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, errnosize
;
239 if (wait_time
>= CONNECT_TIMEOUT
)
246 tv
.tv_sec
= CONNECT_TIMEOUT
- wait_time
;
249 ret
= select(fd
+ 1, NULL
, &w_fds
, NULL
, &tv
);
252 errnosize
= sizeof(connect_errno
);
254 ret
= getsockopt(fd
, SOL_SOCKET
,
255 SO_ERROR
, &connect_errno
, &errnosize
);
257 if (ret
>= 0 && connect_errno
== 0) {
258 /* Connect succeed */
263 slept
= CONNECT_TIMEOUT
;
266 slept
= rand() % 3 + 1;
285 /* Connect to winbindd socket */
287 static int winbind_open_pipe_sock(int recursing
)
289 #ifdef HAVE_UNIXSOCKET
290 static pid_t our_pid
;
291 struct winbindd_request request
;
292 struct winbindd_response response
;
293 ZERO_STRUCT(request
);
294 ZERO_STRUCT(response
);
296 if (our_pid
!= getpid()) {
301 if (winbindd_fd
!= -1) {
309 if ((winbindd_fd
= winbind_named_pipe_sock(WINBINDD_SOCKET_DIR
)) == -1) {
313 /* version-check the socket */
315 request
.flags
= WBFLAG_RECURSE
;
316 if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION
, &request
, &response
) != NSS_STATUS_SUCCESS
) || (response
.data
.interface_version
!= WINBIND_INTERFACE_VERSION
)) {
321 /* try and get priv pipe */
323 request
.flags
= WBFLAG_RECURSE
;
324 if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR
, &request
, &response
) == NSS_STATUS_SUCCESS
) {
326 if ((fd
= winbind_named_pipe_sock(response
.extra_data
)) != -1) {
332 SAFE_FREE(response
.extra_data
);
337 #endif /* HAVE_UNIXSOCKET */
340 /* Write data to winbindd socket */
342 int write_sock(void *buffer
, int count
, int recursing
)
344 int result
, nwritten
;
346 /* Open connection to winbind daemon */
350 if (winbind_open_pipe_sock(recursing
) == -1) {
354 /* Write data to socket */
358 while(nwritten
< count
) {
362 /* Catch pipe close on other end by checking if a read()
363 call would not block by calling select(). */
366 FD_SET(winbindd_fd
, &r_fds
);
369 if (select(winbindd_fd
+ 1, &r_fds
, NULL
, NULL
, &tv
) == -1) {
371 return -1; /* Select error */
374 /* Write should be OK if fd not available for reading */
376 if (!FD_ISSET(winbindd_fd
, &r_fds
)) {
380 result
= write(winbindd_fd
,
381 (char *)buffer
+ nwritten
,
384 if ((result
== -1) || (result
== 0)) {
396 /* Pipe has closed on remote end */
406 /* Read data from winbindd socket */
408 static int read_sock(void *buffer
, int count
)
410 int result
= 0, nread
= 0;
411 int total_time
= 0, selret
;
413 /* Read data from socket */
414 while(nread
< count
) {
418 /* Catch pipe close on other end by checking if a read()
419 call would not block by calling select(). */
422 FD_SET(winbindd_fd
, &r_fds
);
424 /* Wait for 5 seconds for a reply. May need to parameterise this... */
427 if ((selret
= select(winbindd_fd
+ 1, &r_fds
, NULL
, NULL
, &tv
)) == -1) {
429 return -1; /* Select error */
433 /* Not ready for read yet... */
434 if (total_time
>= 30) {
443 if (FD_ISSET(winbindd_fd
, &r_fds
)) {
447 result
= read(winbindd_fd
, (char *)buffer
+ nread
,
450 if ((result
== -1) || (result
== 0)) {
452 /* Read failed. I think the only useful thing we
453 can do here is just return -1 and fail since the
454 transaction has failed half way through. */
470 int read_reply(struct winbindd_response
*response
)
472 int result1
, result2
= 0;
478 /* Read fixed length response */
480 if ((result1
= read_sock(response
, sizeof(struct winbindd_response
)))
486 /* We actually send the pointer value of the extra_data field from
487 the server. This has no meaning in the client's address space
488 so we clear it out. */
490 response
->extra_data
= NULL
;
492 /* Read variable length response */
494 if (response
->length
> sizeof(struct winbindd_response
)) {
495 int extra_data_len
= response
->length
-
496 sizeof(struct winbindd_response
);
498 /* Mallocate memory for extra data */
500 if (!(response
->extra_data
= malloc(extra_data_len
))) {
504 if ((result2
= read_sock(response
->extra_data
, extra_data_len
))
506 free_response(response
);
511 /* Return total amount of data read */
513 return result1
+ result2
;
517 * send simple types of requests
520 NSS_STATUS
winbindd_send_request(int req_type
, struct winbindd_request
*request
)
522 struct winbindd_request lrequest
;
526 /* Check for our tricky environment variable */
528 if ( (env
= getenv(WINBINDD_DONT_ENV
)) != NULL
) {
531 return NSS_STATUS_NOTFOUND
;
535 ZERO_STRUCT(lrequest
);
539 /* Fill in request and send down pipe */
541 init_request(request
, req_type
);
543 if (write_sock(request
, sizeof(*request
), request
->flags
& WBFLAG_RECURSE
) == -1) {
544 return NSS_STATUS_UNAVAIL
;
547 if ((request
->extra_len
!= 0) &&
548 (write_sock(request
->extra_data
, request
->extra_len
, request
->flags
& WBFLAG_RECURSE
) == -1)) {
549 return NSS_STATUS_UNAVAIL
;
552 return NSS_STATUS_SUCCESS
;
556 * Get results from winbindd request
559 NSS_STATUS
winbindd_get_response(struct winbindd_response
*response
)
561 struct winbindd_response lresponse
;
564 ZERO_STRUCT(lresponse
);
565 response
= &lresponse
;
568 init_response(response
);
571 if (read_reply(response
) == -1) {
572 return NSS_STATUS_UNAVAIL
;
575 /* Throw away extra data if client didn't request it */
576 if (response
== &lresponse
) {
577 free_response(response
);
580 /* Copy reply data from socket */
581 if (response
->result
!= WINBINDD_OK
) {
582 return NSS_STATUS_NOTFOUND
;
585 return NSS_STATUS_SUCCESS
;
588 /* Handle simple types of requests */
590 NSS_STATUS
winbindd_request_response(int req_type
,
591 struct winbindd_request
*request
,
592 struct winbindd_response
*response
)
594 NSS_STATUS status
= NSS_STATUS_UNAVAIL
;
597 while ((status
== NSS_STATUS_UNAVAIL
) && (count
< 10)) {
598 status
= winbindd_send_request(req_type
, request
);
599 if (status
!= NSS_STATUS_SUCCESS
)
601 status
= winbindd_get_response(response
);
608 /*************************************************************************
609 A couple of simple functions to disable winbindd lookups and re-
611 ************************************************************************/
613 /* Use putenv() instead of setenv() in these functions as not all
614 environments have the latter. */
616 BOOL
winbind_off( void )
618 static char *s
= CONST_DISCARD(char *, WINBINDD_DONT_ENV
"=1");
620 return putenv(s
) != -1;
623 BOOL
winbind_on( void )
625 static char *s
= CONST_DISCARD(char *, WINBINDD_DONT_ENV
"=0");
627 return putenv(s
) != -1;