Programming Forums > Application Development > C++

Brent · May 20th, 2006, 5:08 PM

I created a webserver using C++ and winsock.
all its supposed to do is startup and send a message to any internet browser that connects to it.It compiled fine but when I try to connect to it, nothing is displayed on the internet browser, it just continues to load but never loads. Could someone help me sort this out. I am using a open watcom compiler on Windows xp.

here's the code:

(Toggle Plain Text)

#include<winsock2.h>
#include<iostream.h>
#include<fstream.h>
#include<string.h> 
#pragma comment(lib,"wsock32.lib")



SOCKET client;
SOCKET server;	


char file[50];
char send_file[5000];
char *str_file;
char *file_dir;
int a;
ifstream infile;
	
int main()
{
	WORD sockversion;
	WSADATA wsaData;
	int net;
	
	sockversion=MAKEWORD(2,2);
	WSAStartup(sockversion,&wsaData);
	
	

	
	server=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
	if(server==INVALID_SOCKET)
	{
		cout<<"invalid socket\n";
		WSACleanup();
		return 0;
	}
	
	sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(80);
	sin.sin_addr.s_addr=INADDR_ANY;
	
	net=bind(server,(LPSOCKADDR)&sin,sizeof(sin));
	if(net==SOCKET_ERROR)
	{
		cout<<"failed bind\n";
		WSACleanup();
		return 0;
	}
	
	if((net=listen(server,4))!=SOCKET_ERROR)
	{
		while(true)
		{
			client=accept(server,NULL,NULL);
			if(client==INVALID_SOCKET)
			{
				cout<<"error accepting connection\n";
			}
			else
			{
				cout<<"client connected\n";
			}
			
			
			
			

			char string[512]="<html><body><h1>Welcome, webserver is under 

construction</h1></body></html>\n";
				
			send(server,"HTTP/1.1",512,0);
			send(server,string,sizeof(string),0);
			send(server,"Accept: image/jpeg ",512,0);
			send(server,"Accept-Language: es",512,0);
			send(server,"Accept-Encoding: gzip",512,0);
			send(server,"User-Agent: MSIE 6.0",512,0);
			send(server,"Host: 127.0.0.1",512,0);
			send(server,"Server: brentserver (windows)",512,0);
			send(server,"Connection:  close",512,0);
			send(server,"Content-Type: text/html",1024,0);
			send(server,"Content-Length: 1024",512,0);
			
				
					
				
		}
	}
	else
	{
		cout<<"failed listen\n";
		WSACleanup();
		closesocket(client);
		closesocket(server);
	}
	WSACleanup();
	closesocket(client);
	return 0;
}

sorry about the indentations, my code editor is a pain to deal with.

nnxion · May 20th, 2006, 6:42 PM

First thing to do is get another compiler, I think you are having a problem with your sending in the right order. I don't know it so try a small serach but try something like:

(Toggle Plain Text)

#include <winsock2.h>
#include <iostream>
#pragma comment(lib,"wsock32.lib")

using namespace std;

SOCKET client;
SOCKET server;

int main()
{
	WSADATA wsaData;

	WORD sockversion = MAKEWORD(2,2);
	WSAStartup(sockversion,&wsaData);

	server = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
	if(server == INVALID_SOCKET)
	{
		cout << "Invalid socket\n";
		WSACleanup();
		return 0;
	}

	sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(80);
	sin.sin_addr.s_addr = INADDR_ANY;

	int net = bind(server, (LPSOCKADDR)&sin, sizeof(sin));
	if(net == SOCKET_ERROR)
	{
		cout << "Failed bind\n";
		WSACleanup();
		return 0;
	}

	if((net = listen(server, 4)) != SOCKET_ERROR)
	{
		while(true)
		{
			client = accept(server, NULL, NULL);
			if(client == INVALID_SOCKET)
			{
				cout << "Error accepting connection\n";
			}
			else
			{
				cout << "Client connected\n";
			}

			string message = "<html><body><h1>Welcome, webserver is under construction</h1></body></html>";

