X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fjournal%2Fsd-journal.c;h=9d381e044cf77b636d6b2bccaea3251c51637a90;hp=4095830901b30359fcd2e5218d1a96aa7220c8ca;hb=5430f7f2bc7330f3088b894166bf3524a067e3d8;hpb=6ad1d1c30621280bfad3e63fcc1c7ceb7d8ffa98

diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c
index 409583090..9d381e044 100644
--- a/src/journal/sd-journal.c
+++ b/src/journal/sd-journal.c
@@ -6,16 +6,16 @@
   Copyright 2011 Lennart Poettering
 
   systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 2 of the License, or
+  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
-  General Public License for more details.
+  Lesser General Public License for more details.
 
-  You should have received a copy of the GNU General Public License
+  You should have received a copy of the GNU Lesser General Public License
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
@@ -32,58 +32,10 @@
 #include "list.h"
 #include "lookup3.h"
 #include "compress.h"
+#include "journal-internal.h"
 
 #define JOURNAL_FILES_MAX 1024
 
-typedef struct Match Match;
-
-struct Match {
-        char *data;
-        size_t size;
-        uint64_t le_hash;
-
-        LIST_FIELDS(Match, matches);
-};
-
-typedef enum location_type {
-        LOCATION_HEAD,
-        LOCATION_TAIL,
-        LOCATION_DISCRETE
-} location_type_t;
-
-typedef struct Location {
-        location_type_t type;
-
-        uint64_t seqnum;
-        sd_id128_t seqnum_id;
-        bool seqnum_set;
-
-        uint64_t realtime;
-        bool realtime_set;
-
-        uint64_t monotonic;
-        sd_id128_t boot_id;
-        bool monotonic_set;
-
-        uint64_t xor_hash;
-        bool xor_hash_set;
-} Location;
-
-struct sd_journal {
-        Hashmap *files;
-
-        Location current_location;
-        JournalFile *current_file;
-        uint64_t current_field;
-
-        int inotify_fd;
-        Hashmap *inotify_wd_dirs;
-        Hashmap *inotify_wd_roots;
-
-        LIST_HEAD(Match, matches);
-        unsigned n_matches;
-};
-
 static void detach_location(sd_journal *j) {
         Iterator i;
         JournalFile *f;
@@ -114,7 +66,7 @@ static void init_location(Location *l, JournalFile *f, Object *o) {
         l->seqnum_id = f->header->seqnum_id;
         l->realtime = le64toh(o->entry.realtime);
         l->monotonic = le64toh(o->entry.monotonic);
-        l->boot_id = le64toh(o->entry.boot_id);
+        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;
@@ -154,17 +106,17 @@ static int same_field(const void *_a, size_t s, const void *_b, size_t t) {
         return -EINVAL;
 }
 
-int sd_journal_add_match(sd_journal *j, const void *data, size_t size) {
+_public_ int sd_journal_add_match(sd_journal *j, const void *data, size_t size) {
         Match *m, *after = NULL;
-        uint64_t le_hash;
-
-        assert(j);
+        le64_t le_hash;
 
+        if (!j)
+                return -EINVAL;
+        if (!data)
+                return -EINVAL;
         if (size <= 0)
                 return -EINVAL;
 
-        assert(data);
-
         le_hash = htole64(hash64(data, size));
 
         LIST_FOREACH(matches, m, j->matches) {
@@ -207,8 +159,9 @@ int sd_journal_add_match(sd_journal *j, const void *data, size_t size) {
         return 0;
 }
 
-void sd_journal_flush_matches(sd_journal *j) {
-        assert(j);
+_public_ void sd_journal_flush_matches(sd_journal *j) {
+        if (!j)
+                return;
 
         while (j->matches) {
                 Match *m = j->matches;
@@ -372,9 +325,17 @@ static int find_location(sd_journal *j, JournalFile *f, direction_t direction, O
                 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)
+                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);
-                else if (j->current_location.realtime_set)
+
+                        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);
@@ -396,14 +357,14 @@ static int find_location(sd_journal *j, JournalFile *f, direction_t direction, O
 
                         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;
+                                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, m->le_hash, &d, &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;
 
@@ -419,6 +380,9 @@ static int find_location(sd_journal *j, JournalFile *f, direction_t direction, O
                         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;
 
