/* 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;

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 =

    (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 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;

    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 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,

     "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"),

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}

};

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 {

            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, 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, timeout);

                *script_err = procnew->err;

                if (!*script_err)

                    return APR_EBADF;

                apr_file_pipe_timeout_set(*script_err, 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;

}

#if APR_FILES_AS_SOCKETS

#define WANT_CGI_BUCKET

#endif

#include "cgi_common.h"

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;

    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;

    }

    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

    b = cgi_bucket_create(r, dc->timeout, 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);

    return cgi_handle_response(r, nph, bb, timeout, conf, dbuf, script_err);

}

/*============================================================================

 *============================================================================

 * 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, "",

                                 location, "", 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;