httpd/httpd-2.4.41-r1828172+.patch

# ./pullrev.sh 1828172 1862968 1863191 1867878 1867882 1867968 1867970 1867971
http://svn.apache.org/viewvc?view=revision&revision=1828172
http://svn.apache.org/viewvc?view=revision&revision=1862968
http://svn.apache.org/viewvc?view=revision&revision=1863191
http://svn.apache.org/viewvc?view=revision&revision=1867878
http://svn.apache.org/viewvc?view=revision&revision=1867882
http://svn.apache.org/viewvc?view=revision&revision=1867968
http://svn.apache.org/viewvc?view=revision&revision=1867970
http://svn.apache.org/viewvc?view=revision&revision=1867971

--- httpd-2.4.41/modules/generators/mod_cgi.c
+++ httpd-2.4.41/modules/generators/mod_cgi.c
@@ -92,6 +92,10 @@
     apr_size_t  bufbytes;
 } cgi_server_conf;
 
+typedef struct {
+    apr_interval_time_t timeout;
+} cgi_dirconf;
+
 static void *create_cgi_config(apr_pool_t *p, server_rec *s)
 {
     cgi_server_conf *c =
@@ -112,6 +116,12 @@
     return overrides->logname ? overrides : base;
 }
 
+static void *create_cgi_dirconf(apr_pool_t *p, char *dummy)
+{
+    cgi_dirconf *c = (cgi_dirconf *) apr_pcalloc(p, sizeof(cgi_dirconf));
+    return c;
+}
+
 static const char *set_scriptlog(cmd_parms *cmd, void *dummy, const char *arg)
 {
     server_rec *s = cmd->server;
@@ -150,6 +160,17 @@
     return NULL;
 }
 
+static const char *set_script_timeout(cmd_parms *cmd, void *dummy, const char *arg)
+{
+    cgi_dirconf *dc = dummy;
+
+    if (ap_timeout_parameter_parse(arg, &dc->timeout, "s") != APR_SUCCESS) {
+        return "CGIScriptTimeout has wrong format";
+    }
+
+    return NULL;
+}
+
 static const command_rec cgi_cmds[] =
 {
 AP_INIT_TAKE1("ScriptLog", set_scriptlog, NULL, RSRC_CONF,
@@ -158,6 +179,9 @@
      "the maximum length (in bytes) of the script debug log"),
 AP_INIT_TAKE1("ScriptLogBuffer", set_scriptlog_buffer, NULL, RSRC_CONF,
      "the maximum size (in bytes) to record of a POST request"),
+AP_INIT_TAKE1("CGIScriptTimeout", set_script_timeout, NULL, RSRC_CONF | ACCESS_CONF,
+     "The amount of time to wait between successful reads from "
+     "the CGI script, in seconds."),
     {NULL}
 };
 
@@ -471,23 +495,26 @@
                           apr_filepath_name_get(r->filename));
         }
         else {
+            cgi_dirconf *dc = ap_get_module_config(r->per_dir_config, &cgi_module);
+            apr_interval_time_t timeout = dc->timeout > 0 ? dc->timeout : r->server->timeout;
+
             apr_pool_note_subprocess(p, procnew, APR_KILL_AFTER_TIMEOUT);
 
             *script_in = procnew->out;
             if (!*script_in)
                 return APR_EBADF;
-            apr_file_pipe_timeout_set(*script_in, r->server->timeout);
+            apr_file_pipe_timeout_set(*script_in, timeout);
 
             if (e_info->prog_type == RUN_AS_CGI) {
                 *script_out = procnew->in;
                 if (!*script_out)
                     return APR_EBADF;
-                apr_file_pipe_timeout_set(*script_out, r->server->timeout);
+                apr_file_pipe_timeout_set(*script_out, timeout);
 
                 *script_err = procnew->err;
                 if (!*script_err)
                     return APR_EBADF;
-                apr_file_pipe_timeout_set(*script_err, r->server->timeout);
+                apr_file_pipe_timeout_set(*script_err, timeout);
             }
         }
     }
@@ -541,212 +568,10 @@
     return APR_SUCCESS;
 }
 
