src/journal/journald-native.c - systemd-stable - Rivoreo Source Code Repositories

 /*-*- 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>
 #include <sys/epoll.h>

 #include "socket-util.h"
 #include "path-util.h"
 #include "selinux-util.h"
 #include "journald-server.h"
 #include "journald-native.h"
 #include "journald-kmsg.h"
 #include "journald-console.h"
 #include "journald-syslog.h"

 /* Make sure not to make this smaller than the maximum coredump
  * size. See COREDUMP_MAX in coredump.c */
 #define ENTRY_SIZE_MAX (1024*1024*768)
 #define DATA_SIZE_MAX (1024*1024*768)

 static bool valid_user_field(const char *p, size_t l) {
         const char *a;

         /* We kinda enforce POSIX syntax recommendations for
            environment variables here, but make a couple of additional
            requirements.

            http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */

         /* No empty field names */
         if (l <= 0)
                 return false;

         /* Don't allow names longer than 64 chars */
         if (l > 64)
                 return false;

         /* Variables starting with an underscore are protected */
         if (p[0] == '_')
                 return false;

         /* Don't allow digits as first character */
         if (p[0] >= '0' && p[0] <= '9')
                 return false;

         /* Only allow A-Z0-9 and '_' */
         for (a = p; a < p + l; a++)
                 if (!((*a >= 'A' && *a <= 'Z') ||
                       (*a >= '0' && *a <= '9') ||
                       *a == '_'))
                         return false;

         return true;
 }

 static bool allow_object_pid(struct ucred *ucred) {
         return ucred && ucred->uid == 0;
 }

 void server_process_native_message(
                 Server *s,
                 const void *buffer, size_t buffer_size,
                 struct ucred *ucred,
                 struct timeval *tv,
                 const char *label, size_t label_len) {

         struct iovec *iovec = NULL;
         unsigned n = 0, j, tn = (unsigned) -1;
         const char *p;
         size_t remaining, m = 0;
         int priority = LOG_INFO;
         char *identifier = NULL, *message = NULL;
         pid_t object_pid = 0;

         assert(s);
         assert(buffer || buffer_size == 0);

         p = buffer;
         remaining = buffer_size;

         while (remaining > 0) {
                 const char *e, *q;

                 e = memchr(p, '\n', remaining);

                 if (!e) {
                         /* Trailing noise, let's ignore it, and flush what we collected */
                         log_debug("Received message with trailing noise, ignoring.");
                         break;
                 }

                 if (e == p) {
                         /* Entry separator */
                         server_dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority, object_pid);
                         n = 0;
                         priority = LOG_INFO;

                         p++;
                         remaining--;
                         continue;
                 }

                 if (*p == '.' || *p == '#') {
                         /* Ignore control commands for now, and
                          * comments too. */
                         remaining -= (e - p) + 1;
                         p = e + 1;
                         continue;
                 }

                 /* A property follows */

                 /* n received properties, +1 for _TRANSPORT */
                 if (!GREEDY_REALLOC(iovec, m, n + 1 + N_IOVEC_META_FIELDS +
                                               !!object_pid * N_IOVEC_OBJECT_FIELDS)) {
                         log_oom();
                         break;
                 }

                 q = memchr(p, '=', e - p);
                 if (q) {
                         if (valid_user_field(p, q - p)) {
                                 size_t l;

                                 l = e - p;

                                 /* If the field name starts with an
                                  * underscore, skip the variable,
                                  * since that indidates a trusted
                                  * field */
                                 iovec[n].iov_base = (char*) p;
                                 iovec[n].iov_len = l;
                                 n++;

                                 /* We need to determine the priority
                                  * of this entry for the rate limiting
                                  * logic */
                                 if (l == 10 &&
                                     startswith(p, "PRIORITY=") &&
                                     p[9] >= '0' && p[9] <= '9')
                                         priority = (priority & LOG_FACMASK) | (p[9] - '0');

                                 else if (l == 17 &&
                                          startswith(p, "SYSLOG_FACILITY=") &&
                                          p[16] >= '0' && p[16] <= '9')
                                         priority = (priority & LOG_PRIMASK) | ((p[16] - '0') << 3);

                                 else if (l == 18 &&
                                          startswith(p, "SYSLOG_FACILITY=") &&
                                          p[16] >= '0' && p[16] <= '9' &&
                                          p[17] >= '0' && p[17] <= '9')
                                         priority = (priority & LOG_PRIMASK) | (((p[16] - '0')*10 + (p[17] - '0')) << 3);

