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/*----------------------------------------------------------------------------*/
/* Xymon monitor library. */
/* */
/* This is a library module for Xymon, responsible for loading the */
/* client-local.cfg file into memory and finding the proper host entry. */
/* */
/* Copyright (C) 2006-2011 Henrik Storner <henrik@hswn.dk> */
/* */
/* This program is released under the GNU General Public License (GPL), */
/* version 2. See the file "COPYING" for details. */
/* */
/*----------------------------------------------------------------------------*/
static char rcsid[] = "$Id: clientlocal.c 8069 2019-07-23 15:29:06Z jccleaver $";
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#define PCRE2_CODE_UNIT_WIDTH 8
#include <pcre2.h>
#include "libxymon.h"
typedef struct clientconfig_t {
pcre2_code *hostptn, *classptn, *osptn;
strbuffer_t *config;
struct clientconfig_t *next;
} clientconfig_t;
static clientconfig_t *cchead = NULL;
typedef struct cctree_t {
char *hostname;
char *config;
} cctree_t;
static void *cctree = NULL;
/* Feature flag: Set to 1 to merge all matching clientconfig entries into one */
static int ccmergemode = 0;
void load_clientconfig(void)
{
static char *configfn = NULL;
static void *clientconflist = NULL;
FILE *fd;
strbuffer_t *buf;
clientconfig_t *cctail = NULL;
if (!configfn) {
unsigned int configfn_buflen = strlen(xgetenv("XYMONHOME"))+ strlen("/etc/client-local.cfg") + 1;
configfn = (char *)malloc(configfn_buflen);
snprintf(configfn, configfn_buflen, "%s/etc/client-local.cfg", xgetenv("XYMONHOME"));
}
/* First check if there were no modifications at all */
if (clientconflist) {
if (!stackfmodified(clientconflist)){
dbgprintf("No files modified, skipping reload of %s\n", configfn);
return;
}
else {
stackfclist(&clientconflist);
clientconflist = NULL;
}
}
/* Must reload the config, clear out old cache data */
if (cchead) {
clientconfig_t *walk, *zombie;
walk = cchead;
while (walk) {
zombie = walk; walk = walk->next;
if (zombie->hostptn) freeregex(zombie->hostptn);
if (zombie->classptn) freeregex(zombie->classptn);
if (zombie->osptn) freeregex(zombie->osptn);
if (zombie->config) freestrbuffer(zombie->config);
xfree(zombie);
}
cchead = NULL;
}
if (cctree) {
xtreePos_t handle;
cctree_t *rec;
handle = xtreeFirst(cctree);
while (handle != xtreeEnd(cctree)) {
rec = xtreeData(cctree, handle);
xfree(rec->hostname);
xfree(rec->config);
handle = xtreeNext(cctree, handle);
}
xtreeDestroy(cctree);
cctree = NULL;
}
buf = newstrbuffer(0);
fd = stackfopen(configfn, "r", &clientconflist); if (!fd) return;
while (stackfgets(buf, NULL)) {
static int insection = 0;
char *p, *ptn;
/* Ignore comments and blank lines */
p = STRBUF(buf); p += strspn(p, " \t\r\n"); if ((*p == '#') || (*p == '\0')) continue;
if (insection) {
if (*p != '[') {
if (cctail) {
if (!cctail->config) cctail->config = newstrbuffer(0);
addtostrbuffer(cctail->config, buf);
}
}
else {
insection = 0;
}
}
if (!insection) {
if (*STRBUF(buf) == '[') {
pcre2_code *hostptn = NULL, *classptn = NULL, *osptn = NULL;
clientconfig_t *newrec;
p = STRBUF(buf) + strcspn(STRBUF(buf), "\r\n");
if (p == STRBUF(buf)) errprintf("Garbled block in client-local.cfg\n");
else if (*(p-1) == ']') {
*(p-1) = '\0'; strbufferrecalc(buf);
ptn = STRBUF(buf) + 1;
if (strncasecmp(ptn, "host=", 5) == 0) {
