/* Copyright 1999-2004 The Apache Software Foundation
 *
 * Licensed 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.
 */

#define CORE_PRIVATE
#include "httpd.h"
#include "http_config.h"
#include "http_conf_globals.h"
#include "http_main.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_core.h"		/* For document_root.  Sigh... */
#include "http_request.h"	/* for sub_req_lookup_uri() */
#include "util_script.h"
#include "util_date.h"		/* For parseHTTPdate() */

#ifdef OS2
#define INCL_DOS
#include <os2.h>
#endif

/*
 * Various utility functions which are common to a whole lot of
 * script-type extensions mechanisms, and might as well be gathered
 * in one place (if only to avoid creating inter-module dependancies
 * where there don't have to be).
 */

#define MALFORMED_MESSAGE "malformed header from script. Bad header="
#define MALFORMED_HEADER_LENGTH_TO_SHOW 30

/* If a request includes query info in the URL (stuff after "?"), and
 * the query info does not contain "=" (indicative of a FORM submission),
 * then this routine is called to create the argument list to be passed
 * to the CGI script.  When suexec is enabled, the suexec path, user, and
 * group are the first three arguments to be passed; if not, all three
 * must be NULL.  The query info is split into separate arguments, where
 * "+" is the separator between keyword arguments.
 */
static char **create_argv(pool *p, char *path, char *user, char *group,
			  char *av0, const char *args)
{
    int x, numwords;
    char **av;
    char *w;
    int idx = 0;

    /* count the number of keywords */

    for (x = 0, numwords = 1; args[x]; x++) {
        if (args[x] == '+') {
	    ++numwords;
	}
    }

    if (numwords > APACHE_ARG_MAX - 5) {
	numwords = APACHE_ARG_MAX - 5;	/* Truncate args to prevent overrun */
    }
    av = (char **) ap_palloc(p, (numwords + 5) * sizeof(char *));

    if (path) {
	av[idx++] = path;
    }
    if (user) {
	av[idx++] = user;
    }
    if (group) {
	av[idx++] = group;
    }

    av[idx++] = av0;

    for (x = 1; x <= numwords; x++) {
	w = ap_getword_nulls(p, &args, '+');
	ap_unescape_url(w);
	av[idx++] = ap_escape_shell_cmd(p, w);
    }
    av[idx] = NULL;
    return av;
}


static char *http2env(pool *a, char *w)
{
    char *res = ap_pstrcat(a, "HTTP_", w, NULL);
    char *cp = res;

    while (*++cp) {
	if (!ap_isalnum(*cp) && *cp != '_') {
	    *cp = '_';
	}
	else {
	    *cp = ap_toupper(*cp);
	}
    }

    return res;
}

API_EXPORT(char **) ap_create_environment(pool *p, table *t)
{
    array_header *env_arr = ap_table_elts(t);
    table_entry *elts = (table_entry *) env_arr->elts;
    char **env = (char **) ap_palloc(p, (env_arr->nelts + 2) * sizeof(char *));
    int i, j;
    char *tz;
    char *whack;

    j = 0;
    if (!ap_table_get(t, "TZ")) {
	tz = getenv("TZ");
	if (tz != NULL) {
	    env[j++] = ap_pstrcat(p, "TZ=", tz, NULL);
	}
    }
    for (i = 0; i < env_arr->nelts; ++i) {
        if (!elts[i].key) {
	    continue;
	}
	env[j] = ap_pstrcat(p, elts[i].key, "=", elts[i].val, NULL);
	whack = env[j];
	if (ap_isdigit(*whack)) {
	    *whack++ = '_';
	}
	while (*whack != '=') {
	    if (!ap_isalnum(*whack) && *whack != '_') {
		*whack = '_';
	    }
	    ++whack;
	}
	++j;
    }

    env[j] = NULL;
    return env;
}

API_EXPORT(void) ap_add_common_vars(request_rec *r)
{
    table *e;
    server_rec *s = r->server;
    conn_rec *c = r->connection;
    const char *rem_logname;
    char *env_path;
#if defined(WIN32) || defined(OS2)
    char *env_temp;
#endif
    const char *host;
    array_header *hdrs_arr = ap_table_elts(r->headers_in);
    table_entry *hdrs = (table_entry *) hdrs_arr->elts;
    int i;

    /* use a temporary table which we'll overlap onto
     * r->subprocess_env later
     */
    e = ap_make_table(r->pool, 25 + hdrs_arr->nelts);

    /* First, add environment vars from headers... this is as per
     * CGI specs, though other sorts of scripting interfaces see
     * the same vars...
     */

    for (i = 0; i < hdrs_arr->nelts; ++i) {
        if (!hdrs[i].key) {
	    continue;
	}

