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freebsd-dev/lib/isc/log.c
Doug Barton b0e69f719c Vendor import of BIND 9.6.1rc1
2009-05-31 00:11:36 +00:00

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/*
* Copyright (C) 2004-2007, 2009 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2003 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: log.c,v 1.94.332.5 2009/02/16 02:04:05 marka Exp $ */
/*! \file
* \author Principal Authors: DCL */
#include <config.h>
#include <errno.h>
#include <stdlib.h>
#include <limits.h>
#include <time.h>
#include <sys/types.h> /* dev_t FreeBSD 2.1 */
#include <isc/dir.h>
#include <isc/file.h>
#include <isc/log.h>
#include <isc/magic.h>
#include <isc/mem.h>
#include <isc/msgs.h>
#include <isc/print.h>
#include <isc/stat.h>
#include <isc/stdio.h>
#include <isc/string.h>
#include <isc/time.h>
#include <isc/util.h>
#define LCTX_MAGIC ISC_MAGIC('L', 'c', 't', 'x')
#define VALID_CONTEXT(lctx) ISC_MAGIC_VALID(lctx, LCTX_MAGIC)
#define LCFG_MAGIC ISC_MAGIC('L', 'c', 'f', 'g')
#define VALID_CONFIG(lcfg) ISC_MAGIC_VALID(lcfg, LCFG_MAGIC)
/*
* XXXDCL make dynamic?
*/
#define LOG_BUFFER_SIZE (8 * 1024)
#ifndef PATH_MAX
#define PATH_MAX 1024 /* AIX and others don't define this. */
#endif
/*!
* This is the structure that holds each named channel. A simple linked
* list chains all of the channels together, so an individual channel is
* found by doing strcmp()s with the names down the list. Their should
* be no performance penalty from this as it is expected that the number
* of named channels will be no more than a dozen or so, and name lookups
* from the head of the list are only done when isc_log_usechannel() is
* called, which should also be very infrequent.
*/
typedef struct isc_logchannel isc_logchannel_t;
struct isc_logchannel {
char * name;
unsigned int type;
int level;
unsigned int flags;
isc_logdestination_t destination;
ISC_LINK(isc_logchannel_t) link;
};
/*!
* The logchannellist structure associates categories and modules with
* channels. First the appropriate channellist is found based on the
* category, and then each structure in the linked list is checked for
* a matching module. It is expected that the number of channels
* associated with any given category will be very short, no more than
* three or four in the more unusual cases.
*/
typedef struct isc_logchannellist isc_logchannellist_t;
struct isc_logchannellist {
const isc_logmodule_t * module;
isc_logchannel_t * channel;
ISC_LINK(isc_logchannellist_t) link;
};
/*!
* This structure is used to remember messages for pruning via
* isc_log_[v]write1().
*/
typedef struct isc_logmessage isc_logmessage_t;
struct isc_logmessage {
char * text;
isc_time_t time;
ISC_LINK(isc_logmessage_t) link;
};
/*!
* The isc_logconfig structure is used to store the configurable information
* about where messages are actually supposed to be sent -- the information
* that could changed based on some configuration file, as opposed to the
* the category/module specification of isc_log_[v]write[1] that is compiled
* into a program, or the debug_level which is dynamic state information.
*/
struct isc_logconfig {
unsigned int magic;
isc_log_t * lctx;
ISC_LIST(isc_logchannel_t) channels;
ISC_LIST(isc_logchannellist_t) *channellists;
unsigned int channellist_count;
unsigned int duplicate_interval;
int highest_level;
char * tag;
isc_boolean_t dynamic;
};
/*!
* This isc_log structure provides the context for the isc_log functions.
* The log context locks itself in isc_log_doit, the internal backend to
* isc_log_write. The locking is necessary both to provide exclusive access
* to the buffer into which the message is formatted and to guard against
* competing threads trying to write to the same syslog resource. (On
* some systems, such as BSD/OS, stdio is thread safe but syslog is not.)
* Unfortunately, the lock cannot guard against a _different_ logging
* context in the same program competing for syslog's attention. Thus
* There Can Be Only One, but this is not enforced.
* XXXDCL enforce it?
*
* Note that the category and module information is not locked.
* This is because in the usual case, only one isc_log_t is ever created
* in a program, and the category/module registration happens only once.
* XXXDCL it might be wise to add more locking overall.
*/
struct isc_log {
/* Not locked. */
unsigned int magic;
isc_mem_t * mctx;
isc_logcategory_t * categories;
unsigned int category_count;
isc_logmodule_t * modules;
unsigned int module_count;
int debug_level;
isc_mutex_t lock;
/* Locked by isc_log lock. */
isc_logconfig_t * logconfig;
char buffer[LOG_BUFFER_SIZE];
ISC_LIST(isc_logmessage_t) messages;
};
/*!
* Used when ISC_LOG_PRINTLEVEL is enabled for a channel.
*/
static const char *log_level_strings[] = {
"debug",
"info",
"notice",
"warning",
"error",
"critical"
};
/*!
* Used to convert ISC_LOG_* priorities into syslog priorities.
* XXXDCL This will need modification for NT.
*/
static const int syslog_map[] = {
LOG_DEBUG,
LOG_INFO,
LOG_NOTICE,
LOG_WARNING,
LOG_ERR,
LOG_CRIT
};
/*!
* When adding new categories, a corresponding ISC_LOGCATEGORY_foo
* definition needs to be added to <isc/log.h>.
*
* The default category is provided so that the internal default can
* be overridden. Since the default is always looked up as the first
* channellist in the log context, it must come first in isc_categories[].
*/
LIBISC_EXTERNAL_DATA isc_logcategory_t isc_categories[] = {
{ "default", 0 }, /* "default" must come first. */
{ "general", 0 },
{ NULL, 0 }
};
/*!
* See above comment for categories on LIBISC_EXTERNAL_DATA, and apply it to modules.
*/
LIBISC_EXTERNAL_DATA isc_logmodule_t isc_modules[] = {
{ "socket", 0 },
{ "time", 0 },
{ "interface", 0 },
{ "timer", 0 },
{ "file", 0 },
{ NULL, 0 }
};
/*!
* This essentially constant structure must be filled in at run time,
* because its channel member is pointed to a channel that is created
* dynamically with isc_log_createchannel.
*/
static isc_logchannellist_t default_channel;
/*!
* libisc logs to this context.
