1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
|
###################################################
# parser generator for IDL structures
# Copyright tpot@samba.org 2001
# Copyright tridge@samba.org 2000
# released under the GNU GPL
package IdlEParser;
use strict;
my($res);
sub has_property($$)
{
my($props) = shift;
my($p) = shift;
foreach my $d (@{$props}) {
if (ref($d) ne "HASH") {
return 1, if ($d eq $p);
return 1, if ($d eq "in,out" && ($p eq "in" || $p eq "out"));
} else {
foreach my $k (keys %{$d}) {
return $d->{$k}, if ($k eq $p);
}
}
}
return 0;
}
#####################################################################
# parse a properties list
sub ParseProperties($)
{
my($props) = shift;
foreach my $d (@{$props}) {
if (ref($d) ne "HASH") {
$res .= "[$d] ";
} else {
foreach my $k (keys %{$d}) {
$res .= "[$k($d->{$k})] ";
}
}
}
}
#####################################################################
# parse an array - called in buffers context
sub ParseArray($)
{
my($elt) = shift;
$res .= "\tfor (i = 0; i < count; i++) {\n";
if (util::is_scalar_type($elt)) {
$res .= "\t\toffset = prs_$elt->{TYPE}(tvb, offset, pinfo, tree, NULL, \"$elt->{NAME});\n";
$res .= "\t}\n\n";
} else {
$res .= "\t\toffset = prs_$elt->{TYPE}(tvb, offset, pinfo, tree, \"PARSE_SCALARS\", \"$elt->{NAME}\");\n";
$res .= "\t}\n\n";
$res .= "\tfor (i = 0; i < count; i++) {\n";
$res .= "\t\toffset = prs_$elt->{TYPE}(tvb, offset, pinfo, tree, \"PARSE_BUFFERS\", \"$elt->{NAME}\");\n";
$res .= "\t}\n\n";
}
}
#####################################################################
# parse a structure element
sub ParseElement($$)
{
my($elt) = shift;
my($flags) = shift;
# Arg is a policy handle
if (util::has_property($elt, "context_handle")) {
$res .= "\toffset = prs_policy_hnd(tvb, offset, pinfo, tree);\n";
return;
}
# Parse type
if ($flags =~ /scalars/) {
# Pointers are scalars
if ($elt->{POINTERS}) {
$res .= "\t\toffset = prs_ptr(tvb, offset, pinfo, tree, &ptr_$elt->{NAME}, \"$elt->{NAME}\");\n";
} else {
# Simple type are scalars too
if (util::is_scalar_type($elt->{TYPE})) {
$res .= "\t\toffset = prs_$elt->{TYPE}(tvb, offset, pinfo, tree, NULL, \"$elt->{NAME}\");\n\n";
}
}
}
if ($flags =~ /buffers/) {
# Scalars are not buffers, except if they are pointed to
if (!util::is_scalar_type($elt->{TYPE}) || $elt->{POINTERS}) {
# If we have a pointer, check it
if ($elt->{POINTERS}) {
$res .= "\t\tif (ptr_$elt->{NAME})\n\t";
}
if (util::has_property($elt, "size_is")) {
ParseArray($elt);
} else {
$res .= "\t\toffset = prs_$elt->{TYPE}(tvb, offset, pinfo, tree, ";
if (util::is_scalar_type($elt->{TYPE})) {
$res .= "NULL, ";
} else {
$res .= "flags, ";
}
$res .= "\"$elt->{NAME}\");\n\n";
}
}
}
return;
}
#####################################################################
# parse a struct
sub ParseStruct($)
{
my($struct) = shift;
if (defined $struct->{ELEMENTS}) {
# Parse scalars
$res .= "\tif (flags & PARSE_SCALARS) {\n";
foreach my $e (@{$struct->{ELEMENTS}}) {
ParseElement($e, "scalars");
}
$res .= "\t}\n\n";
# Parse buffers
$res .= "\tif (flags & PARSE_BUFFERS) {\n";
foreach my $e (@{$struct->{ELEMENTS}}) {
ParseElement($e, "buffers");
}
$res .= "\t}\n\n";
}
}
#####################################################################
# parse a union element
sub ParseUnionElement($)
{
my($element) = shift;
$res .= "\tcase $element->{DATA}->{NAME}: \n";
$res .= "\t\toffset = prs_$element->{DATA}->{TYPE}(tvb, offset, pinfo, tree, \"$element->{DATA}->{NAME}\");\n\t\tbreak;\n";
}
#####################################################################
# parse a union
sub ParseUnion($)
{
my($union) = shift;
$res .= "\tswitch (level) {\n";
(defined $union->{PROPERTIES}) && ParseProperties($union->{PROPERTIES});
foreach my $e (@{$union->{DATA}}) {
ParseUnionElement($e);
}
$res .= "\t}\n";
}
#####################################################################
# parse a type
sub ParseType($)
{
my($data) = shift;
if (ref($data) eq "HASH") {
($data->{TYPE} eq "STRUCT") &&
ParseStruct($data);
($data->{TYPE} eq "UNION") &&
ParseUnion($data);
} else {
$res .= "$data";
}
}
#####################################################################
# parse a typedef
sub ParseTypedef($)
{
my($typedef) = shift;
$res .= "static int prs_$typedef->{NAME}(tvbuff_t *tvb, int offset,\
\tpacket_info *pinfo, proto_tree *tree, int flags, char *name)\n{\n";
ParseType($typedef->{DATA});
$res .= "\treturn offset;\n";
$res .= "}\n\n";
}
#####################################################################
# parse a function
sub ParseFunctionArg($$)
{
my($arg) = shift;
my($io) = shift; # "in" or "out"
if (util::has_property($arg, $io)) {
# For some reason, pointers to elements in function definitions
# aren't parsed.
if (defined($arg->{POINTERS}) && !util::is_scalar_type($arg->{TYPE})) {
$arg->{POINTERS} -= 1, if ($arg->{POINTERS} > 0);
delete($arg->{POINTERS}), if ($arg->{POINTERS} == 0);
}
ParseElement($arg, "scalars|buffers");
}
}
#####################################################################
# parse a function
sub ParseFunction($)
{
my($function) = shift;
# Input function
$res .= "static int $function->{NAME}_q(tvbuff_t *tvb, int offset,\
\tpacket_info *pinfo, proto_tree *tree, char *drep)\n{\n";
foreach my $arg (@{$function->{DATA}}) {
ParseFunctionArg($arg, "in");
}
$res .= "\n\treturn offset;\n}\n\n";
# Output function
$res .= "static int $function->{NAME}_r(tvbuff_t *tvb, int offset,\
\tpacket_info *pinfo, proto_tree *tree, char *drep)\n{\n";
foreach my $arg (@{$function->{DATA}}) {
ParseFunctionArg($arg, "out");
}
$res .= "\n\toffset = prs_ntstatus(tvb, offset, pinfo, tree);\n";
$res .= "\n\treturn offset;\n}\n\n";
}
#####################################################################
# parse the interface definitions
sub ParseInterface($)
{
my($interface) = shift;
my($data) = $interface->{DATA};
foreach my $d (@{$data}) {
($d->{TYPE} eq "TYPEDEF") &&
ParseTypedef($d);
($d->{TYPE} eq "FUNCTION") &&
ParseFunction($d);
}
}
#####################################################################
# parse a parsed IDL structure back into an IDL file
sub Parse($)
{
my($idl) = shift;
$res = "/* parser auto-generated by pidl */\n\n";
foreach my $x (@{$idl}) {
($x->{TYPE} eq "INTERFACE") &&
ParseInterface($x);
}
return $res;
}
1;
|
