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131879fb92
This allows extracting a list of all log messages including their ECs and autogenerated unique IDs for them. Signed-off-by: David Lamparter <equinox@diac24.net>
262 lines
9.1 KiB
C
262 lines
9.1 KiB
C
/*
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* Copyright (c) 2015-19 David Lamparter, for NetDEF, Inc.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _FRR_ZLOG_H
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#define _FRR_ZLOG_H
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <sys/uio.h>
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#include "atomlist.h"
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#include "frrcu.h"
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#include "memory.h"
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#include "hook.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern char zlog_prefix[];
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extern size_t zlog_prefixsz;
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extern int zlog_tmpdirfd;
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struct xref_logmsg {
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struct xref xref;
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const char *fmtstring;
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uint32_t priority;
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uint32_t ec;
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};
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struct xrefdata_logmsg {
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struct xrefdata xrefdata;
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/* nothing more here right now */
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};
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/* These functions are set up to write to stdout/stderr without explicit
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* initialization and/or before config load. There is no need to call e.g.
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* fprintf(stderr, ...) just because it's "too early" at startup. Depending
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* on context, it may still be the right thing to use fprintf though -- try to
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* determine wether something is a log message or something else.
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*/
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extern void vzlogx(const struct xref_logmsg *xref, int prio,
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const char *fmt, va_list ap);
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#define vzlog(prio, ...) vzlogx(NULL, prio, __VA_ARGS__)
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PRINTFRR(2, 3)
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static inline void zlog(int prio, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vzlog(prio, fmt, ap);
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va_end(ap);
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}
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PRINTFRR(2, 3)
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static inline void zlog_ref(const struct xref_logmsg *xref,
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const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vzlogx(xref, xref->priority, fmt, ap);
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va_end(ap);
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}
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#define _zlog_ref(prio, msg, ...) do { \
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static struct xrefdata _xrefdata = { \
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.hashstr = (msg), \
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.hashu32 = { (prio), 0 }, \
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}; \
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static const struct xref_logmsg _xref __attribute__((used)) = {\
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.xref = XREF_INIT(XREFT_LOGMSG, &_xrefdata, __func__), \
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.fmtstring = (msg), \
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.priority = (prio), \
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}; \
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XREF_LINK(_xref.xref); \
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zlog_ref(&_xref, (msg), ## __VA_ARGS__); \
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} while (0)
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#define zlog_err(...) _zlog_ref(LOG_ERR, __VA_ARGS__)
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#define zlog_warn(...) _zlog_ref(LOG_WARNING, __VA_ARGS__)
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#define zlog_info(...) _zlog_ref(LOG_INFO, __VA_ARGS__)
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#define zlog_notice(...) _zlog_ref(LOG_NOTICE, __VA_ARGS__)
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#define zlog_debug(...) _zlog_ref(LOG_DEBUG, __VA_ARGS__)
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#define _zlog_ecref(ec_, prio, msg, ...) do { \
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static struct xrefdata _xrefdata = { \
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.hashstr = (msg), \
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.hashu32 = { (prio), (ec_) }, \
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}; \
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static const struct xref_logmsg _xref __attribute__((used)) = {\
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.xref = XREF_INIT(XREFT_LOGMSG, &_xrefdata, __func__), \
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.fmtstring = (msg), \
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.priority = (prio), \
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.ec = (ec_), \
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}; \
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XREF_LINK(_xref.xref); \
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zlog_ref(&_xref, "[EC %u] " msg, ec_, ## __VA_ARGS__); \
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} while (0)
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#define flog_err(ferr_id, format, ...) \
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_zlog_ecref(ferr_id, LOG_ERR, format, ## __VA_ARGS__)
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#define flog_warn(ferr_id, format, ...) \
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_zlog_ecref(ferr_id, LOG_WARNING, format, ## __VA_ARGS__)
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#define flog_err_sys(ferr_id, format, ...) \
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flog_err(ferr_id, format, ##__VA_ARGS__)
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#define flog(priority, ferr_id, format, ...) \
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zlog(priority, "[EC %u] " format, ferr_id, ##__VA_ARGS__)
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extern void zlog_sigsafe(const char *text, size_t len);
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/* extra priority value to disable a target without deleting it */
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#define ZLOG_DISABLED (LOG_EMERG-1)
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/* zlog_msg encapsulates a particular logging call from somewhere in the code.
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* The same struct is passed around to all zlog_targets.
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*
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* This is used to defer formatting the log message until it is actually
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* requested by one of the targets. If none of the targets needs the message
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* formatted, the formatting call is avoided entirely.