*/
LIBISC_EXTERNAL_DATA isc_log_t *isc_lctx = NULL;
/*!
* Forward declarations.
*/
static isc_result_t
assignchannel(isc_logconfig_t *lcfg, unsigned int category_id,
const isc_logmodule_t *module, isc_logchannel_t *channel);
static isc_result_t
sync_channellist(isc_logconfig_t *lcfg);
static isc_result_t
greatest_version(isc_logchannel_t *channel, int *greatest);
static isc_result_t
roll_log(isc_logchannel_t *channel);
static void
isc_log_doit(isc_log_t *lctx, isc_logcategory_t *category,
isc_logmodule_t *module, int level, isc_boolean_t write_once,
isc_msgcat_t *msgcat, int msgset, int msg,
const char *format, va_list args)
ISC_FORMAT_PRINTF(9, 0);
/*@{*/
/*!
* Convenience macros.
*/
#define FACILITY(channel) (channel->destination.facility)
#define FILE_NAME(channel) (channel->destination.file.name)
#define FILE_STREAM(channel) (channel->destination.file.stream)
#define FILE_VERSIONS(channel) (channel->destination.file.versions)
#define FILE_MAXSIZE(channel) (channel->destination.file.maximum_size)
#define FILE_MAXREACHED(channel) (channel->destination.file.maximum_reached)
/*@}*/
/****
**** Public interfaces.
****/
/*
* Establish a new logging context, with default channels.
*/
isc_result_t
isc_log_create(isc_mem_t *mctx, isc_log_t **lctxp, isc_logconfig_t **lcfgp) {
isc_log_t *lctx;
isc_logconfig_t *lcfg = NULL;
isc_result_t result;
REQUIRE(mctx != NULL);
REQUIRE(lctxp != NULL && *lctxp == NULL);
REQUIRE(lcfgp == NULL || *lcfgp == NULL);
lctx = isc_mem_get(mctx, sizeof(*lctx));
if (lctx != NULL) {
lctx->mctx = mctx;
lctx->categories = NULL;
lctx->category_count = 0;
lctx->modules = NULL;
lctx->module_count = 0;
lctx->debug_level = 0;
ISC_LIST_INIT(lctx->messages);
result = isc_mutex_init(&lctx->lock);
if (result != ISC_R_SUCCESS) {
isc_mem_put(mctx, lctx, sizeof(*lctx));
return (result);
}
/*
* Normally setting the magic number is the last step done
* in a creation function, but a valid log context is needed
* by isc_log_registercategories and isc_logconfig_create.
* If either fails, the lctx is destroyed and not returned
* to the caller.
*/
lctx->magic = LCTX_MAGIC;
isc_log_registercategories(lctx, isc_categories);
isc_log_registermodules(lctx, isc_modules);
result = isc_logconfig_create(lctx, &lcfg);
} else
result = ISC_R_NOMEMORY;
if (result == ISC_R_SUCCESS)
result = sync_channellist(lcfg);
if (result == ISC_R_SUCCESS) {
lctx->logconfig = lcfg;
*lctxp = lctx;
if (lcfgp != NULL)
*lcfgp = lcfg;
} else {
if (lcfg != NULL)
isc_logconfig_destroy(&lcfg);
if (lctx != NULL)
isc_log_destroy(&lctx);
}
return (result);
}
isc_result_t
isc_logconfig_create(isc_log_t *lctx, isc_logconfig_t **lcfgp) {
isc_logconfig_t *lcfg;
isc_logdestination_t destination;
isc_result_t result = ISC_R_SUCCESS;
int level = ISC_LOG_INFO;
REQUIRE(lcfgp != NULL && *lcfgp == NULL);
REQUIRE(VALID_CONTEXT(lctx));
lcfg = isc_mem_get(lctx->mctx, sizeof(*lcfg));
if (lcfg != NULL) {
lcfg->lctx = lctx;
lcfg->channellists = NULL;
lcfg->channellist_count = 0;
lcfg->duplicate_interval = 0;
lcfg->highest_level = level;
lcfg->tag = NULL;
lcfg->dynamic = ISC_FALSE;
ISC_LIST_INIT(lcfg->channels);
/*
* Normally the magic number is the last thing set in the
* structure, but isc_log_createchannel() needs a valid
* config. If the channel creation fails, the lcfg is not
* returned to the caller.
*/
lcfg->magic = LCFG_MAGIC;
} else
result = ISC_R_NOMEMORY;
/*
* Create the default channels:
* default_syslog, default_stderr, default_debug and null.
*/
if (result == ISC_R_SUCCESS) {
destination.facility = LOG_DAEMON;
result = isc_log_createchannel(lcfg, "default_syslog",
ISC_LOG_TOSYSLOG, level,
&destination, 0);
}
if (result == ISC_R_SUCCESS) {
destination.file.stream = stderr;
destination.file.name = NULL;
destination.file.versions = ISC_LOG_ROLLNEVER;
destination.file.maximum_size = 0;
result = isc_log_createchannel(lcfg, "default_stderr",
ISC_LOG_TOFILEDESC,
level,
&destination,
ISC_LOG_PRINTTIME);
}
if (result == ISC_R_SUCCESS) {
/*
* Set the default category's channel to default_stderr,
* which is at the head of the channels list because it was
* just created.
*/
default_channel.channel = ISC_LIST_HEAD(lcfg->channels);
destination.file.stream = stderr;
destination.file.name = NULL;
destination.file.versions = ISC_LOG_ROLLNEVER;
destination.file.maximum_size = 0;
result = isc_log_createchannel(lcfg, "default_debug",
ISC_LOG_TOFILEDESC,
ISC_LOG_DYNAMIC,
&destination,
ISC_LOG_PRINTTIME);
}
if (result == ISC_R_SUCCESS)
result = isc_log_createchannel(lcfg, "null",
ISC_LOG_TONULL,
ISC_LOG_DYNAMIC,
NULL, 0);
if (result == ISC_R_SUCCESS)
*lcfgp = lcfg;
else
if (lcfg != NULL)
isc_logconfig_destroy(&lcfg);
return (result);
}
isc_logconfig_t *
isc_logconfig_get(isc_log_t *lctx) {
REQUIRE(VALID_CONTEXT(lctx));
ENSURE(lctx->logconfig != NULL);
return (lctx->logconfig);
}
isc_result_t
isc_logconfig_use(isc_log_t *lctx, isc_logconfig_t *lcfg) {
isc_logconfig_t *old_cfg;
isc_result_t result;
REQUIRE(VALID_CONTEXT(lctx));
REQUIRE(VALID_CONFIG(lcfg));
REQUIRE(lcfg->lctx == lctx);
/*
* Ensure that lcfg->channellist_count == lctx->category_count.
