--- /dev/null
+/*-*- 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 General Public License as published by
+ the Free Software Foundation; either version 2 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.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <string.h>
+#include <errno.h>
+
+#include "journal-rate-limit.h"
+#include "list.h"
+#include "util.h"
+#include "hashmap.h"
+
+#define POOLS_MAX 5
+#define BUCKETS_MAX 127
+#define GROUPS_MAX 2047
+
+static const int priority_map[] = {
+ [LOG_EMERG] = 0,
+ [LOG_ALERT] = 0,
+ [LOG_CRIT] = 0,
+ [LOG_ERR] = 1,
+ [LOG_WARNING] = 2,
+ [LOG_NOTICE] = 3,
+ [LOG_INFO] = 3,
+ [LOG_DEBUG] = 4
+};
+
+typedef struct JournalRateLimitPool JournalRateLimitPool;
+typedef struct JournalRateLimitGroup JournalRateLimitGroup;
+
+struct JournalRateLimitPool {
+ usec_t begin;
+ unsigned num;
+ unsigned suppressed;
+};
+
+struct JournalRateLimitGroup {
+ JournalRateLimit *parent;
+
+ char *id;
+ JournalRateLimitPool pools[POOLS_MAX];
+ unsigned hash;
+
+ LIST_FIELDS(JournalRateLimitGroup, bucket);
+ LIST_FIELDS(JournalRateLimitGroup, lru);
+};
+
+struct JournalRateLimit {
+ usec_t interval;
+ unsigned burst;
+
+ JournalRateLimitGroup* buckets[BUCKETS_MAX];
+ JournalRateLimitGroup *lru, *lru_tail;
+
+ unsigned n_groups;
+};
+
+JournalRateLimit *journal_rate_limit_new(usec_t interval, unsigned burst) {
+ JournalRateLimit *r;
+
+ assert(interval > 0 || burst == 0);
+
+ r = new0(JournalRateLimit, 1);
+ if (!r)
+ return NULL;
+
+ r->interval = interval;
+ r->burst = burst;
+
+ return r;
+}
+
+static void journal_rate_limit_group_free(JournalRateLimitGroup *g) {
+ assert(g);
+
+ if (g->parent) {
+ assert(g->parent->n_groups > 0);
+
+ if (g->parent->lru_tail == g)
+ g->parent->lru_tail = g->lru_prev;
+
+ LIST_REMOVE(JournalRateLimitGroup, lru, g->parent->lru, g);
+ LIST_REMOVE(JournalRateLimitGroup, bucket, g->parent->buckets[g->hash % BUCKETS_MAX], g);
+
+ g->parent->n_groups --;
+ }
+
+ free(g->id);
+ free(g);
+}
+
+void journal_rate_limit_free(JournalRateLimit *r) {
+ assert(r);
+
+ while (r->lru)
+ journal_rate_limit_group_free(r->lru);
+}
+
+static bool journal_rate_limit_group_expired(JournalRateLimitGroup *g, usec_t ts) {
+ unsigned i;
+
+ assert(g);
+
+ for (i = 0; i < POOLS_MAX; i++)
+ if (g->pools[i].begin + g->parent->interval >= ts)
+ return false;
+
+ return true;
+}
+
+static void journal_rate_limit_vacuum(JournalRateLimit *r, usec_t ts) {
+ assert(r);
+
+ /* Makes room for at least one new item, but drop all
+ * expored items too. */
+
+ while (r->n_groups >= GROUPS_MAX ||
+ (r->lru_tail && journal_rate_limit_group_expired(r->lru_tail, ts)))
+ journal_rate_limit_group_free(r->lru_tail);
+}
+
+static JournalRateLimitGroup* journal_rate_limit_group_new(JournalRateLimit *r, const char *id, usec_t ts) {
+ JournalRateLimitGroup *g;
+
+ assert(r);
+ assert(id);
+
+ g = new0(JournalRateLimitGroup, 1);
+ if (!g)
+ return NULL;
+
+ g->id = strdup(id);
+ if (!g->id)
+ goto fail;
+
+ g->hash = string_hash_func(g->id);
+
+ journal_rate_limit_vacuum(r, ts);
+
+ LIST_PREPEND(JournalRateLimitGroup, bucket, r->buckets[g->hash % BUCKETS_MAX], g);
+ LIST_PREPEND(JournalRateLimitGroup, lru, r->lru, g);
+ if (!g->lru_next)
+ r->lru_tail = g;
+ r->n_groups ++;
+
+ g->parent = r;
+ return g;
+
+fail:
+ journal_rate_limit_group_free(g);
+ return NULL;
+}
+
+static uint64_t u64log2(uint64_t n) {
+ unsigned r;
+
+ if (n <= 1)
+ return 0;
+
+ r = 0;
+ for (;;) {
+ n = n >> 1;
+ if (!n)
+ return r;
+ r++;
+ }
+}
+
+static unsigned burst_modulate(unsigned burst, uint64_t available) {
+ unsigned k;
+
+ /* Modulates the burst rate a bit with the amount of available
+ * disk space */
+
+ k = u64log2(available);
+
+ /* 1MB */
+ if (k <= 20)
+ return burst;
+
+ burst = (burst * (k-20)) / 4;
