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Systemd/src/journal/journald-stream.c

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/*-*- 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 <fcntl.h>
#include <unistd.h>
#include <stddef.h>
#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
#endif
#include "sd-event.h"
#include "sd-daemon.h"
#include "socket-util.h"
#include "selinux-util.h"
#include "mkdir.h"
#include "fileio.h"
#include "journald-server.h"
#include "journald-stream.h"
#include "journald-syslog.h"
#include "journald-kmsg.h"
#include "journald-console.h"
#include "journald-wall.h"
#define STDOUT_STREAMS_MAX 4096
typedef enum StdoutStreamState {
STDOUT_STREAM_IDENTIFIER,
STDOUT_STREAM_UNIT_ID,
STDOUT_STREAM_PRIORITY,
STDOUT_STREAM_LEVEL_PREFIX,
STDOUT_STREAM_FORWARD_TO_SYSLOG,
STDOUT_STREAM_FORWARD_TO_KMSG,
STDOUT_STREAM_FORWARD_TO_CONSOLE,
STDOUT_STREAM_RUNNING
} StdoutStreamState;
struct StdoutStream {
Server *server;
StdoutStreamState state;
int fd;
struct ucred ucred;
#ifdef HAVE_SELINUX
security_context_t security_context;
#endif
char *identifier;
char *unit_id;
int priority;
bool level_prefix:1;
bool forward_to_syslog:1;
bool forward_to_kmsg:1;
bool forward_to_console:1;
bool fdstore:1;
char buffer[LINE_MAX+1];
size_t length;
sd_event_source *event_source;
char *state_file;
LIST_FIELDS(StdoutStream, stdout_stream);
};
void stdout_stream_free(StdoutStream *s) {
if (!s)
return;
if (s->server) {
assert(s->server->n_stdout_streams > 0);
s->server->n_stdout_streams --;
LIST_REMOVE(stdout_stream, s->server->stdout_streams, s);
}
if (s->event_source) {
sd_event_source_set_enabled(s->event_source, SD_EVENT_OFF);
s->event_source = sd_event_source_unref(s->event_source);
}
safe_close(s->fd);
#ifdef HAVE_SELINUX
if (s->security_context)
freecon(s->security_context);
#endif
free(s->identifier);
free(s->unit_id);
free(s->state_file);
free(s);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(StdoutStream*, stdout_stream_free);
static void stdout_stream_destroy(StdoutStream *s) {
if (!s)
return;
if (s->state_file)
unlink(s->state_file);
stdout_stream_free(s);
}
static int stdout_stream_save(StdoutStream *s) {
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(s);
if (s->state != STDOUT_STREAM_RUNNING)
return 0;
if (!s->state_file) {
struct stat st;
r = fstat(s->fd, &st);
if (r < 0)
return log_warning_errno(errno, "Failed to stat connected stream: %m");
/* We use device and inode numbers as identifier for the stream */
if (asprintf(&s->state_file, "/run/systemd/journal/streams/%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino) < 0)
return log_oom();
}
mkdir_p("/run/systemd/journal/streams", 0755);
r = fopen_temporary(s->state_file, &f, &temp_path);
if (r < 0)
goto finish;
fprintf(f,
"# This is private data. Do not parse\n"
"PRIORITY=%i\n"
"LEVEL_PREFIX=%i\n"
"FORWARD_TO_SYSLOG=%i\n"
"FORWARD_TO_KMSG=%i\n"
"FORWARD_TO_CONSOLE=%i\n",
s->priority,
s->level_prefix,
s->forward_to_syslog,
s->forward_to_kmsg,
s->forward_to_console);
if (!isempty(s->identifier)) {
_cleanup_free_ char *escaped;
escaped = cescape(s->identifier);
if (!escaped) {
r = -ENOMEM;
goto finish;
}
fprintf(f, "IDENTIFIER=%s\n", escaped);
}
if (!isempty(s->unit_id)) {
_cleanup_free_ char *escaped;
escaped = cescape(s->unit_id);
if (!escaped) {
r = -ENOMEM;
goto finish;
}
fprintf(f, "UNIT=%s\n", escaped);
}
r = fflush_and_check(f);
if (r < 0)
goto finish;
if (rename(temp_path, s->state_file) < 0) {
r = -errno;
goto finish;
}
free(temp_path);
temp_path = NULL;
/* Store the connection fd in PID 1, so that we get it passed
* in again on next start */
if (!s->fdstore) {
sd_pid_notify_with_fds(0, false, "FDSTORE=1", &s->fd, 1);
