]>
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
34 #include <sys/socket.h>
35 #include <sys/syscall.h>
40 #include "memory_utils.h"
41 #include "raw_syscalls.h"
45 #include "include/strlcpy.h"
48 lxc_log_define(af_unix
, lxc
);
50 static ssize_t
lxc_abstract_unix_set_sockaddr(struct sockaddr_un
*addr
,
60 /* Clear address structure */
61 memset(addr
, 0, sizeof(*addr
));
63 addr
->sun_family
= AF_UNIX
;
65 len
= strlen(&path
[1]);
67 /* do not enforce \0-termination */
68 if (len
>= INT_MAX
|| len
>= sizeof(addr
->sun_path
)) {
73 /* do not enforce \0-termination */
74 memcpy(&addr
->sun_path
[1], &path
[1], len
);
78 int lxc_abstract_unix_open(const char *path
, int type
, int flags
)
82 struct sockaddr_un addr
;
84 fd
= socket(PF_UNIX
, type
, 0);
91 len
= lxc_abstract_unix_set_sockaddr(&addr
, path
);
93 int saved_errno
= errno
;
99 ret
= bind(fd
, (struct sockaddr
*)&addr
,
100 offsetof(struct sockaddr_un
, sun_path
) + len
+ 1);
102 int saved_errno
= errno
;
108 if (type
== SOCK_STREAM
) {
109 ret
= listen(fd
, 100);
111 int saved_errno
= errno
;
121 void lxc_abstract_unix_close(int fd
)
126 int lxc_abstract_unix_connect(const char *path
)
130 struct sockaddr_un addr
;
132 fd
= socket(PF_UNIX
, SOCK_STREAM
, 0);
136 len
= lxc_abstract_unix_set_sockaddr(&addr
, path
);
138 int saved_errno
= errno
;
144 ret
= connect(fd
, (struct sockaddr
*)&addr
,
145 offsetof(struct sockaddr_un
, sun_path
) + len
+ 1);
147 int saved_errno
= errno
;
156 int lxc_abstract_unix_send_fds(int fd
, int *sendfds
, int num_sendfds
,
157 void *data
, size_t size
)
159 __do_free
char *cmsgbuf
;
162 struct cmsghdr
*cmsg
= NULL
;
164 size_t cmsgbufsize
= CMSG_SPACE(num_sendfds
* sizeof(int));
166 memset(&msg
, 0, sizeof(msg
));
167 memset(&iov
, 0, sizeof(iov
));
169 cmsgbuf
= malloc(cmsgbufsize
);
175 msg
.msg_control
= cmsgbuf
;
176 msg
.msg_controllen
= cmsgbufsize
;
178 cmsg
= CMSG_FIRSTHDR(&msg
);
179 cmsg
->cmsg_level
= SOL_SOCKET
;
180 cmsg
->cmsg_type
= SCM_RIGHTS
;
181 cmsg
->cmsg_len
= CMSG_LEN(num_sendfds
* sizeof(int));
183 msg
.msg_controllen
= cmsg
->cmsg_len
;
185 memcpy(CMSG_DATA(cmsg
), sendfds
, num_sendfds
* sizeof(int));
187 iov
.iov_base
= data
? data
: buf
;
188 iov
.iov_len
= data
? size
: sizeof(buf
);
192 return sendmsg(fd
, &msg
, MSG_NOSIGNAL
);
195 int lxc_abstract_unix_recv_fds(int fd
, int *recvfds
, int num_recvfds
,
196 void *data
, size_t size
)
198 __do_free
char *cmsgbuf
;
202 struct cmsghdr
*cmsg
= NULL
;
204 size_t cmsgbufsize
= CMSG_SPACE(num_recvfds
* sizeof(int));
206 memset(&msg
, 0, sizeof(msg
));
207 memset(&iov
, 0, sizeof(iov
));
209 cmsgbuf
= malloc(cmsgbufsize
);
215 msg
.msg_control
= cmsgbuf
;
216 msg
.msg_controllen
= cmsgbufsize
;
218 iov
.iov_base
= data
? data
: buf
;
219 iov
.iov_len
= data
? size
: sizeof(buf
);
223 ret
= recvmsg(fd
, &msg
, 0);
227 cmsg
= CMSG_FIRSTHDR(&msg
);
229 memset(recvfds
, -1, num_recvfds
* sizeof(int));
230 if (cmsg
&& cmsg
->cmsg_len
== CMSG_LEN(num_recvfds
* sizeof(int)) &&
231 cmsg
->cmsg_level
== SOL_SOCKET
&& cmsg
->cmsg_type
== SCM_RIGHTS
)
232 memcpy(recvfds
, CMSG_DATA(cmsg
), num_recvfds
* sizeof(int));
238 int lxc_abstract_unix_send_credential(int fd
, void *data
, size_t size
)
240 struct msghdr msg
= {0};
242 struct cmsghdr
*cmsg
;
243 struct ucred cred
= {
244 .pid
= lxc_raw_getpid(), .uid
= getuid(), .gid
= getgid(),
246 char cmsgbuf
[CMSG_SPACE(sizeof(cred
))] = {0};
249 msg
.msg_control
= cmsgbuf
;
250 msg
.msg_controllen
= sizeof(cmsgbuf
);
252 cmsg
= CMSG_FIRSTHDR(&msg
);
253 cmsg
->cmsg_len
= CMSG_LEN(sizeof(struct ucred
));
254 cmsg
->cmsg_level
= SOL_SOCKET
;
255 cmsg
->cmsg_type
= SCM_CREDENTIALS
;
256 memcpy(CMSG_DATA(cmsg
), &cred
, sizeof(cred
));
261 iov
.iov_base
= data
? data
: buf
;
262 iov
.iov_len
= data
? size
: sizeof(buf
);
266 return sendmsg(fd
, &msg
, MSG_NOSIGNAL
);
269 int lxc_abstract_unix_rcv_credential(int fd
, void *data
, size_t size
)
271 struct msghdr msg
= {0};
273 struct cmsghdr
*cmsg
;
276 char cmsgbuf
[CMSG_SPACE(sizeof(cred
))] = {0};
281 msg
.msg_control
= cmsgbuf
;
282 msg
.msg_controllen
= sizeof(cmsgbuf
);
284 iov
.iov_base
= data
? data
: buf
;
285 iov
.iov_len
= data
? size
: sizeof(buf
);
289 ret
= recvmsg(fd
, &msg
, 0);
293 cmsg
= CMSG_FIRSTHDR(&msg
);
295 if (cmsg
&& cmsg
->cmsg_len
== CMSG_LEN(sizeof(struct ucred
)) &&
296 cmsg
->cmsg_level
== SOL_SOCKET
&&
297 cmsg
->cmsg_type
== SCM_CREDENTIALS
) {
298 memcpy(&cred
, CMSG_DATA(cmsg
), sizeof(cred
));
300 (cred
.uid
!= getuid() || cred
.gid
!= getgid())) {
301 INFO("Message denied for '%d/%d'", cred
.uid
, cred
.gid
);