+
+ /*
+ * Example:
+ *
+ * <= 1MB = rate * 1
+ * 16MB = rate * 2
+ * 256MB = rate * 3
+ * 4GB = rate * 4
+ * 64GB = rate * 5
+ * 1TB = rate * 6
+ */
+
+ return burst;
+}
+
+int journal_rate_limit_test(JournalRateLimit *r, const char *id, int priority, uint64_t available) {
+ unsigned h;
+ JournalRateLimitGroup *g;
+ JournalRateLimitPool *p;
+ unsigned burst;
+ usec_t ts;
+
+ assert(id);
+
+ if (!r)
+ return 1;
+
+ if (r->interval == 0 || r->burst == 0)
+ return 1;
+
+ burst = burst_modulate(r->burst, available);
+
+ ts = now(CLOCK_MONOTONIC);
+
+ h = string_hash_func(id);
+ g = r->buckets[h % BUCKETS_MAX];
+
+ LIST_FOREACH(bucket, g, g)
+ if (streq(g->id, id))
+ break;
+
+ if (!g) {
+ g = journal_rate_limit_group_new(r, id, ts);
+ if (!g)
+ return -ENOMEM;
+ }
+
+ p = &g->pools[priority_map[priority]];
+
+ if (p->begin <= 0) {
+ p->suppressed = 0;
+ p->num = 1;
+ p->begin = ts;
+ return 1;
+ }
+
+ if (p->begin + r->interval < ts) {
+ unsigned s;
+
+ s = p->suppressed;
+ p->suppressed = 0;
+ p->num = 1;
+ p->begin = ts;
+
+ return 1 + s;
+ }
+
+ if (p->num <= burst) {
+ p->num++;
+ return 1;
+ }
+
+ p->suppressed++;
+ return 0;
+}
#include <stddef.h>
#include <sys/ioctl.h>
#include <linux/sockios.h>
+#include <sys/statvfs.h>
#include "hashmap.h"
#include "journal-file.h"
#include "acl-util.h"
#include "cgroup-util.h"
#include "list.h"
+#include "journal-rate-limit.h"
#define USER_JOURNALS_MAX 1024
#define STDOUT_STREAMS_MAX 4096
char *buffer;
size_t buffer_size;
+ JournalRateLimit *rate_limit;
+
JournalMetrics metrics;
uint64_t max_use;
bool compress;
LIST_FIELDS(StdoutStream, stdout_stream);
};
+static uint64_t available_space(Server *s) {
+ char ids[33];
+ sd_id128_t machine;
+ char *p;
+ const char *f;
+ struct statvfs ss;
+ uint64_t sum = 0, avail = 0, ss_avail = 0;
+ int r;
+ DIR *d;
+
+ r = sd_id128_get_machine(&machine);
+ if (r < 0)
+ return 0;
+
+ if (s->system_journal)
+ f = "/var/log/journal/";
+ else
+ f = "/run/log/journal/";
+
+ p = strappend(f, sd_id128_to_string(machine, ids));
+ if (!p)
+ return 0;
+
+ d = opendir(p);
+ free(p);
+
+ if (!d)
+ return 0;
+
+ if (fstatvfs(dirfd(d), &ss) < 0)
+ goto finish;
+
+ for (;;) {
+ struct stat st;
+ struct dirent buf, *de;
+ int k;
+
+ k = readdir_r(d, &buf, &de);
+ if (k != 0) {
+ r = -k;
+ goto finish;
+ }
+
+ if (!de)
+ break;
+
+ if (!dirent_is_file_with_suffix(de, ".journal"))
+ continue;
+
+ if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
+ continue;
+
+ sum += (uint64_t) st.st_blocks * (uint64_t) st.st_blksize;
+ }
+
+ avail = sum >= s->max_use ? 0 : s->max_use - sum;
+
+ ss_avail = ss.f_bsize * ss.f_bavail;
+
+ ss_avail = ss_avail < s->metrics.keep_free ? 0 : ss_avail - s->metrics.keep_free;
+
+ if (ss_avail < avail)
+ avail = ss_avail;
+
+finish:
+ closedir(d);
+
+ return avail;
+}
+
static void fix_perms(JournalFile *f, uid_t uid) {
acl_t acl;
acl_entry_t entry;
free(p);
}
-static void dispatch_message(Server *s, struct iovec *iovec, unsigned n, unsigned m, struct ucred *ucred, struct timeval *tv) {
+static char *shortened_cgroup_path(pid_t pid) {
+ int r;
+ char *process_path, *init_path, *path;
+
+ assert(pid > 0);
+
+ r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, pid, &process_path);
+ if (r < 0)
+ return NULL;
+
+ r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &init_path);
+ if (r < 0) {
+ free(process_path);
+ return NULL;
+ }
+
+ if (streq(init_path, "/"))
+ init_path[0] = 0;
+
+ if (startswith(process_path, init_path))
+ path = process_path + strlen(init_path);
+ else
+ path = process_path;
+
+ free(init_path);
+
+ return path;
+}
+
+static void dispatch_message_real(Server *s,
+ struct iovec *iovec, unsigned n, unsigned m,
+ struct ucred *ucred,
+ struct timeval *tv) {
+
char *pid = NULL, *uid = NULL, *gid = NULL,