			send(server, "HTTP/1.1", 512, 0);
			send(server, "Accept: image/jpeg ", 512, 0);
			send(server, "Accept-Language: en", 512, 0);
			send(server, "Accept-Encoding: gzip", 512, 0);
			send(server, "User-Agent: MSIE 6.0", 512, 0);
			send(server, "Host: 127.0.0.1", 512, 0);
			send(server, "Server: server (windows)", 512, 0);
			send(server, "Connection:  close", 512, 0);
			send(server, "Content-Type: text/html", 1024, 0);
			send(server, "Content-Length: 1024", 512, 0);

		}
	}
	else
	{
		cout << "Failed listen\n";
		WSACleanup();
		closesocket(client);
		closesocket(server);
	}
	WSACleanup();
	closesocket(client);
	return 0;
}

Brent · May 20th, 2006, 7:53 PM

ok thanks, i just got Visual C++ express, maybe it will work a little better

The Dark · May 20th, 2006, 9:56 PM

(Toggle Plain Text)

send(server,"HTTP/1.1",512,0);

This will send "HTTP/1.1" and then 504 bytes of potential garbage. You also need to send back the actual status code and have a carriage return + line feed after each line

(Toggle Plain Text)

send(server, "HTTP/1.x 200 OK\r\n", 17);

You also need to send the HTML after the headers, not in the middle of them. You need to return a blank line after the headers to indicate there is no more headers.

grumpy · May 21st, 2006, 2:29 AM

Quote:

Originally Posted by The Dark

(Toggle Plain Text)

send(server,"HTTP/1.1",512,0);

This will send "HTTP/1.1" and then 504 bytes of potential garbage. You also need to send back the actual status code and have a carriage return + line feed after each line

(Toggle Plain Text)

send(server, "HTTP/1.x 200 OK\r\n", 17);

Rather than hardcoding the length, do something a bit more general purpos, such as;

(Toggle Plain Text)

void SendIt(SOCKET server, const char *line)
{
   if (line != NULL)
   {
         int length = (int)strlen(line);   // do NOT compute sizeof(line) here
         if (length > 0) send(socket, line, length);
   }
}

// and to call it

SendIt(server, "HTTP/1.x 200 OK\r\n");

nnxion · May 21st, 2006, 11:23 AM

Grumpy, it's okay to use C++ in the C++ forum. :p

@OP: Here you go:

(Toggle Plain Text)

#include <iostream>
#include <sstream>
#include <winsock2.h>

#pragma comment(lib, "wsock32.lib")

using namespace std;

SOCKET client;
SOCKET server;

void SendIt(SOCKET socket, string line)
{
         int length = (int)line.length();
         if (length > 0)
         	send(socket, line.c_str(), length, 0);
}

int main()
{
	WSADATA wsaData;

	WORD sockversion = MAKEWORD(2, 2);
	WSAStartup(sockversion, &wsaData);

	server = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
	if(server == INVALID_SOCKET)
	{
		cerr << "Invalid socket" << endl;
		WSACleanup();
		return 0;
	}

	sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(80);
	sin.sin_addr.s_addr = INADDR_ANY;

	int net = bind(server, (LPSOCKADDR)&sin, sizeof(sin));
	if(net == SOCKET_ERROR)
	{
		cout << "Failed bind" << endl;
		WSACleanup();
		return 0;
	}

	if((net = listen(server, 4)) != SOCKET_ERROR)
	{
		while(true)
		{
			client = accept(server, NULL, NULL);
			if(client == INVALID_SOCKET)
			{
				cerr << "Error accepting connection" << endl;
			}
			else
			{
				cerr << "Client connected" << endl;
			}

			string message = "<html><body><h1>Welcome, webserver is under construction</h1></body></html>";
			std::ostringstream streamLength;
			streamLength << message.length();

