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/>.
26 #include "nsswitch/winbind_client.h"
28 /* Global variables. These are effectively the client state information */
30 int winbindd_fd = -1; /* fd for winbindd socket */
32 /* Free a response structure */
34 void 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 void init_request(struct winbindd_request *request, int request_type)
46 request->length = sizeof(struct winbindd_request);
48 request->cmd = (enum winbindd_cmd)request_type;
49 request->pid = getpid();
53 /* Initialise a response structure */
55 void init_response(struct winbindd_response *response)
57 /* Initialise return value */
59 response->result = WINBINDD_ERROR;
62 /* Close established socket */
66 if (winbindd_fd != -1) {
72 #define CONNECT_TIMEOUT 30
74 #define WRITE_TIMEOUT CONNECT_TIMEOUT
75 #define READ_TIMEOUT CONNECT_TIMEOUT
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) {
186 if (!S_ISDIR(st.st_mode) ||
187 (st.st_uid != 0 && st.st_uid != geteuid())) {
191 /* Connect to socket */
193 asprintf(&path, "%s%s", dir, "/" WINBINDD_SOCKET_NAME);
194 ZERO_STRUCT(sunaddr);
195 sunaddr.sun_family = AF_UNIX;
196 strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
198 /* If socket file doesn't exist, don't bother trying to connect
199 with retry. This is an attempt to make the system usable when
200 the winbindd daemon is not running. */
202 if (lstat(path, &st) == -1) {
209 /* Check permissions on unix socket file */
211 if (!S_ISSOCK(st.st_mode) ||
212 (st.st_uid != 0 && st.st_uid != geteuid())) {
216 /* Connect to socket */
218 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
222 /* Set socket non-blocking and close on exec. */
224 if ((fd = make_safe_fd( fd)) == -1) {
228 for (wait_time = 0; connect(fd, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1;
229 wait_time += slept) {
233 int connect_errno = 0;
236 if (wait_time >= CONNECT_TIMEOUT)
243 tv.tv_sec = CONNECT_TIMEOUT - wait_time;
246 ret = select(fd + 1, NULL, &w_fds, NULL, &tv);
249 errnosize = sizeof(connect_errno);
251 ret = getsockopt(fd, SOL_SOCKET,
252 SO_ERROR, &connect_errno, &errnosize);
254 if (ret >= 0 && connect_errno == 0) {
255 /* Connect succeed */
260 slept = CONNECT_TIMEOUT;
263 slept = rand() % 3 + 1;
281 if (connect(fd, (struct sockaddr *)&sunaddr,
282 sizeof(sunaddr)) == -1) {
290 /* Connect to winbindd socket */
292 int winbind_open_pipe_sock(void)
294 #ifdef HAVE_UNIXSOCKET
295 static pid_t our_pid;
296 struct winbindd_request request;
297 struct winbindd_response response;
298 const char *winbindd_socket_dir_env;
299 ZERO_STRUCT(request);
300 ZERO_STRUCT(response);
302 if (our_pid != getpid()) {
307 if (winbindd_fd != -1) {
311 #ifdef SOCKET_WRAPPER
312 winbindd_socket_dir_env = getenv(WINBINDD_SOCKET_DIR_ENV);
314 if (!winbindd_socket_dir_env)
316 winbindd_socket_dir_env = WINBINDD_SOCKET_DIR;
319 winbindd_socket_dir_env = WINBINDD_SOCKET_DIR;
322 winbindd_fd = winbind_named_pipe_sock(winbindd_socket_dir_env);
324 if (winbindd_fd == -1)
329 /* version-check the socket */
331 if ((winbindd_request(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
336 /* try and get priv pipe */
338 if (winbindd_request(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
340 if ((fd = winbind_named_pipe_sock(response.extra_data.data)) != -1) {
346 SAFE_FREE(response.extra_data.data);
351 #endif /* HAVE_UNIXSOCKET */
354 /* Write data to winbindd socket */
356 int write_sock(void *buffer, int count)
358 int result, nwritten;
360 /* Open connection to winbind daemon */
364 if (winbind_open_pipe_sock() == -1) {
368 /* Write data to socket */
372 while(nwritten < count) {
376 /* Catch pipe close on other end by checking if a read()
377 call would not block by calling select(). */
380 FD_SET(winbindd_fd, &r_fds);
