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Diffstat (limited to 'src/group-list.c')
-rw-r--r-- | src/group-list.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/src/group-list.c b/src/group-list.c new file mode 100644 index 000000000..e788f8e87 --- /dev/null +++ b/src/group-list.c @@ -0,0 +1,134 @@ +/* group-list.c --Print a list of group IDs or names. + Copyright (C) 1989-2008 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +/* Written by Arnold Robbins. + Major rewrite by David MacKenzie, djm@gnu.ai.mit.edu. + Extracted from id.c by James Youngman. */ + +#include <config.h> +#include <stdio.h> +#include <sys/types.h> +#include <getopt.h> +#include <pwd.h> +#include <grp.h> + +#include "system.h" +#include "error.h" +#include "mgetgroups.h" +#include "quote.h" +#include "group-list.h" + + +/* Print all of the distinct groups the user is in. */ +extern bool +print_group_list (const char *username, + uid_t ruid, gid_t rgid, gid_t egid, + bool use_names) +{ + bool ok = true; + struct passwd *pwd; + + pwd = getpwuid (ruid); + if (pwd == NULL) + ok = false; + + if (!print_group (rgid, use_names)) + ok = false; + + if (egid != rgid) + { + putchar (' '); + if (!print_group (egid, use_names)) + ok = false; + } + +#if HAVE_GETGROUPS + { + GETGROUPS_T *groups; + size_t i; + + int n_groups = mgetgroups (username, (pwd ? pwd->pw_gid : (gid_t) -1), + &groups); + if (n_groups < 0) + { + if (username) + { + error (0, errno, _("failed to get groups for user %s"), + quote (username)); + } + else + { + error (0, errno, _("failed to get groups for the current process")); + } + return false; + } + + for (i = 0; i < n_groups; i++) + if (groups[i] != rgid && groups[i] != egid) + { + putchar (' '); + if (!print_group (groups[i], use_names)) + ok = false; + } + free (groups); + return ok; + } +#endif /* HAVE_GETGROUPS */ +} + + +/* Print the name or value of group ID GID. */ +extern bool +print_group (gid_t gid, bool use_name) +{ + struct group *grp = NULL; + bool ok = true; + + if (use_name) + { + grp = getgrgid (gid); + if (grp == NULL) + { + error (0, 0, _("cannot find name for group ID %lu"), + (unsigned long int) gid); + ok = false; + } + } + + if (grp == NULL) + { + if (printf ("%lu", (unsigned long int) gid) < 0) + { + error (0, errno, _("write error")); + ok = false; + } + } + else + { + if (printf ("%s", grp->gr_name) < 0) + { + error (0, errno, _("write error")); + ok = false; + } + } + return ok; +} + +/* + * Local variables: + * indent-tabs-mode: nil + * End: + */ |