			SendIt(client, "HTTP/1.1 200 OK\r\n");
			SendIt(client, "Date: Sun, 22 May 2006 14:58:00 GMT\r\n");
			SendIt(client, "Server: webserver 0.0001\r\n");
			SendIt(client, "Content-Type: text/html; charset=iso-8859-1\r\n");
			SendIt(client, "Content-Length: ");
			SendIt(client, streamLength.str());
			SendIt(client, "\r\n");
			SendIt(client, "Connection: close\r\n");

			// blank line for end of headers
			SendIt(client, "\r\n");
			SendIt(client, message.c_str());
			closesocket(client);
		}
	}
	else
	{
		cerr << "Failed listen" << endl;
		WSACleanup();
		closesocket(client);
		closesocket(server);
	}
	WSACleanup();
	closesocket(server);
	return 0;
}

Brent · May 21st, 2006, 4:51 PM

wow, thanks for all the help

Brent · May 21st, 2006, 5:27 PM

ok, i used the code nnixion gave me, it compiles fine, but the page wont load, and i get this on the server screen:

(Toggle Plain Text)

GET / HTTP/1.1
Accept: */*
Accept-Language: es
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0
.50727)
Host: 127.0.0.1
Connection: Keep-Alive

any suggestions

The Dark · May 21st, 2006, 5:30 PM

Quote:

Originally Posted by grumpy

Rather than hardcoding the length, do something a bit more general purpos, such as;

I just wanted to show why his server wasn't returning anything valid, rather than confuse him with a whole new function.

nnxion · May 21st, 2006, 6:24 PM

Quote:

Originally Posted by Brent

any suggestions

Hmm yeah, I was closing the client socket, after I sent the headers and body.
I got a weird effect from it though, in Firefox it worked fine, in Opera it worked most of the time, and in IE it worked some of the time.

I suggest reading this.

May 20th, 2006, 5:08 PM	#1
Brent Highly Adaptive Penguin Join Date: May 2005 Location: United States Posts: 252 Rep Power: 4	C++ webserver trouble I created a webserver using C++ and winsock. all its supposed to do is startup and send a message to any internet browser that connects to it.It compiled fine but when I try to connect to it, nothing is displayed on the internet browser, it just continues to load but never loads. Could someone help me sort this out. I am using a open watcom compiler on Windows xp. here's the code: (Toggle Plain Text) #include<winsock2.h> #include<iostream.h> #include<fstream.h> #include<string.h> #pragma comment(lib,"wsock32.lib") SOCKET client; SOCKET server; char file[50]; char send_file[5000]; char str_file; char file_dir; int a; ifstream infile; int main() { WORD sockversion; WSADATA wsaData; int net; sockversion=MAKEWORD(2,2); WSAStartup(sockversion,&wsaData); server=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP); if(server==INVALID_SOCKET) { cout<<"invalid socket\n"; WSACleanup(); return 0; } sockaddr_in sin; sin.sin_family=AF_INET; sin.sin_port=htons(80); sin.sin_addr.s_addr=INADDR_ANY; net=bind(server,(LPSOCKADDR)&sin,sizeof(sin)); if(net==SOCKET_ERROR) { cout<<"failed bind\n"; WSACleanup(); return 0; } if((net=listen(server,4))!=SOCKET_ERROR) { while(true) { client=accept(server,NULL,NULL); if(client==INVALID_SOCKET) { cout<<"error accepting connection\n"; } else { cout<<"client connected\n"; } char string[512]="<html><body><h1>Welcome, webserver is under construction</h1></body></html>\n"; send(server,"HTTP/1.1",512,0); send(server,string,sizeof(string),0); send(server,"Accept: image/jpeg ",512,0); send(server,"Accept-Language: es",512,0); send(server,"Accept-Encoding: gzip",512,0); send(server,"User-Agent: MSIE 6.0",512,0); send(server,"Host: 127.0.0.1",512,0); send(server,"Server: brentserver (windows)",512,0); send(server,"Connection: close",512,0); send(server,"Content-Type: text/html",1024,0); send(server,"Content-Length: 1024",512,0); } } else { cout<<"failed listen\n"; WSACleanup(); closesocket(client); closesocket(server); } WSACleanup(); closesocket(client); return 0; } #include<winsock2.h> #include<iostream.h> #include<fstream.h> #include<string.h> #pragma comment(lib,"wsock32.lib") SOCKET client; SOCKET server; char file[50]; char send_file[5000]; char str_file; char file_dir; int a; ifstream infile; int main() { WORD sockversion; WSADATA wsaData; int net; sockversion=MAKEWORD(2,2); WSAStartup(sockversion,&wsaData); server=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP); if(server==INVALID_SOCKET) { cout<<"invalid socket\n"; WSACleanup(); return 0; } sockaddr_in sin; sin.sin_family=AF_INET; sin.sin_port=htons(80); sin.sin_addr.s_addr=INADDR_ANY; net=bind(server,(LPSOCKADDR)&sin,sizeof(sin)); if(net==SOCKET_ERROR) { cout<<"failed bind\n"; WSACleanup(); return 0; } if((net=listen(server,4))!=SOCKET_ERROR) { while(true) { client=accept(server,NULL,NULL); if(client==INVALID_SOCKET) { cout<<"error accepting connection\n"; } else { cout<<"client connected\n"; } char string[512]="<html><body><h1>Welcome, webserver is under construction</h1></body></html>\n"; send(server,"HTTP/1.1",512,0); send(server,string,sizeof(string),0); send(server,"Accept: image/jpeg ",512,0); send(server,"Accept-Language: es",512,0); send(server,"Accept-Encoding: gzip",512,0); send(server,"User-Agent: MSIE 6.0",512,0); send(server,"Host: 127.0.0.1",512,0); send(server,"Server: brentserver (windows)",512,0); send(server,"Connection: close",512,0); send(server,"Content-Type: text/html",1024,0); send(server,"Content-Length: 1024",512,0); } } else { cout<<"failed listen\n"; WSACleanup(); closesocket(client); closesocket(server); } WSACleanup(); closesocket(client); return 0; } sorry about the indentations, my code editor is a pain to deal with.

