#include <fcntl.h>

#include <unistd.h>

#include <stddef.h>

#ifdef HAVE_SELINUX

#include <selinux/selinux.h>

#endif

#include "sd-event.h"

#include "socket-util.h"

#include "selinux-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;

sd_event_source *event_source;

LIST_FIELDS(StdoutStream, stdout_stream);

};

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=") + DECIMAL_STR_MAX(priority)];

_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);

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) {

snprintf(syslog_facility, sizeof(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;

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("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_free(s);

return 0;

}

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(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);

}

if (s->fd >= 0)

close_nointr_nofail(s->fd);

#ifdef HAVE_SELINUX

if (s->security_context)

freecon(s->security_context);

#endif

free(s->identifier);

free(s->unit_id);

free(s);

}

static int stdout_stream_new(sd_event_source *es, int listen_fd, uint32_t revents, void *userdata) {

Server *s = userdata;

StdoutStream *stream;

int fd, 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("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;

r = getpeercred(fd, &stream->ucred);

if (r < 0) {

log_error("Failed to determine peer credentials: %m");

goto fail;

}

#ifdef HAVE_SELINUX

if (use_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");

goto fail;

}

r = sd_event_add_io(s->event, fd, EPOLLIN, stdout_stream_process, stream, &stream->event_source);

if (r < 0) {

log_error("Failed to add stream to event loop: %s", strerror(-r));

goto fail;

}

r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5);

if (r < 0) {

log_error("Failed to adjust stdout event source priority: %s", strerror(-r));

goto fail;

}

stream->server = s;

LIST_PREPEND(stdout_stream, s->stdout_streams, stream);

s->n_stdout_streams ++;

return 0;

fail:

stdout_stream_free(stream);

return 0;

}

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) {

log_error("socket() failed: %m");

return -errno;

}

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("listen() failed: %m");

return -errno;

}

} else

fd_nonblock(s->stdout_fd, 1);

r = sd_event_add_io(s->event, s->stdout_fd, EPOLLIN, stdout_stream_new, s, &s->stdout_event_source);

if (r < 0) {

log_error("Failed to add stdout server fd to event source: %s", strerror(-r));

return r;

}

r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+10);

if (r < 0) {

log_error("Failed to adjust priority of stdout server event source: %s", strerror(-r));

return r;

}

return 0;

}