/*
   +----------------------------------------------------------------------+
   | Copyright © The PHP Group and Contributors.                          |
   +----------------------------------------------------------------------+
   | This source file is subject to the Modified BSD License that is      |
   | bundled with this package in the file LICENSE, and is available      |
   | through the World Wide Web at <https://www.php.net/license/>.        |
   |                                                                      |
   | SPDX-License-Identifier: BSD-3-Clause                                |
   +----------------------------------------------------------------------+
   | Original design:  Shane Caraveo <shane@caraveo.com>                  |
   | Authors: Andi Gutmans <andi@php.net>                                 |
   |          Zeev Suraski <zeev@php.net>                                 |
   +----------------------------------------------------------------------+
*/

#include <ctype.h>
#include <sys/stat.h>
#include <locale.h>

#include "php.h"
#include "SAPI.h"
#include "php_variables.h"
#include "php_ini.h"
#ifdef ZTS
#include "TSRM.h"
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#elif defined(PHP_WIN32)
#include "win32/time.h"
#endif

#include "rfc1867.h"

#include "php_content_types.h"

#ifdef ZTS
SAPI_API int sapi_globals_id;
SAPI_API size_t sapi_globals_offset;
#else
sapi_globals_struct sapi_globals;
#endif

static void _type_dtor(zval *zv)
{
	free(Z_PTR_P(zv));
}

static void sapi_globals_ctor(sapi_globals_struct *sapi_globals)
{
	memset(sapi_globals, 0, sizeof(*sapi_globals));
	zend_hash_init(&sapi_globals->known_post_content_types, 8, NULL, _type_dtor, 1);
	php_setup_sapi_content_types();
}

static void sapi_globals_dtor(sapi_globals_struct *sapi_globals)
{
	zend_hash_destroy(&sapi_globals->known_post_content_types);
}

/* True globals (no need for thread safety) */
SAPI_API sapi_module_struct sapi_module;


SAPI_API void sapi_startup(sapi_module_struct *sf)
{
	sf->ini_entries = NULL;
	sapi_module = *sf;

#ifdef ZTS
	ts_allocate_fast_id(&sapi_globals_id, &sapi_globals_offset, sizeof(sapi_globals_struct), (ts_allocate_ctor) sapi_globals_ctor, (ts_allocate_dtor) sapi_globals_dtor);
# ifdef PHP_WIN32
	_configthreadlocale(_ENABLE_PER_THREAD_LOCALE);
# endif
#else
	sapi_globals_ctor(&sapi_globals);
#endif

#ifdef PHP_WIN32
	tsrm_win32_startup();
#endif

	reentrancy_startup();
}

SAPI_API void sapi_shutdown(void)
{
#ifdef ZTS
	ts_free_id(sapi_globals_id);
#else
	sapi_globals_dtor(&sapi_globals);
#endif

	reentrancy_shutdown();

#ifdef PHP_WIN32
	tsrm_win32_shutdown();
#endif
}


SAPI_API void sapi_free_header(sapi_header_struct *sapi_header)
{
	efree(sapi_header->header);
}

/* {{{ call a header function */
PHP_FUNCTION(header_register_callback)
{
	zend_fcall_info fci;
	zend_fcall_info_cache fcc;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "f", &fci, &fcc) == FAILURE) {
		RETURN_THROWS();
	}

	if (Z_TYPE(SG(callback_func)) != IS_UNDEF) {
		zval_ptr_dtor(&SG(callback_func));
		SG(fci_cache) = empty_fcall_info_cache;
	}

	/* Don't store callback if headers have already been sent:
	 * It won't get used and we won't have a chance to release it. */
	if (!SG(headers_sent)) {
		ZVAL_COPY(&SG(callback_func), &fci.function_name);
	}

	RETURN_TRUE;
}
/* }}} */

static void sapi_run_header_callback(zval *callback)
{
	int   error;
	zend_fcall_info fci;
	char *callback_error = NULL;
	zval retval;

	if (zend_fcall_info_init(callback, 0, &fci, &SG(fci_cache), NULL, &callback_error) == SUCCESS) {
		fci.retval = &retval;

		error = zend_call_function(&fci, &SG(fci_cache));
		if (error == FAILURE) {
			goto callback_failed;
		} else {
			zval_ptr_dtor(&retval);
		}
	} else {
callback_failed:
		php_error_docref(NULL, E_WARNING, "Could not call the sapi_header_callback");
	}

	if (callback_error) {
		efree(callback_error);
	}
}

SAPI_API void sapi_handle_post(void *arg)
{
	if (SG(request_info).post_entry && SG(request_info).content_type_dup) {
		SG(request_info).post_entry->post_handler(SG(request_info).content_type_dup, arg);
		efree(SG(request_info).content_type_dup);
		SG(request_info).content_type_dup = NULL;
	}
}

