d9898ee8 |
1 | /* |
2 | ** Copyright 1998 - 2007 Double Precision, Inc. |
3 | ** See COPYING for distribution information. |
4 | */ |
5 | |
6 | #if HAVE_CONFIG_H |
7 | #include "config.h" |
8 | #endif |
9 | #include "dbobj.h" |
10 | #include "userdb.h" |
11 | #include <string.h> |
12 | #include <stdlib.h> |
13 | #include <stdio.h> |
14 | #include <errno.h> |
15 | #include <time.h> |
16 | #include <sys/types.h> |
17 | #if HAVE_SYS_STAT_H |
18 | #include <sys/stat.h> |
19 | #endif |
20 | |
21 | static const char rcsid[]="$Id: userdb.c,v 1.10 2007/04/14 03:02:46 mrsam Exp $"; |
22 | |
23 | static struct dbobj d; |
24 | static time_t dt; |
25 | static ino_t di; |
26 | |
27 | static int initialized=0; |
28 | int userdb_debug_level=0; |
29 | |
30 | /* Open userdb.dat, if already opened, see if it changed, if so reopen */ |
31 | |
32 | void userdb_init(const char *n) |
33 | { |
34 | struct stat stat_buf; |
35 | |
36 | if (initialized) |
37 | { |
38 | if (stat(n, &stat_buf) || |
39 | stat_buf.st_mtime != dt || |
40 | stat_buf.st_ino != di) |
41 | { |
42 | dbobj_close(&d); |
43 | initialized=0; |
44 | dt=stat_buf.st_mtime; |
45 | di=stat_buf.st_ino; |
46 | } |
47 | } |
48 | else if (stat(n, &stat_buf)) |
49 | { |
50 | if (userdb_debug_level) |
51 | fprintf(stderr, |
52 | "DEBUG: userdb: unable to stat %s: %s\n", |
53 | n, strerror(errno)); |
54 | return; |
55 | } |
56 | else |
57 | { |
58 | dt=stat_buf.st_mtime; |
59 | di=stat_buf.st_ino; |
60 | } |
61 | |
62 | if (!initialized) |
63 | { |
64 | if (dbobj_open(&d, n, "R")) |
65 | { |
66 | if (userdb_debug_level) |
67 | fprintf(stderr, |
68 | "DEBUG: userdb: failed to open %s\n", |
69 | n); |
70 | return; |
71 | } |
72 | if (userdb_debug_level) |
73 | fprintf(stderr, "DEBUG: userdb: opened %s\n", n); |
74 | initialized=1; |
75 | } |
76 | } |
77 | |
78 | void userdb_close() |
79 | { |
80 | if (initialized) |
81 | { |
82 | dbobj_close(&d); |
83 | initialized=0; |
84 | } |
85 | userdb_debug_level=0; |
86 | } |
87 | |
88 | void userdb_set_debug(int lvl) |
89 | { |
90 | userdb_debug_level = lvl; |
91 | } |
92 | |
93 | /* Fetch a record from userdb.dat */ |
94 | |
95 | char *userdb(const char *u) |
96 | { |
97 | char *p,*q; |
98 | size_t l; |
99 | |
100 | if (!initialized) |
101 | { |
102 | errno=ENOENT; |
103 | return (0); |
104 | } |
105 | |
106 | q=dbobj_fetch(&d, u, strlen(u), &l, ""); |
107 | if (!q) |
108 | { |
109 | if (userdb_debug_level) |
110 | fprintf(stderr, "DEBUG: userdb: entry not found\n"); |
111 | errno=ENOENT; |
112 | return(0); |
113 | } |
114 | |
115 | p=malloc(l+1); |
116 | if (!p) |
117 | { |
118 | free(q); |
119 | return (0); |
120 | } |
121 | |
122 | if (l) memcpy(p, q, l); |
123 | free(q); |
124 | p[l]=0; |
125 | return (p); |
126 | } |
127 | |
128 | /* Return a pointer to a specific field in this record */ |
129 | |
130 | const char *userdb_get(const char *u, const char *n, int *l) |
131 | { |
132 | int nl=strlen(n); |
133 | |
134 | while (u && *u) |
135 | { |
136 | if (memcmp(u, n, nl) == 0 && |
137 | (u[nl] == 0 || u[nl] == '=' || u[nl] == '|')) |
138 | { |
139 | u += nl; |
140 | *l=0; |
141 | if (*u == '=') |
142 | { |
143 | ++u; |
144 | while ( u[*l] && u[*l] != '|') |
145 | ++ *l; |
146 | } |
147 | return (u); |
148 | } |
