470 lines
14 KiB
C
470 lines
14 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <fcntl.h>
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#include <unistd.h>
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#include <stddef.h>
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#ifdef HAVE_SELINUX
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#include <selinux/selinux.h>
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#endif
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#include "sd-event.h"
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#include "socket-util.h"
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#include "selinux-util.h"
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#include "journald-server.h"
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#include "journald-stream.h"
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#include "journald-syslog.h"
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#include "journald-kmsg.h"
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#include "journald-console.h"
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#include "journald-wall.h"
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#define STDOUT_STREAMS_MAX 4096
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typedef enum StdoutStreamState {
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STDOUT_STREAM_IDENTIFIER,
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STDOUT_STREAM_UNIT_ID,
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STDOUT_STREAM_PRIORITY,
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STDOUT_STREAM_LEVEL_PREFIX,
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STDOUT_STREAM_FORWARD_TO_SYSLOG,
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STDOUT_STREAM_FORWARD_TO_KMSG,
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STDOUT_STREAM_FORWARD_TO_CONSOLE,
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STDOUT_STREAM_RUNNING
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} StdoutStreamState;
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struct StdoutStream {
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Server *server;
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StdoutStreamState state;
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int fd;
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struct ucred ucred;
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#ifdef HAVE_SELINUX
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security_context_t security_context;
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#endif
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char *identifier;
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char *unit_id;
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int priority;
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bool level_prefix:1;
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bool forward_to_syslog:1;
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bool forward_to_kmsg:1;
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bool forward_to_console:1;
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char buffer[LINE_MAX+1];
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size_t length;
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sd_event_source *event_source;
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LIST_FIELDS(StdoutStream, stdout_stream);
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};
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static int stdout_stream_log(StdoutStream *s, const char *p) {
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struct iovec iovec[N_IOVEC_META_FIELDS + 5];
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int priority;
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char syslog_priority[] = "PRIORITY=\0";
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char syslog_facility[sizeof("SYSLOG_FACILITY=") + DECIMAL_STR_MAX(priority)];
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_cleanup_free_ char *message = NULL, *syslog_identifier = NULL;
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unsigned n = 0;
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char *label = NULL;
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size_t label_len = 0;
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assert(s);
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assert(p);
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if (isempty(p))
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return 0;
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priority = s->priority;
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if (s->level_prefix)
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syslog_parse_priority(&p, &priority, false);
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if (s->forward_to_syslog || s->server->forward_to_syslog)
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server_forward_syslog(s->server, syslog_fixup_facility(priority), s->identifier, p, &s->ucred, NULL);
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if (s->forward_to_kmsg || s->server->forward_to_kmsg)
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server_forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
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if (s->forward_to_console || s->server->forward_to_console)
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server_forward_console(s->server, priority, s->identifier, p, &s->ucred);
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if (s->server->forward_to_wall)
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server_forward_wall(s->server, priority, s->identifier, p, &s->ucred);
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IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout");
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syslog_priority[strlen("PRIORITY=")] = '0' + LOG_PRI(priority);
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IOVEC_SET_STRING(iovec[n++], syslog_priority);
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if (priority & LOG_FACMASK) {
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snprintf(syslog_facility, sizeof(syslog_facility), "SYSLOG_FACILITY=%i", LOG_FAC(priority));
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IOVEC_SET_STRING(iovec[n++], syslog_facility);
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}
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if (s->identifier) {
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syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
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if (syslog_identifier)
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IOVEC_SET_STRING(iovec[n++], syslog_identifier);
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}
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message = strappend("MESSAGE=", p);
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if (message)
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IOVEC_SET_STRING(iovec[n++], message);
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#ifdef HAVE_SELINUX
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if (s->security_context) {
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label = (char*) s->security_context;
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label_len = strlen((char*) s->security_context);
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}
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#endif
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server_dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, label, label_len, s->unit_id, priority, 0);
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return 0;
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}
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static int stdout_stream_line(StdoutStream *s, char *p) {
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int r;
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assert(s);
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assert(p);
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p = strstrip(p);
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switch (s->state) {
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case STDOUT_STREAM_IDENTIFIER:
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if (isempty(p))
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s->identifier = NULL;
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else {
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s->identifier = strdup(p);
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if (!s->identifier)
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return log_oom();
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}
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s->state = STDOUT_STREAM_UNIT_ID;
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return 0;
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case STDOUT_STREAM_UNIT_ID:
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if (s->ucred.uid == 0) {
