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/*
* Copyright (c) 2014-2020 by Farsight Security, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if WANT_PDNS_CIRCL
/* asprintf() does not appear on linux without this */
#define _GNU_SOURCE
#include <stdio.h>
#include "defs.h"
#include "pdns.h"
#include "pdns_circl.h"
#include "globals.h"
static char *circl_url(const char *, char *, qparam_ct, pdns_fence_ct, bool);
static void circl_auth(fetch_t);
static const char *circl_status(fetch_t);
static const char *circl_verb_ok(const char *, qparam_ct);
static const char *circl_ready(void);
static const char *circl_setval(const char *, const char *);
static void circl_destroy(void);
static char *circl_base_url = NULL;
static char *circl_authinfo = NULL;
static const struct pdns_system circl = {
"circl", "https://www.circl.lu/pdns/query", encap_cof,
circl_url, NULL, circl_auth, circl_status, circl_verb_ok,
circl_setval, circl_ready, circl_destroy
};
pdns_system_ct
pdns_circl(void) {
return &circl;
}
static const char *
circl_setval(const char *key, const char *value) {
if (strcmp(key, "apikey") == 0) {
DESTROY(circl_authinfo);
circl_authinfo = strdup(value);
} else if (strcmp(key, "server") == 0) {
DESTROY(circl_base_url);
circl_base_url = strdup(value);
} else {
return "circl_setval() unrecognized key";
}
return NULL;
}
static const char *
circl_ready(void) {
return NULL;
}
static void
circl_destroy(void) {
DESTROY(circl_base_url);
DESTROY(circl_authinfo);
}
/* circl_url -- create a URL corresponding to a command-path string.
*
* the batch file and command line syntax are in native DNSDB API format.
* this function has the opportunity to crack this into pieces, and re-form
* those pieces into the URL format needed by some other DNSDB-like system
* which might have the same JSON output format but a different REST syntax.
*
* CIRCL pDNS only "understands IP addresses, hostnames or domain names
* (please note that CIDR block queries are not supported)". exit with an
* error message if asked to do something the CIRCL server does not handle.
*
* 1. RRSet query: rrset/name/NAME[/TYPE[/BAILIWICK]]
* 2. Rdata (name) query: rdata/name/NAME[/TYPE]
* 3. Rdata (IP address) query: rdata/ip/ADDR[/PFXLEN]
*/
static char *
circl_url(const char *path, char *sep,
qparam_ct qp __attribute__((unused)),
pdns_fence_ct fp __attribute__((unused)),
bool meta_query __attribute__((unused)))
{
const char *val = NULL;
char *ret;
int x, pi;
/* NULL-terminate array of valid query paths for CIRCL */
const char *valid_paths[] =
{ "rrset/name/", "rdata/name/", "rdata/ip/", NULL };
if (circl_base_url == NULL)
circl_base_url = strdup(psys->base_url);
for (pi = 0; valid_paths[pi] != NULL; pi++)
if (strncasecmp(path, valid_paths[pi], strlen(valid_paths[pi]))
== 0)
{
val = path + strlen(valid_paths[pi]);
break;
}
if (val == NULL) {
my_logf("unsupported type of query for CIRCL pDNS: %s", path);
my_exit(1);
}
if (strchr(val, '/') != NULL) {
my_logf("qualifiers not supported by CIRCL pDNS: %s", val);
my_exit(1);
}
x = asprintf(&ret, "%s/%s", circl_base_url, val);
if (x < 0)
my_panic(true, "asprintf");
/* because we will NOT append query parameters,
* tell the caller to use ? for its query parameters.
*/
if (sep != NULL)
*sep = '?';
return ret;
}
static void
circl_auth(fetch_t fetch) {
if (fetch->easy != NULL) {
curl_easy_setopt(fetch->easy, CURLOPT_USERPWD,
circl_authinfo);
curl_easy_setopt(fetch->easy, CURLOPT_HTTPAUTH,
CURLAUTH_BASIC);
}
}
static const char *
circl_status(fetch_t fetch __attribute__((unused))) {
return status_error;
}
static const char *
circl_verb_ok(const char *verb_name, qparam_ct qpp __attribute__((unused))) {
/* Only "lookup" is valid */
if (strcasecmp(verb_name, "lookup") != 0)
return "the CIRCL system only understands 'lookup'";
return NULL;
}
#endif /*WANT_PDNS_CIRCL*/
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