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Systemd/src/journal/journald-stream.c

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/***
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 <stddef.h>
#include <unistd.h>
#if HAVE_SELINUX
#include <selinux/selinux.h>
#endif
#include "sd-daemon.h"
#include "sd-event.h"
#include "alloc-util.h"
#include "dirent-util.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio.h"
#include "io-util.h"
#include "journald-console.h"
#include "journald-context.h"
#include "journald-kmsg.h"
#include "journald-server.h"
#include "journald-stream.h"
#include "journald-syslog.h"
#include "journald-wall.h"
#include "mkdir.h"
#include "parse-util.h"
#include "process-util.h"
#include "selinux-util.h"
#include "socket-util.h"
#include "stdio-util.h"
#include "string-util.h"
#include "syslog-util.h"
#include "unit-name.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;
/* The different types of log record terminators: a real \n was read, a NUL character was read, the maximum line length
* was reached, or the end of the stream was reached */
typedef enum LineBreak {
LINE_BREAK_NEWLINE,
LINE_BREAK_NUL,
LINE_BREAK_LINE_MAX,
LINE_BREAK_EOF,
} LineBreak;
struct StdoutStream {
Server *server;
StdoutStreamState state;
int fd;
struct ucred ucred;
char *label;
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;
bool in_notify_queue:1;
char *buffer;
size_t length;
size_t allocated;
sd_event_source *event_source;
char *state_file;
ClientContext *context;
LIST_FIELDS(StdoutStream, stdout_stream);
LIST_FIELDS(StdoutStream, stdout_stream_notify_queue);
char id_field[sizeof("_STREAM_ID=")-1 + SD_ID128_STRING_MAX];
};
void stdout_stream_free(StdoutStream *s) {
if (!s)
return;
if (s->server) {
if (s->context)
client_context_release(s->server, s->context);
assert(s->server->n_stdout_streams > 0);
s->server->n_stdout_streams--;
LIST_REMOVE(stdout_stream, s->server->stdout_streams, s);
if (s->in_notify_queue)
LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, 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);
free(s->label);
free(s->identifier);
free(s->unit_id);
free(s->state_file);
free(s->buffer);
free(s);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(StdoutStream*, stdout_stream_free);
static void stdout_stream_destroy(StdoutStream *s) {
if (!s)
return;
if (s->state_file)
(void) 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 fail;
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"
"STREAM_ID=%s\n",
s->priority,
s->level_prefix,
s->forward_to_syslog,
s->forward_to_kmsg,
s->forward_to_console,
s->id_field + strlen("_STREAM_ID="));
if (!isempty(s->identifier)) {
_cleanup_free_ char *escaped;
escaped = cescape(s->identifier);
if (!escaped) {
r = -ENOMEM;
goto fail;
}
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 fail;
}
fprintf(f, "UNIT=%s\n", escaped);
}
r = fflush_and_check(f);
if (r < 0)
goto fail;
if (rename(temp_path, s->state_file) < 0) {
r = -errno;
goto fail;
}
if (!s->fdstore && !s->in_notify_queue) {
LIST_PREPEND(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
s->in_notify_queue = true;
if (s->server->notify_event_source) {
r = sd_event_source_set_enabled(s->server->notify_event_source, SD_EVENT_ON);
if (r < 0)
log_warning_errno(r, "Failed to enable notify event source: %m");
}
}
return 0;
fail:
(void) unlink(s->state_file);
if (temp_path)
(void) unlink(temp_path);
return log_error_errno(r, "Failed to save stream data %s: %m", s->state_file);
}
static int stdout_stream_log(StdoutStream *s, const char *p, LineBreak line_break) {
struct iovec iovec[N_IOVEC_META_FIELDS + 7];
int priority;
char syslog_priority[] = "PRIORITY=\0";
char syslog_facility[sizeof("SYSLOG_FACILITY=")-1 + DECIMAL_STR_MAX(int) + 1];
_cleanup_free_ char *message = NULL, *syslog_identifier = NULL;
unsigned n = 0;
int r;
assert(s);
assert(p);
priority = s->priority;
if (s->level_prefix)
syslog_parse_priority(&p, &priority, false);
if (isempty(p))
return 0;
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[n++] = IOVEC_MAKE_STRING("_TRANSPORT=stdout");
iovec[n++] = IOVEC_MAKE_STRING(s->id_field);
syslog_priority[strlen("PRIORITY=")] = '0' + LOG_PRI(priority);
iovec[n++] = IOVEC_MAKE_STRING(syslog_priority);
if (priority & LOG_FACMASK) {
xsprintf(syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority));
iovec[n++] = IOVEC_MAKE_STRING(syslog_facility);
}
if (s->identifier) {
syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
if (syslog_identifier)
iovec[n++] = IOVEC_MAKE_STRING(syslog_identifier);
}
if (line_break != LINE_BREAK_NEWLINE) {
const char *c;
/* If this log message was generated due to an uncommon line break then mention this in the log
* entry */
c = line_break == LINE_BREAK_NUL ? "_LINE_BREAK=nul" :
line_break == LINE_BREAK_LINE_MAX ? "_LINE_BREAK=line-max" :
"_LINE_BREAK=eof";
iovec[n++] = IOVEC_MAKE_STRING(c);
}
message = strappend("MESSAGE=", p);
if (message)
iovec[n++] = IOVEC_MAKE_STRING(message);
if (s->context)
(void) client_context_maybe_refresh(s->server, s->context, NULL, NULL, 0, NULL, USEC_INFINITY);
else if (pid_is_valid(s->ucred.pid)) {
r = client_context_acquire(s->server, s->ucred.pid, &s->ucred, s->label, strlen_ptr(s->label), s->unit_id, &s->context);
if (r < 0)
