Adding upstream version 2.4.38.upstream/2.4.38upstream

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

1 files changed, 241 insertions, 0 deletions

diff --git a/modules/proxy/mod_proxy_fdpass.c b/modules/proxy/mod_proxy_fdpass.c
new file mode 100644
index 0000000..195b0fd
--- /dev/null
+++ b/modules/proxy/mod_proxy_fdpass.c
@@ -0,0 +1,241 @@
+/* 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 <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#ifndef CMSG_DATA
+#error This module only works on unix platforms with the correct OS support
+#endif
+
+#include "mod_proxy_fdpass.h"
+
+module AP_MODULE_DECLARE_DATA proxy_fdpass_module;
+
+static int proxy_fdpass_canon(request_rec *r, char *url)
+{
+    const char *path;
+
+    if (strncasecmp(url, "fd://", 5) == 0) {
+        url += 5;
+    }
+    else {
+        return DECLINED;
+    }
+
+    path = ap_server_root_relative(r->pool, url);
+
+    r->filename = apr_pstrcat(r->pool, "proxy:fd://", path, NULL);
+
+    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01151)
+                  "set r->filename to %s", r->filename);
+    return OK;
+}
+
+static apr_status_t get_socket_from_path(apr_pool_t *p,
+                                         const char* path,
+                                         apr_socket_t **out_sock)
+{
+    apr_socket_t *s;
+    apr_status_t rv;
+    *out_sock = NULL;
+
+    rv = apr_socket_create(&s, AF_UNIX, SOCK_STREAM, 0, p);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    rv = ap_proxy_connect_uds(s, path, p);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    *out_sock = s;
+
+    return APR_SUCCESS;
+}
+
+static apr_status_t send_socket(apr_pool_t *p,
+                                apr_socket_t *s,
+                                apr_socket_t *outbound)
+{
+    apr_status_t rv;
+    apr_os_sock_t rawsock;
+    apr_os_sock_t srawsock;
+    struct msghdr msg;
+    struct cmsghdr *cmsg;
+    struct iovec iov;
+    char b = '\0';
+
+    rv = apr_os_sock_get(&rawsock, outbound);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    rv = apr_os_sock_get(&srawsock, s);
+    if (rv != APR_SUCCESS) {
+        return rv;
+    }
+
+    memset(&msg, 0, sizeof(msg));
+
+    msg.msg_iov = &iov;
+    msg.msg_iovlen = 1;
+
+    iov.iov_base = &b;
+    iov.iov_len = 1;
+
+    cmsg = apr_palloc(p, sizeof(*cmsg) + sizeof(rawsock));
+    cmsg->cmsg_len = sizeof(*cmsg) + sizeof(rawsock);
+    cmsg->cmsg_level = SOL_SOCKET;
+    cmsg->cmsg_type = SCM_RIGHTS;
+
+    memcpy(CMSG_DATA(cmsg), &rawsock, sizeof(rawsock));
+
+    msg.msg_control = cmsg;
+    msg.msg_controllen = cmsg->cmsg_len;
+
+    rv = sendmsg(srawsock, &msg, 0);
+
+    if (rv == -1) {
+        return errno;
+    }
+
+    return APR_SUCCESS;
+}
+
+static int proxy_fdpass_handler(request_rec *r, proxy_worker *worker,
+                              proxy_server_conf *conf,
+                              char *url, const char *proxyname,
+                              apr_port_t proxyport)
+{
+    apr_status_t rv;
+    apr_socket_t *sock;
+    apr_socket_t *clientsock;
+
+    if (strncasecmp(url, "fd://", 5) == 0) {
+        url += 5;
+    }
+    else {
+        return DECLINED;
+    }
+
+    rv = get_socket_from_path(r->pool, url, &sock);
+
+    if (rv != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01152)
+                      "Failed to connect to '%s'", url);
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    {
+        int status;
+        const char *flush_method = *worker->s->flusher ? worker->s->flusher : "flush";
+
+        proxy_fdpass_flush *flush = ap_lookup_provider(PROXY_FDPASS_FLUSHER,
+                                                       flush_method, "0");
+
+        if (!flush) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01153)
+                          "Unable to find configured flush provider '%s'",
+                          flush_method);
+            return HTTP_INTERNAL_SERVER_ERROR;
+        }
+
+        status = flush->flusher(r);
+        if (status) {
+            return status;
+        }
+    }
+
+    clientsock = ap_get_conn_socket(r->connection);
+
+    rv = send_socket(r->pool, sock, clientsock);
+    if (rv != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01154) "send_socket failed:");
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    {
+        apr_socket_t *dummy;
+        /* Create a dummy unconnected socket, and set it as the one we were
+         * connected to, so that when the core closes it, it doesn't close
+         * the tcp connection to the client.
+         */
+        rv = apr_socket_create(&dummy, APR_INET, SOCK_STREAM, APR_PROTO_TCP,
+                               r->connection->pool);
+        if (rv != APR_SUCCESS) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01155)
+                          "failed to create dummy socket");
+            return HTTP_INTERNAL_SERVER_ERROR;
+        }
+        ap_set_core_module_config(r->connection->conn_config, dummy);
+    }
+
+    return OK;
+}
+
+static int standard_flush(request_rec *r)
+{
+    int status;
+    apr_bucket_brigade *bb;
+    apr_bucket *e;
+
+    r->connection->keepalive = AP_CONN_CLOSE;
+
+    bb = apr_brigade_create(r->pool, r->connection->bucket_alloc);
+    e = apr_bucket_flush_create(r->connection->bucket_alloc);
+
+    APR_BRIGADE_INSERT_TAIL(bb, e);
+
+    status = ap_pass_brigade(r->output_filters, bb);
+
+    if (status != OK) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01156)
+                      "ap_pass_brigade failed:");
+        return status;
+    }
+
+    return OK;
+}
+
+
+static const proxy_fdpass_flush builtin_flush =
+{
+    "flush",
+    &standard_flush,
+    NULL
+};
+
+static void register_hooks(apr_pool_t *p)
+{
+    ap_register_provider(p, PROXY_FDPASS_FLUSHER, "flush", "0", &builtin_flush);
+    proxy_hook_scheme_handler(proxy_fdpass_handler, NULL, NULL, APR_HOOK_FIRST);
+    proxy_hook_canon_handler(proxy_fdpass_canon, NULL, NULL, APR_HOOK_FIRST);
+}
+
+AP_DECLARE_MODULE(proxy_fdpass) = {
+    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_hooks              /* register hooks */
+};