Adding upstream version 2.4.57.upstream/2.4.57

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

1 files changed, 1277 insertions, 0 deletions

diff --git a/modules/generators/mod_cgi.c b/modules/generators/mod_cgi.c
new file mode 100644
index 0000000..7e4b126
--- /dev/null
+++ b/modules/generators/mod_cgi.c
@@ -0,0 +1,1277 @@
+/* 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.
+ */
+
+/*
+ * http_script: keeps all script-related ramblings together.
+ *
+ * Compliant to CGI/1.1 spec
+ *
+ * Adapted by rst from original NCSA code by Rob McCool
+ *
+ * This modules uses a httpd core function (ap_add_common_vars) to add some new env vars, 
+ * like REDIRECT_URL and REDIRECT_QUERY_STRING for custom error responses and DOCUMENT_ROOT.
+ * It also adds SERVER_ADMIN - useful for scripts to know who to mail when they fail.
+ * 
+ */
+
+#include "apr.h"
+#include "apr_strings.h"
+#include "apr_thread_proc.h"    /* for RLIMIT stuff */
+#include "apr_optional.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 "util_filter.h"
+#include "ap_config.h"
+#include "httpd.h"
+#include "http_config.h"
+#include "http_request.h"
+#include "http_core.h"
+#include "http_protocol.h"
+#include "http_main.h"
+#include "http_log.h"
+#include "util_script.h"
+#include "ap_mpm.h"
+#include "mod_core.h"
+#include "mod_cgi.h"
+
+#if APR_HAVE_STRUCT_RLIMIT
+#if defined (RLIMIT_CPU) || defined (RLIMIT_NPROC) || defined (RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS)
+#define AP_CGI_USE_RLIMIT
+#endif
+#endif
+
+module AP_MODULE_DECLARE_DATA cgi_module;
+
+static APR_OPTIONAL_FN_TYPE(ap_register_include_handler) *cgi_pfn_reg_with_ssi;
+static APR_OPTIONAL_FN_TYPE(ap_ssi_get_tag_and_value) *cgi_pfn_gtv;
+static APR_OPTIONAL_FN_TYPE(ap_ssi_parse_string) *cgi_pfn_ps;
+static APR_OPTIONAL_FN_TYPE(ap_cgi_build_command) *cgi_build_command;
+
+/* Read and discard the data in the brigade produced by a CGI script */
+static void discard_script_output(apr_bucket_brigade *bb);
+
+/* KLUDGE --- for back-combatibility, we don't have to check ExecCGI
+ * in ScriptAliased directories, which means we need to know if this
+ * request came through ScriptAlias or not... so the Alias module
+ * leaves a note for us.
+ */
+
+static int is_scriptaliased(request_rec *r)
+{
+    const char *t = apr_table_get(r->notes, "alias-forced-type");
+    return t && (!strcasecmp(t, "cgi-script"));
+}
+
+/* Configuration stuff */
+
+#define DEFAULT_LOGBYTES 10385760
+#define DEFAULT_BUFBYTES 1024
+
+typedef struct {
+    const char *logname;
+    long        logbytes;
+    apr_size_t  bufbytes;
+} cgi_server_conf;
+
+static void *create_cgi_config(apr_pool_t *p, server_rec *s)
+{
+    cgi_server_conf *c =
+    (cgi_server_conf *) apr_pcalloc(p, sizeof(cgi_server_conf));
+
+    c->logname = NULL;
+    c->logbytes = DEFAULT_LOGBYTES;
+    c->bufbytes = DEFAULT_BUFBYTES;
+
+    return c;
+}
+
+static void *merge_cgi_config(apr_pool_t *p, void *basev, void *overridesv)
+{
+    cgi_server_conf *base = (cgi_server_conf *) basev,
+                    *overrides = (cgi_server_conf *) overridesv;