SAPI_API void sapi_read_post_data(void)
{
	sapi_post_entry *post_entry;
	uint32_t content_type_length = (uint32_t)strlen(SG(request_info).content_type);
	char *content_type = estrndup(SG(request_info).content_type, content_type_length);
	char *p;
	char oldchar=0;
	void (*post_reader_func)(void) = NULL;


	/* dedicated implementation for increased performance:
	 * - Make the content type lowercase
	 * - Trim descriptive data, stay with the content-type only
	 */
	for (p = content_type; p < content_type + content_type_length; p++) {
		switch (*p) {
			case ';':
			case ',':
			case ' ':
				content_type_length = p-content_type;
				oldchar = *p;
				*p = 0;
				break;
			default:
				*p = tolower((unsigned char)*p);
				break;
		}
	}

	/* now try to find an appropriate POST content handler */
	if ((post_entry = zend_hash_str_find_ptr(&SG(known_post_content_types), content_type,
			content_type_length)) != NULL) {
		/* found one, register it for use */
		SG(request_info).post_entry = post_entry;
		post_reader_func = post_entry->post_reader;
	} else {
		/* fallback */
		SG(request_info).post_entry = NULL;
		if (UNEXPECTED(!sapi_module.default_post_reader)) {
			/* this should not happen as there should always be a default_post_reader */
			SG(request_info).content_type_dup = NULL;
			sapi_module.sapi_error(E_WARNING, "Unsupported content type:  '%s'", content_type);
			efree(content_type);
			return;
		}
	}
	if (oldchar) {
		*(p-1) = oldchar;
	}

	/* the content_type_dup is not set at this stage so no need to try to free it first */
	SG(request_info).content_type_dup = content_type;

	if(post_reader_func) {
		post_reader_func();
	}

	if(sapi_module.default_post_reader) {
		sapi_module.default_post_reader();
	}
}

SAPI_API size_t sapi_read_post_block(char *buffer, size_t buflen)
{
	size_t read_bytes;

	if (!sapi_module.read_post) {
		return 0;
	}

	read_bytes = sapi_module.read_post(buffer, buflen);

	if (read_bytes > 0) {
		/* gogo */
		SG(read_post_bytes) += read_bytes;
	}
	if (read_bytes < buflen) {
		/* done */
		SG(post_read) = 1;
	}

	return read_bytes;
}

SAPI_API SAPI_POST_READER_FUNC(sapi_read_standard_form_data)
{
	zend_long post_max_size = REQUEST_PARSE_BODY_OPTION_GET(post_max_size, SG(post_max_size));

	if (post_max_size > 0 && SG(request_info).content_length > post_max_size) {
		php_error_docref(NULL, E_WARNING, "POST Content-Length of " ZEND_LONG_FMT " bytes exceeds the limit of " ZEND_LONG_FMT " bytes",
					SG(request_info).content_length, post_max_size);
		return;
	}


	SG(request_info).request_body = php_stream_temp_create_ex(TEMP_STREAM_DEFAULT, SAPI_POST_BLOCK_SIZE, PG(upload_tmp_dir));

	if (sapi_module.read_post) {
		size_t read_bytes;

		for (;;) {
			char buffer[SAPI_POST_BLOCK_SIZE];

			read_bytes = sapi_read_post_block(buffer, SAPI_POST_BLOCK_SIZE);

			if (read_bytes > 0) {
				if (php_stream_write(SG(request_info).request_body, buffer, read_bytes) != read_bytes) {
					/* if parts of the stream can't be written, purge it completely */
					php_stream_truncate_set_size(SG(request_info).request_body, 0);
					php_error_docref(NULL, E_WARNING, "POST data can't be buffered; all data discarded");
					break;
				}
			}

			if (post_max_size > 0 && SG(read_post_bytes) > post_max_size) {
				php_error_docref(NULL, E_WARNING, "Actual POST length does not match Content-Length, and exceeds " ZEND_LONG_FMT " bytes", post_max_size);
				break;
			}

			if (read_bytes < SAPI_POST_BLOCK_SIZE) {
				/* done */
				break;
			}
		}
		php_stream_rewind(SG(request_info).request_body);
	}
}


static inline char *get_default_content_type(uint32_t prefix_len, uint32_t *len)
{
	char *mimetype, *charset, *content_type;
	uint32_t mimetype_len, charset_len;

	if (SG(default_mimetype)) {
		mimetype = SG(default_mimetype);
		mimetype_len = (uint32_t)strlen(SG(default_mimetype));
	} else {
		mimetype = SAPI_DEFAULT_MIMETYPE;
		mimetype_len = sizeof(SAPI_DEFAULT_MIMETYPE) - 1;
	}
	if (SG(default_charset)) {
		charset = SG(default_charset);
		charset_len = (uint32_t)strlen(SG(default_charset));
	} else {
		charset = SAPI_DEFAULT_CHARSET;
		charset_len = sizeof(SAPI_DEFAULT_CHARSET) - 1;
	}

	if (*charset && strncasecmp(mimetype, "text/", 5) == 0) {
		char *p;

