(">>");
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}
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}
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void handle_console_input() {
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read_console_recently_ = false;
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while (true) {
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std::u32string cps = console_read();
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if (cps.size() == 0) break;
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read_console_recently_ = true;
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for (char32_t c : cps) {
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std::string line = readline_device_.putcode(c);
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if (!line.empty()) {
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add_console_command(line);
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}
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}
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}
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}
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void handle_new_outgoing_sockets() {
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uint32_t nchids; const uint32_t *chids;
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engw.get_new_outgoing(&engw, &nchids, &chids);
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for (uint32_t i = 0; i < nchids; i++) {
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uint32_t chid = chids[i];
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std::string err, cert, host, port;
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const char *target = engw.get_target(&engw, chid);
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drvutil::split_target(target, cert, host, port);
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if (cert.empty() || host.empty() || port.empty()) {
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std::string message = "invalid target: ";
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message += target;
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engw.play_notify_close(&engw, chid, message.size(), message.c_str());
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continue;
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}
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SSL_CTX *ctx = nullptr;
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if (cert == "cert") {
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ctx = ssl_client_secure_ctx_.get();
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} else if (cert == "nocert") {
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ctx = ssl_client_insecure_ctx_.get();
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} else {
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std::string message = "invalid cert rule: ";
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message += target;
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engw.play_notify_close(&engw, chid, message.size(), message.c_str());
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continue;
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}
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SOCKET sock = open_connection(host.c_str(), port.c_str(), err);
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if (sock == INVALID_SOCKET) {
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engw.play_notify_close(&engw, chid, err.size(), err.c_str());
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continue;
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}
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make_channel(sock, chid, ctx, CHAN_SSL_CONNECTING);
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}
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engw.play_clear_new_outgoing(&engw);
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}
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void accept_connection(int port, SOCKET sock) {
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std::string err;
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SOCKET socket = accept_on_socket(sock, err);
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if_error_print_and_exit(err);
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if (socket != INVALID_SOCKET) {
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uint32_t chid = engw.play_notify_accept(&engw, port);
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make_channel(socket, chid, ssl_server_ctx_.get(), CHAN_SSL_ACCEPTING);
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}
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}
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// Copy data from the socket into the recv bio.
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//
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// If it detects an error or EOF, sets the recent_errno flag.
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//
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void transfer_socket_to_recv_bio(ChanInfo &chan) {
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if ((chan.state == CHAN_INACTIVE) || (!chan.recent_error.empty())) {
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return;
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}
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std::string err;
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int nread = socket_recv(chan.socket, chbuf_.get(), DRV_SHORTSTRING_SIZE, err);
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// std::cerr << "chan " << chan.chid << " recv " << nread << " err=" << err << std::endl;
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if (nread < 0) {
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chan.recent_error = err;
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} else {
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if (nread == 0) {
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chan.recent_error = "EOF";
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} else {
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int nstored = BIO_write(chan.recv_bio, chbuf_.get(), nread);
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assert(nstored == nread);
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chan.need_advance = true;
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// std::cerr << "chan " << chan.chid << " stored " << nread << " bytes" << std::endl;
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}
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}
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}
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// Copy data from the send BIO into the socket.
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//
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// If it detects an error, sets the recent_errno flag.
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// It is an error to call this when there is nothing in the send BIO.
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//
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void transfer_send_bio_to_socket(ChanInfo &chan) {
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if ((chan.state == CHAN_INACTIVE) || (!chan.recent_error.empty())) {
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return;
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}
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char *data;
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int ndata = BIO_get_mem_data(chan.send_bio, &data);
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if (ndata > DRV_SHORTSTRING_SIZE) ndata = DRV_SHORTSTRING_SIZE;
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// It is an error to call this function when there is nothing in the send BIO.
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assert(ndata > 0);
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std::string err;
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int nwrote = socket_send(chan.socket, data, ndata, err);
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// std::cerr << "chan " << chan.chid << " send " << nwrote << " err=" << err << std::endl;
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if (nwrote < 0) {
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chan.recent_error = err;
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} else {
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assert(nwrote != 0);
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bio_discard(chan.send_bio, nwrote);
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chan.need_advance = true;
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}
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}
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// Close the channel if there's a serious OpenSSL error.
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//
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// The 'retval' is the return value of the SSL function that returned an
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// error.