@@ -437,7 +401,7 @@ static int find_location(sd_journal *j, JournalFile *f, direction_t direction, O
                                             (direction == DIRECTION_DOWN && cp < tp) ||
                                             (direction == DIRECTION_UP && cp > tp)) {
                                                 to = c;
-                                                tp = tp;
+                                                tp = cp;
                                         }
 
                                 }
@@ -532,7 +496,7 @@ static int next_with_matches(sd_journal *j, JournalFile *f, direction_t directio
 
                 /* Make sure we don't match the entry we are starting
                  * from. */
-                found = cp > *offset;
+                found = cp != *offset;
 
                 np = 0;
                 LIST_FOREACH(matches, m, j->matches) {
@@ -571,6 +535,12 @@ static int next_with_matches(sd_journal *j, JournalFile *f, direction_t directio
                          * 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) {
@@ -593,8 +563,15 @@ static int next_with_matches(sd_journal *j, JournalFile *f, direction_t directio
 
                 /* Did this entry match against all matches? */
                 if (found) {
-                        if (ret)
+                        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;
@@ -674,7 +651,8 @@ static int real_journal_next(sd_journal *j, direction_t direction) {
         uint64_t new_offset = 0;
         Object *new_entry = NULL;
 
-        assert(j);
+        if (!j)
+                return -EINVAL;
 
         HASHMAP_FOREACH(f, j->files, i) {
                 Object *o;
@@ -715,21 +693,31 @@ static int real_journal_next(sd_journal *j, direction_t direction) {
         return 1;
 }
 
-int sd_journal_next(sd_journal *j) {
+_public_ int sd_journal_next(sd_journal *j) {
         return real_journal_next(j, DIRECTION_DOWN);
 }
 
-int sd_journal_previous(sd_journal *j) {
+_public_ int sd_journal_previous(sd_journal *j) {
         return real_journal_next(j, DIRECTION_UP);
 }
 
-int sd_journal_next_skip(sd_journal *j, uint64_t skip) {
+static int real_journal_next_skip(sd_journal *j, direction_t direction, uint64_t skip) {
         int c = 0, r;
 
-        assert(j);
+        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);
 
-        while (skip > 0) {
-                r = sd_journal_next(j);
+                return 0;
+        }
+
+        do {
+                r = real_journal_next(j, direction);
                 if (r < 0)
                         return r;
 
@@ -738,38 +726,28 @@ int sd_journal_next_skip(sd_journal *j, uint64_t skip) {
 
                 skip--;
                 c++;
-        }
+        } while (skip > 0);
 
         return c;
 }
 
-int sd_journal_previous_skip(sd_journal *j, uint64_t skip) {
-        int c = 0, r;
-
-        assert(j);
-
-        while (skip > 0) {
-                r = sd_journal_previous(j);
-                if (r < 0)
-                        return r;
-
-                if (r == 0)
-                        return c;
-
-                skip--;
-                c++;
-        }
+_public_ int sd_journal_next_skip(sd_journal *j, uint64_t skip) {
+        return real_journal_next_skip(j, DIRECTION_DOWN, skip);
+}
 
-        return 1;
+_public_ int sd_journal_previous_skip(sd_journal *j, uint64_t skip) {
+        return real_journal_next_skip(j, DIRECTION_UP, skip);
 }
 
-int sd_journal_get_cursor(sd_journal *j, char **cursor) {
+_public_ int sd_journal_get_cursor(sd_journal *j, char **cursor) {
         Object *o;
         int r;
         char bid[33], sid[33];
 
-        assert(j);
-        assert(cursor);
+        if (!j)
+                return -EINVAL;
+        if (!cursor)
+                return -EINVAL;
 
         if (!j->current_file || j->current_file->current_offset <= 0)
                 return -EADDRNOTAVAIL;
@@ -793,7 +771,7 @@ int sd_journal_get_cursor(sd_journal *j, char **cursor) {
         return 1;
 }
 
-int sd_journal_seek_cursor(sd_journal *j, const char *cursor) {
+_public_ int sd_journal_seek_cursor(sd_journal *j, const char *cursor) {
         char *w;
         size_t l;
         char *state;
@@ -807,8 +785,10 @@ int sd_journal_seek_cursor(sd_journal *j, const char *cursor) {
                 xor_hash_set = false;
         sd_id128_t seqnum_id, boot_id;
 
-        assert(j);
-        assert(cursor);
+        if (!j)
+                return -EINVAL;
+        if (!cursor)
+                return -EINVAL;
 
