mbed official / Socket

mbed socket API

Dependents:   EthernetInterface EthernetInterface_RSF EthernetInterface EthernetInterface ... more

Deprecated

This is an mbed 2 sockets library. For mbed 5, network sockets have been revised to better support additional network stacks and thread safety here.

UDPSocket.cpp@3:e6474399e057, 2012-07-25 (annotated)

Committer:
emilmont
Date:
Wed Jul 25 14:59:37 2012 +0000
Revision:
3:e6474399e057
Parent:
2:b227d242f3c7
Child:
5:300e7ad2dc1d
Split TCPSocketServer from TCPSocketConnection

Who changed what in which revision?

UserRevisionLine numberNew contents of line
donatien 0:1f77255a22f5 1 /* Copyright (C) 2012 mbed.org, MIT License
donatien 0:1f77255a22f5 2 *
donatien 0:1f77255a22f5 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
donatien 0:1f77255a22f5 4 * and associated documentation files (the "Software"), to deal in the Software without restriction,
donatien 0:1f77255a22f5 5 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
donatien 0:1f77255a22f5 6 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
donatien 0:1f77255a22f5 7 * furnished to do so, subject to the following conditions:
donatien 0:1f77255a22f5 8 *
donatien 0:1f77255a22f5 9 * The above copyright notice and this permission notice shall be included in all copies or
donatien 0:1f77255a22f5 10 * substantial portions of the Software.
donatien 0:1f77255a22f5 11 *
donatien 0:1f77255a22f5 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
donatien 0:1f77255a22f5 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
donatien 0:1f77255a22f5 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
donatien 0:1f77255a22f5 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
donatien 0:1f77255a22f5 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
donatien 0:1f77255a22f5 17 */
donatien 0:1f77255a22f5 18
donatien 0:1f77255a22f5 19 #include "UDPSocket.h"
donatien 0:1f77255a22f5 20
donatien 0:1f77255a22f5 21 #include <cstring>
donatien 0:1f77255a22f5 22
donatien 0:1f77255a22f5 23 using std::memset;
donatien 0:1f77255a22f5 24
emilmont 3:e6474399e057 25 UDPSocket::UDPSocket() {
donatien 0:1f77255a22f5 26 }
donatien 0:1f77255a22f5 27
emilmont 3:e6474399e057 28 // Server initialization
emilmont 3:e6474399e057 29 int UDPSocket::bind(int port) {
emilmont 3:e6474399e057 30 if (init(SOCK_DGRAM) < 0)
emilmont 3:e6474399e057 31 return -1;
emilmont 3:e6474399e057 32
emilmont 3:e6474399e057 33 struct sockaddr_in localHost;
emilmont 3:e6474399e057 34 std::memset(&localHost, 0, sizeof(localHost));
emilmont 3:e6474399e057 35
emilmont 3:e6474399e057 36 localHost.sin_family = AF_INET;
emilmont 3:e6474399e057 37 localHost.sin_port = htons(port);
emilmont 3:e6474399e057 38 localHost.sin_addr.s_addr = INADDR_ANY;
emilmont 3:e6474399e057 39
emilmont 3:e6474399e057 40 if (lwip_bind(_sock_fd, (const struct sockaddr *) &localHost, sizeof(localHost)) < 0) {
emilmont 3:e6474399e057 41 close();
emilmont 3:e6474399e057 42 return -1;
emilmont 3:e6474399e057 43 }
emilmont 3:e6474399e057 44
emilmont 3:e6474399e057 45 return 0;
donatien 0:1f77255a22f5 46 }
donatien 0:1f77255a22f5 47
donatien 0:1f77255a22f5 48 // -1 if unsuccessful, else number of bytes written
emilmont 3:e6474399e057 49 int UDPSocket::sendTo(char* data, int length, char* host, int port, int timeout) {
emilmont 3:e6474399e057 50 if (_sock_fd < 0)
emilmont 3:e6474399e057 51 return -1;
emilmont 3:e6474399e057 52
emilmont 3:e6474399e057 53 struct sockaddr_in remoteHost;
emilmont 3:e6474399e057 54