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//
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// All errors are considered serious except for SSL_ERROR_WANT_READ, which
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// is not serious because it is transient. However, if you get an
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// SSL_ERROR_WANT_READ when there's tons of data available in the read
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// buffer, that's inexplicable and therefore serious.
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//
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void if_error_is_serious_close_channel(ChanInfo &chan, int retval) {
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int error = SSL_get_error(chan.ssl, retval);
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//std::cerr << "chan " << chan.chid << " ssl error = " << error << std::endl;
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// Should never have write errors, because we're
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// using a memory BIO with unlimited capacity.
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assert(error != SSL_ERROR_WANT_WRITE);
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// If we get a read error, make sure it's plausible:
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// if the recv bio is full, that makes no sense.
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if (error == SSL_ERROR_WANT_READ) {
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if (bio_space(chan.recv_bio) == 0) {
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close_channel(chan, "ssl waiting for data, but there's tons of data");
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}
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return;
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}
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// Any other error is an actual error. Close
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// the channel.
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std::string errstr = sslutil::error_string();
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if (errstr == "") errstr = "unknown error";
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close_channel(chan, errstr);
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}
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void advance_plaintext(ChanInfo &chan) {
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uint32_t ndata; const char *data;
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// Transfer all data from the recv BIO into the channel.
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ndata = BIO_get_mem_data(chan.recv_bio, &data);
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if (ndata > 0) {
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engw.play_recv_incoming(&engw, chan.chid, ndata, data);
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bio_discard(chan.recv_bio, ndata);
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}
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// Transfer all data from the channel to the send BIO.
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engw.get_outgoing(&engw, chan.chid, &ndata, &data);
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if (ndata > 0) {
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int nwrote = BIO_write(chan.send_bio, data, ndata);
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assert(nwrote == int(ndata));
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engw.play_sent_outgoing(&engw, chan.chid, ndata);
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}
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}
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void advance_ssl_connecting(ChanInfo &chan) {
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int retval = SSL_connect(chan.ssl);
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//std::cerr << "chan " << chan.chid << " ssl_connect returns " << retval << std::endl;
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if (retval == 1) {
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chan.state = CHAN_SSL_READWRITE;
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chan.need_advance = true;
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} else {
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if_error_is_serious_close_channel(chan, retval);
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}
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}
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void advance_ssl_accepting(ChanInfo &chan) {
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int retval = SSL_accept(chan.ssl);
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//std::cerr << "chan " << chan.chid << " ssl_accept returns " << retval << std::endl;
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if (retval == 1) {
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chan.state = CHAN_SSL_READWRITE;
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chan.need_advance = true;
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} else {
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if_error_is_serious_close_channel(chan, retval);
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}
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}
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void advance_ssl_readwrite(ChanInfo &chan) {
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// Read as much as we can, which of course will be limited
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// by the fact that the recv_bio contains finite data.
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while (true) {
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int read_result = SSL_read(chan.ssl, chbuf_.get(), DRV_SHORTSTRING_SIZE);
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if (read_result > 0) {
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engw.play_recv_incoming(&engw, chan.chid, read_result, chbuf_.get());
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} else {
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if_error_is_serious_close_channel(chan, read_result);
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break;
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}
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}
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// The read process could have generated an error which could
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// have closed the channel. If so, don't try writing.
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if (chan.state == CHAN_INACTIVE) {
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return;
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}
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// Try to write data.
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while (chan.nbytes) {
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uint32_t wbytes;
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if (chan.retry_write_nbytes > 0) {
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wbytes = chan.retry_write_nbytes;
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assert(wbytes < chan.nbytes);
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} else {
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wbytes = chan.nbytes;
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if (wbytes > DRV_SHORTSTRING_SIZE) wbytes = DRV_SHORTSTRING_SIZE;
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}
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if (wbytes == 0) break;
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int write_result = SSL_write(chan.ssl, chan.bytes, wbytes);
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if (write_result > 0) {
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engw.play_sent_outgoing(&engw, chan.chid, write_result);
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chan.retry_write_nbytes = 0;
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chan.nbytes -= write_result;
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chan.bytes += write_result;
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} else {
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if_error_is_serious_close_channel(chan, write_result);
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chan.retry_write_nbytes = wbytes;
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break;
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}
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}
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}
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void advance_channel(ChanInfo &chan) {
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sslutil::clear_all_errors();
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// We set the need_advance flag to false here, but
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// the rest of the advance routine is allowed to set
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// it back to true in the event that the advance routine
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// only processes some of the available data.
