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/* imudp.c
* This is the implementation of the UDP input module.
*
* NOTE: read comments in module-template.h to understand how this file
* works!
*
* File begun on 2007-12-21 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 <stdlib.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <netdb.h>
#include "rsyslog.h"
#include "syslogd.h"
#include "cfsysline.h"
#include "module-template.h"
MODULE_TYPE_INPUT
TERM_SYNC_TYPE(eTermSync_NONE)
/* defines */
/* Module static data */
DEF_IMOD_STATIC_DATA
static int *udpLstnSocks = NULL; /* Internet datagram sockets, first element is nbr of elements
* read-only after init(), but beware of restart! */
static uchar *pszLstnPort = NULL;
typedef struct _instanceData {
} instanceData;
/* config settings */
/* This function is called to gather input.
*/
BEGINrunInput
int maxfds;
int nfds;
int i;
fd_set readfds;
struct sockaddr_storage frominet;
socklen_t socklen;
uchar fromHost[NI_MAXHOST];
uchar fromHostFQDN[NI_MAXHOST];
char line[MAXLINE +1];
ssize_t l;
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) {
/* 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);
/* Add the UDP listen sockets to the list of read descriptors.
*/
if(udpLstnSocks != NULL && AcceptRemote) {
for (i = 0; i < *udpLstnSocks; i++) {
if (udpLstnSocks[i+1] != -1) {
if(Debug)
debugListenInfo(udpLstnSocks[i+1], "UDP");
FD_SET(udpLstnSocks[i+1], &readfds);
if(udpLstnSocks[i+1]>maxfds) maxfds=udpLstnSocks[i+1];
}
}
}
if(Debug) {
dbgprintf("--------imUDP calling select, active file descriptors (max %d): ", maxfds);
for (nfds = 0; nfds <= maxfds; ++nfds)
if ( FD_ISSET(nfds, &readfds) )
dbgprintf("%d ", nfds);
dbgprintf("\n");
}
/* wait for io to become ready */
nfds = select(maxfds+1, (fd_set *) &readfds, NULL, NULL, NULL);
if (udpLstnSocks != NULL && AcceptRemote) {
for (i = 0; nfds && i < *udpLstnSocks; i++) {
if (FD_ISSET(udpLstnSocks[i+1], &readfds)) {
socklen = sizeof(frominet);
l = recvfrom(udpLstnSocks[i+1], line, MAXLINE - 1, 0,
(struct sockaddr *)&frominet, &socklen);
if (l > 0) {
if(cvthname(&frominet, fromHost, fromHostFQDN) == RS_RET_OK) {
dbgprintf("Message from inetd socket: #%d, host: %s\n",
udpLstnSocks[i+1], fromHost);
/* Here we check if a host is permitted to send us
* syslog messages. If it isn't, we do not further
* process the message but log a warning (if we are
* configured to do this).
* rgerhards, 2005-09-26
*/
if(isAllowedSender(pAllowedSenders_UDP,
(struct sockaddr *)&frominet, (char*)fromHostFQDN)) {
printchopped((char*)fromHost, line, l, udpLstnSocks[i+1], 1);
} else {
dbgprintf("%s is not an allowed sender\n", (char*)fromHostFQDN);
if(option_DisallowWarning) {
logerrorSz("UDP message from disallowed sender %s discarded",
(char*)fromHost);
}
}
}
} else if (l < 0 && errno != EINTR && errno != EAGAIN) {
char errStr[1024];
strerror_r(errno, errStr, sizeof(errStr));
dbgprintf("INET socket error: %d = %s.\n", errno, errStr);
logerror("recvfrom inet");
/* should be harmless */
sleep(1);
}
--nfds; /* indicate we have processed one */
}
}
}
}
return iRet;
ENDrunInput
/* initialize and return if will run or not */
BEGINwillRun
CODESTARTwillRun
PrintAllowedSenders(1); /* UDP */
if((udpLstnSocks = create_udp_socket(NULL, (pszLstnPort == NULL) ? (uchar*) "514" : pszLstnPort, 1)) != NULL)
dbgprintf("Opened %d syslog UDP port(s).\n", *udpLstnSocks);
#if 0
/* TODO: think if we need this code - so far, I simply use "syslog" as port name
* if none is specified. That looks OK to me - but I do not remove that code here
* so that we can think about it once again. Please note that the code here needs
* to be adapted, I haven't done that because I came to the idea I do not need it...
* rgerahrds, 2007-12-26
*/
struct servent *sp;
if(pszLstnPort == NULL) {
/* I was told by an IPv6 expert that calling getservbyname() seems to be
* still valid, at least for the use case we have. So I re-enabled that
* code. rgerhards, 2007-07-02
*/
/* we shall use the default syslog/udp port, so let's
* look it up.
* TODO: getservbyname() is not thread-safe, we need to replace it.
*/
sp = getservbyname("syslog", "udp");
if (sp == NULL) {
errno = 0;
logerror("Could not find syslog/udp port in /etc/services. "
"Now using IANA-assigned default of 514.");
LogPort = "514";
} else {
/* we can dynamically allocate memory here and do NOT need
* to care about freeing it because even though init() is
* called on each restart, the LogPort can never again be
* "0". So we will only once run into this part of the code
* here. rgerhards, 2007-07-02
* We save ourselfs the hassle of dynamic memory management
* for the very same reason.
*/
// we need to do dynamic memory alloc here!
snprintf(defPort, sizeof(defPort), "%d", ntohs(sp->s_port));
LogPort = defPort;
}
}
#endif
ENDwillRun
BEGINafterRun
CODESTARTafterRun
/* do cleanup here */
dbgprintf("call clearAllowedSenders(0x%lx)\n", (unsigned long) pAllowedSenders_UDP);
if (pAllowedSenders_UDP != NULL) {
clearAllowedSenders (pAllowedSenders_UDP);
pAllowedSenders_UDP = NULL;
}
if(udpLstnSocks != NULL)
closeUDPListenSockets(udpLstnSocks);
if(pszLstnPort != NULL)
free(pszLstnPort);
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)
{
if(pszLstnPort != NULL) {
free(pszLstnPort);
pszLstnPort = NULL;
}
return RS_RET_OK;
}
BEGINmodInit()
CODESTARTmodInit
*ipIFVersProvided = 1; /* so far, we only support the initial definition */
CODEmodInit_QueryRegCFSLineHdlr
/* register config file handlers */
CHKiRet(omsdRegCFSLineHdlr((uchar *)"udplistenport", 0, eCmdHdlrGetWord,
NULL, &pszLstnPort, STD_LOADABLE_MODULE_ID));
CHKiRet(omsdRegCFSLineHdlr((uchar *)"resetconfigvariables", 1, eCmdHdlrCustomHandler,
resetConfigVariables, NULL, STD_LOADABLE_MODULE_ID));
ENDmodInit
/*
* vi:set ai:
*/
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