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// 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 "emit.h"
#include "util.h"
#include "calls/net.h"
struct rule_parser {
const char *type;
int (*fn)(struct gluten_ctx *g, JSON_Value *value);
};
static int parse_match_load(struct gluten_ctx *g, struct arg *a)
{
if (!a->size || g->match_dst[a->pos].len)
return 0;
g->match_dst[a->pos].offset = gluten_alloc(g, a->size);
g->match_dst[a->pos].len = a->size;
emit_load(g, g->match_dst[a->pos].offset, a->pos, a->size);
return 0;
}
static long long parse_match_expr_num(struct arg_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;
}
static int parse_match_key(struct gluten_ctx *g, int index, enum arg_type type,
union arg_value desc, JSON_Value *value)
{
JSON_Object *tmp;
const char *ref;
(void)index;
if (json_value_get_type(value) == JSONObject &&
(tmp = json_value_get_object(value)) &&
(ref = json_object_get_string(tmp, "ref"))) {
debug(" setting reference '%s'", ref);
gluten_alloc_type(g, type);
value = json_object_get_value(tmp, "value");
}
if (!value)
return 0;
switch (type) {
case ARG_INTFLAGS:
case ARG_LONGFLAGS:
case ARG_U32FLAGS:
/* fetch/combine expr algebra loop */
case ARG_INTMASK:
/* calculate mask first */
case ARG_INT:
case ARG_LONG:
case ARG_U32:
parse_match_expr_num(desc.d_num, value);
//emit_cmp(...);
default:
;
}
return 0;
}
static int parse_match_arg(struct gluten_ctx *g, const char *name,
JSON_Value *value, struct arg *a)
{
debug(" Parsing match argument %s", name);
parse_match_load(g, a);
parse_match_key(g, a->pos, a->type, a->desc, value);
return 0;
}
static int parse_match(struct gluten_ctx *g, JSON_Object *obj, struct arg *args)
{
unsigned count = 0;
struct arg *a;
for (a = args; a->name; a++) {
JSON_Value *value;
if ((value = json_object_get_value(obj, a->name))) {
count++;
parse_match_arg(g, a->name, value, a);
}
}
if (count != json_object_get_count(obj))
die(" Stray elements in match");
return 0;
}
static int parse_matches(struct gluten_ctx *g, JSON_Value *value)
{
JSON_Array *matches = json_value_get_array(value);
unsigned i;
for (i = 0; i < json_array_get_count(matches); i++) {
JSON_Object *match, *args;
struct call **set, *call;
const char *name;
g->lr = g->ip;
g->sp = 0;
match = json_array_get_object(matches, i);
name = json_object_get_name(match, 0);
args = json_object_get_object(match, name);
debug(" Parsing match %i: %s", i, name);
for (set = call_sets, call = set[0]; *set; call++) {
if (!call->name) {
set++;
continue;
}
if (!strcmp(name, call->name)) {
debug(" Found handler for %s", name);
emit_nr(g, call->number);
parse_match(g, args, call->args);
break;
}
}
if (!*set)
die(" Unknown system call: %s", name);
}
return 0;
}
static int parse_call(struct gluten_ctx *g, JSON_Value *value)
{
(void)g;
(void)value;
return 0;
}
static int parse_inject(struct gluten_ctx *g, JSON_Value *value)
{
(void)g;
(void)value;
return 0;
}
struct rule_parser parsers[] = {
{ "match", parse_matches },
{ "call", parse_call },
{ "inject", parse_inject },
{ NULL, NULL },
};
static int parse_block(struct gluten_ctx *g, JSON_Object *block)
{
unsigned i;
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);
}
return 0;
}
int 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);
}
return 0;
}
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