/* Set the module search path after changing it */
static void
setpath(struct pathhead *pathq)
{
char *newpath;
if (miblen == 0)
getmib();
if ((newpath = qstring(pathq)) == NULL) {
errno = ENOMEM;
err(1, "building path string");
}
if (sysctl(mib, miblen, NULL, NULL, newpath, strlen(newpath)+1) == -1)
err(1, "setting path: sysctl(%s)", pathctl);
if (modpath != NULL)
free(modpath);
modpath = newpath;
}
/* Get the current module search path */
static void
getpath(void)
{
char *path;
size_t sz;
if (modpath != NULL) {
free(modpath);
modpath = NULL;
}
if (miblen == 0)
getmib();
if (sysctl(mib, miblen, NULL, &sz, NULL, 0) == -1)
err(1, "getting path: sysctl(%s) - size only", pathctl);
if ((path = malloc(sz + 1)) == NULL) {
errno = ENOMEM;
err(1, "allocating %lu bytes for the path",
(unsigned long)sz+1);
}
if (sysctl(mib, miblen, path, &sz, NULL, 0) == -1)
err(1, "getting path: sysctl(%s)", pathctl);
modpath = path;
}
/*
* get MIB-II statistics. It maintaines a simple cache which buffers the last
* read block of MIB statistics (which may contain the whole table). It calls
* *comp to compare every entry with an entry pointed by arg. *comp should
* return 0 if comparison is successful. Req_type may be GET_FIRST, GET_EXACT,
* GET_NEXT. If search is successful getMibstat returns 0, otherwise 1.
*/
int
getMibstat(mibgroup_e grid, void *resp, size_t entrysize,
req_e req_type, int (*comp) (void *, void *), void *arg)
{
int ret, rc = -1, mibgr, mibtb, cache_valid;
size_t length;
mibcache *cachep;
found_e result = NOT_FOUND;
void *ep;
/*
* We assume that Mibcache is initialized in mibgroup_e enum order so we
* don't check the validity of index here.
*/
DEBUGMSGTL(("kernel_sunos5", "getMibstat (%d, *, %d, %d, *, *)\n",
grid, entrysize, req_type));
cachep = &Mibcache[grid];
mibgr = Mibmap[grid].group;
mibtb = Mibmap[grid].table;
if (cachep->cache_addr == (void *) -1) /* Hasn't been initialized yet */
init_mibcache_element(cachep);
if (cachep->cache_size == 0) { /* Memory allocation problems */
cachep->cache_addr = resp; /* So use caller supplied address instead of cache */
cachep->cache_size = entrysize;
cachep->cache_last_found = 0;
}
if (req_type != GET_NEXT)
cachep->cache_last_found = 0;
cache_valid = (cachep->cache_time > 0);
DEBUGMSGTL(("kernel_sunos5","... cache_valid %d time %ld ttl %d now %ld\n",
cache_valid, cachep->cache_time, cachep->cache_ttl,
time(NULL)));
if (cache_valid) {
/*
* Is it really?
*/
if (cachep->cache_comp != (void *)comp || cachep->cache_arg != arg) {
cache_valid = 0; /* Nope. */
}
}
if (cache_valid) {
/*
* Entry is valid, let's try to find a match
*/
if (req_type == GET_NEXT) {
result = getentry(req_type,
(void *)((char *)cachep->cache_addr +
(cachep->cache_last_found * entrysize)),
cachep->cache_length -
(cachep->cache_last_found * entrysize),
entrysize, &ep, comp, arg);
} else {
result = getentry(req_type, cachep->cache_addr,
cachep->cache_length, entrysize, &ep, comp,
arg);
}
}
if ((cache_valid == 0) || (result == NOT_FOUND) ||
(result == NEED_NEXT && cachep->cache_flags & CACHE_MOREDATA)) {
/*
* Either the cache is old, or we haven't found anything, or need the
* next item which hasn't been read yet. In any case, fill the cache
* up and try to find our entry.
*/
if (grid == MIB_INTERFACES) {
rc = getif((mib2_ifEntry_t *) cachep->cache_addr,
cachep->cache_size, req_type,
(mib2_ifEntry_t *) & ep, &length, comp, arg);
} else {
rc = getmib(mibgr, mibtb, cachep->cache_addr,
cachep->cache_size, entrysize, req_type, &ep,
&length, comp, arg);
}
if (rc >= 0) { /* Cache has been filled up */
cachep->cache_time = cachep->cache_ttl;
cachep->cache_length = length;
if (rc == 1) /* Found but there are more unread data */
cachep->cache_flags |= CACHE_MOREDATA;
else
cachep->cache_flags &= ~CACHE_MOREDATA;
cachep->cache_comp = (void *) comp;
cachep->cache_arg = arg;
} else {
cachep->cache_comp = NULL;
cachep->cache_arg = NULL;
}
}
DEBUGMSGTL(("kernel_sunos5", "... result %d rc %d\n", result, rc));
if (result == FOUND || rc == 0 || rc == 1) {
/*
* Entry has been found, deliver it
*/
if (resp != NULL) {
memcpy(resp, ep, entrysize);
}
ret = 0;
cachep->cache_last_found =
((char *)ep - (char *)cachep->cache_addr) / entrysize;
} else {
ret = 1; /* Not found */
}
DEBUGMSGTL(("kernel_sunos5", "... getMibstat returns %d\n", ret));
return ret;
}
