2 Unix SMB/CIFS implementation.
4 winbind client common code
6 Copyright (C) Tim Potter 2000
7 Copyright (C) Andrew Tridgell 2000
8 Copyright (C) Andrew Bartlett 2002
11 This library is free software; you can redistribute it and/or
12 modify it under the terms of the GNU Lesser General Public
13 License as published by the Free Software Foundation; either
14 version 3 of the License, or (at your option) any later version.
16 This library is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 Library General Public License for more details.
21 You should have received a copy of the GNU Lesser General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "winbind_client.h"
27 /* Global variables. These are effectively the client state information */
29 int winbindd_fd
= -1; /* fd for winbindd socket */
30 static int is_privileged
= 0;
32 /* Free a response structure */
34 void winbindd_free_response(struct winbindd_response
*response
)
36 /* Free any allocated extra_data */
39 SAFE_FREE(response
->extra_data
.data
);
42 /* Initialise a request structure */
44 void winbindd_init_request(struct winbindd_request
*request
, int request_type
)
46 request
->length
= sizeof(struct winbindd_request
);
48 request
->cmd
= (enum winbindd_cmd
)request_type
;
49 request
->pid
= getpid();
53 /* Initialise a response structure */
55 static void init_response(struct winbindd_response
*response
)
57 /* Initialise return value */
59 response
->result
= WINBINDD_ERROR
;
62 /* Close established socket */
64 #if HAVE_FUNCTION_ATTRIBUTE_DESTRUCTOR
65 __attribute__((destructor
))
67 void winbind_close_sock(void)
69 if (winbindd_fd
!= -1) {
75 #define CONNECT_TIMEOUT 30
77 /* Make sure socket handle isn't stdin, stdout or stderr */
78 #define RECURSION_LIMIT 3
80 static int make_nonstd_fd_internals(int fd
, int limit
/* Recursion limiter */)
83 if (fd
>= 0 && fd
<= 2) {
85 if ((new_fd
= fcntl(fd
, F_DUPFD
, 3)) == -1) {
103 /* use the program stack to hold our list of FDs to close */
104 new_fd
= make_nonstd_fd_internals(new_fd
, limit
- 1);
112 /****************************************************************************
113 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
117 Set close on exec also.
118 ****************************************************************************/
120 static int make_safe_fd(int fd
)
123 int new_fd
= make_nonstd_fd_internals(fd
, RECURSION_LIMIT
);
129 /* Socket should be nonblocking. */
131 #define FLAG_TO_SET O_NONBLOCK
134 #define FLAG_TO_SET O_NDELAY
136 #define FLAG_TO_SET FNDELAY
140 if ((flags
= fcntl(new_fd
, F_GETFL
)) == -1) {
145 flags
|= FLAG_TO_SET
;
146 if (fcntl(new_fd
, F_SETFL
, flags
) == -1) {
153 /* Socket should be closed on exec() */
155 result
= flags
= fcntl(new_fd
, F_GETFD
, 0);
158 result
= fcntl( new_fd
, F_SETFD
, flags
);
168 /* Connect to winbindd socket */
170 static int winbind_named_pipe_sock(const char *dir
)
172 struct sockaddr_un sunaddr
;
179 /* Check permissions on unix socket directory */
181 if (lstat(dir
, &st
) == -1) {
186 if (!S_ISDIR(st
.st_mode
) ||
187 (st
.st_uid
!= 0 && st
.st_uid
!= geteuid())) {
192 /* Connect to socket */
194 if (asprintf(&path
, "%s/%s", dir
, WINBINDD_SOCKET_NAME
) < 0) {
198 ZERO_STRUCT(sunaddr
);
199 sunaddr
.sun_family
= AF_UNIX
;
200 strncpy(sunaddr
.sun_path
, path
, sizeof(sunaddr
.sun_path
) - 1);
202 /* If socket file doesn't exist, don't bother trying to connect
203 with retry. This is an attempt to make the system usable when
204 the winbindd daemon is not running. */
206 if (lstat(path
, &st
) == -1) {
213 /* Check permissions on unix socket file */
215 if (!S_ISSOCK(st
.st_mode
) ||
216 (st
.st_uid
!= 0 && st
.st_uid
!= geteuid())) {
221 /* Connect to socket */
223 if ((fd
= socket(AF_UNIX
, SOCK_STREAM
, 0)) == -1) {
227 /* Set socket non-blocking and close on exec. */
229 if ((fd
= make_safe_fd( fd
)) == -1) {
233 for (wait_time
= 0; connect(fd