* They won't be equal if isc_log_usechannel has not been called
* since any call to isc_log_registercategories.
*/
result = sync_channellist(lcfg);
if (result != ISC_R_SUCCESS)
return (result);
LOCK(&lctx->lock);
old_cfg = lctx->logconfig;
lctx->logconfig = lcfg;
UNLOCK(&lctx->lock);
isc_logconfig_destroy(&old_cfg);
return (ISC_R_SUCCESS);
}
void
isc_log_destroy(isc_log_t **lctxp) {
isc_log_t *lctx;
isc_logconfig_t *lcfg;
isc_mem_t *mctx;
isc_logmessage_t *message;
REQUIRE(lctxp != NULL && VALID_CONTEXT(*lctxp));
lctx = *lctxp;
mctx = lctx->mctx;
if (lctx->logconfig != NULL) {
lcfg = lctx->logconfig;
lctx->logconfig = NULL;
isc_logconfig_destroy(&lcfg);
}
DESTROYLOCK(&lctx->lock);
while ((message = ISC_LIST_HEAD(lctx->messages)) != NULL) {
ISC_LIST_UNLINK(lctx->messages, message, link);
isc_mem_put(mctx, message,
sizeof(*message) + strlen(message->text) + 1);
}
lctx->buffer[0] = '\0';
lctx->debug_level = 0;
lctx->categories = NULL;
lctx->category_count = 0;
lctx->modules = NULL;
lctx->module_count = 0;
lctx->mctx = NULL;
lctx->magic = 0;
isc_mem_put(mctx, lctx, sizeof(*lctx));
*lctxp = NULL;
}
void
isc_logconfig_destroy(isc_logconfig_t **lcfgp) {
isc_logconfig_t *lcfg;
isc_mem_t *mctx;
isc_logchannel_t *channel;
isc_logchannellist_t *item;
char *filename;
unsigned int i;
REQUIRE(lcfgp != NULL && VALID_CONFIG(*lcfgp));
lcfg = *lcfgp;
/*
* This function cannot be called with a logconfig that is in
* use by a log context.
*/
REQUIRE(lcfg->lctx != NULL && lcfg->lctx->logconfig != lcfg);
mctx = lcfg->lctx->mctx;
while ((channel = ISC_LIST_HEAD(lcfg->channels)) != NULL) {
ISC_LIST_UNLINK(lcfg->channels, channel, link);
if (channel->type == ISC_LOG_TOFILE) {
/*
* The filename for the channel may have ultimately
* started its life in user-land as a const string,
* but in isc_log_createchannel it gets copied
* into writable memory and is not longer truly const.
*/
DE_CONST(FILE_NAME(channel), filename);
isc_mem_free(mctx, filename);
if (FILE_STREAM(channel) != NULL)
(void)fclose(FILE_STREAM(channel));
}
isc_mem_free(mctx, channel->name);
isc_mem_put(mctx, channel, sizeof(*channel));
}
for (i = 0; i < lcfg->channellist_count; i++)
while ((item = ISC_LIST_HEAD(lcfg->channellists[i])) != NULL) {
ISC_LIST_UNLINK(lcfg->channellists[i], item, link);
isc_mem_put(mctx, item, sizeof(*item));
}
if (lcfg->channellist_count > 0)
isc_mem_put(mctx, lcfg->channellists,
lcfg->channellist_count *
sizeof(ISC_LIST(isc_logchannellist_t)));
lcfg->dynamic = ISC_FALSE;
if (lcfg->tag != NULL)
isc_mem_free(lcfg->lctx->mctx, lcfg->tag);
lcfg->tag = NULL;
lcfg->highest_level = 0;
lcfg->duplicate_interval = 0;
lcfg->magic = 0;
isc_mem_put(mctx, lcfg, sizeof(*lcfg));
*lcfgp = NULL;
}
void
isc_log_registercategories(isc_log_t *lctx, isc_logcategory_t categories[]) {
isc_logcategory_t *catp;
REQUIRE(VALID_CONTEXT(lctx));
REQUIRE(categories != NULL && categories[0].name != NULL);
/*
* XXXDCL This somewhat sleazy situation of using the last pointer
* in one category array to point to the next array exists because
* this registration function returns void and I didn't want to have
* change everything that used it by making it return an isc_result_t.
* It would need to do that if it had to allocate memory to store
* pointers to each array passed in.
*/
if (lctx->categories == NULL)
lctx->categories = categories;
else {
/*
* Adjust the last (NULL) pointer of the already registered
* categories to point to the incoming array.
*/
for (catp = lctx->categories; catp->name != NULL; )
if (catp->id == UINT_MAX)
/*
* The name pointer points to the next array.
* Ick.
*/
DE_CONST(catp->name, catp);
else
catp++;
catp->name = (void *)categories;
catp->id = UINT_MAX;
}
/*
* Update the id number of the category with its new global id.
*/
for (catp = categories; catp->name != NULL; catp++)
catp->id = lctx->category_count++;
}
isc_logcategory_t *
isc_log_categorybyname(isc_log_t *lctx, const char *name) {
isc_logcategory_t *catp;
REQUIRE(VALID_CONTEXT(lctx));
REQUIRE(name != NULL);
for (catp = lctx->categories; catp->name != NULL; )
if (catp->id == UINT_MAX)
/*
* catp is neither modified nor returned to the
* caller, so removing its const qualifier is ok.
*/
DE_CONST(catp->name, catp);
else {
if (strcmp(catp->name, name) == 0)
return (catp);
catp++;
}
return (NULL);
}
void
isc_log_registermodules(isc_log_t *lctx, isc_logmodule_t modules[]) {
isc_logmodule_t *modp;
REQUIRE(VALID_CONTEXT(lctx));
REQUIRE(modules != NULL && modules[0].name != NULL);
/*
* XXXDCL This somewhat sleazy situation of using the last pointer
* in one category array to point to the next array exists because
* this registration function returns void and I didn't want to have
* change everything that used it by making it return an isc_result_t.
* It would need to do that if it had to allocate memory to store
* pointers to each array passed in.
*/
if (lctx->modules == NULL)
lctx->modules = modules;
else {
/*
* Adjust the last (NULL) pointer of the already registered
* modules to point to the incoming array.
