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de15a34dc8
Use we you are proxying to a server that has multiple upgrade on the same IP/Port. PR 61142 git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1801594 13f79535-47bb-0310-9956-ffa450edef68
593 lines
22 KiB
C
593 lines
22 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mod_proxy.h"
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#include "ap_mpm.h"
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module AP_MODULE_DECLARE_DATA proxy_wstunnel_module;
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typedef struct {
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int mpm_can_poll;
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apr_time_t idle_timeout;
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apr_time_t async_delay;
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} proxyws_dir_conf;
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typedef struct ws_baton_t {
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request_rec *r;
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proxy_conn_rec *proxy_connrec;
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apr_socket_t *server_soc;
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apr_socket_t *client_soc;
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apr_pollset_t *pollset;
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apr_bucket_brigade *bb_i;
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apr_bucket_brigade *bb_o;
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apr_pool_t *subpool; /* cleared before each suspend, destroyed when request ends */
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char *scheme; /* required to release the proxy connection */
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} ws_baton_t;
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static void proxy_wstunnel_callback(void *b);
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static int proxy_wstunnel_pump(ws_baton_t *baton, apr_time_t timeout, int try_poll) {
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request_rec *r = baton->r;
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conn_rec *c = r->connection;
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proxy_conn_rec *conn = baton->proxy_connrec;
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apr_socket_t *sock = conn->sock;
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conn_rec *backconn = conn->connection;
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const apr_pollfd_t *signalled;
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apr_int32_t pollcnt, pi;
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apr_int16_t pollevent;
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apr_pollset_t *pollset = baton->pollset;
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apr_socket_t *client_socket = baton->client_soc;
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apr_status_t rv;
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apr_bucket_brigade *bb_i = baton->bb_i;
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apr_bucket_brigade *bb_o = baton->bb_o;
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int done = 0, replied = 0;
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do {
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rv = apr_pollset_poll(pollset, timeout, &pollcnt, &signalled);
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if (rv != APR_SUCCESS) {
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if (APR_STATUS_IS_EINTR(rv)) {
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continue;
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}
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else if (APR_STATUS_IS_TIMEUP(rv)) {
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if (try_poll) {
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ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(02542) "Attempting to go async");
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return SUSPENDED;
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}
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else {
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ap_log_rerror(APLOG_MARK, APLOG_TRACE1, rv, r, APLOGNO(10031) "Closing idle tunnel");
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return HTTP_REQUEST_TIME_OUT;
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}
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}
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else {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(02444) "error apr_poll()");
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return HTTP_INTERNAL_SERVER_ERROR;
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}
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}
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ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, APLOGNO(02445)
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"woke from poll(), i=%d", pollcnt);
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for (pi = 0; pi < pollcnt; pi++) {
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const apr_pollfd_t *cur = &signalled[pi];
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if (cur->desc.s == sock) {
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pollevent = cur->rtnevents;
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if (pollevent & (APR_POLLIN | APR_POLLHUP)) {
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ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, APLOGNO(02446)
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"backend was readable");
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done |= ap_proxy_transfer_between_connections(r, backconn,
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c, bb_i, bb_o,
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"backend",
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&replied,
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AP_IOBUFSIZE,
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0)
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!= APR_SUCCESS;
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}
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else if (pollevent & APR_POLLERR) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02447)
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"error on backend connection");
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backconn->aborted = 1;
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done = 1;
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}
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else {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02605)
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"unknown event on backconn %d", pollevent);
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done = 1;
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}
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}
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else if (cur->desc.s == client_socket) {
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pollevent = cur->rtnevents;
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if (pollevent & (APR_POLLIN | APR_POLLHUP)) {
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ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, APLOGNO(02448)
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"client was readable");
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done |= ap_proxy_transfer_between_connections(r, c, backconn,
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bb_o, bb_i,
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"client", NULL,
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AP_IOBUFSIZE,
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0)
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!= APR_SUCCESS;
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}
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else if (pollevent & APR_POLLERR) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02607)
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"error on client connection");
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c->aborted = 1;
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done = 1;
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}
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else {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02606)
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"unknown event on client conn %d", pollevent);
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done = 1;
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}
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}
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else {
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ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(02449)
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"unknown socket in pollset");
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done = 1;
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}
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}
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} while (!done);
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ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
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"finished with poll() - cleaning up");
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if (!replied) {
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return HTTP_BAD_GATEWAY;
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}
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else {
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return OK;
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}
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}
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static void proxy_wstunnel_finish(ws_baton_t *baton) {
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ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, baton->r, "proxy_wstunnel_finish");
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baton->proxy_connrec->close = 1; /* new handshake expected on each back-conn */
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baton->r->connection->keepalive = AP_CONN_CLOSE;
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ap_proxy_release_connection(baton->scheme, baton->proxy_connrec, baton->r->server);
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ap_finalize_request_protocol(baton->r);
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ap_lingering_close(baton->r->connection);
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apr_socket_close(baton->client_soc);
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ap_mpm_resume_suspended(baton->r->connection);
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ap_process_request_after_handler(baton->r); /* don't touch baton or r after here */
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}
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/* If neither socket becomes readable in the specified timeout,
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* this callback will kill the request. We do not have to worry about
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* having a cancel and a IO both queued.
