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/* $OpenBSD: filter_api.c,v 1.4 2012/08/19 14:16:58 chl Exp $ */
/*
* Copyright (c) 2011 Gilles Chehade <gilles@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/uio.h>
#include <err.h>
#include <event.h>
#include <fcntl.h>
#include <imsg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "filter_api.h"
static struct filter_internals {
struct event ev;
struct imsgbuf ibuf;
enum filter_status (*connect_cb)(uint64_t, struct filter_connect *, void *);
void *connect_cb_arg;
enum filter_status (*helo_cb)(uint64_t, struct filter_helo *, void *);
void *helo_cb_arg;
enum filter_status (*ehlo_cb)(uint64_t, struct filter_helo *, void *);
void *ehlo_cb_arg;
enum filter_status (*mail_cb)(uint64_t, struct filter_mail *, void *);
void *mail_cb_arg;
enum filter_status (*rcpt_cb)(uint64_t, struct filter_rcpt *, void *);
void *rcpt_cb_arg;
enum filter_status (*dataline_cb)(uint64_t, struct filter_dataline *, void *);
void *dataline_cb_arg;
enum filter_status (*quit_cb)(uint64_t, void *);
void *quit_cb_arg;
enum filter_status (*close_cb)(uint64_t, void *);
void *close_cb_arg;
enum filter_status (*rset_cb)(uint64_t, void *);
void *rset_cb_arg;
} fi;
static void filter_handler(int, short, void *);
static void filter_register_callback(enum filter_type, void *, void *);
void
filter_init(void)
{
bzero(&fi, sizeof (fi));
imsg_init(&fi.ibuf, 0);
event_init();
event_set(&fi.ev, 0, EV_READ, filter_handler, (void *)&fi);
event_add(&fi.ev, NULL);
}
void
filter_loop(void)
{
if (event_dispatch() < 0)
errx(1, "event_dispatch");
}
void
filter_register_connect_callback(enum filter_status (*cb)(uint64_t, struct filter_connect *, void *), void *cb_arg)
{
filter_register_callback(FILTER_CONNECT, cb, cb_arg);
}
void
filter_register_helo_callback(enum filter_status (*cb)(uint64_t, struct filter_helo *, void *), void *cb_arg)
{
filter_register_callback(FILTER_HELO, cb, cb_arg);
}
void
filter_register_ehlo_callback(enum filter_status (*cb)(uint64_t, struct filter_helo *, void *), void *cb_arg)
{
filter_register_callback(FILTER_EHLO, cb, cb_arg);
}
void
filter_register_mail_callback(enum filter_status (*cb)(uint64_t, struct filter_mail *, void *), void *cb_arg)
{
filter_register_callback(FILTER_MAIL, cb, cb_arg);
}
void
filter_register_rcpt_callback(enum filter_status (*cb)(uint64_t, struct filter_rcpt *, void *), void *cb_arg)
{
filter_register_callback(FILTER_RCPT, cb, cb_arg);
}
void
filter_register_dataline_callback(enum filter_status (*cb)(uint64_t, struct filter_dataline *, void *), void *cb_arg)
{
filter_register_callback(FILTER_DATALINE, cb, cb_arg);
}
void
filter_register_quit_callback(enum filter_status (*cb)(uint64_t, void *), void *cb_arg)
{
filter_register_callback(FILTER_QUIT, cb, cb_arg);
}
void
filter_register_close_callback(enum filter_status (*cb)(uint64_t, void *), void *cb_arg)
{
filter_register_callback(FILTER_CLOSE, cb, cb_arg);
}
void
filter_register_rset_callback(enum filter_status (*cb)(uint64_t, void *), void *cb_arg)
{
filter_register_callback(FILTER_RSET, cb, cb_arg);
}
static void
filter_register_callback(enum filter_type type, void *cb, void *cb_arg)
{
