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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 2 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"
static struct passwd *alloc_copy_passwd(const struct passwd *from)
{
struct passwd *ret = smb_xmalloc(sizeof(struct passwd));
ZERO_STRUCTP(ret);
ret->pw_name = smb_xstrdup(from->pw_name);
ret->pw_passwd = smb_xstrdup(from->pw_passwd);
ret->pw_uid = from->pw_uid;
ret->pw_gid = from->pw_gid;
ret->pw_gecos = smb_xstrdup(from->pw_gecos);
ret->pw_dir = smb_xstrdup(from->pw_dir);
ret->pw_shell = smb_xstrdup(from->pw_shell);
return ret;
}
void passwd_free (struct passwd **buf)
{
if (!*buf) {
DEBUG(0, ("attempted double-free of allocated passwd\n"));
return;
}
SAFE_FREE((*buf)->pw_name);
SAFE_FREE((*buf)->pw_passwd);
SAFE_FREE((*buf)->pw_gecos);
SAFE_FREE((*buf)->pw_dir);
SAFE_FREE((*buf)->pw_shell);
SAFE_FREE(*buf);
}
#define PWNAMCACHE_SIZE 4
static struct passwd *pwnam_cache[PWNAMCACHE_SIZE];
static BOOL pwnam_cache_initialized = False;
static void init_pwnam_cache(void)
{
int i;
if (pwnam_cache_initialized)
return;
for (i=0; i<PWNAMCACHE_SIZE; i++)
pwnam_cache[i] = NULL;
pwnam_cache_initialized = True;
return;
}
struct passwd *getpwnam_alloc(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 alloc_copy_passwd(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)
passwd_free(&pwnam_cache[i]);
pwnam_cache[i] = alloc_copy_passwd(temp);
return alloc_copy_passwd(temp);
}
struct passwd *getpwuid_alloc(uid_t uid)
{
struct passwd *temp;
temp = sys_getpwuid(uid);
if (!temp) {
#if 0
if (errno == ENOMEM) {
/* what now? */
}
#endif
return NULL;
}
return alloc_copy_passwd(temp);
}
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