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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef _DNSTAP_H
#define _DNSTAP_H
/*****
***** Module Info
*****/
/*! \file
* \brief
* The dt (dnstap) module provides fast passive logging of DNS messages.
* Protocol Buffers. The protobuf schema for Dnstap messages is in the
* file dnstap.proto, which is compiled to dnstap.pb-c.c and dnstap.pb-c.h.
*/
#include <inttypes.h>
#include <stdbool.h>
#ifdef HAVE_DNSTAP
#include <fstrm.h>
#include <protobuf-c/protobuf-c.h>
#else
struct fstrm_iothr_options;
#endif /* HAVE_DNSTAP */
#include <isc/region.h>
#include <isc/sockaddr.h>
#include <isc/time.h>
#include <isc/types.h>
#include <dns/name.h>
#include <dns/rdataclass.h>
#include <dns/rdatatype.h>
#include <dns/types.h>
/*%
* Dnstap message types:
*
* STUB QUERY: SQ
* STUB RESPONSE: SR
* CLIENT QUERY: CQ
* CLIENT RESPONSE: CR
* AUTH QUERY: AQ
* AUTH RESPONSE: AR
* RESOLVER QUERY: RQ
* RESOLVER RESPONSE: RR
* FORWARDER QUERY: FQ
* FORWARDER RESPONSE: FR
*/
#define DNS_DTTYPE_SQ 0x0001
#define DNS_DTTYPE_SR 0x0002
#define DNS_DTTYPE_CQ 0x0004
#define DNS_DTTYPE_CR 0x0008
#define DNS_DTTYPE_AQ 0x0010
#define DNS_DTTYPE_AR 0x0020
#define DNS_DTTYPE_RQ 0x0040
#define DNS_DTTYPE_RR 0x0080
#define DNS_DTTYPE_FQ 0x0100
#define DNS_DTTYPE_FR 0x0200
#define DNS_DTTYPE_TQ 0x0400
#define DNS_DTTYPE_TR 0x0800
#define DNS_DTTYPE_QUERY \
(DNS_DTTYPE_SQ|DNS_DTTYPE_CQ|DNS_DTTYPE_AQ|\
DNS_DTTYPE_RQ|DNS_DTTYPE_FQ|DNS_DTTYPE_TQ)
#define DNS_DTTYPE_RESPONSE \
(DNS_DTTYPE_SR|DNS_DTTYPE_CR|DNS_DTTYPE_AR|\
DNS_DTTYPE_RR|DNS_DTTYPE_FR|DNS_DTTYPE_TR)
#define DNS_DTTYPE_ALL \
(DNS_DTTYPE_QUERY|DNS_DTTYPE_RESPONSE)
typedef enum {
dns_dtmode_none = 0,
dns_dtmode_file,
dns_dtmode_unix
} dns_dtmode_t;
typedef struct dns_dthandle dns_dthandle_t;
#ifdef HAVE_DNSTAP
struct dns_dtdata {
isc_mem_t *mctx;
void *frame;
bool query;
bool tcp;
dns_dtmsgtype_t type;
isc_time_t qtime;
isc_time_t rtime;
isc_region_t qaddr;
isc_region_t raddr;
uint32_t qport;
uint32_t rport;
isc_region_t msgdata;
dns_message_t *msg;
char namebuf[DNS_NAME_FORMATSIZE];
char typebuf[DNS_RDATATYPE_FORMATSIZE];
char classbuf[DNS_RDATACLASS_FORMATSIZE];
};
#endif /* HAVE_DNSTAP */
isc_result_t
dns_dt_create(isc_mem_t *mctx, dns_dtmode_t mode, const char *path,
struct fstrm_iothr_options **foptp, dns_dtenv_t **envp);
/*%<
* Create and initialize the dnstap environment.
*
* There should be a single global dnstap environment for the server;
* copies of it will be attached to each view.
*
* Notes:
*
*\li 'path' refers to a UNIX domain socket by default. It may
* optionally be prepended with "socket:" or "file:". If prepended
* with "file:", then dnstap logs are sent to a file instead of a
* socket.
*
*\li '*foptp' set the options for fstrm_iothr_init(). '*foptp' must have
* have had the number of input queues set and this should be set
* to the number of worker threads. Additionally the queue model
* should also be set. Other options may be set if desired.
* If dns_dt_create succeeds the *foptp is set to NULL.
*
* Requires:
*
*\li 'mctx' is a valid memory context.
*
*\li 'path' is a valid C string.
*
*\li 'fopt' is non NULL.
*
*\li envp != NULL && *envp == NULL
*
* Returns:
*
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMEMORY
*
*\li Other errors are possible.
*/
isc_result_t
dns_dt_reopen(dns_dtenv_t *env, int roll);
/*%<
* Reopens files established by dns_dt_create().
*
* If 'roll' is non-negative and 'env->mode' is dns_dtmode_file,
* then the file is automatically rolled over before reopening.
* The value of 'roll' indicates the number of backup log files to
* keep. If 'roll' is negative, or if 'env->mode' is dns_dtmode_unix,
* then the channel is simply reopened.
*
* Note: dns_dt_reopen() must be called in task exclusive mode.
*
* Requires:
*\li 'env' is a valid dnstap environment.
*/
isc_result_t
dns_dt_setidentity(dns_dtenv_t *env, const char *identity);
isc_result_t
dns_dt_setversion(dns_dtenv_t *env, const char *version);
/*%<
* Set the "identity" and "version" strings to be sent in dnstap messages.
*
* Requires:
*
*\li 'env' is a valid dnstap environment.
*/
void
dns_dt_attach(dns_dtenv_t *source, dns_dtenv_t **destp);
/*%<
* Attach '*destp' to 'source', incrementing the reference counter.