                                 else if (l >= 19 &&
                                          startswith(p, "SYSLOG_IDENTIFIER=")) {
                                         char *t;

                                         t = strndup(p + 18, l - 18);
                                         if (t) {
                                                 free(identifier);
                                                 identifier = t;
                                         }
                                 } else if (l >= 8 &&
                                            startswith(p, "MESSAGE=")) {
                                         char *t;

                                         t = strndup(p + 8, l - 8);
                                         if (t) {
                                                 free(message);
                                                 message = t;
                                         }
                                 } else if (l > strlen("OBJECT_PID=") &&
                                            l < strlen("OBJECT_PID=")  + DECIMAL_STR_MAX(pid_t) &&
                                            startswith(p, "OBJECT_PID=") &&
                                            allow_object_pid(ucred)) {
                                         char buf[DECIMAL_STR_MAX(pid_t)];
                                         memcpy(buf, p + strlen("OBJECT_PID="), l - strlen("OBJECT_PID="));
                                         char_array_0(buf);

                                         /* ignore error */
                                         parse_pid(buf, &object_pid);
                                 }
                         }

                         remaining -= (e - p) + 1;
                         p = e + 1;
                         continue;
                 } else {
                         le64_t l_le;
                         uint64_t l;
                         char *k;

                         if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
                                 log_debug("Failed to parse message, ignoring.");
                                 break;
                         }

                         memcpy(&l_le, e + 1, sizeof(uint64_t));
                         l = le64toh(l_le);

                         if (l > DATA_SIZE_MAX) {
                                 log_debug("Received binary data block too large, ignoring.");
                                 break;
                         }

                         if ((uint64_t) remaining < e - p + 1 + sizeof(uint64_t) + l + 1 ||
                             e[1+sizeof(uint64_t)+l] != '\n') {
                                 log_debug("Failed to parse message, ignoring.");
                                 break;
                         }

                         k = malloc((e - p) + 1 + l);
                         if (!k) {
                                 log_oom();
                                 break;
                         }

                         memcpy(k, p, e - p);
                         k[e - p] = '=';
                         memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);

                         if (valid_user_field(p, e - p)) {
                                 iovec[n].iov_base = k;
                                 iovec[n].iov_len = (e - p) + 1 + l;
                                 n++;
                         } else
                                 free(k);

                         remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
                         p = e + 1 + sizeof(uint64_t) + l + 1;
                 }
         }

         if (n <= 0)
                 goto finish;

         tn = n++;
         IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal");

         if (message) {
                 if (s->forward_to_syslog)
                         server_forward_syslog(s, priority, identifier, message, ucred, tv);

                 if (s->forward_to_kmsg)
                         server_forward_kmsg(s, priority, identifier, message, ucred);

                 if (s->forward_to_console)
                         server_forward_console(s, priority, identifier, message, ucred);
         }

         server_dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority, object_pid);

 finish:
         for (j = 0; j < n; j++)  {
                 if (j == tn)
                         continue;

                 if (iovec[j].iov_base < buffer ||
                     (const uint8_t*) iovec[j].iov_base >= (const uint8_t*) buffer + buffer_size)
                         free(iovec[j].iov_base);
         }

         free(iovec);
         free(identifier);
         free(message);
 }

 void server_process_native_file(
                 Server *s,
                 int fd,
                 struct ucred *ucred,
                 struct timeval *tv,
                 const char *label, size_t label_len) {

         struct stat st;
         _cleanup_free_ void *p = NULL;
         ssize_t n;
         int r;

         assert(s);
         assert(fd >= 0);

         if (!ucred || ucred->uid != 0) {
                 _cleanup_free_ char *sl = NULL, *k = NULL;
                 const char *e;

                 if (asprintf(&sl, "/proc/self/fd/%i", fd) < 0) {
                         log_oom();
                         return;
                 }

                 r = readlink_malloc(sl, &k);
                 if (r < 0) {
                         log_error("readlink(%s) failed: %m", sl);
                         return;
                 }

                 e = path_startswith(k, "/dev/shm/");
                 if (!e)
                         e = path_startswith(k, "/tmp/");
                 if (!e)
                         e = path_startswith(k, "/var/tmp/");
                 if (!e) {
                         log_error("Received file outside of allowed directories. Refusing.");
                         return;
                 }

                 if (!filename_is_safe(e)) {
                         log_error("Received file in subdirectory of allowed directories. Refusing.");
                         return;
                 }
         }