+
+    return overrides->logname ? overrides : base;
+}
+
+static const char *set_scriptlog(cmd_parms *cmd, void *dummy, const char *arg)
+{
+    server_rec *s = cmd->server;
+    cgi_server_conf *conf = ap_get_module_config(s->module_config,
+                                                 &cgi_module);
+
+    conf->logname = ap_server_root_relative(cmd->pool, arg);
+
+    if (!conf->logname) {
+        return apr_pstrcat(cmd->pool, "Invalid ScriptLog path ",
+                           arg, NULL);
+    }
+
+    return NULL;
+}
+
+static const char *set_scriptlog_length(cmd_parms *cmd, void *dummy,
+                                        const char *arg)
+{
+    server_rec *s = cmd->server;
+    cgi_server_conf *conf = ap_get_module_config(s->module_config,
+                                                 &cgi_module);
+
+    conf->logbytes = atol(arg);
+    return NULL;
+}
+
+static const char *set_scriptlog_buffer(cmd_parms *cmd, void *dummy,
+                                        const char *arg)
+{
+    server_rec *s = cmd->server;
+    cgi_server_conf *conf = ap_get_module_config(s->module_config,
+                                                 &cgi_module);
+
+    conf->bufbytes = atoi(arg);
+    return NULL;
+}
+
+static const command_rec cgi_cmds[] =
+{
+AP_INIT_TAKE1("ScriptLog", set_scriptlog, NULL, RSRC_CONF,
+     "the name of a log for script debugging info"),
+AP_INIT_TAKE1("ScriptLogLength", set_scriptlog_length, NULL, RSRC_CONF,
+     "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"),
+    {NULL}
+};
+
+static int log_scripterror(request_rec *r, cgi_server_conf * conf, int ret,
+                           apr_status_t rv, char *logno, char *error)
+{
+    apr_file_t *f = NULL;
+    apr_finfo_t finfo;
+    char time_str[APR_CTIME_LEN];
+    int log_flags = rv ? APLOG_ERR : APLOG_ERR;
+
+    /* Intentional no APLOGNO */
+    /* Callee provides APLOGNO in error text */
+    ap_log_rerror(APLOG_MARK, log_flags, rv, r,
+                  "%s%s: %s", logno ? logno : "", error, r->filename);
+
+    /* XXX Very expensive mainline case! Open, then getfileinfo! */
+    if (!conf->logname ||
+        ((apr_stat(&finfo, conf->logname,
+                   APR_FINFO_SIZE, r->pool) == APR_SUCCESS) &&
+         (finfo.size > conf->logbytes)) ||
+        (apr_file_open(&f, conf->logname,
+                       APR_APPEND|APR_WRITE|APR_CREATE, APR_OS_DEFAULT,
+                       r->pool) != APR_SUCCESS)) {
+        return ret;
+    }
+
+    /* "%% [Wed Jun 19 10:53:21 1996] GET /cgi-bin/printenv HTTP/1.0" */
+    apr_ctime(time_str, apr_time_now());
+    apr_file_printf(f, "%%%% [%s] %s %s%s%s %s\n", time_str, r->method, r->uri,
+                    r->args ? "?" : "", r->args ? r->args : "", r->protocol);
+    /* "%% 500 /usr/local/apache/cgi-bin */
+    apr_file_printf(f, "%%%% %d %s\n", ret, r->filename);
+
+    apr_file_printf(f, "%%error\n%s\n", error);
+
+    apr_file_close(f);
+    return ret;
+}
+
+/* Soak up stderr from a script and redirect it to the error log.