383 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
385 return -1; /* Select error */
388 /* Write should be OK if fd not available for reading */
390 if (!FD_ISSET(winbindd_fd, &r_fds)) {
394 result = write(winbindd_fd,
395 (char *)buffer + nwritten,
398 if ((result == -1) || (result == 0)) {
410 /* Pipe has closed on remote end */
420 /* Read data from winbindd socket */
422 static int read_sock(void *buffer, int count)
425 int total_time = 0, selret;
427 /* Read data from socket */
428 while(nread < count) {
432 /* Catch pipe close on other end by checking if a read()
433 call would not block by calling select(). */
436 FD_SET(winbindd_fd, &r_fds);
438 /* Wait for 5 seconds for a reply. May need to parameterise this... */
441 if ((selret = select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv)) == -1) {
443 return -1; /* Select error */
447 /* Not ready for read yet... */
448 if (total_time >= 30) {
457 if (FD_ISSET(winbindd_fd, &r_fds)) {
461 int result = read(winbindd_fd, (char *)buffer + nread,
464 if ((result == -1) || (result == 0)) {
466 /* Read failed. I think the only useful thing we
467 can do here is just return -1 and fail since the
468 transaction has failed half way through. */
484 int read_reply(struct winbindd_response *response)
486 int result1, result2 = 0;
492 /* Read fixed length response */
494 if ((result1 = read_sock(response, sizeof(struct winbindd_response)))
500 /* We actually send the pointer value of the extra_data field from
501 the server. This has no meaning in the client's address space
502 so we clear it out. */
504 response->extra_data.data = NULL;
506 /* Read variable length response */
508 if (response->length > sizeof(struct winbindd_response)) {
509 int extra_data_len = response->length -
510 sizeof(struct winbindd_response);
512 /* Mallocate memory for extra data */
514 if (!(response->extra_data.data = malloc(extra_data_len))) {
518 if ((result2 = read_sock(response->extra_data.data, extra_data_len))
520 free_response(response);
525 /* Return total amount of data read */
527 return result1 + result2;
531 * send simple types of requests
534 NSS_STATUS winbindd_send_request(int req_type, struct winbindd_request *request)
536 struct winbindd_request lrequest;
540 /* Check for our tricky environment variable */
542 if ( (env = getenv(WINBINDD_DONT_ENV)) != NULL ) {
545 return NSS_STATUS_NOTFOUND;
549 ZERO_STRUCT(lrequest);
553 /* Fill in request and send down pipe */
555 init_request(request, req_type);
557 if (write_sock(request, sizeof(*request)) == -1) {
558 return NSS_STATUS_UNAVAIL;
561 return NSS_STATUS_SUCCESS;
565 * Get results from winbindd request
568 NSS_STATUS winbindd_get_response(struct winbindd_response *response)
570 struct winbindd_response lresponse;
573 ZERO_STRUCT(lresponse);
574 response = &lresponse;
577 init_response(response);
580 if (read_reply(response) == -1) {
581 return NSS_STATUS_UNAVAIL;
584 /* Throw away extra data if client didn't request it */
585 if (response == &lresponse) {
586 free_response(response);
589 /* Copy reply data from socket */
590 if (response->result != WINBINDD_OK) {
591 return NSS_STATUS_NOTFOUND;
594 return NSS_STATUS_SUCCESS;
597 /* Handle simple types of requests */
599 NSS_STATUS winbindd_request(int req_type,
600 struct winbindd_request *request,
601 struct winbindd_response *response)
605 status = winbindd_send_request(req_type, request);
606 if (status != NSS_STATUS_SUCCESS)
608 return winbindd_get_response(response);
611 /*************************************************************************
612 A couple of simple functions to disable winbindd lookups and re-
614 ************************************************************************/
616 bool winbind_off( void )
618 setenv(WINBINDD_DONT_ENV, "1", 1);
622 bool winbind_on( void )
624 setenv(WINBINDD_DONT_ENV, "0", 1);