1 /* Copyright 1999-2004 The Apache Software Foundation
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
17 * http_script: keeps all script-related ramblings together.
19 * Compliant to CGI/1.1 spec
21 * Adapted by rst from original NCSA code by Rob McCool
23 * Apache adds some new env vars; REDIRECT_URL and REDIRECT_QUERY_STRING for
24 * custom error responses, and DOCUMENT_ROOT because we found it useful.
25 * It also adds SERVER_ADMIN - useful for scripts to know who to mail when
30 #include "apr_strings.h"
31 #include "apr_thread_proc.h" /* for RLIMIT stuff */
32 #include "apr_optional.h"
33 #include "apr_buckets.h"
37 #define APR_WANT_STRFUNC
38 #define APR_WANT_MEMFUNC
43 #include "util_filter.h"
44 #include "ap_config.h"
46 #include "http_config.h"
47 #include "http_request.h"
48 #include "http_core.h"
49 #include "http_protocol.h"
50 #include "http_main.h"
52 #include "util_script.h"
57 module AP_MODULE_DECLARE_DATA cgi_module;
59 static APR_OPTIONAL_FN_TYPE(ap_register_include_handler) *cgi_pfn_reg_with_ssi;
60 static APR_OPTIONAL_FN_TYPE(ap_ssi_get_tag_and_value) *cgi_pfn_gtv;
61 static APR_OPTIONAL_FN_TYPE(ap_ssi_parse_string) *cgi_pfn_ps;
62 static APR_OPTIONAL_FN_TYPE(ap_cgi_build_command) *cgi_build_command;
64 /* Read and discard the data in the brigade produced by a CGI script */
65 static void discard_script_output(apr_bucket_brigade *bb);
67 /* KLUDGE --- for back-combatibility, we don't have to check ExecCGI
68 * in ScriptAliased directories, which means we need to know if this
69 * request came through ScriptAlias or not... so the Alias module
70 * leaves a note for us.
73 static int is_scriptaliased(request_rec *r)
75 const char *t = apr_table_get(r->notes, "alias-forced-type");
76 return t && (!strcasecmp(t, "cgi-script"));
79 /* Configuration stuff */
81 #define DEFAULT_LOGBYTES 10385760
82 #define DEFAULT_BUFBYTES 1024
90 static void *create_cgi_config(apr_pool_t *p, server_rec *s)
93 (cgi_server_conf *) apr_pcalloc(p, sizeof(cgi_server_conf));
96 c->logbytes = DEFAULT_LOGBYTES;
97 c->bufbytes = DEFAULT_BUFBYTES;
102 static void *merge_cgi_config(apr_pool_t *p, void *basev, void *overridesv)
104 cgi_server_conf *base = (cgi_server_conf *) basev,
105 *overrides = (cgi_server_conf *) overridesv;
107 return overrides->logname ? overrides : base;
110 static const char *set_scriptlog(cmd_parms *cmd, void *dummy, const char *arg)
112 server_rec *s = cmd->server;
113 cgi_server_conf *conf = ap_get_module_config(s->module_config,
116 conf->logname = ap_server_root_relative(cmd->pool, arg);
118 if (!conf->logname) {
119 return apr_pstrcat(cmd->pool, "Invalid ScriptLog path ",
126 static const char *set_scriptlog_length(cmd_parms *cmd, void *dummy,
129 server_rec *s = cmd->server;
130 cgi_server_conf *conf = ap_get_module_config(s->module_config,
133 conf->logbytes = atol(arg);
137 static const char *set_scriptlog_buffer(cmd_parms *cmd, void *dummy,
140 server_rec *s = cmd->server;
141 cgi_server_conf *conf = ap_get_module_config(s->module_config,
144 conf->bufbytes = atoi(arg);
148 static const command_rec cgi_cmds[] =
150 AP_INIT_TAKE1("ScriptLog", set_scriptlog, NULL, RSRC_CONF,
151 "the name of a log for script debugging info"),
152 AP_INIT_TAKE1("ScriptLogLength", set_scriptlog_length, NULL, RSRC_CONF,
153 "the maximum length (in bytes) of the script debug log"),
154 AP_INIT_TAKE1("ScriptLogBuffer", set_scriptlog_buffer, NULL, RSRC_CONF,
155 "the maximum size (in bytes) to record of a POST request"),
159 static int log_scripterror(request_rec *r, cgi_server_conf * conf, int ret,
160 apr_status_t rv, char *error)
162 apr_file_t *f = NULL;
164 char time_str[APR_CTIME_LEN];
165 int log_flags = rv ? APLOG_ERR : APLOG_ERR;
167 ap_log_rerror(APLOG_MARK, log_flags, rv, r,
168 "%s: %s", error, r->filename);
170 /* XXX Very expensive mainline case! Open, then getfileinfo! */
171 if (!conf->logname ||
172 ((apr_stat(&finfo, conf->logname,
173 APR_FINFO_SIZE, r->pool) == APR_SUCCESS) &&
174 (finfo.size > conf->logbytes)) ||
175 (apr_file_open(&f, conf->logname,
176 APR_APPEND|APR_WRITE|APR_CREATE, APR_OS_DEFAULT,
177 r->pool) != APR_SUCCESS)) {
181 /* "%% [Wed Jun 19 10:53:21 1996] GET /cgi-bin/printenv HTTP/1.0" */
182 apr_ctime(time_str, apr_time_now());
183 apr_file_printf(f, "%%%% [%s] %s %s%s%s %s\n", time_str, r->method, r->uri,
184 r->args ? "?" : "", r->args ? r->args : "", r->protocol);
185 /* "%% 500 /usr/local/apache/cgi-bin */
186 apr_file_printf(f, "%%%% %d %s\n", ret, r->filename);
188 apr_file_printf(f, "%%error\n%s\n", error);
194 /* Soak up stderr from a script and redirect it to the error log.
