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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 16:28:20 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 16:28:20 +0000 |
commit | dcc721a95bef6f0d8e6d8775b8efe33e5aecd562 (patch) | |
tree | 66a2774cd0ee294d019efd71d2544c70f42b2842 /contrib/imkmsg | |
parent | Initial commit. (diff) | |
download | rsyslog-dcc721a95bef6f0d8e6d8775b8efe33e5aecd562.tar.xz rsyslog-dcc721a95bef6f0d8e6d8775b8efe33e5aecd562.zip |
Adding upstream version 8.2402.0.upstream/8.2402.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | contrib/imkmsg/Makefile.am | 8 | ||||
-rw-r--r-- | contrib/imkmsg/Makefile.in | 807 | ||||
-rw-r--r-- | contrib/imkmsg/imkmsg.c | 372 | ||||
-rw-r--r-- | contrib/imkmsg/imkmsg.h | 78 | ||||
-rw-r--r-- | contrib/imkmsg/kmsg.c | 327 |
5 files changed, 1592 insertions, 0 deletions
diff --git a/contrib/imkmsg/Makefile.am b/contrib/imkmsg/Makefile.am new file mode 100644 index 0000000..87c177d --- /dev/null +++ b/contrib/imkmsg/Makefile.am @@ -0,0 +1,8 @@ +pkglib_LTLIBRARIES = imkmsg.la +imkmsg_la_SOURCES = imkmsg.c imkmsg.h + +imkmsg_la_SOURCES += kmsg.c + +imkmsg_la_CPPFLAGS = -I$(top_srcdir) $(PTHREADS_CFLAGS) $(RSRT_CFLAGS) +imkmsg_la_LDFLAGS = -module -avoid-version +imkmsg_la_LIBADD = diff --git a/contrib/imkmsg/Makefile.in b/contrib/imkmsg/Makefile.in new file mode 100644 index 0000000..e58e4ff --- /dev/null +++ b/contrib/imkmsg/Makefile.in @@ -0,0 +1,807 @@ +# Makefile.in generated by automake 1.16.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2018 Free Software Foundation, Inc. + +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +VPATH = @srcdir@ +am__is_gnu_make = { \ + if test -z '$(MAKELEVEL)'; then \ + false; \ + elif test -n '$(MAKE_HOST)'; then \ + true; \ + elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \ + true; \ + else \ + false; \ + fi; \ +} +am__make_running_with_option = \ + case $${target_option-} in \ + ?) ;; \ + *) echo "am__make_running_with_option: internal error: invalid" \ + "target option '$${target_option-}' specified" >&2; \ + exit 1;; \ + esac; \ + has_opt=no; \ + sane_makeflags=$$MAKEFLAGS; \ + if $(am__is_gnu_make); then \ + sane_makeflags=$$MFLAGS; \ + else \ + case $$MAKEFLAGS in \ + *\\[\ \ ]*) \ + bs=\\; \ + sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \ + | sed "s/$$bs$$bs[$$bs $$bs ]*//g"`;; \ + esac; \ + fi; \ + skip_next=no; \ + strip_trailopt () \ + { \ + flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \ + }; \ + for flg in $$sane_makeflags; do \ + test $$skip_next = yes && { skip_next=no; continue; }; \ + case $$flg in \ + *=*|--*) continue;; \ + -*I) strip_trailopt 'I'; skip_next=yes;; \ + -*I?*) strip_trailopt 'I';; \ + -*O) strip_trailopt 'O'; skip_next=yes;; \ + -*O?*) strip_trailopt 'O';; \ + -*l) strip_trailopt 'l'; skip_next=yes;; \ + -*l?