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-rw-r--r--modules/proxy/mod_proxy_wstunnel.c499
1 files changed, 499 insertions, 0 deletions
diff --git a/modules/proxy/mod_proxy_wstunnel.c b/modules/proxy/mod_proxy_wstunnel.c
new file mode 100644
index 0000000..88f86a4
--- /dev/null
+++ b/modules/proxy/mod_proxy_wstunnel.c
@@ -0,0 +1,499 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 "mod_proxy.h"
+#include "http_config.h"
+
+module AP_MODULE_DECLARE_DATA proxy_wstunnel_module;
+
+typedef struct {
+ unsigned int fallback_to_proxy_http :1,
+ fallback_to_proxy_http_set :1;
+} proxyws_dir_conf;
+
+static int can_fallback_to_proxy_http;
+
+static int proxy_wstunnel_check_trans(request_rec *r, const char *url)
+{
+ proxyws_dir_conf *dconf = ap_get_module_config(r->per_dir_config,
+ &proxy_wstunnel_module);
+
+ if (can_fallback_to_proxy_http && dconf->fallback_to_proxy_http) {
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, r, "check_trans fallback");
+ return DECLINED;
+ }
+
+ if (ap_cstr_casecmpn(url, "ws:", 3) != 0
+ && ap_cstr_casecmpn(url, "wss:", 4) != 0) {
+ return DECLINED;
+ }
+
+ if (!apr_table_get(r->headers_in, "Upgrade")) {
+ /* No Upgrade, let mod_proxy_http handle it (for instance).
+ * Note: anything but OK/DECLINED will do (i.e. bypass wstunnel w/o
+ * aborting the request), HTTP_UPGRADE_REQUIRED is documentary...
+ */
+ return HTTP_UPGRADE_REQUIRED;
+ }
+
+ return OK;
+}
+
+/*
+ * Canonicalise http-like URLs.
+ * scheme is the scheme for the URL
+ * url is the URL starting with the first '/'
+ * def_port is the default port for this scheme.
+ */
+static int proxy_wstunnel_canon(request_rec *r, char *url)
+{
+ proxyws_dir_conf *dconf = ap_get_module_config(r->per_dir_config,
+ &proxy_wstunnel_module);
+ char *host, *path, sport[7];
+ char *search = NULL;
+ const char *err;
+ char *scheme;
+ apr_port_t port, def_port;
+
+ if (can_fallback_to_proxy_http && dconf->fallback_to_proxy_http) {
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, r, "canon fallback");
+ return DECLINED;
+ }
+
+ /* ap_port_of_scheme() */
+ if (ap_cstr_casecmpn(url, "ws:", 3) == 0) {
+ url += 3;
+ scheme = "ws:";
+ def_port = apr_uri_port_of_scheme("http");
+ }
+ else if (ap_cstr_casecmpn(url, "wss:", 4) == 0) {
+ url += 4;
+ scheme = "wss:";
+ def_port = apr_uri_port_of_scheme("https");
+ }
+ else {
+ return DECLINED;
+ }
+
+ port = def_port;
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "canonicalising URL %s", url);
+
+ /*
+ * do syntactic check.
+ * We break the URL into host, port, path, search
+ */
+ err = ap_proxy_canon_netloc(r->pool, &url, NULL, NULL, &host, &port);
+ if (err) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02439) "error parsing URL %s: %s",
+ url, err);
+ return HTTP_BAD_REQUEST;
+ }
+
+ /*
+ * now parse path/search args, according to rfc1738:
+ * process the path. With proxy-nocanon set (by
+ * mod_proxy) we use the raw, unparsed uri
+ */
+ if (apr_table_get(r->notes, "proxy-nocanon")) {
+ path = url; /* this is the raw path */
+ }
+ else {
+ path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, 0,
+ r->proxyreq);
+ search = r->args;
+ if (search && *(ap_scan_vchar_obstext(search))) {
+ /*
+ * We have a raw control character or a ' ' in r->args.
+ * Correct encoding was missed.