-static void discard_script_output(apr_bucket_brigade *bb)
-{
-    apr_bucket *e;
-    const char *buf;
-    apr_size_t len;
-    apr_status_t rv;
-
-    for (e = APR_BRIGADE_FIRST(bb);
-         e != APR_BRIGADE_SENTINEL(bb);
-         e = APR_BUCKET_NEXT(e))
-    {
-        if (APR_BUCKET_IS_EOS(e)) {
-            break;
-        }
-        rv = apr_bucket_read(e, &buf, &len, APR_BLOCK_READ);
-        if (rv != APR_SUCCESS) {
-            break;
-        }
-    }
-}
-
 #if APR_FILES_AS_SOCKETS
-
-/* A CGI bucket type is needed to catch any output to stderr from the
- * script; see PR 22030. */
-static const apr_bucket_type_t bucket_type_cgi;
-
-struct cgi_bucket_data {
-    apr_pollset_t *pollset;
-    request_rec *r;
-};
-
-/* Create a CGI bucket using pipes from script stdout 'out'
- * and stderr 'err', for request 'r'. */
-static apr_bucket *cgi_bucket_create(request_rec *r,
-                                     apr_file_t *out, apr_file_t *err,
-                                     apr_bucket_alloc_t *list)
-{
-    apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);
-    apr_status_t rv;
-    apr_pollfd_t fd;
-    struct cgi_bucket_data *data = apr_palloc(r->pool, sizeof *data);
-
-    APR_BUCKET_INIT(b);
-    b->free = apr_bucket_free;
-    b->list = list;
-    b->type = &bucket_type_cgi;
-    b->length = (apr_size_t)(-1);
-    b->start = -1;
-
-    /* Create the pollset */
-    rv = apr_pollset_create(&data->pollset, 2, r->pool, 0);
-    if (rv != APR_SUCCESS) {
-        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01217)
-                     "apr_pollset_create(); check system or user limits");
-        return NULL;
-    }
-
-    fd.desc_type = APR_POLL_FILE;
-    fd.reqevents = APR_POLLIN;
-    fd.p = r->pool;
-    fd.desc.f = out; /* script's stdout */
-    fd.client_data = (void *)1;
-    rv = apr_pollset_add(data->pollset, &fd);
-    if (rv != APR_SUCCESS) {
-        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01218)
-                     "apr_pollset_add(); check system or user limits");
-        return NULL;
-    }
-
-    fd.desc.f = err; /* script's stderr */
-    fd.client_data = (void *)2;
-    rv = apr_pollset_add(data->pollset, &fd);
-    if (rv != APR_SUCCESS) {
-        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01219)
-                     "apr_pollset_add(); check system or user limits");
-        return NULL;
-    }
-
-    data->r = r;
-    b->data = data;
-    return b;
-}
-
-/* Create a duplicate CGI bucket using given bucket data */
-static apr_bucket *cgi_bucket_dup(struct cgi_bucket_data *data,
-                                  apr_bucket_alloc_t *list)
-{
-    apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);
-    APR_BUCKET_INIT(b);
-    b->free = apr_bucket_free;
-    b->list = list;
-    b->type = &bucket_type_cgi;
-    b->length = (apr_size_t)(-1);
-    b->start = -1;
-    b->data = data;
-    return b;
-}
-
-/* Handle stdout from CGI child.  Duplicate of logic from the _read
- * method of the real APR pipe bucket implementation. */
-static apr_status_t cgi_read_stdout(apr_bucket *a, apr_file_t *out,
-                                    const char **str, apr_size_t *len)
-{
-    char *buf;
-    apr_status_t rv;
-
-    *str = NULL;
-    *len = APR_BUCKET_BUFF_SIZE;
-    buf = apr_bucket_alloc(*len, a->list); /* XXX: check for failure? */
-
-    rv = apr_file_read(out, buf, len);
-
-    if (rv != APR_SUCCESS && rv != APR_EOF) {
-        apr_bucket_free(buf);
-        return rv;
-    }
-
-    if (*len > 0) {
-        struct cgi_bucket_data *data = a->data;
-        apr_bucket_heap *h;
-
-        /* Change the current bucket to refer to what we read */
-        a = apr_bucket_heap_make(a, buf, *len, apr_bucket_free);
-        h = a->data;
-        h->alloc_len = APR_BUCKET_BUFF_SIZE; /* note the real buffer size */
-        *str = buf;
-        APR_BUCKET_INSERT_AFTER(a, cgi_bucket_dup(data, a->list));
-    }
-    else {
-        apr_bucket_free(buf);
-        a = apr_bucket_immortal_make(a, "", 0);
-        *str = a->data;
-    }
-    return rv;
-}
-
-/* Read method of CGI bucket: polls on stderr and stdout of the child,
- * sending any stderr output immediately away to the error log. */
-static apr_status_t cgi_bucket_read(apr_bucket *b, const char **str,
-                                    apr_size_t *len, apr_read_type_e block)
-{
-    struct cgi_bucket_data *data = b->data;
-    apr_interval_time_t timeout;
-    apr_status_t rv;
-    int gotdata = 0;
-
-    timeout = block == APR_NONBLOCK_READ ? 0 : data->r->server->timeout;
-
-    do {
-        const apr_pollfd_t *results;
-        apr_int32_t num;
-
-        rv = apr_pollset_poll(data->pollset, timeout, &num, &results);
-        if (APR_STATUS_IS_TIMEUP(rv)) {
-            if (timeout) {
-                ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, data->r, APLOGNO(01220)
-                              "Timeout waiting for output from CGI script %s",
-                              data->r->filename);
-                return rv;
-            }
-            else {
-                return APR_EAGAIN;
-            }
-        }
-        else if (APR_STATUS_IS_EINTR(rv)) {
-            continue;
-        }
-        else if (rv != APR_SUCCESS) {
-            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, data->r, APLOGNO(01221)
-                          "poll failed waiting for CGI child");
-            return rv;
-        }
-
-        for (; num; num--, results++) {
-            if (results[0].client_data == (void *)1) {
-                /* stdout */
-                rv = cgi_read_stdout(b, results[0].desc.f, str, len);
-                if (APR_STATUS_IS_EOF(rv)) {
-                    rv = APR_SUCCESS;
-                }
-                gotdata = 1;
-            } else {
-                /* stderr */
-                apr_status_t rv2 = log_script_err(data->r, results[0].desc.f);
-                if (APR_STATUS_IS_EOF(rv2)) {
-                    apr_pollset_remove(data->pollset, &results[0]);
-                }
-            }
-        }
-
-    } while (!gotdata);
-
-    return rv;
-}
-
-static const apr_bucket_type_t bucket_type_cgi = {
-    "CGI", 5, APR_BUCKET_DATA,
-    apr_bucket_destroy_noop,
-    cgi_bucket_read,
-    apr_bucket_setaside_notimpl,
-    apr_bucket_split_notimpl,
-    apr_bucket_copy_notimpl
-};
-
+#define WANT_CGI_BUCKET
 #endif
+#include "cgi_common.h"
 
 static int cgi_handler(request_rec *r)
 {
@@ -766,6 +591,8 @@
     apr_status_t rv;
     cgi_exec_info_t e_info;
     conn_rec *c;
+    cgi_dirconf *dc = ap_get_module_config(r->per_dir_config, &cgi_module);
+    apr_interval_time_t timeout = dc->timeout > 0 ? dc->timeout : r->server->timeout;
 
     if (strcmp(r->handler, CGI_MAGIC_TYPE) && strcmp(r->handler, "cgi-script")) {
         return DECLINED;
@@ -925,10 +752,7 @@
     AP_DEBUG_ASSERT(script_in != NULL);
 
 #if APR_FILES_AS_SOCKETS
-    apr_file_pipe_timeout_set(script_in, 0);
-    apr_file_pipe_timeout_set(script_err, 0);
-
-    b = cgi_bucket_create(r, script_in, script_err, c->bucket_alloc);
+    b = cgi_bucket_create(r, dc->timeout, script_in, script_err, c->bucket_alloc);
     if (b == NULL)
         return HTTP_INTERNAL_SERVER_ERROR;
 #else
@@ -938,111 +762,7 @@
     b = apr_bucket_eos_create(c->bucket_alloc);
     APR_BRIGADE_INSERT_TAIL(bb, b);
 
