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nwrap: Add a hash table to the nwrap structure

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The hash table will hold hostnames and ips internally. The new
environment variable which is introduced is NSS_WRAPPER_MAX_HOSTENTS. It
sets the maximum count of hostent (hostnames and ips) structs which the
hash table can hold.

Signed-off-by: Robin Hack <hack.robin@gmail.com>
Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
This commit is contained in:
Robin Hack 2015-07-15 15:01:48 +02:00 committed by Michael Adam
parent f3da6e4905
commit 15c14536d0
1 changed files with 39 additions and 0 deletions
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39
lib/nss_wrapper/nss_wrapper.c
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@ -50,6 +50,7 @@
#include <unistd.h>
#include <ctype.h>
#include <search.h>
#include <assert.h>
/*
@ -680,15 +681,25 @@ struct nwrap_addrdata {
char *h_addr_ptrs[2]; /* host_addr pointer + NULL */
};
static size_t max_hostents = 100;
struct nwrap_entdata {
struct nwrap_addrdata *addr;
struct hostent ht;
struct nwrap_vector nwrap_addrdata;
ssize_t aliases_count;
struct nwrap_entdata *ed_next;
struct nwrap_entdata *ed_tail;
};
struct nwrap_he {
struct nwrap_cache *cache;
struct nwrap_entdata *list;
struct nwrap_vector entdata;
int num;
int idx;
};
@ -1415,10 +1426,36 @@ static void nwrap_backend_init(struct nwrap_main *r)
static void nwrap_init(void)
{
static bool initialized;
const char *env;
char *endptr;
size_t max_hostents_tmp;
if (initialized) return;
initialized = true;
env = getenv("NSS_WRAPPER_MAX_HOSTENTS");
if (env != NULL) {
max_hostents_tmp = (size_t)strtol(env, &endptr, 10);
if (((env != '\0') && (endptr == '\0')) ||
(max_hostents_tmp == 0)) {
NWRAP_LOG(NWRAP_LOG_DEBUG,
"Error parsing NSS_WRAPPER_MAX_HOSTENTS "
"value or value is too small. "
"Using default value: %lu.",
max_hostents);
} else {
max_hostents = max_hostents_tmp;
}
}
/* Initialize hash table */
NWRAP_LOG(NWRAP_LOG_DEBUG,
"Initializing hash table of size %lu items.", max_hostents);
if (hcreate(max_hostents) == 0) {
NWRAP_LOG(NWRAP_LOG_ERROR,
"Failed to initialize hash table");
return;
}
nwrap_main_global = &__nwrap_main_global;
nwrap_libc_init(nwrap_main_global);
@ -4915,4 +4952,6 @@ void nwrap_destructor(void)
SAFE_FREE(nwrap_he_global.list);
nwrap_he_global.num = 0;
}
hdestroy();
}