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/* imuxsock.c
* This is the implementation of the Unix sockets input module.
*
* NOTE: read comments in module-template.h to understand how this file
* works!
*
* File begun on 2007-12-20 by RGerhards (extracted from syslogd.c)
*
* Copyright 2007 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Rsyslog is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#include "config.h"
#include "rsyslog.h"
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/un.h>
#include "syslogd.h"
#include "cfsysline.h"
#include "module-template.h"
MODULE_TYPE_INPUT
TERM_SYNC_TYPE(eTermSync_SIGNAL)
/* defines */
#define MAXFUNIX 20
/* handle some defines missing on more than one platform */
#ifndef SUN_LEN
#define SUN_LEN(su) \
(sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))
#endif
/* Module static data */
DEF_IMOD_STATIC_DATA
typedef struct _instanceData {
} instanceData;
int startIndexUxLocalSockets = 0; /* process funix from that index on (used to
* suppress local logging. rgerhards 2005-08-01
* read-only after startup
*/
int funixParseHost[MAXFUNIX] = { 0, }; /* should parser parse host name? read-only after startup */
char *funixn[MAXFUNIX] = { _PATH_LOG }; /* read-only after startup */
int funix[MAXFUNIX] = { -1, }; /* read-only after startup */
static int nfunix = 1; /* number of Unix sockets open / read-only after startup */
static int create_unix_socket(const char *path)
{
struct sockaddr_un sunx;
int fd;
char line[MAXLINE +1];
if (path[0] == '\0')
return -1;
(void) unlink(path);
memset(&sunx, 0, sizeof(sunx));
sunx.sun_family = AF_UNIX;
(void) strncpy(sunx.sun_path, path, sizeof(sunx.sun_path));
fd = socket(AF_UNIX, SOCK_DGRAM, 0);
if (fd < 0 || bind(fd, (struct sockaddr *) &sunx,
SUN_LEN(&sunx)) < 0 ||
chmod(path, 0666) < 0) {
snprintf(line, sizeof(line), "cannot create %s", path);
logerror(line);
dbgprintf("cannot create %s (%d).\n", path, errno);
close(fd);
return -1;
}
return fd;
}
/* This function receives data from a socket indicated to be ready
* to receive and submits the message received for processing.
* rgerhards, 2007-12-20
*/
static rsRetVal readSocket(int fd, int bParseHost)
{
DEFiRet;
int iRcvd;
char line[MAXLINE +1];
iRcvd = recv(fd, line, MAXLINE - 1, 0);
dbgprintf("Message from UNIX socket: #%d\n", fd);
if (iRcvd > 0) {
printchopped(LocalHostName, line, iRcvd, fd, bParseHost);
} else if (iRcvd < 0 && errno != EINTR) {
char errStr[1024];
strerror_r(errno, errStr, sizeof(errStr));
dbgprintf("UNIX socket error: %d = %s.\n", \
errno, errStr);
logerror("recvfrom UNIX");
}
return iRet;
}
/* This function is called to gather input.
*/
BEGINrunInput
int maxfds;
int nfds;
int i;
int fd;
fd_set readfds;
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(1) {
/* we do not need to handle the RS_RET_TERMINATE_NOW case any
* special because we just need to terminate. Cleanup is done
* during afterRun(). -- rgerhards 2007-12-20
*/
/* Add the Unix Domain Sockets to the list of read
* descriptors.
* rgerhards 2005-08-01: we must now check if there are
* any local sockets to listen to at all. If the -o option
* is given without -a, we do not need to listen at all..
*/
maxfds = 0;
FD_ZERO (&readfds);
/* Copy master connections */
for (i = startIndexUxLocalSockets; i < nfunix; i++) {
if (funix[i] != -1) {
FD_SET(funix[i], &readfds);
if (funix[i]>maxfds) maxfds=funix[i];
}
}
/* select() here */
nfds = select(maxfds+1, (fd_set *) &readfds, NULL, NULL, NULL);
for (i = 0; i < nfunix && nfds > 0; i++) {
if ((fd = funix[i]) != -1 && FD_ISSET(fd, &readfds)) {
readSocket(fd, funixParseHost[i]);
--nfds; /* indicate we have processed one */
}
}
}
return iRet;
ENDrunInput
BEGINwillRun
CODESTARTwillRun
register int i;
for (i = 1; i < MAXFUNIX; i++) {
funixn[i] = "";
funix[i] = -1;
}
/* initialize and return if will run or not */
for (i = startIndexUxLocalSockets ; i < nfunix ; i++) {
if (funix[i] != -1)
/* Don't close the socket, preserve it instead
close(funix[i]);
*/
continue;
if ((funix[i] = create_unix_socket(funixn[i])) != -1)
dbgprintf("Opened UNIX socket '%s' (fd %d).\n", funixn[i], funix[i]);
}
return RS_RET_OK;
ENDwillRun
BEGINafterRun
CODESTARTafterRun
int i;
/* do cleanup here */
/* Close the UNIX sockets. */
for (i = 0; i < nfunix; i++)
if (funix[i] != -1)
close(funix[i]);
/* Clean-up files. */
for (i = 0; i < nfunix; i++)
if (funixn[i] && funix[i] != -1)
(void)unlink(funixn[i]);
ENDafterRun
BEGINfreeInstance
CODESTARTfreeInstance
ENDfreeInstance
BEGINdbgPrintInstInfo
CODESTARTdbgPrintInstInfo
ENDdbgPrintInstInfo
BEGINmodExit
CODESTARTmodExit
ENDmodExit
BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_IMOD_QUERIES
ENDqueryEtryPt
static rsRetVal resetConfigVariables(uchar __attribute__((unused)) *pp, void __attribute__((unused)) *pVal)
{
return RS_RET_OK;
}
BEGINmodInit()
CODESTARTmodInit
*ipIFVersProvided = 1; /* so far, we only support the initial definition */
CODEmodInit_QueryRegCFSLineHdlr
//CHKiRet(omsdRegCFSLineHdlr((uchar *)"markmessageperiod", 0, eCmdHdlrInt, NULL, &iMarkMessagePeriod, STD_LOADABLE_MODULE_ID));
CHKiRet(omsdRegCFSLineHdlr((uchar *)"resetconfigvariables", 1, eCmdHdlrCustomHandler, resetConfigVariables, NULL, STD_LOADABLE_MODULE_ID));
ENDmodInit
/*
* vi:set ai:
*/
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