/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2011 Lennart Poettering 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 <fcntl.h> #include <stddef.h> #include <unistd.h> #include <sys/inotify.h> #include <sys/poll.h> #include "sd-journal.h" #include "journal-def.h" #include "journal-file.h" #include "hashmap.h" #include "list.h" #include "path-util.h" #include "lookup3.h" #include "compress.h" #include "journal-internal.h" #define JOURNAL_FILES_MAX 1024 static void detach_location(sd_journal *j) { Iterator i; JournalFile *f; assert(j); j->current_file = NULL; j->current_field = 0; HASHMAP_FOREACH(f, j->files, i) f->current_offset = 0; } static void reset_location(sd_journal *j) { assert(j); detach_location(j); zero(j->current_location); } static void init_location(Location *l, JournalFile *f, Object *o) { assert(l); assert(f); assert(o->object.type == OBJECT_ENTRY); l->type = LOCATION_DISCRETE; l->seqnum = le64toh(o->entry.seqnum); l->seqnum_id = f->header->seqnum_id; l->realtime = le64toh(o->entry.realtime); l->monotonic = le64toh(o->entry.monotonic); l->boot_id = o->entry.boot_id; l->xor_hash = le64toh(o->entry.xor_hash); l->seqnum_set = l->realtime_set = l->monotonic_set = l->xor_hash_set = true; } static void set_location(sd_journal *j, JournalFile *f, Object *o, uint64_t offset) { assert(j); assert(f); assert(o); init_location(&j->current_location, f, o); j->current_file = f; j->current_field = 0; f->current_offset = offset; } static int same_field(const void *_a, size_t s, const void *_b, size_t t) { const uint8_t *a = _a, *b = _b; size_t j; bool a_good = false, b_good = false, different = false; for (j = 0; j < s && j < t; j++) { if (a[j] == '=') a_good = true; if (b[j] == '=') b_good = true; if (a[j] != b[j]) different = true; if (a_good && b_good) return different ? 0 : 1; } return -EINVAL; } _public_ int sd_journal_add_match(sd_journal *j, const void *data, size_t size) { Match *m, *after = NULL; le64_t le_hash; if (!j) return -EINVAL; if (!data) return -EINVAL; if (size <= 1) return -EINVAL; if (!memchr(data, '=', size)) return -EINVAL; if (*(char*) data == '=') return -EINVAL; /* FIXME: iterating with multiple matches is currently * broken */ if (j->matches) return -ENOTSUP; le_hash = htole64(hash64(data, size)); LIST_FOREACH(matches, m, j->matches) { int r; if (m->le_hash == le_hash && m->size == size && memcmp(m->data, data, size) == 0) return 0; r = same_field(data, size, m->data, m->size); if (r < 0) return r; else if (r > 0) after = m; } m = new0(Match, 1); if (!m) return -ENOMEM; m->size = size; m->data = malloc(m->size); if (!m->data) { free(m); return -ENOMEM; } memcpy(m->data, data, size); m->le_hash = le_hash; /* Matches for the same fields we order adjacent to each * other */ LIST_INSERT_AFTER(Match, matches, j->matches, after, m); j->n_matches ++; detach_location(j); return 0; } _public_ void sd_journal_flush_matches(sd_journal *j) { if (!j) return; while (j->matches) { Match *m = j->matches; LIST_REMOVE(Match, matches, j->matches, m); free(m->data); free(m); } j->n_matches = 0; detach_location(j); } static int compare_order(JournalFile *af, Object *ao, JournalFile *bf, Object *bo) { uint64_t a, b; assert(af); assert(ao); assert(bf); assert(bo); /* We operate on two different files here, hence we can access * two objects at the same time, which we normally can't. * * If contents and timestamps match, these entries are * identical, even if the seqnum does not match */ if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id) && ao->entry.monotonic == bo->entry.monotonic && ao->entry.realtime == bo->entry.realtime && ao->entry.xor_hash == bo->entry.xor_hash) return 0; if (sd_id128_equal(af->header->seqnum_id, bf->header->seqnum_id)) { /* If this is from the same seqnum source, compare * seqnums */ a = le64toh(ao->entry.seqnum); b = le64toh(bo->entry.seqnum); if (a < b) return -1; if (a > b) return 1; /* Wow! This is weird, different data but the same * seqnums? Something is borked, but let's make the * best of it and compare by time. */ } if (sd_id128_equal(ao->entry.boot_id, bo->entry.boot_id)) { /* If the boot id matches compare monotonic time */ a = le64toh(ao->entry.monotonic); b = le64toh(bo->entry.monotonic); if (a < b) return -1; if (a > b) return 1; } /* Otherwise compare UTC time */ a = le64toh(ao->entry.realtime); b = le64toh(bo->entry.realtime); if (a < b) return -1; if (a > b) return 1; /* Finally, compare by contents */ a = le64toh(ao->entry.xor_hash); b = le64toh(bo->entry.xor_hash); if (a < b) return -1; if (a > b) return 1; return 0; } static int compare_with_location(JournalFile *af, Object *ao, Location *l) { uint64_t a; assert(af); assert(ao); assert(l); assert(l->type == LOCATION_DISCRETE); if (l->monotonic_set && sd_id128_equal(ao->entry.boot_id, l->boot_id) && l->realtime_set && le64toh(ao->entry.realtime) == l->realtime && l->xor_hash_set && le64toh(ao->entry.xor_hash) == l->xor_hash) return 0; if (l->seqnum_set && sd_id128_equal(af->header->seqnum_id, l->seqnum_id)) { a = le64toh(ao->entry.seqnum); if (a < l->seqnum) return -1; if (a > l->seqnum) return 1; } if (l->monotonic_set && sd_id128_equal(ao->entry.boot_id, l->boot_id)) { a = le64toh(ao->entry.monotonic); if (a < l->monotonic) return -1; if (a > l->monotonic) return 1; } if (l->realtime_set) { a = le64toh(ao->entry.realtime); if (a < l->realtime) return -1; if (a > l->realtime) return 1; } if (l->xor_hash_set) { a = le64toh(ao->entry.xor_hash); if (a < l->xor_hash) return -1; if (a > l->xor_hash) return 1; } return 0; } static int find_location(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) { Object *o = NULL; uint64_t p = 0; int r; assert(j); if (!j->matches) { /* No matches is simple */ if (j->current_location.type == LOCATION_HEAD) r = journal_file_next_entry(f, NULL, 0, DIRECTION_DOWN, &o, &p); else if (j->current_location.type == LOCATION_TAIL) r = journal_file_next_entry(f, NULL, 0, DIRECTION_UP, &o, &p); else if (j->current_location.seqnum_set && sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id)) r = journal_file_move_to_entry_by_seqnum(f, j->current_location.seqnum, direction, &o, &p); else if (j->current_location.monotonic_set) { r = journal_file_move_to_entry_by_monotonic(f, j->current_location.boot_id, j->current_location.monotonic, direction, &o, &p); if (r == -ENOENT) { /* boot id unknown in this file */ if (j->current_location.realtime_set) r = journal_file_move_to_entry_by_realtime(f, j->current_location.realtime, direction, &o, &p); else r = journal_file_next_entry(f, NULL, 0, direction, &o, &p); } } else if (j->current_location.realtime_set) r = journal_file_move_to_entry_by_realtime(f, j->current_location.realtime, direction, &o, &p); else r = journal_file_next_entry(f, NULL, 0, direction, &o, &p); if (r <= 0) return r; } else { Match *m, *term_match = NULL; Object *to = NULL; uint64_t tp = 0; /* We have matches, first, let's jump to the monotonic * position if we have any, since it implies a * match. */ if (j->current_location.type == LOCATION_DISCRETE && j->current_location.monotonic_set) { r = journal_file_move_to_entry_by_monotonic(f, j->current_location.boot_id, j->current_location.monotonic, direction, &o, &p); if (r <= 0) return r == -ENOENT ? 0 : r; } LIST_FOREACH(matches, m, j->matches) { Object *c, *d; uint64_t cp, dp; r = journal_file_find_data_object_with_hash(f, m->data, m->size, le64toh(m->le_hash), &d, &dp); if (r <= 0) return r; if (j->current_location.type == LOCATION_HEAD) r = journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_DOWN, &c, &cp); else if (j->current_location.type == LOCATION_TAIL) r = journal_file_next_entry_for_data(f, NULL, 0, dp, DIRECTION_UP, &c, &cp); else if (j->current_location.seqnum_set && sd_id128_equal(j->current_location.seqnum_id, f->header->seqnum_id)) r = journal_file_move_to_entry_by_seqnum_for_data(f, dp, j->current_location.seqnum, direction, &c, &cp); else if (j->current_location.realtime_set) r = journal_file_move_to_entry_by_realtime_for_data(f, dp, j->current_location.realtime, direction, &c, &cp); else r = journal_file_next_entry_for_data(f, NULL, 0, dp, direction, &c, &cp); if (r < 0) return r; if (!term_match) { term_match = m; if (r > 0) { to = c; tp = cp; } } else if (same_field(term_match->data, term_match->size, m->data, m->size)) { /* Same field as previous match... */ if (r > 0) { /* Find the earliest of the OR matches */ if (!to || (direction == DIRECTION_DOWN && cp < tp) || (direction == DIRECTION_UP && cp > tp)) { to = c; tp = cp; } } } else { /* Previous term is finished, did anything match? */ if (!to) return 0; /* Find the last of the AND matches */ if (!o || (direction == DIRECTION_DOWN && tp > p) || (direction == DIRECTION_UP && tp < p)) { o = to; p = tp; } term_match = m; if (r > 0) { to = c; tp = cp; } else { to = NULL; tp = 0; } } } /* Last term is finished, did anything match? */ if (!to) return 0; if (!o || (direction == DIRECTION_DOWN && tp > p) || (direction == DIRECTION_UP && tp < p)) { o = to; p = tp; } if (!o) return 0; } if (ret) *ret = o; if (offset) *offset = p; return 1; } static int next_with_matches(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) { int r; uint64_t cp; Object *c; assert(j); assert(f); assert(ret); assert(offset); c = *ret; cp = *offset; if (!j->matches) { /* No matches is easy */ r = journal_file_next_entry(f, c, cp, direction, &c, &cp); if (r <= 0) return r; if (ret) *ret = c; if (offset) *offset = cp; return 1; } /* So there are matches we have to adhere to, let's find the * first entry that matches all of them */ for (;;) { uint64_t np, n; bool found, term_result = false; Match *m, *term_match = NULL; Object *npo = NULL; n = journal_file_entry_n_items(c); /* Make sure we don't match the entry we are starting * from. */ found = cp != *offset; np = 0; LIST_FOREACH(matches, m, j->matches) { uint64_t q, k; Object *qo = NULL; /* Let's check if this is the beginning of a * new term, i.e. has a different field prefix * as the preceeding match. */ if (!term_match) { term_match = m; term_result = false; } else if (!same_field(term_match->data, term_match->size, m->data, m->size)) { if (!term_result) found = false; term_match = m; term_result = false; } for (k = 0; k < n; k++) if (c->entry.items[k].hash == m->le_hash) break; if (k >= n) { /* Hmm, didn't find any field that * matched this rule, so ignore this * match. Go on with next match */ continue; } term_result = true; /* Hmm, so, this field matched, let's remember * where we'd have to try next, in case the other * matches are not OK */ r = journal_file_next_entry_for_data(f, c, cp, le64toh(c->entry.items[k].object_offset), direction, &qo, &q); /* This pointer is invalidated if the window was * remapped. May need to re-fetch it later */ c = NULL; if (r < 0) return r; if (r > 0) { if (direction == DIRECTION_DOWN) { if (q > np) { np = q; npo = qo; } } else { if (np == 0 || q < np) { np = q; npo = qo; } } } } /* Check the last term */ if (term_match && !term_result) found = false; /* Did this entry match against all matches? */ if (found) { if (ret) { if (c == NULL) { /* Re-fetch the entry */ r = journal_file_move_to_object(f, OBJECT_ENTRY, cp, &c); if (r < 0) return r; } *ret = c; } if (offset) *offset = cp; return 1; } /* Did we find a subsequent entry? */ if (np == 0) return 0; /* Hmm, ok, this entry only matched partially, so * let's try another one */ cp = np; c = npo; } } static int next_beyond_location(sd_journal *j, JournalFile *f, direction_t direction, Object **ret, uint64_t *offset) { Object *c; uint64_t cp; int compare_value, r; assert(j); assert(f); if (f->current_offset > 0) { cp = f->current_offset; r = journal_file_move_to_object(f, OBJECT_ENTRY, cp, &c); if (r < 0) return r; r = next_with_matches(j, f, direction, &c, &cp); if (r <= 0) return r; compare_value = 1; } else { r = find_location(j, f, direction, &c, &cp); if (r <= 0) return r; compare_value = 0; } for (;;) { bool found; if (j->current_location.type == LOCATION_DISCRETE) { int k; k = compare_with_location(f, c, &j->current_location); if (direction == DIRECTION_DOWN) found = k >= compare_value; else found = k <= -compare_value; } else found = true; if (found) { if (ret) *ret = c; if (offset) *offset = cp; return 1; } r = next_with_matches(j, f, direction, &c, &cp); if (r <= 0) return r; } } static int real_journal_next(sd_journal *j, direction_t direction) { JournalFile *f, *new_current = NULL; Iterator i; int r; uint64_t new_offset = 0; Object *new_entry = NULL; if (!j) return -EINVAL; HASHMAP_FOREACH(f, j->files, i) { Object *o; uint64_t p; bool found; r = next_beyond_location(j, f, direction, &o, &p); if (r < 0) { log_debug("Can't iterate through %s, ignoring: %s", f->path, strerror(-r)); continue; } else if (r == 0) continue; if (!new_current) found = true; else { int k; k = compare_order(f, o, new_current, new_entry); if (direction == DIRECTION_DOWN) found = k < 0; else found = k > 0; } if (found) { new_current = f; new_entry = o; new_offset = p; } } if (!new_current) return 0; set_location(j, new_current, new_entry, new_offset); return 1; } _public_ int sd_journal_next(sd_journal *j) { return real_journal_next(j, DIRECTION_DOWN); } _public_ int sd_journal_previous(sd_journal *j) { return real_journal_next(j, DIRECTION_UP); } static int real_journal_next_skip(sd_journal *j, direction_t direction, uint64_t skip) { int c = 0, r; if (!j) return -EINVAL; if (skip == 0) { /* If this is not a discrete skip, then at least * resolve the current location */ if (j->current_location.type != LOCATION_DISCRETE) return real_journal_next(j, direction); return 0; } do { r = real_journal_next(j, direction); if (r < 0) return r; if (r == 0) return c; skip--; c++; } while (skip > 0); return c; } _public_ int sd_journal_next_skip(sd_journal *j, uint64_t skip) { return real_journal_next_skip(j, DIRECTION_DOWN, skip); } _public_ int sd_journal_previous_skip(sd_journal *j, uint64_t skip) { return real_journal_next_skip(j, DIRECTION_UP, skip); } _public_ int sd_journal_get_cursor(sd_journal *j, char **cursor) { Object *o; int r; char bid[33], sid[33]; if (!j) return -EINVAL; if (!cursor) return -EINVAL; if (!j->current_file || j->current_file->current_offset <= 0) return -EADDRNOTAVAIL; r = journal_file_move_to_object(j->current_file, OBJECT_ENTRY, j->current_file->current_offset, &o); if (r < 0) return r; sd_id128_to_string(j->current_file->header->seqnum_id, sid); sd_id128_to_string(o->entry.boot_id, bid); if (asprintf(cursor, "s=%s;i=%llx;b=%s;m=%llx;t=%llx;x=%llx;p=%s", sid, (unsigned long long) le64toh(o->entry.seqnum), bid, (unsigned long long) le64toh(o->entry.monotonic), (unsigned long long) le64toh(o->entry.realtime), (unsigned long long) le64toh(o->entry.xor_hash), path_get_file_name(j->current_file->path)) < 0) return -ENOMEM; return 1; } _public_ int sd_journal_seek_cursor(sd_journal *j, const char *cursor) { char *w; size_t l; char *state; unsigned long long seqnum, monotonic, realtime, xor_hash; bool seqnum_id_set = false, seqnum_set = false, boot_id_set = false, monotonic_set = false, realtime_set = false, xor_hash_set = false; sd_id128_t seqnum_id, boot_id; if (!j) return -EINVAL; if (!cursor) return -EINVAL; FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) { char *item; int k = 0; if (l < 2 || w[1] != '=') return -EINVAL; item = strndup(w, l); if (!item) return -ENOMEM; switch (w[0]) { case 's': seqnum_id_set = true; k = sd_id128_from_string(w+2, &seqnum_id); break; case 'i': seqnum_set = true; if (sscanf(w+2, "%llx", &seqnum) != 1) k = -EINVAL; break; case 'b': boot_id_set = true; k = sd_id128_from_string(w+2, &boot_id); break; case 'm': monotonic_set = true; if (sscanf(w+2, "%llx", &monotonic) != 1) k = -EINVAL; break; case 't': realtime_set = true; if (sscanf(w+2, "%llx", &realtime) != 1) k = -EINVAL; break; case 'x': xor_hash_set = true; if (sscanf(w+2, "%llx", &xor_hash) != 1) k = -EINVAL; break; } free(item); if (k < 0) return k; } if ((!seqnum_set || !seqnum_id_set) && (!monotonic_set || !boot_id_set) && !realtime_set) return -EINVAL; reset_location(j); j->current_location.type = LOCATION_DISCRETE; if (realtime_set) { j->current_location.realtime = (uint64_t) realtime; j->current_location.realtime_set = true; } if (seqnum_set && seqnum_id_set) { j->current_location.seqnum = (uint64_t) seqnum; j->current_location.seqnum_id = seqnum_id; j->current_location.seqnum_set = true; } if (monotonic_set && boot_id_set) { j->current_location.monotonic = (uint64_t) monotonic; j->current_location.boot_id = boot_id; j->current_location.monotonic_set = true; } if (xor_hash_set) { j->current_location.xor_hash = (uint64_t) xor_hash; j->current_location.xor_hash_set = true; } return 0; } _public_ int sd_journal_seek_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t usec) { if (!j) return -EINVAL; reset_location(j); j->current_location.type = LOCATION_DISCRETE; j->current_location.boot_id = boot_id; j->current_location.monotonic = usec; j->current_location.monotonic_set = true; return 0; } _public_ int sd_journal_seek_realtime_usec(sd_journal *j, uint64_t usec) { if (!j) return -EINVAL; reset_location(j); j->current_location.type = LOCATION_DISCRETE; j->current_location.realtime = usec; j->current_location.realtime_set = true; return 0; } _public_ int sd_journal_seek_head(sd_journal *j) { if (!j) return -EINVAL; reset_location(j); j->current_location.type = LOCATION_HEAD; return 0; } _public_ int sd_journal_seek_tail(sd_journal *j) { if (!j) return -EINVAL; reset_location(j); j->current_location.type = LOCATION_TAIL; return 0; } static int add_file(sd_journal *j, const char *prefix, const char *filename) { char *path; int r; JournalFile *f; assert(j); assert(prefix); assert(filename); if ((j->flags & SD_JOURNAL_SYSTEM_ONLY) && !(streq(filename, "system.journal") || (startswith(filename, "system@") && endswith(filename, ".journal")))) return 0; path = join(prefix, "/", filename, NULL); if (!path) return -ENOMEM; if (hashmap_get(j->files, path)) { free(path); return 0; } if (hashmap_size(j->files) >= JOURNAL_FILES_MAX) { log_debug("Too many open journal files, not adding %s, ignoring.", path); free(path); return 0; } r = journal_file_open(path, O_RDONLY, 0, NULL, &f); free(path); if (r < 0) { if (errno == ENOENT) return 0; return r; } /* journal_file_dump(f); */ r = hashmap_put(j->files, f->path, f); if (r < 0) { journal_file_close(f); return r; } j->current_invalidate_counter ++; log_debug("File %s got added.", f->path); return 0; } static int remove_file(sd_journal *j, const char *prefix, const char *filename) { char *path; JournalFile *f; assert(j); assert(prefix); assert(filename); path = join(prefix, "/", filename, NULL); if (!path) return -ENOMEM; f = hashmap_get(j->files, path); free(path); if (!f) return 0; hashmap_remove(j->files, f->path); journal_file_close(f); j->current_invalidate_counter ++; log_debug("File %s got removed.", f->path); return 0; } static int add_directory(sd_journal *j, const char *prefix, const char *dirname) { char *path; int r; DIR *d; sd_id128_t id, mid; Directory *m; assert(j); assert(prefix); assert(dirname); if ((j->flags & SD_JOURNAL_LOCAL_ONLY) && (sd_id128_from_string(dirname, &id) < 0 || sd_id128_get_machine(&mid) < 0 || !sd_id128_equal(id, mid))) return 0; path = join(prefix, "/", dirname, NULL); if (!path) return -ENOMEM; d = opendir(path); if (!d) { log_debug("Failed to open %s: %m", path); free(path); if (errno == ENOENT) return 0; return -errno; } m = hashmap_get(j->directories_by_path, path); if (!m) { m = new0(Directory, 1); if (!m) { closedir(d); free(path); return -ENOMEM; } m->is_root = false; m->path = path; if (hashmap_put(j->directories_by_path, m->path, m) < 0) { closedir(d); free(m->path); free(m); return -ENOMEM; } j->current_invalidate_counter ++; log_debug("Directory %s got added.", m->path); } else if (m->is_root) { free (path); closedir(d); return 0; } else free(path); if (m->wd <= 0 && j->inotify_fd >= 0) { m->wd = inotify_add_watch(j->inotify_fd, m->path, IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE| IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT| IN_DONT_FOLLOW|IN_ONLYDIR); if (m->wd > 0 && hashmap_put(j->directories_by_wd, INT_TO_PTR(m->wd), m) < 0) inotify_rm_watch(j->inotify_fd, m->wd); } for (;;) { struct dirent buf, *de; r = readdir_r(d, &buf, &de); if (r != 0 || !de) break; if (dirent_is_file_with_suffix(de, ".journal")) { r = add_file(j, m->path, de->d_name); if (r < 0) log_debug("Failed to add file %s/%s: %s", m->path, de->d_name, strerror(-r)); } } closedir(d); return 0; } static int add_root_directory(sd_journal *j, const char *p) { DIR *d; Directory *m; int r; assert(j); assert(p); if ((j->flags & SD_JOURNAL_RUNTIME_ONLY) && !path_startswith(p, "/run")) return -EINVAL; d = opendir(p); if (!d) return -errno; m = hashmap_get(j->directories_by_path, p); if (!m) { m = new0(Directory, 1); if (!m) { closedir(d); return -ENOMEM; } m->is_root = true; m->path = strdup(p); if (!m->path) { closedir(d); free(m); return -ENOMEM; } if (hashmap_put(j->directories_by_path, m->path, m) < 0) { closedir(d); free(m->path); free(m); return -ENOMEM; } j->current_invalidate_counter ++; log_debug("Root directory %s got added.", m->path); } else if (!m->is_root) { closedir(d); return 0; } if (m->wd <= 0 && j->inotify_fd >= 0) { m->wd = inotify_add_watch(j->inotify_fd, m->path, IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB|IN_DELETE| IN_DONT_FOLLOW|IN_ONLYDIR); if (m->wd > 0 && hashmap_put(j->directories_by_wd, INT_TO_PTR(m->wd), m) < 0) inotify_rm_watch(j->inotify_fd, m->wd); } for (;;) { struct dirent buf, *de; sd_id128_t id; r = readdir_r(d, &buf, &de); if (r != 0 || !de) break; if (dirent_is_file_with_suffix(de, ".journal")) { r = add_file(j, m->path, de->d_name); if (r < 0) log_debug("Failed to add file %s/%s: %s", m->path, de->d_name, strerror(-r)); } else if ((de->d_type == DT_DIR || de->d_type == DT_UNKNOWN) && sd_id128_from_string(de->d_name, &id) >= 0) { r = add_directory(j, m->path, de->d_name); if (r < 0) log_debug("Failed to add directory %s/%s: %s", m->path, de->d_name, strerror(-r)); } } closedir(d); return 0; } static int remove_directory(sd_journal *j, Directory *d) { assert(j); if (d->wd > 0) { hashmap_remove(j->directories_by_wd, INT_TO_PTR(d->wd)); if (j->inotify_fd >= 0) inotify_rm_watch(j->inotify_fd, d->wd); } hashmap_remove(j->directories_by_path, d->path); if (d->is_root) log_debug("Root directory %s got removed.", d->path); else log_debug("Directory %s got removed.", d->path); free(d->path); free(d); return 0; } static int add_search_paths(sd_journal *j) { const char search_paths[] = "/run/log/journal\0" "/var/log/journal\0"; const char *p; assert(j); /* We ignore most errors here, since the idea is to only open * what's actually accessible, and ignore the rest. */ NULSTR_FOREACH(p, search_paths) add_root_directory(j, p); return 0; } static int allocate_inotify(sd_journal *j) { assert(j); if (j->inotify_fd < 0) { j->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); if (j->inotify_fd < 0) return -errno; } if (!j->directories_by_wd) { j->directories_by_wd = hashmap_new(trivial_hash_func, trivial_compare_func); if (!j->directories_by_wd) return -ENOMEM; } return 0; } static sd_journal *journal_new(int flags) { sd_journal *j; j = new0(sd_journal, 1); if (!j) return NULL; j->inotify_fd = -1; j->flags = flags; j->files = hashmap_new(string_hash_func, string_compare_func); if (!j->files) { free(j); return NULL; } j->directories_by_path = hashmap_new(string_hash_func, string_compare_func); if (!j->directories_by_path) { hashmap_free(j->files); free(j); return NULL; } return j; } _public_ int sd_journal_open(sd_journal **ret, int flags) { sd_journal *j; int r; if (!ret) return -EINVAL; if (flags & ~(SD_JOURNAL_LOCAL_ONLY| SD_JOURNAL_RUNTIME_ONLY| SD_JOURNAL_SYSTEM_ONLY)) return -EINVAL; j = journal_new(flags); if (!j) return -ENOMEM; r = add_search_paths(j); if (r < 0) goto fail; *ret = j; return 0; fail: sd_journal_close(j); return r; } _public_ int sd_journal_open_directory(sd_journal **ret, const char *path, int flags) { sd_journal *j; int r; if (!ret) return -EINVAL; if (!path || !path_is_absolute(path)) return -EINVAL; if (flags != 0) return -EINVAL; j = journal_new(flags); if (!j) return -ENOMEM; r = add_root_directory(j, path); if (r < 0) goto fail; *ret = j; return 0; fail: sd_journal_close(j); return r; } _public_ void sd_journal_close(sd_journal *j) { Directory *d; JournalFile *f; if (!j) return; while ((f = hashmap_steal_first(j->files))) journal_file_close(f); hashmap_free(j->files); while ((d = hashmap_first(j->directories_by_path))) remove_directory(j, d); while ((d = hashmap_first(j->directories_by_wd))) remove_directory(j, d); hashmap_free(j->directories_by_path); hashmap_free(j->directories_by_wd); if (j->inotify_fd >= 0) close_nointr_nofail(j->inotify_fd); sd_journal_flush_matches(j); free(j); } _public_ int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *ret) { Object *o; JournalFile *f; int r; if (!j) return -EINVAL; if (!ret) return -EINVAL; f = j->current_file; if (!f) return -EADDRNOTAVAIL; if (f->current_offset <= 0) return -EADDRNOTAVAIL; r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o); if (r < 0) return r; *ret = le64toh(o->entry.realtime); return 0; } _public_ int sd_journal_get_monotonic_usec(sd_journal *j, uint64_t *ret, sd_id128_t *ret_boot_id) { Object *o; JournalFile *f; int r; sd_id128_t id; if (!j) return -EINVAL; f = j->current_file; if (!f) return -EADDRNOTAVAIL; if (f->current_offset <= 0) return -EADDRNOTAVAIL; r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o); if (r < 0) return r; if (ret_boot_id) *ret_boot_id = o->entry.boot_id; else { r = sd_id128_get_boot(&id); if (r < 0) return r; if (!sd_id128_equal(id, o->entry.boot_id)) return -ESTALE; } if (ret) *ret = le64toh(o->entry.monotonic); return 0; } _public_ int sd_journal_get_data(sd_journal *j, const char *field, const void **data, size_t *size) { JournalFile *f; uint64_t i, n; size_t field_length; int r; Object *o; if (!j) return -EINVAL; if (!field) return -EINVAL; if (!data) return -EINVAL; if (!size) return -EINVAL; if (isempty(field) || strchr(field, '=')) return -EINVAL; f = j->current_file; if (!f) return -EADDRNOTAVAIL; if (f->current_offset <= 0) return -EADDRNOTAVAIL; r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o); if (r < 0) return r; field_length = strlen(field); n = journal_file_entry_n_items(o); for (i = 0; i < n; i++) { uint64_t p, l; le64_t le_hash; size_t t; p = le64toh(o->entry.items[i].object_offset); le_hash = o->entry.items[i].hash; r = journal_file_move_to_object(f, OBJECT_DATA, p, &o); if (r < 0) return r; if (le_hash != o->data.hash) return -EBADMSG; l = le64toh(o->object.size) - offsetof(Object, data.payload); if (o->object.flags & OBJECT_COMPRESSED) { #ifdef HAVE_XZ if (uncompress_startswith(o->data.payload, l, &f->compress_buffer, &f->compress_buffer_size, field, field_length, '=')) { uint64_t rsize; if (!uncompress_blob(o->data.payload, l, &f->compress_buffer, &f->compress_buffer_size, &rsize)) return -EBADMSG; *data = f->compress_buffer; *size = (size_t) rsize; return 0; } #else return -EPROTONOSUPPORT; #endif } else if (l >= field_length+1 && memcmp(o->data.payload, field, field_length) == 0 && o->data.payload[field_length] == '=') { t = (size_t) l; if ((uint64_t) t != l) return -E2BIG; *data = o->data.payload; *size = t; return 0; } r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o); if (r < 0) return r; } return -ENOENT; } _public_ int sd_journal_enumerate_data(sd_journal *j, const void **data, size_t *size) { JournalFile *f; uint64_t p, l, n; le64_t le_hash; int r; Object *o; size_t t; if (!j) return -EINVAL; if (!data) return -EINVAL; if (!size) return -EINVAL; f = j->current_file; if (!f) return -EADDRNOTAVAIL; if (f->current_offset <= 0) return -EADDRNOTAVAIL; r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o); if (r < 0) return r; n = journal_file_entry_n_items(o); if (j->current_field >= n) return 0; p = le64toh(o->entry.items[j->current_field].object_offset); le_hash = o->entry.items[j->current_field].hash; r = journal_file_move_to_object(f, OBJECT_DATA, p, &o); if (r < 0) return r; if (le_hash != o->data.hash) return -EBADMSG; l = le64toh(o->object.size) - offsetof(Object, data.payload); t = (size_t) l; /* We can't read objects larger than 4G on a 32bit machine */ if ((uint64_t) t != l) return -E2BIG; if (o->object.flags & OBJECT_COMPRESSED) { #ifdef HAVE_XZ uint64_t rsize; if (!uncompress_blob(o->data.payload, l, &f->compress_buffer, &f->compress_buffer_size, &rsize)) return -EBADMSG; *data = f->compress_buffer; *size = (size_t) rsize; #else return -EPROTONOSUPPORT; #endif } else { *data = o->data.payload; *size = t; } j->current_field ++; return 1; } _public_ void sd_journal_restart_data(sd_journal *j) { if (!j) return; j->current_field = 0; } _public_ int sd_journal_get_fd(sd_journal *j) { int r; if (!j) return -EINVAL; if (j->inotify_fd >= 0) return j->inotify_fd; r = allocate_inotify(j); if (r < 0) return r; /* Iterate through all dirs again, to add them to the * inotify */ r = add_search_paths(j); if (r < 0) return r; return j->inotify_fd; } static void process_inotify_event(sd_journal *j, struct inotify_event *e) { Directory *d; int r; assert(j); assert(e); /* Is this a subdirectory we watch? */ d = hashmap_get(j->directories_by_wd, INT_TO_PTR(e->wd)); if (d) { sd_id128_t id; if (!