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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 /plugins/omudpspoof | |
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-- | plugins/omudpspoof/Makefile.am | 8 | ||||
-rw-r--r-- | plugins/omudpspoof/Makefile.in | 798 | ||||
-rw-r--r-- | plugins/omudpspoof/omudpspoof.c | 819 |
3 files changed, 1625 insertions, 0 deletions
diff --git a/plugins/omudpspoof/Makefile.am b/plugins/omudpspoof/Makefile.am new file mode 100644 index 0000000..79c495a --- /dev/null +++ b/plugins/omudpspoof/Makefile.am @@ -0,0 +1,8 @@ +pkglib_LTLIBRARIES = omudpspoof.la + +omudpspoof_la_SOURCES = omudpspoof.c +omudpspoof_la_CPPFLAGS = $(RSRT_CFLAGS) $(PTHREADS_CFLAGS) $(UDPSPOOF_CFLAGS) +omudpspoof_la_LDFLAGS = -module -avoid-version +omudpspoof_la_LIBADD = $(UDPSPOOF_LIBS) + +EXTRA_DIST = diff --git a/plugins/omudpspoof/Makefile.in b/plugins/omudpspoof/Makefile.in new file mode 100644 index 0000000..3babfc7 --- /dev/null +++ b/plugins/omudpspoof/Makefile.in @@ -0,0 +1,798 @@ +# 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; 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I then created a "real" rsyslog module + * out of that code and omfwd. I decided to make it a separate module because + * omfwd already mixes up too many things (TCP & UDP & a different modes, + * this has historic reasons), it would not be a good idea to also add + * spoofing to it. And, looking at the requirements, there is little in + * common between omfwd and this module. + * + * Note: I have briefly checked libnet source code and I somewhat have the feeling + * that under some circumstances we may get into trouble with the lib. For + * example, it registers an atexit() handler, which should not play nicely + * with our dynamically loaded modules. Anyhow, I refrain from looking deeper + * at libnet code, especially as testing does not show any real issues. If some + * occur, it may be easier to modify libnet for dynamic load environments than + * using a work-around (as a side not, libnet looks somewhat unmaintained, the CVS + * I can see on sourceforge dates has no updates done less than 7 years ago). + * On the other hand, it looks like libnet is thread safe (at least is appropriately + * compiled, which I hope the standard packages are). So I do not guard calls to + * it with my own mutex calls. + * rgerhards, 2009-07-10 + * + * Copyright 2009 David Lang (spoofing code) + * Copyright 2009-2016 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 <stdio.h> +#include <stdarg.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <netinet/in.h> +#include <netdb.h> +#include <fnmatch.h> +#include <assert.h> +#include <errno.h> +#include <ctype.h> +#include <unistd.h> +#include "conf.h" +#include "syslogd-types.h" +#include "srUtils.h" +#include "net.h" +#include "template.h" +#include "msg.h" +#include "cfsysline.h" +#include "module-template.h" +#include "glbl.h" +#include "errmsg.h" +#include "dirty.h" +#include "unicode-helper.h" +#include "debug.h" + + +#include <libnet.h> +#define _BSD_SOURCE 1 +#define __BSD_SOURCE 1 +#define __FAVOR_BSD 1 + + +MODULE_TYPE_OUTPUT +MODULE_TYPE_NOKEEP +MODULE_CNFNAME("omudpspoof") + +/* internal structures + */ +DEF_OMOD_STATIC_DATA +DEFobjCurrIf(glbl) +DEFobjCurrIf(net) + +typedef struct _instanceData { + uchar *tplName; /* name of assigned template */ + uchar *host; + uchar *port; + uchar *sourceTpl; + int mtu; + u_short sourcePortStart; /* for sorce port iteration */ + u_short sourcePortEnd; + int bReportLibnetInitErr; /* help prevent multiple error messages on init err */ +} instanceData; + +typedef struct wrkrInstanceData { + instanceData *pData; + libnet_t *libnet_handle; + u_short sourcePort; + int *pSockArray; /* sockets to use for UDP */ + struct addrinfo *f_addr; + char errbuf[LIBNET_ERRBUF_SIZE]; +} wrkrInstanceData_t; + +#define DFLT_SOURCE_PORT_START 32000 +#define DFLT_SOURCE_PORT_END 42000 + +typedef struct configSettings_s { + uchar *tplName; /* name of the default template to use */ + uchar *pszSourceNameTemplate; /* name of the template containing the spoofing address */ + uchar *pszTargetHost; + uchar *pszTargetPort; + int iSourcePortStart; + int iSourcePortEnd; +} configSettings_t; +static configSettings_t cs; + +/* action (instance) parameters */ +static struct cnfparamdescr actpdescr[] = { + { "target", eCmdHdlrGetWord, 1 }, + { "port", eCmdHdlrGetWord, 0 }, + { "sourcetemplate", eCmdHdlrGetWord, 0 }, + { "sourceport.start", eCmdHdlrInt, 0 }, + { "sourceport.end", eCmdHdlrInt, 0 }, + { "mtu", eCmdHdlrInt, 0 }, + { "template", eCmdHdlrGetWord, 0 } +}; +static struct cnfparamblk actpblk = + { CNFPARAMBLK_VERSION, + sizeof(actpdescr)/sizeof(struct cnfparamdescr), + actpdescr + }; + +/* module-global parameters */ +static struct cnfparamdescr modpdescr[] = { + { "template", eCmdHdlrGetWord, 0 }, +}; +static struct cnfparamblk modpblk = + { CNFPARAMBLK_VERSION, + sizeof(modpdescr)/sizeof(struct cnfparamdescr), + modpdescr + }; + +struct modConfData_s { + rsconf_t *pConf; /* our overall config object */ + uchar *tplName; /* default template */ +}; + +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 exec process */ + +BEGINinitConfVars /* (re)set config variables to default values */ +CODESTARTinitConfVars + cs.tplName = NULL; + cs.pszSourceNameTemplate = NULL; + cs.pszTargetHost = NULL; + cs.pszTargetPort = NULL; + cs.iSourcePortStart = DFLT_SOURCE_PORT_START; + cs.iSourcePortEnd = DFLT_SOURCE_PORT_END; +ENDinitConfVars + + +/* add some variables needed for libnet */ +pthread_mutex_t mutLibnet; + +/* forward definitions */ +static rsRetVal doTryResume(wrkrInstanceData_t *pWrkrData); + +/* this function gets the default template. It coordinates action between + * old-style and new-style configuration parts. + */ +static uchar* +getDfltTpl(void) +{ + if(loadModConf != NULL && loadModConf->tplName != NULL) + return loadModConf->tplName; + else if(cs.tplName == NULL) + return (uchar*)"RSYSLOG_TraditionalForwardFormat"; + else + return cs.tplName; +} + + +/* set the default template to be used + * This is a module-global