*/
for (modp = lctx->modules; modp->name != NULL; )
if (modp->id == UINT_MAX)
/*
* The name pointer points to the next array.
* Ick.
*/
DE_CONST(modp->name, modp);
else
modp++;
modp->name = (void *)modules;
modp->id = UINT_MAX;
}
/*
* Update the id number of the module with its new global id.
*/
for (modp = modules; modp->name != NULL; modp++)
modp->id = lctx->module_count++;
}
isc_logmodule_t *
isc_log_modulebyname(isc_log_t *lctx, const char *name) {
isc_logmodule_t *modp;
REQUIRE(VALID_CONTEXT(lctx));
REQUIRE(name != NULL);
for (modp = lctx->modules; modp->name != NULL; )
if (modp->id == UINT_MAX)
/*
* modp is neither modified nor returned to the
* caller, so removing its const qualifier is ok.
*/
DE_CONST(modp->name, modp);
else {
if (strcmp(modp->name, name) == 0)
return (modp);
modp++;
}
return (NULL);
}
isc_result_t
isc_log_createchannel(isc_logconfig_t *lcfg, const char *name,
unsigned int type, int level,
const isc_logdestination_t *destination,
unsigned int flags)
{
isc_logchannel_t *channel;
isc_mem_t *mctx;
REQUIRE(VALID_CONFIG(lcfg));
REQUIRE(name != NULL);
REQUIRE(type == ISC_LOG_TOSYSLOG || type == ISC_LOG_TOFILE ||
type == ISC_LOG_TOFILEDESC || type == ISC_LOG_TONULL);
REQUIRE(destination != NULL || type == ISC_LOG_TONULL);
REQUIRE(level >= ISC_LOG_CRITICAL);
REQUIRE((flags &
(unsigned int)~(ISC_LOG_PRINTALL | ISC_LOG_DEBUGONLY)) == 0);
/* XXXDCL find duplicate names? */
mctx = lcfg->lctx->mctx;
channel = isc_mem_get(mctx, sizeof(*channel));
if (channel == NULL)
return (ISC_R_NOMEMORY);
channel->name = isc_mem_strdup(mctx, name);
if (channel->name == NULL) {
isc_mem_put(mctx, channel, sizeof(*channel));
return (ISC_R_NOMEMORY);
}
channel->type = type;
channel->level = level;
channel->flags = flags;
ISC_LINK_INIT(channel, link);
switch (type) {
case ISC_LOG_TOSYSLOG:
FACILITY(channel) = destination->facility;
break;
case ISC_LOG_TOFILE:
/*
* The file name is copied because greatest_version wants
* to scribble on it, so it needs to be definitely in
* writable memory.
*/
FILE_NAME(channel) =
isc_mem_strdup(mctx, destination->file.name);
FILE_STREAM(channel) = NULL;
FILE_VERSIONS(channel) = destination->file.versions;
FILE_MAXSIZE(channel) = destination->file.maximum_size;
FILE_MAXREACHED(channel) = ISC_FALSE;
break;
case ISC_LOG_TOFILEDESC:
FILE_NAME(channel) = NULL;
FILE_STREAM(channel) = destination->file.stream;
FILE_MAXSIZE(channel) = 0;
FILE_VERSIONS(channel) = ISC_LOG_ROLLNEVER;
break;
case ISC_LOG_TONULL:
/* Nothing. */
break;
default:
isc_mem_put(mctx, channel->name, strlen(channel->name) + 1);
isc_mem_put(mctx, channel, sizeof(*channel));
return (ISC_R_UNEXPECTED);
}
ISC_LIST_PREPEND(lcfg->channels, channel, link);
/*
* If default_stderr was redefined, make the default category
* point to the new default_stderr.
*/
if (strcmp(name, "default_stderr") == 0)
default_channel.channel = channel;
return (ISC_R_SUCCESS);
}
isc_result_t
isc_log_usechannel(isc_logconfig_t *lcfg, const char *name,
const isc_logcategory_t *category,
const isc_logmodule_t *module)
{
isc_log_t *lctx;
isc_logchannel_t *channel;
isc_result_t result = ISC_R_SUCCESS;
unsigned int i;
REQUIRE(VALID_CONFIG(lcfg));
REQUIRE(name != NULL);
lctx = lcfg->lctx;
REQUIRE(category == NULL || category->id < lctx->category_count);
REQUIRE(module == NULL || module->id < lctx->module_count);
for (channel = ISC_LIST_HEAD(lcfg->channels); channel != NULL;
channel = ISC_LIST_NEXT(channel, link))
if (strcmp(name, channel->name) == 0)
break;
if (channel == NULL)
return (ISC_R_NOTFOUND);
if (category != NULL)
result = assignchannel(lcfg, category->id, module, channel);
else
/*
* Assign to all categories. Note that this includes
* the default channel.
*/
for (i = 0; i < lctx->category_count; i++) {
result = assignchannel(lcfg, i, module, channel);
if (result != ISC_R_SUCCESS)
break;
}
return (result);
}
void
isc_log_write(isc_log_t *lctx, isc_logcategory_t *category,
isc_logmodule_t *module, int level, const char *format, ...)
{
va_list args;
/*
* Contract checking is done in isc_log_doit().
*/
va_start(args, format);
isc_log_doit(lctx, category, module, level, ISC_FALSE,
NULL, 0, 0, format, args);
va_end(args);
}
void
isc_log_vwrite(isc_log_t *lctx, isc_logcategory_t *category,
isc_logmodule_t *module, int level,
const char *format, va_list args)
{
/*
* Contract checking is done in isc_log_doit().
*/
isc_log_doit(lctx, category, module, level, ISC_FALSE,
NULL, 0, 0, format, args);
}
void
isc_log_write1(isc_log_t *lctx, isc_logcategory_t *category,
isc_logmodule_t *module, int level, const char *format, ...)
{
va_list args;
/*
* Contract checking is done in isc_log_doit().
*/
va_start(args, format);
isc_log_doit(lctx, category, module, level, ISC_TRUE,
NULL, 0, 0, format, args);
va_end(args);
}
void
isc_log_vwrite1(isc_log_t *lctx, isc_logcategory_t *category,
isc_logmodule_t *module, int level,
const char *format, va_list args)
{
/*
* Contract checking is done in isc_log_doit().
