diff options
Diffstat (limited to 'src/journal/journald-stream.c')
| -rw-r--r-- | src/journal/journald-stream.c | 990 |
1 files changed, 990 insertions, 0 deletions
diff --git a/src/journal/journald-stream.c b/src/journal/journald-stream.c new file mode 100644 index 0000000..f2f3f0a --- /dev/null +++ b/src/journal/journald-stream.c @@ -0,0 +1,990 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <stddef.h> +#include <unistd.h> + +#if HAVE_SELINUX +#include <selinux/selinux.h> +#endif + +#include "sd-daemon.h" +#include "sd-event.h" + +#include "alloc-util.h" +#include "dirent-util.h" +#include "env-file.h" +#include "errno-util.h" +#include "escape.h" +#include "fd-util.h" +#include "fileio.h" +#include "fs-util.h" +#include "io-util.h" +#include "journald-console.h" +#include "journald-context.h" +#include "journald-kmsg.h" +#include "journald-server.h" +#include "journald-stream.h" +#include "journald-syslog.h" +#include "journald-wall.h" +#include "mkdir.h" +#include "parse-util.h" +#include "process-util.h" +#include "selinux-util.h" +#include "socket-util.h" +#include "stdio-util.h" +#include "string-util.h" +#include "syslog-util.h" +#include "tmpfile-util.h" +#include "unit-name.h" +#include "user-util.h" + +#define STDOUT_STREAMS_MAX 4096 + +/* During the "setup" protocol phase of the stream logic let's define a different maximum line length than + * during the actual operational phase. We want to allow users to specify very short line lengths after all, + * but the unit name we embed in the setup protocol might be longer than that. Hence, during the setup phase + * let's enforce a line length matching the maximum unit name length (255) */ +#define STDOUT_STREAM_SETUP_PROTOCOL_LINE_MAX (UNIT_NAME_MAX-1U) + +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; + +/* The different types of log record terminators: a real \n was read, a NUL character was read, the maximum line length + * was reached, or the end of the stream was reached */ + +typedef enum LineBreak { + LINE_BREAK_NEWLINE, + LINE_BREAK_NUL, + LINE_BREAK_LINE_MAX, + LINE_BREAK_EOF, + LINE_BREAK_PID_CHANGE, + _LINE_BREAK_MAX, + _LINE_BREAK_INVALID = -EINVAL, +} LineBreak; + +struct StdoutStream { + Server *server; + StdoutStreamState state; + + int fd; + + struct ucred ucred; + char *label; + 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; + bool in_notify_queue:1; + + char *buffer; + size_t length; + + sd_event_source *event_source; + + char *state_file; + + ClientContext *context; + + LIST_FIELDS(StdoutStream, stdout_stream); + LIST_FIELDS(StdoutStream, stdout_stream_notify_queue); + + char id_field[STRLEN("_STREAM_ID=") + SD_ID128_STRING_MAX]; +}; + +StdoutStream* stdout_stream_free(StdoutStream *s) { + if (!s) + return NULL; + + if (s->server) { + if (s->context) + client_context_release(s->server, s->context); + + assert(s->server->n_stdout_streams > 0); + s->server->n_stdout_streams--; + LIST_REMOVE(stdout_stream, s->server->stdout_streams, s); + + if (s->in_notify_queue) + LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s); + + (void) server_start_or_stop_idle_timer(s->server); /* Maybe we are idle now? */ + } + + sd_event_source_disable_unref(s->event_source); + safe_close(s->fd); + free(s->label); + free(s->identifier); + free(s->unit_id); + free(s->state_file); + free(s->buffer); + + return mfree(s); +} + +DEFINE_TRIVIAL_CLEANUP_FUNC(StdoutStream*, stdout_stream_free); + +void stdout_stream_destroy(StdoutStream *s) { + if (!s) + return; + + if (s->state_file) + (void) unlink(s->state_file); + + stdout_stream_free(s); +} + +static int stdout_stream_save(StdoutStream *s) { + _cleanup_(unlink_and_freep) 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 */ + r = asprintf(&s->state_file, "%s/streams/%lu:%lu", s->server->runtime_directory, (unsigned long) st.st_dev, (unsigned long) st.st_ino); + if (r < 0) + return log_oom(); + } + + (void) mkdir_parents(s->state_file, 0755); + + r = fopen_temporary(s->state_file, &f, &temp_path); + if (r < 0) + goto fail; + + 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" + "STREAM_ID=%s\n", + s->priority, + s->level_prefix, + s->forward_to_syslog, + s->forward_to_kmsg, + s->forward_to_console, + s->id_field + STRLEN("_STREAM_ID=")); + + if (!isempty(s->identifier)) { + _cleanup_free_ char *escaped = NULL; + + escaped = cescape(s->identifier); + if (!escaped) { + r = -ENOMEM; + goto fail; + } + + fprintf(f, "IDENTIFIER=%s\n", escaped); + } + + if (!isempty(s->unit_id)) { + _cleanup_free_ char *escaped = NULL; + + escaped = cescape(s->unit_id); + if (!escaped) { + r = -ENOMEM; + goto fail; + } + + fprintf(f, "UNIT=%s\n", escaped); + } + + r = fflush_and_check(f); + if (r < 0) + goto fail; + + if (rename(temp_path, s->state_file) < 0) { + r = -errno; + goto fail; + } + + temp_path = mfree(temp_path); + + if (!s->fdstore && !s->in_notify_queue) { + LIST_PREPEND(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s); + s->in_notify_queue = true; + + if (s->server->notify_event_source) { + r = sd_event_source_set_enabled(s->server->notify_event_source, SD_EVENT_ON); + if (r < 0) + log_warning_errno(r, "Failed to enable notify event source: %m"); + } + } + + return 0; + +fail: + (void) unlink(s->state_file); + return log_error_errno(r, "Failed to save stream data %s: %m", s->state_file); +} + +static int stdout_stream_log( + StdoutStream *s, + const char *p, + LineBreak line_break) { + + struct iovec *iovec; + int priority; + char syslog_priority[] = "PRIORITY=\0"; + char syslog_facility[STRLEN("SYSLOG_FACILITY=") + DECIMAL_STR_MAX(int) + 1]; + _cleanup_free_ char *message = NULL, *syslog_identifier = NULL; + size_t n = 0, m; + int r; + + assert(s); + assert(p); + + assert(line_break >= 0); + assert(line_break < _LINE_BREAK_MAX); + + if (s->context) + (void) client_context_maybe_refresh(s->server, s->context, NULL, NULL, 0, NULL, USEC_INFINITY); + else if (pid_is_valid(s->ucred.pid)) { + r = client_context_acquire(s->server, s->ucred.pid, &s->ucred, s->label, strlen_ptr(s->label), s->unit_id, &s->context); + if (r < 0) + log_warning_errno(r, "Failed to acquire client context, ignoring: %m"); + } + + priority = s->priority; + + if (s->level_prefix) + syslog_parse_priority(&p, &priority, false); + + if (!client_context_test_priority(s->context, priority)) + return 0; + + if (isempty(p)) + return 0; + + 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); + + m = N_IOVEC_META_FIELDS + 7 + client_context_extra_fields_n_iovec(s->context); + iovec = newa(struct iovec, m); + + iovec[n++] = IOVEC_MAKE_STRING("_TRANSPORT=stdout"); + iovec[n++] = IOVEC_MAKE_STRING(s->id_field); + + syslog_priority[STRLEN("PRIORITY=")] = '0' + LOG_PRI(priority); + iovec[n++] = IOVEC_MAKE_STRING(syslog_priority); + + if (priority & LOG_FACMASK) { + xsprintf(syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)); + iovec[n++] = IOVEC_MAKE_STRING(syslog_facility); + } + + if (s->identifier) { + syslog_identifier = strjoin("SYSLOG_IDENTIFIER=", s->identifier); + if (syslog_identifier) + iovec[n++] = IOVEC_MAKE_STRING(syslog_identifier); + } + + static const char * const line_break_field_table[_LINE_BREAK_MAX] = { + [LINE_BREAK_NEWLINE] = NULL, /* Do not add field if traditional newline */ + [LINE_BREAK_NUL] = "_LINE_BREAK=nul", + [LINE_BREAK_LINE_MAX] = "_LINE_BREAK=line-max", + [LINE_BREAK_EOF] = "_LINE_BREAK=eof", + [LINE_BREAK_PID_CHANGE] = "_LINE_BREAK=pid-change", + }; + + const char *c = line_break_field_table[line_break]; + + /* If this log message was generated due to an uncommon line break then mention this in the log + * entry */ + if (c) + iovec[n++] = IOVEC_MAKE_STRING(c); + + message = strjoin("MESSAGE=", p); + if (message) + iovec[n++] = IOVEC_MAKE_STRING(message); + + server_dispatch_message(s->server, iovec, n, m, s->context, NULL, priority, 0); + return 0; +} + +static int syslog_parse_priority_and_facility(const char *s) { + int prio, r; + + /* Parses both facility and priority in one value, i.e. is different from log_level_from_string() + * which only parses the priority and refuses any facility value */ + + r = safe_atoi(s, &prio); + if (r < 0) + return r; + + if (prio < 0 || prio > 999) + return -ERANGE; + + return prio; +} + +static int stdout_stream_line(StdoutStream *s, char *p, LineBreak line_break) { + char *orig; + int r; + + assert(s); + assert(p); + + orig = p; + p = strstrip(p); + + /* line breaks