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*/
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static void proxy_wstunnel_cancel_callback(void *b)
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{
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ws_baton_t *baton = (ws_baton_t*)b;
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ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, baton->r, "proxy_wstunnel_cancel_callback, IO timed out");
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proxy_wstunnel_finish(baton);
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return;
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}
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/* Invoked by the event loop when data is ready on either end.
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* Pump both ends until they'd block and then start over again
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* We don't need the invoke_mtx, since we never put multiple callback events
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* in the queue.
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*/
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static void proxy_wstunnel_callback(void *b) {
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int status;
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ws_baton_t *baton = (ws_baton_t*)b;
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proxyws_dir_conf *dconf = ap_get_module_config(baton->r->per_dir_config, &proxy_wstunnel_module);
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apr_pool_clear(baton->subpool);
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status = proxy_wstunnel_pump(baton, dconf->async_delay, dconf->mpm_can_poll);
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if (status == SUSPENDED) {
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apr_pollfd_t *pfd;
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apr_array_header_t *pfds = apr_array_make(baton->subpool, 2, sizeof(apr_pollfd_t));
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pfd = apr_array_push(pfds);
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pfd->desc_type = APR_POLL_SOCKET;
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pfd->reqevents = APR_POLLIN | APR_POLLERR | APR_POLLHUP;
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pfd->desc.s = baton->client_soc;
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pfd->p = baton->subpool;
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pfd = apr_array_push(pfds);
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pfd->desc_type = APR_POLL_SOCKET;
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pfd->reqevents = APR_POLLIN | APR_POLLERR | APR_POLLHUP;
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pfd->desc.s = baton->server_soc;
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pfd->p = baton->subpool;
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ap_mpm_register_poll_callback_timeout(pfds,
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proxy_wstunnel_callback,
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proxy_wstunnel_cancel_callback,
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baton,
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dconf->idle_timeout);
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ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, baton->r, "proxy_wstunnel_callback suspend");
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}
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else {
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proxy_wstunnel_finish(baton);
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}
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}
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/*
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* Canonicalise http-like URLs.
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* scheme is the scheme for the URL
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* url is the URL starting with the first '/'
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* def_port is the default port for this scheme.
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*/
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static int proxy_wstunnel_canon(request_rec *r, char *url)
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{
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char *host, *path, sport[7];
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char *search = NULL;
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const char *err;
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char *scheme;
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apr_port_t port, def_port;
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/* ap_port_of_scheme() */
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if (ap_cstr_casecmpn(url, "ws:", 3) == 0) {
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url += 3;
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scheme = "ws:";
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def_port = apr_uri_port_of_scheme("http");
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}
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else if (ap_cstr_casecmpn(url, "wss:", 4) == 0) {
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url += 4;
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scheme = "wss:";
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def_port = apr_uri_port_of_scheme("https");
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}
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else {
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return DECLINED;
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}
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port = def_port;
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ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "canonicalising URL %s", url);
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/*
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* do syntactic check.
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* We break the URL into host, port, path, search
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*/
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err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port);
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if (err) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02439) "error parsing URL %s: %s",
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url, err);
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return HTTP_BAD_REQUEST;
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}
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/*
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* now parse path/search args, according to rfc1738:
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* process the path. With proxy-nocanon set (by
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* mod_proxy) we use the raw, unparsed uri
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*/
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if (apr_table_get(r->notes, "proxy-nocanon")) {
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path = url; /* this is the raw path */
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}
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else {
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path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, 0,
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r->proxyreq);
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search = r->args;
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}
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if (path == NULL)
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return HTTP_BAD_REQUEST;
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apr_snprintf(sport, sizeof(sport), ":%d", port);
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if (ap_strchr_c(host, ':')) {
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/* if literal IPv6 address */
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host = apr_pstrcat(r->pool, "[", host, "]", NULL);
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}
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r->filename = apr_pstrcat(r->pool, "proxy:", scheme, "//", host, sport,
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"/", path, (search) ? "?" : "",
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(search) ? search : "", NULL);
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return OK;
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}
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/*
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* process the request and write the response.
