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48d57962bc371b45f34699bf59b1348534ea8a13
apache/modules/generators/mod_cgi.c
William A. Rowe Jr 48d57962bc Safe casts - we are assured that len_read is positive, but it must be 
stored as an int to initially check the ap_get_client_block() result.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89717 13f79535-47bb-0310-9956-ffa450edef68
2001-07-25 22:02:54 +00:00

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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2001 The Apache Software Foundation. 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. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``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 SOFTWARE FOUNDATION OR
* ITS 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 Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
/*
* 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 "apr.h"
#include "apr_strings.h"
#include "apr_thread_proc.h" /* for RLIMIT stuff */
#include "apr_optional.h"
#include "apr_buckets.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"
#define CORE_PRIVATE
#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 "../filters/mod_include.h"
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;
typedef enum {RUN_AS_SSI, RUN_AS_CGI} prog_types;
typedef struct {
apr_int32_t in_pipe;
apr_int32_t out_pipe;
apr_int32_t err_pipe;
apr_cmdtype_e cmd_type;
prog_types prog_type;
apr_bucket_brigade **bb;
include_ctx_t *ctx;
ap_filter_t *next;
} exec_info;
/* 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;
int bufbytes;
} cgi_server_conf;
static void *create_cgi_config(apr_pool_t *p, server_rec *s)
{
cgi_server_conf *c =
(cgi_server_conf *) apr_pcalloc(p, sizeof(cgi_server_conf));
c->logname = NULL;
c->logbytes = DEFAULT_LOGBYTES;
c->bufbytes = DEFAULT_BUFBYTES;
return c;
}
static void *merge_cgi_config(apr_pool_t *p, void *basev, void *overridesv)
{
cgi_server_conf *base = (cgi_server_conf *) basev, *overrides = (cgi_server_conf *) overridesv;
return overrides->logname ? overrides : base;
}
static const char *set_scriptlog(cmd_parms *cmd, void *dummy, const char *arg)
{
server_rec *s = cmd->server;
cgi_server_conf *conf = ap_get_module_config(s->module_config,
&cgi_module);
conf->logname = arg;
return NULL;
}
static const char *set_scriptlog_length(cmd_parms *cmd, void *dummy,
const char *arg)
{
server_rec *s = cmd->server;
cgi_server_conf *conf = ap_get_module_config(s->module_config,
&cgi_module);
conf->logbytes = atol(arg);
return NULL;
}
static const char *set_scriptlog_buffer(cmd_parms *cmd, void *dummy,
const char *arg)
{
server_rec *s = cmd->server;
cgi_server_conf *conf = ap_get_module_config(s->module_config,
&cgi_module);
conf->bufbytes = atoi(arg);
return NULL;
}
static const command_rec cgi_cmds[] =
{
AP_INIT_TAKE1("ScriptLog", set_scriptlog, NULL, RSRC_CONF,
"the name of a log for script debugging info"),
AP_INIT_TAKE1("ScriptLogLength", set_scriptlog_length, NULL, RSRC_CONF,
"the maximum length (in bytes) of the script debug log"),
AP_INIT_TAKE1("ScriptLogBuffer", set_scriptlog_buffer, NULL, RSRC_CONF,
"the maximum size (in bytes) to record of a POST request"),
{NULL}
};
static int log_scripterror(request_rec *r, cgi_server_conf * conf, int ret,
apr_status_t rv, char *error)
{
apr_file_t *f = NULL;
apr_finfo_t finfo;
char time_str[APR_CTIME_LEN];
int log_flags = rv ? APLOG_ERR : APLOG_NOERRNO | APLOG_ERR;
ap_log_rerror(APLOG_MARK, log_flags, rv, r,
"%s: %s", error, r->filename);
if (!conf->logname ||
((apr_stat(&finfo, ap_server_root_relative(r->pool, conf->logname),
APR_FINFO_SIZE, r->pool) == APR_SUCCESS)
&& (finfo.size > conf->logbytes)) ||
(apr_file_open(&f, ap_server_root_relative(r->pool, 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 void log_script_err(request_rec *r, apr_file_t *script_err)
{
char argsbuffer[HUGE_STRING_LEN];
char *newline;
while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_err) == 0) {
newline = strchr(argsbuffer, '\n');
if (newline) {
*newline = '\0';
}
ap_log_rerror(APLOG_MARK, APLOG_ERR | APLOG_NOERRNO, 0, r,
"%s", argsbuffer);
}
}
static int log_script(request_rec *r, cgi_server_conf * conf, int ret,
