Add optional bind_ip to Io::start

libxbot-service/include/xbot-service/Io.hpp

@@ -17,7 +17,7 @@ class Io {
 
   static bool getEndpoint(char* ip, size_t ip_len, uint16_t* port);
 
-  static bool start();
+  static bool start(const char* bind_ip="0.0.0.0");
 };
 }  // namespace xbot::service
 

libxbot-service/include/xbot-service/portable/socket.hpp

@@ -19,9 +19,10 @@ typedef XBOT_SOCKET_TYPEDEF* SocketPtr;
 /**
  * Creates a socket and returns the pointer to it
  * @param bind_multicast: true to prepare the socket for listening
+ * @param bind_address: the IP address to bind the socket to (default 0.0.0.0)
  * @return The created socket
  */
-bool initialize(SocketPtr socket, bool bind_multicast);
+bool initialize(SocketPtr socket, bool bind_multicast, const char* bind_address="0.0.0.0");
 
 /**
  * Frees all socket resources

libxbot-service/src/portable/linux/Io.cpp

@@ -97,8 +97,8 @@ bool Io::getEndpoint(char* ip, size_t ip_len, uint16_t* port) {
   return sock::getEndpoint(&udp_socket_, ip, ip_len, port);
 }
 
-bool Io::start() {
-  if (!sock::initialize(&udp_socket_, false)) {
+bool Io::start(const char* bind_ip) {
+  if (!sock::initialize(&udp_socket_, false, bind_ip)) {
     return false;
   }
   return thread::initialize(&io_thread_, runIo, nullptr, nullptr, 0, IO_THD_NAME);

libxbot-service/src/portable/linux/socket.cpp

@@ -66,7 +66,7 @@ bool get_ip(char* ip, size_t ip_len) {
   return success;
 }
 
-bool xbot::service::sock::initialize(SocketPtr socket_ptr, bool bind_multicast) {
+bool xbot::service::sock::initialize(SocketPtr socket_ptr, bool bind_multicast, const char* bind_ip) {
   *socket_ptr = -1;
   // Create a UDP socket
 
@@ -86,6 +86,11 @@ bool xbot::service::sock::initialize(SocketPtr socket_ptr, bool bind_multicast)
     }
   }
 
+
+  sockaddr_in saddr{};
+  saddr.sin_family = AF_INET;
+  saddr.sin_addr.s_addr = inet_addr(bind_ip);
+
   if (bind_multicast) {
     // Allow multiple binaries listening on the same socket.
     {
@@ -107,17 +112,12 @@ bool xbot::service::sock::initialize(SocketPtr socket_ptr, bool bind_multicast)
         return false;
       }
     }
-
-    sockaddr_in saddr{};
-    saddr.sin_family = AF_INET;
-    saddr.sin_addr.s_addr = INADDR_ANY;
     saddr.sin_port = htons(config::multicast_port);
+  }
 
-    // Bind to any address (i.e. 0.0.0.0:port)
-    if (bind(fd, reinterpret_cast<sockaddr*>(&saddr), sizeof(saddr)) < 0) {
-      close(fd);
-      return false;
-    }
+  if (bind(fd, reinterpret_cast<sockaddr*>(&saddr), sizeof(saddr)) < 0) {
+    close(fd);
+    return false;
   }
 
   // Create a pointer to the fd and return it.