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/*
* (C) 2012-2014 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdarg.h>
#include <inttypes.h>
#include <string.h>
#include <buffer.h>
#include <libnftnl/common.h>
#include <libnftnl/expr.h>
#include "internal.h"
int nftnl_buf_update(struct nftnl_buf *b, int ret)
{
if (ret < 0) {
b->fail = true;
} else {
b->off += ret;
if (ret > b->len)
ret = b->len;
b->size += ret;
b->len -= ret;
}
return ret;
}
int nftnl_buf_done(struct nftnl_buf *b)
{
if (b->fail)
return -1;
/* Remove trailing comma in json */
if (b->size > 0 && b->buf[b->size - 1] == ',') {
b->off--;
b->size--;
b->len++;
}
return b->off;
}
static int nftnl_buf_put(struct nftnl_buf *b, const char *fmt, ...)
{
int ret;
va_list ap;
va_start(ap, fmt);
ret = vsnprintf(b->buf + b->off, b->len, fmt, ap);
ret = nftnl_buf_update(b, ret);
va_end(ap);
return ret;
}
int nftnl_buf_open(struct nftnl_buf *b, int type, const char *tag)
{
switch (type) {
case NFTNL_OUTPUT_JSON:
return nftnl_buf_put(b, "{\"%s\":{", tag);
case NFTNL_OUTPUT_XML:
default:
return 0;
}
}
int nftnl_buf_close(struct nftnl_buf *b, int type, const char *tag)
{
switch (type) {
case NFTNL_OUTPUT_JSON:
/* Remove trailing comma in json */
if (b->size > 0 && b->buf[b->size - 1] == ',') {
b->off--;
b->size--;
b->len++;
}
return nftnl_buf_put(b, "}}");
case NFTNL_OUTPUT_XML:
default:
return 0;
}
}
int nftnl_buf_open_array(struct nftnl_buf *b, int type, const char *tag)
{
switch (type) {
case NFTNL_OUTPUT_JSON:
return nftnl_buf_put(b, "{\"%s\":[", tag);
case NFTNL_OUTPUT_XML:
default:
return 0;
}
}
int nftnl_buf_close_array(struct nftnl_buf *b, int type, const char *tag)
{
switch (type) {
case NFTNL_OUTPUT_JSON:
return nftnl_buf_put(b, "]}");
case NFTNL_OUTPUT_XML:
default:
return 0;
}
}
int nftnl_buf_u32(struct nftnl_buf *b, int type, uint32_t value, const char *tag)
{
switch (type) {
case NFTNL_OUTPUT_JSON:
return nftnl_buf_put(b, "\"%s\":%u,", tag, value);
case NFTNL_OUTPUT_XML:
default:
return 0;
}
}
int nftnl_buf_s32(struct nftnl_buf *b, int type, uint32_t value, const char *tag)
{
switch (type) {
case NFTNL_OUTPUT_JSON:
return nftnl_buf_put(b, "\"%s\":%d,", tag, value);
case NFTNL_OUTPUT_XML:
default:
return 0;
}
}
int nftnl_buf_u64(struct nftnl_buf *b, int type, uint64_t value, const char *tag)
{
switch (type) {
case NFTNL_OUTPUT_JSON:
return nftnl_buf_put(b, "\"%s\":%"PRIu64",", tag, value);
case NFTNL_OUTPUT_XML:
default:
return 0;
}
}
int nftnl_buf_str(struct nftnl_buf *b, int type, const char *str, const char *tag)
{
switch (type) {
case NFTNL_OUTPUT_JSON:
return nftnl_buf_put(b, "\"%s\":\"%s\",", tag, str);
case NFTNL_OUTPUT_XML:
default:
return 0;
}
}
int nftnl_buf_reg(struct nftnl_buf *b, int type, union nftnl_data_reg *reg,
int reg_type, const char *tag)
{
int ret;
switch (type) {
case NFTNL_OUTPUT_XML:
return 0;
case NFTNL_OUTPUT_JSON:
nftnl_buf_put(b, "\"%s\":{", tag);
ret = nftnl_data_reg_snprintf(b->buf + b->off, b->len, reg,
NFTNL_OUTPUT_JSON, 0, reg_type);
nftnl_buf_update(b, ret);
return nftnl_buf_put(b, "},");
}
return 0;
}
int nftnl_buf_expr_open(struct nftnl_buf *b, int type)
{
switch (type) {
case NFTNL_OUTPUT_XML:
return 0;
case NFTNL_OUTPUT_JSON:
return nftnl_buf_put(b, "\"expr\":[");
}
return 0;
}
int nftnl_buf_expr_close(struct nftnl_buf *b, int type)
{
switch (type) {
case NFTNL_OUTPUT_XML:
return 0;
case NFTNL_OUTPUT_JSON:
nftnl_buf_done(b);
return nftnl_buf_put(b, "]");
}
return 0;
}
int nftnl_buf_expr(struct nftnl_buf *b, int type, uint32_t flags,
struct nftnl_expr *expr)
{
int ret;
switch (type) {
case NFTNL_OUTPUT_XML:
return 0;
case NFTNL_OUTPUT_JSON:
nftnl_buf_put(b, "{");
nftnl_buf_str(b, type, expr->ops->name, TYPE);
ret = nftnl_expr_snprintf(b->buf + b->off, b->len, expr, type,
flags);
if (ret > 0)
nftnl_buf_update(b, ret);
else
nftnl_buf_done(b);
return nftnl_buf_put(b, "},");
}
return 0;
}
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