	/* A few headers are special cased --- Authorization to prevent
	 * rogue scripts from capturing passwords; content-type and -length
	 * for no particular reason.
	 */

	if (!strcasecmp(hdrs[i].key, "Content-type")) {
	    ap_table_addn(e, "CONTENT_TYPE", hdrs[i].val);
	}
	else if (!strcasecmp(hdrs[i].key, "Content-length")) {
	    ap_table_addn(e, "CONTENT_LENGTH", hdrs[i].val);
	}
	/*
	 * You really don't want to disable this check, since it leaves you
	 * wide open to CGIs stealing passwords and people viewing them
	 * in the environment with "ps -e".  But, if you must...
	 */
#ifndef SECURITY_HOLE_PASS_AUTHORIZATION
	else if (!strcasecmp(hdrs[i].key, "Authorization") 
		 || !strcasecmp(hdrs[i].key, "Proxy-Authorization")) {
	    continue;
	}
#endif
	else {
	    ap_table_addn(e, http2env(r->pool, hdrs[i].key), hdrs[i].val);
	}
    }

    if (!(env_path = ap_pstrdup(r->pool, getenv("PATH")))) {
	env_path = DEFAULT_PATH;
    }

#ifdef WIN32
    if (env_temp = getenv("SystemRoot")) {
        ap_table_addn(e, "SystemRoot", env_temp);         
    }
    if (env_temp = getenv("COMSPEC")) {
        ap_table_addn(e, "COMSPEC", env_temp);            
    }
    if (env_temp = getenv("WINDIR")) {
        ap_table_addn(e, "WINDIR", env_temp);
    }
#endif

#ifdef OS2
    if ((env_temp = getenv("COMSPEC")) != NULL) {
        ap_table_addn(e, "COMSPEC", env_temp);            
    }
    if ((env_temp = getenv("ETC")) != NULL) {
        ap_table_addn(e, "ETC", env_temp);            
    }
    if ((env_temp = getenv("DPATH")) != NULL) {
        ap_table_addn(e, "DPATH", env_temp);            
    }
    if ((env_temp = getenv("PERLLIB_PREFIX")) != NULL) {
        ap_table_addn(e, "PERLLIB_PREFIX", env_temp);            
    }
#endif

    ap_table_addn(e, "PATH", env_path);
    ap_table_addn(e, "SERVER_SIGNATURE", ap_psignature("", r));
    ap_table_addn(e, "SERVER_SOFTWARE", ap_get_server_version());
    ap_table_addn(e, "SERVER_NAME", 
		  ap_escape_html(r->pool,ap_get_server_name(r)));
    ap_table_addn(e, "SERVER_ADDR", r->connection->local_ip);	/* Apache */
    ap_table_addn(e, "SERVER_PORT",
		  ap_psprintf(r->pool, "%u", ap_get_server_port(r)));
    host = ap_get_remote_host(c, r->per_dir_config, REMOTE_HOST);
    if (host) {
	ap_table_addn(e, "REMOTE_HOST", host);
    }
    ap_table_addn(e, "REMOTE_ADDR", c->remote_ip);
    ap_table_addn(e, "DOCUMENT_ROOT", ap_document_root(r));	/* Apache */
    ap_table_addn(e, "SERVER_ADMIN", s->server_admin);	/* Apache */
    ap_table_addn(e, "SCRIPT_FILENAME", r->filename);	/* Apache */

    ap_table_addn(e, "REMOTE_PORT",
		  ap_psprintf(r->pool, "%d", ntohs(c->remote_addr.sin_port)));

    if (c->user) {
	ap_table_addn(e, "REMOTE_USER", c->user);
    }
    if (c->ap_auth_type) {
	ap_table_addn(e, "AUTH_TYPE", c->ap_auth_type);
    }
    rem_logname = ap_get_remote_logname(r);
    if (rem_logname) {
	ap_table_addn(e, "REMOTE_IDENT", ap_pstrdup(r->pool, rem_logname));
    }

    /* Apache custom error responses. If we have redirected set two new vars */

    if (r->prev) {
        if (r->prev->args) {
	    ap_table_addn(e, "REDIRECT_QUERY_STRING", r->prev->args);
	}
	if (r->prev->uri) {
	    ap_table_addn(e, "REDIRECT_URL", r->prev->uri);
	}
    }

    ap_overlap_tables(r->subprocess_env, e, AP_OVERLAP_TABLES_SET);
}

/* This "cute" little function comes about because the path info on
 * filenames and URLs aren't always the same. So we take the two,
 * and find as much of the two that match as possible.
 */

API_EXPORT(int) ap_find_path_info(const char *uri, const char *path_info)
{
    int lu = strlen(uri);
    int lp = strlen(path_info);

    while (lu-- && lp-- && uri[lu] == path_info[lp]);

    if (lu == -1) {
	lu = 0;
    }

    while (uri[lu] != '\0' && uri[lu] != '/') {
        lu++;
    }
    return lu;
}

/* Obtain the Request-URI from the original request-line, returning
 * a new string from the request pool containing the URI or "".
 */
static char *original_uri(request_rec *r)
{
    char *first, *last;

    if (r->the_request == NULL) {
	return (char *) ap_pcalloc(r->pool, 1);
    }

    first = r->the_request;	/* use the request-line */

    while (*first && !ap_isspace(*first)) {
	++first;		/* skip over the method */
    }
    while (ap_isspace(*first)) {
	++first;		/*   and the space(s)   */
    }

    last = first;
    while (*last && !ap_isspace(*last)) {
	++last;			/* end at next whitespace */
    }

    return ap_pstrndup(r->pool, first, last - first);
}

API_EXPORT(void) ap_add_cgi_vars(request_rec *r)
{
    table *e = r->subprocess_env;

    ap_table_setn(e, "GATEWAY_INTERFACE", "CGI/1.1");
    ap_table_setn(e, "SERVER_PROTOCOL", r->protocol);
    ap_table_setn(e, "REQUEST_METHOD", r->method);
    ap_table_setn(e, "QUERY_STRING", r->args ? r->args : "");
    ap_table_setn(e, "REQUEST_URI", original_uri(r));

