Diff: EthernetInterface/Socket/UDPSocket.cpp

Revision:

3:78f223d34f36

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/EthernetInterface/Socket/UDPSocket.cpp	Tue Mar 05 02:34:44 2019 +0000
@@ -0,0 +1,94 @@
+/* Copyright (C) 2012 mbed.org, MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "Socket/UDPSocket.h"
+
+#include <cstring>
+
+using std::memset;
+
+UDPSocket::UDPSocket() {
+}
+
+int UDPSocket::init(void) {
+    return init_socket(SOCK_DGRAM);
+}
+
+// Server initialization
+int UDPSocket::bind(int port) {
+    if (init_socket(SOCK_DGRAM) < 0)
+        return -1;
+    
+    struct sockaddr_in localHost;
+    std::memset(&localHost, 0, sizeof(localHost));
+    
+    localHost.sin_family = AF_INET;
+    localHost.sin_port = htons(port);
+    localHost.sin_addr.s_addr = INADDR_ANY;
+    
+    if (lwip_bind(_sock_fd, (const struct sockaddr *) &localHost, sizeof(localHost)) < 0) {
+        close();
+        return -1;
+    }
+    
+    return 0;
+}
+
+int UDPSocket::join_multicast_group(const char* address) {
+    struct ip_mreq mreq;
+    
+    // Set up group address 
+    mreq.imr_multiaddr.s_addr = inet_addr(address);
+    mreq.imr_interface.s_addr = htonl(INADDR_ANY);
+    
+    return set_option(IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
+}
+
+int UDPSocket::set_broadcasting(bool broadcast) {
+    int option = (broadcast) ? (1) : (0);
+    return set_option(SOL_SOCKET, SO_BROADCAST, &option, sizeof(option));
+}
+
+// -1 if unsuccessful, else number of bytes written
+int UDPSocket::sendTo(Endpoint &remote, char *packet, int length) {
+    if (_sock_fd < 0)
+        return -1;
+    
+    if (!_blocking) {
+        TimeInterval timeout(_timeout);
+        if (wait_writable(timeout) != 0)
+            return 0;
+    }
+    
+    return lwip_sendto(_sock_fd, packet, length, 0, (const struct sockaddr *) &remote._remoteHost, sizeof(remote._remoteHost));
+}
+
+// -1 if unsuccessful, else number of bytes received
+int UDPSocket::receiveFrom(Endpoint &remote, char *buffer, int length) {
+    if (_sock_fd < 0)
+        return -1;
+    
+    if (!_blocking) {
+        TimeInterval timeout(_timeout);
+        if (wait_readable(timeout) != 0)
+            return 0;
+    }
+    remote.reset_address();
+    socklen_t remoteHostLen = sizeof(remote._remoteHost);
+    return lwip_recvfrom(_sock_fd, buffer, length, 0, (struct sockaddr*) &remote._remoteHost, &remoteHostLen);
+}