-    /* Handle script return... */
-    if (!nph) {
-        const char *location;
-        char sbuf[MAX_STRING_LEN];
-        int ret;
-
-        if ((ret = ap_scan_script_header_err_brigade_ex(r, bb, sbuf,
-                                                        APLOG_MODULE_INDEX)))
-        {
-            ret = log_script(r, conf, ret, dbuf, sbuf, bb, script_err);
-
-            /*
-             * ret could be HTTP_NOT_MODIFIED in the case that the CGI script
-             * does not set an explicit status and ap_meets_conditions, which
-             * is called by ap_scan_script_header_err_brigade, detects that
-             * the conditions of the requests are met and the response is
-             * not modified.
-             * In this case set r->status and return OK in order to prevent
-             * running through the error processing stack as this would
-             * break with mod_cache, if the conditions had been set by
-             * mod_cache itself to validate a stale entity.
-             * BTW: We circumvent the error processing stack anyway if the
-             * CGI script set an explicit status code (whatever it is) and
-             * the only possible values for ret here are:
-             *
-             * HTTP_NOT_MODIFIED          (set by ap_meets_conditions)
-             * HTTP_PRECONDITION_FAILED   (set by ap_meets_conditions)
-             * HTTP_INTERNAL_SERVER_ERROR (if something went wrong during the
-             * processing of the response of the CGI script, e.g broken headers
-             * or a crashed CGI process).
-             */
-            if (ret == HTTP_NOT_MODIFIED) {
-                r->status = ret;
-                return OK;
-            }
-
-            return ret;
-        }
-
-        location = apr_table_get(r->headers_out, "Location");
-
-        if (location && r->status == 200) {
-            /* For a redirect whether internal or not, discard any
-             * remaining stdout from the script, and log any remaining
-             * stderr output, as normal. */
-            discard_script_output(bb);
-            apr_brigade_destroy(bb);
-            apr_file_pipe_timeout_set(script_err, r->server->timeout);
-            log_script_err(r, script_err);
-        }
-
-        if (location && location[0] == '/' && r->status == 200) {
-            /* This redirect needs to be a GET no matter what the original
-             * method was.
-             */
-            r->method = "GET";
-            r->method_number = M_GET;
-
-            /* We already read the message body (if any), so don't allow
-             * the redirected request to think it has one.  We can ignore
-             * Transfer-Encoding, since we used REQUEST_CHUNKED_ERROR.
-             */
-            apr_table_unset(r->headers_in, "Content-Length");
-
-            ap_internal_redirect_handler(location, r);
-            return OK;
-        }
-        else if (location && r->status == 200) {
-            /* XXX: Note that if a script wants to produce its own Redirect
-             * body, it now has to explicitly *say* "Status: 302"
-             */
-            return HTTP_MOVED_TEMPORARILY;
-        }
-
-        rv = ap_pass_brigade(r->output_filters, bb);
-    }
-    else /* nph */ {
-        struct ap_filter_t *cur;
-
-        /* get rid of all filters up through protocol...  since we
-         * haven't parsed off the headers, there is no way they can
-         * work
-         */
-
-        cur = r->proto_output_filters;
-        while (cur && cur->frec->ftype < AP_FTYPE_CONNECTION) {
-            cur = cur->next;
-        }
-        r->output_filters = r->proto_output_filters = cur;
-
-        rv = ap_pass_brigade(r->output_filters, bb);
-    }
-
-    /* don't soak up script output if errors occurred writing it
-     * out...  otherwise, we prolong the life of the script when the
-     * connection drops or we stopped sending output for some other
-     * reason */
-    if (rv == APR_SUCCESS && !r->connection->aborted) {
-        apr_file_pipe_timeout_set(script_err, r->server->timeout);
-        log_script_err(r, script_err);
-    }
-
-    apr_file_close(script_err);
-
-    return OK;                      /* NOT r->status, even if it has changed. */
+    return cgi_handle_response(r, nph, bb, timeout, conf, dbuf, script_err);
 }
 
 /*============================================================================
@@ -1277,7 +997,7 @@
 AP_DECLARE_MODULE(cgi) =
 {
     STANDARD20_MODULE_STUFF,
-    NULL,                        /* dir config creater */
+    create_cgi_dirconf,          /* dir config creater */
     NULL,                        /* dir merger --- default is to override */
     create_cgi_config,           /* server config */
     merge_cgi_config,            /* merge server config */
--- httpd-2.4.41/modules/generators/config5.m4
+++ httpd-2.4.41/modules/generators/config5.m4
@@ -78,4 +78,15 @@
 
 APR_ADDTO(INCLUDES, [-I\$(top_srcdir)/$modpath_current])
 
+AC_ARG_ENABLE(cgid-fdpassing,
+  [APACHE_HELP_STRING(--enable-cgid-fdpassing,Enable experimental mod_cgid support for fd passing)],
+  [if test "$enableval" = "yes"; then
+     AC_CHECK_DECL(CMSG_DATA,
+       [AC_DEFINE([HAVE_CGID_FDPASSING], 1, [Enable FD passing support in mod_cgid])],
+       [AC_MSG_ERROR([cannot support mod_cgid fd-passing on this system])], [
+#include <sys/types.h>
+#include <sys/socket.h>])
+  fi
+])
+
 APACHE_MODPATH_FINISH
--- httpd-2.4.41/modules/generators/mod_cgid.c
+++ httpd-2.4.41/modules/generators/mod_cgid.c
@@ -342,15 +342,19 @@
     return close(fd);
 }
 
-/* deal with incomplete reads and signals
- * assume you really have to read buf_size bytes
- */
-static apr_status_t sock_read(int fd, void *vbuf, size_t buf_size)
+/* Read from the socket dealing with incomplete messages and signals.
+ * Returns 0 on success or errno on failure.  Stderr fd passed as
+ * auxiliary data from other end is written to *errfd, or else stderr
+ * fileno if not present. */
+static apr_status_t sock_readhdr(int fd, int *errfd, void *vbuf, size_t buf_size)
 {
-    char *buf = vbuf;
     int rc;
+#ifndef HAVE_CGID_FDPASSING
+    char *buf = vbuf;
     size_t bytes_read = 0;
 
+    if (errfd) *errfd = 0;
+    
     do {
         do {
             rc = read(fd, buf + bytes_read, buf_size - bytes_read);
@@ -365,9 +369,60 @@
         }
     } while (bytes_read < buf_size);
 