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*/
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static int proxy_wstunnel_request(apr_pool_t *p, request_rec *r,
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proxy_conn_rec *conn,
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proxy_worker *worker,
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proxy_server_conf *conf,
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apr_uri_t *uri,
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char *url, char *server_portstr, char *scheme)
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{
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apr_status_t rv;
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apr_pollset_t *pollset;
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apr_pollfd_t pollfd;
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conn_rec *c = r->connection;
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apr_socket_t *sock = conn->sock;
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conn_rec *backconn = conn->connection;
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char *buf;
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apr_bucket_brigade *header_brigade;
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apr_bucket *e;
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char *old_cl_val = NULL;
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char *old_te_val = NULL;
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apr_bucket_brigade *bb = apr_brigade_create(p, c->bucket_alloc);
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apr_socket_t *client_socket = ap_get_conn_socket(c);
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ws_baton_t *baton = apr_pcalloc(r->pool, sizeof(ws_baton_t));
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int status;
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proxyws_dir_conf *dconf = ap_get_module_config(r->per_dir_config, &proxy_wstunnel_module);
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const char *upgrade_method = *worker->s->upgrade ? worker->s->upgrade : "WebSocket";
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header_brigade = apr_brigade_create(p, backconn->bucket_alloc);
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ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, "sending request");
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rv = ap_proxy_create_hdrbrgd(p, header_brigade, r, conn,
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worker, conf, uri, url, server_portstr,
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&old_cl_val, &old_te_val);
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if (rv != OK) {
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return rv;
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}
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if (ap_cstr_casecmp(upgrade_method, "NONE") == 0) {
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buf = apr_pstrdup(p, "Upgrade: WebSocket" CRLF "Connection: Upgrade" CRLF CRLF);
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} else if (ap_cstr_casecmp(upgrade_method, "ANY") == 0) {
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const char *upgrade;
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upgrade = apr_table_get(r->headers_in, "Upgrade");
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buf = apr_pstrcat(p, "Upgrade: ", upgrade, CRLF "Connection: Upgrade" CRLF CRLF, NULL);
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} else {
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buf = apr_pstrcat(p, "Upgrade: ", upgrade_method, CRLF "Connection: Upgrade" CRLF CRLF, NULL);
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}
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ap_xlate_proto_to_ascii(buf, strlen(buf));
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e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
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APR_BRIGADE_INSERT_TAIL(header_brigade, e);
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if ((rv = ap_proxy_pass_brigade(backconn->bucket_alloc, r, conn, backconn,
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header_brigade, 1)) != OK)
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return rv;
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apr_brigade_cleanup(header_brigade);
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ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, "setting up poll()");
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if ((rv = apr_pollset_create(&pollset, 2, p, 0)) != APR_SUCCESS) {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(02443)
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"error apr_pollset_create()");
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return HTTP_INTERNAL_SERVER_ERROR;
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}
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#if 0
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apr_socket_opt_set(sock, APR_SO_NONBLOCK, 1);
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apr_socket_opt_set(sock, APR_SO_KEEPALIVE, 1);
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apr_socket_opt_set(client_socket, APR_SO_NONBLOCK, 1);
