144 lines
4.4 KiB
C
144 lines
4.4 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <assert.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <net/if.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stddef.h>
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#include <sys/ioctl.h>
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#include "macro.h"
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#include "util.h"
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#include "mkdir.h"
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#include "socket-util.h"
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#include "missing.h"
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#include "label.h"
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int socket_address_listen(
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const SocketAddress *a,
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int backlog,
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SocketAddressBindIPv6Only only,
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const char *bind_to_device,
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bool free_bind,
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bool transparent,
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mode_t directory_mode,
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mode_t socket_mode,
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const char *label,
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int *ret) {
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int r, fd, one;
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assert(a);
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assert(ret);
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if ((r = socket_address_verify(a)) < 0)
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return r;
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if (socket_address_family(a) == AF_INET6 && !socket_ipv6_is_supported())
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return -EAFNOSUPPORT;
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r = label_socket_set(label);
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if (r < 0)
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return r;
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fd = socket(socket_address_family(a), a->type | SOCK_NONBLOCK | SOCK_CLOEXEC, a->protocol);
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r = fd < 0 ? -errno : 0;
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label_socket_clear();
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if (r < 0)
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return r;
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if (socket_address_family(a) == AF_INET6 && only != SOCKET_ADDRESS_DEFAULT) {
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int flag = only == SOCKET_ADDRESS_IPV6_ONLY;
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if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0)
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goto fail;
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}
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if (socket_address_family(a) == AF_INET || socket_address_family(a) == AF_INET6) {
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if (bind_to_device)
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if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0)
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goto fail;
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if (free_bind) {
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one = 1;
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if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &one, sizeof(one)) < 0)
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log_warning("IP_FREEBIND failed: %m");
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}
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if (transparent) {
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one = 1;
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if (setsockopt(fd, IPPROTO_IP, IP_TRANSPARENT, &one, sizeof(one)) < 0)
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log_warning("IP_TRANSPARENT failed: %m");
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}
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}
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one = 1;
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if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
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goto fail;
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if (socket_address_family(a) == AF_UNIX && a->sockaddr.un.sun_path[0] != 0) {
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mode_t old_mask;
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/* Create parents */
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mkdir_parents_label(a->sockaddr.un.sun_path, directory_mode);
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/* Enforce the right access mode for the socket*/
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old_mask = umask(~ socket_mode);
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/* Include the original umask in our mask */
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umask(~socket_mode | old_mask);
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r = label_bind(fd, &a->sockaddr.sa, a->size);
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if (r < 0 && errno == EADDRINUSE) {
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/* Unlink and try again */
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unlink(a->sockaddr.un.sun_path);
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r = bind(fd, &a->sockaddr.sa, a->size);
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}
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umask(old_mask);
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} else
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r = bind(fd, &a->sockaddr.sa, a->size);
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if (r < 0)
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goto fail;
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if (socket_address_can_accept(a))
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if (listen(fd, backlog) < 0)
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goto fail;
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*ret = fd;
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return 0;
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fail:
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r = -errno;
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close_nointr_nofail(fd);
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return r;
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}
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