October 10, 2008 09:00pm pdt

05.27.2008 at 04:28PM PDT, ID: 23436673

	[x] Attachment Details

[x]

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7.8

Communiting to SMTP vis Client using winsock

Asked by aejaz in Simple Mail Transfer Protocol (SMTP), C Programming Language, WInsock

Tags: C / C++

Attach is a code that is a client to connect to a server using winsock programming and send message over. It is a typical client / server example using winsock programming.
What I wanted to know if this same client can communicate to SMTP server as follows
S = Server : C = Client (Using the code as attached)
i.e. when executed at dos prompt it display the result as follows (goal is to communicate with SMTP server by changing the client code as attached)

S: 220 smtp.example.com ESMTP Postfix
C: HELO relay.example.org
S: 250 Hello relay.example.org, I am glad to meet you
C: MAIL FROM:<bob@example.org>
S: 250 Ok
C: RCPT TO:<alice@example.com>
S: 250 Ok
C: DATA
S: 354 End data with <CR><LF>.<CR><LF>
C: From: "Bob Example" <bob@example.org>
C: To: Alice Example <alice@example.com>
C: Cc: theboss@example.com
C: Date: Tue, 15 Jan 2008 16:02:43 -0500
C: Subject: Test message
C:
C: Hello Alice.
C: This is a test message with 5 headers and 4 lines in the body.
C: Your friend,
C: Bob
C: .
S: 250 Ok: queued as 12345Start Free Trial

         
           
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             #include <stdio.h>
#include <winsock.h>
 
// Function prototype
void StreamClient(char *szServer, short nPort, char *szMessage);
// Helper macro for displaying errors
#define PRINTERROR(s)	\
		fprintf(stderr,"\n%: %d\n", s, WSAGetLastError())
 
 
 
////////////////////////////////////////////////////////////
 
void main(int argc, char **argv)
{
	WORD wVersionRequested = MAKEWORD(2,0);
	WSADATA wsaData;
	int nRet;
	short nPort;
 
	//
	// Check for the host and port arguments
	//
	if (argc != 4)
	{
		fprintf(stderr,"\nSyntax: client ServerName PortNumber Message\n");
		return;
	}
 
	nPort = atoi(argv[2]);
 
 
	//
	// Initialize WinSock and check the version
	//
	nRet = WSAStartup(wVersionRequested, &wsaData);
 
	//
	// Go do the stuff a stream client does
	//
	StreamClient(argv[1], nPort, argv[3]);
 
 
	//
	// Release WinSock
	//
	WSACleanup();
}
 
////////////////////////////////////////////////////////////
 
void StreamClient(char *szServer, short nPort, char *szMessage)
{
	printf("\nStream Client connecting to server: %s on port: %d",
				szServer, nPort);
 
	//
	// Find the server
	//
    LPHOSTENT lpHostEntry;
 
	lpHostEntry = gethostbyname(szServer);
    if (lpHostEntry == NULL)
    {
        PRINTERROR("gethostbyname()");
        return;
    }
 
	//
	// Create a TCP/IP stream socket
	//
	SOCKET	theSocket;
 
	theSocket = socket(AF_INET,				// Address family
					   SOCK_STREAM,			// Socket type
					   IPPROTO_TCP);		// Protocol
	if (theSocket == INVALID_SOCKET)
	{
		PRINTERROR("socket()");
		return;
	}
 
	//
	// Fill in the address structure
	//
	SOCKADDR_IN saServer;
 
	saServer.sin_family = AF_INET;
	saServer.sin_addr = *((LPIN_ADDR)*lpHostEntry->h_addr_list);
										// ^ Server's address
	saServer.sin_port = htons(nPort);	// Port number from command line
 
	//
	// connect to the server
	//
	int nRet;
 
	nRet = connect(theSocket,				// Socket
				   (LPSOCKADDR)&saServer,	// Server address
				   sizeof(struct sockaddr));// Length of server address structure
	if (nRet == SOCKET_ERROR)
	{
		PRINTERROR("socket()");
		closesocket(theSocket);
		return;
	}
 
 
	//
	// Send data to the server
	//
    
    char szBuf[256];
 
	// strcpy(szBuf, "From the Client");
	nRet = send(theSocket,				// Connected socket
				szMessage,					// Data buffer
				strlen(szMessage),			// Length of data
				0);						// Flags
	if (nRet == SOCKET_ERROR)
	{
		PRINTERROR("send()");
		closesocket(theSocket);
		return;
	}
 
 
	//
	// Wait for a reply
	//
	nRet = recv(theSocket,				// Connected socket
				szBuf,					// Receive buffer
				sizeof(szBuf)+1,			// Size of receive buffer
				0);						// Flags
	if (nRet == SOCKET_ERROR)
	{
		PRINTERROR("recv()");
		closesocket(theSocket);
		return;
	}
 
 
	//
	// Display the received data
	//
	printf("\nData received: %s", szBuf);
 
 
	closesocket(theSocket);
	return;
}

           
         

Keywords: Communiting to SMTP vis Client using …

	Title
1	Winsock GetData Error
2	Mdeamon winsock error 10054
3	SMTP Message Queu not flowing
4	Winsock Smtp
5	Winsock reset
6	winsock control

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Communiting to SMTP vis Client using winsock

Asked by aejaz in Simple Mail Transfer Protocol (SMTP), C Programming Language, WInsock

Tags: C / C++

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