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+ /*******************************************************************************
+ * File: MySock.cpp *
+ * Version: 0.2 *
+ * Date: 20081002 *
+ * Author: Gaspar Fernández (helyo@totaki.com) *
+ * *
+ * Copyright (C) 2008 Gaspar Fernández *
+ * *
+ * This program is free software: you can redistribute it and/or modify *
+ * it under the terms of the GNU General Public License as published by *
+ * the Free Software Foundation, either version 3 of the License, or *
+ * (at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU General Public License *
+ * along with this program. If not, see <http://www.gnu.org/licenses/>. *
+ * *
+ ********************************************************************************
+ * Description:
+ * Class and functions to create socket connections and fetch information
+ * from http servers. It is part of another project I'm in. (Some comments are
+ * in Spanish.
+ *
+ * Change History:
+ * Date Author Modification
+ * 10.02.2008 Gaspar Fernández Initial release
+ * 31.10.2010 Gaspar Fernández Bug Corrections
+ ********************************************************************************/
+#include "MySock.h"
+
+/*************************************************************
+ * Function: extract_key_value *
+ *************************************************************
+ * Description: *
+ * Extract information separated with a white space. *
+ * We consider KEY before the whitespace and VALUE *
+ * after that. *
+ * *
+ * Input: *
+ * string str - String containing the relation *
+ * *
+ * Output: *
+ * TKey_Value struct containing separated key and value. *
+ * *
+ * Change History: *
+ * Date Author Modification *
+ * *
+ *************************************************************/
+TKey_Value extract_key_value(string str)
+{
+ TKey_Value data;
+ char buf[512]; // Max characters
+ try // Sólo si es posible
+ {
+ sscanf(str.data(), "%s", buf); // Extract header
+ data.value=str.substr(strlen(buf));
+ data.key=buf;
+ }
+ catch(exception& e)
+ {
+ // Do nothing
+ }
+ return data;
+}
+
+/*************************************************************
+ * Constructor MySock() *
+ *************************************************************
+ * Description: *
+ * Creates MySock class and initialize it. The second *
+ * constructor uses an HTTP URI to read information stored *
+ * there. *
+ * *
+ * Input: *
+ * string uri (in the second one) *
+ * *
+ * Change History: *
+ * Date Author Modification *
+ * *
+ *************************************************************/
+MySock::MySock()
+{
+ this->error=NO_ERROR;
+ this->connected=false;
+}
+
+MySock::MySock(string uri)
+{
+ int port;
+ string host;
+ string params;
+ string protostr;
+ string req;
+ this->error=NO_ERROR;
+
+ string::size_type pos = uri.find("//", 0);
+ string::size_type pos2;
+
+ if ((pos!=string::npos) && (pos==uri.find("/", 0)) && (pos>0)) // Sin barras antes
+ {
+ protostr = uri.substr(0,(pos-1));
+ if (protostr=="http")
+ {
+ port=80;
+ pos2=uri.find("/", (pos+2));
+ if (pos2==string::npos)
+ pos2=uri.length();
+ host=uri.substr(pos+2, pos2-pos-2);
+ params=uri.substr(pos2);
+
+ this->MakeConnection(host, port);
+ req="GET "+params+" HTTP/1.0"+CRLF+
+ "Host: "+host+"\r\n"+
+ CRLF;
+ if (this->connected)
+ this->SendData(req);
+ }
+ else
+ {
+ this->error=NO_VALID_PROTOCOL;
+ }
+ }
+ else
+ this->error=NO_VALID_PROTOCOL;
+}
+
+/*************************************************************
+ * Constructor MySock() *
+ *************************************************************
+ * Description: *
+ * Creates MySock class and initialize it. Connect with *
+ * a remote server using specified port. *
+ * *
+ * Input: *
+ * string server - Server to connect to *
+ * int port - Port in the remote server *
+ * *
+ * Change History: *
+ * Date Author Modification *
+ * *
+ *************************************************************/
+MySock::MySock(string server, int port)
+{
+ this->MakeConnection(server, port);
+}
+
+/*************************************************************
+ * Method: MakeConnection() *
+ *************************************************************
+ * Description: *
+ * Makes a connection to an specified server using a *
+ * remote port *
+ * *
+ * Input: *
+ * string server *
+ * int port *
+ * *
+ * Output: *
+ * Nothing *
+ * *
+ * Change History: *
+ * Date Author Modification *
+ * *
+ *************************************************************/
+void MySock::MakeConnection(string server, int port)
+{
+ struct sockaddr_in serverAddress;
+ struct hostent *hostInfo;
+ this->connected=false;
+ this->error=NO_ERROR;
+ hostInfo = gethostbyname(server.data());
+ this->error=(hostInfo==NULL)?CANT_RESOLVE_HOST:NO_ERROR;
+ if (this->error==0)
+ {
+ this->sockd = socket(AF_INET, SOCK_STREAM, 0);
+ this->error = (this->sockd<0)?CANT_CREATE_SOCKET:NO_ERROR;
+ }
+
+ // Connect to server. First we have to set some fields in the
+ // serverAddress structure. The system will assign me an arbitrary
+ // local port that is not in use.