(e->mask & IN_ISDIR) && e->len > 0 && endswith(e->name, ".journal")) { /* Event for a journal file */ if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) { r = add_file(j, d->path, e->name); if (r < 0) log_debug("Failed to add file %s/%s: %s", d->path, e->name, strerror(-r)); } else if (e->mask & (IN_DELETE|IN_UNMOUNT)) { r = remove_file(j, d->path, e->name); if (r < 0) log_debug("Failed to remove file %s/%s: %s", d->path, e->name, strerror(-r)); } } else if (!d->is_root && e->len == 0) { /* Event for a subdirectory */ if (e->mask & (IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT)) { r = remove_directory(j, d); if (r < 0) log_debug("Failed to remove directory %s: %s", d->path, strerror(-r)); } } else if (d->is_root && (e->mask & IN_ISDIR) && e->len > 0 && sd_id128_from_string(e->name, &id) >= 0) { /* Event for root directory */ if (e->mask & (IN_CREATE|IN_MOVED_TO|IN_MODIFY|IN_ATTRIB)) { r = add_directory(j, d->path, e->name); if (r < 0) log_debug("Failed to add directory %s/%s: %s", d->path, e->name, strerror(-r)); } } return; } if (e->mask & IN_IGNORED) return; log_warning("Unknown inotify event."); } static int determine_change(sd_journal *j) { bool b; assert(j); b = j->current_invalidate_counter != j->last_invalidate_counter; j->last_invalidate_counter = j->current_invalidate_counter; return b ? SD_JOURNAL_INVALIDATE : SD_JOURNAL_APPEND; } _public_ int sd_journal_process(sd_journal *j) { uint8_t buffer[sizeof(struct inotify_event) + FILENAME_MAX]; bool got_something = false; if (!j) return -EINVAL; for (;;) { struct inotify_event *e; ssize_t l; l = read(j->inotify_fd, buffer, sizeof(buffer)); if (l < 0) { if (errno == EAGAIN || errno == EINTR) return got_something ? determine_change(j) : SD_JOURNAL_NOP; return -errno; } got_something = true; e = (struct inotify_event*) buffer; while (l > 0) { size_t step; process_inotify_event(j, e); step = sizeof(struct inotify_event) + e->len; assert(step <= (size_t) l); e = (struct inotify_event*) ((uint8_t*) e + step); l -= step; } } return determine_change(j); } _public_ int sd_journal_wait(sd_journal *j, uint64_t timeout_usec) { int r; assert(j); if (j->inotify_fd < 0) { /* This is the first invocation, hence create the * inotify watch */ r = sd_journal_get_fd(j); if (r < 0) return r; /* The journal might have changed since the context * object was created and we weren't watching before, * hence don't wait for anything, and return * immediately. */ return determine_change(j); } do { r = fd_wait_for_event(j->inotify_fd, POLLIN, timeout_usec); } while (r == -EINTR); if (r < 0) return r; return sd_journal_process(j); } _public_ int sd_journal_get_cutoff_realtime_usec(sd_journal *j, uint64_t *from, uint64_t *to) { Iterator i; JournalFile *f; bool first = true; int r; if (!j) return -EINVAL; if (!from && !to) return -EINVAL; HASHMAP_FOREACH(f, j->files, i) { usec_t fr, t; r = journal_file_get_cutoff_realtime_usec(f, &fr, &t); if (r < 0) return r; if (r == 0) continue; if (first) { if (from) *from = fr; if (to) *to = t; first = false; } else { if (from) *from = MIN(fr, *from); if (to) *to = MIN(t, *to); } } return first ? 0 : 1; } _public_ int sd_journal_get_cutoff_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t *from, uint64_t *to) { Iterator i; JournalFile *f; bool first = true; int r; if (!j) return -EINVAL; if (!from && !to) return -EINVAL; HASHMAP_FOREACH(f, j->files, i) { usec_t fr, t; r = journal_file_get_cutoff_monotonic_usec(f, boot_id, &fr, &t); if (r < 0) return r; if (r == 0) continue; if (first) { if (from) *from = fr; if (to) *to = t; first = false; } else { if (from) *from = MIN(fr, *from); if (to) *to = MIN(t, *to); } } return first ? 0 : 1; } /* _public_ int sd_journal_query_unique(sd_journal *j, const char *field) { */ /* if (!j) */ /* return -EINVAL; */ /* if (!field) */ /* return -EINVAL; */ /* return -ENOTSUP; */ /* } */ /* _public_ int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *l) { */ /* if (!j) */ /* return -EINVAL; */ /* if (!data) */ /* return -EINVAL; */ /* if (!l) */ /* return -EINVAL; */ /* return -ENOTSUP; */ /* } */ /* _public_ void sd_journal_restart_unique(sd_journal *j) { */ /* if (!j) */ /* return; */ /* } */