by NUL, line max length or EOF are not permissible during the negotiation part of the protocol */ + if (line_break != LINE_BREAK_NEWLINE && s->state != STDOUT_STREAM_RUNNING) + return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), + "Control protocol line not properly terminated."); + + switch (s->state) { + + case STDOUT_STREAM_IDENTIFIER: + if (!isempty(p)) { + 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 && + unit_name_is_valid(p, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) { + + s->unit_id = strdup(p); + if (!s->unit_id) + return log_oom(); + } + + s->state = STDOUT_STREAM_PRIORITY; + return 0; + + case STDOUT_STREAM_PRIORITY: { + int priority; + + priority = syslog_parse_priority_and_facility(p); + if (priority < 0) + return log_warning_errno(priority, "Failed to parse log priority line: %m"); + + s->priority = priority; + s->state = STDOUT_STREAM_LEVEL_PREFIX; + return 0; + } + + case STDOUT_STREAM_LEVEL_PREFIX: + r = parse_boolean(p); + if (r < 0) + return log_warning_errno(r, "Failed to parse level prefix line: %m"); + + 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) + return log_warning_errno(r, "Failed to parse forward to syslog line: %m"); + + 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) + return log_warning_errno(r, "Failed to parse copy to kmsg line: %m"); + + 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) + return log_warning_errno(r, "Failed to parse copy to console line."); + + 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, orig, line_break); + } + + assert_not_reached(); +} + +static int stdout_stream_found( + StdoutStream *s, + char *p, + size_t l, + LineBreak line_break) { + + char saved; + int r; + + assert(s); + assert(p); + + /* Let's NUL terminate the specified buffer for this call, and revert back afterwards */ + saved = p[l]; + p[l] = 0; + r = stdout_stream_line(s, p, line_break); + p[l] = saved; + + return r; +} + +static size_t stdout_stream_line_max(StdoutStream *s) { + assert(s); + + /* During the "setup" phase of our protocol, let's ensure we use a line length where a full unit name + * can fit in */ + if (s->state != STDOUT_STREAM_RUNNING) + return STDOUT_STREAM_SETUP_PROTOCOL_LINE_MAX; + + /* After the protocol's "setup" phase is complete, let's use whatever the user configured */ + return s->server->line_max; +} + +static int stdout_stream_scan( + StdoutStream *s, + char *p, + size_t remaining, + LineBreak force_flush, + size_t *ret_consumed) { + + size_t consumed = 0; + int r; + + assert(s); + assert(p); + + + for (;;) { + LineBreak line_break; + size_t skip, found; + char *end1, *end2; + size_t tmp_remaining, line_max; + + line_max = stdout_stream_line_max(s); + tmp_remaining = MIN(remaining, line_max); + + end1 = memchr(p, '\n', tmp_remaining); + end2 = memchr(p, 0, end1 ? (size_t) (end1 - p) : tmp_remaining); + + if (end2) { + /* We found a NUL terminator */ + found = end2 - p; + skip = found + 1; + line_break = LINE_BREAK_NUL; + } else if (end1) { + /* We found a \n terminator */ + found = end1 - p; + skip = found + 1; + line_break = LINE_BREAK_NEWLINE; + } else if (remaining >= line_max) { + /* Force a line break after the maximum line length */ + found = skip = line_max; + line_break = LINE_BREAK_LINE_MAX; + } else + break; + + r = stdout_stream_found(s, p, found, line_break); + if (r < 0) + return r; + + p += skip; + consumed += skip; + remaining -= skip; + } + + if (force_flush >= 0 && remaining > 0) { + r = stdout_stream_found(s, p, remaining, force_flush); + if (r < 0) + return r; + + consumed += remaining; + } + + if (ret_consumed) + *ret_consumed = consumed; + + return 0; +} + +static int stdout_stream_process(sd_event_source *es, int fd, uint32_t revents, void *userdata) { + CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred))) control; + size_t limit, consumed, allocated; + StdoutStream *s = ASSERT_PTR(userdata); + struct ucred *ucred; + struct iovec iovec; + ssize_t l; + char *p; + int r; + + struct msghdr msghdr = { + .msg_iov = &iovec, + .msg_iovlen = 1, + .msg_control = &control, + .msg_controllen = sizeof(control), + }; + + if ((revents|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) { + log_error("Got