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 Lesser General Public
13 License as published by the Free Software Foundation; either
14 version 3 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 Lesser General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "winbind_client.h"
27 /* Global variables. These are effectively the client state information */
29 int winbindd_fd = -1; /* fd for winbindd socket */
30 static int is_privileged = 0;
32 /* Free a response structure */
34 void winbindd_free_response(struct winbindd_response *response)
36 /* Free any allocated extra_data */
39 SAFE_FREE(response->extra_data.data);
42 /* Initialise a request structure */
44 static void winbindd_init_request(struct winbindd_request *request,
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 static void init_response(struct winbindd_response *response)
58 /* Initialise return value */
60 response->result = WINBINDD_ERROR;
63 /* Close established socket */
65 static void winbind_close_sock(void)
67 if (winbindd_fd != -1) {
73 #define CONNECT_TIMEOUT 30
75 /* Make sure socket handle isn't stdin, stdout or stderr */
76 #define RECURSION_LIMIT 3
78 static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
81 if (fd >= 0 && fd <= 2) {
83 if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
101 /* use the program stack to hold our list of FDs to close */
102 new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
110 /****************************************************************************
111 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
115 Set close on exec also.
116 ****************************************************************************/
118 static int make_safe_fd(int fd)
121 int new_fd = make_nonstd_fd_internals(fd, RECURSION_LIMIT);
127 /* Socket should be nonblocking. */
129 #define FLAG_TO_SET O_NONBLOCK
132 #define FLAG_TO_SET O_NDELAY
134 #define FLAG_TO_SET FNDELAY
138 if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
143 flags |= FLAG_TO_SET;
144 if (fcntl(new_fd, F_SETFL, flags) == -1) {
151 /* Socket should be closed on exec() */
153 result = flags = fcntl(new_fd, F_GETFD, 0);
156 result = fcntl( new_fd, F_SETFD, flags );
166 /* Connect to winbindd socket */
168 static int winbind_named_pipe_sock(const char *dir)
170 struct sockaddr_un sunaddr;
177 /* Check permissions on unix socket directory */
179 if (lstat(dir, &st) == -1) {
184 if (!S_ISDIR(st.st_mode) ||
185 (st.st_uid != 0 && st.st_uid != geteuid())) {
190 /* Connect to socket */
192 if (asprintf(&path, "%s/%s", dir, WINBINDD_SOCKET_NAME) < 0) {
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())) {
219 /* Connect to socket */
221 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
225 /* Set socket non-blocking and close on exec. */
227 if ((fd = make_safe_fd( fd)) == -1) {
231 for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
232 wait_time += slept) {
236 int connect_errno = 0;
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 static const char *winbindd_socket_dir(void)
287 #ifdef SOCKET_WRAPPER
290 env_dir = getenv(WINBINDD_SOCKET_DIR_ENVVAR);
296 return WINBINDD_SOCKET_DIR;
299 /* Connect to winbindd socket */
301 static int winbind_open_pipe_sock(int recursing, int need_priv)
303 #ifdef HAVE_UNIXSOCKET
304 static pid_t our_pid;
305 struct winbindd_request request;
306 struct winbindd_response response;
307 ZERO_STRUCT(request);
308 ZERO_STRUCT(response);
310 if (our_pid != getpid()) {
311 winbind_close_sock();
315 if ((need_priv != 0) && (is_privileged == 0)) {
316 winbind_close_sock();
319 if (winbindd_fd != -1) {
327 if ((winbindd_fd = winbind_named_pipe_sock(winbindd_socket_dir())) == -1) {
333 /* version-check the socket */
335 request.wb_flags = WBFLAG_RECURSE;
336 if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
337 winbind_close_sock();
341 /* try and get priv pipe */
343 request.wb_flags = WBFLAG_RECURSE;
344 if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
346 if ((fd = winbind_named_pipe_sock((char *)response.extra_data.data)) != -1) {
353 if ((need_priv != 0) && (is_privileged == 0)) {
357 SAFE_FREE(response.extra_data.data);
362 #endif /* HAVE_UNIXSOCKET */
365 /* Write data to winbindd socket */
367 static int winbind_write_sock(void *buffer, int count, int recursing,
370 int result, nwritten;
372 /* Open connection to winbind daemon */
376 if (winbind_open_pipe_sock(recursing, need_priv) == -1) {
381 /* Write data to socket */
385 while(nwritten < count) {
389 /* Catch pipe close on other end by checking if a read()
390 call would not block by calling select(). */
