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json.c
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#define _GNU_SOURCE
#include <string.h>
#include <expression.h>
#include <list.h>
#include <netlink.h>
#include <rule.h>
#include <rt.h>
#include <netdb.h>
#include <netinet/icmp6.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_log.h>
#include <linux/netfilter/nf_nat.h>
#include <linux/netfilter/nf_tables.h>
#include <linux/netfilter/nf_synproxy.h>
#include <linux/xfrm.h>
#include <pwd.h>
#include <grp.h>
#include <jansson.h>
#include <syslog.h>
#ifdef DEBUG
#define __json_pack json_pack
#define json_pack(...) ({ \
json_t *__out = __json_pack(__VA_ARGS__); \
assert(__out); \
__out; \
})
#endif
static json_t *expr_print_json(const struct expr *expr, struct output_ctx *octx)
{
const struct expr_ops *ops;
char buf[1024];
FILE *fp;
ops = expr_ops(expr);
if (ops->json)
return ops->json(expr, octx);
printf("warning: expr ops %s have no json callback\n", expr_name(expr));
fp = octx->output_fp;
octx->output_fp = fmemopen(buf, 1024, "w");
ops->print(expr, octx);
fclose(octx->output_fp);
octx->output_fp = fp;
return json_pack("s", buf);
}
static json_t *set_dtype_json(const struct expr *key)
{
char *namedup = xstrdup(key->dtype->name), *tok;
json_t *root = NULL;
tok = strtok(namedup, " .");
while (tok) {
json_t *jtok = json_string(xstrdup(tok));
if (!root)
root = jtok;
else if (json_is_string(root))
root = json_pack("[o, o]", root, jtok);
else
json_array_append_new(root, jtok);
tok = strtok(NULL, " .");
}
xfree(namedup);
return root;
}
static json_t *set_print_json(struct output_ctx *octx, const struct set *set)
{
json_t *root, *tmp;
const char *type, *datatype_ext = NULL;
if (set_is_datamap(set->flags)) {
type = "map";
datatype_ext = set->data->dtype->name;
} else if (set_is_objmap(set->flags)) {
type = "map";
datatype_ext = obj_type_name(set->objtype);
} else if (set_is_meter(set->flags)) {
type = "meter";
} else {
type = "set";
}
root = json_pack("{s:s, s:s, s:s, s:o, s:I}",
"family", family2str(set->handle.family),
"name", set->handle.set.name,
"table", set->handle.table.name,
"type", set_dtype_json(set->key),
"handle", set->handle.handle.id);
if (set->comment)
json_object_set_new(root, "comment", json_string(set->comment));
if (datatype_ext)
json_object_set_new(root, "map", json_string(datatype_ext));
if (!(set->flags & (NFT_SET_CONSTANT))) {
if (set->policy != NFT_SET_POL_PERFORMANCE) {
tmp = json_pack("s", set_policy2str(set->policy));
json_object_set_new(root, "policy", tmp);
}
if (set->desc.size) {
tmp = json_pack("i", set->desc.size);
json_object_set_new(root, "size", tmp);
}
}
tmp = json_array();
if (set->flags & NFT_SET_CONSTANT)
json_array_append_new(tmp, json_pack("s", "constant"));
if (set->flags & NFT_SET_INTERVAL)
json_array_append_new(tmp, json_pack("s", "interval"));
if (set->flags & NFT_SET_TIMEOUT)
json_array_append_new(tmp, json_pack("s", "timeout"));
if (json_array_size(tmp) > 0) {
json_object_set_new(root, "flags", tmp);
} else {
if (json_array_size(tmp))
json_object_set(root, "flags", json_array_get(tmp, 0));
json_decref(tmp);
}
if (set->timeout) {
tmp = json_integer(set->timeout / 1000);
json_object_set_new(root, "timeout", tmp);
}
if (set->gc_int) {
tmp = json_pack("i", set->gc_int / 1000);
json_object_set_new(root, "gc-interval", tmp);
}
if (set->init && set->init->size > 0) {
json_t *array = json_array();
const struct expr *i;
list_for_each_entry(i, &set->init->expressions, list)
json_array_append_new(array, expr_print_json(i, octx));
json_object_set_new(root, "elem", array);
}
return json_pack("{s:o}", type, root);
}
/* XXX: Merge with set_print_json()? */
static json_t *element_print_json(struct output_ctx *octx,
const struct set *set)
{
json_t *root = expr_print_json(set->init, octx);
return json_pack("{s: {s:s, s:s, s:s, s:o}}", "element",
"family", family2str(set->handle.family),
"table", set->handle.table.name,
"name", set->handle.set.name,
"elem", root);
}
static json_t *stmt_print_json(const struct stmt *stmt, struct output_ctx *octx)
{
char buf[1024];
FILE *fp;
/* XXX: Can't be supported at this point:
* xt_stmt_xlate() ignores output_fp.