		*len = prefix_len + mimetype_len + sizeof("; charset=") - 1 + charset_len;
		content_type = (char*)emalloc(*len + 1);
		p = content_type + prefix_len;
		p = zend_mempcpy(p, mimetype, mimetype_len);
		p = zend_mempcpy(p, "; charset=", sizeof("; charset=") - 1);
		memcpy(p, charset, charset_len + 1);
	} else {
		*len = prefix_len + mimetype_len;
		content_type = (char*)emalloc(*len + 1);
		memcpy(content_type + prefix_len, mimetype, mimetype_len + 1);
	}
	return content_type;
}


SAPI_API char *sapi_get_default_content_type(void)
{
	uint32_t len;

	return get_default_content_type(0, &len);
}


SAPI_API void sapi_get_default_content_type_header(sapi_header_struct *default_header)
{
	uint32_t len;

	default_header->header = get_default_content_type(sizeof("Content-type: ")-1, &len);
	default_header->header_len = len;
	memcpy(default_header->header, "Content-type: ", sizeof("Content-type: ") - 1);
}

/*
 * Add charset on content-type header if the MIME type starts with
 * "text/", the default_charset directive is not empty and
 * there is not already a charset option in there.
 *
 * If "mimetype" is non-NULL, it should point to a pointer allocated
 * with emalloc(). If a charset is added, the string will be
 * re-allocated and the new length is returned.  If mimetype is
 * unchanged, 0 is returned.
 *
 */
SAPI_API size_t sapi_apply_default_charset(char **mimetype, size_t len)
{
	char *charset, *newtype;
	size_t newlen;
	charset = SG(default_charset) ? SG(default_charset) : SAPI_DEFAULT_CHARSET;

	if (*mimetype != NULL) {
		if (*charset && strncmp(*mimetype, "text/", 5) == 0 && strstr(*mimetype, "charset=") == NULL) {
			newlen = len + (sizeof(";charset=")-1) + strlen(charset);
			newtype = emalloc(newlen + 1);
	 		PHP_STRLCPY(newtype, *mimetype, newlen + 1, len);
			strlcat(newtype, ";charset=", newlen + 1);
			strlcat(newtype, charset, newlen + 1);
			efree(*mimetype);
			*mimetype = newtype;
			return newlen;
		}
	}
	return 0;
}

SAPI_API void sapi_activate_headers_only(void)
{
	if (SG(request_info).headers_read == 1)
		return;
	SG(request_info).headers_read = 1;
	zend_llist_init(&SG(sapi_headers).headers, sizeof(sapi_header_struct),
			(void (*)(void *)) sapi_free_header, 0);
	SG(sapi_headers).send_default_content_type = 1;

	/* SG(sapi_headers).http_response_code = 200; */
	SG(sapi_headers).http_status_line = NULL;
	SG(sapi_headers).mimetype = NULL;
	SG(read_post_bytes) = 0;
	SG(request_info).request_body = NULL;
	SG(request_info).current_user = NULL;
	SG(request_info).current_user_length = 0;
	SG(request_info).no_headers = 0;
	SG(request_info).post_entry = NULL;
	SG(global_request_time) = 0;

	/*
	 * It's possible to override this general case in the activate() callback,
	 * if necessary.
	 */
	if (SG(request_info).request_method && !strcmp(SG(request_info).request_method, "HEAD")) {
		SG(request_info).headers_only = 1;
	} else {
		SG(request_info).headers_only = 0;
	}
	if (SG(server_context)) {
		SG(request_info).cookie_data = sapi_module.read_cookies();
		if (sapi_module.activate) {
			sapi_module.activate();
		}
	}
	if (sapi_module.input_filter_init ) {
		sapi_module.input_filter_init();
	}
}

/*
 * Called from php_request_startup() for every request.
 */

SAPI_API void sapi_activate(void)
{
	zend_llist_init(&SG(sapi_headers).headers, sizeof(sapi_header_struct), (void (*)(void *)) sapi_free_header, 0);
	SG(sapi_headers).send_default_content_type = 1;

