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/**
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* @file enc_syslog.c
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* Encoder for syslog format.
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* This file contains code from all related objects that is required in
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* order to encode syslog format. The core idea of putting all of this into
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* a single file is that this makes it very straightforward to write
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* encoders for different encodings, as all is in one place.
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*/
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/*
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* liblognorm - a fast samples-based log normalization library
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* Copyright 2010-2016 by Rainer Gerhards and Adiscon GmbH.
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*
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* Modified by Pavel Levshin (pavel@levshin.spb.ru) in 2013
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*
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* This file is part of liblognorm.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* A copy of the LGPL v2.1 can be found in the file "COPYING" in this distribution.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <string.h>
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#include <libestr.h>
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#include "internal.h"
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#include "liblognorm.h"
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#include "enc.h"
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static int
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ln_addValue_Syslog(const char *value, es_str_t **str)
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{
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int r;
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es_size_t i;
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assert(str != NULL);
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assert(*str != NULL);
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assert(value != NULL);
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for(i = 0; i < strlen(value); i++) {
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switch(value[i]) {
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case '\0':
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es_addChar(str, '\\');
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es_addChar(str, '0');
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break;
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case '\n':
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es_addChar(str, '\\');
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es_addChar(str, 'n');
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break;
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/* TODO : add rest of control characters here... */
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case ',': /* comma is CEE-reserved for lists */
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es_addChar(str, '\\');
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es_addChar(str, ',');
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break;
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#if 0 /* alternative encoding for discussion */
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case '^': /* CEE-reserved for lists */
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es_addChar(str, '\\');
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es_addChar(str, '^');
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break;
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#endif
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/* at this layer ... do we need to think about transport
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* encoding at all? Or simply leave it to the transport agent?
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*/
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case '\\': /* RFC5424 reserved */
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es_addChar(str, '\\');
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es_addChar(str, '\\');
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break;
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case ']': /* RFC5424 reserved */
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es_addChar(str, '\\');
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es_addChar(str, ']');
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break;
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case '\"': /* RFC5424 reserved */
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es_addChar(str, '\\');
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es_addChar(str, '\"');
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break;
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default:
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es_addChar(str, value[i]);
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break;
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}
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}
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r = 0;
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return r;
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}
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static int
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ln_addField_Syslog(char *name, struct json_object *field, es_str_t **str)
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{
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int r;
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const char *value;
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int needComma = 0;
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struct json_object *obj;
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int i;
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assert(field != NULL);
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assert(str != NULL);
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assert(*str != NULL);
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CHKR(es_addBuf(str, name, strlen(name)));
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CHKR(es_addBuf(str, "=\"", 2));
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switch(json_object_get_type(field)) {
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case json_type_array:
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for (i = json_object_array_length(field) - 1; i >= 0; i--) {
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if(needComma)
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es_addChar(str, ',');
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else
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needComma = 1;
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CHKN(obj = json_object_array_get_idx(field, i));
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CHKN(value = json_object_get_string(obj));
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CHKR(ln_addValue_Syslog(value, str));
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}
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break;
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case json_type_string:
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case json_type_int:
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CHKN(value = json_object_get_string(field));
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CHKR(ln_addValue_Syslog(value, str));
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break;
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case json_type_null:
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case json_type_boolean:
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case json_type_double:
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case json_type_object:
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CHKR(es_addBuf(str, "***unsupported type***", sizeof("***unsupported type***")-1));
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break;
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default:
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CHKR(es_addBuf(str, "***OBJECT***", sizeof("***OBJECT***")-1));
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}
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CHKR(es_addChar(str, '\"'));
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r = 0;
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done:
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return r;
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}
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static inline int
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ln_addTags_Syslog(struct json_object *taglist, es_str_t **str)
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{
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int r = 0;
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struct json_object *tagObj;
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int needComma = 0;
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const char *tagCstr;
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int i;
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assert(json_object_is_type(taglist, json_type_array));
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CHKR(es_addBuf(str, " event.tags=\"", 13));
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for (i = json_object_array_length(taglist) - 1; i >= 0; i--) {
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if(needComma)
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es_addChar(str, ',');
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else
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needComma = 1;
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CHKN(tagObj = json_object_array_get_idx(taglist, i));
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CHKN(tagCstr = json_object_get_string(tagObj));
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CHKR(es_addBuf(str, (char*)tagCstr, strlen(tagCstr)));
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}
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es_addChar(str, '"');
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done: return r;
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}
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int
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ln_fmtEventToRFC5424(struct json_object *json, es_str_t **str)
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{
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int r = -1;
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struct json_object *tags;
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assert(json != NULL);
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assert(json_object_is_type(json, json_type_object));
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if((*str = es_newStr(256)) == NULL)
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goto done;
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es_addBuf(str, "[cee@115", 8);
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if(json_object_object_get_ex(json, "event.tags", &tags)) {
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CHKR(ln_addTags_Syslog(tags, str));
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}
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struct json_object_iterator it = json_object_iter_begin(json);
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struct json_object_iterator itEnd = json_object_iter_end(json);
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while (!json_object_iter_equal(&it, &itEnd)) {
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char *const name = (char*)json_object_iter_peek_name(&it);
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if (strcmp(name, "event.tags")) {
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es_addChar(str, ' ');
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ln_addField_Syslog(name, json_object_iter_peek_value(&it), str);
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}
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json_object_iter_next(&it);
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}
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es_addChar(str, ']');
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done:
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return r;
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}
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