196 static apr_status_t log_script_err(request_rec *r, apr_file_t *script_err)
198 char argsbuffer[HUGE_STRING_LEN];
202 while ((rv = apr_file_gets(argsbuffer, HUGE_STRING_LEN,
203 script_err)) == APR_SUCCESS) {
204 newline = strchr(argsbuffer, '\n');
208 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
215 static int log_script(request_rec *r, cgi_server_conf * conf, int ret,
216 char *dbuf, const char *sbuf, apr_bucket_brigade *bb,
217 apr_file_t *script_err)
219 const apr_array_header_t *hdrs_arr = apr_table_elts(r->headers_in);
220 const apr_table_entry_t *hdrs = (const apr_table_entry_t *) hdrs_arr->elts;
221 char argsbuffer[HUGE_STRING_LEN];
222 apr_file_t *f = NULL;
230 char time_str[APR_CTIME_LEN];
232 /* XXX Very expensive mainline case! Open, then getfileinfo! */
233 if (!conf->logname ||
234 ((apr_stat(&finfo, conf->logname,
235 APR_FINFO_SIZE, r->pool) == APR_SUCCESS) &&
236 (finfo.size > conf->logbytes)) ||
237 (apr_file_open(&f, conf->logname,
238 APR_APPEND|APR_WRITE|APR_CREATE, APR_OS_DEFAULT,
239 r->pool) != APR_SUCCESS)) {
240 /* Soak up script output */
241 discard_script_output(bb);
242 log_script_err(r, script_err);
246 /* "%% [Wed Jun 19 10:53:21 1996] GET /cgi-bin/printenv HTTP/1.0" */
247 apr_ctime(time_str, apr_time_now());
248 apr_file_printf(f, "%%%% [%s] %s %s%s%s %s\n", time_str, r->method, r->uri,
249 r->args ? "?" : "", r->args ? r->args : "", r->protocol);
250 /* "%% 500 /usr/local/apache/cgi-bin" */
251 apr_file_printf(f, "%%%% %d %s\n", ret, r->filename);
253 apr_file_puts("%request\n", f);
254 for (i = 0; i < hdrs_arr->nelts; ++i) {
257 apr_file_printf(f, "%s: %s\n", hdrs[i].key, hdrs[i].val);
259 if ((r->method_number == M_POST || r->method_number == M_PUT) &&
261 apr_file_printf(f, "\n%s\n", dbuf);
264 apr_file_puts("%response\n", f);
265 hdrs_arr = apr_table_elts(r->err_headers_out);
266 hdrs = (const apr_table_entry_t *) hdrs_arr->elts;
268 for (i = 0; i < hdrs_arr->nelts; ++i) {
271 apr_file_printf(f, "%s: %s\n", hdrs[i].key, hdrs[i].val);
275 apr_file_printf(f, "%s\n", sbuf);
278 for (e = APR_BRIGADE_FIRST(bb);
279 e != APR_BRIGADE_SENTINEL(bb);
280 e = APR_BUCKET_NEXT(e))
282 if (APR_BUCKET_IS_EOS(e)) {
285 rv = apr_bucket_read(e, &buf, &len, APR_BLOCK_READ);
286 if (rv != APR_SUCCESS || (len == 0)) {
290 apr_file_puts("%stdout\n", f);
293 apr_file_write(f, buf, &len);
294 apr_file_puts("\n", f);
297 if (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_err) == APR_SUCCESS) {
298 apr_file_puts("%stderr\n", f);
299 apr_file_puts(argsbuffer, f);
300 while (apr_file_gets(argsbuffer, HUGE_STRING_LEN,
301 script_err) == APR_SUCCESS) {
302 apr_file_puts(argsbuffer, f);
304 apr_file_puts("\n", f);
307 apr_brigade_destroy(bb);
308 apr_file_close(script_err);
315 /* This is the special environment used for running the "exec cmd="
316 * variety of SSI directives.
