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 /* Make sure socket handle isn't stdin, stdout or stderr */
74 #define RECURSION_LIMIT 3
76 static int make_nonstd_fd_internals(int fd, int limit /* Recursion limiter */)
79 if (fd >= 0 && fd <= 2) {
81 if ((new_fd = fcntl(fd, F_DUPFD, 3)) == -1) {
99 /* use the program stack to hold our list of FDs to close */
100 new_fd = make_nonstd_fd_internals(new_fd, limit - 1);
108 static int make_safe_fd(int fd)
111 int new_fd = make_nonstd_fd_internals(fd, RECURSION_LIMIT);
116 /* Socket should be closed on exec() */
119 result = flags = fcntl(new_fd, F_GETFD, 0);
122 result = fcntl( new_fd, F_SETFD, flags );
132 /* Connect to winbindd socket */
134 static int winbind_named_pipe_sock(const char *dir)
136 struct sockaddr_un sunaddr;
141 /* Check permissions on unix socket directory */
143 if (lstat(dir, &st) == -1) {
147 if (!S_ISDIR(st.st_mode) ||
148 (st.st_uid != 0 && st.st_uid != geteuid())) {
152 /* Connect to socket */
154 strncpy(path, dir, sizeof(path) - 1);
155 path[sizeof(path) - 1] = '\0';
157 strncat(path, "/", sizeof(path) - 1 - strlen(path));
158 path[sizeof(path) - 1] = '\0';
160 strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1 - strlen(path));
161 path[sizeof(path) - 1] = '\0';
163 ZERO_STRUCT(sunaddr);
164 sunaddr.sun_family = AF_UNIX;
165 strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
167 /* If socket file doesn't exist, don't bother trying to connect
168 with retry. This is an attempt to make the system usable when
169 the winbindd daemon is not running. */
171 if (lstat(path, &st) == -1) {
175 /* Check permissions on unix socket file */
177 if (!S_ISSOCK(st.st_mode) ||
178 (st.st_uid != 0 && st.st_uid != geteuid())) {
182 /* Connect to socket */
184 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
188 if ((fd = make_safe_fd( fd)) == -1) {
192 if (connect(fd, (struct sockaddr *)&sunaddr,
193 sizeof(sunaddr)) == -1) {
194 DEBUG(10, ("error connecting to pipe socket: %s\n",
203 /* Connect to winbindd socket */
205 int winbind_open_pipe_sock(void)
207 #ifdef HAVE_UNIXSOCKET
208 static pid_t our_pid;
209 struct winbindd_request request;
210 struct winbindd_response response;
211 ZERO_STRUCT(request);
212 ZERO_STRUCT(response);
214 if (our_pid != getpid()) {
219 if (winbindd_fd != -1) {
223 if ((winbindd_fd = winbind_named_pipe_sock(WINBINDD_SOCKET_DIR)) == -1) {
227 /* version-check the socket */
229 if ((winbindd_request(WINBINDD_INTERFACE_VERSION, &request, &response) != NSS_STATUS_SUCCESS) || (response.data.interface_version != WINBIND_INTERFACE_VERSION)) {
234 /* try and get priv pipe */
236 if (winbindd_request(WINBINDD_PRIV_PIPE_DIR, &request, &response) == NSS_STATUS_SUCCESS) {
238 if ((fd = winbind_named_pipe_sock(response.extra_data)) != -1) {
244 SAFE_FREE(response.extra_data);
249 #endif /* HAVE_UNIXSOCKET */
252 /* Write data to winbindd socket */
254 int write_sock(void *buffer, int count)
256 int result, nwritten;
258 /* Open connection to winbind daemon */
262 if (winbind_open_pipe_sock() == -1) {
266 /* Write data to socket */
270 while(nwritten < count) {
274 /* Catch pipe close on other end by checking if a read()
275 call would not block by calling select(). */
278 FD_SET(winbindd_fd, &r_fds);
281 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
283 return -1; /* Select error */
286 /* Write should be OK if fd not available for reading */
288 if (!FD_ISSET(winbindd_fd, &r_fds)) {
292 result = write(winbindd_fd,
293 (char *)buffer + nwritten,
296 if ((result == -1) || (result == 0)) {
308 /* Pipe has closed on remote end */
318 /* Read data from winbindd socket */
320 static int read_sock(void *buffer, int count)
322 int result = 0, nread = 0;
324 /* Read data from socket */
326 while(nread < count) {
328 result = read(winbindd_fd, (char *)buffer + nread,
331 if ((result == -1) || (result == 0)) {
333 /* Read failed. I think the only useful thing we
334 can do here is just return -1 and fail since the
335 transaction has failed half way through. */
349 int read_reply(struct winbindd_response *response)
351 int result1, result2 = 0;
357 /* Read fixed length response */
359 if ((result1 = read_sock(response, sizeof(struct winbindd_response)))
365 /* We actually send the pointer value of the extra_data field from
366 the server. This has no meaning in the client's address space
367 so we clear it out. */
369 response->extra_data = NULL;
371 /* Read variable length response */
373 if (response->length > sizeof(struct winbindd_response)) {
374 int extra_data_len = response->length -
375 sizeof(struct winbindd_response);
377 /* Mallocate memory for extra data */
379 if (!(response->extra_data = malloc(extra_data_len))) {
383 if ((result2 = read_sock(response->extra_data, extra_data_len))
385 free_response(response);
390 /* Return total amount of data read */
392 return result1 + result2;
396 * send simple types of requests
399 NSS_STATUS winbindd_send_request(int req_type, struct winbindd_request *request)
401 struct winbindd_request lrequest;
405 /* Check for our tricky environment variable */
407 if ( (env = getenv(WINBINDD_DONT_ENV)) != NULL ) {
410 return NSS_STATUS_NOTFOUND;
414 ZERO_STRUCT(lrequest);
418 /* Fill in request and send down pipe */
420 init_request(request, req_type);
422 if (write_sock(request, sizeof(*request)) == -1) {
423 return NSS_STATUS_UNAVAIL;
426 return NSS_STATUS_SUCCESS;
430 * Get results from winbindd request
433 NSS_STATUS winbindd_get_response(struct winbindd_response *response)
435 struct winbindd_response lresponse;
438 ZERO_STRUCT(lresponse);
439 response = &lresponse;
442 init_response(response);
445 if (read_reply(response) == -1) {
446 return NSS_STATUS_UNAVAIL;
449 /* Throw away extra data if client didn't request it */
450 if (response == &lresponse) {
451 free_response(response);
454 /* Copy reply data from socket */
455 if (response->result != WINBINDD_OK) {
456 return NSS_STATUS_NOTFOUND;
459 return NSS_STATUS_SUCCESS;
462 /* Handle simple types of requests */
464 NSS_STATUS winbindd_request(int req_type,
465 struct winbindd_request *request,
466 struct winbindd_response *response)
470 status = winbindd_send_request(req_type, request);
471 if (status != NSS_STATUS_SUCCESS)
473 return winbindd_get_response(response);
476 /*************************************************************************
477 A couple of simple jfunctions to disable winbindd lookups and re-
479 ************************************************************************/
481 BOOL winbind_off( void )
483 return (setenv( WINBINDD_DONT_ENV, "1", 1 ) != -1);
486 BOOL winbind_on( void )
488 return (setenv( WINBINDD_DONT_ENV, "0", 1 ) != -1);