Logging API reference

Group names

LOG_GRP_SYSTEM_TAG

system: catch-all log for generic messages

LOG_GRP_CACHE_TAG

cache: operations related to cache

LOG_GRP_IO_TAG

io: input/output operations

LOG_GRP_NETWORK_TAG

net: network configuration and operation

LOG_GRP_TA_TAG

ta: basic log for trust anchors (TA)

LOG_GRP_TASENTINEL_TAG

tasent: TA sentinel

LOG_GRP_TASIGNALING_TAG

tasign: TA signal query

LOG_GRP_TAUPDATE_TAG

taupd: TA update

LOG_GRP_TLS_TAG

tls: TLS encryption layer

LOG_GRP_GNUTLS_TAG

gnutls: low-level logs from GnuTLS

LOG_GRP_TLSCLIENT_TAG

tls_cl: TLS client messages (used for TLS forwarding)

LOG_GRP_XDP_TAG

xdp: operations related to XDP

LOG_GRP_DOH_TAG

doh: DNS-over-HTTPS logger (doh2 implementation)

LOG_GRP_DNSSEC_TAG

dnssec: operations related to DNSSEC

LOG_GRP_HINT_TAG

hint: operations related to static hints

LOG_GRP_PLAN_TAG

plan: operations related to resolution plan

LOG_GRP_ITERATOR_TAG

iterat: operations related to iterate layer

LOG_GRP_VALIDATOR_TAG

valdtr: operations related to validate layer

LOG_GRP_RESOLVER_TAG

resolv: operations related to resolving

LOG_GRP_SELECTION_TAG

select: operations related to server selection

LOG_GRP_ZCUT_TAG

zoncut: operations related to zone cut

LOG_GRP_COOKIES_TAG

cookie: operations related to cookies

LOG_GRP_STATISTICS_TAG

statis: operations related to statistics

LOG_GRP_REBIND_TAG

rebind: operations related to rebinding

LOG_GRP_WORKER_TAG

worker: operations related to worker layer

LOG_GRP_POLICY_TAG

policy: operations related to policy

LOG_GRP_DAF_TAG

daf: operations related to DAF module

LOG_GRP_DETECTTIMEJUMP_TAG

timejm: operations related to time jump

LOG_GRP_DETECTTIMESKEW_TAG

timesk: operations related to time skew

LOG_GRP_GRAPHITE_TAG

graphi: operations related to graphite

LOG_GRP_PREFILL_TAG

prefil: operations related to prefill

LOG_GRP_PRIMING_TAG

primin: operations related to priming

LOG_GRP_SRVSTALE_TAG

srvstl: operations related to serve stale

LOG_GRP_WATCHDOG_TAG

wtchdg: operations related to watchdog

LOG_GRP_NSID_TAG

nsid: operations related to NSID

LOG_GRP_DNSTAP_TAG

dnstap: operations related to dnstap

LOG_GRP_TESTS_TAG

tests: operations related to tests

LOG_GRP_DOTAUTH_TAG

dotaut: DNS-over-TLS against authoritative servers

LOG_GRP_HTTP_TAG

http: http module, its web interface and legacy DNS-over-HTTPS

LOG_GRP_CONTROL_TAG

contrl: TTY control sockets

LOG_GRP_MODULE_TAG

module: suitable for user-defined modules

LOG_GRP_DEVEL_TAG

devel: for development purposes

LOG_GRP_RENUMBER_TAG

renum: operation related to renumber

LOG_GRP_EDE_TAG

exterr: extended error module

LOG_GRP_RULES_TAG

rules: new policy rules (their processing)

LOG_GRP_PROTOLAYER_TAG

prlayr: protocol layer system (session2)

LOG_GRP_DEFER_TAG

defer: prioritization of requests

LOG_GRP_REQDBG_TAG

reqdbg: debug logs enabled by policy actions

Logging levels

We stick very close to POSIX syslog.h

kr_log_debug(grp, fmt, ...)

Debugging message.

Can be very verbose. The level is most often used through VERBOSE_MSG.

kr_log_info(grp, fmt, ...)
kr_log_notice(grp, fmt, ...)
LOG_DEFAULT_LEVEL

Levels less severe than notice are not logged by default.

kr_log_warning(grp, fmt, ...)
kr_log_error(grp, fmt, ...)

Significant error.

The process continues, except for configuration errors during startup.

kr_log_crit(grp, fmt, ...)

Critical condition.

The process dies. Bad configuration should not cause this.

kr_log_deprecate(grp, fmt, ...)
kr_log(fmt, ...)

Logging function for user modules.

Uses group LOG_GRP_MODULE and info level.

Parameters:
  • fmt – Format string

Defines

LOG_UNKNOWN_LEVEL

Negative error value.

LOG_GNUTLS_LEVEL

GnuTLS level is 5.

