WiFi Channel Settings.

src/ShutdownClient.cpp

@@ -6,6 +6,9 @@
 #include <arpa/inet.h>
 #include "Lv2Log.hpp"
 #include <sstream>
+#include <sys/types.h>
+#include <ifaddrs.h>
+
 
 using namespace pipedal;
 
@@ -138,3 +141,52 @@ bool ShutdownClient::SetJackServerConfiguration(const JackServerSettings & jackS
     
     return WriteMessage(s.str().c_str());
 }
+
+bool ShutdownClient::IsOnLocalSubnet(const std::string&fromAddress)
+{
+    std::string address = fromAddress;
+    if (address.size() == 0) return false;
+    char lastChar = address[address.size()-1];
+    if (address[0] != '[' || lastChar != ']') // i.e. not an ipv6 address;
+    {
+        size_t pos = address.find_last_of(':');
+        if (pos != std::string::npos)
+        {
+            address = address.substr(0,pos);
+        }
+    }
+    if (address[0] == '[') return false;
+
+    char buf[512];
+
+    struct in_addr inetAddr;
+
+    memset(&inetAddr,0,sizeof(inetAddr));
+
+    if (inet_pton(AF_INET,address.c_str(),&inetAddr) == 0) {
+        return false;
+    }
+    uint32_t remoteAddress = htonl(inetAddr.s_addr);
+
+    struct ifaddrs *ifap = nullptr;
+    if (getifaddrs(&ifap) != 0) return false;
+
+    bool result = false;
+    for (ifaddrs*p = ifap; p != nullptr; p = p->ifa_next) {
+        if (p->ifa_addr->sa_family == AF_INET && p->ifa_addr != nullptr && p->ifa_netmask != nullptr) {  // TODO: Add support for AF_INET6
+            uint32_t netmask = htonl(((sockaddr_in*)(p->ifa_netmask))->sin_addr.s_addr);
+            uint32_t ifAddr = htonl(((sockaddr_in*)(p->ifa_addr))->sin_addr.s_addr);
+
+            if ((netmask & ifAddr) == (netmask & remoteAddress))
+            {
+                result = true;
+                break;
+            }
+        }
+    }
+    freeifaddrs(ifap);
+    return result;
+
+
+    
+}