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;