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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/* Cherokee
*
* Authors:
* Alvaro Lopez Ortega <alvaro@alobbs.com>
*
* Copyright (C) 2001-2013 Alvaro Lopez Ortega
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/

#include "common-internal.h"

#include <fcntl.h>

#include "handler_fcgi.h"
#include "header.h"
#include "connection-protected.h"
#include "util.h"
#include "thread.h"
#include "source_interpreter.h"
#include "bogotime.h"
#include "error_log.h"

#include "fastcgi.h"

#define POST_PACKAGE_LEN 32600
#define ENTRIES "fcgi,handler"


#define set_env(cgi,key,val,len) \
set_env_pair (cgi, key, sizeof(key)-1, val, len)


static void set_env_pair (cherokee_handler_cgi_base_t *cgi_base,
const char *key, int key_len,
const char *val, int val_len);

/* Plug-in initialization
*/
CGI_LIB_INIT (fcgi, http_all_methods);


/* Methods implementation
*/
static ret_t
process_package (cherokee_handler_fcgi_t *hdl, cherokee_buffer_t *inbuf, cherokee_buffer_t *outbuf)
{
FCGI_Header *header;
cuint_t len;
char *data;
cuint_t type;
cuint_t id;
cuint_t padding;

/* Is there enough information?
*/
if (inbuf->len < sizeof(FCGI_Header))
return ret_ok;

/* At least there is a header
*/
header = (FCGI_Header *)inbuf->buf;

if (header->version != 1) {
cherokee_buffer_print_debug (inbuf, -1);
LOG_ERROR_S (CHEROKEE_ERROR_HANDLER_FCGI_VERSION);
return ret_error;
}

if (header->type != FCGI_STDERR &&
header->type != FCGI_STDOUT &&
header->type != FCGI_END_REQUEST) {
cherokee_buffer_print_debug (inbuf, -1);
LOG_ERROR_S (CHEROKEE_ERROR_HANDLER_FCGI_PARSING);
return ret_error;
}

/* Read the header
*/
type = header->type;
padding = header->paddingLength;
id = (header->requestIdB0 | (header->requestIdB1 << 8));
len = (header->contentLengthB0 | (header->contentLengthB1 << 8));
data = inbuf->buf + FCGI_HEADER_LEN;

/* printf ("have %d, hdr=%d exp_len=%d pad=%d\n", inbuf->len, FCGI_HEADER_LEN, len, padding); */

/* Is the package complete?
*/
if (len + padding > inbuf->len - FCGI_HEADER_LEN) {
/* printf ("Incomplete: %d < %d\n", len + padding, inbuf->len - FCGI_HEADER_LEN); */
return ret_ok;
}

/* It has received the full package content
*/
switch (type) {
case FCGI_STDERR:
/* printf ("READ:STDERR (%d): %s", len, data?data:""); */

LOG_ERROR (CHEROKEE_ERROR_HANDLER_FCGI_STDERR, data);

/* Debug mode */
if (SOURCE_INT(hdl->src_ref)->debug) {
PRINT_MSG ("%.*s\n", len, data);
}

break;

case FCGI_STDOUT:
/* printf ("READ:STDOUT eof=%d: %d", HDL_CGI_BASE(hdl)->got_eof, len); */
cherokee_buffer_add (outbuf, data, len);
break;

case FCGI_END_REQUEST:
/* printf ("READ:END"); */
HDL_CGI_BASE(hdl)->got_eof = true;
break;

default:
SHOULDNT_HAPPEN;
}

cherokee_buffer_move_to_begin (inbuf, len + FCGI_HEADER_LEN + padding);
/* printf ("- FCGI left %d\n", inbuf->len); */
return ret_eagain;
}


static ret_t
process_buffer (cherokee_handler_fcgi_t *hdl, cherokee_buffer_t *inbuf, cherokee_buffer_t *outbuf)
{
ret_t ret;

