+++ /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 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 <unistd.h>
-#include <sys/epoll.h>
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <sys/socket.h>
-
-#include "systemd/sd-messages.h"
-#include <libudev.h>
-
-#include "journald-server.h"
-#include "journald-kmsg.h"
-#include "journald-syslog.h"
-
-void server_forward_kmsg(
- Server *s,
- int priority,
- const char *identifier,
- const char *message,
- const struct ucred *ucred) {
-
- struct iovec iovec[5];
- char header_priority[DECIMAL_STR_MAX(priority) + 3],
- header_pid[sizeof("[]: ")-1 + DECIMAL_STR_MAX(pid_t) + 1];
- int n = 0;
- char *ident_buf = NULL;
-
- assert(s);
- assert(priority >= 0);
- assert(priority <= 999);
- assert(message);
-
- if (_unlikely_(LOG_PRI(priority) > s->max_level_kmsg))
- return;
-
- if (_unlikely_(s->dev_kmsg_fd < 0))
- return;
-
- /* Never allow messages with kernel facility to be written to
- * kmsg, regardless where the data comes from. */
- priority = syslog_fixup_facility(priority);
-
- /* First: priority field */
- xsprintf(header_priority, "<%i>", priority);
- IOVEC_SET_STRING(iovec[n++], header_priority);
-
- /* Second: identifier and PID */
- if (ucred) {
- if (!identifier) {
- get_process_comm(ucred->pid, &ident_buf);
- identifier = ident_buf;
- }
-
- xsprintf(header_pid, "["PID_FMT"]: ", ucred->pid);
-
- if (identifier)
- IOVEC_SET_STRING(iovec[n++], identifier);
-
- IOVEC_SET_STRING(iovec[n++], header_pid);
- } else if (identifier) {
- IOVEC_SET_STRING(iovec[n++], identifier);
- IOVEC_SET_STRING(iovec[n++], ": ");
- }
-
- /* Fourth: message */
- IOVEC_SET_STRING(iovec[n++], message);
- IOVEC_SET_STRING(iovec[n++], "\n");
-
- if (writev(s->dev_kmsg_fd, iovec, n) < 0)
- log_debug_errno(errno, "Failed to write to /dev/kmsg for logging: %m");
-
- free(ident_buf);
-}
-
-static bool is_us(const char *pid) {
- pid_t t;
-
- assert(pid);
-
- if (parse_pid(pid, &t) < 0)
- return false;
-
- return t == getpid();
-}
-
-static void dev_kmsg_record(Server *s, const char *p, size_t l) {
- struct iovec iovec[N_IOVEC_META_FIELDS + 7 + N_IOVEC_KERNEL_FIELDS + 2 + N_IOVEC_UDEV_FIELDS];
- char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL;
- int priority, r;
- unsigned n = 0, z = 0, j;
- unsigned long long usec;
- char *identifier = NULL, *pid = NULL, *e, *f, *k;
- uint64_t serial;
- size_t pl;
- char *kernel_device = NULL;
-
- assert(s);
- assert(p);
-
- if (l <= 0)
- return;
-
- e = memchr(p, ',', l);
- if (!e)
- return;
- *e = 0;
-
- r = safe_atoi(p, &priority);
- if (r < 0 || priority < 0 || priority > 999)
- return;
-
- if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN)
- return;
-
- l -= (e - p) + 1;
- p = e + 1;
- e = memchr(p, ',', l);
- if (!e)
- return;
- *e = 0;
-
- r = safe_atou64(p, &serial);
- if (r < 0)
- return;
-
- if (s->kernel_seqnum) {
- /* We already read this one? */
- if (serial < *s->kernel_seqnum)
- return;
-
- /* Did we lose any? */
- if (serial > *s->kernel_seqnum)
- server_driver_message(s, SD_MESSAGE_JOURNAL_MISSED, "Missed %"PRIu64" kernel messages",
- serial - *s->kernel_seqnum);
-
- /* Make sure we never read this one again. Note that
- * we always store the next message serial we expect
- * here, simply because this makes handling the first
- * message with serial 0 easy. */
