113 lines
3.6 KiB
C++
113 lines
3.6 KiB
C++
/* Copyright (C) 2012 mbed.org, MIT License
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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* and associated documentation files (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge, publish, distribute,
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* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or
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* substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "UDPSocket.h"
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static int udp_local_port;
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UDPSocket::UDPSocket()
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{
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}
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// After init function, bind() should be called.
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int UDPSocket::init(void)
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{
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if (_sock_fd < 0) {
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_sock_fd = eth->new_socket();
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}
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if (eth->setProtocol(_sock_fd, UDP) == false) return -1;
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return 0;
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}
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// Server initialization
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int UDPSocket::bind(int port)
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{
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if (_sock_fd < 0) {
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_sock_fd = eth->new_socket();
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if (_sock_fd < 0) {
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return -1;
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}
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}
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// set local port
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if (port != 0) {
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eth->sreg<uint16_t>(_sock_fd, Sn_PORT, port);
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} else {
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udp_local_port++;
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eth->sreg<uint16_t>(_sock_fd, Sn_PORT, udp_local_port);
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}
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// set udp protocol
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eth->setProtocol(_sock_fd, UDP);
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eth->scmd(_sock_fd, OPEN);
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return 0;
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}
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// -1 if unsuccessful, else number of bytes written
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int UDPSocket::sendTo(Endpoint &remote, char *packet, int length)
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{
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int size = eth->wait_writeable(_sock_fd, _blocking ? -1 : _timeout, length-1);
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if (size < 0) {
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return -1;
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}
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confEndpoint(remote);
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int ret = eth->send(_sock_fd, packet, length);
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return ret;
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}
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// -1 if unsuccessful, else number of bytes received
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int UDPSocket::receiveFrom(Endpoint &remote, char *buffer, int length)
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{
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uint8_t info[8];
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int size = eth->wait_readable(_sock_fd, _blocking ? -1 : _timeout, sizeof(info));
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if (size < 0) {
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return -1;
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}
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eth->recv(_sock_fd, (char*)info, sizeof(info));
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readEndpoint(remote, info);
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int udp_size = info[6]<<8|info[7];
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//TEST_ASSERT(udp_size <= (size-sizeof(info)));
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if (udp_size > (size-sizeof(info))) {
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return -1;
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}
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/* Perform Length check here to prevent buffer overrun */
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/* fixed by Sean Newton (https://developer.mbed.org/users/SeanNewton/) */
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if (udp_size > length) {
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//printf("udp_size: %d\n",udp_size);
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return -1;
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}
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return eth->recv(_sock_fd, buffer, udp_size);
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}
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void UDPSocket::confEndpoint(Endpoint & ep)
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{
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char * host = ep.get_address();
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// set remote host
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eth->sreg_ip(_sock_fd, Sn_DIPR, host);
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// set remote port
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eth->sreg<uint16_t>(_sock_fd, Sn_DPORT, ep.get_port());
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}
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void UDPSocket::readEndpoint(Endpoint & ep, uint8_t info[])
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{
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char addr[17];
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snprintf(addr, sizeof(addr), "%d.%d.%d.%d", info[0], info[1], info[2], info[3]);
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uint16_t port = info[4]<<8|info[5];
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ep.set_address(addr, port);
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}
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