.gitignore

@@ -30,3 +30,8 @@ libxmlplusplus-prefix/
 spdlog.pc
 build*
 temp*
+/.idea/
+
+
+
+

library/include/larra/client/client.hpp

@@ -157,6 +157,174 @@ struct StartTlsRequest {
   }
 };
 
+template <typename Socket>
+auto ConnectViaProxy(Socket& socket, const NoProxy&, std::string_view host, std::uint16_t port) -> boost::asio::awaitable<void> {
+  auto executor = co_await boost::asio::this_coro::executor;
+  boost::asio::ip::tcp::resolver resolver(executor);
+  auto endpoints = co_await resolver.async_resolve(host, std::to_string(port), boost::asio::use_awaitable);
+  co_await boost::asio::async_connect(socket, endpoints, boost::asio::use_awaitable);
+  co_return;
+}
+
+template <typename Socket>
+auto ConnectViaProxy(Socket& socket, const HttpProxy&, std::string_view host, std::uint16_t port) -> boost::asio::awaitable<void> {
+  constexpr std::string_view kHttpVersion = "HTTP/1.1";
+  constexpr unsigned int kSuccessStatusCode = 200;
+  constexpr std::string_view kEndOfHeaders = "\r\n\r\n";
+  constexpr int kEndOfHttpSubstring = 5;
+
+  std::string httpConnectRequest = std::format("CONNECT {}:{} {}\r\nHost: {}:{}\r\n\r\n", host, port, kHttpVersion, host, port);
+
+  co_await boost::asio::async_write(
+      socket, boost::asio::buffer(httpConnectRequest), boost::asio::transfer_all(), boost::asio::use_awaitable);
+
+  boost::asio::streambuf proxyServerResponse;
+  co_await boost::asio::async_read_until(socket, proxyServerResponse, kEndOfHeaders, boost::asio::use_awaitable);
+
+  std::istream responseStream(&proxyServerResponse);
+  std::string httpVersion;
+  unsigned int statusCode = 0;
+  std::string statusMessage;
+
+  responseStream >> httpVersion >> statusCode;
+  std::getline(responseStream, statusMessage);
+
+  if(!responseStream || httpVersion.substr(0, kEndOfHttpSubstring) != "HTTP/") {
+    throw std::runtime_error("Invalid HTTP response from proxy");
+  }
+
+  if(statusCode != kSuccessStatusCode) {
+    std::ostringstream errorStream;
+    errorStream << httpVersion << " " << statusCode << " " << statusMessage;
+    throw std::runtime_error("HTTP proxy CONNECT failed: " + errorStream.str());
+  }
+
+  co_return;
+}
+
+template <typename Socket>
+auto ConnectViaProxy(Socket& socket, const Socks5Proxy&, std::string_view address, std::uint16_t port) -> boost::asio::awaitable<void> {
+  constexpr std::array kSocks5RequestStart = {std::byte{0x05}, std::byte{0x01}, std::byte{0x00}, std::byte{0x03}};
+
+  constexpr std::size_t kSocks5RequestMaxSize = 257;
+
+  constexpr std::size_t kSocks5ReplyTypeSize = 10;
+
+  constexpr std::array kHandshakeRequest{std::byte{0x05}, std::byte{0x01}, std::byte{0x00}};
+
+  std::array<std::byte, 2> handshakeResponse;  // NOLINT
+
+  co_await boost::asio::async_write(
+      socket, boost::asio::buffer(kHandshakeRequest), boost::asio::transfer_all(), boost::asio::use_awaitable);
+  co_await boost::asio::async_read(socket, boost::asio::buffer(handshakeResponse), boost::asio::transfer_all(), boost::asio::use_awaitable);
+  if(handshakeResponse[0] != std::byte{0x05} || handshakeResponse[1] != std::byte{0x00}) {  // NOLINT
+    throw std::exception{};
+  };
+  const auto [connectRequest, size] = [&] {
+    const auto size = static_cast<std::byte>(address.size());
+    const auto htonsPort = std::bit_cast<std::array<std::byte, 2>>(htons(port));
+    auto range = std::array{std::span{kSocks5RequestStart.begin(), kSocks5RequestStart.size()},
+                            std::span{&size, 1},
+                            std::span{utils::StartLifetimeAsArray<const std::byte>(address.data(), address.size()), address.size()},
+                            std::span{htonsPort.data(), 2}} |
+                 std::views::join;
+    std::array<std::byte, kSocks5RequestMaxSize> response;  // NOLINT
+    auto sizee = std::ranges::copy(range, response.begin()).out - response.begin();
+    return std::pair{response, sizee};
+  }();
+  co_await boost::asio::async_write(
