| /* vi: set sw=4 ts=4: */ |
| /* |
| * addgroup - add groups to /etc/group and /etc/gshadow |
| * |
| * Copyright (C) 1999 by Lineo, inc. and John Beppu |
| * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org> |
| * Copyright (C) 2007 by Tito Ragusa <farmatito@tiscali.it> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| * |
| */ |
| |
| #include "libbb.h" |
| |
| static void xgroup_study(struct group *g) |
| { |
| /* Make sure gr_name is unused */ |
| if (getgrnam(g->gr_name)) { |
| goto error; |
| } |
| |
| /* Check if the desired gid is free |
| * or find the first free one */ |
| while (1) { |
| if (!getgrgid(g->gr_gid)) { |
| return; /* found free group: return */ |
| } |
| if (option_mask32) { |
| /* -g N, cannot pick gid other than N: error */ |
| g->gr_name = itoa(g->gr_gid); |
| goto error; |
| } |
| g->gr_gid++; |
| if (g->gr_gid <= 0) { |
| /* overflowed: error */ |
| bb_error_msg_and_die("no gids left"); |
| } |
| } |
| |
| error: |
| /* exit */ |
| bb_error_msg_and_die("group %s already exists", g->gr_name); |
| } |
| |
| /* append a new user to the passwd file */ |
| static void new_group(char *group, gid_t gid) |
| { |
| FILE *file; |
| struct group gr; |
| |
| /* make sure gid and group haven't already been allocated */ |
| gr.gr_gid = gid; |
| gr.gr_name = group; |
| xgroup_study(&gr); |
| |
| /* add entry to group */ |
| file = xfopen(bb_path_group_file, "a"); |
| /* group:passwd:gid:userlist */ |
| fprintf(file, "%s:x:%d:\n", group, gr.gr_gid); |
| if (ENABLE_FEATURE_CLEAN_UP) |
| fclose(file); |
| #if ENABLE_FEATURE_SHADOWPASSWDS |
| file = fopen_or_warn(bb_path_gshadow_file, "a"); |
| if (file) { |
| fprintf(file, "%s:!::\n", group); |
| if (ENABLE_FEATURE_CLEAN_UP) |
| fclose(file); |
| } |
| #endif |
| } |
| |
| #if ENABLE_FEATURE_ADDUSER_TO_GROUP |
| static void add_user_to_group(char **args, |
| const char *path, |
| FILE *(*fopen_func)(const char *fileName, const char *mode)) |
| { |
| char *line; |
| int len = strlen(args[1]); |
| llist_t *plist = NULL; |
| FILE *group_file; |
| |
| group_file = fopen_func(path, "r"); |
| |
| if (!group_file) return; |
| |
| while ((line = xmalloc_getline(group_file))) { |
| /* Find the group */ |
| if (!strncmp(line, args[1], len) |
| && line[len] == ':' |
| ) { |
| /* Add the new user */ |
| line = xasprintf("%s%s%s", line, |
| last_char_is(line, ':') ? "" : ",", |
| args[0]); |
| } |
| llist_add_to_end(&plist, line); |
| } |
| |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| fclose(group_file); |
| group_file = fopen_func(path, "w"); |
| while ((line = llist_pop(&plist))) { |
| if (group_file) |
| fprintf(group_file, "%s\n", line); |
| free(line); |
| } |
| if (group_file) |
| fclose(group_file); |
| } else { |
| group_file = fopen_func(path, "w"); |
| if (group_file) |
| while ((line = llist_pop(&plist))) |
| fprintf(group_file, "%s\n", line); |
| } |
| } |
| #endif |
| |
| /* |
| * addgroup will take a login_name as its first parameter. |
| * |
| * gid can be customized via command-line parameters. |
| * If called with two non-option arguments, addgroup |
| * will add an existing user to an existing group. |
| */ |
| int addgroup_main(int argc, char **argv); |
| int addgroup_main(int argc, char **argv) |
| { |
| char *group; |
| gid_t gid = 0; |
| |
| /* need to be root */ |
| if (geteuid()) { |
| bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); |
| } |
| |
| /* Syntax: |
| * addgroup group |
| * addgroup -g num group |
| * addgroup user group |
| * Check for min, max and missing args */ |
| opt_complementary = "-1:?2"; |
| if (getopt32(argc, argv, "g:", &group)) { |
| gid = xatoul_range(group, 0, ((unsigned long)(gid_t)ULONG_MAX) >> 1); |
| } |
| /* move past the commandline options */ |
| argv += optind; |
| argc -= optind; |
| |
| #if ENABLE_FEATURE_ADDUSER_TO_GROUP |
| if (argc == 2) { |
| struct group *gr; |
| |
| if (option_mask32) { |
| /* -g was there, but "addgroup -g num user group" |
| * is a no-no */ |
| bb_show_usage(); |
| } |
| |
| /* check if group and user exist */ |
| xuname2uid(argv[0]); /* unknown user: exit */ |
| xgroup2gid(argv[1]); /* unknown group: exit */ |
| /* check if user is already in this group */ |
| gr = getgrnam(argv[1]); |
| for (; *(gr->gr_mem) != NULL; (gr->gr_mem)++) { |
| if (!strcmp(argv[0], *(gr->gr_mem))) { |
| /* user is already in group: do nothing */ |
| return EXIT_SUCCESS; |
| } |
| } |
| add_user_to_group(argv, bb_path_group_file, xfopen); |
| #if ENABLE_FEATURE_SHADOWPASSWDS |
| add_user_to_group(argv, bb_path_gshadow_file, fopen_or_warn); |
| #endif /* ENABLE_FEATURE_SHADOWPASSWDS */ |
| } else |
| #endif /* ENABLE_FEATURE_ADDUSER_TO_GROUP */ |
| new_group(argv[0], gid); |
| |
| /* Reached only on success */ |
| return EXIT_SUCCESS; |
| } |