/* vi: set sw=4 ts=4: */ /* * addgroup - add users to /etc/passwd and /etc/shadow * * Copyright (C) 1999 by Lineo, inc. and John Beppu * Copyright (C) 1999,2000,2001 by John Beppu * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * */ #include "busybox.h" /* make sure gr_name isn't taken, make sure gid is kosher * return 1 on failure */ static int group_study(struct group *g) { enum { max = 65000 }; FILE *etc_group; gid_t desired; /* Using _r function to avoid static buffers pulled in */ char buffer[256]; struct group grp; struct group *result; etc_group = xfopen(bb_path_group_file, "r"); /* make sure gr_name isn't taken, make sure gid is kosher */ desired = g->gr_gid; while (!fgetgrent_r(etc_group, &grp, buffer, sizeof(buffer), &result)) { if ((strcmp(grp.gr_name, g->gr_name)) == 0) { bb_error_msg_and_die("%s: group already in use", g->gr_name); } if ((desired) && grp.gr_gid == desired) { bb_error_msg_and_die("%d: gid already in use", desired); } if ((grp.gr_gid > g->gr_gid) && (grp.gr_gid < max)) { g->gr_gid = grp.gr_gid; } } if (ENABLE_FEATURE_CLEAN_UP) fclose(etc_group); /* gid */ g->gr_gid++; if (desired) { g->gr_gid = desired; } /* return 1; */ return 0; } /* append a new user to the passwd file */ static int addgroup(char *group, gid_t gid, const char *user) { FILE *file; struct group gr; /* make sure gid and group haven't already been allocated */ gr.gr_gid = gid; gr.gr_name = group; if (group_study(&gr)) return 1; /* add entry to group */ file = xfopen(bb_path_group_file, "a"); /* group:passwd:gid:userlist */ fprintf(file, "%s:%s:%d:%s\n", group, "x", gr.gr_gid, user); 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 /* return 1; */ return 0; } /* * addgroup will take a login_name as its first parameter. * * gid can be customized via command-line parameters. */ int addgroup_main(int argc, char **argv); int addgroup_main(int argc, char **argv) { char *group; gid_t gid = 0; /* check for min, max and missing args and exit on error */ opt_complementary = "-1:?2:?"; if (getopt32(argc, argv, "g:", &group)) { gid = xatoul_range(group, 0, (gid_t)ULONG_MAX); } /* move past the commandline options */ argv += optind; /* need to be root */ if (geteuid()) { bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); } return addgroup(argv[0], gid, argv[1] ? argv[1] : ""); }