149 | u=strchr(u, '|'); |
150 | if (u) ++u; |
151 | } |
152 | return (0); |
153 | } |
154 | |
155 | /* Extract field as an unsigned int */ |
156 | |
157 | unsigned userdb_getu(const char *u, const char *n, unsigned defnum) |
158 | { |
159 | int l; |
160 | const char *p; |
161 | |
162 | if ((p=userdb_get(u, n, &l)) != 0) |
163 | { |
164 | defnum=0; |
165 | while (l && *p >= '0' && *p <= '9') |
166 | { |
167 | defnum = defnum * 10 + (*p++ - '0'); |
168 | --l; |
169 | } |
170 | } |
171 | return (defnum); |
172 | } |
173 | |
174 | /* Extract a field into a dynamically allocated buffer */ |
175 | |
176 | char *userdb_gets(const char *u, const char *n) |
177 | { |
178 | int l; |
179 | const char *p; |
180 | char *q; |
181 | |
182 | if ((p=userdb_get(u, n, &l)) != 0) |
183 | { |
184 | q=malloc(l+1); |
185 | if (!q) |
186 | return (0); |
187 | |
188 | if (l) memcpy(q, p, l); |
189 | q[l]=0; |
190 | return (q); |
191 | } |
192 | errno=ENOENT; |
193 | return (0); |
194 | } |
195 | |
196 | /* Create a userdbs structure based upon a uid (reverse lookup) */ |
197 | |
198 | struct userdbs *userdb_createsuid(uid_t u) |
199 | { |
200 | char buf[80]; |
201 | char *p=buf+sizeof(buf)-1, *q; |
202 | struct userdbs *s; |
203 | |
204 | /* Lookup uid= record */ |
205 | |
206 | *p=0; |
207 | *--p='='; |
208 | do |
209 | { |
210 | *--p= "0123456789"[u % 10]; |
211 | u=u/10; |
212 | } while (u); |
213 | p=userdb(p); |
214 | if (!p) return (0); |
215 | |
216 | /* Have account name, now look it up. */ |
217 | |
218 | q=userdb(p); |
219 | if (!q) |
220 | { |
221 | free(p); |
222 | return (0); |
223 | } |
224 | s=userdb_creates(q); |
225 | if (s) |
226 | s->udb_name=p; |
227 | else |
228 | free(p); |
229 | free(q); |
230 | return (s); |
231 | } |
232 | |
233 | static struct userdbs *userdb_enum(char *key, size_t keylen, |
234 | char *val, size_t vallen) |
235 | { |
236 | if (key) |
237 | { |
238 | char *valz=malloc(vallen+1); |
239 | |
240 | if (valz) |
241 | { |
242 | struct userdbs *udbs; |
243 | |
244 | memcpy(valz, val, vallen); |
245 | valz[vallen]=0; |
246 | |
247 | udbs=userdb_creates(valz); |
248 | |
249 | if (udbs) |
250 | { |
251 | if ((udbs->udb_name=malloc(keylen+1)) != NULL) |
252 | { |
253 | memcpy(udbs->udb_name, key, keylen); |
254 | udbs->udb_name[keylen]=0; |
255 | free(valz); |
256 | return udbs; |
257 | } |
258 | userdb_frees(udbs); |
259 | } |
260 | free(valz); |
261 | } |
262 | } |
263 | return NULL; |
264 | } |
265 | |
266 | |
267 | struct userdbs *userdb_enum_first() |
268 | { |
269 | char *val; |
270 | size_t vallen; |
271 | size_t keylen; |
272 | char *key=dbobj_firstkey(&d, &keylen, &val, &vallen); |
273 | |
274 | if (key) |
275 | { |
276 | struct userdbs *udbs=userdb_enum(key, keylen, val, vallen); |
277 | |
278 | free(val); |
279 | |
280 | if (udbs) |
281 | return udbs; |
282 | |
283 | /* Could be a reverse UID entry */ |
284 | |
285 | return userdb_enum_next(); |
286 | } |
287 | return NULL; |
288 | } |
289 | |
290 | struct userdbs *userdb_enum_next() |
291 | { |
292 | char *val; |
293 | size_t vallen; |
294 | size_t keylen; |
295 | char *key; |
296 | |
297 | while ((key=dbobj_nextkey(&d, &keylen, &val, &vallen)) != NULL) |
298 | { |
299 | struct userdbs *udbs=userdb_enum(key, keylen, val, vallen); |