do {
ret = process_package (hdl, inbuf, outbuf);
} while (ret == ret_eagain);

if (ret == ret_ok) {
if (cherokee_buffer_is_empty (outbuf))
return (HDL_CGI_BASE(hdl)->got_eof) ? ret_eof : ret_eagain;
}

return ret;
}

static ret_t
read_from_fcgi (cherokee_handler_cgi_base_t *cgi, cherokee_buffer_t *buffer)
{
ret_t ret;
size_t read = 0;
cherokee_handler_fcgi_t *fcgi = HDL_FCGI(cgi);

ret = cherokee_socket_bufread (&fcgi->socket, &fcgi->write_buffer, DEFAULT_READ_SIZE, &read);

switch (ret) {
case ret_eagain:
ret = cherokee_thread_deactive_to_polling (HANDLER_THREAD(cgi), HANDLER_CONN(cgi),
fcgi->socket.socket, FDPOLL_MODE_READ,
false);
if (unlikely (ret != ret_ok)) {
cgi->got_eof = true;
return ret_error;
}
return ret_eagain;

case ret_ok:
ret = process_buffer (fcgi, &fcgi->write_buffer, buffer);
TRACE (ENTRIES, "%d bytes read, buffer.len %d\n", read, buffer->len);

if ((ret == ret_ok) && cgi->got_eof && (buffer->len > 0)) {
return ret_eof_have_data;
}
return ret;

case ret_eof:
case ret_error:
cgi->got_eof = true;
return ret;

default:
RET_UNKNOWN(ret);
}

SHOULDNT_HAPPEN;
return ret_error;
}


static ret_t
props_free (cherokee_handler_fcgi_props_t *props)
{
if (props->balancer != NULL)
cherokee_balancer_free (props->balancer);

return cherokee_handler_cgi_base_props_free (PROP_CGI_BASE(props));
}


ret_t
cherokee_handler_fcgi_configure (cherokee_config_node_t *conf,
cherokee_server_t *srv,
cherokee_module_props_t **_props)
{
ret_t ret;
cherokee_list_t *i;
cherokee_handler_fcgi_props_t *props;

/* Instance a new property object
*/
if (*_props == NULL) {
CHEROKEE_NEW_STRUCT (n, handler_fcgi_props);

cherokee_handler_cgi_base_props_init_base (PROP_CGI_BASE(n),
MODULE_PROPS_FREE(props_free));

n->balancer = NULL;

*_props = MODULE_PROPS(n);
}

props = PROP_FCGI(*_props);

/* Parse the configuration tree
*/
cherokee_config_node_foreach (i, conf) {
cherokee_config_node_t *subconf = CONFIG_NODE(i);

if (equal_buf_str (&subconf->key, "balancer")) {
ret = cherokee_balancer_instance (&subconf->val, subconf, srv, &props->balancer);
if (ret != ret_ok) return ret;
}
}

/* Init base class
*/
ret = cherokee_handler_cgi_base_configure (conf, srv, _props);
if (ret != ret_ok) return ret;

/* Final checks
*/
if (props->balancer == NULL) {
LOG_CRITICAL_S (CHEROKEE_ERROR_HANDLER_FCGI_BALANCER);
return ret_error;
}

return ret_ok;
}


ret_t
cherokee_handler_fcgi_new (cherokee_handler_t **hdl, void *cnt, cherokee_module_props_t *props)
{
CHEROKEE_NEW_STRUCT (n, handler_fcgi);

/* Init the base class
*/
cherokee_handler_cgi_base_init (HDL_CGI_BASE(n), cnt, PLUGIN_INFO_HANDLER_PTR(fcgi),
HANDLER_PROPS(props), set_env_pair, read_from_fcgi);

/* Virtual methods
*/
MODULE(n)->init = (handler_func_init_t) cherokee_handler_fcgi_init;
MODULE(n)->free = (module_func_free_t) cherokee_handler_fcgi_free;
HANDLER(n)->read_post = (handler_func_read_post_t) cherokee_handler_fcgi_read_post;