	/*
	SG(sapi_headers).http_response_code = 200;
	*/
	SG(sapi_headers).http_status_line = NULL;
	SG(sapi_headers).mimetype = NULL;
	SG(headers_sent) = 0;
	ZVAL_UNDEF(&SG(callback_func));
	SG(read_post_bytes) = 0;
	SG(request_info).request_body = NULL;
	SG(request_info).current_user = NULL;
	SG(request_info).current_user_length = 0;
	SG(request_info).no_headers = 0;
	SG(request_info).post_entry = NULL;
	SG(request_info).proto_num = 1000; /* Default to HTTP 1.0 */
	SG(global_request_time) = 0;
	SG(post_read) = 0;
	/* It's possible to override this general case in the activate() callback, if necessary. */
	if (SG(request_info).request_method && !strcmp(SG(request_info).request_method, "HEAD")) {
		SG(request_info).headers_only = 1;
	} else {
		SG(request_info).headers_only = 0;
	}
	SG(rfc1867_uploaded_files) = NULL;
	SG(request_parse_body_context).throw_exceptions = false;
	memset(&SG(request_parse_body_context).options_cache, 0, sizeof(SG(request_parse_body_context).options_cache));

	if (sapi_module.pre_request_init) {
		sapi_module.pre_request_init();
	}

	/* Handle request method */
	if (SG(server_context)) {
		if (PG(enable_post_data_reading)
		&& 	SG(request_info).content_type
		&&  SG(request_info).request_method
		&& !strcmp(SG(request_info).request_method, "POST")) {
			/* HTTP POST may contain form data to be processed into variables
			 * depending on given content type */
			sapi_read_post_data();
		} else {
			SG(request_info).content_type_dup = NULL;
		}

		/* Cookies */
		SG(request_info).cookie_data = sapi_module.read_cookies();
	}
	if (sapi_module.activate) {
		sapi_module.activate();
	}
	if (sapi_module.input_filter_init) {
		sapi_module.input_filter_init();
	}
}


static void sapi_send_headers_free(void)
{
	if (SG(sapi_headers).http_status_line) {
		efree(SG(sapi_headers).http_status_line);
		SG(sapi_headers).http_status_line = NULL;
	}
}

SAPI_API void sapi_deactivate_module(void)
{
	zend_llist_destroy(&SG(sapi_headers).headers);
	if (SG(request_info).request_body) {
		SG(request_info).request_body = NULL;
	} else if (SG(server_context)) {
		if (!SG(post_read)) {
			/* make sure we've consumed all request input data */
			char dummy[SAPI_POST_BLOCK_SIZE];
			size_t read_bytes;

			do {
				read_bytes = sapi_read_post_block(dummy, SAPI_POST_BLOCK_SIZE);
			} while (SAPI_POST_BLOCK_SIZE == read_bytes);
		}
	}
	if (SG(request_info).auth_user) {
		efree(SG(request_info).auth_user);
		SG(request_info).auth_user = NULL;
	}
	if (SG(request_info).auth_password) {
		efree(SG(request_info).auth_password);
		SG(request_info).auth_password = NULL;
	}
	if (SG(request_info).auth_digest) {
		efree(SG(request_info).auth_digest);
		SG(request_info).auth_digest = NULL;
	}
	if (SG(request_info).content_type_dup) {
		efree(SG(request_info).content_type_dup);
	}
	if (SG(request_info).current_user) {
		efree(SG(request_info).current_user);
	}
	if (sapi_module.deactivate) {
		sapi_module.deactivate();
	}
}

SAPI_API void sapi_deactivate_destroy(void)
{
	if (SG(rfc1867_uploaded_files)) {
		destroy_uploaded_files_hash();
	}
	if (SG(sapi_headers).mimetype) {
		efree(SG(sapi_headers).mimetype);
		SG(sapi_headers).mimetype = NULL;
	}
	sapi_send_headers_free();
	SG(sapi_started) = 0;
	SG(headers_sent) = 0;
	SG(request_info).headers_read = 0;
	SG(global_request_time) = 0;
}

SAPI_API void sapi_deactivate(void)
{
	sapi_deactivate_module();
	sapi_deactivate_destroy();
}


SAPI_API void sapi_initialize_empty_request(void)
{
	SG(server_context) = NULL;
	SG(request_info).request_method = NULL;
	SG(request_info).auth_digest = SG(request_info).auth_user = SG(request_info).auth_password = NULL;
	SG(request_info).content_type_dup = NULL;
}


static int sapi_extract_response_code(const char *header_line)
{
	int code = 200;
	const char *ptr;

	for (ptr = header_line; *ptr; ptr++) {
		if (*ptr == ' ' && *(ptr + 1) != ' ') {
			code = atoi(ptr + 1);
			break;
		}
	}

	return code;
}


static void sapi_update_response_code(int ncode)
{
	/* if the status code did not change, we do not want
	   to change the status line, and no need to change the code */
	if (SG(sapi_headers).http_response_code == ncode) {
		return;
	}

	if (SG(sapi_headers).http_status_line) {
		efree(SG(sapi_headers).http_status_line);
		SG(sapi_headers).http_status_line = NULL;
	}
	SG(sapi_headers).http_response_code = ncode;
}

