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mongo: add Checksum field

This commit is contained in:
Kevin Albertson 2022-11-20 19:49:37 -05:00 committed by A Wireshark GitLab Utility
parent 15b3deff27
commit 3f8ae9a08d
1 changed files with 27 additions and 2 deletions
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29
epan/dissectors/packet-mongo.c
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@ -23,6 +23,8 @@
#include <epan/exceptions.h>
#include <epan/expert.h>
#include <epan/proto_data.h>
#include <wsutil/crc32.h> // CRC32C_PRELOAD
#include <epan/crc32-tvb.h> // crc32c_tvb_offset_calculate
#include "packet-tcp.h"
#include "packet-tls.h"
#ifdef HAVE_SNAPPY
@ -260,6 +262,7 @@ static int hf_mongo_msg_sections_section_body = -1;
static int hf_mongo_msg_sections_section_doc_sequence = -1;
static int hf_mongo_msg_sections_section_size = -1;
static int hf_mongo_msg_sections_section_doc_sequence_id = -1;
static int hf_mongo_msg_checksum = -1;
static gint ett_mongo = -1;
static gint ett_mongo_doc = -1;
@ -840,14 +843,31 @@ dissect_mongo_op_msg(tvbuff_t *tvb, packet_info *pinfo, guint offset, proto_tree
&hf_mongo_msg_flags_exhaustallowed,
NULL
};
gint64 op_msg_flags;
bool checksum_present = false;
proto_tree_add_bitmask_ret_uint64 (tree, tvb, offset, hf_mongo_msg_flags, ett_mongo_msg_flags, mongo_msg_flags, ENC_LITTLE_ENDIAN, &op_msg_flags);
if (op_msg_flags & 0x00000001) {
checksum_present = true;
}
proto_tree_add_bitmask(tree, tvb, offset, hf_mongo_msg_flags, ett_mongo_msg_flags, mongo_msg_flags, ENC_LITTLE_ENDIAN);
offset += 4;
while (tvb_reported_length_remaining(tvb, offset) > 0){
while (tvb_reported_length_remaining(tvb, offset) > (checksum_present ? 4 : 0)){
offset += dissect_op_msg_section(tvb, pinfo, offset, tree);
}
if (checksum_present) {
guint32 calculated_checksum = ~crc32c_tvb_offset_calculate (tvb, 0, tvb_reported_length (tvb) - 4, CRC32C_PRELOAD);
guint32 dissected_checksum = tvb_get_ntohl(tvb, offset);
if(calculated_checksum == dissected_checksum) {
proto_tree_add_uint_format_value(tree, hf_mongo_msg_checksum, tvb, offset, 4, dissected_checksum, "0x%08x (Good CRC32)", dissected_checksum);
} else {
proto_tree_add_uint_format_value(tree, hf_mongo_msg_checksum, tvb, offset, 4, dissected_checksum, "0x%08x (Bad CRC32, should be 0x%08x)", dissected_checksum, calculated_checksum);
}
offset += 4;
}
return offset;
}
@ -1272,6 +1292,11 @@ proto_register_mongo(void)
FT_STRING, BASE_NONE, NULL, 0x0,
"Document sequence identifier", HFILL }
},
{ &hf_mongo_msg_checksum,
{ "Checksum", "mongo.msg.checksum",
FT_UINT32, BASE_HEX, NULL, 0x0,
"CRC32C checksum.", HFILL }
},
{ &hf_mongo_number_of_cursor_ids,
{ "Number of Cursor IDS", "mongo.number_to_cursor_ids",
FT_INT32, BASE_DEC, NULL, 0x0,