    /* Note that the code below special-cases scripts run from includes,
     * because it "knows" that the sub_request has been hacked to have the
     * args and path_info of the original request, and not any that may have
     * come with the script URI in the include command.  Ugh.
     */

    if (!strcmp(r->protocol, "INCLUDED")) {
	ap_table_setn(e, "SCRIPT_NAME", r->uri);
	if (r->path_info && *r->path_info) {
	    ap_table_setn(e, "PATH_INFO", r->path_info);
	}
    }
    else if (!r->path_info || !*r->path_info) {
	ap_table_setn(e, "SCRIPT_NAME", r->uri);
    }
    else {
	int path_info_start = ap_find_path_info(r->uri, r->path_info);

	ap_table_setn(e, "SCRIPT_NAME",
		      ap_pstrndup(r->pool, r->uri, path_info_start));

	ap_table_setn(e, "PATH_INFO", r->path_info);
    }

    if (r->path_info && r->path_info[0]) {
	/*
	 * To get PATH_TRANSLATED, treat PATH_INFO as a URI path.
	 * Need to re-escape it for this, since the entire URI was
	 * un-escaped before we determined where the PATH_INFO began.
	 */
	request_rec *pa_req;

	pa_req = ap_sub_req_lookup_uri(ap_escape_uri(r->pool, r->path_info), r);

	if (pa_req->filename) {
#ifdef WIN32
	    char buffer[HUGE_STRING_LEN];
#endif
	    char *pt = ap_pstrcat(r->pool, pa_req->filename, pa_req->path_info,
				  NULL);
#ifdef WIN32
	    /* We need to make this a real Windows path name */
	    GetFullPathName(pt, HUGE_STRING_LEN, buffer, NULL);
	    ap_table_setn(e, "PATH_TRANSLATED", ap_pstrdup(r->pool, buffer));
#else
	    ap_table_setn(e, "PATH_TRANSLATED", pt);
#endif
	}
	ap_destroy_sub_req(pa_req);
    }
}


static int set_cookie_doo_doo(void *v, const char *key, const char *val)
{
    ap_table_addn(v, key, val);
    return 1;
}

API_EXPORT(int) ap_scan_script_header_err_core(request_rec *r, char *buffer,
				       int (*getsfunc) (char *, int, void *),
				       void *getsfunc_data)
{
    char x[MAX_STRING_LEN];
    char *w, *l;
    int p;
    int cgi_status = HTTP_OK;
    table *merge;
    table *cookie_table;

    if (buffer) {
	*buffer = '\0';
    }
    w = buffer ? buffer : x;

    ap_hard_timeout("read script header", r);

    /* temporary place to hold headers to merge in later */
    merge = ap_make_table(r->pool, 10);

    /* The HTTP specification says that it is legal to merge duplicate
     * headers into one.  Some browsers that support Cookies don't like
     * merged headers and prefer that each Set-Cookie header is sent
     * separately.  Lets humour those browsers by not merging.
     * Oh what a pain it is.
     */
    cookie_table = ap_make_table(r->pool, 2);
    ap_table_do(set_cookie_doo_doo, cookie_table, r->err_headers_out, "Set-Cookie", NULL);

    while (1) {

	if ((*getsfunc) (w, MAX_STRING_LEN - 1, getsfunc_data) == 0) {
	    ap_kill_timeout(r);
	    ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
			  "Premature end of script headers: %s", r->filename);
	    return HTTP_INTERNAL_SERVER_ERROR;
	}

	/* Delete terminal (CR?)LF */

	p = strlen(w);
        /* Indeed, the host's '\n':
           '\012' for UNIX; '\015' for MacOS; '\025' for OS/390
           -- whatever the script generates.
        */
	if (p > 0 && w[p - 1] == '\n') {
	    if (p > 1 && w[p - 2] == CR) {
		w[p - 2] = '\0';
	    }
	    else {
		w[p - 1] = '\0';
	    }
	}

