Miscellany

#include <sstream>#include <string>#include <stdlib.h>#include <sys/socket.h>#include <stdio.h>#include <unistd.h>#include <netdb.h>#include <iostream>#include <fstream>#include "websvc.h"using namespace std;const unsigned short PORT = 6021;const char* SPACE = " ";const char GET[] = "GET";const char OKAY[] = "200 OKAY\r\nServer: <apache>\r\nContent-type: text/plain\r\n\r\n";const char NOT_FOUND[] = "404 NOT FOUND\r\nServer: <apache>\r\nContent-type: text/html\r\n\r\n";const char INTERNAL[] = "500 INTERNAL SERVER ERROR\r\nServer: <apache>\r\nContent-type: text/plain\r\n\r\n";const char NOT_SUPPORTED[] = "501 NOT IMPLEMENTED\r\nServer: <apache>\r\nContent-type: text/plain\r\n\r\n";int main() {	int service, session;	struct sockaddr_in clientAddress;	socklen_t clientAddressLength = sizeof( clientAddress );	unsigned int clientIpAddress;	unsigned short clientPort;	struct sockaddr_in serverAddress;	char buffer[512];	int filled;	stringstream messageBuffer;	// create socket listener	if( (service = socket( AF_INET, SOCK_STREAM, 0 )) < 0 ) {		perror( "listener creation fail" ); exit(1);	}			// setup the listen socket (specific port)	serverAddress.sin_family = AF_INET;	serverAddress.sin_port = htons(PORT);	serverAddress.sin_addr.s_addr = 0;		// try to bind the socket to the listener so it can listen for connections	if( bind(service, (struct sockaddr *)&serverAddress, sizeof(serverAddress)) < 0 ) {		perror( "bind error" ); exit(1);	}		// start listening	if( listen( service, 1 )  < 0 ) {		perror( "couldnt listen" ); exit(1);	}		printf( "Listening....\n" );		while(true) {		session = accept( service, (struct sockaddr *)&clientAddress, &clientAddressLength );				if( session < 0 ) {			perror( "couldnt accept the connection" ); exit(1);		}				// obtain client's ip address (converted to proper byte order)		clientIpAddress = ntohl( clientAddress.sin_addr.s_addr );		clientPort = ntohs( clientAddress.sin_port );		printf( "Connection request from %x:%d\n", clientIpAddress, clientPort);				filled = read( session, buffer, sizeof( buffer ) - 1 );				// still stuff to read		while( filled > 0 ) {			buffer[filled] = '\0';			messageBuffer << buffer;						filled = read( session, buffer, sizeof( buffer) - 1 );		}			string message = message.str();		string command = strtok(message, SPACE);				if( strcmp(command, GET) != 0 ) {			// got some other command, write a 501			// continue listening			write( session, NOT_SUPPORTED, sizeof(NOT_SUPPORTED) - 1 );			close( session );			continue;		}				string filepath = strtok(message, SPACE);				// clean up the filepath		clean(filepath);				// attempt to open the file and send it		string data;		ifstream in;		in.open(filepath, ios::in);				if(!in) {			// file couldnt be opened, send back an internal error			// continue listening			write(session, INTERNAL, sizeof(INTERNAL) - 1);			close(session);			continue;		}				string line;				write(session, OKAY, sizeof(OKAY) - 1);				while( in.getline(line), in.good() != 0 ) {						// respond with an okay message and write the data			write(session, line, sizeof(line) - 1);  		}				close(session);			}	}void clean(string &path) {	string temp = "";		for(int i = 1; i < path.length(); i++) {				if(path[i] == '%') {			char hex1 = path[i+1];			char hex2 = path[i+2];						char convert[] = {'0','x',hex1,hex2,'\0'};			temp += (char)(strtol(convert, (char **)0, 16));						i+=2;		}		else {			temp += path[i];			}		}		temp[j] = '\0';	path = &temp;}