// Matrix Construct // // Copyright (C) Matrix Construct Developers, Authors & Contributors // Copyright (C) 2016-2018 Jason Volk // // Permission to use, copy, modify, and/or distribute this software for any // purpose with or without fee is hereby granted, provided that the above // copyright notice and this permission notice is present in all copies. The // full license for this software is available in the LICENSE file. #include namespace ircd::net { ctx::dock dock; void wait_close_sockets(); } void ircd::net::wait_close_sockets() { while(socket::instances) if(!dock.wait_for(seconds(2))) log::warning { log, "Waiting for %zu sockets to destruct", socket::instances }; } /////////////////////////////////////////////////////////////////////////////// // // init // /// Network subsystem initialization ircd::net::init::init() { sslv23_client.set_verify_mode(asio::ssl::verify_peer); sslv23_client.set_default_verify_paths(); } /// Network subsystem shutdown ircd::net::init::~init() noexcept { wait_close_sockets(); } /////////////////////////////////////////////////////////////////////////////// // // net/net.h // /// Network subsystem log facility with dedicated SNOMASK. struct ircd::log::log ircd::net::log { "net", 'N' }; ircd::string_view ircd::net::peer_cert_der_sha256_b64(const mutable_buffer &buf, const socket &socket) { thread_local char shabuf[sha256::digest_size]; const auto hash { peer_cert_der_sha256(shabuf, socket) }; return b64encode_unpadded(buf, hash); } ircd::const_buffer ircd::net::peer_cert_der_sha256(const mutable_buffer &buf, const socket &socket) { thread_local char derbuf[16384]; sha256 { buf, peer_cert_der(derbuf, socket) }; return { data(buf), sha256::digest_size }; } ircd::const_buffer ircd::net::peer_cert_der(const mutable_buffer &buf, const socket &socket) { const SSL &ssl(socket); const X509 &cert { openssl::peer_cert(ssl) }; return openssl::i2d(buf, cert); } std::pair ircd::net::calls(const socket &socket) noexcept { return { socket.in.calls, socket.out.calls }; } std::pair ircd::net::bytes(const socket &socket) noexcept { return { socket.in.bytes, socket.out.bytes }; } ircd::net::ipport ircd::net::remote_ipport(const socket &socket) noexcept try { const auto &ep(socket.remote()); return make_ipport(ep); } catch(...) { return {}; } ircd::net::ipport ircd::net::local_ipport(const socket &socket) noexcept try { const auto &ep(socket.local()); return make_ipport(ep); } catch(...) { return {}; } size_t ircd::net::available(const socket &socket) noexcept { const ip::tcp::socket &sd(socket); boost::system::error_code ec; return sd.available(ec); } size_t ircd::net::readable(const socket &socket) { ip::tcp::socket &sd(const_cast(socket)); ip::tcp::socket::bytes_readable command{true}; sd.io_control(command); return command.get(); } bool ircd::net::opened(const socket &socket) noexcept try { const ip::tcp::socket &sd(socket); return sd.is_open(); } catch(...) { return false; } const uint64_t & ircd::net::id(const socket &socket) { return socket.id; } /////////////////////////////////////////////////////////////////////////////// // // net/write.h // void ircd::net::flush(socket &socket) { if(nodelay(socket)) return; nodelay(socket, true); nodelay(socket, false); } /// Yields ircd::ctx until all buffers are sent. /// /// This is blocking behavior; use this if the following are true: /// /// * You put a timer on the socket so if the remote slows us down the data /// will not occupy the daemon's memory for a long time. Remember, *all* of /// the data will be sitting in memory even after some of it was ack'ed by /// the remote. /// /// * You are willing to dedicate the ircd::ctx to sending all the data to /// the remote. The ircd::ctx will be yielding until everything is sent. /// size_t ircd::net::write_all(socket &socket, const vector_view &buffers) { return socket.write_all(buffers); } /// Yields ircd::ctx until at least some buffers are sent. /// /// This is blocking behavior; use this if the following are true: /// /// * You put a timer on the socket so if the remote slows us down the data /// will not occupy the daemon's memory for a long time. /// /// * You are willing to dedicate the ircd::ctx to sending the data to /// the remote. The ircd::ctx will be yielding until the kernel has at least /// some space to consume at least something from the supplied buffers. /// size_t ircd::net::write_few(socket &socket, const vector_view &buffers) { return socket.write_few(buffers); } /// Writes as much as possible until one of the following is true: /// /// * The kernel buffer for the socket is full. /// * The user buffer is exhausted. /// /// This is non-blocking behavior. No yielding will take place; no timer is /// needed. Multiple syscalls will be composed to fulfill the above points. /// size_t ircd::net::write_any(socket &socket, const vector_view &buffers) { return socket.write_any(buffers); } /// Writes one "unit" of data or less; never more. The size of that unit /// is determined by the system. Less may be written if one of the following /// is true: /// /// * The kernel buffer for the socket is full. /// * The user buffer is exhausted. /// /// If neither are true, more can be written using additional calls; /// alternatively, use other variants of write_ for that. /// /// This is non-blocking behavior. No yielding will take place; no timer is /// needed. Only one syscall will occur. /// size_t ircd::net::write_one(socket &socket, const vector_view &buffers) { return socket.write_one(buffers); } /////////////////////////////////////////////////////////////////////////////// // // net/read.h // /// Yields ircd::ctx until len bytes have been received and discarded from the /// socket. /// size_t ircd::net::discard_all(socket &socket, const size_t &len) { static char buffer[512] alignas(16); size_t remain{len}; while(remain) { const mutable_buffer mb { buffer, std::min(remain, sizeof(buffer)) }; __builtin_prefetch(data(mb), 1, 0); // 1 = write, 0 = no cache remain -= read_all(socket, mb); } return len; } /// Non-blocking discard of up to len bytes. The amount of bytes discarded /// is returned. Zero is only returned if len==0 because the EAGAIN is /// thrown. If any bytes have been discarded any EAGAIN encountered in /// this function's internal loop is not thrown, but used to exit the loop. /// size_t ircd::net::discard_any(socket &socket, const size_t &len) { static char buffer[512] alignas(16); size_t remain{len}; while(remain) try { const mutable_buffer mb { buffer, std::min(remain, sizeof(buffer)) }; __builtin_prefetch(data(mb), 1, 0); // 1 = write, 0 = no cache remain -= read_one(socket, mb); } catch(const std::system_error &e) { if(e.code() == std::errc::resource_unavailable_try_again) if(remain <= len) break; throw; } return len - remain; } /// Yields ircd::ctx until buffers are full. /// /// Use this only if the following are true: /// /// * You know the remote has made a guarantee to send you a specific amount /// of data. /// /// * You put a timer on the socket so that if the remote runs short this /// call doesn't hang the ircd::ctx forever, otherwise it will until cancel. /// /// * You are willing to dedicate the ircd::ctx to just this operation for /// that amount of time. /// size_t ircd::net::read_all(socket &socket, const vector_view &buffers) { return socket.read_all(buffers); } /// Yields ircd::ctx until remote has sent at least one frame. The buffers may /// be filled with any amount of data depending on what has accumulated. /// /// Use this if the following are true: /// /// * You know there is data to be read; you can do this asynchronously with /// other features of the socket. Otherwise this will hang the ircd::ctx. /// /// * You are willing to dedicate the ircd::ctx to just this operation, /// which is non-blocking if data is known to be available, but may be /// blocking if this call is made in the blind. /// size_t ircd::net::read_few(socket &socket, const vector_view &buffers) { return