char *dbuf, const char *sbuf, apr_file_t *script_in,
apr_file_t *script_err)
{
apr_array_header_t *hdrs_arr = apr_table_elts(r->headers_in);
apr_table_entry_t *hdrs = (apr_table_entry_t *) hdrs_arr->elts;
char argsbuffer[HUGE_STRING_LEN];
apr_file_t *f = NULL;
int i;
apr_finfo_t finfo;
char time_str[APR_CTIME_LEN];
if (!conf->logname ||
((apr_stat(&finfo, ap_server_root_relative(r->pool, conf->logname),
APR_FINFO_SIZE, r->pool) == APR_SUCCESS)
&& (finfo.size > conf->logbytes)) ||
(apr_file_open(&f, ap_server_root_relative(r->pool, conf->logname),
APR_APPEND|APR_WRITE|APR_CREATE, APR_OS_DEFAULT, r->pool) != APR_SUCCESS)) {
/* Soak up script output */
while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_in) == 0)
continue;
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 = (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);
if (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_in) == 0) {
apr_file_puts("%stdout\n", f);
apr_file_puts(argsbuffer, f);
while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_in) == 0)
apr_file_puts(argsbuffer, f);
apr_file_puts("\n", f);
}
if (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_err) == 0) {
apr_file_puts("%stderr\n", f);
apr_file_puts(argsbuffer, f);
while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_err) == 0)
apr_file_puts(argsbuffer, f);
apr_file_puts("\n", f);
}
apr_file_close(script_in);
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, ap_filter_t *next)
{
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, next);
if (pa_req->filename) {
apr_table_setn(e, "PATH_TRANSLATED",
apr_pstrcat(r->pool, pa_req->filename, pa_req->path_info, NULL));
}
}
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 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,
exec_info *e_info)
{
const char * const *env;
apr_procattr_t *procattr;
apr_proc_t *procnew;
apr_status_t rc = APR_SUCCESS;
#if defined(RLIMIT_CPU) || defined(RLIMIT_NPROC) || \
defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined (RLIMIT_AS)
core_dir_config *conf = ap_get_module_config(r->per_dir_config,
&core_module);
#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 %sCGI child (argv0 = %s)\n",
r->filename, cld->nph ? "NPH " : "", argv0);
#endif
if (e_info->prog_type == RUN_AS_CGI) {
ap_add_cgi_vars(r);
}
else /* SSIs want a controlled environment and a special path. */
{
add_ssi_vars(r, e_info->next);
}
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]);
#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) ||
#ifdef RLIMIT_CPU
((rc = apr_procattr_limit_set(procattr, APR_LIMIT_CPU, conf->limit_cpu)) != APR_SUCCESS) ||
#endif
#if defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS)
((rc = apr_procattr_limit_set(procattr, APR_LIMIT_MEM, conf->limit_mem)) != APR_SUCCESS) ||
#endif
#ifdef RLIMIT_NPROC
((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)) {
/* Something bad happened, tell the world. */
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r,
"couldn't set child process attributes: %s", r->filename);
}
else {
procnew = apr_pcalloc(p, sizeof(*procnew));
if (e_info->prog_type == RUN_AS_SSI) {
SPLIT_AND_PASS_PRETAG_BUCKETS(*(e_info->bb), e_info->ctx, e_info->next);
}
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. */
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r,
"couldn't create child process: %d: %s", rc, r->filename);
}
else {
apr_pool_note_subprocess(p, procnew, kill_after_timeout);
*script_in = procnew->out;
if (!script_in)
return APR_EBADF;
apr_file_pipe_timeout_set(*script_in, (int)(r->server->timeout * APR_USEC_PER_SEC));
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, (int)(r->server->timeout * APR_USEC_PER_SEC));
*script_err = procnew->err;
if (!*script_err)
return APR_EBADF;
apr_file_pipe_timeout_set(*script_err, (int)(r->server->timeout * APR_USEC_PER_SEC));
}
}
}
return (rc);
}
static apr_status_t build_argv_list(const char ***argv, request_rec *r,
apr_pool_t *p)
{
int numwords, x, idx;
char *w;
const char *args = r->args;
if (!args || !args[0] || ap_strchr_c(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. We didn't used to have to do this, but APR wants it.