*/
if (stmt->ops->type == STMT_XT)
return json_pack("{s:n}", "xt");
if (stmt->ops->json)
return stmt->ops->json(stmt, octx);
printf("warning: stmt ops %s have no json callback\n",
stmt->ops->name);
fp = octx->output_fp;
octx->output_fp = fmemopen(buf, 1024, "w");
stmt->ops->print(stmt, octx);
fclose(octx->output_fp);
octx->output_fp = fp;
return json_pack("s", buf);
}
static json_t *rule_print_json(struct output_ctx *octx,
const struct rule *rule)
{
const struct stmt *stmt;
json_t *root, *tmp;
root = json_pack("{s:s, s:s, s:s, s:I}",
"family", family2str(rule->handle.family),
"table", rule->handle.table.name,
"chain", rule->handle.chain.name,
"handle", rule->handle.handle.id);
if (rule->comment)
json_object_set_new(root, "comment",
json_string(rule->comment));
tmp = json_array();
list_for_each_entry(stmt, &rule->stmts, list)
json_array_append_new(tmp, stmt_print_json(stmt, octx));
if (json_array_size(tmp))
json_object_set_new(root, "expr", tmp);
else {
fprintf(stderr, "rule without statements?!\n");
json_decref(tmp);
}
return json_pack("{s:o}", "rule", root);
}
static json_t *chain_print_json(const struct chain *chain)
{
int priority, policy, n = 0;
struct expr *dev, *expr;
json_t *root, *tmp;
root = json_pack("{s:s, s:s, s:s, s:I}",
"family", family2str(chain->handle.family),
"table", chain->handle.table.name,
"name", chain->handle.chain.name,
"handle", chain->handle.handle.id);
if (chain->flags & CHAIN_F_BASECHAIN) {
mpz_export_data(&priority, chain->priority.expr->value,
BYTEORDER_HOST_ENDIAN, sizeof(int));
mpz_export_data(&policy, chain->policy->value,
BYTEORDER_HOST_ENDIAN, sizeof(int));
tmp = json_pack("{s:s, s:s, s:i, s:s}",
"type", chain->type,
"hook", hooknum2str(chain->handle.family,
chain->hook.num),
"prio", priority,
"policy", chain_policy2str(policy));
if (chain->dev_expr) {
list_for_each_entry(expr, &chain->dev_expr->expressions, list) {
dev = expr;
n++;
}
}
if (n == 1) {
json_object_set_new(tmp, "dev",
json_string(dev->identifier));
}
json_object_update(root, tmp);
json_decref(tmp);
}
return json_pack("{s:o}", "chain", root);
}
static json_t *proto_name_json(uint8_t proto)
{
const struct protoent *p = getprotobynumber(proto);
if (p)
return json_string(p->p_name);
return json_integer(proto);
}
static json_t *timeout_policy_json(uint8_t l4, const uint32_t *timeout)
{
json_t *root = NULL;
unsigned int i;
for (i = 0; i < timeout_protocol[l4].array_size; i++) {
if (timeout[i] == timeout_protocol[l4].dflt_timeout[i])
continue;
if (!root)
root = json_object();
json_object_set_new(root, timeout_protocol[l4].state_to_name[i],
json_integer(timeout[i]));
}
return root ? : json_null();
}
static json_t *obj_print_json(const struct obj *obj)
{
const char *rate_unit = NULL, *burst_unit = NULL;
const char *type = obj_type_name(obj->type);
json_t *root, *tmp, *flags;
uint64_t rate, burst;
root = json_pack("{s:s, s:s, s:s, s:I}",
"family", family2str(obj->handle.family),
"name", obj->handle.obj.name,
