expire.c
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2003, 2005, 2007, 2009-2012, 2014-2017 Free Software
Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Mailutils is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#include "pop3d.h"
/* EXPIRE see RFC2449:
Implementation:
When a message is downloaded by RETR or TOP, it is marked with
"X-Expire-Timestamp: N", where N is the current value of
UNIX timestamp.
If pop3d was started with --delete-expired, the messages whose
X-Expire-Timestamp is more than (time(NULL)-expire days) old
are deleted.
Otherwise, such messages remain in the mailbox and the system
administrator is supposed to run a cron job that purges the mailboxes
(easily done using GNU sieve timestamp extension).
*/
void
pop3d_mark_retr (mu_attribute_t attr)
{
mu_attribute_set_userflag (attr, POP3_ATTRIBUTE_RETR);
}
int
pop3d_is_retr (mu_attribute_t attr)
{
return mu_attribute_is_userflag (attr, POP3_ATTRIBUTE_RETR);
}
void
pop3d_unmark_retr (mu_attribute_t attr)
{
if (mu_attribute_is_userflag (attr, POP3_ATTRIBUTE_RETR))
mu_attribute_unset_userflag (attr, POP3_ATTRIBUTE_RETR);
}
static int
header_is_expired (mu_header_t hdr)
{
time_t timestamp;
char buf[64];
char *p;
if (!expire_on_exit)
return 0;
if (mu_header_get_value (hdr, MU_HEADER_X_EXPIRE_TIMESTAMP,
buf, sizeof buf, NULL))
return 0;
timestamp = strtoul (buf, &p, 0);
while (*p && mu_isspace (*p))
p++;
if (*p)
return 0;
return time (NULL) >= timestamp + expire * 86400;
}
/* If pop3d is started with --expire, add an expiration header to the message.
Additionally, if --deltete-expired option was given, mark
the message as deleted if its X-Expire-Timestamp is too old.
Arguments:
msg - Message to operate upon
value - Points to a character buffer where the value of
X-Expire-Timestamp is to be stored. *value must be set to
NULL upon the first invocation of this function */
void
expire_mark_message (mu_message_t msg, char **value)
{
/* Mark the message with a timestamp. */
if (expire != EXPIRE_NEVER)
{
mu_header_t header = NULL;
mu_attribute_t attr = NULL;
if (!*value)
mu_asprintf (value, "%lu", (unsigned long) time (NULL));
mu_message_get_header (msg, &header);
mu_message_get_attribute (msg, &attr);
if (pop3d_is_retr (attr))
mu_header_set_value (header, MU_HEADER_X_EXPIRE_TIMESTAMP, *value, 0);
if (header_is_expired (header))
mu_attribute_set_deleted (attr);
}
}