UTC:2025-11-25 8:09:42 :

source/main.cpp

@@ -339,8 +339,9 @@ int main(int argc, char *argv[])
     ::std::string   dmd3aIP = argv[1];
     ::std::uint16_t targetPort
         = static_cast<::std::uint16_t>(::std::strtoul(argv[2], nullptr, 10));
+    ::std::string   bindIP = argv[3];
     ::std::uint16_t listenPort
-        = static_cast<::std::uint16_t>(::std::strtoul(argv[3], nullptr, 10));
+        = static_cast<::std::uint16_t>(::std::strtoul(argv[4], nullptr, 10));
 
     // Create socket.
     int fd = ::socket(AF_INET, SOCK_DGRAM, 0);
@@ -360,7 +361,10 @@ int main(int argc, char *argv[])
     ::sockaddr_in bindAddress;
     ::memset(&bindAddress, 0, sizeof(bindAddress));
     bindAddress.sin_family = AF_INET;
-    bindAddress.sin_addr.s_addr = INADDR_ANY;
+    if (! ::inet_pton(AF_INET, bindIP.c_str(), &bindAddress.sin_addr)) {
+        ::std::cerr << "Illegal local IP address \"" << bindIP << "\".";
+        return -1;
+    }
     bindAddress.sin_port = listenPort;
     auto bindResult = ::bind(fd, reinterpret_cast<::sockaddr *>(&bindAddress),
                              sizeof(bindAddress));