         /* Data is in the passed file, since it didn't fit in a
          * datagram. We can't map the file here, since clients might
          * then truncate it and trigger a SIGBUS for us. So let's
          * stupidly read it */

         if (fstat(fd, &st) < 0) {
                 log_error("Failed to stat passed file, ignoring: %m");
                 return;
         }

         if (!S_ISREG(st.st_mode)) {
                 log_error("File passed is not regular. Ignoring.");
                 return;
         }

         if (st.st_size <= 0)
                 return;

         if (st.st_size > ENTRY_SIZE_MAX) {
                 log_error("File passed too large. Ignoring.");
                 return;
         }

         p = malloc(st.st_size);
         if (!p) {
                 log_oom();
                 return;
         }

         n = pread(fd, p, st.st_size, 0);
         if (n < 0)
                 log_error("Failed to read file, ignoring: %s", strerror(-n));
         else if (n > 0)
                 server_process_native_message(s, p, n, ucred, tv, label, label_len);
 }

 int server_open_native_socket(Server*s) {
         union sockaddr_union sa;
         int one, r;

         assert(s);

         if (s->native_fd < 0) {

                 s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
                 if (s->native_fd < 0) {
                         log_error("socket() failed: %m");
                         return -errno;
                 }

                 zero(sa);
                 sa.un.sun_family = AF_UNIX;
                 strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path));

                 unlink(sa.un.sun_path);

                 r = bind(s->native_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);
         } else
                 fd_nonblock(s->native_fd, 1);

         one = 1;
         r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
         if (r < 0) {
                 log_error("SO_PASSCRED failed: %m");
                 return -errno;
         }

 #ifdef HAVE_SELINUX
         if (use_selinux()) {
                 one = 1;
                 r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
                 if (r < 0)
                         log_warning("SO_PASSSEC failed: %m");
         }
 #endif

         one = 1;
         r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
         if (r < 0) {
                 log_error("SO_TIMESTAMP failed: %m");
                 return -errno;
         }

         r = sd_event_add_io(s->event, &s->native_event_source, s->native_fd, EPOLLIN, process_datagram, s);
         if (r < 0) {
                 log_error("Failed to add native server fd to event loop: %s", strerror(-r));
                 return r;
         }

         return 0;
 }
	/-- 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>
	#include <sys/epoll.h>

	#include "socket-util.h"
	#include "path-util.h"
	#include "selinux-util.h"
	#include "journald-server.h"
	#include "journald-native.h"
	#include "journald-kmsg.h"
	#include "journald-console.h"
	#include "journald-syslog.h"

	/* Make sure not to make this smaller than the maximum coredump
	* size. See COREDUMP_MAX in coredump.c */
	#define ENTRY_SIZE_MAX (10241024768)
	#define DATA_SIZE_MAX (10241024768)

	static bool valid_user_field(const char *p, size_t l) {
	const char *a;

	/* We kinda enforce POSIX syntax recommendations for
	environment variables here, but make a couple of additional
	requirements.

	http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html */

	/* No empty field names */
	if (l <= 0)
	return false;

	/* Don't allow names longer than 64 chars */
	if (l > 64)
	return false;

	/* Variables starting with an underscore are protected */
	if (p[0] == '_')
	return false;

	/* Don't allow digits as first character */
	if (p[0] >= '0' && p[0] <= '9')
	return false;

	/* Only allow A-Z0-9 and '_' */
	for (a = p; a < p + l; a++)
	if (!((a >= 'A' && a <= 'Z') \|\|
	(a >= '0' && a <= '9') \|\|
	*a == '_'))
	return false;

	return true;
	}

	static bool allow_object_pid(struct ucred *ucred) {
	return ucred && ucred->uid == 0;
	}

	void server_process_native_message(
	Server *s,
	const void *buffer, size_t buffer_size,
	struct ucred *ucred,
	struct timeval *tv,
	const char *label, size_t label_len) {

	struct iovec *iovec = NULL;
	unsigned n = 0, j, tn = (unsigned) -1;
	const char *p;
	size_t remaining, m = 0;
	int priority = LOG_INFO;
	char identifier = NULL, message = NULL;
	pid_t object_pid = 0;

	assert(s);
	assert(buffer \|\| buffer_size == 0);

	p = buffer;
	remaining = buffer_size;

	while (remaining > 0) {
	const char e, q;

	e = memchr(p, '\n', remaining);

	if (!e) {
	/* Trailing noise, let's ignore it, and flush what we collected */
	log_debug("Received message with trailing noise, ignoring.");
	break;
	}

	if (e == p) {
	/* Entry separator */
	server_dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority, object_pid);
	n = 0;
	priority = LOG_INFO;

	p++;
	remaining--;
	continue;
	}

	if (p == '.' \|\| p == '#') {
	/* Ignore control commands for now, and
	* comments too. */
	remaining -= (e - p) + 1;
	p = e + 1;
	continue;
	}

