From abeb1da46ca7b6a13a5c47c01d9141df4a8e1989 Mon Sep 17 00:00:00 2001
From: Maxim Mamontov <faust.madf@gmail.com>
Date: Sun, 2 Dec 2012 17:32:42 +0200
Subject: [PATCH] Added SMUX reconnect. Fixes #18.

---
 .../stargazer/plugins/other/smux/smux.cpp     | 42 +++++++++++++++++--
 projects/stargazer/plugins/other/smux/smux.h  |  5 +++
 2 files changed, 43 insertions(+), 4 deletions(-)

diff --git a/projects/stargazer/plugins/other/smux/smux.cpp b/projects/stargazer/plugins/other/smux/smux.cpp
index bef6e462..81b9ccb5 100644
--- a/projects/stargazer/plugins/other/smux/smux.cpp
+++ b/projects/stargazer/plugins/other/smux/smux.cpp
@@ -103,6 +103,9 @@ SMUX::SMUX()
       mutex(),
       running(false),
       stopped(true),
+      needReconnect(false),
+      lastReconnectTry(0),
+      reconnectTimeout(1),
       sock(-1),
       smuxHandlers(),
       pdusHandlers(),
@@ -157,7 +160,7 @@ assert(corporations != NULL && "corporations must not be NULL");
 assert(traffcounter != NULL && "traffcounter must not be NULL");
 
 if (PrepareNet())
-    return -1;
+    needReconnect = true;
 
 // Users
 sensors[OID(".1.3.6.1.4.1.38313.1.1.1")] = new TotalUsersSensor(*users);
@@ -286,15 +289,15 @@ void SMUX::Run()
 {
 stopped = true;
 if (!SendOpenPDU(sock))
-    return;
+    needReconnect = true;
 if (!SendRReqPDU(sock))
-    return;
+    needReconnect = true;
 running = true;
 stopped = false;
 
 while(running)
     {
-    if (WaitPackets(sock))
+    if (WaitPackets(sock) && !needReconnect)
         {
         SMUX_PDUs_t * pdus = RecvSMUXPDUs(sock);
         if (pdus)
@@ -302,7 +305,11 @@ while(running)
             DispatchPDUs(pdus);
             ASN_STRUCT_FREE(asn_DEF_SMUX_PDUs, pdus);
             }
+        else if (running)
+            Reconnect();
         }
+    else if (running && needReconnect)
+        Reconnect();
     if (!running)
         break;
     }
@@ -339,6 +346,33 @@ if (connect(sock, reinterpret_cast<struct sockaddr *>(&addr), sizeof(addr)))
 return false;
 }
 
+bool SMUX::Reconnect()
+{
+if (needReconnect && difftime(time(NULL), lastReconnectTry) < reconnectTimeout)
+    return true;
+
+time(&lastReconnectTry);
+SendClosePDU(sock);
+close(sock);
+if (!PrepareNet())
+    if (SendOpenPDU(sock))
+        if (SendRReqPDU(sock))
+            {
+            reconnectTimeout = 1;
+            needReconnect = false;
+            logger("Connected successfully");
+            printfd(__FILE__, "Connected successfully\n");
+            return false;
+            }
+
+if (needReconnect)
+    if (reconnectTimeout < 60)
+        reconnectTimeout *= 2;
+
+needReconnect = true;
+return true;
+}
+
 bool SMUX::DispatchPDUs(const SMUX_PDUs_t * pdus)
 {
 SMUXHandlers::iterator it(smuxHandlers.find(pdus->present));
diff --git a/projects/stargazer/plugins/other/smux/smux.h b/projects/stargazer/plugins/other/smux/smux.h
index cc722511..ef7b191c 100644
--- a/projects/stargazer/plugins/other/smux/smux.h
+++ b/projects/stargazer/plugins/other/smux/smux.h
@@ -138,6 +138,7 @@ private:
     static void * Runner(void * d);
     void Run();
     bool PrepareNet();
+    bool Reconnect();
 
     bool DispatchPDUs(const SMUX_PDUs_t * pdus);
 
@@ -168,6 +169,10 @@ private:
     pthread_mutex_t mutex;
     bool running;
     bool stopped;
+    bool needReconnect;
+
+    time_t lastReconnectTry;
+    unsigned reconnectTimeout;
 
     int sock;
 
-- 
2.43.2