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Celestin Apprentice 4
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Apache 1.0
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mod_cgi.c
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1995-12-04
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/* ====================================================================
* Copyright (c) 1995 The Apache Group. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
* 5. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR
* IT'S CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/
/*
* http_script: keeps all script-related ramblings together.
*
* Compliant to CGI/1.1 spec
*
* Adapted by rst from original NCSA code by Rob McCool
*
* Apache adds some new env vars; REDIRECT_URL and REDIRECT_QUERY_STRING for
* custom error responses, and DOCUMENT_ROOT because we found it useful.
* It also adds SERVER_ADMIN - useful for scripts to know who to mail when
* they fail.
*/
#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"
/* 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.
*/
int is_scriptaliased (request_rec *r)
{
char *t = table_get (r->notes, "alias-forced-type");
return t && (!strcmp (t, CGI_MAGIC_TYPE));
}
/****************************************************************
*
* Actual CGI handling...
*/
void add_cgi_vars(request_rec *r)
{
table *e = r->subprocess_env;
table_set (e, "GATEWAY_INTERFACE","CGI/1.1");
table_set (e, "SERVER_PROTOCOL", r->protocol);
table_set (e, "REQUEST_METHOD", r->method);
table_set (e, "QUERY_STRING", r->args ? r->args : "");
/* 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 (!r->path_info || !*r->path_info || !strcmp (r->protocol, "INCLUDED")) {
table_set (e, "SCRIPT_NAME", r->uri);
} else {
int path_info_start = strlen (r->uri) - strlen (r->path_info);
r->uri[path_info_start] = '\0';
table_set (e, "SCRIPT_NAME", r->uri);
r->uri[path_info_start] = '/';
}
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 = sub_req_lookup_uri(
escape_uri(r->pool, r->path_info), r);
table_set (e, "PATH_INFO", r->path_info);
/* Don't bother destroying pa_req --- it's only created in
* child processes which are about to jettison their address
* space anyway. BTW, we concatenate filename and path_info
* from the sub_request to be compatible in case the PATH_INFO
* is pointing to an object which doesn't exist.
*/
if (pa_req->filename)
table_set (e, "PATH_TRANSLATED",
pstrcat (r->pool, pa_req->filename, pa_req->path_info,
NULL));
}
}
struct cgi_child_stuff {
request_rec *r;
int nph;
char *argv0;
};
void cgi_child (void *child_stuff)
{
struct cgi_child_stuff *cld = (struct cgi_child_stuff *)child_stuff;
request_rec *r = cld->r;
char *argv0 = cld->argv0;
int nph = cld->nph;
#ifdef DEBUG_CGI
FILE *dbg = fopen ("/dev/tty", "w");
int i;
#endif
char **env;
char err_string[HUGE_STRING_LEN];
#ifdef DEBUG_CGI
fprintf (dbg, "Attempting to exec %s as %sCGI child (argv0 = %s)\n",
r->filename, nph ? "NPH " : "", argv0);
#endif
add_cgi_vars (r);
env = create_environment (r->pool, r->subprocess_env);
#ifdef DEBUG_CGI
fprintf (dbg, "Environment: \n");
for (i = 0; env[i]; ++i) fprintf (dbg, "'%s'\n", env[i]);
#endif
chdir_file (r->filename);
error_log2stderr (r->server);
if (nph) client_to_stdout (r->connection);
/* Transumute outselves into the script.
* NB only ISINDEX scripts get decoded arguments.
*/
cleanup_for_exec();
if((!r->args) || (!r->args[0]) || (ind(r->args,'=') >= 0))
execle(r->filename, argv0, NULL, env);
else
execve(r->filename, create_argv(r->pool, argv0, r->args), env);
/* Uh oh. Still here. Where's the kaboom? There was supposed to be an
* EARTH-shattering kaboom!
*
* Oh, well. Muddle through as best we can...
*
* (NB we can't use log_error, or anything like that, because we
* just closed the file descriptor which r->server->error_log
* was tied to in cleanup_for_exec(). It's only available on stderr
* now, so that's what we use).