, (struct sockaddr
*)&sunaddr
, sizeof(sunaddr
)) == -1;
234 wait_time
+= slept
) {
238 int connect_errno
= 0;
241 if (wait_time
>= CONNECT_TIMEOUT
)
247 if (fd
< 0 || fd
>= FD_SETSIZE
) {
252 tv
.tv_sec
= CONNECT_TIMEOUT
- wait_time
;
255 ret
= select(fd
+ 1, NULL
, &w_fds
, NULL
, &tv
);
258 errnosize
= sizeof(connect_errno
);
260 ret
= getsockopt(fd
, SOL_SOCKET
,
261 SO_ERROR
, &connect_errno
, &errnosize
);
263 if (ret
>= 0 && connect_errno
== 0) {
264 /* Connect succeed */
269 slept
= CONNECT_TIMEOUT
;
272 slept
= rand() % 3 + 1;
291 static const char *winbindd_socket_dir(void)
293 #ifdef SOCKET_WRAPPER
296 env_dir
= getenv(WINBINDD_SOCKET_DIR_ENVVAR
);
302 return WINBINDD_SOCKET_DIR
;
305 /* Connect to winbindd socket */
307 static int winbind_open_pipe_sock(int recursing
, int need_priv
)
309 #ifdef HAVE_UNIXSOCKET
310 static pid_t our_pid
;
311 struct winbindd_request request
;
312 struct winbindd_response response
;
313 ZERO_STRUCT(request
);
314 ZERO_STRUCT(response
);
316 if (our_pid
!= getpid()) {
317 winbind_close_sock();
321 if ((need_priv
!= 0) && (is_privileged
== 0)) {
322 winbind_close_sock();
325 if (winbindd_fd
!= -1) {
333 if ((winbindd_fd
= winbind_named_pipe_sock(winbindd_socket_dir())) == -1) {
339 /* version-check the socket */
341 request
.wb_flags
= WBFLAG_RECURSE
;
342 if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION
, &request
, &response
) != NSS_STATUS_SUCCESS
) || (response
.data
.interface_version
!= WINBIND_INTERFACE_VERSION
)) {
343 winbind_close_sock();
347 /* try and get priv pipe */
349 request
.wb_flags
= WBFLAG_RECURSE
;
350 if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR
, &request
, &response
) == NSS_STATUS_SUCCESS
) {
352 if ((fd
= winbind_named_pipe_sock((char *)response
.extra_data
.data
)) != -1) {
359 if ((need_priv
!= 0) && (is_privileged
== 0)) {
363 SAFE_FREE(response
.extra_data
.data
);
368 #endif /* HAVE_UNIXSOCKET */
371 /* Write data to winbindd socket */
373 int winbind_write_sock(void *buffer
, int count
, int recursing
, int need_priv
)
375 int result
, nwritten
;
377 /* Open connection to winbind daemon */
381 if (winbind_open_pipe_sock(recursing
, need_priv
) == -1) {
386 /* Write data to socket */
390 while(nwritten
< count
) {
394 /* Catch pipe close on other end by checking if a read()
395 call would not block by calling select(). */
398 if (winbindd_fd
< 0 || winbindd_fd
>= FD_SETSIZE
) {
400 winbind_close_sock();
403 FD_SET(winbindd_fd
, &r_fds
);
406 if (select(winbindd_fd
+ 1, &r_fds
, NULL
, NULL
, &tv
) == -1) {
407 winbind_close_sock();
408 return -1; /* Select error */
411 /* Write should be OK if fd not available for reading */
413 if (!FD_ISSET(winbindd_fd
, &r_fds
)) {
417 result
= write(winbindd_fd
,
418 (char *)buffer
+ nwritten
,
421 if ((result
== -1) || (result
== 0)) {
425 winbind_close_sock();
433 /* Pipe has closed on remote end */
435 winbind_close_sock();
443 /* Read data from winbindd socket */
445 int winbind_read_sock(void *buffer
, int count
)
448 int total_time
= 0, selret
;
450 if (winbindd_fd
== -1) {
454 /* Read data from socket */
455 while(nread
< count
) {
459 /* Catch pipe close on other end by checking if a read()
460 call would not block by calling select(). */
463 if (winbindd_fd
< 0 || winbindd_fd
>= FD_SETSIZE
) {
465 winbind_close_sock();
468 FD_SET(winbindd_fd
, &r_fds
);
470 /* Wait for 5 seconds for a reply. May need to parameterise this... */
473 if ((selret
= select(winbindd_fd
+ 1, &r_fds
, NULL
, NULL
, &tv
)) == -1) {
474 winbind_close_sock();
475 return -1; /* Select error */
479 /* Not ready for read yet... */
480 if (total_time
>= 30) {
482 winbind_close_sock();
489 if (FD_ISSET(winbindd_fd
, &r_fds
)) {
493 int result
= read(winbindd_fd
, (char *)buffer
+ nread
,
496 if ((result
== -1) || (result
== 0)) {
498 /* Read failed. I think the only useful thing we
499 can do here is just return -1 and fail since the
