Support the ident protocol

fix #3211

3 files changed, 151 insertions, 0 deletions

diff --git a/src/identd/identd_server.hpp b/src/identd/identd_server.hpp
new file mode 100644
index 0000000..4270749
--- /dev/null
+++ b/src/identd/identd_server.hpp
@@ -0,0 +1,38 @@
+#pragma once
+
+#include <network/tcp_server_socket.hpp>
+#include <identd/identd_socket.hpp>
+#include <unistd.h>
+
+class BiboumiComponent;
+
+class IdentdServer: public TcpSocketServer<IdentdSocket>
+{
+ public:
+  IdentdServer(const BiboumiComponent& biboumi_component, std::shared_ptr<Poller> poller, const uint16_t port):
+      TcpSocketServer<IdentdSocket>(poller, port),
+      biboumi_component(biboumi_component)
+  {}
+
+  const BiboumiComponent& get_biboumi_component() const
+  {
+    return this->biboumi_component;
+  }
+  void shutdown()
+  {
+    if (this->poller->is_managing_socket(this->socket))
+      this->poller->remove_socket_handler(this->socket);
+    ::close(this->socket);
+  }
+  void clean()
+  {
+    this->sockets.erase(std::remove_if(this->sockets.begin(), this->sockets.end(),
+                                       [](const std::unique_ptr<IdentdSocket>& socket)
+                                       {
+                                         return socket->get_socket() == -1;
+                                       }),
+                        this->sockets.end());
+  }
+ private:
+  const BiboumiComponent& biboumi_component;
+};
diff --git a/src/identd/identd_socket.cpp b/src/identd/identd_socket.cpp
new file mode 100644
index 0000000..c1ad55e
--- /dev/null
+++ b/src/identd/identd_socket.cpp
@@ -0,0 +1,69 @@
+#include <identd/identd_socket.hpp>
+#include <identd/identd_server.hpp>
+#include <xmpp/biboumi_component.hpp>
+#include <iomanip>
+
+#include <utils/sha1.hpp>
+
+#include <logger/logger.hpp>
+
+IdentdSocket::IdentdSocket(std::shared_ptr<Poller> poller, const socket_t socket, TcpSocketServer<IdentdSocket>& server):
+  TCPSocketHandler(poller),
+  server(dynamic_cast<IdentdServer&>(server))
+{
+  this->socket = socket;
+}
+
+void IdentdSocket::parse_in_buffer(const std::size_t)
+{
+  while (true)
+    {
+      const auto line_end = this->in_buf.find('\n');
+      if (line_end == std::string::npos)
+        break;
+      std::istringstream line(this->in_buf.substr(0, line_end));
+      this->consume_in_buffer(line_end + 1);
+
+      uint16_t local_port;
+      uint16_t remote_port;
+      char sep;
+      line >> local_port >> sep >> remote_port;
+      const auto& xmpp = this->server.get_biboumi_component();
+      auto response = this->generate_answer(xmpp, local_port, remote_port);
+
+      this->send_data(std::move(response));
+    }
+}
+
+static std::string hash_jid(const std::string& jid)
+{
+  sha1nfo sha1;
+  sha1_init(&sha1);
+  sha1_write(&sha1, jid.data(), jid.size());
+  const uint8_t* res = sha1_result(&sha1);
+  std::ostringstream result;
+  for (int i = 0; i < HASH_LENGTH; i++)
+    result << std::hex << std::setfill('0') << std::setw(2) << static_cast<int>(res[i]);
+  return result.str();
+}
+
+std::string IdentdSocket::generate_answer(const BiboumiComponent& biboumi, uint16_t local, uint16_t remote)
+{
+  for (const Bridge* bridge: biboumi.get_bridges())
+    {
+      for (const auto& pair: bridge->get_irc_clients())
+        {
+          if (pair.second->match_port_pairt(local, remote))
+            {
+              std::ostringstream os;
+              os << local << " , " << remote << " : USERID : OTHER : " << hash_jid(bridge->get_bare_jid());
+              log_debug("Identd, sending: ", os.str());
+              return os.str();
+            }
+        }
+    }
+  std::ostringstream os;
+  os << local << " , " << remote << " ERROR : NO-USER";
+  log_debug("Identd, sending: ", os.str());
+  return os.str();
+}
diff --git a/src/identd/identd_socket.hpp b/src/identd/identd_socket.hpp
new file mode 100644
index 0000000..6d6cc1d
--- /dev/null
+++ b/src/identd/identd_socket.hpp
@@ -0,0 +1,44 @@
+#pragma once
+
+#include <network/socket_handler.hpp>
+
+#include <cassert>
+#include <network/tcp_socket_handler.hpp>
+
+#include <logger/logger.hpp>
+#include <xmpp/biboumi_component.hpp>
+
+class XmppComponent;
+class IdentdSocket;
+class IdentdServer;
+template <typename T>
+class TcpSocketServer;
+
+class IdentdSocket: public TCPSocketHandler
+{
+ public:
+  IdentdSocket(std::shared_ptr<Poller> poller, const socket_t socket, TcpSocketServer<IdentdSocket>& server);
+  ~IdentdSocket() = default;
+  std::string generate_answer(const BiboumiComponent& biboumi, uint16_t local, uint16_t remote);
+
+  void parse_in_buffer(const std::size_t size) override final;
+  void on_connection_close(const std::string& message) override final
+  {}
+
+  bool is_connected() const override final
+  {
+    return true;
+  }
+  bool is_connecting() const override final
+  {
+    return false;
+  }
+
+ private:
+  void connect() override
+  { assert(false); }
+  void on_connection_failed(const std::string&) override final
+  { assert(false); }
+
+  IdentdServer& server;
+};