Adding upstream version 2.4.58.upstream/2.4.58

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 482 insertions, 0 deletions

diff --git a/modules/http2/mod_proxy_http2.c b/modules/http2/mod_proxy_http2.c
new file mode 100644
index 0000000..ebf8f61
--- /dev/null
+++ b/modules/http2/mod_proxy_http2.c
@@ -0,0 +1,482 @@
+/* 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 <nghttp2/nghttp2.h>
+
+#include <ap_mmn.h>
+#include <httpd.h>
+#include <mod_proxy.h>
+#include "mod_http2.h"
+
+
+#include "mod_proxy_http2.h"
+#include "h2.h"
+#include "h2_proxy_util.h"
+#include "h2_version.h"
+#include "h2_proxy_session.h"
+
+#define H2MIN(x,y) ((x) < (y) ? (x) : (y))
+
+static void register_hook(apr_pool_t *p);
+
+AP_DECLARE_MODULE(proxy_http2) = {
+    STANDARD20_MODULE_STUFF,
+    NULL,              /* create per-directory config structure */
+    NULL,              /* merge per-directory config structures */
+    NULL,              /* create per-server config structure */
+    NULL,              /* merge per-server config structures */
+    NULL,              /* command apr_table_t */
+    register_hook,     /* register hooks */
+#if defined(AP_MODULE_FLAG_NONE)
+    AP_MODULE_FLAG_ALWAYS_MERGE
+#endif
+};
+
+/* Optional functions from mod_http2 */
+static int (*is_h2)(conn_rec *c);
+
+typedef struct h2_proxy_ctx {
+    const char *id;
+    conn_rec *cfront;
+    apr_pool_t *pool;
+    server_rec *server;
+    const char *proxy_func;
+    char server_portstr[32];
+    proxy_conn_rec *p_conn;
+    proxy_worker *worker;
+    proxy_server_conf *conf;
+    
+    apr_size_t req_buffer_size;
+    int capacity;
+    
+    unsigned is_ssl : 1;
+    
+    request_rec *r;            /* the request processed in this ctx */
+    int r_status;              /* status of request work */
+    int r_done;                /* request was processed, not necessarily successfully */
+    int r_may_retry;           /* request may be retried */
+    int has_reusable_session;  /* http2 session is live and clean */
+} h2_proxy_ctx;
+
+static int h2_proxy_post_config(apr_pool_t *p, apr_pool_t *plog,
+                                apr_pool_t *ptemp, server_rec *s)
+{
+    void *data = NULL;
+    const char *init_key = "mod_proxy_http2_init_counter";
+    nghttp2_info *ngh2;
+    apr_status_t status = APR_SUCCESS;
+    (void)plog;(void)ptemp;
+    
+    apr_pool_userdata_get(&data, init_key, s->process->pool);
+    if ( data == NULL ) {
+        apr_pool_userdata_set((const void *)1, init_key,
+                              apr_pool_cleanup_null, s->process->pool);
+        return APR_SUCCESS;
+    }
+    
+    ngh2 = nghttp2_version(0);
+    ap_log_error( APLOG_MARK, APLOG_INFO, 0, s, APLOGNO(03349)
+                 "mod_proxy_http2 (v%s, nghttp2 %s), initializing...",
+                 MOD_HTTP2_VERSION, ngh2? ngh2->version_str : "unknown");
+    
+    is_h2 = APR_RETRIEVE_OPTIONAL_FN(http2_is_h2);
+    
+    return status;
+}
+
+/**
+ * canonicalize the url into the request, if it is meant for us.
+ * slightly modified copy from mod_http
+ */
+static int proxy_http2_canon(request_rec *r, char *url)
+{
+    char *host, *path, sport[7];
+    char *search = NULL;
+    const char *err;
+    const char *scheme;
+    const char *http_scheme;
+    apr_port_t port, def_port;
+
+    /* ap_port_of_scheme() */
+    if (ap_cstr_casecmpn(url, "h2c:", 4) == 0) {
+        url += 4;
+        scheme = "h2c";
+        http_scheme = "http";
+    }
+    else if (ap_cstr_casecmpn(url, "h2:", 3) == 0) {
+        url += 3;
+        scheme = "h2";
+        http_scheme = "https";
+    }
+    else {
+        return DECLINED;
+    }
+    port = def_port = ap_proxy_port_of_scheme(http_scheme);
+
+    ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r,
+                  "HTTP2: canonicalising URL %s", url);
+
+    /* do syntatic 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(03350)
+                      "error parsing URL %s: %s", url, err);
+        return HTTP_BAD_REQUEST;
+    }
+
+    /*
+     * now parse path/search args, according to rfc1738:
+     * process the path.
