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 /* Make sure socket handle isn't stdin, stdout or stderr */
74 #define RECURSION_LIMIT 3
76 static int make_nonstd_fd_internals(int fd
, int limit
/* Recursion limiter */)
79 if (fd
>= 0 && fd
<= 2) {
81 if ((new_fd
= fcntl(fd
, F_DUPFD
, 3)) == -1) {
99 /* use the program stack to hold our list of FDs to close */
100 new_fd
= make_nonstd_fd_internals(new_fd
, limit
- 1);
108 static int make_safe_fd(int fd
)
111 int new_fd
= make_nonstd_fd_internals(fd
, RECURSION_LIMIT
);
116 /* Socket should be closed on exec() */
119 result
= flags
= fcntl(new_fd
, F_GETFD
, 0);
122 result
= fcntl( new_fd
, F_SETFD
, flags
);
132 /* Connect to winbindd socket */
134 static int winbind_named_pipe_sock(const char *dir
)
136 struct sockaddr_un sunaddr
;
141 /* Check permissions on unix socket directory */
143 if (lstat(dir
, &st
) == -1) {
147 if (!S_ISDIR(st
.st_mode
) ||
148 (st
.st_uid
!= 0 && st
.st_uid
!= geteuid())) {
152 /* Connect to socket */
154 strncpy(path
, dir
, sizeof(path
) - 1);
155 path
[sizeof(path
) - 1] = '\0';
157 strncat(path
, "/", sizeof(path
) - 1 - strlen(path
));
158 path
[sizeof(path
) - 1] = '\0';
160 strncat(path
, WINBINDD_SOCKET_NAME
, sizeof(path
) - 1 - strlen(path
));
161 path
[sizeof(path
) - 1] = '\0';
163 ZERO_STRUCT(sunaddr
);
164 sunaddr
.sun_family
= AF_UNIX
;
165 strncpy(sunaddr
.sun_path
, path
, sizeof(sunaddr
.sun_path
) - 1);
167 /* If socket file doesn't exist, don't bother trying to connect
168 with retry. This is an attempt to make the system usable when
169 the winbindd daemon is not running. */
171 if (lstat(path
, &st
) == -1) {
175 /* Check permissions on unix socket file */
177 if (!S_ISSOCK(st
.st_mode
) ||
178 (st
.st_uid
!= 0 && st
.st_uid
!= geteuid())) {
182 /* Connect to socket */
184 if ((fd
= socket(AF_UNIX
, SOCK_STREAM
, 0)) == -1) {
188 if ((fd
= make_safe_fd( fd
)) == -1) {
192 if (connect(fd
, (struct sockaddr
*)&sunaddr
,
193 sizeof(sunaddr
)) == -1) {
201 /* Connect to winbindd socket */
203 int winbind_open_pipe_sock(void)
205 #ifdef HAVE_UNIXSOCKET
206 static pid_t our_pid
;
207 struct winbindd_request request
;
208 struct winbindd_response response
;
209 ZERO_STRUCT(request
);
210 ZERO_STRUCT(response
);
212 if (our_pid
!= getpid()) {
217 if (winbindd_fd
!= -1) {
221 if ((winbindd_fd
= winbind_named_pipe_sock(WINBINDD_SOCKET_DIR
)) == -1) {
225 /* version-check the socket */
227 if ((winbindd_request(WINBINDD_INTERFACE_VERSION
, &request
, &response
) != NSS_STATUS_SUCCESS
) || (response
.data
.interface_version
!= WINBIND_INTERFACE_VERSION
)) {
232 /* try and get priv pipe */
234 if (winbindd_request(WINBINDD_PRIV_PIPE_DIR
, &request
, &response
) == NSS_STATUS_SUCCESS
) {
236 if ((fd
= winbind_named_pipe_sock(response
.extra_data
)) != -1) {
245 #endif /* HAVE_UNIXSOCKET */
248 /* Write data to winbindd socket */
250 int write_sock(void *buffer
, int count
)
252 int result
, nwritten
;
254 /* Open connection to winbind daemon */
258 if (winbind_open_pipe_sock() == -1) {
262 /* Write data to socket */
266 while(nwritten
< count
) {
270 /* Catch pipe close on other end by checking if a read()