*/
isc_log_doit(lctx, category, module, level, ISC_TRUE,
NULL, 0, 0, format, args);
}
void
isc_log_iwrite(isc_log_t *lctx, isc_logcategory_t *category,
isc_logmodule_t *module, int level,
isc_msgcat_t *msgcat, int msgset, int msg,
const char *format, ...)
{
va_list args;
/*
* Contract checking is done in isc_log_doit().
*/
va_start(args, format);
isc_log_doit(lctx, category, module, level, ISC_FALSE,
msgcat, msgset, msg, format, args);
va_end(args);
}
void
isc_log_ivwrite(isc_log_t *lctx, isc_logcategory_t *category,
isc_logmodule_t *module, int level,
isc_msgcat_t *msgcat, int msgset, int msg,
const char *format, va_list args)
{
/*
* Contract checking is done in isc_log_doit().
*/
isc_log_doit(lctx, category, module, level, ISC_FALSE,
msgcat, msgset, msg, format, args);
}
void
isc_log_iwrite1(isc_log_t *lctx, isc_logcategory_t *category,
isc_logmodule_t *module, int level,
isc_msgcat_t *msgcat, int msgset, int msg,
const char *format, ...)
{
va_list args;
/*
* Contract checking is done in isc_log_doit().
*/
va_start(args, format);
isc_log_doit(lctx, category, module, level, ISC_TRUE,
msgcat, msgset, msg, format, args);
va_end(args);
}
void
isc_log_ivwrite1(isc_log_t *lctx, isc_logcategory_t *category,
isc_logmodule_t *module, int level,
isc_msgcat_t *msgcat, int msgset, int msg,
const char *format, va_list args)
{
/*
* Contract checking is done in isc_log_doit().
*/
isc_log_doit(lctx, category, module, level, ISC_TRUE,
msgcat, msgset, msg, format, args);
}
void
isc_log_setcontext(isc_log_t *lctx) {
isc_lctx = lctx;
}
void
isc_log_setdebuglevel(isc_log_t *lctx, unsigned int level) {
isc_logchannel_t *channel;
REQUIRE(VALID_CONTEXT(lctx));
LOCK(&lctx->lock);
lctx->debug_level = level;
/*
* Close ISC_LOG_DEBUGONLY channels if level is zero.
*/
if (lctx->debug_level == 0)
for (channel = ISC_LIST_HEAD(lctx->logconfig->channels);
channel != NULL;
channel = ISC_LIST_NEXT(channel, link))
if (channel->type == ISC_LOG_TOFILE &&
(channel->flags & ISC_LOG_DEBUGONLY) != 0 &&
FILE_STREAM(channel) != NULL) {
(void)fclose(FILE_STREAM(channel));
FILE_STREAM(channel) = NULL;
}
UNLOCK(&lctx->lock);
}
unsigned int
isc_log_getdebuglevel(isc_log_t *lctx) {
REQUIRE(VALID_CONTEXT(lctx));
return (lctx->debug_level);
}
void
isc_log_setduplicateinterval(isc_logconfig_t *lcfg, unsigned int interval) {
REQUIRE(VALID_CONFIG(lcfg));
lcfg->duplicate_interval = interval;
}
unsigned int
isc_log_getduplicateinterval(isc_logconfig_t *lcfg) {
REQUIRE(VALID_CONTEXT(lcfg));
return (lcfg->duplicate_interval);
}
isc_result_t
isc_log_settag(isc_logconfig_t *lcfg, const char *tag) {
REQUIRE(VALID_CONFIG(lcfg));
if (tag != NULL && *tag != '\0') {
if (lcfg->tag != NULL)
isc_mem_free(lcfg->lctx->mctx, lcfg->tag);
lcfg->tag = isc_mem_strdup(lcfg->lctx->mctx, tag);
if (lcfg->tag == NULL)
return (ISC_R_NOMEMORY);
} else {
if (lcfg->tag != NULL)
isc_mem_free(lcfg->lctx->mctx, lcfg->tag);
lcfg->tag = NULL;
}
return (ISC_R_SUCCESS);
}
char *
isc_log_gettag(isc_logconfig_t *lcfg) {
REQUIRE(VALID_CONFIG(lcfg));
return (lcfg->tag);
}
/* XXXDCL NT -- This interface will assuredly be changing. */
void
isc_log_opensyslog(const char *tag, int options, int facility) {
(void)openlog(tag, options, facility);
}
void
isc_log_closefilelogs(isc_log_t *lctx) {
isc_logchannel_t *channel;
REQUIRE(VALID_CONTEXT(lctx));
LOCK(&lctx->lock);
for (channel = ISC_LIST_HEAD(lctx->logconfig->channels);
channel != NULL;
channel = ISC_LIST_NEXT(channel, link))
if (channel->type == ISC_LOG_TOFILE &&
FILE_STREAM(channel) != NULL) {
(void)fclose(FILE_STREAM(channel));
FILE_STREAM(channel) = NULL;
}
UNLOCK(&lctx->lock);
}
/****
**** Internal functions
****/
static isc_result_t
assignchannel(isc_logconfig_t *lcfg, unsigned int category_id,
const isc_logmodule_t *module, isc_logchannel_t *channel)
{
isc_logchannellist_t *new_item;
isc_log_t *lctx;
isc_result_t result;
REQUIRE(VALID_CONFIG(lcfg));
lctx = lcfg->lctx;
REQUIRE(category_id < lctx->category_count);
REQUIRE(module == NULL || module->id < lctx->module_count);
REQUIRE(channel != NULL);
/*
* Ensure lcfg->channellist_count == lctx->category_count.
*/
result = sync_channellist(lcfg);
if (result != ISC_R_SUCCESS)
return (result);
new_item = isc_mem_get(lctx->mctx, sizeof(*new_item));
if (new_item == NULL)
return (ISC_R_NOMEMORY);
new_item->channel = channel;
new_item->module = module;
ISC_LIST_INITANDPREPEND(lcfg->channellists[category_id],
new_item, link);
/*
* Remember the highest logging level set by any channel in the
* logging config, so isc_log_doit() can quickly return if the
* message is too high to be logged by any channel.
*/
if (channel->type != ISC_LOG_TONULL) {
if (lcfg->highest_level < channel->level)
lcfg->highest_level = channel->level;
if (channel->level == ISC_LOG_DYNAMIC)
lcfg->dynamic = ISC_TRUE;
}
return (ISC_R_SUCCESS);
}
/*
* This would ideally be part of isc_log_registercategories(), except then
* that function would have to return isc_result_t instead of void.
