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/*
* antispam plugin for dovecot
*
* Copyright (C) 2004-2007 Johannes Berg <johannes@sipsolutions.net>
* 2006 Frank Cusack
*
* 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
*
* based on the original framework http://www.dovecot.org/patches/1.0/copy_plugin.c
*
* Please see http://johannes.sipsolutions.net/wiki/Projects/dovecot-dspam-integration
* for more information on this code.
*
* Install the plugin in the usual dovecot module location.
*/
#include <unistd.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
#ifdef DEBUG
#include <syslog.h>
#endif
/* dovecot headers we need */
#include "lib.h"
#include "mempool.h"
#include "str.h"
#include "strfuncs.h"
#include "commands.h"
#include "imap-search.h"
#include "lib-storage/mail-storage.h"
#include "mail-storage.h"
#include "client.h"
#include "ostream.h"
/* internal stuff we need */
#include "plugin.h"
static struct signature *list_add(pool_t pool, struct signature *list)
{
struct signature *n;
n = p_malloc(pool, sizeof(struct signature));
n->next = list;
n->sig = NULL;
return n;
}
static void client_send_sendalive_if_needed(struct client *client)
{
time_t now, last_io;
if (o_stream_get_buffer_used_size(client->output) != 0)
return;
now = time(NULL);
last_io = I_MAX(client->last_input, client->last_output);
if (now - last_io > MAIL_STORAGE_STAYALIVE_SECS) {
o_stream_send_str(client->output, "* OK Hang in there..\r\n");
o_stream_flush(client->output);
client->last_output = now;
}
}
static int fetch_and_copy(struct client *client,
struct mailbox_transaction_context *t,
struct mail_search_arg *search_args)
{
struct mail_search_context *search_ctx;
struct mailbox_transaction_context *src_trans;
struct mail_keywords *keywords;
const char *const *keywords_list;
struct mail *mail;
unsigned int copy_count = 0;
int ret;
src_trans = mailbox_transaction_begin(client->mailbox, 0);
search_ctx = mailbox_search_init(src_trans, NULL, search_args, NULL);
mail = mail_alloc(src_trans, MAIL_FETCH_STREAM_HEADER |
MAIL_FETCH_STREAM_BODY, NULL);
ret = 1;
while (mailbox_search_next(search_ctx, mail) > 0 && ret > 0) {
if (mail->expunged) {
ret = 0;
break;
}
if ((++copy_count % COPY_CHECK_INTERVAL) == 0)
client_send_sendalive_if_needed(client);
keywords_list = mail_get_keywords(mail);
keywords = strarray_length(keywords_list) == 0 ? NULL :
mailbox_keywords_create(t, keywords_list);
if (mailbox_copy(t, mail, mail_get_flags(mail),
keywords, NULL) < 0)
ret = mail->expunged ? 0 : -1;
mailbox_keywords_free(t, &keywords);
}
mail_free(&mail);
if (mailbox_search_deinit(&search_ctx) < 0)
ret = -1;
if (mailbox_transaction_commit(&src_trans, 0) < 0)
ret = -1;
return ret;
}
static bool cmd_copy_antispam(struct client_command_context *cmd)
{
struct client *client = cmd->client;
struct mail_storage *storage;
struct mailbox *destbox;
struct mailbox_transaction_context *t;
struct mail_search_arg *search_arg;
const char *messageset, *mailbox;
enum mailbox_sync_flags sync_flags = 0;
int ret;
/* <message set> <mailbox> */
if (!client_read_string_args(cmd, 2, &messageset, &mailbox))
return FALSE;
if (!client_verify_open_mailbox(cmd))
return TRUE;
/* open the destination mailbox */
if (!client_verify_mailbox_name(cmd, mailbox, TRUE, FALSE))
return TRUE;
search_arg = imap_search_get_arg(cmd, messageset, cmd->uid);
if (search_arg == NULL)
return TRUE;
storage = client_find_storage(cmd, &mailbox);
if (storage == NULL)
return TRUE;
if (mailbox_equals(client->mailbox, storage, mailbox))
destbox = client->mailbox;
else {
destbox = mailbox_open(storage, mailbox, NULL,
MAILBOX_OPEN_SAVEONLY |
MAILBOX_OPEN_FAST |
MAILBOX_OPEN_KEEP_RECENT);
if (destbox == NULL) {
client_send_storage_error(cmd, storage);
return TRUE;
}
}
t = mailbox_transaction_begin(destbox,
MAILBOX_TRANSACTION_FLAG_EXTERNAL);
ret = fetch_and_copy(client, t, search_arg);
if (ret <= 0)
mailbox_transaction_rollback(&t);
else {
if (mailbox_transaction_commit(&t, 0) < 0)
ret = -1;
}
if (destbox != client->mailbox) {
sync_flags |= MAILBOX_SYNC_FLAG_FAST;
mailbox_close(&destbox);
}
if (ret > 0)
return cmd_sync(cmd, sync_flags, 0, "OK Copy completed.");
else if (ret == 0) {
/* some messages were expunged, sync them */
return cmd_sync(cmd, 0, 0,
"NO Some of the requested messages no longer exist.");
} else {
client_send_storage_error(cmd, storage);
return TRUE;
}
}
static bool cmd_append_antispam(struct client_command_context *cmd)
{
const char *mailbox;
struct mail_storage *storage;
struct mailbox *box;
/* <mailbox> */
if (!client_read_string_args(cmd, 1, &mailbox))
return FALSE;
storage = client_find_storage(cmd, &mailbox);
if (storage == NULL)
return FALSE;
box =
mailbox_open(storage, mailbox, NULL,
MAILBOX_OPEN_FAST | MAILBOX_OPEN_KEEP_RECENT);
if (box != NULL) {
if (mailbox_equals(box, storage, "SPAM")) {
mailbox_close(&box);
return cmd_sync(cmd, 0, 0,
"NO Cannot APPEND to SPAM box, sorry.");
}
mailbox_close(&box);
}
return cmd_append(cmd);
}
void dspam_init(void)
{
command_unregister("COPY");
command_unregister("APPEND");
command_unregister("UID COPY");
/*
* i_strdup() here is a kludge to avoid crashing in commands_deinit()
* since modules are unloaded before it's called, this "COPY" string
* would otherwise point to nonexisting memory.
*/
command_register(i_strdup("COPY"), cmd_copy_antispam);
command_register(i_strdup("UID COPY"), cmd_copy_antispam);
command_register(i_strdup("APPEND"), cmd_append_antispam);
}
void dspam_deinit(void)
{
}
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