318 static void add_ssi_vars(request_rec *r)
320 apr_table_t *e = r->subprocess_env;
322 if (r->path_info && r->path_info[0] != '\0') {
325 apr_table_setn(e, "PATH_INFO", ap_escape_shell_cmd(r->pool,
328 pa_req = ap_sub_req_lookup_uri(ap_escape_uri(r->pool, r->path_info),
330 if (pa_req->filename) {
331 apr_table_setn(e, "PATH_TRANSLATED",
332 apr_pstrcat(r->pool, pa_req->filename,
333 pa_req->path_info, NULL));
335 ap_destroy_sub_req(pa_req);
339 char *arg_copy = apr_pstrdup(r->pool, r->args);
341 apr_table_setn(e, "QUERY_STRING", r->args);
342 ap_unescape_url(arg_copy);
343 apr_table_setn(e, "QUERY_STRING_UNESCAPED",
344 ap_escape_shell_cmd(r->pool, arg_copy));
348 static void cgi_child_errfn(apr_pool_t *pool, apr_status_t err,
349 const char *description)
351 apr_file_t *stderr_log;
354 apr_file_open_stderr(&stderr_log, pool);
355 /* Escape the logged string because it may be something that
356 * came in over the network.
358 apr_file_printf(stderr_log,
361 apr_strerror(err, errbuf, sizeof(errbuf)),
362 #ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
363 ap_escape_logitem(pool,
366 #ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED
372 static apr_status_t run_cgi_child(apr_file_t **script_out,
373 apr_file_t **script_in,
374 apr_file_t **script_err,
376 const char * const argv[],
379 cgi_exec_info_t *e_info)
381 const char * const *env;
382 apr_procattr_t *procattr;
384 apr_status_t rc = APR_SUCCESS;
386 #if defined(RLIMIT_CPU) || defined(RLIMIT_NPROC) || \
387 defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined (RLIMIT_AS)
389 core_dir_config *conf = ap_get_module_config(r->per_dir_config,
395 /* Under OS/2 need to use device con. */
396 FILE *dbg = fopen("con", "w");
398 FILE *dbg = fopen("/dev/tty", "w");
403 RAISE_SIGSTOP(CGI_CHILD);
405 fprintf(dbg, "Attempting to exec %s as CGI child (argv0 = %s)\n",
406 r->filename, argv[0]);
409 env = (const char * const *)ap_create_environment(p, r->subprocess_env);
412 fprintf(dbg, "Environment: \n");
413 for (i = 0; env[i]; ++i)
414 fprintf(dbg, "'%s'\n", env[i]);
417 /* Transmute ourselves into the script.
418 * NB only ISINDEX scripts get decoded arguments.
