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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 <unistd.h>
#include <string.h>
#include "fetchmail.h"
#include "socket.h"
#include "smtp.h"
struct opt
{
char *name;
int value;
};
static struct opt extensions[] =
{
{"8BITMIME", ESMTP_8BITMIME},
{(char *)NULL, 0},
};
int smtp_response; /* numeric value of SMTP response code */
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)
error(0, 0, "SMTP> HELO %s", host);
ok = SMTP_ok(sockfp);
return ok;
}
int SMTP_ehlo(FILE *sockfp, char *host, int *opt)
/* send a "EHLO" message to the SMTP listener, return extension status bits */
{
int ok;
char buf[SMTPBUFSIZE], *ip;
struct opt *hp;
SockPrintf(sockfp,"EHLO %s\r\n", host);
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP> EHLO %s", host);
*opt = 0;
while ((ip = SockGets(buf, sizeof(buf)-1, sockfp)))
{
int n = strlen(ip);
if (buf[strlen(buf)-1] == '\n')
buf[strlen(buf)-1] = '\0';
if (buf[strlen(buf)-1] == '\r')
buf[strlen(buf)-1] = '\r';
if (n < 4)
return SM_ERROR;
buf[n] = '\0';
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP< %s", buf);
for (hp = extensions; hp->name; hp++)
if (!strncasecmp(hp->name, buf+4, strlen(hp->name)))
*opt |= hp->value;
smtp_response = atoi(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_from(FILE *sockfp, char *from, char *opts)
/* send a "MAIL FROM:" message to the SMTP listener */
{
int ok;
struct opt *hp;
char buf[MSGBUFSIZE];
sprintf(buf, "MAIL FROM:<%s>", from);
if (opts)
strcat(buf, opts);
SockPrintf(sockfp,"%s\r\n", buf);
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP> %s", buf);
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)
error(0, 0, "SMTP> RCPT TO:<%s>", 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)
error(0, 0, "SMTP> DATA");
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)
error(0, 0, "SMTP> QUIT");
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)
error(0, 0, "SMTP>. (EOM)");
ok = SMTP_ok(sockfp);
return ok;
}
int SMTP_ok(FILE *sockfp)
/* returns status of SMTP connection */
{
char buf[SMTPBUFSIZE], *ip;
while ((ip = SockGets(buf, sizeof(buf)-1, sockfp)))
{
int n = strlen(ip);
if (buf[strlen(buf)-1] == '\n')
buf[strlen(buf)-1] = '\0';
if (buf[strlen(buf)-1] == '\r')
buf[strlen(buf)-1] = '\r';
if (n < 4)
return SM_ERROR;
buf[n] = '\0';
if (outlevel == O_VERBOSE)
error(0, 0, "SMTP< %s", buf);
smtp_response = atoi(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;
}
/* smtp.c ends here */
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