*/
if (numwords > APACHE_ARG_MAX - 1) {
numwords = APACHE_ARG_MAX - 1; /* Truncate args to prevent overrun */
}
*argv = apr_palloc(p, (numwords + 2) * sizeof(char *));
for (x = 1, idx = 1; x < numwords; x++) {
w = ap_getword_nulls(p, &args, '+');
ap_unescape_url(w);
(*argv)[idx++] = ap_escape_shell_cmd(p, w);
}
(*argv)[idx] = NULL;
return APR_SUCCESS;
}
static apr_status_t build_command_line(const char **cmd, request_rec *r,
apr_pool_t *p)
{
#ifdef WIN32
char *quoted_filename = NULL;
char *interpreter = NULL;
char *arguments = NULL;
file_type_e fileType;
#endif
const char *argv0;
/* Allow suexec's "/" check to succeed */
if ((argv0 = strrchr(r->filename, '/')) != NULL)
argv0++;
else
argv0 = r->filename;
#ifdef WIN32
*cmd = NULL;
fileType = ap_get_win32_interpreter(r, &interpreter, &arguments);
if (fileType == eFileTypeUNKNOWN) {
ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, r,
"%s is not executable; ensure interpreted scripts have "
"\"#!\" first line",
r->filename);
return APR_EBADF;
}
/*
* Build the command string to pass to ap_os_create_privileged_process()
*/
quoted_filename = apr_pstrcat(p, "\"", r->filename, "\"", NULL);
if (interpreter && *interpreter) {
if (arguments && *arguments)
*cmd = apr_pstrcat(p, interpreter, " ", quoted_filename, " ",
arguments, NULL);
else
*cmd = apr_pstrcat(p, interpreter, " ", quoted_filename, " ", NULL);
}
else if (arguments && *arguments) {
*cmd = apr_pstrcat(p, quoted_filename, " ", arguments, NULL);
}
else {
*cmd = apr_pstrcat(p, quoted_filename, NULL);
}
#else
*cmd = argv0;
#endif
return APR_SUCCESS;
}
static int cgi_handler(request_rec *r)
{
int retval, nph, 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;
char argsbuffer[HUGE_STRING_LEN];
int is_included = !strcmp(r->protocol, "INCLUDED");
apr_pool_t *p;
cgi_server_conf *conf;
apr_status_t rv;
exec_info e_info;
if(strcmp(r->handler,CGI_MAGIC_TYPE) && strcmp(r->handler,"cgi-script"))
return DECLINED;
p = r->main ? r->main->pool : r->pool;
if (r->method_number == M_OPTIONS) {
/* 99 out of 100 CGI scripts, this is all they support */
r->allowed |= (1 << M_GET);
r->allowed |= (1 << M_POST);
return DECLINED;
}
if ((argv0 = strrchr(r->filename, '/')) != NULL)
argv0++;
else
argv0 = 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,
"Options ExecCGI is off in this directory");
if (nph && is_included)
return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
"attempt to include NPH CGI script");
#if defined(OS2) || defined(WIN32)
/* XXX: This is wrong. As an option, perhaps, but not by default...