/*
 * since zend_llist_del_element only removes one matched item once,
 * we should remove them manually
 */
static void sapi_remove_header(zend_llist *l, char *name, size_t len, size_t prefix_len)
{
	sapi_header_struct *header;
	zend_llist_element *next;
	zend_llist_element *current=l->head;

	while (current) {
		header = (sapi_header_struct *)(current->data);
		next = current->next;
		/*
		 * prefix_len is set for DELETE_PREFIX (used for deleting i.e.
		 * "Set-Cookie: PHPSESSID=", where we need more than just key)
		 * look for the : otherwise
		 */
		if (header->header_len > len
				&& (header->header[len] == ':' || (prefix_len && len > prefix_len))
				&& !strncasecmp(header->header, name, len)) {
			if (current->prev) {
				current->prev->next = next;
			} else {
				l->head = next;
			}
			if (next) {
				next->prev = current->prev;
			} else {
				l->tail = current->prev;
			}
			sapi_free_header(header);
			efree(current);
			--l->count;
		}
		current = next;
	}
}

SAPI_API int sapi_add_header_ex(const char *header_line, size_t header_line_len, bool duplicate, bool replace)
{
	sapi_header_line ctr = {0};
	int r;

	ctr.line = header_line;
	ctr.line_len = header_line_len;

	r = sapi_header_op(replace ? SAPI_HEADER_REPLACE : SAPI_HEADER_ADD,
			&ctr);

	if (!duplicate)
		efree((void *) header_line);

	return r;
}

static void sapi_header_add_op(sapi_header_op_enum op, sapi_header_struct *sapi_header)
{
	if (!sapi_module.header_handler ||
		(SAPI_HEADER_ADD & sapi_module.header_handler(sapi_header, op, &SG(sapi_headers)))) {
		if (op == SAPI_HEADER_REPLACE) {
			char *colon_offset = strchr(sapi_header->header, ':');

			if (colon_offset) {
				char sav = *colon_offset;

				*colon_offset = 0;
				sapi_remove_header(&SG(sapi_headers).headers, sapi_header->header, strlen(sapi_header->header), 0);
				*colon_offset = sav;
			}
		}
		zend_llist_add_element(&SG(sapi_headers).headers, (void *) sapi_header);
	} else {
		sapi_free_header(sapi_header);
	}
}

SAPI_API int sapi_header_op(sapi_header_op_enum op, void *arg)
{
	sapi_header_struct sapi_header;
	char *colon_offset;
	char *header_line;
	size_t header_line_len, header_len;
	int http_response_code;

	if (SG(headers_sent) && !SG(request_info).no_headers) {
		const char *output_start_filename = php_output_get_start_filename();
		int output_start_lineno = php_output_get_start_lineno();

		if (output_start_filename) {
			sapi_module.sapi_error(E_WARNING, "Cannot modify header information - headers already sent by (output started at %s:%d)",
				output_start_filename, output_start_lineno);
		} else {
			sapi_module.sapi_error(E_WARNING, "Cannot modify header information - headers already sent");
		}
		return FAILURE;
	}

	switch (op) {
		case SAPI_HEADER_SET_STATUS:
			sapi_update_response_code((int)(intptr_t) arg);
			return SUCCESS;

		case SAPI_HEADER_ADD:
		case SAPI_HEADER_REPLACE:
		case SAPI_HEADER_DELETE_PREFIX:
		case SAPI_HEADER_DELETE: {
				sapi_header_line *p = arg;

				if (!p->line || !p->line_len) {
					return FAILURE;
				}
				header_line = estrndup(p->line, p->line_len);
				header_line_len = p->line_len;
				if (op == SAPI_HEADER_DELETE_PREFIX) {
					header_len = p->header_len;
					http_response_code = 0;
				} else {
					header_len = 0;
					http_response_code = p->response_code;
				}
				break;
			}

		case SAPI_HEADER_DELETE_ALL:
			if (sapi_module.header_handler) {
				sapi_module.header_handler(&sapi_header, op, &SG(sapi_headers));
			}
			zend_llist_clean(&SG(sapi_headers).headers);
			return SUCCESS;

		default:
			return FAILURE;
	}

	/* cut off trailing spaces, linefeeds and carriage-returns */
	if (header_line_len && isspace((unsigned char)header_line[header_line_len - 1])) {
		do {
			header_line_len--;
		} while(header_line_len && isspace((unsigned char)header_line[header_line_len - 1]));
		header_line[header_line_len]='\0';
	}

