getdns_extra.h

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/*
 * Copyright (c) 2013, NLNet Labs, Verisign, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the names of the copyright holders nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Verisign, Inc. BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _GETDNS_EXTRA_H_
#define _GETDNS_EXTRA_H_

#include <getdns/getdns.h>
#include <sys/time.h>
#include <stdio.h>
#include <time.h>

#ifdef __cplusplus
extern "C" {
#endif

#define GETDNS_RETURN_NO_UPSTREAM_AVAILABLE ((getdns_return_t) 398 )
#define GETDNS_RETURN_NO_UPSTREAM_AVAILABLE_TEXT "None of the configured upstreams could be used to send queries on the specified transports"
#define GETDNS_RETURN_NEED_MORE_SPACE ((getdns_return_t) 399 )
#define GETDNS_RETURN_NEED_MORE_SPACE_TEXT "The buffer was too small"

#define GETDNS_CONTEXT_CODE_TLS_AUTHENTICATION 618
#define GETDNS_CONTEXT_CODE_TLS_AUTHENTICATION_TEXT "Change related to getdns_context_set_tls_authentication"
#define GETDNS_CONTEXT_CODE_EDNS_CLIENT_SUBNET_PRIVATE 619
#define GETDNS_CONTEXT_CODE_EDNS_CLIENT_SUBNET_PRIVATE_TEXT "Change related to getdns_context_set_edns_client_subnet_private"
#define GETDNS_CONTEXT_CODE_TLS_QUERY_PADDING_BLOCKSIZE 620
#define GETDNS_CONTEXT_CODE_TLS_QUERY_PADDING_BLOCKSIZE_TEXT "Change related to getdns_context_set_tls_query_padding_blocksize"
#define GETDNS_CONTEXT_CODE_PUBKEY_PINSET 621
#define GETDNS_CONTEXT_CODE_PUBKEY_PINSET_TEXT "Change related to getdns_context_set_pubkey_pinset"
#define GETDNS_CONTEXT_CODE_ROUND_ROBIN_UPSTREAMS 622
#define GETDNS_CONTEXT_CODE_ROUND_ROBIN_UPSTREAMS_TEXT "Change related to getdns_context_set_round_robin_upstreams"
#define GETDNS_CONTEXT_CODE_TLS_BACKOFF_TIME 623
#define GETDNS_CONTEXT_CODE_TLS_BACKOFF_TIME_TEXT "Change related to getdns_context_set_tls_backoff_time"
#define GETDNS_CONTEXT_CODE_TLS_CONNECTION_RETRIES 624
#define GETDNS_CONTEXT_CODE_TLS_CONNECTION_RETRIES_TEXT "Change related to getdns_context_set_tls_connection_retries"

#define GETDNS_VERSION "1.1.0-rc1"
#define GETDNS_NUMERIC_VERSION 0x0100C100
#define GETDNS_API_VERSION "December 2015"
#define GETDNS_API_NUMERIC_VERSION 0x07df0c00

/* an alias for REQUIRED */
#define GETDNS_AUTHENTICATION_HOSTNAME GETDNS_AUTHENTICATION_REQUIRED

/* Authentication options used when doing TLS */
typedef enum getdns_tls_authentication_t {
    GETDNS_AUTHENTICATION_NONE = 1300,
    GETDNS_AUTHENTICATION_REQUIRED = 1301
} getdns_tls_authentication_t;

#define GETDNS_AUTHENTICATION_NONE_TEXT "See getdns_context_set_tls_authentication()"
#define GETDNS_AUTHENTICATION_REQUIRED_TEXT "See getdns_context_set_tls_authentication()"

#define GETDNS_APPEND_NAME_TO_SINGLE_LABEL_FIRST ((getdns_append_name_t) 554 )
#define GETDNS_APPEND_NAME_TO_SINGLE_LABEL_FIRST_TEXT "See getdns_context_set_append_name()"

#define GETDNS_TRANSPORT_TLS_ONLY_KEEP_CONNECTIONS_OPEN 544
#define GETDNS_TRANSPORT_TLS_ONLY_KEEP_CONNECTIONS_OPEN_TEXT "See getdns_context_set_dns_transport()"
#define GETDNS_TRANSPORT_TLS_FIRST_AND_FALL_BACK_TO_TCP_KEEP_CONNECTIONS_OPEN 545
#define GETDNS_TRANSPORT_TLS_FIRST_AND_FALL_BACK_TO_TCP_KEEP_CONNECTIONS_OPEN_TEXT "See getdns_context_set_dns_transport()"

typedef void (*getdns_eventloop_callback)(void *userarg);

