]>
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 "raw_syscalls.h"
44 #include "include/strlcpy.h"
47 lxc_log_define(af_unix
, lxc
);
49 static ssize_t
lxc_abstract_unix_set_sockaddr(struct sockaddr_un
*addr
,
59 /* Clear address structure */
60 memset(addr
, 0, sizeof(*addr
));
62 addr
->sun_family
= AF_UNIX
;
64 len
= strlen(&path
[1]);
66 /* do not enforce \0-termination */
67 if (len
>= INT_MAX
|| len
>= sizeof(addr
->sun_path
)) {
72 /* do not enforce \0-termination */
73 memcpy(&addr
->sun_path
[1], &path
[1], len
);
77 int lxc_abstract_unix_open(const char *path
, int type
, int flags
)
81 struct sockaddr_un addr
;
83 fd
= socket(PF_UNIX
, type
, 0);
90 len
= lxc_abstract_unix_set_sockaddr(&addr
, path
);
92 int saved_errno
= errno
;
98 ret
= bind(fd
, (struct sockaddr
*)&addr
,
99 offsetof(struct sockaddr_un
, sun_path
) + len
+ 1);
101 int saved_errno
= errno
;
107 if (type
== SOCK_STREAM
) {
108 ret
= listen(fd
, 100);
110 int saved_errno
= errno
;
120 void lxc_abstract_unix_close(int fd
)
125 int lxc_abstract_unix_connect(const char *path
)
129 struct sockaddr_un addr
;
131 fd
= socket(PF_UNIX
, SOCK_STREAM
, 0);
135 len
= lxc_abstract_unix_set_sockaddr(&addr
, path
);
137 int saved_errno
= errno
;
143 ret
= connect(fd
, (struct sockaddr
*)&addr
,
144 offsetof(struct sockaddr_un
, sun_path
) + len
+ 1);
146 int saved_errno
= errno
;
155 int lxc_abstract_unix_send_fds(int fd
, int *sendfds
, int num_sendfds
,
156 void *data
, size_t size
)
161 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 ret
= sendmsg(fd
, &msg
, MSG_NOSIGNAL
);
197 int lxc_abstract_unix_recv_fds(int fd
, int *recvfds
, int num_recvfds
,
198 void *data
, size_t size
)
203 struct cmsghdr
*cmsg
= NULL
;
206 size_t cmsgbufsize
= CMSG_SPACE(num_recvfds
* sizeof(int));
208 memset(&msg
, 0, sizeof(msg
));
209 memset(&iov
, 0, sizeof(iov
));
211 cmsgbuf
= malloc(cmsgbufsize
);
217 msg
.msg_control
= cmsgbuf
;
218 msg
.msg_controllen
= cmsgbufsize
;
220 iov
.iov_base
= data
? data
: buf
;
221 iov
.iov_len
= data
? size
: sizeof(buf
);
225 ret
= recvmsg(fd
, &msg
, 0);
229 cmsg
= CMSG_FIRSTHDR(&msg
);
231 memset(recvfds
, -1, num_recvfds
* sizeof(int));
232 if (cmsg
&& cmsg
->cmsg_len
== CMSG_LEN(num_recvfds
* sizeof(int)) &&
233 cmsg
->cmsg_level
== SOL_SOCKET
&& cmsg
->cmsg_type
== SCM_RIGHTS
)
234 memcpy(recvfds
, CMSG_DATA(cmsg
), num_recvfds
* sizeof(int));
241 int lxc_abstract_unix_send_credential(int fd
, void *data
, size_t size
)
243 struct msghdr msg
= {0};
245 struct cmsghdr
*cmsg
;
246 struct ucred cred
= {
247 .pid
= lxc_raw_getpid(), .uid
= getuid(), .gid
= getgid(),
249 char cmsgbuf
[CMSG_SPACE(sizeof(cred
))] = {0};
252 msg
.msg_control
= cmsgbuf
;
253 msg
.msg_controllen
= sizeof(cmsgbuf
);
255 cmsg
= CMSG_FIRSTHDR(&msg
);
256 cmsg
->cmsg_len
= CMSG_LEN(sizeof(struct ucred
));
257 cmsg
->cmsg_level
= SOL_SOCKET
;
258 cmsg
->cmsg_type
= SCM_CREDENTIALS
;
259 memcpy(CMSG_DATA(cmsg
), &cred
, sizeof(cred
));
264 iov
.iov_base
= data
? data
: buf
;
265 iov
.iov_len
= data
? size
: sizeof(buf
);
269 return sendmsg(fd
, &msg
, MSG_NOSIGNAL
);
272 int lxc_abstract_unix_rcv_credential(int fd
, void *data
, size_t size
)
274 struct msghdr msg
= {0};
276 struct cmsghdr
*cmsg
;
279 char cmsgbuf
[CMSG_SPACE(sizeof(cred
))] = {0};
284 msg
.msg_control
= cmsgbuf
;
285 msg
.msg_controllen
= sizeof(cmsgbuf
);
287 iov
.iov_base
= data
? data
: buf
;
288 iov
.iov_len
= data
? size
: sizeof(buf
);
292 ret
= recvmsg(fd
, &msg
, 0);
296 cmsg
= CMSG_FIRSTHDR(&msg
);
298 if (cmsg
&& cmsg
->cmsg_len
== CMSG_LEN(sizeof(struct ucred
)) &&
299 cmsg
->cmsg_level
== SOL_SOCKET
&&
300 cmsg
->cmsg_type
== SCM_CREDENTIALS
) {
301 memcpy(&cred
, CMSG_DATA(cmsg
), sizeof(cred
));
303 (cred
.uid
!= getuid() || cred
.gid
!= getgid())) {
304 INFO("Message denied for '%d/%d'", cred
.uid
, cred
.gid
);