*source_time = NULL, *boot_id = NULL, *machine_id = NULL,
*comm = NULL, *cmdline = NULL, *hostname = NULL,
bool vacuumed = false;
assert(s);
- assert(iovec || n == 0);
-
- if (n == 0)
- return;
-
+ assert(iovec);
+ assert(n > 0);
assert(n + 13 <= m);
if (ucred) {
if (asprintf(&audit_loginuid, "_AUDIT_LOGINUID=%lu", (unsigned long) loginuid) >= 0)
IOVEC_SET_STRING(iovec[n++], audit_loginuid);
- r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, ucred->pid, &path);
- if (r >= 0) {
+ path = shortened_cgroup_path(ucred->pid);
+ if (path) {
cgroup = strappend("_SYSTEMD_CGROUP=", path);
if (cgroup)
IOVEC_SET_STRING(iovec[n++], cgroup);
+
free(path);
}
}
free(cgroup);
}
+static void dispatch_message(Server *s,
+ struct iovec *iovec, unsigned n, unsigned m,
+ struct ucred *ucred,
+ struct timeval *tv,
+ int priority) {
+ int rl;
+ char *path, *c;
+
+ assert(s);
+ assert(iovec || n == 0);
+
+ if (n == 0)
+ return;
+
+ if (!ucred)
+ goto finish;
+
+ path = shortened_cgroup_path(ucred->pid);
+ if (!path)
+ goto finish;
+
+ /* example: /user/lennart/3/foobar
+ * /system/dbus.service/foobar
+ *
+ * So let's cut of everything past the third /, since that is
+ * wher user directories start */
+
+ c = strchr(path, '/');
+ if (c) {
+ c = strchr(c+1, '/');
+ if (c) {
+ c = strchr(c+1, '/');
+ if (c)
+ *c = 0;
+ }
+ }
+
+ rl = journal_rate_limit_test(s->rate_limit, path, priority, available_space(s));
+
+ if (rl == 0) {
+ free(path);
+ return;
+ }
+
+ if (rl > 1) {
+ int j = 0;
+ char suppress_message[LINE_MAX];
+ struct iovec suppress_iovec[15];
+
+ /* Write a suppression message if we suppressed something */
+
+ snprintf(suppress_message, sizeof(suppress_message), "MESSAGE=Suppressed %u messages from %s", rl - 1, path);
+ char_array_0(suppress_message);
+
+ IOVEC_SET_STRING(suppress_iovec[j++], "PRIORITY=5");
+ IOVEC_SET_STRING(suppress_iovec[j++], suppress_message);
+
+ dispatch_message_real(s, suppress_iovec, j, ELEMENTSOF(suppress_iovec), NULL, NULL);
+ }
+
+ free(path);
+
+finish:
+ dispatch_message_real(s, iovec, n, m, ucred, tv);
+}
+
static void process_syslog_message(Server *s, const char *buf, struct ucred *ucred, struct timeval *tv) {
char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL;
struct iovec iovec[16];
if (message)
IOVEC_SET_STRING(iovec[n++], message);
- dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv);
+ dispatch_message(s, iovec, n, ELEMENTSOF(iovec), ucred, tv, priority & LOG_PRIMASK);
free(message);
free(syslog_facility);
unsigned n = 0, m = 0, j;
const char *p;
size_t remaining;
+ int priority = LOG_INFO;
assert(s);
assert(buffer || n == 0);
if (e == p) {
/* Entry separator */
- dispatch_message(s, iovec, n, m, ucred, tv);
+ dispatch_message(s, iovec, n, m, ucred, tv, priority);
n = 0;
+ priority = LOG_INFO;
p++;
remaining--;
iovec[n].iov_base = (char*) p;
iovec[n].iov_len = e - p;
n++;
+
+ /* We need to determine the priority
+ * of this entry for the rate limiting
+ * logic */
+ if (e - p == 10 &&
+ memcmp(p, "PRIORITY=", 10) == 0 &&
+ p[10] >= '0' &&
+ p[10] <= '9')
+ priority = p[10] - '0';
}
remaining -= (e - p) + 1;
}
}
- dispatch_message(s, iovec, n, m, ucred, tv);
+ dispatch_message(s, iovec, n, m, ucred, tv, priority);
for (j = 0; j < n; j++)
if (iovec[j].iov_base < buffer ||
n++;
}
- dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL);
+ dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, priority);
if (s->tee_console) {
int console;
if (r < 0)
return r;
+ s->rate_limit = journal_rate_limit_new(10*USEC_PER_SEC, 2);
+ if (!s->rate_limit)
+ return -ENOMEM;
+
return 0;
}
if (s->stdout_fd >= 0)
close_nointr_nofail(s->stdout_fd);
+
+ if (s->rate_limit)
+ journal_rate_limit_free(s->rate_limit);
}
int main(int argc, char *argv[]) {
~ianmdlvl / elogind.git / commitdiff