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 #define CONST_DISCARD(type, ptr) ((type) ((void *) (ptr)))
30 #define CONST_ADD(type, ptr) ((type) ((const void *) (ptr)))
32 /* Global variables. These are effectively the client state information */
34 int winbindd_fd = -1; /* fd for winbindd socket */
36 /* Free a response structure */
38 void free_response(struct winbindd_response *response)
40 /* Free any allocated extra_data */
43 SAFE_FREE(response->extra_data);
46 /* Initialise a request structure */
48 void init_request(struct winbindd_request *request, int request_type)
50 request->length = sizeof(struct winbindd_request);
52 request->cmd = (enum winbindd_cmd)request_type;
53 request->pid = getpid();
57 /* Initialise a response structure */
59 void init_response(struct winbindd_response *response)
61 /* Initialise return value */
63 response->result = WINBINDD_ERROR;
66 /* Close established socket */
70 if (winbindd_fd != -1) {
76 #define CONNECT_TIMEOUT 30
77 #define WRITE_TIMEOUT CONNECT_TIMEOUT
78 #define READ_TIMEOUT CONNECT_TIMEOUT
80 /* Make sure socket handle isn't stdin, stdout or stderr */
81 #define RECURSION_LIMIT 3
83 static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
86 if (fd >= 0 && fd <= 2) {
88 if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
106 /* use the program stack to hold our list of FDs to close */
107 new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
115 /****************************************************************************
116 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
120 Set close on exec also.
121 ****************************************************************************/
123 static int make_safe_fd(int fd)
126 int new_fd = make_nonstd_fd_internals(fd, RECURSION_LIMIT);
132 /* Socket should be nonblocking. */
134 #define FLAG_TO_SET O_NONBLOCK
137 #define FLAG_TO_SET O_NDELAY
139 #define FLAG_TO_SET FNDELAY
143 if ((flags = fcntl(new_fd, F_GETFL)) == -1) {
148 flags |= FLAG_TO_SET;
149 if (fcntl(new_fd, F_SETFL, flags) == -1) {
156 /* Socket should be closed on exec() */
158 result = flags = fcntl(new_fd, F_GETFD, 0);
161 result = fcntl( new_fd, F_SETFD, flags );
171 /* Connect to winbindd socket */
173 static int winbind_named_pipe_sock(const char *dir)
175 struct sockaddr_un sunaddr;
182 /* Check permissions on unix socket directory */
184 if (lstat(dir, &st) == -1) {
188 if (!S_ISDIR(st.st_mode) ||
189 (st.st_uid != 0 && st.st_uid != geteuid())) {
193 /* Connect to socket */
195 strncpy(path, dir, sizeof(path) - 1);
196 path[sizeof(path) - 1] = '\0';
198 strncat(path, "/", sizeof(path) - 1 - strlen(path));
199 path[sizeof(path) - 1] = '\0';
201 strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1 - strlen(path));
202 path[sizeof(path) - 1] = '\0';
204 ZERO_STRUCT(sunaddr);
205 sunaddr.sun_family = AF_UNIX;
206 strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
208 /* If socket file doesn't exist, don't bother trying to connect
209 with retry. This is an attempt to make the system usable when
210 the winbindd daemon is not running. */
212 if (lstat(path, &st) == -1) {
216 /* Check permissions on unix socket file */
218 if (!S_ISSOCK(st.st_mode) ||
219 (st.st_uid != 0 && st.st_uid != geteuid())) {
223 /* Connect to socket */
225 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
229 /* Set socket non-blocking and close on exec. */
231 if ((fd = make_safe_fd( fd)) == -1) {
235 for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
236 wait_time += slept) {
240 int connect_errno = 0, errnosize;
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;
287 if (connect(fd, (struct sockaddr *)&sunaddr,
288 sizeof(sunaddr)) == -1) {
296 /* Connect to winbindd socket */
298 int winbind_open_pipe_sock(void)
300 #ifdef HAVE_UNIXSOCKET
301 static pid_t our_pid;
302 struct winbindd_request request;
303 struct winbindd_response response;
304 ZERO_STRUCT(request);
305 ZERO_STRUCT(response);
307 if (our_pid != getpid()) {
312 if (winbindd_fd != -1) {
316 if ((winbindd_fd = winbind_named_pipe_sock(WINBINDD_SOCKET_DIR)) == -1) {
320 /* version-check the socket */
322 if ((winbindd_request(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
327 /* try and get priv pipe */
329 if (winbindd_request(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
331 if ((fd = winbind_named_pipe_sock(response.extra_data)) != -1) {
337 SAFE_FREE(response.extra_data);
342 #endif /* HAVE_UNIXSOCKET */
