lib/other/setgroups.c

   1 /*
   2 setgroups.c
   3 */
   4
   5 #include <errno.h>
   6 #include <unistd.h>
   7 #include <string.h>
   8 #include <grp.h>
   9
  10 int setgroups(int ngroups, const gid_t *gidset)
  11 {
  12         if(ngroups > 1) {
  13                 /* Supplementary groups not implemented */
  14                 errno= EINVAL;
  15                 return -1;
  16         }
  17
  18         if(ngroups == 1)
  19                 return setgid(gidset[0]);
  20
  21         return 0;
  22 }
  23
  24 int initgroups(const char *name, gid_t basegid)
  25 {
  26         struct group *gr;
  27         int r, found = 0;
  28         if((r = setgid(basegid)) < 0)
  29                 return r;
  30
  31         setgrent();
  32         while (!found && (gr = getgrent()) != NULL) {
  33                 char **mem;
  34                 for(mem = gr->gr_mem; mem && *mem; mem++) {
  35                         if(!strcmp(name, *mem)) {
  36                                 found = 1;
  37                                 break;
  38                         }
  39                 }
  40         }
  41         endgrent();
  42
  43         /* Because supplemental groups aren't implemented, this call
  44          * should fail if the user is in any supplemental groups.
  45          */
  46         if(found) {
  47                 errno = EINVAL;
  48                 return -1;
  49         }
  50
  51         return 0;
  52 }
  53