+ */
+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;
+    cgi_server_conf *conf = ap_get_module_config(r->server->module_config, &cgi_module);
+
+    while ((rv = apr_file_gets(argsbuffer, HUGE_STRING_LEN,
+                               script_err)) == APR_SUCCESS) {
+        newline = strchr(argsbuffer, '\n');
+        if (newline) {
+            *newline = '\0';
+        }
+        log_scripterror(r, conf, r->status, 0, APLOGNO(01215), argsbuffer);
+    }
+
+    return rv;
+}
+
+static int log_script(request_rec *r, cgi_server_conf * conf, int ret,
+                      char *dbuf, const char *sbuf, apr_bucket_brigade *bb,
+                      apr_file_t *script_err)
+{
+    const apr_array_header_t *hdrs_arr = apr_table_elts(r->headers_in);
+    const apr_table_entry_t *hdrs = (const apr_table_entry_t *) hdrs_arr->elts;
+    char argsbuffer[HUGE_STRING_LEN];
+    apr_file_t *f = NULL;
+    apr_bucket *e;
+    const char *buf;
+    apr_size_t len;
+    apr_status_t rv;
+    int first;
+    int i;
+    apr_finfo_t finfo;
+    char time_str[APR_CTIME_LEN];
+
+    /* XXX Very expensive mainline case! Open, then getfileinfo! */
+    if (!conf->logname ||
+        ((apr_stat(&finfo, conf->logname,
+                   APR_FINFO_SIZE, r->pool) == APR_SUCCESS) &&
+         (finfo.size > conf->logbytes)) ||
+        (apr_file_open(&f, conf->logname,
+                       APR_APPEND|APR_WRITE|APR_CREATE, APR_OS_DEFAULT,
+                       r->pool) != APR_SUCCESS)) {
+        /* Soak up script output */
+        discard_script_output(bb);
+        log_script_err(r, script_err);
+        return ret;
+    }
+
+    /* "%% [Wed Jun 19 10:53:21 1996] GET /cgi-bin/printenv HTTP/1.0" */
+    apr_ctime(time_str, apr_time_now());
+    apr_file_printf(f, "%%%% [%s] %s %s%s%s %s\n", time_str, r->method, r->uri,
+                    r->args ? "?" : "", r->args ? r->args : "", r->protocol);
+    /* "%% 500 /usr/local/apache/cgi-bin" */
+    apr_file_printf(f, "%%%% %d %s\n", ret, r->filename);
+
+    apr_file_puts("%request\n", f);
+    for (i = 0; i < hdrs_arr->nelts; ++i) {
+        if (!hdrs[i].key)
+            continue;
+        apr_file_printf(f, "%s: %s\n", hdrs[i].key, hdrs[i].val);
+    }
+    if ((r->method_number == M_POST || r->method_number == M_PUT) &&
+        *dbuf) {
+        apr_file_printf(f, "\n%s\n", dbuf);
+    }
+
+    apr_file_puts("%response\n", f);
+    hdrs_arr = apr_table_elts(r->err_headers_out);
+    hdrs = (const apr_table_entry_t *) hdrs_arr->elts;
+
+    for (i = 0; i < hdrs_arr->nelts; ++i) {
+        if (!hdrs[i].key)
+            continue;
+        apr_file_printf(f, "%s: %s\n", hdrs[i].key, hdrs[i].val);
+    }
+
+    if (sbuf && *sbuf)
+        apr_file_printf(f, "%s\n", sbuf);
+
+    first = 1;
+    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 || (len == 0)) {
+            break;
+        }
+        if (first) {
+            apr_file_puts("%stdout\n", f);
+            first = 0;
+        }
+        apr_file_write(f, buf, &len);
+        apr_file_puts("\n", f);
+    }
+
+    if (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_err) == APR_SUCCESS) {
+        apr_file_puts("%stderr\n", f);
+        apr_file_puts(argsbuffer, f);
+        while (apr_file_gets(argsbuffer, HUGE_STRING_LEN,
+                             script_err) == APR_SUCCESS) {
+            apr_file_puts(argsbuffer, f);
+        }
+        apr_file_puts("\n", f);
+    }
+
+    apr_brigade_destroy(bb);
+    apr_file_close(script_err);
+
+    apr_file_close(f);
+    return ret;
+}
+
+
+/* This is the special environment used for running the "exec cmd="
+ *   variety of SSI directives.
+ */
+static void add_ssi_vars(request_rec *r)
+{
+    apr_table_t *e = r->subprocess_env;
+
+    if (r->path_info && r->path_info[0] != '\0') {
+        request_rec *pa_req;
+
+        apr_table_setn(e, "PATH_INFO", ap_escape_shell_cmd(r->pool,
+                                                           r->path_info));
+
+        pa_req = ap_sub_req_lookup_uri(ap_escape_uri(r->pool, r->path_info),
+                                       r, NULL);
+        if (pa_req->filename) {
+            apr_table_setn(e, "PATH_TRANSLATED",
+                           apr_pstrcat(r->pool, pa_req->filename,
+                                       pa_req->path_info, NULL));
+        }
+        ap_destroy_sub_req(pa_req);
+    }
+
+    if (r->args) {
+        char *arg_copy = apr_pstrdup(r->pool, r->args);
+
+        apr_table_setn(e, "QUERY_STRING", r->args);
+        ap_unescape_url(arg_copy);
+        apr_table_setn(e, "QUERY_STRING_UNESCAPED",
+                       ap_escape_shell_cmd(r->pool, arg_copy));
+    }
+}
+
+static void cgi_child_errfn(apr_pool_t *pool, apr_status_t err,
+                            const char *description)
+{
+    apr_file_t *stderr_log;
+
+    apr_file_open_stderr(&stderr_log, pool);
+    /* Escape the logged string because it may be something that
+     * came in over the network.