	/*
	 * If we've finished reading the headers, check to make sure any
	 * HTTP/1.1 conditions are met.  If so, we're done; normal processing
	 * will handle the script's output.  If not, just return the error.
	 * The appropriate thing to do would be to send the script process a
	 * SIGPIPE to let it know we're ignoring it, close the channel to the
	 * script process, and *then* return the failed-to-meet-condition
	 * error.  Otherwise we'd be waiting for the script to finish
	 * blithering before telling the client the output was no good.
	 * However, we don't have the information to do that, so we have to
	 * leave it to an upper layer.
	 */
	if (w[0] == '\0') {
	    int cond_status = OK;

	    ap_kill_timeout(r);
	    if ((cgi_status == HTTP_OK) && (r->method_number == M_GET)) {
		cond_status = ap_meets_conditions(r);
	    }
	    ap_overlap_tables(r->err_headers_out, merge,
		AP_OVERLAP_TABLES_MERGE);
	    if (!ap_is_empty_table(cookie_table)) {
		/* the cookies have already been copied to the cookie_table */
		ap_table_unset(r->err_headers_out, "Set-Cookie");
		r->err_headers_out = ap_overlay_tables(r->pool,
		    r->err_headers_out, cookie_table);
	    }
	    return cond_status;
	}

	/* if we see a bogus header don't ignore it. Shout and scream */

#ifdef CHARSET_EBCDIC
	    /* Chances are that we received an ASCII header text instead of
	     * the expected EBCDIC header lines. Try to auto-detect:
	     */
	if (!(l = strchr(w, ':'))) {
	    int maybeASCII = 0, maybeEBCDIC = 0;
	    char *cp;

	    for (cp = w; *cp != '\0'; ++cp) {
		if (isprint(*cp) && !isprint(os_toebcdic[*cp]))
		    ++maybeEBCDIC;
		if (!isprint(*cp) && isprint(os_toebcdic[*cp]))
		    ++maybeASCII;
		}
	    if (maybeASCII > maybeEBCDIC) {
		ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r->server,
			 "CGI Interface Error: Script headers apparently ASCII: (CGI = %s)", r->filename);
		ascii2ebcdic(w, w, cp - w);
	    }
	}
#endif
	if (!(l = strchr(w, ':'))) {
	    char malformed[(sizeof MALFORMED_MESSAGE) + 1
			   + MALFORMED_HEADER_LENGTH_TO_SHOW];

	    strcpy(malformed, MALFORMED_MESSAGE);
	    strncat(malformed, w, MALFORMED_HEADER_LENGTH_TO_SHOW);

	    if (!buffer) {
		/* Soak up all the script output - may save an outright kill */
	        while ((*getsfunc) (w, MAX_STRING_LEN - 1, getsfunc_data)) {
		    continue;
		}
	    }

	    ap_kill_timeout(r);
	    ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
			  "%s: %s", malformed, r->filename);
	    return HTTP_INTERNAL_SERVER_ERROR;
	}

	*l++ = '\0';
	while (*l && ap_isspace(*l)) {
	    ++l;
	}

	if (!strcasecmp(w, "Content-type")) {
	    char *tmp;

	    /* Nuke trailing whitespace */

	    char *endp = l + strlen(l) - 1;
	    while (endp > l && ap_isspace(*endp)) {
		*endp-- = '\0';
	    }

	    tmp = ap_pstrdup(r->pool, l);
	    ap_content_type_tolower(tmp);
	    r->content_type = tmp;
	}
	/*
	 * If the script returned a specific status, that's what
	 * we'll use - otherwise we assume 200 OK.
	 */
	else if (!strcasecmp(w, "Status")) {
	    r->status = cgi_status = atoi(l);
	    r->status_line = ap_pstrdup(r->pool, l);
	}
	else if (!strcasecmp(w, "Location")) {
	    ap_table_set(r->headers_out, w, l);
	}
	else if (!strcasecmp(w, "Content-Length")) {
	    ap_table_set(r->headers_out, w, l);
	}
	else if (!strcasecmp(w, "Transfer-Encoding")) {
	    ap_table_set(r->headers_out, w, l);
	}
	/*
	 * If the script gave us a Last-Modified header, we can't just
	 * pass it on blindly because of restrictions on future values.
	 */
	else if (!strcasecmp(w, "Last-Modified")) {
	    time_t mtime = ap_parseHTTPdate(l);

	    ap_update_mtime(r, mtime);
	    ap_set_last_modified(r);
	}
	else if (!strcasecmp(w, "Set-Cookie")) {
	    ap_table_add(cookie_table, w, l);
	}
	else {
	    ap_table_add(merge, w, l);
	}
    }
}

static int getsfunc_FILE(char *buf, int len, void *f)
{
    return fgets(buf, len, (FILE *) f) != NULL;
}

API_EXPORT(int) ap_scan_script_header_err(request_rec *r, FILE *f,
					  char *buffer)
{
    return ap_scan_script_header_err_core(r, buffer, getsfunc_FILE, f);
}

static int getsfunc_BUFF(char *w, int len, void *fb)
{
    return ap_bgets(w, len, (BUFF *) fb) > 0;
}

