SocketGUS
Fork of Socket by
UDPSocket.cpp
- Committer:
- emilmont
- Date:
- 2012-07-25
- Revision:
- 3:e6474399e057
- Parent:
- 2:b227d242f3c7
- Child:
- 5:300e7ad2dc1d
File content as of revision 3:e6474399e057:
/* 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 "UDPSocket.h" #include <cstring> using std::memset; UDPSocket::UDPSocket() { } // Server initialization int UDPSocket::bind(int port) { if (init(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; } // -1 if unsuccessful, else number of bytes written int UDPSocket::sendTo(char* data, int length, char* host, int port, int timeout) { if (_sock_fd < 0) return -1; struct sockaddr_in remoteHost; //Populate m_remoteHost std::memset(&remoteHost, 0, sizeof(struct sockaddr_in)); //Resolve DNS address or populate hard-coded IP address struct hostent *server = ::gethostbyname(host); if (server == NULL) { return -1; //Could not resolve address } std::memcpy((char*) &remoteHost.sin_addr.s_addr, (char*) server->h_addr_list[0], server->h_length); remoteHost.sin_family = AF_INET; remoteHost.sin_port = htons(port); size_t writtenLen = 0; set_timeout(timeout); while (writtenLen < length) { //Wait for socket to be writeable //Creating FS set if (wait_writable() != 0) return writtenLen; //Timeout -- FIXME should we return -1 or writtenLength ? int ret = lwip_sendto(_sock_fd, data + writtenLen, length - writtenLen, 0, (const struct sockaddr *) &remoteHost, sizeof(remoteHost)); if (ret > 0) { writtenLen += ret; } else if (ret == 0) { return writtenLen; //Connection was closed by server -- FIXME how do we signal that the connection was closed ? } else { return -1; //Connnection error } } return writtenLen; } // -1 if unsuccessful, else number of bytes received int UDPSocket::receiveFrom(char* data, int length, char** host, int* port, int timeout) { if (_sock_fd < 0) return -1; set_timeout(timeout); if (wait_readable() != 0) return -1; struct sockaddr_in remoteHost; std::memset(&remoteHost, 0, sizeof(struct sockaddr_in)); socklen_t remoteHostLen = sizeof(remoteHost); int n = lwip_recvfrom(_sock_fd, data, length, 0, (struct sockaddr*) &remoteHost, &remoteHostLen); if (n < 0) return -1; static char hostBuf[16]; inet_ntoa_r(remoteHost.sin_addr, hostBuf, sizeof(hostBuf)); *host = hostBuf; *port = ntohs(remoteHost.sin_port); return n; } UDPSocket::~UDPSocket() { close(); //Don't want to leak }