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dnstap.h
/* * 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 */
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