compat/initgroups.c

   1 #include "squid.h"
   2 #include "compat/initgroups.h"
   3
   4 #if HAVE_GRP_H
   5 #include <grp.h>
   6 #endif
   7 #if HAVE_UNISTD_H
   8 #include <unistd.h>
   9 #endif
  10 #if HAVE_STRING_H
  11 #include <string.h>
  12 #endif
  13 #if HAVE_STRINGS_H
  14 #include <strings.h>
  15 #endif
  16 #if HAVE_LIMITS_H
  17 #include <limits.h>
  18 #endif
  19
  20 int initgroups(const char *name, gid_t basegid)
  21 {
  22 #if HAVE_SETGROUPS
  23 #ifndef NGROUPS_MAX
  24 #define NGROUPS_MAX 16
  25 #endif
  26
  27     gid_t groups[NGROUPS_MAX];
  28     struct group *g;
  29     int index = 0;
  30
  31     setgrent();
  32
  33     groups[index++] = basegid;
  34
  35     while (index < NGROUPS_MAX && ((g = getgrent()) != NULL)) {
  36         if (g->gr_gid != basegid) {
  37             char **names;
  38
  39             for (names = g->gr_mem; *names != NULL; ++names) {
  40
  41                 if (!strcmp(*names, name))
  42                     groups[index++] = g->gr_gid;
  43
  44             }
  45         }
  46     }
  47
  48     endgrent();
  49
  50     return setgroups(index, groups);
  51
  52 #else
  53
  54     return 0;
  55
  56 #endif /* def HAVE_SETGROUPS */
  57 }
  58