*/
static isc_result_t
sync_channellist(isc_logconfig_t *lcfg) {
unsigned int bytes;
isc_log_t *lctx;
void *lists;
REQUIRE(VALID_CONFIG(lcfg));
lctx = lcfg->lctx;
REQUIRE(lctx->category_count != 0);
if (lctx->category_count == lcfg->channellist_count)
return (ISC_R_SUCCESS);
bytes = lctx->category_count * sizeof(ISC_LIST(isc_logchannellist_t));
lists = isc_mem_get(lctx->mctx, bytes);
if (lists == NULL)
return (ISC_R_NOMEMORY);
memset(lists, 0, bytes);
if (lcfg->channellist_count != 0) {
bytes = lcfg->channellist_count *
sizeof(ISC_LIST(isc_logchannellist_t));
memcpy(lists, lcfg->channellists, bytes);
isc_mem_put(lctx->mctx, lcfg->channellists, bytes);
}
lcfg->channellists = lists;
lcfg->channellist_count = lctx->category_count;
return (ISC_R_SUCCESS);
}
static isc_result_t
greatest_version(isc_logchannel_t *channel, int *greatestp) {
/* XXXDCL HIGHLY NT */
char *basename, *digit_end;
const char *dirname;
int version, greatest = -1;
unsigned int basenamelen;
isc_dir_t dir;
isc_result_t result;
char sep = '/';
#ifdef _WIN32
char *basename2;
#endif
REQUIRE(channel->type == ISC_LOG_TOFILE);
/*
* It is safe to DE_CONST the file.name because it was copied
* with isc_mem_strdup in isc_log_createchannel.
*/
basename = strrchr(FILE_NAME(channel), sep);
#ifdef _WIN32
basename2 = strrchr(FILE_NAME(channel), '\\');
if ((basename != NULL && basename2 != NULL && basename2 > basename) ||
(basename == NULL && basename2 != NULL)) {
basename = basename2;
sep = '\\';
}
#endif
if (basename != NULL) {
*basename++ = '\0';
dirname = FILE_NAME(channel);
} else {
DE_CONST(FILE_NAME(channel), basename);
dirname = ".";
}
basenamelen = strlen(basename);
isc_dir_init(&dir);
result = isc_dir_open(&dir, dirname);
/*
* Replace the file separator if it was taken out.
*/
if (basename != FILE_NAME(channel))
*(basename - 1) = sep;
/*
* Return if the directory open failed.
*/
if (result != ISC_R_SUCCESS)
return (result);
while (isc_dir_read(&dir) == ISC_R_SUCCESS) {
if (dir.entry.length > basenamelen &&
strncmp(dir.entry.name, basename, basenamelen) == 0 &&
dir.entry.name[basenamelen] == '.') {
version = strtol(&dir.entry.name[basenamelen + 1],
&digit_end, 10);
if (*digit_end == '\0' && version > greatest)
greatest = version;
}
}
isc_dir_close(&dir);
*greatestp = ++greatest;
return (ISC_R_SUCCESS);
}
static isc_result_t
roll_log(isc_logchannel_t *channel) {
int i, n, greatest;
char current[PATH_MAX + 1];
char new[PATH_MAX + 1];
const char *path;
isc_result_t result;
/*
* Do nothing (not even excess version trimming) if ISC_LOG_ROLLNEVER
* is specified. Apparently complete external control over the log
* files is desired.
*/
if (FILE_VERSIONS(channel) == ISC_LOG_ROLLNEVER)
return (ISC_R_SUCCESS);
path = FILE_NAME(channel);
/*
* Set greatest_version to the greatest existing version
* (not the maximum requested version). This is 1 based even
* though the file names are 0 based, so an oldest log of log.1
* is a greatest_version of 2.
*/
result = greatest_version(channel, &greatest);
if (result != ISC_R_SUCCESS)
return (result);
/*
* Now greatest should be set to the highest version number desired.
* Since the highest number is one less than FILE_VERSIONS(channel)
* when not doing infinite log rolling, greatest will need to be
* decremented when it is equal to -- or greater than --
* FILE_VERSIONS(channel). When greatest is less than
* FILE_VERSIONS(channel), it is already suitable for use as
* the maximum version number.
*/
if (FILE_VERSIONS(channel) == ISC_LOG_ROLLINFINITE ||
FILE_VERSIONS(channel) > greatest)
; /* Do nothing. */
else
/*
* When greatest is >= FILE_VERSIONS(channel), it needs to
* be reduced until it is FILE_VERSIONS(channel) - 1.
* Remove any excess logs on the way to that value.
*/
while (--greatest >= FILE_VERSIONS(channel)) {
n = snprintf(current, sizeof(current), "%s.%d",
path, greatest);
if (n >= (int)sizeof(current) || n < 0)
result = ISC_R_NOSPACE;
else
result = isc_file_remove(current);
if (result != ISC_R_SUCCESS &&
result != ISC_R_FILENOTFOUND)
syslog(LOG_ERR,
"unable to remove log file '%s.%d': %s",
path, greatest,
isc_result_totext(result));
}
for (i = greatest; i > 0; i--) {
result = ISC_R_SUCCESS;
n = snprintf(current, sizeof(current), "%s.%d", path, i - 1);
if (n >= (int)sizeof(current) || n < 0)
result = ISC_R_NOSPACE;
if (result == ISC_R_SUCCESS) {
n = snprintf(new, sizeof(new), "%s.%d", path, i);
if (n >= (int)sizeof(new) || n < 0)
result = ISC_R_NOSPACE;
}
if (result == ISC_R_SUCCESS)
result = isc_file_rename(current, new);
if (result != ISC_R_SUCCESS &&
result != ISC_R_FILENOTFOUND)
syslog(LOG_ERR,
"unable to rename log file '%s.%d' to "
"'%s.%d': %s", path, i - 1, path, i,
isc_result_totext(result));
}
if (FILE_VERSIONS(channel) != 0) {
n = snprintf(new, sizeof(new), "%s.0", path);
if (n >= (int)sizeof(new) || n < 0)
result = ISC_R_NOSPACE;
else
result = isc_file_rename(path, new);
if (result != ISC_R_SUCCESS &&
result != ISC_R_FILENOTFOUND)
syslog(LOG_ERR,
"unable to rename log file '%s' to '%s.0': %s",
path, path, isc_result_totext(result));
} else {
result = isc_file_remove(path);
if (result != ISC_R_SUCCESS &&
result != ISC_R_FILENOTFOUND)
syslog(LOG_ERR, "unable to remove log file '%s': %s",
path, isc_result_totext(result));
}
return (ISC_R_SUCCESS);
}
static isc_result_t
isc_log_open(isc_logchannel_t *channel) {
struct stat statbuf;
isc_boolean_t regular_file;
isc_boolean_t roll = ISC_FALSE;
isc_result_t result = ISC_R_SUCCESS;
const char *path;
REQUIRE(channel->type == ISC_LOG_TOFILE);
REQUIRE(FILE_STREAM(channel) == NULL);
path = FILE_NAME(channel);
REQUIRE(path != NULL && *path != '\0');
/*
* Determine type of file; only regular files will be
* version renamed, and only if the base file exists
* and either has no size limit or has reached its size limit.
