]>
git.proxmox.com Git - mirror_lxc.git/blob - src/lxc/af_unix.c
2 * lxc: linux Container library
4 * (C) Copyright IBM Corp. 2007, 2008
7 * Daniel Lezcano <daniel.lezcano at free.fr>
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
32 #include <sys/socket.h>
33 #include <sys/syscall.h>
40 #include "include/strlcpy.h"
43 lxc_log_define(af_unix
, lxc
);
45 int lxc_abstract_unix_open(const char *path
, int type
, int flags
)
49 struct sockaddr_un addr
;
51 fd
= socket(PF_UNIX
, type
, 0);
55 /* Clear address structure */
56 memset(&addr
, 0, sizeof(addr
));
61 addr
.sun_family
= AF_UNIX
;
63 len
= strlen(&path
[1]);
64 /* do not enforce \0-termination */
65 if (len
>= sizeof(addr
.sun_path
)) {
71 /* do not enforce \0-termination */
72 memcpy(&addr
.sun_path
[1], &path
[1], len
);
74 ret
= bind(fd
, (struct sockaddr
*)&addr
,
75 offsetof(struct sockaddr_un
, sun_path
) + len
+ 1);
83 if (type
== SOCK_STREAM
) {
84 ret
= listen(fd
, 100);
97 int lxc_abstract_unix_close(int fd
)
103 int lxc_abstract_unix_connect(const char *path
)
107 struct sockaddr_un addr
;
109 fd
= socket(PF_UNIX
, SOCK_STREAM
, 0);
113 memset(&addr
, 0, sizeof(addr
));
115 addr
.sun_family
= AF_UNIX
;
117 len
= strlen(&path
[1]);
118 /* do not enforce \0-termination */
119 if (len
>= sizeof(addr
.sun_path
)) {
121 errno
= ENAMETOOLONG
;
125 /* do not enforce \0-termination */
126 memcpy(&addr
.sun_path
[1], &path
[1], len
);
128 ret
= connect(fd
, (struct sockaddr
*)&addr
,
129 offsetof(struct sockaddr_un
, sun_path
) + len
+ 1);
138 int lxc_abstract_unix_send_fds(int fd
, int *sendfds
, int num_sendfds
,
139 void *data
, size_t size
)
144 struct cmsghdr
*cmsg
= NULL
;
147 size_t cmsgbufsize
= CMSG_SPACE(num_sendfds
* sizeof(int));
149 memset(&msg
, 0, sizeof(msg
));
150 memset(&iov
, 0, sizeof(iov
));
152 cmsgbuf
= malloc(cmsgbufsize
);
156 msg
.msg_control
= cmsgbuf
;
157 msg
.msg_controllen
= cmsgbufsize
;
159 cmsg
= CMSG_FIRSTHDR(&msg
);
160 cmsg
->cmsg_level
= SOL_SOCKET
;
161 cmsg
->cmsg_type
= SCM_RIGHTS
;
162 cmsg
->cmsg_len
= CMSG_LEN(num_sendfds
* sizeof(int));
164 msg
.msg_controllen
= cmsg
->cmsg_len
;
166 memcpy(CMSG_DATA(cmsg
), sendfds
, num_sendfds
* sizeof(int));
168 iov
.iov_base
= data
? data
: buf
;
169 iov
.iov_len
= data
? size
: sizeof(buf
);
173 ret
= sendmsg(fd
, &msg
, MSG_NOSIGNAL
);
178 int lxc_abstract_unix_recv_fds(int fd
, int *recvfds
, int num_recvfds
,
179 void *data
, size_t size
)
184 struct cmsghdr
*cmsg
= NULL
;
187 size_t cmsgbufsize
= CMSG_SPACE(num_recvfds
* sizeof(int));
189 memset(&msg
, 0, sizeof(msg
));
190 memset(&iov
, 0, sizeof(iov
));
192 cmsgbuf
= malloc(cmsgbufsize
);
196 msg
.msg_control
= cmsgbuf
;
197 msg
.msg_controllen
= cmsgbufsize
;
199 iov
.iov_base
= data
? data
: buf
;
200 iov
.iov_len
= data
? size
: sizeof(buf
);
204 ret
= recvmsg(fd
, &msg
, 0);
208 cmsg
= CMSG_FIRSTHDR(&msg
);
210 memset(recvfds
, -1, num_recvfds
* sizeof(int));
211 if (cmsg
&& cmsg
->cmsg_len
== CMSG_LEN(num_recvfds
* sizeof(int)) &&
212 cmsg
->cmsg_level
== SOL_SOCKET
&& cmsg
->cmsg_type
== SCM_RIGHTS
) {
213 memcpy(recvfds
, CMSG_DATA(cmsg
), num_recvfds
* sizeof(int));
221 int lxc_abstract_unix_send_credential(int fd
, void *data
, size_t size
)
223 struct msghdr msg
= {0};
225 struct cmsghdr
*cmsg
;
226 struct ucred cred
= {
227 .pid
= lxc_raw_getpid(), .uid
= getuid(), .gid
= getgid(),
229 char cmsgbuf
[CMSG_SPACE(sizeof(cred
))] = {0};
232 msg
.msg_control
= cmsgbuf
;
233 msg
.msg_controllen
= sizeof(cmsgbuf
);
235 cmsg
= CMSG_FIRSTHDR(&msg
);
236 cmsg
->cmsg_len
= CMSG_LEN(sizeof(struct ucred
));
237 cmsg
->cmsg_level
= SOL_SOCKET
;
238 cmsg
->cmsg_type
= SCM_CREDENTIALS
;
239 memcpy(CMSG_DATA(cmsg
), &cred
, sizeof(cred
));
244 iov
.iov_base
= data
? data
: buf
;
245 iov
.iov_len
= data
? size
: sizeof(buf
);
249 return sendmsg(fd
, &msg
, MSG_NOSIGNAL
);
252 int lxc_abstract_unix_rcv_credential(int fd
, void *data
, size_t size
)
254 struct msghdr msg
= {0};
256 struct cmsghdr
*cmsg
;
259 char cmsgbuf
[CMSG_SPACE(sizeof(cred
))] = {0};
264 msg
.msg_control
= cmsgbuf
;
265 msg
.msg_controllen
= sizeof(cmsgbuf
);
267 iov
.iov_base
= data
? data
: buf
;
268 iov
.iov_len
= data
? size
: sizeof(buf
);
272 ret
= recvmsg(fd
, &msg
, 0);
276 cmsg
= CMSG_FIRSTHDR(&msg
);
278 if (cmsg
&& cmsg
->cmsg_len
== CMSG_LEN(sizeof(struct ucred
)) &&
279 cmsg
->cmsg_level
== SOL_SOCKET
&&
280 cmsg
->cmsg_type
== SCM_CREDENTIALS
) {
281 memcpy(&cred
, CMSG_DATA(cmsg
), sizeof(cred
));
283 (cred
.uid
!= getuid() || cred
.gid
!= getgid())) {
284 INFO("message denied for '%d/%d'", cred
.uid
, cred
.gid
);