+      socket, boost::asio::buffer(connectRequest.begin(), size), boost::asio::transfer_all(), boost::asio::use_awaitable);
+  std::array<std::byte, kSocks5ReplyTypeSize> connectReplyType;  // NOLINT
+  co_await boost::asio::async_read(socket, boost::asio::buffer(connectReplyType), boost::asio::transfer_all(), boost::asio::use_awaitable);
+  if(connectReplyType[1] != std::byte{0x00}) {
+    throw std::exception{};
+  };
+  co_return;
+}
+
+template <typename ProxyType>
+auto GetProxySettings(const char* proxyEnv, std::uint16_t port) -> Proxy {
+  std::string_view rawProxyStr = proxyEnv;
+
+  const std::size_t protocolNamePos = rawProxyStr.find("://");
+  std::string_view proxyStr = protocolNamePos == std::string_view::npos ? rawProxyStr : rawProxyStr.substr(protocolNamePos + 3);
+
+  const std::size_t portPos = proxyStr.find(':');
+
+  if(portPos == std::string_view::npos) {
+    return ProxyType{std::string(proxyStr), port};
+  }
+  auto host = std::string(proxyStr.substr(0, portPos));
+  auto portStr = proxyStr.substr(portPos + 1);
+  auto portOpt = ToInt<uint16_t>(portStr);
+
+  if(!portOpt) {
+    throw std::runtime_error("Invalid port number in proxy settings");
+  }
+  return ProxyType{host, portOpt.value()};
+}
+
+inline auto GetSystemProxySettings() -> Proxy {
+  if(const char* proxyEnv = std::getenv("http_proxy")) {
+    constexpr std::uint16_t kHttpPort = 8080;
+    return GetProxySettings<HttpProxy>(proxyEnv, kHttpPort);
+  }
+  if(const char* proxyEnv = std::getenv("socks_proxy")) {
+    constexpr std::uint16_t kSocksPort = 1080;
+    return GetProxySettings<Socks5Proxy>(proxyEnv, kSocksPort);
+  }
+
+  return NoProxy{};
+}
+
+template <typename Socket>
+auto ConnectViaProxy(Socket& socket, const SystemConfiguredProxy&, std::string_view host, std::uint16_t port)
+    -> boost::asio::awaitable<void> {
+  auto proxyOpt = GetSystemProxySettings();
+
+  co_await std::visit(
+      [&](auto&& proxyVariant) -> boost::asio::awaitable<void> {     // NOLINT
+        co_await ConnectViaProxy(socket, proxyVariant, host, port);  // GCC error if co_return
+      },
+      proxyOpt);
+}
+
+template <typename Socket, typename ProxyType>
+auto ConnectToServer(Socket& socket, const ProxyType& proxy, std::string_view host, std::uint16_t port) -> boost::asio::awaitable<void> {
+  auto executor = co_await boost::asio::this_coro::executor;
+  boost::asio::ip::tcp::resolver resolver(executor);
+
+  if constexpr(!std::same_as<ProxyType, NoProxy>) {
+    auto endpoints = co_await resolver.async_resolve(proxy.hostname, std::to_string(proxy.port), boost::asio::use_awaitable);
+    co_await boost::asio::async_connect(socket, endpoints, boost::asio::use_awaitable);
+    co_await ConnectViaProxy(socket, proxy, host, port);
+  }
+}
+
+template <typename Socket>
+auto ConnectToServer(Socket& socket, const SystemConfiguredProxy& proxy, std::string_view host, std::uint16_t port)
+    -> boost::asio::awaitable<void> {
+  auto executor = co_await boost::asio::this_coro::executor;
+  boost::asio::ip::tcp::resolver resolver(executor);
+  auto endpoints = co_await resolver.async_resolve(host, std::to_string(port), boost::asio::use_awaitable);
+  co_await boost::asio::async_connect(socket, endpoints, boost::asio::use_awaitable);
+
+  co_await ConnectViaProxy(socket, proxy, host, port);
+}
+
+template <typename Socket>
+auto ConnectWithProxy(Socket& socket, const Proxy& proxy, std::string_view host, std::uint16_t port) -> boost::asio::awaitable<void> {
+  co_await std::visit(
+      [&socket, host, port](const auto& proxyVariant) {
+        return ConnectToServer(socket, proxyVariant, host, port);
+      },
+      proxy);
+}
+
+inline auto GetAuthData(const PlainUserAccount& account) -> std::string {
+  return EncodeBase64('\0' + account.jid.username + '\0' + account.password);
+}
+
 struct ClientCreateVisitor {
   UserAccount account;
   const Options& options;
@@ -251,9 +419,18 @@ struct ClientCreateVisitor {
                                               boost::asio::use_awaitable);
   }
 
