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484 lines
15 KiB
C
484 lines
15 KiB
C
/*-
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* SSLsplit - transparent SSL/TLS interception
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* https://www.roe.ch/SSLsplit
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*
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* Copyright (c) 2009-2018, Daniel Roethlisberger <daniel@roe.ch>.
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* Copyright (c) 2017-2019, Soner Tari <sonertari@gmail.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "protopassthrough.h"
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#include "prototcp.h"
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#include <sys/param.h>
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#ifdef HAVE_LOCAL_PROCINFO
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static int NONNULL(1)
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protopassthrough_prepare_logging(pxy_conn_ctx_t *ctx)
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{
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/* prepare logging, part 2 */
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if (WANT_CONNECT_LOG(ctx)) {
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return pxy_prepare_logging_local_procinfo(ctx);
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}
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return 0;
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}
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#endif /* HAVE_LOCAL_PROCINFO */
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static void NONNULL(1)
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protopassthrough_log_dbg_connect_type(pxy_conn_ctx_t *ctx)
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{
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if (OPTS_DEBUG(ctx->opts)) {
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/* for TCP, we get only a dst connect event,
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* since src was already connected from the
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* beginning */
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log_dbg_printf("PASSTHROUGH connected to [%s]:%s\n",
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STRORDASH(ctx->dsthost_str), STRORDASH(ctx->dstport_str));
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log_dbg_printf("PASSTHROUGH connected from [%s]:%s\n",
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STRORDASH(ctx->srchost_str), STRORDASH(ctx->srcport_str));
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}
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}
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static void NONNULL(1)
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protopassthrough_log_connect(pxy_conn_ctx_t *ctx)
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{
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if (WANT_CONNECT_LOG(ctx)) {
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pxy_log_connect_nonhttp(ctx);
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}
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protopassthrough_log_dbg_connect_type(ctx);
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}
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/*
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* We cannot redirect failed ssl connections to login page while switching
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* to passthrough mode, because redirect message should be sent over ssl,
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* but it has failed (that's why we are engaging the passthrough mode).
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*/
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void
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protopassthrough_engage(pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINE, "protopassthrough_engage: ENTER, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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// @todo When we call bufferevent_free_and_close_fd(), connection stalls due to ssl shutdown?
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// We get srvdst writecb while ssl shutdown is still in progress, and srvdst readcb never fires
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ctx->srvdst.free(ctx->srvdst.bev, ctx);
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ctx->srvdst.bev = NULL;
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ctx->srvdst.ssl = NULL;
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ctx->connected = 0;
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ctx->srvdst_connected = 0;
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// Close and free dst if open
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if (!ctx->dst.closed) {
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ctx->dst.closed = 1;
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ctx->dst.free(ctx->dst.bev, ctx);
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ctx->dst.bev = NULL;
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ctx->dst_fd = 0;
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}
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// Free any children of the previous proto
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pxy_conn_free_children(ctx);
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// Free any/all data of the previous proto
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if (ctx->protoctx->proto_free) {
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ctx->protoctx->proto_free(ctx);
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// Disable proto_free callback of the previous proto, otherwise it is called while passthrough is closing too
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ctx->protoctx->proto_free = NULL;
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}
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ctx->proto = protopassthrough_setup(ctx);
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ctx->protoctx->fd_readcb(ctx->fd, 0, ctx);
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}
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static int NONNULL(1) WUNRES
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protopassthrough_conn_connect(pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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// Make a copy of fd, to prevent multithreading issues in case the conn is terminated
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int fd = ctx->fd;
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_conn_connect: ENTER, fd=%d\n", fd);
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#endif /* DEBUG_PROXY */
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if (prototcp_setup_srvdst(ctx) == -1) {
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return -1;
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}
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// Conn setup is successful, so add the conn to the conn list of its thread now
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pxy_thrmgr_add_conn(ctx);
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// @attention Sometimes dst write cb fires but not event cb, especially if this listener cb is not finished yet, so the conn stalls.
