Line data    Source code

       1             : /*
       2             :    Wrapper for smbspool to test Device URI in argv[0]
       3             : 
       4             :    Copyright (C) Bryan Mason 2019
       5             : 
       6             :    This program is free software; you can redistribute it and/or modify
       7             :    it under the terms of the GNU General Public License as published by
       8             :    the Free Software Foundation; either version 3 of the License, or
       9             :    (at your option) any later version.
      10             : 
      11             :    This program is distributed in the hope that it will be useful,
      12             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14             :    GNU General Public License for more details.
      15             : 
      16             :    You should have received a copy of the GNU General Public License
      17             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      18             : */
      19             : 
      20             : #include <unistd.h>
      21             : #include <stdlib.h>
      22             : #include <errno.h>
      23             : 
      24             : /*
      25             :  * Before calling a backend like smbspool, CUPS will set argv[0] to
      26             :  * the Device URI.  This program wraps a program like smbspool and
      27             :  * sets argv[0] to the device URI before exec()ing the actual backend
      28             :  * program.
      29             :  */
      30             : 
      31           4 : int main(int argc, char *argv[], char *envp[])
      32             : {
      33             :         char **new_argv;
      34             :         char *exec_path;
      35             :         int a;
      36             :         int rv;
      37             : /*
      38             :  * Expected parameters:
      39             :  *
      40             :  * smbspool_argv_wrapper smbspool uri job user title copies opts file(s)
      41             :  * argv[0]             1        2   3   4    5     6      7    8
      42             :  *
      43             :  */
      44             :         /* Allocate memory for the new arguments (exit on failure). */
      45           4 :         new_argv = calloc(argc, sizeof(char *));
      46           4 :         if (new_argv == 0) {
      47           0 :                 exit(ENOMEM);
      48             :         }
      49             : 
      50             :         /* Save the path to the smbspool executable */
      51           4 :         exec_path = argv[1];
      52             : 
      53             :         /*
      54             :          * Shift the rest of the args so smbspool is called with:
      55             :          *
      56             :          * uri     job user title copies opts file(s)
      57             :          * argv[0] 1   2    3     4      5    6
      58             :          */
      59             : 
      60          30 :         for (a = 2; a < argc; a++) {
      61          26 :                 new_argv[a-2] = argv[a];
      62             :         }
      63             : 
      64             :         /* Execute smbspool with new arguments */
      65           4 :         rv = execve(exec_path, new_argv, envp);
      66           4 :         if (rv == -1) {
      67           0 :                 exit(errno);
      68             :         }
      69             : 
      70             :         /* Avoid compiler error/warning */
      71           4 :         return 0;
      72             : }