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*
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* This struct is opaque / private to the core zlog code. Logging targets
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* should use zlog_msg_* functions to get text / timestamps / ... for a
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* message.
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*/
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struct zlog_msg;
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extern int zlog_msg_prio(struct zlog_msg *msg);
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extern const struct xref_logmsg *zlog_msg_xref(struct zlog_msg *msg);
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/* pass NULL as textlen if you don't need it. */
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extern const char *zlog_msg_text(struct zlog_msg *msg, size_t *textlen);
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/* timestamp formatting control flags */
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/* sub-second digit count */
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#define ZLOG_TS_PREC 0xfU
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/* 8601: 0000-00-00T00:00:00Z (if used with ZLOG_TS_UTC)
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* 0000-00-00T00:00:00+00:00 (otherwise)
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* Legacy: 0000/00/00 00:00:00 (no TZ indicated!)
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*/
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#define ZLOG_TS_ISO8601 (1 << 8)
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#define ZLOG_TS_LEGACY (1 << 9)
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/* default is local time zone */
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#define ZLOG_TS_UTC (1 << 10)
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extern size_t zlog_msg_ts(struct zlog_msg *msg, char *out, size_t outsz,
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uint32_t flags);
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/* This list & struct implements the actual logging targets. It is accessed
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* lock-free from all threads, and thus MUST only be changed atomically, i.e.
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* RCU.
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*
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* Since there's no atomic replace, the replacement action is an add followed
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* by a delete. This means that during logging config changes, log messages
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* may be duplicated in the log target that is being changed. The old entry
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* being changed MUST also at the very least not crash or do other stupid
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* things.
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*
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* This list and struct are NOT related to config. Logging config is kept
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* separately, and results in creating appropriate zlog_target(s) to realize
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* the config. Log targets may also be created from varying sources, e.g.
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* command line options, or VTY commands ("log monitor").
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*
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* struct zlog_target is intended to be embedded into a larger structure that
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* contains additional field for the specific logging target, e.g. an fd or
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* additional options. It MUST be the first field in that larger struct.
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*/
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PREDECL_ATOMLIST(zlog_targets)
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struct zlog_target {
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struct zlog_targets_item head;
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int prio_min;
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void (*logfn)(struct zlog_target *zt, struct zlog_msg *msg[],
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size_t nmsgs);
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/* for crash handlers, set to NULL if log target can't write crash logs
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* without possibly deadlocking (AS-Safe)
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*
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* text is not \0 terminated & split up into lines (e.g. no \n)
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*/
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void (*logfn_sigsafe)(struct zlog_target *zt, const char *text,
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size_t len);
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struct rcu_head rcu_head;
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};
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/* make a copy for RCUpdating. oldzt may be NULL to allocate a fresh one. */
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extern struct zlog_target *zlog_target_clone(struct memtype *mt,
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struct zlog_target *oldzt,
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size_t size);
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/* update the zlog_targets list; both oldzt and newzt may be NULL. You
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* still need to zlog_target_free() the old target afterwards if it wasn't
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* NULL.
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*
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* Returns oldzt so you can zlog_target_free(zlog_target_replace(old, new));
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* (Some log targets may need extra cleanup inbetween, but remember the old
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* target MUST remain functional until the end of the current RCU cycle.)
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*/
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extern struct zlog_target *zlog_target_replace(struct zlog_target *oldzt,
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struct zlog_target *newzt);
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/* Mostly for symmetry for zlog_target_clone(), just rcu_free() internally. */
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#define zlog_target_free(mt, zt) \
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rcu_free(mt, zt, rcu_head)
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extern void zlog_init(const char *progname, const char *protoname,
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unsigned short instance, uid_t uid, gid_t gid);
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DECLARE_HOOK(zlog_init, (const char *progname, const char *protoname,
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unsigned short instance, uid_t uid, gid_t gid),
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(progname, protoname, instance, uid, gid))
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extern void zlog_fini(void);
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DECLARE_KOOH(zlog_fini, (), ())
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/* for tools & test programs, i.e. anything not a daemon.
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* (no cleanup needed at exit)
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*/
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extern void zlog_aux_init(const char *prefix, int prio_min);
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DECLARE_HOOK(zlog_aux_init, (const char *prefix, int prio_min),
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(prefix, prio_min))
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extern void zlog_startup_end(void);
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extern void zlog_tls_buffer_init(void);
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extern void zlog_tls_buffer_flush(void);
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extern void zlog_tls_buffer_fini(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _FRR_ZLOG_H */
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