+     */
+    apr_file_printf(stderr_log,
+                    "(%d)%pm: %s\n",
+                    err,
+                    &err,
+#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
+                    ap_escape_logitem(pool,
+#endif
+                    description
+#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
+                    )
+#endif
+                    );
+}
+
+static apr_status_t run_cgi_child(apr_file_t **script_out,
+                                  apr_file_t **script_in,
+                                  apr_file_t **script_err,
+                                  const char *command,
+                                  const char * const argv[],
+                                  request_rec *r,
+                                  apr_pool_t *p,
+                                  cgi_exec_info_t *e_info)
+{
+    const char * const *env;
+    apr_procattr_t *procattr;
+    apr_proc_t *procnew;
+    apr_status_t rc = APR_SUCCESS;
+
+#ifdef AP_CGI_USE_RLIMIT
+    core_dir_config *conf = ap_get_core_module_config(r->per_dir_config);
+#endif
+
+#ifdef DEBUG_CGI
+#ifdef OS2
+    /* Under OS/2 need to use device con. */
+    FILE *dbg = fopen("con", "w");
+#else
+    FILE *dbg = fopen("/dev/tty", "w");
+#endif
+    int i;
+#endif
+
+    RAISE_SIGSTOP(CGI_CHILD);
+#ifdef DEBUG_CGI
+    fprintf(dbg, "Attempting to exec %s as CGI child (argv0 = %s)\n",
+            r->filename, argv[0]);
+#endif
+
+    env = (const char * const *)ap_create_environment(p, r->subprocess_env);
+
+#ifdef DEBUG_CGI
+    fprintf(dbg, "Environment: \n");
+    for (i = 0; env[i]; ++i)
+        fprintf(dbg, "'%s'\n", env[i]);
+    fclose(dbg);
+#endif
+
+    /* Transmute ourselves into the script.
+     * NB only ISINDEX scripts get decoded arguments.
+     */
+    if (((rc = apr_procattr_create(&procattr, p)) != APR_SUCCESS) ||
+        ((rc = apr_procattr_io_set(procattr,
+                                   e_info->in_pipe,
+                                   e_info->out_pipe,
+                                   e_info->err_pipe)) != APR_SUCCESS) ||
+        ((rc = apr_procattr_dir_set(procattr,
+                        ap_make_dirstr_parent(r->pool,
+                                              r->filename))) != APR_SUCCESS) ||
+#if defined(RLIMIT_CPU) && defined(AP_CGI_USE_RLIMIT)
+        ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_CPU,
+                                      conf->limit_cpu)) != APR_SUCCESS) ||
+#endif
+#if defined(AP_CGI_USE_RLIMIT) && (defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS))
+        ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_MEM,
+                                      conf->limit_mem)) != APR_SUCCESS) ||
+#endif
+#if defined(RLIMIT_NPROC) && defined(AP_CGI_USE_RLIMIT)
+        ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_NPROC,
+                                      conf->limit_nproc)) != APR_SUCCESS) ||
+#endif
+        ((rc = apr_procattr_cmdtype_set(procattr,
+                                        e_info->cmd_type)) != APR_SUCCESS) ||
+
+        ((rc = apr_procattr_detach_set(procattr,
+                                        e_info->detached)) != APR_SUCCESS) ||
+        ((rc = apr_procattr_addrspace_set(procattr,
+                                        e_info->addrspace)) != APR_SUCCESS) ||
+        ((rc = apr_procattr_child_errfn_set(procattr, cgi_child_errfn)) != APR_SUCCESS)) {
+        /* Something bad happened, tell the world. */
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r, APLOGNO(01216)
+                      "couldn't set child process attributes: %s", r->filename);
+    }
+    else {
+        procnew = apr_pcalloc(p, sizeof(*procnew));
+        rc = ap_os_create_privileged_process(r, procnew, command, argv, env,
+                                             procattr, p);
+
+        if (rc != APR_SUCCESS) {
+            /* Bad things happened. Everyone should have cleaned up. */
+            /* Intentional no APLOGNO */
+            ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_TOCLIENT, rc, r,
+                          "couldn't create child process: %d: %s", rc,
+                          apr_filepath_name_get(r->filename));
+        }
+        else {
+            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);
+
+            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);
+
+                *script_err = procnew->err;
+                if (!*script_err)
+                    return APR_EBADF;
+                apr_file_pipe_timeout_set(*script_err, r->server->timeout);
+            }
+        }
+    }
+    return (rc);
+}
+
+
+static apr_status_t default_build_command(const char **cmd, const char ***argv,
+                                          request_rec *r, apr_pool_t *p,
