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wireshark/epan/wslua/wslua_field.c

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/*
* wslua_field.c
*
* Wireshark's interface to the Lua Programming Language
*
* (c) 2006, Luis E. Garcia Ontanon <luis@ontanon.org>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <epan/dfilter/dfilter.h>
#include <epan/ftypes/ftypes-int.h>
/* WSLUA_MODULE Field Obtaining dissection data */
#include "wslua.h"
/* any call to checkFieldInfo() will now error on null or expired, so no need to check again */
WSLUA_CLASS_DEFINE(FieldInfo,FAIL_ON_NULL_OR_EXPIRED("FieldInfo"));
/*
An extracted Field from dissected packet data. A `FieldInfo` object can only be used within
the callback functions of dissectors, post-dissectors, heuristic-dissectors, and taps.
A `FieldInfo` can be called on either existing Wireshark fields by using either `Field.new()`
or `Field()` before-hand, or it can be called on new fields created by Lua from a `ProtoField`.
*/
static GPtrArray* outstanding_FieldInfo = NULL;
FieldInfo* push_FieldInfo(lua_State* L, field_info* f) {
FieldInfo fi = (FieldInfo) g_malloc(sizeof(struct _wslua_field_info));
fi->ws_fi = f;
fi->expired = FALSE;
g_ptr_array_add(outstanding_FieldInfo,fi);
return pushFieldInfo(L,fi);
}
CLEAR_OUTSTANDING(FieldInfo,expired,TRUE)
/* WSLUA_ATTRIBUTE FieldInfo_len RO The length of this field. */
WSLUA_METAMETHOD FieldInfo__len(lua_State* L) {
/*
Obtain the Length of the field
*/
FieldInfo fi = checkFieldInfo(L,1);
lua_pushnumber(L,fi->ws_fi->length);
return 1;
}
/* WSLUA_ATTRIBUTE FieldInfo_offset RO The offset of this field. */
WSLUA_METAMETHOD FieldInfo__unm(lua_State* L) {
/*
Obtain the Offset of the field
*/
FieldInfo fi = checkFieldInfo(L,1);
lua_pushnumber(L,fi->ws_fi->start);
return 1;
}
/* WSLUA_ATTRIBUTE FieldInfo_value RO The value of this field. */
WSLUA_METAMETHOD FieldInfo__call(lua_State* L) {
/*
Obtain the Value of the field.
Previous to 1.11.4, this function retrieved the value for most field types,
but for `ftypes.UINT_BYTES` it retrieved the `ByteArray` of the field's entire `TvbRange`.
In other words, it returned a `ByteArray` that included the leading length byte(s),
instead of just the *value* bytes. That was a bug, and has been changed in 1.11.4.
Furthermore, it retrieved an `ftypes.GUID` as a `ByteArray`, which is also incorrect.
If you wish to still get a `ByteArray` of the `TvbRange`, use `FieldInfo:get_range()`
to get the `TvbRange`, and then use `Tvb:bytes()` to convert it to a `ByteArray`.
