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/*
* smtp.c -- code for speaking SMTP to a listener port
*
* Concept due to Harry Hochheiser. Implementation by ESR. Cleanup and
* strict RFC821 compliance by Cameron MacPherson.
*
* Copyright 1996 Eric S. Raymond
* All rights reserved.
* For license terms, see the file COPYING in this directory.
*/
#include <stdio.h>
#include <config.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include "socket.h"
#include "fetchmail.h"
#include "smtp.h"
int SMTP_helo(FILE *sockfp,char *host)
/* send a "HELO" message to the SMTP listener */
{
int ok;
SockPrintf(sockfp,"HELO %s\r\n", host);
if (outlevel == O_VERBOSE)
fprintf(stderr, "SMTP> HELO %s\n", host);
ok = SMTP_ok(sockfp);
return ok;
}
int SMTP_from(FILE *sockfp, char *from)
/* send a "MAIL FROM:" message to the SMTP listener */
{
int ok;
SockPrintf(sockfp,"MAIL FROM:<%s>\r\n", from);
if (outlevel == O_VERBOSE)
fprintf(stderr, "SMTP> MAIL FROM:<%s>\n", from);
ok = SMTP_ok(sockfp);
return ok;
}
int SMTP_rcpt(FILE *sockfp, char *to)
/* send a "RCPT TO:" message to the SMTP listener */
{
int ok;
SockPrintf(sockfp,"RCPT TO:<%s>\r\n", to);
if (outlevel == O_VERBOSE)
fprintf(stderr, "SMTP> RCPT TO:<%s>\n", to);
ok = SMTP_ok(sockfp);
return ok;
}
int SMTP_data(FILE *sockfp)
/* send a "DATA" message to the SMTP listener */
{
int ok;
SockPrintf(sockfp,"DATA\r\n");
if (outlevel == O_VERBOSE)
fprintf(stderr, "SMTP> DATA\n");
ok = SMTP_ok(sockfp);
return ok;
}
int SMTP_quit(FILE *sockfp)
/* send a "QUIT" message to the SMTP listener */
{
int ok;
SockPrintf(sockfp,"QUIT\r\n");
if (outlevel == O_VERBOSE)
fprintf(stderr, "SMTP> QUIT\n");
ok = SMTP_ok(sockfp);
return ok;
}
int SMTP_eom(FILE *sockfp)
/* send a message data terminator to the SMTP listener */
{
int ok;
SockPrintf(sockfp,".\r\n");
if (outlevel == O_VERBOSE)
fprintf(stderr, "SMTP>. (EOM)\n");
ok = SMTP_ok(sockfp);
return ok;
}
void SMTP_rset(FILE *sockfp)
/* send a "RSET" message to the SMTP listener */
{
SockPrintf(sockfp,"RSET\r\n");
if (outlevel == O_VERBOSE)
fprintf(stderr, "SMTP> RSET\n");
}
static int SMTP_check(FILE *sockfp)
/* returns status of SMTP connection */
{
int n;
char buf[SMTPBUFSIZE];
while ((n = SockGets(buf, sizeof(buf)-1, sockfp)) > 0)
{
if (n < 4)
return SM_ERROR;
buf[n] = '\0';
if (outlevel == O_VERBOSE)
fprintf(stderr, "SMTP< %s\n", buf);
if ((buf[0] == '1' || buf[0] == '2' || buf[0] == '3') && buf[3] == ' ')
return SM_OK;
else if (buf[3] != '-')
return SM_ERROR;
}
return SM_UNRECOVERABLE;
}
int SMTP_ok(FILE *sockfp)
/* accepts SMTP response, returns status of SMTP connection */
{
int ok;
/* I can tell that the SMTP server connection is ok if I can read a
status message that starts with "1xx" ,"2xx" or "3xx".
Therefore, it can't be ok if there's no data waiting to be read
Tried to deal with this with a call to SockDataWaiting, but
it failed badly.
*/
ok = SMTP_check(sockfp);
if (ok == SM_ERROR) /* if we got an error, */
{
SMTP_rset(sockfp);
ok = SMTP_check(sockfp); /* how does it look now ? */
if (ok == SM_OK)
ok = SM_ERROR; /* It's just a simple error, for*/
/* the current message */
else
ok = SM_UNRECOVERABLE; /* if it still says error, we're */
/* in bad shape */
}
return ok;
}
/* smtp.c ends here */
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