/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include #include "alloc-util.h" #include "dirent-util.h" #include "fd-util.h" #include "fs-util.h" #include "hashmap.h" #include "locale-util.h" #include "log.h" #include "main-func.h" #include "nulstr-util.h" #include "pager.h" #include "parse-util.h" #include "path-util.h" #include "pretty-print.h" #include "process-util.h" #include "signal-util.h" #include "stat-util.h" #include "string-util.h" #include "strv.h" #include "terminal-util.h" static const char prefixes[] = "/etc\0" "/run\0" "/usr/local/lib\0" "/usr/local/share\0" "/usr/lib\0" "/usr/share\0" #if 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 PagerFlags arg_pager_flags = 0; 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 int equivalent(const char *a, const char *b) { _cleanup_free_ char *x = NULL, *y = NULL; int r; r = chase_symlinks(a, NULL, CHASE_TRAIL_SLASH, &x, NULL); if (r < 0) return r; r = chase_symlinks(b, NULL, CHASE_TRAIL_SLASH, &y, NULL); if (r < 0) return r; 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_normal(), top, special_glyph(SPECIAL_GLYPH_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_normal(), top, special_glyph(SPECIAL_GLYPH_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_normal(), top, special_glyph(SPECIAL_GLYPH_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_normal(), top, special_glyph(SPECIAL_GLYPH_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_normal(), top, special_glyph(SPECIAL_GLYPH_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; pid_t pid; int r; assert(top); assert(bottom); if (null_or_empty_path(top) > 0) return notify_override_masked(top, bottom); r = readlink_malloc(top, &dest); if (r >= 0) { if (equivalent(dest, bottom) > 0) return notify_override_equivalent(top, bottom); else return notify_override_redirected(top, bottom); } r = notify_override_overridden(top, bottom); if (!arg_diff) return r; putchar('\n'); fflush(stdout); r = safe_fork("(diff)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid); if (r < 0) return r; if (r == 0) { execlp("diff", "diff", "-us", "--", bottom, top, NULL); log_open(); log_error_errno(errno, "Failed to execute diff: %m"); _exit(EXIT_FAILURE); } (void) wait_for_terminate_and_check("diff", pid, WAIT_LOG_ABNORMAL); putchar('\n'); return r; } static int enumerate_dir_d( OrderedHashmap *top, OrderedHashmap *bottom, OrderedHashmap *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 = path_join(toppath, drop); 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_sort(list); STRV_FOREACH(file, list) { OrderedHashmap *h; int k; char *p; char *d; if (!endswith(*file, ".conf")) continue; p = path_join(path, *file); if (!p) return -ENOMEM; d = p + strlen(toppath) + 1; log_debug("Adding at top: %s %s %s", d, special_glyph(SPECIAL_GLYPH_ARROW), p); k = ordered_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, special_glyph(SPECIAL_GLYPH_ARROW), p); free(ordered_hashmap_remove(bottom, d)); k = ordered_hashmap_put(bottom, d, p); if (k < 0) { free(p); return k; } h = ordered_hashmap_get(drops, unit); if (!h) { h = ordered_hashmap_new(&string_hash_ops); if (!h) return -ENOMEM; ordered_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, special_glyph(SPECIAL_GLYPH_ARROW), basename(p), special_glyph(SPECIAL_GLYPH_ARROW), p); k = ordered_hashmap_put(h, basename(p), p); if (k < 0) { free(p); if (k != -EEXIST) return k; } } return 0; } static int enumerate_dir( OrderedHashmap *top, OrderedHashmap *bottom, OrderedHashmap *drops, const char *path, bool dropins) { _cleanup_closedir_ DIR *d = NULL; struct dirent *de; _cleanup_strv_free_ char **files = NULL, **dirs = NULL; size_t n_files = 0, allocated_files = 0, n_dirs = 0, allocated_dirs = 0; char **t; int r; assert(top); assert(bottom); assert(drops); assert(path); log_debug("Looking at %s", path); d = opendir(path); if (!d) { if (errno == ENOENT) return 0; return log_error_errno(errno, "Failed to open %s: %m", path); } FOREACH_DIRENT_ALL(de, d, return -errno) { dirent_ensure_type(d, de); if (dropins && de->d_type == DT_DIR && endswith(de->d_name, ".d")) { if (!GREEDY_REALLOC0(dirs, allocated_dirs, n_dirs + 2)) return -ENOMEM; dirs[n_dirs] = strdup(de->d_name); if (!dirs[n_dirs]) return -ENOMEM; n_dirs ++; } if (!dirent_is_file(de)) continue; if (!GREEDY_REALLOC0(files, allocated_files, n_files + 2)) return -ENOMEM; files[n_files] = strdup(de->d_name); if (!files[n_files]) return -ENOMEM; n_files ++; } strv_sort(dirs); strv_sort(files); STRV_FOREACH(t, dirs) { r = enumerate_dir_d(top, bottom, drops, path, *t); if (r < 0) return r; } STRV_FOREACH(t, files) { _cleanup_free_ char *p = NULL; p = path_join(path, *t); if (!p) return -ENOMEM; log_debug("Adding at top: %s %s %s", basename(p), special_glyph(SPECIAL_GLYPH_ARROW), p); r = ordered_hashmap_put(top, basename(p), p); if (r >= 0) { p = strdup(p); if (!p) return -ENOMEM; } else if (r != -EEXIST) return r; log_debug("Adding at bottom: %s %s %s", basename(p), special_glyph(SPECIAL_GLYPH_ARROW), p); free(ordered_hashmap_remove(bottom, basename(p))); r = ordered_hashmap_put(bottom, basename(p), p); if (r < 0) return r; p = NULL; } return 0; } static int should_skip_path(const char *prefix, const char *suffix) { #if HAVE_SPLIT_USR _cleanup_free_ char *target = NULL; const char *dirname, *p; dirname = prefix_roota(prefix, suffix); if (chase_symlinks(dirname, NULL, 0, &target, NULL) < 0) return false; NULSTR_FOREACH(p, prefixes) { _cleanup_free_ char *tmp = NULL; if (path_startswith(dirname, p)) continue; tmp = path_join(p, suffix); if (!tmp) return -ENOMEM; if (path_equal(target, tmp)) { log_debug("%s redirects to %s, skipping.", dirname, target); return true; } } #endif return false; } static int process_suffix(const char *suffix, const char *onlyprefix) { const char *p; char *f, *key; OrderedHashmap *top, *bottom, *drops, *h; int r = 0, k, n_found = 0; bool dropins; assert(suffix); assert(!startswith(suffix, "/")); assert(!strstr(suffix, "//")); dropins = nulstr_contains(have_dropins, suffix); top = ordered_hashmap_new(&string_hash_ops); bottom = ordered_hashmap_new(&string_hash_ops); drops = ordered_hashmap_new(&string_hash_ops); if (!top || !bottom || !drops) { r = -ENOMEM; goto finish; } NULSTR_FOREACH(p, prefixes) { _cleanup_free_ char *t = NULL; if (should_skip_path(p, suffix) > 0) continue; t = path_join(p, suffix); if (!t) { r = -ENOMEM; goto finish; } k = enumerate_dir(top, bottom, drops, t, dropins); if (r == 0) r = k; } ORDERED_HASHMAP_FOREACH_KEY(f, key, top) { char *o; o = ordered_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 = ordered_hashmap_get(drops, key); if (h) ORDERED_HASHMAP_FOREACH(o, h) if (!onlyprefix || startswith(o, onlyprefix)) n_found += notify_override_extended(f, o); } finish: ordered_hashmap_free_free(top); ordered_hashmap_free_free(bottom); ORDERED_HASHMAP_FOREACH_KEY(h, key, drops) { ordered_hashmap_free_free(ordered_hashmap_remove(drops, key)); ordered_hashmap_remove(drops, key); free(key); } ordered_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; 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; suffix = startswith(arg, p); if (suffix) { suffix += strspn(suffix, "/"); if (*suffix) return process_suffix(suffix, p); else return process_suffixes(arg); } } return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid suffix specification %s.", arg); } static int help(void) { _cleanup_free_ char *link = NULL; int r; r = terminal_urlify_man("systemd-delta", "1", &link); if (r < 0) return log_oom(); 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" "\nSee the %s for details.\n", program_invocation_short_name, link); return 0; } static int parse_flags(const char *flag_str, int flags) { for (;;) { _cleanup_free_ char *word = NULL; int r; r = extract_first_word(&flag_str, &word, ",", EXTRACT_DONT_COALESCE_SEPARATORS); if (r < 0) return r; if (r == 0) return flags; if (streq(word, "masked")) flags |= SHOW_MASKED; else if (streq(word, "equivalent")) flags |= SHOW_EQUIVALENT; else if (streq(word, "redirected")) flags |= SHOW_REDIRECTED; else if (streq(word, "overridden")) flags |= SHOW_OVERRIDDEN; else if (streq(word, "unchanged")) flags |= SHOW_UNCHANGED; else if (streq(word, "extended")) flags |= SHOW_EXTENDED; else if (streq(word, "default")) flags |= SHOW_DEFAULTS; else return -EINVAL; } } 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': return help(); case ARG_VERSION: return version(); case ARG_NO_PAGER: arg_pager_flags |= PAGER_DISABLE; break; case 't': { int f; f = parse_flags(optarg, arg_flags); if (f < 0) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to parse flags field."); arg_flags = f; break; } case ARG_DIFF: if (!optarg) arg_diff = 1; else { int b; b = parse_boolean(optarg); if (b < 0) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to parse diff boolean."); arg_diff = b; } break; case '?': return -EINVAL; default: assert_not_reached("Unhandled option"); } return 1; } static int run(int argc, char *argv[]) { int r, k, n_found = 0; log_setup(); r = parse_argv(argc, argv); if (r <= 0) return r; 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; (void) pager_open(arg_pager_flags); if (optind < argc) { int i; for (i = optind; i < argc; i++) { path_simplify(argv[i], false); 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); return r; } DEFINE_MAIN_FUNCTION(run);