+   
+#else /* with FD passing */
+    struct msghdr msg = {0};
+    struct iovec vec = {vbuf, buf_size};
+    struct cmsghdr *cmsg;
+    union {  /* union to ensure alignment */
+        struct cmsghdr cm;
+        char buf[CMSG_SPACE(sizeof(int))];
+    } u;
+    
+    msg.msg_iov = &vec;
+    msg.msg_iovlen = 1;
+
+    if (errfd) {
+        msg.msg_control = u.buf;
+        msg.msg_controllen = sizeof(u.buf);
+        *errfd = 0;
+    }
+    
+    /* use MSG_WAITALL to skip loop on truncated reads */
+    do {
+        rc = recvmsg(fd, &msg, MSG_WAITALL);
+    } while (rc < 0 && errno == EINTR);
+
+    if (rc == 0) {
+        return ECONNRESET;
+    }
+    else if (rc < 0) {
+        return errno;
+    }
+    else if (rc != buf_size) {
+        /* MSG_WAITALL should ensure the recvmsg blocks until the
+         * entire length is read, but let's be paranoid. */
+        return APR_INCOMPLETE;
+    }
+
+    if (errfd
+        && (cmsg = CMSG_FIRSTHDR(&msg)) != NULL
+        && cmsg->cmsg_len == CMSG_LEN(sizeof(*errfd))
+        && cmsg->cmsg_level == SOL_SOCKET
+        && cmsg->cmsg_type == SCM_RIGHTS) {
+        *errfd = *((int *) CMSG_DATA(cmsg));
+    }
+#endif
+    
     return APR_SUCCESS;
 }
 
+/* As sock_readhdr but without auxiliary fd passing. */
+static apr_status_t sock_read(int fd, void *vbuf, size_t buf_size)
+{
+    return sock_readhdr(fd, NULL, vbuf, buf_size);
+}
+
 /* deal with signals
  */
 static apr_status_t sock_write(int fd, const void *buf, size_t buf_size)
@@ -384,7 +439,7 @@
     return APR_SUCCESS;
 }
 
-static apr_status_t sock_writev(int fd, request_rec *r, int count, ...)
+static apr_status_t sock_writev(int fd, int auxfd, request_rec *r, int count, ...)
 {
     va_list ap;
     int rc;
@@ -399,9 +454,39 @@
     }
     va_end(ap);
 
+#ifndef HAVE_CGID_FDPASSING
     do {
         rc = writev(fd, vec, count);
     } while (rc < 0 && errno == EINTR);
+#else
+    {
+        struct msghdr msg = { 0 };
+        struct cmsghdr *cmsg;
+        union { /* union for alignment */
+            char buf[CMSG_SPACE(sizeof(int))];
+            struct cmsghdr align;
+        } u;
+
+        msg.msg_iov = vec;
+        msg.msg_iovlen = count;
+
+        if (auxfd) {
+            msg.msg_control = u.buf;
+            msg.msg_controllen = sizeof(u.buf);
+
+            cmsg = CMSG_FIRSTHDR(&msg);
+            cmsg->cmsg_level = SOL_SOCKET;
+            cmsg->cmsg_type = SCM_RIGHTS;
+            cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+            *((int *) CMSG_DATA(cmsg)) = auxfd;
+        }
+
+        do {
+            rc = sendmsg(fd, &msg, 0);
+        } while (rc < 0 && errno == EINTR);
+    }
+#endif
+    
     if (rc < 0) {
         return errno;
     }
@@ -410,7 +495,7 @@
 }
 
 static apr_status_t get_req(int fd, request_rec *r, char **argv0, char ***env,
-                            cgid_req_t *req)
+                            int *errfd, cgid_req_t *req)
 {
     int i;
     char **environ;
@@ -421,7 +506,7 @@
     r->server = apr_pcalloc(r->pool, sizeof(server_rec));
 
     /* read the request header */
-    stat = sock_read(fd, req, sizeof(*req));
+    stat = sock_readhdr(fd, errfd, req, sizeof(*req));
     if (stat != APR_SUCCESS) {
         return stat;
     }
@@ -479,14 +564,15 @@
     return APR_SUCCESS;
 }
 
-static apr_status_t send_req(int fd, request_rec *r, char *argv0, char **env,
-                             int req_type)
+static apr_status_t send_req(int fd, apr_file_t *errpipe, request_rec *r,
+                             char *argv0, char **env, int req_type)
 {
     int i;
     cgid_req_t req = {0};
     apr_status_t stat;
     ap_unix_identity_t * ugid = ap_run_get_suexec_identity(r);
     core_dir_config *core_conf = ap_get_core_module_config(r->per_dir_config);
+    int errfd;
 
 
     if (ugid == NULL) {
@@ -507,16 +593,21 @@
     req.args_len = r->args ? strlen(r->args) : 0;
     req.loglevel = r->server->log.level;
 
+    if (errpipe)
+        apr_os_file_get(&errfd, errpipe);
+    else
+        errfd = 0;
+    
     /* Write the request header */
     if (req.args_len) {
-        stat = sock_writev(fd, r, 5,
+        stat = sock_writev(fd, errfd, r, 5,
                            &req, sizeof(req),
                            r->filename, req.filename_len,
                            argv0, req.argv0_len,
                            r->uri, req.uri_len,
                            r->args, req.args_len);
     } else {
-        stat = sock_writev(fd, r, 4,
+        stat = sock_writev(fd, errfd, r, 4,
                            &req, sizeof(req),
                            r->filename, req.filename_len,
                            argv0, req.argv0_len,
@@ -531,7 +622,7 @@
     for (i = 0; i < req.env_count; i++) {
         apr_size_t curlen = strlen(env[i]);
 
-        if ((stat = sock_writev(fd, r, 2, &curlen, sizeof(curlen),
+        if ((stat = sock_writev(fd, 0, r, 2, &curlen, sizeof(curlen),
                                 env[i], curlen)) != APR_SUCCESS) {
             return stat;
         }
@@ -582,20 +673,34 @@
     }
 }
 