May 20th, 2006, 6:42 PM	#2
nnxion Programming Guru Join Date: Jun 2005 Location: elemental plane Posts: 1,429 Rep Power: 5	First thing to do is get another compiler, I think you are having a problem with your sending in the right order. I don't know it so try a small serach but try something like: (Toggle Plain Text) #include <winsock2.h> #include <iostream> #pragma comment(lib,"wsock32.lib") using namespace std; SOCKET client; SOCKET server; int main() { WSADATA wsaData; WORD sockversion = MAKEWORD(2,2); WSAStartup(sockversion,&wsaData); server = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); if(server == INVALID_SOCKET) { cout << "Invalid socket\n"; WSACleanup(); return 0; } sockaddr_in sin; sin.sin_family = AF_INET; sin.sin_port = htons(80); sin.sin_addr.s_addr = INADDR_ANY; int net = bind(server, (LPSOCKADDR)&sin, sizeof(sin)); if(net == SOCKET_ERROR) { cout << "Failed bind\n"; WSACleanup(); return 0; } if((net = listen(server, 4)) != SOCKET_ERROR) { while(true) { client = accept(server, NULL, NULL); if(client == INVALID_SOCKET) { cout << "Error accepting connection\n"; } else { cout << "Client connected\n"; } string message = "<html><body><h1>Welcome, webserver is under construction</h1></body></html>"; send(server, "HTTP/1.1", 512, 0); send(server, "Accept: image/jpeg ", 512, 0); send(server, "Accept-Language: en", 512, 0); send(server, "Accept-Encoding: gzip", 512, 0); send(server, "User-Agent: MSIE 6.0", 512, 0); send(server, "Host: 127.0.0.1", 512, 0); send(server, "Server: server (windows)", 512, 0); send(server, "Connection: close", 512, 0); send(server, "Content-Type: text/html", 1024, 0); send(server, "Content-Length: 1024", 512, 0); } } else { cout << "Failed listen\n"; WSACleanup(); closesocket(client); closesocket(server); } WSACleanup(); closesocket(client); return 0; } #include <winsock2.h> #include <iostream> #pragma comment(lib,"wsock32.lib") using namespace std; SOCKET client; SOCKET server; int main() { WSADATA wsaData; WORD sockversion = MAKEWORD(2,2); WSAStartup(sockversion,&wsaData); server = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); if(server == INVALID_SOCKET) { cout << "Invalid socket\n"; WSACleanup(); return 0; } sockaddr_in sin; sin.sin_family = AF_INET; sin.sin_port = htons(80); sin.sin_addr.s_addr = INADDR_ANY; int net = bind(server, (LPSOCKADDR)&sin, sizeof(sin)); if(net == SOCKET_ERROR) { cout << "Failed bind\n"; WSACleanup(); return 0; } if((net = listen(server, 4)) != SOCKET_ERROR) { while(true) { client = accept(server, NULL, NULL); if(client == INVALID_SOCKET) { cout << "Error accepting connection\n"; } else { cout << "Client connected\n"; } string message = "<html><body><h1>Welcome, webserver is under construction</h1></body></html>"; send(server, "HTTP/1.1", 512, 0); send(server, "Accept: image/jpeg ", 512, 0); send(server, "Accept-Language: en", 512, 0); send(server, "Accept-Encoding: gzip", 512, 0); send(server, "User-Agent: MSIE 6.0", 512, 0); send(server, "Host: 127.0.0.1", 512, 0); send(server, "Server: server (windows)", 512, 0); send(server, "Connection: close", 512, 0); send(server, "Content-Type: text/html", 1024, 0); send(server, "Content-Length: 1024", 512, 0); } } else { cout << "Failed listen\n"; WSACleanup(); closesocket(client); closesocket(server); } WSACleanup(); closesocket(client); return 0; } __________________ "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for." -- Socrates

