UDPSocket.cpp

00001 /* Copyright (C) 2013 mbed.org, MIT License
00002  *
00003  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004  * and associated documentation files (the "Software"), to deal in the Software without restriction,
00005  * including without limitation the rights to use, copy, modify, merge, publish, distribute,
00006  * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
00007  * furnished to do so, subject to the following conditions:
00008  *
00009  * The above copyright notice and this permission notice shall be included in all copies or
00010  * substantial portions of the Software.
00011  *
00012  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013  * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017  */
00018 
00019 #include "UDPSocket.h"
00020 
00021 #include <string>
00022 #include <algorithm>
00023 
00024 UDPSocket::UDPSocket() {
00025 
00026 }
00027 
00028 int UDPSocket::init(void) {
00029     return init_socket(SOCK_DGRAM, IPPROTO_UDP);
00030 }
00031 
00032 int UDPSocket::bind(int port) {
00033     if (init_socket(SOCK_DGRAM, IPPROTO_UDP) < 0) {
00034         return -1;
00035     }
00036 
00037     sockaddr_in localHost;
00038     std::memset(&localHost, 0, sizeof(sockaddr_in));
00039 
00040     localHost.sin_family = AF_INET;
00041     localHost.sin_port = htons(port);
00042     localHost.sin_addr.s_addr = 0;
00043 
00044     if (_cc3000_module->_socket.bind(_sock_fd, (sockaddr *)&localHost, sizeof(sockaddr_in)) != 0) {
00045         DBG_SOCKET("Failed to bind a socket (udp). Closing socket");
00046         _cc3000_module->_socket.closesocket(_sock_fd);
00047         _sock_fd = -1;
00048         return -1;
00049     }
00050 
00051     return 0;
00052 }
00053 
00054 int UDPSocket::sendTo(Endpoint &remote, char *packet, int length)
00055 {
00056     if (_sock_fd < 0) {
00057         return -1;
00058     }
00059     // TODO - seems to be a bug, waiting for TI to respond
00060     // if (!_blocking) {
00061     //     TimeInterval timeout(_timeout);
00062     //     if (wait_writable(timeout) != 0) {
00063     //         DBG_SOCKET("The socket is not writeable. _sock_fd: %d", _sock_fd);
00064     //         return 0;
00065     //     }
00066     // }
00067 
00068     return _cc3000_module->_socket.sendto(_sock_fd, packet, length, 0, (sockaddr *)&remote._remote_host, sizeof(sockaddr));
00069 }
00070 
00071 int UDPSocket::receiveFrom(Endpoint &remote, char *buffer, int length)
00072 {
00073     if (_sock_fd < 0) {
00074         return -1;
00075     }
00076 
00077     if (!_blocking) {
00078         TimeInterval timeout(_timeout);
00079         if (wait_readable(timeout) != 0) {
00080             DBG_SOCKET("The socket is not readable. _sock_fd: %d", _sock_fd);
00081             return 0;
00082         }
00083     }
00084 
00085     remote.reset_address();
00086     socklen_t remote_host_length = sizeof(remote._remote_host);
00087 
00088     return _cc3000_module->_socket.recvfrom(_sock_fd, buffer, length, 0, (sockaddr *)&remote._remote_host, &remote_host_length);
00089 }
00090 
00091