	/* A property follows */

	/* n received properties, +1 for _TRANSPORT */
	if (!GREEDY_REALLOC(iovec, m, n + 1 + N_IOVEC_META_FIELDS +
	!!object_pid * N_IOVEC_OBJECT_FIELDS)) {
	log_oom();
	break;
	}

	q = memchr(p, '=', e - p);
	if (q) {
	if (valid_user_field(p, q - p)) {
	size_t l;

	l = e - p;

	/* If the field name starts with an
	* underscore, skip the variable,
	* since that indidates a trusted
	* field */
	iovec[n].iov_base = (char*) p;
	iovec[n].iov_len = l;
	n++;

	/* We need to determine the priority
	* of this entry for the rate limiting
	* logic */
	if (l == 10 &&
	startswith(p, "PRIORITY=") &&
	p[9] >= '0' && p[9] <= '9')
	priority = (priority & LOG_FACMASK) \| (p[9] - '0');

	else if (l == 17 &&
	startswith(p, "SYSLOG_FACILITY=") &&
	p[16] >= '0' && p[16] <= '9')
	priority = (priority & LOG_PRIMASK) \| ((p[16] - '0') << 3);

	else if (l == 18 &&
	startswith(p, "SYSLOG_FACILITY=") &&
	p[16] >= '0' && p[16] <= '9' &&
	p[17] >= '0' && p[17] <= '9')
	priority = (priority & LOG_PRIMASK) \| (((p[16] - '0')*10 + (p[17] - '0')) << 3);

	else if (l >= 19 &&
	startswith(p, "SYSLOG_IDENTIFIER=")) {
	char *t;

	t = strndup(p + 18, l - 18);
	if (t) {
	free(identifier);
	identifier = t;
	}
	} else if (l >= 8 &&
	startswith(p, "MESSAGE=")) {
	char *t;

	t = strndup(p + 8, l - 8);
	if (t) {
	free(message);
	message = t;
	}
	} else if (l > strlen("OBJECT_PID=") &&
	l < strlen("OBJECT_PID=") + DECIMAL_STR_MAX(pid_t) &&
	startswith(p, "OBJECT_PID=") &&
	allow_object_pid(ucred)) {
	char buf[DECIMAL_STR_MAX(pid_t)];
	memcpy(buf, p + strlen("OBJECT_PID="), l - strlen("OBJECT_PID="));
	char_array_0(buf);

	/* ignore error */
	parse_pid(buf, &object_pid);
	}
	}

	remaining -= (e - p) + 1;
	p = e + 1;
	continue;
	} else {
	le64_t l_le;
	uint64_t l;
	char *k;

	if (remaining < e - p + 1 + sizeof(uint64_t) + 1) {
	log_debug("Failed to parse message, ignoring.");
	break;
	}

	memcpy(&l_le, e + 1, sizeof(uint64_t));
	l = le64toh(l_le);

	if (l > DATA_SIZE_MAX) {
	log_debug("Received binary data block too large, ignoring.");
	break;
	}

	if ((uint64_t) remaining < e - p + 1 + sizeof(uint64_t) + l + 1 \|\|
	e[1+sizeof(uint64_t)+l] != '\n') {
	log_debug("Failed to parse message, ignoring.");
	break;
	}

	k = malloc((e - p) + 1 + l);
	if (!k) {
	log_oom();
	break;
	}

	memcpy(k, p, e - p);
	k[e - p] = '=';
	memcpy(k + (e - p) + 1, e + 1 + sizeof(uint64_t), l);

	if (valid_user_field(p, e - p)) {
	iovec[n].iov_base = k;
	iovec[n].iov_len = (e - p) + 1 + l;
	n++;
	} else
	free(k);

	remaining -= (e - p) + 1 + sizeof(uint64_t) + l + 1;
	p = e + 1 + sizeof(uint64_t) + l + 1;
	}
	}

	if (n <= 0)
	goto finish;