*/
FieldInfo fi = checkFieldInfo(L,1);
switch(fi->ws_fi->hfinfo->type) {
case FT_BOOLEAN:
lua_pushboolean(L,(int)fvalue_get_uinteger64(&(fi->ws_fi->value)));
return 1;
case FT_UINT8:
case FT_UINT16:
case FT_UINT24:
case FT_UINT32:
case FT_FRAMENUM:
lua_pushnumber(L,(lua_Number)(fvalue_get_uinteger(&(fi->ws_fi->value))));
return 1;
case FT_INT8:
case FT_INT16:
case FT_INT24:
case FT_INT32:
lua_pushnumber(L,(lua_Number)(fvalue_get_sinteger(&(fi->ws_fi->value))));
return 1;
case FT_FLOAT:
case FT_DOUBLE:
lua_pushnumber(L,(lua_Number)(fvalue_get_floating(&(fi->ws_fi->value))));
return 1;
case FT_INT64: {
pushInt64(L,(Int64)(fvalue_get_sinteger64(&(fi->ws_fi->value))));
return 1;
}
case FT_UINT64: {
pushUInt64(L,fvalue_get_uinteger64(&(fi->ws_fi->value)));
return 1;
}
case FT_ETHER: {
Address eth = (Address)g_malloc(sizeof(address));
alloc_address_tvb(NULL,eth,AT_ETHER,fi->ws_fi->length,fi->ws_fi->ds_tvb,fi->ws_fi->start);
pushAddress(L,eth);
return 1;
}
case FT_IPv4:{
Address ipv4 = (Address)g_malloc(sizeof(address));
alloc_address_tvb(NULL,ipv4,AT_IPv4,fi->ws_fi->length,fi->ws_fi->ds_tvb,fi->ws_fi->start);
pushAddress(L,ipv4);
return 1;
}
case FT_IPv6: {
Address ipv6 = (Address)g_malloc(sizeof(address));
alloc_address_tvb(NULL,ipv6,AT_IPv6,fi->ws_fi->length,fi->ws_fi->ds_tvb,fi->ws_fi->start);
pushAddress(L,ipv6);
return 1;
}
case FT_FCWWN: {
Address fcwwn = (Address)g_malloc(sizeof(address));
alloc_address_tvb(NULL,fcwwn,AT_FCWWN,fi->ws_fi->length,fi->ws_fi->ds_tvb,fi->ws_fi->start);
pushAddress(L,fcwwn);
return 1;
}
case FT_IPXNET:{
Address ipx = (Address)g_malloc(sizeof(address));
alloc_address_tvb(NULL,ipx,AT_IPX,fi->ws_fi->length,fi->ws_fi->ds_tvb,fi->ws_fi->start);
pushAddress(L,ipx);
return 1;
}
case FT_ABSOLUTE_TIME:
case FT_RELATIVE_TIME: {
NSTime nstime = (NSTime)g_malloc(sizeof(nstime_t));
*nstime = *(NSTime)fvalue_get(&(fi->ws_fi->value));
pushNSTime(L,nstime);
return 1;
}
case FT_STRING:
case FT_STRINGZ: {
gchar* repr = fvalue_to_string_repr(NULL, &fi->ws_fi->value,FTREPR_DISPLAY,BASE_NONE);
if (repr)
{
lua_pushstring(L, repr);
wmem_free(NULL, repr);
}
else
{
luaL_error(L,"field cannot be represented as string because it may contain invalid characters");
}
return 1;
}
case FT_NONE:
if (fi->ws_fi->length > 0 && fi->ws_fi->rep) {
/* it has a length, but calling fvalue_get() on an FT_NONE asserts,
so get the label instead (it's a FT_NONE, so a label is what it basically is) */
lua_pushstring(L, fi->ws_fi->rep->representation);
return 1;
}
return 0;
case FT_BYTES:
case FT_UINT_BYTES:
case FT_REL_OID:
case FT_SYSTEM_ID:
case FT_OID:
{
ByteArray ba = g_byte_array_new();
g_byte_array_append(ba, (const guint8 *) fvalue_get(&fi->ws_fi->value),
fvalue_length(&fi->ws_fi->value));
pushByteArray(L,ba);
return 1;
}
case FT_PROTOCOL:
{
ByteArray ba = g_byte_array_new();
tvbuff_t* tvb = (tvbuff_t *) fvalue_get(&fi->ws_fi->value);
g_byte_array_append(ba, (const guint8 *)tvb_memdup(wmem_packet_scope(), tvb, 0,
tvb_captured_length(tvb)), tvb_captured_length(tvb));
pushByteArray(L,ba);
return 1;
}
case FT_GUID:
default:
luaL_error(L,"FT_ not yet supported");
return 1;
}
}
