1 /* SPDX-License-Identifier: LGPL-2.1+ */
11 #include "alloc-util.h"
13 #include "errno-util.h"
16 #include "journal-file.h"
17 #include "journal-remote-write.h"
18 #include "journal-remote.h"
19 #include "journald-native.h"
21 #include "parse-util.h"
22 #include "process-util.h"
23 #include "socket-util.h"
24 #include "stdio-util.h"
25 #include "string-util.h"
28 #define REMOTE_JOURNAL_PATH "/var/log/journal/remote"
30 #define filename_escape(s) xescape((s), "/ ")
32 static int open_output(RemoteServer
*s
, Writer
*w
, const char* host
) {
33 _cleanup_free_
char *_filename
= NULL
;
37 switch (s
->split_mode
) {
38 case JOURNAL_WRITE_SPLIT_NONE
:
42 case JOURNAL_WRITE_SPLIT_HOST
: {
43 _cleanup_free_
char *name
;
47 name
= filename_escape(host
);
51 r
= asprintf(&_filename
, "%s/remote-%s.journal", s
->output
, name
);
60 assert_not_reached("what?");
63 r
= journal_file_open_reliably(filename
,
65 s
->compress
, (uint64_t) -1, s
->seal
,
70 return log_error_errno(r
, "Failed to open output journal %s: %m", filename
);
72 log_debug("Opened output file %s", w
->journal
->path
);
76 /**********************************************************************
77 **********************************************************************
78 **********************************************************************/
80 static int init_writer_hashmap(RemoteServer
*s
) {
81 static const struct hash_ops
* const hash_ops
[] = {
82 [JOURNAL_WRITE_SPLIT_NONE
] = NULL
,
83 [JOURNAL_WRITE_SPLIT_HOST
] = &string_hash_ops
,
87 assert(s
->split_mode
>= 0 && s
->split_mode
< (int) ELEMENTSOF(hash_ops
));
89 s
->writers
= hashmap_new(hash_ops
[s
->split_mode
]);
96 int journal_remote_get_writer(RemoteServer
*s
, const char *host
, Writer
**writer
) {
97 _cleanup_(writer_unrefp
) Writer
*w
= NULL
;
101 switch(s
->split_mode
) {
102 case JOURNAL_WRITE_SPLIT_NONE
:
103 key
= "one and only";
106 case JOURNAL_WRITE_SPLIT_HOST
:
112 assert_not_reached("what split mode?");
115 w
= hashmap_get(s
->writers
, key
);
123 if (s
->split_mode
== JOURNAL_WRITE_SPLIT_HOST
) {
124 w
->hashmap_key
= strdup(key
);
129 r
= open_output(s
, w
, host
);
133 r
= hashmap_put(s
->writers
, w
->hashmap_key
?: key
, w
);
138 *writer
= TAKE_PTR(w
);
143 /**********************************************************************
144 **********************************************************************
145 **********************************************************************/
147 /* This should go away as soon as µhttpd allows state to be passed around. */
148 RemoteServer
*journal_remote_server_global
;
150 static int dispatch_raw_source_event(sd_event_source
*event
,
154 static int dispatch_raw_source_until_block(sd_event_source
*event
,
156 static int dispatch_blocking_source_event(sd_event_source
*event
,
158 static int dispatch_raw_connection_event(sd_event_source
*event
,
163 static int get_source_for_fd(RemoteServer
*s
,
164 int fd
, char *name
, RemoteSource
**source
) {
168 /* This takes ownership of name, but only on success. */
173 if (!GREEDY_REALLOC0(s
->sources
, s
->sources_size
, fd
+ 1))
176 r
= journal_remote_get_writer(s
, name
, &writer
);
178 return log_warning_errno(r
, "Failed to get writer for source %s: %m",
181 if (!s
->sources
[fd
]) {
182 s
->sources
[fd
] = source_new(fd
, false, name
, writer
);
183 if (!s
->sources
[fd
]) {
184 writer_unref(writer
);
191 *source
= s
->sources
[fd
];
195 static int remove_source(RemoteServer
*s
, int fd
) {
196 RemoteSource
*source
;
199 assert(fd
>= 0 && fd
< (ssize_t
) s
->sources_size
);
201 source
= s
->sources
[fd
];
203 /* this closes fd too */
205 s
->sources
[fd
] = NULL
;
212 int journal_remote_add_source(RemoteServer