	tn = n++;
	IOVEC_SET_STRING(iovec[tn], "_TRANSPORT=journal");

	if (message) {
	if (s->forward_to_syslog)
	server_forward_syslog(s, priority, identifier, message, ucred, tv);

	if (s->forward_to_kmsg)
	server_forward_kmsg(s, priority, identifier, message, ucred);

	if (s->forward_to_console)
	server_forward_console(s, priority, identifier, message, ucred);
	}

	server_dispatch_message(s, iovec, n, m, ucred, tv, label, label_len, NULL, priority, object_pid);

	finish:
	for (j = 0; j < n; j++) {
	if (j == tn)
	continue;

	if (iovec[j].iov_base < buffer \|\|
	(const uint8_t) iovec[j].iov_base >= (const uint8_t) buffer + buffer_size)
	free(iovec[j].iov_base);
	}

	free(iovec);
	free(identifier);
	free(message);
	}

	void server_process_native_file(
	Server *s,
	int fd,
	struct ucred *ucred,
	struct timeval *tv,
	const char *label, size_t label_len) {

	struct stat st;
	_cleanup_free_ void *p = NULL;
	ssize_t n;
	int r;

	assert(s);
	assert(fd >= 0);

	if (!ucred \|\| ucred->uid != 0) {
	_cleanup_free_ char sl = NULL, k = NULL;
	const char *e;

	if (asprintf(&sl, "/proc/self/fd/%i", fd) < 0) {
	log_oom();
	return;
	}

	r = readlink_malloc(sl, &k);
	if (r < 0) {
	log_error("readlink(%s) failed: %m", sl);
	return;
	}

	e = path_startswith(k, "/dev/shm/");
	if (!e)
	e = path_startswith(k, "/tmp/");
	if (!e)
	e = path_startswith(k, "/var/tmp/");
	if (!e) {
	log_error("Received file outside of allowed directories. Refusing.");
	return;
	}

	if (!filename_is_safe(e)) {
	log_error("Received file in subdirectory of allowed directories. Refusing.");
	return;
	}
	}

	/* Data is in the passed file, since it didn't fit in a
	* datagram. We can't map the file here, since clients might
	* then truncate it and trigger a SIGBUS for us. So let's
	* stupidly read it */

	if (fstat(fd, &st) < 0) {
	log_error("Failed to stat passed file, ignoring: %m");
	return;
	}

	if (!S_ISREG(st.st_mode)) {
	log_error("File passed is not regular. Ignoring.");
	return;
	}

	if (st.st_size <= 0)
	return;

	if (st.st_size > ENTRY_SIZE_MAX) {
	log_error("File passed too large. Ignoring.");
	return;
	}

	p = malloc(st.st_size);
	if (!p) {
	log_oom();
	return;
	}

	n = pread(fd, p, st.st_size, 0);
	if (n < 0)
	log_error("Failed to read file, ignoring: %s", strerror(-n));
	else if (n > 0)
	server_process_native_message(s, p, n, ucred, tv, label, label_len);
	}

	int server_open_native_socket(Server*s) {
	union sockaddr_union sa;
	int one, r;

	assert(s);

	if (s->native_fd < 0) {

	s->native_fd = socket(AF_UNIX, SOCK_DGRAM\|SOCK_CLOEXEC\|SOCK_NONBLOCK, 0);
	if (s->native_fd < 0) {
	log_error("socket() failed: %m");
	return -errno;
	}

	zero(sa);
	sa.un.sun_family = AF_UNIX;
	strncpy(sa.un.sun_path, "/run/systemd/journal/socket", sizeof(sa.un.sun_path));

	unlink(sa.un.sun_path);

	r = bind(s->native_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);
	} else
	fd_nonblock(s->native_fd, 1);

	one = 1;
	r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
	if (r < 0) {
	log_error("SO_PASSCRED failed: %m");
	return -errno;
	}

	#ifdef HAVE_SELINUX
	if (use_selinux()) {
	one = 1;
	r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
	if (r < 0)
	log_warning("SO_PASSSEC failed: %m");
	}
	#endif

	one = 1;
	r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
	if (r < 0) {
	log_error("SO_TIMESTAMP failed: %m");
	return -errno;
	}

	r = sd_event_add_io(s->event, &s->native_event_source, s->native_fd, EPOLLIN, process_datagram, s);
	if (r < 0) {
	log_error("Failed to add native server fd to event loop: %s", strerror(-r));
	return r;
	}

	return 0;
	}