ptn += 5; if (*ptn == '%') ptn++;
hostptn = compileregex((strcmp(ptn, "*") == 0) ? "." : ptn);
if (!hostptn) errprintf("Invalid host pattern in client-local.cfg: %s\n", ptn);
}
else if (strncasecmp(ptn, "class=", 6) == 0) {
ptn += 6; if (*ptn == '%') ptn++;
classptn = compileregex((strcmp(ptn, "*") == 0) ? "." : ptn);
if (!classptn) errprintf("Invalid class pattern in client-local.cfg: %s\n", ptn);
}
else if (strncasecmp(ptn, "os=", 3) == 0) {
ptn += 3; if (*ptn == '%') ptn++;
osptn = compileregex((strcmp(ptn, "*") == 0) ? "." : ptn);
if (!osptn) errprintf("Invalid os pattern in client-local.cfg: %s\n", ptn);
}
else if (*(ptn + strlen(ptn) - 1) == '*') {
/* It's a "blabla*" */
*(ptn-1) = '^'; /* Ok, we know there is a '[' first */
strbufferchop(buf, 1);
hostptn = compileregex(ptn-1);
}
else {
/* Old-style matching, must anchor it and match on all possible patterns */
*(ptn-1) = '^'; /* Ok, we know there is a '[' first */
addtobuffer(buf, "$");
/* Compile it three times, because we free each expression when reloading the config */
hostptn = compileregex(ptn-1);
classptn = compileregex(ptn-1);
osptn = compileregex(ptn-1);
}
if (hostptn || classptn || osptn) {
newrec = (clientconfig_t *)calloc(1, sizeof(clientconfig_t));
newrec->hostptn = hostptn;
newrec->classptn = classptn;
newrec->osptn = osptn;
newrec->next = NULL;
if (!cchead) {
cchead = cctail = newrec;
}
else {
cctail->next = newrec;
cctail = newrec;
}
insection = 1;
}
}
}
}
}
stackfclose(fd);
freestrbuffer(buf);
}
char *get_clientconfig(char *hostname, char *hostclass, char *hostos)
{
xtreePos_t handle;
cctree_t *rec = NULL;
if (!cchead) return NULL;
if (!cctree) cctree = xtreeNew(strcasecmp);
handle = xtreeFind(cctree, hostname);
if (handle == xtreeEnd(cctree)) {
strbuffer_t *config = newstrbuffer(0);
clientconfig_t *walk = cchead;
if (!ccmergemode) {
/* Old-style: Find the first match of hostname, classname or osname - in that priority */
clientconfig_t *hostmatch = NULL, *classmatch = NULL, *osmatch = NULL;
while (walk && !hostmatch) { /* Can stop if we find a hostmatch, since those are priority 1 */
if (walk->hostptn && !hostmatch && matchregex(hostname, walk->hostptn)) hostmatch = walk;
else if (walk->classptn && !classmatch && matchregex(hostclass, walk->classptn)) classmatch = walk;
else if (walk->osptn && !osmatch && matchregex(hostos, walk->osptn)) osmatch = walk;
walk = walk->next;
}
if (hostmatch && hostmatch->config) addtostrbuffer(config, hostmatch->config);
else if (classmatch && classmatch->config) addtostrbuffer(config, classmatch->config);
else if (osmatch && osmatch->config) addtostrbuffer(config, osmatch->config);
}
else {
/* Merge mode: Merge all matching entries into one */
while (walk) {
if ( (walk->hostptn && matchregex(hostname, walk->hostptn)) ||
(walk->classptn && matchregex(hostclass, walk->classptn)) ||
(walk->osptn && matchregex(hostos, walk->osptn)) ) {
if (walk->config) addtostrbuffer(config, walk->config);
}
walk = walk->next;
}
}
rec = (cctree_t *)calloc(1, sizeof(cctree_t));
rec->hostname = strdup(hostname);
rec->config = grabstrbuffer(config);
xtreeAdd(cctree, rec->hostname, rec);
}
else {
rec = (cctree_t *)xtreeData(cctree, handle);
}
return (rec ? rec->config : NULL);
}
void set_clientlocal_mergemode(int onoff)
{
ccmergemode = (onoff != 0);
}
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