s->fdstore = true;
}
finish:
if (temp_path)
unlink(temp_path);
if (r < 0)
log_error_errno(r, "Failed to save stream data %s: %m", s->state_file);
return r;
}
static int stdout_stream_log(StdoutStream *s, const char *p) {
struct iovec iovec[N_IOVEC_META_FIELDS + 5];
int priority;
char syslog_priority[] = "PRIORITY=\0";
char syslog_facility[sizeof("SYSLOG_FACILITY=") + DECIMAL_STR_MAX(priority)];
_cleanup_free_ char *message = NULL, *syslog_identifier = NULL;
unsigned n = 0;
char *label = NULL;
size_t label_len = 0;
assert(s);
assert(p);
if (isempty(p))
return 0;
priority = s->priority;
if (s->level_prefix)
syslog_parse_priority(&p, &priority, false);
if (s->forward_to_syslog || s->server->forward_to_syslog)
server_forward_syslog(s->server, syslog_fixup_facility(priority), s->identifier, p, &s->ucred, NULL);
if (s->forward_to_kmsg || s->server->forward_to_kmsg)
server_forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
if (s->forward_to_console || s->server->forward_to_console)
server_forward_console(s->server, priority, s->identifier, p, &s->ucred);
if (s->server->forward_to_wall)
server_forward_wall(s->server, priority, s->identifier, p, &s->ucred);
IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout");
syslog_priority[strlen("PRIORITY=")] = '0' + LOG_PRI(priority);
IOVEC_SET_STRING(iovec[n++], syslog_priority);
if (priority & LOG_FACMASK) {
snprintf(syslog_facility, sizeof(syslog_facility), "SYSLOG_FACILITY=%i", LOG_FAC(priority));
IOVEC_SET_STRING(iovec[n++], syslog_facility);
}
if (s->identifier) {
syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
if (syslog_identifier)
IOVEC_SET_STRING(iovec[n++], syslog_identifier);
}
message = strappend("MESSAGE=", p);
if (message)
IOVEC_SET_STRING(iovec[n++], message);
#ifdef HAVE_SELINUX
if (s->security_context) {
label = (char*) s->security_context;
label_len = strlen((char*) s->security_context);
}
#endif
server_dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, label, label_len, s->unit_id, priority, 0);
return 0;
}
static int stdout_stream_line(StdoutStream *s, char *p) {
int r;
assert(s);
assert(p);
p = strstrip(p);
switch (s->state) {
case STDOUT_STREAM_IDENTIFIER:
if (isempty(p))
s->identifier = NULL;
else {
s->identifier = strdup(p);
if (!s->identifier)
return log_oom();
}
s->state = STDOUT_STREAM_UNIT_ID;
return 0;
case STDOUT_STREAM_UNIT_ID:
if (s->ucred.uid == 0) {
if (isempty(p))
s->unit_id = NULL;
else {
s->unit_id = strdup(p);
if (!s->unit_id)
return log_oom();
}
}
s->state = STDOUT_STREAM_PRIORITY;
return 0;
case STDOUT_STREAM_PRIORITY:
r = safe_atoi(p, &s->priority);
if (r < 0 || s->priority < 0 || s->priority > 999) {
log_warning("Failed to parse log priority line.");
return -EINVAL;
}
s->state = STDOUT_STREAM_LEVEL_PREFIX;
return 0;
case STDOUT_STREAM_LEVEL_PREFIX:
r = parse_boolean(p);
if (r < 0) {
log_warning("Failed to parse level prefix line.");
return -EINVAL;
}
s->level_prefix = !!r;
s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
return 0;
case STDOUT_STREAM_FORWARD_TO_SYSLOG:
r = parse_boolean(p);
if (r < 0) {
log_warning("Failed to parse forward to syslog line.");
return -EINVAL;
}
s->forward_to_syslog = !!r;
s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
return 0;
case STDOUT_STREAM_FORWARD_TO_KMSG:
r = parse_boolean(p);
if (r < 0) {
log_warning("Failed to parse copy to kmsg line.");
return -EINVAL;
}
s->forward_to_kmsg = !!r;
s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
return 0;
case STDOUT_STREAM_FORWARD_TO_CONSOLE:
r = parse_boolean(p);
if (r < 0) {
log_warning("Failed to parse copy to console line.");
return -EINVAL;
}
s->forward_to_console = !!r;
s->state = STDOUT_STREAM_RUNNING;