500 transaction has failed half way through. */
502 winbind_close_sock();
516 int winbindd_read_reply(struct winbindd_response
*response
)
518 int result1
, result2
= 0;
524 /* Read fixed length response */
526 result1
= winbind_read_sock(response
,
527 sizeof(struct winbindd_response
));
532 /* We actually send the pointer value of the extra_data field from
533 the server. This has no meaning in the client's address space
534 so we clear it out. */
536 response
->extra_data
.data
= NULL
;
538 /* Read variable length response */
540 if (response
->length
> sizeof(struct winbindd_response
)) {
541 int extra_data_len
= response
->length
-
542 sizeof(struct winbindd_response
);
544 /* Mallocate memory for extra data */
546 if (!(response
->extra_data
.data
= malloc(extra_data_len
))) {
550 result2
= winbind_read_sock(response
->extra_data
.data
,
553 winbindd_free_response(response
);
558 /* Return total amount of data read */
560 return result1
+ result2
;
564 * send simple types of requests
567 NSS_STATUS
winbindd_send_request(int req_type
, int need_priv
,
568 struct winbindd_request
*request
)
570 struct winbindd_request lrequest
;
572 /* Check for our tricky environment variable */
574 if (winbind_env_set()) {
575 return NSS_STATUS_NOTFOUND
;
579 ZERO_STRUCT(lrequest
);
583 /* Fill in request and send down pipe */
585 winbindd_init_request(request
, req_type
);
587 if (winbind_write_sock(request
, sizeof(*request
),
588 request
->wb_flags
& WBFLAG_RECURSE
,
591 /* Set ENOENT for consistency. Required by some apps */
594 return NSS_STATUS_UNAVAIL
;
597 if ((request
->extra_len
!= 0) &&
598 (winbind_write_sock(request
->extra_data
.data
,
600 request
->wb_flags
& WBFLAG_RECURSE
,
603 /* Set ENOENT for consistency. Required by some apps */
606 return NSS_STATUS_UNAVAIL
;
609 return NSS_STATUS_SUCCESS
;
613 * Get results from winbindd request
616 NSS_STATUS
winbindd_get_response(struct winbindd_response
*response
)
618 struct winbindd_response lresponse
;
621 ZERO_STRUCT(lresponse
);
622 response
= &lresponse
;
625 init_response(response
);
628 if (winbindd_read_reply(response
) == -1) {
629 /* Set ENOENT for consistency. Required by some apps */
632 return NSS_STATUS_UNAVAIL
;
635 /* Throw away extra data if client didn't request it */
636 if (response
== &lresponse
) {
637 winbindd_free_response(response
);
640 /* Copy reply data from socket */
641 if (response
->result
!= WINBINDD_OK
) {
642 return NSS_STATUS_NOTFOUND
;
645 return NSS_STATUS_SUCCESS
;
648 /* Handle simple types of requests */
650 NSS_STATUS
winbindd_request_response(int req_type
,
651 struct winbindd_request
*request
,
652 struct winbindd_response
*response
)
654 NSS_STATUS status
= NSS_STATUS_UNAVAIL
;
657 while ((status
== NSS_STATUS_UNAVAIL
) && (count
< 10)) {
658 status
= winbindd_send_request(req_type
, 0, request
);
659 if (status
!= NSS_STATUS_SUCCESS
)
661 status
= winbindd_get_response(response
);
668 NSS_STATUS
winbindd_priv_request_response(int req_type
,
669 struct winbindd_request
*request
,
670 struct winbindd_response
*response
)
672 NSS_STATUS status
= NSS_STATUS_UNAVAIL
;
675 while ((status
== NSS_STATUS_UNAVAIL
) && (count
< 10)) {
676 status
= winbindd_send_request(req_type
, 1, request
);
677 if (status
!= NSS_STATUS_SUCCESS
)
679 status
= winbindd_get_response(response
);
686 /*************************************************************************
687 ************************************************************************/
689 const char *nss_err_str(NSS_STATUS ret
)
692 case NSS_STATUS_TRYAGAIN
:
693 return "NSS_STATUS_TRYAGAIN";
694 case NSS_STATUS_SUCCESS
:
695 return "NSS_STATUS_SUCCESS";
696 case NSS_STATUS_NOTFOUND
:
697 return "NSS_STATUS_NOTFOUND";
698 case NSS_STATUS_UNAVAIL
:
699 return "NSS_STATUS_UNAVAIL";
700 #ifdef NSS_STATUS_RETURN
701 case NSS_STATUS_RETURN
:
702 return "NSS_STATUS_RETURN";
705 return "UNKNOWN RETURN CODE!!!!!!!";