/* context extension event data */
typedef struct getdns_eventloop_event {
    void *userarg;
    getdns_eventloop_callback read_cb;
    getdns_eventloop_callback write_cb;
    getdns_eventloop_callback timeout_cb;

    /* Pointer to the underlying event
     * that the eventloop extension will create and free.
     */
    void *ev;
} getdns_eventloop_event;

typedef struct getdns_eventloop_vmt getdns_eventloop_vmt;
typedef struct getdns_eventloop {
    getdns_eventloop_vmt *vmt;
} getdns_eventloop;

/* A prototype for a method having no arguments and not return value. */
typedef void (*getdns_eventloop_noargs)(getdns_eventloop *loop);

/* Call the extension to schedule an event
 *
 * The getdns_eventloop_event must be provided by the caller with the callbacks
 * and userarg therein already supplied (by the caller). This function will set
 * the ev pointer (in the getdns_eventloop_event) to refer to the underlying
 * (extension) event.
 */
typedef getdns_return_t (*getdns_eventloop_schedule)(getdns_eventloop *loop,
    int fd, uint64_t timeout, getdns_eventloop_event *ev);

/* Call the extension to clean a scheduled event */
typedef getdns_return_t (*getdns_eventloop_clear)
    (getdns_eventloop *loop, getdns_eventloop_event *ev);

typedef void (*getdns_eventloop_run_once)(getdns_eventloop *loop,int blocking);

 /* Virtual Method Table */
struct getdns_eventloop_vmt {
    getdns_eventloop_noargs     cleanup;
    getdns_eventloop_schedule   schedule;
    getdns_eventloop_clear      clear;
    getdns_eventloop_noargs     run;
    getdns_eventloop_run_once   run_once;
};

/* set an event loop extension on the context */
getdns_return_t
getdns_context_set_eventloop(getdns_context* context,
    getdns_eventloop *eventloop);

/* get the currently active (pluggable) eventloop from the context */
getdns_return_t
getdns_context_get_eventloop(getdns_context* context,
    getdns_eventloop **eventloop);

/* detach the eventloop from the context */
getdns_return_t
getdns_context_detach_eventloop(getdns_context *context);

/* Run the context's event loop until nothing more to do */
void
getdns_context_run(getdns_context *context);
getdns_return_t
getdns_context_set_update_callback(getdns_context *context, void *userarg,
    void (*value) (getdns_context *, getdns_context_code_t, void *));

/* Enable the return_dnssec_status extension on every request.
   value is either GETDNS_EXTENSION_TRUE or GETDNS_EXTENSION_FALSE
   returns GETDNS_RETURN_GOOD on success or GETDNS_RETURN_INVALID_PARAMETER
   if context or value is invalid */
getdns_return_t getdns_context_set_return_dnssec_status(
    getdns_context *context, int enabled);

/* tells underlying unbound to use background threads or fork */
getdns_return_t getdns_context_set_use_threads(getdns_context* context,
    int use_threads);

getdns_return_t
getdns_context_set_tls_authentication(
    getdns_context *context, getdns_tls_authentication_t value);

getdns_return_t
getdns_context_set_round_robin_upstreams(getdns_context *context, uint8_t value);

getdns_return_t
getdns_context_set_tls_backoff_time(getdns_context *context, uint16_t value);

getdns_return_t
getdns_context_set_tls_connection_retries(getdns_context *context, uint16_t value);

getdns_return_t
getdns_context_set_edns_client_subnet_private(getdns_context *context, uint8_t value);

getdns_return_t
getdns_context_set_tls_query_padding_blocksize(getdns_context *context, uint16_t value);
getdns_return_t
getdns_context_get_resolution_type(getdns_context *context,
    getdns_resolution_t* value);

getdns_return_t
getdns_context_get_namespaces(getdns_context *context,
    size_t* namespace_count, getdns_namespace_t **namespaces);

getdns_return_t
getdns_context_get_dns_transport(getdns_context *context,
    getdns_transport_t* value);