+ */
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10409)
+ "To be forwarded query string contains control "
+ "characters or spaces");
+ return HTTP_FORBIDDEN;
+ }
+ }
+ if (path == NULL)
+ return HTTP_BAD_REQUEST;
+
+ if (port != def_port)
+ apr_snprintf(sport, sizeof(sport), ":%d", port);
+ else
+ sport[0] = '\0';
+
+ if (ap_strchr_c(host, ':')) {
+ /* if literal IPv6 address */
+ host = apr_pstrcat(r->pool, "[", host, "]", NULL);
+ }
+ r->filename = apr_pstrcat(r->pool, "proxy:", scheme, "//", host, sport,
+ "/", path, (search) ? "?" : "",
+ (search) ? search : "", NULL);
+ return OK;
+}
+
+/*
+ * process the request and write the response.
+ */
+static int proxy_wstunnel_request(apr_pool_t *p, request_rec *r,
+ proxy_conn_rec *conn,
+ proxy_worker *worker,
+ proxy_server_conf *conf,
+ apr_uri_t *uri,
+ char *url, char *server_portstr)
+{
+ apr_status_t rv;
+ apr_pollset_t *pollset;
+ apr_pollfd_t pollfd;
+ const apr_pollfd_t *signalled;
+ apr_int32_t pollcnt, pi;
+ apr_int16_t pollevent;
+ conn_rec *c = r->connection;
+ apr_socket_t *sock = conn->sock;
+ conn_rec *backconn = conn->connection;
+ char *buf;
+ apr_bucket_brigade *header_brigade;
+ apr_bucket *e;
+ char *old_cl_val = NULL;
+ char *old_te_val = NULL;
+ apr_bucket_brigade *bb = apr_brigade_create(p, c->bucket_alloc);
+ apr_socket_t *client_socket = ap_get_conn_socket(c);
+ int done = 0, replied = 0;
+ const char *upgrade_method = *worker->s->upgrade ? worker->s->upgrade : "WebSocket";
+
+ header_brigade = apr_brigade_create(p, backconn->bucket_alloc);
+
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, "sending request");
+
+ rv = ap_proxy_create_hdrbrgd(p, header_brigade, r, conn,
+ worker, conf, uri, url, server_portstr,
+ &old_cl_val, &old_te_val);
+ if (rv != OK) {
+ return rv;
+ }
+
+ if (ap_cstr_casecmp(upgrade_method, "NONE") == 0) {
+ buf = apr_pstrdup(p, "Upgrade: WebSocket" CRLF "Connection: Upgrade" CRLF CRLF);
+ } else if (ap_cstr_casecmp(upgrade_method, "ANY") == 0) {
+ const char *upgrade;
+ upgrade = apr_table_get(r->headers_in, "Upgrade");
+ buf = apr_pstrcat(p, "Upgrade: ", upgrade, CRLF "Connection: Upgrade" CRLF CRLF, NULL);
+ } else {
+ buf = apr_pstrcat(p, "Upgrade: ", upgrade_method, CRLF "Connection: Upgrade" CRLF CRLF, NULL);
+ }
+ ap_xlate_proto_to_ascii(buf, strlen(buf));
+ e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc);
+ APR_BRIGADE_INSERT_TAIL(header_brigade, e);
+
+ if ((rv = ap_proxy_pass_brigade(backconn->bucket_alloc, r, conn, backconn,
+ header_brigade, 1)) != OK)
+ return rv;
+
+ apr_brigade_cleanup(header_brigade);
+
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, "setting up poll()");
+
+ if ((rv = apr_pollset_create(&pollset, 2, p, 0)) != APR_SUCCESS) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(02443)
+ "error apr_pollset_create()");
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+#if 0
+ apr_socket_opt_set(sock, APR_SO_NONBLOCK, 1);
+ apr_socket_opt_set(sock, APR_SO_KEEPALIVE, 1);
+ apr_socket_opt_set(client_socket, APR_SO_NONBLOCK, 1);
+ apr_socket_opt_set(client_socket, APR_SO_KEEPALIVE, 1);
+#endif
+
+ pollfd.p = p;
+ pollfd.desc_type = APR_POLL_SOCKET;
+ pollfd.reqevents = APR_POLLIN | APR_POLLHUP;
