kiwix::getNetworkInterfacesIPv4Or6()

- Restored kiwix::getNetworkInterfaces() API to the version before
  support for IPv6 was introduced

- Renamed the new API method to kiwix::getNetworkInterfacesIPv4Or6()

include/tools.h

@@ -25,10 +25,13 @@
 #include <map>
 #include <cstdint>
 
-namespace kiwix {
-struct IpAddress{
-    std::string addr;
-    std::string addr6;
+namespace kiwix
+{
+
+struct IpAddress
+{
+    std::string addr;  // IPv4 address
+    std::string addr6; // IPv6 address
 };
 
 typedef std::pair<std::string, std::string> LangNameCodePair;
@@ -223,11 +226,21 @@ std::string getMimeTypeForFile(const std::string& filename);
 /** Provides all available network interfaces
  *
  * This function provides the available IPv4 and IPv6 network interfaces
+ * as a map from the interface name to its IPv4 and/or IPv6 address(es).
  */
-std::map<std::string,IpAddress> getNetworkInterfaces();
+std::map<std::string, IpAddress> getNetworkInterfacesIPv4Or6();
+
+/** Provides all available IPv4 network interfaces
+ *
+ * This function provides the available IPv4 network interfaces
+ * as a map from the interface name to its IPv4 address.
+ *
+ * Provided for backward compatibility with libkiwix v13.1.0.
+ */
+std::map<std::string, std::string> getNetworkInterfaces();
 
 /** Provides the best IP address
- * This function provides the best IP address from the list given by getNetworkInterfaces
+ * This function provides the best IP address from the list given by getNetworkInterfacesIPv4Or6()
  */
 std::string getBestPublicIp(bool ipv6);
 

src/tools/networkTools.cpp

@@ -191,7 +191,7 @@ std::map<std::string, IpAddress> getNetworkInterfacesPosix() {
 
 } // unnamed namespace
 
-std::map<std::string, IpAddress> getNetworkInterfaces() {
+std::map<std::string, IpAddress> getNetworkInterfacesIPv4Or6() {
 #ifdef _WIN32
   return getNetworkInterfacesWin();
 #else
@@ -199,9 +199,22 @@ std::map<std::string, IpAddress> getNetworkInterfaces() {
 #endif
 }
 
+std::map<std::string, std::string> getNetworkInterfaces() {
+  std::map<std::string, std::string> result;
+  for ( const auto& kv : getNetworkInterfacesIPv4Or6() ) {
+      const std::string& interfaceName = kv.first;
+      const auto& ipAddresses = kv.second;
+      if ( !ipAddresses.addr.empty() ) {
+        result[interfaceName] = ipAddresses.addr;
+      }
+  }
+  return result;
+}
+
+
 std::string getBestPublicIp(bool ipv6) {
   IpAddress bestPublicIp = IpAddress{"127.0.0.1","::1"};
-  std::map<std::string, IpAddress> interfaces = getNetworkInterfaces();
+  std::map<std::string, IpAddress> interfaces = getNetworkInterfacesIPv4Or6();
 
 #ifndef _WIN32
   const char* const prioritizedNames[] =