1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24
25 #include <stdlib.h>
26 #include "files_common.h"
27 #include <time.h>
28 #include <exec_attr.h>
29 #include <strings.h>
30 #include <sys/stat.h>
31 #include <sys/mman.h>
32 #include <ctype.h>
33 #include <synch.h>
34 #include <sys/types.h>
35 #include <sys/uio.h>
36 #include <unistd.h>
37
38 /*
39 * files/getexecattr.c -- "files" backend for nsswitch "exec_attr" database
40 *
41 * _execattr_files_read_line and _execattr_files_XY_all code based on
42 * nss_files_read_line and nss_files_XY_all respectively, from files_common.c
43 */
44
45
46 /* externs from libnsl */
47 extern int _doexeclist(nss_XbyY_args_t *);
48 extern int _readbufline(char *, int, char *, int, int *);
49 extern char *_exec_wild_id(char *, const char *);
50 extern void _exec_cleanup(nss_status_t, nss_XbyY_args_t *);
51
52
53 /*
54 * check_match: returns 1 if matching entry found, else returns 0.
55 */
56 static int
check_match(nss_XbyY_args_t * argp,const char * line,int linelen)57 check_match(nss_XbyY_args_t *argp, const char *line, int linelen)
58 {
59 const char *limit, *linep, *keyp;
60 _priv_execattr *_priv_exec = (_priv_execattr *)(argp->key.attrp);
61 const char *exec_field[6];
62 int i;
63
64 exec_field[0] = _priv_exec->name; /* name */
65 exec_field[1] = _priv_exec->policy; /* policy */
66 exec_field[2] = _priv_exec->type; /* type */
67 exec_field[3] = NULL; /* res1 */
68 exec_field[4] = NULL; /* res2 */
69 exec_field[5] = _priv_exec->id; /* id */
70 /* No need to check attr field */
71
72 linep = line;
73 limit = line + linelen;
74
75 for (i = 0; i < 6; i++) {
76 keyp = exec_field[i];
77 if (keyp) {
78 /* compare field */
79 while (*keyp && linep < limit &&
80 *linep != ':' && *keyp == *linep) {
81 keyp++;
82 linep++;
83 }
84 if (*keyp || linep == limit || *linep != ':')
85 return (0);
86 } else {
87 /* skip field */
88 while (linep < limit && *linep != ':')
89 linep++;
90 }
91 linep++;
92 }
93 return (1);
94 }
95
96
97 static nss_status_t
_exec_files_XY_all(files_backend_ptr_t be,nss_XbyY_args_t * argp,int getby_flag)98 _exec_files_XY_all(files_backend_ptr_t be,
99 nss_XbyY_args_t *argp,
100 int getby_flag)
101 {
102 int parse_stat = 0;
103 int lastlen = 0;
104 int exec_fd = 0;
105 int f_size = 0;
106 time_t f_time = 0;
107 static time_t read_time = 0;
108 char *first;
109 char *last;
110 static char *f_buf = NULL;
111 struct stat f_stat;
112 nss_status_t res = NSS_NOTFOUND;
113 _priv_execattr *_priv_exec = (_priv_execattr *)(argp->key.attrp);
114 static rwlock_t exec_lock;
115
116 if (((be->buf == NULL) &&
117 ((be->buf = (char *)calloc(1, be->minbuf)) == NULL)) ||
118 (be->filename == NULL) ||
119 (rw_rdlock(&exec_lock) != 0)) {
120 return (NSS_UNAVAIL);
121 }
122
123 /*
124 * check the size and the time stamp on the file
125 */
126 if (stat(be->filename, &f_stat) != 0) {
127 (void) _nss_files_endent(be, 0);
128 (void) rw_unlock(&exec_lock);
129 return (NSS_UNAVAIL);
130 }
131
132 f_size = f_stat.st_size;
133 f_time = f_stat.st_mtime;
134
135 while (f_time > read_time || f_buf == NULL) {
136 /*
137 * file has been modified since we last read it
138 * or we never read it or memory allocation
139 * failed before.
140 * read it into the buffer with rw lock.