         FOREACH_WORD_SEPARATOR(w, l, cursor, ";", state) {
                 char *item;
@@ -898,8 +878,9 @@ int sd_journal_seek_cursor(sd_journal *j, const char *cursor) {
         return 0;
 }
 
-int sd_journal_seek_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t usec) {
-        assert(j);
+_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;
@@ -910,8 +891,9 @@ int sd_journal_seek_monotonic_usec(sd_journal *j, sd_id128_t boot_id, uint64_t u
         return 0;
 }
 
-int sd_journal_seek_realtime_usec(sd_journal *j, uint64_t usec) {
-        assert(j);
+_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;
@@ -921,8 +903,9 @@ int sd_journal_seek_realtime_usec(sd_journal *j, uint64_t usec) {
         return 0;
 }
 
-int sd_journal_seek_head(sd_journal *j) {
-        assert(j);
+_public_ int sd_journal_seek_head(sd_journal *j) {
+        if (!j)
+                return -EINVAL;
 
         reset_location(j);
         j->current_location.type = LOCATION_HEAD;
@@ -930,8 +913,9 @@ int sd_journal_seek_head(sd_journal *j) {
         return 0;
 }
 
-int sd_journal_seek_tail(sd_journal *j) {
-        assert(j);
+_public_ int sd_journal_seek_tail(sd_journal *j) {
+        if (!j)
+                return -EINVAL;
 
         reset_location(j);
         j->current_location.type = LOCATION_TAIL;
@@ -948,6 +932,10 @@ static int add_file(sd_journal *j, const char *prefix, const char *dir, const ch
         assert(prefix);
         assert(filename);
 
+        if ((j->flags & SD_JOURNAL_SYSTEM_ONLY) &&
+            !startswith(filename, "system.journal"))
+                return 0;
+
         if (dir)
                 fn = join(prefix, "/", dir, "/", filename, NULL);
         else
@@ -1024,11 +1012,18 @@ static int add_directory(sd_journal *j, const char *prefix, const char *dir) {
         int r;
         DIR *d;
         int wd;
+        sd_id128_t id, mid;
 
         assert(j);
         assert(prefix);
         assert(dir);
 
+        if ((j->flags & SD_JOURNAL_LOCAL_ONLY) &&
+            (sd_id128_from_string(dir, &id) < 0 ||
+             sd_id128_get_machine(&mid) < 0 ||
+             !sd_id128_equal(id, mid)))
+            return 0;
+
         fn = join(prefix, "/", dir, NULL);
         if (!fn)
                 return -ENOMEM;
@@ -1132,7 +1127,7 @@ static void remove_root_wd(sd_journal *j, int wd) {
         }
 }
 
-int sd_journal_open(sd_journal **ret) {
+_public_ int sd_journal_open(sd_journal **ret, int flags) {
         sd_journal *j;
         const char *p;
         const char search_paths[] =
@@ -1140,12 +1135,20 @@ int sd_journal_open(sd_journal **ret) {
                 "/var/log/journal\0";
         int r;
 
-        assert(ret);
+        if (!ret)
+                return -EINVAL;
+
+        if (flags & ~(SD_JOURNAL_LOCAL_ONLY|
+                      SD_JOURNAL_RUNTIME_ONLY|
+                      SD_JOURNAL_SYSTEM_ONLY))
+                return -EINVAL;
 
         j = new0(sd_journal, 1);
         if (!j)
                 return -ENOMEM;
 
+        j->flags = flags;
+
         j->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
         if (j->inotify_fd < 0) {
                 r = -errno;
@@ -1172,6 +1175,10 @@ int sd_journal_open(sd_journal **ret) {
         NULSTR_FOREACH(p, search_paths) {
                 DIR *d;
 
+                if ((flags & SD_JOURNAL_RUNTIME_ONLY) &&
+                    !path_startswith(p, "/run"))
+                        continue;
+
                 d = opendir(p);
                 if (!d) {
                         if (errno != ENOENT)
@@ -1215,8 +1222,9 @@ fail:
         return r;
 };
 
-void sd_journal_close(sd_journal *j) {
-        assert(j);
+_public_ void sd_journal_close(sd_journal *j) {
+        if (!j)
+                return;
 
         if (j->inotify_wd_dirs) {
                 void *k;
@@ -1253,13 +1261,15 @@ void sd_journal_close(sd_journal *j) {
         free(j);
 }
 
-int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *ret) {
+_public_ int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *ret) {
         Object *o;
         JournalFile *f;
         int r;
 
