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/*
Unix SMB/CIFS implementation.
Safe versions of getpw* calls
Copyright (C) Andrew Bartlett 2002
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
struct passwd *tcopy_passwd(TALLOC_CTX *mem_ctx, const struct passwd *from)
{
struct passwd *ret = TALLOC_P(mem_ctx, struct passwd);
if (!ret) {
return NULL;
}
ret->pw_name = talloc_strdup(ret, from->pw_name);
ret->pw_passwd = talloc_strdup(ret, from->pw_passwd);
ret->pw_uid = from->pw_uid;
ret->pw_gid = from->pw_gid;
ret->pw_gecos = talloc_strdup(ret, from->pw_gecos);
ret->pw_dir = talloc_strdup(ret, from->pw_dir);
ret->pw_shell = talloc_strdup(ret, from->pw_shell);
return ret;
}
#define PWNAMCACHE_SIZE 4
static struct passwd **pwnam_cache = NULL;
static void init_pwnam_cache(void)
{
if (pwnam_cache != NULL)
return;
pwnam_cache = TALLOC_ZERO_ARRAY(NULL, struct passwd *,
PWNAMCACHE_SIZE);
if (pwnam_cache == NULL) {
smb_panic("Could not init pwnam_cache");
}
return;
}
void flush_pwnam_cache(void)
{
TALLOC_FREE(pwnam_cache);
pwnam_cache = NULL;
init_pwnam_cache();
}
struct passwd *getpwnam_alloc(TALLOC_CTX *mem_ctx, const char *name)
{
int i;
struct passwd *temp;
init_pwnam_cache();
for (i=0; i<PWNAMCACHE_SIZE; i++) {
if ((pwnam_cache[i] != NULL) &&
(strcmp(name, pwnam_cache[i]->pw_name) == 0)) {
DEBUG(10, ("Got %s from pwnam_cache\n", name));
return tcopy_passwd(mem_ctx, pwnam_cache[i]);
}
}
temp = sys_getpwnam(name);
if (!temp) {
#if 0
if (errno == ENOMEM) {
/* what now? */
}
#endif
return NULL;
}
for (i=0; i<PWNAMCACHE_SIZE; i++) {
if (pwnam_cache[i] == NULL)
break;
}
if (i == PWNAMCACHE_SIZE)
i = rand() % PWNAMCACHE_SIZE;
if (pwnam_cache[i] != NULL) {
/* Remove this old cache entry, from the cache. We
* use talloc_unlink here because we want to be very
* clear which referece we are removing */
talloc_unlink(pwnam_cache, pwnam_cache[i]);
}
pwnam_cache[i] = tcopy_passwd(pwnam_cache, temp);
return tcopy_passwd(mem_ctx, temp);
}
struct passwd *getpwuid_alloc(TALLOC_CTX *mem_ctx, uid_t uid)
{
struct passwd *temp;
temp = sys_getpwuid(uid);
if (!temp) {
#if 0
if (errno == ENOMEM) {
/* what now? */
}
#endif
return NULL;
}
return tcopy_passwd(mem_ctx, temp);
}
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