/* WSLUA_ATTRIBUTE FieldInfo_label RO The string representing this field. */
WSLUA_METAMETHOD FieldInfo__tostring(lua_State* L) {
/* The string representation of the field. */
FieldInfo fi = checkFieldInfo(L,1);
if (fi->ws_fi->value.ftype->val_to_string_repr) {
gchar* repr = NULL;
if (fi->ws_fi->hfinfo->type == FT_PROTOCOL || fi->ws_fi->hfinfo->type == FT_PCRE) {
repr = fvalue_to_string_repr(NULL, &fi->ws_fi->value,FTREPR_DFILTER,BASE_NONE);
}
else {
repr = fvalue_to_string_repr(NULL, &fi->ws_fi->value,FTREPR_DISPLAY,fi->ws_fi->hfinfo->display);
}
if (repr) {
lua_pushstring(L,repr);
/* fvalue_to_string_repr() wmem_alloc's the string's buffer */
wmem_free(NULL, repr);
}
else {
lua_pushstring(L,"(unknown)");
}
}
else if (fi->ws_fi->hfinfo->type == FT_NONE) {
lua_pushstring(L, "(none)");
}
else {
lua_pushstring(L,"(n/a)");
}
return 1;
}
/* WSLUA_ATTRIBUTE FieldInfo_display RO The string display of this field as seen in GUI. */
static int FieldInfo_get_display(lua_State* L) {
/* The display string of this field as seen in GUI. */
FieldInfo fi = checkFieldInfo(L,1);
gchar label_str[ITEM_LABEL_LENGTH+1];
gchar *label_ptr;
gchar *value_ptr;
if (!fi->ws_fi->rep) {
label_ptr = label_str;
proto_item_fill_label(fi->ws_fi, label_str);
} else
label_ptr = fi->ws_fi->rep->representation;
if (!label_ptr) return 0;
value_ptr = strstr(label_ptr, ": ");
if (!value_ptr) {
/* just use whatever's there */
lua_pushstring(L, label_ptr);
} else {
value_ptr += 2; /* get past the ': ' */
lua_pushstring(L, value_ptr);
}
return 1;
}
/* WSLUA_ATTRIBUTE FieldInfo_type RO The internal field type, a number which
matches one of the `ftype` values in `init.lua`.
@since 1.99.8
*/
static int FieldInfo_get_type(lua_State* L) {
FieldInfo fi = checkFieldInfo(L,1);
if (fi->ws_fi->hfinfo) {
lua_pushnumber(L, fi->ws_fi->hfinfo->type);
}
else {
lua_pushnil(L);
}
return 1;
}
/* WSLUA_ATTRIBUTE FieldInfo_source RO The source `Tvb` object the `FieldInfo` is derived
from, or nil if there is none.
@since 1.99.8
*/
static int FieldInfo_get_source(lua_State* L) {
FieldInfo fi = checkFieldInfo(L,1);
if (fi->ws_fi->ds_tvb) {
push_Tvb(L, fi->ws_fi->ds_tvb);
}
else {
lua_pushnil(L);
}
return 1;
}
/* WSLUA_ATTRIBUTE FieldInfo_range RO The `TvbRange` covering this field. */
static int FieldInfo_get_range(lua_State* L) {
/* The `TvbRange` covering this field. */
FieldInfo fi = checkFieldInfo(L,1);
if (push_TvbRange (L, fi->ws_fi->ds_tvb, fi->ws_fi->start, fi->ws_fi->length)) {
return 1;
}
return 0;
}
/* WSLUA_ATTRIBUTE FieldInfo_generated RO Whether this field was marked as generated (boolean). */
static int FieldInfo_get_generated(lua_State* L) {
/* Whether this field was marked as generated. */
FieldInfo fi = checkFieldInfo(L,1);
lua_pushboolean(L,FI_GET_FLAG(fi->ws_fi, FI_GENERATED));
return 1;
}
/* WSLUA_ATTRIBUTE FieldInfo_hidden RO Whether this field was marked as hidden (boolean).
@since 1.99.8
*/
static int FieldInfo_get_hidden(lua_State* L) {
FieldInfo fi = checkFieldInfo(L,1);
lua_pushboolean(L,FI_GET_FLAG(fi->ws_fi, FI_HIDDEN));
return 1;
}
/* WSLUA_ATTRIBUTE FieldInfo_is_url RO Whether this field was marked as being a URL (boolean).