*) strip_trailopt 'l';; \ + -[dEDm]) skip_next=yes;; \ + -[JT]) skip_next=yes;; \ + esac; \ + case $$flg in \ + *$$target_option*) has_opt=yes; break;; \ + esac; \ + done; \ + test $$has_opt = yes +am__make_dryrun = (target_option=n; $(am__make_running_with_option)) +am__make_keepgoing = (target_option=k; $(am__make_running_with_option)) +pkgdatadir = $(datadir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkglibexecdir = $(libexecdir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +subdir = contrib/imkmsg +ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 +am__aclocal_m4_deps = $(top_srcdir)/m4/ac_check_define.m4 \ + $(top_srcdir)/m4/atomic_operations.m4 \ + $(top_srcdir)/m4/atomic_operations_64bit.m4 \ + $(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \ + $(top_srcdir)/m4/ltsugar.m4 $(top_srcdir)/m4/ltversion.m4 \ + $(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/configure.ac +am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \ + $(ACLOCAL_M4) +DIST_COMMON = $(srcdir)/Makefile.am $(am__DIST_COMMON) +mkinstalldirs = $(install_sh) -d +CONFIG_HEADER = $(top_builddir)/config.h +CONFIG_CLEAN_FILES = +CONFIG_CLEAN_VPATH_FILES = +am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`; +am__vpath_adj = case $$p in \ + $(srcdir)/*) f=`echo "$$p" | sed "s|^$$srcdirstrip/||"`;; \ + *) f=$$p;; \ + esac; +am__strip_dir = f=`echo $$p | sed -e 's|^.*/||'`; +am__install_max = 40 +am__nobase_strip_setup = \ + srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*|]/\\\\&/g'` +am__nobase_strip = \ + for p in $$list; do echo "$$p"; done | sed -e "s|$$srcdirstrip/||" +am__nobase_list = $(am__nobase_strip_setup); \ + for p in $$list; do echo "$$p $$p"; done | \ + sed "s| $$srcdirstrip/| |;"' / .*\//!s/ .*/ ./; s,\( .*\)/[^/]*$$,\1,' | \ + $(AWK) 'BEGIN { files["."] = "" } { files[$$2] = files[$$2] " " $$1; \ + if (++n[$$2] == $(am__install_max)) \ + { print $$2, files[$$2]; n[$$2] = 0; files[$$2] = "" } } \ + END { for (dir in files) print dir, files[dir] }' +am__base_list = \ + sed '$$!N;$$!N;$$!N;$$!N;$$!N;$$!N;$$!N;s/\n/ /g' | \ + sed '$$!N;$$!N;$$!N;$$!N;s/\n/ /g' +am__uninstall_files_from_dir = { \ + test -z "$$files" \ + || { test ! 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information see that file. + * + * To test under Linux: + * echo test1 > /dev/kmsg + * + * Copyright (C) 2008-2023 Adiscon GmbH + * + * This file is part of rsyslog. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * -or- + * see COPYING.ASL20 in the source distribution + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#include "config.h" +#include "rsyslog.h" +#include <stdio.h> +#include <assert.h> +#include <string.h> +#include <stdarg.h> +#include <ctype.h> +#include <stdlib.h> +#include <sys/socket.h> + +#include "dirty.h" +#include "cfsysline.h" +#include "obj.h" +#include "msg.h" +#include "module-template.h" +#include "datetime.h" +#include "imkmsg.h" +#include "net.h" +#include "glbl.h" +#include "prop.h" +#include "errmsg.h" +#include "unicode-helper.h" + +MODULE_TYPE_INPUT +MODULE_TYPE_NOKEEP +MODULE_CNFNAME("imkmsg") + +/* Module static data */ +DEF_IMOD_STATIC_DATA +DEFobjCurrIf(datetime) +DEFobjCurrIf(glbl) +DEFobjCurrIf(prop) +DEFobjCurrIf(net) + +/* config settings */ +typedef struct configSettings_s { + int iFacilIntMsg; /* the facility to use for internal messages (set by driver) */ +} configSettings_t; +static configSettings_t cs; + +static modConfData_t *loadModConf = NULL;/* modConf ptr to use for the current load process */ +static modConfData_t *runModConf = NULL;/* modConf ptr to use for the current load process */ +static int bLegacyCnfModGlobalsPermitted;/* are legacy module-global config parameters permitted? */ + +/* module-global parameters */ +static struct cnfparamdescr modpdescr[] = { + { "parsekerneltimestamp", eCmdHdlrGetWord, 0 }, + { "readmode", eCmdHdlrGetWord, 0 }, + { "expectedbootcompleteseconds", eCmdHdlrPositiveInt, 0 } +}; +static struct cnfparamblk modpblk = + { CNFPARAMBLK_VERSION, + sizeof(modpdescr)/sizeof(struct cnfparamdescr), + modpdescr + }; + +static prop_t *pInputName = NULL; +/* there is only one global inputName for all messages generated by this module */ +static prop_t *pLocalHostIP = NULL; /* a pseudo-constant propterty for 127.0.0.1 */ + +static inline void +initConfigSettings(void) +{ + cs.iFacilIntMsg = klogFacilIntMsg(); +} + + +/* enqueue the the kernel message into the message queue. + * The provided msg string is not freed - thus must be done + * by the caller. + * rgerhards, 2008-04-12 + */ +static rsRetVal +enqMsg(uchar *msg, uchar* pszTag, syslog_pri_t pri, struct timeval *tp, struct json_object *json) +{ + struct syslogTime st; + smsg_t *pMsg; + DEFiRet; + + assert(msg != NULL); + assert(pszTag != NULL); + + if(tp == NULL) { + CHKiRet(msgConstruct(&pMsg)); + } else { + datetime.timeval2syslogTime(tp, &st, TIME_IN_LOCALTIME); + CHKiRet(msgConstructWithTime(&pMsg, &st, tp->tv_sec)); + } + MsgSetFlowControlType(pMsg, eFLOWCTL_LIGHT_DELAY); + MsgSetInputName(pMsg, pInputName); + MsgSetRawMsgWOSize(pMsg, (char*)msg); + MsgSetMSGoffs(pMsg, 0); /* we do not have a header... */ + MsgSetRcvFrom(pMsg, glbl.GetLocalHostNameProp()); + MsgSetRcvFromIP(pMsg, pLocalHostIP); + MsgSetHOSTNAME(pMsg, glbl.GetLocalHostName(), ustrlen(glbl.GetLocalHostName())); + MsgSetTAG(pMsg, pszTag, ustrlen(pszTag)); + msgSetPRI(pMsg, pri); + pMsg->json = json; + CHKiRet(submitMsg2(pMsg)); + +finalize_it: + RETiRet; +} + + +/* log an imkmsg-internal message + * rgerhards, 2008-04-14 + */ +rsRetVal imkmsgLogIntMsg(syslog_pri_t priority, const char *fmt, ...) +{ + DEFiRet; + va_list ap; + uchar msgBuf[2048]; /* we use the same size as sysklogd to remain compatible */ + + va_start(ap, fmt); + vsnprintf((char*)msgBuf, sizeof(msgBuf), fmt, ap); + va_end(ap); + + logmsgInternal(NO_ERRCODE, priority, msgBuf, 0); + + RETiRet; +} + + +/* log a message from /dev/kmsg + */ +rsRetVal Syslog(syslog_pri_t priority, uchar *pMsg, struct timeval *tp, struct json_object *json) +{ + DEFiRet; + iRet = enqMsg((uchar*)pMsg, (uchar*) "kernel:", priority, tp, json); + RETiRet; +} + + +/* helper for some klog drivers which need to know the MaxLine global setting. They can + * not obtain it themselfs, because they are no modules and can not query the object hander. + * It would probably be a good idea to extend the interface to support it, but so far + * we create a (sufficiently valid) work-around. -- rgerhards, 2008-11-24 + */ +int klog_getMaxLine(void) +{ + return glbl.GetMaxLine(runModConf->pConf); +} + + +BEGINrunInput +CODESTARTrunInput + /* this is an endless loop - it is terminated when the thread is + * signalled to do so. This, however, is handled by the framework, + * right into the sleep below. + */ + while(!pThrd->bShallStop) { + /* klogLogKMsg() waits for the next kernel message, obtains it + * and then submits it to the rsyslog main queue. + * rgerhards, 2008-04-09 + */ + CHKiRet(klogLogKMsg(runModConf)); + } +finalize_it: +ENDrunInput + + +BEGINbeginCnfLoad +CODESTARTbeginCnfLoad + loadModConf = pModConf; + pModConf->pConf = pConf; + /* init our settings */ + pModConf->iFacilIntMsg = klogFacilIntMsg(); + pModConf->parseKernelStamp = KMSG_PARSE_TS_STARTUP_ONLY; + pModConf->readMode = KMSG_READMODE_FULL_BOOT; + pModConf->expected_boot_complete_secs = 90; + loadModConf->configSetViaV2Method = 0; + bLegacyCnfModGlobalsPermitted = 1; + /* init legacy config vars */ + initConfigSettings(); +ENDbeginCnfLoad + + +BEGINsetModCnf + struct cnfparamvals *pvals = NULL; + int i; +CODESTARTsetModCnf + pvals = nvlstGetParams(lst, &modpblk, NULL); + if(pvals == NULL) { + LogError(0, RS_RET_MISSING_CNFPARAMS, "error processing module " + "config parameters [module(...)]"); + ABORT_FINALIZE(RS_RET_MISSING_CNFPARAMS); + } + + if(Debug) { + dbgprintf("module (global) param blk for imkmsg:\n"); + cnfparamsPrint(&modpblk, pvals); + } + + for(i = 0 ; i < modpblk.nParams ; ++i) { + if(!pvals[i].bUsed) + continue; + if(!strcmp(modpblk.descr[i].name, "parsekerneltimestamp")) { + if( !es_strconstcmp(pvals[i].val.d.estr, "on") + || !es_strconstcmp(pvals[i].val.d.estr, "always")) { + loadModConf->parseKernelStamp = KMSG_PARSE_TS_ALWAYS; + } else if(!es_strconstcmp(pvals[i].val.d.estr, "startup")) { + loadModConf->parseKernelStamp = KMSG_PARSE_TS_STARTUP_ONLY; + } else if(!es_strconstcmp(pvals[i].val.d.estr, "off")) { + loadModConf->parseKernelStamp = KMSG_PARSE_TS_OFF; + } else { + const char *const cstr = es_str2cstr(pvals[i].val.d.estr, NULL); + LogError(0, RS_RET_PARAM_ERROR, "imkmsg: unknown " + "parse mode '%s'", cstr); + free((void*)cstr); + } + } else if(!strcmp(modpblk.descr[i].name, "expectedbootcompleteseconds")) { + loadModConf->expected_boot_complete_secs = pvals[i].val.d.n; + } else if(!strcmp(modpblk.descr[i].name, "readmode")) { + if(!es_strconstcmp(pvals[i].val.d.estr, "full-boot")) { + loadModConf->readMode = KMSG_READMODE_FULL_BOOT; + } else if(!es_strconstcmp(pvals[i].val.d.estr, "full-always")) { + loadModConf->readMode = KMSG_READMODE_FULL_ALWAYS; + } else if(!es_strconstcmp(pvals[i].val.d.estr, "new-only")) { + loadModConf->readMode = KMSG_READMODE_NEW_ONLY; + } else { + const char *const cstr = es_str2cstr(pvals[i].val.d.estr, NULL); + LogError(0, RS_RET_PARAM_ERROR, "imkmsg: unknown " + "read mode '%s', keeping default setting", cstr); + free((void*)cstr); + } + } else { + LogMsg(0, RS_RET_INTERNAL_ERROR, LOG_WARNING, + "imkmsg: RSYSLOG BUG, non-handled param '%s' in " + "beginCnfLoad\n", modpblk.descr[i].name); + } + } + + /* disable legacy module-global config directives */ + bLegacyCnfModGlobalsPermitted = 0; + loadModConf->configSetViaV2Method = 1; + +finalize_it: + if(pvals != NULL) + cnfparamvalsDestruct(pvals, &modpblk); +ENDsetModCnf + + +BEGINendCnfLoad +CODESTARTendCnfLoad + if(!loadModConf->configSetViaV2Method) { + /* persist module-specific settings from legacy config system */ + loadModConf->iFacilIntMsg = cs.iFacilIntMsg; + } + + loadModConf = NULL; /* done loading */ +ENDendCnfLoad + + +BEGINcheckCnf +CODESTARTcheckCnf +ENDcheckCnf + + +BEGINactivateCnfPrePrivDrop +CODESTARTactivateCnfPrePrivDrop + runModConf = pModConf; + iRet = klogWillRunPrePrivDrop(runModConf); +ENDactivateCnfPrePrivDrop + + +BEGINactivateCnf +CODESTARTactivateCnf +ENDactivateCnf + + +BEGINfreeCnf +CODESTARTfreeCnf +ENDfreeCnf + + +BEGINwillRun +CODESTARTwillRun + iRet = klogWillRunPostPrivDrop(runModConf); +ENDwillRun + + +BEGINafterRun +CODESTARTafterRun + iRet = klogAfterRun(runModConf); +ENDafterRun + + +BEGINmodExit +CODESTARTmodExit + if(pInputName != NULL) + prop.Destruct(&pInputName); + if(pLocalHostIP != NULL) + prop.Destruct(&pLocalHostIP); + + /* release objects we used */ + objRelease(glbl, CORE_COMPONENT); + objRelease(net, CORE_COMPONENT); + objRelease(datetime, CORE_COMPONENT); + objRelease(prop, CORE_COMPONENT); +ENDmodExit + + +BEGINqueryEtryPt +CODESTARTqueryEtryPt +CODEqueryEtryPt_STD_IMOD_QUERIES +CODEqueryEtryPt_STD_CONF2_QUERIES +CODEqueryEtryPt_STD_CONF2_PREPRIVDROP_QUERIES +CODEqueryEtryPt_STD_CONF2_setModCnf_QUERIES +ENDqueryEtryPt + +static rsRetVal resetConfigVariables(uchar __attribute__((unused)) *pp, void __attribute__((unused)) *pVal) +{ + cs.iFacilIntMsg = klogFacilIntMsg(); + return RS_RET_OK; +} + +BEGINmodInit() +CODESTARTmodInit + *ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */ +CODEmodInit_QueryRegCFSLineHdlr + CHKiRet(objUse(datetime, CORE_COMPONENT)); + CHKiRet(objUse(glbl, CORE_COMPONENT)); + CHKiRet(objUse(prop, CORE_COMPONENT)); + CHKiRet(objUse(net, CORE_COMPONENT)); + + /* we need to create the inputName property (only once during our lifetime) */ + CHKiRet(prop.CreateStringProp(&pInputName, UCHAR_CONSTANT("imkmsg"), sizeof("imkmsg") - 1)); + CHKiRet(prop.CreateStringProp(&pLocalHostIP, UCHAR_CONSTANT("127.0.0.1"), sizeof("127.0.0.1") - 1)); + + /* init legacy config settings */ + initConfigSettings(); + + CHKiRet(omsdRegCFSLineHdlr((uchar *)"debugprintkernelsymbols", 0, eCmdHdlrGoneAway, + NULL, NULL, STD_LOADABLE_MODULE_ID)); + CHKiRet(omsdRegCFSLineHdlr((uchar *)"klogsymbollookup", 0, eCmdHdlrGoneAway, + NULL, NULL, STD_LOADABLE_MODULE_ID)); + CHKiRet(omsdRegCFSLineHdlr((uchar *)"klogsymbolstwice", 0, eCmdHdlrGoneAway, + NULL, NULL, STD_LOADABLE_MODULE_ID)); + CHKiRet(omsdRegCFSLineHdlr((uchar *)"klogusesyscallinterface", 0, eCmdHdlrGoneAway, + NULL, NULL, STD_LOADABLE_MODULE_ID)); + CHKiRet(omsdRegCFSLineHdlr((uchar *)"resetconfigvariables", 1, eCmdHdlrCustomHandler, + resetConfigVariables, NULL, STD_LOADABLE_MODULE_ID)); +ENDmodInit diff --git a/contrib/imkmsg/imkmsg.h b/contrib/imkmsg/imkmsg.h new file mode 100644 index 0000000..0021f25 --- /dev/null +++ b/contrib/imkmsg/imkmsg.h @@ -0,0 +1,78 @@ +/* imkmsg.h + * These are the definitions for the kmsg message generation module. + * + * Copyright 2007-2023 Rainer Gerhards and Adiscon GmbH. + * + * This file is part of rsyslog. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * -or- + * see COPYING.ASL20 in the source distribution + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#ifndef IMKLOG_H_INCLUDED +#define IMKLOG_H_INCLUDED 1 + +#include "rsyslog.h" +#include "dirty.h" + +typedef enum _kernel_ts_parse_mods { + KMSG_PARSE_TS_OFF = 0, + KMSG_PARSE_TS_ALWAYS = 1, + KMSG_PARSE_TS_STARTUP_ONLY = 2 + } t_kernel_ts_parse_mode; + +typedef enum _kernel_readmode { + KMSG_READMODE_FULL_BOOT = 0, + KMSG_READMODE_FULL_ALWAYS = 1, + KMSG_READMODE_NEW_ONLY = 2 + } t_kernel_readmode; + +/* we need to have the modConf type present in all submodules */ +struct modConfData_s { + rsconf_t *pConf; + int iFacilIntMsg; + uchar *pszPath; + int console_log_level; + int expected_boot_complete_secs; + t_kernel_ts_parse_mode parseKernelStamp; + t_kernel_readmode readMode; + sbool configSetViaV2Method; +}; + +/* interface to "drivers" + * the platform specific drivers must implement these entry points. Only one + * driver may be active at any given time, thus we simply rely on the linker + * to resolve the addresses. + * rgerhards, 2008-04-09 + */ +rsRetVal klogLogKMsg(modConfData_t *pModConf); +rsRetVal klogWillRunPrePrivDrop(modConfData_t *pModConf); +rsRetVal klogWillRunPostPrivDrop(modConfData_t *pModConf); +rsRetVal klogAfterRun(modConfData_t *pModConf); +int klogFacilIntMsg(); + +/* the functions below may be called by the drivers */ +rsRetVal imkmsgLogIntMsg(syslog_pri_t priority, const char *fmt, ...) __attribute__((format(printf,2, 3))); +rsRetVal Syslog(syslog_pri_t priority, uchar *msg, struct timeval *tp, struct json_object *json); +int klogFacilIntMsg(void); + +/* prototypes */ +extern int klog_getMaxLine(void); /* work-around for klog drivers to get configured max line size */ +extern int InitKsyms(modConfData_t*); +extern void DeinitKsyms(void); +extern int InitMsyms(void); +extern void DeinitMsyms(void); +extern char * ExpandKadds(char *, char *); +extern void SetParanoiaLevel(int); + +#endif /* #ifndef IMKLOG_H_INCLUDED */ diff --git a/contrib/imkmsg/kmsg.c b/contrib/imkmsg/kmsg.c new file mode 100644 index 0000000..2548634 --- /dev/null +++ b/contrib/imkmsg/kmsg.c @@ -0,0 +1,327 @@ +/* imkmsg driver for Linux /dev/kmsg structured logging + * + * This contains Linux-specific functionality to read /dev/kmsg + * For a general overview, see head comment in imkmsg.c. + * This is heavily based on imklog bsd.c file. + * + * Copyright 2008-2023 Adiscon GmbH + * + * This file is part of rsyslog. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * -or- + * see COPYING.ASL20 in the source distribution + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif +#include <stdlib.h> +#include <time.h> +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> +#include <string.h> +#include <ctype.h> +#include <sys/klog.h> +#include <sys/sysinfo.h> +#include <sys/time.h> +#include <json.h> + +#include "rsyslog.h" +#include "srUtils.h" +#include "debug.h" +#include "imkmsg.h" + +/* globals */ +static int fklog = -1; /* kernel log fd */ +static int bInInitialReading = 1; /* are we in the intial kmsg reading phase? */ +/* Note: There is a problem with kernel log time. + * See https://github.com/troglobit/sysklogd/commit/9f6fbb3301e571d8af95f8d771469291384e9e95 + * We use the same work-around if bFixKernelStamp is on, and use the kernel log time + * only for past records, which we assume to be from recent boot. Later on, we do not + * use them but system time. + * UNFORTUNATELY, with /dev/kmsg, we always get old messages on startup. That means we + * may also pull old messages. We do not address this right now, as for 10 years "old + * messages" was pretty acceptable. So we wait until someone complains. Hint: we could + * do a seek to the end of kmsg if desired to not pull old messages. + * 2023-10-31 rgerhards + */ + +#ifndef _PATH_KLOG +# define _PATH_KLOG "/dev/kmsg" +#endif + +/* submit a message