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.
28 #include "nsswitch/winbind_client.h"
30 /* Global variables. These are effectively the client state information */
32 int winbindd_fd
= -1; /* fd for winbindd socket */
34 /* Free a response structure */
36 void free_response(struct winbindd_response
*response
)
38 /* Free any allocated extra_data */
41 SAFE_FREE(response
->extra_data
);
44 /* Initialise a request structure */
46 void init_request(struct winbindd_request
*request
, int request_type
)
48 request
->length
= sizeof(struct winbindd_request
);
50 request
->cmd
= (enum winbindd_cmd
)request_type
;
51 request
->pid
= getpid();
55 /* Initialise a response structure */
57 void init_response(struct winbindd_response
*response
)
59 /* Initialise return value */
61 response
->result
= WINBINDD_ERROR
;
64 /* Close established socket */
68 if (winbindd_fd
!= -1) {
74 #define CONNECT_TIMEOUT 30
76 #define WRITE_TIMEOUT CONNECT_TIMEOUT
77 #define READ_TIMEOUT CONNECT_TIMEOUT
80 /* Make sure socket handle isn't stdin, stdout or stderr */
81 #define RECURSION_LIMIT 3
83 static int make_nonstd_fd_internals(int fd
, int limit
/* Recursion limiter */)
86 if (fd
>= 0 && fd
<= 2) {
88 if ((new_fd
= fcntl(fd
, F_DUPFD
, 3)) == -1) {
106 /* use the program stack to hold our list of FDs to close */
107 new_fd
= make_nonstd_fd_internals(new_fd
, limit
- 1);
115 /****************************************************************************
116 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
120 Set close on exec also.
121 ****************************************************************************/
123 static int make_safe_fd(int fd
)
126 int new_fd
= make_nonstd_fd_internals(fd
, RECURSION_LIMIT
);
132 /* Socket should be nonblocking. */
134 #define FLAG_TO_SET O_NONBLOCK
137 #define FLAG_TO_SET O_NDELAY
139 #define FLAG_TO_SET FNDELAY
143 if ((flags
= fcntl(new_fd
, F_GETFL
)) == -1) {
148 flags
|= FLAG_TO_SET
;
149 if (fcntl(new_fd
, F_SETFL
, flags
) == -1) {
156 /* Socket should be closed on exec() */
158 result
= flags
= fcntl(new_fd
, F_GETFD
, 0);
161 result
= fcntl( new_fd
, F_SETFD
, flags
);
171 /* Connect to winbindd socket */
173 static int winbind_named_pipe_sock(const char *dir
)
175 struct sockaddr_un sunaddr
;
182 /* Check permissions on unix socket directory */
184 if (lstat(dir
, &st
) == -1) {
188 if (!S_ISDIR(st
.st_mode
) ||
189 (st
.st_uid
!= 0 && st
.st_uid
!= geteuid())) {
193 /* Connect to socket */
195 asprintf(&path
, "%s%s", dir
, "/" WINBINDD_SOCKET_NAME
);
196 ZERO_STRUCT(sunaddr
);
197 sunaddr
.sun_family
= AF_UNIX
;
198 strncpy(sunaddr
.sun_path
, path
, sizeof(sunaddr
.sun_path
) - 1);
200 /* If socket file doesn't exist, don't bother trying to connect
201 with retry. This is an attempt to make the system usable when
202 the winbindd daemon is not running. */
204 if (lstat(path
, &st
) == -1) {
211 /* Check permissions on unix socket file */
213 if (!S_ISSOCK(st
.st_mode
) ||
214 (st
.st_uid
!= 0 && st
.st_uid
!= geteuid())) {
218 /* Connect to socket */
220 if ((fd
= socket(AF_UNIX
, SOCK_STREAM
, 0)) == -1) {
224 /* Set socket non-blocking and close on exec. */
226 if ((fd
= make_safe_fd( fd
)) == -1) {
230 for (wait_time
= 0; connect(fd
, (struct sockaddr
*)&sunaddr
, sizeof(sunaddr
)) == -1;
231 wait_time
+= slept
) {
235 int connect_errno
= 0;
238 if (wait_time
>= CONNECT_TIMEOUT
)
245 tv
.tv_sec
= CONNECT_TIMEOUT
- wait_time
;
248 ret
= select(fd
+ 1, NULL
, &w_fds
, NULL
, &tv
);
251 errnosize
= sizeof(connect_errno
);
253 ret
= getsockopt(fd
, SOL_SOCKET
,
254 SO_ERROR
, &connect_errno
, &errnosize
);
256 if (ret
>= 0 && connect_errno
== 0) {
257 /* Connect succeed */
262 slept
= CONNECT_TIMEOUT
;
265 slept
= rand() % 3 + 1;
283 if (connect(fd
, (struct sockaddr
*)&sunaddr
,
284 sizeof(sunaddr
)) == -1) {
292 /* Connect to winbindd socket */
294 int winbind_open_pipe_sock(void)
296 #ifdef HAVE_UNIXSOCKET
297 static pid_t our_pid
;
298 struct winbindd_request request
;
299 struct winbindd_response response
;
300 ZERO_STRUCT(request
);
301 ZERO_STRUCT(response
);
303 if (our_pid
!= getpid()) {
308 if (winbindd_fd
!= -1) {
312 if ((winbindd_fd
= winbind_named_pipe_sock(WINBINDD_SOCKET_DIR
)) == -1) {
316 /* version-check the socket */
318 if ((winbindd_request(WINBINDD_INTERFACE_VERSION
, &request
, &response
) != NSS_STATUS_SUCCESS
) || (response
.data
.interface_version
!= WINBIND_INTERFACE_VERSION
)) {
323 /* try and get priv pipe */
325 if (winbindd_request(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
)
345 int result
, nwritten
;
347 /* Open connection to winbind daemon */
351 if (winbind_open_pipe_sock() == -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
)) == -1) {
545 return NSS_STATUS_UNAVAIL
;
548 return NSS_STATUS_SUCCESS
;
552 * Get results from winbindd request
555 NSS_STATUS
winbindd_get_response(struct winbindd_response
*response
)
557 struct winbindd_response lresponse
;
560 ZERO_STRUCT(lresponse
);
561 response
= &lresponse
;
564 init_response(response
);
567 if (read_reply(response
) == -1) {
568 return NSS_STATUS_UNAVAIL
;
571 /* Throw away extra data if client didn't request it */
572 if (response
== &lresponse
) {
573 free_response(response
);
576 /* Copy reply data from socket */
577 if (response
->result
!= WINBINDD_OK
) {
578 return NSS_STATUS_NOTFOUND
;
581 return NSS_STATUS_SUCCESS
;
584 /* Handle simple types of requests */
586 NSS_STATUS
winbindd_request(int req_type
,
587 struct winbindd_request
*request
,
588 struct winbindd_response
*response
)
592 status
= winbindd_send_request(req_type
, request
);
593 if (status
!= NSS_STATUS_SUCCESS
)
595 return winbindd_get_response(response
);
598 /*************************************************************************
599 A couple of simple functions to disable winbindd lookups and re-
601 ************************************************************************/
603 BOOL
winbind_off( void )
605 setenv(WINBINDD_DONT_ENV
, "1", 1);
609 BOOL
winbind_on( void )
611 setenv(WINBINDD_DONT_ENV
, "0", 1);