@since 1.99.8
*/
static int FieldInfo_get_is_url(lua_State* L) {
FieldInfo fi = checkFieldInfo(L,1);
lua_pushboolean(L,FI_GET_FLAG(fi->ws_fi, FI_URL));
return 1;
}
/* WSLUA_ATTRIBUTE FieldInfo_little_endian RO Whether this field is little-endian encoded (boolean).
@since 1.99.8
*/
static int FieldInfo_get_little_endian(lua_State* L) {
FieldInfo fi = checkFieldInfo(L,1);
lua_pushboolean(L,FI_GET_FLAG(fi->ws_fi, FI_LITTLE_ENDIAN));
return 1;
}
/* WSLUA_ATTRIBUTE FieldInfo_big_endian RO Whether this field is big-endian encoded (boolean).
@since 1.99.8
*/
static int FieldInfo_get_big_endian(lua_State* L) {
FieldInfo fi = checkFieldInfo(L,1);
lua_pushboolean(L,FI_GET_FLAG(fi->ws_fi, FI_BIG_ENDIAN));
return 1;
}
/* WSLUA_ATTRIBUTE FieldInfo_name RO The filter name of this field.
@since 1.99.8
*/
static int FieldInfo_get_name(lua_State* L) {
/* The filter name of this field. */
FieldInfo fi = checkFieldInfo(L,1);
lua_pushstring(L,fi->ws_fi->hfinfo->abbrev);
return 1;
}
WSLUA_METAMETHOD FieldInfo__eq(lua_State* L) {
/* Checks whether lhs is within rhs. */
FieldInfo l = checkFieldInfo(L,1);
FieldInfo r = checkFieldInfo(L,2);
/* it is not an error if their ds_tvb are different... they're just not equal */
if (l->ws_fi->ds_tvb == r->ws_fi->ds_tvb &&
l->ws_fi->start == r->ws_fi->start &&
r->ws_fi->length == l->ws_fi->length) {
lua_pushboolean(L,1);
} else {
lua_pushboolean(L,0);
}
return 1;
}
WSLUA_METAMETHOD FieldInfo__le(lua_State* L) {
/* Checks whether the end byte of lhs is before the end of rhs. */
FieldInfo l = checkFieldInfo(L,1);
FieldInfo r = checkFieldInfo(L,2);
if (l->ws_fi->ds_tvb != r->ws_fi->ds_tvb)
WSLUA_ERROR(FieldInfo__le,"Data source must be the same for both fields");
if (r->ws_fi->start + r->ws_fi->length <= l->ws_fi->start + l->ws_fi->length) {
lua_pushboolean(L,1);
} else {
lua_pushboolean(L,0);
}
return 1;
}
WSLUA_METAMETHOD FieldInfo__lt(lua_State* L) {
/* Checks whether the end byte of rhs is before the beginning of rhs. */
FieldInfo l = checkFieldInfo(L,1);
FieldInfo r = checkFieldInfo(L,2);
if (l->ws_fi->ds_tvb != r->ws_fi->ds_tvb) {
WSLUA_ERROR(FieldInfo__lt,"Data source must be the same for both fields");
return 0;
}
if (r->ws_fi->start + r->ws_fi->length < l->ws_fi->start) {
lua_pushboolean(L,1);
} else {
lua_pushboolean(L,0);
}
return 1;
}
/* Gets registered as metamethod automatically by WSLUA_REGISTER_META */
static int FieldInfo__gc(lua_State* L) {
FieldInfo fi = toFieldInfo(L,1);
if (!fi) return 0;
if (!fi->expired)
fi->expired = TRUE;
else
/* do NOT free fi->ws_fi */
g_free(fi);
return 0;
}
/* This table is ultimately registered as a sub-table of the class' metatable,
* and if __index/__newindex is invoked then it calls the appropriate function
* from this table for getting/setting the members.