420 if (((rc = apr_procattr_create(&procattr, p)) != APR_SUCCESS) ||
421 ((rc = apr_procattr_io_set(procattr,
424 e_info->err_pipe)) != APR_SUCCESS) ||
425 ((rc = apr_procattr_dir_set(procattr,
426 ap_make_dirstr_parent(r->pool,
427 r->filename))) != APR_SUCCESS) ||
429 ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_CPU,
430 conf->limit_cpu)) != APR_SUCCESS) ||
432 #if defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS)
433 ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_MEM,
434 conf->limit_mem)) != APR_SUCCESS) ||
437 ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_NPROC,
438 conf->limit_nproc)) != APR_SUCCESS) ||
440 ((rc = apr_procattr_cmdtype_set(procattr,
441 e_info->cmd_type)) != APR_SUCCESS) ||
443 ((rc = apr_procattr_detach_set(procattr,
444 e_info->detached)) != APR_SUCCESS) ||
445 ((rc = apr_procattr_addrspace_set(procattr,
446 e_info->addrspace)) != APR_SUCCESS) ||
447 ((rc = apr_procattr_child_errfn_set(procattr, cgi_child_errfn)) != APR_SUCCESS)) {
448 /* Something bad happened, tell the world. */
449 ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r,
450 "couldn't set child process attributes: %s", r->filename);
453 procnew = apr_pcalloc(p, sizeof(*procnew));
454 rc = ap_os_create_privileged_process(r, procnew, command, argv, env,
457 if (rc != APR_SUCCESS) {
458 /* Bad things happened. Everyone should have cleaned up. */
459 ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_TOCLIENT, rc, r,
460 "couldn't create child process: %d: %s", rc,
461 apr_filepath_name_get(r->filename));
464 apr_pool_note_subprocess(p, procnew, APR_KILL_AFTER_TIMEOUT);
466 *script_in = procnew->out;
469 apr_file_pipe_timeout_set(*script_in, r->server->timeout);
471 if (e_info->prog_type == RUN_AS_CGI) {
472 *script_out = procnew->in;
475 apr_file_pipe_timeout_set(*script_out, r->server->timeout);
477 *script_err = procnew->err;
480 apr_file_pipe_timeout_set(*script_err, r->server->timeout);
491 static apr_status_t default_build_command(const char **cmd, const char ***argv,
492 request_rec *r, apr_pool_t *p,
493 cgi_exec_info_t *e_info)
495 int numwords, x, idx;
497 const char *args = NULL;
499 if (e_info->process_cgi) {
501 /* Do not process r->args if they contain an '=' assignment
503 if (r->args && r->args[0] && !ap_strchr_c(r->args, '=')) {
512 /* count the number of keywords */
513 for (x = 0, numwords = 2; args[x]; x++) {
514 if (args[x] == '+') {
519 /* Everything is - 1 to account for the first parameter
520 * which is the program name.
522 if (numwords > APACHE_ARG_MAX - 1) {
523 numwords = APACHE_ARG_MAX - 1; /* Truncate args to prevent overrun */
525 *argv = apr_palloc(p, (numwords + 2) * sizeof(char *));
527 for (x = 1, idx = 1; x < numwords; x++) {
528 w = ap_getword_nulls(p, &args, '+');
530 (*argv)[idx++] = ap_escape_shell_cmd(p, w);
537 static void discard_script_output(apr_bucket_brigade *bb)
544 for (e = APR_BRIGADE_FIRST(bb);
545 e != APR_BRIGADE_SENTINEL(bb);
546 e = APR_BUCKET_NEXT(e))
548 if (APR_BUCKET_IS_EOS(e)) {
551 rv = apr_bucket_read(e, &buf, &len, APR_BLOCK_READ);
552 if (rv != APR_SUCCESS) {
558 #if APR_FILES_AS_SOCKETS
560 /* A CGI bucket type is needed to catch any output to stderr from the
561 * script; see PR 22030. */
562 static const apr_bucket_type_t bucket_type_cgi;
564 struct cgi_bucket_data {
565 apr_pollset_t *pollset;
569 /* Create a CGI bucket using pipes from script stdout 'out'
570 * and stderr 'err', for request 'r'. */
571 static apr_bucket *cgi_bucket_create(request_rec *r,
572 apr_file_t *out, apr_file_t *err,
573 apr_bucket_alloc_t *list)
575 apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);
578 struct cgi_bucket_data *data = apr_palloc(r->pool, sizeof *data);
581 b->free = apr_bucket_free;
583 b->type = &bucket_type_cgi;
584 b->length = (apr_size_t)(-1);
587 /* Create the pollset */
588 rv = apr_pollset_create(&data->pollset, 2, r->pool, 0);
589 AP_DEBUG_ASSERT(rv == APR_SUCCESS);
591 fd.desc_type = APR_POLL_FILE;
592 fd.reqevents = APR_POLLIN;
594 fd.desc.f = out; /* script's stdout */
595 fd.client_data = (void *)1;
596 rv = apr_pollset_add(data->pollset, &fd);
597 AP_DEBUG_ASSERT(rv == APR_SUCCESS);
599 fd.desc.f = err; /* script's stderr */
600 fd.client_data = (void *)2;
601 rv = apr_pollset_add(data->pollset, &fd);
602 AP_DEBUG_ASSERT(rv == APR_SUCCESS);
609 /* Create a duplicate CGI bucket using given bucket data */
610 static apr_bucket *cgi_bucket_dup(struct cgi_bucket_data *data,
611 apr_bucket_alloc_t *list)
613 apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);
615 b->free = apr_bucket_free;
617 b->type = &bucket_type_cgi;
618 b->length = (apr_size_t)(-1);
624 /* Handle stdout from CGI child. Duplicate of logic from the _read
625 * method of the real APR pipe bucket implementation. */
