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AddToStore: parse references and repair flag

This commit is contained in:
Félix Baylac Jacqué 2023-09-14 17:13:23 +02:00
parent d18bc9a385
commit 3ea1474af5
1 changed files with 25 additions and 5 deletions
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30
nix-packet.lua
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@ -16,6 +16,9 @@ local op_name_field = ProtoField.string("nix.opname", "Operation Name")
local op_addtostore = ProtoField.bytes("nix.addtostore", "Add to store operation")
local op_addtostore_name = ProtoField.string("nix.addtostore.name", "Add to store name")
local op_addtostore_camstr = ProtoField.string("nix.camstr.name", "Add to store camstr")
local op_addtostore_nb_references = ProtoField.uint64("nix.camstr.nbreferences", "Number of References")
local op_addtostore_reference = ProtoField.string("nix.camstr.reference", "Reference")
local op_addtostore_repairflag = ProtoField.bool("nix.camstr.repairflag", "Repair Flag")
nix_proto.fields = {
dst_field,
@ -31,7 +34,10 @@ nix_proto.fields = {
op_name_field,
op_addtostore,
op_addtostore_name,
op_addtostore_camstr
op_addtostore_camstr,
op_addtostore_nb_references,
op_addtostore_reference,
op_addtostore_repairflag,
}
local op_table = {
@ -109,12 +115,13 @@ function read_string(tvb, pinfo, tree, offset)
local size = tvb(offset,4):le_int()
local offset = offset + 8
-- Strings are 8-aligned. We need to discard the potential padding.
if (size % 8) ~= 0 then
-- Parting the string. They are null-padded, so we'll get a the
-- null terminaison wireshark is expecting for free.
str = tvb(offset,size):string()
offset = offset + (size + ((8 - (size % 8))))
offset = offset + (size + (8 - (size % 8)))
else
-- The string is already 8-aligned. This is a bit annoying:
-- Wireshark expects the strings to be null terminated. Nix
@ -139,15 +146,28 @@ end
function parse_add_to_store(tvb, pinfo, tree, offset)
local initoffset = offset
local offsetname = 0
offsetname, name = read_string(tvb, pinfo, tree, offset)
offset, camstr = read_string(tvb, pinfo, tree, offsetname)
offsetname, name = read_string(tvb, pinfo, tree, offset)
offset, camstr = read_string(tvb, pinfo, tree, offsetname)
local subtree = tree:add(op_addtostore, tvb(initoffset, offset - initoffset))
subtree:add(op_addtostore_name, tvb(initoffset, offsetname - initoffset), name)
subtree:add(op_addtostore_camstr, tvb(offsetname, offset - offsetname), camstr)
local nb_references = tvb(offset,4):le_int()
subtree:add_le(op_addtostore_nb_references, tvb(offset,8))
offset = offset + 8
local reference
local prevoffset
for i=1, nb_references do
prevoffset = offset
offset, reference = read_string(tvb, pinfo, tree, offset)
subtree:add(op_addtostore_reference, tvb(prevoffset, offset - prevoffset), reference)
end
local repairflag = subtree:add(op_addtostore_repairflag, tvb(offset, 1))
offset = offset + 8
return offset
end