*/
WSLUA_ATTRIBUTES FieldInfo_attributes[] = {
WSLUA_ATTRIBUTE_ROREG(FieldInfo,range),
WSLUA_ATTRIBUTE_ROREG(FieldInfo,generated),
WSLUA_ATTRIBUTE_ROREG(FieldInfo,hidden),
WSLUA_ATTRIBUTE_ROREG(FieldInfo,is_url),
WSLUA_ATTRIBUTE_ROREG(FieldInfo,little_endian),
WSLUA_ATTRIBUTE_ROREG(FieldInfo,big_endian),
WSLUA_ATTRIBUTE_ROREG(FieldInfo,name),
WSLUA_ATTRIBUTE_ROREG(FieldInfo,display),
WSLUA_ATTRIBUTE_ROREG(FieldInfo,type),
WSLUA_ATTRIBUTE_ROREG(FieldInfo,source),
{ "label", FieldInfo__tostring, NULL },
{ "value", FieldInfo__call, NULL },
{ "tvb", FieldInfo_get_range, NULL },
{ "len", FieldInfo__len, NULL },
{ "offset", FieldInfo__unm, NULL },
{ NULL, NULL, NULL }
};
WSLUA_META FieldInfo_meta[] = {
WSLUA_CLASS_MTREG(FieldInfo,tostring),
WSLUA_CLASS_MTREG(FieldInfo,call),
WSLUA_CLASS_MTREG(FieldInfo,len),
WSLUA_CLASS_MTREG(FieldInfo,unm),
WSLUA_CLASS_MTREG(FieldInfo,eq),
WSLUA_CLASS_MTREG(FieldInfo,le),
WSLUA_CLASS_MTREG(FieldInfo,lt),
{ NULL, NULL }
};
int FieldInfo_register(lua_State* L) {
WSLUA_REGISTER_META(FieldInfo);
WSLUA_REGISTER_ATTRIBUTES(FieldInfo);
return 0;
}
WSLUA_FUNCTION wslua_all_field_infos(lua_State* L) {
/*
Obtain all fields from the current tree. Note this only gets whatever fields the underlying
dissectors have filled in for this packet at this time - there may be fields applicable to
the packet that simply aren't being filled in because at this time they're not needed for anything.
This function only gets what the C-side code has currently populated, not the full list.
*/
GPtrArray* found;
int items_found = 0;
guint i;
if (! lua_tree || ! lua_tree->tree ) {
WSLUA_ERROR(wslua_all_field_infos,"Cannot be called outside a listener or dissector");
return 0;
}
found = proto_all_finfos(lua_tree->tree);
if (found) {
for (i=0; i<found->len; i++) {
push_FieldInfo(L, (field_info *)g_ptr_array_index(found,i));
items_found++;
}
g_ptr_array_free(found,TRUE);
}
return items_found;
}
WSLUA_CLASS_DEFINE(Field,FAIL_ON_NULL("Field"));
/*
A Field extractor to to obtain field values. A `Field` object can only be created *outside* of
the callback functions of dissectors, post-dissectors, heuristic-dissectors, and taps.
Once created, it is used *inside* the callback functions, to generate a `FieldInfo` object.
*/
static GPtrArray* wanted_fields = NULL;
static dfilter_t* wslua_dfilter = NULL;
/* We use a fake dfilter for Lua field extractors, so that
* epan_dissect_run() will populate the fields. This won't happen
* if the passed-in edt->tree is NULL, which it will be if the
* proto_tree isn't created by epan_dissect_init(). But that's by
* design - if shark doesn't pass in a proto_tree, it's probably for
* a good reason and we shouldn't override that. (right?)
*/
void wslua_prime_dfilter(epan_dissect_t *edt) {
if (wslua_dfilter && edt && edt->tree) {
dfilter_prime_proto_tree(wslua_dfilter, edt->tree);
}
}
/* Check if we have any registered field extractors. */
gboolean wslua_has_field_extractors(void) {
return (wslua_dfilter && dfilter_has_interesting_fields(wslua_dfilter));
}
/*
* field extractor registration is tricky, In order to allow
* the user to define them in the body of the script we will
* populate the Field value with a pointer of the abbrev of it
* to later replace it with the hfi.