"table", obj->handle.table.name,
"handle", obj->handle.handle.id);
switch (obj->type) {
case NFT_OBJECT_COUNTER:
tmp = json_pack("{s:I, s:I}",
"packets", obj->counter.packets,
"bytes", obj->counter.bytes);
json_object_update(root, tmp);
json_decref(tmp);
break;
case NFT_OBJECT_QUOTA:
tmp = json_pack("{s:I, s:I, s:b}",
"bytes", obj->quota.bytes,
"used", obj->quota.used,
"inv", obj->quota.flags & NFT_QUOTA_F_INV);
json_object_update(root, tmp);
json_decref(tmp);
break;
case NFT_OBJECT_SECMARK:
tmp = json_pack("{s:s}",
"context", obj->secmark.ctx);
json_object_update(root, tmp);
json_decref(tmp);
break;
case NFT_OBJECT_CT_HELPER:
tmp = json_pack("{s:s, s:o, s:s}",
"type", obj->ct_helper.name, "protocol",
proto_name_json(obj->ct_helper.l4proto),
"l3proto", family2str(obj->ct_helper.l3proto));
json_object_update(root, tmp);
json_decref(tmp);
break;
case NFT_OBJECT_CT_TIMEOUT:
tmp = timeout_policy_json(obj->ct_timeout.l4proto,
obj->ct_timeout.timeout);
tmp = json_pack("{s:o, s:s, s:o}",
"protocol",
proto_name_json(obj->ct_timeout.l4proto),
"l3proto", family2str(obj->ct_timeout.l3proto),
"policy", tmp);
json_object_update(root, tmp);
json_decref(tmp);
break;
case NFT_OBJECT_CT_EXPECT:
tmp = json_pack("{s:o, s:I, s:I, s:I, s:s}",
"protocol",
proto_name_json(obj->ct_expect.l4proto),
"dport", obj->ct_expect.dport,
"timeout", obj->ct_expect.timeout,
"size", obj->ct_expect.size,
"l3proto", family2str(obj->ct_expect.l3proto));
json_object_update(root, tmp);
json_decref(tmp);
break;
case NFT_OBJECT_LIMIT:
rate = obj->limit.rate;
burst = obj->limit.burst;
if (obj->limit.type == NFT_LIMIT_PKT_BYTES) {
rate_unit = get_rate(obj->limit.rate, &rate);
burst_unit = get_rate(obj->limit.burst, &burst);
}
tmp = json_pack("{s:I, s:s}",
"rate", rate,
"per", get_unit(obj->limit.unit));
if (obj->limit.flags & NFT_LIMIT_F_INV)
json_object_set_new(tmp, "inv", json_true());
if (rate_unit)
json_object_set_new(tmp, "rate_unit",
json_string(rate_unit));
if (burst) {
json_object_set_new(tmp, "burst", json_integer(burst));
if (burst_unit)
json_object_set_new(tmp, "burst_unit",
json_string(burst_unit));
}
json_object_update(root, tmp);
json_decref(tmp);
break;
case NFT_OBJECT_SYNPROXY:
flags = json_array();
tmp = json_pack("{s:i, s:i}",
"mss", obj->synproxy.mss,
"wscale", obj->synproxy.wscale);
if (obj->synproxy.flags & NF_SYNPROXY_OPT_TIMESTAMP)
json_array_append_new(flags, json_string("timestamp"));
if (obj->synproxy.flags & NF_SYNPROXY_OPT_SACK_PERM)
json_array_append_new(flags, json_string("sack-perm"));
if (json_array_size(flags) > 0)
json_object_set_new(tmp, "flags", flags);
else
json_decref(flags);
json_object_update(root, tmp);
json_decref(tmp);
break;
}
return json_pack("{s:o}", type, root);
}
static json_t *flowtable_print_json(const struct flowtable *ftable)
{
json_t *root, *devs = NULL;
int i, priority;
mpz_export_data(&priority, ftable->priority.expr->value,
BYTEORDER_HOST_ENDIAN, sizeof(int));
root = json_pack("{s:s, s:s, s:s, s:I, s:s, s:i}",
