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->cmd = (enum winbindd_cmd)request_type;
62 request->pid = getpid();
63 request->domain[0] = '\0';
67 domain_env = getenv(WINBINDD_DOMAIN_ENV);
71 strncpy(request->domain, domain_env,
72 sizeof(request->domain) - 1);
73 request->domain[sizeof(request->domain) - 1] = '\0';
77 /* Initialise a response structure */
79 void init_response(struct winbindd_response *response)
81 /* Initialise return value */
83 response->result = WINBINDD_ERROR;
86 /* Close established socket */
90 if (winbindd_fd != -1) {
96 /* Connect to winbindd socket */
98 int winbind_open_pipe_sock(void)
100 struct sockaddr_un sunaddr;
101 static pid_t our_pid;
105 if (our_pid != getpid()) {
110 if (winbindd_fd != -1) {
114 /* Check permissions on unix socket directory */
116 if (lstat(WINBINDD_SOCKET_DIR, &st) == -1) {
120 if (!S_ISDIR(st.st_mode) ||
121 (st.st_uid != 0 && st.st_uid != geteuid())) {
125 /* Connect to socket */
127 strncpy(path, WINBINDD_SOCKET_DIR, sizeof(path) - 1);
128 path[sizeof(path) - 1] = '\0';
130 strncat(path, "/", sizeof(path) - 1);
131 path[sizeof(path) - 1] = '\0';
133 strncat(path, WINBINDD_SOCKET_NAME, sizeof(path) - 1);
134 path[sizeof(path) - 1] = '\0';
136 ZERO_STRUCT(sunaddr);
137 sunaddr.sun_family = AF_UNIX;
138 strncpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path) - 1);
140 /* If socket file doesn't exist, don't bother trying to connect
141 with retry. This is an attempt to make the system usable when
142 the winbindd daemon is not running. */
144 if (lstat(path, &st) == -1) {
148 /* Check permissions on unix socket file */
150 if (!S_ISSOCK(st.st_mode) ||
151 (st.st_uid != 0 && st.st_uid != geteuid())) {
155 /* Connect to socket */
157 if ((winbindd_fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
161 if (connect(winbindd_fd, (struct sockaddr *)&sunaddr,
162 sizeof(sunaddr)) == -1) {
170 /* Write data to winbindd socket with timeout */
172 int write_sock(void *buffer, int count)
174 int result, nwritten;
176 /* Open connection to winbind daemon */
180 if (winbind_open_pipe_sock() == -1) {
184 /* Write data to socket */
188 while(nwritten < count) {
192 /* Catch pipe close on other end by checking if a read()
193 call would not block by calling select(). */
196 FD_SET(winbindd_fd, &r_fds);
199 if (select(winbindd_fd + 1, &r_fds, NULL, NULL, &tv) == -1) {
201 return -1; /* Select error */
204 /* Write should be OK if fd not available for reading */
206 if (!FD_ISSET(winbindd_fd, &r_fds)) {
210 result = write(winbindd_fd,
211 (char *)buffer + nwritten,
214 if ((result == -1) || (result == 0)) {
226 /* Pipe has closed on remote end */
236 /* Read data from winbindd socket with timeout */
238 static int read_sock(void *buffer, int count)
240 int result = 0, nread = 0;
242 /* Read data from socket */
244 while(nread < count) {
246 result = read(winbindd_fd, (char *)buffer + nread,
249 if ((result == -1) || (result == 0)) {
251 /* Read failed. I think the only useful thing we
252 can do here is just return -1 and fail since the
253 transaction has failed half way through. */
267 int read_reply(struct winbindd_response *response)
269 int result1, result2 = 0;
275 /* Read fixed length response */
277 if ((result1 = read_sock(response, sizeof(struct winbindd_response)))
283 /* We actually send the pointer value of the extra_data field from
284 the server. This has no meaning in the client's address space
285 so we clear it out. */
287 response->extra_data = NULL;
289 /* Read variable length response */
291 if (response->length > sizeof(struct winbindd_response)) {
292 int extra_data_len = response->length -
293 sizeof(struct winbindd_response);
295 /* Mallocate memory for extra data */
297 if (!(response->extra_data = malloc(extra_data_len))) {
301 if ((result2 = read_sock(response->extra_data, extra_data_len))
303 free_response(response);
308 /* Return total amount of data read */
310 return result1 + result2;
314 * send simple types of requests
317 NSS_STATUS winbindd_send_request(int req_type, struct winbindd_request *request)
319 struct winbindd_request lrequest;
321 /* Check for our tricky environment variable */
323 if (getenv(WINBINDD_DONT_ENV)) {
324 return NSS_STATUS_NOTFOUND;
327 /* smbd may have excluded this domain */
328 if (excluded_domain &&
329 strcasecmp(excluded_domain, request->domain) == 0) {
330 return NSS_STATUS_NOTFOUND;
334 ZERO_STRUCT(lrequest);
338 /* Fill in request and send down pipe */
340 init_request(request, req_type);
342 if (write_sock(request, sizeof(*request)) == -1) {
343 return NSS_STATUS_UNAVAIL;
346 return NSS_STATUS_SUCCESS;
350 * Get results from winbindd request
353 NSS_STATUS winbindd_get_response(struct winbindd_response *response)
355 struct winbindd_response lresponse;
358 ZERO_STRUCT(lresponse);
359 response = &lresponse;
362 init_response(response);
365 if (read_reply(response) == -1) {
366 return NSS_STATUS_UNAVAIL;
369 /* Throw away extra data if client didn't request it */
370 if (response == &lresponse) {
371 free_response(response);
374 /* Copy reply data from socket */
375 if (response->result != WINBINDD_OK) {
376 return NSS_STATUS_NOTFOUND;
379 return NSS_STATUS_SUCCESS;
382 /* Handle simple types of requests */
384 NSS_STATUS winbindd_request(int req_type,
385 struct winbindd_request *request,
386 struct winbindd_response *response)
390 status = winbindd_send_request(req_type, request);
391 if (status != NSS_STATUS_SUCCESS)
393 return winbindd_get_response(response);