socket.read_few(buffers); } /// Reads as much as possible. Non-blocking behavior. /// /// This is intended for lowest-level/custom control and not preferred by /// default for most users on an ircd::ctx. /// size_t ircd::net::read_any(socket &socket, const vector_view &buffers) { return socket.read_any(buffers); } /// Reads one message or less in a single syscall. Non-blocking behavior. /// /// This is intended for lowest-level/custom control and not preferred by /// default for most users on an ircd::ctx. /// size_t ircd::net::read_one(socket &socket, const vector_view &buffers) { return socket.read_one(buffers); } /////////////////////////////////////////////////////////////////////////////// // // net/wait.h // ircd::net::wait_opts const ircd::net::wait_opts_default; /// Wait for socket to become "ready" using a ctx::future. ircd::ctx::future ircd::net::wait(use_future_t, socket &socket, const wait_opts &wait_opts) { ctx::promise p; ctx::future f{p}; wait(socket, wait_opts, [p(std::move(p))] (std::exception_ptr eptr) mutable { if(eptr) p.set_exception(std::move(eptr)); else p.set_value(); }); return f; } /// Wait for socket to become "ready"; yields ircd::ctx returning code. std::error_code ircd::net::wait(nothrow_t, socket &socket, const wait_opts &wait_opts) try { wait(socket, wait_opts); return {}; } catch(const std::system_error &e) { return e.code(); } /// Wait for socket to become "ready"; yields ircd::ctx; throws errors. void ircd::net::wait(socket &socket, const wait_opts &wait_opts) { socket.wait(wait_opts); } /// Wait for socket to become "ready"; callback with exception_ptr void ircd::net::wait(socket &socket, const wait_opts &wait_opts, wait_callback_eptr callback) { socket.wait(wait_opts, std::move(callback)); } void ircd::net::wait(socket &socket, const wait_opts &wait_opts, wait_callback_ec callback) { socket.wait(wait_opts, std::move(callback)); } ircd::string_view ircd::net::reflect(const ready &type) { switch(type) { case ready::ANY: return "ANY"_sv; case ready::READ: return "READ"_sv; case ready::WRITE: return "WRITE"_sv; case ready::ERROR: return "ERROR"_sv; } return "????"_sv; } /////////////////////////////////////////////////////////////////////////////// // // net/close.h // decltype(ircd::net::close_opts::default_timeout) ircd::net::close_opts::default_timeout { { "name", "ircd.net.close.timeout" }, { "default", 7500L }, }; /// Static instance of default close options. ircd::net::close_opts const ircd::net::close_opts_default { }; /// Static helper callback which may be passed to the callback-based overload /// of close(). This callback does nothing. ircd::net::close_callback const ircd::net::close_ignore{[] (std::exception_ptr eptr) { return; }}; ircd::ctx::future ircd::net::close(socket &socket, const close_opts &opts) { ctx::promise p; ctx::future f(p); close(socket, opts, [p(std::move(p))] (std::exception_ptr eptr) mutable { if(eptr) p.set_exception(std::move(eptr)); else p.set_value(); }); return f; } void ircd::net::close(socket &socket, const close_opts &opts, close_callback callback) { socket.disconnect(opts, std::move(callback)); } /////////////////////////////////////////////////////////////////////////////// // // net/open.h // decltype(ircd::net::open_opts::default_connect_timeout) ircd::net::open_opts::default_connect_timeout { { "name", "ircd.net.open.connect_timeout" }, { "default", 7500L }, }; decltype(ircd::net::open_opts::default_handshake_timeout) ircd::net::open_opts::default_handshake_timeout { { "name", "ircd.net.open.handshake_timeout" }, { "default", 7500L }, }; decltype(ircd::net::open_opts::default_verify_certificate) ircd::net::open_opts::default_verify_certificate { { "name", "ircd.net.open.verify_certificate" }, { "default", true }, }; decltype(ircd::net::open_opts::default_allow_self_signed) ircd::net::open_opts::default_allow_self_signed { { "name", "ircd.net.open.allow_self_signed" }, { "default", false }, }; decltype(ircd::net::open_opts::default_allow_self_chain) ircd::net::open_opts::default_allow_self_chain { { "name", "ircd.net.open.allow_self_chain" }, { "default", false }, }; decltype(ircd::net::open_opts::default_allow_expired) ircd::net::open_opts::default_allow_expired { { "name", "ircd.net.open.allow_expired" }, { "default", false }, }; /// Open new socket with future-based report. /// ircd::ctx::future> ircd::net::open(const open_opts &opts) { ctx::promise> p; ctx::future> f(p); auto s{std::make_shared()}; open(*s, opts, [s, p(std::move(p))] (std::exception_ptr eptr) mutable { if(eptr) p.set_exception(std::move(eptr)); else p.set_value(s); }); return f; } /// Open existing socket with callback-based report. /// std::shared_ptr ircd::net::open(const open_opts &opts, open_callback handler) { auto s{std::make_shared()}; open(*s, opts, std::move(handler)); return s; } /// Open existing socket with callback-based report. /// void ircd::net::open(socket &socket, const open_opts &opts, open_callback handler) { auto complete{[s(shared_from(socket)), handler(std::move(handler))] (std::exception_ptr eptr) { if(eptr && !s->fini) close(*s, dc::RST); handler(std::move(eptr)); }}; auto connector{[&socket, opts, complete(std::move(complete))] (std::exception_ptr eptr, const hostport &hp, const ipport &ipport) { if(eptr) return complete(std::move(eptr)); const auto ep{make_endpoint(ipport)}; socket.connect(ep, opts, std::move(complete)); }}; if(!opts.ipport) dns::resolve(opts.hostport, std::move(connector)); else connector({}, opts.hostport, opts.ipport); } /////////////////////////////////////////////////////////////////////////////// // // net/sopts.h // /// Construct sock_opts with the current options from socket argument ircd::net::sock_opts::sock_opts(const socket &socket) :blocking{net::blocking(socket)} ,nodelay{net::nodelay(socket)} ,keepalive{net::keepalive(socket)} ,linger{net::linger(socket)} ,read_bufsz{ssize_t(net::read_bufsz(socket))} ,write_bufsz{ssize_t(net::write_bufsz(socket))} ,read_lowat{ssize_t(net::read_lowat(socket))} ,write_lowat{ssize_t(net::write_lowat(socket))} { } /// Updates the socket with provided options. Defaulted / -1'ed options are /// ignored for updating. void ircd::net::set(socket &socket, const sock_opts &opts) { if(opts.blocking != opts.IGN) net::blocking(socket, opts.blocking); if(opts.nodelay != opts.IGN) net::nodelay(socket, opts.nodelay); if(opts.keepalive != opts.IGN) net::keepalive(socket, opts.keepalive); if(opts.linger != opts.IGN) net::linger(socket, opts.linger); if(opts.read_bufsz != opts.IGN) net::read_bufsz(socket, opts.read_bufsz); if(opts.write_bufsz != opts.IGN) net::write_bufsz(socket, opts.write_bufsz); if(opts.read_lowat != opts.IGN) net::read_lowat(socket, opts.read_lowat); if(opts.write_lowat != opts.IGN) net::write_lowat(socket, opts.write_lowat); } void ircd::net::write_lowat(socket &socket, const size_t &bytes) { assert(bytes <= std::numeric_limits::max()); ip::tcp::socket::send_low_watermark option { int(bytes) }; ip::tcp::socket &sd(socket); sd.set_option(option); } void ircd::net::read_lowat(socket &socket, const size_t &bytes) { assert(bytes <= std::numeric_limits::max()); ip::tcp::socket::receive_low_watermark option { int(bytes) }; ip::tcp::socket &sd(socket); sd.set_option(option); } void ircd::net::write_bufsz(socket &socket, const size_t &bytes) { assert(bytes <= std::numeric_limits::max()); ip::tcp::socket::send_buffer_size option { int(bytes) }; ip::tcp::socket &sd(socket); sd.set_option(option); } void ircd::net::read_bufsz(socket &socket, const size_t &bytes) { assert(bytes <= std::numeric_limits::max()); ip::tcp::socket::receive_buffer_size option { int(bytes) }; ip::tcp::socket &sd(socket); sd.set_option(option); } void ircd::net::linger(socket &socket, const time_t &t) { assert(t >= std::numeric_limits::min()); assert(t <= std::numeric_limits::max()); ip::tcp::socket::linger option { t >= 0, // ON / OFF boolean t >= 0? int(t) : 0 // Uses 0 when OFF }; ip::tcp::socket &sd(socket); sd.set_option(option); } void ircd::net::keepalive(socket &socket, const bool &b) { ip::tcp::socket::keep_alive option{b}; ip::tcp::socket &sd(socket); sd.set_option(option); } void ircd::net::nodelay(socket &socket, const bool &b) { ip::tcp::no_delay option{b}; ip::tcp::socket &sd(socket); sd.set_option(option); } /// Toggles the behavior of non-async asio calls. /// /// This option affects very little in practice and only sets a flag in /// userspace in asio, not an actual ioctl(). Specifically: /// /// * All sockets are already set by asio to FIONBIO=1 no matter what, thus /// nothing really blocks the event loop ever by default unless you try hard. /// /// * All asio::async_ and sd.async_ and ssl.async_ calls will always do what /// the synchronous/blocking alternative would have accomplished but using /// the async methodology. i.e if a buffer is full you will always wait /// asynchronously: async_write() will wait for everything, async_write_some() /// will wait for something, etc -- but there will never be true non-blocking /// _effective behavior_ from these calls. /// /// * All asio non-async calls conduct blocking by (on linux) poll()'ing the /// socket to get a real kernel-blocking operation out of it (this is the /// try-hard part). /// /// This flag only controls the behavior of the last bullet. In practice, /// in this project there is never a reason to ever set this to true, /// however, sockets do get constructed by asio in blocking mode by default /// so we mostly use this function to set it to non-blocking. /// void ircd::net::blocking(socket &socket, const bool &b) { ip::tcp::socket &sd(socket); sd.non_blocking(!b); } size_t ircd::net::write_lowat(const socket &socket) { const ip::tcp::socket &sd(socket); ip::tcp::socket::send_low_watermark option{}; sd.get_option(option); return option.value(); } size_t ircd::net::read_lowat(const socket &socket) { const ip::tcp::socket &sd(socket); ip::tcp::socket::receive_low_watermark option{}; sd.get_option(option); return option.value(); } size_t ircd::net::write_bufsz(const socket &socket) { const ip::tcp::socket &sd(socket); ip::tcp::socket::send_buffer_size option{}; sd.get_option(option); return option.value(); } size_t ircd::net::read_bufsz(const socket &socket) { const ip::tcp::socket &sd(socket); ip::tcp::socket::receive_buffer_size option{}; sd.get_option(option); return option.value(); } time_t ircd::net::linger(const socket &socket) { const ip::tcp::socket &sd(socket); ip::tcp::socket::linger option; sd.get_option(option); return option.enabled()? option.timeout() : -1; } bool ircd::net::keepalive(const socket &socket) { const ip::tcp::socket &sd(socket); ip::tcp::socket::keep_alive option; sd.get_option(option); return option.value(); } bool ircd::net::nodelay(const socket &socket) { const ip::tcp::socket &sd(socket); ip::tcp::no_delay option; sd.get_option(option); return option.value(); } bool ircd::net::blocking(const socket &socket) { const ip::tcp::socket &sd(socket); return !sd.non_blocking(); } /////////////////////////////////////////////////////////////////////////////// // // net/listener.h // /// Option to indicate if any listener sockets should be allowed to bind. If /// false then no listeners should bind. This is only effective on startup /// unless a conf item updated function is implemented here. decltype(ircd::net::listen) ircd::net::listen { { "name", "ircd.net.listen" }, { "default", true }, { "persist", false }, }; // // listener // std::ostream & ircd::net::operator<<(std::ostream &s, const listener &a) { s << *a.acceptor; return s; } // // listener::listener // ircd::net::listener::listener(const string_view &name, const std::string &opts, callback cb, proffer pcb) :listener { name, json::object{opts}, std::move(cb), std::move(pcb) } { } ircd::net::listener::listener(const string_view &name, const json::object &opts, callback cb, proffer pcb) :acceptor { std::make_shared(name, opts, std::move(cb), std::move(pcb)) } { // Starts the first asynchronous accept. This has to be done out here after // the acceptor's shared object is constructed. acceptor->next(); } /// Cancels all pending accepts and handshakes and waits (yields ircd::ctx) /// until report. /// ircd::net::listener::~listener() noexcept { if(acceptor) acceptor->join(); } ircd::string_view ircd::net::listener::name() const { assert(acceptor); return acceptor->name; } ircd::net::listener::operator ircd::json::object() const { assert(acceptor); return acceptor->opts; } // // listener_udp // std::ostream & ircd::net::operator<<(std::ostream &s, const listener_udp &a) { s << *a.acceptor; return s; } // // listener_udp::listener_udp // ircd::net::listener_udp::listener_udp(const string_view &name, const std::string &opts) :listener_udp { name, json::object{opts} } { } ircd::net::listener_udp::listener_udp(const string_view &name, const json::object &opts) :acceptor { std::make_unique(name, opts) } { } ircd::net::listener_udp::~listener_udp() noexcept { if(acceptor) acceptor->join(); } ircd::net::listener_udp::datagram & ircd::net::listener_udp::operator()(datagram &datagram) { assert(acceptor); return acceptor->operator()(datagram); } ircd::string_view ircd::net::listener_udp::name() const { assert(acceptor); return acceptor->name; } ircd::net::listener_udp::operator ircd::json::object() const { assert(acceptor); return acceptor->opts; } /////////////////////////////////////////////////////////////////////////////// // // net/acceptor.h // namespace ircd::net { thread_local char logheadbuf[512]; } // // listener::acceptor // decltype(ircd::net::listener::acceptor::log) ircd::net::listener::acceptor::log { "listener" }; decltype(ircd::net::listener::acceptor::timeout) ircd::net::listener::acceptor::timeout { { "name", "ircd.net.acceptor.timeout" }, { "default", 12000L }, }; std::ostream & ircd::net::operator<<(std::ostream &s, const struct listener::acceptor &a) { thread_local char addrbuf[128]; s << "'" << a.name << "' @ [" << string(addrbuf, a.ep.address()) << "]:" << a.ep.port(); return s; } // // listener::acceptor::acceptor // ircd::net::listener::acceptor::acceptor(const string_view &name, const json::object &opts, listener::callback cb, listener::proffer pcb) try :name { name } ,opts { opts } ,backlog { //TODO: XXX //boost::asio::ip::tcp::socket::max_connections <-- linkage failed? std::min(opts.get("backlog", SOMAXCONN), uint(SOMAXCONN)) } ,cb { std::move(cb) } ,pcb { std::move(pcb) } ,ssl { asio::ssl::context::method::sslv23_server } ,ep { ip::address::from_string(unquote(opts.get("host", "0.0.0.0"s))), opts.get("port", 8448L) } ,a { ios::get() } { static const auto &max_connections { //TODO: XXX //boost::asio::ip::tcp::socket::max_connections <-- linkage failed? std::min(opts.get("max_connections", SOMAXCONN), uint(SOMAXCONN)) }; static const ip::tcp::acceptor::reuse_address reuse_address { true }; configure(opts); log::debug { log, "%s configured listener SSL", string(logheadbuf, *this) }; a.open(ep.protocol()); a.set_option(reuse_address); log::debug { log, "%s opened listener socket", string(logheadbuf, *this) }; a.bind(ep); log::debug { log, "%s bound listener socket", string(logheadbuf, *this) }; a.listen(backlog); log::debug { log, "%s listening (backlog: %lu, max connections: %zu)", string(logheadbuf, *this), backlog, max_connections }; } catch(const boost::system::system_error &e) { throw_system_error(e); } ircd::net::listener::acceptor::~acceptor() noexcept { } void ircd::net::listener::acceptor::join() noexcept try { interrupt(); joining.wait([this] { return !accepting && !handshaking; }); } catch(const std::exception &e) { log::error { log, "acceptor(%p) join: %s", this, e.what() }; } bool ircd::net::listener::acceptor::interrupt() noexcept try { interrupting = true; a.cancel(); return true; } catch(const boost::system::system_error &e) { log::error { log, "acceptor(%p) interrupt: %s", this, string(e) }; return false; } /// Sets the next asynchronous handler to start the next accept sequence. /// Each call to next() sets one handler