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/*-
* Copyright 2016 Vsevolod Stakhov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include "rspamd.h"
#include "proxy.h"
#include "unix-std.h"
static void rspamd_proxy_backend_handler (gint fd, gshort what, gpointer data);
static void rspamd_proxy_client_handler (gint fd, gshort what, gpointer data);
static inline GQuark
proxy_error_quark (void)
{
return g_quark_from_static_string ("proxy-error");
}
void
rspamd_proxy_close (rspamd_proxy_t *proxy)
{
if (!proxy->closed) {
close (proxy->cfd);
close (proxy->bfd);
event_del (&proxy->client_ev);
event_del (&proxy->backend_ev);
proxy->closed = TRUE;
}
}
static void
rspamd_proxy_client_handler (gint fd, gshort what, gpointer data)
{
rspamd_proxy_t *proxy = data;
gint r;
GError *err = NULL;
if (what == EV_READ) {
/* Got data from client */
event_del (&proxy->client_ev);
r = read (proxy->cfd, proxy->buf, proxy->bufsize);
if (r > 0) {
/* Write this buffer to backend */
proxy->read_len = r;
proxy->buf_offset = 0;
event_del (&proxy->backend_ev);
event_set (&proxy->backend_ev,
proxy->bfd,
EV_WRITE,
rspamd_proxy_backend_handler,
proxy);
event_add (&proxy->backend_ev, proxy->tv);
}
else {
/* Error case or zero reply */
if (r < 0) {
/* Error case */
g_set_error (&err,
proxy_error_quark (), r, "Client read error: %s",
strerror (errno));
rspamd_proxy_close (proxy);
proxy->err_cb (err, proxy->user_data);
}
else {
/* Client closes connection */
rspamd_proxy_close (proxy);
proxy->err_cb (NULL, proxy->user_data);
}
}
}
else if (what == EV_WRITE) {
/* Can write to client */
r = write (proxy->cfd,
proxy->buf + proxy->buf_offset,
proxy->read_len - proxy->buf_offset);
if (r > 0) {
/* We wrote something */
proxy->buf_offset += r;
if (proxy->buf_offset == proxy->read_len) {
/* We wrote everything */
event_del (&proxy->client_ev);
event_set (&proxy->client_ev,
proxy->cfd,
EV_READ,
rspamd_proxy_client_handler,
proxy);
event_add (&proxy->client_ev, proxy->tv);
event_del (&proxy->backend_ev);
event_set (&proxy->backend_ev,
proxy->bfd,
EV_READ,
rspamd_proxy_backend_handler,
proxy);
event_add (&proxy->backend_ev, proxy->tv);
}
else {
/* Plan another write event */
event_add (&proxy->backend_ev, proxy->tv);
}
}
else {
/* Error case or zero reply */
if (r < 0) {
/* Error case */
g_set_error (&err,
proxy_error_quark (), r, "Client write error: %s",
strerror (errno));
rspamd_proxy_close (proxy);
proxy->err_cb (err, proxy->user_data);
}
else {
/* Client closes connection */
rspamd_proxy_close (proxy);
proxy->err_cb (NULL, proxy->user_data);
}
}
}
else {
/* Got timeout */
g_set_error (&err, proxy_error_quark (), ETIMEDOUT, "Client timeout");
rspamd_proxy_close (proxy);
proxy->err_cb (err, proxy->user_data);
}
}
static void
rspamd_proxy_backend_handler (gint fd, gshort what, gpointer data)
{
rspamd_proxy_t *proxy = data;
gint r;
GError *err = NULL;
if (what == EV_READ) {
/* Got data from backend */
event_del (&proxy->backend_ev);
r = read (proxy->bfd, proxy->buf, proxy->bufsize);
if (r > 0) {
/* Write this buffer to client */
proxy->read_len = r;
proxy->buf_offset = 0;
event_del (&proxy->client_ev);
event_set (&proxy->client_ev,
proxy->bfd,
EV_WRITE,
rspamd_proxy_client_handler,
proxy);
event_add (&proxy->client_ev, proxy->tv);
}
else {
/* Error case or zero reply */
if (r < 0) {
/* Error case */
g_set_error (&err,
proxy_error_quark (), r, "Backend read error: %s",
strerror (errno));
rspamd_proxy_close (proxy);
proxy->err_cb (err, proxy->user_data);
}
else {
/* Client closes connection */
rspamd_proxy_close (proxy);
proxy->err_cb (NULL, proxy->user_data);
}
}
}
else if (what == EV_WRITE) {
/* Can write to backend */
r = write (proxy->bfd,
proxy->buf + proxy->buf_offset,
proxy->read_len - proxy->buf_offset);
if (r > 0) {
/* We wrote something */
proxy->buf_offset += r;
if (proxy->buf_offset == proxy->read_len) {
/* We wrote everything */
event_del (&proxy->backend_ev);
event_set (&proxy->backend_ev,
proxy->bfd,
EV_READ,
rspamd_proxy_backend_handler,
proxy);
event_add (&proxy->backend_ev, proxy->tv);
event_del (&proxy->client_ev);
event_set (&proxy->client_ev,
proxy->cfd,
EV_READ,
rspamd_proxy_client_handler,
proxy);
event_add (&proxy->client_ev, proxy->tv);
}
else {
/* Plan another write event */
event_add (&proxy->backend_ev, proxy->tv);
}
}
else {
/* Error case or zero reply */
if (r < 0) {
/* Error case */
g_set_error (&err,
proxy_error_quark (), r, "Backend write error: %s",
strerror (errno));
rspamd_proxy_close (proxy);
proxy->err_cb (err, proxy->user_data);
}
else {
/* Client closes connection */
rspamd_proxy_close (proxy);
proxy->err_cb (NULL, proxy->user_data);
}
}
}
else {
/* Got timeout */
g_set_error (&err, proxy_error_quark (), ETIMEDOUT, "Client timeout");
rspamd_proxy_close (proxy);
proxy->err_cb (err, proxy->user_data);
}
}
/**
* Create new proxy between cfd and bfd
* @param cfd client's socket
* @param bfd backend's socket
* @param bufsize size of exchange buffer
* @param err_cb callback for erorrs or completing
* @param ud user data for callback
* @return new proxy object
*/
rspamd_proxy_t *
rspamd_create_proxy (gint cfd,
gint bfd,
rspamd_mempool_t *pool,
struct event_base *base,
gsize bufsize,
struct timeval *tv,
dispatcher_err_callback_t err_cb,
gpointer ud)
{
rspamd_proxy_t *new;
new = rspamd_mempool_alloc0 (pool, sizeof (rspamd_proxy_t));
new->cfd = dup (cfd);
new->bfd = dup (bfd);
new->pool = pool;
new->base = base;
new->bufsize = bufsize;
new->buf = rspamd_mempool_alloc (pool, bufsize);
new->err_cb = err_cb;
new->user_data = ud;
new->tv = tv;
/* Set client's and backend's interfaces to read events */
event_set (&new->client_ev,
new->cfd,
EV_READ,
rspamd_proxy_client_handler,
new);
event_base_set (new->base, &new->client_ev);
event_add (&new->client_ev, new->tv);
event_set (&new->backend_ev,
new->bfd,
EV_READ,
rspamd_proxy_backend_handler,
new);
event_base_set (new->base, &new->backend_ev);
event_add (&new->backend_ev, new->tv);
return new;
}
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