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 Library General Public
13 License as published by the Free Software Foundation; either
14 version 2 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 Library General Public
22 License along with this library; if not, write to the
23 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 Boston, MA 02111-1307, USA.
27 #include "winbind_client.h"
29 /* Global variables. These are effectively the client state information */
31 int winbindd_fd
= -1; /* fd for winbindd socket */
33 /* Free a response structure */
35 void free_response(struct winbindd_response
*response
)
37 /* Free any allocated extra_data */
40 SAFE_FREE(response
->extra_data
);
43 /* Initialise a request structure */
45 void init_request(struct winbindd_request
*request
, int request_type
)
47 request
->length
= sizeof(struct winbindd_request
);
49 request
->cmd
= (enum winbindd_cmd
)request_type
;
50 request
->pid
= getpid();
54 /* Initialise a response structure */
56 void init_response(struct winbindd_response
*response
)
58 /* Initialise return value */
60 response
->result
= WINBINDD_ERROR
;
63 /* Close established socket */
67 if (winbindd_fd
!= -1) {
73 #define CONNECT_TIMEOUT 30
74 #define WRITE_TIMEOUT CONNECT_TIMEOUT
75 #define READ_TIMEOUT CONNECT_TIMEOUT
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) {
185 if (!S_ISDIR(st
.st_mode
) ||
186 (st
.st_uid
!= 0 && st
.st_uid
!= geteuid())) {
190 /* Connect to socket */
192 strncpy(path
, dir
, sizeof(path
) - 1);
193 path
[sizeof(path
) - 1] = '\0';
195 strncat(path
, "/", sizeof(path
) - 1 - strlen(path
));
196 path
[sizeof(path
) - 1] = '\0';
198 strncat(path
, WINBINDD_SOCKET_NAME
, sizeof(path
) - 1 - strlen(path
));
199 path
[sizeof(path
) - 1] = '\0';
201 ZERO_STRUCT(sunaddr
);
202 sunaddr
.sun_family
= AF_UNIX
;
203 strncpy(sunaddr
.sun_path
, path
, sizeof(sunaddr
.sun_path
) - 1);
205 /* If socket file doesn't exist, don't bother trying to connect
206 with retry. This is an attempt to make the system usable when
207 the winbindd daemon is not running. */
209 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())) {
220 /* Connect to socket */
222 if ((fd
= socket(AF_UNIX
, SOCK_STREAM
, 0)) == -1) {
226 /* Set socket non-blocking and close on exec. */
228 if ((fd
= make_safe_fd( fd
)) == -1) {
232 for (wait_time
= 0; connect(fd
, (struct sockaddr
*)&sunaddr
, sizeof(sunaddr
)) == -1;
233 wait_time
+= slept
) {
237 int connect_errno
= 0;
240 if (wait_time
>= CONNECT_TIMEOUT
)
247 tv
.tv_sec
= CONNECT_TIMEOUT
- wait_time
;
250 ret
= select(fd
+ 1, NULL
, &w_fds
, NULL
, &tv
);
253 errnosize
= sizeof(connect_errno
);
255 ret
= getsockopt(fd
, SOL_SOCKET
,
256 SO_ERROR
, &connect_errno
, &errnosize
);
258 if (ret
>= 0 && connect_errno
== 0) {
259 /* Connect succeed */
264 slept
= CONNECT_TIMEOUT
;
267 slept
= rand() % 3 + 1;
286 /* Connect to winbindd socket */
288 static int winbind_open_pipe_sock(int recursing
)
290 #ifdef HAVE_UNIXSOCKET
291 static pid_t our_pid
;
292 struct winbindd_request request
;
293 struct winbindd_response response
;
294 ZERO_STRUCT(request
);
295 ZERO_STRUCT(response
);
297 if (our_pid
!= getpid()) {
302 if (winbindd_fd
!= -1) {
310 if ((winbindd_fd
= winbind_named_pipe_sock(WINBINDD_SOCKET_DIR
)) == -1) {
314 /* version-check the socket */
316 request
.flags
= WBFLAG_RECURSE
;
317 if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION
, &request
, &response
) != NSS_STATUS_SUCCESS
) || (response
.data
.interface_version
!= WINBIND_INTERFACE_VERSION
)) {
322 /* try and get priv pipe */
324 request
.flags
= WBFLAG_RECURSE
;
325 if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR
, &request
, &response
) == NSS_STATUS_SUCCESS
) {
327 if ((fd
= winbind_named_pipe_sock(response
.extra_data
)) != -1) {
333 SAFE_FREE(response
.extra_data
);
338 #endif /* HAVE_UNIXSOCKET */
341 /* Write data to winbindd socket */
343 int write_sock(void *buffer
, int count
, int recursing
)
345 int result
, nwritten
;
347 /* Open connection to winbind daemon */
351 if (winbind_open_pipe_sock(recursing
) == -1) {
355 /* Write data to socket */
359 while(nwritten
< count
) {
363 /* Catch pipe close on other end by checking if a read()
364 call would not block by calling select(). */
367 FD_SET(winbindd_fd
, &r_fds
);
370 if (select(winbindd_fd
+ 1, &r_fds
, NULL
, NULL
, &tv
) == -1) {
372 return -1; /* Select error */