* we are back to the same argument that a url should be a unique
* entity until the sysadmin overrides that behavior.
* Allow for cgi files without the .EXE extension on them under OS/2
*/
if (r->finfo.filetype == 0) {
apr_finfo_t finfo;
char *newfile;
apr_status_t rv;
newfile = apr_pstrcat(r->pool, r->filename, ".EXE", NULL);
if (((rv = apr_stat(&finfo, newfile, APR_FINFO_TYPE, r->pool))
!= APR_SUCCESS) || (finfo.filetype != APR_REG)) {
return log_scripterror(r, conf, HTTP_NOT_FOUND, rv,
"script not found or unable to stat");
} else {
r->filename = newfile;
}
}
#else
if (r->finfo.filetype == 0)
return log_scripterror(r, conf, HTTP_NOT_FOUND, 0,
"script not found or unable to stat");
#endif
if (r->finfo.filetype == APR_DIR)
return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
"attempt to invoke directory as script");
/*
if (!ap_suexec_enabled) {
if (!ap_can_exec(&r->finfo))
return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
"file permissions deny server execution");
}
*/
if ((retval = ap_setup_client_block(r, REQUEST_CHUNKED_ERROR)))
return retval;
ap_add_common_vars(r);
/* build the command line */
if ((rv = build_command_line(&command, r, p)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"couldn't spawn child process: %s", r->filename);
return HTTP_INTERNAL_SERVER_ERROR;
}
/* build the argument list */
else if ((rv = build_argv_list(&argv, r, p)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"couldn't spawn child process: %s", r->filename);
return HTTP_INTERNAL_SERVER_ERROR;
}
argv[0] = apr_pstrdup(p, command);
e_info.cmd_type = APR_PROGRAM;
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;
/* 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,
"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.
*/
if (ap_should_client_block(r)) {
int len_read, dbsize;
apr_size_t bytes_written, bytes_to_write;
apr_status_t rv;
if (conf->logname) {
dbuf = apr_pcalloc(r->pool, conf->bufbytes + 1);
dbpos = 0;
}
while ((len_read =
ap_get_client_block(r, argsbuffer, HUGE_STRING_LEN)) > 0) {
if (conf->logname) {
if ((dbpos + len_read) > conf->bufbytes) {
dbsize = conf->bufbytes - dbpos;
}
else {
dbsize = len_read;
}
memcpy(dbuf + dbpos, argsbuffer, dbsize);
dbpos += dbsize;
}
/* Keep writing data to the child until done or too much time
* elapses with no progress or an error occurs.
*/
bytes_written = 0;
do {
bytes_to_write = len_read - bytes_written;
rv = apr_file_write(script_out, argsbuffer + bytes_written,
&bytes_to_write);
bytes_written += bytes_to_write;
} while (rv == APR_SUCCESS
&& bytes_written < (apr_size_t)len_read);
if (rv != APR_SUCCESS || bytes_written < (apr_size_t)len_read) {
/* silly script stopped reading, soak up remaining message */
while (ap_get_client_block(r, argsbuffer, HUGE_STRING_LEN) > 0) {
/* dump it */
}
break;
}
}
apr_file_flush(script_out);
}
apr_file_close(script_out);
/* Handle script return... */
if (script_in && !nph) {
const char *location;
char sbuf[MAX_STRING_LEN];
int ret;
if ((ret = ap_scan_script_header_err(r, script_in, sbuf))) {
return log_script(r, conf, ret, dbuf, sbuf, script_in, script_err);
}
location = apr_table_get(r->headers_out, "Location");
if (location && location[0] == '/' && r->status == 200) {
/* Soak up all the script output */
while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_in) == 0) {
continue;
}
log_script_err(r, script_err);
/* This redirect needs to be a GET no matter what the original
* method was.