"family", family2str(ftable->handle.family),
"name", ftable->handle.flowtable.name,
"table", ftable->handle.table.name,
"handle", ftable->handle.handle.id,
"hook", hooknum2str(NFPROTO_NETDEV, ftable->hook.num),
"prio", priority);
for (i = 0; i < ftable->dev_array_len; i++) {
const char *dev = ftable->dev_array[i];
if (!devs)
devs = json_string(dev);
else if (json_is_string(devs))
devs = json_pack("[o, s]", devs, dev);
else
json_array_append_new(devs, json_string(dev));
}
if (devs)
json_object_set_new(root, "dev", devs);
return json_pack("{s:o}", "flowtable", root);
}
static json_t *table_flags_json(const struct table *table)
{
uint32_t flags = table->flags;
json_t *root = json_array(), *tmp;
int i = 0;
while (flags) {
if (flags & 0x1) {
tmp = json_string(table_flags_name[i]);
json_array_append_new(root, tmp);
}
flags >>= 1;
i++;
}
switch (json_array_size(root)) {
case 0:
json_decref(root);
return NULL;
case 1:
json_unpack(root, "[o]", &tmp);
json_decref(root);
root = tmp;
break;
}
return root;
}
static json_t *table_print_json(const struct table *table)
{
json_t *root, *tmp;
root = json_pack("{s:s, s:s, s:I}",
"family", family2str(table->handle.family),
"name", table->handle.table.name,
"handle", table->handle.handle.id);
tmp = table_flags_json(table);
if (tmp)
json_object_set_new(root, "flags", tmp);
return json_pack("{s:o}", "table", root);
}
json_t *binop_expr_json(const struct expr *expr, struct output_ctx *octx)
{
return json_pack("{s:[o, o]}", expr_op_symbols[expr->op],
expr_print_json(expr->left, octx),
expr_print_json(expr->right, octx));
}
json_t *relational_expr_json(const struct expr *expr, struct output_ctx *octx)
{
return json_pack("{s:{s:s, s:o, s:o}}", "match",
"op", expr_op_symbols[expr->op] ? : "in",
"left", expr_print_json(expr->left, octx),
"right", expr_print_json(expr->right, octx));
}
json_t *range_expr_json(const struct expr *expr, struct output_ctx *octx)
{
unsigned int flags = octx->flags;
json_t *root;
octx->flags &= ~NFT_CTX_OUTPUT_SERVICE;
octx->flags |= NFT_CTX_OUTPUT_NUMERIC_PROTO;
root = json_pack("{s:[o, o]}", "range",
expr_print_json(expr->left, octx),
expr_print_json(expr->right, octx));
octx->flags = flags;
return root;
}
json_t *meta_expr_json(const struct expr *expr, struct output_ctx *octx)
{
return json_pack("{s:{s:s}}", "meta",
"key", meta_templates[expr->meta.key].token);
}
json_t *payload_expr_json(const struct expr *expr, struct output_ctx *octx)
{
json_t *root;
if (payload_is_known(expr))
root = json_pack("{s:s, s:s}",
"protocol", expr->payload.desc->name,
"field", expr->payload.tmpl->token);
else
root = json_pack("{s:s, s:i, s:i}",
"base", proto_base_tokens[expr->payload.base],
"offset", expr->payload.offset,
"len", expr->len);
return json_pack("{s:o}", "payload", root);
}
json_t *ct_expr_json(const struct expr *expr, struct output_ctx *octx)
{
const char *dirstr = ct_dir2str(expr->ct.direction);
enum nft_ct_keys key = expr->ct.key;
json_t *root;
root = json_pack("{s:s}", "key", ct_templates[key].token);
