/*
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | https://www.php.net/license/3_01.txt                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Author: Philip Prindeville <philipp@redfish-solutions.com>           |
   +----------------------------------------------------------------------+
*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "php.h"
#include "php_syslog.h"

#include "zend.h"
#include "zend_smart_string.h"

/*
 * The SCO OpenServer 5 Development System (not the UDK)
 * defines syslog to std_syslog.
 */

#ifdef HAVE_STD_SYSLOG
#define syslog std_syslog
#endif

PHPAPI void php_syslog_str(int priority, const zend_string* message)
{
	smart_string sbuf = {0};

	if (PG(syslog_filter) == PHP_SYSLOG_FILTER_RAW) {
		/* Just send it directly to the syslog */
		syslog(priority, "%s", ZSTR_VAL(message));
		return;
	}

	/* We use < because we don't want the final NUL byte to be converted to '\x00' */
	for (size_t i = 0; i < ZSTR_LEN(message); ++i) {
		unsigned char c = ZSTR_VAL(message)[i];

		/* check for NVT ASCII only unless test disabled */
		if (((0x20 <= c) && (c <= 0x7e))) {
			smart_string_appendc(&sbuf, c);
		} else if ((c >= 0x80) && (PG(syslog_filter) != PHP_SYSLOG_FILTER_ASCII)) {
			smart_string_appendc(&sbuf, c);
		} else if (c == '\n') {
			/* Smart string is not NUL terminated */
			syslog(priority, "%.*s", (int)sbuf.len, sbuf.c);
			smart_string_reset(&sbuf);
		} else if ((c < 0x20) && (PG(syslog_filter) == PHP_SYSLOG_FILTER_ALL)) {
			smart_string_appendc(&sbuf, c);
		} else {
			const char xdigits[] = "0123456789abcdef";

			smart_string_appendl(&sbuf, "\\x", 2);
			smart_string_appendc(&sbuf, xdigits[c >> 4]);
			smart_string_appendc(&sbuf, xdigits[c & 0xf]);
		}
	}

	/* Smart string is not NUL terminated */
	syslog(priority, "%.*s", (int)sbuf.len, sbuf.c);
	smart_string_free(&sbuf);
}

void php_openlog(const char *ident, int option, int facility)
{
	openlog(ident, option, facility);
	PG(have_called_openlog) = 1;
}

void php_closelog(void)
{
	closelog();
	PG(have_called_openlog) = 0;
}

#ifdef PHP_WIN32
PHPAPI void php_syslog(int priority, const char *format, ...) /* {{{ */
{
	va_list args;

	/*
	 * don't rely on openlog() being called by syslog() if it's
	 * not already been done; call it ourselves and pass the
	 * correct parameters!
	 */
	if (!PG(have_called_openlog)) {
		php_openlog(PG(syslog_ident), 0, PG(syslog_facility));
	}

	va_start(args, format);
	vsyslog(priority, format, args);
	va_end(args);
}
/* }}} */
#else
PHPAPI void php_syslog(int priority, const char *format, ...) /* {{{ */
{
	zend_string *fbuf = NULL;
	va_list args;

	/*
	 * don't rely on openlog() being called by syslog() if it's
	 * not already been done; call it ourselves and pass the
	 * correct parameters!
	 */
	if (!PG(have_called_openlog)) {
		php_openlog(PG(syslog_ident), 0, PG(syslog_facility));
	}

	va_start(args, format);
	fbuf = zend_vstrpprintf(0, format, args);
	va_end(args);

	php_syslog_str(priority, fbuf);

	zend_string_release(fbuf);
}
/* }}} */
#endif