May 20th, 2006, 9:56 PM	#4
The Dark Expert Programmer Join Date: Jun 2005 Posts: 893 Rep Power: 4	(Toggle Plain Text) send(server,"HTTP/1.1",512,0); send(server,"HTTP/1.1",512,0); This will send "HTTP/1.1" and then 504 bytes of potential garbage. You also need to send back the actual status code and have a carriage return + line feed after each line (Toggle Plain Text) send(server, "HTTP/1.x 200 OK\r\n", 17); send(server, "HTTP/1.x 200 OK\r\n", 17); You also need to send the HTML after the headers, not in the middle of them. You need to return a blank line after the headers to indicate there is no more headers.

May 21st, 2006, 11:23 AM	#6
nnxion Programming Guru Join Date: Jun 2005 Location: elemental plane Posts: 1,429 Rep Power: 5	Grumpy, it's okay to use C++ in the C++ forum. :p @OP: Here you go: (Toggle Plain Text) #include <iostream> #include <sstream> #include <winsock2.h> #pragma comment(lib, "wsock32.lib") using namespace std; SOCKET client; SOCKET server; void SendIt(SOCKET socket, string line) { int length = (int)line.length(); if (length > 0) send(socket, line.c_str(), length, 0); } int main() { WSADATA wsaData; WORD sockversion = MAKEWORD(2, 2); WSAStartup(sockversion, &wsaData); server = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); if(server == INVALID_SOCKET) { cerr << "Invalid socket" << endl; WSACleanup(); return 0; } sockaddr_in sin; sin.sin_family = AF_INET; sin.sin_port = htons(80); sin.sin_addr.s_addr = INADDR_ANY; int net = bind(server, (LPSOCKADDR)&sin, sizeof(sin)); if(net == SOCKET_ERROR) { cout << "Failed bind" << endl; WSACleanup(); return 0; } if((net = listen(server, 4)) != SOCKET_ERROR) { while(true) { client = accept(server, NULL, NULL); if(client == INVALID_SOCKET) { cerr << "Error accepting connection" << endl; } else { cerr << "Client connected" << endl; } string message = "<html><body><h1>Welcome, webserver is under construction</h1></body></html>"; std::ostringstream streamLength; streamLength << message.length(); SendIt(client, "HTTP/1.1 200 OK\r\n"); SendIt(client, "Date: Sun, 22 May 2006 14:58:00 GMT\r\n"); SendIt(client, "Server: webserver 0.0001\r\n"); SendIt(client, "Content-Type: text/html; charset=iso-8859-1\r\n"); SendIt(client, "Content-Length: "); SendIt(client, streamLength.str()); SendIt(client, "\r\n"); SendIt(client, "Connection: close\r\n"); // blank line for end of headers SendIt(client, "\r\n"); SendIt(client, message.c_str()); closesocket(client); } } else { cerr << "Failed listen" << endl; WSACleanup(); closesocket(client); closesocket(server); } WSACleanup(); closesocket(server); return 0; } #include <iostream> #include <sstream> #include <winsock2.h> #pragma comment(lib, "wsock32.lib") using namespace std; SOCKET client; SOCKET server; void SendIt(SOCKET socket, string line) { int