parameter, and as such needs special handling. It needs to + * be coordinated with values set via the v2 config system (rsyslog v6+). What we do + * is we do not permit this directive after the v2 config system has been used to set + * the parameter. + */ +static rsRetVal +setLegacyDfltTpl(void __attribute__((unused)) *pVal, uchar* newVal) +{ + DEFiRet; + + if(loadModConf != NULL && loadModConf->tplName != NULL) { + free(newVal); + LogError(0, RS_RET_ERR, "omudpspoof default template already set via module " + "global parameter - can no longer be changed"); + ABORT_FINALIZE(RS_RET_ERR); + } + free(cs.tplName); + cs.tplName = newVal; +finalize_it: + RETiRet; +} + +/* Close the UDP sockets. + * rgerhards, 2009-05-29 + */ +static rsRetVal +closeUDPSockets(wrkrInstanceData_t *pWrkrData) +{ + DEFiRet; + if(pWrkrData->pSockArray != NULL) { + net.closeUDPListenSockets(pWrkrData->pSockArray); + pWrkrData->pSockArray = NULL; + freeaddrinfo(pWrkrData->f_addr); + pWrkrData->f_addr = NULL; + } + RETiRet; +} + + +/* get the syslog forward port + * We may change the implementation to try to lookup the port + * if it is unspecified. So far, we use the IANA default auf 514. + * rgerhards, 2007-06-28 + */ +static inline uchar *getFwdPt(instanceData *pData) +{ + return (pData->port == NULL) ? UCHAR_CONSTANT("514") : pData->port; +} + + +BEGINbeginCnfLoad +CODESTARTbeginCnfLoad + loadModConf = pModConf; + pModConf->pConf = pConf; + pModConf->tplName = NULL; +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 omudpspoof:\n"); + cnfparamsPrint(&modpblk, pvals); + } + + for(i = 0 ; i < modpblk.nParams ; ++i) { + if(!pvals[i].bUsed) + continue; + if(!strcmp(modpblk.descr[i].name, "template")) { + loadModConf->tplName = (uchar*)es_str2cstr(pvals[i].val.d.estr, NULL); + if(cs.tplName != NULL) { + LogError(0, RS_RET_DUP_PARAM, "omudpspoof: warning: default template " + "was already set via legacy directive - may lead to inconsistent " + "results."); + } + } else { + dbgprintf("omudpspoof: program error, non-handled " + "param '%s' in beginCnfLoad\n", modpblk.descr[i].name); + } + } +finalize_it: + if(pvals != NULL) + cnfparamvalsDestruct(pvals, &modpblk); +ENDsetModCnf + +BEGINendCnfLoad +CODESTARTendCnfLoad + loadModConf = NULL; /* done loading */ + /* free legacy config vars */ + free(cs.tplName); + cs.tplName = NULL; +ENDendCnfLoad + +BEGINcheckCnf +CODESTARTcheckCnf +ENDcheckCnf + +BEGINactivateCnf +CODESTARTactivateCnf + runModConf = pModConf; +ENDactivateCnf + +BEGINfreeCnf +CODESTARTfreeCnf + free(pModConf->tplName); +ENDfreeCnf + + +BEGINcreateInstance +CODESTARTcreateInstance + pData->mtu = 1500; + pData->bReportLibnetInitErr = 1; +ENDcreateInstance + + +BEGINcreateWrkrInstance +CODESTARTcreateWrkrInstance + pWrkrData->libnet_handle = NULL; + pWrkrData->sourcePort = pData->sourcePortStart; +ENDcreateWrkrInstance + +BEGINisCompatibleWithFeature +CODESTARTisCompatibleWithFeature + if(eFeat == sFEATURERepeatedMsgReduction) + iRet = RS_RET_OK; +ENDisCompatibleWithFeature + + +BEGINfreeInstance +CODESTARTfreeInstance + /* final