*/
sprintf(err_string,
"exec of %s failed, errno is %d\n", r->filename, errno);
write(2, err_string, strlen(err_string));
exit(0);
}
int cgi_handler (request_rec *r)
{
int nph;
char *argv0;
FILE *script_out, *script_in;
char argsbuffer[HUGE_STRING_LEN];
int is_included = !strcmp (r->protocol, "INCLUDED");
char *lenp = table_get (r->headers_in, "Content-length");
struct cgi_child_stuff cld;
if((argv0 = strrchr(r->filename,'/')) != NULL)
argv0++;
else argv0 = r->filename;
nph = !(strncmp(argv0,"nph-",4));
if (!(allow_options (r) & OPT_EXECCGI) && !is_scriptaliased (r)) {
log_reason("Options ExecCGI is off in this directory", r->filename, r);
return FORBIDDEN;
}
if (nph && is_included) {
log_reason("attempt to include NPH CGI script", r->filename, r);
return FORBIDDEN;
}
if (S_ISDIR(r->finfo.st_mode)) {
log_reason("attempt to invoke directory as script", r->filename, r);
return FORBIDDEN;
}
if (r->finfo.st_mode == 0) {
log_reason("script not found or unable to stat", r->filename, r);
return NOT_FOUND;
}
if(!can_exec(&r->finfo)) {
log_reason("file permissions deny server execution", r->filename, r);
return FORBIDDEN;
}
if ((r->method_number == M_POST || r->method_number == M_PUT)
&& !lenp) {
log_reason("POST or PUT without Content-length:", r->filename, r);
return BAD_REQUEST;
}
add_common_vars (r);
cld.argv0 = argv0; cld.r = r; cld.nph = nph;
if (!spawn_child (r->connection->pool, cgi_child, (void *)&cld,
nph ? just_wait : kill_after_timeout,
&script_out, nph ? NULL : &script_in)) {
log_reason ("couldn't spawn child process", r->filename, r);
return SERVER_ERROR;
}
/* Transfer any put/post args, CERN style...
* Note that if a buggy script fails to read everything we throw
* at it, or a buggy client sends too much, we get a SIGPIPE, so
* we have to ignore SIGPIPE while doing this. CERN does the same
* (and in fact, they pretty nearly guarantee themselves a SIGPIPE
* on every invocation by chasing the real client data with a
* spurious newline).
*/
if (r->method_number == M_POST || r->method_number == M_PUT) {
void (*handler)();
int remaining = atoi (lenp);
hard_timeout ("copy script args", r);
handler = signal (SIGPIPE, SIG_IGN);
while ((remaining > 0))
{
int len_read, len_to_read = remaining;
if (len_to_read > HUGE_STRING_LEN) len_to_read = HUGE_STRING_LEN;
len_read = read_client_block (r, argsbuffer, len_to_read);
fwrite (argsbuffer, 1, len_read, script_out);
remaining -= len_read;
}
fflush (script_out);
signal (SIGPIPE, handler);
kill_timeout (r);
}
pfclose (r->connection->pool, script_out);
/* Handle script return... */
if (script_in && !nph) {
char *location;
int ret;
if ((ret = scan_script_header(r, script_in)))
return ret;
location = table_get (r->headers_out, "Location");
if (location && location[0] == '/' && r->status == 200) {
/* Soak up all the script output */
hard_timeout ("read from script", r);
while (fgets(argsbuffer, HUGE_STRING_LEN-1, script_in) != NULL)
continue;
kill_timeout (r);
internal_redirect (location, r);
return OK;
}
else if (location && r->status == 200) {
/* XX Note that if a script wants to produce its own Redirect
* body, it now has to explicitly *say* "Status: 302"
*/
return REDIRECT;
}
hard_timeout ("send script output", r);
send_http_header(r);
if(!r->header_only) send_fd (script_in, r);
kill_timeout (r);
pfclose (r->connection->pool, script_in);
}
return OK; /* NOT r->status, even if it has changed. */
}
handler_rec cgi_handlers[] = {
{ CGI_MAGIC_TYPE, cgi_handler },
{ NULL }
};
module cgi_module = {
STANDARD_MODULE_STUFF,
NULL, /* initializer */
NULL, /* dir config creater */
NULL, /* dir merger --- default is to override */
NULL, /* server config */
NULL, /* merge server config */
NULL, /* command table */
cgi_handlers, /* handlers */
NULL, /* filename translation */
NULL, /* check_user_id */
NULL, /* check auth */
NULL, /* check access */
NULL, /* type_checker */
NULL, /* fixups */
NULL /* logger */
};