141 */
142 (void) rw_unlock(&exec_lock);
143 if (rw_wrlock(&exec_lock) != 0) {
144 (void) _nss_files_endent(be, 0);
145 return (NSS_UNAVAIL);
146 }
147 if ((be->f = fopen(be->filename, "rF")) == 0) {
148 (void) _nss_files_endent(be, 0);
149 (void) rw_unlock(&exec_lock);
150 return (NSS_UNAVAIL);
151 }
152 exec_fd = fileno(be->f);
153 if (f_buf != NULL)
154 free(f_buf);
155 if ((f_buf = malloc(f_size)) == NULL) {
156 (void) _nss_files_endent(be, 0);
157 (void) rw_unlock(&exec_lock);
158 return (NSS_UNAVAIL);
159 }
160 if (read(exec_fd, f_buf, f_size) < f_size) {
161 free(f_buf);
162 (void) _nss_files_endent(be, 0);
163 (void) rw_unlock(&exec_lock);
164 return (NSS_UNAVAIL);
165 }
166 read_time = f_time;
167 (void) rw_unlock(&exec_lock);
168 /*
169 * verify that the file did not change after
170 * we read it.
171 */
172 if (rw_rdlock(&exec_lock) != 0) {
173 free(f_buf);
174 (void) _nss_files_endent(be, 0);
175 return (NSS_UNAVAIL);
176 }
177 if (stat(be->filename, &f_stat) != 0) {
178 free(f_buf);
179 (void) _nss_files_endent(be, 0);
180 (void) rw_unlock(&exec_lock);
181 return (NSS_UNAVAIL);
182 }
183 f_size = f_stat.st_size;
184 f_time = f_stat.st_mtime;
185 }
186
187 res = NSS_NOTFOUND;
188 /*CONSTCOND*/
189 while (1) {
190 int linelen = 0;
191 char *instr = be->buf;
192
193 linelen = _readbufline(f_buf, f_size, instr, be->minbuf,
194 &lastlen);
195 if (linelen < 0) {
196 /* End of file */
197 break;
198 }
199
200 /*
201 * If the entry doesn't contain the filter string then
202 * it can't be the entry we want, so don't bother looking
203 * more closely at it.
204 */
205 switch (getby_flag) {
206 case NSS_DBOP_EXECATTR_BYNAME:
207 if (strstr(instr, _priv_exec->name) == NULL)
208 continue;
209 break;
210 case NSS_DBOP_EXECATTR_BYID:
211 if (strstr(instr, _priv_exec->id) == NULL)
212 continue;
213 break;
214 case NSS_DBOP_EXECATTR_BYNAMEID:
215 if ((strstr(instr, _priv_exec->name) == NULL) ||
216 (strstr(instr, _priv_exec->id) == NULL))
217 continue;
218 break;
219 default:
220 break;
221 }
222 if (((_priv_exec->policy != NULL) &&
223 (strstr(instr, _priv_exec->policy) == NULL)) ||
224 ((_priv_exec->type != NULL) &&
225 (strstr(instr, _priv_exec->type) == NULL)))
226 continue;
227
228 /*
229 * Get rid of white spaces, comments etc.
230 */
231 if ((last = strchr(instr, '#')) == NULL)
232 last = instr + linelen;
233 *last-- = '\0'; /* Nuke '\n' or #comment */
234 /*
235 * Skip leading whitespace. Normally there isn't any,
236 * so it's not worth calling strspn().
237 */
238 for (first = instr; isspace(*first); first++)
239 ;
240 if (*first == '\0')
241 continue;
242 /*
243 * Found something non-blank on the line. Skip back
244 * over any trailing whitespace; since we know there's
245 * non-whitespace earlier in the line, checking for
246 * termination is easy.
247 */
248 while (isspace(*last))
249 --last;
250 linelen = last - first + 1;
251 if (first != instr)
252 instr = first;
253
254 /* Check the entry */
255 argp->returnval = NULL;
256 argp->returnlen = 0;
257 if (check_match(argp, instr, linelen) == 0)
258 continue;
259
260 /* Marshall the data */
261 parse_stat = (*argp->str2ent)(instr, linelen, argp->buf.result,
262 argp->buf.buffer, argp->buf.buflen);
263 if (parse_stat == NSS_STR_PARSE_SUCCESS) {
264 argp->returnval = (argp->buf.result != NULL)?