+                                          cgi_exec_info_t *e_info)
+{
+    int numwords, x, idx;
+    char *w;
+    const char *args = NULL;
+
+    if (e_info->process_cgi) {
+        *cmd = r->filename;
+        /* Do not process r->args if they contain an '=' assignment
+         */
+        if (r->args && r->args[0] && !ap_strchr_c(r->args, '=')) {
+            args = r->args;
+        }
+    }
+
+    if (!args) {
+        numwords = 1;
+    }
+    else {
+        /* count the number of keywords */
+        for (x = 0, numwords = 2; args[x]; x++) {
+            if (args[x] == '+') {
+                ++numwords;
+            }
+        }
+    }
+    /* Everything is - 1 to account for the first parameter
+     * which is the program name.
+     */
+    if (numwords > APACHE_ARG_MAX - 1) {
+        numwords = APACHE_ARG_MAX - 1;    /* Truncate args to prevent overrun */
+    }
+    *argv = apr_palloc(p, (numwords + 2) * sizeof(char *));
+    (*argv)[0] = *cmd;
+    for (x = 1, idx = 1; x < numwords; x++) {
+        w = ap_getword_nulls(p, &args, '+');
+        ap_unescape_url(w);
+        (*argv)[idx++] = ap_escape_shell_cmd(p, w);
+    }
+    (*argv)[idx] = NULL;
+
+    return APR_SUCCESS;
+}
+
+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);
+    }
+}
+
+#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
+};
+
+#endif
+
+static int cgi_handler(request_rec *r)
+{
+    int nph;
+    apr_size_t dbpos = 0;
+    const char *argv0;
+    const char *command;
+    const char **argv;
+    char *dbuf = NULL;
+    apr_file_t *script_out = NULL, *script_in = NULL, *script_err = NULL;
+    apr_bucket_brigade *bb;
+    apr_bucket *b;
+    int is_included;
+    int seen_eos, child_stopped_reading;
+    apr_pool_t *p;
+    cgi_server_conf *conf;
+    apr_status_t rv;
+    cgi_exec_info_t e_info;
+    conn_rec *c;
+
+    if (strcmp(r->handler, CGI_MAGIC_TYPE) && strcmp(r->handler, "cgi-script")) {
+        return DECLINED;
+    }
+
+    c = r->connection;
+
+    is_included = !strcmp(r->protocol, "INCLUDED");
+
+    p = r->main ? r->main->pool : r->pool;
+
+    argv0 = apr_filepath_name_get(r->filename);
+    nph = !(strncmp(argv0, "nph-", 4));
+    conf = ap_get_module_config(r->server->module_config, &cgi_module);
+
+    if (!(ap_allow_options(r) & OPT_EXECCGI) && !is_scriptaliased(r))
+        return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, APLOGNO(02809),
+                               "Options ExecCGI is off in this directory");
+    if (nph && is_included)
+        return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, APLOGNO(02810),
+                               "attempt to include NPH CGI script");
+
+    if (r->finfo.filetype == APR_NOFILE)
+        return log_scripterror(r, conf, HTTP_NOT_FOUND, 0, APLOGNO(02811),
+                               "script not found or unable to stat");
+    if (r->finfo.filetype == APR_DIR)
+        return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, APLOGNO(02812),
+                               "attempt to invoke directory as script");
+
+    if ((r->used_path_info == AP_REQ_REJECT_PATH_INFO) &&
+        r->path_info && *r->path_info)
+    {
+        /* default to accept */
+        return log_scripterror(r, conf, HTTP_NOT_FOUND, 0, APLOGNO(02813),
+                               "AcceptPathInfo off disallows user's path");
+    }
+/*
+    if (!ap_suexec_enabled) {
+        if (!ap_can_exec(&r->finfo))
+            return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, APLOGNO(03194)
+                                   "file permissions deny server execution");
+    }
+
+*/
+    ap_add_common_vars(r);
+    ap_add_cgi_vars(r);
+
+    e_info.process_cgi = 1;
+    e_info.cmd_type    = APR_PROGRAM;
+    e_info.detached    = 0;
+    e_info.in_pipe     = APR_CHILD_BLOCK;
+    e_info.out_pipe    = APR_CHILD_BLOCK;
+    e_info.err_pipe    = APR_CHILD_BLOCK;
+    e_info.prog_type   = RUN_AS_CGI;
+    e_info.bb          = NULL;
+    e_info.ctx         = NULL;
+    e_info.next        = NULL;
+    e_info.addrspace   = 0;
+
+    /* build the command line */
+    if ((rv = cgi_build_command(&command, &argv, r, p, &e_info)) != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01222)
+                      "don't know how to spawn child process: %s",
+                      r->filename);
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    /* run the script in its own process */
+    if ((rv = run_cgi_child(&script_out, &script_in, &script_err,
+                            command, argv, r, p, &e_info)) != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01223)
+                      "couldn't spawn child process: %s", r->filename);
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    /* Transfer any put/post args, CERN style...