- *s->kernel_seqnum = serial + 1;
- }
-
- l -= (e - p) + 1;
- p = e + 1;
- f = memchr(p, ';', l);
- if (!f)
- return;
- /* Kernel 3.6 has the flags field, kernel 3.5 lacks that */
- e = memchr(p, ',', l);
- if (!e || f < e)
- e = f;
- *e = 0;
-
- r = safe_atollu(p, &usec);
- if (r < 0)
- return;
-
- l -= (f - p) + 1;
- p = f + 1;
- e = memchr(p, '\n', l);
- if (!e)
- return;
- *e = 0;
-
- pl = e - p;
- l -= (e - p) + 1;
- k = e + 1;
-
- for (j = 0; l > 0 && j < N_IOVEC_KERNEL_FIELDS; j++) {
- char *m;
- /* Meta data fields attached */
-
- if (*k != ' ')
- break;
-
- k ++, l --;
-
- e = memchr(k, '\n', l);
- if (!e)
- return;
-
- *e = 0;
-
- m = cunescape_length_with_prefix(k, e - k, "_KERNEL_");
- if (!m)
- break;
-
- if (startswith(m, "_KERNEL_DEVICE="))
- kernel_device = m + 15;
-
- IOVEC_SET_STRING(iovec[n++], m);
- z++;
-
- l -= (e - k) + 1;
- k = e + 1;
- }
-
- if (kernel_device) {
- struct udev_device *ud;
-
- ud = udev_device_new_from_device_id(s->udev, kernel_device);
- if (ud) {
- const char *g;
- struct udev_list_entry *ll;
- char *b;
-
- g = udev_device_get_devnode(ud);
- if (g) {
- b = strappend("_UDEV_DEVNODE=", g);
- if (b) {
- IOVEC_SET_STRING(iovec[n++], b);
- z++;
- }
- }
-
- g = udev_device_get_sysname(ud);
- if (g) {
- b = strappend("_UDEV_SYSNAME=", g);
- if (b) {
- IOVEC_SET_STRING(iovec[n++], b);
- z++;
- }
- }
-
- j = 0;
- ll = udev_device_get_devlinks_list_entry(ud);
- udev_list_entry_foreach(ll, ll) {
-
- if (j > N_IOVEC_UDEV_FIELDS)
- break;
-
- g = udev_list_entry_get_name(ll);
- if (g) {
- b = strappend("_UDEV_DEVLINK=", g);
- if (b) {
- IOVEC_SET_STRING(iovec[n++], b);
- z++;
- }
- }
-
- j++;
- }
-
- udev_device_unref(ud);
- }
- }
-
- if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu", usec) >= 0)
- IOVEC_SET_STRING(iovec[n++], source_time);
-
- IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel");
-
- if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0)
- IOVEC_SET_STRING(iovec[n++], syslog_priority);
-
- if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0)
- IOVEC_SET_STRING(iovec[n++], syslog_facility);
-
- if ((priority & LOG_FACMASK) == LOG_KERN)
- IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel");
- else {
- pl -= syslog_parse_identifier((const char**) &p, &identifier, &pid);
-
- /* Avoid any messages we generated ourselves via
- * log_info() and friends. */
- if (pid && is_us(pid))
- goto finish;
-
- if (identifier) {
- syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier);
- if (syslog_identifier)
- IOVEC_SET_STRING(iovec[n++], syslog_identifier);
- }
-
- if (pid) {
- syslog_pid = strappend("SYSLOG_PID=", pid);
- if (syslog_pid)
- IOVEC_SET_STRING(iovec[n++], syslog_pid);
- }
- }
-
- message = cunescape_length_with_prefix(p, pl, "MESSAGE=");
- if (message)
- IOVEC_SET_STRING(iovec[n++], message);
-
- server_dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, NULL, priority, 0);
-
-finish:
- for (j = 0; j < z; j++)
- free(iovec[j].iov_base);
-
- free(message);
- free(syslog_priority);
- free(syslog_identifier);
- free(syslog_pid);
- free(syslog_facility);
- free(source_time);
- free(identifier);
- free(pid);
-}
-
-static int server_read_dev_kmsg(Server *s) {
- char buffer[8192+1]; /* the kernel-side limit per record is 8K currently */
- ssize_t l;
-
- assert(s);
- assert(s->dev_kmsg_fd >= 0);
