numaddr.c
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999-2002, 2005, 2007, 2010-2012, 2014-2016 Free
Software Foundation, Inc.
GNU Mailutils 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, 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with GNU Mailutils. If not, see
<http://www.gnu.org/licenses/>. */;
/* This is an example on how to write extension tests for GNU sieve.
It provides test "numaddr".
Syntax: numaddr [":over" / ":under"] <header-names: string-list>
<limit: number>
The "numaddr" test counts Internet addresses in structured headers
that contain addresses. It returns true if the total number of
addresses satisfies the requested relation:
If the argument is ":over" and the number of addresses is greater than
the number provided, the test is true; otherwise, it is false.
If the argument is ":under" and the number of addresses is less than
the number provided, the test is true; otherwise, it is false.
If the argument is empty, ":over" is assumed. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <mailutils/sieve.h>
struct val_ctr { /* Data passed to the counter function */
mu_header_t hdr; /* Headers of the current message */
size_t limit; /* Limit for the number of addresses */
size_t count; /* Number of addresses counted so far */
};
/* Count addresses in a single header value.
Input:
ITEM is the name of the header to scan.
DATA is a pointer to the val_ctr structure
Return value:
non-zero if the limit on the number of addresses has been reached. */
static int
_count_items (void *item, void *data)
{
char *name = item;
struct val_ctr *vp = data;
char *val;
mu_address_t addr;
size_t count = 0;
if (mu_header_aget_value (vp->hdr, name, &val))
return 0;
if (mu_address_create (&addr, val) == 0)
{
mu_address_get_count (addr, &count);
mu_address_destroy (&addr);
vp->count += count;
}
free (val);
return vp->count >= vp->limit;
}
/* Handler for the numaddr test */
static int
numaddr_test (mu_sieve_machine_t mach, mu_list_t args, mu_list_t tags)
{
mu_sieve_value_t *h, *v;
struct val_ctr vc;
int rc;
if (mu_sieve_get_debug_level (mach) & MU_SIEVE_DEBUG_TRACE)
{
mu_sieve_debug (mach, "NUMADDR");
}
/* Retrieve required arguments: */
/* First argument: list of header names */
h = mu_sieve_value_get (args, 0);
if (!h)
{
mu_sieve_error (mach, "numaddr: can't get argument 1");
mu_sieve_abort (mach);
}
/* Second argument: Limit on the number of addresses */
v = mu_sieve_value_get (args, 1);
if (!v)
{
mu_sieve_error (mach, "numaddr: can't get argument 2");
mu_sieve_abort (mach);
}
/* Fill in the val_ctr structure */
mu_message_get_header (mu_sieve_get_message (mach), &vc.hdr);
vc.count = 0;
vc.limit = v->v.number;
/* Count the addresses */
rc = mu_sieve_vlist_do (h, _count_items, &vc);
/* Here rc >= 1 iff the counted number of addresses is greater or equal
to vc.limit. If `:under' tag was given we reverse the return value */
if (mu_sieve_tag_lookup (tags, "under", NULL))
rc = !rc;
return rc;
}
/* Syntactic definitions for the numaddr test */
/* Required arguments: */
static mu_sieve_data_type numaddr_req_args[] = {
SVT_STRING_LIST,
SVT_NUMBER,
SVT_VOID
};
/* Tagged arguments: */
static mu_sieve_tag_def_t numaddr_tags[] = {
{ "over", SVT_VOID },
{ "under", SVT_VOID },
{ NULL }
};
static mu_sieve_tag_group_t numaddr_tag_groups[] = {
{ numaddr_tags, NULL },
{ NULL }
};
/* Initialization function. It is the only function exported from this
module. */
int
SIEVE_EXPORT(numaddr,init) (mu_sieve_machine_t mach)
{
return mu_sieve_register_test (mach, "numaddr", numaddr_test,
numaddr_req_args, numaddr_tag_groups, 1);
}