2 Unix SMB/Netbios implementation.
5 winbind client common code
7 Copyright (C) Tim Potter 2000
8 Copyright (C) Andrew Tridgell 2000
10 This library is free software; you can redistribute it and/or
11 modify it under the terms of the GNU Library General Public
12 License as published by the Free Software Foundation; either
13 version 2 of the License, or (at your option) any later version.
15 This library is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Library General Public License for more details.
20 You should have received a copy of the GNU Library General Public
21 License along with this library; if not, write to the
22 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA.
26 #include "winbind_nss_config.h"
27 #include "winbindd_nss.h"
29 /* Global variables. These are effectively the client state information */
31 int winbindd_fd = -1; /* fd for winbindd socket */
32 static char *excluded_domain;
34 /* Free a response structure */
36 void free_response(struct winbindd_response *response)
38 /* Free any allocated extra_data */
41 SAFE_FREE(response->extra_data);
45 smbd needs to be able to exclude lookups for its own domain
47 void winbind_exclude_domain(const char *domain)
49 SAFE_FREE(excluded_domain);
50 excluded_domain = strdup(domain);
54 /* Initialise a request structure */
56 void init_request(struct winbindd_request *request, int request_type)
58 static char *domain_env;
59 static BOOL initialised;
61 request->length = sizeof(struct winbindd_request);
63 request->cmd = (enum winbindd_cmd)request_type;
64 request->pid = getpid();
65 request->domain[0] = '\0';
69 domain_env = getenv(WINBINDD_DOMAIN_ENV);
73 strncpy(request->domain, domain_env,
74 sizeof(request->domain) - 1);
75 request->domain[sizeof(request->domain) - 1] = '\0';
79 /* Initialise a response structure */
81 void init_response(struct winbindd_response *response)
83 /* Initialise return value */
85 response->result = WINBINDD_ERROR;
88 /* Close established socket */
92 if (winbindd_fd != -1) {
98 /* Connect to winbindd socket */
100 int winbind_open_pipe_sock(void)
102 struct sockaddr_un sunaddr;
103 static pid_t our_pid;
107 if (our_pid != getpid()) {
112 if (winbindd_fd != -1) {
116 /* Check permissions on unix socket directory */
118 if (lstat(WINBINDD_SOCKET_DIR, &st) == -1) {
122 if (!S_ISDIR(st.st_mode) ||
123 (st.st_uid != 0 && st.st_uid != geteuid())) {
127 /* Connect to socket */
129 strncpy(path, WINBINDD_SOCKET_DIR, sizeof(path) - 1);
130 path[sizeof(path) - 1] = '\0';
132 strncat(path, "/", sizeof(path) - 1);
133 path[sizeof(path) - 1] = '\0';
135 strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1);
136 path[sizeof(path) - 1] = '\0';
138 ZERO_STRUCT(sunaddr);
139 sunaddr.sun_family = AF_UNIX;
140 strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
142 /* If socket file doesn't exist, don't bother trying to connect
143 with retry. This is an attempt to make the system usable when
144 the winbindd daemon is not running. */
146 if (lstat(path, &st) == -1) {
150 /* Check permissions on unix socket file */
152 if (!S_ISSOCK(st.st_mode) ||
153 (st.st_uid != 0 && st.st_uid != geteuid())) {
157 /* Connect to socket */
159 if ((winbindd_fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
163 if (connect(winbindd_fd, (struct sockaddr *)&sunaddr,
164 sizeof(sunaddr)) == -1) {
172 /* Write data to winbindd socket with timeout */
174 int write_sock(void *buffer, int count)
176 int result, nwritten;
178 /* Open connection to winbind daemon */
182 if (winbind_open_pipe_sock() == -1) {
186 /* Write data to socket */
190 while(nwritten < count) {
194 /* Catch pipe close on other end by checking if a read()
195 call would not block by calling select(). */
198 FD_SET(winbindd_fd, &r_fds);
201 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
203 return -1; /* Select error */
206 /* Write should be OK if fd not available for reading */
208 if (!FD_ISSET(winbindd_fd, &r_fds)) {
212 result = write(winbindd_fd,
213 (char *)buffer + nwritten,
216 if ((result == -1) || (result == 0)) {
228 /* Pipe has closed on remote end */
238 /* Read data from winbindd socket with timeout */
240 static int read_sock(void *buffer, int count)
242 int result = 0, nread = 0;
244 /* Read data from socket */
246 while(nread < count) {
248 result = read(winbindd_fd, (char *)buffer + nread,
251 if ((result == -1) || (result == 0)) {
253 /* Read failed. I think the only useful thing we
254 can do here is just return -1 and fail since the
255 transaction has failed half way through. */
269 int read_reply(struct winbindd_response *response)
271 int result1, result2 = 0;
277 /* Read fixed length response */
279 if ((result1 = read_sock(response, sizeof(struct winbindd_response)))
285 /* We actually send the pointer value of the extra_data field from
286 the server. This has no meaning in the client's address space
287 so we clear it out. */
289 response->extra_data = NULL;
291 /* Read variable length response */
293 if (response->length > sizeof(struct winbindd_response)) {
294 int extra_data_len = response->length -
295 sizeof(struct winbindd_response);
297 /* Mallocate memory for extra data */
299 if (!(response->extra_data = malloc(extra_data_len))) {
303 if ((result2 = read_sock(response->extra_data, extra_data_len))
305 free_response(response);
310 /* Return total amount of data read */
312 return result1 + result2;
316 * send simple types of requests
319 NSS_STATUS winbindd_send_request(int req_type, struct winbindd_request *request)
321 struct winbindd_request lrequest;
323 /* Check for our tricky environment variable */
325 if (getenv(WINBINDD_DONT_ENV)) {
326 return NSS_STATUS_NOTFOUND;
329 /* smbd may have excluded this domain */
330 if (excluded_domain &&
331 strcasecmp(excluded_domain, request->domain) == 0) {
332 return NSS_STATUS_NOTFOUND;
336 ZERO_STRUCT(lrequest);
340 /* Fill in request and send down pipe */
342 init_request(request, req_type);
344 if (write_sock(request, sizeof(*request)) == -1) {
345 return NSS_STATUS_UNAVAIL;
348 return NSS_STATUS_SUCCESS;
352 * Get results from winbindd request
355 NSS_STATUS winbindd_get_response(struct winbindd_response *response)
357 struct winbindd_response lresponse;
360 ZERO_STRUCT(lresponse);
361 response = &lresponse;
364 init_response(response);
367 if (read_reply(response) == -1) {
368 return NSS_STATUS_UNAVAIL;
371 /* Throw away extra data if client didn't request it */
372 if (response == &lresponse) {
373 free_response(response);
376 /* Copy reply data from socket */
377 if (response->result != WINBINDD_OK) {
378 return NSS_STATUS_NOTFOUND;
381 return NSS_STATUS_SUCCESS;
384 /* Handle simple types of requests */
386 NSS_STATUS winbindd_request(int req_type,
387 struct winbindd_request *request,
388 struct winbindd_response *response)
392 status = winbindd_send_request(req_type, request);
393 if (status != NSS_STATUS_SUCCESS)
395 return winbindd_get_response(response);