*/
if (stat(path, &statbuf) == 0) {
regular_file = S_ISREG(statbuf.st_mode) ? ISC_TRUE : ISC_FALSE;
/* XXXDCL if not regular_file complain? */
if ((FILE_MAXSIZE(channel) == 0 &&
FILE_VERSIONS(channel) != ISC_LOG_ROLLNEVER) ||
(FILE_MAXSIZE(channel) > 0 &&
statbuf.st_size >= FILE_MAXSIZE(channel)))
roll = regular_file;
} else if (errno == ENOENT)
regular_file = ISC_TRUE;
else
result = ISC_R_INVALIDFILE;
/*
* Version control.
*/
if (result == ISC_R_SUCCESS && roll) {
if (FILE_VERSIONS(channel) == ISC_LOG_ROLLNEVER)
return (ISC_R_MAXSIZE);
result = roll_log(channel);
if (result != ISC_R_SUCCESS) {
if ((channel->flags & ISC_LOG_OPENERR) == 0) {
syslog(LOG_ERR,
"isc_log_open: roll_log '%s' "
"failed: %s",
FILE_NAME(channel),
isc_result_totext(result));
channel->flags |= ISC_LOG_OPENERR;
}
return (result);
}
}
result = isc_stdio_open(path, "a", &FILE_STREAM(channel));
return (result);
}
isc_boolean_t
isc_log_wouldlog(isc_log_t *lctx, int level) {
/*
* Try to avoid locking the mutex for messages which can't
* possibly be logged to any channels -- primarily debugging
* messages that the debug level is not high enough to print.
*
* If the level is (mathematically) less than or equal to the
* highest_level, or if there is a dynamic channel and the level is
* less than or equal to the debug level, the main loop must be
* entered to see if the message should really be output.
*
* NOTE: this is UNLOCKED access to the logconfig. However,
* the worst thing that can happen is that a bad decision is made
* about returning without logging, and that's not a big concern,
* because that's a risk anyway if the logconfig is being
* dynamically changed.
*/
if (lctx == NULL || lctx->logconfig == NULL)
return (ISC_FALSE);
return (ISC_TF(level <= lctx->logconfig->highest_level ||
(lctx->logconfig->dynamic &&
level <= lctx->debug_level)));
}
static void
isc_log_doit(isc_log_t *lctx, isc_logcategory_t *category,
isc_logmodule_t *module, int level, isc_boolean_t write_once,
isc_msgcat_t *msgcat, int msgset, int msg,
const char *format, va_list args)
{
int syslog_level;
char time_string[64];
char level_string[24];
const char *iformat;
struct stat statbuf;
isc_boolean_t matched = ISC_FALSE;
isc_boolean_t printtime, printtag;
isc_boolean_t printcategory, printmodule, printlevel;
isc_logconfig_t *lcfg;
isc_logchannel_t *channel;
isc_logchannellist_t *category_channels;
isc_result_t result;
REQUIRE(lctx == NULL || VALID_CONTEXT(lctx));
REQUIRE(category != NULL);
REQUIRE(module != NULL);
REQUIRE(level != ISC_LOG_DYNAMIC);
REQUIRE(format != NULL);
/*
* Programs can use libraries that use this logging code without
* wanting to do any logging, thus the log context is allowed to
* be non-existent.
*/
if (lctx == NULL)
return;
REQUIRE(category->id < lctx->category_count);
REQUIRE(module->id < lctx->module_count);
if (! isc_log_wouldlog(lctx, level))
return;
if (msgcat != NULL)
iformat = isc_msgcat_get(msgcat, msgset, msg, format);
else
iformat = format;
time_string[0] = '\0';
level_string[0] = '\0';
LOCK(&lctx->lock);
lctx->buffer[0] = '\0';
lcfg = lctx->logconfig;
category_channels = ISC_LIST_HEAD(lcfg->channellists[category->id]);
/*
* XXXDCL add duplicate filtering? (To not write multiple times to
* the same source via various channels).
*/
do {
/*
* If the channel list end was reached and a match was made,
* everything is finished.
*/
if (category_channels == NULL && matched)
break;
if (category_channels == NULL && ! matched &&
category_channels != ISC_LIST_HEAD(lcfg->channellists[0]))
/*
* No category/module pair was explicitly configured.
* Try the category named "default".
*/
category_channels =
ISC_LIST_HEAD(lcfg->channellists[0]);
if (category_channels == NULL && ! matched)
/*
* No matching module was explicitly configured
* for the category named "default". Use the internal
* default channel.
*/
category_channels = &default_channel;
if (category_channels->module != NULL &&
category_channels->module != module) {
category_channels = ISC_LIST_NEXT(category_channels,
link);
continue;
}
matched = ISC_TRUE;
channel = category_channels->channel;
category_channels = ISC_LIST_NEXT(category_channels, link);
if (((channel->flags & ISC_LOG_DEBUGONLY) != 0) &&
lctx->debug_level == 0)
continue;
if (channel->level == ISC_LOG_DYNAMIC) {
if (lctx->debug_level < level)
continue;
} else if (channel->level < level)
continue;
if ((channel->flags & ISC_LOG_PRINTTIME) != 0 &&
time_string[0] == '\0') {
isc_time_t isctime;
TIME_NOW(&isctime);
isc_time_formattimestamp(&isctime, time_string,
sizeof(time_string));
}
if ((channel->flags & ISC_LOG_PRINTLEVEL) != 0 &&
level_string[0] == '\0') {
if (level < ISC_LOG_CRITICAL)
snprintf(level_string, sizeof(level_string),
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_LOG,
ISC_MSG_LEVEL,
"level %d: "),
level);
else if (level > ISC_LOG_DYNAMIC)
snprintf(level_string, sizeof(level_string),
"%s %d: ", log_level_strings[0],
level);
else
snprintf(level_string, sizeof(level_string),
"%s: ", log_level_strings[-level]);
}
/*
* Only format the message once.
