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
|
// SPDX-License-Identifier: GPL-3.0-or-later
/* seitan - Syscall Expressive Interpreter, Transformer and Notifier
*
* cooker/parse.c - JSON recipe parsing
*
* Copyright 2023 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*/
#include "parson.h"
#include "calls.h"
#include "cooker.h"
#include "gluten.h"
#include "call.h"
#include "match.h"
#include "emit.h"
#include "util.h"
static void handle_inject(struct gluten_ctx *g, JSON_Value *value)
{
(void)g;
(void)value;
}
static void handle_limit(struct gluten_ctx *g, JSON_Value *value)
{
(void)g;
(void)value;
}
static void handle_return(struct gluten_ctx *g, JSON_Value *value)
{
union value v = { .v_u64 = json_value_get_number(value) };
emit_return(g, emit_data(g, U64, sizeof(v.v_u64), &v));
}
static void handle_block(struct gluten_ctx *g, JSON_Value *value)
{
emit_block(g, json_value_get_number(value));
}
static void handle_context(struct gluten_ctx *g, JSON_Value *value)
{
(void)g;
(void)value;
}
/**
* struct rule_parser - Parsing handler for JSON rule type
* @type: JSON key name
* @fn: Parsing function
*/
struct rule_parser {
const char *type;
void (*fn)(struct gluten_ctx *g, JSON_Value *value);
} parsers[] = {
{ "match", handle_matches },
{ "call", handle_calls },
{ "inject", handle_inject },
{ "limit", handle_limit },
{ "return", handle_return },
{ "block", handle_block },
{ "context", handle_context },
{ NULL, NULL },
};
/**
* value_get_num() - Get numeric value from description matching JSON input
* @desc: Description of possible values from model
* @value: JSON value
*
* Return: numeric value
*/
long long value_get_num(struct num *desc, JSON_Value *value)
{
const char *s = NULL;
long long n;
if (desc) {
s = json_value_get_string(value);
for (; desc->name && s && strcmp(s, desc->name); desc++);
if (s && !desc->name)
die(" Invalid value %s", s);
n = desc->value;
}
if (!s) {
if (json_value_get_type(value) != JSONNumber)
die(" Invalid value type");
n = json_value_get_number(value);
}
return n;
}
/**
* value_get() - Get generic value from description matching JSON input
* @desc: Description of possible values from model
* @type: Data type from model
* @value: JSON value
* @out: Corresponding bytecode value, set on return
*/
void value_get(union desc desc, enum type type, JSON_Value *value,
union value *out)
{
if (TYPE_IS_NUM(type))
out->v_num = value_get_num(desc.d_num, value);
}
/**
* select_field() - Select field based on value and description
* @g: gluten context
* @pos: Index of syscall argument being parsed
* @s: Possible selection choices
* @v: Selector value
*
* Return: pointer to field, NULL if selector refers to a different argument
*/
struct field *select_field(struct gluten_ctx *g, int pos,
struct select *s, union value v)
{
if (TYPE_IS_NUM(s->field->type)) {
struct select_num *d_num;
for (d_num = s->desc.d_num; d_num->target.f.type; d_num++) {
if (d_num->value == v.v_num) {
if (d_num->target.pos == pos)
return &d_num->target.f;
if (g) {
pos = d_num->target.pos;
g->selected_arg[pos] = &d_num->target;
}
return NULL;
}
}
if (!d_num->target.f.type)
die(" No match for numeric selector %i", v.v_num);
}
die(" not supported yet");
}
/**
* parse_block() - Parse a transformation block with rules
* @g: gluten context
* @block: Array of rules in block
*/
static void parse_block(struct gluten_ctx *g, JSON_Object *block)
{
unsigned i;
memset(g->selected_arg, 0, sizeof(g->selected_arg));
memset(g->tags, 0, sizeof(g->tags));
g->lr = g->ip;
for (i = 0; i < json_object_get_count(block); i++) {
struct rule_parser *parser;
JSON_Value *rule;
const char *type;
type = json_object_get_name(block, i);
rule = json_object_get_value(block, type);
for (parser = parsers; parser->type; parser++) {
if (!strcmp(type, parser->type)) {
parser->fn(g, rule);
break;
}
}
if (!parser->type)
die(" Invalid rule type: \"%s\"", type);
}
link_block(g);
}
/**
* parse_file() - Entry point for parsing of a JSON input file
* @g: gluten context
* @path: Input file path
*/
void parse_file(struct gluten_ctx *g, const char *path)
{
JSON_Array *blocks;
JSON_Value *root;
JSON_Object *obj;
unsigned i;
root = json_parse_file_with_comments(path);
if (json_value_get_type(root) != JSONArray)
die("Invalid input file %s", path);
blocks = json_value_get_array(root);
for (i = 0; i < json_array_get_count(blocks); i++) {
obj = json_array_get_object(blocks, i);
debug("Parsing block %i", i);
parse_block(g, obj);
}
}
|
