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Diffstat (limited to 'src/groups.c')
-rw-r--r-- | src/groups.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/src/groups.c b/src/groups.c new file mode 100644 index 000000000..8a4673ced --- /dev/null +++ b/src/groups.c @@ -0,0 +1,153 @@ +/* groups -- print the groups a user is in + 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 James Youngman based on id.c and groups.sh, + which were written by Arnold Robbins and David MacKenzie. */ + +#include <config.h> +#include <stdio.h> +#include <getopt.h> +#include <sys/types.h> +#include <pwd.h> +#include <grp.h> +#include <getopt.h> + +#include "system.h" +#include "error.h" +#include "group-list.h" + +/* The name this program was run with. */ +char *program_name; + +/* The official name of this program (e.g., no `g' prefix). */ +#define PROGRAM_NAME "groups" + +#define AUTHORS "David MacKenzie", "James Youngman" + + +static struct option const longopts[] = +{ + {GETOPT_HELP_OPTION_DECL}, + {GETOPT_VERSION_OPTION_DECL}, + {NULL, 0, NULL, 0} +}; + +void +usage (int status) +{ + if (status != EXIT_SUCCESS) + fprintf (stderr, _("Try `%s --help' for more information.\n"), + program_name); + else + { + printf (_("Usage: %s [OPTION]... [USERNAME]\n"), program_name); + fputs (_("\ +Print information for USERNAME or, if no USERNAME is specified,\n\ +the current process (which is different if the groups database has changed).\n"), + stdout); + fputs (HELP_OPTION_DESCRIPTION, stdout); + fputs (VERSION_OPTION_DESCRIPTION, stdout); + emit_bug_reporting_address (); + } + exit (status); +} + +static void +write_error (void) +{ + error (0, errno, _("write error")); +} + + +int +main (int argc, char **argv) +{ + int optc; + bool ok = true; + gid_t rgid, egid; + uid_t ruid; + + initialize_main (&argc, &argv); + program_name = argv[0]; + setlocale (LC_ALL, ""); + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + atexit (close_stdout); + + /* Processing the arguments this way makes groups.c behave differently to + * groups.sh if one of the arguments is "--". + */ + while ((optc = getopt_long (argc, argv, "", longopts, NULL)) != -1) + { + switch (optc) + { + case_GETOPT_HELP_CHAR; + case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS); + default: + usage (EXIT_FAILURE); + } + } + + if (optind == argc) + { + /* No arguments. Divulge the details of the current process. */ + ruid = getuid (); + egid = getegid (); + rgid = getgid (); + + if (!print_group_list (NULL, ruid, rgid, egid, true)) + ok = false; + if (EOF == putchar ('\n')) + { + write_error (); + ok = false; + } + } + else + { + /* At least one argument. Divulge the details of the specified users. */ + while (optind < argc) + { + struct passwd *pwd = getpwnam (argv[optind]); + if (pwd == NULL) + error (EXIT_FAILURE, 0, _("%s: No such user"), argv[optind]); + ruid = pwd->pw_uid; + rgid = egid = pwd->pw_gid; + + if (printf ("%s : ", argv[optind]) < 0) + { + write_error (); + ok = false; + } + if (!print_group_list (argv[optind++], ruid, rgid, egid, true)) + ok = false; + if (EOF == putchar ('\n')) + { + write_error (); + ok = false; + } + } + } + + exit (ok ? EXIT_SUCCESS : EXIT_FAILURE); +} + +/* + * Local variables: + * indent-tabs-mode: nil + * End: + */ |