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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2013-2020 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include "compat/stdbool.h"
#endif /* HAVE_STDBOOL_H */
#include <string.h>
#include "sudo_compat.h"
#include "sudo_debug.h"
#include "sudo_fatal.h"
#include "sudo_gettext.h"
#include "sudo_json.h"
#include "sudo_util.h"
/*
* Double the size of the json buffer.
* Returns true on success, false if out of memory.
*/
static bool
json_expand_buf(struct json_container *json)
{
char *newbuf;
debug_decl(json_expand_buf, SUDO_DEBUG_UTIL);
if ((newbuf = reallocarray(json->buf, 2, json->bufsize)) == NULL) {
if (json->memfatal) {
sudo_fatalx(U_("%s: %s"),
__func__, U_("unable to allocate memory"));
}
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
"%s: %s", __func__, "unable to allocate memory");
debug_return_bool(false);
}
json->buf = newbuf;
json->bufsize *= 2;
debug_return_bool(true);
}
/*
* Start a new line and indent unless formatting as minimal JSON.
* Append "indent" number of blank characters.
*/
static bool
json_new_line(struct json_container *json)
{
int indent = json->indent_level;
debug_decl(json_new_line, SUDO_DEBUG_UTIL);
/* No non-essential white space in minimal mode. */
if (json->minimal)
debug_return_bool(true);
while (json->buflen + 1 + indent >= json->bufsize) {
if (!json_expand_buf(json))
debug_return_bool(false);
}
json->buf[json->buflen++] = '\n';
while (indent--) {
json->buf[json->buflen++] = ' ';
}
json->buf[json->buflen] = '\0';
debug_return_bool(true);
}
/*
* Append a string to the JSON buffer, expanding as needed.
* Does not perform any quoting.
*/
static bool
json_append_buf(struct json_container *json, const char *str)
{
size_t len;
debug_decl(json_append_buf, SUDO_DEBUG_UTIL);
len = strlen(str);
while (json->buflen + len >= json->bufsize) {
if (!json_expand_buf(json))
debug_return_bool(false);
}
memcpy(json->buf + json->buflen, str, len);
json->buflen += len;
json->buf[json->buflen] = '\0';
debug_return_bool(true);
}
/*
* Append a quoted JSON string, escaping special chars and expanding as needed.
* Does not support unicode escapes.
*/
static bool
json_append_string(struct json_container *json, const char *str)
{
char ch;
debug_decl(json_append_string, SUDO_DEBUG_UTIL);
if (!json_append_buf(json, "\""))
debug_return_bool(false);
while ((ch = *str++) != '\0') {
char buf[3], *cp = buf;
switch (ch) {
case '"':
case '\\':
*cp++ = '\\';
break;
case '\b':
*cp++ = '\\';
ch = 'b';
break;
case '\f':
*cp++ = '\\';
ch = 'f';
break;
case '\n':
*cp++ = '\\';
ch = 'n';
break;
case '\r':
*cp++ = '\\';
ch = 'r';
break;
case '\t':
*cp++ = '\\';
ch = 't';
break;
}
*cp++ = ch;
*cp++ = '\0';
if (!json_append_buf(json, buf))
debug_return_bool(false);
}
if (!json_append_buf(json, "\""))
debug_return_bool(false);
debug_return_bool(true);
}
bool
sudo_json_init_v1(struct json_container *json, int indent, bool minimal,
bool memfatal)
{
debug_decl(sudo_json_init, SUDO_DEBUG_UTIL);
memset(json, 0, sizeof(*json));
json->indent_level = indent;
json->indent_increment = indent;
json->minimal = minimal;
json->memfatal = memfatal;
json->buf = malloc(64 * 1024);
if (json->buf == NULL) {
if (json->memfatal) {
sudo_fatalx(U_("%s: %s"),
__func__, U_("unable to allocate memory"));
}
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
"%s: %s", __func__, "unable to allocate memory");
debug_return_bool(false);
}
*json->buf = '\0';
json->bufsize = 64 * 1024;
debug_return_bool(true);
}
void
sudo_json_free_v1(struct json_container *json)
{
debug_decl(sudo_json_free, SUDO_DEBUG_UTIL);
free(json->buf);
memset(json, 0, sizeof(*json));
debug_return;
}
bool
sudo_json_open_object_v1(struct json_container *json, const char *name)
{
debug_decl(sudo_json_open_object, SUDO_DEBUG_UTIL);
/* Add comma if we are continuing an object/array. */
if (json->need_comma) {
