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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 1997 Eric S. Raymond
* For license terms, see the file COPYING in this directory.
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include "fetchmail.h"
#include "socket.h"
#include "smtp.h"
#include "config.h"
struct opt
{
const char *name;
int value;
};
static struct opt extensions[] =
{
{"8BITMIME", ESMTP_8BITMIME},
{"SIZE", ESMTP_SIZE},
{"ETRN", ESMTP_ETRN},
{(char *)NULL, 0},
};
char smtp_response[MSGBUFSIZE];
static char smtp_mode = 'S';
void SMTP_setmode(char sl)
/* set whether we are speaking SMTP or LMTP */
{
smtp_mode = sl;
}
int SMTP_helo(int sock,const char *host)
/* send a "HELO" message to the SMTP listener */
{
int ok;
SockPrintf(sock,"HELO %s\r\n", host);
if (outlevel >= O_MONITOR)
report(stdout, 0, "SMTP> HELO %s\n", host);
ok = SMTP_ok(sock);
return ok;
}
int SMTP_ehlo(int sock, const char *host, int *opt)
/* send a "EHLO" message to the SMTP listener, return extension status bits */
{
struct opt *hp;
SockPrintf(sock,"%cHLO %s\r\n", (smtp_mode == 'S') ? 'E' : smtp_mode, host);
if (outlevel >= O_MONITOR)
report(stdout, 0, "%cMTP> %cHLO %s\n",
smtp_mode, (smtp_mode == 'S') ? 'E' : smtp_mode, host);
*opt = 0;
while ((SockRead(sock, smtp_response, sizeof(smtp_response)-1)) != -1)
{
int n = strlen(smtp_response);
if (smtp_response[strlen(smtp_response)-1] == '\n')
smtp_response[strlen(smtp_response)-1] = '\0';
if (smtp_response[strlen(smtp_response)-1] == '\r')
smtp_response[strlen(smtp_response)-1] = '\0';
if (n < 4)
return SM_ERROR;
smtp_response[n] = '\0';
if (outlevel >= O_MONITOR)
report(stdout, 0, "SMTP< %s\n", smtp_response);
for (hp = extensions; hp->name; hp++)
if (!strncasecmp(hp->name, smtp_response+4, strlen(hp->name)))
*opt |= hp->value;
if ((smtp_response[0] == '1' || smtp_response[0] == '2' || smtp_response[0] == '3') && smtp_response[3] == ' ')
return SM_OK;
else if (smtp_response[3] != '-')
return SM_ERROR;
}
return SM_UNRECOVERABLE;
}
int SMTP_from(int sock, const char *from, const char *opts)
/* send a "MAIL FROM:" message to the SMTP listener */
{
int ok;
char buf[MSGBUFSIZE];
if (strchr(from, '<'))
sprintf(buf, "MAIL FROM: %s", from);
else
sprintf(buf, "MAIL FROM:<%s>", from);
if (opts)
strcat(buf, opts);
SockPrintf(sock,"%s\r\n", buf);
if (outlevel >= O_MONITOR)
report(stdout, 0, "%cMTP> %s\n", smtp_mode, buf);
ok = SMTP_ok(sock);
return ok;
}
int SMTP_rcpt(int sock, const char *to)
/* send a "RCPT TO:" message to the SMTP listener */
{
int ok;
SockPrintf(sock,"RCPT TO:<%s>\r\n", to);
if (outlevel >= O_MONITOR)
report(stdout, 0, "%cMTP> RCPT TO:<%s>\n", smtp_mode, to);
ok = SMTP_ok(sock);
return ok;
}
int SMTP_data(int sock)
/* send a "DATA" message to the SMTP listener */
{
int ok;
SockPrintf(sock,"DATA\r\n");
if (outlevel >= O_MONITOR)
report(stdout, 0, "%cMTP> DATA\n", smtp_mode);
ok = SMTP_ok(sock);
return ok;
}
int SMTP_rset(int sock)
/* send a "RSET" message to the SMTP listener */
{
int ok;
SockPrintf(sock,"RSET\r\n");
if (outlevel >= O_MONITOR)
report(stdout, 0, "%cMTP> RSET\n", smtp_mode);
ok = SMTP_ok(sock);
return ok;
}
int SMTP_quit(int sock)
/* send a "QUIT" message to the SMTP listener */
{
int ok;
SockPrintf(sock,"QUIT\r\n");
if (outlevel >= O_MONITOR)
report(stdout, 0, "%cMTP> QUIT\n", smtp_mode);
ok = SMTP_ok(sock);
return ok;
}
int SMTP_eom(int sock)
/* send a message data terminator to the SMTP listener */
{
int ok;
SockPrintf(sock,".\r\n");
if (outlevel >= O_MONITOR)
report(stdout, 0, "%cMTP>. (EOM)\n", smtp_mode);
/*
* When doing LMTP, must process many of these at the outer level.
*/
if (smtp_mode == 'S')
ok = SMTP_ok(sock);
else
ok = SM_OK;
return ok;
}
int SMTP_ok(int sock)
/* returns status of SMTP connection */
{
while ((SockRead(sock, smtp_response, sizeof(smtp_response)-1)) != -1)
{
int n = strlen(smtp_response);
if (smtp_response[strlen(smtp_response)-1] == '\n')
smtp_response[strlen(smtp_response)-1] = '\0';
if (smtp_response[strlen(smtp_response)-1] == '\r')
smtp_response[strlen(smtp_response)-1] = '\0';
if (n < 4)
return SM_ERROR;
smtp_response[n] = '\0';
if (outlevel >= O_MONITOR)
report(stdout, 0, "%cMTP< %s\n", smtp_mode, smtp_response);
if ((smtp_response[0] == '1' || smtp_response[0] == '2' || smtp_response[0] == '3') && smtp_response[3] == ' ')
return SM_OK;
else if (smtp_response[3] != '-')
return SM_ERROR;
}
return SM_UNRECOVERABLE;
}
/* smtp.c ends here */
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