emilmont 3:e6474399e057 55 //Populate m_remoteHost
emilmont 3:e6474399e057 56 std::memset(&remoteHost, 0, sizeof(struct sockaddr_in));
emilmont 3:e6474399e057 57
emilmont 3:e6474399e057 58 //Resolve DNS address or populate hard-coded IP address
emilmont 3:e6474399e057 59 struct hostent *server = ::gethostbyname(host);
emilmont 3:e6474399e057 60 if (server == NULL) {
emilmont 3:e6474399e057 61 return -1; //Could not resolve address
donatien 0:1f77255a22f5 62 }
emilmont 3:e6474399e057 63 std::memcpy((char*) &remoteHost.sin_addr.s_addr,
emilmont 3:e6474399e057 64 (char*) server->h_addr_list[0], server->h_length);
emilmont 3:e6474399e057 65
emilmont 3:e6474399e057 66 remoteHost.sin_family = AF_INET;
emilmont 3:e6474399e057 67 remoteHost.sin_port = htons(port);
emilmont 3:e6474399e057 68
emilmont 3:e6474399e057 69 size_t writtenLen = 0;
emilmont 3:e6474399e057 70 set_timeout(timeout);
emilmont 3:e6474399e057 71 while (writtenLen < length) {
emilmont 3:e6474399e057 72 //Wait for socket to be writeable
emilmont 3:e6474399e057 73 //Creating FS set
emilmont 3:e6474399e057 74 if (wait_writable() != 0)
emilmont 3:e6474399e057 75 return writtenLen; //Timeout -- FIXME should we return -1 or writtenLength ?
emilmont 3:e6474399e057 76
emilmont 3:e6474399e057 77 int ret = lwip_sendto(_sock_fd, data + writtenLen, length - writtenLen, 0,
emilmont 3:e6474399e057 78 (const struct sockaddr *) &remoteHost, sizeof(remoteHost));
emilmont 3:e6474399e057 79 if (ret > 0) {
emilmont 3:e6474399e057 80 writtenLen += ret;
emilmont 3:e6474399e057 81 } else if (ret == 0) {
emilmont 3:e6474399e057 82 return writtenLen; //Connection was closed by server -- FIXME how do we signal that the connection was closed ?
emilmont 3:e6474399e057 83 } else {
emilmont 3:e6474399e057 84 return -1; //Connnection error
emilmont 3:e6474399e057 85 }
donatien 0:1f77255a22f5 86 }
emilmont 3:e6474399e057 87
emilmont 3:e6474399e057 88 return writtenLen;
donatien 0:1f77255a22f5 89 }
donatien 0:1f77255a22f5 90
donatien 0:1f77255a22f5 91 // -1 if unsuccessful, else number of bytes received
emilmont 3:e6474399e057 92 int UDPSocket::receiveFrom(char* data, int length, char** host, int* port, int timeout) {
emilmont 3:e6474399e057 93 if (_sock_fd < 0)
emilmont 3:e6474399e057 94 return -1;
emilmont 3:e6474399e057 95
emilmont 3:e6474399e057 96 set_timeout(timeout);
emilmont 3:e6474399e057 97 if (wait_readable() != 0)
emilmont 3:e6474399e057 98 return -1;
emilmont 3:e6474399e057 99
emilmont 3:e6474399e057 100 struct sockaddr_in remoteHost;
emilmont 3:e6474399e057 101 std::memset(&remoteHost, 0, sizeof(struct sockaddr_in));
donatien 0:1f77255a22f5 102
emilmont 3:e6474399e057 103 socklen_t remoteHostLen = sizeof(remoteHost);
emilmont 3:e6474399e057 104 int n = lwip_recvfrom(_sock_fd, data, length, 0, (struct sockaddr*) &remoteHost, &remoteHostLen);
emilmont 3:e6474399e057 105 if (n < 0)
emilmont 3:e6474399e057 106 return -1;
emilmont 3:e6474399e057 107
emilmont 3:e6474399e057 108 static char hostBuf[16];
emilmont 3:e6474399e057 109 inet_ntoa_r(remoteHost.sin_addr, hostBuf, sizeof(hostBuf));
emilmont 3:e6474399e057 110
emilmont 3:e6474399e057 111 *host = hostBuf;
emilmont 3:e6474399e057 112 *port = ntohs(remoteHost.sin_port);
emilmont 3:e6474399e057 113
emilmont 3:e6474399e057 114 return n;
donatien 0:1f77255a22f5 115 }
donatien 0:1f77255a22f5 116
emilmont 3:e6474399e057 117 UDPSocket::~UDPSocket() {
emilmont 3:e6474399e057 118 close(); //Don't want to leak
donatien 0:1f77255a22f5 119 }