	if (op == SAPI_HEADER_DELETE || op == SAPI_HEADER_DELETE_PREFIX) {
		if (op == SAPI_HEADER_DELETE && strchr(header_line, ':')) {
			efree(header_line);
			sapi_module.sapi_error(E_WARNING, "Header to delete may not contain colon.");
			return FAILURE;
		}
		if (sapi_module.header_handler) {
			sapi_header.header = header_line;
			sapi_header.header_len = header_line_len;
			sapi_module.header_handler(&sapi_header, op, &SG(sapi_headers));
		}
		sapi_remove_header(&SG(sapi_headers).headers, header_line, header_line_len, header_len);
		efree(header_line);
		return SUCCESS;
	} else {
		/* new line/NUL character safety check */
		uint32_t i;
		for (i = 0; i < header_line_len; i++) {
			/* RFC 7230 ch. 3.2.4 deprecates folding support */
			if (header_line[i] == '\n' || header_line[i] == '\r') {
				efree(header_line);
				sapi_module.sapi_error(E_WARNING, "Header may not contain "
						"more than a single header, new line detected");
				return FAILURE;
			}
			if (header_line[i] == '\0') {
				efree(header_line);
				sapi_module.sapi_error(E_WARNING, "Header may not contain NUL bytes");
				return FAILURE;
			}
		}
	}

	sapi_header.header = header_line;
	sapi_header.header_len = header_line_len;

	/* Check the header for a few cases that we have special support for in SAPI */
	if (header_line_len>=5
		&& !strncasecmp(header_line, "HTTP/", 5)) {
		/* filter out the response code */
		sapi_update_response_code(sapi_extract_response_code(header_line));
		/* sapi_update_response_code doesn't free the status line if the code didn't change */
		if (SG(sapi_headers).http_status_line) {
			efree(SG(sapi_headers).http_status_line);
		}
		SG(sapi_headers).http_status_line = header_line;
		return SUCCESS;
	} else {
		colon_offset = strchr(header_line, ':');
		if (colon_offset) {
			*colon_offset = 0;
			if (!strcasecmp(header_line, "Content-Type")) {
				char *ptr = colon_offset+1, *mimetype = NULL, *newheader;
				size_t len = header_line_len - (ptr - header_line), newlen;
				while (*ptr == ' ') {
					ptr++;
					len--;
				}

				mimetype = estrdup(ptr);
				newlen = sapi_apply_default_charset(&mimetype, len);
				if (!SG(sapi_headers).mimetype){
					SG(sapi_headers).mimetype = estrdup(mimetype);
				}

				if (newlen != 0) {
					newlen += sizeof("Content-type: ");
					newheader = emalloc(newlen);
					PHP_STRLCPY(newheader, "Content-type: ", newlen, sizeof("Content-type: ")-1);
					strlcat(newheader, mimetype, newlen);
					sapi_header.header = newheader;
					sapi_header.header_len = (uint32_t)(newlen - 1);
					efree(header_line);
				}
				efree(mimetype);
				SG(sapi_headers).send_default_content_type = 0;
			} else if (!strcasecmp(header_line, "Content-Length")) {
				/* Script is setting Content-length. The script cannot reasonably
				 * know the size of the message body after compression, so it's best
				 * to disable compression altogether. This contributes to making scripts
				 * portable between setups that have and don't have zlib compression
				 * enabled globally. See req #44164 */
				zend_string *key = ZSTR_INIT_LITERAL("zlib.output_compression", 0);
				zend_alter_ini_entry_chars(key,
					"0", sizeof("0") - 1, PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
				zend_string_release_ex(key, 0);
			} else if (!strcasecmp(header_line, "Location")) {
				if ((SG(sapi_headers).http_response_code < 300 ||
					SG(sapi_headers).http_response_code > 399) &&
					SG(sapi_headers).http_response_code != 201) {
					/* Return a Found Redirect if one is not already specified */
					if (http_response_code) { /* user specified redirect code */
						sapi_update_response_code(http_response_code);
					} else if (SG(request_info).proto_num > 1000 &&
					   SG(request_info).request_method &&
					   strcmp(SG(request_info).request_method, "HEAD") &&
					   strcmp(SG(request_info).request_method, "GET")) {
						sapi_update_response_code(303);
					} else {
						sapi_update_response_code(302);
					}
				}
			} else if (!strcasecmp(header_line, "WWW-Authenticate")) { /* HTTP Authentication */
				sapi_update_response_code(401); /* authentication-required */
			}
			if (sapi_header.header==header_line) {
				*colon_offset = ':';
			}
		}
	}
	if (http_response_code) {
		sapi_update_response_code(http_response_code);
	}
	sapi_header_add_op(op, &sapi_header);
	return SUCCESS;
}


SAPI_API int sapi_send_headers(void)
{
	int retval;
	int ret = FAILURE;

	if (SG(headers_sent) || SG(request_info).no_headers) {
		return SUCCESS;
	}

	/* Success-oriented. We set headers_sent to 1 here to avoid an infinite loop
	 * in case of an error situation.
	 */
	if (SG(sapi_headers).send_default_content_type && sapi_module.send_headers) {
	    uint32_t len = 0;
		char *default_mimetype = get_default_content_type(0, &len);

		if (default_mimetype && len) {
			sapi_header_struct default_header;

