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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
cc527a47 KS |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
cc527a47 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
cc527a47 KS |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <assert.h> | |
23 | #include <string.h> | |
24 | #include <unistd.h> | |
25 | #include <errno.h> | |
26 | #include <stdlib.h> | |
27 | #include <arpa/inet.h> | |
28 | #include <stdio.h> | |
29 | #include <net/if.h> | |
30 | #include <sys/types.h> | |
31 | #include <sys/stat.h> | |
32 | #include <stddef.h> | |
33 | #include <sys/ioctl.h> | |
34 | ||
35 | #include "macro.h" | |
36 | #include "util.h" | |
37 | #include "mkdir.h" | |
38 | #include "socket-util.h" | |
39 | #include "missing.h" | |
40 | #include "label.h" | |
41 | ||
42 | int socket_address_listen( | |
43 | const SocketAddress *a, | |
175a3d25 | 44 | int flags, |
cc527a47 KS |
45 | int backlog, |
46 | SocketAddressBindIPv6Only only, | |
47 | const char *bind_to_device, | |
48 | bool free_bind, | |
49 | bool transparent, | |
50 | mode_t directory_mode, | |
51 | mode_t socket_mode, | |
175a3d25 LP |
52 | const char *label) { |
53 | ||
54 | _cleanup_close_ int fd = -1; | |
55 | int r, one; | |
cc527a47 | 56 | |
cc527a47 | 57 | assert(a); |
cc527a47 | 58 | |
175a3d25 LP |
59 | r = socket_address_verify(a); |
60 | if (r < 0) | |
cc527a47 KS |
61 | return r; |
62 | ||
63 | if (socket_address_family(a) == AF_INET6 && !socket_ipv6_is_supported()) | |
64 | return -EAFNOSUPPORT; | |
65 | ||
175a3d25 | 66 | if (label) { |
ecabcf8b | 67 | r = mac_selinux_create_socket_prepare(label); |
175a3d25 LP |
68 | if (r < 0) |
69 | return r; | |
70 | } | |
cc527a47 | 71 | |
175a3d25 | 72 | fd = socket(socket_address_family(a), a->type | flags, a->protocol); |
cc527a47 KS |
73 | r = fd < 0 ? -errno : 0; |
74 | ||
175a3d25 | 75 | if (label) |
ecabcf8b | 76 | mac_selinux_create_socket_clear(); |
cc527a47 KS |
77 | |
78 | if (r < 0) | |
79 | return r; | |
80 | ||
81 | if (socket_address_family(a) == AF_INET6 && only != SOCKET_ADDRESS_DEFAULT) { | |
82 | int flag = only == SOCKET_ADDRESS_IPV6_ONLY; | |
83 | ||
84 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0) | |
175a3d25 | 85 | return -errno; |
cc527a47 KS |
86 | } |
87 | ||
88 | if (socket_address_family(a) == AF_INET || socket_address_family(a) == AF_INET6) { | |
89 | if (bind_to_device) | |
90 | if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, bind_to_device, strlen(bind_to_device)+1) < 0) | |
175a3d25 | 91 | return -errno; |
cc527a47 KS |
92 | |
93 | if (free_bind) { | |
94 | one = 1; | |
95 | if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &one, sizeof(one)) < 0) | |
96 | log_warning("IP_FREEBIND failed: %m"); | |
97 | } | |
98 | ||
99 | if (transparent) { | |
100 | one = 1; | |
101 | if (setsockopt(fd, IPPROTO_IP, IP_TRANSPARENT, &one, sizeof(one)) < 0) | |
102 | log_warning("IP_TRANSPARENT failed: %m"); | |
103 | } | |
104 | } | |
105 | ||
106 | one = 1; | |
107 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0) | |
175a3d25 | 108 | return -errno; |
cc527a47 KS |
109 | |
110 | if (socket_address_family(a) == AF_UNIX && a->sockaddr.un.sun_path[0] != 0) { | |
111 | mode_t old_mask; | |
112 | ||
113 | /* Create parents */ | |
d2e54fae | 114 | mkdir_parents_label(a->sockaddr.un.sun_path, directory_mode); |
cc527a47 | 115 | |
175a3d25 | 116 | /* Enforce the right access mode for the socket */ |
cc527a47 KS |
117 | old_mask = umask(~ socket_mode); |
118 | ||
119 | /* Include the original umask in our mask */ | |
120 | umask(~socket_mode | old_mask); | |
121 | ||
cc56fafe | 122 | r = mac_selinux_bind(fd, &a->sockaddr.sa, a->size); |
cc527a47 KS |
123 | |
124 | if (r < 0 && errno == EADDRINUSE) { | |
125 | /* Unlink and try again */ | |
126 | unlink(a->sockaddr.un.sun_path); | |
127 | r = bind(fd, &a->sockaddr.sa, a->size); | |
128 | } | |
129 | ||
130 | umask(old_mask); | |
131 | } else | |
132 | r = bind(fd, &a->sockaddr.sa, a->size); | |
133 | ||
134 | if (r < 0) | |
175a3d25 | 135 | return -errno; |
cc527a47 KS |
136 | |
137 | if (socket_address_can_accept(a)) | |
138 | if (listen(fd, backlog) < 0) | |
175a3d25 | 139 | return -errno; |
cc527a47 | 140 | |
175a3d25 LP |
141 | r = fd; |
142 | fd = -1; | |
cc527a47 | 143 | |
cc527a47 KS |
144 | return r; |
145 | } | |
e0aa3726 ZJS |
146 | |
147 | int make_socket_fd(int log_level, const char* address, int flags) { | |
148 | SocketAddress a; | |
149 | int fd, r; | |
150 | ||
151 | r = socket_address_parse(&a, address); | |
152 | if (r < 0) { | |
1af719ed ZJS |
153 | log_error("Failed to parse socket address \"%s\": %s", |
154 | address, strerror(-r)); | |
e0aa3726 ZJS |
155 | return r; |
156 | } | |
157 | ||
158 | fd = socket_address_listen(&a, flags, SOMAXCONN, SOCKET_ADDRESS_DEFAULT, | |
159 | NULL, false, false, 0755, 0644, NULL); | |
160 | if (fd < 0 || log_get_max_level() >= log_level) { | |
c8b32e11 | 161 | _cleanup_free_ char *p = NULL; |
e0aa3726 ZJS |
162 | |
163 | r = socket_address_print(&a, &p); | |
164 | if (r < 0) { | |
0a1beeb6 | 165 | log_error_errno(-r, "socket_address_print(): %m"); |
e0aa3726 ZJS |
166 | return r; |
167 | } | |
168 | ||
169 | if (fd < 0) | |
0a1beeb6 | 170 | log_error_errno(-fd, "Failed to listen on %s: %m", p); |
e0aa3726 ZJS |
171 | else |
172 | log_full(log_level, "Listening on %s", p); | |
173 | } | |
174 | ||
175 | return fd; | |
176 | } |