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path: root/cooker/parse.c
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-rw-r--r--cooker/parse.c273
1 files changed, 48 insertions, 225 deletions
diff --git a/cooker/parse.c b/cooker/parse.c
index 0a87088..09b1e46 100644
--- a/cooker/parse.c
+++ b/cooker/parse.c
@@ -12,260 +12,80 @@
#include "calls.h"
#include "cooker.h"
#include "gluten.h"
+#include "match.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 num *desc, JSON_Value *value)
+static void handle_call(struct gluten_ctx *g, 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 void parse_match_expr_value(union desc desc, enum type type,
- JSON_Value *value, union value *out)
-{
- if (TYPE_IS_NUM(type))
- out->v_num = parse_match_expr_num(desc.d_num, value);
-}
-
-/**
- * parse_match_select() - Get description and type for selected value
- * @s: Possible selection choices
- * @v: Selector value
- * @type: Type of selected value, set on return
- * @desc: Description of selected value, set on return
- */
-static void parse_match_select(struct select *s, union value v,
- enum type *type, union desc *desc)
-{
- if (TYPE_IS_NUM(s->field->type)) {
- struct select_num *d_num;
-
- for (d_num = s->desc.d_num; d_num->type; d_num++) {
- if (d_num->value == v.v_num) {
- *type = d_num->type;
- *desc = d_num->desc;
- return;
- }
- }
-
- if (!d_num->type)
- die(" No match for numeric selector %i", v.v_num);
- }
-
- die(" not supported yet");
-}
-
-/*
- * parse_match_arg()
- * load argument
- * parse_match_key()
- * compound types? demux, parse_match_expr
- * parse_match_expr
- * in/all/not/false-true array: demux, parse_match_expr_{num,string}
- * parse_match_expr_{num,string}
- *
- * at terminal values
- * store ref *pointers*! no copies
- * emit additional bpf statement if syscall arg is also terminal
-*/
-static int parse_match_key(struct gluten_ctx *g, int index, enum type type,
- union desc desc, JSON_Value *value)
-{
- JSON_Object *tmp;
- const char *ref;
-
- if (type == SELECT) {
- struct gluten_offset base_offset, const_offset;
- struct select *select = desc.d_select;
- struct field *field = select->field;
- JSON_Value *selector;
- union value v;
-
- if (!(tmp = json_value_get_object(value)))
- die(" no object for compound value");
-
- if (!(selector = json_object_get_value(tmp, field->name)))
- die(" missing selector for '%s'", field->name);
-
- parse_match_expr_value(field->desc, field->type, selector, &v);
-
- base_offset = g->match_dst[index].offset;
- const_offset = emit_data(g, field->type, &v);
- emit_cmp_field(g, CMP_NE, field, base_offset, const_offset,
- NEXT_BLOCK);
-
- parse_match_select(select, v, &type, &desc);
- }
-
- if (json_value_get_type(value) == JSONObject &&
- (tmp = json_value_get_object(value)) &&
- (ref = json_object_get_string(tmp, "ref"))) {
- if (TYPE_IS_COMPOUND(type))
- die("Reference '%s' to compound value");
-
- debug(" setting reference '%s'", ref);
- value = json_object_get_value(tmp, "value");
-
- emit_load(g, gluten_alloc_type(g, type), index, type);
- }
-
- /* Nothing to match on: just store as reference */
- if (!value)
- return 0;
-
- switch (type) {
- case INTFLAGS:
- case LONGFLAGS:
- case U32FLAGS:
- /* fetch/combine expr algebra loop */
- case INTMASK:
- /* calculate mask first */
- case INT:
- case LONG:
- case U32:
- parse_match_expr_num(desc.d_num, value);
- //emit_cmp(...);
- default:
- ;
- }
-
- return 0;
+ (void)g;
+ (void)value;
}
-static int parse_match_arg(struct gluten_ctx *g, const char *name,
- JSON_Value *value, struct arg *a)
+static void handle_inject(struct gluten_ctx *g, JSON_Value *value)
{
- debug(" Parsing match argument %s", name);
-
- parse_match_load(g, a);
- parse_match_key(g, a->pos, a->type, a->desc, value);
-
- return 0;
+ (void)g;
+ (void)value;
}
-static int parse_match(struct gluten_ctx *g, JSON_Object *obj, struct arg *args)
+static void handle_limit(struct gluten_ctx *g, JSON_Value *value)
{
- 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;
+ (void)g;
+ (void)value;
}
-static int parse_matches(struct gluten_ctx *g, JSON_Value *value)
+static void handle_return(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;
-
- 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;
+ (void)g;
+ (void)value;
}
-static int parse_call(struct gluten_ctx *g, JSON_Value *value)
+static void handle_block(struct gluten_ctx *g, JSON_Value *value)
{
(void)g;
(void)value;
- return 0;
}
-static int parse_inject(struct gluten_ctx *g, JSON_Value *value)
+static void handle_context(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 },
+/**
+ * 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_call },
+ { "inject", handle_inject },
+ { "limit", handle_limit },
+ { "return", handle_return },
+ { "block", handle_block },
+ { "context", handle_context },
{ NULL, NULL },
};
-static int parse_block(struct gluten_ctx *g, JSON_Object *block)
+/**
+ * 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;
@@ -285,10 +105,15 @@ static int parse_block(struct gluten_ctx *g, JSON_Object *block)
die(" Invalid rule type: \"%s\"", type);
}
- return 0;
+ link_block(g);
}
-int parse_file(struct gluten_ctx *g, const char *path)
+/**
+ * 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;
@@ -306,6 +131,4 @@ int parse_file(struct gluten_ctx *g, const char *path)
debug("Parsing block %i", i);
parse_block(g, obj);
}
-
- return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-05 16:12:43 +0000