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Fork of Socket by
UDPSocket.cpp
- Committer:
- emilmont
- Date:
- 2012-07-23
- Revision:
- 2:b227d242f3c7
- Parent:
- 1:8080965f5d76
- Child:
- 3:e6474399e057
File content as of revision 2:b227d242f3c7:
/* 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() : m_sock(-1) { } UDPSocket::~UDPSocket() { close(); //Don't want to leak } int UDPSocket::bind(int port) { int ret = init(); if( ret < 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; ret = ::bind(m_sock, (const struct sockaddr *)&localHost, sizeof(localHost)); if (ret < 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( m_sock < 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; struct timeval t_val; //t_val will be decremented on each call to select() t_val.tv_sec = timeout / 1000; t_val.tv_usec = (timeout - (t_val.tv_sec * 1000)) * 1000; while(writtenLen < length) { //Wait for socket to be writeable //Creating FS set fd_set socksSet; FD_ZERO(&socksSet); FD_SET(m_sock, &socksSet); int ret = ::select(FD_SETSIZE, NULL, &socksSet, NULL, &t_val); if(ret <= 0 || !FD_ISSET(m_sock, &socksSet)) { return writtenLen; //Timeout -- FIXME should we return -1 or writtenLength ? } ret = ::sendto(m_sock, data + writtenLen, length - writtenLen, 0, (const struct sockaddr *)&remoteHost, sizeof(remoteHost)); if( ret > 0) { writtenLen += ret; continue; } 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( m_sock < 0 ) { return -1; } struct sockaddr_in remoteHost; //Populate m_remoteHost std::memset(&remoteHost, 0, sizeof(struct sockaddr_in)); socklen_t remoteHostLen = sizeof(remoteHost); size_t readLen = 0; struct timeval t_val; //t_val will be decremented on each call to select() t_val.tv_sec = timeout / 1000; t_val.tv_usec = (timeout - (t_val.tv_sec * 1000)) * 1000; //No loop here as we don't want to mix packets from different sources do { //Wait for socket to be readable //Creating FS set fd_set socksSet; FD_ZERO(&socksSet); FD_SET(m_sock, &socksSet); int ret = ::select(FD_SETSIZE, &socksSet, NULL, NULL, &t_val); if(ret <= 0 || !FD_ISSET(m_sock, &socksSet)) { break; //Timeout -- FIXME should we return -1 or writtenLength ? } ret = ::recvfrom(m_sock, data + readLen, length - readLen, 0, (struct sockaddr*)&remoteHost, &remoteHostLen); if( ret > 0) { readLen += ret; } else if( ret == 0 ) { //Connection was closed by server -- FIXME how do we signal that the connection was closed ? //Continue and populate address } else { return -1; //Connection error } } while(0); static char hostBuf[16]; inet_ntoa_r(remoteHost.sin_addr, hostBuf, sizeof(hostBuf)); *host = hostBuf; *port = ntohs(remoteHost.sin_port); return readLen; } int UDPSocket::close() { if( m_sock < 0 ) { return -1; } ::close(m_sock); m_sock = -1; return 0; } int UDPSocket::init() { if( m_sock != -1 ) { return -1; } m_sock = ::socket(AF_INET, SOCK_DGRAM, 0); //UDP socket if (m_sock < 0) { return -1; //Could not create socket (Out of memory / available descriptors) } return 0; }