-  auto Connect(auto& socket, boost::asio::ip::tcp::resolver::results_type resolveResults) -> boost::asio::awaitable<void> {
+  template <typename Socket>
+  auto Connect(Socket& socket) -> boost::asio::awaitable<void> {
+    if(!std::holds_alternative<NoProxy>(this->options.proxy)) {
+      auto host = this->options.hostname.value_or(account.Jid().server);
+      auto port = this->options.port.value_or(kDefaultXmppPort);
+
+      co_await ConnectWithProxy(socket, this->options.proxy, host, port);
+    } else {
+      auto resolveResults = co_await this->Resolve();
       co_await boost::asio::async_connect(socket, resolveResults, boost::asio::use_awaitable);
     }
+  }
 
   template <typename Socket>
   auto ProcessTls(XmlStream<boost::asio::ssl::stream<Socket>>& stream) -> boost::asio::awaitable<void> {
@@ -283,7 +460,7 @@ struct ClientCreateVisitor {
   template <typename Socket>
   inline auto operator()(XmlStream<Socket> stream)
       -> boost::asio::awaitable<std::variant<Client<Socket>, Client<boost::asio::ssl::stream<Socket>>>> {
-    co_await this->Connect(stream.next_layer(), co_await this->Resolve());
+    co_await this->Connect(stream.next_layer());
 
     co_await stream.Send(UserStream{.from = account.Jid(), .to = account.Jid().server, .version = "1.0", .xmlLang = "en"});
     SPDLOG_DEBUG("UserStream sended");
@@ -306,7 +483,7 @@ struct ClientCreateVisitor {
   inline auto operator()(XmlStream<boost::asio::ssl::stream<Socket>> stream)
       -> boost::asio::awaitable<std::variant<Client<Socket>, Client<boost::asio::ssl::stream<Socket>>>> {
     auto& socket = stream.next_layer();
-    co_await this->Connect(socket.next_layer(), co_await this->Resolve());
+    co_await this->Connect(socket.next_layer());
     co_await stream.Send(
         UserStream{.from = account.Jid().Username("anonymous"), .to = account.Jid().server, .version = "1.0", .xmlLang = "en"},
         socket.next_layer());