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bufferevent_setcb(ctx->srvdst.bev, pxy_bev_readcb, pxy_bev_writecb, pxy_bev_eventcb, ctx);
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/* initiate connection */
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if (bufferevent_socket_connect(ctx->srvdst.bev, (struct sockaddr *)&ctx->dstaddr, ctx->dstaddrlen) == -1) {
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log_err_level_printf(LOG_CRIT, "protopassthrough_conn_connect: bufferevent_socket_connect for srvdst failed\n");
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINE, "protopassthrough_conn_connect: bufferevent_socket_connect for srvdst failed, fd=%d\n", fd);
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#endif /* DEBUG_PROXY */
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// @attention Do not try to term/close conns or do anything else with conn ctx on the thrmgr thread after setting event callbacks and/or socket connect. Just return 0.
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}
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return 0;
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}
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static void NONNULL(1)
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protopassthrough_bev_readcb_src(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_bev_readcb_src: ENTER, size=%zu, fd=%d\n",
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evbuffer_get_length(bufferevent_get_input(bev)), ctx->fd);
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#endif /* DEBUG_PROXY */
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// Passthrough packets are transfered between src and srvdst
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if (ctx->srvdst.closed) {
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pxy_discard_inbuf(bev);
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return;
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}
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if (prototcp_try_send_userauth_msg(bev, ctx)) {
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return;
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}
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evbuffer_add_buffer(bufferevent_get_output(ctx->srvdst.bev), bufferevent_get_input(bev));
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pxy_try_set_watermark(bev, ctx, ctx->srvdst.bev);
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}
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static void NONNULL(1)
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protopassthrough_bev_readcb_srvdst(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_bev_readcb_srvdst: ENTER, size=%zu, fd=%d\n",
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evbuffer_get_length(bufferevent_get_input(bev)), ctx->fd);
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#endif /* DEBUG_PROXY */
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// Passthrough packets are transfered between src and srvdst
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if (ctx->src.closed) {
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pxy_discard_inbuf(bev);
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return;
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}
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evbuffer_add_buffer(bufferevent_get_output(ctx->src.bev), bufferevent_get_input(bev));
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pxy_try_set_watermark(bev, ctx, ctx->src.bev);
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}
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static void NONNULL(1)
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protopassthrough_bev_writecb_src(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_bev_writecb_src: ENTER, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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if (prototcp_try_close_unauth_conn(bev, ctx)) {
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return;
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}
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// @attention srvdst.bev may be NULL
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if (ctx->srvdst.closed) {
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if (pxy_try_close_conn_end(&ctx->src, ctx)) {
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_bev_writecb_src: other->closed, terminate conn, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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pxy_conn_term(ctx, 1);
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}
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return;
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}
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pxy_try_unset_watermark(bev, ctx, &ctx->srvdst);
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}
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static void NONNULL(1)
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protopassthrough_bev_writecb_srvdst(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_bev_writecb_srvdst: ENTER, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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if (!ctx->srvdst_connected) {
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if (pxy_connect_srvdst(bev, ctx) == -1) {
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return;
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}
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}
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if (ctx->src.closed) {
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if (pxy_try_close_conn_end(&ctx->srvdst, ctx) == 1) {
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_bev_writecb_srvdst: other->closed, terminate conn, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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pxy_conn_term(ctx, 0);
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}
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return;
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}
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pxy_try_unset_watermark(bev, ctx, &ctx->src);
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}
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static void NONNULL(1,2)
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protopassthrough_bev_eventcb_connected_src(UNUSED struct bufferevent *bev, UNUSED pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_bev_eventcb_connected_src: ENTER, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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}
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static int NONNULL(1)
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protopassthrough_enable_src(pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_enable_src: ENTER, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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if (prototcp_setup_src(ctx) == -1) {
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return -1;
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}
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bufferevent_setcb(ctx->src.bev, pxy_bev_readcb, pxy_bev_writecb, pxy_bev_eventcb, ctx);
