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 void winbind_close_sock(void)
66 if (winbindd_fd
!= -1) {
72 #define CONNECT_TIMEOUT 30
74 /* Make sure socket handle isn't stdin, stdout or stderr */
75 #define RECURSION_LIMIT 3
77 static int make_nonstd_fd_internals(int fd
, int limit
/* Recursion limiter */)
80 if (fd
>= 0 && fd
<= 2) {
82 if ((new_fd
= fcntl(fd
, F_DUPFD
, 3)) == -1) {
100 /* use the program stack to hold our list of FDs to close */
101 new_fd
= make_nonstd_fd_internals(new_fd
, limit
- 1);
109 /****************************************************************************
110 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
114 Set close on exec also.
115 ****************************************************************************/
117 static int make_safe_fd(int fd
)
120 int new_fd
= make_nonstd_fd_internals(fd
, RECURSION_LIMIT
);
126 /* Socket should be nonblocking. */
128 #define FLAG_TO_SET O_NONBLOCK
131 #define FLAG_TO_SET O_NDELAY
133 #define FLAG_TO_SET FNDELAY
137 if ((flags
= fcntl(new_fd
, F_GETFL
)) == -1) {
142 flags
|= FLAG_TO_SET
;
143 if (fcntl(new_fd
, F_SETFL
, flags
) == -1) {
150 /* Socket should be closed on exec() */
152 result
= flags
= fcntl(new_fd
, F_GETFD
, 0);
155 result
= fcntl( new_fd
, F_SETFD
, flags
);
165 /* Connect to winbindd socket */
167 static int winbind_named_pipe_sock(const char *dir
)
169 struct sockaddr_un sunaddr
;
176 /* Check permissions on unix socket directory */
178 if (lstat(dir
, &st
) == -1) {
182 if (!S_ISDIR(st
.st_mode
) ||
183 (st
.st_uid
!= 0 && st
.st_uid
!= geteuid())) {
187 /* Connect to socket */
189 strncpy(path
, dir
, sizeof(path
) - 1);
190 path
[sizeof(path
) - 1] = '\0';
192 strncat(path
, "/", sizeof(path
) - 1 - strlen(path
));
193 path
[sizeof(path
) - 1] = '\0';
195 strncat(path
, WINBINDD_SOCKET_NAME
, sizeof(path
) - 1 - strlen(path
));
196 path
[sizeof(path
) - 1] = '\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) {
210 /* Check permissions on unix socket file */
212 if (!S_ISSOCK(st
.st_mode
) ||
213 (st
.st_uid
!= 0 && st
.st_uid
!= geteuid())) {
217 /* Connect to socket */
219 if ((fd
= socket(AF_UNIX
, SOCK_STREAM
, 0)) == -1) {
223 /* Set socket non-blocking and close on exec. */
225 if ((fd
= make_safe_fd( fd
)) == -1) {
229 for (wait_time
= 0; connect(fd
, (struct sockaddr
*)&sunaddr
, sizeof(sunaddr
)) == -1;
230 wait_time
+= slept
) {
234 int connect_errno
= 0;
237 if (wait_time
>= CONNECT_TIMEOUT
)
244 tv
.tv_sec
= CONNECT_TIMEOUT
- wait_time
;
247 ret
= select(fd
+ 1, NULL
, &w_fds
, NULL
, &tv
);
250 errnosize
= sizeof(connect_errno
);
252 ret
= getsockopt(fd
, SOL_SOCKET
,
253 SO_ERROR
, &connect_errno
, &errnosize
);
255 if (ret
>= 0 && connect_errno
== 0) {
256 /* Connect succeed */
261 slept
= CONNECT_TIMEOUT
;
264 slept
= rand() % 3 + 1;
283 static const char *winbindd_socket_dir(void)
285 #ifdef SOCKET_WRAPPER
288 env_dir
= getenv(WINBINDD_SOCKET_DIR_ENVVAR
);
294 return WINBINDD_SOCKET_DIR
;
297 /* Connect to winbindd socket */
299 static int winbind_open_pipe_sock(int recursing
, int need_priv
)
301 #ifdef HAVE_UNIXSOCKET
302 static pid_t our_pid
;
303 struct winbindd_request request
;
304 struct winbindd_response response
;
305 ZERO_STRUCT(request
);
306 ZERO_STRUCT(response
);
308 if (our_pid
!= getpid()) {
309 winbind_close_sock();
313 if ((need_priv