/* Try to save the stream, so that journald can be restarted and we can recover */
(void) stdout_stream_save(s);
return 0;
case STDOUT_STREAM_RUNNING:
return stdout_stream_log(s, p);
}
assert_not_reached("Unknown stream state");
}
static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
char *p;
size_t remaining;
int r;
assert(s);
p = s->buffer;
remaining = s->length;
for (;;) {
char *end;
size_t skip;
end = memchr(p, '\n', remaining);
if (end)
skip = end - p + 1;
else if (remaining >= sizeof(s->buffer) - 1) {
end = p + sizeof(s->buffer) - 1;
skip = remaining;
} else
break;
*end = 0;
r = stdout_stream_line(s, p);
if (r < 0)
return r;
remaining -= skip;
p += skip;
}
if (force_flush && remaining > 0) {
p[remaining] = 0;
r = stdout_stream_line(s, p);
if (r < 0)
return r;
p += remaining;
remaining = 0;
}
if (p > s->buffer) {
memmove(s->buffer, p, remaining);
s->length = remaining;
}
return 0;
}
static int stdout_stream_process(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
StdoutStream *s = userdata;
ssize_t l;
int r;
assert(s);
if ((revents|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
log_error("Got invalid event from epoll for stdout stream: %"PRIx32, revents);
goto terminate;
}
l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
if (l < 0) {
if (errno == EAGAIN)
return 0;
log_warning_errno(errno, "Failed to read from stream: %m");
goto terminate;
}
if (l == 0) {
stdout_stream_scan(s, true);
goto terminate;
}
s->length += l;
r = stdout_stream_scan(s, false);
if (r < 0)
goto terminate;
return 1;
terminate:
stdout_stream_destroy(s);
return 0;
}
static int stdout_stream_install(Server *s, int fd, StdoutStream **ret) {
_cleanup_(stdout_stream_freep) StdoutStream *stream = NULL;
int r;
assert(s);
assert(fd >= 0);
stream = new0(StdoutStream, 1);
if (!stream)
return log_oom();
stream->fd = -1;
stream->priority = LOG_INFO;
r = getpeercred(fd, &stream->ucred);
if (r < 0)
return log_error_errno(r, "Failed to determine peer credentials: %m");
#ifdef HAVE_SELINUX
if (mac_selinux_use()) {
if (getpeercon(fd, &stream->security_context) < 0 && errno != ENOPROTOOPT)
log_error_errno(errno, "Failed to determine peer security context: %m");
}
#endif
(void) shutdown(fd, SHUT_WR);
r = sd_event_add_io(s->event, &stream->event_source, fd, EPOLLIN, stdout_stream_process, stream);
if (r < 0)
return log_error_errno(r, "Failed to add stream to event loop: %m");
r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5);
if (r < 0)
return log_error_errno(r, "Failed to adjust stdout event source priority: %m");
stream->fd = fd;
stream->server = s;
LIST_PREPEND(stdout_stream, s->stdout_streams, stream);
s->n_stdout_streams ++;
if (ret)
*ret = stream;
stream = NULL;
return 0;
}
static int stdout_stream_new(sd_event_source *es, int listen_fd, uint32_t revents, void *userdata) {
_cleanup_close_ int fd = -1;
Server *s = userdata;
int r;
assert(s);
if (revents != EPOLLIN) {
log_error("Got invalid event from epoll for stdout server fd: %"PRIx32, revents);
return -EIO;
}
fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
if (fd < 0) {
if (errno == EAGAIN)
return 0;
log_error_errno(errno, "Failed to accept stdout connection: %m");
return -errno;
}
if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
log_warning("Too many stdout streams, refusing connection.");
return 0;
}
r = stdout_stream_install(s, fd, NULL);
if (r < 0)
return r;
fd = -1;
return 0;
}
static int stdout_stream_load(StdoutStream *stream, const char *fname) {
_cleanup_free_ char
*priority = NULL,
*level_prefix = NULL,
*forward_to_syslog = NULL,
*forward_to_kmsg = NULL,
*forward_to_console = NULL;
int r;
assert(stream);
assert(fname);
if (!stream->state_file) {
