Line data    Source code

       1             : /* 
       2             :    Unix SMB/CIFS implementation.
       3             :    Samba utility functions
       4             :    Copyright (C) Andrew Tridgell 1992-1998
       5             :    Copyright (C) Jeremy Allison 2001-2007
       6             :    Copyright (C) Simo Sorce 2001
       7             :    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
       8             :    Copyright (C) James Peach 2006
       9             :    Copyright (c) 2020      Andreas Schneider <asn@samba.org>
      10             : 
      11             :    This program is free software; you can redistribute it and/or modify
      12             :    it under the terms of the GNU General Public License as published by
      13             :    the Free Software Foundation; either version 3 of the License, or
      14             :    (at your option) any later version.
      15             : 
      16             :    This program is distributed in the hope that it will be useful,
      17             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      18             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      19             :    GNU General Public License for more details.
      20             : 
      21             :    You should have received a copy of the GNU General Public License
      22             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      23             : */
      24             : 
      25             : #include "replace.h"
      26             : #include "dynconfig/dynconfig.h"
      27             : #include "lib/util/util_paths.h"
      28             : #include "system/passwd.h"
      29             : #include "system/filesys.h"
      30             : 
      31             : /**
      32             :  * @brief Returns an absolute path to a file in the Samba modules directory.
      33             :  *
      34             :  * @param name File to find, relative to MODULESDIR.
      35             :  *
      36             :  * @retval Pointer to a string containing the full path.
      37             :  **/
      38             : 
      39      509936 : char *modules_path(TALLOC_CTX *mem_ctx, const char *name)
      40             : {
      41      509936 :         return talloc_asprintf(mem_ctx, "%s/%s", get_dyn_MODULESDIR(), name);
      42             : }
      43             : 
      44             : /**
      45             :  * @brief Returns an absolute path to a file in the Samba data directory.
      46             :  *
      47             :  * @param name File to find, relative to CODEPAGEDIR.
      48             :  *
      49             :  * @retval Pointer to a talloc'ed string containing the full path.
      50             :  **/
      51             : 
      52           0 : char *data_path(TALLOC_CTX *mem_ctx, const char *name)
      53             : {
      54           0 :         return talloc_asprintf(mem_ctx, "%s/%s", get_dyn_CODEPAGEDIR(), name);
      55             : }
      56             : 
      57             : /**
      58             :  * @brief Returns the platform specific shared library extension.
      59             :  *
      60             :  * @retval Pointer to a const char * containing the extension.
      61             :  **/
      62             : 
      63      154423 : const char *shlib_ext(void)
      64             : {
      65      154423 :         return get_dyn_SHLIBEXT();
      66             : }
      67             : 
      68           3 : static char *get_user_home_dir(TALLOC_CTX *mem_ctx)
      69             : {
      70           3 :         struct passwd pwd = {0};
      71           3 :         struct passwd *pwdbuf = NULL;
      72           3 :         char *buf = NULL;
      73           3 :         char *out = NULL;
      74           3 :         long int initlen;
      75           3 :         size_t len;
      76           3 :         int rc;
      77             : 
      78           3 :         initlen = sysconf(_SC_GETPW_R_SIZE_MAX);
      79           3 :         if (initlen == -1) {
      80           0 :                 len = 1024;
      81             :         } else {
      82           3 :                 len = (size_t)initlen;
      83             :         }
      84           3 :         buf = talloc_size(mem_ctx, len);
      85           3 :         if (buf == NULL) {
      86           0 :                 return NULL;
      87             :         }
      88             : 
      89           3 :         rc = getpwuid_r(getuid(), &pwd, buf, len, &pwdbuf);
      90           3 :         while (rc == ERANGE) {
      91           0 :                 size_t newlen = 2 * len;
      92           0 :                 if (newlen < len) {
      93             :                         /* Overflow */
      94           0 :                         goto done;
      95             :                 }
      96           0 :                 len = newlen;
      97           0 :                 buf = talloc_realloc_size(mem_ctx, buf, len);
      98           0 :                 if (buf == NULL) {
      99           0 :                         goto done;
     100             :                 }
     101           0 :                 rc = getpwuid_r(getuid(), &pwd, buf, len, &pwdbuf);
     102             :         }
     103           3 :         if (rc != 0 || pwdbuf == NULL ) {
     104           0 :                 const char *szPath = getenv("HOME");
     105           0 :                 if (szPath == NULL) {
     106           0 :                         goto done;
     107             :                 }
     108           0 :                 len = strnlen(szPath, PATH_MAX);
     109           0 :                 if (len >= PATH_MAX) {
     110           0 :                         goto done;
     111             :                 }
     112           0 :                 out = talloc_strdup(mem_ctx, szPath);
     113           0 :                 goto done;
     114             :         }
     115             : 
     116           3 :         out = talloc_strdup(mem_ctx, pwd.pw_dir);
     117           3 : done:
     118           3 :         TALLOC_FREE(buf);
     119           0 :         return out;
     120             : }
     121             : 
     122           4 : char *path_expand_tilde(TALLOC_CTX *mem_ctx, const char *d)
     123             : {
     124           4 :         char *h = NULL, *r = NULL;
     125           4 :         const char *p = NULL;
     126           4 :         struct stat sb = {0};
     127           4 :         int rc;
     128             : 
     129           4 :         if (d[0] != '~') {
     130           1 :                 return talloc_strdup(mem_ctx, d);
     131             :         }
     132           3 :         d++;
     133             : 
     134             :         /* handle ~user/path */
     135           3 :         p = strchr(d, '/');
     136           3 :         if (p != NULL && p > d) {
     137           1 :                 struct passwd *pw;
     138           1 :                 size_t s = p - d;
     139           1 :                 char u[128];
     140             : 
     141           1 :                 if (s >= sizeof(u)) {
     142           0 :                         return NULL;
     143             :                 }
     144           1 :                 memcpy(u, d, s);
     145           1 :                 u[s] = '\0';
     146             : 
     147           1 :                 pw = getpwnam(u);
     148           1 :                 if (pw == NULL) {
     149           0 :                         return NULL;
     150             :                 }
     151           1 :                 h = talloc_strdup(mem_ctx, pw->pw_dir);
     152             :         } else {
     153           2 :                 p = d;
     154           2 :                 h = get_user_home_dir(mem_ctx);
     155             :         }
     156           3 :         if (h == NULL) {
     157           0 :                 return NULL;
     158             :         }
     159             : 
     160           3 :         rc = stat(h, &sb);
     161           3 :         if (rc != 0) {
     162           0 :                 TALLOC_FREE(h);
     163           0 :                 return NULL;
     164             :         }
     165             : 
     166           3 :         r = talloc_asprintf(mem_ctx, "%s%s", h, p);
     167           3 :         TALLOC_FREE(h);
     168             : 
     169           3 :         return r;
     170             : }