!= 0) && (is_privileged
== 0)) {
314 winbind_close_sock();
317 if (winbindd_fd
!= -1) {
325 if ((winbindd_fd
= winbind_named_pipe_sock(winbindd_socket_dir())) == -1) {
331 /* version-check the socket */
333 request
.wb_flags
= WBFLAG_RECURSE
;
334 if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION
, &request
, &response
) != NSS_STATUS_SUCCESS
) || (response
.data
.interface_version
!= WINBIND_INTERFACE_VERSION
)) {
335 winbind_close_sock();
339 /* try and get priv pipe */
341 request
.wb_flags
= WBFLAG_RECURSE
;
342 if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR
, &request
, &response
) == NSS_STATUS_SUCCESS
) {
344 if ((fd
= winbind_named_pipe_sock((char *)response
.extra_data
.data
)) != -1) {
351 if ((need_priv
!= 0) && (is_privileged
== 0)) {
355 SAFE_FREE(response
.extra_data
.data
);
360 #endif /* HAVE_UNIXSOCKET */
363 /* Write data to winbindd socket */
365 int winbind_write_sock(void *buffer
, int count
, int recursing
, int need_priv
)
367 int result
, nwritten
;
369 /* Open connection to winbind daemon */
373 if (winbind_open_pipe_sock(recursing
, need_priv
) == -1) {
377 /* Write data to socket */
381 while(nwritten
< count
) {
385 /* Catch pipe close on other end by checking if a read()
386 call would not block by calling select(). */
389 FD_SET(winbindd_fd
, &r_fds
);
392 if (select(winbindd_fd
+ 1, &r_fds
, NULL
, NULL
, &tv
) == -1) {
393 winbind_close_sock();
394 return -1; /* Select error */
397 /* Write should be OK if fd not available for reading */
399 if (!FD_ISSET(winbindd_fd
, &r_fds
)) {
403 result
= write(winbindd_fd
,
404 (char *)buffer
+ nwritten
,
407 if ((result
== -1) || (result
== 0)) {
411 winbind_close_sock();
419 /* Pipe has closed on remote end */
421 winbind_close_sock();
429 /* Read data from winbindd socket */
431 int winbind_read_sock(void *buffer
, int count
)
434 int total_time
= 0, selret
;
436 if (winbindd_fd
== -1) {
440 /* Read data from socket */
441 while(nread
< count
) {
445 /* Catch pipe close on other end by checking if a read()
446 call would not block by calling select(). */
449 FD_SET(winbindd_fd
, &r_fds
);
451 /* Wait for 5 seconds for a reply. May need to parameterise this... */
454 if ((selret
= select(winbindd_fd
+ 1, &r_fds
, NULL
, NULL
, &tv
)) == -1) {
455 winbind_close_sock();
456 return -1; /* Select error */
460 /* Not ready for read yet... */
461 if (total_time
>= 30) {
463 winbind_close_sock();
470 if (FD_ISSET(winbindd_fd
, &r_fds
)) {
474 int result
= read(winbindd_fd
, (char *)buffer
+ nread
,
477 if ((result
== -1) || (result
== 0)) {
479 /* Read failed. I think the only useful thing we
480 can do here is just return -1 and fail since the
481 transaction has failed half way through. */
483 winbind_close_sock();
497 int winbindd_read_reply(struct winbindd_response
*response
)
499 int result1
, result2
= 0;
505 /* Read fixed length response */
507 result1
= winbind_read_sock(response
,
508 sizeof(struct winbindd_response
));
513 /* We actually send the pointer value of the extra_data field from
514 the server. This has no meaning in the client's address space
515 so we clear it out. */
517 response
->extra_data
.data
= NULL
;
519 /* Read variable length response */
521 if (response
->length
> sizeof(struct winbindd_response
)) {
522 int extra_data_len
= response
->length
-
523 sizeof(struct winbindd_response