KR_LOG_LEVEL_IS(exp)
kr_log_req(req, qry_uid, indent, grp, fmt, ...)

Log a debug-level message from a kr_request.

Typically we call kr_log_q() instead.

Parameters:
  • qry_uid – query ID to append to request ID, 0 means “no query”

  • indent – level of indentation between [group ][req.qry] and message

  • grp – GROUP_NAME (without the LOG_GRP_ prefix)

  • fmt – printf-like format string

kr_log_q(qry, grp, fmt, ...)

Log a debug-level message from a kr_query.

Parameters:
  • qry – current query

  • grp – GROUP_NAME (without the LOG_GRP_ prefix)

  • fmt – printf-like format string

kr_log_is_debug(grp, req)

Return whether a particular log group in a request is in debug/verbose mode.

Typically you use this as condition to compute some data to be logged, in case that’s considered too expensive to do unless it really gets logged.

The request can be NULL, and there’s a _qry() shorthand to specify query instead.

kr_log_is_debug_qry(grp, qry)
KR_LOG_SJM_STR(x)
SD_JOURNAL_METADATA

Typedefs

typedef int kr_log_level_t

Enums

enum kr_log_target_t

Values:

enumerator LOG_TARGET_SYSLOG
enumerator LOG_TARGET_STDERR
enumerator LOG_TARGET_STDOUT
enumerator LOG_TARGET_DEFAULT
enum kr_log_group

Values:

enumerator LOG_GRP_UNKNOWN
enumerator LOG_GRP_SYSTEM
enumerator LOG_GRP_CACHE
enumerator LOG_GRP_IO
enumerator LOG_GRP_NETWORK
enumerator LOG_GRP_TA
enumerator LOG_GRP_TLS
enumerator LOG_GRP_GNUTLS
enumerator LOG_GRP_TLSCLIENT
enumerator LOG_GRP_XDP
enumerator LOG_GRP_DOH
enumerator LOG_GRP_DNSSEC
enumerator LOG_GRP_HINT
enumerator LOG_GRP_PLAN
enumerator LOG_GRP_ITERATOR
enumerator LOG_GRP_VALIDATOR
enumerator LOG_GRP_RESOLVER
enumerator LOG_GRP_SELECTION
enumerator LOG_GRP_ZCUT
enumerator LOG_GRP_COOKIES
enumerator LOG_GRP_STATISTICS
enumerator LOG_GRP_REBIND
enumerator LOG_GRP_WORKER
enumerator LOG_GRP_POLICY
enumerator LOG_GRP_TASENTINEL
enumerator LOG_GRP_TASIGNALING
enumerator LOG_GRP_TAUPDATE
enumerator LOG_GRP_DAF
enumerator LOG_GRP_DETECTTIMEJUMP
enumerator LOG_GRP_DETECTTIMESKEW
enumerator LOG_GRP_GRAPHITE
enumerator LOG_GRP_PREFILL
enumerator LOG_GRP_PRIMING
enumerator LOG_GRP_SRVSTALE
enumerator LOG_GRP_WATCHDOG
enumerator LOG_GRP_NSID
enumerator LOG_GRP_DNSTAP
enumerator LOG_GRP_TESTS
enumerator LOG_GRP_DOTAUTH
enumerator LOG_GRP_HTTP
enumerator LOG_GRP_CONTROL
enumerator LOG_GRP_MODULE
enumerator LOG_GRP_DEVEL
enumerator LOG_GRP_RENUMBER
enumerator LOG_GRP_EDE
enumerator LOG_GRP_RULES
enumerator LOG_GRP_PROTOLAYER
enumerator LOG_GRP_DEFER
enumerator LOG_GRP_REQDBG

Functions

void kr_log_target_set(kr_log_target_t target)

Set the current logging target.

bool kr_log_group_is_set(enum kr_log_group group)
void kr_log_group_add(enum kr_log_group group)
void kr_log_group_reset(void)
const char *kr_log_grp2name(enum kr_log_group group)
enum kr_log_group kr_log_name2grp(const char *name)
void kr_log_level_set(kr_log_level_t level)

Set the current logging level.

const char *kr_log_level2name(kr_log_level_t level)
kr_log_level_t kr_log_name2level(const char *name)

Return negative on error.

void kr_log_req1(const struct kr_request *const req, uint32_t qry_uid, const unsigned int indent, enum kr_log_group group, const char *tag, const char *fmt, ...)
void kr_log_q1(const struct kr_query *qry, enum kr_log_group group, const char *tag, const char *fmt, ...)
bool kr_log_is_debug_fun(enum kr_log_group group, const struct kr_request *req)
void kr_log_fmt(enum kr_log_group group, kr_log_level_t level, const char *file, const char *line, const char *func, const char *fmt, ...)

Variables

kr_log_target_t kr_log_target

Current logging target.

Read only, please.

kr_log_level_t kr_log_level

Current logging level.

Read only, please.