*
* This will be added to the wanted_fields array that will
* exists only while they can be defined, and be cleared right
* after the fields are primed.
*/
static gboolean fake_tap = FALSE;
void lua_prime_all_fields(proto_tree* tree _U_) {
GString* fake_tap_filter = g_string_new("frame");
guint i;
gchar *err_msg;
for(i=0; i < wanted_fields->len; i++) {
Field f = (Field)g_ptr_array_index(wanted_fields,i);
gchar* name = *((gchar**)f);
*f = proto_registrar_get_byname(name);
if (!*f) {
report_failure("Could not find field `%s'",name);
*f = NULL;
g_free(name);
continue;
}
g_free(name);
g_string_append_printf(fake_tap_filter," || %s",(*f)->abbrev);
fake_tap = TRUE;
}
g_ptr_array_free(wanted_fields,TRUE);
wanted_fields = NULL;
if (fake_tap && fake_tap_filter->len > strlen("frame")) {
/* a boring tap :-) */
GString* error = register_tap_listener("frame",
&fake_tap,
fake_tap_filter->str,
0, /* XXX - do we need the protocol tree or columns? */
NULL, NULL, NULL);
if (error) {
report_failure("while registering lua_fake_tap:\n%s",error->str);
g_string_free(error,TRUE);
} else if (!dfilter_compile(fake_tap_filter->str, &wslua_dfilter, &err_msg)) {
report_failure("while compiling dfilter \"%s\" for wslua: %s", fake_tap_filter->str, err_msg);
g_free(err_msg);
}
}
g_string_free(fake_tap_filter, TRUE);
}
WSLUA_CONSTRUCTOR Field_new(lua_State *L) {
/*
Create a Field extractor.
*/
#define WSLUA_ARG_Field_new_FIELDNAME 1 /* The filter name of the field (e.g. ip.addr) */
const gchar* name = luaL_checkstring(L,WSLUA_ARG_Field_new_FIELDNAME);
Field f;
if (!proto_registrar_get_byname(name) && !wslua_is_field_available(L, name)) {
WSLUA_ARG_ERROR(Field_new,FIELDNAME,"a field with this name must exist");
return 0;
}
if (!wanted_fields) {
WSLUA_ERROR(Field_new,"A Field extractor must be defined before Taps or Dissectors get called");
return 0;
}
f = (Field)g_malloc(sizeof(void*));
*f = (header_field_info*)(void*)g_strdup(name); /* cheating */
g_ptr_array_add(wanted_fields,f);
pushField(L,f);
WSLUA_RETURN(1); /* The field extractor */
}
WSLUA_CONSTRUCTOR Field_list(lua_State *L) {
/* Gets a Lua array table of all registered field filter names.
NOTE: this is an expensive operation, and should only be used for troubleshooting.
@since 1.11.3
*/
void *cookie, *cookie2;
int i = -1;
int count = 0;
header_field_info *hfinfo = NULL;
lua_newtable(L);
for (i = proto_get_first_protocol(&cookie); i != -1;
i = proto_get_next_protocol(&cookie)) {
for (hfinfo = proto_get_first_protocol_field(i, &cookie2); hfinfo != NULL;
hfinfo = proto_get_next_protocol_field(i, &cookie2)) {
if (hfinfo->same_name_prev_id != -1) /* ignore duplicate names */
continue;
count++;
lua_pushstring(L,hfinfo->abbrev);
lua_rawseti(L,1,count);
}
}
WSLUA_RETURN(1); /* The array table of field filter names */
}
/* the following is used in Field_get_xxx functions later */
#define GET_HFINFO_MEMBER(luafunc, member) \
if (wanted_fields) { \
/* before registration, so it's a gchar** of the abbrev */ \
const gchar* name = (const gchar*) *fi; \
if (name) { \
hfinfo = proto_registrar_get_byname(name); \
if (!hfinfo) { \
/* could be a Lua-created field */ \
ProtoField pf = wslua_is_field_available(L, name); \
if (pf) { \
luafunc(L, pf->member); \
return 1; \
} \
} \
} else { \
luaL_error(L, "Field." #member ": unknown field"); \
return 0; \
} \
} else { \
hfinfo = *fi; \
} \
\
if (hfinfo) { \
luafunc(L,hfinfo->member); \
} else \
lua_pushnil(L)
/* WSLUA_ATTRIBUTE Field_name RO The filter name of this field, or nil.
