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 #if HAVE_FUNCTION_ATTRIBUTE_DESTRUCTOR
66 __attribute__((destructor))
68 static void winbind_close_sock(void)
70 if (winbindd_fd != -1) {
76 #define CONNECT_TIMEOUT 30
78 /* Make sure socket handle isn't stdin, stdout or stderr */
79 #define RECURSION_LIMIT 3
81 static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
84 if (fd >= 0 && fd <= 2) {
86 if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
104 /* use the program stack to hold our list of FDs to close */
105 new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
113 /****************************************************************************
114 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
118 Set close on exec also.
119 ****************************************************************************/
121 static int make_safe_fd(int fd)
124 int new_fd = make_nonstd_fd_internals(fd, RECURSION_LIMIT);
130 /* Socket should be nonblocking. */
132 #define FLAG_TO_SET O_NONBLOCK
135 #define FLAG_TO_SET O_NDELAY
137 #define FLAG_TO_SET FNDELAY
141 if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
146 flags |= FLAG_TO_SET;
147 if (fcntl(new_fd, F_SETFL, flags) == -1) {
154 /* Socket should be closed on exec() */
156 result = flags = fcntl(new_fd, F_GETFD, 0);
159 result = fcntl( new_fd, F_SETFD, flags );
169 /* Connect to winbindd socket */
171 static int winbind_named_pipe_sock(const char *dir)
173 struct sockaddr_un sunaddr;
180 /* Check permissions on unix socket directory */
182 if (lstat(dir, &st) == -1) {
187 if (!S_ISDIR(st.st_mode) ||
188 (st.st_uid != 0 && st.st_uid != geteuid())) {
193 /* Connect to socket */
195 if (asprintf(&path, "%s/%s", dir, WINBINDD_SOCKET_NAME) < 0) {
199 ZERO_STRUCT(sunaddr);
200 sunaddr.sun_family = AF_UNIX;
201 strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
203 /* If socket file doesn't exist, don't bother trying to connect
204 with retry. This is an attempt to make the system usable when
205 the winbindd daemon is not running. */
207 if (lstat(path, &st) == -1) {
214 /* Check permissions on unix socket file */
216 if (!S_ISSOCK(st.st_mode) ||
217 (st.st_uid != 0 && st.st_uid != geteuid())) {
222 /* Connect to socket */
224 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
228 /* Set socket non-blocking and close on exec. */
230 if ((fd = make_safe_fd( fd)) == -1) {
234 for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
235 wait_time += slept) {
239 int connect_errno = 0;
242 if (wait_time >= CONNECT_TIMEOUT)
249 tv.tv_sec = CONNECT_TIMEOUT - wait_time;
252 ret = select(fd + 1, NULL, &w_fds, NULL, &tv);
255 errnosize = sizeof(connect_errno);
257 ret = getsockopt(fd, SOL_SOCKET,
258 SO_ERROR, &connect_errno, &errnosize);
260 if (ret >= 0 && connect_errno == 0) {
261 /* Connect succeed */
266 slept = CONNECT_TIMEOUT;
269 slept = rand() % 3 + 1;
288 static const char *winbindd_socket_dir(void)
290 #ifdef SOCKET_WRAPPER
293 env_dir = getenv(WINBINDD_SOCKET_DIR_ENVVAR);
299 return WINBINDD_SOCKET_DIR;
302 /* Connect to winbindd socket */
304 static int winbind_open_pipe_sock(int recursing, int need_priv)
306 #ifdef HAVE_UNIXSOCKET
307 static pid_t our_pid;
308 struct winbindd_request request;
309 struct winbindd_response response;
310 ZERO_STRUCT(request);
311 ZERO_STRUCT(response);
313 if (our_pid != getpid()) {
314 winbind_close_sock();
318 if ((need_priv != 0) && (is_privileged == 0)) {
319 winbind_close_sock();
322 if (winbindd_fd != -1) {
330 if ((winbindd_fd = winbind_named_pipe_sock(winbindd_socket_dir())) == -1) {
336 /* version-check the socket */
338 request.wb_flags = WBFLAG_RECURSE;
339 if ((winbindd_request_response(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
340 winbind_close_sock();
344 /* try and get priv pipe */
346 request.wb_flags = WBFLAG_RECURSE;
347 if (winbindd_request_response(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
349 if ((fd = winbind_named_pipe_sock((char *)response.extra_data.data)) != -1) {
356 if ((need_priv != 0) && (is_privileged == 0)) {
360 SAFE_FREE(response.extra_data.data);
365 #endif /* HAVE_UNIXSOCKET */
368 /* Write data to winbindd socket */
370 static int winbind_write_sock(void *buffer, int count, int recursing,
373 int result, nwritten;
375 /* Open connection to winbind daemon */
379 if (winbind_open_pipe_sock(recursing, need_priv) == -1) {
384 /* Write data to socket */
388 while(nwritten < count) {
392 /* Catch pipe close on other end by checking if a read()
393 call would not block by calling select(). */
396 FD_SET(winbindd_fd, &r_fds);