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if (isempty(p))
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s->unit_id = NULL;
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else {
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s->unit_id = strdup(p);
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if (!s->unit_id)
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return log_oom();
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}
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}
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s->state = STDOUT_STREAM_PRIORITY;
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return 0;
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case STDOUT_STREAM_PRIORITY:
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r = safe_atoi(p, &s->priority);
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if (r < 0 || s->priority < 0 || s->priority > 999) {
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log_warning("Failed to parse log priority line.");
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return -EINVAL;
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}
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s->state = STDOUT_STREAM_LEVEL_PREFIX;
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return 0;
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case STDOUT_STREAM_LEVEL_PREFIX:
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r = parse_boolean(p);
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if (r < 0) {
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log_warning("Failed to parse level prefix line.");
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return -EINVAL;
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}
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s->level_prefix = !!r;
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s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
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return 0;
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case STDOUT_STREAM_FORWARD_TO_SYSLOG:
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r = parse_boolean(p);
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if (r < 0) {
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log_warning("Failed to parse forward to syslog line.");
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return -EINVAL;
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}
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s->forward_to_syslog = !!r;
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s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
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return 0;
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case STDOUT_STREAM_FORWARD_TO_KMSG:
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r = parse_boolean(p);
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if (r < 0) {
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log_warning("Failed to parse copy to kmsg line.");
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return -EINVAL;
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}
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s->forward_to_kmsg = !!r;
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s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
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return 0;
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case STDOUT_STREAM_FORWARD_TO_CONSOLE:
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r = parse_boolean(p);
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if (r < 0) {
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log_warning("Failed to parse copy to console line.");
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return -EINVAL;
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}
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s->forward_to_console = !!r;
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s->state = STDOUT_STREAM_RUNNING;
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return 0;
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case STDOUT_STREAM_RUNNING:
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return stdout_stream_log(s, p);
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}
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assert_not_reached("Unknown stream state");
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}
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static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
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char *p;
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size_t remaining;
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int r;
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assert(s);
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p = s->buffer;
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remaining = s->length;
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for (;;) {
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char *end;
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size_t skip;
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end = memchr(p, '\n', remaining);
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if (end)
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skip = end - p + 1;
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else if (remaining >= sizeof(s->buffer) - 1) {
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end = p + sizeof(s->buffer) - 1;
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skip = remaining;
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} else
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break;
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*end = 0;
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r = stdout_stream_line(s, p);
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if (r < 0)
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return r;
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remaining -= skip;
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p += skip;
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}
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if (force_flush && remaining > 0) {
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p[remaining] = 0;
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r = stdout_stream_line(s, p);
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if (r < 0)
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return r;
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p += remaining;
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remaining = 0;
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}
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if (p > s->buffer) {
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memmove(s->buffer, p, remaining);
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s->length = remaining;
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}
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return 0;
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}
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static int stdout_stream_process(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
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StdoutStream *s = userdata;
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ssize_t l;
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int r;
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assert(s);
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if ((revents|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
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log_error("Got invalid event from epoll for stdout stream: %"PRIx32, revents);
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goto terminate;
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}
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l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
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if (l < 0) {
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if (errno == EAGAIN)
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return 0;
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log_warning_errno(errno, "Failed to read from stream: %m");
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goto terminate;
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}
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if (l == 0) {
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stdout_stream_scan(s, true);
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goto terminate;
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}
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s->length += l;
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r = stdout_stream_scan(s, false);
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if (r < 0)
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goto terminate;
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return 1;