/* Virtual methods: implemented by handler_cgi_base
*/
HANDLER(n)->add_headers = (handler_func_add_headers_t) cherokee_handler_cgi_base_add_headers;
HANDLER(n)->step = (handler_func_step_t) cherokee_handler_cgi_base_step;

/* Properties
*/
n->post_phase = fcgi_post_phase_read;
n->src_ref = NULL;

cherokee_socket_init (&n->socket);
cherokee_buffer_init (&n->write_buffer);
cherokee_buffer_ensure_size (&n->write_buffer, 512);

/* Return the object
*/
*hdl = HANDLER(n);
return ret_ok;
}


ret_t
cherokee_handler_fcgi_free (cherokee_handler_fcgi_t *hdl)
{
TRACE (ENTRIES, "fcgi handler free: %p\n", hdl);

cherokee_socket_close (&hdl->socket);
cherokee_socket_mrproper (&hdl->socket);

cherokee_buffer_mrproper (&hdl->write_buffer);

return cherokee_handler_cgi_base_free (HDL_CGI_BASE(hdl));
}


static void
fcgi_build_header (FCGI_Header *hdr, cuchar_t type, cushort_t request_id, cuint_t content_length, cuchar_t padding)
{
hdr->version = FCGI_VERSION_1;
hdr->type = type;
hdr->requestIdB0 = (cuchar_t) request_id;
hdr->requestIdB1 = (cuchar_t) (request_id >> 8) & 0xff;
hdr->contentLengthB0 = (cuchar_t) (content_length % 256);
hdr->contentLengthB1 = (cuchar_t) (content_length / 256);
hdr->paddingLength = padding;
hdr->reserved = 0;
}

static void
fcgi_build_request_body (FCGI_BeginRequestRecord *request)
{
request->body.roleB0 = FCGI_RESPONDER;
request->body.roleB1 = 0;
request->body.flags = 0;
request->body.reserved[0] = 0;
request->body.reserved[1] = 0;
request->body.reserved[2] = 0;
request->body.reserved[3] = 0;
request->body.reserved[4] = 0;
}

static void
set_env_pair (cherokee_handler_cgi_base_t *cgi_base,
const char *key, int key_len,
const char *val, int val_len)
{
int len;
FCGI_BeginRequestRecord request;
cherokee_handler_fcgi_t *hdl = HDL_FCGI(cgi_base);
cherokee_buffer_t *buf = &hdl->write_buffer;

#ifdef TRACE_ENABLED
cherokee_buffer_t *tmp = &HANDLER_THREAD(cgi_base)->tmp_buf2;

cherokee_buffer_clean (tmp);
cherokee_buffer_add (tmp, key, key_len);
cherokee_buffer_add_str (tmp, " = \"");
cherokee_buffer_add (tmp, val, val_len);
cherokee_buffer_add_str (tmp, "\"\n");

TRACE (ENTRIES, "%s", tmp->buf);
#endif

len = key_len + val_len;
len += key_len > 127 ? 4 : 1;
len += val_len > 127 ? 4 : 1;

fcgi_build_header (&request.header, FCGI_PARAMS, 1, len, 0);

cherokee_buffer_ensure_size (buf, buf->len + sizeof(FCGI_Header) + key_len + val_len);
cherokee_buffer_add (buf, (void *)&request.header, sizeof(FCGI_Header));

if (key_len <= 127) {
buf->buf[buf->len++] = key_len;
} else {
buf->buf[buf->len++] = ((key_len >> 24) & 0xff) | 0x80;
buf->buf[buf->len++] = (key_len >> 16) & 0xff;
buf->buf[buf->len++] = (key_len >> 8) & 0xff;
buf->buf[buf->len++] = (key_len >> 0) & 0xff;
}