getdns_return_t
getdns_context_get_dns_transport_list(getdns_context *context,
    size_t* transport_count, getdns_transport_list_t **transports);

getdns_return_t
getdns_context_get_limit_outstanding_queries(getdns_context *context,
    uint16_t* limit);

getdns_return_t
getdns_context_get_timeout(getdns_context *context, uint64_t* timeout);

getdns_return_t
getdns_context_get_idle_timeout(getdns_context *context, uint64_t* timeout);

getdns_return_t
getdns_context_get_follow_redirects(getdns_context *context,
    getdns_redirects_t* value);

getdns_return_t
getdns_context_get_dns_root_servers(getdns_context *context,
    getdns_list **addresses);

getdns_return_t
getdns_context_get_append_name(getdns_context *context,
    getdns_append_name_t* value);

getdns_return_t
getdns_context_get_suffix(getdns_context *context, getdns_list **value);

getdns_return_t
getdns_context_get_dnssec_trust_anchors(getdns_context *context,
    getdns_list **value);

getdns_return_t
getdns_context_get_dnssec_allowed_skew(getdns_context *context,
    uint32_t* value);

getdns_return_t
getdns_context_get_upstream_recursive_servers(getdns_context *context,
    getdns_list **upstream_list);

getdns_return_t
getdns_context_get_edns_maximum_udp_payload_size(getdns_context *context,
    uint16_t* value);

getdns_return_t
getdns_context_get_edns_extended_rcode(getdns_context *context,
    uint8_t* value);

getdns_return_t
getdns_context_get_edns_version(getdns_context *context, uint8_t* value);

getdns_return_t
getdns_context_get_edns_do_bit(getdns_context *context, uint8_t* value);

getdns_return_t
getdns_context_get_edns_client_subnet_private(getdns_context *context, uint8_t* value);

getdns_return_t
getdns_context_get_tls_query_padding_blocksize(getdns_context *context, uint16_t* value);

getdns_return_t
getdns_context_get_tls_authentication(getdns_context *context,
    getdns_tls_authentication_t* value);

getdns_return_t
getdns_context_get_round_robin_upstreams(getdns_context *context,
    uint8_t* value);

getdns_return_t
getdns_context_get_tls_backoff_time(getdns_context *context,
    uint16_t* value);

getdns_return_t
getdns_context_get_tls_connection_retries(getdns_context *context,
    uint16_t* value);

getdns_return_t
getdns_context_get_update_callback(getdns_context *context, void **userarg,
    void (**value) (getdns_context *, getdns_context_code_t, void *));

const char *getdns_get_version(void);
uint32_t getdns_get_version_number(void);
const char *getdns_get_api_version(void);
uint32_t getdns_get_api_version_number(void);

const char *getdns_get_errorstr_by_id(uint16_t err);

/* dict util */
/* set a string as bindata */
getdns_return_t getdns_dict_util_set_string(getdns_dict * dict,
    char *name, const char *value);

/* get a string from a dict.  the result must be freed if valid */
getdns_return_t getdns_dict_util_get_string(getdns_dict * dict,
    char *name, char **result);



getdns_return_t
getdns_validate_dnssec2(getdns_list *to_validate,
    getdns_list *support_records,
    getdns_list *trust_anchors,
    time_t validation_time, uint32_t skew);

getdns_dict* getdns_pubkey_pin_create_from_string(
    getdns_context* context,
    const char* str);


getdns_return_t getdns_pubkey_pinset_sanity_check(
    const getdns_list* pinset,
    getdns_list* errorlist);

getdns_return_t
getdns_context_config(getdns_context *context, const getdns_dict *config_dict);



int
getdns_pretty_snprint_dict(char *str, size_t size, const getdns_dict *dict);

char *
getdns_pretty_print_list(const getdns_list *some_list);

int
getdns_pretty_snprint_list(char *str, size_t size, const getdns_list *list);

char *
getdns_print_json_dict(const getdns_dict *some_dict, int pretty);

int
getdns_snprint_json_dict(
    char *str, size_t size, const getdns_dict *dict, int pretty);

char *
getdns_print_json_list(const getdns_list *some_list, int pretty);

int
getdns_snprint_json_list(
    char *str, size_t size, const getdns_list *list, int pretty);