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apr_socket_opt_set(client_socket, APR_SO_KEEPALIVE, 1);
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#endif
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pollfd.p = p;
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pollfd.desc_type = APR_POLL_SOCKET;
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pollfd.reqevents = APR_POLLIN | APR_POLLHUP;
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pollfd.desc.s = sock;
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pollfd.client_data = NULL;
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apr_pollset_add(pollset, &pollfd);
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pollfd.desc.s = client_socket;
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apr_pollset_add(pollset, &pollfd);
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ap_remove_input_filter_byhandle(c->input_filters, "reqtimeout");
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r->output_filters = c->output_filters;
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r->proto_output_filters = c->output_filters;
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r->input_filters = c->input_filters;
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r->proto_input_filters = c->input_filters;
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/* This handler should take care of the entire connection; make it so that
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* nothing else is attempted on the connection after returning. */
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c->keepalive = AP_CONN_CLOSE;
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baton->r = r;
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baton->pollset = pollset;
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baton->client_soc = client_socket;
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baton->server_soc = sock;
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baton->proxy_connrec = conn;
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baton->bb_o = bb;
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baton->bb_i = header_brigade;
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baton->scheme = scheme;
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apr_pool_create(&baton->subpool, r->pool);
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if (!dconf->mpm_can_poll) {
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status = proxy_wstunnel_pump(baton, dconf->idle_timeout, dconf->mpm_can_poll);
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}
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else {
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status = proxy_wstunnel_pump(baton, dconf->async_delay, dconf->mpm_can_poll);
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apr_pool_clear(baton->subpool);
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if (status == SUSPENDED) {
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apr_pollfd_t *pfd;
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apr_array_header_t *pfds = apr_array_make(baton->subpool, 2, sizeof(apr_pollfd_t));
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pfd = apr_array_push(pfds);
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pfd->desc_type = APR_POLL_SOCKET;
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pfd->reqevents = APR_POLLIN | APR_POLLERR | APR_POLLHUP;
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pfd->desc.s = baton->client_soc;
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pfd->p = baton->subpool;
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pfd = apr_array_push(pfds);
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pfd->desc_type = APR_POLL_SOCKET;
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pfd->reqevents = APR_POLLIN | APR_POLLERR | APR_POLLHUP;
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pfd->desc.s = baton->server_soc;
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pfd->p = baton->subpool;
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rv = ap_mpm_register_poll_callback_timeout(pfds,
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proxy_wstunnel_callback,
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proxy_wstunnel_cancel_callback,
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baton,
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dconf->idle_timeout);
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if (rv == APR_SUCCESS) {
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return SUSPENDED;
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}
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else if (APR_STATUS_IS_ENOTIMPL(rv)) {
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ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(02544) "No async support");
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status = proxy_wstunnel_pump(baton, dconf->idle_timeout, 0); /* force no async */
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}
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else {
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ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