which handles the connect for one /// socket. After the connect, an asynchronous SSL handshake handler is set /// for the socket, and next() is called again to setup for the next socket /// too. void ircd::net::listener::acceptor::next() try { auto sock(std::make_shared(ssl)); /* log::debug { log, "%s: socket(%p) is the next socket to accept", string(logheadbuf, *this), sock.get() }; */ ++accepting; ip::tcp::socket &sd(*sock); a.async_accept(sd, std::bind(&acceptor::accept, this, ph::_1, sock, weak_from(*this))); } catch(const std::exception &e) { throw assertive { "%s: %s", string(logheadbuf, *this), e.what() }; } /// Callback for a socket connected. This handler then invokes the /// asynchronous SSL handshake sequence. /// void ircd::net::listener::acceptor::accept(const error_code &ec, const std::shared_ptr sock, const std::weak_ptr a) noexcept try { if(unlikely(a.expired())) return; --accepting; const unwind::exceptional drop{[&sock] { if(!bool(sock)) return; error_code ec; sock->sd.close(ec); }}; assert(bool(sock)); log::debug { log, "%s: socket(%p) accepted(%zu) %s %s", string(logheadbuf, *this), sock.get(), accepting, string(remote_ipport(*sock)), string(ec) }; if(!check_accept_error(ec, *sock)) return; // Call the proffer-callback if available. This allows the application // to check whether to allow or deny this remote before the handshake. if(pcb && !pcb(remote_ipport(*sock))) { net::close(*sock, dc::RST, close_ignore); return; } // Toggles the behavior of non-async functions; see func comment blocking(*sock, false); static const socket::handshake_type handshake_type { socket::handshake_type::server }; auto handshake { std::bind(&acceptor::handshake, this, ph::_1, sock, a) }; ++handshaking; sock->set_timeout(milliseconds(timeout)); sock->ssl.async_handshake(handshake_type, std::move(handshake)); } catch(const ctx::interrupted &e) { log::debug { log, "%s: acceptor interrupted socket(%p) %s", string(logheadbuf, *this), sock.get(), string(ec) }; joining.notify_all(); } catch(const std::system_error &e) { log::derror { log, "%s: socket(%p) in accept(): %s", string(logheadbuf, *this), sock.get(), string(e) }; } catch(const std::exception &e) { log::error { log, "%s: socket(%p) in accept(): %s", string(logheadbuf, *this), sock.get(), e.what() }; } /// Error handler for the accept socket callback. This handler determines /// whether or not the handler should return or continue processing the /// result. /// bool ircd::net::listener::acceptor::check_accept_error(const error_code &ec, socket &sock) { using std::errc; if(unlikely(interrupting)) throw ctx::interrupted(); if(likely(!ec)) { this->next(); return true; } if(system_category(ec)) switch(ec.value()) { case int(errc::operation_canceled): return false; default: break; } throw_system_error(ec); } void ircd::net::listener::acceptor::handshake(const error_code &ec, const std::shared_ptr sock, const std::weak_ptr a) noexcept try { if(unlikely(a.expired())) return; --handshaking; const unwind::exceptional drop{[&sock] { if(bool(sock)) close(*sock, dc::RST, close_ignore); }}; assert(bool(sock)); log::debug { log, "socket(%p) local[%s] remote[%s] handshook(%zu) %s", sock.get(), string(local_ipport(*sock)), string(remote_ipport(*sock)), handshaking, string(ec) }; check_handshake_error(ec, *sock); sock->cancel_timeout(); assert(bool(cb)); cb(sock); } catch(const ctx::interrupted &e) { log::debug { log, "%s: SSL handshake interrupted socket(%p) %s", string(logheadbuf, *this), sock.get(), string(ec) }; joining.notify_all(); } catch(const std::system_error &e) { log::derror { log, "%s: socket(%p) in handshake(): %s", string(logheadbuf, *this), sock.get(), string(e) }; } catch(const std::exception &e) { log::error { log, "%s: socket(%p) in handshake(): %s", string(logheadbuf, *this), sock.get(), e.what() }; } /// Error handler for the SSL handshake callback. This handler determines /// whether or not the handler should return or continue processing the /// result. /// void ircd::net::listener::acceptor::check_handshake_error(const error_code &ec, socket &sock) { using std::errc; if(unlikely(interrupting)) throw ctx::interrupted(); if(likely(system_category(ec))) switch(ec.value()) { case 0: return; case int(errc::operation_canceled): if(sock.timedout) throw_system_error(errc::timed_out); else break; default: break; } throw_system_error(ec); } void ircd::net::listener::acceptor::configure(const json::object &opts) { log::debug { log, "%s preparing listener socket configuration...", string(logheadbuf, *this) }; ssl.set_options ( 0 //| ssl.default_workarounds //| ssl.no_tlsv1 //| ssl.no_tlsv1_1 //| ssl.no_tlsv1_2 //| ssl.no_sslv2 //| ssl.no_sslv3 //| ssl.single_dh_use ); //TODO: XXX ssl.set_password_callback([this] (const auto &size, const auto &purpose) { log::notice { log, "%s asking for password with purpose '%s' (size: %zu)", string(logheadbuf, *this), purpose, size }; //XXX: TODO assert(0); return "foobar"; }); if(opts.has("certificate_chain_path")) { const std::string filename { unquote(opts["certificate_chain_path"]) }; if(!fs::exists(filename)) throw error { "%s: SSL certificate chain file @ `%s' not found", string(logheadbuf, *this), filename }; ssl.use_certificate_chain_file(filename); log::info { log, "%s using certificate chain file '%s'", string(logheadbuf, *this), filename }; } if(opts.has("certificate_pem_path")) { const std::string filename { unquote(opts.get("certificate_pem_path", name + ".crt")) }; if(!fs::exists(filename)) throw error { "%s: SSL certificate pem file @ `%s' not found", string(logheadbuf, *this), filename }; ssl.use_certificate_file(filename, asio::ssl::context::pem); log::info { log, "%s using certificate file '%s'", string(logheadbuf, *this), filename }; } if(opts.has("private_key_pem_path")) { const std::string filename { unquote(opts.get("private_key_pem_path", name + ".crt.key")) }; if(!fs::exists(filename)) throw error { "%s: SSL private key file @ `%s' not found", string(logheadbuf, *this), filename }; ssl.use_private_key_file(filename, asio::ssl::context::pem); log::info { log, "%s using private key file '%s'", string(logheadbuf, *this), filename }; } if(opts.has("tmp_dh_path") && !empty(unquote(opts.at("tmp_dh_path")))) { const std::string filename { unquote(opts.at("tmp_dh_path")) }; if(!fs::exists(filename)) throw error { "%s: SSL tmp dh file @ `%s' not found", string(logheadbuf, *this), filename }; ssl.use_tmp_dh_file(filename); log::info { log, "%s using tmp dh file '%s'", string(logheadbuf, *this), filename }; } else if(opts.has("tmp_dh")) { const const_buffer buf { unquote(opts.at("tmp_dh")) }; ssl.use_tmp_dh(buf); log::info { log, "%s using DH params supplied in options (%zu bytes)", string(logheadbuf, *this), size(buf) }; } else { const const_buffer &buf { openssl::rfc3526_dh_params_pem }; ssl.use_tmp_dh(buf); log::info { log, "%s using pre-supplied rfc3526 DH parameters.", string(logheadbuf, *this) }; } } // // listener_udp::acceptor // std::ostream & ircd::net::operator<<(std::ostream &s, const struct listener_udp::acceptor &a) { s << "'" << a.name << "' @ [" << string(a.ep.address()) << "]:" << a.ep.port(); return s; } // // listener_udp::acceptor::acceptor // ircd::net::listener_udp::acceptor::acceptor(const string_view &name, const json::object &opts) try :name { name } ,opts { opts } ,ep { ip::address::from_string(unquote(opts.get("host", "0.0.0.0"s))), opts.get("port", 8448L) } ,a { ios::get() } { static const ip::udp::socket::reuse_address reuse_address { true }; a.open(ep.protocol()); a.set_option(reuse_address); log::debug { log, "%s opened listener socket", string(logheadbuf, *this) }; a.bind(ep); log::debug { log, "%s bound listener socket", string(logheadbuf, *this) }; } catch(const boost::system::system_error &e) { throw_system_error(e); } ircd::net::listener_udp::acceptor::~acceptor() noexcept { } void ircd::net::listener_udp::acceptor::join() noexcept try { interrupt(); joining.wait([this] { return waiting == 0; }); } catch(const