+ pollfd.desc.s = sock;
+ pollfd.client_data = NULL;
+ apr_pollset_add(pollset, &pollfd);
+
+ pollfd.desc.s = client_socket;
+ apr_pollset_add(pollset, &pollfd);
+
+ ap_remove_input_filter_byhandle(c->input_filters, "reqtimeout");
+
+ r->output_filters = c->output_filters;
+ r->proto_output_filters = c->output_filters;
+ r->input_filters = c->input_filters;
+ r->proto_input_filters = c->input_filters;
+
+ /* This handler should take care of the entire connection; make it so that
+ * nothing else is attempted on the connection after returning. */
+ c->keepalive = AP_CONN_CLOSE;
+
+ do { /* Loop until done (one side closes the connection, or an error) */
+ rv = apr_pollset_poll(pollset, -1, &pollcnt, &signalled);
+ if (rv != APR_SUCCESS) {
+ if (APR_STATUS_IS_EINTR(rv)) {
+ continue;
+ }
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(02444) "error apr_poll()");
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(02445)
+ "woke from poll(), i=%d", pollcnt);
+
+ for (pi = 0; pi < pollcnt; pi++) {
+ const apr_pollfd_t *cur = &signalled[pi];
+
+ if (cur->desc.s == sock) {
+ pollevent = cur->rtnevents;
+ if (pollevent & (APR_POLLIN | APR_POLLHUP)) {
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(02446)
+ "sock was readable");
+ done |= ap_proxy_transfer_between_connections(r, backconn,
+ c,
+ header_brigade,
+ bb, "sock",
+ &replied,
+ AP_IOBUFSIZE,
+ 0)
+ != APR_SUCCESS;
+ }
+ else if (pollevent & APR_POLLERR) {
+ ap_log_rerror(APLOG_MARK, APLOG_NOTICE, 0, r, APLOGNO(02447)
+ "error on backconn");
+ backconn->aborted = 1;
+ done = 1;
+ }
+ else {
+ ap_log_rerror(APLOG_MARK, APLOG_NOTICE, 0, r, APLOGNO(02605)
+ "unknown event on backconn %d", pollevent);
+ done = 1;
+ }
+ }
+ else if (cur->desc.s == client_socket) {
+ pollevent = cur->rtnevents;
+ if (pollevent & (APR_POLLIN | APR_POLLHUP)) {
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(02448)
+ "client was readable");
+ done |= ap_proxy_transfer_between_connections(r, c,
+ backconn, bb,
+ header_brigade,
+ "client",
+ NULL,
+ AP_IOBUFSIZE,
+ 0)
+ != APR_SUCCESS;
+ }
+ else if (pollevent & APR_POLLERR) {
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(02607)
+ "error on client conn");
+ c->aborted = 1;
+ done = 1;
+ }
+ else {
+ ap_log_rerror(APLOG_MARK, APLOG_NOTICE, 0, r, APLOGNO(02606)
+ "unknown event on client conn %d", pollevent);
+ done = 1;
+ }
+ }
+ else {
+ ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(02449)
+ "unknown socket in pollset");
+ done = 1;
+ }
+
+ }
+ } while (!done);
+
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r,
+ "finished with poll() - cleaning up");
+
+ if (!replied) {
+ return HTTP_BAD_GATEWAY;
+ }
+ else {
+ return OK;
+ }
+
+ return OK;
+}
+
+/*
+ */
+static int proxy_wstunnel_handler(request_rec *r, proxy_worker *worker,
+ proxy_server_conf *conf,
+ char *url, const char *proxyname,
+ apr_port_t proxyport)
+{
+ proxyws_dir_conf *dconf = ap_get_module_config(r->per_dir_config,
+ &proxy_wstunnel_module);
+ int status;
+ char server_portstr[32];
+ proxy_conn_rec *backend = NULL;
+ const char *upgrade;
+ char *scheme;
+ apr_pool_t *p = r->pool;
+ char *locurl = url;
+ apr_uri_t *uri;
+ int is_ssl = 0;
+