+/* Callback executed in the forked child process if exec of the CGI
+ * script fails.  For the fd-passing case, output to stderr goes to
+ * the client (request handling thread) and is logged via
+ * ap_log_rerror there.  For the non-fd-passing case, the "fake"
+ * request_rec passed via userdata is used to log. */
 static void cgid_child_errfn(apr_pool_t *pool, apr_status_t err,
                              const char *description)
 {
-    request_rec *r;
     void *vr;
 
     apr_pool_userdata_get(&vr, ERRFN_USERDATA_KEY, pool);
-    r = vr;
-
-    /* sure we got r, but don't call ap_log_rerror() because we don't
-     * have r->headers_in and possibly other storage referenced by
-     * ap_log_rerror()
-     */
-    ap_log_error(APLOG_MARK, APLOG_ERR, err, r->server, APLOGNO(01241) "%s", description);
+    if (vr) {
+        request_rec *r = vr;
+        
+        /* sure we got r, but don't call ap_log_rerror() because we don't
+         * have r->headers_in and possibly other storage referenced by
+         * ap_log_rerror()
+         */
+        ap_log_error(APLOG_MARK, APLOG_ERR, err, r->server, APLOGNO(01241) "%s", description);
+    }
+    else {
+        const char *logstr;
+        
+        logstr = apr_psprintf(pool, APLOGNO(01241) "error spawning CGI child: %s (%pm)\n",
+                              description, &err);
+        fputs(logstr, stderr);
+        fflush(stderr);
+    }
 }
 
 static int cgid_server(void *data)
@@ -669,7 +774,7 @@
     }
 
     while (!daemon_should_exit) {
-        int errfileno = STDERR_FILENO;
+        int errfileno;
         char *argv0 = NULL;
         char **env = NULL;
         const char * const *argv;
@@ -709,7 +814,7 @@
         r = apr_pcalloc(ptrans, sizeof(request_rec));
         procnew = apr_pcalloc(ptrans, sizeof(*procnew));
         r->pool = ptrans;
-        stat = get_req(sd2, r, &argv0, &env, &cgid_req);
+        stat = get_req(sd2, r, &argv0, &env, &errfileno, &cgid_req);
         if (stat != APR_SUCCESS) {
             ap_log_error(APLOG_MARK, APLOG_ERR, stat,
                          main_server, APLOGNO(01248)
@@ -741,6 +846,16 @@
             continue;
         }
 
+        if (errfileno == 0) {
+            errfileno = STDERR_FILENO;
+        }
+        else {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, main_server,
+                          "using passed fd %d as stderr", errfileno);
+            /* Limit the received fd lifetime to pool lifetime */
+            apr_pool_cleanup_register(ptrans, (void *)((long)errfileno),
+                                      close_unix_socket, close_unix_socket);
+        }
         apr_os_file_put(&r->server->error_log, &errfileno, 0, r->pool);
         apr_os_file_put(&inout, &sd2, 0, r->pool);
 
@@ -800,7 +915,10 @@
             close(sd2);
         }
         else {
-            apr_pool_userdata_set(r, ERRFN_USERDATA_KEY, apr_pool_cleanup_null, ptrans);
+            if (errfileno == STDERR_FILENO) {
+                /* Used by cgid_child_errfn without fd-passing. */
+                apr_pool_userdata_set(r, ERRFN_USERDATA_KEY, apr_pool_cleanup_null, ptrans);
+            }
 
             argv = (const char * const *)create_argv(r->pool, NULL, NULL, NULL, argv0, r->args);
 
@@ -1099,6 +1217,33 @@
     return ret;
 }
 
+/* Soak up stderr from a script and redirect it to the error log.
+ * TODO: log_scripterror() and this could move to cgi_common.h. */
+static apr_status_t log_script_err(request_rec *r, apr_file_t *script_err)
+{
+    char argsbuffer[HUGE_STRING_LEN];
+    char *newline;
+    apr_status_t rv;
+    cgid_server_conf *conf = ap_get_module_config(r->server->module_config, &cgid_module);
+
+    while ((rv = apr_file_gets(argsbuffer, HUGE_STRING_LEN,
+                               script_err)) == APR_SUCCESS) {
+
+        newline = strchr(argsbuffer, '\n');
+        if (newline) {
+            char *prev = newline - 1;
+            if (prev >= argsbuffer && *prev == '\r') {
+                newline = prev;
+            }
+
+            *newline = '\0';
+        }
+        log_scripterror(r, conf, r->status, 0, argsbuffer);
+    }
+
+    return rv;
+}
+
 static int log_script(request_rec *r, cgid_server_conf * conf, int ret,
                       char *dbuf, const char *sbuf, apr_bucket_brigade *bb,
                       apr_file_t *script_err)
@@ -1204,6 +1349,13 @@
     return ret;
 }
 
+/* Pull in CGI bucket implementation. */
+#define cgi_server_conf cgid_server_conf
+#ifdef HAVE_CGID_FDPASSING
+#define WANT_CGI_BUCKET
+#endif
+#include "cgi_common.h"
+
 static int connect_to_daemon(int *sdptr, request_rec *r,
                              cgid_server_conf *conf)
 {
@@ -1270,27 +1422,6 @@
     return OK;
 }
 
-static void discard_script_output(apr_bucket_brigade *bb)
-{
-    apr_bucket *e;
-    const char *buf;
-    apr_size_t len;
-    apr_status_t rv;
-
-    for (e = APR_BRIGADE_FIRST(bb);
-         e != APR_BRIGADE_SENTINEL(bb);
-         e = APR_BUCKET_NEXT(e))
-    {
-        if (APR_BUCKET_IS_EOS(e)) {
-            break;
-        }
-        rv = apr_bucket_read(e, &buf, &len, APR_BLOCK_READ);
-        if (rv != APR_SUCCESS) {
-            break;
-        }
-    }
-}
-
 /****************************************************************
  *
  * Actual cgid handling...
@@ -1395,6 +1526,7 @@
 
 static int cgid_handler(request_rec *r)
 {
+    conn_rec *c = r->connection;
     int retval, nph, dbpos;
     char *argv0, *dbuf;
     apr_bucket_brigade *bb;
@@ -1404,10 +1536,11 @@
     int seen_eos, child_stopped_reading;
     int sd;
     char **env;
-    apr_file_t *tempsock;
+    apr_file_t *tempsock, *script_err, *errpipe_out;
     struct cleanup_script_info *info;
     apr_status_t rv;
     cgid_dirconf *dc;
+    apr_interval_time_t timeout;
 
     if (strcmp(r->handler, CGI_MAGIC_TYPE) && strcmp(r->handler, "cgi-script")) {
         return DECLINED;
@@ -1416,7 +1549,7 @@
     conf = ap_get_module_config(r->server->module_config, &cgid_module);
     dc = ap_get_module_config(r->per_dir_config, &cgid_module);
 
-    
+    timeout = dc->timeout > 0 ? dc->timeout : r->server->timeout;
     is_included = !strcmp(r->protocol, "INCLUDED");
 
     if ((argv0 = strrchr(r->filename, '/')) != NULL) {
@@ -1469,6 +1602,17 @@
     }
     */
 