);
525 /* Mallocate memory for extra data */
527 if (!(response
->extra_data
.data
= malloc(extra_data_len
))) {
531 result2
= winbind_read_sock(response
->extra_data
.data
,
534 winbindd_free_response(response
);
539 /* Return total amount of data read */
541 return result1
+ result2
;
544 bool winbind_env_set(void)
548 if ((env
=getenv(WINBINDD_DONT_ENV
)) != NULL
) {
549 if(strcmp(env
, "1") == 0) {
557 * send simple types of requests
560 NSS_STATUS
winbindd_send_request(int req_type
, int need_priv
,
561 struct winbindd_request
*request
)
563 struct winbindd_request lrequest
;
565 /* Check for our tricky environment variable */
567 if (winbind_env_set()) {
568 return NSS_STATUS_NOTFOUND
;
572 ZERO_STRUCT(lrequest
);
576 /* Fill in request and send down pipe */
578 winbindd_init_request(request
, req_type
);
580 if (winbind_write_sock(request
, sizeof(*request
),
581 request
->wb_flags
& WBFLAG_RECURSE
,
583 return NSS_STATUS_UNAVAIL
;
586 if ((request
->extra_len
!= 0) &&
587 (winbind_write_sock(request
->extra_data
.data
,
589 request
->wb_flags
& WBFLAG_RECURSE
,
591 return NSS_STATUS_UNAVAIL
;
594 return NSS_STATUS_SUCCESS
;
598 * Get results from winbindd request
601 NSS_STATUS
winbindd_get_response(struct winbindd_response
*response
)
603 struct winbindd_response lresponse
;
606 ZERO_STRUCT(lresponse
);
607 response
= &lresponse
;
610 init_response(response
);
613 if (winbindd_read_reply(response
) == -1) {
614 return NSS_STATUS_UNAVAIL
;
617 /* Throw away extra data if client didn't request it */
618 if (response
== &lresponse
) {
619 winbindd_free_response(response
);
622 /* Copy reply data from socket */
623 if (response
->result
!= WINBINDD_OK
) {
624 return NSS_STATUS_NOTFOUND
;
627 return NSS_STATUS_SUCCESS
;
630 /* Handle simple types of requests */
632 NSS_STATUS
winbindd_request_response(int req_type
,
633 struct winbindd_request
*request
,
634 struct winbindd_response
*response
)
636 NSS_STATUS status
= NSS_STATUS_UNAVAIL
;
639 while ((status
== NSS_STATUS_UNAVAIL
) && (count
< 10)) {
640 status
= winbindd_send_request(req_type
, 0, request
);
641 if (status
!= NSS_STATUS_SUCCESS
)
643 status
= winbindd_get_response(response
);
650 NSS_STATUS
winbindd_priv_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
, 1, request
);
659 if (status
!= NSS_STATUS_SUCCESS
)
661 status
= winbindd_get_response(response
);
668 /*************************************************************************
669 A couple of simple functions to disable winbindd lookups and re-
671 ************************************************************************/
673 bool winbind_off(void)
675 return setenv(WINBINDD_DONT_ENV
, "1", 1) != -1;
678 bool winbind_on(void)
680 return setenv(WINBINDD_DONT_ENV
, "0", 1) != -1;
683 /*************************************************************************
684 ************************************************************************/
686 const char *nss_err_str(NSS_STATUS ret
)
689 case NSS_STATUS_TRYAGAIN
:
690 return "NSS_STATUS_TRYAGAIN";
691 case NSS_STATUS_SUCCESS
:
692 return "NSS_STATUS_SUCCESS";
693 case NSS_STATUS_NOTFOUND
:
694 return "NSS_STATUS_NOTFOUND";
695 case NSS_STATUS_UNAVAIL
:
696 return "NSS_STATUS_UNAVAIL";
697 #ifdef NSS_STATUS_RETURN
698 case NSS_STATUS_RETURN
:
699 return "NSS_STATUS_RETURN";
702 return "UNKNOWN RETURN CODE!!!!!!!";