@since 1.99.8
*/
static int Field_get_name(lua_State* L) {
Field fi = checkField(L,1);
header_field_info* hfinfo = NULL;
GET_HFINFO_MEMBER(lua_pushstring, abbrev);
return 1;
}
/* WSLUA_ATTRIBUTE Field_display RO The full display name of this field, or nil.
@since 1.99.8
*/
static int Field_get_display(lua_State* L) {
Field fi = checkField(L,1);
header_field_info* hfinfo = NULL;
GET_HFINFO_MEMBER(lua_pushstring, name);
return 1;
}
/* WSLUA_ATTRIBUTE Field_type RO The `ftype` of this field, or nil.
@since 1.99.8
*/
static int Field_get_type(lua_State* L) {
Field fi = checkField(L,1);
header_field_info* hfinfo = NULL;
GET_HFINFO_MEMBER(lua_pushnumber, type);
return 1;
}
WSLUA_METAMETHOD Field__call (lua_State* L) {
/* Obtain all values (see `FieldInfo`) for this field. */
Field f = checkField(L,1);
header_field_info* in = *f;
int items_found = 0;
if (! in) {
luaL_error(L,"invalid field");
return 0;
}
if (! lua_pinfo ) {
WSLUA_ERROR(Field__call,"Fields cannot be used outside dissectors or taps");
return 0;
}
while (in) {
GPtrArray* found = proto_get_finfo_ptr_array(lua_tree->tree, in->id);
guint i;
if (found) {
for (i=0; i<found->len; i++) {
push_FieldInfo(L, (field_info *) g_ptr_array_index(found,i));
items_found++;
}
}
in = (in->same_name_prev_id != -1) ? proto_registrar_get_nth(in->same_name_prev_id) : NULL;
}
WSLUA_RETURN(items_found); /* All the values of this field */
}
WSLUA_METAMETHOD Field__tostring(lua_State* L) {
/* Obtain a string with the field filter name. */
Field f = checkField(L,1);
if (wanted_fields) {
lua_pushstring(L,*((gchar**)f));
} else {
lua_pushstring(L,(*f)->abbrev);
}
return 1;
}
static int Field__gc(lua_State* L _U_) {
/* do NOT free Field */
return 0;
}
WSLUA_ATTRIBUTES Field_attributes[] = {
WSLUA_ATTRIBUTE_ROREG(Field,name),
WSLUA_ATTRIBUTE_ROREG(Field,display),
WSLUA_ATTRIBUTE_ROREG(Field,type),
{ NULL, NULL, NULL }
};
WSLUA_METHODS Field_methods[] = {
WSLUA_CLASS_FNREG(Field,new),
WSLUA_CLASS_FNREG(Field,list),
{ NULL, NULL }
};
WSLUA_META Field_meta[] = {
WSLUA_CLASS_MTREG(Field,tostring),
WSLUA_CLASS_MTREG(Field,call),
{ NULL, NULL }
};
int Field_register(lua_State* L) {
wanted_fields = g_ptr_array_new();
WSLUA_REGISTER_CLASS(Field);
WSLUA_REGISTER_ATTRIBUTES(Field);
outstanding_FieldInfo = g_ptr_array_new();
return 0;
}
int wslua_deregister_fields(lua_State* L _U_) {
if (wslua_dfilter) {
dfilter_free(wslua_dfilter);
wslua_dfilter = NULL;
}
if (fake_tap) {
remove_tap_listener(&fake_tap);
fake_tap = FALSE;
}
return 0;
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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