+     *
+     * In a reverse proxy, our URL has been processed, so canonicalise
+     * unless proxy-nocanon is set to say it's raw
+     * In a forward proxy, we have and MUST NOT MANGLE the original.
+     */
+    switch (r->proxyreq) {
+    default: /* wtf are we doing here? */
+    case PROXYREQ_REVERSE:
+        if (apr_table_get(r->notes, "proxy-nocanon")) {
+            path = url;   /* this is the raw path */
+        }
+        else if (apr_table_get(r->notes, "proxy-noencode")) {
+            path = url;   /* this is the encoded path already */
+            search = r->args;
+        }
+        else {
+#ifdef PROXY_CANONENC_NOENCODEDSLASHENCODING
+            core_dir_config *d = ap_get_core_module_config(r->per_dir_config);
+            int flags = d->allow_encoded_slashes && !d->decode_encoded_slashes ? PROXY_CANONENC_NOENCODEDSLASHENCODING : 0;
+
+            path = ap_proxy_canonenc_ex(r->pool, url, (int)strlen(url),
+                                        enc_path, flags, r->proxyreq);
+#else
+            path = ap_proxy_canonenc(r->pool, url, (int)strlen(url),
+                                     enc_path, 0, r->proxyreq);
+#endif
+            if (!path) {
+                return HTTP_BAD_REQUEST;
+            }
+            search = r->args;
+        }
+        break;
+    case PROXYREQ_PROXY:
+        path = url;
+        break;
+    }
+    /*
+     * If we have a raw control character or a ' ' in nocanon path or
+     * r->args, correct encoding was missed.
+     */
+    if (path == url && *ap_scan_vchar_obstext(path)) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10420)
+                      "To be forwarded path contains control "
+                      "characters or spaces");
+        return HTTP_FORBIDDEN;
+    }
+    if (search && *ap_scan_vchar_obstext(search)) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10412)
+                      "To be forwarded query string contains control "
+                      "characters or spaces");
+        return HTTP_FORBIDDEN;
+    }
+
+    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;
+}
+
+static apr_status_t add_request(h2_proxy_session *session, request_rec *r)
+{
+    h2_proxy_ctx *ctx = session->user_data;
+    const char *url;
+    apr_status_t status;
+
+    url = apr_table_get(r->notes, H2_PROXY_REQ_URL_NOTE);
+    apr_table_setn(r->notes, "proxy-source-port", apr_psprintf(r->pool, "%hu",
+                   ctx->p_conn->connection->local_addr->port));
+    status = h2_proxy_session_submit(session, url, r, 1);
+    if (status != APR_SUCCESS) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, status, r->connection, APLOGNO(03351)
+                      "pass request body failed to %pI (%s) from %s (%s)",
+                      ctx->p_conn->addr, ctx->p_conn->hostname ? 
+                      ctx->p_conn->hostname: "", session->c->client_ip, 
+                      session->c->remote_host ? session->c->remote_host: "");
+    }
+    return status;
+}
+
+static void request_done(h2_proxy_ctx *ctx, request_rec *r,
+                         apr_status_t status, int touched, int error_code)
+{   
+    if (r == ctx->r) {
+        ap_log_cerror(APLOG_MARK, APLOG_TRACE1, status, r->connection, 
+                      "h2_proxy_session(%s): request done, touched=%d, error=%d",
+                      ctx->id, touched, error_code);
+        ctx->r_done = 1;
+        if (touched) ctx->r_may_retry = 0;
+        ctx->r_status = error_code? HTTP_BAD_GATEWAY :
+            ((status == APR_SUCCESS)? OK :
+             ap_map_http_request_error(status, HTTP_SERVICE_UNAVAILABLE));
+    }
+}    
+
+static void session_req_done(h2_proxy_session *session, request_rec *r,
+                             apr_status_t status, int touched, int error_code)
+{
+    request_done(session->user_data, r, status, touched, error_code);
+}
+
+static apr_status_t ctx_run(h2_proxy_ctx *ctx) {
+    apr_status_t status = OK;
+    h2_proxy_session *session;
+    int h2_front;
+    
+    /* Step Four: Send the Request in a new HTTP/2 stream and
+     * loop until we got the response or encounter errors.