271 call would not block by calling select(). */
274 FD_SET(winbindd_fd
, &r_fds
);
277 if (select(winbindd_fd
+ 1, &r_fds
, NULL
, NULL
, &tv
) == -1) {
279 return -1; /* Select error */
282 /* Write should be OK if fd not available for reading */
284 if (!FD_ISSET(winbindd_fd
, &r_fds
)) {
288 result
= write(winbindd_fd
,
289 (char *)buffer
+ nwritten
,
292 if ((result
== -1) || (result
== 0)) {
304 /* Pipe has closed on remote end */
314 /* Read data from winbindd socket */
316 static int read_sock(void *buffer
, int count
)
318 int result
= 0, nread
= 0;
320 /* Read data from socket */
322 while(nread
< count
) {
324 result
= read(winbindd_fd
, (char *)buffer
+ nread
,
327 if ((result
== -1) || (result
== 0)) {
329 /* Read failed. I think the only useful thing we
330 can do here is just return -1 and fail since the
331 transaction has failed half way through. */
345 int read_reply(struct winbindd_response
*response
)
347 int result1
, result2
= 0;
353 /* Read fixed length response */
355 if ((result1
= read_sock(response
, sizeof(struct winbindd_response
)))
361 /* We actually send the pointer value of the extra_data field from
362 the server. This has no meaning in the client's address space
363 so we clear it out. */
365 response
->extra_data
= NULL
;
367 /* Read variable length response */
369 if (response
->length
> sizeof(struct winbindd_response
)) {
370 int extra_data_len
= response
->length
-
371 sizeof(struct winbindd_response
);
373 /* Mallocate memory for extra data */
375 if (!(response
->extra_data
= malloc(extra_data_len
))) {
379 if ((result2
= read_sock(response
->extra_data
, extra_data_len
))
381 free_response(response
);
386 /* Return total amount of data read */
388 return result1
+ result2
;
392 * send simple types of requests
395 NSS_STATUS
winbindd_send_request(int req_type
, struct winbindd_request
*request
)
397 struct winbindd_request lrequest
;
399 /* Check for our tricky environment variable */
401 if (getenv(WINBINDD_DONT_ENV
)) {
402 return NSS_STATUS_NOTFOUND
;
406 ZERO_STRUCT(lrequest
);
410 /* Fill in request and send down pipe */
412 init_request(request
, req_type
);
414 if (write_sock(request
, sizeof(*request
)) == -1) {
415 return NSS_STATUS_UNAVAIL
;
418 return NSS_STATUS_SUCCESS
;
422 * Get results from winbindd request
425 NSS_STATUS
winbindd_get_response(struct winbindd_response
*response
)
427 struct winbindd_response lresponse
;
430 ZERO_STRUCT(lresponse
);
431 response
= &lresponse
;
434 init_response(response
);
437 if (read_reply(response
) == -1) {
438 return NSS_STATUS_UNAVAIL
;
441 /* Throw away extra data if client didn't request it */
442 if (response
== &lresponse
) {
443 free_response(response
);
446 /* Copy reply data from socket */
447 if (response
->result
!= WINBINDD_OK
) {
448 return NSS_STATUS_NOTFOUND
;
451 return NSS_STATUS_SUCCESS
;
454 /* Handle simple types of requests */
456 NSS_STATUS
winbindd_request(int req_type
,
457 struct winbindd_request
*request
,
458 struct winbindd_response
*response
)
462 status
= winbindd_send_request(req_type
, request
);
463 if (status
!= NSS_STATUS_SUCCESS
)
465 return winbindd_get_response(response
);