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/* iminternal.c
* This file set implements the internal messages input module for rsyslog.
* Note: we currently do not have an input module spec, but
* we will have one in the future. This module needs then to be
* adapted.
*
* File begun on 2007-08-03 by RGerhards
*
* Copyright 2007-2022 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.
*/
#include "config.h"
#include "rsyslog.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <signal.h>
#include "syslogd.h"
#include "linkedlist.h"
#include "iminternal.h"
#include "unicode-helper.h"
static linkedList_t llMsgs;
static pthread_mutex_t mutList = PTHREAD_MUTEX_INITIALIZER;
/* destructs an iminternal object
*/
static rsRetVal iminternalDestruct(iminternal_t *pThis)
{
DEFiRet;
if(pThis->pMsg != NULL)
msgDestruct(&pThis->pMsg);
free(pThis);
RETiRet;
}
/* Construct an iminternal object
*/
static rsRetVal iminternalConstruct(iminternal_t **ppThis)
{
DEFiRet;
if((*ppThis = (iminternal_t*) calloc(1, sizeof(iminternal_t))) == NULL) {
iRet = RS_RET_OUT_OF_MEMORY;
}
RETiRet;
}
/* add a message to the linked list
* Note: the pMsg reference counter is not incremented. Consequently,
* the caller must NOT decrement it. The caller actually hands over
* full ownership of the pMsg object.
*/
rsRetVal iminternalAddMsg(smsg_t *pMsg)
{
DEFiRet;
iminternal_t *pThis = NULL;
struct timespec to;
int r;
int is_locked = 0;
/* we guard against deadlock, so we can guarantee rsyslog will never
* block due to internal messages. The 1 second timeout should be
* sufficient under all circumstances.
*/
to.tv_sec = time(NULL) + 1;
to.tv_nsec = 0;
#if !defined(__APPLE__)
r = pthread_mutex_timedlock(&mutList, &to);
#else
r = pthread_mutex_trylock(&mutList); // must check
#endif
if(r != 0) {
dbgprintf("iminternalAddMsg: timedlock for mutex failed with %d, msg %s\n",
r, getMSG(pMsg));
/* the message is lost, nothing we can do against this! */
msgDestruct(&pMsg);
ABORT_FINALIZE(RS_RET_ERR);
}
is_locked = 1;
CHKiRet(iminternalConstruct(&pThis));
pThis->pMsg = pMsg;
CHKiRet(llAppend(&llMsgs, NULL, (void*) pThis));
if(PREFER_FETCH_32BIT(bHaveMainQueue)) {
DBGPRINTF("signaling new internal message via SIGTTOU: '%s'\n",
pThis->pMsg->pszRawMsg);
kill(glblGetOurPid(), SIGTTOU);
}
finalize_it:
if(is_locked) {
pthread_mutex_unlock(&mutList);
}
if(iRet != RS_RET_OK) {
dbgprintf("iminternalAddMsg() error %d - can not otherwise report this error, message lost\n", iRet);
if(pThis != NULL)
iminternalDestruct(pThis);
}
RETiRet;
}
/* pull the first error message from the linked list, remove it
* from the list and return it to the caller. The caller is
* responsible for freeing the message!
*/
rsRetVal iminternalRemoveMsg(smsg_t **ppMsg)
{
DEFiRet;
iminternal_t *pThis;
linkedListCookie_t llCookie = NULL;
pthread_mutex_lock(&mutList);
CHKiRet(llGetNextElt(&llMsgs, &llCookie, (void*)&pThis));
if(!strcmp((char*)pThis->pMsg->pszHOSTNAME, "[localhost]")) {
/* early (pre-conf) startup message detected, need to set real hostname now */
MsgSetHOSTNAME(pThis->pMsg, glblGetLocalHostName(), ustrlen(glblGetLocalHostName()));
}
*ppMsg = pThis->pMsg;
pThis->pMsg = NULL; /* we do no longer own it - important for destructor */
if(llDestroyRootElt(&llMsgs) != RS_RET_OK) {
dbgprintf("Root element of iminternal linked list could not be destroyed - there is "
"nothing we can do against it, we ignore it for now. Things may go wild "
"from here on. This is most probably a program logic error.\n");
}
finalize_it:
pthread_mutex_unlock(&mutList);
RETiRet;
}
/* initialize the iminternal subsystem
* must be called once at the start of the program
*/
rsRetVal modInitIminternal(void)
{
DEFiRet;
iRet = llInit(&llMsgs, iminternalDestruct, NULL, NULL);
RETiRet;
}
/* de-initialize the iminternal subsystem
* must be called once at the end of the program
* Note: the error list must have been pulled first. We do
* NOT care if there are any errors left - we simply destroy
* them.
*/
rsRetVal modExitIminternal(void)
{
DEFiRet;
iRet = llDestroy(&llMsgs);
RETiRet;
}
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