+ if (this->error==0)
+ {
+ serverAddress.sin_family = hostInfo->h_addrtype;
+ memcpy((char *) &serverAddress.sin_addr.s_addr,
+ hostInfo->h_addr_list[0], hostInfo->h_length);
+ serverAddress.sin_port = htons(port);
+
+ this->error= (connect(this->sockd,
+ (struct sockaddr *) &serverAddress,
+ sizeof(serverAddress)) < 0)?CANT_CONNECT:NO_ERROR;
+ }
+ this->connected=(error==NO_ERROR);
+}
+
+/*************************************************************
+ * Method: SendData() *
+ *************************************************************
+ * Description: *
+ * Sends information through the already stablished *
+ * connection. *
+ * *
+ * Input: *
+ * string data - Data being sent *
+ * *
+ * Output: *
+ * Nothing *
+ * *
+ * Change History: *
+ * Date Author Modification *
+ * *
+ *************************************************************/
+int MySock::SendData(string data)
+{
+ if (this->error==0)
+ this->error = (write(this->sockd,data.data(),strlen(data.data()))<0)?CANT_SEND_DATA:NO_ERROR;
+ return this->error;
+}
+
+/*************************************************************
+ * Method: GetTextData() *
+ *************************************************************
+ * Description: *
+ * Read received data *
+ * *
+ * Input: *
+ * Nothing *
+ * *
+ * Output: *
+ * string - returns data received. *
+ * *
+ * Change History: *
+ * Date Author Modification *
+ * *
+ *************************************************************/
+string MySock::GetTextData()
+{
+ int n;
+ char buffer[1024];
+ string out("");
+
+ if (this->error==0)
+ {
+
+ bzero(buffer,1024);
+ while ((n=read(this->sockd,buffer,1023)>0))
+ {
+ if (n>=0)
+ out+=buffer;
+ else
+ {
+ error=CANT_READ_DATA;
+ break;
+ }
+ bzero(buffer,1024);
+ }
+ return out;
+ }
+ return NULL;
+}
+
+
+/*************************************************************
+ * Method: GetHTTPData() *
+ *************************************************************
+ * Description: *
+ * We connect to an HTTP server and We Want to Read and *
+ * identify headers and contents. We use this function *
+ * *
+ * Input: *
+ * Nothing *
+ * *
+ * Output: *
+ * HTTP_Request structure - Returns headers and data *
+ * *
+ * Change History: *
+ * Date Author Modification *
+ * *
+ *************************************************************/
+HTTP_Request *MySock::GetHTTPData()
+{
+ string txtData;
+ int i=0; // Cuenta líneas
+ string::size_type pos, pos2;
+ HTTP_Request *http;
+ string header;
+ string value;
+ bool err, data;
+ char buf[255], buf2[255];
+ TKey_Value hdata;
+
+ if (this->error==NO_ERROR)
+ {
+ txtData=this->GetTextData();
+ // Close the socket, we will analyze data
+ this->closeConnection();
+
+ data=false;
+ err=false;
+ pos=0;
+ http=new HTTP_Request;
+ while ((!data) && (!err))
+ {
+ pos2=txtData.find("\r\n",pos);
+ if (pos2==string::npos)
+ err=true;
+ else if (pos2==pos)
+ data=true;
+ else
+ {
+ header=txtData.substr(pos,pos2-pos);
+// cout<<header<<"*"<<endl;
+ if (i==0)
+ {
+ http->statusstr=header;
+ sscanf(header.data(),"%s %s", buf, buf2); // HTTP/1.0 200
+ http->status=atoi(buf2);
+ }
+ else
+ {
+ hdata=extract_key_value(header);
+ if (hdata.key=="Date:")
+ http->date=hdata.value;
+ else if (hdata.key=="Server: ")
+ http->server=hdata.value;
+ else if (hdata.key=="Last-Modified")
+ http->last_modified=hdata.value;
+ else if (hdata.key=="Content-Type")
+ http->content_type=hdata.value;
+ else if (hdata.key=="Content-Length")
+ http->content_length=hdata.value;
+ }
+ pos=pos2+2;
+ i++;
+ }
+
+ }
+ if (err)
+ {
+ this->error=NO_VALID_HEADERS;
+ return NULL;
+ }
+ else
+ http->data=txtData.substr(pos2+2); // Skip \r\n
+
+ return http;
+ }
+ return NULL;
+}
+
+void MySock::closeConnection()
+{
+ if (connected)
+ {
+ close(sockd);
+ connected=false;
+ }
+}
+
+MySock::~MySock()
+{
+ closeConnection();
+}
+// It is a test function to use MySock class. It was written for DWGO
+// int main(int argc, char *argv[])
+// {
+
+// string servidor;
+// MySock sock;
+// int portno;
+// HTTP_Request *http;
+
+// if (argc < 3) {
+// fprintf(stderr,"usage %s hostname port\n", argv[0]);
+// exit(0);
+// }
+// portno = atoi(argv[2]);
+// servidor=argv[1];
+// // sock = MySock(servidor, portno);
+// // sock.SendData("GET /pub/data/observations/metar/decoded/LEMG.TXT HTTP/1.0\n\n");
+
+// // cout<<sock.GetTextData();
+
+// sock = MySock("http://weather.noaa.gov/pub/data/observations/metar/decoded/LEMG.TXT");
+// // cout<<"Error: "<<sock.error;
+// http=sock.GetHTTPData();
+// if (http==NULL)
+// cout<<"HUBO UN FALLO";
+// else
+// cout<<"Stado: "<<http->status<<"Fecha: "<<http->date<<endl<<"DATA:"<<http->data;
+// return 0;
+// }
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