mirror of
https://github.com/systemd/systemd.git
synced 2024-10-30 23:21:22 +03:00
da927ba997
It corrrectly handles both positive and negative errno values.
480 lines
14 KiB
C
480 lines
14 KiB
C
/*-*- 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 "socket-util.h"
|
|
#include "selinux-util.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;
|
|
|
|
char buffer[LINE_MAX+1];
|
|
size_t length;
|
|
|
|
sd_event_source *event_source;
|
|
|
|
LIST_FIELDS(StdoutStream, stdout_stream);
|
|
};
|
|
|
|
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;
|
|
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("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_free(s);
|
|
return 0;
|
|
}
|
|
|
|
void stdout_stream_free(StdoutStream *s) {
|
|
assert(s);
|
|
|
|
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);
|
|
}
|
|
|
|
static int stdout_stream_new(sd_event_source *es, int listen_fd, uint32_t revents, void *userdata) {
|
|
Server *s = userdata;
|
|
StdoutStream *stream;
|
|
int fd, 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("Failed to accept stdout connection: %m");
|
|
return -errno;
|
|
}
|
|
|
|
if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
|
|
log_warning("Too many stdout streams, refusing connection.");
|
|
safe_close(fd);
|
|
return 0;
|
|
}
|
|
|
|
stream = new0(StdoutStream, 1);
|
|
if (!stream) {
|
|
safe_close(fd);
|
|
return log_oom();
|
|
}
|
|
|
|
stream->fd = fd;
|
|
|
|
r = getpeercred(fd, &stream->ucred);
|
|
if (r < 0) {
|
|
log_error("Failed to determine peer credentials: %m");
|
|
goto fail;
|
|
}
|
|
|
|
#ifdef HAVE_SELINUX
|
|
if (mac_selinux_use()) {
|
|
if (getpeercon(fd, &stream->security_context) < 0 && errno != ENOPROTOOPT)
|
|
log_error("Failed to determine peer security context: %m");
|
|
}
|
|
#endif
|
|
|
|
if (shutdown(fd, SHUT_WR) < 0) {
|
|
log_error("Failed to shutdown writing side of socket: %m");
|
|
goto fail;
|
|
}
|
|
|
|
r = sd_event_add_io(s->event, &stream->event_source, fd, EPOLLIN, stdout_stream_process, stream);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to add stream to event loop: %m");
|
|
goto fail;
|
|
}
|
|
|
|
r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to adjust stdout event source priority: %m");
|
|
goto fail;
|
|
}
|
|
|
|
stream->server = s;
|
|
LIST_PREPEND(stdout_stream, s->stdout_streams, stream);
|
|
s->n_stdout_streams ++;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
stdout_stream_free(stream);
|
|
return 0;
|
|
}
|
|
|
|
int server_open_stdout_socket(Server *s) {
|
|
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) {
|
|
log_error("socket() failed: %m");
|
|
return -errno;
|
|
}
|
|
|
|
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) {
|
|
log_error("bind(%s) failed: %m", sa.un.sun_path);
|
|
return -errno;
|
|
}
|
|
|
|
chmod(sa.un.sun_path, 0666);
|
|
|
|
if (listen(s->stdout_fd, SOMAXCONN) < 0) {
|
|
log_error("listen(%s) failed: %m", sa.un.sun_path);
|
|
return -errno;
|
|
}
|
|
} 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) {
|
|
log_error_errno(r, "Failed to add stdout server fd to event source: %m");
|
|
return r;
|
|
}
|
|
|
|
r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+10);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|