API_EXPORT(int) ap_scan_script_header_err_buff(request_rec *r, BUFF *fb,
					       char *buffer)
{
    return ap_scan_script_header_err_core(r, buffer, getsfunc_BUFF, fb);
}

struct vastrs {
    va_list args;
    int arg;
    const char *curpos;
};

static int getsfunc_STRING(char *w, int len, void *pvastrs)
{
    struct vastrs *strs = (struct vastrs*) pvastrs;
    char *p;
    int t;
    
    if (!strs->curpos || !*strs->curpos) 
        return 0;
    p = strchr(strs->curpos, '\n');
    if (p)
        ++p;
    else
        p = strchr(strs->curpos, '\0');
    t = p - strs->curpos;
    if (t > len)
        t = len;
    strncpy (w, strs->curpos, t);
    w[t] = '\0';
    if (!strs->curpos[t]) {
        ++strs->arg;
        strs->curpos = va_arg(strs->args, const char *);
    }
    else
        strs->curpos += t;
    return t;    
}

/* ap_scan_script_header_err_strs() accepts additional const char* args...
 * each is treated as one or more header lines, and the first non-header
 * character is returned to **arg, **data.  (The first optional arg is
 * counted as 0.)
 */
API_EXPORT_NONSTD(int) ap_scan_script_header_err_strs(request_rec *r, 
                                                      char *buffer, 
                                                      const char **termch,
                                                      int *termarg, ...)
{
    struct vastrs strs;
    int res;

    va_start(strs.args, termarg);
    strs.arg = 0;
    strs.curpos = va_arg(strs.args, char*);
    res = ap_scan_script_header_err_core(r, buffer, getsfunc_STRING, (void *) &strs);
    if (termch)
        *termch = strs.curpos;
    if (termarg)
        *termarg = strs.arg;
    va_end(strs.args);
    return res;
}

API_EXPORT(void) ap_send_size(size_t size, request_rec *r)
{
    /* XXX: this -1 thing is a gross hack */
    if (size == (size_t)-1) {
	ap_rputs("    -", r);
    }
    else if (!size) {
	ap_rputs("   0k", r);
    }
    else if (size < 1024) {
	ap_rputs("   1k", r);
    }
    else if (size < 1048576) {
	ap_rprintf(r, "%4dk", (int)((size + 512) / 1024));
    }
    else if (size < 103809024) {
	ap_rprintf(r, "%4.1fM", size / 1048576.0);
    }
    else {
	ap_rprintf(r, "%4dM", (int)((size + 524288) / 1048576));
    }
}

API_EXPORT(int) ap_call_exec(request_rec *r, child_info *pinfo, char *argv0,
			     char **env, int shellcmd)
{
    int pid = 0;
    core_dir_config *conf;
    conf = (core_dir_config *) ap_get_module_config(r->per_dir_config,
						    &core_module);

#if !defined(WIN32) && !defined(OS2)
    /* the fd on r->server->error_log is closed, but we need somewhere to
     * put the error messages from the log_* functions. So, we use stderr,
     * since that is better than allowing errors to go unnoticed.  Don't do
     * this on Win32, though, since we haven't fork()'d.
     */
    r->server->error_log = stderr;
#endif

#ifdef RLIMIT_CPU
    if (conf->limit_cpu != NULL) {
        if ((setrlimit(RLIMIT_CPU, conf->limit_cpu)) != 0) {
	    ap_log_error(APLOG_MARK, APLOG_ERR, r->server,
			 "setrlimit: failed to set CPU usage limit");
	}
    }
#endif
#ifdef RLIMIT_NPROC
    if (conf->limit_nproc != NULL) {
        if ((setrlimit(RLIMIT_NPROC, conf->limit_nproc)) != 0) {
	    ap_log_error(APLOG_MARK, APLOG_ERR, r->server,
			 "setrlimit: failed to set process limit");
	}
    }
#endif
#if defined(RLIMIT_AS)
    if (conf->limit_mem != NULL) {
        if ((setrlimit(RLIMIT_AS, conf->limit_mem)) != 0) {
	    ap_log_error(APLOG_MARK, APLOG_ERR, r->server,
			 "setrlimit(RLIMIT_AS): failed to set memory "
			 "usage limit");
	}
    }
#elif defined(RLIMIT_DATA)
    if (conf->limit_mem != NULL) {
        if ((setrlimit(RLIMIT_DATA, conf->limit_mem)) != 0) {
	    ap_log_error(APLOG_MARK, APLOG_ERR, r->server,
			 "setrlimit(RLIMIT_DATA): failed to set memory "
			 "usage limit");
	}
    }
#elif defined(RLIMIT_VMEM)
    if (conf->limit_mem != NULL) {
        if ((setrlimit(RLIMIT_VMEM, conf->limit_mem)) != 0) {
	    ap_log_error(APLOG_MARK, APLOG_ERR, r->server,
			 "setrlimit(RLIMIT_VMEM): failed to set memory "
			 "usage limit");
	}
    }
#endif