length = (int)line.length(); if (length > 0) send(socket, line.c_str(), length, 0); } int main() { WSADATA wsaData; WORD sockversion = MAKEWORD(2, 2); WSAStartup(sockversion, &wsaData); server = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); if(server == INVALID_SOCKET) { cerr << "Invalid socket" << endl; WSACleanup(); return 0; } sockaddr_in sin; sin.sin_family = AF_INET; sin.sin_port = htons(80); sin.sin_addr.s_addr = INADDR_ANY; int net = bind(server, (LPSOCKADDR)&sin, sizeof(sin)); if(net == SOCKET_ERROR) { cout << "Failed bind" << endl; WSACleanup(); return 0; } if((net = listen(server, 4)) != SOCKET_ERROR) { while(true) { client = accept(server, NULL, NULL); if(client == INVALID_SOCKET) { cerr << "Error accepting connection" << endl; } else { cerr << "Client connected" << endl; } string message = "<html><body><h1>Welcome, webserver is under construction</h1></body></html>"; std::ostringstream streamLength; streamLength << message.length(); SendIt(client, "HTTP/1.1 200 OK\r\n"); SendIt(client, "Date: Sun, 22 May 2006 14:58:00 GMT\r\n"); SendIt(client, "Server: webserver 0.0001\r\n"); SendIt(client, "Content-Type: text/html; charset=iso-8859-1\r\n"); SendIt(client, "Content-Length: "); SendIt(client, streamLength.str()); SendIt(client, "\r\n"); SendIt(client, "Connection: close\r\n"); // blank line for end of headers SendIt(client, "\r\n"); SendIt(client, message.c_str()); closesocket(client); } } else { cerr << "Failed listen" << endl; WSACleanup(); closesocket(client); closesocket(server); } WSACleanup(); closesocket(server); return 0; } __________________ "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for." -- Socrates Last edited by nnxion; May 21st, 2006 at 11:34 AM. Reason: space between comma ;)

May 21st, 2006, 5:27 PM	#8
Brent Highly Adaptive Penguin Join Date: May 2005 Location: United States Posts: 252 Rep Power: 4	ok, i used the code nnixion gave me, it compiles fine, but the page wont load, and i get this on the server screen: (Toggle Plain Text) GET / HTTP/1.1 Accept: / Accept-Language: es Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0 .50727) Host: 127.0.0.1 Connection: Keep-Alive GET / HTTP/1.1 Accept: / Accept-Language: es Accept-Encoding: gzip, deflate User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0 .50727) Host: 127.0.0.1 Connection: Keep-Alive any suggestions

May 20th, 2006, 7:53 PM	#3
Brent Highly Adaptive Penguin Join Date: May 2005 Location: United States Posts: 252 Rep Power: 4	ok thanks, i just got Visual C++ express, maybe it will work a little better

May 21st, 2006, 4:51 PM	#7
Brent Highly Adaptive Penguin Join Date: May 2005 Location: United States Posts: 252 Rep Power: 4	wow, thanks for all the help

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C++ webserver trouble