/*-*- 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 (use_selinux()) { 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("Failed to add stream to event loop: %s", strerror(-r)); goto fail; } r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5); if (r < 0) { log_error("Failed to adjust stdout event source priority: %s", strerror(-r)); 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() failed: %m"); return -errno; } chmod(sa.un.sun_path, 0666); if (listen(s->stdout_fd, SOMAXCONN) < 0) { log_error("listen() failed: %m"); 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("Failed to add stdout server fd to event source: %s", strerror(-r)); return r; } r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+10); if (r < 0) { log_error("Failed to adjust priority of stdout server event source: %s", strerror(-r)); return r; } return 0; }