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/*
* signature logging backend for dovecot antispam plugin
*
* Copyright (C) 2007 Johannes Berg <johannes@sipsolutions.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License Version 2 as
* published by the Free Software Foundation.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/*
* A training implementation must still be written, it needs, to be atomic,
* use transactions to get a list of all values and delete them at the same
* time, or use a temporary table that is copied from the original while the
* original is emptied (again, atomically)
*/
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <fcntl.h>
#include "lib.h"
#include "dict.h"
#include "mail-storage-private.h"
#include "antispam-plugin.h"
#include "signature.h"
static const char *dict_uri = NULL;
static const char *dict_user = NULL;
struct antispam_transaction_context {
struct dict *dict;
struct dict_transaction_context *dict_ctx;
};
struct antispam_transaction_context *backend_start(struct mailbox *box)
{
struct antispam_transaction_context *ast;
ast = i_new(struct antispam_transaction_context, 1);
ast->dict = dict_init(dict_uri, dict_user);
/* see comment below */
// if (ast->dict)
// ast->dict_ctx = dict_transaction_begin(ast->dict);
return ast;
}
void backend_rollback(struct antispam_transaction_context *ast)
{
if (ast->dict) {
// dict_transaction_rollback(ast->dict_ctx);
dict_deinit(&ast->dict);
}
i_free(ast);
}
int backend_commit(struct mailbox_transaction_context *ctx,
struct antispam_transaction_context *ast)
{
int ret = 0;
if (ast->dict) {
ret = 0;
// ret = dict_transaction_commit(ast->dict_ctx);
dict_deinit(&ast->dict);
}
i_free(ast);
return ret;
}
int backend_handle_mail(struct mailbox_transaction_context *t,
struct antispam_transaction_context *ast,
struct mail *mail, enum classification wanted)
{
const char *signature;
int ret;
int inc;
if (!ast->dict) {
mail_storage_set_error(t->box->storage,
"Failed to initialise dict connection");
return -1;
}
signature = signature_extract(t, mail);
switch (wanted) {
case CLASS_SPAM:
inc = 1;
break;
case CLASS_NOTSPAM:
inc = -1;
break;
}
/*
* We really should have a global transaction as implemented
* by the code that is commented out with C99 comments (//).
* However, this breaks because
* (1) sqlite cannot nest transactions
* (2) the dict proxy keeps only a single connection open
* (3) we here have a transaction per mailbox which makes two
* when moving messages (we might be able to hack around
* this but it's not trivial)
*/
ast->dict_ctx = dict_transaction_begin(ast->dict);
signature = t_strconcat("priv/", signature, NULL);
dict_atomic_inc(ast->dict_ctx, signature, inc);
ret = dict_transaction_commit(ast->dict_ctx);
if (ret)
mail_storage_set_error(t->box->storage,
"Failed to count signature");
return ret;
}
void backend_init(pool_t pool)
{
char *tmp;
tmp = getenv("ANTISPAM_SIGLOG_DICT_URI");
if (tmp) {
dict_uri = tmp;
debug("antispam: signature logger dict URI set to %s\n", tmp);
}
tmp = getenv("ANTISPAM_SIGLOG_DICT_USER");
if (tmp) {
dict_user = tmp;
debug("antispam: signature logger dict user set to %s\n", tmp);
}
signature_init();
}
void backend_exit(void)
{
}
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