Diff: TCPSocketConnection.cpp

Revision:

3:e6474399e057

Child:

4:75988d748e4d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TCPSocketConnection.cpp	Wed Jul 25 14:59:37 2012 +0000
@@ -0,0 +1,146 @@
+/* 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 "TCPSocketConnection.h"
+#include <cstring>
+
+using std::memset;
+using std::memcpy;
+
+TCPSocketConnection::TCPSocketConnection() :
+        _closedByRemoteHost(false) {
+    memset(&_remoteHost, 0, sizeof(struct sockaddr_in));
+    _ipAddress[0] = '\0';
+}
+
+int TCPSocketConnection::connect(char* host, int port) {
+    if (init(SOCK_STREAM) < 0)
+        return -1;
+    
+    //Resolve DNS address or populate hard-coded IP address
+    struct hostent *server = gethostbyname(host);
+    if (server == NULL)
+        return -1; //Could not resolve address
+    
+    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);
+    if (lwip_connect(_sock_fd, (const struct sockaddr *) &_remoteHost, sizeof(_remoteHost)) < 0) {
+        close();
+        return -1;
+    }
+    
+    return 0;
+}
+
+int TCPSocketConnection::send(char* data, int length, int timeout) {
+    if ((_sock_fd < 0) || _closedByRemoteHost)
+        return -1;
+    
+    set_timeout(timeout);
+    if (wait_writable() != 0)
+        return -1;
+    
+    int n = lwip_send(_sock_fd, data, length, 0);
+    _closedByRemoteHost = (n == 0);
+    
+    return n;
+}
+
+// -1 if unsuccessful, else number of bytes written
+int TCPSocketConnection::send_all(char* data, int length, int timeout) {
+    if ((_sock_fd < 0) || _closedByRemoteHost)
+        return -1;
+    
+    size_t writtenLen = 0;
+    set_timeout(timeout);
+    while (writtenLen < length) {
+        // Wait for socket to be writeable
+        if (wait_writable() != 0)
+            return writtenLen; //Timeout -- FIXME should we return -1 or writtenLength ?
+        
+        int ret = lwip_send(_sock_fd, data + writtenLen, length - writtenLen, 0);
+        if (ret > 0) {
+            writtenLen += ret;
+            continue;
+        } else if (ret == 0) {
+            _closedByRemoteHost = true;
+            return writtenLen; //Connection was closed by remote host -- FIXME how do we signal that the connection was closed ?
+        } else {
+            return -1; //Connnection error
+        }
+    }
+    
+    return writtenLen;
+}
+
+int TCPSocketConnection::receive(char* data, int length, int timeout) {
+    if ((_sock_fd < 0) || _closedByRemoteHost)
+        return -1;
+    
+    set_timeout(timeout);
+    if (wait_readable() != 0)
+        return -1;
+    
+    int n = lwip_recv(_sock_fd, data, length, 0);
+    _closedByRemoteHost = (n == 0);
+    
+    return n;
+}
+
+// -1 if unsuccessful, else number of bytes received
+int TCPSocketConnection::receive_all(char* data, int length, int timeout) {
+    if ((_sock_fd < 0) || _closedByRemoteHost)
+        return -1;
+    
+    size_t readLen = 0;
+    set_timeout(timeout);
+    while (readLen < length) {
+        //Wait for socket to be readable
+        if (wait_readable() != 0)
+            return readLen; //Timeout -- FIXME should we return -1 or writtenLength ?
+        
+        int ret = lwip_recv(_sock_fd, data + readLen, length - readLen, 0);
+        if (ret > 0) {
+            readLen += ret;
+        } else if (ret == 0) {
+            _closedByRemoteHost = true;
+            return readLen; //Connection was closed by remote host -- FIXME how do we signal that the connection was closed ?
+        } else {
+            return -1; //Connnection error
+        }
+    }
+    return readLen;
+}
+
+char* TCPSocketConnection::get_address() {
+    if (_ipAddress[0] == '\0') {
+        if (_remoteHost.sin_addr.s_addr == 0)
+            return NULL;
+        inet_ntoa_r(_remoteHost.sin_addr, _ipAddress, sizeof(_ipAddress));
+    }
+    return _ipAddress;
+}
+int   TCPSocketConnection::get_port() {
+    return ntohs(_remoteHost.sin_port);
+}
+
+TCPSocketConnection::~TCPSocketConnection() {
+    close(); //Don't want to leak 
+}