626 static apr_status_t cgi_read_stdout(apr_bucket *a, apr_file_t *out,
627 const char **str, apr_size_t *len)
633 *len = APR_BUCKET_BUFF_SIZE;
634 buf = apr_bucket_alloc(*len, a->list); /* XXX: check for failure? */
636 rv = apr_file_read(out, buf, len);
638 if (rv != APR_SUCCESS && rv != APR_EOF) {
639 apr_bucket_free(buf);
644 struct cgi_bucket_data *data = a->data;
647 /* Change the current bucket to refer to what we read */
648 a = apr_bucket_heap_make(a, buf, *len, apr_bucket_free);
650 h->alloc_len = APR_BUCKET_BUFF_SIZE; /* note the real buffer size */
652 APR_BUCKET_INSERT_AFTER(a, cgi_bucket_dup(data, a->list));
655 apr_bucket_free(buf);
656 a = apr_bucket_immortal_make(a, "", 0);
662 /* Read method of CGI bucket: polls on stderr and stdout of the child,
663 * sending any stderr output immediately away to the error log. */
664 static apr_status_t cgi_bucket_read(apr_bucket *b, const char **str,
665 apr_size_t *len, apr_read_type_e block)
667 struct cgi_bucket_data *data = b->data;
668 apr_interval_time_t timeout;
672 timeout = block == APR_NONBLOCK_READ ? 0 : data->r->server->timeout;
675 const apr_pollfd_t *results;
678 rv = apr_pollset_poll(data->pollset, timeout, &num, &results);
679 if (APR_STATUS_IS_TIMEUP(rv)) {
680 return timeout == 0 ? APR_EAGAIN : rv;
682 else if (APR_STATUS_IS_EINTR(rv)) {
685 else if (rv != APR_SUCCESS) {
686 ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, data->r,
687 "poll failed waiting for CGI child");
691 for (; num; num--, results++) {
692 if (results[0].client_data == (void *)1) {
694 rv = cgi_read_stdout(b, results[0].desc.f, str, len);
695 if (APR_STATUS_IS_EOF(rv)) {
701 apr_status_t rv2 = log_script_err(data->r, results[0].desc.f);
702 if (APR_STATUS_IS_EOF(rv2)) {
703 apr_pollset_remove(data->pollset, &results[0]);
713 static const apr_bucket_type_t bucket_type_cgi = {
714 "CGI", 5, APR_BUCKET_DATA,
715 apr_bucket_destroy_noop,
717 apr_bucket_setaside_notimpl,
718 apr_bucket_split_notimpl,
719 apr_bucket_copy_notimpl
724 static int cgi_handler(request_rec *r)
727 apr_size_t dbpos = 0;
732 apr_file_t *script_out = NULL, *script_in = NULL, *script_err = NULL;
733 apr_bucket_brigade *bb;
736 int seen_eos, child_stopped_reading;
738 cgi_server_conf *conf;
740 cgi_exec_info_t e_info;
741 conn_rec *c = r->connection;
743 if(strcmp(r->handler, CGI_MAGIC_TYPE) && strcmp(r->handler, "cgi-script"))
746 is_included = !strcmp(r->protocol, "INCLUDED");
748 p = r->main ? r->main->pool : r->pool;
750 if (r->method_number == M_OPTIONS) {
751 /* 99 out of 100 CGI scripts, this is all they support */
752 r->allowed |= (AP_METHOD_BIT << M_GET);
753 r->allowed |= (AP_METHOD_BIT << M_POST);
757 argv0 = apr_filepath_name_get(r->filename);
758 nph = !(strncmp(argv0, "nph-", 4));
759 conf = ap_get_module_config(r->server->module_config, &cgi_module);
761 if (!(ap_allow_options(r) & OPT_EXECCGI) && !is_scriptaliased(r))
762 return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
763 "Options ExecCGI is off in this directory");
764 if (nph && is_included)
765 return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
766 "attempt to include NPH CGI script");
768 if (r->finfo.filetype == 0)
769 return log_scripterror(r, conf, HTTP_NOT_FOUND, 0,
770 "script not found or unable to stat");
771 if (r->finfo.filetype == APR_DIR)
772 return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
773 "attempt to invoke directory as script");
775 if ((r->used_path_info == AP_REQ_REJECT_PATH_INFO) &&
776 r->path_info && *r->path_info)
778 /* default to accept */
779 return log_scripterror(r, conf, HTTP_NOT_FOUND, 0,
780 "AcceptPathInfo off disallows user's path");
783 if (!ap_suexec_enabled) {
784 if (!ap_can_exec(&r->finfo))
785 return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
786 "file permissions deny server execution");
790 ap_add_common_vars(r);
793 e_info.process_cgi = 1;
794 e_info.cmd_type = APR_PROGRAM;
796 e_info.in_pipe = APR_CHILD_BLOCK;
797 e_info.out_pipe = APR_CHILD_BLOCK;
798 e_info.err_pipe = APR_CHILD_BLOCK;
799 e_info.prog_type = RUN_AS_CGI;
803 e_info.addrspace = 0;
805 /* build the command line */
806 if ((rv = cgi_build_command(&command, &argv, r, p, &e_info)) != APR_SUCCESS) {
807 ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
808 "don't know how to spawn child process: %s",
810 return HTTP_INTERNAL_SERVER_ERROR;
813 /* run the script in its own process */
814 if ((rv = run_cgi_child(&script_out, &script_in, &script_err,
815 command, argv, r, p, &e_info)) != APR_SUCCESS) {
816 ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
817 "couldn't spawn child process: %s", r->filename);
818 return HTTP_INTERNAL_SERVER_ERROR;
821 /* Transfer any put/post args, CERN style...
