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/*
Unix SMB/CIFS implementation.
Samba utility functions
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 2001-2007
Copyright (C) Simo Sorce 2001
Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
Copyright (C) James Peach 2006
Copyright (c) 2020 Andreas Schneider <asn@samba.org>
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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "dynconfig/dynconfig.h"
#include "lib/util/util_paths.h"
#include "system/passwd.h"
/**
* @brief Returns an absolute path to a file in the Samba modules directory.
*
* @param name File to find, relative to MODULESDIR.
*
* @retval Pointer to a string containing the full path.
**/
char *modules_path(TALLOC_CTX *mem_ctx, const char *name)
{
return talloc_asprintf(mem_ctx, "%s/%s", get_dyn_MODULESDIR(), name);
}
/**
* @brief Returns an absolute path to a file in the Samba data directory.
*
* @param name File to find, relative to CODEPAGEDIR.
*
* @retval Pointer to a talloc'ed string containing the full path.
**/
char *data_path(TALLOC_CTX *mem_ctx, const char *name)
{
return talloc_asprintf(mem_ctx, "%s/%s", get_dyn_CODEPAGEDIR(), name);
}
/**
* @brief Returns the platform specific shared library extension.
*
* @retval Pointer to a const char * containing the extension.
**/
const char *shlib_ext(void)
{
return get_dyn_SHLIBEXT();
}
static char *get_user_home_dir(TALLOC_CTX *mem_ctx)
{
struct passwd pwd = {0};
struct passwd *pwdbuf = NULL;
char *buf = NULL;
char *out = NULL;
long int initlen;
size_t len;
int rc;
initlen = sysconf(_SC_GETPW_R_SIZE_MAX);
if (initlen == -1) {
len = 1024;
} else {
len = (size_t)initlen;
}
buf = talloc_size(mem_ctx, len);
if (buf == NULL) {
return NULL;
}
rc = getpwuid_r(getuid(), &pwd, buf, len, &pwdbuf);
while (rc == ERANGE) {
size_t newlen = 2 * len;
if (newlen < len) {
/* Overflow */
goto done;
}
len = newlen;
buf = talloc_realloc_size(mem_ctx, buf, len);
if (buf == NULL) {
goto done;
}
rc = getpwuid_r(getuid(), &pwd, buf, len, &pwdbuf);
}
if (rc != 0 || pwdbuf == NULL ) {
const char *szPath = getenv("HOME");
if (szPath == NULL) {
goto done;
}
len = strnlen(szPath, PATH_MAX);
if (len >= PATH_MAX) {
return NULL;
}
out = talloc_strdup(mem_ctx, szPath);
goto done;
}
out = talloc_strdup(mem_ctx, pwd.pw_dir);
done:
TALLOC_FREE(buf);
return out;
}
char *path_expand_tilde(TALLOC_CTX *mem_ctx, const char *d)
{
char *h = NULL, *r = NULL;
const char *p = NULL;
struct stat sb = {0};
int rc;
if (d[0] != '~') {
return talloc_strdup(mem_ctx, d);
}
d++;
/* handle ~user/path */
p = strchr(d, '/');
if (p != NULL && p > d) {
struct passwd *pw;
size_t s = p - d;
char u[128];
if (s >= sizeof(u)) {
return NULL;
}
memcpy(u, d, s);
u[s] = '\0';
pw = getpwnam(u);
if (pw == NULL) {
return NULL;
}
h = talloc_strdup(mem_ctx, pw->pw_dir);
} else {
p = d;
h = get_user_home_dir(mem_ctx);
}
if (h == NULL) {
return NULL;
}
rc = stat(h, &sb);
if (rc != 0) {
TALLOC_FREE(h);
return NULL;
}
r = talloc_asprintf(mem_ctx, "%s%s", h, p);
TALLOC_FREE(h);
return r;
}
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