Line data    Source code

       1             : // Snap Websites Server -- like shell `chown <user>:<group> <path+file>`
       2             : // Copyright (c) 2016-2019  Made to Order Software Corp.  All Rights Reserved
       3             : //
       4             : // This program is free software; you can redistribute it and/or modify
       5             : // it under the terms of the GNU General Public License as published by
       6             : // the Free Software Foundation; either version 2 of the License, or
       7             : // (at your option) any later version.
       8             : //
       9             : // This program is distributed in the hope that it will be useful,
      10             : // but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12             : // GNU General Public License for more details.
      13             : //
      14             : // You should have received a copy of the GNU General Public License
      15             : // along with this program; if not, write to the Free Software
      16             : // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
      17             : 
      18             : 
      19             : // self
      20             : //
      21             : #include "snapwebsites/chownnm.h"
      22             : 
      23             : 
      24             : // snapwebsite lib
      25             : //
      26             : #include "snapwebsites/log.h"
      27             : 
      28             : 
      29             : // C lib
      30             : //
      31             : #include <grp.h>
      32             : #include <pwd.h>
      33             : #include <unistd.h>
      34             : 
      35             : 
      36             : // last include
      37             : //
      38             : #include <snapdev/poison.h>
      39             : 
      40             : 
      41             : namespace snap
      42             : {
      43             : 
      44             : 
      45             : /** \brief Set the owner and group of a file or directory.
      46             :  *
      47             :  * This function determines the user identifier and group identifier
      48             :  * from the specified names and use them to call chown().
      49             :  *
      50             :  * The function can fail if an identifier for the user or group names
      51             :  * cannot be determined.
      52             :  *
      53             :  * The function may fail if the path is invalid or permissions do not
      54             :  * allow for ownership modifications.
      55             :  *
      56             :  * \param[in] path  The path to the file or directory to change.
      57             :  * \param[in] user_name  The name of the user.
      58             :  * \param[in] group_name  The name of the group.
      59             :  *
      60             :  * \return 0 if chown succeeded,
      61             :  *         -1 if an error occurs (i.e. permissions denied, unknown user/group)
      62             :  *         and errno is set accordingly.
      63             :  */
      64           1 : int chownnm(std::string const & path
      65             :           , std::string const & user_name
      66             :           , std::string const & group_name)
      67             : {
      68           1 :     uid_t uid(-1);
      69           1 :     gid_t gid(-1);
      70             : 
      71             :     // user name specified?
      72             :     //
      73           1 :     if(!user_name.empty())
      74             :     {
      75           1 :         struct passwd const * pwd(getpwnam(user_name.c_str()));
      76           1 :         if(pwd == nullptr)
      77             :         {
      78           0 :             return -1;
      79             :         }
      80           1 :         uid = pwd->pw_uid;
      81             :     }
      82             : 
      83             :     // group name specified?
      84             :     //
      85           1 :     if(!group_name.empty())
      86             :     {
      87           1 :         struct group const * grp(getgrnam(group_name.c_str()));
      88           1 :         if(grp == nullptr)
      89             :         {
      90           0 :             return -1;
      91             :         }
      92           1 :         gid = grp->gr_gid;
      93             :     }
      94             : 
      95           1 :     if(uid != static_cast<uid_t>(-1)
      96           0 :     || gid != static_cast<gid_t>(-1))
      97             :     {
      98           1 :         return chown(path.c_str(), uid, gid);
      99             :     }
     100             : 
     101             :     // in case both are undefined (it happens in the mkdir_p() function)
     102             :     //
     103           0 :     return 0;
     104             : }
     105             : 
     106             : 
     107           1 : int chownnm(QString const & path, QString const & user_name, QString const & group_name)
     108             : {
     109           2 :     return chownnm(path.toUtf8().data()
     110           2 :                  , user_name.toUtf8().data()
     111           3 :                  , group_name.toUtf8().data());
     112             : }
     113             : 
     114             : 
     115           1 : int chownnm(char const * path, char const * user_name, char const * group_name)
     116             : {
     117           2 :     return chownnm(path == nullptr ? std::string() : std::string(path)
     118           2 :                  , user_name == nullptr ? std::string() : std::string(user_name)
     119           3 :                  , group_name == nullptr ? std::string() : std::string(group_name));
     120             : }
     121             : 
     122             : 
     123           6 : } // snap namespace
     124             : // vim: ts=4 sw=4 et