src/journal/journald-server.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #pragma once
   4
   5 /***
   6   This file is part of systemd.
   7
   8   Copyright 2011 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 ***/
  23
  24 #include <inttypes.h>
  25 #include <stdbool.h>
  26 #include <sys/epoll.h>
  27 #include <sys/types.h>
  28 #include <sys/socket.h>
  29
  30 #include "sd-event.h"
  31 #include "journal-file.h"
  32 #include "hashmap.h"
  33 #include "util.h"
  34 #include "audit.h"
  35 #include "journald-rate-limit.h"
  36 #include "list.h"
  37
  38 typedef enum Storage {
  39         STORAGE_AUTO,
  40         STORAGE_VOLATILE,
  41         STORAGE_PERSISTENT,
  42         STORAGE_NONE,
  43         _STORAGE_MAX,
  44         _STORAGE_INVALID = -1
  45 } Storage;
  46
  47 typedef enum SplitMode {
  48         SPLIT_UID,
  49         SPLIT_LOGIN,
  50         SPLIT_NONE,
  51         _SPLIT_MAX,
  52         _SPLIT_INVALID = -1
  53 } SplitMode;
  54
  55 typedef struct StdoutStream StdoutStream;
  56
  57 typedef struct Server {
  58         int syslog_fd;
  59         int native_fd;
  60         int stdout_fd;
  61         int dev_kmsg_fd;
  62         int hostname_fd;
  63
  64         sd_event *event;
  65
  66         sd_event_source *syslog_event_source;
  67         sd_event_source *native_event_source;
  68         sd_event_source *stdout_event_source;
  69         sd_event_source *dev_kmsg_event_source;
  70         sd_event_source *sync_event_source;
  71         sd_event_source *sigusr1_event_source;
  72         sd_event_source *sigusr2_event_source;
  73         sd_event_source *sigterm_event_source;
  74         sd_event_source *sigint_event_source;
  75         sd_event_source *hostname_event_source;
  76
  77         JournalFile *runtime_journal;
  78         JournalFile *system_journal;
  79         Hashmap *user_journals;
  80
  81         uint64_t seqnum;
  82
  83         char *buffer;
  84         size_t buffer_size;
  85
  86         JournalRateLimit *rate_limit;
  87         usec_t sync_interval_usec;
  88         usec_t rate_limit_interval;
  89         unsigned rate_limit_burst;
  90
  91         JournalMetrics runtime_metrics;
  92         JournalMetrics system_metrics;
  93
  94         bool compress;
  95         bool seal;
  96
  97         bool forward_to_kmsg;
  98         bool forward_to_syslog;
  99         bool forward_to_console;
 100         bool forward_to_wall;
 101
 102         unsigned n_forward_syslog_missed;
 103         usec_t last_warn_forward_syslog_missed;
 104
 105         uint64_t cached_available_space;
 106         usec_t cached_available_space_timestamp;
 107
 108         uint64_t var_available_timestamp;
 109
 110         usec_t max_retention_usec;
 111         usec_t max_file_usec;
 112         usec_t oldest_file_usec;
 113
 114         LIST_HEAD(StdoutStream, stdout_streams);
 115         unsigned n_stdout_streams;
 116
 117         char *tty_path;
 118
 119         int max_level_store;
 120         int max_level_syslog;
 121         int max_level_kmsg;
 122         int max_level_console;
 123         int max_level_wall;
 124
 125         Storage storage;
 126         SplitMode split_mode;
 127
 128         MMapCache *mmap;
 129
 130         bool dev_kmsg_readable;
 131
 132         uint64_t *kernel_seqnum;
 133
 134         struct udev *udev;
 135
 136         bool sync_scheduled;
 137
 138         char machine_id_field[sizeof("_MACHINE_ID=") + 32];
 139         char boot_id_field[sizeof("_BOOT_ID=") + 32];
 140         char *hostname_field;
 141
 142         /* Cached cgroup root, so that we don't have to query that all the time */
 143         char *cgroup_root;
 144 } Server;
 145
 146 #define N_IOVEC_META_FIELDS 20
 147 #define N_IOVEC_KERNEL_FIELDS 64
 148 #define N_IOVEC_UDEV_FIELDS 32
 149 #define N_IOVEC_OBJECT_FIELDS 11
 150
 151 void server_dispatch_message(Server *s, struct iovec *iovec, unsigned n, unsigned m, struct ucred *ucred, struct timeval *tv, const char *label, size_t label_len, const char *unit_id, int priority, pid_t object_pid);
 152 void server_driver_message(Server *s, sd_id128_t message_id, const char *format, ...) _printf_(3,4);
 153
 154 /* gperf lookup function */
 155 const struct ConfigPerfItem* journald_gperf_lookup(const char *key, unsigned length);
 156
 157 int config_parse_storage(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 158
 159 const char *storage_to_string(Storage s) _const_;
 160 Storage storage_from_string(const char *s) _pure_;
 161
 162 int config_parse_split_mode(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 163
 164 const char *split_mode_to_string(SplitMode s) _const_;
 165 SplitMode split_mode_from_string(const char *s) _pure_;
 166
 167 void server_fix_perms(Server *s, JournalFile *f, uid_t uid);
 168 bool shall_try_append_again(JournalFile *f, int r);
 169 int server_init(Server *s);
 170 void server_done(Server *s);
 171 void server_sync(Server *s);
 172 void server_vacuum(Server *s);
 173 void server_rotate(Server *s);
 174 int server_schedule_sync(Server *s, int priority);
 175 int server_flush_to_var(Server *s);
 176 void server_maybe_append_tags(Server *s);
 177 int process_datagram(sd_event_source *es, int fd, uint32_t revents, void *userdata);