+     */
+    ctx->has_reusable_session = 0; /* don't know yet */
+    h2_front = is_h2? is_h2(ctx->cfront) : 0;
+    session = h2_proxy_session_setup(ctx->id, ctx->p_conn, ctx->conf,
+                                     h2_front, 30,
+                                     h2_proxy_log2((int)ctx->req_buffer_size),
+                                     session_req_done);
+    if (!session) {
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctx->cfront,
+                      APLOGNO(03372) "session unavailable");
+        return HTTP_SERVICE_UNAVAILABLE;
+    }
+    
+    ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctx->cfront, APLOGNO(03373)
+                  "eng(%s): run session %s", ctx->id, session->id);
+    session->user_data = ctx;
+    
+    ctx->r_done = 0;
+    add_request(session, ctx->r);
+    
+    while (!ctx->cfront->aborted && !ctx->r_done) {
+    
+        status = h2_proxy_session_process(session);
+        if (status != APR_SUCCESS) {
+            /* Encountered an error during session processing */
+            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, ctx->cfront,
+                          APLOGNO(03375) "eng(%s): end of session %s", 
+                          ctx->id, session->id);
+            /* Any open stream of that session needs to
+             * a) be reopened on the new session iff safe to do so
+             * b) reported as done (failed) otherwise
+             */
+            h2_proxy_session_cleanup(session, session_req_done);
+            goto out;
+        }
+    }
+    
+out:
+    if (ctx->cfront->aborted) {
+        /* master connection gone */
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, ctx->cfront,
+                      APLOGNO(03374) "eng(%s): master connection gone", ctx->id);
+        /* cancel all ongoing requests */
+        h2_proxy_session_cancel_all(session);
+        h2_proxy_session_process(session);
+    }
+    ctx->has_reusable_session = h2_proxy_session_is_reusable(session);
+    session->user_data = NULL;
+    return status;
+}
+
+static int proxy_http2_handler(request_rec *r, 
+                               proxy_worker *worker,
+                               proxy_server_conf *conf,
+                               char *url, 
+                               const char *proxyname,
+                               apr_port_t proxyport)
+{
+    const char *proxy_func;
+    char *locurl = url, *u;
+    apr_size_t slen;
+    int is_ssl = 0;
+    apr_status_t status;
+    h2_proxy_ctx *ctx;
+    apr_uri_t uri;
+    int reconnects = 0;
+    
+    /* find the scheme */
+    if ((url[0] != 'h' && url[0] != 'H') || url[1] != '2') {
+       return DECLINED;
+    }
+    u = strchr(url, ':');
+    if (u == NULL || u[1] != '/' || u[2] != '/' || u[3] == '\0') {
+       return DECLINED;
+    }
+    slen = (u - url);
+    switch(slen) {
+        case 2:
+            proxy_func = "H2";
+            is_ssl = 1;
+            break;
+        case 3:
+            if (url[2] != 'c' && url[2] != 'C') {
+                return DECLINED;
+            }
+            proxy_func = "H2C";
+            break;
+        default:
+            return DECLINED;
+    }
+
+    ctx = apr_pcalloc(r->pool, sizeof(*ctx));
+    ctx->id = apr_psprintf(r->pool, "%ld", (long)r->connection->id);
+    ctx->cfront = r->connection;
+    ctx->pool = r->pool;
+    ctx->server = r->server;
+    ctx->proxy_func = proxy_func;
+    ctx->is_ssl = is_ssl;
+    ctx->worker = worker;
+    ctx->conf = conf;
+    ctx->req_buffer_size = (32*1024);
+    ctx->r = r;
+    ctx->r_status = status = HTTP_SERVICE_UNAVAILABLE;
+    ctx->r_done = 0;
+    ctx->r_may_retry =  1;
+    
+    ap_set_module_config(ctx->cfront->conn_config, &proxy_http2_module, ctx);
+
+    /* scheme says, this is for us. */
+    apr_table_setn(ctx->r->notes, H2_PROXY_REQ_URL_NOTE, url);
+    ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, ctx->r, 
+                  "H2: serving URL %s", url);
+    
+run_connect:    
+    if (ctx->cfront->aborted) goto cleanup;
+
+    /* Get a proxy_conn_rec from the worker, might be a new one, might
+     * be one still open from another request, or it might fail if the
+     * worker is stopped or in error. */
+    if ((status = ap_proxy_acquire_connection(ctx->proxy_func, &ctx->p_conn,