822 * Note that we already ignore SIGPIPE in the core server.
824 bb = apr_brigade_create(r->pool, c->bucket_alloc);
826 child_stopped_reading = 0;
828 dbuf = apr_palloc(r->pool, conf->bufbytes + 1);
834 rv = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES,
835 APR_BLOCK_READ, HUGE_STRING_LEN);
837 if (rv != APR_SUCCESS) {
841 for (bucket = APR_BRIGADE_FIRST(bb);
842 bucket != APR_BRIGADE_SENTINEL(bb);
843 bucket = APR_BUCKET_NEXT(bucket))
848 if (APR_BUCKET_IS_EOS(bucket)) {
853 /* We can't do much with this. */
854 if (APR_BUCKET_IS_FLUSH(bucket)) {
858 /* If the child stopped, we still must read to EOS. */
859 if (child_stopped_reading) {
864 apr_bucket_read(bucket, &data, &len, APR_BLOCK_READ);
866 if (conf->logname && dbpos < conf->bufbytes) {
869 if ((dbpos + len) > conf->bufbytes) {
870 cursize = conf->bufbytes - dbpos;
875 memcpy(dbuf + dbpos, data, cursize);
879 /* Keep writing data to the child until done or too much time
880 * elapses with no progress or an error occurs.
882 rv = apr_file_write_full(script_out, data, len, NULL);
884 if (rv != APR_SUCCESS) {
885 /* silly script stopped reading, soak up remaining message */
886 child_stopped_reading = 1;
889 apr_brigade_cleanup(bb);
896 /* Is this flush really needed? */
897 apr_file_flush(script_out);
898 apr_file_close(script_out);
900 AP_DEBUG_ASSERT(script_in != NULL);
902 apr_brigade_cleanup(bb);
904 #if APR_FILES_AS_SOCKETS
905 apr_file_pipe_timeout_set(script_in, 0);
906 apr_file_pipe_timeout_set(script_err, 0);
908 b = cgi_bucket_create(r, script_in, script_err, c->bucket_alloc);
910 b = apr_bucket_pipe_create(script_in, c->bucket_alloc);
912 APR_BRIGADE_INSERT_TAIL(bb, b);
913 b = apr_bucket_eos_create(c->bucket_alloc);
914 APR_BRIGADE_INSERT_TAIL(bb, b);
916 /* Handle script return... */
918 const char *location;
919 char sbuf[MAX_STRING_LEN];
922 if ((ret = ap_scan_script_header_err_brigade(r, bb, sbuf))) {
923 return log_script(r, conf, ret, dbuf, sbuf, bb, script_err);
926 location = apr_table_get(r->headers_out, "Location");
928 if (location && location[0] == '/' && r->status == 200) {
929 discard_script_output(bb);
930 apr_brigade_destroy(bb);
931 apr_file_pipe_timeout_set(script_err, r->server->timeout);
932 log_script_err(r, script_err);
933 /* This redirect needs to be a GET no matter what the original
936 r->method = apr_pstrdup(r->pool, "GET");
937 r->method_number = M_GET;
939 /* We already read the message body (if any), so don't allow
940 * the redirected request to think it has one. We can ignore
941 * Transfer-Encoding, since we used REQUEST_CHUNKED_ERROR.