if (val_len <= 127) {
buf->buf[buf->len++] = val_len;
} else {
buf->buf[buf->len++] = ((val_len >> 24) & 0xff) | 0x80;
buf->buf[buf->len++] = (val_len >> 16) & 0xff;
buf->buf[buf->len++] = (val_len >> 8) & 0xff;
buf->buf[buf->len++] = (val_len >> 0) & 0xff;
}

cherokee_buffer_add (buf, key, key_len);
cherokee_buffer_add (buf, val, val_len);
}


static ret_t
add_extra_fcgi_env (cherokee_handler_fcgi_t *hdl, cuint_t *last_header_offset)
{
cherokee_handler_cgi_base_t *cgi_base = HDL_CGI_BASE(hdl);
cherokee_buffer_t buffer = CHEROKEE_BUF_INIT;
cherokee_connection_t *conn = HANDLER_CONN(hdl);
cherokee_handler_cgi_base_props_t *props = HANDLER_CGI_BASE_PROPS(hdl);

/* POST management
*/
if (conn->post.has_info) {
if (conn->post.encoding == post_enc_regular) {
cherokee_buffer_add_ullong10 (&buffer, conn->post.len);
set_env (cgi_base, "CONTENT_LENGTH", buffer.buf, buffer.len);

} else if (conn->post.encoding == post_enc_chunked) {
TRACE (ENTRIES",post", "Setting Chunked Post: %s flag\n", "retransmit");
set_env (cgi_base, "CONTENT_TRANSFER_ENCODING", "chunked", 7);
conn->post.chunked.retransmit = true;
}
}

/* MIND THIS: _Last_ entry
*/
*last_header_offset = hdl->write_buffer.len;


/* SCRIPT_FILENAME = Virtual-to-physical mapping for SCRIPT_NAME.
*
* Example:
* http://host/folder/script.php/extra?a=b
* Document Root=/docroot
*
* SCRIPT_FILENAME = /docroot/script.php
*/
if (cgi_base->executable.len > 0) {
set_env (cgi_base, "SCRIPT_FILENAME",
cgi_base->executable.buf,
cgi_base->executable.len);
} else {
cherokee_buffer_clean (&buffer);

if (props->check_file) {
cherokee_buffer_add_buffer (&buffer, &CONN_VSRV(conn)->root);
cherokee_buffer_add_buffer (&buffer, &conn->request);
} else {
cherokee_buffer_add_buffer (&buffer, &conn->request);
}

set_env (cgi_base, "SCRIPT_FILENAME", buffer.buf, buffer.len);
}

cherokee_buffer_mrproper (&buffer);
return ret_ok;
}


static void
fixup_padding (cherokee_buffer_t *buf, cuint_t last_header_offset)
{
cuint_t rest;
cuint_t pad;
static char padding[8] = {0, 0, 0, 0, 0, 0, 0, 0};
FCGI_Header *last_header;

if (buf->len <= 0)
return;
last_header = (FCGI_Header *) (buf->buf + last_header_offset);
rest = buf->len % 8;
pad = 8 - rest;

if (rest == 0)
return;

last_header->paddingLength = pad;

cherokee_buffer_ensure_size (buf, buf->len + pad);
cherokee_buffer_add (buf, padding, pad);
}

static void
add_empty_packet (cherokee_handler_fcgi_t *hdl, cuint_t type)
{
FCGI_BeginRequestRecord request;

fcgi_build_header (&request.header, type, 1, 0, 0);
cherokee_buffer_add (&hdl->write_buffer, (void *)&request.header, sizeof(FCGI_Header));

TRACE (ENTRIES, "empty packet type=%d, len=%d\n", type, hdl->write_buffer.len);
}


static ret_t
build_header (cherokee_handler_fcgi_t *hdl, cherokee_buffer_t *buffer)
{
FCGI_BeginRequestRecord request;
cuint_t last_header_offset;
cherokee_connection_t *conn = HANDLER_CONN(hdl);

cherokee_buffer_clean (buffer);

