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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
***/
#include <errno.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <stddef.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include "alloc-util.h"
#include "fd-util.h"
#include "fs-util.h"
#include "log.h"
#include "macro.h"
#include "missing.h"
#include "mkdir.h"
#include "selinux-util.h"
#include "socket-util.h"
#include "umask-util.h"
int socket_address_listen(
const SocketAddress *a,
int flags,
int backlog,
SocketAddressBindIPv6Only only,
const char *bind_to_device,
bool reuse_port,
bool free_bind,
bool transparent,
mode_t directory_mode,
mode_t socket_mode,
const char *label) {
_cleanup_close_ int fd = -1;
const char *p;
int r, one;
assert(a);
r = socket_address_verify(a);
if (r < 0)
return r;
if (socket_address_family(a) == AF_INET6 && !socket_ipv6_is_supported())
return -EAFNOSUPPORT;
if (label) {
r = mac_selinux_create_socket_prepare(label);
if (r < 0)
return r;
}
fd = socket(socket_address_family(a), a->type | flags, a->protocol);
r = fd < 0 ? -errno : 0;
if (label)
mac_selinux_create_socket_clear();
if (r < 0)
return r;
if (socket_address_family(a) == AF_INET6 && only != SOCKET_ADDRESS_DEFAULT) {
int flag = only == SOCKET_ADDRESS_IPV6_ONLY;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0)
return -errno;
}
if (IN_SET(socket_address_family(a), AF_INET, AF_INET6)) {
if (bind_to_device)
if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0)
return -errno;
if (reuse_port) {
one = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &one, sizeof(one)) < 0)
log_warning_errno(errno, "SO_REUSEPORT failed: %m");
}
if (free_bind) {
one = 1;
if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &one, sizeof(one)) < 0)
log_warning_errno(errno, "IP_FREEBIND failed: %m");
}
if (transparent) {
one = 1;
if (setsockopt(fd, IPPROTO_IP, IP_TRANSPARENT, &one, sizeof(one)) < 0)
log_warning_errno(errno, "IP_TRANSPARENT failed: %m");
}
}
one = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0)
return -errno;
p = socket_address_get_path(a);
if (p) {
/* Create parents */
(void) mkdir_parents_label(p, directory_mode);
/* Enforce the right access mode for the socket */
RUN_WITH_UMASK(~socket_mode) {
r = mac_selinux_bind(fd, &a->sockaddr.sa, a->size);
if (r == -EADDRINUSE) {
/* Unlink and try again */
if (unlink(p) < 0)
return r; /* didn't work, return original error */
r = mac_selinux_bind(fd, &a->sockaddr.sa, a->size);
}
if (r < 0)
return r;
}
} else {
if (bind(fd, &a->sockaddr.sa, a->size) < 0)
return -errno;
}
if (socket_address_can_accept(a))
if (listen(fd, backlog) < 0)
return -errno;
/* Let's trigger an inotify event on the socket node, so that anyone waiting for this socket to be connectable
* gets notified */
if (p)
(void) touch(p);
r = fd;
fd = -1;
return r;
}
int make_socket_fd(int log_level, const char* address, int type, int flags) {
SocketAddress a;
int fd, r;
r = socket_address_parse(&a, address);
if (r < 0)
return log_error_errno(r, "Failed to parse socket address \"%s\": %m", address);
a.type = type;
fd = socket_address_listen(&a, type | flags, SOMAXCONN, SOCKET_ADDRESS_DEFAULT,
NULL, false, false, false, 0755, 0644, NULL);
if (fd < 0 || log_get_max_level() >= log_level) {
_cleanup_free_ char *p = NULL;
r = socket_address_print(&a, &p);
if (r < 0)
return log_error_errno(r, "socket_address_print(): %m");
if (fd < 0)
log_error_errno(fd, "Failed to listen on %s: %m", p);
else
log_full(log_level, "Listening on %s", p);
}
return fd;
}
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