*s
, int fd
, char* name
, bool own_name
) {
213 RemoteSource
*source
= NULL
;
216 /* This takes ownership of name, even on failure, if own_name is true. */
228 r
= get_source_for_fd(s
, fd
, name
, &source
);
230 log_error_errno(r
, "Failed to create source for fd:%d (%s): %m",
236 r
= sd_event_add_io(s
->events
, &source
->event
,
237 fd
, EPOLLIN
|EPOLLRDHUP
|EPOLLPRI
,
238 dispatch_raw_source_event
, source
);
240 /* Add additional source for buffer processing. It will be
242 r
= sd_event_add_defer(s
->events
, &source
->buffer_event
,
243 dispatch_raw_source_until_block
, source
);
245 sd_event_source_set_enabled(source
->buffer_event
, SD_EVENT_OFF
);
246 } else if (r
== -EPERM
) {
247 log_debug("Falling back to sd_event_add_defer for fd:%d (%s)", fd
, name
);
248 r
= sd_event_add_defer(s
->events
, &source
->event
,
249 dispatch_blocking_source_event
, source
);
251 sd_event_source_set_enabled(source
->event
, SD_EVENT_ON
);
254 log_error_errno(r
, "Failed to register event source for fd:%d: %m",
259 r
= sd_event_source_set_description(source
->event
, name
);
261 log_error_errno(r
, "Failed to set source name for fd:%d: %m", fd
);
265 return 1; /* work to do */
268 remove_source(s
, fd
);
272 int journal_remote_add_raw_socket(RemoteServer
*s
, int fd
) {
274 _cleanup_close_
int fd_
= fd
;
275 char name
[STRLEN("raw-socket-") + DECIMAL_STR_MAX(int) + 1];
279 r
= sd_event_add_io(s
->events
, &s
->listen_event
,
281 dispatch_raw_connection_event
, s
);
285 xsprintf(name
, "raw-socket-%d", fd
);
287 r
= sd_event_source_set_description(s
->listen_event
, name
);
296 /**********************************************************************
297 **********************************************************************
298 **********************************************************************/
300 int journal_remote_server_init(
303 JournalWriteSplitMode split_mode
,
311 assert(journal_remote_server_global
== NULL
);
312 journal_remote_server_global
= s
;
314 s
->split_mode
= split_mode
;
315 s
->compress
= compress
;
320 else if (split_mode
== JOURNAL_WRITE_SPLIT_NONE
)
321 s
->output
= REMOTE_JOURNAL_PATH
"/remote.journal";
322 else if (split_mode
== JOURNAL_WRITE_SPLIT_HOST
)
323 s
->output
= REMOTE_JOURNAL_PATH
;
325 assert_not_reached("bad split mode");
327 r
= sd_event_default(&s
->events
);
329 return log_error_errno(r
, "Failed to allocate event loop: %m");
331 r
= init_writer_hashmap(s
);
339 static void MHDDaemonWrapper_free(MHDDaemonWrapper
*d
) {
340 MHD_stop_daemon(d
->daemon
);
341 sd_event_source_unref(d
->io_event
);
342 sd_event_source_unref(d
->timer_event
);
347 void journal_remote_server_destroy(RemoteServer
*s
) {
351 hashmap_free_with_destructor(s
->daemons
, MHDDaemonWrapper_free
);
354 assert(s
->sources_size
== 0 || s
->sources
);
355 for (i
= 0; i
< s
->sources_size
; i
++)
359 writer_unref(s
->_single_writer
);
360 hashmap_free(s
->writers
);
362 sd_event_source_unref(s
->sigterm_event
);
363 sd_event_source_unref(s
->sigint_event
);
364 sd_event_source_unref(s
->listen_event
);
365 sd_event_unref(s
->events
);
367 if (s
== journal_remote_server_global
)
368 journal_remote_server_global
= NULL
;
370 /* fds that we're listening on remain open... */
373 /**********************************************************************
374 **********************************************************************
375 **********************************************************************/
377 int journal_remote_handle_raw_source(
378 sd_event_source
*event
,
383 RemoteSource
*source
;
386 /* Returns 1 if there might be more data pending,
387 * 0 if data is currently exhausted, negative on error.
