static int cgi_handler(request_rec *r)
{
int nph;
apr_size_t dbpos = 0;
const char *argv0;
const char *command;
const char **argv;
char *dbuf = NULL;
apr_file_t *script_out = NULL, *script_in = NULL, *script_err = NULL;
apr_bucket_brigade *bb;
apr_bucket *b;
int is_included;
int seen_eos, child_stopped_reading;
apr_pool_t *p;
cgi_server_conf *conf;
apr_status_t rv;
cgi_exec_info_t e_info;
conn_rec *c = r->connection;
if(strcmp(r->handler, CGI_MAGIC_TYPE) && strcmp(r->handler, "cgi-script"))
return DECLINED;
is_included = !strcmp(r->protocol, "INCLUDED");
p = r->main ? r->main->pool : r->pool;
argv0 = apr_filepath_name_get(r->filename);
nph = !(strncmp(argv0, "nph-", 4));
conf = ap_get_module_config(r->server->module_config, &cgi_module);
if (!(ap_allow_options(r) & OPT_EXECCGI) && !is_scriptaliased(r))
return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
"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 (r->finfo.filetype == 0)
return log_scripterror(r, conf, HTTP_NOT_FOUND, 0,
"script not found or unable to stat");
if (r->finfo.filetype == APR_DIR)
return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
"attempt to invoke directory as script");
if ((r->used_path_info == AP_REQ_REJECT_PATH_INFO) &&
r->path_info && *r->path_info)
{
/* default to accept */
return log_scripterror(r, conf, HTTP_NOT_FOUND, 0,
"AcceptPathInfo off disallows user's path");
}
/*
if (!ap_suexec_enabled) {
if (!ap_can_exec(&r->finfo))
return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
"file permissions deny server execution");
}
*/
ap_add_common_vars(r);
ap_add_cgi_vars(r);
e_info.process_cgi = 1;
e_info.cmd_type = APR_PROGRAM;
e_info.detached = 0;
e_info.in_pipe = APR_CHILD_BLOCK;
e_info.out_pipe = APR_CHILD_BLOCK;
e_info.err_pipe = APR_CHILD_BLOCK;
e_info.prog_type = RUN_AS_CGI;
e_info.bb = NULL;
e_info.ctx = NULL;
e_info.next = NULL;
e_info.addrspace = 0;
/* build the command line */
if ((rv = cgi_build_command(&command, &argv, r, p, &e_info)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"don't know how to spawn child process: %s",
r->filename);
return HTTP_INTERNAL_SERVER_ERROR;
}
/* run the script in its own process */
if ((rv = run_cgi_child(&script_out, &script_in, &script_err,
command, argv, r, p, &e_info)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"couldn't spawn child process: %s", r->filename);
return HTTP_INTERNAL_SERVER_ERROR;
}
/* Transfer any put/post args, CERN style...
* Note that we already ignore SIGPIPE in the core server.
*/
bb = apr_brigade_create(r->pool, c->bucket_alloc);
seen_eos = 0;
child_stopped_reading = 0;
if (conf->logname) {
dbuf = apr_palloc(r->pool, conf->bufbytes + 1);
dbpos = 0;
}
do {
apr_bucket *bucket;
rv = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES,
APR_BLOCK_READ, HUGE_STRING_LEN);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"Error reading request entity data");
return ap_map_http_request_error(rv, HTTP_BAD_REQUEST);
}
for (bucket = APR_BRIGADE_FIRST(bb);
bucket != APR_BRIGADE_SENTINEL(bb);
bucket = APR_BUCKET_NEXT(bucket))
{
const char *data;
apr_size_t len;
if (APR_BUCKET_IS_EOS(bucket)) {
seen_eos = 1;
break;
}
/* We can't do much with this. */
if (APR_BUCKET_IS_FLUSH(bucket)) {
continue;
}
/* If the child stopped, we still must read to EOS. */
if (child_stopped_reading) {
continue;
}
/* read */
apr_bucket_read(bucket, &data, &len, APR_BLOCK_READ);
if (conf->logname && dbpos < conf->bufbytes) {
int cursize;
if ((dbpos + len) > conf->bufbytes) {
cursize = conf->bufbytes - dbpos;
}
else {
cursize = len;
}
memcpy(dbuf + dbpos, data, cursize);
dbpos += cursize;
}
/* Keep writing data to the child until done or too much time
* elapses with no progress or an error occurs.