std::exception &e) { log::error { log, "acceptor(%p) join: %s", this, e.what() }; } bool ircd::net::listener_udp::acceptor::interrupt() noexcept try { a.cancel(); return true; } catch(const boost::system::system_error &e) { log::error { log, "acceptor(%p) interrupt: %s", this, string(e) }; return false; } ircd::net::listener_udp::datagram & ircd::net::listener_udp::acceptor::operator()(datagram &datagram) { assert(ctx::current); const auto flags { this->flags(datagram.flag) }; const auto interruption{[this] (ctx::ctx *const &) noexcept { this->interrupt(); }}; this->waiting++; const unwind dec{[this] { this->waiting--; }}; ip::udp::endpoint ep; const size_t rlen { a.async_receive_from(datagram.mbufs, ep, flags, yield_context{to_asio{interruption}}) }; datagram.remote = make_ipport(ep); datagram.mbuf = {data(datagram.mbuf), rlen}; return datagram; } boost::asio::ip::udp::socket::message_flags ircd::net::listener_udp::acceptor::flags(const flag &flag) { ip::udp::socket::message_flags ret{0}; if(flag & flag::PEEK) ret |= ip::udp::socket::message_peek; return ret; } // // listener_udp::datagram // ircd::net::listener_udp::datagram::datagram(const const_buffer &buf, const ipport &remote, const enum flag &flag) :cbuf{buf} ,cbufs{&cbuf, 1} ,remote{remote} ,flag{flag} {} ircd::net::listener_udp::datagram::datagram(const mutable_buffer &buf, const enum flag &flag) :mbuf{buf} ,mbufs{&mbuf, 1} ,flag{flag} {} /////////////////////////////////////////////////////////////////////////////// // // net/scope_timeout.h // ircd::net::scope_timeout::scope_timeout(socket &socket, const milliseconds &timeout) :s { timeout < 0ms? nullptr : &socket } { if(timeout < 0ms) return; socket.set_timeout(timeout); } ircd::net::scope_timeout::scope_timeout(socket &socket, const milliseconds &timeout, handler callback) :s { timeout < 0ms? nullptr : &socket } { if(timeout < 0ms) return; socket.set_timeout(timeout, [callback(std::move(callback))] (const error_code &ec) { const bool &timed_out{!ec}; // success = timeout callback(timed_out); }); } ircd::net::scope_timeout::scope_timeout(scope_timeout &&other) noexcept :s{std::move(other.s)} { other.s = nullptr; } ircd::net::scope_timeout & ircd::net::scope_timeout::operator=(scope_timeout &&other) noexcept { this->~scope_timeout(); s = std::move(other.s); return *this; } ircd::net::scope_timeout::~scope_timeout() noexcept { cancel(); } bool ircd::net::scope_timeout::cancel() noexcept try { if(!this->s) return false; auto *const s{this->s}; this->s = nullptr; s->cancel_timeout(); return true; } catch(const std::exception &e) { log::error { log, "socket(%p) scope_timeout::cancel: %s", (const void *)s, e.what() }; return false; } bool ircd::net::scope_timeout::release() { const auto s{this->s}; this->s = nullptr; return s != nullptr; } /////////////////////////////////////////////////////////////////////////////// // // net/socket.h // boost::asio::ssl::context ircd::net::sslv23_client { boost::asio::ssl::context::method::sslv23_client }; decltype(ircd::net::socket::count) ircd::net::socket::count {}; decltype(ircd::net::socket::instances) ircd::net::socket::instances {}; // // socket // ircd::net::socket::socket(asio::ssl::context &ssl, boost::asio::io_service &ios) :sd { ios } ,ssl { this->sd, ssl } ,timer { ios } { ++instances; } /// The dtor asserts that the socket is not open/connected requiring a /// an SSL close_notify. There's no more room for async callbacks via /// shared_ptr after this dtor. ircd::net::socket::~socket() noexcept try { assert(instances > 0); if(unlikely(--instances == 0)) net::dock.notify_all(); if(unlikely(RB_DEBUG_LEVEL && opened(*this))) throw assertive { "Failed to ensure socket(%p) is disconnected from %s before dtor.", this, string(remote()) }; } catch(const std::exception &e) { log::critical { log, "socket(%p) close: %s", this, e.what() }; return; } void ircd::net::socket::connect(const endpoint &ep, const open_opts &opts, eptr_handler callback) { log::debug { log, "socket(%p) attempting connect remote[%s] to:%ld$ms", this, string(ep), opts.connect_timeout.count() }; auto connect_handler { std::bind(&socket::handle_connect, this, weak_from(*this), opts, std::move(callback), ph::_1) }; set_timeout(opts.connect_timeout); sd.async_connect(ep, std::move(connect_handler)); } void ircd::net::socket::handshake(const open_opts &opts, eptr_handler callback) { log::debug { log, "socket(%p) local[%s] remote[%s] handshaking for '%s' to:%ld$ms", this, string(local_ipport(*this)), string(remote_ipport(*this)), common_name(opts), opts.handshake_timeout.count() }; auto handshake_handler { std::bind(&socket::handle_handshake, this, weak_from(*this), std::move(callback), ph::_1) }; auto verify_handler { std::bind(&socket::handle_verify, this, ph::_1, ph::_2, opts) }; set_timeout(opts.handshake_timeout); ssl.set_verify_callback(std::move(verify_handler)); ssl.async_handshake(handshake_type::client, std::move(handshake_handler)); } void ircd::net::socket::disconnect(const close_opts &opts, eptr_handler callback) try { if(!sd.is_open()) { call_user(callback, {}); return; } log::debug { log, "socket(%p) local[%s] remote[%s] disconnect type:%d user: in:%zu out:%zu", (const void *)this, string(local_ipport(*this)), string(remote_ipport(*this)), uint(opts.type), in.bytes, out.bytes }; assert(!fini); fini = true; cancel(); if(opts.sopts) set(*this, *opts.sopts); switch(opts.type) { case dc::RST: sd.close(); break; case dc::FIN: sd.shutdown(ip::tcp::socket::shutdown_both); break; case dc::FIN_SEND: sd.shutdown(ip::tcp::socket::shutdown_send); break; case dc::FIN_RECV: sd.shutdown(ip::tcp::socket::shutdown_receive); break; case dc::SSL_NOTIFY: { auto disconnect_handler { std::bind(&socket::handle_disconnect, this, shared_from(*this), std::move(callback), ph::_1) }; set_timeout(opts.timeout); ssl.async_shutdown(std::move(disconnect_handler)); return; } } call_user(callback, {}); } catch(const boost::system::system_error &e) { log::derror { log, "socket(%p) disconnect type:%d :%s", (const void *)this, uint(opts.type), e.what() }; call_user(callback, make_error_code(e)); } catch(const std::exception &e) { throw assertive { "socket(%p) disconnect: type: %d: %s", (const void *)this, uint(opts.type), e.what() }; } void ircd::net::socket::cancel() noexcept { cancel_timeout(); boost::system::error_code ec; sd.cancel(ec); if(likely(!ec)) return; log::dwarning { log, "socket(%p) cancel :%s", (const void *)this, string(ec) }; } void ircd::net::socket::wait(const wait_opts &opts, wait_callback_eptr callback) { wait(opts, [callback(std::move(callback))] (const error_code &ec) { if(likely(!ec)) return callback(std::exception_ptr{}); callback(make_system_eptr(ec)); }); } /// Asynchronous callback when the socket is ready /// /// Overload for operator() without a timeout. see: operator() /// void ircd::net::socket::wait(const wait_opts &opts) try { const auto interruption{[this] (ctx::ctx *const &) noexcept { this->cancel(); }}; const scope_timeout timeout { *this, opts.timeout }; switch(opts.type) { case ready::ERROR: sd.async_wait(wait_type::wait_error, yield_context{to_asio{interruption}}); break; case ready::WRITE: sd.async_wait(wait_type::wait_write, yield_context{to_asio{interruption}}); break; case ready::READ: sd.async_wait(wait_type::wait_read, yield_context{to_asio{interruption}}); break; default: throw ircd::not_implemented{}; } } catch(const boost::system::system_error &e) { if(e.code() == boost::system::errc::operation_canceled && timedout) throw_system_error(std::errc::timed_out); throw_system_error(e); } /// Asynchronous callback when the socket is ready /// /// This function calls back the handler when the socket is ready /// for the operation of the specified type. /// void ircd::net::socket::wait(const wait_opts &opts, wait_callback_ec callback) try { set_timeout(opts.timeout); const unwind::exceptional unset{[this] { cancel_timeout(); }}; switch(opts.type) { case ready::ERROR: { auto handle { std::bind(&socket::handle_ready, this, weak_from(*this), opts.type, std::move(callback), ph::_1, 0UL) }; sd.async_wait(wait_type::wait_error, std::move(handle)); break; } case ready::WRITE: { auto handle { std::bind(&socket::handle_ready, this, weak_from(*this), opts.type, std::move(callback), ph::_1, 0UL) }; sd.async_wait(wait_type::wait_write, std::move(handle)); break; } case ready::READ: { static char buf[1] alignas(16); static const ilist bufs{buf}; __builtin_prefetch(buf, 1, 0); // 1 = write, 0 = no cache auto handle { std::bind(&socket::handle_ready, this, weak_from(*this), opts.type, std::move(callback), ph::_1, ph::_2) }; // The problem here is that waiting on the sd doesn't account for bytes // read into SSL that we didn't consume yet. If something is stuck in // those userspace buffers, the socket won't know about it and perform // the wait. ASIO should fix this by adding a ssl::stream.wait() method // which will bail out immediately in this case before passing up to the // real socket wait. if(SSL_peek(ssl.native_handle(), buf, sizeof(buf)) >= ssize_t(sizeof(buf))) { ircd::post([handle(std::move(handle))] { handle(error_code{}, 1UL); }); break; } // The problem here is that the wait operation gives ec=success on both a // socket error and when data is actually available. We then have to check // using a non-blocking peek in the handler. By doing it this way here we // just get the error in the handler's ec. sd.async_receive(bufs, sd.message_peek, std::move(handle)); //sd.async_wait(wait_type::wait_read, std::move(handle)); break; } default: throw ircd::not_implemented{}; } } catch(const boost::system::system_error &e) { throw_system_error(e); } void ircd::net::socket::handle_ready(const std::weak_ptr wp, const net::ready type, const ec_handler callback, error_code ec, const size_t bytes) noexcept try { using std::errc; // After life_guard is constructed it is safe to use *this in this frame. const life_guard s{wp}; if(!timedout && !is(ec, errc::operation_canceled) && !fini) cancel_timeout(); if(timedout && is(ec, errc::operation_canceled)) ec = make_error_code(errc::timed_out); if(unlikely(!ec && !sd.is_open())) ec = make_error_code(errc::bad_file_descriptor); if(type == ready::READ && !ec && bytes == 0) ec = error_code{asio::error::eof, asio::error::get_misc_category()}; log::debug { log, "socket(%p) local[%s] remote[%s] ready %s %s avail:%zu:%zu:%d", this, string(local_ipport(*this)), string(remote_ipport(*this)), reflect(type), string(ec), type == ready::READ? bytes : 0UL, type == ready::READ? available(*this) : 0UL, SSL_pending(ssl.native_handle()) }; call_user(callback, ec); } catch(const std::bad_weak_ptr &e) { // This handler may still be registered with asio after the socket destructs, so // the weak_ptr will indicate that fact. However, this is never intended and is // a debug assertion which should be corrected. log::warning { log, "socket(%p) belated callback to handler... (%s)", this, e.what() }; assert(0); } catch(const std::exception &e) { log::critical { log, "socket(%p) handle: %s", this, e.what() }; assert(0); call_user(callback, ec); } void ircd::net::socket::handle_timeout(const std::weak_ptr wp, ec_handler callback, error_code ec) noexcept try { if(unlikely(wp.expired())) return; // We increment our end of the timer semaphore. If the count is still // behind the other end of the semaphore, this callback was sitting in // the ios queue while the timer was given a new task; any effects here // will be erroneously bleeding into the next timeout. However the callback // is still invoked to satisfy the user's expectation for receiving it. assert(timer_sem[0] < timer_sem[1]); if(++timer_sem[0] == timer_sem[1] && timer_set) switch(ec.value()) { // A 'success' for this handler means there was a timeout on the socket case 0: { assert(timedout == false); timedout = true; sd.cancel(); break; } // A cancelation means there was no timeout. case int(std::errc::operation_canceled): { assert(ec.category() == std::system_category()); assert(timedout == false); break; } // All other errors are unexpected, logged and ignored here. default: throw assertive { "socket(%p): unexpected: %s\n", (const void *)this, string(ec) }; } else ec = make_error_code(std::errc::operation_canceled); if(callback) call_user(callback, ec); } catch(const boost::system::system_error &e) { using std::errc; const auto &ec_(e.code()); if(system_category(ec_)) switch(ec_.value()) { case int(errc::bad_file_descriptor): { if(fini) break; //[[fallthrough]]; } default: { assert(0); log::critical { log, "socket(%p) handle timeout: %s", (const void *)this, string(e) }; break; } } if(callback) call_user(callback, ec_); } catch(const std::exception &e) { log::critical { log, "socket(%p) handle timeout: %s", (const void *)this, e.what() }; assert(0); if(callback) call_user(callback, ec); } void ircd::net::socket::handle_connect(std::weak_ptr wp, const open_opts opts, eptr_handler callback, error_code ec) noexcept try { using std::errc; const life_guard s{wp}; log::debug { log, "socket(%p) local[%s] remote[%s] connect %s", this, string(local_ipport(*this)), string(remote_ipport(*this)), string(ec) }; // The timer was set by socket::connect() and may need to be canceled. if(!timedout && !is(ec, errc::operation_canceled) && !fini) cancel_timeout(); if(timedout && is(ec, errc::operation_canceled)) ec = make_error_code(errc::timed_out); // A connect error; abort here by calling the user back with error. if(ec) return call_user(callback, ec); // Toggles the behavior of non-async functions; see func comment blocking(*this, false); // Try to set the user's socket options now; if something fails we can // invoke their callback with the error from the exception handler. if(opts.sopts) set(*this, *opts.sopts); // The user can opt out of performing the handshake here. if(!opts.handshake) return call_user(callback, ec); handshake(opts, std::move(callback)); } catch(const std::bad_weak_ptr &e) { log::warning { log, "socket(%p) belated callback to handle_connect... (%s)", this, e.what() }; assert(0); } catch(const std::exception &e) { log::critical { log, "socket(%p) handle_connect: %s", this, e.what() }; assert(0); call_user(callback, ec); } void ircd::net::socket::handle_disconnect(std::shared_ptr s, eptr_handler callback, error_code ec) noexcept try { using std::errc; assert(fini); if(!timedout && ec != errc::operation_canceled) cancel_timeout(); if(timedout && ec == errc::operation_canceled) ec = make_error_code(errc::timed_out); log::debug { log, "socket(%p) local[%s] remote[%s] disconnect %s", this, string(local_ipport(*this)), string(remote_ipport(*this)), string(ec) }; // This ignores EOF and turns it into a success to alleviate user concern. if(ec.category() == asio::error::get_misc_category()) if(ec.value() == asio::error::eof) ec = error_code{}; sd.close(); call_user(callback, ec); } catch(const boost::system::system_error &e) { log::error { log, "socket(%p) disconnect: %s", this, e.what() }; assert(0); call_user(callback, e.code()); } catch(const std::exception &e) { log::critical { log, "socket(%p) disconnect: %s", this, e.what() }; assert(0); call_user(callback, ec); } void ircd::net::socket::handle_handshake(std::weak_ptr wp, eptr_handler callback, error_code ec) noexcept try { using std::errc; const life_guard s{wp}; if(!timedout && ec != errc::operation_canceled && !fini) cancel_timeout(); if(timedout && ec == errc::operation_canceled) ec = make_error_code(errc::timed_out); log::debug { log, "socket(%p) local[%s] remote[%s] handshake %s", this, string(local_ipport(*this)), string(remote_ipport(*this)), string(ec) }; // This is the end of the asynchronous call chain; the user is called // back with or without error here. call_user(callback, ec); } catch(const boost::system::system_error &e) { log::error { log, "socket(%p) after handshake: %s", this, e.what() }; assert(0); call_user(callback, e.code()); } catch(const std::bad_weak_ptr &e) { log::warning { log, "socket(%p) belated callback to