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chan.need_advance = false;
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|
|
|
switch (chan.state) {
|
|
case CHAN_PLAINTEXT:
|
|
advance_plaintext(chan);
|
|
break;
|
|
case CHAN_SSL_CONNECTING:
|
|
advance_ssl_connecting(chan);
|
|
break;
|
|
case CHAN_SSL_ACCEPTING:
|
|
advance_ssl_accepting(chan);
|
|
break;
|
|
case CHAN_SSL_READWRITE:
|
|
advance_ssl_readwrite(chan);
|
|
break;
|
|
default:
|
|
assert(false);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void handle_socket_input_output() {
|
|
std::string err;
|
|
int mstimeout = read_console_recently_ ? 10 : 100;
|
|
|
|
// Peek output buffers and determine channel release flags.
|
|
bool any_released = false;
|
|
for (ChanInfo &chan : chans_) {
|
|
engw.get_outgoing(&engw, chan.chid, &chan.nbytes, &chan.bytes);
|
|
if (chan.nbytes > 0) {
|
|
chan.need_advance = true;
|
|
}
|
|
if (chan.nbytes == 0) {
|
|
if (engw.get_channel_released(&engw, chan.chid)) {
|
|
if (BIO_pending(chan.send_bio) == 0) {
|
|
close_channel(chan, "");
|
|
any_released = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Delete any released channels
|
|
if (any_released) {
|
|
drvutil::remove_marked_items(chans_);
|
|
}
|
|
|
|
// Construct the struct pollfd vector.
|
|
int pollsize = 0;
|
|
for (const ChanInfo &chan : chans_) {
|
|
struct pollfd &pfd = pollvec_[pollsize++];
|
|
assert(chan.socket != INVALID_SOCKET);
|
|
pfd.fd = chan.socket;
|
|
pfd.events = 0;
|
|
pfd.revents = 0;
|
|
// If there's room in the receive buffer, set POLLIN
|
|
if (bio_space(chan.recv_bio) > 0) {
|
|
pfd.events |= POLLIN;
|
|
}
|
|
// If there's data in the outgoing buffer, set POLLOUT
|
|
if (BIO_pending(chan.send_bio) > 0) {
|
|
pfd.events |= POLLOUT;
|
|
}
|
|
if (chan.need_advance) {
|
|
mstimeout = 0;
|
|
}
|
|
}
|
|
for (const auto &p : listen_sockets_) {
|
|
struct pollfd &pfd = pollvec_[pollsize++];
|
|
pfd.fd = p.second;
|
|
pfd.events = POLLIN;
|
|
pfd.revents = 0;
|
|
}
|
|
|
|
// Do the poll.
|
|
socket_poll(pollvec_.get(), pollsize, mstimeout, err);
|
|
if_error_print_and_exit(err);
|
|
|
|
// Advance channels where possible and then check listen sockets.
|
|
int index = 0;
|
|
for (ChanInfo &chan : chans_) {
|
|
struct pollfd &pfd = pollvec_[index++];
|
|
if ((pfd.revents & POLLIN) != 0) {
|
|
transfer_socket_to_recv_bio(chan);
|
|
}
|
|
if ((pfd.revents & POLLOUT) != 0) {
|
|
transfer_send_bio_to_socket(chan);
|
|
}
|
|
if (chan.need_advance || (!chan.recent_error.empty())) {
|
|
advance_channel(chan);
|
|
}
|
|
if (!chan.recent_error.empty()) {
|
|
if (chan.recent_error == "EOF") {
|
|
close_channel(chan, "");
|
|
} else {
|
|
close_channel(chan, chan.recent_error);
|
|
}
|
|
chan.recent_error.clear();
|
|
}
|
|
chan.nbytes = 0;
|
|
chan.bytes = 0;
|
|
}
|
|
for (auto &p : listen_sockets_) {
|
|
struct pollfd &pfd = pollvec_[index++];
|
|
if (pfd.revents & (POLLIN | POLLERR)) {
|
|
accept_connection(p.first, p.second);
|
|
}
|
|
}
|
|
|
|
// Delete any newly-inactive channels
|
|
drvutil::remove_marked_items(chans_);
|
|
}
|
|
|
|
int replay_logfile(const char *fn, bool verbose) {
|
|
engw.replay_initialize(&engw, fn);
|
|
if_error_print_and_exit(engw.error);
|
|
while (engw.rlog) {
|
|
engw.replay_step(&engw);
|
|
}
|
|
if_error_print_and_exit(engw.error);
|
|
return 0;
|
|
}
|
|
|
|
static void replay_cb_sent_outgoing(void *vp, int chid, int ndata, const char *data) {
|
|
if (chid == 0) {
|
|
std::cerr.write(data, ndata);
|
|
}
|
|
}
|
|
|
|
int drive(int argc, char *argv[]) {
|
|
// Set up the console readline device.
