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/* ipx_parser.c
*
* This file contains functions to parse IPX (Novell) headers.
*
* File begun on 2018-11-13
*
* Created by:
* - Théo Bertin (theo.bertin@advens.fr)
*
* With:
* - François Bernard (francois.bernard@isen.yncrea.fr)
* - Tianyu Geng (tianyu.geng@isen.yncrea.fr)
*
* This file is part of rsyslog.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* -or-
* see COPYING.ASL20 in the source distribution
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include "parsers.h"
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpacked"
#pragma GCC diagnostic ignored "-Wattributes"
struct __attribute__ ((__packed__)) ipx_header_s {
uint16_t chksum;
uint16_t pktLen;
uint8_t transCtrl;
uint8_t type;
uint32_t dstNet;
uint8_t dstNode[6];
uint16_t dstSocket;
uint32_t srcNet;
uint8_t srcNode[6];
uint16_t srcSocket;
};
#pragma GCC diagnostic pop
typedef struct ipx_header_s ipx_header_t;
/*
* This function parses the bytes in the received packet to extract IPX metadata.
*
* its parameters are:
* - a pointer on the list of bytes representing the packet
* the first byte must be the beginning of the IPX header
* - the size of the list passed as first parameter
* - a pointer on a json_object, containing all the metadata recovered so far
* this is also where IPX metadata will be added
*
* This function returns a structure containing the data unprocessed by this parser
* or the ones after (as a list of bytes), and the length of this data.
*/
data_ret_t *ipx_parse(const uchar *packet, int pktSize, struct json_object *jparent) {
DBGPRINTF("entered ipx_parse\n");
DBGPRINTF("packet size %d\n", pktSize);
if (pktSize < 30) { /* too short for IPX header */
DBGPRINTF("IPX packet too small : %d\n", pktSize);
RETURN_DATA_AFTER(0)
}
char ipxSrcNode[20], ipxDstNode[20];
ipx_header_t *ipx_header = (ipx_header_t *)packet;
snprintf(ipxDstNode, sizeof(ipxDstNode), "%02x:%02x:%02x:%02x:%02x:%02x", ipx_header->dstNode[0],
ipx_header->dstNode[1], ipx_header->dstNode[2], ipx_header->dstNode[3], ipx_header->dstNode[4],
ipx_header->dstNode[5]);
snprintf(ipxSrcNode, sizeof(ipxSrcNode), "%02x:%02x:%02x:%02x:%02x:%02x", ipx_header->srcNode[0],
ipx_header->srcNode[1], ipx_header->srcNode[2], ipx_header->srcNode[3], ipx_header->srcNode[4],
ipx_header->srcNode[5]);
json_object_object_add(jparent, "IPX_transCtrl", json_object_new_int(ipx_header->transCtrl));
json_object_object_add(jparent, "IPX_type", json_object_new_int(ipx_header->type));
json_object_object_add(jparent, "IPX_dest_net", json_object_new_int(ntohl(ipx_header->dstNet)));
json_object_object_add(jparent, "IPX_src_net", json_object_new_int(ntohl(ipx_header->srcNet)));
json_object_object_add(jparent, "IPX_dest_node", json_object_new_string(ipxDstNode));
json_object_object_add(jparent, "IPX_src_node", json_object_new_string(ipxSrcNode));
json_object_object_add(jparent, "IPX_dest_socket", json_object_new_int(ntohs(ipx_header->dstSocket)));
json_object_object_add(jparent, "IPX_src_socket", json_object_new_int(ntohs(ipx_header->srcSocket)));
RETURN_DATA_AFTER(30)
}
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