-
- l = read(s->dev_kmsg_fd, buffer, sizeof(buffer) - 1);
- if (l == 0)
- return 0;
- if (l < 0) {
- /* Old kernels who don't allow reading from /dev/kmsg
- * return EINVAL when we try. So handle this cleanly,
- * but don' try to ever read from it again. */
- if (errno == EINVAL) {
- s->dev_kmsg_event_source = sd_event_source_unref(s->dev_kmsg_event_source);
- return 0;
- }
-
- if (errno == EAGAIN || errno == EINTR || errno == EPIPE)
- return 0;
-
- log_error_errno(errno, "Failed to read from kernel: %m");
- return -errno;
- }
-
- dev_kmsg_record(s, buffer, l);
- return 1;
-}
-
-int server_flush_dev_kmsg(Server *s) {
- int r;
-
- assert(s);
-
- if (s->dev_kmsg_fd < 0)
- return 0;
-
- if (!s->dev_kmsg_readable)
- return 0;
-
- log_debug("Flushing /dev/kmsg...");
-
- for (;;) {
- r = server_read_dev_kmsg(s);
- if (r < 0)
- return r;
-
- if (r == 0)
- break;
- }
-
- return 0;
-}
-
-static int dispatch_dev_kmsg(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
- Server *s = userdata;
-
- assert(es);
- assert(fd == s->dev_kmsg_fd);
- assert(s);
-
- if (revents & EPOLLERR)
- log_warning("/dev/kmsg buffer overrun, some messages lost.");
-
- if (!(revents & EPOLLIN))
- log_error("Got invalid event from epoll for /dev/kmsg: %"PRIx32, revents);
-
- return server_read_dev_kmsg(s);
-}
-
-int server_open_dev_kmsg(Server *s) {
- int r;
-
- assert(s);
-
- s->dev_kmsg_fd = open("/dev/kmsg", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
- if (s->dev_kmsg_fd < 0) {
- log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
- "Failed to open /dev/kmsg, ignoring: %m");
- return 0;
- }
-
- r = sd_event_add_io(s->event, &s->dev_kmsg_event_source, s->dev_kmsg_fd, EPOLLIN, dispatch_dev_kmsg, s);
- if (r < 0) {
-
- /* This will fail with EPERM on older kernels where
- * /dev/kmsg is not readable. */
- if (r == -EPERM) {
- r = 0;
- goto fail;
- }
-
- log_error_errno(r, "Failed to add /dev/kmsg fd to event loop: %m");
- goto fail;
- }
-
- r = sd_event_source_set_priority(s->dev_kmsg_event_source, SD_EVENT_PRIORITY_IMPORTANT+10);
- if (r < 0) {
- log_error_errno(r, "Failed to adjust priority of kmsg event source: %m");
- goto fail;
- }
-
- s->dev_kmsg_readable = true;
-
- return 0;
-
-fail:
- s->dev_kmsg_event_source = sd_event_source_unref(s->dev_kmsg_event_source);
- s->dev_kmsg_fd = safe_close(s->dev_kmsg_fd);
-
- return r;
-}
-
-int server_open_kernel_seqnum(Server *s) {
- _cleanup_close_ int fd;
- uint64_t *p;
-
- assert(s);
-
- /* We store the seqnum we last read in an mmaped file. That
- * way we can just use it like a variable, but it is
- * persistent and automatically flushed at reboot. */
-
- fd = open("/run/systemd/journal/kernel-seqnum", O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0644);
- if (fd < 0) {
- log_error_errno(errno, "Failed to open /run/systemd/journal/kernel-seqnum, ignoring: %m");
- return 0;
- }
-
- if (posix_fallocate(fd, 0, sizeof(uint64_t)) < 0) {
- log_error_errno(errno, "Failed to allocate sequential number file, ignoring: %m");
- return 0;
- }
-
- p = mmap(NULL, sizeof(uint64_t), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
- if (p == MAP_FAILED) {
- log_error_errno(errno, "Failed to map sequential number file, ignoring: %m");
- return 0;
- }
-
- s->kernel_seqnum = p;
-
- return 0;
-}
~ianmdlvl / elogind.git / blobdiff