2 Unix SMB/Netbios implementation.
5 winbind client common code
7 Copyright (C) Tim Potter 2000
8 Copyright (C) Andrew Tridgell 2000
10 This library is free software; you can redistribute it and/or
11 modify it under the terms of the GNU Library General Public
12 License as published by the Free Software Foundation; either
13 version 2 of the License, or (at your option) any later version.
15 This library is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Library General Public License for more details.
20 You should have received a copy of the GNU Library General Public
21 License along with this library; if not, write to the
22 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA.
26 #include "winbind_nss_config.h"
27 #include "winbindd_nss.h"
29 /* Global variables. These are effectively the client state information */
31 static int established_socket
= -1; /* fd for winbindd socket */
32 static char *excluded_domain
;
35 smbd needs to be able to exclude lookups for its own domain
37 void winbind_exclude_domain(const char *domain
)
39 SAFE_FREE(excluded_domain
);
40 excluded_domain
= strdup(domain
);
44 /* Initialise a request structure */
46 void init_request(struct winbindd_request
*request
, int request_type
)
48 static char *domain_env
;
49 static BOOL initialised
;
51 request
->cmd
= (enum winbindd_cmd
)request_type
;
52 request
->pid
= getpid();
53 request
->domain
[0] = '\0';
57 domain_env
= getenv(WINBINDD_DOMAIN_ENV
);
61 strncpy(request
->domain
, domain_env
,
62 sizeof(request
->domain
) - 1);
63 request
->domain
[sizeof(request
->domain
) - 1] = '\0';
67 /* Initialise a response structure */
69 void init_response(struct winbindd_response
*response
)
71 /* Initialise return value */
73 response
->result
= WINBINDD_ERROR
;
76 /* Close established socket */
80 if (established_socket
!= -1) {
81 close(established_socket
);
82 established_socket
= -1;
86 /* Connect to winbindd socket */
88 static int open_pipe_sock(void)
90 struct sockaddr_un sunaddr
;
95 if (our_pid
!= getpid()) {
96 if (established_socket
!= -1) {
97 close(established_socket
);
99 established_socket
= -1;
103 if (established_socket
!= -1) {
104 return established_socket
;
107 /* Check permissions on unix socket directory */
109 if (lstat(WINBINDD_SOCKET_DIR
, &st
) == -1) {
113 if (!S_ISDIR(st
.st_mode
) ||
114 (st
.st_uid
!= 0 && st
.st_uid
!= geteuid())) {
118 /* Connect to socket */
120 strncpy(path
, WINBINDD_SOCKET_DIR
, sizeof(path
) - 1);
121 path
[sizeof(path
) - 1] = '\0';
123 strncat(path
, "/", sizeof(path
) - 1);
124 path
[sizeof(path
) - 1] = '\0';
126 strncat(path
, WINBINDD_SOCKET_NAME
, sizeof(path
) - 1);
127 path
[sizeof(path
) - 1] = '\0';
129 ZERO_STRUCT(sunaddr
);
130 sunaddr
.sun_family
= AF_UNIX
;
131 strncpy(sunaddr
.sun_path
, path
, sizeof(sunaddr
.sun_path
) - 1);
133 /* If socket file doesn't exist, don't bother trying to connect
134 with retry. This is an attempt to make the system usable when
135 the winbindd daemon is not running. */
137 if (lstat(path
, &st
) == -1) {
141 /* Check permissions on unix socket file */
143 if (!S_ISSOCK(st
.st_mode
) ||
144 (st
.st_uid
!= 0 && st
.st_uid
!= geteuid())) {
148 /* Connect to socket */
150 if ((established_socket
= socket(AF_UNIX
, SOCK_STREAM
, 0)) == -1) {
154 if (connect(established_socket
, (struct sockaddr
*)&sunaddr
,
155 sizeof(sunaddr
)) == -1) {
157 established_socket
= -1;
161 return established_socket
;
164 /* Write data to winbindd socket with timeout */
166 int write_sock(void *buffer
, int count
)
168 int result
, nwritten
;
170 /* Open connection to winbind daemon */
174 if (open_pipe_sock() == -1) {
178 /* Write data to socket */
182 while(nwritten
< count
) {
187 /* Catch pipe close on other end by checking if a read()
188 call would not block by calling select(). */
191 FD_SET(established_socket
, &r_fds
);
194 if ((selret
= select(established_socket
+ 1, &r_fds
,
195 NULL
, NULL
, &tv
)) == -1) {
197 return -1; /* Select error */
200 /* Write should be OK if fd not available for reading */
202 if (!FD_ISSET(established_socket
, &r_fds
)) {
206 result
= write(established_socket
,
207 (char *)buffer
+ nwritten
,
210 if ((result
== -1) || (result
== 0)) {
222 /* Pipe has closed on remote end */
232 /* Read data from winbindd socket with timeout */
234 static int read_sock(void *buffer
, int count
)
236 int result
= 0, nread
= 0;
238 /* Read data from socket */
240 while(nread
< count
) {
242 result
= read(established_socket
, (char *)buffer
+ nread
,
245 if ((result
== -1) || (result
== 0)) {
247 /* Read failed. I think the only useful thing we
248 can do here is just return -1 and fail since the
249 transaction has failed half way through. */
263 int read_reply(struct winbindd_response
*response
)
265 int result1
, result2
= 0;
271 /* Read fixed length response */
273 if ((result1
= read_sock(response
, sizeof(struct winbindd_response
)))
279 /* We actually send the pointer value of the extra_data field from
280 the server. This has no meaning in the client's address space
281 so we clear it out. */
283 response
->extra_data
= NULL
;
285 /* Read variable length response */
287 if (response
->length
> sizeof(struct winbindd_response
)) {
288 int extra_data_len
= response
->length
-
289 sizeof(struct winbindd_response
);
291 /* Mallocate memory for extra data */
293 if (!(response
->extra_data
= malloc(extra_data_len
))) {
297 if ((result2
= read_sock(response
->extra_data
, extra_data_len
))
303 /* Return total amount of data read */
305 return result1
+ result2
;
308 /* Free a response structure */
310 void free_response(struct winbindd_response
*response
)
312 /* Free any allocated extra_data */
315 SAFE_FREE(response
->extra_data
);
318 /* Handle simple types of requests */
320 NSS_STATUS
winbindd_request(int req_type
,
321 struct winbindd_request
*request
,
322 struct winbindd_response
*response
)
324 struct winbindd_request lrequest
;
325 struct winbindd_response lresponse
;
327 /* Check for our tricky environment variable */
329 if (getenv(WINBINDD_DONT_ENV
)) {
330 return NSS_STATUS_NOTFOUND
;
333 /* smbd may have excluded this domain */
334 if (excluded_domain
&&
335 strcasecmp(excluded_domain
, request
->domain
) == 0) {
336 return NSS_STATUS_NOTFOUND
;
340 ZERO_STRUCT(lresponse
);
341 response
= &lresponse
;
345 ZERO_STRUCT(lrequest
);
349 /* Fill in request and send down pipe */
351 init_request(request
, req_type
);
352 init_response(response
);
354 if (write_sock(request
, sizeof(*request
)) == -1) {
355 return NSS_STATUS_UNAVAIL
;
359 if (read_reply(response
) == -1) {
360 return NSS_STATUS_UNAVAIL
;
363 /* Throw away extra data if client didn't request it */
364 if (response
== &lresponse
) {
365 free_response(response
);
368 /* Copy reply data from socket */
369 if (response
->result
!= WINBINDD_OK
) {
370 return NSS_STATUS_NOTFOUND
;
373 return NSS_STATUS_SUCCESS
;