switch (type) {
case FILTER_CONNECT:
fi.connect_cb = cb;
fi.connect_cb_arg = cb_arg;
break;
case FILTER_HELO:
fi.helo_cb = cb;
fi.helo_cb_arg = cb_arg;
break;
case FILTER_EHLO:
fi.ehlo_cb = cb;
fi.ehlo_cb_arg = cb_arg;
break;
case FILTER_MAIL:
fi.mail_cb = cb;
fi.mail_cb_arg = cb_arg;
break;
case FILTER_RCPT:
fi.rcpt_cb = cb;
fi.rcpt_cb_arg = cb_arg;
break;
case FILTER_DATALINE:
fi.dataline_cb = cb;
fi.dataline_cb_arg = cb_arg;
break;
case FILTER_QUIT:
fi.quit_cb = cb;
fi.quit_cb_arg = cb_arg;
break;
case FILTER_CLOSE:
fi.close_cb = cb;
fi.close_cb_arg = cb_arg;
break;
case FILTER_RSET:
fi.rset_cb = cb;
fi.rset_cb_arg = cb_arg;
break;
default:
errx(1, "filter_register_callback: unknown filter type");
}
}
static void
filter_handler(int fd, short event, void *p)
{
struct imsg imsg;
ssize_t n;
short evflags = EV_READ;
enum filter_status ret;
struct filter_msg fm;
if (event & EV_READ) {
n = imsg_read(&fi.ibuf);
if (n == -1)
err(1, "imsg_read");
if (n == 0) {
event_del(&fi.ev);
event_loopexit(NULL);
return;
}
}
if (event & EV_WRITE) {
if (msgbuf_write(&fi.ibuf.w) == -1)
err(1, "msgbuf_write");
if (fi.ibuf.w.queued)
evflags |= EV_WRITE;
}
for (;;) {
n = imsg_get(&fi.ibuf, &imsg);
if (n == -1)
errx(1, "imsg_get");
if (n == 0)
break;
if ((imsg.hdr.len - IMSG_HEADER_SIZE)
!= sizeof(fm))
errx(1, "corrupted imsg");
memcpy(&fm, imsg.data, sizeof (fm));
if (fm.version != FILTER_API_VERSION)
errx(1, "API version mismatch");
switch (imsg.hdr.type) {
case FILTER_CONNECT:
if (fi.connect_cb == NULL)
goto ignore;
ret = fi.connect_cb(fm.cl_id, &fm.u.connect,
fi.connect_cb_arg);
break;
case FILTER_HELO:
if (fi.helo_cb == NULL)
goto ignore;
ret = fi.helo_cb(fm.cl_id, &fm.u.helo,
fi.helo_cb_arg);
break;
case FILTER_EHLO:
if (fi.ehlo_cb == NULL)
goto ignore;
ret = fi.ehlo_cb(fm.cl_id, &fm.u.helo,
fi.ehlo_cb_arg);
break;
case FILTER_MAIL:
if (fi.mail_cb == NULL)
goto ignore;
ret = fi.mail_cb(fm.cl_id, &fm.u.mail,
fi.mail_cb_arg);
break;
case FILTER_RCPT:
if (fi.rcpt_cb == NULL)
goto ignore;
ret = fi.rcpt_cb(fm.cl_id, &fm.u.rcpt,
fi.rcpt_cb_arg);
break;
case FILTER_DATALINE:
if (fi.dataline_cb == NULL)
goto ignore;
ret = fi.dataline_cb(fm.cl_id, &fm.u.dataline,
fi.dataline_cb_arg);
break;
case FILTER_QUIT:
if (fi.quit_cb == NULL)
goto ignore;
ret = fi.quit_cb(fm.cl_id, fi.quit_cb_arg);
break;
case FILTER_CLOSE:
if (fi.close_cb == NULL)
goto ignore;
ret = fi.close_cb(fm.cl_id, fi.close_cb_arg);
break;
case FILTER_RSET:
if (fi.rset_cb == NULL)
goto ignore;
ret = fi.rset_cb(fm.cl_id, fi.rset_cb_arg);
break;
default:
errx(1, "unsupported imsg");
}
switch (ret) {
case STATUS_ACCEPT:
case STATUS_REJECT:
fm.code = ret;
imsg_compose(&fi.ibuf, imsg.hdr.type, 0, 0, -1, &fm,
sizeof fm);
evflags |= EV_WRITE;
break;
case STATUS_WAITING:
/* waiting for asynchronous call ... */
break;
}
imsg_free(&imsg);
}
event_set(&fi.ev, 0, evflags, filter_handler, &fi);
event_add(&fi.ev, NULL);
return;
ignore:
imsg_free(&imsg);
fm.code = STATUS_IGNORE;
imsg_compose(&fi.ibuf, imsg.hdr.type, 0, 0, -1, &fm, sizeof fm);
evflags |= EV_WRITE;
event_set(&fi.ev, 0, evflags, filter_handler, &fi);
event_add(&fi.ev, NULL);
}
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