*/
if (lctx->buffer[0] == '\0') {
(void)vsnprintf(lctx->buffer, sizeof(lctx->buffer),
iformat, args);
/*
* Check for duplicates.
*/
if (write_once) {
isc_logmessage_t *message, *new;
isc_time_t oldest;
isc_interval_t interval;
isc_interval_set(&interval,
lcfg->duplicate_interval, 0);
/*
* 'oldest' is the age of the oldest messages
* which fall within the duplicate_interval
* range.
*/
TIME_NOW(&oldest);
if (isc_time_subtract(&oldest, &interval, &oldest)
!= ISC_R_SUCCESS)
/*
* Can't effectively do the checking
* without having a valid time.
*/
message = NULL;
else
message =ISC_LIST_HEAD(lctx->messages);
while (message != NULL) {
if (isc_time_compare(&message->time,
&oldest) < 0) {
/*
* This message is older
* than the duplicate_interval,
* so it should be dropped from
* the history.
*
* Setting the interval to be
* to be longer will obviously
* not cause the expired
* message to spring back into
* existence.
*/
new = ISC_LIST_NEXT(message,
link);
ISC_LIST_UNLINK(lctx->messages,
message, link);
isc_mem_put(lctx->mctx,
message,
sizeof(*message) + 1 +
strlen(message->text));
message = new;
continue;
}
/*
* This message is in the duplicate
* filtering interval ...
*/
if (strcmp(lctx->buffer, message->text)
== 0) {
/*
* ... and it is a duplicate.
* Unlock the mutex and
* get the hell out of Dodge.
*/
UNLOCK(&lctx->lock);
return;
}
message = ISC_LIST_NEXT(message, link);
}
/*
* It wasn't in the duplicate interval,
* so add it to the message list.
*/
new = isc_mem_get(lctx->mctx,
sizeof(isc_logmessage_t) +
strlen(lctx->buffer) + 1);
if (new != NULL) {
/*
* Put the text immediately after
* the struct. The strcpy is safe.
*/
new->text = (char *)(new + 1);
strcpy(new->text, lctx->buffer);
TIME_NOW(&new->time);
ISC_LIST_APPEND(lctx->messages,
new, link);
}
}
}
printtime = ISC_TF((channel->flags & ISC_LOG_PRINTTIME)
!= 0);
printtag = ISC_TF((channel->flags & ISC_LOG_PRINTTAG)
!= 0 && lcfg->tag != NULL);
printcategory = ISC_TF((channel->flags & ISC_LOG_PRINTCATEGORY)
!= 0);
printmodule = ISC_TF((channel->flags & ISC_LOG_PRINTMODULE)
!= 0);
printlevel = ISC_TF((channel->flags & ISC_LOG_PRINTLEVEL)
!= 0);
switch (channel->type) {
case ISC_LOG_TOFILE:
if (FILE_MAXREACHED(channel)) {
/*
* If the file can be rolled, OR
* If the file no longer exists, OR
* If the file is less than the maximum size,
* (such as if it had been renamed and
* a new one touched, or it was truncated
* in place)
* ... then close it to trigger reopening.
*/
if (FILE_VERSIONS(channel) !=
ISC_LOG_ROLLNEVER ||
(stat(FILE_NAME(channel), &statbuf) != 0 &&
errno == ENOENT) ||
statbuf.st_size < FILE_MAXSIZE(channel)) {
(void)fclose(FILE_STREAM(channel));
FILE_STREAM(channel) = NULL;
FILE_MAXREACHED(channel) = ISC_FALSE;
} else
/*
* Eh, skip it.
*/
break;
}
if (FILE_STREAM(channel) == NULL) {
result = isc_log_open(channel);
if (result != ISC_R_SUCCESS &&
result != ISC_R_MAXSIZE &&
(channel->flags & ISC_LOG_OPENERR) == 0) {
syslog(LOG_ERR,
"isc_log_open '%s' failed: %s",
FILE_NAME(channel),
isc_result_totext(result));
channel->flags |= ISC_LOG_OPENERR;
}
if (result != ISC_R_SUCCESS)
break;
channel->flags &= ~ISC_LOG_OPENERR;
}
/* FALLTHROUGH */
case ISC_LOG_TOFILEDESC:
fprintf(FILE_STREAM(channel), "%s%s%s%s%s%s%s%s%s%s\n",
printtime ? time_string : "",
printtime ? " " : "",
printtag ? lcfg->tag : "",
printtag ? ": " : "",
printcategory ? category->name : "",
printcategory ? ": " : "",
printmodule ? (module != NULL ? module->name
: "no_module")
: "",
printmodule ? ": " : "",
printlevel ? level_string : "",
lctx->buffer);
fflush(FILE_STREAM(channel));
/*
* If the file now exceeds its maximum size
* threshold, note it so that it will not be logged
* to any more.
*/
if (FILE_MAXSIZE(channel) > 0) {
INSIST(channel->type == ISC_LOG_TOFILE);
/* XXXDCL NT fstat/fileno */
/* XXXDCL complain if fstat fails? */
if (fstat(fileno(FILE_STREAM(channel)),
&statbuf) >= 0 &&
statbuf.st_size > FILE_MAXSIZE(channel))
FILE_MAXREACHED(channel) = ISC_TRUE;
}
break;
case ISC_LOG_TOSYSLOG:
if (level > 0)
syslog_level = LOG_DEBUG;
else if (level < ISC_LOG_CRITICAL)
syslog_level = LOG_CRIT;
else
syslog_level = syslog_map[-level];
(void)syslog(FACILITY(channel) | syslog_level,
"%s%s%s%s%s%s%s%s%s%s",
printtime ? time_string : "",
printtime ? " " : "",
printtag ? lcfg->tag : "",
printtag ? ": " : "",
printcategory ? category->name : "",
printcategory ? ": " : "",
printmodule ? (module != NULL ? module->name
: "no_module")
: "",
printmodule ? ": " : "",
printlevel ? level_string : "",
lctx->buffer);
break;
case ISC_LOG_TONULL:
break;
}
} while (1);
UNLOCK(&lctx->lock);
}
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