if (expr->ct.direction < 0)
goto out;
if (dirstr)
json_object_set_new(root, "dir", json_string(dirstr));
out:
return json_pack("{s:o}", "ct", root);
}
json_t *concat_expr_json(const struct expr *expr, struct output_ctx *octx)
{
json_t *array = json_array();
const struct expr *i;
list_for_each_entry(i, &expr->expressions, list)
json_array_append_new(array, expr_print_json(i, octx));
return json_pack("{s:o}", "concat", array);
}
json_t *set_expr_json(const struct expr *expr, struct output_ctx *octx)
{
json_t *array = json_array();
const struct expr *i;
list_for_each_entry(i, &expr->expressions, list)
json_array_append_new(array, expr_print_json(i, octx));
return json_pack("{s:o}", "set", array);
}
json_t *set_ref_expr_json(const struct expr *expr, struct output_ctx *octx)
{
if (set_is_anonymous(expr->set->flags)) {
return expr_print_json(expr->set->init, octx);
} else {
return json_pack("s+", "@", expr->set->handle.set.name);
}
}
json_t *set_elem_expr_json(const struct expr *expr, struct output_ctx *octx)
{
json_t *root = expr_print_json(expr->key, octx);
json_t *tmp;
if (!root)
return NULL;
/* these element attributes require formal set elem syntax */
if (expr->timeout || expr->expiration || expr->comment) {
root = json_pack("{s:o}", "val", root);
if (expr->timeout) {
tmp = json_integer(expr->timeout / 1000);
json_object_set_new(root, "timeout", tmp);
}
if (expr->expiration) {
tmp = json_integer(expr->expiration / 1000);
json_object_set_new(root, "expires", tmp);
}
if (expr->comment) {
tmp = json_string(expr->comment);
json_object_set_new(root, "comment", tmp);
}
return json_pack("{s:o}", "elem", root);
}
return root;
}
json_t *prefix_expr_json(const struct expr *expr, struct output_ctx *octx)
{
json_t *root = expr_print_json(expr->prefix, octx);
return json_pack("{s:{s:o, s:i}}", "prefix",
"addr", root,
"len", expr->prefix_len);
}
json_t *list_expr_json(const struct expr *expr, struct output_ctx *octx)
{
json_t *array = json_array();
const struct expr *i;
list_for_each_entry(i, &expr->expressions, list)
json_array_append_new(array, expr_print_json(i, octx));
//return json_pack("{s:s, s:o}", "type", "list", "val", array);
return array;
}
json_t *unary_expr_json(const struct expr *expr, struct output_ctx *octx)
{
return expr_print_json(expr->arg, octx);
}
json_t *mapping_expr_json(const struct expr *expr, struct output_ctx *octx)
{
return json_pack("[o, o]",
expr_print_json(expr->left, octx),
expr_print_json(expr->right, octx));
}
json_t *map_expr_json(const struct expr *expr, struct output_ctx *octx)
{
const char *type = "map";
if (expr->mappings->etype == EXPR_SET_REF &&
expr->mappings->set->data->dtype->type == TYPE_VERDICT)
type = "vmap";
return json_pack("{s:{s:o, s:o}}", type,
"key", expr_print_json(expr->map, octx),
"data", expr_print_json(expr->mappings, octx));
}
json_t *exthdr_expr_json(const struct expr *expr, struct output_ctx *octx)
{
const char *desc = expr->exthdr.desc ?