+     * Note that we already ignore SIGPIPE in the core server.
+     */
+    bb = apr_brigade_create(r->pool, c->bucket_alloc);
+    seen_eos = 0;
+    child_stopped_reading = 0;
+    if (conf->logname) {
+        dbuf = apr_palloc(r->pool, conf->bufbytes + 1);
+        dbpos = 0;
+    }
+    do {
+        apr_bucket *bucket;
+
+        rv = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES,
+                            APR_BLOCK_READ, HUGE_STRING_LEN);
+
+        if (rv != APR_SUCCESS) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01225)
+                          "Error reading request entity data");
+            return ap_map_http_request_error(rv, HTTP_BAD_REQUEST);
+        }
+
+        for (bucket = APR_BRIGADE_FIRST(bb);
+             bucket != APR_BRIGADE_SENTINEL(bb);
+             bucket = APR_BUCKET_NEXT(bucket))
+        {
+            const char *data;
+            apr_size_t len;
+
+            if (APR_BUCKET_IS_EOS(bucket)) {
+                seen_eos = 1;
+                break;
+            }
+
+            /* We can't do much with this. */
+            if (APR_BUCKET_IS_FLUSH(bucket)) {
+                continue;
+            }
+
+            /* If the child stopped, we still must read to EOS. */
+            if (child_stopped_reading) {
+                continue;
+            }
+
+            /* read */
+            apr_bucket_read(bucket, &data, &len, APR_BLOCK_READ);
+
+            if (conf->logname && dbpos < conf->bufbytes) {
+                int cursize;
+
+                if ((dbpos + len) > conf->bufbytes) {
+                    cursize = conf->bufbytes - dbpos;
+                }
+                else {
+                    cursize = len;
+                }
+                memcpy(dbuf + dbpos, data, cursize);
+                dbpos += cursize;
+            }
+
+            /* Keep writing data to the child until done or too much time
+             * elapses with no progress or an error occurs.
+             */
+            rv = apr_file_write_full(script_out, data, len, NULL);
+
+            if (rv != APR_SUCCESS) {
+                /* silly script stopped reading, soak up remaining message */
+                child_stopped_reading = 1;
+            }
+        }
+        apr_brigade_cleanup(bb);
+    }
+    while (!seen_eos);
+
+    if (conf->logname) {
+        dbuf[dbpos] = '\0';
+    }
+    /* Is this flush really needed? */
+    apr_file_flush(script_out);
+    apr_file_close(script_out);
+
+    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);
+    if (b == NULL)
+        return HTTP_INTERNAL_SERVER_ERROR;
+#else
+    b = apr_bucket_pipe_create(script_in, c->bucket_alloc);
+#endif
+    APR_BRIGADE_INSERT_TAIL(bb, b);
+    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. */
+}
+
+/*============================================================================
+ *============================================================================
+ * This is the beginning of the cgi filter code moved from mod_include. This
+ *   is the code required to handle the "exec" SSI directive.