|
|
readline_device_.set_print_callback(console_write);
|
|
readline_device_.set_prompt(">");
|
|
console_command_.clear();
|
|
|
|
// Remove the program name from argv.
|
|
std::string program = argv[0];
|
|
argc -= 1;
|
|
argv += 1;
|
|
|
|
// Find the root of the luprex tree.
|
|
luprexroot = find_luprex_root(get_exe_path());
|
|
|
|
// Load the DLL and gain access to its functions.
|
|
call_init_engine_wrapper(luprexroot, &engw);
|
|
engw.replay_cb_sent_outgoing = replay_cb_sent_outgoing;
|
|
engw.hook_dprint(dprint_callback);
|
|
|
|
// If argv contains "replay <filename>", do a replay,
|
|
// and then skip everything else.
|
|
if (argc >= 1) {
|
|
std::string cmd(argv[0]);
|
|
if ((cmd == "replay") || (cmd == "vreplay")) {
|
|
if (argc != 2) {
|
|
std::cerr << "usage: " << program << " replay <filename>"
|
|
<< std::endl;
|
|
return 1;
|
|
}
|
|
return replay_logfile(argv[1], cmd == "vreplay");
|
|
}
|
|
}
|
|
|
|
// If argv contains "record <filename>", start recording,
|
|
// and remove the "record <filename>" from argv.
|
|
std::string replaylogfn;
|
|
if (argc >= 1) {
|
|
std::string cmd = argv[0];
|
|
if (cmd == "record") {
|
|
if (argc < 2) {
|
|
std::cerr << "The 'record' command must be followed by a filename" << std::endl;
|
|
return 1;
|
|
}
|
|
replaylogfn = argv[1];
|
|
argc -= 2;
|
|
argv += 2;
|
|
}
|
|
}
|
|
|
|
// Make sure there's exactly one argument left for the engine type.
|
|
if (argc != 1) {
|
|
std::cerr << "Must specify the engine type" << std::endl;
|
|
return 1;
|
|
}
|
|
|
|
// Initialize state variables.
|
|
read_console_recently_ = false;
|
|
chbuf_.reset(new char[DRV_SHORTSTRING_SIZE]);
|
|
pollvec_.reset(new struct pollfd[POLLVEC_SIZE]);
|
|
|
|
ssl_server_ctx_.reset(sslutil::new_context(SSL_VERIFY_NONE));
|
|
ssl_client_secure_ctx_.reset(sslutil::new_context(SSL_VERIFY_PEER));
|
|
ssl_client_insecure_ctx_.reset(sslutil::new_context(SSL_VERIFY_NONE));
|
|
ssl_load_certificate_authorities(ssl_client_secure_ctx_.get());
|
|
sslutil::ctx_load_dummy_cert(ssl_server_ctx_.get());
|
|
|
|
// Initialize the engine.
|
|
engw.play_initialize(&engw, argv[0], replaylogfn.c_str());
|
|
if_error_print_and_exit(engw.error);
|
|
|
|
// Set up listening ports.
|
|
handle_listen_ports();
|
|
|
|
// Main loop.
|
|
while (!engw.get_stop_driver(&engw)) {
|
|
handle_lua_source();
|
|
handle_new_outgoing_sockets();
|
|
handle_socket_input_output();
|
|
handle_console_input();
|
|
engw.play_update(&engw, drvutil::get_monotonic_clock());
|
|
channel_printbuffer();
|
|
}
|
|
|
|
// Cleanup
|
|
for (ChanInfo &chan : chans_) {
|
|
close_channel(chan, "");
|
|
}
|
|
engw.release(&engw);
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
int main(int argc, char **argv) {
|
|
os_initialize(argc, argv);
|
|
assert(OPENSSL_init_ssl(0, NULL) == 1);
|
|
sslutil::clear_all_errors();
|
|
Driver driver;
|
|
return driver.drive(argc, argv);
|
|
}
|
|
|