300 | |
301 | free(val); |
302 | |
303 | if (udbs) |
304 | return udbs; |
305 | } |
306 | return NULL; |
307 | } |
308 | |
309 | /* Extracted a userdb.dat record, convert it to a userdbs structure */ |
310 | |
311 | struct userdbs *userdb_creates(const char *u) |
312 | { |
313 | struct userdbs *udbs=(struct userdbs *)malloc(sizeof(struct userdbs)); |
314 | char *s; |
315 | |
316 | if (!udbs) return (0); |
317 | memset((char *)udbs, 0, sizeof(*udbs)); |
318 | |
319 | if ((udbs->udb_dir=userdb_gets(u, "home")) == 0) |
320 | { |
321 | if (userdb_debug_level) |
322 | fprintf(stderr, |
323 | "DEBUG: userdb: required value 'home' is missing\n"); |
324 | userdb_frees(udbs); |
325 | return (0); |
326 | } |
327 | |
328 | if ((s=userdb_gets(u, "uid")) != 0) |
329 | { |
330 | udbs->udb_uid=atol(s); |
331 | free(s); |
332 | if ((s=userdb_gets(u, "gid")) != 0) |
333 | { |
334 | udbs->udb_gid=atol(s); |
335 | free(s); |
336 | |
337 | if ((s=userdb_gets(u, "shell")) != 0) |
338 | udbs->udb_shell=s; |
339 | else if (errno != ENOENT) |
340 | { |
341 | userdb_frees(udbs); |
342 | return (0); |
343 | } |
344 | |
345 | if ((s=userdb_gets(u, "mail")) != 0) |
346 | udbs->udb_mailbox=s; |
347 | else if (errno != ENOENT) |
348 | { |
349 | userdb_frees(udbs); |
350 | return (0); |
351 | } |
352 | if ((s=userdb_gets(u, "quota")) != 0) |
353 | udbs->udb_quota=s; |
354 | else if (errno != ENOENT) |
355 | { |
356 | userdb_frees(udbs); |
357 | return (0); |
358 | } |
359 | if ((s=userdb_gets(u, "gecos")) != 0) |
360 | udbs->udb_gecos=s; |
361 | else if (errno != ENOENT) |
362 | { |
363 | userdb_frees(udbs); |
364 | return (0); |
365 | } |
366 | if ((s=userdb_gets(u, "options")) != 0) |
367 | udbs->udb_options=s; |
368 | else if (errno != ENOENT) |
369 | { |
370 | userdb_frees(udbs); |
371 | return (0); |
372 | } |
373 | udbs->udb_source=userdb_gets(u, "_"); |
374 | if (userdb_debug_level) |
375 | fprintf(stderr, |
376 | "DEBUG: userdb: home=%s, uid=%ld, gid=%ld, shell=%s, " |
377 | "mail=%s, quota=%s, gecos=%s, options=%s\n", |
378 | udbs->udb_dir ? udbs->udb_dir : "<unset>", |
379 | (long)udbs->udb_uid, (long)udbs->udb_gid, |
380 | udbs->udb_shell ? udbs->udb_shell : "<unset>", |
381 | udbs->udb_mailbox ? udbs->udb_mailbox : "<unset>", |
382 | udbs->udb_quota ? udbs->udb_quota : "<unset>", |
383 | udbs->udb_gecos ? udbs->udb_gecos : "<unset>", |
384 | udbs->udb_options ? udbs->udb_options : "<unset>"); |
385 | return (udbs); |
386 | } |
387 | else |
388 | if (userdb_debug_level) |
389 | fprintf(stderr, |
390 | "DEBUG: userdb: required value 'gid' is missing\n"); |
391 | } |
392 | else |
393 | if (userdb_debug_level) |
394 | fprintf(stderr, |
395 | "DEBUG: userdb: required value 'uid' is missing\n"); |
396 | userdb_frees(udbs); |
397 | return (0); |
398 | } |
399 | |
400 | void userdb_frees(struct userdbs *u) |
401 | { |
402 | if (u->udb_options) free(u->udb_options); |
403 | if (u->udb_name) free(u->udb_name); |
404 | if (u->udb_gecos) free(u->udb_gecos); |
405 | if (u->udb_dir) free(u->udb_dir); |
406 | if (u->udb_shell) free(u->udb_shell); |
407 | if (u->udb_mailbox) free(u->udb_mailbox); |
408 | if (u->udb_quota) free(u->udb_quota); |
409 | if (u->udb_source) free(u->udb_source); |
410 | free(u); |
411 | } |
412 | |