/* FCGI_BEGIN_REQUEST
*/
fcgi_build_header (&request.header, FCGI_BEGIN_REQUEST, 1, sizeof(request.body), 0);
fcgi_build_request_body (&request);

cherokee_buffer_add (buffer, (void *)&request, sizeof(FCGI_BeginRequestRecord));
TRACE (ENTRIES, "Added FCGI_BEGIN_REQUEST, len=%d\n", buffer->len);

/* Add enviroment variables
*/
cherokee_handler_cgi_base_build_envp (HDL_CGI_BASE(hdl), conn);

add_extra_fcgi_env (hdl, &last_header_offset);
fixup_padding (buffer, last_header_offset);

/* There are no more parameters
*/
add_empty_packet (hdl, FCGI_PARAMS);

/* No POST?
*/
if ((! conn->post.has_info) || (! conn->post.len)) {
TRACE (ENTRIES",post", "Post: %s\n", "has no post");
add_empty_packet (hdl, FCGI_STDIN);
}

TRACE (ENTRIES, "Added FCGI_PARAMS, len=%d\n", buffer->len);
return ret_ok;
}


static ret_t
connect_to_server (cherokee_handler_fcgi_t *hdl)
{
ret_t ret;
cherokee_connection_t *conn = HANDLER_CONN(hdl);
cherokee_handler_fcgi_props_t *props = HANDLER_FCGI_PROPS(hdl);

/* Get a reference to the target host
*/
if (hdl->src_ref == NULL) {
ret = cherokee_balancer_dispatch (props->balancer, conn, &hdl->src_ref);
if (ret != ret_ok)
return ret;
}

/* Try to connect
*/
if (hdl->src_ref->type == source_host) {
ret = cherokee_source_connect_polling (hdl->src_ref, &hdl->socket, conn);
if ((ret == ret_deny) || (ret == ret_error))
{
cherokee_balancer_report_fail (props->balancer, conn, hdl->src_ref);
}
} else {
ret = cherokee_source_interpreter_connect_polling (SOURCE_INT(hdl->src_ref),
&hdl->socket, conn);
}

return ret;
}


static ret_t
do_send (cherokee_handler_fcgi_t *hdl,
cherokee_buffer_t *buffer)
{
ret_t ret;
size_t written = 0;
cherokee_connection_t *conn = HANDLER_CONN(hdl);

ret = cherokee_socket_bufwrite (&hdl->socket, buffer, &written);
switch (ret) {
case ret_ok:
break;
case ret_eagain:
if (written > 0)
break;
return ret_eagain;
default:
conn->error_code = http_bad_gateway;
return ret_error;
}

cherokee_buffer_move_to_begin (buffer, written);
TRACE (ENTRIES, "sent=%d, remaining=%d\n", written, buffer->len);

return ret_ok;
}


static ret_t
send_post (cherokee_handler_fcgi_t *hdl,
cherokee_buffer_t *buf)
{
ret_t ret;
int prev_buf_len;
cherokee_connection_t *conn = HANDLER_CONN(hdl);
static FCGI_Header empty_header = {0,0,0,0,0,0,0,0};

switch (hdl->post_phase) {
case fcgi_post_phase_read:
TRACE (ENTRIES",post", "Post %s\n", "read");

/* Add space for the header, it'll filled out later on..
*/
if (cherokee_buffer_is_empty (buf)) {
cherokee_buffer_add (buf, (const char *)&empty_header, sizeof (FCGI_Header));
}

/* Take a chunck of post
*/
ret = cherokee_post_read (&conn->post, &conn->socket, buf);
if (ret != ret_ok) {
return ret;
}

TRACE (ENTRIES",post", "Post buffer.len %d\n", buf->len);

/* Did something, increase timeout
*/
cherokee_connection_update_timeout (conn);