handle_handshake... (%s)", this, e.what() }; assert(0); } catch(const std::exception &e) { log::critical { log, "socket(%p) handle_handshake: %s", this, e.what() }; assert(0); call_user(callback, ec); } bool ircd::net::socket::handle_verify(const bool valid, asio::ssl::verify_context &vc, const open_opts &opts) noexcept try { // `valid` indicates whether or not there's an anomaly with the // certificate; if so, it is usually enumerated by the `switch()` // statement below. If `valid` is false, this function can return // true to continue but it appears this function will be called a // second time with `valid=true`. // // TODO: XXX: This behavior must be confirmed since we return true // TODO: XXX: early on recoverable errors and skip other checks // TODO: XXX: expecting a second call.. // // The user can set this option to bypass verification. if(!opts.verify_certificate) return true; // X509_STORE_CTX & assert(vc.native_handle()); const auto &stctx{*vc.native_handle()}; const auto &cert{openssl::current_cert(stctx)}; const auto reject{[&stctx, &opts] { throw inauthentic { "%s #%ld: %s", common_name(opts), openssl::get_error(stctx), openssl::get_error_string(stctx) }; }}; if(!valid) { thread_local char buf[4_KiB]; const critical_assertion ca; log::warning { log, "verify[%s]: %s :%s", common_name(opts), openssl::get_error_string(stctx), openssl::print_subject(buf, cert) }; } const auto err { openssl::get_error(stctx) }; if(!valid) switch(err) { case X509_V_OK: assert(0); default: reject(); break; case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: assert(openssl::get_error_depth(stctx) == 0); if(opts.allow_self_signed) return true; reject(); break; case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: if(opts.allow_self_chain) return true; reject(); break; case X509_V_ERR_CERT_HAS_EXPIRED: if(opts.allow_expired) return true; reject(); break; } const bool verify_common_name { opts.verify_common_name && (opts.verify_self_signed_common_name && err == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT) }; if(verify_common_name) { if(unlikely(empty(common_name(opts)))) throw inauthentic { "No common name specified in connection options" }; //TODO: this object makes an std::string boost::asio::ssl::rfc2818_verification verifier { std::string(common_name(opts)) }; if(!verifier(true, vc)) { thread_local char buf[rfc1035::NAME_BUF_SIZE]; const critical_assertion ca; throw inauthentic { "/CN=%s does not match target host %s :%s", openssl::subject_common_name(buf, cert), common_name(opts), openssl::get_error_string(stctx) }; } } { thread_local char buf[4_KiB]; const critical_assertion ca; log::debug { log, "verify[%s]: %s", common_name(opts), openssl::print_subject(buf, cert) }; } return true; } catch(const inauthentic &e) { log::error { log, "Certificate rejected: %s", e.what() }; return false; } catch(const std::exception &e) { log::critical { log, "Certificate error: %s", e.what() }; return false; } void ircd::net::socket::call_user(const ec_handler &callback, const error_code &ec) noexcept try { callback(ec); } catch(const std::exception &e) { log::critical { log, "socket(%p) async handler: unhandled exception: %s", this, e.what() }; close(*this, dc::RST, close_ignore); } void ircd::net::socket::call_user(const eptr_handler &callback, const error_code &ec) noexcept try { if(likely(!ec)) return callback(std::exception_ptr{}); callback(make_system_eptr(ec)); } catch(const std::exception &e) { log::critical { log, "socket(%p) async handler: unhandled exception: %s", this, e.what() }; } ircd::milliseconds ircd::net::socket::cancel_timeout() noexcept { const auto exp { timer.expires_from_now() }; const auto ret { duration_cast(exp) }; timer_set = false; timedout = false; boost::system::error_code ec; timer.cancel(ec); assert(!ec); return ret; } void ircd::net::socket::set_timeout(const milliseconds &t) { set_timeout(t, nullptr); } void ircd::net::socket::set_timeout(const milliseconds &t, ec_handler callback) { cancel_timeout(); if(t < milliseconds(0)) return; auto handler { std::bind(&socket::handle_timeout, this, weak_from(*this), std::move(callback), ph::_1) }; // The sending-side of the semaphore is incremented here to invalidate any // pending/queued callbacks to handle_timeout as to not conflict now. The // required companion boolean timer_set is also lit here. assert(timer_sem[0] <= timer_sem[1]); assert(timer_set == false); assert(timedout == false); ++timer_sem[1]; timer_set = true; timer.expires_from_now(t); timer.async_wait(std::move(handler)); } boost::asio::ip::tcp::endpoint ircd::net::socket::local() const { return sd.local_endpoint(); } boost::asio::ip::tcp::endpoint ircd::net::socket::remote() const { return sd.remote_endpoint(); } ircd::net::socket::operator SSL &() { assert(ssl.native_handle()); return *ssl.native_handle(); } ircd::net::socket::operator const SSL &() const { using type = typename std::remove_const::type; auto &ssl(const_cast(this->ssl)); assert(ssl.native_handle()); return *ssl.native_handle(); } /////////////////////////////////////////////////////////////////////////////// // // net/dns.h // /// Linkage for default opts decltype(ircd::net::dns::opts_default) ircd::net::dns::opts_default; decltype(ircd::net::dns::prefetch_ipport) ircd::net::dns::prefetch_ipport{[] (std::exception_ptr, const auto &hostport, const auto &record) { // Do nothing; cache already updated if necessary }}; decltype(ircd::net::dns::prefetch_SRV) ircd::net::dns::prefetch_SRV{[] (std::exception_ptr, const auto &hostport, const auto &record) { // Do nothing; cache already updated if necessary }}; decltype(ircd::net::dns::prefetch_A) ircd::net::dns::prefetch_A{[] (std::exception_ptr, const auto &hostport, const auto &record) { // Do nothing; cache already updated if necessary }}; /// Convenience composition with a single ipport callback. This is the result of /// an automatic chain of queries such as SRV and A/AAAA based on the input and /// intermediate results. void ircd::net::dns::resolve(const hostport &hp, const opts &op, callback_ipport_one cb) { using prototype = void (const hostport &, opts, callback_ipport_one); static mods::import function { "s_dns", "_resolve_ipport" }; function(hp, op, std::move(cb)); } /// Convenience callback with a single SRV record which was selected from /// the vector with stochastic respect for weighting and priority. void ircd::net::dns::resolve(const hostport &hp, const opts &op, callback_SRV_one cb) { using prototype = void (const hostport &, opts, callback_SRV_one); static mods::import function { "s_dns", "_resolve__SRV" }; function(hp, op, std::move(cb)); } /// Convenience callback with a single A record which was selected from /// the vector randomly. void ircd::net::dns::resolve(const hostport &hp, const opts &op, callback_A_one cb) { using prototype = void (const hostport &, opts, callback_A_one); static mods::import function { "s_dns", "_resolve__A" }; function(hp, op, std::move(cb)); } /// Fundamental callback with a vector of abstract resource records. void ircd::net::dns::resolve(const hostport &hp, const opts &op, callback cb) { using prototype = void (const hostport &, const opts &, callback); static mods::import function { "s_dns", "_resolve__" }; function(hp, op, std::move(cb)); } /// Really assumptional and hacky right now. We're just assuming the SRV /// key is the first two elements of a dot-delimited string which start /// with underscores. If that isn't good enough in the future this will rot /// and become a regression hazard. ircd::string_view ircd::net::dns::unmake_SRV_key(const string_view &key) { if(token_count(key, '.') < 3) return key; if(!startswith(token(key, '.', 0), '_')) return key; if(!startswith(token(key, '.', 1), '_')) return key; return tokens_after(key, '.', 1); } ircd::string_view ircd::net::dns::make_SRV_key(const mutable_buffer &out, const hostport &hp, const opts &opts) { if(!opts.srv) return fmt::sprintf { out, "_%s._%s.