393 FD_SET(winbindd_fd, &r_fds);
396 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
397 winbind_close_sock();
398 return -1; /* Select error */
401 /* Write should be OK if fd not available for reading */
403 if (!FD_ISSET(winbindd_fd, &r_fds)) {
407 result = write(winbindd_fd,
408 (char *)buffer + nwritten,
411 if ((result == -1) || (result == 0)) {
415 winbind_close_sock();
423 /* Pipe has closed on remote end */
425 winbind_close_sock();
433 /* Read data from winbindd socket */
435 static int winbind_read_sock(void *buffer, int count)
438 int total_time = 0, selret;
440 if (winbindd_fd == -1) {
444 /* Read data from socket */
445 while(nread < count) {
449 /* Catch pipe close on other end by checking if a read()
450 call would not block by calling select(). */
453 FD_SET(winbindd_fd, &r_fds);
455 /* Wait for 5 seconds for a reply. May need to parameterise this... */
458 if ((selret = select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv)) == -1) {
459 winbind_close_sock();
460 return -1; /* Select error */
464 /* Not ready for read yet... */
465 if (total_time >= 30) {
467 winbind_close_sock();
474 if (FD_ISSET(winbindd_fd, &r_fds)) {
478 int result = read(winbindd_fd, (char *)buffer + nread,
481 if ((result == -1) || (result == 0)) {
483 /* Read failed. I think the only useful thing we
484 can do here is just return -1 and fail since the
485 transaction has failed half way through. */
487 winbind_close_sock();
501 static int winbindd_read_reply(struct winbindd_response *response)
503 int result1, result2 = 0;
509 /* Read fixed length response */
511 result1 = winbind_read_sock(response,
512 sizeof(struct winbindd_response));
517 /* We actually send the pointer value of the extra_data field from
518 the server. This has no meaning in the client's address space
519 so we clear it out. */
521 response->extra_data.data = NULL;
523 /* Read variable length response */
525 if (response->length > sizeof(struct winbindd_response)) {
526 int extra_data_len = response->length -
527 sizeof(struct winbindd_response);
529 /* Mallocate memory for extra data */
531 if (!(response->extra_data.data = malloc(extra_data_len))) {
535 result2 = winbind_read_sock(response->extra_data.data,
538 winbindd_free_response(response);
543 /* Return total amount of data read */
545 return result1 + result2;
549 * send simple types of requests
552 NSS_STATUS winbindd_send_request(int req_type, int need_priv,
553 struct winbindd_request *request)
555 struct winbindd_request lrequest;
557 /* Check for our tricky environment variable */
559 if (winbind_env_set()) {
560 return NSS_STATUS_NOTFOUND;
564 ZERO_STRUCT(lrequest);
568 /* Fill in request and send down pipe */
570 winbindd_init_request(request, req_type);
572 if (winbind_write_sock(request, sizeof(*request),
573 request->wb_flags & WBFLAG_RECURSE,
576 /* Set ENOENT for consistency. Required by some apps */
579 return NSS_STATUS_UNAVAIL;
582 if ((request->extra_len != 0) &&
583 (winbind_write_sock(request->extra_data.data,
585 request->wb_flags & WBFLAG_RECURSE,
588 /* Set ENOENT for consistency. Required by some apps */
591 return NSS_STATUS_UNAVAIL;
594 return NSS_STATUS_SUCCESS;
598 * Get results from winbindd request
601 NSS_STATUS winbindd_get_response(struct winbindd_response *response)
603 struct winbindd_response lresponse;
606 ZERO_STRUCT(lresponse);
607 response = &lresponse;
610 init_response(response);
613 if (winbindd_read_reply(response) == -1) {
614 /* Set ENOENT for consistency. Required by some apps */
617 return NSS_STATUS_UNAVAIL;
620 /* Throw away extra data if client didn't request it */
621 if (response == &lresponse) {
622 winbindd_free_response(response);
625 /* Copy reply data from socket */
626 if (response->result != WINBINDD_OK) {
627 return NSS_STATUS_NOTFOUND;
630 return NSS_STATUS_SUCCESS;
633 /* Handle simple types of requests */
635 NSS_STATUS winbindd_request_response(int req_type,
636 struct winbindd_request *request,
637 struct winbindd_response *response)
639 NSS_STATUS status = NSS_STATUS_UNAVAIL;
642 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
643 status = winbindd_send_request(req_type, 0, request);
644 if (status != NSS_STATUS_SUCCESS)
646 status = winbindd_get_response(response);
653 NSS_STATUS winbindd_priv_request_response(int req_type,
654 struct winbindd_request *request,
655 struct winbindd_response *response)
657 NSS_STATUS status = NSS_STATUS_UNAVAIL;
660 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
661 status = winbindd_send_request(req_type, 1, request);
662 if (status != NSS_STATUS_SUCCESS)
664 status = winbindd_get_response(response);