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/* Copyright (c) 2010-2012, Vsevolod Stakhov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "main.h"
#include "proxy.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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