/* vi: set sw=4 ts=4: */ /* * deluser/delgroup implementation for busybox * * 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 GPL version 2, see file LICENSE in this tarball for details. * */ #include "libbb.h" /* Status */ #define STATUS_OK 0 #define NAME_NOT_FOUND 1 #define MEMBER_NOT_FOUND 2 static void del_line_matching(char **args, const char *filename, FILE* FAST_FUNC (*fopen_func)(const char *fileName, const char *mode)) { FILE *passwd; smallint error = NAME_NOT_FOUND; char *name = (ENABLE_FEATURE_DEL_USER_FROM_GROUP && args[2]) ? args[2] : args[1]; char *line, *del; char *new = xzalloc(1); passwd = fopen_func(filename, "r"); if (passwd) { while ((line = xmalloc_fgets(passwd))) { int len = strlen(name); if (strncmp(line, name, len) == 0 && line[len] == ':' ) { error = STATUS_OK; if (ENABLE_FEATURE_DEL_USER_FROM_GROUP) { struct group *gr; char *p; if (args[2] /* There were two args on commandline */ && (gr = getgrnam(name)) /* The group was not deleted in the meanwhile */ && (p = strrchr(line, ':')) /* We can find a pointer to the last ':' */ ) { error = MEMBER_NOT_FOUND; /* Move past ':' (worst case to '\0') and cut the line */ p[1] = '\0'; /* Reuse p */ for (p = xzalloc(1); *gr->gr_mem != NULL; gr->gr_mem++) { /* Add all the other group members */ if (strcmp(args[1], *gr->gr_mem) != 0) { del = p; p = xasprintf("%s%s%s", p, p[0] ? "," : "", *gr->gr_mem); free(del); } else error = STATUS_OK; } /* Recompose the line */ line = xasprintf("%s%s\n", line, p); if (ENABLE_FEATURE_CLEAN_UP) free(p); } else goto skip; } } del = new; new = xasprintf("%s%s", new, line); free(del); skip: free(line); } if (ENABLE_FEATURE_CLEAN_UP) fclose(passwd); if (error) { if (ENABLE_FEATURE_DEL_USER_FROM_GROUP && error == MEMBER_NOT_FOUND) { /* Set the correct values for error message */ filename = name; name = args[1]; } bb_error_msg("can't find %s in %s", name, filename); } else { passwd = fopen_func(filename, "w"); if (passwd) { fputs(new, passwd); if (ENABLE_FEATURE_CLEAN_UP) fclose(passwd); } } } free(new); } int deluser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int deluser_main(int argc, char **argv) { if (argc == 2 || (ENABLE_FEATURE_DEL_USER_FROM_GROUP && (applet_name[3] == 'g' && argc == 3)) ) { if (geteuid()) bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); if ((ENABLE_FEATURE_DEL_USER_FROM_GROUP && argc != 3) || ENABLE_DELUSER || (ENABLE_DELGROUP && ENABLE_DESKTOP) ) { if (ENABLE_DELUSER && (!ENABLE_DELGROUP || applet_name[3] == 'u') ) { del_line_matching(argv, bb_path_passwd_file, xfopen); if (ENABLE_FEATURE_SHADOWPASSWDS) del_line_matching(argv, bb_path_shadow_file, fopen_or_warn); } else if (ENABLE_DESKTOP && ENABLE_DELGROUP && getpwnam(argv[1])) bb_error_msg_and_die("can't remove primary group of user %s", argv[1]); } del_line_matching(argv, bb_path_group_file, xfopen); if (ENABLE_FEATURE_SHADOWPASSWDS) del_line_matching(argv, bb_path_gshadow_file, fopen_or_warn); return EXIT_SUCCESS; } else bb_show_usage(); }