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINER, "protopassthrough_enable_src: Enabling src, child_fd=%d, fd=%d\n", ctx->child_fd, ctx->fd);
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#endif /* DEBUG_PROXY */
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// Now open the gates
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bufferevent_enable(ctx->src.bev, EV_READ|EV_WRITE);
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return 0;
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}
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static void NONNULL(1,2)
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protopassthrough_bev_eventcb_connected_srvdst(UNUSED struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_bev_eventcb_connected_srvdst: ENTER, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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if (!ctx->srvdst_connected) {
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ctx->srvdst_connected = 1;
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bufferevent_enable(ctx->srvdst.bev, EV_READ|EV_WRITE);
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}
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if (ctx->srvdst_connected && !ctx->connected) {
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ctx->connected = 1;
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if (protopassthrough_enable_src(ctx) == -1) {
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return;
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}
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}
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if (!ctx->term && !ctx->enomem) {
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pxy_userauth(ctx);
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}
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}
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static void NONNULL(1,2)
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protopassthrough_bev_eventcb_eof_src(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_bev_eventcb_eof_src: ENTER, fd=%d\n", ctx->fd);
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pxy_log_dbg_evbuf_info(ctx, &ctx->src, &ctx->srvdst);
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#endif /* DEBUG_PROXY */
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if (!ctx->connected) {
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log_err_level_printf(LOG_WARNING, "EOF on outbound connection before connection establishment\n");
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINE, "protopassthrough_bev_eventcb_eof_src: EOF on outbound connection before connection establishment, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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ctx->srvdst.closed = 1;
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} else if (!ctx->srvdst.closed) {
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_bev_eventcb_eof_src: !other->closed, terminate conn, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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if (pxy_try_consume_last_input(bev, ctx) == -1) {
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return;
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}
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pxy_try_close_conn_end(&ctx->srvdst, ctx);
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}
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pxy_try_disconnect(ctx, &ctx->src, &ctx->srvdst, 1);
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}
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static void NONNULL(1,2)
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protopassthrough_bev_eventcb_eof_srvdst(struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_bev_eventcb_eof_srvdst: EOF, fd=%d\n", ctx->fd);
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pxy_log_dbg_evbuf_info(ctx, &ctx->srvdst, &ctx->src);
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#endif /* DEBUG_PROXY */
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if (!ctx->connected) {
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log_err_level_printf(LOG_WARNING, "EOF on outbound connection before connection establishment\n");
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINE, "protopassthrough_bev_eventcb_eof_srvdst: EOF on outbound connection before connection establishment, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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ctx->src.closed = 1;
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} else if (!ctx->src.closed) {
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINEST, "protopassthrough_bev_eventcb_eof_srvdst: !other->closed, terminate conn, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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if (pxy_try_consume_last_input(bev, ctx) == -1) {
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return;
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}
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pxy_try_close_conn_end(&ctx->src, ctx);
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}
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pxy_try_disconnect(ctx, &ctx->srvdst, &ctx->src, 0);
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}
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static void NONNULL(1,2)
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protopassthrough_bev_eventcb_error_src(UNUSED struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINE, "protopassthrough_bev_eventcb_error_src: BEV_EVENT_ERROR, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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// Passthrough packets are transfered between src and srvdst
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if (!ctx->connected) {
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ctx->srvdst.closed = 1;
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} else if (!ctx->srvdst.closed) {
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pxy_try_close_conn_end(&ctx->srvdst, ctx);
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}
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pxy_try_disconnect(ctx, &ctx->src, &ctx->srvdst, 1);
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}
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static void NONNULL(1,2)
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protopassthrough_bev_eventcb_error_srvdst(UNUSED struct bufferevent *bev, pxy_conn_ctx_t *ctx)
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{
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#ifdef DEBUG_PROXY
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log_dbg_level_printf(LOG_DBG_MODE_FINE, "protopassthrough_bev_eventcb_error_srvdst: BEV_EVENT_ERROR, fd=%d\n", ctx->fd);
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#endif /* DEBUG_PROXY */
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// Passthrough packets are transfered between src and srvdst
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if (!ctx->connected) {
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ctx->src.closed = 1;
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} else if (!ctx->src.closed) {