tests/proxy.cpp

@@ -0,0 +1,114 @@
+#include <gtest/gtest.h>
+
+#include <larra/client/client.hpp>
+#include <larra/impl/mock_socket.hpp>
+#include <larra/proxy.hpp>
+
+using namespace larra::xmpp;
+using boost::asio::ip::tcp;
+namespace asio = boost::asio;
+
+class ProxyTest : public ::testing::Test {
+ protected:
+  boost::asio::io_context io;
+  larra::xmpp::impl::MockSocket mockSocket{io.get_executor()};
+};
+
+// Test 1: Connect via HTTP proxy with successful server response
+TEST_F(ProxyTest, ConnectViaHttpProxy_SuccessfulResponse) {
+  HttpProxy proxy{"proxy_host", 8080};
+
+  std::string targetHost = "target_host";
+  uint16_t targetPort = 80;
+
+  std::string expectedRequest =
+      std::format("CONNECT {}:{} HTTP/1.1\r\nHost: {}:{}\r\n\r\n", targetHost, targetPort, targetHost, targetPort);
+
+  std::string proxyResponse = "HTTP/1.1 200 Connection established\r\n\r\n";
+
+  mockSocket.AddReceivedData(proxyResponse);
+
+  bool connectSuccessful = false;
+
+  asio::co_spawn(
+      io,
+      [&]() -> asio::awaitable<void> {
+        try {
+          co_await client::impl::ConnectViaProxy(mockSocket, proxy, targetHost, targetPort);
+          connectSuccessful = true;
+        } catch(...) {
+          connectSuccessful = false;
+        }
+      },
+      asio::detached);
+
+  io.run();
+
+  std::string sentData = mockSocket.GetSentData();
+
+  EXPECT_EQ(sentData, expectedRequest);
+  EXPECT_TRUE(connectSuccessful);
+}
+
+// Test 2: Connect via SOCKS proxy
+TEST(Socks5ProxyTest, ConnectViaProxy) {
+  constexpr std::uint16_t kSocksPort = 1080;
+  constexpr std::uint16_t kAvailableUdpBufferSpaceForSocks = 262;
+
+  boost::asio::io_context io;
+  auto executor = io.get_executor();
+
+  larra::xmpp::impl::MockSocket socket{executor};
+
+  std::string expectedServerResponse;
+  expectedServerResponse += "\x05\x00";          // VER, METHOD
+  expectedServerResponse += "\x05\x00\x00\x01";  // VER, REP, RSV, ATYP (IPv4)
+  expectedServerResponse += "\x7F\x00\x00\x01";  // BND.ADDR (127.0.0.1)
+  expectedServerResponse += "\x1F\x90";          // BND.PORT (8080)
+
+  socket.AddReceivedData(expectedServerResponse);
+
+  Socks5Proxy proxy{.hostname = "proxy.example.com", .port = kSocksPort};
+  std::string targetHostname = "target.example.com";
+  std::uint16_t targetPort = 80;
+
+  boost::asio::co_spawn(
+      executor,
+      [&]() -> boost::asio::awaitable<void> {
+        co_await client::impl::ConnectViaProxy(socket, proxy, targetHostname, targetPort);
+
+        auto sentData = socket.GetSentData();
+
+        std::string expectedGreeting = "\x05\x01\x00";
+
+        std::array<std::uint8_t, kAvailableUdpBufferSpaceForSocks> expectedRequest{};
+        std::size_t reqLen = 0;
+
+        expectedRequest[reqLen++] = 0x05;  // VER
+        expectedRequest[reqLen++] = 0x01;  // CMD: CONNECT
+        expectedRequest[reqLen++] = 0x00;  // RSV
+        expectedRequest[reqLen++] = 0x03;  // ATYP: DOMAINNAME
+
+        expectedRequest[reqLen++] = static_cast<std::uint8_t>(targetHostname.size());  // domain length
+
+        std::memcpy(&expectedRequest[reqLen], targetHostname.data(), targetHostname.size());
+        reqLen += targetHostname.size();
+
+        std::uint16_t networkOrderPort = htons(targetPort);
+        expectedRequest[reqLen++] = static_cast<std::uint8_t>((networkOrderPort >> 8) & 0xFF);
+        expectedRequest[reqLen++] = static_cast<std::uint8_t>(networkOrderPort & 0xFF);
+
+        std::string expectedData = expectedGreeting;
+        auto transformedView = expectedRequest | std::views::take(reqLen) | std::views::transform([](std::uint8_t byte) {
+                                 return static_cast<char>(byte);
+                               });
+
+        expectedData.append(std::ranges::to<std::string>(transformedView));
+        EXPECT_EQ(sentData, expectedData);
+
+        co_return;
+      },
+      boost::asio::detached);
+
+  io.run();
+}