#ifdef OS2
    {
	/* Additions by Alec Kloss, to allow exec'ing of scripts under OS/2 */
	int is_script = 0;
	char interpreter[2048];	/* hope it's enough for the interpreter path */
	char error_object[260];
	FILE *program;
        char *cmdline = r->filename, *cmdline_pos;
        int cmdlen;
	char *args = "", *args_end;
	ULONG rc;
        RESULTCODES rescodes;
        int env_len, e;
        char *env_block, *env_block_pos;

	if ((conf->cgi_command_args != AP_FLAG_OFF)
            && r->args && r->args[0]
            && !strchr(r->args, '=')) {
	    args = r->args;
        }
	    
	program = fopen(r->filename, "rt");
	
	if (!program) {
	    ap_log_rerror(APLOG_MARK, APLOG_ERR, r, "fopen(%s) failed",
			 r->filename);
	    return (pid);
	}
	
	fgets(interpreter, sizeof(interpreter), program);
	fclose(program);
	
	if (!strncmp(interpreter, "#!", 2)) {
	    is_script = 1;
            interpreter[strlen(interpreter) - 1] = '\0';
            if (interpreter[2] != '/' && interpreter[2] != '\\' && interpreter[3] != ':') {
                char buffer[300];
                if (DosSearchPath(SEARCH_ENVIRONMENT, "PATH", interpreter+2, buffer, sizeof(buffer)) == 0) {
                    strcpy(interpreter+2, buffer);
                } else {
                    strcat(interpreter, ".exe");
                    if (DosSearchPath(SEARCH_ENVIRONMENT, "PATH", interpreter+2, buffer, sizeof(buffer)) == 0) {
                        strcpy(interpreter+2, buffer);
                    }
                }
            }
	}

        if (is_script) {
            cmdline = ap_pstrcat(r->pool, interpreter+2, " ", r->filename, NULL);
        }
        else if (strstr(strupr(r->filename), ".CMD") > 0) {
            /* Special case to allow use of REXX commands as scripts. */
            os2pathname(r->filename);
            cmdline = ap_pstrcat(r->pool, SHELL_PATH, " /C ", r->filename, NULL);
        }
        else {
            cmdline = r->filename;
	}
	
        args = ap_pstrdup(r->pool, args);
        ap_unescape_url(args);
        args = ap_double_quotes(r->pool, args);
        args_end = args + strlen(args);

        if (args_end - args > 4000) { /* cmd.exe won't handle lines longer than 4k */
            args_end = args + 4000;
            *args_end = 0;
        }

        /* +4 = 1 space between progname and args, 2 for double null at end, 2 for possible quote on first arg */
        cmdlen = strlen(cmdline) + strlen(args) + 4; 
        cmdline_pos = cmdline;

        while (*cmdline_pos) {
            cmdlen += 2 * (*cmdline_pos == '+');  /* Allow space for each arg to be quoted */
            cmdline_pos++;
        }

        cmdline = ap_pstrndup(r->pool, cmdline, cmdlen);
        cmdline_pos = cmdline + strlen(cmdline);

	while (args < args_end) {
            char *arg;
	    
            arg = ap_getword_nc(r->pool, &args, '+');

            if (strpbrk(arg, "&|<> "))
                arg = ap_pstrcat(r->pool, "\"", arg, "\"", NULL);

            *(cmdline_pos++) = ' ';
            strcpy(cmdline_pos, arg);
            cmdline_pos += strlen(cmdline_pos);
        }

        *(++cmdline_pos) = 0; /* Add required second terminator */
	args = strchr(cmdline, ' ');
	
	if (args) {
	    *args = 0;
	    args++;
	}

        /* Create environment block from list of envariables */
        for (env_len=1, e=0; env[e]; e++)
            env_len += strlen(env[e]) + 1;

        env_block = ap_palloc(r->pool, env_len);
        env_block_pos = env_block;

        for (e=0; env[e]; e++) {
            strcpy(env_block_pos, env[e]);
            env_block_pos += strlen(env_block_pos) + 1;
        }

        *env_block_pos = 0; /* environment block is terminated by a double null */

	rc = DosExecPgm(error_object, sizeof(error_object), EXEC_ASYNC, cmdline, env_block, &rescodes, cmdline);
	
	if (rc) {
            ap_log_rerror(APLOG_MARK, APLOG_ERR, r, "DosExecPgm(%s %s) failed, %s - %s",
                          cmdline, args ? args : "", ap_os_error_message(rc), error_object );
	    return -1;
	}
	
	return rescodes.codeTerminate;
    }
#elif defined(WIN32)
    {
        /* Adapted from Alec Kloss' work for OS/2 */
        char *interpreter = NULL;
        char *invokename = NULL;
        char *arguments = NULL;
        char *ext = NULL;
        char *s = NULL;
        char *t = NULL;
        char *pCommand;
        char *pEnvBlock, *pNext;

        int i;
        int iEnvBlockLen;

        file_type_e fileType;