-        assert(j);
-        assert(ret);
+        if (!j)
+                return -EINVAL;
+        if (!ret)
+                return -EINVAL;
 
         f = j->current_file;
         if (!f)
@@ -1276,14 +1286,16 @@ int sd_journal_get_realtime_usec(sd_journal *j, uint64_t *ret) {
         return 0;
 }
 
-int sd_journal_get_monotonic_usec(sd_journal *j, uint64_t *ret, sd_id128_t *ret_boot_id) {
+_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;
 
-        assert(j);
-        assert(ret);
+        if (!j)
+                return -EINVAL;
+        if (!ret)
+                return -EINVAL;
 
         f = j->current_file;
         if (!f)
@@ -1304,24 +1316,28 @@ int sd_journal_get_monotonic_usec(sd_journal *j, uint64_t *ret, sd_id128_t *ret_
                         return r;
 
                 if (!sd_id128_equal(id, o->entry.boot_id))
-                        return -ENOENT;
+                        return -ESTALE;
         }
 
         *ret = le64toh(o->entry.monotonic);
         return 0;
 }
 
-int sd_journal_get_data(sd_journal *j, const char *field, const void **data, size_t *size) {
+_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;
 
-        assert(j);
-        assert(field);
-        assert(data);
-        assert(size);
+        if (!j)
+                return -EINVAL;
+        if (!field)
+                return -EINVAL;
+        if (!data)
+                return -EINVAL;
+        if (!size)
+                return -EINVAL;
 
         if (isempty(field) || strchr(field, '='))
                 return -EINVAL;
@@ -1341,7 +1357,8 @@ int sd_journal_get_data(sd_journal *j, const char *field, const void **data, siz
 
         n = journal_file_entry_n_items(o);
         for (i = 0; i < n; i++) {
-                uint64_t p, l, le_hash;
+                uint64_t p, l;
+                le64_t le_hash;
                 size_t t;
 
                 p = le64toh(o->entry.items[i].object_offset);
@@ -1400,16 +1417,20 @@ int sd_journal_get_data(sd_journal *j, const char *field, const void **data, siz
         return -ENOENT;
 }
 
-int sd_journal_enumerate_data(sd_journal *j, const void **data, size_t *size) {
+_public_ int sd_journal_enumerate_data(sd_journal *j, const void **data, size_t *size) {
         JournalFile *f;
-        uint64_t p, l, n, le_hash;
+        uint64_t p, l, n;
+        le64_t le_hash;
         int r;
         Object *o;
         size_t t;
 
-        assert(j);
-        assert(data);
-        assert(size);
+        if (!j)
+                return -EINVAL;
+        if (!data)
+                return -EINVAL;
+        if (!size)
+                return -EINVAL;
 
         f = j->current_file;
         if (!f)
@@ -1464,14 +1485,16 @@ int sd_journal_enumerate_data(sd_journal *j, const void **data, size_t *size) {
         return 1;
 }
 
-void sd_journal_restart_data(sd_journal *j) {
-        assert(j);
+_public_ void sd_journal_restart_data(sd_journal *j) {
+        if (!j)
+                return;
 
         j->current_field = 0;
 }
 
-int sd_journal_get_fd(sd_journal *j) {
-        assert(j);
+_public_ int sd_journal_get_fd(sd_journal *j) {
+        if (!j)
+                return -EINVAL;
 
         return j->inotify_fd;
 }
@@ -1554,10 +1577,11 @@ static void process_inotify_event(sd_journal *j, struct inotify_event *e) {
         log_warning("Unknown inotify event.");
 }
 
-int sd_journal_process(sd_journal *j) {
+_public_ int sd_journal_process(sd_journal *j) {
         uint8_t buffer[sizeof(struct inotify_event) + FILENAME_MAX];
 
-        assert(j);
+        if (!j)
+                return -EINVAL;
 
         for (;;) {
                 struct inotify_event *e;
@@ -1586,19 +1610,27 @@ int sd_journal_process(sd_journal *j) {
         }
 }
 
-int sd_journal_query_unique(sd_journal *j, const char *field) {
-        assert(j);
-        assert(field);
-
-        return -ENOTSUP;
-}
-
-int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *l) {
-        assert(j);
-
-        return -ENOTSUP;
-}
-
-void sd_journal_restart_unique(sd_journal *j) {
-        assert(j);
-}
+/* _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; */
+/* } */