2 Unix SMB/CIFS implementation.
4 winbind client common code
6 Copyright (C) Tim Potter 2000
7 Copyright (C) Andrew Tridgell 2000
9 This library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Library General Public
11 License as published by the Free Software Foundation; either
12 version 2 of the License, or (at your option) any later version.
14 This library is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Library General Public License for more details.
19 You should have received a copy of the GNU Library General Public
20 License along with this library; if not, write to the
21 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA.
25 #include "winbind_nss_config.h"
26 #include "winbindd_nss.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);
42 /* Initialise a request structure */
44 void init_request(struct winbindd_request *request, int request_type)
46 static char *domain_env;
47 static BOOL initialised;
49 request->length = sizeof(struct winbindd_request);
51 request->cmd = (enum winbindd_cmd)request_type;
52 request->pid = getpid();
53 request->domain[0] = '\0';
57 domain_env = getenv(WINBINDD_DOMAIN_ENV);
61 strncpy(request->domain, domain_env,
62 sizeof(request->domain) - 1);
63 request->domain[sizeof(request->domain) - 1] = '\0';
67 /* Initialise a response structure */
69 void init_response(struct winbindd_response *response)
71 /* Initialise return value */
73 response->result = WINBINDD_ERROR;
76 /* Close established socket */
78 static void close_sock(void)
80 if (winbindd_fd != -1) {
86 /* Connect to winbindd socket */
88 int winbind_open_pipe_sock(void)
90 struct sockaddr_un sunaddr;
95 if (our_pid != getpid()) {
100 if (winbindd_fd != -1) {
104 /* Check permissions on unix socket directory */
106 if (lstat(WINBINDD_SOCKET_DIR, &st) == -1) {
110 if (!S_ISDIR(st.st_mode) ||
111 (st.st_uid != 0 && st.st_uid != geteuid())) {
115 /* Connect to socket */
117 strncpy(path, WINBINDD_SOCKET_DIR, sizeof(path) - 1);
118 path[sizeof(path) - 1] = '\0';
120 strncat(path, "/", sizeof(path) - 1);
121 path[sizeof(path) - 1] = '\0';
123 strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1);
124 path[sizeof(path) - 1] = '\0';
126 ZERO_STRUCT(sunaddr);
127 sunaddr.sun_family = AF_UNIX;
128 strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
130 /* If socket file doesn't exist, don't bother trying to connect
131 with retry. This is an attempt to make the system usable when
132 the winbindd daemon is not running. */
134 if (lstat(path, &st) == -1) {
138 /* Check permissions on unix socket file */
140 if (!S_ISSOCK(st.st_mode) ||
141 (st.st_uid != 0 && st.st_uid != geteuid())) {
145 /* Connect to socket */
147 if ((winbindd_fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
151 if (connect(winbindd_fd, (struct sockaddr *)&sunaddr,
152 sizeof(sunaddr)) == -1) {
160 /* Write data to winbindd socket */
162 int write_sock(void *buffer, int count)
164 int result, nwritten;
166 /* Open connection to winbind daemon */
170 if (winbind_open_pipe_sock() == -1) {
174 /* Write data to socket */
178 while(nwritten < count) {
182 /* Catch pipe close on other end by checking if a read()
183 call would not block by calling select(). */
186 FD_SET(winbindd_fd, &r_fds);
189 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
191 return -1; /* Select error */
194 /* Write should be OK if fd not available for reading */
196 if (!FD_ISSET(winbindd_fd, &r_fds)) {
200 result = write(winbindd_fd,
201 (char *)buffer + nwritten,
204 if ((result == -1) || (result == 0)) {
216 /* Pipe has closed on remote end */
226 /* Read data from winbindd socket */
228 static int read_sock(void *buffer, int count)
230 int result = 0, nread = 0;
232 /* Read data from socket */
234 while(nread < count) {
236 result = read(winbindd_fd, (char *)buffer + nread,
239 if ((result == -1) || (result == 0)) {
241 /* Read failed. I think the only useful thing we
242 can do here is just return -1 and fail since the
243 transaction has failed half way through. */
257 int read_reply(struct winbindd_response *response)
259 int result1, result2 = 0;
265 /* Read fixed length response */
267 if ((result1 = read_sock(response, sizeof(struct winbindd_response)))
273 /* We actually send the pointer value of the extra_data field from
274 the server. This has no meaning in the client's address space
275 so we clear it out. */
277 response->extra_data = NULL;
279 /* Read variable length response */
281 if (response->length > sizeof(struct winbindd_response)) {
282 int extra_data_len = response->length -
283 sizeof(struct winbindd_response);
285 /* Mallocate memory for extra data */
287 if (!(response->extra_data = malloc(extra_data_len))) {
291 if ((result2 = read_sock(response->extra_data, extra_data_len))
293 free_response(response);
298 /* Return total amount of data read */
300 return result1 + result2;
304 * send simple types of requests
307 NSS_STATUS winbindd_send_request(int req_type, struct winbindd_request *request)
309 struct winbindd_request lrequest;
311 /* Check for our tricky environment variable */
313 if (getenv(WINBINDD_DONT_ENV)) {
314 return NSS_STATUS_NOTFOUND;
318 ZERO_STRUCT(lrequest);
322 /* Fill in request and send down pipe */
324 init_request(request, req_type);
326 if (write_sock(request, sizeof(*request)) == -1) {
327 return NSS_STATUS_UNAVAIL;
330 return NSS_STATUS_SUCCESS;
334 * Get results from winbindd request
337 NSS_STATUS winbindd_get_response(struct winbindd_response *response)
339 struct winbindd_response lresponse;
342 ZERO_STRUCT(lresponse);
343 response = &lresponse;
346 init_response(response);
349 if (read_reply(response) == -1) {
350 return NSS_STATUS_UNAVAIL;
353 /* Throw away extra data if client didn't request it */
354 if (response == &lresponse) {
355 free_response(response);
358 /* Copy reply data from socket */
359 if (response->result != WINBINDD_OK) {
360 return NSS_STATUS_NOTFOUND;
363 return NSS_STATUS_SUCCESS;
366 /* Handle simple types of requests */
368 NSS_STATUS winbindd_request(int req_type,
369 struct winbindd_request *request,
370 struct winbindd_response *response)
374 status = winbindd_send_request(req_type, request);
375 if (status != NSS_STATUS_SUCCESS)
377 return winbindd_get_response(response);