			SG(sapi_headers).mimetype = default_mimetype;

			default_header.header_len = sizeof("Content-type: ") - 1 + len;
			default_header.header = emalloc(default_header.header_len + 1);

			memcpy(default_header.header, "Content-type: ", sizeof("Content-type: ") - 1);
			memcpy(default_header.header + sizeof("Content-type: ") - 1, SG(sapi_headers).mimetype, len + 1);

			sapi_header_add_op(SAPI_HEADER_ADD, &default_header);
		} else {
			efree(default_mimetype);
		}
		SG(sapi_headers).send_default_content_type = 0;
	}

	if (Z_TYPE(SG(callback_func)) != IS_UNDEF) {
		zval cb;
		ZVAL_COPY_VALUE(&cb, &SG(callback_func));
		ZVAL_UNDEF(&SG(callback_func));
		sapi_run_header_callback(&cb);
		zval_ptr_dtor(&cb);
	}

	SG(headers_sent) = 1;

	if (sapi_module.send_headers) {
		retval = sapi_module.send_headers(&SG(sapi_headers));
	} else {
		retval = SAPI_HEADER_DO_SEND;
	}

	switch (retval) {
		case SAPI_HEADER_SENT_SUCCESSFULLY:
			ret = SUCCESS;
			break;
		case SAPI_HEADER_DO_SEND: {
				sapi_header_struct http_status_line;
				char buf[255];

				if (SG(sapi_headers).http_status_line) {
					http_status_line.header = SG(sapi_headers).http_status_line;
					http_status_line.header_len = (uint32_t)strlen(SG(sapi_headers).http_status_line);
				} else {
					http_status_line.header = buf;
					http_status_line.header_len = slprintf(buf, sizeof(buf), "HTTP/1.0 %d X", SG(sapi_headers).http_response_code);
				}
				sapi_module.send_header(&http_status_line, SG(server_context));
			}
			zend_llist_apply_with_argument(&SG(sapi_headers).headers, (llist_apply_with_arg_func_t) sapi_module.send_header, SG(server_context));
			if(SG(sapi_headers).send_default_content_type) {
				sapi_header_struct default_header;

				sapi_get_default_content_type_header(&default_header);
				sapi_module.send_header(&default_header, SG(server_context));
				sapi_free_header(&default_header);
			}
			sapi_module.send_header(NULL, SG(server_context));
			ret = SUCCESS;
			break;
		case SAPI_HEADER_SEND_FAILED:
			SG(headers_sent) = 0;
			ret = FAILURE;
			break;
	}

	sapi_send_headers_free();

	return ret;
}


SAPI_API int sapi_register_post_entries(const sapi_post_entry *post_entries)
{
	const sapi_post_entry *p=post_entries;

	while (p->content_type) {
		if (sapi_register_post_entry(p) == FAILURE) {
			return FAILURE;
		}
		p++;
	}
	return SUCCESS;
}


SAPI_API int sapi_register_post_entry(const sapi_post_entry *post_entry)
{
	int ret;
	zend_string *key;
	if (SG(sapi_started) && EG(current_execute_data)) {
		return FAILURE;
	}
	key = zend_string_init(post_entry->content_type, post_entry->content_type_len, 1);
	GC_MAKE_PERSISTENT_LOCAL(key);
	ret = zend_hash_add_mem(&SG(known_post_content_types), key,
			(void *) post_entry, sizeof(sapi_post_entry)) ? SUCCESS : FAILURE;
	zend_string_release_ex(key, 1);
	return ret;
}

SAPI_API void sapi_unregister_post_entry(const sapi_post_entry *post_entry)
{
	if (SG(sapi_started) && EG(current_execute_data)) {
		return;
	}
	zend_hash_str_del(&SG(known_post_content_types), post_entry->content_type,
			post_entry->content_type_len);
}


SAPI_API int sapi_register_default_post_reader(void (*default_post_reader)(void))
{
	if (SG(sapi_started) && EG(current_execute_data)) {
		return FAILURE;
	}
	sapi_module.default_post_reader = default_post_reader;
	return SUCCESS;
}


SAPI_API int sapi_register_treat_data(void (*treat_data)(int arg, char *str, zval *destArray))
{
	if (SG(sapi_started) && EG(current_execute_data)) {
		return FAILURE;
	}
	sapi_module.treat_data = treat_data;
	return SUCCESS;
}

SAPI_API int sapi_register_input_filter(unsigned int (*input_filter)(int arg, const char *var, char **val, size_t val_len, size_t *new_val_len), unsigned int (*input_filter_init)(void))
{
	if (SG(sapi_started) && EG(current_execute_data)) {
		return FAILURE;
	}
	sapi_module.input_filter = input_filter;
	sapi_module.input_filter_init = input_filter_init;
	return SUCCESS;
}