943 apr_table_unset(r->headers_in, "Content-Length");
945 ap_internal_redirect_handler(location, r);
948 else if (location && r->status == 200) {
949 /* XX Note that if a script wants to produce its own Redirect
950 * body, it now has to explicitly *say* "Status: 302"
952 discard_script_output(bb);
953 apr_brigade_destroy(bb);
954 return HTTP_MOVED_TEMPORARILY;
957 rv = ap_pass_brigade(r->output_filters, bb);
960 struct ap_filter_t *cur;
962 /* get rid of all filters up through protocol... since we
963 * haven't parsed off the headers, there is no way they can
967 cur = r->proto_output_filters;
968 while (cur && cur->frec->ftype < AP_FTYPE_CONNECTION) {
971 r->output_filters = r->proto_output_filters = cur;
973 rv = ap_pass_brigade(r->output_filters, bb);
976 /* don't soak up script output if errors occurred writing it
977 * out... otherwise, we prolong the life of the script when the
978 * connection drops or we stopped sending output for some other
980 if (rv == APR_SUCCESS && !r->connection->aborted) {
981 apr_file_pipe_timeout_set(script_err, r->server->timeout);
982 log_script_err(r, script_err);
985 apr_file_close(script_err);
987 return OK; /* NOT r->status, even if it has changed. */
990 /*============================================================================
991 *============================================================================
992 * This is the beginning of the cgi filter code moved from mod_include. This
993 * is the code required to handle the "exec" SSI directive.
994 *============================================================================
995 *============================================================================*/
996 static apr_status_t include_cgi(include_ctx_t *ctx, ap_filter_t *f,
997 apr_bucket_brigade *bb, char *s)
999 request_rec *r = f->r;
1000 request_rec *rr = ap_sub_req_lookup_uri(s, r, f->next);
1003 if (rr->status != HTTP_OK) {
1004 ap_destroy_sub_req(rr);
1005 return APR_EGENERAL;
1008 /* No hardwired path info or query allowed */
1009 if ((rr->path_info && rr->path_info[0]) || rr->args) {
1010 ap_destroy_sub_req(rr);
1011 return APR_EGENERAL;
1013 if (rr->finfo.filetype != APR_REG) {
1014 ap_destroy_sub_req(rr);
1015 return APR_EGENERAL;
1018 /* Script gets parameters of the *document*, for back compatibility */
1019 rr->path_info = r->path_info; /* hard to get right; see mod_cgi.c */
1022 /* Force sub_req to be treated as a CGI request, even if ordinary
1023 * typing rules would have called it something else.
1025 ap_set_content_type(rr, CGI_MAGIC_TYPE);
1028 rr_status = ap_run_sub_req(rr);
1029 if (ap_is_HTTP_REDIRECT(rr_status)) {
1030 const char *location = apr_table_get(rr->headers_out, "Location");
1035 location = ap_escape_html(rr->pool, location);
1036 buffer = apr_pstrcat(ctx->pool, "<a href=\"", location, "\">",
1037 location, "</a>", NULL);
1039 APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_pool_create(buffer,
1040 strlen(buffer), ctx->pool,
1041 f->c->bucket_alloc));
1045 ap_destroy_sub_req(rr);
1050 static apr_status_t include_cmd(include_ctx_t *ctx, ap_filter_t *f,
1051 apr_bucket_brigade *bb, const char *command)
1053 cgi_exec_info_t e_info;
1055 apr_file_t *script_out = NULL, *script_in = NULL, *script_err = NULL;
1057 request_rec *r = f->r;
1061 e_info.process_cgi = 0;
1062 e_info.cmd_type = APR_SHELLCMD;
1063 e_info.detached = 0;
1064 e_info.in_pipe = APR_NO_PIPE;
1065 e_info.out_pipe = APR_FULL_BLOCK;
1066 e_info.err_pipe = APR_NO_PIPE;
1067 e_info.prog_type = RUN_AS_SSI;
1070 e_info.next = f->next;
1071 e_info.addrspace = 0;
1073 if ((rv = cgi_build_command(&command, &argv, r, r->pool,
1074 &e_info)) != APR_SUCCESS) {
1075 ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
1076 "don't know how to spawn cmd child process: %s",
1081 /* run the script in its own process */
1082 if ((rv = run_cgi_child(&script_out, &script_in, &script_err,
1083 command, argv, r, r->pool,
1084 &e_info)) != APR_SUCCESS) {
1085 ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
1086 "couldn't spawn child process: %s", r->filename);
1090 APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_pipe_create(script_in,
1091 f->c->bucket_alloc));
1094 /* We can't close the pipe here, because we may return before the
1095 * full CGI has been sent to the network. That's okay though,
1096 * because we can rely on the pool to close the pipe for us.
