recv from ftp server (winsock2)

commissar · 03-04-2005, 01:07 AM

Hi

I've been struggling to connect to a FTP server for some time now, and I really need some help. Here's my code (cut down to just the basics)

Code:

#include <stdio.h>
#include<winsock2.h>

int main(int argc, char* argv[])
{
	WORD VersionNumber;
	WSADATA WinSockData;
	VersionNumber = MAKEWORD(2, 0);
	WSAStartup(VersionNumber, &WinSockData);  

	sockaddr_in Server_addr;
   	memset(&Server_addr, 0, sizeof(sockaddr_in));
	
	Server_addr.sin_family = AF_INET;
	Server_addr.sin_addr.s_addr = inet_addr("192.168.207.1");
  	Server_addr.sin_port = htons(21);

	SOCKET ServerSocket = socket(AF_INET, SOCK_STREAM, 0);
	
	if(ServerSocket == INVALID_SOCKET)
	{
		printf("error creating socket\n");
		return 0;
	}

	if(connect(ServerSocket, (struct sockaddr*)&Server_addr, sizeof(sockaddr)) == SOCKET_ERROR)
	{
		printf("error connecting socket\n");
		return 0;
	}

	const int BUF_SIZE = 1024;
	char recvBuffer[BUF_SIZE]; 

	memset(&recvBuffer, 0, BUF_SIZE);

	if(send(ServerSocket, " ", 1, 0) == SOCKET_ERROR)
		printf("send(1) error\n");
	else
		printf("send(1) success\n");
	
	if(recv(ServerSocket, recvBuffer, BUF_SIZE, 0) == SOCKET_ERROR)
		printf("recv(1) error\n");
	else
		printf("recv(1) success\n");
	
	printf("> %s\n", recvBuffer);
  	memset(&recvBuffer, 0, BUF_SIZE);

	if(send(ServerSocket, " ", 1, 0) == SOCKET_ERROR)
		printf("send(2) error\n");
	else
		printf("send(2) success\n");
	
	if(recv(ServerSocket, recvBuffer, BUF_SIZE, 0) == SOCKET_ERROR)
		printf("recv(2) error\n");
	else
		printf("recv(2) success\n");
	
	printf("> %s\n", recvBuffer);
  	memset(&recvBuffer, 0, BUF_SIZE);

	if(send(ServerSocket, "user n124581", 12, 0) == SOCKET_ERROR)
		printf("send(3) error\n");
	else
		printf("send(3) success\n");
	
	if(recv(ServerSocket, recvBuffer, BUF_SIZE, 0) == SOCKET_ERROR)
		printf("recv(3) error\n");
	else
		printf("recv(3) success\n");
	
	printf(">>> %s\n", recvBuffer);
	
	return 0;
}

when i execute this I get the following output:

Code:

send(1) success
recv(1) success
> 220-FTPD1 IBM FTP CS V1R4 at MVSETE.IT.NEDNET.CO.ZA, 16:49:16 on 2005-03-03.

send(2) success
recv(2) success
> 220 Connection will close if idle for more than 5 minutes.

send(3) success
_

I think i'm supposed to get a return code 331(send password) from the server at this stage, but it just sits there waiting for who knows what. Could this be the server giving me a hard time, because my code looks fine to me?

Any help would be greatly appreciated.

bithub · 03-04-2005, 03:27 AM

You need to send a newline character at the end of each statement you send to the server.

For instance, you would have:

Code:

if(send(ServerSocket, "user n124581\n", 12, 0) == SOCKET_ERROR)

Also the first two send() statements which simply send a " " are unnecessary.

commissar · 03-04-2005, 04:16 AM

Ah, thank you, thank you, thank you!

you're the best!

03-04-2005, 03:27 AM	#2
bithub Registered User Join Date: Sep 2004 Location: California Posts: 3,020	You need to send a newline character at the end of each statement you send to the server. For instance, you would have: Code: if(send(ServerSocket, "user n124581\n", 12, 0) == SOCKET_ERROR) Also the first two send() statements which simply send a " " are unnecessary.
bithub is offline

03-04-2005, 04:16 AM	#3
commissar Registered User Join Date: Feb 2005 Location: south africa Posts: 7	Ah, thank you, thank you, thank you! you're the best!
commissar is offline

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