        STARTUPINFO si;
        PROCESS_INFORMATION pi;

        memset(&si, 0, sizeof(si));
        memset(&pi, 0, sizeof(pi));

        pid = -1;

        if (!shellcmd) {

            fileType = ap_get_win32_interpreter(r, &interpreter);

            if (fileType == eFileTypeUNKNOWN) {
                ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, r,
                              "%s is not executable; ensure interpreted scripts have "
                              "\"#!\" first line", 
                              r->filename);
                return (pid);
            }

            if (interpreter && *interpreter 
                    && (s = strstr(interpreter, "\"%1\""))) {
                s[1] = '\0';
                s += 3;
                invokename = ap_pstrdup(r->pool, r->filename);
            }
            else
            {
                char shortname[MAX_PATH];
                DWORD rv = GetShortPathName(r->filename, shortname, MAX_PATH);
                if (!rv || rv >= MAX_PATH) {
                    ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, r,
                                  "%s is not executable; cannot translate "
                                  "to a short path name.", r->filename);
                    return (pid);
                }
                invokename = ap_pstrdup(r->pool, shortname);

                if (interpreter && *interpreter
                        && (s = strstr(interpreter, "%1"))) {
                    s[0] = '\0';
                    s += 2;
                }
            }
            for (t = invokename; *t; ++t) {
                if (*t == '/')
                    *t = '\\';
            }

            /*
             * Look at the arguments...
             */
            arguments = "";
            if ((conf->cgi_command_args != AP_FLAG_OFF)
                 && (r->args) && (r->args[0])
                 && !strchr(r->args, '=')) { 
                /* If we are in this leg, there are some other arguments
                 * that we must include in the execution of the CGI.
                 * Because CreateProcess is the way it is, we have to
                 * create a command line like format for the execution
                 * of the CGI.  This means we need to create on long
                 * string with the executable and arguments.
                 *
                 * The arguments string comes in the request structure,
                 * and each argument is separated by a '+'.  We'll replace
                 * these pluses with spaces.
                 */

                int iStringSize = 0;
                int x;
	    
                /*
                 *  Duplicate the request structure string so we don't change it.
                 */                                   
                arguments = ap_pstrdup(r->pool, r->args);
                
                /*
                 *  Change the '+' to ' '
                 */
                for (x=0; arguments[x]; x++) {
                    if ('+' == arguments[x]) {
                        arguments[x] = ' ';
                    }
                }
       
                /*
                 * We need to unescape any characters that are 
                 * in the arguments list.  Truncate to 4000
                 * characters for safety, being careful of the
                 * now-escaped characters.
                 */
                ap_unescape_url(arguments);
                arguments = ap_escape_shell_cmd(r->pool, arguments);
                if (strlen(arguments) > 4000)
                {
                    int len = 4000;
                    while (len && arguments[len - 1] == '\\') {
                        --len;
                    }
                    arguments[len] = '\0';
                }

                /*
                 * Now that the arguments list is 'shell' escaped with
                 * backslashes, we need to make cmd.exe/command.com 
                 * safe from this same set of characters.
                 */
                if (fileType == eCommandShell32) {
                    arguments = ap_caret_escape_args(r->pool, arguments);
                }
                else if (fileType == eCommandShell16) {
                    arguments = ap_pstrcat(r->pool, "\"", 
                            ap_double_quotes(r->pool, arguments), "\"", NULL);
                }
            }

            /*
             * The remaining code merges the interpreter, the backslashed
             * and potentially shortened invoke name, the various
             * interpreter segments and the arguments.
             *
             * Note that interpreter started out with %1 %* arguments,
             * so the *t character skips the %* arguments list, and the
             * *s already skipped the %1 argument (quoted or not.)
             */

            if (s && (t = strstr(s, "%*"))) {
                /* interpreter formatted: prog [opts] %1 [opts] %* [opts] 
                 */
                t[0] = '\0';
                t += 2;
                pCommand = ap_pstrcat(r->pool, interpreter, invokename,
                                               s, arguments, t, NULL);
            }
            else if (s) {
                /* interpreter formatted: prog [opts] %1 [opts] 
                 */
                pCommand = ap_pstrcat(r->pool, interpreter, invokename,
                                               s, " ", arguments, NULL);
            }
            else if (interpreter) {
                /* interpreter formatted: prog [opts]
                 */
                pCommand = ap_pstrcat(r->pool, interpreter, " ", invokename,
                                               " ", arguments, NULL);
            }
            else {
                /* no interpreter required
                 */
                pCommand = ap_pstrcat(r->pool, invokename, 
                                               " ", arguments, NULL);
            }

        }
        else /* shellcmd */
        {
            char *p, *comspec = getenv("COMSPEC");
            const char *quotecomspec;
            const char *quoteargv0;
            if (!comspec)
                comspec = SHELL_PATH;
            p = strchr(comspec, '\0');
            quotecomspec = (strchr(comspec, ' ') && comspec[0] != '\"')
                         ? "\"" : "";
            quoteargv0 = (strchr(argv0, ' ') && argv0[0] != '\"') ? "\"" : "";
            pCommand = ap_pstrcat(r->pool, quotecomspec, comspec, quotecomspec,
                                  " /c ", quoteargv0, argv0, quoteargv0, NULL);
            /* Forward slash argv[0] only */
            for (p = pCommand + strlen(pCommand) - strlen(argv0) 
                              - strlen(quoteargv0); *p; ++p) {
                if (*p == '/')
                    *p = '\\';
            }
        }