+#ifdef HAVE_CGID_FDPASSING
+    rv = apr_file_pipe_create(&script_err, &errpipe_out, r->pool);
+    if (rv) {
+        return log_scripterror(r, conf, HTTP_SERVICE_UNAVAILABLE, rv, APLOGNO(10176)
+                               "could not create pipe for stderr");
+    }
+#else
+    script_err = NULL;
+    errpipe_out = NULL;
+#endif
+    
     /*
      * httpd core function used to add common environment variables like
      * DOCUMENT_ROOT. 
@@ -1481,12 +1625,16 @@
         return retval;
     }
 
-    rv = send_req(sd, r, argv0, env, CGI_REQ);
+    rv = send_req(sd, errpipe_out, r, argv0, env, CGI_REQ);
     if (rv != APR_SUCCESS) {
         ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01268)
                      "write to cgi daemon process");
     }
 
+    /* The write-end of the pipe is only used by the server, so close
+     * it here. */
+    if (errpipe_out) apr_file_close(errpipe_out);
+    
     info = apr_palloc(r->pool, sizeof(struct cleanup_script_info));
     info->conf = conf;
     info->r = r;
@@ -1508,12 +1656,7 @@
      */
 
     apr_os_pipe_put_ex(&tempsock, &sd, 1, r->pool);
-    if (dc->timeout > 0) { 
-        apr_file_pipe_timeout_set(tempsock, dc->timeout);
-    }
-    else { 
-        apr_file_pipe_timeout_set(tempsock, r->server->timeout);
-    }
+    apr_file_pipe_timeout_set(tempsock, timeout);
     apr_pool_cleanup_kill(r->pool, (void *)((long)sd), close_unix_socket);
 
     /* Transfer any put/post args, CERN style...
@@ -1605,114 +1748,19 @@
      */
     shutdown(sd, 1);
 
-    /* Handle script return... */
-    if (!nph) {
-        conn_rec *c = r->connection;
-        const char *location;
-        char sbuf[MAX_STRING_LEN];
-        int ret;
-
-        bb = apr_brigade_create(r->pool, c->bucket_alloc);
-        b = apr_bucket_pipe_create(tempsock, c->bucket_alloc);
-        APR_BRIGADE_INSERT_TAIL(bb, b);
-        b = apr_bucket_eos_create(c->bucket_alloc);
-        APR_BRIGADE_INSERT_TAIL(bb, b);
-
-        if ((ret = ap_scan_script_header_err_brigade_ex(r, bb, sbuf,
-                                                        APLOG_MODULE_INDEX)))
-        {
-            ret = log_script(r, conf, ret, dbuf, sbuf, bb, NULL);
-
-            /*
-             * ret could be HTTP_NOT_MODIFIED in the case that the CGI script
-             * does not set an explicit status and ap_meets_conditions, which
-             * is called by ap_scan_script_header_err_brigade, detects that
-             * the conditions of the requests are met and the response is
-             * not modified.
-             * In this case set r->status and return OK in order to prevent
-             * running through the error processing stack as this would
-             * break with mod_cache, if the conditions had been set by
-             * mod_cache itself to validate a stale entity.
-             * BTW: We circumvent the error processing stack anyway if the
-             * CGI script set an explicit status code (whatever it is) and
-             * the only possible values for ret here are:
-             *
-             * HTTP_NOT_MODIFIED          (set by ap_meets_conditions)
-             * HTTP_PRECONDITION_FAILED   (set by ap_meets_conditions)
-             * HTTP_INTERNAL_SERVER_ERROR (if something went wrong during the
-             * processing of the response of the CGI script, e.g broken headers
-             * or a crashed CGI process).
-             */
-            if (ret == HTTP_NOT_MODIFIED) {
-                r->status = ret;
-                return OK;
-            }
-
-            return ret;
-        }
-
-        location = apr_table_get(r->headers_out, "Location");
-
-        if (location && location[0] == '/' && r->status == 200) {
-
-            /* Soak up all the script output */
-            discard_script_output(bb);
-            apr_brigade_destroy(bb);
-            /* This redirect needs to be a GET no matter what the original
-             * method was.
-             */
-            r->method = "GET";
-            r->method_number = M_GET;
-
-            /* We already read the message body (if any), so don't allow
-             * the redirected request to think it has one. We can ignore
-             * Transfer-Encoding, since we used REQUEST_CHUNKED_ERROR.
-             */
-            apr_table_unset(r->headers_in, "Content-Length");
-
-            ap_internal_redirect_handler(location, r);
-            return OK;
-        }
-        else if (location && r->status == 200) {
-            /* XXX: Note that if a script wants to produce its own Redirect
-             * body, it now has to explicitly *say* "Status: 302"
-             */
-            discard_script_output(bb);
-            apr_brigade_destroy(bb);
-            return HTTP_MOVED_TEMPORARILY;
-        }
-
-        rv = ap_pass_brigade(r->output_filters, bb);
-        if (rv != APR_SUCCESS) { 
-            ap_log_rerror(APLOG_MARK, APLOG_TRACE1, rv, r,
-                          "Failed to flush CGI output to client");
-        }
-    }
-
-    if (nph) {
-        conn_rec *c = r->connection;
-        struct ap_filter_t *cur;
-
-        /* get rid of all filters up through protocol...  since we
-         * haven't parsed off the headers, there is no way they can
-         * work
-         */
-
-        cur = r->proto_output_filters;
-        while (cur && cur->frec->ftype < AP_FTYPE_CONNECTION) {
-            cur = cur->next;
-        }
-        r->output_filters = r->proto_output_filters = cur;
-
-        bb = apr_brigade_create(r->pool, c->bucket_alloc);
-        b = apr_bucket_pipe_create(tempsock, c->bucket_alloc);
-        APR_BRIGADE_INSERT_TAIL(bb, b);
-        b = apr_bucket_eos_create(c->bucket_alloc);
-        APR_BRIGADE_INSERT_TAIL(bb, b);
-        ap_pass_brigade(r->output_filters, bb);
-    }
+    bb = apr_brigade_create(r->pool, c->bucket_alloc);
+#ifdef HAVE_CGID_FDPASSING
+    b = cgi_bucket_create(r, dc->timeout, tempsock, script_err, c->bucket_alloc);
+    if (b == NULL)
+        return HTTP_INTERNAL_SERVER_ERROR; /* should call log_scripterror() w/ _UNAVAILABLE? */
+#else
+    b = apr_bucket_pipe_create(tempsock, c->bucket_alloc);
+#endif
+    APR_BRIGADE_INSERT_TAIL(bb, b);
+    b = apr_bucket_eos_create(c->bucket_alloc);
+    APR_BRIGADE_INSERT_TAIL(bb, b);
 