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APLOGNO(02543) "error creating websockets tunnel");
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return HTTP_INTERNAL_SERVER_ERROR;
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}
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|
}
|
|
}
|
|
|
|
if (status != OK) {
|
|
/* Avoid sending error pages down an upgraded connection */
|
|
if (status != HTTP_REQUEST_TIME_OUT) {
|
|
r->status = status;
|
|
}
|
|
status = OK;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
*/
|
|
static int proxy_wstunnel_handler(request_rec *r, proxy_worker *worker,
|
|
proxy_server_conf *conf,
|
|
char *url, const char *proxyname,
|
|
apr_port_t proxyport)
|
|
{
|
|
int status;
|
|
char server_portstr[32];
|
|
proxy_conn_rec *backend = NULL;
|
|
char *scheme;
|
|
apr_pool_t *p = r->pool;
|
|
char *locurl = url;
|
|
apr_uri_t *uri;
|
|
int is_ssl = 0;
|
|
const char *upgrade_method = *worker->s->upgrade ? worker->s->upgrade : "WebSocket";
|
|
|
|
if (ap_cstr_casecmpn(url, "wss:", 4) == 0) {
|
|
scheme = "WSS";
|
|
is_ssl = 1;
|
|
}
|
|
else if (ap_cstr_casecmpn(url, "ws:", 3) == 0) {
|
|
scheme = "WS";
|
|
}
|
|
else {
|
|
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02450) "declining URL %s", url);
|
|
return DECLINED;
|
|
}
|
|
|
|
if (ap_cstr_casecmp(upgrade_method, "NONE") != 0) {
|
|
const char *upgrade;
|
|
upgrade = apr_table_get(r->headers_in, "Upgrade");
|
|
if (!upgrade || (ap_cstr_casecmp(upgrade, upgrade_method) != 0 &&
|
|
ap_cstr_casecmp(upgrade_method, "ANY") !=0)) {
|
|
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02900)
|
|
"declining URL %s (not %s, Upgrade: header is %s)",
|
|
url, upgrade_method, upgrade ? upgrade : "missing");
|
|
return DECLINED;
|
|
}
|
|
}
|
|
|
|
uri = apr_palloc(p, sizeof(*uri));
|
|
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02451) "serving URL %s", url);
|
|
|
|
/* create space for state information */
|
|
status = ap_proxy_acquire_connection(scheme, &backend, worker, r->server);
|
|
if (status != OK) {
|
|
goto cleanup;
|
|
}
|
|
|
|
backend->is_ssl = is_ssl;
|
|
backend->close = 0;
|
|
|
|
/* Step One: Determine Who To Connect To */
|
|
status = ap_proxy_determine_connection(p, r, conf, worker, backend,
|
|
uri, &locurl, proxyname, proxyport,
|
|
server_portstr,
|
|
sizeof(server_portstr));
|
|
if (status != OK) {
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Step Two: Make the Connection */
|
|
if (ap_proxy_connect_backend(scheme, backend, worker, r->server)) {
|
|
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02452)
|
|
"failed to make connection to backend: %s",
|
|
backend->hostname);
|
|
status = HTTP_SERVICE_UNAVAILABLE;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Step Three: Create conn_rec */
|
|
if (!backend->connection) {
|
|
status = ap_proxy_connection_create_ex(scheme, backend, r);
|
|
if (status != OK) {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
/* Step Three: Process the Request */
|
|
status = proxy_wstunnel_request(p, r, backend, worker, conf, uri, locurl,
|
|
server_portstr, scheme);
|
|
|
|
cleanup:
|
|
/* Do not close the socket */
|
|
if (backend && status != SUSPENDED) {
|
|
backend->close = 1;
|
|
ap_proxy_release_connection(scheme, backend, r->server);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static void *create_proxyws_dir_config(apr_pool_t *p, char *dummy)
|
|
{
|
|
proxyws_dir_conf *new =
|
|
(proxyws_dir_conf *) apr_pcalloc(p, sizeof(proxyws_dir_conf));
|
|
|
|
new->idle_timeout = -1; /* no timeout */
|
|
|
|
ap_mpm_query(AP_MPMQ_CAN_POLL, &new->mpm_can_poll);
|
|
|
|
return (void *) new;
|
|
}
|
|
|
|
static const char * proxyws_set_idle(cmd_parms *cmd, void *conf, const char *val)
|
|
{
|
|
proxyws_dir_conf *dconf = conf;
|
|
if (ap_timeout_parameter_parse(val, &(dconf->idle_timeout), "s") != APR_SUCCESS)
|
|
return "ProxyWebsocketIdleTimeout timeout has wrong format";
|
|
return NULL;
|
|
}
|
|
static const char * proxyws_set_aysnch_delay(cmd_parms *cmd, void *conf, const char *val)
|
|
{
|
|
proxyws_dir_conf *dconf = conf;
|
|
if (ap_timeout_parameter_parse(val, &(dconf->async_delay), "s") != APR_SUCCESS)
|
|
return "ProxyWebsocketAsyncDelay timeout has wrong format";
|
|
return NULL;
|
|
}
|
|
|
|
static const command_rec ws_proxy_cmds[] =
|
|
{
|
|
AP_INIT_TAKE1("ProxyWebsocketIdleTimeout", proxyws_set_idle, NULL, RSRC_CONF|ACCESS_CONF,
|
|
"timeout for activity in either direction, unlimited by default"),
|
|
|
|
AP_INIT_TAKE1("ProxyWebsocketAsyncDelay", proxyws_set_aysnch_delay, NULL, RSRC_CONF|ACCESS_CONF,
|
|
"amount of time to poll before going asynchronous"),
|
|
{NULL}
|
|
};
|
|
|
|
static void ap_proxy_http_register_hook(apr_pool_t *p)
|
|
{
|
|
static const char * const aszSucc[] = { "mod_proxy_http.c", NULL};
|
|
proxy_hook_scheme_handler(proxy_wstunnel_handler, NULL, aszSucc, APR_HOOK_FIRST);
|
|
proxy_hook_canon_handler(proxy_wstunnel_canon, NULL, aszSucc, APR_HOOK_FIRST);
|
|
}
|
|
|
|
AP_DECLARE_MODULE(proxy_wstunnel) = {
|
|
STANDARD20_MODULE_STUFF,
|
|
create_proxyws_dir_config, /* create per-directory config structure */
|
|
NULL, /* merge per-directory config structures */
|
|
NULL, /* create per-server config structure */
|
|
NULL, /* merge per-server config structures */
|
|
ws_proxy_cmds, /* command apr_table_t */
|
|
ap_proxy_http_register_hook /* register hooks */
|
|
};
|