/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2012 Lennart Poettering Copyright 2013 Zbigniew Jędrzejewski-Szmek systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <errno.h> #include <string.h> #include <unistd.h> #include <getopt.h> #include <sys/prctl.h> #include "hashmap.h" #include "util.h" #include "path-util.h" #include "log.h" #include "pager.h" #include "build.h" #include "strv.h" #include "process-util.h" #include "terminal-util.h" #include "signal-util.h" static const char prefixes[] = "/etc\0" "/run\0" "/usr/local/lib\0" "/usr/local/share\0" "/usr/lib\0" "/usr/share\0" #ifdef HAVE_SPLIT_USR "/lib\0" #endif ; static const char suffixes[] = "sysctl.d\0" "tmpfiles.d\0" "modules-load.d\0" "binfmt.d\0" "systemd/system\0" "systemd/user\0" "systemd/system-preset\0" "systemd/user-preset\0" "udev/rules.d\0" "modprobe.d\0"; static const char have_dropins[] = "systemd/system\0" "systemd/user\0"; static bool arg_no_pager = false; static int arg_diff = -1; static enum { SHOW_MASKED = 1 << 0, SHOW_EQUIVALENT = 1 << 1, SHOW_REDIRECTED = 1 << 2, SHOW_OVERRIDDEN = 1 << 3, SHOW_UNCHANGED = 1 << 4, SHOW_EXTENDED = 1 << 5, SHOW_DEFAULTS = (SHOW_MASKED | SHOW_EQUIVALENT | SHOW_REDIRECTED | SHOW_OVERRIDDEN | SHOW_EXTENDED) } arg_flags = 0; static void pager_open_if_enabled(void) { if (arg_no_pager) return; pager_open(false); } static int equivalent(const char *a, const char *b) { _cleanup_free_ char *x = NULL, *y = NULL; x = canonicalize_file_name(a); if (!x) return -errno; y = canonicalize_file_name(b); if (!y) return -errno; return path_equal(x, y); } static int notify_override_masked(const char *top, const char *bottom) { if (!(arg_flags & SHOW_MASKED)) return 0; printf("%s%s%s %s %s %s\n", ansi_highlight_red(), "[MASKED]", ansi_highlight_off(), top, draw_special_char(DRAW_ARROW), bottom); return 1; } static int notify_override_equivalent(const char *top, const char *bottom) { if (!(arg_flags & SHOW_EQUIVALENT)) return 0; printf("%s%s%s %s %s %s\n", ansi_highlight_green(), "[EQUIVALENT]", ansi_highlight_off(), top, draw_special_char(DRAW_ARROW), bottom); return 1; } static int notify_override_redirected(const char *top, const char *bottom) { if (!(arg_flags & SHOW_REDIRECTED)) return 0; printf("%s%s%s %s %s %s\n", ansi_highlight(), "[REDIRECTED]", ansi_highlight_off(), top, draw_special_char(DRAW_ARROW), bottom); return 1; } static int notify_override_overridden(const char *top, const char *bottom) { if (!(arg_flags & SHOW_OVERRIDDEN)) return 0; printf("%s%s%s %s %s %s\n", ansi_highlight(), "[OVERRIDDEN]", ansi_highlight_off(), top, draw_special_char(DRAW_ARROW), bottom); return 1; } static int notify_override_extended(const char *top, const char *bottom) { if (!(arg_flags & SHOW_EXTENDED)) return 0; printf("%s%s%s %s %s %s\n", ansi_highlight(), "[EXTENDED]", ansi_highlight_off(), top, draw_special_char(DRAW_ARROW), bottom); return 1; } static int notify_override_unchanged(const char *f) { if (!(arg_flags & SHOW_UNCHANGED)) return 0; printf("[UNCHANGED] %s\n", f); return 1; } static int found_override(const char *top, const char *bottom) { _cleanup_free_ char *dest = NULL; int k; pid_t pid; assert(top); assert(bottom); if (null_or_empty_path(top) > 0) return notify_override_masked(top, bottom); k = readlink_malloc(top, &dest); if (k >= 0) { if (equivalent(dest, bottom) > 0) return notify_override_equivalent(top, bottom); else return notify_override_redirected(top, bottom); } k = notify_override_overridden(top, bottom); if (!arg_diff) return k; putchar('\n'); fflush(stdout); pid = fork(); if (pid < 0) return log_error_errno(errno, "Failed to fork off diff: %m"); else if (pid == 0) { (void) reset_all_signal_handlers(); (void) reset_signal_mask(); assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0); execlp("diff", "diff", "-us", "--", bottom, top, NULL); log_error_errno(errno, "Failed to execute diff: %m"); _exit(EXIT_FAILURE); } wait_for_terminate_and_warn("diff", pid, false); putchar('\n'); return k; } static int enumerate_dir_d(Hashmap *top, Hashmap *bottom, Hashmap *drops, const char *toppath, const char *drop) { _cleanup_free_ char *unit = NULL; _cleanup_free_ char *path = NULL; _cleanup_strv_free_ char **list = NULL; char **file; char *c; int r; assert(!endswith(drop, "/")); path = strjoin(toppath, "/", drop, NULL); if (!path) return -ENOMEM; log_debug("Looking at %s", path); unit = strdup(drop); if (!unit) return -ENOMEM; c = strrchr(unit, '.'); if (!c) return -EINVAL; *c = 0; r = get_files_in_directory(path, &list); if (r < 0) return log_error_errno(r, "Failed to enumerate %s: %m", path); STRV_FOREACH(file, list) { Hashmap *h; int k; char *p; char *d; if (!endswith(*file, ".conf")) continue; p = strjoin(path, "/", *file, NULL); if (!p) return -ENOMEM; d = p + strlen(toppath) + 1; log_debug("Adding at top: %s %s %s", d, draw_special_char(DRAW_ARROW), p); k = hashmap_put(top, d, p); if (k >= 0) { p = strdup(p); if (!p) return -ENOMEM; d = p + strlen(toppath) + 1; } else if (k != -EEXIST) { free(p); return k; } log_debug("Adding at bottom: %s %s %s", d, draw_special_char(DRAW_ARROW), p); free(hashmap_remove(bottom, d)); k = hashmap_put(bottom, d, p); if (k < 0) { free(p); return k; } h = hashmap_get(drops, unit); if (!h) { h = hashmap_new(&string_hash_ops); if (!h) return -ENOMEM; hashmap_put(drops, unit, h); unit = strdup(unit); if (!unit) return -ENOMEM; } p = strdup(p); if (!p) return -ENOMEM; log_debug("Adding to drops: %s %s %s %s %s", unit, draw_special_char(DRAW_ARROW), basename(p), draw_special_char(DRAW_ARROW), p); k = hashmap_put(h, basename(p), p); if (k < 0) { free(p); if (k != -EEXIST) return k; } } return 0; } static int enumerate_dir(Hashmap *top, Hashmap *bottom, Hashmap *drops, const char *path, bool dropins) { _cleanup_closedir_ DIR *d; assert(top); assert(bottom); assert(drops); assert(path); log_debug("Looking at %s", path); d = opendir(path); if (!d) { if (errno == ENOENT) return 0; log_error_errno(errno, "Failed to open %s: %m", path); return -errno; } for (;;) { struct dirent *de; int k; char *p; errno = 0; de = readdir(d); if (!de) return -errno; dirent_ensure_type(d, de); if (dropins && de->d_type == DT_DIR && endswith(de->d_name, ".d")) enumerate_dir_d(top, bottom, drops, path, de->d_name); if (!dirent_is_file(de)) continue; p = strjoin(path, "/", de->d_name, NULL); if (!p) return -ENOMEM; log_debug("Adding at top: %s %s %s", basename(p), draw_special_char(DRAW_ARROW), p); k = hashmap_put(top, basename(p), p); if (k >= 0) { p = strdup(p); if (!p) return -ENOMEM; } else if (k != -EEXIST) { free(p); return k; } log_debug("Adding at bottom: %s %s %s", basename(p), draw_special_char(DRAW_ARROW), p); free(hashmap_remove(bottom, basename(p))); k = hashmap_put(bottom, basename(p), p); if (k < 0) { free(p); return k; } } } static int process_suffix(const char *suffix, const char *onlyprefix) { const char *p; char *f; Hashmap *top, *bottom, *drops; Hashmap *h; char *key; int r = 0, k; Iterator i, j; int n_found = 0; bool dropins; assert(suffix); assert(!startswith(suffix, "/")); assert(!strstr(suffix, "//")); dropins = nulstr_contains(have_dropins, suffix); top = hashmap_new(&string_hash_ops); bottom = hashmap_new(&string_hash_ops); drops = hashmap_new(&string_hash_ops); if (!top || !bottom || !drops) { r = -ENOMEM; goto finish; } NULSTR_FOREACH(p, prefixes) { _cleanup_free_ char *t = NULL; t = strjoin(p, "/", suffix, NULL); if (!t) { r = -ENOMEM; goto finish; } k = enumerate_dir(top, bottom, drops, t, dropins); if (r == 0) r = k; } HASHMAP_FOREACH_KEY(f, key, top, i) { char *o; o = hashmap_get(bottom, key); assert(o); if (!onlyprefix || startswith(o, onlyprefix)) { if (path_equal(o, f)) { notify_override_unchanged(f); } else { k = found_override(f, o); if (k < 0) r = k; else n_found += k; } } h = hashmap_get(drops, key); if (h) HASHMAP_FOREACH(o, h, j) if (!onlyprefix || startswith(o, onlyprefix)) n_found += notify_override_extended(f, o); } finish: if (top) hashmap_free_free(top); if (bottom) hashmap_free_free(bottom); if (drops) { HASHMAP_FOREACH_KEY(h, key, drops, i){ hashmap_free_free(hashmap_remove(drops, key)); hashmap_remove(drops, key); free(key); } hashmap_free(drops); } return r < 0 ? r : n_found; } static int process_suffixes(const char *onlyprefix) { const char *n; int n_found = 0, r; NULSTR_FOREACH(n, suffixes) { r = process_suffix(n, onlyprefix); if (r < 0) return r; else n_found += r; } return n_found; } static int process_suffix_chop(const char *arg) { const char *p; assert(arg); if (!path_is_absolute(arg)) return process_suffix(arg, NULL); /* Strip prefix from the suffix */ NULSTR_FOREACH(p, prefixes) { const char *suffix = startswith(arg, p); if (suffix) { suffix += strspn(suffix, "/"); if (*suffix) return process_suffix(suffix, NULL); else return process_suffixes(arg); } } log_error("Invalid suffix specification %s.", arg); return -EINVAL; } static void help(void) { printf("%s [OPTIONS...] [SUFFIX...]\n\n" "Find overridden configuration files.\n\n" " -h --help Show this help\n" " --version Show package version\n" " --no-pager Do not pipe output into a pager\n" " --diff[=1|0] Show a diff when overridden files differ\n" " -t --type=LIST... Only display a selected set of override types\n" , program_invocation_short_name); } static int parse_flags(const char *flag_str, int flags) { const char *word, *state; size_t l; FOREACH_WORD_SEPARATOR(word, l, flag_str, ",", state) { if (strneq("masked", word, l)) flags |= SHOW_MASKED; else if (strneq ("equivalent", word, l)) flags |= SHOW_EQUIVALENT; else if (strneq("redirected", word, l)) flags |= SHOW_REDIRECTED; else if (strneq("overridden", word, l)) flags |= SHOW_OVERRIDDEN; else if (strneq("unchanged", word, l)) flags |= SHOW_UNCHANGED; else if (strneq("extended", word, l)) flags |= SHOW_EXTENDED; else if (strneq("default", word, l)) flags |= SHOW_DEFAULTS; else return -EINVAL; } return flags; } static int parse_argv(int argc, char *argv[]) { enum { ARG_NO_PAGER = 0x100, ARG_DIFF, ARG_VERSION }; static const struct option options[] = { { "help", no_argument, NULL, 'h' }, { "version", no_argument, NULL, ARG_VERSION }, { "no-pager", no_argument, NULL, ARG_NO_PAGER }, { "diff", optional_argument, NULL, ARG_DIFF }, { "type", required_argument, NULL, 't' }, {} }; int c; assert(argc >= 1); assert(argv); while ((c = getopt_long(argc, argv, "ht:", options, NULL)) >= 0) switch (c) { case 'h': help(); return 0; case ARG_VERSION: puts(PACKAGE_STRING); puts(SYSTEMD_FEATURES); return 0; case ARG_NO_PAGER: arg_no_pager = true; break; case 't': { int f; f = parse_flags(optarg, arg_flags); if (f < 0) { log_error("Failed to parse flags field."); return -EINVAL; } arg_flags = f; break; } case ARG_DIFF: if (!optarg) arg_diff = 1; else { int b; b = parse_boolean(optarg); if (b < 0) { log_error("Failed to parse diff boolean."); return -EINVAL; } else if (b) arg_diff = 1; else arg_diff = 0; } break; case '?': return -EINVAL; default: assert_not_reached("Unhandled option"); } return 1; } int main(int argc, char *argv[]) { int r = 0, k; int n_found = 0; log_parse_environment(); log_open(); r = parse_argv(argc, argv); if (r <= 0) goto finish; if (arg_flags == 0) arg_flags = SHOW_DEFAULTS; if (arg_diff < 0) arg_diff = !!(arg_flags & SHOW_OVERRIDDEN); else if (arg_diff) arg_flags |= SHOW_OVERRIDDEN; pager_open_if_enabled(); if (optind < argc) { int i; for (i = optind; i < argc; i++) { path_kill_slashes(argv[i]); k = process_suffix_chop(argv[i]); if (k < 0) r = k; else n_found += k; } } else { k = process_suffixes(NULL); if (k < 0) r = k; else n_found += k; } if (r >= 0) printf("%s%i overridden configuration files found.\n", n_found ? "\n" : "", n_found); finish: pager_close(); return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; }