log_warning_errno(r, "Failed to acquire client context, ignoring: %m");
}
server_dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), s->context, NULL, priority, 0);
return 0;
}
static int stdout_stream_line(StdoutStream *s, char *p, LineBreak line_break) {
int r;
char *orig;
assert(s);
assert(p);
orig = p;
p = strstrip(p);
/* line breaks by NUL, line max length or EOF are not permissible during the negotiation part of the protocol */
if (line_break != LINE_BREAK_NEWLINE && s->state != STDOUT_STREAM_RUNNING) {
log_warning("Control protocol line not properly terminated.");
return -EINVAL;
}
switch (s->state) {
case STDOUT_STREAM_IDENTIFIER:
if (!isempty(p)) {
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 &&
unit_name_is_valid(p, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
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, orig, line_break);
}
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;
/* XXX: This function does nothing if (s->length == 0) */
for (;;) {
LineBreak line_break;
size_t skip;
char *end1, *end2;
end1 = memchr(p, '\n', remaining);
end2 = memchr(p, 0, end1 ? (size_t) (end1 - p) : remaining);
if (end2) {
/* We found a NUL terminator */
skip = end2 - p + 1;
line_break = LINE_BREAK_NUL;
} else if (end1) {
/* We found a \n terminator */
*end1 = 0;
skip = end1 - p + 1;
line_break = LINE_BREAK_NEWLINE;
} else if (remaining >= s->server->line_max) {
/* Force a line break after the maximum line length */
*(p + s->server->line_max) = 0;
skip = remaining;
line_break = LINE_BREAK_LINE_MAX;
} else
break;
r = stdout_stream_line(s, p, line_break);
if (r < 0)
return r;
remaining -= skip;
p += skip;
}
if (force_flush && remaining > 0) {
p[remaining] = 0;
r = stdout_stream_line(s, p, LINE_BREAK_EOF);
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;
size_t limit;
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;
}
/* If the buffer is full already (discounting the extra NUL we need), add room for another 1K */
if (s->length + 1 >= s->allocated) {
if (!GREEDY_REALLOC(s->buffer, s->allocated, s->length + 1 + 1024)) {
log_oom();
goto terminate;
}
}
/* Try to make use of the allocated buffer in full, but never read more than the configured line size. Also,
* always leave room for a terminating NUL we might need to add. */
limit = MIN(s->allocated - 1, s->server->line_max);
l = read(s->fd, s->buffer + s->length, limit - 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;
sd_id128_t id;
int r;
assert(s);
assert(fd >= 0);
r = sd_id128_randomize(&id);
if (r < 0)
return log_error_errno(r, "Failed to generate stream ID: %m");
stream = new0(StdoutStream, 1);
if (!stream)
return log_oom();
stream->fd = -1;
stream->priority = LOG_INFO;
xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id));
r = getpeercred(fd, &stream->ucred);
if (r < 0)
return log_error_errno(r, "Failed to determine peer credentials: %m");
if (mac_selinux_use()) {
r = getpeersec(fd, &stream->label);
if (r < 0 && r != -EOPNOTSUPP)
(void) log_warning_errno(r, "Failed to determine peer security context: %m");
}
(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;
return log_error_errno(errno, "Failed to accept stdout connection: %m");
}
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,
*stream_id = 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,
"STREAM_ID", &stream_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;
}
if (stream_id) {
sd_id128_t id;
r = sd_id128_from_string(stream_id, &id);
if (r >= 0)
xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id));
}
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;
}
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) {
static const union sockaddr_union sa = {
.un.sun_family = AF_UNIX,
.un.sun_path = "/run/systemd/journal/stdout",
};
int r;
assert(s);
if (s->stdout_fd < 0) {
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");
(void) unlink(sa.un.sun_path);
r = bind(s->stdout_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
if (r < 0)
return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
(void) 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+5);
if (r < 0)
return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
return 0;
}
void stdout_stream_send_notify(StdoutStream *s) {
struct iovec iovec = {
.iov_base = (char*) "FDSTORE=1",
.iov_len = strlen("FDSTORE=1"),
};
struct msghdr msghdr = {
.msg_iov = &iovec,
.msg_iovlen = 1,
};
struct cmsghdr *cmsg;
ssize_t l;
assert(s);
assert(!s->fdstore);
assert(s->in_notify_queue);
assert(s->server);
assert(s->server->notify_fd >= 0);
/* Store the connection fd in PID 1, so that we get it passed
* in again on next start */
msghdr.msg_controllen = CMSG_SPACE(sizeof(int));
msghdr.msg_control = alloca0(msghdr.msg_controllen);
cmsg = CMSG_FIRSTHDR(&msghdr);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
memcpy(CMSG_DATA(cmsg), &s->fd, sizeof(int));
l = sendmsg(s->server->notify_fd, &msghdr, MSG_DONTWAIT|MSG_NOSIGNAL);
if (l < 0) {
if (errno == EAGAIN)
return;
log_error_errno(errno, "Failed to send stream file descriptor to service manager: %m");
} else {
log_debug("Successfully sent stream file descriptor to service manager.");
s->fdstore = 1;
}
LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
s->in_notify_queue = false;
}
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