399 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
400 winbind_close_sock();
401 return -1; /* Select error */
404 /* Write should be OK if fd not available for reading */
406 if (FD_ISSET(winbindd_fd, &r_fds)) {
408 /* Pipe has closed on remote end */
410 winbind_close_sock();
416 result = write(winbindd_fd,
417 (char *)buffer + nwritten,
420 if ((result == -1) || (result == 0)) {
424 winbind_close_sock();
434 /* Read data from winbindd socket */
436 static int winbind_read_sock(void *buffer, int count)
439 int total_time = 0, selret;
441 if (winbindd_fd == -1) {
445 /* Read data from socket */
446 while(nread < count) {
450 /* Catch pipe close on other end by checking if a read()
451 call would not block by calling select(). */
454 FD_SET(winbindd_fd, &r_fds);
456 /* Wait for 5 seconds for a reply. May need to parameterise this... */
459 if ((selret = select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv)) == -1) {
460 winbind_close_sock();
461 return -1; /* Select error */
465 /* Not ready for read yet... */
466 if (total_time >= 30) {
468 winbind_close_sock();
475 if (FD_ISSET(winbindd_fd, &r_fds)) {
479 int result = read(winbindd_fd, (char *)buffer + nread,
482 if ((result == -1) || (result == 0)) {
484 /* Read failed. I think the only useful thing we
485 can do here is just return -1 and fail since the
486 transaction has failed half way through. */
488 winbind_close_sock();
502 static int winbindd_read_reply(struct winbindd_response *response)
504 int result1, result2 = 0;
510 /* Read fixed length response */
512 result1 = winbind_read_sock(response,
513 sizeof(struct winbindd_response));
518 /* We actually send the pointer value of the extra_data field from
519 the server. This has no meaning in the client's address space
520 so we clear it out. */
522 response->extra_data.data = NULL;
524 /* Read variable length response */
526 if (response->length > sizeof(struct winbindd_response)) {
527 int extra_data_len = response->length -
528 sizeof(struct winbindd_response);
530 /* Mallocate memory for extra data */
532 if (!(response->extra_data.data = malloc(extra_data_len))) {
536 result2 = winbind_read_sock(response->extra_data.data,
539 winbindd_free_response(response);
544 /* Return total amount of data read */
546 return result1 + result2;
550 * send simple types of requests
553 NSS_STATUS winbindd_send_request(int req_type, int need_priv,
554 struct winbindd_request *request)
556 struct winbindd_request lrequest;
558 /* Check for our tricky environment variable */
560 if (winbind_env_set()) {
561 return NSS_STATUS_NOTFOUND;
565 ZERO_STRUCT(lrequest);
569 /* Fill in request and send down pipe */
571 winbindd_init_request(request, req_type);
573 if (winbind_write_sock(request, sizeof(*request),
574 request->wb_flags & WBFLAG_RECURSE,
577 /* Set ENOENT for consistency. Required by some apps */
580 return NSS_STATUS_UNAVAIL;
583 if ((request->extra_len != 0) &&
584 (winbind_write_sock(request->extra_data.data,
586 request->wb_flags & WBFLAG_RECURSE,
589 /* Set ENOENT for consistency. Required by some apps */
592 return NSS_STATUS_UNAVAIL;
595 return NSS_STATUS_SUCCESS;
599 * Get results from winbindd request
602 NSS_STATUS winbindd_get_response(struct winbindd_response *response)
604 struct winbindd_response lresponse;
607 ZERO_STRUCT(lresponse);
608 response = &lresponse;
611 init_response(response);
614 if (winbindd_read_reply(response) == -1) {
615 /* Set ENOENT for consistency. Required by some apps */
618 return NSS_STATUS_UNAVAIL;
621 /* Throw away extra data if client didn't request it */
622 if (response == &lresponse) {
623 winbindd_free_response(response);
626 /* Copy reply data from socket */
627 if (response->result != WINBINDD_OK) {
628 return NSS_STATUS_NOTFOUND;
631 return NSS_STATUS_SUCCESS;
634 /* Handle simple types of requests */
636 NSS_STATUS winbindd_request_response(int req_type,
637 struct winbindd_request *request,
638 struct winbindd_response *response)
640 NSS_STATUS status = NSS_STATUS_UNAVAIL;
643 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
644 status = winbindd_send_request(req_type, 0, request);
645 if (status != NSS_STATUS_SUCCESS)
647 status = winbindd_get_response(response);
654 NSS_STATUS winbindd_priv_request_response(int req_type,
655 struct winbindd_request *request,
656 struct winbindd_response *response)
658 NSS_STATUS status = NSS_STATUS_UNAVAIL;
661 while ((status == NSS_STATUS_UNAVAIL) && (count < 10)) {
662 status = winbindd_send_request(req_type, 1, request);
663 if (status != NSS_STATUS_SUCCESS)
665 status = winbindd_get_response(response);