Add missing p25cai class (lost during check-in).

git-svn-id: http://op25.osmocom.org/svn/trunk@252 65a5c917-d112-43f1-993d-58c26a4786be

decoder/src/lib/p25cai_du_handler.cc

@@ -0,0 +1,85 @@
+/* -*- C++ -*- */
+
+/*
+ * Copyright 2008-2011 Steve Glass
+ * 
+ * This file is part of OP25.
+ * 
+ * OP25 is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * OP25 is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+ * License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with OP25; see the file COPYING. If not, write to the Free
+ * Software Foundation, Inc., 51 Franklin Street, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <arpa/inet.h>
+#include <cstdio>
+#include <cstring>
+#include <iomanip>
+#include <netinet/in.h>
+#include <p25cai_du_handler.h>
+#include <sstream>
+#include <sys/socket.h>
+#include <sys/socket.h>
+
+using namespace std;
+
+p25cai_du_handler::p25cai_du_handler(data_unit_handler_sptr next, const char *addr, int port) :
+   data_unit_handler(next),
+   d_cai(-1),
+   d_address("Unavailable")
+{
+	struct sockaddr_in sin;
+	sin.sin_family = AF_INET;
+	sin.sin_port = htons(port);
+	inet_aton(addr, &sin.sin_addr);
+	d_cai = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+	if(-1 != d_cai) {
+      if(-1 == connect(d_cai, (struct sockaddr*) &sin, sizeof(sin))) {
+         ostringstream address;
+         address << addr << ":" << port;
+         d_address = address.str();
+      } else {
+         perror("connect(d_tap, (struct sockaddr*) &sin, sizeof(sin))");
+         close(d_cai);
+         d_cai = -1;
+      }
+   } else {
+		perror("socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)");
+      d_cai = -1;
+   }
+}
+
+p25cai_du_handler::~p25cai_du_handler()
+{
+   if(-1 != d_cai) {
+      close(d_cai);
+   }
+}
+
+const char*
+p25cai_du_handler::destination() const
+{
+   return d_address.c_str();
+}
+
+void
+p25cai_du_handler::handle(data_unit_sptr du)
+{
+   if(-1 != d_cai) {
+      const size_t CAI_SZ = du->size();
+      uint8_t cai[CAI_SZ];
+      du->decode_frame(CAI_SZ, cai);
+      write(d_cai, cai, CAI_SZ);
+   }
+   data_unit_handler::handle(du);
+}

decoder/src/lib/p25cai_du_handler.h

@@ -0,0 +1,84 @@
+/* -*- C++ -*- */
+
+/*
+ * Copyright 2008-2011 Steve Glass
+ * 
+ * This file is part of OP25.
+ * 
+ * OP25 is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * OP25 is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+ * License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with OP25; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 51 Franklin Street, Boston, MA
+ * 02110-1301, USA.
+*/
+
+#ifndef INCLUDED_P25CAI_DU_HANDLER_H
+#define INCLUDED_P25CAI_DU_HANDLER_H
+
+#include <data_unit_handler.h>
+#include <string>
+
+/**
+ * This data_unit_handler forwards received frames using p25cai - a
+ * straighforward encapsulation of the P25 CAI in a UDP datagram. This
+ * format is understood by Wireshark and replaces the use of TUN/TAP
+ * which require root privileges and are not present by default on
+ * some platforms.
+ */
+class p25cai_du_handler : public data_unit_handler
+{
+
+public:
+
+   /**
+    * p25cai_du_handler constructor.
+    *
+    * \param next The next data_unit_handler.
+	 * \param addr The address of the receiver.
+	 * \param port The port number of the receiver.
+    */
+   p25cai_du_handler(data_unit_handler_sptr next, const char *addr, int port);
+
+   /**
+    * p25cai_du_handler virtual destructor.
+    */
+   virtual ~p25cai_du_handler();
+
+   /**
+    * Handle a received P25 frame.
+    *
+    * \param du A non-null data_unit_sptr to handle.
+    */
+   virtual void handle(data_unit_sptr du);
+
+   /**
+    * Return a pointer to a string identifying the destination address.
+    *
+    * \return A pointer to a NUL-terminated character string.
+    */
+   const char *destination() const;
+
+private:
+
+   /**
+    * file descriptor for the UDP socket.
+    */
+   int32_t d_cai;
+
+   /**
+    * A string identifying the address of the receiver.
+    */
+   std::string d_address;
+
+};
+
+#endif /* INCLUDED_P25CAI_DU_HANDLER_H */