375 /* Write should be OK if fd not available for reading */
377 if (!FD_ISSET(winbindd_fd
, &r_fds
)) {
381 result
= write(winbindd_fd
,
382 (char *)buffer
+ nwritten
,
385 if ((result
== -1) || (result
== 0)) {
397 /* Pipe has closed on remote end */
407 /* Read data from winbindd socket */
409 static int read_sock(void *buffer
, int count
)
411 int result
= 0, nread
= 0;
412 int total_time
= 0, selret
;
414 /* Read data from socket */
415 while(nread
< count
) {
419 /* Catch pipe close on other end by checking if a read()
420 call would not block by calling select(). */
423 FD_SET(winbindd_fd
, &r_fds
);
425 /* Wait for 5 seconds for a reply. May need to parameterise this... */
428 if ((selret
= select(winbindd_fd
+ 1, &r_fds
, NULL
, NULL
, &tv
)) == -1) {
430 return -1; /* Select error */
434 /* Not ready for read yet... */
435 if (total_time
>= 30) {
444 if (FD_ISSET(winbindd_fd
, &r_fds
)) {
448 result
= read(winbindd_fd
, (char *)buffer
+ nread
,
451 if ((result
== -1) || (result
== 0)) {
453 /* Read failed. I think the only useful thing we
454 can do here is just return -1 and fail since the
455 transaction has failed half way through. */
471 int read_reply(struct winbindd_response
*response
)
473 int result1
, result2
= 0;
479 /* Read fixed length response */
481 if ((result1
= read_sock(response
, sizeof(struct winbindd_response
)))
487 /* We actually send the pointer value of the extra_data field from
488 the server. This has no meaning in the client's address space
489 so we clear it out. */
491 response
->extra_data
= NULL
;
493 /* Read variable length response */
495 if (response
->length
> sizeof(struct winbindd_response
)) {
496 int extra_data_len
= response
->length
-
497 sizeof(struct winbindd_response
);
499 /* Mallocate memory for extra data */
501 if (!(response
->extra_data
= malloc(extra_data_len
))) {
505 if ((result2
= read_sock(response
->extra_data
, extra_data_len
))
507 free_response(response
);
512 /* Return total amount of data read */
514 return result1
+ result2
;
518 * send simple types of requests
521 NSS_STATUS
winbindd_send_request(int req_type
, struct winbindd_request
*request
)
523 struct winbindd_request lrequest
;
527 /* Check for our tricky environment variable */
529 if ( (env
= getenv(WINBINDD_DONT_ENV
)) != NULL
) {
532 return NSS_STATUS_NOTFOUND
;
536 ZERO_STRUCT(lrequest
);
540 /* Fill in request and send down pipe */
542 init_request(request
, req_type
);
544 if (write_sock(request
, sizeof(*request
), request
->flags
& WBFLAG_RECURSE
) == -1) {
545 return NSS_STATUS_UNAVAIL
;
548 if ((request
->extra_len
!= 0) &&
549 (write_sock(request
->extra_data
, request
->extra_len
, request
->flags
& WBFLAG_RECURSE
) == -1)) {
550 return NSS_STATUS_UNAVAIL
;
553 return NSS_STATUS_SUCCESS
;
557 * Get results from winbindd request
560 NSS_STATUS
winbindd_get_response(struct winbindd_response
*response
)
562 struct winbindd_response lresponse
;
565 ZERO_STRUCT(lresponse
);
566 response
= &lresponse
;
569 init_response(response
);
572 if (read_reply(response
) == -1) {
573 return NSS_STATUS_UNAVAIL
;
576 /* Throw away extra data if client didn't request it */
577 if (response
== &lresponse
) {
578 free_response(response
);
581 /* Copy reply data from socket */
582 if (response
->result
!= WINBINDD_OK
) {
583 return NSS_STATUS_NOTFOUND
;
586 return NSS_STATUS_SUCCESS
;
589 /* Handle simple types of requests */
591 NSS_STATUS
winbindd_request_response(int req_type
,
592 struct winbindd_request
*request
,
593 struct winbindd_response
*response
)
595 NSS_STATUS status
= NSS_STATUS_UNAVAIL
;
598 while ((status
== NSS_STATUS_UNAVAIL
) && (count
< 10)) {
599 status
= winbindd_send_request(req_type
, request
);
600 if (status
!= NSS_STATUS_SUCCESS
)
602 status
= winbindd_get_response(response
);
609 /*************************************************************************
610 A couple of simple functions to disable winbindd lookups and re-
612 ************************************************************************/
614 /* Use putenv() instead of setenv() in these functions as not all
615 environments have the latter. */
617 BOOL
winbind_off( void )
619 static char *s
= CONST_DISCARD(char *, WINBINDD_DONT_ENV
"=1");
621 return putenv(s
) != -1;
624 BOOL
winbind_on( void )
626 static char *s
= CONST_DISCARD(char *, WINBINDD_DONT_ENV
"=0");
628 return putenv(s
) != -1;