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https://github.com/samba-team/samba.git
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acf9d61421
functions so we can funnel through some well known functions. Should help greatly with
malloc checking.
HEAD patch to follow.
Jeremy.
(This used to be commit 620f2e608f)
133 lines
2.8 KiB
C
133 lines
2.8 KiB
C
/*
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Unix SMB/CIFS implementation.
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Safe versions of getpw* calls
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Copyright (C) Andrew Bartlett 2002
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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static struct passwd *alloc_copy_passwd(const struct passwd *from)
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{
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struct passwd *ret = SMB_XMALLOC_P(struct passwd);
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ZERO_STRUCTP(ret);
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ret->pw_name = smb_xstrdup(from->pw_name);
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ret->pw_passwd = smb_xstrdup(from->pw_passwd);
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ret->pw_uid = from->pw_uid;
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ret->pw_gid = from->pw_gid;
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ret->pw_gecos = smb_xstrdup(from->pw_gecos);
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ret->pw_dir = smb_xstrdup(from->pw_dir);
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ret->pw_shell = smb_xstrdup(from->pw_shell);
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return ret;
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}
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void passwd_free (struct passwd **buf)
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{
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if (!*buf) {
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DEBUG(0, ("attempted double-free of allocated passwd\n"));
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return;
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}
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SAFE_FREE((*buf)->pw_name);
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SAFE_FREE((*buf)->pw_passwd);
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SAFE_FREE((*buf)->pw_gecos);
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SAFE_FREE((*buf)->pw_dir);
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SAFE_FREE((*buf)->pw_shell);
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SAFE_FREE(*buf);
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}
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#define PWNAMCACHE_SIZE 4
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static struct passwd *pwnam_cache[PWNAMCACHE_SIZE];
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static BOOL pwnam_cache_initialized = False;
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static void init_pwnam_cache(void)
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{
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int i;
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if (pwnam_cache_initialized)
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return;
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for (i=0; i<PWNAMCACHE_SIZE; i++)
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pwnam_cache[i] = NULL;
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pwnam_cache_initialized = True;
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return;
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}
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struct passwd *getpwnam_alloc(const char *name)
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{
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int i;
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struct passwd *temp;
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init_pwnam_cache();
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for (i=0; i<PWNAMCACHE_SIZE; i++) {
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if ((pwnam_cache[i] != NULL) &&
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(strcmp(name, pwnam_cache[i]->pw_name) == 0)) {
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DEBUG(10, ("Got %s from pwnam_cache\n", name));
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return alloc_copy_passwd(pwnam_cache[i]);
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}
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}
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temp = sys_getpwnam(name);
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if (!temp) {
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#if 0
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if (errno == ENOMEM) {
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/* what now? */
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}
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#endif
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return NULL;
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}
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for (i=0; i<PWNAMCACHE_SIZE; i++) {
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if (pwnam_cache[i] == NULL)
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break;
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}
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if (i == PWNAMCACHE_SIZE)
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i = rand() % PWNAMCACHE_SIZE;
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if (pwnam_cache[i] != NULL)
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passwd_free(&pwnam_cache[i]);
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pwnam_cache[i] = alloc_copy_passwd(temp);
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return alloc_copy_passwd(temp);
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}
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struct passwd *getpwuid_alloc(uid_t uid)
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{
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struct passwd *temp;
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temp = sys_getpwuid(uid);
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if (!temp) {
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#if 0
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if (errno == ENOMEM) {
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/* what now? */
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}
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#endif
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return NULL;
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}
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return alloc_copy_passwd(temp);
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}
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