invalid event from epoll for stdout stream: %"PRIx32, revents); + goto terminate; + } + + /* If the buffer is almost full, add room for another 1K */ + allocated = MALLOC_ELEMENTSOF(s->buffer); + if (s->length + 512 >= allocated) { + if (!GREEDY_REALLOC(s->buffer, s->length + 1 + 1024)) { + log_oom(); + goto terminate; + } + + allocated = MALLOC_ELEMENTSOF(s->buffer); + } + + /* Try to make use of the allocated buffer in full, but never read more than the configured line size. Also, + * always leave room for a terminating NUL we might need to add. */ + limit = MIN(allocated - 1, MAX(s->server->line_max, STDOUT_STREAM_SETUP_PROTOCOL_LINE_MAX)); + assert(s->length <= limit); + iovec = IOVEC_MAKE(s->buffer + s->length, limit - s->length); + + l = recvmsg(s->fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); + if (l < 0) { + if (ERRNO_IS_TRANSIENT(errno)) + return 0; + + log_warning_errno(errno, "Failed to read from stream: %m"); + goto terminate; + } + cmsg_close_all(&msghdr); + + if (l == 0) { + (void) stdout_stream_scan(s, s->buffer, s->length, /* force_flush = */ LINE_BREAK_EOF, NULL); + goto terminate; + } + + /* Invalidate the context if the PID of the sender changed. This happens when a forked process + * inherits stdout/stderr from a parent. In this case getpeercred() returns the ucred of the parent, + * which can be invalid if the parent has exited in the meantime. */ + ucred = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_CREDENTIALS, struct ucred); + if (ucred && ucred->pid != s->ucred.pid) { + /* Force out any previously half-written lines from a different process, before we switch to + * the new ucred structure for everything we just added */ + r = stdout_stream_scan(s, s->buffer, s->length, /* force_flush = */ LINE_BREAK_PID_CHANGE, NULL); + if (r < 0) + goto terminate; + + s->context = client_context_release(s->server, s->context); + + p = s->buffer + s->length; + } else { + p = s->buffer; + l += s->length; + } + + /* Always copy in the new credentials */ + if (ucred) + s->ucred = *ucred; + + r = stdout_stream_scan(s, p, l, _LINE_BREAK_INVALID, &consumed); + if (r < 0) + goto terminate; + + /* Move what wasn't consumed to the front of the buffer */ + assert(consumed <= (size_t) l); + s->length = l - consumed; + memmove(s->buffer, p + consumed, s->length); + + return 1; + +terminate: + stdout_stream_destroy(s); + return 0; +} + +int stdout_stream_install(Server *s, int fd, StdoutStream **ret) { + _cleanup_(stdout_stream_freep) StdoutStream *stream = NULL; + sd_id128_t id; + int r; + + assert(s); + assert(fd >= 0); + + r = sd_id128_randomize(&id); + if (r < 0) + return log_error_errno(r, "Failed to generate stream ID: %m"); + + stream = new(StdoutStream, 1); + if (!stream) + return log_oom(); + + *stream = (StdoutStream) { + .fd = -1, + .priority = LOG_INFO, + .ucred = UCRED_INVALID, + }; + + xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id)); + + r = getpeercred(fd, &stream->ucred); + if (r < 0) + return log_error_errno(r, "Failed to determine peer credentials: %m"); + + r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true); + if (r < 0) + return log_error_errno(r, "SO_PASSCRED failed: %m"); + + if (mac_selinux_use()) { + r = getpeersec(fd, &stream->label); + if (r < 0 && r != -EOPNOTSUPP) + (void) log_warning_errno(r, "Failed to determine peer security context: %m"); + } + + (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++; + + (void) server_start_or_stop_idle_timer(s); /* Maybe no longer idle? */ + + if (ret) + *ret = stream; + + TAKE_PTR(stream); + 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 = ASSERT_PTR(userdata); + int r; + + if (revents != EPOLLIN) + return log_error_errno(SYNTHETIC_ERRNO(EIO), + "Got invalid event from epoll for stdout server fd: %" PRIx32, + revents); + + fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC); + if (fd < 0) { + if (ERRNO_IS_ACCEPT_AGAIN(errno)) + return 0; + + return log_error_errno(errno, "Failed to accept stdout connection: %m"); + } + + if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) { + struct ucred u = UCRED_INVALID; + + (void) getpeercred(fd, &u); + + /* By closing fd here we make sure that