stream->state_file = strappend("/run/systemd/journal/streams/", fname);
if (!stream->state_file)
return log_oom();
}
r = parse_env_file(stream->state_file, NEWLINE,
"PRIORITY", &priority,
"LEVEL_PREFIX", &level_prefix,
"FORWARD_TO_SYSLOG", &forward_to_syslog,
"FORWARD_TO_KMSG", &forward_to_kmsg,
"FORWARD_TO_CONSOLE", &forward_to_console,
"IDENTIFIER", &stream->identifier,
"UNIT", &stream->unit_id,
NULL);
if (r < 0)
return log_error_errno(r, "Failed to read: %s", stream->state_file);
if (priority) {
int p;
p = log_level_from_string(priority);
if (p >= 0)
stream->priority = p;
}
if (level_prefix) {
r = parse_boolean(level_prefix);
if (r >= 0)
stream->level_prefix = r;
}
if (forward_to_syslog) {
r = parse_boolean(forward_to_syslog);
if (r >= 0)
stream->forward_to_syslog = r;
}
if (forward_to_kmsg) {
r = parse_boolean(forward_to_kmsg);
if (r >= 0)
stream->forward_to_kmsg = r;
}
if (forward_to_console) {
r = parse_boolean(forward_to_console);
if (r >= 0)
stream->forward_to_console = r;
}
return 0;
}
static int stdout_stream_restore(Server *s, const char *fname, int fd) {
StdoutStream *stream;
int r;
assert(s);
assert(fname);
assert(fd >= 0);
if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
log_warning("Too many stdout streams, refusing restoring of stream.");
return -ENOBUFS;
}
r = stdout_stream_install(s, fd, &stream);
if (r < 0)
return r;
stream->state = STDOUT_STREAM_RUNNING;
stream->fdstore = true;
/* Ignore all parsing errors */
(void) stdout_stream_load(stream, fname);
return 0;
}
static int server_restore_streams(Server *s, FDSet *fds) {
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
int r;
d = opendir("/run/systemd/journal/streams");
if (!d) {
if (errno == ENOENT)
return 0;
return log_warning_errno(errno, "Failed to enumerate /run/systemd/journal/streams: %m");
}
FOREACH_DIRENT(de, d, goto fail) {
unsigned long st_dev, st_ino;
bool found = false;
Iterator i;
int fd;
if (sscanf(de->d_name, "%lu:%lu", &st_dev, &st_ino) != 2)
continue;
FDSET_FOREACH(fd, fds, i) {
struct stat st;
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Failed to stat %s: %m", de->d_name);
if (S_ISSOCK(st.st_mode) && st.st_dev == st_dev && st.st_ino == st_ino) {
found = true;
break;
}
}
if (!found) {
/* No file descriptor? Then let's delete the state file */
log_debug("Cannot restore stream file %s", de->d_name);
unlinkat(dirfd(d), de->d_name, 0);
continue;
}
fdset_remove(fds, fd);
r = stdout_stream_restore(s, de->d_name, fd);
if (r < 0)
safe_close(fd);
}
return 0;
fail:
return log_error_errno(errno, "Failed to read streams directory: %m");
}
int server_open_stdout_socket(Server *s, FDSet *fds) {
int r;
assert(s);
if (s->stdout_fd < 0) {
union sockaddr_union sa = {
.un.sun_family = AF_UNIX,
.un.sun_path = "/run/systemd/journal/stdout",
};
s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (s->stdout_fd < 0)
return log_error_errno(errno, "socket() failed: %m");
unlink(sa.un.sun_path);
r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
if (r < 0)
return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
chmod(sa.un.sun_path, 0666);
if (listen(s->stdout_fd, SOMAXCONN) < 0)
return log_error_errno(errno, "listen(%s) failed: %m", sa.un.sun_path);
} else
fd_nonblock(s->stdout_fd, 1);
r = sd_event_add_io(s->event, &s->stdout_event_source, s->stdout_fd, EPOLLIN, stdout_stream_new, s);
if (r < 0)
return log_error_errno(r, "Failed to add stdout server fd to event source: %m");
r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+10);
if (r < 0)
return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
/* Try to restore streams, but don't bother if this fails */
(void) server_restore_streams(s, fds);
return 0;
}
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