expr->exthdr.desc->name :
"unknown-exthdr";
const char *field = expr->exthdr.tmpl->token;
json_t *root;
bool is_exists = expr->exthdr.flags & NFT_EXTHDR_F_PRESENT;
if (expr->exthdr.op == NFT_EXTHDR_OP_TCPOPT) {
unsigned int offset = expr->exthdr.offset / 64;
if (offset) {
const char *offstrs[] = { "0", "1", "2", "3" };
const char *offstr = "";
if (offset < 4)
offstr = offstrs[offset];
root = json_pack("{s:s+}", "name", desc, offstr);
} else {
root = json_pack("{s:s}", "name", desc);
}
if (!is_exists)
json_object_set_new(root, "field", json_string(field));
return json_pack("{s:o}", "tcp option", root);
}
if (expr->exthdr.op == NFT_EXTHDR_OP_IPV4) {
root = json_pack("{s:s}", "name", desc);
if (!is_exists)
json_object_set_new(root, "field", json_string(field));
return json_pack("{s:o}", "ip option", root);
}
root = json_pack("{s:s}",
"name", desc);
if (!is_exists)
json_object_set_new(root, "field", json_string(field));
return json_pack("{s:o}", "exthdr", root);
}
json_t *verdict_expr_json(const struct expr *expr, struct output_ctx *octx)
{
const struct {
int verdict;
const char *name;
bool chain;
} verdict_tbl[] = {
{ NFT_CONTINUE, "continue", false },
{ NFT_BREAK, "break", false },
{ NFT_JUMP, "jump", true },
{ NFT_GOTO, "goto", true },
{ NFT_RETURN, "return", false },
{ NF_ACCEPT, "accept", false },
{ NF_DROP, "drop", false },
{ NF_QUEUE, "queue", false },
};
const char *name = NULL;
json_t *chain = NULL;
unsigned int i;
for (i = 0; i < array_size(verdict_tbl); i++) {
if (expr->verdict == verdict_tbl[i].verdict) {
name = verdict_tbl[i].name;
if (verdict_tbl[i].chain && expr->chain)
chain = expr_print_json(expr->chain, octx);
break;
}
}
if (!name) {
BUG("Unknown verdict %d.", expr->verdict);
return NULL;
}
if (chain)
return json_pack("{s:{s:o}}", name, "target", chain);
else
return json_pack("{s:n}", name);
}
json_t *rt_expr_json(const struct expr *expr, struct output_ctx *octx)
{
const char *key = rt_templates[expr->rt.key].token;
json_t *root = json_pack("{s:s}", "key", key);
const char *family = NULL;
switch (expr->rt.key) {
case NFT_RT_NEXTHOP4:
family = "ip";
break;
case NFT_RT_NEXTHOP6:
family = "ip6";
break;
default:
break;
}
if (family)
json_object_set_new(root, "family", json_string(family));
return json_pack("{s:o}", "rt", root);
}
json_t *numgen_expr_json(const struct expr *expr, struct output_ctx *octx)
{
const char *mode;
switch (expr->numgen.type) {
case NFT_NG_INCREMENTAL:
mode = "inc";
break;
case NFT_NG_RANDOM:
mode = "random";
break;
default:
mode = "unknown";
break;
}
return json_pack("{s:{s:s, s:i, s:i}}", "numgen",
"mode", mode,
"mod", expr->numgen.mod,
"offset", expr->numgen.offset);
}
json_t *hash_expr_json(const struct expr *expr, struct output_ctx *octx)
{
const char *type;
json_t *root, *jexpr = NULL;
switch (expr->hash.type) {
case NFT_HASH_SYM:
type = "symhash";
break;
case NFT_HASH_JENKINS:
default:
type = "jhash";
jexpr = expr_print_json(expr->hash.expr, octx);
break;
}
root = json_pack("{s:i}", "mod", expr->hash.mod);
if (expr->hash.seed_set)
json_object_set_new(root, "seed",
json_integer(expr->hash.seed));
if (expr->hash.offset)
json_object_set_new(root, "offset",
json_integer(expr->hash.offset));
if (jexpr)
json_object_set_new(root, "expr", jexpr);
return json_pack("{s:o}", type, root);
}
json_t *fib_expr_json(const struct expr *expr, struct output_ctx *octx)
{
const char *fib_flags[] = { "saddr", "daddr", "mark", "iif", "oif" };
unsigned int flags = expr->fib.flags & ~NFTA_FIB_F_PRESENT;
json_t *root;
root = json_pack("{s:s}", "result", fib_result_str(expr->fib.result));
if (flags) {
json_t *tmp = json_array();
unsigned int i;
for (i = 0; i < array_size(fib_flags); i++) {
if (flags & (1 << i)) {
json_array_append_new(tmp, json_string(fib_flags[i]));