if (!json_append_buf(json, ","))
debug_return_bool(false);
}
if (!json_new_line(json))
debug_return_bool(false);
if (name != NULL) {
json_append_string(json, name);
if (!json_append_buf(json, json->minimal ? ":{" : ": {"))
debug_return_bool(false);
} else {
if (!json_append_buf(json, "{"))
debug_return_bool(false);
}
json->indent_level += json->indent_increment;
json->need_comma = false;
debug_return_bool(true);
}
bool
sudo_json_close_object_v1(struct json_container *json)
{
debug_decl(sudo_json_close_object, SUDO_DEBUG_UTIL);
if (!json->minimal) {
json->indent_level -= json->indent_increment;
if (!json_new_line(json))
debug_return_bool(false);
}
if (!json_append_buf(json, "}"))
debug_return_bool(false);
debug_return_bool(true);
}
bool
sudo_json_open_array_v1(struct json_container *json, const char *name)
{
debug_decl(sudo_json_open_array, SUDO_DEBUG_UTIL);
/* Add comma if we are continuing an object/array. */
if (json->need_comma) {
if (!json_append_buf(json, ","))
debug_return_bool(false);
}
if (!json_new_line(json))
debug_return_bool(false);
if (name != NULL) {
json_append_string(json, name);
if (!json_append_buf(json, json->minimal ? ":[" : ": ["))
debug_return_bool(false);
} else {
if (!json_append_buf(json, "["))
debug_return_bool(false);
}
json->indent_level += json->indent_increment;
json->need_comma = false;
debug_return_bool(true);
}
bool
sudo_json_close_array_v1(struct json_container *json)
{
debug_decl(sudo_json_close_array, SUDO_DEBUG_UTIL);
if (!json->minimal) {
json->indent_level -= json->indent_increment;
if (!json_new_line(json))
debug_return_bool(false);
}
if (!json_append_buf(json, "]"))
debug_return_bool(false);
debug_return_bool(true);
}
static bool
sudo_json_add_value_int(struct json_container *json, const char *name,
struct json_value *value, bool as_object)
{
char numbuf[(((sizeof(long long) * 8) + 2) / 3) + 2];
debug_decl(sudo_json_add_value, SUDO_DEBUG_UTIL);
/* Add comma if we are continuing an object/array. */
if (json->need_comma) {
if (!json_append_buf(json, ","))
debug_return_bool(false);
}
if (!json_new_line(json))
debug_return_bool(false);
json->need_comma = true;
if (as_object) {
if (!json_append_buf(json, json->minimal ? "{" : "{ "))
debug_return_bool(false);
}
/* name */
if (name != NULL) {
if (!json_append_string(json, name))
debug_return_bool(false);
if (!json_append_buf(json, json->minimal ? ":" : ": "))
debug_return_bool(false);
}
/* value */
switch (value->type) {
case JSON_STRING:
if (!json_append_string(json, value->u.string))
debug_return_bool(false);
break;
case JSON_ID:
snprintf(numbuf, sizeof(numbuf), "%u", (unsigned int)value->u.id);
if (!json_append_buf(json, numbuf))
debug_return_bool(false);
break;
case JSON_NUMBER:
snprintf(numbuf, sizeof(numbuf), "%lld", value->u.number);
if (!json_append_buf(json, numbuf))
debug_return_bool(false);
break;
case JSON_NULL:
if (!json_append_buf(json, "null"))
debug_return_bool(false);
break;
case JSON_BOOL:
if (!json_append_buf(json, value->u.boolean ? "true" : "false"))
debug_return_bool(false);
break;
case JSON_ARRAY:
sudo_fatalx("internal error: can't print JSON_ARRAY");
break;
case JSON_OBJECT:
sudo_fatalx("internal error: can't print JSON_OBJECT");
break;
}
if (as_object) {
if (!json_append_buf(json, json->minimal ? "}" : " }"))
debug_return_bool(false);
}
debug_return_bool(true);
}
bool
sudo_json_add_value_v1(struct json_container *json, const char *name,
struct json_value *value)
{
return sudo_json_add_value_int(json, name, value, false);
}
bool
sudo_json_add_value_as_object_v1(struct json_container *json, const char *name,
struct json_value *value)
{
return sudo_json_add_value_int(json, name, value, true);
}
char *
sudo_json_get_buf_v1(struct json_container *json)
{
return json->buf;
}
unsigned int
sudo_json_get_len_v1(struct json_container *json)
{
return json->buflen;
}
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