cleanup */ + free(pData->tplName); + free(pData->port); + free(pData->host); + free(pData->sourceTpl); +ENDfreeInstance + +BEGINfreeWrkrInstance +CODESTARTfreeWrkrInstance + closeUDPSockets(pWrkrData); + if(pWrkrData->libnet_handle != NULL) + libnet_destroy(pWrkrData->libnet_handle); +ENDfreeWrkrInstance + + +BEGINdbgPrintInstInfo +CODESTARTdbgPrintInstInfo + DBGPRINTF("%s", pData->host); +ENDdbgPrintInstInfo + + +/* Send a message via UDP + * Note: libnet is not thread-safe, so we need to ensure that only one + * instance ever is calling libnet code. + * rgehards, 2007-12-20 + */ +#ifdef __GNUC__ +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wcast-align" +#endif +static rsRetVal +UDPSend(wrkrInstanceData_t *pWrkrData, uchar *pszSourcename, char *msg, size_t len) +{ + struct addrinfo *r; + int lsent = 0; + int bSendSuccess; + instanceData *pData; + struct sockaddr_in *tempaddr,source_ip; + libnet_ptag_t ip; + libnet_ptag_t udp; + sbool bNeedUnlock = 0; + /* hdrOffs = fragmentation flags + offset (in bytes) + * divided by 8 */ + unsigned msgOffs, hdrOffs; + unsigned maxPktLen, pktLen, udpPktLen; + uint16_t ip_id; + DEFiRet; + + if(pWrkrData->pSockArray == NULL) { + CHKiRet(doTryResume(pWrkrData)); + } + pData = pWrkrData->pData; + + if(len > 65528) { + DBGPRINTF("omudpspoof: msg with length %d truncated to 64k: '%.768s'\n", + (int) len, msg); + len = 65528; + } + + ip = udp = 0; + if(pWrkrData->sourcePort++ >= pData->sourcePortEnd){ + pWrkrData->sourcePort = pData->sourcePortStart; + } + + /* We need a non-zero id number for the IP headers, + * otherwise libnet will increase it after each + * build_ipv4, breaking the fragments */ + ip_id = (uint16_t)libnet_get_prand(LIBNET_PR16); + + inet_pton(AF_INET, (char*)pszSourcename, &(source_ip.sin_addr)); + bSendSuccess = RSFALSE; + d_pthread_mutex_lock(&mutLibnet); + bNeedUnlock = 1; + for (r = pWrkrData->f_addr; r && bSendSuccess == RSFALSE ; r = r->ai_next) { + tempaddr = (struct sockaddr_in *)r->ai_addr; + /* Getting max payload size (must be multiple of 8) */ + maxPktLen = (pData->mtu - LIBNET_IPV4_H) & ~0x07; + msgOffs = 0; + /* We're doing (payload size - UDP header size) and not + * checking if it's a multiple of 8 because we know the + * header is 8 bytes long */ + if(len > (maxPktLen - LIBNET_UDP_H) ) { + hdrOffs = IP_MF; + pktLen = maxPktLen - LIBNET_UDP_H; + udpPktLen = len; + } else { + hdrOffs = 0; + pktLen = len; + udpPktLen = len; + } + DBGPRINTF("omudpspoof: stage 1: MF:%d, msgOffs %d, hdrOffs %d, pktLen %d, udpPktLen %d, maxPktLen %d\n", + (hdrOffs & IP_MF) >> 13, (hdrOffs & 0x1FFF) << 3, hdrOffs, pktLen, udpPktLen, maxPktLen); + libnet_clear_packet(pWrkrData->libnet_handle); + + /* note: libnet does need ports in host order NOT in network byte order! -- rgerhards, 2009-11-12 */ + udp = libnet_build_udp( + pWrkrData->sourcePort, /* source port */ + ntohs(tempaddr->sin_port), /* destination port */ + udpPktLen+LIBNET_UDP_H, /* packet length - use the FULL UDP Packet Length here */ + 0, /* checksum */ + (u_char*)msg, /* payload */ + pktLen, /* payload size */ + pWrkrData->libnet_handle, /* libnet handle */ + udp); /* libnet id */ + if (udp == -1) { + DBGPRINTF("omudpspoof: can't build UDP header: %s\n", + libnet_geterror(pWrkrData->libnet_handle)); + } + + ip = libnet_build_ipv4( + LIBNET_IPV4_H+LIBNET_UDP_H+pktLen, /* length */ + 0, /* TOS */ + ip_id, /* IP ID */ + hdrOffs, /* IP Frag */ + 64, /* TTL */ + IPPROTO_UDP, /* protocol */ + 0, /* checksum */ + source_ip.sin_addr.s_addr, + tempaddr->sin_addr.s_addr, + NULL, /* payload */ + 0, /* payload size */ + pWrkrData->libnet_handle, /* libnet handle */ + ip); /* libnet id */ + if (ip == -1) { + DBGPRINTF("omudpspoof: can't build IP header: %s\n", + libnet_geterror(pWrkrData->libnet_handle)); + } + + // Disable UDP Checksum CALC if Packjet exceeds MTU + if(len > (maxPktLen - LIBNET_UDP_H) ) { + libnet_toggle_checksum(pWrkrData->libnet_handle, udp, 1); + } + /* Write it to the wire. */ + lsent = libnet_write(pWrkrData->libnet_handle); + if(lsent != (int) (LIBNET_IPV4_H+LIBNET_UDP_H+pktLen)) { + /* note: access to fd is a libnet internal. If a newer version of libnet does + * not expose that member, we should simply remove it. However, while it is there + * it is useful for consolidating with strace output. + */ + DBGPRINTF("omudpspoof: write error (total len %d): pktLen %d, sent %d, fd %d: %s\n", + (int) len, LIBNET_IPV4_H+LIBNET_UDP_H+pktLen, lsent, pWrkrData->libnet_handle->fd, + libnet_geterror(pWrkrData->libnet_handle)); + if(lsent != -1) { + bSendSuccess = RSTRUE; + } + } else { + bSendSuccess = RSTRUE; + } + msgOffs += pktLen; + + /* We need to get rid of the UDP header to build the other fragments */ + libnet_clear_packet(pWrkrData->libnet_handle); + ip = LIBNET_PTAG_INITIALIZER; + while(len > msgOffs ) { /* loop until all payload is sent */ + /* check if there will be more fragments */ + if((len - msgOffs) > maxPktLen) { + /* In IP's eyes, the UDP header in the first packet + * needs to be in the offset, so we add its size to + * the payload offset here */ + hdrOffs = IP_MF + (msgOffs + LIBNET_UDP_H)/8; + pktLen = maxPktLen; + } else { + /* See above */ + hdrOffs = (msgOffs + LIBNET_UDP_H)/8; + pktLen = len - msgOffs; + } + DBGPRINTF("omudpspoof: stage 2: MF:%d, hdrOffs %d, pktLen %d\n", + (hdrOffs & IP_MF) >> 13, (hdrOffs & 0x1FFF) << 3, pktLen); + ip = libnet_build_ipv4( + LIBNET_IPV4_H + pktLen, /* length */ + 0, /* TOS */ + ip_id, /* IP ID */ + hdrOffs, /* IP Frag */ + 64, /* TTL */ + IPPROTO_UDP, /* protocol */ + 0, /* checksum */ + source_ip.sin_addr.s_addr, + tempaddr->sin_addr.s_addr, + (uint8_t*)(msg+msgOffs), /* payload */ + pktLen, /* payload size */ + pWrkrData->libnet_handle, /* libnet handle */ + ip); /* libnet id */ + if (ip == -1) { + DBGPRINTF("omudpspoof: can't build IP fragment header: %s\n", + libnet_geterror(pWrkrData->libnet_handle)); + } + /* Write it to the wire. */ + lsent = libnet_write(pWrkrData->libnet_handle); + if(lsent != (int) (LIBNET_IPV4_H+pktLen)) { + DBGPRINTF("omudpspoof: fragment write error len %d, sent %d: %s\n", + (int) (LIBNET_IPV4_H+LIBNET_UDP_H+len), lsent, + libnet_geterror(pWrkrData->libnet_handle)); + bSendSuccess = RSFALSE; + continue; + } + msgOffs += pktLen; + } + } + +finalize_it: + if(iRet != RS_RET_OK) { + if(pWrkrData->libnet_handle != NULL) { + libnet_destroy(pWrkrData->libnet_handle); + pWrkrData->libnet_handle = NULL; + } + } + if(bNeedUnlock) { + d_pthread_mutex_unlock(&mutLibnet); + } + RETiRet; +} +#ifdef _GNUC__ +#pragma GCC diagnostic pop +#endif + +/* try to resume connection if it is not ready + * rgerhards, 2007-08-02 + */ +static rsRetVal doTryResume(wrkrInstanceData_t *pWrkrData) +{ + int iErr; + struct addrinfo *res; + struct addrinfo hints; + instanceData *pData; + DEFiRet; + + if(pWrkrData->pSockArray != NULL) + FINALIZE; + pData = pWrkrData->pData; + + if(pWrkrData->libnet_handle == NULL) { + /* Initialize the libnet library. Root priviledges are required. + * this initializes a IPv4 socket to use for forging UDP packets. + */ + pWrkrData->libnet_handle = libnet_init( + LIBNET_RAW4, /* injection type */ + NULL, /* network interface */ + pWrkrData->errbuf); /* errbuf */ + + if(pWrkrData->libnet_handle == NULL) { + if(pData->bReportLibnetInitErr) { + LogError(0, RS_RET_ERR_LIBNET_INIT, "omudpsoof: error " + "initializing libnet - are you running as root?"); + pData->bReportLibnetInitErr = 0; + } + ABORT_FINALIZE(RS_RET_ERR_LIBNET_INIT); + } + } + DBGPRINTF("omudpspoof: libnit_init() ok\n"); + pData->bReportLibnetInitErr = 1; + + /* The remote address is not yet known and needs to be obtained */ + DBGPRINTF("omudpspoof trying resume for '%s'\n", pData->host); + memset(&hints, 0, sizeof(hints)); + /* port must be numeric, because config file syntax requires this */ + hints.ai_flags = AI_NUMERICSERV; + hints.ai_family = glbl.GetDefPFFamily(runModConf->pConf); + hints.ai_socktype = SOCK_DGRAM; + if((iErr = (getaddrinfo((char*)pData->host, (char*)getFwdPt(pData), &hints, &res))) != 0) { + DBGPRINTF("could not get addrinfo for hostname '%s':'%s': %d%s\n", + pData->host, getFwdPt(pData), iErr, gai_strerror(iErr)); + ABORT_FINALIZE(RS_RET_SUSPENDED); + } + DBGPRINTF("%s found, resuming.\n", pData->host); + pWrkrData->f_addr = res; + pWrkrData->pSockArray = net.create_udp_socket((uchar*)pData->host, NULL, 0, 0, 0, 0, NULL); + +finalize_it: + if(iRet != RS_RET_OK) { + if(pWrkrData->f_addr != NULL) { + freeaddrinfo(pWrkrData->f_addr); + pWrkrData->f_addr = NULL; + } + iRet = RS_RET_SUSPENDED; + } + + RETiRet; +} + +BEGINtryResume +CODESTARTtryResume + iRet = doTryResume(pWrkrData); +ENDtryResume + +BEGINdoAction + char *psz; /* temporary buffering */ + unsigned l; + int iMaxLine; +CODESTARTdoAction + CHKiRet(doTryResume(pWrkrData)); + + DBGPRINTF(" %s:%s/omudpspoof, src '%s', msg strt '%.256s'\n", pWrkrData->pData->host, + getFwdPt(pWrkrData->pData), ppString[1], ppString[0]); + + iMaxLine = glbl.GetMaxLine(runModConf->pConf); + psz = (char*) ppString[0]; + l = strlen((char*) psz); + if((int) l > iMaxLine) + l = iMaxLine; + + CHKiRet(UDPSend(pWrkrData, ppString[1], psz, l)); + +finalize_it: +ENDdoAction + + +static void +setInstParamDefaults(instanceData *pData) +{ + pData->tplName = NULL; + pData->sourcePortStart = DFLT_SOURCE_PORT_START; + pData->sourcePortEnd = DFLT_SOURCE_PORT_END; + pData->host = NULL; + pData->port = NULL; + pData->sourceTpl = (uchar*) strdup("RSYSLOG_omudpspoofDfltSourceTpl"); + pData->mtu = 1500; +} + +BEGINnewActInst + struct cnfparamvals *pvals; + uchar *tplToUse; + int i; +CODESTARTnewActInst + DBGPRINTF("newActInst (omudpspoof)\n"); + + pvals = nvlstGetParams(lst, &actpblk, NULL); + if(pvals == NULL) { + LogError(0, RS_RET_MISSING_CNFPARAMS, "omudpspoof: mandatory " + "parameters missing"); + ABORT_FINALIZE(RS_RET_MISSING_CNFPARAMS); + } + + if(Debug) { + dbgprintf("action param blk in omudpspoof:\n"); + cnfparamsPrint(&actpblk, pvals); + } + + CHKiRet(createInstance(&pData)); + setInstParamDefaults(pData); + + for(i = 0 ; i < actpblk.nParams ; ++i) { + if(!pvals[i].bUsed) + continue; + if(!strcmp(actpblk.descr[i].name, "target")) { + pData->host = (uchar*) es_str2cstr(pvals[i].val.d.estr, NULL); + } else if(!strcmp(actpblk.descr[i].name, "port")) { + pData->port = (uchar*) es_str2cstr(pvals[i].val.d.estr, NULL); + } else if(!strcmp(actpblk.descr[i].name, "sourcetemplate")) { + free(pData->sourceTpl); + pData->sourceTpl = (uchar*) es_str2cstr(pvals[i].val.d.estr, NULL); + } else if(!strcmp(actpblk.descr[i].name, "sourceport.start")) { + pData->sourcePortStart = (int) pvals[i].val.d.n; + } else if(!strcmp(actpblk.descr[i].name, "sourceport.end")) { + pData->sourcePortEnd = pvals[i].val.d.n; + } else if(!strcmp(actpblk.descr[i].name, "mtu")) { + pData->mtu = pvals[i].val.d.n; + } else if(!strcmp(actpblk.descr[i].name, "template")) { + pData->tplName = (uchar*)es_str2cstr(pvals[i].val.d.estr, NULL); + } else { + DBGPRINTF("omudpspoof: program error, non-handled " + "param '%s'\n", actpblk.descr[i].name); + } + } + CODE_STD_STRING_REQUESTnewActInst(2) + + tplToUse = ustrdup((pData->tplName == NULL) ? getDfltTpl() : pData->tplName); + CHKiRet(OMSRsetEntry(*ppOMSR, 0, tplToUse, OMSR_NO_RQD_TPL_OPTS)); + CHKiRet(OMSRsetEntry(*ppOMSR, 1, ustrdup(pData->sourceTpl), OMSR_NO_RQD_TPL_OPTS)); + +CODE_STD_FINALIZERnewActInst + cnfparamvalsDestruct(pvals, &actpblk); +ENDnewActInst + + +BEGINparseSelectorAct + uchar *sourceTpl; +CODESTARTparseSelectorAct +CODE_STD_STRING_REQUESTparseSelectorAct(2) + /* first check if this config line is actually for us */ + if(strncmp((char*) p, ":omudpspoof:", sizeof(":omudpspoof:") - 1)) { + ABORT_FINALIZE(RS_RET_CONFLINE_UNPROCESSED); + } + + /* ok, if we reach this point, we have something for us */ + p += sizeof(":omudpspoof:") - 1; /* eat indicator sequence (-1 because of '\0'!) */ + CHKiRet(createInstance(&pData)); + + sourceTpl = (cs.pszSourceNameTemplate == NULL) ? UCHAR_CONSTANT("RSYSLOG_omudpspoofDfltSourceTpl") + : cs.pszSourceNameTemplate; + + if(cs.pszTargetHost == NULL) { + LogError(0, NO_ERRCODE, "No $ActionOMUDPSpoofTargetHost given, can not continue " + "with this action."); + ABORT_FINALIZE(RS_RET_HOST_NOT_SPECIFIED); + } + + /* fill instance