flags &= ~(1 << i);
}
}
if (flags)
json_array_append_new(tmp, json_integer(flags));
json_object_set_new(root, "flags", tmp);
}
return json_pack("{s:o}", "fib", root);
}
static json_t *symbolic_constant_json(const struct symbol_table *tbl,
const struct expr *expr,
struct output_ctx *octx)
{
unsigned int len = div_round_up(expr->len, BITS_PER_BYTE);
const struct symbolic_constant *s;
uint64_t val = 0;
/* Export the data in the correct byteorder for comparison */
assert(expr->len / BITS_PER_BYTE <= sizeof(val));
mpz_export_data(constant_data_ptr(val, expr->len), expr->value,
expr->byteorder, len);
for (s = tbl->symbols; s->identifier != NULL; s++) {
if (val == s->value)
break;
}
if (!s->identifier)
return expr_basetype(expr)->json(expr, octx);
if (nft_output_numeric_symbol(octx))
return json_integer(val);
else
return json_string(s->identifier);
}
static json_t *datatype_json(const struct expr *expr, struct output_ctx *octx)
{
const struct datatype *dtype = expr->dtype;
do {
if (dtype->json)
return dtype->json(expr, octx);
if (dtype->sym_tbl)
return symbolic_constant_json(dtype->sym_tbl,
expr, octx);
if (dtype->print) {
char buf[1024];
FILE *ofp = octx->output_fp;
octx->output_fp = fmemopen(buf, 1024, "w");
dtype->print(expr, octx);
fclose(octx->output_fp);
octx->output_fp = ofp;
if (buf[0] == '"') {
memmove(buf, buf + 1, strlen(buf));
*strchrnul(buf, '"') = '\0';
}
return json_string(buf);
}
} while ((dtype = dtype->basetype));
BUG("datatype %s has no print method or symbol table\n",
expr->dtype->name);
}
json_t *constant_expr_json(const struct expr *expr, struct output_ctx *octx)
{
return datatype_json(expr, octx);
}
json_t *socket_expr_json(const struct expr *expr, struct output_ctx *octx)
{
return json_pack("{s:{s:s}}", "socket", "key",
socket_templates[expr->socket.key].token);
}
json_t *osf_expr_json(const struct expr *expr, struct output_ctx *octx)
{
json_t *root;
if (expr->osf.flags & NFT_OSF_F_VERSION)
root = json_pack("{s:s}", "key", "version");
else
root = json_pack("{s:s}", "key", "name");
switch (expr->osf.ttl) {
case 1:
json_object_set_new(root, "ttl", json_string("loose"));
break;
case 2:
json_object_set_new(root, "ttl", json_string("skip"));
break;
}
return json_pack("{s:o}", "osf", root);
}
json_t *xfrm_expr_json(const struct expr *expr, struct output_ctx *octx)
{
const char *name = xfrm_templates[expr->xfrm.key].token;
const char *family = NULL;
const char *dirstr;
json_t *root;
switch (expr->xfrm.direction) {
case XFRM_POLICY_IN:
dirstr = "in";
break;
case XFRM_POLICY_OUT:
dirstr = "out";
break;
default:
return NULL;
}
switch (expr->xfrm.key) {
case NFT_XFRM_KEY_UNSPEC:
case NFT_XFRM_KEY_SPI:
case NFT_XFRM_KEY_REQID:
case __NFT_XFRM_KEY_MAX:
break;
case NFT_XFRM_KEY_DADDR_IP4:
case NFT_XFRM_KEY_SADDR_IP4:
family = "ip";
break;
case NFT_XFRM_KEY_DADDR_IP6:
case NFT_XFRM_KEY_SADDR_IP6:
family = "ip6";
break;
}
root = json_pack("{s:s}", "key", name);
if (family)
json_object_set_new(root, "family", json_string(family));
json_object_set_new(root, "dir", json_string(dirstr));
json_object_set_new(root, "spnum", json_integer(expr->xfrm.spnum));
return json_pack("{s:o}", "ipsec", root);
}
json_t *integer_type_json(const struct expr *expr, struct output_ctx *octx)
{
char buf[1024] = "0x";
if (mpz_fits_ulong_p(expr->value))
return json_integer(mpz_get_ui(expr->value));
mpz_get_str(buf + 2, 16, expr->value);
return json_string(buf);
}
json_t *string_type_json(const struct expr *expr, struct output_ctx *octx)
{
unsigned int len = div_round_up(expr->len, BITS_PER_BYTE);
char data[len+1];
mpz_export_data(data, expr->value, BYTEORDER_HOST_ENDIAN, len);
data[len] = '\0';
return json_string(data);
}
json_t *boolean_type_json(const struct expr *expr, struct output_ctx *octx)
{