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/*
* crm114 backend for dovecot antispam plugin
*
* 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
*/
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <fcntl.h>
#include "lib.h"
#include "mail-storage-private.h"
#include "antispam-plugin.h"
#include "signature.h"
static const char *reaver_binary = "/bin/false";
static char **extra_args = NULL;
static int extra_args_num = 0;
static int call_reaver(const char *signature, enum classification wanted)
{
pid_t pid;
const char *class_arg;
int pipes[2];
switch (wanted) {
case CLASS_NOTSPAM:
class_arg = "--good";
break;
case CLASS_SPAM:
class_arg = "--spam";
break;
}
/*
* For reaver stdin, it wants to read a full message but
* really only needs the signature.
*/
if (pipe(pipes))
return -1;
pid = fork();
if (pid < 0)
return -1;
if (pid) {
int status;
close(pipes[0]);
/*
* Reaver wants the mail but only needs the cache ID
*/
write(pipes[1], signature_hdr, strlen(signature_hdr));
write(pipes[1], ": ", 2);
write(pipes[1], signature, strlen(signature));
write(pipes[1], "\r\n\r\n", 4);
close(pipes[1]);
/*
* Wait for reaver
*/
waitpid(pid, &status, 0);
if (!WIFEXITED(status))
return 1;
return WEXITSTATUS(status);
} else {
int fd = open("/dev/null", O_RDONLY);
char **argv;
/* 2 fixed, extra, terminating NULL */
int sz = sizeof(char *) * (2 + extra_args_num + 1);
int i;
argv = i_malloc(sz);
memset(argv, 0, sz);
close(0);
close(1);
close(2);
/* see above */
close(pipes[1]);
if (dup2(pipes[0], 0) != 0)
exit(1);
close(pipes[0]);
if (dup2(fd, 1) != 1)
exit(1);
if (dup2(fd, 2) != 2)
exit(1);
close(fd);
argv[0] = (char *)reaver_binary;
argv[1] = (char *)class_arg;
for (i = 0; i < extra_args_num; i++)
argv[i + 2] = (char *)extra_args[i];
debugv(argv);
execv(reaver_binary, argv);
/* fall through if reaver can't be found */
debug("executing %s failed: %d (uid=%d, gid=%d)",
reaver_binary, errno, getuid(), getgid());
exit(127);
/* not reached */
return -1;
}
}
struct antispam_transaction_context {
struct siglist *siglist;
};
static struct antispam_transaction_context *
backend_start(struct mailbox *box __attr_unused__)
{
struct antispam_transaction_context *ast;
ast = i_new(struct antispam_transaction_context, 1);
ast->siglist = NULL;
return ast;
}
static void backend_rollback(struct antispam_transaction_context *ast)
{
signature_list_free(&ast->siglist);
i_free(ast);
}
static int backend_commit(struct mailbox_transaction_context *ctx,
struct antispam_transaction_context *ast)
{
struct siglist *item = ast->siglist;
int ret = 0;
while (item) {
if (call_reaver(item->sig, item->wanted)) {
ret = -1;
mail_storage_set_error(ctx->box->storage,
ME(NOTPOSSIBLE)
"Failed to call reaver");
break;
}
item = item->next;
}
signature_list_free(&ast->siglist);
i_free(ast);
return ret;
}
static int backend_handle_mail(struct mailbox_transaction_context *t,
struct antispam_transaction_context *ast,
struct mail *mail, enum classification want)
{
return signature_extract_to_list(t, mail, &ast->siglist, want);
}
static void backend_init(pool_t pool)
{
const char *tmp;
int i;
tmp = get_setting("CRM_BINARY");
if (tmp) {
reaver_binary = tmp;
debug("reaver binary set to %s\n", tmp);
}
tmp = get_setting("CRM_ARGS");
if (tmp) {
extra_args = p_strsplit(pool, tmp, ";");
extra_args_num = str_array_length(
(const char *const *)extra_args);
for (i = 0; i < extra_args_num; i++)
debug("reaver extra arg %s\n",
extra_args[i]);
}
signature_init();
}
static void backend_exit(void)
{
}
struct backend crm114_backend = {
.init = backend_init,
.exit = backend_exit,
.handle_mail = backend_handle_mail,
.start = backend_start,
.rollback = backend_rollback,
.commit = backend_commit,
};
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