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/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
/* Copyright (c) The Exim Maintainers 2021 - 2022 */
/* Copyright (c) Jeremy Harris 2019 - 2020 */
/* See the file NOTICE for conditions of use and distribution. */
#include "../exim.h"
#include "lf_functions.h"
#include <jansson.h>
/* All use of allocations will be done against the POOL_SEARCH memory,
which is freed once by search_tidyup(). Make the free call a dummy.
This burns some 300kB in handling a 37kB JSON file, for the benefit of
a fast free. The alternative of staying with malloc is nearly as bad,
eyeballing the activity there are 20% the number of free vs. alloc
calls (before the big bunch at the end).
Assume that the file is trusted, so no tainting */
static void *
json_malloc(size_t nbytes)
{
void * p = store_get((int)nbytes, GET_UNTAINTED);
/* debug_printf("%s %d: %p\n", __FUNCTION__, (int)nbytes, p); */
return p;
}
static void
json_free(void * p)
{
/* debug_printf("%s: %p\n", __FUNCTION__, p); */
}
/*************************************************
* Open entry point *
*************************************************/
/* See local README for interface description */
static void *
json_open(const uschar * filename, uschar ** errmsg)
{
FILE * f;
json_set_alloc_funcs(json_malloc, json_free);
if (!(f = Ufopen(filename, "rb")))
*errmsg = string_open_failed("%s for json search", filename);
return f;
}
/*************************************************
* Check entry point *
*************************************************/
static BOOL
json_check(void *handle, const uschar *filename, int modemask, uid_t *owners,
gid_t *owngroups, uschar **errmsg)
{
return lf_check_file(fileno((FILE *)handle), filename, S_IFREG, modemask,
owners, owngroups, "json", errmsg) == 0;
}
/*************************************************
* Find entry point for lsearch *
*************************************************/
/* See local README for interface description */
static int
json_find(void * handle, const uschar * filename, const uschar * keystring,
int length, uschar ** result, uschar ** errmsg, uint * do_cache,
const uschar * opts)
{
FILE * f = handle;
json_t * j, * j0;
json_error_t jerr;
uschar * key;
int sep = 0;
rewind(f);
if (!(j = json_loadf(f, 0, &jerr)))
{
*errmsg = string_sprintf("json error on open: %.*s\n",
JSON_ERROR_TEXT_LENGTH, jerr.text);
return FAIL;
}
j0 = j;
for (int k = 1; (key = string_nextinlist(&keystring, &sep, NULL, 0)); k++)
{
BOOL numeric = TRUE;
for (uschar * s = key; *s; s++) if (!isdigit(*s)) { numeric = FALSE; break; }
if (!(j = numeric
? json_array_get(j, (size_t) strtoul(CS key, NULL, 10))
: json_object_get(j, CCS key)
) )
{
DEBUG(D_lookup) debug_printf_indent("%s, for key %d: '%s'\n",
numeric
? US"bad index, or not json array"
: US"no such key, or not json object",
k, key);
json_decref(j0);
return FAIL;
}
}
switch (json_typeof(j))
{
case JSON_STRING:
*result = string_copyn(CUS json_string_value(j), json_string_length(j));
break;
case JSON_INTEGER:
*result = string_sprintf("%" JSON_INTEGER_FORMAT, json_integer_value(j));
break;
case JSON_REAL:
*result = string_sprintf("%f", json_real_value(j));
break;
case JSON_TRUE: *result = US"true"; break;
case JSON_FALSE: *result = US"false"; break;
case JSON_NULL: *result = NULL; break;
default: *result = US json_dumps(j, 0); break;
}
json_decref(j0);
return OK;
}
/*************************************************
* Close entry point *
*************************************************/
/* See local README for interface description */
static void
json_close(void *handle)
{
(void)fclose((FILE *)handle);
}
/*************************************************
* Version reporting entry point *
*************************************************/
/* See local README for interface description. */
#include "../version.h"
gstring *
json_version_report(gstring * g)
{
return string_fmt_append(g, "Library version: json: Jansonn version %s\n", JANSSON_VERSION);
}
static lookup_info json_lookup_info = {
.name = US"json", /* lookup name */
.type = lookup_absfile, /* uses absolute file name */
.open = json_open, /* open function */
.check = json_check, /* check function */
.find = json_find, /* find function */
.close = json_close, /* close function */
.tidy = NULL, /* no tidy function */
.quote = NULL, /* no quoting function */
.version_report = json_version_report /* version reporting */
};
#ifdef DYNLOOKUP
#define json_lookup_module_info _lookup_module_info
#endif
static lookup_info *_lookup_list[] = { &json_lookup_info };
lookup_module_info json_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
/* End of lookups/json.c */
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