#include <stddef.h>

#include <unistd.h>

#ifdef HAVE_SELINUX

#include <selinux/selinux.h>

#endif

#include "sd-daemon.h"

#include "sd-event.h"

#include "dirent-util.h"

#include "escape.h"

#include "fd-util.h"

#include "fileio.h"

#include "io-util.h"

#include "journald-console.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 "selinux-util.h"

#include "socket-util.h"

#include "string-util.h"

#include "syslog-util.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;

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;

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);

free(s->label);

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 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",

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 fail;

}

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 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;

}

/* Store the connection fd in PID 1, so that we get it passed

if (!s->fdstore) {

sd_pid_notify_with_fds(0, false, "FDSTORE=1", &s->fd, 1);

s->fdstore = true;

}

return 0;

fail:

(void) unlink(s->state_file);

if (temp_path)

(void) unlink(temp_path);

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) {

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;

size_t label_len;

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);

label_len = s->label ? strlen(s->label) : 0;

server_dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, s->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");

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 ++;

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;

}

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) {

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);

(void) 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");

return 0;

}