From fdff20e96d7198124542e6d03c27e1d496c4b328 Mon Sep 17 00:00:00 2001
From: Sergiy G <piratfm@gmail.com>
Date: Wed, 31 Jan 2018 10:41:34 +0200
Subject: Enabled multicast support. Fix missing header in PAPRStats

---
 lib/UdpSocket.cpp | 16 ++++++++++++----
 lib/UdpSocket.h   |  6 ++++--
 2 files changed, 16 insertions(+), 6 deletions(-)

(limited to 'lib')

diff --git a/lib/UdpSocket.cpp b/lib/UdpSocket.cpp
index e711577..7c99724 100644
--- a/lib/UdpSocket.cpp
+++ b/lib/UdpSocket.cpp
@@ -170,7 +170,7 @@ int UdpSocket::send(const std::vector<uint8_t>& data, InetAddress destination)
  *  @param groupname The multicast address to join.
  *  @return 0 if ok, -1 if error
  */
-int UdpSocket::joinGroup(char* groupname)
+int UdpSocket::joinGroup(const char* groupname, const char* if_addr)
 {
     ip_mreqn group;
     if ((group.imr_multiaddr.s_addr = inet_addr(groupname)) == INADDR_NONE) {
@@ -181,7 +181,7 @@ int UdpSocket::joinGroup(char* groupname)
         setInetError("Not a multicast address");
         return -1;
     }
-    group.imr_address.s_addr = htons(INADDR_ANY);;
+    group.imr_address.s_addr = inet_addr(if_addr);
     group.imr_ifindex = 0;
     if (setsockopt(listenSocket, IPPROTO_IP, IP_ADD_MEMBERSHIP, &group, sizeof(group))
             == SOCKET_ERROR) {
@@ -261,8 +261,10 @@ UdpReceiver::~UdpReceiver() {
     }
 }
 
-void UdpReceiver::start(int port, size_t max_packets_queued) {
+void UdpReceiver::start(int port, std::string& bindto, std::string& mcastaddr, size_t max_packets_queued) {
     m_port = port;
+    m_bindto = bindto;
+    m_mcastaddr = mcastaddr;
     m_max_packets_queued = max_packets_queued;
     m_thread = std::thread(&UdpReceiver::m_run, this);
 }
@@ -288,7 +290,13 @@ void UdpReceiver::m_run()
         private: atomic<bool>& m_stop;
     } autoSetStop(m_stop);
 
-    m_sock.reinit(m_port, "0.0.0.0");
+    if(IN_MULTICAST(ntohl(inet_addr(m_mcastaddr.c_str())))){
+        m_sock.reinit(m_port, m_mcastaddr);
+        m_sock.setMulticastSource(m_bindto.c_str());
+        m_sock.joinGroup(m_mcastaddr.c_str(), m_bindto.c_str());
+    } else {
+        m_sock.reinit(m_port, m_bindto);
+    }
 
     const size_t packsize = 8192;
     UdpPacket packet(packsize);
diff --git a/lib/UdpSocket.h b/lib/UdpSocket.h
index 8c968d2..8c71b9d 100644
--- a/lib/UdpSocket.h
+++ b/lib/UdpSocket.h
@@ -111,7 +111,7 @@ class UdpSocket
          */
         int receive(UdpPacket& packet);
 
-        int joinGroup(char* groupname);
+        int joinGroup(const char* groupname, const char *if_addr);
         int setMulticastSource(const char* source_addr);
         int setMulticastTTL(int ttl);
 
@@ -184,7 +184,7 @@ class UdpReceiver {
         UdpReceiver operator=(const UdpReceiver&) = delete;
 
         // Start the receiver in a separate thread
-        void start(int port, size_t max_packets_queued);
+        void start(int port, std::string& bindto, std::string& mcastaddr, size_t max_packets_queued);
 
         // Get the data contained in a UDP packet, blocks if none available
         // In case of error, throws a runtime_error
@@ -194,6 +194,8 @@ class UdpReceiver {
         void m_run(void);
 
         int m_port;
+        std::string m_bindto;
+        std::string m_mcastaddr;
         size_t m_max_packets_queued;
         std::thread m_thread;
         std::atomic<bool> m_stop;
-- 
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