*/
rv = apr_file_write_full(script_out, data, len, NULL);
if (rv != APR_SUCCESS) {
/* silly script stopped reading, soak up remaining message */
child_stopped_reading = 1;
}
}
apr_brigade_cleanup(bb);
}
while (!seen_eos);
if (conf->logname) {
dbuf[dbpos] = '\0';
}
/* Is this flush really needed? */
apr_file_flush(script_out);
apr_file_close(script_out);
AP_DEBUG_ASSERT(script_in != NULL);
apr_brigade_cleanup(bb);
#if APR_FILES_AS_SOCKETS
apr_file_pipe_timeout_set(script_in, 0);
apr_file_pipe_timeout_set(script_err, 0);
b = cgi_bucket_create(r, script_in, script_err, c->bucket_alloc);
#else
b = apr_bucket_pipe_create(script_in, c->bucket_alloc);
#endif
APR_BRIGADE_INSERT_TAIL(bb, b);
b = apr_bucket_eos_create(c->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(bb, b);
/* Handle script return... */
if (!nph) {
const char *location;
char sbuf[MAX_STRING_LEN];
int ret;
if ((ret = ap_scan_script_header_err_brigade(r, bb, sbuf))) {
ret = log_script(r, conf, ret, dbuf, sbuf, bb, script_err);
/*
* ret could be HTTP_NOT_MODIFIED in the case that the CGI script
* does not set an explicit status and ap_meets_conditions, which
* is called by ap_scan_script_header_err_brigade, detects that
* the conditions of the requests are met and the response is
* not modified.
* In this case set r->status and return OK in order to prevent
* running through the error processing stack as this would
* break with mod_cache, if the conditions had been set by
* mod_cache itself to validate a stale entity.
* BTW: We circumvent the error processing stack anyway if the
* CGI script set an explicit status code (whatever it is) and
* the only possible values for ret here are:
*
* HTTP_NOT_MODIFIED (set by ap_meets_conditions)
* HTTP_PRECONDITION_FAILED (set by ap_meets_conditions)
* HTTP_INTERNAL_SERVER_ERROR (if something went wrong during the
* processing of the response of the CGI script, e.g broken headers
* or a crashed CGI process).
*/
if (ret == HTTP_NOT_MODIFIED) {
r->status = ret;
return OK;
}
return ret;
}
location = apr_table_get(r->headers_out, "Location");
if (location && r->status == 200) {
/* For a redirect whether internal or not, discard any
* remaining stdout from the script, and log any remaining
* stderr output, as normal. */
discard_script_output(bb);
apr_brigade_destroy(bb);
apr_file_pipe_timeout_set(script_err, r->server->timeout);
log_script_err(r, script_err);
}
if (location && location[0] == '/' && r->status == 200) {
/* 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;
}
rv = ap_pass_brigade(r->output_filters, bb);
}
else /* nph */ {
struct ap_filter_t *cur;
/* get rid of all filters up through protocol... since we
* haven't parsed off the headers, there is no way they can
* work
*/
cur = r->proto_output_filters;
while (cur && cur->frec->ftype < AP_FTYPE_CONNECTION) {
cur = cur->next;
}
r->output_filters = r->proto_output_filters = cur;
rv = ap_pass_brigade(r->output_filters, bb);
}
/* don't soak up script output if errors occurred writing it
* out... otherwise, we prolong the life of the script when the
* connection drops or we stopped sending output for some other
* reason */
if (rv == APR_SUCCESS && !r->connection->aborted) {
apr_file_pipe_timeout_set(script_err, r->server->timeout);
log_script_err(r, script_err);
}
apr_file_close(script_err);
return OK; /* NOT r->status, even if it has changed. */
}
/* copied from mod_cgi.c and slightly modified
* to work with fcgi_record types */
static
int fcgi_server_parse_headers(fcgi_request_t *fr, uint16_t request_id,
char **data)
{
request_rec *r = fr->r;
int ret, termarg;
if ((ret = ap_scan_script_header_err_strs(r, NULL, (const char **)data, &termarg, *data, NULL))) {
/*
* ret could be HTTP_NOT_MODIFIED in the case that the CGI script
* does not set an explicit status and ap_meets_conditions, which
* is called by ap_scan_script_header_err_brigade, detects that
* the conditions of the requests are met and the response is
* not modified.
* In this case set r->status and return OK in order to prevent
* running through the error processing stack as this would
* break with mod_cache, if the conditions had been set by
* mod_cache itself to validate a stale entity.
