msguidl.c
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999-2002, 2004-2007, 2009-2012, 2014-2017 Free
Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library. If not, see
<http://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <mailutils/types.h>
#include <mailutils/message.h>
#include <mailutils/errno.h>
#include <mailutils/header.h>
#include <mailutils/stream.h>
#include <mailutils/md5.h>
#include <mailutils/sys/message.h>
int
mu_message_get_uidl (mu_message_t msg, char *buffer, size_t buflen,
size_t *pwriten)
{
mu_header_t header = NULL;
size_t n = 0;
int status;
if (msg == NULL || buffer == NULL || buflen == 0)
return EINVAL;
buffer[0] = '\0';
/* Try the function overload if error fallback. */
if (msg->_get_uidl)
{
status = msg->_get_uidl (msg, buffer, buflen, pwriten);
if (status == 0)
return status;
}
/* Be compatible with Qpopper ? qppoper saves the UIDL in "X-UIDL".
We generate a chksum and save it in the header. */
mu_message_get_header (msg, &header);
status = mu_header_get_value_unfold (header, "X-UIDL", buffer, buflen, &n);
if (status != 0 || n == 0)
{
size_t uid = 0;
struct mu_md5_ctx md5context;
mu_stream_t stream = NULL;
char buf[1024];
unsigned char md5digest[16];
char *tmp;
n = 0;
mu_message_get_uid (msg, &uid);
mu_message_get_streamref (msg, &stream);
mu_md5_init_ctx (&md5context);
status = mu_stream_seek (stream, 0, MU_SEEK_SET, NULL);
if (status == 0)
{
while (mu_stream_read (stream, buf, sizeof (buf), &n) == 0
&& n > 0)
mu_md5_process_bytes (buf, n, &md5context);
mu_md5_finish_ctx (&md5context, md5digest);
tmp = buf;
for (n = 0; n < 16; n++, tmp += 2)
sprintf (tmp, "%02x", md5digest[n]);
*tmp = '\0';
/* POP3 rfc says that an UID should not be longer than 70. */
snprintf (buf + 32, 70, ".%lu.%lu", (unsigned long)time (NULL),
(unsigned long) uid);
mu_header_set_value (header, "X-UIDL", buf, 1);
buflen--; /* leave space for the NULL. */
strncpy (buffer, buf, buflen)[buflen] = '\0';
}
mu_stream_destroy (&stream);
}
return status;
}
int
mu_message_set_uidl (mu_message_t msg,
int (* _get_uidl) (mu_message_t, char *, size_t, size_t *),
void *owner)
{
if (msg == NULL)
return EINVAL;
if (msg->owner != owner)
return EACCES;
msg->_get_uidl = _get_uidl;
return 0;
}