-    return OK; /* NOT r->status, even if it has changed. */
+    return cgi_handle_response(r, nph, bb, timeout, conf, dbuf, script_err);
 }
 
 
@@ -1829,7 +1877,7 @@
         return retval;
     }
 
-    send_req(sd, r, command, env, SSI_REQ);
+    send_req(sd, NULL, r, command, env, SSI_REQ);
 
     info = apr_palloc(r->pool, sizeof(struct cleanup_script_info));
     info->conf = conf;
--- httpd-2.4.41/modules/generators/cgi_common.h
+++ httpd-2.4.41/modules/generators/cgi_common.h
@@ -0,0 +1,359 @@
+/* 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 "apr.h"
+#include "apr_strings.h"
+#include "apr_buckets.h"
+#include "apr_lib.h"
+#include "apr_poll.h"
+
+#define APR_WANT_STRFUNC
+#define APR_WANT_MEMFUNC
+#include "apr_want.h"
+
+#include "httpd.h"
+#include "util_filter.h"
+
+static void discard_script_output(apr_bucket_brigade *bb)
+{
+    apr_bucket *e;
+    const char *buf;
+    apr_size_t len;
+
+    for (e = APR_BRIGADE_FIRST(bb);
+         e != APR_BRIGADE_SENTINEL(bb) && !APR_BUCKET_IS_EOS(e);
+         e = APR_BRIGADE_FIRST(bb))
+    {
+        if (apr_bucket_read(e, &buf, &len, APR_BLOCK_READ)) {
+            break;
+        }
+        apr_bucket_delete(e);
+    }
+}
+
+#ifdef WANT_CGI_BUCKET
+/* A CGI bucket type is needed to catch any output to stderr from the
+ * script; see PR 22030. */
+static const apr_bucket_type_t bucket_type_cgi;
+
+struct cgi_bucket_data {
+    apr_pollset_t *pollset;
+    request_rec *r;
+    apr_interval_time_t timeout;
+};
+
+/* Create a CGI bucket using pipes from script stdout 'out'
+ * and stderr 'err', for request 'r'. */
+static apr_bucket *cgi_bucket_create(request_rec *r,
+                                     apr_interval_time_t timeout,
+                                     apr_file_t *out, apr_file_t *err,
+                                     apr_bucket_alloc_t *list)
+{
+    apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);
+    apr_status_t rv;
+    apr_pollfd_t fd;
+    struct cgi_bucket_data *data = apr_palloc(r->pool, sizeof *data);
+
+    /* Disable APR timeout handling since we'll use poll() entirely. */
+    apr_file_pipe_timeout_set(out, 0);
+    apr_file_pipe_timeout_set(err, 0);
+    
+    APR_BUCKET_INIT(b);
+    b->free = apr_bucket_free;
+    b->list = list;
+    b->type = &bucket_type_cgi;
+    b->length = (apr_size_t)(-1);
+    b->start = -1;
+
+    /* Create the pollset */
+    rv = apr_pollset_create(&data->pollset, 2, r->pool, 0);
+    if (rv != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01217)
+                     "apr_pollset_create(); check system or user limits");
+        return NULL;
+    }
+
+    fd.desc_type = APR_POLL_FILE;
+    fd.reqevents = APR_POLLIN;
+    fd.p = r->pool;
+    fd.desc.f = out; /* script's stdout */
+    fd.client_data = (void *)1;
+    rv = apr_pollset_add(data->pollset, &fd);
+    if (rv != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01218)
+                     "apr_pollset_add(); check system or user limits");
+        return NULL;
+    }
+
+    fd.desc.f = err; /* script's stderr */
+    fd.client_data = (void *)2;
+    rv = apr_pollset_add(data->pollset, &fd);
+    if (rv != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01219)
+                     "apr_pollset_add(); check system or user limits");
+        return NULL;
+    }
+
+    data->r = r;
+    data->timeout = timeout;
+    b->data = data;
+    return b;
+}
+
+/* Create a duplicate CGI bucket using given bucket data */
+static apr_bucket *cgi_bucket_dup(struct cgi_bucket_data *data,
+                                  apr_bucket_alloc_t *list)
+{
+    apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);
+    APR_BUCKET_INIT(b);
+    b->free = apr_bucket_free;
+    b->list = list;
+    b->type = &bucket_type_cgi;
+    b->length = (apr_size_t)(-1);
+    b->start = -1;
+    b->data = data;
+    return b;
+}
+
+/* Handle stdout from CGI child.  Duplicate of logic from the _read
+ * method of the real APR pipe bucket implementation. */
+static apr_status_t cgi_read_stdout(apr_bucket *a, apr_file_t *out,
+                                    const char **str, apr_size_t *len)
+{
+    char *buf;
+    apr_status_t rv;
+
+    *str = NULL;
+    *len = APR_BUCKET_BUFF_SIZE;
+    buf = apr_bucket_alloc(*len, a->list); /* XXX: check for failure? */
+
+    rv = apr_file_read(out, buf, len);
+
+    if (rv != APR_SUCCESS && rv != APR_EOF) {
+        apr_bucket_free(buf);
+        return rv;
+    }
+
+    if (*len > 0) {
+        struct cgi_bucket_data *data = a->data;
+        apr_bucket_heap *h;
+
+        /* Change the current bucket to refer to what we read */
+        a = apr_bucket_heap_make(a, buf, *len, apr_bucket_free);
+        h = a->data;
+        h->alloc_len = APR_BUCKET_BUFF_SIZE; /* note the real buffer size */
+        *str = buf;
+        APR_BUCKET_INSERT_AFTER(a, cgi_bucket_dup(data, a->list));
+    }
+    else {
+        apr_bucket_free(buf);
+        a = apr_bucket_immortal_make(a, "", 0);
+        *str = a->data;
+    }
+    return rv;
+}
+
+/* Read method of CGI bucket: polls on stderr and stdout of the child,
+ * sending any stderr output immediately away to the error log. */
+static apr_status_t cgi_bucket_read(apr_bucket *b, const char **str,
+                                    apr_size_t *len, apr_read_type_e block)
+{
+    struct cgi_bucket_data *data = b->data;
+    apr_interval_time_t timeout = 0;
+    apr_status_t rv;
+    int gotdata = 0;
+
+    if (block != APR_NONBLOCK_READ) {
+        timeout = data->timeout > 0 ? data->timeout : data->r->server->timeout;
+    }
+
+    do {
+        const apr_pollfd_t *results;
+        apr_int32_t num;
+
+        rv = apr_pollset_poll(data->pollset, timeout, &num, &results);
+        if (APR_STATUS_IS_TIMEUP(rv)) {
+            if (timeout) {
+                ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, data->r, APLOGNO(01220)
+                              "Timeout waiting for output from CGI script %s",
+                              data->r->filename);
+                return rv;
+            }
+            else {
