diff options
Diffstat (limited to 'src/groups.c')
| -rw-r--r-- | src/groups.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/src/groups.c b/src/groups.c new file mode 100644 index 0000000..c866e13 --- /dev/null +++ b/src/groups.c @@ -0,0 +1,145 @@ +/* groups -- print the groups a user is in + Copyright (C) 1989-2020 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 <https://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 <sys/types.h> +#include <pwd.h> +#include <grp.h> +#include <getopt.h> + +#include "system.h" +#include "die.h" +#include "group-list.h" +#include "quote.h" + +/* The official name of this program (e.g., no 'g' prefix). */ +#define PROGRAM_NAME "groups" + +#define AUTHORS \ + proper_name ("David MacKenzie"), \ + proper_name ("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) + emit_try_help (); + else + { + printf (_("Usage: %s [OPTION]... [USERNAME]...\n"), program_name); + fputs (_("\ +Print group memberships for each USERNAME or, if no USERNAME is specified, for\ +\n\ +the current process (which may differ if the groups database has changed).\n"), + stdout); + fputs (HELP_OPTION_DESCRIPTION, stdout); + fputs (VERSION_OPTION_DESCRIPTION, stdout); + emit_ancillary_info (PROGRAM_NAME); + } + exit (status); +} + +int +main (int argc, char **argv) +{ + int optc; + bool ok = true; + gid_t rgid, egid; + uid_t ruid; + + initialize_main (&argc, &argv); + set_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. */ + uid_t NO_UID = -1; + gid_t NO_GID = -1; + + errno = 0; + ruid = getuid (); + if (ruid == NO_UID && errno) + die (EXIT_FAILURE, errno, _("cannot get real UID")); + + errno = 0; + egid = getegid (); + if (egid == NO_GID && errno) + die (EXIT_FAILURE, errno, _("cannot get effective GID")); + + errno = 0; + rgid = getgid (); + if (rgid == NO_GID && errno) + die (EXIT_FAILURE, errno, _("cannot get real GID")); + + if (!print_group_list (NULL, ruid, rgid, egid, true, ' ')) + ok = false; + putchar ('\n'); + } + else + { + /* At least one argument. Divulge the details of the specified users. */ + for ( ; optind < argc; optind++) + { + struct passwd *pwd = getpwnam (argv[optind]); + if (pwd == NULL) + { + error (0, 0, _("%s: no such user"), quote (argv[optind])); + ok = false; + continue; + } + ruid = pwd->pw_uid; + rgid = egid = pwd->pw_gid; + + printf ("%s : ", argv[optind]); + if (!print_group_list (argv[optind], ruid, rgid, egid, true, ' ')) + ok = false; + putchar ('\n'); + } + } + + return ok ? EXIT_SUCCESS : EXIT_FAILURE; +} |