+                                              ctx->worker, ctx->server)) != OK) {
+        goto cleanup;
+    }
+
+    ctx->p_conn->is_ssl = ctx->is_ssl;
+
+    /* Step One: Determine the URL to connect to (might be a proxy),
+     * initialize the backend accordingly and determine the server 
+     * port string we can expect in responses. */
+    if ((status = ap_proxy_determine_connection(ctx->pool, ctx->r, conf, worker, 
+                                                ctx->p_conn, &uri, &locurl, 
+                                                proxyname, proxyport, 
+                                                ctx->server_portstr,
+                                                sizeof(ctx->server_portstr))) != OK) {
+        goto cleanup;
+    }
+    
+    /* Step Two: Make the Connection (or check that an already existing
+     * socket is still usable). On success, we have a socket connected to
+     * backend->hostname. */
+    if (ap_proxy_connect_backend(ctx->proxy_func, ctx->p_conn, ctx->worker, 
+                                 ctx->server)) {
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctx->cfront, APLOGNO(03352)
+                      "H2: failed to make connection to backend: %s",
+                      ctx->p_conn->hostname);
+        goto cleanup;
+    }
+    
+    /* Step Three: Create conn_rec for the socket we have open now. */
+    status = ap_proxy_connection_create_ex(ctx->proxy_func, ctx->p_conn, ctx->r);
+    if (status != OK) {
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, ctx->cfront, APLOGNO(03353)
+                      "setup new connection: is_ssl=%d %s %s %s", 
+                      ctx->p_conn->is_ssl, ctx->p_conn->ssl_hostname, 
+                      locurl, ctx->p_conn->hostname);
+        ctx->r_status = ap_map_http_request_error(status, HTTP_SERVICE_UNAVAILABLE);
+        goto cleanup;
+    }
+    
+    if (!ctx->p_conn->data && ctx->is_ssl) {
+        /* New SSL connection: set a note on the connection about what
+         * protocol we need. */
+        apr_table_setn(ctx->p_conn->connection->notes,
+                       "proxy-request-alpn-protos", "h2");
+    }
+
+    if (ctx->cfront->aborted) goto cleanup;
+    status = ctx_run(ctx);
+
+    if (ctx->r_status != OK && ctx->r_may_retry && !ctx->cfront->aborted) {
+        /* Not successfully processed, but may retry, tear down old conn and start over */
+        if (ctx->p_conn) {
+            ctx->p_conn->close = 1;
+#if AP_MODULE_MAGIC_AT_LEAST(20140207, 2)
+            proxy_run_detach_backend(r, ctx->p_conn);
+#endif
+            ap_proxy_release_connection(ctx->proxy_func, ctx->p_conn, ctx->server);
+            ctx->p_conn = NULL;
+        }
+        ++reconnects;
+        if (reconnects < 2) {
+            goto run_connect;
+        } 
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, ctx->cfront, APLOGNO(10023)
+                      "giving up after %d reconnects, request-done=%d",
+                      reconnects, ctx->r_done);
+    }
+    
+cleanup:
+    if (ctx->p_conn) {
+        if (status != APR_SUCCESS || !ctx->has_reusable_session) {
+            /* close socket when errors happened or session is not "clean",
+             * meaning in a working condition with no open streams */
+            ctx->p_conn->close = 1;
+        }
+#if AP_MODULE_MAGIC_AT_LEAST(20140207, 2)
+        proxy_run_detach_backend(ctx->r, ctx->p_conn);
+#endif
+        ap_proxy_release_connection(ctx->proxy_func, ctx->p_conn, ctx->server);
+        ctx->p_conn = NULL;
+    }
+
+    ap_set_module_config(ctx->cfront->conn_config, &proxy_http2_module, NULL);
+    ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, ctx->cfront,
+                  APLOGNO(03377) "leaving handler");
+    if (ctx->r_status != OK) {
+        ap_die(ctx->r_status, r);
+    }
+    else if (status != APR_SUCCESS) {
+        ap_die(ap_map_http_request_error(status, HTTP_SERVICE_UNAVAILABLE), r);
+    }
+    return ctx->r_status;
+}
+
+static void register_hook(apr_pool_t *p)
+{
+    ap_hook_post_config(h2_proxy_post_config, NULL, NULL, APR_HOOK_MIDDLE);
+
+    proxy_hook_scheme_handler(proxy_http2_handler, NULL, NULL, APR_HOOK_FIRST);
+    proxy_hook_canon_handler(proxy_http2_canon, NULL, NULL, APR_HOOK_FIRST);
+}
+