+ if (can_fallback_to_proxy_http && dconf->fallback_to_proxy_http) {
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, r, "handler fallback");
+ return DECLINED;
+ }
+
+ 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;
+ }
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "serving URL %s", url);
+
+ upgrade = apr_table_get(r->headers_in, "Upgrade");
+ if (!upgrade || !ap_proxy_worker_can_upgrade(p, worker, upgrade,
+ "WebSocket")) {
+ const char *worker_upgrade = *worker->s->upgrade ? worker->s->upgrade
+ : "WebSocket";
+ ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(02900)
+ "require upgrade for URL %s "
+ "(Upgrade header is %s, expecting %s)",
+ url, upgrade ? upgrade : "missing", worker_upgrade);
+ apr_table_setn(r->err_headers_out, "Connection", "Upgrade");
+ apr_table_setn(r->err_headers_out, "Upgrade", worker_upgrade);
+ return HTTP_UPGRADE_REQUIRED;
+ }
+
+ 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 */
+ status = ap_proxy_connection_create_ex(scheme, backend, r);
+ if (status != OK) {
+ goto cleanup;
+ }
+
+ /* Step Four: Process the Request */
+ status = proxy_wstunnel_request(p, r, backend, worker, conf, uri, locurl,
+ server_portstr);
+
+cleanup:
+ /* Do not close the socket */
+ if (backend) {
+ 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->fallback_to_proxy_http = 1;
+
+ return (void *) new;
+}
+
+static void *merge_proxyws_dir_config(apr_pool_t *p, void *vbase, void *vadd)
+{
+ proxyws_dir_conf *new = apr_pcalloc(p, sizeof(proxyws_dir_conf)),
+ *add = vadd, *base = vbase;
+
+ new->fallback_to_proxy_http = (add->fallback_to_proxy_http_set)
+ ? add->fallback_to_proxy_http
+ : base->fallback_to_proxy_http;
+ new->fallback_to_proxy_http_set = (add->fallback_to_proxy_http_set
+ || base->fallback_to_proxy_http_set);
+
+ return new;
+}
+
+static const char * proxyws_fallback_to_proxy_http(cmd_parms *cmd, void *conf, int arg)
+{
+ proxyws_dir_conf *dconf = conf;
+ dconf->fallback_to_proxy_http = !!arg;
+ dconf->fallback_to_proxy_http_set = 1;
+ return NULL;
+}
+
+static int proxy_wstunnel_post_config(apr_pool_t *pconf, apr_pool_t *plog,
+ apr_pool_t *ptemp, server_rec *s)
+{
+ can_fallback_to_proxy_http =
+ (ap_find_linked_module("mod_proxy_http.c") != NULL);
+
+ return OK;
+}
+
+static const command_rec ws_proxy_cmds[] =
+{
+ AP_INIT_FLAG("ProxyWebsocketFallbackToProxyHttp",
+ proxyws_fallback_to_proxy_http, NULL, RSRC_CONF|ACCESS_CONF,
+ "whether to let mod_proxy_http handle the upgrade and tunneling, "
+ "On by default"),
+
+ {NULL}
+};
+
+static void ws_proxy_hooks(apr_pool_t *p)
+{
+ static const char * const aszSucc[] = { "mod_proxy_http.c", NULL};
+ ap_hook_post_config(proxy_wstunnel_post_config, NULL, NULL, APR_HOOK_MIDDLE);
+ proxy_hook_scheme_handler(proxy_wstunnel_handler, NULL, aszSucc, APR_HOOK_FIRST);
+ proxy_hook_check_trans(proxy_wstunnel_check_trans, NULL, aszSucc, APR_HOOK_MIDDLE);
+ 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 */
+ merge_proxyws_dir_config, /* merge per-directory config structures */
+ NULL, /* create per-server config structure */
+ NULL, /* merge per-server config structures */
+ ws_proxy_cmds, /* command apr_table_t */
+ ws_proxy_hooks /* register hooks */
+};