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pxy_try_close_conn_end(&ctx->src, ctx);
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}
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pxy_try_disconnect(ctx, &ctx->srvdst, &ctx->src, 0);
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}
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static void NONNULL(1)
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protopassthrough_bev_readcb(struct bufferevent *bev, void *arg)
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{
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pxy_conn_ctx_t *ctx = arg;
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if (bev == ctx->src.bev) {
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protopassthrough_bev_readcb_src(bev, ctx);
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} else if (bev == ctx->srvdst.bev) {
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protopassthrough_bev_readcb_srvdst(bev, ctx);
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} else {
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log_err_printf("protopassthrough_bev_readcb: UNKWN conn end\n");
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}
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}
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static void NONNULL(1)
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protopassthrough_bev_writecb(struct bufferevent *bev, void *arg)
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{
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pxy_conn_ctx_t *ctx = arg;
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if (bev == ctx->src.bev) {
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protopassthrough_bev_writecb_src(bev, ctx);
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} else if (bev == ctx->srvdst.bev) {
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protopassthrough_bev_writecb_srvdst(bev, ctx);
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} else {
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log_err_printf("protopassthrough_bev_writecb: UNKWN conn end\n");
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}
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}
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static void NONNULL(1)
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protopassthrough_bev_eventcb_src(struct bufferevent *bev, short events, pxy_conn_ctx_t *ctx)
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{
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if (events & BEV_EVENT_CONNECTED) {
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protopassthrough_bev_eventcb_connected_src(bev, ctx);
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} else if (events & BEV_EVENT_EOF) {
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protopassthrough_bev_eventcb_eof_src(bev, ctx);
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} else if (events & BEV_EVENT_ERROR) {
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protopassthrough_bev_eventcb_error_src(bev, ctx);
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}
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}
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static void NONNULL(1)
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protopassthrough_bev_eventcb_srvdst(struct bufferevent *bev, short events, pxy_conn_ctx_t *ctx)
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{
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if (events & BEV_EVENT_CONNECTED) {
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protopassthrough_bev_eventcb_connected_srvdst(bev, ctx);
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} else if (events & BEV_EVENT_EOF) {
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protopassthrough_bev_eventcb_eof_srvdst(bev, ctx);
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} else if (events & BEV_EVENT_ERROR) {
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protopassthrough_bev_eventcb_error_srvdst(bev, ctx);
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}
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}
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static void NONNULL(1)
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protopassthrough_bev_eventcb(struct bufferevent *bev, short events, void *arg)
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{
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pxy_conn_ctx_t *ctx = arg;
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if (bev == ctx->src.bev) {
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protopassthrough_bev_eventcb_src(bev, events, ctx);
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} else if (bev == ctx->srvdst.bev) {
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protopassthrough_bev_eventcb_srvdst(bev, events, ctx);
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} else {
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log_err_printf("protopassthrough_bev_eventcb: UNKWN conn end\n");
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return;
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}
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|
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// The topmost eventcb handles the term and enomem flags, frees the conn
|
|
if (ctx->term || ctx->enomem) {
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|
return;
|
|
}
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|
|
|
if (events & BEV_EVENT_CONNECTED) {
|
|
if (ctx->connected) {
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// @attention dstaddr may not have been set by the original proto.
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|
if (pxy_set_dstaddr(ctx) == -1) {
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return;
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}
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#ifdef HAVE_LOCAL_PROCINFO
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if (protopassthrough_prepare_logging(ctx) == -1) {
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|
return;
|
|
}
|
|
#endif /* HAVE_LOCAL_PROCINFO */
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|
protopassthrough_log_connect(ctx);
|
|
}
|
|
}
|
|
}
|
|
|
|
protocol_t
|
|
protopassthrough_setup(pxy_conn_ctx_t *ctx)
|
|
{
|
|
// @attention Reset all callbacks while switching to passthrough mode, because we should override any/all protocol settings of the previous protocol.
|
|
// This is different from initial protocol setup, which may choose to keep the default tcp settings.
|
|
ctx->protoctx->proto = PROTO_PASSTHROUGH;
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ctx->protoctx->connectcb = protopassthrough_conn_connect;
|
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ctx->protoctx->fd_readcb = prototcp_fd_readcb;
|
|
|
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ctx->protoctx->bev_readcb = protopassthrough_bev_readcb;
|
|
ctx->protoctx->bev_writecb = protopassthrough_bev_writecb;
|
|
ctx->protoctx->bev_eventcb = protopassthrough_bev_eventcb;
|
|
|
|
return PROTO_PASSTHROUGH;
|
|
}
|
|
|
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/* vim: set noet ft=c: */
|