Support the ident protocol

fix #3211

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();
+}