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