390 assert(fd
>= 0 && fd
< (ssize_t
) s
->sources_size
);
391 source
= s
->sources
[fd
];
392 assert(source
->importer
.fd
== fd
);
394 r
= process_source(source
, s
->compress
, s
->seal
);
395 if (journal_importer_eof(&source
->importer
)) {
398 log_debug("EOF reached with source %s (fd=%d)",
399 source
->importer
.name
, source
->importer
.fd
);
401 remaining
= journal_importer_bytes_remaining(&source
->importer
);
403 log_notice("Premature EOF. %zu bytes lost.", remaining
);
404 remove_source(s
, source
->importer
.fd
);
405 log_debug("%zu active sources remaining", s
->active
);
407 } else if (r
== -E2BIG
) {
408 log_notice("Entry with too many fields, skipped");
410 } else if (r
== -ENOBUFS
) {
411 log_notice("Entry too big, skipped");
413 } else if (r
== -EAGAIN
) {
416 log_debug_errno(r
, "Closing connection: %m");
417 remove_source(s
, fd
);
423 static int dispatch_raw_source_until_block(sd_event_source
*event
,
425 RemoteSource
*source
= userdata
;
428 /* Make sure event stays around even if source is destroyed */
429 sd_event_source_ref(event
);
431 r
= journal_remote_handle_raw_source(event
, source
->importer
.fd
, EPOLLIN
, journal_remote_server_global
);
433 /* No more data for now */
434 sd_event_source_set_enabled(event
, SD_EVENT_OFF
);
436 sd_event_source_unref(event
);
441 static int dispatch_raw_source_event(sd_event_source
*event
,
445 RemoteSource
*source
= userdata
;
448 assert(source
->event
);
449 assert(source
->buffer_event
);
451 r
= journal_remote_handle_raw_source(event
, fd
, EPOLLIN
, journal_remote_server_global
);
453 /* Might have more data. We need to rerun the handler
454 * until we are sure the buffer is exhausted. */
455 sd_event_source_set_enabled(source
->buffer_event
, SD_EVENT_ON
);
460 static int dispatch_blocking_source_event(sd_event_source
*event
,
462 RemoteSource
*source
= userdata
;
464 return journal_remote_handle_raw_source(event
, source
->importer
.fd
, EPOLLIN
, journal_remote_server_global
);
467 static int accept_connection(
473 _cleanup_close_
int fd2
= -1;
476 log_debug("Accepting new %s connection on fd:%d", type
, fd
);
477 fd2
= accept4(fd
, &addr
->sockaddr
.sa
, &addr
->size
, SOCK_NONBLOCK
|SOCK_CLOEXEC
);
479 if (ERRNO_IS_ACCEPT_AGAIN(errno
))
482 return log_error_errno(errno
, "accept() on fd:%d failed: %m", fd
);
485 switch(socket_address_family(addr
)) {
488 _cleanup_free_
char *a
= NULL
;
491 r
= socket_address_print(addr
, &a
);
493 return log_error_errno(r
, "socket_address_print(): %m");
495 r
= socknameinfo_pretty(&addr
->sockaddr
, addr
->size
, &b
);
497 return log_error_errno(r
, "Resolving hostname failed: %m");
499 log_debug("Accepted %s %s connection from %s",
501 socket_address_family(addr
) == AF_INET
? "IP" : "IPv6",
509 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
510 "Rejected %s connection with unsupported family %d",
511 type
, socket_address_family(addr
));
515 static int dispatch_raw_connection_event(
516 sd_event_source
*event
,
521 RemoteServer
*s
= userdata
;
523 SocketAddress addr
= {
524 .size
= sizeof(union sockaddr_union
),
527 char *hostname
= NULL
;
529 fd2
= accept_connection("raw", fd
, &addr
, &hostname
);
535 return journal_remote_add_source(s
, fd2
, hostname
, true);