1101 static apr_status_t handle_exec(include_ctx_t *ctx, ap_filter_t *f,
1102 apr_bucket_brigade *bb)
1105 char *tag_val = NULL;
1106 request_rec *r = f->r;
1107 char *file = r->filename;
1108 char parsed_string[MAX_STRING_LEN];
1111 ap_log_rerror(APLOG_MARK,
1112 (ctx->flags & SSI_FLAG_PRINTING)
1113 ? APLOG_ERR : APLOG_WARNING,
1114 0, r, "missing argument for exec element in %s",
1118 if (!(ctx->flags & SSI_FLAG_PRINTING)) {
1123 SSI_CREATE_ERROR_BUCKET(ctx, f, bb);
1127 if (ctx->flags & SSI_FLAG_NO_EXEC) {
1128 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "exec used but not allowed "
1129 "in %s", r->filename);
1130 SSI_CREATE_ERROR_BUCKET(ctx, f, bb);
1135 cgi_pfn_gtv(ctx, &tag, &tag_val, SSI_VALUE_DECODED);
1136 if (!tag || !tag_val) {
1140 if (!strcmp(tag, "cmd")) {
1143 cgi_pfn_ps(ctx, tag_val, parsed_string, sizeof(parsed_string),
1144 SSI_EXPAND_LEAVE_NAME);
1146 rv = include_cmd(ctx, f, bb, parsed_string);
1147 if (rv != APR_SUCCESS) {
1148 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "execution failure "
1149 "for parameter \"%s\" to tag exec in file %s",
1151 SSI_CREATE_ERROR_BUCKET(ctx, f, bb);
1155 else if (!strcmp(tag, "cgi")) {
1158 cgi_pfn_ps(ctx, tag_val, parsed_string, sizeof(parsed_string),
1159 SSI_EXPAND_DROP_NAME);
1161 rv = include_cgi(ctx, f, bb, parsed_string);
1162 if (rv != APR_SUCCESS) {
1163 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "invalid CGI ref "
1164 "\"%s\" in %s", tag_val, file);
1165 SSI_CREATE_ERROR_BUCKET(ctx, f, bb);
1170 ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "unknown parameter "
1171 "\"%s\" to tag exec in %s", tag, file);
1172 SSI_CREATE_ERROR_BUCKET(ctx, f, bb);
1181 /*============================================================================
1182 *============================================================================
1183 * This is the end of the cgi filter code moved from mod_include.
1184 *============================================================================
1185 *============================================================================*/
1188 static int cgi_post_config(apr_pool_t *p, apr_pool_t *plog,
1189 apr_pool_t *ptemp, server_rec *s)
1191 cgi_pfn_reg_with_ssi = APR_RETRIEVE_OPTIONAL_FN(ap_register_include_handler);
1192 cgi_pfn_gtv = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_get_tag_and_value);
1193 cgi_pfn_ps = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_parse_string);
1195 if ((cgi_pfn_reg_with_ssi) && (cgi_pfn_gtv) && (cgi_pfn_ps)) {
1196 /* Required by mod_include filter. This is how mod_cgi registers
1197 * with mod_include to provide processing of the exec directive.
1199 cgi_pfn_reg_with_ssi("exec", handle_exec);
1202 /* This is the means by which unusual (non-unix) os's may find alternate
1203 * means to run a given command (e.g. shebang/registry parsing on Win32)
1205 cgi_build_command = APR_RETRIEVE_OPTIONAL_FN(ap_cgi_build_command);
1206 if (!cgi_build_command) {
1207 cgi_build_command = default_build_command;
1212 static void register_hooks(apr_pool_t *p)
1214 static const char * const aszPre[] = { "mod_include.c", NULL };
1215 ap_hook_handler(cgi_handler, NULL, NULL, APR_HOOK_MIDDLE);
1216 ap_hook_post_config(cgi_post_config, aszPre, NULL, APR_HOOK_REALLY_FIRST);
1219 module AP_MODULE_DECLARE_DATA cgi_module =
1221 STANDARD20_MODULE_STUFF,
1222 NULL, /* dir config creater */
1223 NULL, /* dir merger --- default is to override */
1224 create_cgi_config, /* server config */
1225 merge_cgi_config, /* merge server config */
1226 cgi_cmds, /* command apr_table_t */
1227 register_hooks /* register hooks */