SAPI_API int sapi_flush(void)
{
	if (sapi_module.flush) {
		sapi_module.flush(SG(server_context));
		return SUCCESS;
	} else {
		return FAILURE;
	}
}

SAPI_API zend_stat_t *sapi_get_stat(void)
{
	if (sapi_module.get_stat) {
		return sapi_module.get_stat();
	} else {
		if (!SG(request_info).path_translated || (VCWD_STAT(SG(request_info).path_translated, &SG(global_stat)) == -1)) {
			return NULL;
		}
		return &SG(global_stat);
	}
}

SAPI_API char *sapi_getenv(const char *name, size_t name_len)
{
	char *value, *tmp;

	if (!sapi_module.getenv) {
		return NULL;
	}
	if (!strncasecmp(name, "HTTP_PROXY", name_len)) {
		/* Ugly fix for HTTP_PROXY issue, see bug #72573 */
		return NULL;
	}
	tmp = sapi_module.getenv(name, name_len);
	if (!tmp) {
		return NULL;
	}
	value = estrdup(tmp);
#ifdef PHP_WIN32
	if (strlen(sapi_module.name) == sizeof("cgi-fcgi") - 1 && !strcmp(sapi_module.name, "cgi-fcgi")) {
		/* XXX more modules to go, if needed. */
		free(tmp);
	}
#endif
	if (sapi_module.input_filter) {
		sapi_module.input_filter(PARSE_STRING, name, &value, strlen(value), NULL);
	}
	return value;
}

SAPI_API int sapi_get_fd(int *fd)
{
	if (sapi_module.get_fd) {
		return sapi_module.get_fd(fd);
	} else {
		return FAILURE;
	}
}

SAPI_API int sapi_force_http_10(void)
{
	if (sapi_module.force_http_10) {
		return sapi_module.force_http_10();
	} else {
		return FAILURE;
	}
}


SAPI_API int sapi_get_target_uid(uid_t *obj)
{
	if (sapi_module.get_target_uid) {
		return sapi_module.get_target_uid(obj);
	} else {
		return FAILURE;
	}
}

SAPI_API int sapi_get_target_gid(gid_t *obj)
{
	if (sapi_module.get_target_gid) {
		return sapi_module.get_target_gid(obj);
	} else {
		return FAILURE;
	}
}

SAPI_API double sapi_get_request_time(void)
{
	if(SG(global_request_time)) return SG(global_request_time);

	if (!sapi_module.get_request_time
			|| sapi_module.get_request_time(&SG(global_request_time)) == FAILURE) {
		struct timeval tp = {0};
		if (!gettimeofday(&tp, NULL)) {
			SG(global_request_time) = (double)(tp.tv_sec + tp.tv_usec / 1000000.00);
		} else {
			SG(global_request_time) = (double)time(0);
		}
	}
	return SG(global_request_time);
}

SAPI_API void sapi_terminate_process(void) {
	if (sapi_module.terminate_process) {
		sapi_module.terminate_process();
	}
}

SAPI_API void sapi_add_request_header(const char *var, unsigned int var_len, char *val, unsigned int val_len, void *arg) /* {{{ */
{
	zval *return_value = (zval*)arg;
	char *buf = NULL;

	ALLOCA_FLAG(use_heap)

	if (var_len > 5 &&
	    var[0] == 'H' &&
	    var[1] == 'T' &&
	    var[2] == 'T' &&
	    var[3] == 'P' &&
	    var[4] == '_') {

		const char *p;
		char *str;

		var_len -= 5;
		p = var + 5;
		var = str = buf = do_alloca(var_len + 1, use_heap);
		*str++ = *p++;
		while (*p) {
			if (*p == '_') {
				*str++ = '-';
				p++;
				if (*p) {
					*str++ = *p++;
				}
			} else if (*p >= 'A' && *p <= 'Z') {
				*str++ = (*p++ - 'A' + 'a');
			} else {
				*str++ = *p++;
			}
		}
		*str = 0;
	} else if (var_len == sizeof("CONTENT_TYPE")-1 &&
	           memcmp(var, "CONTENT_TYPE", sizeof("CONTENT_TYPE")-1) == 0) {
		var = "Content-Type";
	} else if (var_len == sizeof("CONTENT_LENGTH")-1 &&
	           memcmp(var, "CONTENT_LENGTH", sizeof("CONTENT_LENGTH")-1) == 0) {
		var = "Content-Length";
	} else {
		return;
	}
	add_assoc_stringl_ex(return_value, var, var_len, val, val_len);
	if (buf) {
		free_alloca(buf, use_heap);
	}
}
/* }}} */