properties */ + CHKmalloc(pData->host = ustrdup(cs.pszTargetHost)); + if(cs.pszTargetPort == NULL) + pData->port = NULL; + else + CHKmalloc(pData->port = ustrdup(cs.pszTargetPort)); + CHKiRet(OMSRsetEntry(*ppOMSR, 1, ustrdup(sourceTpl), OMSR_NO_RQD_TPL_OPTS)); + pData->sourcePortStart = cs.iSourcePortStart; + pData->sourcePortEnd = cs.iSourcePortEnd; + + /* process template */ + CHKiRet(cflineParseTemplateName(&p, *ppOMSR, 0, OMSR_NO_RQD_TPL_OPTS, + (cs.tplName == NULL) ? (uchar*)"RSYSLOG_TraditionalForwardFormat" : cs.tplName)); + +CODE_STD_FINALIZERparseSelectorAct +ENDparseSelectorAct + + +/* a common function to free our configuration variables - used both on exit + * and on $ResetConfig processing. -- rgerhards, 2008-05-16 + */ +static void +freeConfigVars(void) +{ + free(cs.tplName); + cs.tplName = NULL; + free(cs.pszTargetHost); + cs.pszTargetHost = NULL; + free(cs.pszTargetPort); + cs.pszTargetPort = NULL; +} + + +BEGINmodExit +CODESTARTmodExit + /* destroy the libnet state needed for forged UDP sources */ + pthread_mutex_destroy(&mutLibnet); + /* release what we no longer need */ + objRelease(glbl, CORE_COMPONENT); + objRelease(net, LM_NET_FILENAME); + freeConfigVars(); +ENDmodExit + + +BEGINqueryEtryPt +CODESTARTqueryEtryPt +CODEqueryEtryPt_STD_OMOD_QUERIES +CODEqueryEtryPt_STD_OMOD8_QUERIES +CODEqueryEtryPt_STD_CONF2_OMOD_QUERIES +CODEqueryEtryPt_STD_CONF2_QUERIES +CODEqueryEtryPt_STD_CONF2_setModCnf_QUERIES +ENDqueryEtryPt + + +/* Reset config variables for this module to default values. + * rgerhards, 2008-03-28 + */ +static rsRetVal resetConfigVariables(uchar __attribute__((unused)) *pp, void __attribute__((unused)) *pVal) +{ + freeConfigVars(); + /* we now must reset all non-string values */ + cs.iSourcePortStart = DFLT_SOURCE_PORT_START; + cs.iSourcePortEnd = DFLT_SOURCE_PORT_END; + return RS_RET_OK; +} + + +BEGINmodInit() +CODESTARTmodInit +INITLegCnfVars + *ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */ +CODEmodInit_QueryRegCFSLineHdlr + CHKiRet(objUse(glbl, CORE_COMPONENT)); + CHKiRet(objUse(net,LM_NET_FILENAME)); + + pthread_mutex_init(&mutLibnet, NULL); + + CHKiRet(regCfSysLineHdlr((uchar *)"actionomudpspoofdefaulttemplate", 0, eCmdHdlrGetWord, + setLegacyDfltTpl, NULL, NULL)); + CHKiRet(regCfSysLineHdlr((uchar *)"actionomudpspoofsourcenametemplate", 0, eCmdHdlrGetWord, NULL, + &cs.pszSourceNameTemplate, NULL)); + CHKiRet(regCfSysLineHdlr((uchar *)"actionomudpspooftargethost", 0, eCmdHdlrGetWord, NULL, + &cs.pszTargetHost, NULL)); + CHKiRet(regCfSysLineHdlr((uchar *)"actionomudpspooftargetport", 0, eCmdHdlrGetWord, NULL, + &cs.pszTargetPort, NULL)); + CHKiRet(regCfSysLineHdlr((uchar *)"actionomudpspoofsourceportstart", 0, eCmdHdlrInt, NULL, + &cs.iSourcePortStart, NULL)); + CHKiRet(regCfSysLineHdlr((uchar *)"actionomudpspoofsourceportend", 0, eCmdHdlrInt, NULL, + &cs.iSourcePortEnd, NULL)); + CHKiRet(omsdRegCFSLineHdlr((uchar *)"resetconfigvariables", 1, eCmdHdlrCustomHandler, resetConfigVariables, + NULL, STD_LOADABLE_MODULE_ID)); +ENDmodInit + +/* vim:set ai: + */ |