+                return APR_EAGAIN;
+            }
+        }
+        else if (APR_STATUS_IS_EINTR(rv)) {
+            continue;
+        }
+        else if (rv != APR_SUCCESS) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, data->r, APLOGNO(01221)
+                          "poll failed waiting for CGI child");
+            return rv;
+        }
+
+        for (; num; num--, results++) {
+            if (results[0].client_data == (void *)1) {
+                /* stdout */
+                rv = cgi_read_stdout(b, results[0].desc.f, str, len);
+                if (APR_STATUS_IS_EOF(rv)) {
+                    rv = APR_SUCCESS;
+                }
+                gotdata = 1;
+            } else {
+                /* stderr */
+                apr_status_t rv2 = log_script_err(data->r, results[0].desc.f);
+                if (APR_STATUS_IS_EOF(rv2)) {
+                    apr_pollset_remove(data->pollset, &results[0]);
+                }
+            }
+        }
+
+    } while (!gotdata);
+
+    return rv;
+}
+
+static const apr_bucket_type_t bucket_type_cgi = {
+    "CGI", 5, APR_BUCKET_DATA,
+    apr_bucket_destroy_noop,
+    cgi_bucket_read,
+    apr_bucket_setaside_notimpl,
+    apr_bucket_split_notimpl,
+    apr_bucket_copy_notimpl
+};
+
+#endif /* WANT_CGI_BUCKET */
+
+/* Handle the CGI response output, having set up the brigade with the
+ * CGI or PIPE bucket as appropriate. */
+static int cgi_handle_response(request_rec *r, int nph, apr_bucket_brigade *bb,
+                               apr_interval_time_t timeout, cgi_server_conf *conf,
+                               char *logdata, apr_file_t *script_err)
+{
+    apr_status_t rv;
+    
+    /* Handle script return... */
+    if (!nph) {
+        const char *location;
+        char sbuf[MAX_STRING_LEN];
+        int ret;
+
+        if ((ret = ap_scan_script_header_err_brigade_ex(r, bb, sbuf,
+                                                        APLOG_MODULE_INDEX)))
+        {
+            ret = log_script(r, conf, ret, logdata, sbuf, bb, script_err);
+
+            /*
+             * ret could be HTTP_NOT_MODIFIED in the case that the CGI script
+             * does not set an explicit status and ap_meets_conditions, which
+             * is called by ap_scan_script_header_err_brigade, detects that
+             * the conditions of the requests are met and the response is
+             * not modified.
+             * In this case set r->status and return OK in order to prevent
+             * running through the error processing stack as this would
+             * break with mod_cache, if the conditions had been set by
+             * mod_cache itself to validate a stale entity.
+             * BTW: We circumvent the error processing stack anyway if the
+             * CGI script set an explicit status code (whatever it is) and
+             * the only possible values for ret here are:
+             *
+             * HTTP_NOT_MODIFIED          (set by ap_meets_conditions)
+             * HTTP_PRECONDITION_FAILED   (set by ap_meets_conditions)
+             * HTTP_INTERNAL_SERVER_ERROR (if something went wrong during the
+             * processing of the response of the CGI script, e.g broken headers
+             * or a crashed CGI process).
+             */
+            if (ret == HTTP_NOT_MODIFIED) {
+                r->status = ret;
+                return OK;
+            }
+
+            return ret;
+        }
+
+        location = apr_table_get(r->headers_out, "Location");
+
+        if (location && r->status == 200) {
+            /* For a redirect whether internal or not, discard any
+             * remaining stdout from the script, and log any remaining
+             * stderr output, as normal. */
+            discard_script_output(bb);
+            apr_brigade_destroy(bb);
+
+            if (script_err) {
+                apr_file_pipe_timeout_set(script_err, timeout);
+                log_script_err(r, script_err);
+            }
+        }
+
+        if (location && location[0] == '/' && r->status == 200) {
+            /* This redirect needs to be a GET no matter what the original
+             * method was.
+             */
+            r->method = "GET";
+            r->method_number = M_GET;
+
+            /* We already read the message body (if any), so don't allow
+             * the redirected request to think it has one.  We can ignore
+             * Transfer-Encoding, since we used REQUEST_CHUNKED_ERROR.
+             */
+            apr_table_unset(r->headers_in, "Content-Length");
+
+            ap_internal_redirect_handler(location, r);
+            return OK;
+        }
+        else if (location && r->status == 200) {
+            /* XXX: Note that if a script wants to produce its own Redirect
+             * body, it now has to explicitly *say* "Status: 302"
+             */
+            discard_script_output(bb);
+            apr_brigade_destroy(bb);
+            return HTTP_MOVED_TEMPORARILY;
+        }
+
+        rv = ap_pass_brigade(r->output_filters, bb);
+    }
+    else /* nph */ {
+        struct ap_filter_t *cur;
+
+        /* get rid of all filters up through protocol...  since we
+         * haven't parsed off the headers, there is no way they can
+         * work
+         */
+
+        cur = r->proto_output_filters;
+        while (cur && cur->frec->ftype < AP_FTYPE_CONNECTION) {
+            cur = cur->next;
+        }
+        r->output_filters = r->proto_output_filters = cur;
+
+        rv = ap_pass_brigade(r->output_filters, bb);
+    }
+
+    /* don't soak up script output if errors occurred writing it
+     * out...  otherwise, we prolong the life of the script when the
+     * connection drops or we stopped sending output for some other
+     * reason */
+    if (script_err && rv == APR_SUCCESS && !r->connection->aborted) {
+        apr_file_pipe_timeout_set(script_err, timeout);
+        log_script_err(r, script_err);
+    }
+
+    if (script_err) apr_file_close(script_err);
+
+    return OK;                      /* NOT r->status, even if it has changed. */
+}