+ *============================================================================
+ *============================================================================*/
+static apr_status_t include_cgi(include_ctx_t *ctx, ap_filter_t *f,
+                                apr_bucket_brigade *bb, char *s)
+{
+    request_rec *r = f->r;
+    request_rec *rr = ap_sub_req_lookup_uri(s, r, f->next);
+    int rr_status;
+
+    if (rr->status != HTTP_OK) {
+        ap_destroy_sub_req(rr);
+        return APR_EGENERAL;
+    }
+
+    /* No hardwired path info or query allowed */
+    if ((rr->path_info && rr->path_info[0]) || rr->args) {
+        ap_destroy_sub_req(rr);
+        return APR_EGENERAL;
+    }
+    if (rr->finfo.filetype != APR_REG) {
+        ap_destroy_sub_req(rr);
+        return APR_EGENERAL;
+    }
+
+    /* Script gets parameters of the *document*, for back compatibility */
+    rr->path_info = r->path_info;       /* hard to get right; see mod_cgi.c */
+    rr->args = r->args;
+
+    /* Force sub_req to be treated as a CGI request, even if ordinary
+     * typing rules would have called it something else.
+     */
+    ap_set_content_type(rr, CGI_MAGIC_TYPE);
+
+    /* Run it. */
+    rr_status = ap_run_sub_req(rr);
+    if (ap_is_HTTP_REDIRECT(rr_status)) {
+        const char *location = apr_table_get(rr->headers_out, "Location");
+
+        if (location) {
+            char *buffer;
+
+            location = ap_escape_html(rr->pool, location);
+            buffer = apr_pstrcat(ctx->pool, "<a href=\"", location, "\">",
+                                 location, "</a>", NULL);
+
+            APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_pool_create(buffer,
+                                    strlen(buffer), ctx->pool,
+                                    f->c->bucket_alloc));
+        }
+    }
+
+    ap_destroy_sub_req(rr);
+
+    return APR_SUCCESS;
+}
+
+static apr_status_t include_cmd(include_ctx_t *ctx, ap_filter_t *f,
+                                apr_bucket_brigade *bb, const char *command)
+{
+    cgi_exec_info_t  e_info;
+    const char **argv;
+    apr_file_t *script_out = NULL, *script_in = NULL, *script_err = NULL;
+    apr_status_t rv;
+    request_rec *r = f->r;
+
+    add_ssi_vars(r);
+
+    e_info.process_cgi = 0;
+    e_info.cmd_type    = APR_SHELLCMD;
+    e_info.detached    = 0;
+    e_info.in_pipe     = APR_NO_PIPE;
+    e_info.out_pipe    = APR_FULL_BLOCK;
+    e_info.err_pipe    = APR_NO_PIPE;
+    e_info.prog_type   = RUN_AS_SSI;
+    e_info.bb          = &bb;
+    e_info.ctx         = ctx;
+    e_info.next        = f->next;
+    e_info.addrspace   = 0;
+
+    if ((rv = cgi_build_command(&command, &argv, r, r->pool,
+                                &e_info)) != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01226)
+                      "don't know how to spawn cmd child process: %s",
+                      r->filename);
+        return rv;
+    }
+
+    /* run the script in its own process */
+    if ((rv = run_cgi_child(&script_out, &script_in, &script_err,
+                            command, argv, r, r->pool,
+                            &e_info)) != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01227)
+                      "couldn't spawn child process: %s", r->filename);
+        return rv;
+    }
+
+    APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_pipe_create(script_in,
+                            f->c->bucket_alloc));
+    ctx->flush_now = 1;
+
+    /* We can't close the pipe here, because we may return before the
+     * full CGI has been sent to the network.  That's okay though,
+     * because we can rely on the pool to close the pipe for us.
