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/*
* etrn.c -- ETRN protocol methods
*
* For license terms, see the file COPYING in this directory.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <netdb.h>
#include <errno.h>
#include "fetchmail.h"
#include "smtp.h"
#include "socket.h"
static int etrn_ok (int sock, char *argbuf)
/* parse command response */
{
int ok;
ok = SMTP_ok(sock);
if (ok == SM_UNRECOVERABLE)
return(PS_PROTOCOL);
else
return(ok);
}
static int etrn_getrange(int sock, struct query *ctl, char *id, int *countp,
int *newp)
/* send ETRN and interpret the response */
{
int ok, opts, qdone = 0;
char buf [POPBUFSIZE+1],
hname[256];
const char *qname;
struct idlist *qnp; /* pointer to Q names */
struct hostent *hp;
if ((ok = SMTP_ehlo(sock, ctl->server.truename, &opts)))
{
error(0, 0, "%s's SMTP listener does not support ESMTP",
ctl->server.pollname);
return(ok);
}
else if (!(opts & ESMTP_ETRN))
{
error(0, 0, "%s's SMTP listener does not support ETRN",
ctl->server.pollname);
return(PS_PROTOCOL);
}
*countp = *newp = -1; /* make sure we don't enter the fetch loop */
/*** This is a sort of horrible HACK because the ETRN protocol
*** does not fit very well into the mailbox concept used in
*** this program (IMHO). The last element of ctl->smtphunt
*** turned out to be the host being queried (i.e., the smtp server).
*** for that reason the rather "funny" condition in the for loop.
*** Isn't it sort of unreasonable to add the server to the ETRN
*** hunt list? (Concerning ETRN I'm sure! In case I want a Q-run of
*** my SMTP-server I can always specify -Smyserver, and this is only
*** resonable if I start sendmail without -qtime and in Q-only mode.)
***
*** -- 1997-06-22 Guenther Leber
***/
/* do it for all queues in the smtphunt list except the last one
which is the SMTP-server itself */
for (qnp = ctl->smtphunt; ( (qnp != (struct idlist *) NULL) &&
(qnp->next != (struct idlist *) NULL) ) || (qdone == 0);
qnp = qnp->next, qdone++)
{
/* extract name of Q */
if ( (qnp != (struct idlist *) NULL) &&
(qnp->next != (struct idlist *) NULL) )
{
/* take Q-name given in smtp hunt list */
qname = qnp->id;
} else {
assert(qdone == 0);
/*** use fully qualified host name as Q name ***/
/* get hostname */
if (gethostname(hname, sizeof hname) != 0)
{
/* exit with error message */
error(0, errno, "gethostname failed: ");
return PS_UNDEFINED;
}
/* in case we got a host basename (as we do in Linux),
make a FQDN of it */
hp = gethostbyname(hname);
if (hp == (struct hostent *) NULL)
{
/* exit with error message */
error(0, 0, "gethostbyname failed for %s", hname);
return PS_TRANSIENT;
}
/* here it is */
qname = hp->h_name;
}
/* ship the actual poll and get the response */
gen_send(sock, "ETRN %s", qname);
if ((ok = gen_recv(sock, buf, sizeof(buf))))
return(ok);
/* this switch includes all the response codes described in RFC1985 */
switch(atoi(buf))
{
case 250: /* OK, queuing for node <x> started */
error(0, 0, "Queuing for %s started", qname);
break;
case 251: /* OK, no messages waiting for node <x> */
error(0, 0, "No messages waiting for %s", qname);
return(PS_NOMAIL);
case 252: /* OK, pending messages for node <x> started */
case 253: /* OK, <n> pending messages for node <x> started */
error(0, 0, "Pending messages for %s started", qname);
break;
case 458: /* Unable to queue messages for node <x> */
error(0, -1, "Unable to queue messages for node %s", qname);
return(PS_PROTOCOL);
case 459: /* Node <x> not allowed: <reason> */
error(0, -1, "Node %s not allowed: %s", qname, buf);
return(PS_AUTHFAIL);
case 500: /* Syntax Error */
error(0, -1, "ETRN syntax error");
return(PS_PROTOCOL);
case 501: /* Syntax Error in Parameters */
error(0, -1, "ETRN syntax error in parameters");
return(PS_PROTOCOL);
default:
error(0, -1, "Unknown ETRN error %d", atoi(buf));
return(PS_PROTOCOL);
}
}
return(0);
}
const static struct method etrn =
{
"ETRN", /* ESMTP ETRN extension */
25, /* standard SMTP port */
FALSE, /* this is not a tagged protocol */
FALSE, /* this does not use a message delimiter */
FALSE, /* no getsizes method */
etrn_ok, /* parse command response */
NULL, /* no need to get authentication */
etrn_getrange, /* initialize message sending */
NULL, /* we cannot get a list of sizes */
NULL, /* how do we tell a message is old? */
NULL, /* no way to fetch headers */
NULL, /* no way to fetch body */
NULL, /* no message trailer */
NULL, /* how to delete a message */
NULL, /* no retained-header check */
"QUIT", /* the ETRN exit command */
};
int doETRN (struct query *ctl)
/* retrieve messages using ETRN */
{
if (ctl->keep) {
fprintf(stderr, "Option --keep is not supported with ETRN\n");
return(PS_SYNTAX);
}
if (ctl->flush) {
fprintf(stderr, "Option --flush is not supported with ETRN\n");
return(PS_SYNTAX);
}
if (ctl->mailboxes->id) {
fprintf(stderr, "Option --remote is not supported with ETRN\n");
return(PS_SYNTAX);
}
if (check_only) {
fprintf(stderr, "Option --check is not supported with ETRN\n");
return(PS_SYNTAX);
}
peek_capable = FALSE;
return(do_protocol(ctl, &etrn));
}
/* etrn.c ends here */
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