replace sprintf with snprintf;

src/fne/network/PeerNetwork.cpp

@@ -124,10 +124,10 @@ bool PeerNetwork::writeConfig()
     json::value v = json::value(config);
     std::string json = v.serialize();
 
-    char buffer[json.length() + 8U];
+    char buffer[json.length() + 9U];
 
     ::memcpy(buffer + 0U, TAG_REPEATER_CONFIG, 4U);
-    ::sprintf(buffer + 8U, "%s", json.c_str());
+    ::snprintf(buffer + 8U, json.length() + 1U, "%s", json.c_str());
 
     if (m_debug) {
         Utils::dump(1U, "Network Message, Configuration", (uint8_t*)buffer, json.length() + 8U);

src/host/network/Network.cpp

@@ -818,10 +818,10 @@ bool Network::writeConfig()
     json::value v = json::value(config);
     std::string json = v.serialize();
 
-    char buffer[json.length() + 8U];
+    char buffer[json.length() + 9U];
 
     ::memcpy(buffer + 0U, TAG_REPEATER_CONFIG, 4U);
-    ::sprintf(buffer + 8U, "%s", json.c_str());
+    ::snprintf(buffer + 8U, json.length() + 1U, "%s", json.c_str());
 
     if (m_debug) {
         Utils::dump(1U, "Network Message, Configuration", (uint8_t*)buffer, json.length() + 8U);