+     */
+    return APR_SUCCESS;
+}
+
+static apr_status_t handle_exec(include_ctx_t *ctx, ap_filter_t *f,
+                                apr_bucket_brigade *bb)
+{
+    char *tag = NULL;
+    char *tag_val = NULL;
+    request_rec *r = f->r;
+    char *file = r->filename;
+    char parsed_string[MAX_STRING_LEN];
+
+    if (!ctx->argc) {
+        ap_log_rerror(APLOG_MARK,
+                      (ctx->flags & SSI_FLAG_PRINTING)
+                          ? APLOG_ERR : APLOG_WARNING,
+                      0, r, APLOGNO(03195)
+                      "missing argument for exec element in %s", r->filename);
+    }
+
+    if (!(ctx->flags & SSI_FLAG_PRINTING)) {
+        return APR_SUCCESS;
+    }
+
+    if (!ctx->argc) {
+        SSI_CREATE_ERROR_BUCKET(ctx, f, bb);
+        return APR_SUCCESS;
+    }
+
+    if (ctx->flags & SSI_FLAG_NO_EXEC) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01228) "exec used but not allowed "
+                      "in %s", r->filename);
+        SSI_CREATE_ERROR_BUCKET(ctx, f, bb);
+        return APR_SUCCESS;
+    }
+
+    while (1) {
+        cgi_pfn_gtv(ctx, &tag, &tag_val, SSI_VALUE_DECODED);
+        if (!tag || !tag_val) {
+            break;
+        }
+
+        if (!strcmp(tag, "cmd")) {
+            apr_status_t rv;
+
+            cgi_pfn_ps(ctx, tag_val, parsed_string, sizeof(parsed_string),
+                       SSI_EXPAND_LEAVE_NAME);
+
+            rv = include_cmd(ctx, f, bb, parsed_string);
+            if (rv != APR_SUCCESS) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01229) "execution failure "
+                              "for parameter \"%s\" to tag exec in file %s",
+                              tag, r->filename);
+                SSI_CREATE_ERROR_BUCKET(ctx, f, bb);
+                break;
+            }
+        }
+        else if (!strcmp(tag, "cgi")) {
+            apr_status_t rv;
+
+            cgi_pfn_ps(ctx, tag_val, parsed_string, sizeof(parsed_string),
+                       SSI_EXPAND_DROP_NAME);
+
+            rv = include_cgi(ctx, f, bb, parsed_string);
+            if (rv != APR_SUCCESS) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01230) "invalid CGI ref "
+                              "\"%s\" in %s", tag_val, file);
+                SSI_CREATE_ERROR_BUCKET(ctx, f, bb);
+                break;
+            }
+        }
+        else {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01231) "unknown parameter "
+                          "\"%s\" to tag exec in %s", tag, file);
+            SSI_CREATE_ERROR_BUCKET(ctx, f, bb);
+            break;
+        }
+    }
+
+    return APR_SUCCESS;
+}
+
+
+/*============================================================================
+ *============================================================================
+ * This is the end of the cgi filter code moved from mod_include.
+ *============================================================================
+ *============================================================================*/
+
+
+static int cgi_post_config(apr_pool_t *p, apr_pool_t *plog,
+                                apr_pool_t *ptemp, server_rec *s)
+{
+    cgi_pfn_reg_with_ssi = APR_RETRIEVE_OPTIONAL_FN(ap_register_include_handler);
+    cgi_pfn_gtv          = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_get_tag_and_value);
+    cgi_pfn_ps           = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_parse_string);
+
+    if ((cgi_pfn_reg_with_ssi) && (cgi_pfn_gtv) && (cgi_pfn_ps)) {
+        /* Required by mod_include filter. This is how mod_cgi registers
+         *   with mod_include to provide processing of the exec directive.
+         */
+        cgi_pfn_reg_with_ssi("exec", handle_exec);
+    }
+
+    /* This is the means by which unusual (non-unix) os's may find alternate
+     * means to run a given command (e.g. shebang/registry parsing on Win32)
+     */
+    cgi_build_command    = APR_RETRIEVE_OPTIONAL_FN(ap_cgi_build_command);
+    if (!cgi_build_command) {
+        cgi_build_command = default_build_command;
+    }
+    return OK;
+}
+
+static void register_hooks(apr_pool_t *p)
+{
+    static const char * const aszPre[] = { "mod_include.c", NULL };
+    ap_hook_handler(cgi_handler, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_post_config(cgi_post_config, aszPre, NULL, APR_HOOK_REALLY_FIRST);
+}
+
+AP_DECLARE_MODULE(cgi) =
+{
+    STANDARD20_MODULE_STUFF,
+    NULL,                        /* dir config creater */
+    NULL,                        /* dir merger --- default is to override */
+    create_cgi_config,           /* server config */
+    merge_cgi_config,            /* merge server config */
+    cgi_cmds,                    /* command apr_table_t */
+    register_hooks               /* register hooks */
+};