+++ /dev/null
-/*-*- 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 <unistd.h>
-#include <stddef.h>
-
-#ifdef HAVE_SELINUX
-#include <selinux/selinux.h>
-#endif
-
-#include "sd-event.h"
-#include "sd-daemon.h"
-#include "socket-util.h"
-#include "selinux-util.h"
-#include "mkdir.h"
-#include "fileio.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;
-
- bool fdstore:1;
-
- char buffer[LINE_MAX+1];
- size_t length;
-
- sd_event_source *event_source;
-
- char *state_file;
-
- LIST_FIELDS(StdoutStream, stdout_stream);
-};
-
-void stdout_stream_free(StdoutStream *s) {
- if (!s)
- return;
-
- 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->state_file);
-
- free(s);
-}
-
-DEFINE_TRIVIAL_CLEANUP_FUNC(StdoutStream*, stdout_stream_free);
-
-static void stdout_stream_destroy(StdoutStream *s) {
- if (!s)
- return;
-
- if (s->state_file)
- 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 finish;
-
- 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",
- s->priority,
- s->level_prefix,
- s->forward_to_syslog,
- s->forward_to_kmsg,
- s->forward_to_console);
-
- if (!isempty(s->identifier)) {
- _cleanup_free_ char *escaped;
-
- escaped = cescape(s->identifier);
- if (!escaped) {
- r = -ENOMEM;
- goto finish;
- }
-
- 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 finish;
- }
-
- fprintf(f, "UNIT=%s\n", escaped);
- }
-
- r = fflush_and_check(f);
- if (r < 0)
- goto finish;
-
- if (rename(temp_path, s->state_file) < 0) {
- r = -errno;
- goto finish;
- }
-
- free(temp_path);
- temp_path = NULL;
-
- /* Store the connection fd in PID 1, so that we get it passed
- * in again on next start */
- if (!s->fdstore) {
- sd_pid_notify_with_fds(0, false, "FDSTORE=1", &s->fd, 1);
- s->fdstore = true;
- }
-
-finish:
- if (temp_path)
- unlink(temp_path);
-
- if (r < 0)
- log_error_errno(r, "Failed to save stream data %s: %m", s->state_file);
-
- return r;
-}
-
-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=")-1 + DECIMAL_STR_MAX(int) + 1];
- _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) {
- xsprintf(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;
-
- /* 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, 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_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;
- int r;
-
- assert(s);
- assert(fd >= 0);
-
- stream = new0(StdoutStream, 1);
- if (!stream)
- return log_oom();
-
- stream->fd = -1;
- stream->priority = LOG_INFO;
-
- r = getpeercred(fd, &stream->ucred);
- if (r < 0)
- return log_error_errno(r, "Failed to determine peer credentials: %m");
-
-#ifdef HAVE_SELINUX
- if (mac_selinux_use()) {
- if (getpeercon(fd, &stream->security_context) < 0 && errno != ENOPROTOOPT)
- log_error_errno(errno, "Failed to determine peer security context: %m");
- }
-#endif
-
- (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;
-
- log_error_errno(errno, "Failed to accept stdout connection: %m");
- return -errno;
- }
-
- 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;
- 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,
- 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;
- }
-
- 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;
-}
-
-static 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, FDSet *fds) {
- 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)
- return log_error_errno(errno, "socket() failed: %m");
-
- 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)
- return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
-
- 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+10);
- if (r < 0)
- return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
-
- /* Try to restore streams, but don't bother if this fails */
- (void) server_restore_streams(s, fds);
-
- return 0;
-}
~ianmdlvl / elogind.git / blobdiff