to imkmsg Syslog() API. In this function, we parse + * necessary information from kernel log line, and make json string + * from the rest. + */ +static void +submitSyslog(modConfData_t *const pModConf, const uchar *buf) +{ + long offs = 0; + struct timeval tv; + struct timeval *tp = NULL; + struct sysinfo info; + unsigned long int timestamp = 0; + char name[1024]; + char value[1024]; + char msg[1024]; + syslog_pri_t priority = 0; + long int sequnum = 0; + struct json_object *json = NULL, *jval; + + /* create new json object */ + json = json_object_new_object(); + + /* get priority */ + for (; isdigit(*buf); buf++) { + priority = (priority * 10) + (*buf - '0'); + } + buf++; + + /* get messages sequence number and add it to json */ + for (; isdigit(*buf); buf++) { + sequnum = (sequnum * 10) + (*buf - '0'); + } + buf++; /* skip , */ + jval = json_object_new_int(sequnum); + json_object_object_add(json, "sequnum", jval); + + /* get timestamp */ + for (; isdigit(*buf); buf++) { + timestamp = (timestamp * 10) + (*buf - '0'); + } + + while (*buf != ';') { + buf++; /* skip everything till the first ; */ + } + buf++; /* skip ; */ + + /* get message */ + offs = 0; + for (; *buf != '\n' && *buf != '\0'; buf++, offs++) { + msg[offs] = *buf; + } + msg[offs] = '\0'; + jval = json_object_new_string((char*)msg); + json_object_object_add(json, "msg", jval); + + if (*buf != '\0') /* message has appended properties, skip \n */ + buf++; + + while (*buf) { + /* get name of the property */ + buf++; /* skip ' ' */ + offs = 0; + for (; *buf != '=' && *buf != ' '; buf++, offs++) { + name[offs] = *buf; + } + name[offs] = '\0'; + buf++; /* skip = or ' ' */; + + offs = 0; + for (; *buf != '\n' && *buf != '\0'; buf++, offs++) { + value[offs] = *buf; + } + value[offs] = '\0'; + if (*buf != '\0') { + buf++; /* another property, skip \n */ + } + + jval = json_object_new_string((char*)value); + json_object_object_add(json, name, jval); + } + + if( (pModConf->parseKernelStamp == KMSG_PARSE_TS_ALWAYS) + || ((pModConf->parseKernelStamp == KMSG_PARSE_TS_STARTUP_ONLY) && bInInitialReading) ) { + /* calculate timestamp */ + sysinfo(&info); + gettimeofday(&tv, NULL); + + /* get boot time */ + tv.tv_sec -= info.uptime; + + tv.tv_sec += timestamp / 1000000; + tv.tv_usec += timestamp % 1000000; + + while (tv.tv_usec < 0) { + tv.tv_sec--; + tv.tv_usec += 1000000; + } + + while (tv.tv_usec >= 1000000) { + tv.tv_sec++; + tv.tv_usec -= 1000000; + } + + tp = &tv; + } + + Syslog(priority, (uchar *)msg, tp, json); +} + + +/* open the kernel log - will be called inside the willRun() imkmsg entry point + */ +rsRetVal +klogWillRunPrePrivDrop(modConfData_t __attribute__((unused)) *pModConf) +{ + char errmsg[2048]; + DEFiRet; + + fklog = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK, 0); + if (fklog < 0) { + imkmsgLogIntMsg(LOG_ERR, "imkmsg: cannot open kernel log (%s): %s.", + _PATH_KLOG, rs_strerror_r(errno, errmsg, sizeof(errmsg))); + ABORT_FINALIZE(RS_RET_ERR_OPEN_KLOG); + } + +finalize_it: + RETiRet; +} + +/* make sure the kernel log is readable after dropping privileges + */ +rsRetVal +klogWillRunPostPrivDrop(modConfData_t __attribute__((unused)) *pModConf) +{ + char errmsg[2048]; + int r; + DEFiRet; + + /* this normally returns EINVAL */ + /* on an OpenVZ VM, we