*/
r->method = apr_pstrdup(r->pool, "GET");
r->method_number = M_GET;
/* We already read the message body (if any), so don't allow
* the redirected request to think it has one. We can ignore
* Transfer-Encoding, since we used REQUEST_CHUNKED_ERROR.
*/
apr_table_unset(r->headers_in, "Content-Length");
ap_internal_redirect_handler(location, r);
return OK;
}
else if (location && r->status == 200) {
/* XX Note that if a script wants to produce its own Redirect
* body, it now has to explicitly *say* "Status: 302"
*/
return HTTP_MOVED_TEMPORARILY;
}
if (!r->header_only) {
bb = apr_brigade_create(r->pool);
b = apr_bucket_pipe_create(script_in);
APR_BRIGADE_INSERT_TAIL(bb, b);
b = apr_bucket_eos_create();
APR_BRIGADE_INSERT_TAIL(bb, b);
ap_pass_brigade(r->output_filters, bb);
}
log_script_err(r, script_err);
apr_file_close(script_err);
}
if (script_in && nph) {
bb = apr_brigade_create(r->pool);
b = apr_bucket_pipe_create(script_in);
APR_BRIGADE_INSERT_TAIL(bb, b);
b = apr_bucket_eos_create();
APR_BRIGADE_INSERT_TAIL(bb, b);
ap_pass_brigade(r->output_filters, bb);
}
return OK; /* NOT r->status, even if it has changed. */
}
/*============================================================================
*============================================================================
* This is the beginning of the cgi filter code moved from mod_include. This
* is the code required to handle the "exec" SSI directive.
*============================================================================
*============================================================================*/
static int include_cgi(char *s, request_rec *r, ap_filter_t *next,
apr_bucket *head_ptr, apr_bucket **inserted_head)
{
request_rec *rr = ap_sub_req_lookup_uri(s, r, next);
int rr_status;
apr_bucket *tmp_buck, *tmp2_buck;
if (rr->status != HTTP_OK) {
return -1;
}
/* No hardwired path info or query allowed */
if ((rr->path_info && rr->path_info[0]) || rr->args) {
return -1;
}
if (rr->finfo.protection == 0) {
return -1;
}
/* 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.
*/
rr->content_type = CGI_MAGIC_TYPE;
/* Run it. */
rr_status = ap_run_sub_req(rr);
if (ap_is_HTTP_REDIRECT(rr_status)) {
apr_size_t len_loc, h_wrt;
const char *location = apr_table_get(rr->headers_out, "Location");
location = ap_escape_html(rr->pool, location);
len_loc = strlen(location);
tmp_buck = apr_bucket_immortal_create("<A HREF=\"", sizeof("<A HREF=\""));
APR_BUCKET_INSERT_BEFORE(head_ptr, tmp_buck);
tmp2_buck = apr_bucket_heap_create(location, len_loc, 1, &h_wrt);
APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);
tmp2_buck = apr_bucket_immortal_create("\">", sizeof("\">"));
APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);
tmp2_buck = apr_bucket_heap_create(location, len_loc, 1, &h_wrt);
APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);
tmp2_buck = apr_bucket_immortal_create("</A>", sizeof("</A>"));
APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);
if (*inserted_head == NULL) {
*inserted_head = tmp_buck;
}
}
ap_destroy_sub_req(rr);
return 0;
}
static int include_cmd(include_ctx_t *ctx, apr_bucket_brigade **bb, char *command,
request_rec *r, ap_filter_t *f)
{
exec_info e_info;
const char **argv;
apr_file_t *script_out = NULL, *script_in = NULL, *script_err = NULL;
apr_bucket_brigade *bcgi;
apr_bucket *b;
if (build_argv_list(&argv, r, r->pool) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, errno, r,
"couldn't spawn cmd child process: %s", r->filename);
return HTTP_INTERNAL_SERVER_ERROR;
}
argv[0] = apr_pstrdup(r->pool, command);
e_info.cmd_type = APR_SHELLCMD;