the client won't wait too long for journald to + * gather all the data it adds to the error message to find out that the connection has + * just been refused. + */ + fd = safe_close(fd); + + server_driver_message(s, u.pid, NULL, LOG_MESSAGE("Too many stdout streams, refusing connection."), NULL); + return 0; + } + + r = stdout_stream_install(s, fd, NULL); + if (r < 0) + return r; + + TAKE_FD(fd); + 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, + *stream_id = NULL; + int r; + + assert(stream); + assert(fname); + + if (!stream->state_file) { + stream->state_file = path_join(stream->server->runtime_directory, "streams", fname); + if (!stream->state_file) + return log_oom(); + } + + r = parse_env_file(NULL, stream->state_file, + "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, + "STREAM_ID", &stream_id); + if (r < 0) + return log_error_errno(r, "Failed to read: %s", stream->state_file); + + if (priority) { + int p; + + p = syslog_parse_priority_and_facility(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; + } + + if (stream_id) { + sd_id128_t id; + + r = sd_id128_from_string(stream_id, &id); + if (r >= 0) + xsprintf(stream->id_field, "_STREAM_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(id)); + } + + 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; +} + +int server_restore_streams(Server *s, FDSet *fds) { + _cleanup_closedir_ DIR *d = NULL; + const char *path; + int r; + + path = strjoina(s->runtime_directory, "/streams"); + d = opendir(path); + if (!d) { + if (errno == ENOENT) + return 0; + + return log_warning_errno(errno, "Failed to enumerate %s: %m", path); + } + + FOREACH_DIRENT(de, d, goto fail) { + unsigned long st_dev, st_ino; + bool found = false; + int fd; + + if (sscanf(de->d_name, "%lu:%lu", &st_dev, &st_ino) != 2) + continue; + + FDSET_FOREACH(fd, fds) { + 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); + if (unlinkat(dirfd(d), de->d_name, 0) < 0) + log_warning_errno(errno, "Failed to remove %s/%s: %m", path, de->d_name); + 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, const char *stdout_socket) { + int r; + + assert(s); + assert(stdout_socket); + + if (s->stdout_fd < 0) { + union sockaddr_union sa; + socklen_t sa_len; + + r = sockaddr_un_set_path(&sa.un, stdout_socket); + if (r < 0) + return log_error_errno(r, "Unable to use namespace path %s for AF_UNIX socket: %m", stdout_socket); + sa_len = r; + + 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"); + + (void) sockaddr_un_unlink(&sa.un); + + r = bind(s->stdout_fd, &sa.sa, sa_len); + if (r < 0) + return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path); + + (void) chmod(sa.un.sun_path, 0666); + + if (listen(s->stdout_fd, SOMAXCONN_DELUXE) < 0) + return log_error_errno(errno, "listen(%s) failed: %m", sa.un.sun_path); + } else + (void) fd_nonblock(s->stdout_fd, true); + + 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+5); + if (r < 0) + return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m"); + + return 0; +} + +void stdout_stream_send_notify(StdoutStream *s) { + struct iovec iovec = { + .iov_base = (char*) "FDSTORE=1", + .iov_len = STRLEN("FDSTORE=1"), + }; + struct msghdr msghdr = { + .msg_iov = &iovec, + .msg_iovlen = 1, + }; + struct cmsghdr *cmsg; + ssize_t l; + + assert(s); + assert(!s->fdstore); + assert(s->in_notify_queue); + assert(s->server); + assert(s->server->notify_fd >= 0); + + /* Store the connection fd in PID 1, so that we get it passed + * in again on next start */ + + msghdr.msg_controllen = CMSG_SPACE(sizeof(int)); + msghdr.msg_control = alloca0(msghdr.msg_controllen); + + cmsg = CMSG_FIRSTHDR(&msghdr); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + cmsg->cmsg_len = CMSG_LEN(sizeof(int)); + + memcpy(CMSG_DATA(cmsg), &s->fd, sizeof(int)); + + l = sendmsg(s->server->notify_fd, &msghdr, MSG_DONTWAIT|MSG_NOSIGNAL); + if (l < 0) { + if (errno == EAGAIN) + return; + + log_error_errno(errno, "Failed to send stream file descriptor to service manager: %m"); + } else { + log_debug("Successfully sent stream file descriptor to service manager."); + s->fdstore = 1; + } + + LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s); + s->in_notify_queue = false; + +} |