/*-*- 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> #include <sys/epoll.h> #ifdef HAVE_SELINUX #include <selinux/selinux.h> #endif #include "socket-util.h" #include "journald-server.h" #include "journald-stream.h" #include "journald-syslog.h" #include "journald-kmsg.h" #include "journald-console.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; LIST_FIELDS(StdoutStream, stdout_stream); }; static int stdout_stream_log(StdoutStream *s, const char *p) { struct iovec iovec[N_IOVEC_META_FIELDS + 5]; char *message = NULL, *syslog_priority = NULL, *syslog_facility = NULL, *syslog_identifier = NULL; unsigned n = 0; int priority; 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((char**) &p, &priority); 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); IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout"); if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0) IOVEC_SET_STRING(iovec[n++], syslog_priority); if (priority & LOG_FACMASK) if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0) 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); free(message); free(syslog_priority); free(syslog_facility); free(syslog_identifier); 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; } int stdout_stream_process(StdoutStream *s) { ssize_t l; int r; assert(s); 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"); return -errno; } if (l == 0) { r = stdout_stream_scan(s, true); if (r < 0) return r; return 0; } s->length += l; r = stdout_stream_scan(s, false); if (r < 0) return r; return 1; } 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(StdoutStream, stdout_stream, s->server->stdout_streams, s); } if (s->fd >= 0) { if (s->server) epoll_ctl(s->server->epoll_fd, EPOLL_CTL_DEL, s->fd, NULL); close_nointr_nofail(s->fd); } #ifdef HAVE_SELINUX if (s->security_context) freecon(s->security_context); #endif free(s->identifier); free(s); } int stdout_stream_new(Server *s) { StdoutStream *stream; int fd, r; socklen_t len; struct epoll_event ev; assert(s); 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."); close_nointr_nofail(fd); return 0; } stream = new0(StdoutStream, 1); if (!stream) { close_nointr_nofail(fd); return log_oom(); } stream->fd = fd; len = sizeof(stream->ucred); if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &stream->ucred, &len) < 0) { log_error("Failed to determine peer credentials: %m"); r = -errno; goto fail; } #ifdef HAVE_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"); r = -errno; goto fail; } zero(ev); ev.data.ptr = stream; ev.events = EPOLLIN; if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) { log_error("Failed to add stream to event loop: %m"); r = -errno; goto fail; } stream->server = s; LIST_PREPEND(StdoutStream, stdout_stream, s->stdout_streams, stream); s->n_stdout_streams ++; return 0; fail: stdout_stream_free(stream); return r; } int server_open_stdout_socket(Server *s) { union sockaddr_union sa; int r; struct epoll_event ev; 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) { log_error("socket() failed: %m"); return -errno; } zero(sa); sa.un.sun_family = AF_UNIX; strncpy(sa.un.sun_path, "/run/systemd/journal/stdout", sizeof(sa.un.sun_path)); 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("liste() failed: %m"); return -errno; } } else fd_nonblock(s->stdout_fd, 1); zero(ev); ev.events = EPOLLIN; ev.data.fd = s->stdout_fd; if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, s->stdout_fd, &ev) < 0) { log_error("Failed to add stdout server fd to epoll object: %m"); return -errno; } return 0; }