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 int winbind_open_pipe_sock(void)
136 #ifdef HAVE_UNIXSOCKET
137 struct sockaddr_un sunaddr;
138 static pid_t our_pid;
143 if (our_pid != getpid()) {
148 if (winbindd_fd != -1) {
152 /* Check permissions on unix socket directory */
154 if (lstat(WINBINDD_SOCKET_DIR, &st) == -1) {
158 if (!S_ISDIR(st.st_mode) ||
159 (st.st_uid != 0 && st.st_uid != geteuid())) {
163 /* Connect to socket */
165 strncpy(path, WINBINDD_SOCKET_DIR, sizeof(path) - 1);
166 path[sizeof(path) - 1] = '\0';
168 strncat(path, "/", sizeof(path) - 1);
169 path[sizeof(path) - 1] = '\0';
171 strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1);
172 path[sizeof(path) - 1] = '\0';
174 ZERO_STRUCT(sunaddr);
175 sunaddr.sun_family = AF_UNIX;
176 strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
178 /* If socket file doesn't exist, don't bother trying to connect
179 with retry. This is an attempt to make the system usable when
180 the winbindd daemon is not running. */
182 if (lstat(path, &st) == -1) {
186 /* Check permissions on unix socket file */
188 if (!S_ISSOCK(st.st_mode) ||
189 (st.st_uid != 0 && st.st_uid != geteuid())) {
193 /* Connect to socket */
195 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
199 if ((winbindd_fd = make_safe_fd( fd)) == -1) {
203 if (connect(winbindd_fd, (struct sockaddr *)&sunaddr,
204 sizeof(sunaddr)) == -1) {
212 #endif /* HAVE_UNIXSOCKET */
215 /* Write data to winbindd socket */
217 int write_sock(void *buffer, int count)
219 int result, nwritten;
221 /* Open connection to winbind daemon */
225 if (winbind_open_pipe_sock() == -1) {
229 /* Write data to socket */
233 while(nwritten < count) {
237 /* Catch pipe close on other end by checking if a read()
238 call would not block by calling select(). */
241 FD_SET(winbindd_fd, &r_fds);
244 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
246 return -1; /* Select error */
249 /* Write should be OK if fd not available for reading */
251 if (!FD_ISSET(winbindd_fd, &r_fds)) {
255 result = write(winbindd_fd,
256 (char *)buffer + nwritten,
259 if ((result == -1) || (result == 0)) {
271 /* Pipe has closed on remote end */
281 /* Read data from winbindd socket */
283 static int read_sock(void *buffer, int count)
285 int result = 0, nread = 0;
287 /* Read data from socket */
289 while(nread < count) {
291 result = read(winbindd_fd, (char *)buffer + nread,
294 if ((result == -1) || (result == 0)) {
296 /* Read failed. I think the only useful thing we
297 can do here is just return -1 and fail since the
298 transaction has failed half way through. */
312 int read_reply(struct winbindd_response *response)
314 int result1, result2 = 0;
320 /* Read fixed length response */
322 if ((result1 = read_sock(response, sizeof(struct winbindd_response)))
328 /* We actually send the pointer value of the extra_data field from
329 the server. This has no meaning in the client's address space
330 so we clear it out. */
332 response->extra_data = NULL;
334 /* Read variable length response */
336 if (response->length > sizeof(struct winbindd_response)) {
337 int extra_data_len = response->length -
338 sizeof(struct winbindd_response);
340 /* Mallocate memory for extra data */
342 if (!(response->extra_data = malloc(extra_data_len))) {
346 if ((result2 = read_sock(response->extra_data, extra_data_len))
348 free_response(response);
353 /* Return total amount of data read */
355 return result1 + result2;
359 * send simple types of requests
362 NSS_STATUS winbindd_send_request(int req_type, struct winbindd_request *request)
364 struct winbindd_request lrequest;
366 /* Check for our tricky environment variable */
368 if (getenv(WINBINDD_DONT_ENV)) {
369 return NSS_STATUS_NOTFOUND;
373 ZERO_STRUCT(lrequest);
377 /* Fill in request and send down pipe */
379 init_request(request, req_type);
381 if (write_sock(request, sizeof(*request)) == -1) {
382 return NSS_STATUS_UNAVAIL;
385 return NSS_STATUS_SUCCESS;
389 * Get results from winbindd request
392 NSS_STATUS winbindd_get_response(struct winbindd_response *response)
394 struct winbindd_response lresponse;
397 ZERO_STRUCT(lresponse);
398 response = &lresponse;
401 init_response(response);
404 if (read_reply(response) == -1) {
405 return NSS_STATUS_UNAVAIL;
408 /* Throw away extra data if client didn't request it */
409 if (response == &lresponse) {
410 free_response(response);
413 /* Copy reply data from socket */
414 if (response->result != WINBINDD_OK) {
415 return NSS_STATUS_NOTFOUND;
418 return NSS_STATUS_SUCCESS;
421 /* Handle simple types of requests */
423 NSS_STATUS winbindd_request(int req_type,
424 struct winbindd_request *request,
425 struct winbindd_response *response)
429 status = winbindd_send_request(req_type, request);
430 if (status != NSS_STATUS_SUCCESS)
432 return winbindd_get_response(response);