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terminate:
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stdout_stream_free(s);
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return 0;
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}
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void stdout_stream_free(StdoutStream *s) {
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assert(s);
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if (s->server) {
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assert(s->server->n_stdout_streams > 0);
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s->server->n_stdout_streams --;
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LIST_REMOVE(stdout_stream, s->server->stdout_streams, s);
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}
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if (s->event_source) {
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sd_event_source_set_enabled(s->event_source, SD_EVENT_OFF);
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s->event_source = sd_event_source_unref(s->event_source);
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}
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safe_close(s->fd);
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#ifdef HAVE_SELINUX
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if (s->security_context)
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freecon(s->security_context);
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#endif
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free(s->identifier);
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free(s->unit_id);
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free(s);
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}
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static int stdout_stream_new(sd_event_source *es, int listen_fd, uint32_t revents, void *userdata) {
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Server *s = userdata;
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StdoutStream *stream;
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int fd, r;
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assert(s);
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if (revents != EPOLLIN) {
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log_error("Got invalid event from epoll for stdout server fd: %"PRIx32, revents);
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return -EIO;
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}
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fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
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if (fd < 0) {
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if (errno == EAGAIN)
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return 0;
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log_error_errno(errno, "Failed to accept stdout connection: %m");
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return -errno;
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}
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if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
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log_warning("Too many stdout streams, refusing connection.");
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safe_close(fd);
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return 0;
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}
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stream = new0(StdoutStream, 1);
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if (!stream) {
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safe_close(fd);
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return log_oom();
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}
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stream->fd = fd;
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r = getpeercred(fd, &stream->ucred);
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if (r < 0) {
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log_error_errno(errno, "Failed to determine peer credentials: %m");
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goto fail;
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}
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#ifdef HAVE_SELINUX
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if (mac_selinux_use()) {
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if (getpeercon(fd, &stream->security_context) < 0 && errno != ENOPROTOOPT)
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log_error_errno(errno, "Failed to determine peer security context: %m");
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}
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#endif
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if (shutdown(fd, SHUT_WR) < 0) {
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log_error_errno(errno, "Failed to shutdown writing side of socket: %m");
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goto fail;
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}
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r = sd_event_add_io(s->event, &stream->event_source, fd, EPOLLIN, stdout_stream_process, stream);
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if (r < 0) {
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log_error_errno(r, "Failed to add stream to event loop: %m");
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goto fail;
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}
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r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5);
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if (r < 0) {
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log_error_errno(r, "Failed to adjust stdout event source priority: %m");
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goto fail;
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}
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stream->server = s;
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LIST_PREPEND(stdout_stream, s->stdout_streams, stream);
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s->n_stdout_streams ++;
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return 0;
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fail:
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stdout_stream_free(stream);
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return 0;
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}
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int server_open_stdout_socket(Server *s) {
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int r;
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assert(s);
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if (s->stdout_fd < 0) {
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union sockaddr_union sa = {
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.un.sun_family = AF_UNIX,
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.un.sun_path = "/run/systemd/journal/stdout",
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};
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s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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if (s->stdout_fd < 0)
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return log_error_errno(errno, "socket() failed: %m");
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unlink(sa.un.sun_path);
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r = bind(s->stdout_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
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if (r < 0)
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return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
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chmod(sa.un.sun_path, 0666);
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if (listen(s->stdout_fd, SOMAXCONN) < 0)
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return log_error_errno(errno, "listen(%s) failed: %m", sa.un.sun_path);
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} else
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fd_nonblock(s->stdout_fd, 1);
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r = sd_event_add_io(s->event, &s->stdout_event_source, s->stdout_fd, EPOLLIN, stdout_stream_new, s);
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if (r < 0)
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return log_error_errno(r, "Failed to add stdout server fd to event source: %m");
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r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+10);
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if (r < 0)
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return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
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return 0;
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}
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