UDPSocket.cpp

00001 /* Copyright (C) 2012 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 UDPSocket::UDPSocket()
00022 {
00023 }
00024 
00025 int UDPSocket::init(void)
00026 {
00027     if (_sock_fd < 0) {
00028         _sock_fd = eth->new_socket();
00029     }
00030     eth->setProtocol(_sock_fd, UDP);
00031     return 0;
00032 }
00033 
00034 // Server initialization
00035 int UDPSocket::bind(int port)
00036 {
00037     if (_sock_fd < 0) {
00038         _sock_fd = eth->new_socket();
00039         if (_sock_fd < 0) {
00040             return -1;
00041         }
00042     }
00043     // set local port
00044     eth->sreg<uint16_t>(_sock_fd, Sn_PORT, port);
00045     // set udp protocol
00046     eth->setProtocol(_sock_fd, UDP);
00047     eth->scmd(_sock_fd, OPEN);
00048     return 0;
00049 }
00050 
00051 // -1 if unsuccessful, else number of bytes written
00052 int UDPSocket::sendTo(Endpoint &remote, char *packet, int length)
00053 {
00054     int size = eth->wait_writeable(_sock_fd, _blocking ? -1 : _timeout, length-1);
00055     if (size < 0) {
00056         return -1;
00057     }
00058     confEndpoint(remote);
00059     int ret = eth->send(_sock_fd, packet, length);
00060     return ret;
00061 }
00062 
00063 // -1 if unsuccessful, else number of bytes received
00064 int UDPSocket::receiveFrom(Endpoint &remote, char *buffer, int length)
00065 {
00066     uint8_t info[8];
00067     int size = eth->wait_readable(_sock_fd, _blocking ? -1 : _timeout, sizeof(info));
00068     if (size < 0) {
00069         return -1;
00070     }
00071     eth->recv(_sock_fd, (char*)info, sizeof(info));
00072     readEndpoint(remote, info);
00073     int udp_size = info[6]<<8|info[7]; 
00074     //TEST_ASSERT(udp_size <= (size-sizeof(info)));
00075     if (udp_size > (size-sizeof(info))) {
00076         return -1;
00077     }
00078     return eth->recv(_sock_fd, buffer, udp_size);
00079 }
00080 
00081 void UDPSocket::confEndpoint(Endpoint & ep)
00082 {
00083     char * host = ep.get_address();
00084     // set remote host
00085     eth->sreg_ip(_sock_fd, Sn_DIPR, host);
00086     // set remote port
00087     eth->sreg<uint16_t>(_sock_fd, Sn_DPORT, ep.get_port());
00088 }
00089 
00090 void UDPSocket::readEndpoint(Endpoint & ep, uint8_t info[])
00091 {
00092     char addr[17];
00093     snprintf(addr, sizeof(addr), "%d.%d.%d.%d", info[0], info[1], info[2], info[3]);
00094     uint16_t port = info[4]<<8|info[5];
00095     ep.set_address(addr, port);
00096 }