%s", service(hp), opts.proto, host(hp) }; else return fmt::sprintf { out, "%s%s", opts.srv, host(hp) }; } // // cache // ircd::rfc1035::record * ircd::net::dns::cache::put_error(const rfc1035::question &question, const uint &code) try { using prototype = rfc1035::record *(const rfc1035::question &, const uint &); static mods::import function { "s_dns", "_put_error" }; return function(question, code); } catch(const mods::unavailable &e) { log::dwarning { log, "Failed to put error for '%s' in DNS cache :%s", question.name, e.what() }; return nullptr; } ircd::rfc1035::record * ircd::net::dns::cache::put(const rfc1035::question &question, const rfc1035::answer &answer) try { using prototype = rfc1035::record *(const rfc1035::question &, const rfc1035::answer &); static mods::import function { "s_dns", "_put" }; return function(question, answer); } catch(const mods::unavailable &e) { log::dwarning { log, "Failed to put '%s' in DNS cache :%s", question.name, e.what() }; return nullptr; } /// This function has an opportunity to respond from the DNS cache. If it /// returns true, that indicates it responded by calling back the user and /// nothing further should be done for them. If it returns false, that /// indicates it did not respond and to proceed normally. The response can /// be of a cached successful result, or a cached error. Both will return /// true. bool ircd::net::dns::cache::get(const hostport &hp, const opts &o, const callback &cb) try { using prototype = bool (const hostport &, const opts &, const callback &); static mods::import function { "s_dns", "_get" }; return function(hp, o, cb); } catch(const mods::unavailable &e) { thread_local char buf[128]; log::dwarning { log, "Failed to get '%s' from DNS cache :%s", string(buf, hp), e.what() }; return false; } bool ircd::net::dns::cache::for_each(const string_view &type, const closure &closure) { return for_each(rfc1035::qtype.at(type), closure); } bool ircd::net::dns::cache::for_each(const uint16_t &type, const closure &c) { using prototype = bool (const uint16_t &, const closure &); static mods::import function { "s_dns", "_for_each" }; return function(type, c); } /////////////////////////////////////////////////////////////////////////////// // // net/ipport.h // std::ostream & ircd::net::operator<<(std::ostream &s, const ipport &t) { thread_local char buf[256]; const critical_assertion ca; s << net::string(buf, t); return s; } ircd::string_view ircd::net::string(const mutable_buffer &buf, const uint32_t &ip) { const auto len { ip::address_v4{ip}.to_string().copy(data(buf), size(buf)) }; return { data(buf), size_t(len) }; } ircd::string_view ircd::net::string(const mutable_buffer &buf, const uint128_t &ip) { const auto &pun { reinterpret_cast(ip) }; const auto &punpun { reinterpret_cast &>(pun) }; const auto len { ip::address_v6{punpun}.to_string().copy(data(buf), size(buf)) }; return { data(buf), size_t(len) }; } ircd::string_view ircd::net::string(const mutable_buffer &buf, const ipport &ipp) { const auto len { is_v4(ipp)? fmt::sprintf { buf, "%s:%u", ip::address_v4{host4(ipp)}.to_string(), port(ipp) }: is_v6(ipp)? fmt::sprintf { buf, "%s:%u", ip::address_v6{std::get(ipp)}.to_string(), port(ipp) }: 0 }; return { data(buf), size_t(len) }; } ircd::net::ipport ircd::net::make_ipport(const boost::asio::ip::udp::endpoint &ep) { return ipport { ep.address(), ep.port() }; } ircd::net::ipport ircd::net::make_ipport(const boost::asio::ip::tcp::endpoint &ep) { return ipport { ep.address(), ep.port() }; } boost::asio::ip::udp::endpoint ircd::net::make_endpoint_udp(const ipport &ipport) { return { is_v6(ipport)? ip::udp::endpoint { asio::ip::address_v6 { std::get(ipport) }, port(ipport) } : ip::udp::endpoint { asio::ip::address_v4 { host4(ipport) }, port(ipport) }, }; } boost::asio::ip::tcp::endpoint ircd::net::make_endpoint(const ipport &ipport) { return { is_v6(ipport)? ip::tcp::endpoint { asio::ip::address_v6 { std::get(ipport) }, port(ipport) } : ip::tcp::endpoint { asio::ip::address_v4 { host4(ipport) }, port(ipport) }, }; } bool ircd::net::ipport::cmp_ip::operator()(const ipport &a, const ipport &b) const { if(is_v4(a) && is_v6(b)) return true; if(is_v6(a) && is_v4(b)) return false; assert((is_v4(a) && is_v4(b)) || (is_v6(a) && is_v6(b))); return std::get(a) < std::get(b); } bool ircd::net::ipport::cmp_port::operator()(const ipport &a, const ipport &b) const { return std::get(a) < std::get(b); } // // ipport::ipport // ircd::net::ipport::ipport(const string_view &ip, const string_view &port) :ipport { ip, lex_cast(port) } { } ircd::net::ipport::ipport(const string_view &ip, const uint16_t &port) :ipport { asio::ip::make_address(ip), port } { } ircd::net::ipport::ipport(const rfc1035::record::A &rr, const uint16_t &port) :ipport { rr.ip4, port } { } ircd::net::ipport::ipport(const rfc1035::record::AAAA &rr, const uint16_t &port) :ipport { rr.ip6, port } { } ircd::net::ipport::ipport(const boost::asio::ip::address &address, const uint16_t &port) { std::get(*this) = address.is_v6(); std::get(*this) = port; if(is_v6(*this)) { std::get(*this) = address.to_v6().to_bytes(); std::reverse(std::get(*this).begin(), std::get(*this).end()); } else host4(*this) = address.to_v4().to_ulong(); } ircd::net::ipport::ipport(const uint32_t &ip, const uint16_t &p) { std::get(*this) = false; host6(*this) = 0; host4(*this) = ip; port(*this) = p; } ircd::net::ipport::ipport(const uint128_t &ip, const uint16_t &p) { std::get(*this) = true; host6(*this) = ip; port(*this) = p; } /////////////////////////////////////////////////////////////////////////////// // // net/hostport.h // decltype(ircd::net::canon_port) ircd::net::canon_port { 8448 }; decltype(ircd::net::canon_service) ircd::net::canon_service { "matrix" }; std::ostream & ircd::net::operator<<(std::ostream &s, const hostport &t) { thread_local char buf[256]; const critical_assertion ca; s << string(buf, t); return s; } std::string ircd::net::canonize(const hostport &hp, const uint16_t &port) { const size_t len { size(host(hp)) + 1 + 5 + 1 // optimistic ':' + portnum }; return ircd::string(len, [&hp, &port] (const mutable_buffer &buf) { return canonize(buf, hp, port); }); } ircd::string_view ircd::net::canonize(const mutable_buffer &buf, const hostport &hp, const uint16_t &port) { if(net::port(hp) == 0 || net::port(hp) == port) return fmt::sprintf { buf, "%s", host(hp) }; return fmt::sprintf { buf, "%s:%u", host(hp), net::port(hp) }; } ircd::string_view ircd::net::string(const mutable_buffer &buf, const hostport &hp) { if(empty(service(hp))) return fmt::sprintf { buf, "%s:%u", host(hp), port(hp) }; if(port(hp) == 0) return fmt::sprintf { buf, "%s (%s)", host(hp), service(hp) }; return fmt::sprintf { buf, "%s:%u (%s)", host(hp), port(hp), service(hp) }; } /////////////////////////////////////////////////////////////////////////////// // // net/asio.h // std::string ircd::net::string(const ip::address &addr) { return addr.to_string(); } std::string ircd::net::string(const ip::tcp::endpoint &ep) { std::string ret(128, char{}); const auto addr{string(net::addr(ep))}; const auto data{const_cast(ret.data())}; ret.resize(snprintf(data, ret.size(), "%s:%u", addr.c_str(), port(ep))); return ret; } std::string ircd::net::host(const ip::tcp::endpoint &ep) { return string(addr(ep)); } boost::asio::ip::address ircd::net::addr(const ip::tcp::endpoint &ep) { return ep.address(); } uint16_t ircd::net::port(const ip::tcp::endpoint &ep) { return ep.port(); } /////////////////////////////////////////////////////////////////////////////// // // buffer.h - provide definition for the null buffers and asio conversion // const ircd::buffer::mutable_buffer ircd::buffer::null_buffer { nullptr, nullptr }; const ircd::ilist ircd::buffer::null_buffers {{ null_buffer }}; ircd::buffer::mutable_buffer::operator boost::asio::mutable_buffer() const { return boost::asio::mutable_buffer { data(*this), size(*this) }; } ircd::buffer::const_buffer::operator boost::asio::const_buffer() const { return boost::asio::const_buffer { data(*this), size(*this) }; }