*
* Requires:
*
*\li 'source' is a valid dnstap environment.
*
*\li 'destp' is not NULL and '*destp' is NULL.
*
*\li *destp is attached to source.
*/
void
dns_dt_detach(dns_dtenv_t **envp);
/*%<
* Detach '*envp', decrementing the reference counter.
*
* Requires:
*
*\li '*envp' is a valid dnstap environment.
*
* Ensures:
*
*\li '*envp' will be destroyed when the number of references reaches zero.
*
*\li '*envp' is NULL.
*/
isc_result_t
dns_dt_getstats(dns_dtenv_t *env, isc_stats_t **statsp);
/*%<
* Attach to the stats struct if it exists.
*
* Requires:
*
*\li 'env' is a valid dnstap environment.
*
*\li 'statsp' is non NULL and '*statsp' is NULL.
*
* Returns:
*
*\li ISC_R_SUCCESS
*
*\li ISC_R_NOTFOUND
*/
void
dns_dt_shutdown(void);
/*%<
* Shuts down dnstap and frees global resources. This function must only
* be called immediately before server shutdown.
*/
void
dns_dt_send(dns_view_t *view, dns_dtmsgtype_t msgtype,
isc_sockaddr_t *qaddr, isc_sockaddr_t *dstaddr,
bool tcp, isc_region_t *zone, isc_time_t *qtime,
isc_time_t *rtime, isc_buffer_t *buf);
/*%<
* Sends a dnstap message to the log, if 'msgtype' is one of the message
* types represented in 'view->dttypes'.
*
* Parameters are: 'qaddr' (query address, i.e, the address of the
* query initiator); 'raddr' (response address, i.e., the address of
* the query responder); 'tcp' (boolean indicating whether the transaction
* was over TCP); 'zone' (the authoritative zone or bailiwick, in
* uncompressed wire format), 'qtime' and 'rtime' (query and response
* times; if NULL, they are set to the current time); and 'buf' (the
* DNS message being logged, in wire format).
*
* Requires:
*
*\li 'view' is a valid view, and 'view->dtenv' is NULL or is a
* valid dnstap environment.
*/
isc_result_t
dns_dt_parse(isc_mem_t *mctx, isc_region_t *src, dns_dtdata_t **destp);
/*%<
* Converts a raw dnstap frame in 'src' to a parsed dnstap data structure
* in '*destp'.
*
* Requires:
*\li 'src' is not NULL
*
*\li 'destp' is not NULL and '*destp' points to a valid buffer.
*
* Returns:
*\li #ISC_R_SUCCESS on success
*
*\li Other errors are possible.
*/
isc_result_t
dns_dt_datatotext(dns_dtdata_t *d, isc_buffer_t **dest);
/*%<
* Converts a parsed dnstap data structure 'd' to text, storing
* the result in the buffer 'dest'. If 'dest' points to a dynamically
* allocated buffer, then it may be reallocated as needed.
*
* (XXX: add a 'long_form' option to generate a detailed listing of
* dnstap data instead * of a one-line summary.)
*
* Requires:
*\li 'd' is not NULL
*
*\li 'dest' is not NULL and '*dest' points to a valid buffer.
*
* Returns:
*\li #ISC_R_SUCCESS on success
*\li #ISC_R_NOSPACE if buffer is not dynamic and runs out of space
*\li #ISC_R_NOMEMORY if buffer is dynamic but memory could not be allocated
*
*\li Other errors are possible.
*/
void
dns_dtdata_free(dns_dtdata_t **dp);
/*%<
* Frees the specified dns_dtdata structure and all its members,
* and sets *dp to NULL.
*/
isc_result_t
dns_dt_open(const char *filename, dns_dtmode_t mode,
isc_mem_t *mctx, dns_dthandle_t **handlep);
/*%<
* Opens a dnstap framestream at 'filename' and stores a pointer to the
* reader object in a dns_dthandle_t structure.
*
* The caller is responsible for allocating the handle structure.
*
* (XXX: Currently only file readers are supported, not unix-domain socket
* readers.)
*
* Requires:
*
*\li 'filename' is not NULL.
*
*\li 'handlep' is not NULL and '*handlep' is NULL.
*
*\li '*mctx' is not a valid memory context.
*
* Returns:
*
*\li #ISC_R_SUCCESS on success
*\li #ISC_R_NOTIMPLEMENTED if 'mode' is not dns_dtmode_file. (XXX)
*\li #ISC_R_NOMEMORY if the fstrm library was unable to allocate a
* reader or options structure
*\li #ISC_R_FAILURE if 'filename' could not be opened.
*\li #DNS_R_BADDNSTAP if 'filename' does not contain a dnstap
* framestream.
*/
isc_result_t
dns_dt_getframe(dns_dthandle_t *handle, uint8_t **bufp, size_t *sizep);
/*%<
* Read a dnstap frame from the framstream reader in 'handle', storing
* a pointer to it in '*bufp' and its size in '*sizep'.
*
* Requires:
*
*\li 'handle' is not NULL
*\li 'bufp' is not NULL
*\li 'sizep' is not NULL
*
* Ensures:
* \li if returning ISC_R_SUCCESS then '*bufp' is not NULL
*
* Returns:
*
*\li #ISC_R_SUCCESS on success
*\li #ISC_R_NOMORE at the end of the frame stream
*\li #ISC_R_FAILURE for any other failure
*/
void
dns_dt_close(dns_dthandle_t **handlep);
/*%<
* Closes the dnstap file referenced by 'handle'.
*
* Requires:
*
*\li '*handlep' is not NULL
*/
#endif /* _DNSTAP_H */