getdns_return_t
getdns_rr_dict2wire(
    const getdns_dict *rr_dict, uint8_t **wire, size_t *wire_sz);

getdns_return_t
getdns_rr_dict2wire_buf(
    const getdns_dict *rr_dict, uint8_t *wire, size_t *wire_sz);

getdns_return_t
getdns_rr_dict2wire_scan(
    const getdns_dict *rr_dict, uint8_t **wire, int *wire_sz);


getdns_return_t
getdns_wire2rr_dict(
    const uint8_t *wire, size_t wire_sz, getdns_dict **rr_dict);

getdns_return_t
getdns_wire2rr_dict_buf(
    const uint8_t *wire, size_t *wire_sz, getdns_dict **rr_dict);

getdns_return_t
getdns_wire2rr_dict_scan(
    const uint8_t **wire, size_t *wire_sz, getdns_dict **rr_dict);


getdns_return_t
getdns_rr_dict2str(
    const getdns_dict *rr_dict, char **str);

getdns_return_t
getdns_rr_dict2str_buf(
    const getdns_dict *rr_dict, char *str, size_t *str_len);

getdns_return_t
getdns_rr_dict2str_scan(
    const getdns_dict *rr_dict, char **str, int *str_len);


getdns_return_t
getdns_str2rr_dict(
    const char *str, getdns_dict **rr_dict,
    const char *origin, uint32_t default_ttl);

getdns_return_t
getdns_fp2rr_list(
    FILE *in, getdns_list **rr_list,
    const char *origin, uint32_t default_ttl);

getdns_return_t
getdns_msg_dict2wire(
    const getdns_dict *msg_dict, uint8_t **wire, size_t *wire_sz);

getdns_return_t
getdns_msg_dict2wire_buf(
    const getdns_dict *msg_dict, uint8_t *wire, size_t *wire_sz);

getdns_return_t
getdns_msg_dict2wire_scan(
    const getdns_dict *msg_dict, uint8_t **wire, int *wire_sz);


getdns_return_t
getdns_wire2msg_dict(
    const uint8_t *wire, size_t wire_sz, getdns_dict **msg_dict);

getdns_return_t
getdns_wire2msg_dict_buf(
    const uint8_t *wire, size_t *wire_sz, getdns_dict **msg_dict);

getdns_return_t
getdns_wire2msg_dict_scan(
    const uint8_t **wire, size_t *wire_sz, getdns_dict **msg_dict);


getdns_return_t
getdns_msg_dict2str(
    const getdns_dict *msg_dict, char **str);

getdns_return_t
getdns_msg_dict2str_buf(
    const getdns_dict *msg_dict, char *str, size_t *str_len);

getdns_return_t
getdns_msg_dict2str_scan(
    const getdns_dict *msg_dict, char **str, int *str_len);

getdns_return_t
getdns_str2dict(const char *str, getdns_dict **dict);

getdns_return_t
getdns_str2list(const char *str, getdns_list **list);

getdns_return_t
getdns_str2bindata(const char *str, getdns_bindata **bindata);

getdns_return_t
getdns_str2int(const char *str, uint32_t *value);

typedef void (*getdns_request_handler_t)(
    getdns_context        *context,
    getdns_callback_type_t callback_type,
    getdns_dict           *request,
    void                  *userarg,
    getdns_transaction_t   request_id
);

getdns_return_t
getdns_context_set_listen_addresses(
    getdns_context *context, const getdns_list *listen_addresses,
    void *userarg, getdns_request_handler_t handler);

getdns_return_t
getdns_reply(getdns_context *context,
    getdns_dict *reply, getdns_transaction_t request_id);


/* WARNING! Function getdns_strerror is not in the API specification and
 * is likely to be removed from future versions of our implementation, to be
 * replaced by getdns_get_errorstr_by_id or something similar.
 * Please use getdns_get_errorstr_by_id instead of getdns_strerror.
 */
getdns_return_t getdns_strerror(getdns_return_t err, char *buf, size_t buflen);

getdns_return_t getdns_context_process_async(getdns_context* context);

/* Async support */
uint32_t getdns_context_get_num_pending_requests(getdns_context* context,
    struct timeval* next_timeout);

#ifdef __cplusplus
}
#endif

#endif