/* Complete the header
*/
if (buf->len > sizeof(FCGI_Header)) {
fcgi_build_header ((FCGI_Header *)buf->buf, FCGI_STDIN, 1,
buf->len - sizeof(FCGI_Header), 0);
}

/* Close STDIN if it was the last chunck
*/
if (cherokee_post_read_finished (&conn->post)) {
add_empty_packet (hdl, FCGI_STDIN);
}

hdl->post_phase = fcgi_post_phase_write;

case fcgi_post_phase_write:
TRACE (ENTRIES",post", "Post write, buf.len=%d (header len %d)\n", buf->len, sizeof(FCGI_Header));

if (! cherokee_buffer_is_empty (buf)) {
prev_buf_len = buf->len;

ret = do_send (hdl, buf);
switch (ret) {
                        case ret_ok:
/* Did something, increase timeout
*/
if (buf->len < prev_buf_len) {
cherokee_connection_update_timeout (conn);
}

/* Block on back-end write
*/
if (buf->len > 0) {
return ret_deny;
}
                                break;
                        case ret_eagain:
/* EAGAIN on write */
return ret_deny;
                        case ret_eof:
                        case ret_error:
                                return ret_error;
                        default:
RET_UNKNOWN(ret);
return ret_error;
                        }
}

/* Next iteration
*/
if (! cherokee_buffer_is_empty (buf)) {
cherokee_thread_deactive_to_polling (HANDLER_THREAD(hdl),
HANDLER_CONN(hdl),
hdl->socket.socket,
FDPOLL_MODE_WRITE, false);
return ret_deny;
}

if (! cherokee_post_read_finished (&conn->post)) {
hdl->post_phase = fcgi_post_phase_read;
return ret_eagain;
}

TRACE (ENTRIES",post", "Post %s\n", "finished");
return ret_ok;

default:
SHOULDNT_HAPPEN;
}

return ret_error;
}


ret_t
cherokee_handler_fcgi_init (cherokee_handler_fcgi_t *hdl)
{
ret_t ret;
cherokee_connection_t *conn = HANDLER_CONN(hdl);
cherokee_handler_cgi_base_props_t *props = HANDLER_CGI_BASE_PROPS(hdl);

switch (HDL_CGI_BASE(hdl)->init_phase) {
case hcgi_phase_build_headers:
TRACE (ENTRIES, "Init: %s\n", "begins");

/* Extracts PATH_INFO and filename from request uri
*/
ret = cherokee_handler_cgi_base_extract_path (HDL_CGI_BASE(hdl), props->check_file);
if (unlikely (ret < ret_ok)) return ret;

/* Build the headers
*/
ret = build_header (hdl, &hdl->write_buffer);
if (unlikely (ret != ret_ok)) return ret;

HDL_CGI_BASE(hdl)->init_phase = hcgi_phase_connect;

case hcgi_phase_connect:
TRACE (ENTRIES, "Init: %s\n", "connect");

  /* Connect
*/
ret = connect_to_server (hdl);
switch (ret) {
case ret_ok:
break;
case ret_eagain:
return ret_eagain;
case ret_deny:
conn->error_code = http_gateway_timeout;
return ret_error;
default:
conn->error_code = http_service_unavailable;
return ret_error;
}

HDL_CGI_BASE(hdl)->init_phase = hcgi_phase_send_headers;

case hcgi_phase_send_headers:
TRACE (ENTRIES, "Init: %s\n", "send_headers");

/* Send the header
*/
ret = do_send (hdl, &hdl->write_buffer);
if (ret != ret_ok) {
return ret;
}

if (! cherokee_buffer_is_empty (&hdl->write_buffer)) {
return ret_eagain;
}

break;
}

TRACE (ENTRIES, "Init %s\n", "finishes");

cherokee_buffer_clean (&hdl->write_buffer);
return ret_ok;
}


ret_t
cherokee_handler_fcgi_read_post (cherokee_handler_fcgi_t *hdl)
{
return send_post (hdl, &hdl->write_buffer);
}
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