* BTW: We circumvent the error processing stack anyway if the
* CGI script set an explicit status code (whatever it is) and
* the only possible values for ret here are:
*
* HTTP_NOT_MODIFIED (set by ap_meets_conditions)
* HTTP_PRECONDITION_FAILED (set by ap_meets_conditions)
* HTTP_INTERNAL_SERVER_ERROR (if something went wrong during the
* processing of the response of the CGI script, e.g broken headers
* or a crashed CGI process).
*/
if (ret == HTTP_NOT_MODIFIED) {
r->status = ret;
return OK;
}
return ret;
}
const char *location = apr_table_get(r->headers_out, "Location");
#if 0
if (location && r->status == 200) {
/* For a redirect whether internal or not, discard any
* remaining stdout from the script, and log any remaining
* stderr output, as normal. */
discard_script_output(bb);
apr_brigade_destroy(bb);
apr_file_pipe_timeout_set(script_err, r->server->timeout);
log_script_err(r, script_err);
}
#endif
if (location && location[0] == '/' && r->status == 200) {
/* 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;
}
}
static int log_script(request_rec *r, cgi_server_conf * conf, int ret,
char *dbuf, const char *sbuf, apr_bucket_brigade *bb,
apr_file_t *script_err)
{
const apr_array_header_t *hdrs_arr = apr_table_elts(r->headers_in);
const apr_table_entry_t *hdrs = (const apr_table_entry_t *) hdrs_arr->elts;
char argsbuffer[HUGE_STRING_LEN];
apr_file_t *f = NULL;
apr_bucket *e;
const char *buf;
apr_size_t len;
apr_status_t rv;
int first;
int i;
apr_finfo_t finfo;
char time_str[APR_CTIME_LEN];
/* XXX Very expensive mainline case! Open, then getfileinfo! */
if (!conf->logname ||
((apr_stat(&finfo, conf->logname,
APR_FINFO_SIZE, r->pool) == APR_SUCCESS) &&
(finfo.size > conf->logbytes)) ||
(apr_file_open(&f, conf->logname,
APR_APPEND|APR_WRITE|APR_CREATE, APR_OS_DEFAULT,
r->pool) != APR_SUCCESS)) {
/* Soak up script output */
discard_script_output(bb);
log_script_err(r, script_err);
return ret;
}
/* "%% [Wed Jun 19 10:53:21 1996] GET /cgi-bin/printenv HTTP/1.0" */
apr_ctime(time_str, apr_time_now());
apr_file_printf(f, "%%%% [%s] %s %s%s%s %s\n", time_str, r->method, r->uri,
r->args ? "?" : "", r->args ? r->args : "", r->protocol);
/* "%% 500 /usr/local/apache/cgi-bin" */
apr_file_printf(f, "%%%% %d %s\n", ret, r->filename);
apr_file_puts("%request\n", f);
for (i = 0; i < hdrs_arr->nelts; ++i) {
if (!hdrs[i].key)
continue;
apr_file_printf(f, "%s: %s\n", hdrs[i].key, hdrs[i].val);
}
if ((r->method_number == M_POST || r->method_number == M_PUT) &&
*dbuf) {
apr_file_printf(f, "\n%s\n", dbuf);
}
apr_file_puts("%response\n", f);
hdrs_arr = apr_table_elts(r->err_headers_out);
hdrs = (const apr_table_entry_t *) hdrs_arr->elts;
for (i = 0; i < hdrs_arr->nelts; ++i) {
if (!hdrs[i].key)
continue;
apr_file_printf(f, "%s: %s\n", hdrs[i].key, hdrs[i].val);
}
if (sbuf && *sbuf)
apr_file_printf(f, "%s\n", sbuf);
first = 1;
for (e = APR_BRIGADE_FIRST(bb);
e != APR_BRIGADE_SENTINEL(bb);
e = APR_BUCKET_NEXT(e))
{
if (APR_BUCKET_IS_EOS(e)) {
break;
}
rv = apr_bucket_read(e, &buf, &len, APR_BLOCK_READ);
if (rv != APR_SUCCESS || (len == 0)) {
break;
}
if (first) {
apr_file_puts("%stdout\n", f);
first = 0;
}
apr_file_write(f, buf, &len);
apr_file_puts("\n", f);
}
if (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_err) == APR_SUCCESS) {
apr_file_puts("%stderr\n", f);
apr_file_puts(argsbuffer, f);
while (apr_file_gets(argsbuffer, HUGE_STRING_LEN,
script_err) == APR_SUCCESS) {
apr_file_puts(argsbuffer, f);
}
apr_file_puts("\n", f);
}
apr_brigade_destroy(bb);
apr_file_close(script_err);
apr_file_close(f);
return ret;
}
