1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 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 <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <stddef.h>
#include "macro.h"
#include "util.h"
#include "mkdir.h"
#include "missing.h"
#include "selinux-util.h"
#include "socket-util.h"
int socket_address_listen(
const SocketAddress *a,
int flags,
int backlog,
SocketAddressBindIPv6Only only,
const char *bind_to_device,
bool free_bind,
bool transparent,
mode_t directory_mode,
mode_t socket_mode,
const char *label) {
_cleanup_close_ int fd = -1;
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 (socket_address_family(a) == AF_INET || socket_address_family(a) == 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 (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;
if (socket_address_family(a) == AF_UNIX && a->sockaddr.un.sun_path[0] != 0) {
mode_t old_mask;
/* Create parents */
mkdir_parents_label(a->sockaddr.un.sun_path, directory_mode);
/* Enforce the right access mode for the socket */
old_mask = umask(~ socket_mode);
/* Include the original umask in our mask */
umask(~socket_mode | old_mask);
r = mac_selinux_bind(fd, &a->sockaddr.sa, a->size);
if (r < 0 && errno == EADDRINUSE) {
/* Unlink and try again */
unlink(a->sockaddr.un.sun_path);
r = bind(fd, &a->sockaddr.sa, a->size);
}
umask(old_mask);
} else
r = bind(fd, &a->sockaddr.sa, a->size);
if (r < 0)
return -errno;
if (socket_address_can_accept(a))
if (listen(fd, backlog) < 0)
return -errno;
r = fd;
fd = -1;
return r;
}
int make_socket_fd(int log_level, const char* address, int flags) {
SocketAddress a;
int fd, r;
r = socket_address_parse(&a, address);
if (r < 0) {
log_error("Failed to parse socket address \"%s\": %s",
address, strerror(-r));
return r;
}
fd = socket_address_listen(&a, flags, SOMAXCONN, SOCKET_ADDRESS_DEFAULT,
NULL, 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;
}
|