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;
/* run the script in its own process */
if (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, errno, r,
"couldn't spawn child process: %s", r->filename);
return HTTP_INTERNAL_SERVER_ERROR;
}
bcgi = apr_brigade_create(r->pool);
b = apr_bucket_pipe_create(script_in);
APR_BRIGADE_INSERT_TAIL(bcgi, b);
ap_pass_brigade(f->next, bcgi);
/* 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 0;
}
static int handle_exec(include_ctx_t *ctx, apr_bucket_brigade **bb, request_rec *r,
ap_filter_t *f, apr_bucket *head_ptr, apr_bucket **inserted_head)
{
char *tag = NULL;
char *tag_val = NULL;
char *file = r->filename;
apr_bucket *tmp_buck;
char parsed_string[MAX_STRING_LEN];
*inserted_head = NULL;
if (ctx->flags & FLAG_PRINTING) {
if (ctx->flags & FLAG_NO_EXEC) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"exec used but not allowed in %s", r->filename);
CREATE_ERROR_BUCKET(ctx, tmp_buck, head_ptr, *inserted_head);
}
else {
while (1) {
cgi_pfn_gtv(ctx, &tag, &tag_val, 1);
if (tag_val == NULL) {
if (tag == NULL) {
return (0);
}
else {
return 1;
}
}
if (!strcmp(tag, "cmd")) {
cgi_pfn_ps(r, tag_val, parsed_string, sizeof(parsed_string), 1);
if (include_cmd(ctx, bb, parsed_string, r, f) == -1) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"execution failure for parameter \"%s\" "
"to tag exec in file %s", tag, r->filename);
CREATE_ERROR_BUCKET(ctx, tmp_buck, head_ptr, *inserted_head);
}
}
else if (!strcmp(tag, "cgi")) {
cgi_pfn_ps(r, tag_val, parsed_string, sizeof(parsed_string), 0);
SPLIT_AND_PASS_PRETAG_BUCKETS(*bb, ctx, f->next);
if (include_cgi(parsed_string, r, f->next, head_ptr, inserted_head) == -1) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"invalid CGI ref \"%s\" in %s", tag_val, file);
CREATE_ERROR_BUCKET(ctx, tmp_buck, head_ptr, *inserted_head);
}
}
else {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"unknown parameter \"%s\" to tag exec in %s", tag, file);
CREATE_ERROR_BUCKET(ctx, tmp_buck, head_ptr, *inserted_head);
}
}
}
}
return 0;
}
/*============================================================================
*============================================================================
* This is the end of the cgi filter code moved from mod_include.
*============================================================================
*============================================================================*/
static void cgi_post_config(apr_pool_t *p, apr_pool_t *plog,
apr_pool_t *ptemp, server_rec *s)
{
cgi_pfn_reg_with_ssi = APR_RETRIEVE_OPTIONAL_FN(ap_register_include_handler);
cgi_pfn_gtv = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_get_tag_and_value);
cgi_pfn_ps = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_parse_string);
if ((cgi_pfn_reg_with_ssi) && (cgi_pfn_gtv) && (cgi_pfn_ps)) {
/* Required by mod_include filter. This is how mod_cgi registers
* with mod_include to provide processing of the exec directive.
*/
cgi_pfn_reg_with_ssi("exec", handle_exec);
}
}
static void register_hooks(apr_pool_t *p)
{
static const char * const aszPre[] = { "mod_include.c", NULL };
ap_hook_handler(cgi_handler, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_post_config(cgi_post_config, aszPre, NULL, APR_HOOK_REALLY_FIRST);
}
module AP_MODULE_DECLARE_DATA cgi_module =
{
STANDARD20_MODULE_STUFF,
NULL, /* dir config creater */
NULL, /* dir merger --- default is to override */
create_cgi_config, /* server config */
merge_cgi_config, /* merge server config */
cgi_cmds, /* command apr_table_t */
register_hooks /* register hooks */
};
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