265 argp->buf.result : argp->buf.buffer;
266 argp->returnlen = linelen;
267 res = NSS_SUCCESS;
268 if (IS_GET_ONE(_priv_exec->search_flag)) {
269 break;
270 } else if (_doexeclist(argp) == 0) {
271 res = NSS_UNAVAIL;
272 break;
273 }
274 } else if (parse_stat == NSS_STR_PARSE_ERANGE) {
275 argp->erange = 1;
276 break;
277 } /* else if (parse_stat == NSS_STR_PARSE_PARSE) don't care ! */
278 }
279
280 (void) _nss_files_endent(be, 0);
281 (void) rw_unlock(&exec_lock);
282
283 return (res);
284 }
285
286
287 /*
288 * If search for exact match for id failed, get_wild checks if we have
289 * a wild-card entry for that id.
290 */
291 static nss_status_t
get_wild(files_backend_ptr_t be,nss_XbyY_args_t * argp,int getby_flag)292 get_wild(files_backend_ptr_t be, nss_XbyY_args_t *argp, int getby_flag)
293 {
294 const char *orig_id = NULL;
295 char *old_id = NULL;
296 char *wild_id = NULL;
297 nss_status_t res = NSS_NOTFOUND;
298 _priv_execattr *_priv_exec = (_priv_execattr *)(argp->key.attrp);
299
300 orig_id = _priv_exec->id;
301 old_id = strdup(_priv_exec->id);
302 wild_id = old_id;
303 while ((wild_id = _exec_wild_id(wild_id, _priv_exec->type)) != NULL) {
304 _priv_exec->id = wild_id;
305 res = _exec_files_XY_all(be, argp, getby_flag);
306 if (res == NSS_SUCCESS)
307 break;
308 }
309 _priv_exec->id = orig_id;
310 if (old_id)
311 free(old_id);
312
313 return (res);
314 }
315
316
317 static nss_status_t
getbynam(files_backend_ptr_t be,void * a)318 getbynam(files_backend_ptr_t be, void *a)
319 {
320 nss_status_t res;
321 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
322
323 res = _exec_files_XY_all(be, argp, NSS_DBOP_EXECATTR_BYNAME);
324
325 _exec_cleanup(res, argp);
326
327 return (res);
328 }
329
330
331 static nss_status_t
getbyid(files_backend_ptr_t be,void * a)332 getbyid(files_backend_ptr_t be, void *a)
333 {
334 nss_status_t res;
335 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
336 /*LINTED*/
337 _priv_execattr *_priv_exec = (_priv_execattr *)(argp->key.attrp);
338
339 res = _exec_files_XY_all(be, argp, NSS_DBOP_EXECATTR_BYID);
340
341 if (res != NSS_SUCCESS)
342 res = get_wild(be, argp, NSS_DBOP_EXECATTR_BYID);
343
344 _exec_cleanup(res, argp);
345
346 return (res);
347 }
348
349
350 static nss_status_t
getbynameid(files_backend_ptr_t be,void * a)351 getbynameid(files_backend_ptr_t be, void *a)
352 {
353 nss_status_t res;
354 nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
355 /*LINTED*/
356 _priv_execattr *_priv_exec = (_priv_execattr *)(argp->key.attrp);
357
358 res = _exec_files_XY_all(be, argp, NSS_DBOP_EXECATTR_BYNAMEID);
359
360 if (res != NSS_SUCCESS)
361 res = get_wild(be, argp, NSS_DBOP_EXECATTR_BYNAMEID);
362
363 _exec_cleanup(res, argp);
364
365 return (res);
366 }
367
368
369 static files_backend_op_t execattr_ops[] = {
370 _nss_files_destr,
371 _nss_files_endent,
372 _nss_files_setent,
373 _nss_files_getent_netdb,
374 getbynam,
375 getbyid,
376 getbynameid
377 };
378
379 /*ARGSUSED*/
380 nss_backend_t *
_nss_files_exec_attr_constr(const char * dummy1,const char * dummy2,const char * dummy3,const char * dummy4,const char * dummy5,const char * dummy6,const char * dummy7)381 _nss_files_exec_attr_constr(const char *dummy1,
382 const char *dummy2,
383 const char *dummy3,
384 const char *dummy4,
385 const char *dummy5,
386 const char *dummy6,
387 const char *dummy7)
388 {
389 return (_nss_files_constr(execattr_ops,
390 sizeof (execattr_ops)/sizeof (execattr_ops[0]),
391 EXECATTR_FILENAME, NSS_LINELEN_EXECATTR, NULL));
392 }
393