345 /* Write data to winbindd socket */
347 int write_sock(void *buffer, int count)
349 int result, nwritten;
351 /* Open connection to winbind daemon */
355 if (winbind_open_pipe_sock() == -1) {
359 /* Write data to socket */
363 while(nwritten < count) {
367 /* Catch pipe close on other end by checking if a read()
368 call would not block by calling select(). */
371 FD_SET(winbindd_fd, &r_fds);
374 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
376 return -1; /* Select error */
379 /* Write should be OK if fd not available for reading */
381 if (!FD_ISSET(winbindd_fd, &r_fds)) {
385 result = write(winbindd_fd,
386 (char *)buffer + nwritten,
389 if ((result == -1) || (result == 0)) {
401 /* Pipe has closed on remote end */
411 /* Read data from winbindd socket */
413 static int read_sock(void *buffer, int count)
415 int result = 0, nread = 0;
416 int total_time = 0, selret;
418 /* Read data from socket */
419 while(nread < count) {
423 /* Catch pipe close on other end by checking if a read()
424 call would not block by calling select(). */
427 FD_SET(winbindd_fd, &r_fds);
429 /* Wait for 5 seconds for a reply. May need to parameterise this... */
432 if ((selret = select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv)) == -1) {
434 return -1; /* Select error */
438 /* Not ready for read yet... */
439 if (total_time >= 30) {
448 if (FD_ISSET(winbindd_fd, &r_fds)) {
452 result = read(winbindd_fd, (char *)buffer + nread,
455 if ((result == -1) || (result == 0)) {
457 /* Read failed. I think the only useful thing we
458 can do here is just return -1 and fail since the
459 transaction has failed half way through. */
475 int read_reply(struct winbindd_response *response)
477 int result1, result2 = 0;
483 /* Read fixed length response */
485 if ((result1 = read_sock(response, sizeof(struct winbindd_response)))
491 /* We actually send the pointer value of the extra_data field from
492 the server. This has no meaning in the client's address space
493 so we clear it out. */
495 response->extra_data = NULL;
497 /* Read variable length response */
499 if (response->length > sizeof(struct winbindd_response)) {
500 int extra_data_len = response->length -
501 sizeof(struct winbindd_response);
503 /* Mallocate memory for extra data */
505 if (!(response->extra_data = malloc(extra_data_len))) {
509 if ((result2 = read_sock(response->extra_data, extra_data_len))
511 free_response(response);
516 /* Return total amount of data read */
518 return result1 + result2;
522 * send simple types of requests
525 NSS_STATUS winbindd_send_request(int req_type, struct winbindd_request *request)
527 struct winbindd_request lrequest;
531 /* Check for our tricky environment variable */
533 if ( (env = getenv(WINBINDD_DONT_ENV)) != NULL ) {
536 return NSS_STATUS_NOTFOUND;
540 ZERO_STRUCT(lrequest);
544 /* Fill in request and send down pipe */
546 init_request(request, req_type);
548 if (write_sock(request, sizeof(*request)) == -1) {
549 return NSS_STATUS_UNAVAIL;
552 return NSS_STATUS_SUCCESS;
556 * Get results from winbindd request
559 NSS_STATUS winbindd_get_response(struct winbindd_response *response)
561 struct winbindd_response lresponse;
564 ZERO_STRUCT(lresponse);
565 response = &lresponse;
568 init_response(response);
571 if (read_reply(response) == -1) {
572 return NSS_STATUS_UNAVAIL;
575 /* Throw away extra data if client didn't request it */
576 if (response == &lresponse) {
577 free_response(response);
580 /* Copy reply data from socket */
581 if (response->result != WINBINDD_OK) {
582 return NSS_STATUS_NOTFOUND;
585 return NSS_STATUS_SUCCESS;
588 /* Handle simple types of requests */
590 NSS_STATUS winbindd_request(int req_type,
591 struct winbindd_request *request,
592 struct winbindd_response *response)
596 status = winbindd_send_request(req_type, request);
597 if (status != NSS_STATUS_SUCCESS)
599 return winbindd_get_response(response);
602 /*************************************************************************
603 A couple of simple functions to disable winbindd lookups and re-
605 ************************************************************************/
607 /* Use putenv() instead of setenv() in these functions as not all
608 environments have the latter. */
610 BOOL winbind_off( void )
612 static char *s = CONST_DISCARD(char *, WINBINDD_DONT_ENV "=1");
614 return putenv(s) != -1;
617 BOOL winbind_on( void )
619 static char *s = CONST_DISCARD(char *, WINBINDD_DONT_ENV "=0");
621 return putenv(s) != -1;