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Diffstat (limited to 'contrib/impcap/ipx_parser.c')
| -rw-r--r-- | contrib/impcap/ipx_parser.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/contrib/impcap/ipx_parser.c b/contrib/impcap/ipx_parser.c new file mode 100644 index 0000000..acd43bc --- /dev/null +++ b/contrib/impcap/ipx_parser.c @@ -0,0 +1,97 @@ +/* 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) +} |