get EPERM */ + r = read(fklog, NULL, 0); + if (r < 0 && errno != EINVAL && errno != EAGAIN && errno != EWOULDBLOCK) { + imkmsgLogIntMsg(LOG_ERR, "imkmsg: cannot open kernel log (%s): %s.", + _PATH_KLOG, rs_strerror_r(errno, errmsg, sizeof(errmsg))); + fklog = -1; + ABORT_FINALIZE(RS_RET_ERR_OPEN_KLOG); + } + +finalize_it: + RETiRet; +} + + +static void +change_reads_to_blocking(const int fd) +{ + const int flags = fcntl(fd, F_GETFL, 0); + fcntl(fd, F_SETFL, flags & ~O_NONBLOCK); +} + +/* Read kernel log while data are available, each read() reads one + * record of printk buffer. + */ +static void +readkmsg(modConfData_t *const pModConf) +{ + int i; + uchar pRcv[16*1024+1]; + char errmsg[2048]; + off_t seek_result = 0; + + if(pModConf->readMode == KMSG_READMODE_FULL_BOOT) { + struct sysinfo info; + sysinfo(&info); + DBGPRINTF("imkmsg: system uptime is %lld, expected %d\n", + (long long) info.uptime, pModConf->expected_boot_complete_secs); + if(info.uptime > pModConf->expected_boot_complete_secs) { + seek_result = lseek(fklog, 0, SEEK_END); + } + } else if(pModConf->readMode == KMSG_READMODE_NEW_ONLY) { + seek_result = lseek(fklog, 0, SEEK_END); + } else if(pModConf->readMode != KMSG_READMODE_FULL_ALWAYS) { + imkmsgLogIntMsg(LOG_ERR, "imkmsg: internal program error, " + "unknown read mode %d, assuming 'full-always'", + pModConf->readMode); + } + + if(seek_result == (off_t) -1) { + imkmsgLogIntMsg(LOG_WARNING, + "imkmsg: could not seek to requested klog entries - will" + "now potentially output all messages"); + } + + for (;;) { + dbgprintf("imkmsg waiting for kernel log line\n"); + + /* every read() from the opened device node receives one record of the printk buffer */ + i = read(fklog, pRcv, 8192); + if (i > 0) { + /* successful read of message of nonzero length */ + pRcv[i] = '\0'; + } else if (i < 0 && errno == EPIPE) { + imkmsgLogIntMsg(LOG_WARNING, + "imkmsg: some messages in circular buffer got overwritten"); + continue; + } else { + /* something went wrong - error or zero length message */ + if(i < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) { + DBGPRINTF("imkmsg: initial read done, changing to blocking mode\n"); + change_reads_to_blocking(fklog); + bInInitialReading = 0; + continue; + } + if(i < 0 && errno != EINTR && errno != EAGAIN) { + /* error occurred */ + imkmsgLogIntMsg(LOG_ERR, + "imkmsg: error reading kernel log - shutting down: %s", + rs_strerror_r(errno, errmsg, sizeof(errmsg))); + fklog = -1; + } + break; + } + + submitSyslog(pModConf, pRcv); + } +} + + +/* to be called in the module's AfterRun entry point + * rgerhards, 2008-04-09 + */ +rsRetVal klogAfterRun(modConfData_t *pModConf) +{ + DEFiRet; + if(fklog != -1) + close(fklog); + /* Turn on logging of messages to console, but only if a log level was speficied */ + if(pModConf->console_log_level != -1) + klogctl(7, NULL, 0); + RETiRet; +} + + +/* to be called in the module's WillRun entry point, this is the main + * "message pull" mechanism. + * rgerhards, 2008-04-09 + */ +rsRetVal klogLogKMsg(modConfData_t *const pModConf) +{ + DEFiRet; + readkmsg(pModConf); + RETiRet; +} + + +/* provide the (system-specific) default facility for internal messages + * rgerhards, 2008-04-14 + */ +int +klogFacilIntMsg(void) +{ + return LOG_SYSLOG; +} + |