        /*
         * Make child process use hPipeOutputWrite as standard out,
         * and make sure it does not show on screen.
         */
        si.cb = sizeof(si);
        si.dwFlags     = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
        si.wShowWindow = SW_HIDE;
        si.hStdInput   = pinfo->hPipeInputRead;
        si.hStdOutput  = pinfo->hPipeOutputWrite;
        si.hStdError   = pinfo->hPipeErrorWrite;
  
        /*
         * Win32's CreateProcess call requires that the environment
         * be passed in an environment block, a null terminated block of
         * null terminated strings.
         */  
        i = 0;
        iEnvBlockLen = 1;
        while (env[i]) {
            iEnvBlockLen += strlen(env[i]) + 1;
            i++;
        }
  
        pEnvBlock = (char *)ap_pcalloc(r->pool,iEnvBlockLen);
    
        i = 0;
        pNext = pEnvBlock;
        while (env[i]) {
            strcpy(pNext, env[i]);
            pNext = pNext + strlen(pNext) + 1;
            i++;
        }

        ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, r->server,
                     "Invoking CGI Command '%s'", pCommand);
        for (i = 0; env[i]; ++i) {
            ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_DEBUG, r->server,
                         "  CGI env[%d] = '%s'", i, env[i]);
        }

        if (CreateProcess(NULL, pCommand, NULL, NULL, TRUE, 
                          0,
                          pEnvBlock,
                          ap_make_dirstr_parent(r->pool, r->filename),
                          &si, &pi)) {
            if (fileType == eFileTypeEXE16 || fileType == eCommandShell16) {
                /* Hack to get 16-bit CGI's working. It works for all the 
                 * standard modules shipped with Apache. pi.dwProcessId is 0 
                 * for 16-bit CGIs and all the Unix specific code that calls 
                 * ap_call_exec interprets this as a failure case. And we can't 
                 * use -1 either because it is mapped to 0 by the caller.
                 */
                pid = -2;
            }
            else {
                pid = pi.dwProcessId;
                /*
                 * We must close the handles to the new process and its main thread
                 * to prevent handle and memory leaks.
                 */ 
                CloseHandle(pi.hProcess);
                CloseHandle(pi.hThread);
            }
        }
        return (pid);
    }
#elif defined(NETWARE)
#else
    if (ap_suexec_enabled
	&& ((r->server->server_uid != ap_user_id)
	    || (r->server->server_gid != ap_group_id)
	    || (!strncmp("/~", r->uri, 2)))) {

	char *execuser, *grpname;
	struct passwd *pw;
	struct group *gr;

	if (!strncmp("/~", r->uri, 2)) {
	    gid_t user_gid;
	    char *username = ap_pstrdup(r->pool, r->uri + 2);
	    char *pos = strchr(username, '/');

	    if (pos) {
		*pos = '\0';
	    }

	    if ((pw = getpwnam(username)) == NULL) {
		ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
			     "getpwnam: invalid username %s", username);
		return (pid);
	    }
	    execuser = ap_pstrcat(r->pool, "~", pw->pw_name, NULL);
	    user_gid = pw->pw_gid;

	    if ((gr = getgrgid(user_gid)) == NULL) {
	        if ((grpname = ap_palloc(r->pool, 16)) == NULL) {
		    return (pid);
		}
		else {
		    ap_snprintf(grpname, 16, "%ld", (long) user_gid);
		}
	    }
	    else {
		grpname = gr->gr_name;
	    }
	}
	else {
	    if ((pw = getpwuid(r->server->server_uid)) == NULL) {
		ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
			     "getpwuid: invalid userid %ld",
			     (long) r->server->server_uid);
		return (pid);
	    }
	    execuser = ap_pstrdup(r->pool, pw->pw_name);

	    if ((gr = getgrgid(r->server->server_gid)) == NULL) {
		ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
			     "getgrgid: invalid groupid %ld",
			     (long) r->server->server_gid);
		return (pid);
	    }
	    grpname = gr->gr_name;
	}

	if (shellcmd) {
	    execle(SUEXEC_BIN, SUEXEC_BIN, execuser, grpname, argv0,
		   NULL, env);
	}

	else if ((conf->cgi_command_args == AP_FLAG_OFF)
            || (!r->args) || (!r->args[0])
            || strchr(r->args, '=')) {
	    execle(SUEXEC_BIN, SUEXEC_BIN, execuser, grpname, argv0,
		   NULL, env);
	}

	else {
	    execve(SUEXEC_BIN,
		   create_argv(r->pool, SUEXEC_BIN, execuser, grpname,
			       argv0, r->args),
		   env);
	}
    }
    else {
        if (shellcmd) {
	    execle(SHELL_PATH, SHELL_PATH, "-c", argv0, NULL, env);
	}

	else if ((conf->cgi_command_args == AP_FLAG_OFF)
            || (!r->args) || (!r->args[0])
            || strchr(r->args, '=')) {
	    execle(r->filename, argv0, NULL, env);
	}

	else {
	    execve(r->filename,
		   create_argv(r->pool, NULL, NULL, NULL, argv0, r->args),
		   env);
	}
    }
    return (pid);
#endif
}
