1 | /* |
---|
2 | * POSIX 1003.1b - 9.2.2 - User Database Access Routines |
---|
3 | * |
---|
4 | * The license and distribution terms for this file may be |
---|
5 | * found in the file LICENSE in this distribution or at |
---|
6 | * http://www.rtems.com/license/LICENSE. |
---|
7 | * |
---|
8 | * $Id$ |
---|
9 | */ |
---|
10 | |
---|
11 | #if HAVE_CONFIG_H |
---|
12 | #include "config.h" |
---|
13 | #endif |
---|
14 | |
---|
15 | #include <stdio.h> |
---|
16 | #include <sys/types.h> |
---|
17 | #include <pwd.h> |
---|
18 | #include <grp.h> |
---|
19 | #include <errno.h> |
---|
20 | #include <unistd.h> |
---|
21 | #include <stdlib.h> |
---|
22 | #include <string.h> |
---|
23 | #include <limits.h> |
---|
24 | #include <ctype.h> |
---|
25 | |
---|
26 | #include <rtems/libio_.h> |
---|
27 | |
---|
28 | /* |
---|
29 | * Static, thread-unsafe, buffers |
---|
30 | */ |
---|
31 | static FILE *passwd_fp; |
---|
32 | static char pwbuf[200]; |
---|
33 | static struct passwd pwent; |
---|
34 | static FILE *group_fp; |
---|
35 | static char grbuf[200]; |
---|
36 | static struct group grent; |
---|
37 | |
---|
38 | /* |
---|
39 | * Initialize useable but dummy databases |
---|
40 | */ |
---|
41 | void init_etc_passwd_group(void) |
---|
42 | { |
---|
43 | FILE *fp; |
---|
44 | static char etc_passwd_initted = 0; |
---|
45 | |
---|
46 | if (etc_passwd_initted) |
---|
47 | return; |
---|
48 | etc_passwd_initted = 1; |
---|
49 | mkdir("/etc", 0777); |
---|
50 | |
---|
51 | /* |
---|
52 | * Initialize /etc/passwd |
---|
53 | */ |
---|
54 | if ((fp = fopen("/etc/passwd", "r")) != NULL) { |
---|
55 | fclose(fp); |
---|
56 | } |
---|
57 | else if ((fp = fopen("/etc/passwd", "w")) != NULL) { |
---|
58 | fprintf(fp, "root:*:0:0:root::/:/bin/sh\n" |
---|
59 | "rtems:*:1:1:RTEMS Application::/:/bin/sh\n" |
---|
60 | "tty:!:2:2:tty owner::/:/bin/false\n" ); |
---|
61 | fclose(fp); |
---|
62 | } |
---|
63 | |
---|
64 | /* |
---|
65 | * Initialize /etc/group |
---|
66 | */ |
---|
67 | if ((fp = fopen("/etc/group", "r")) != NULL) { |
---|
68 | fclose(fp); |
---|
69 | } |
---|
70 | else if ((fp = fopen("/etc/group", "w")) != NULL) { |
---|
71 | fprintf( fp, "root:x:0:root\n" |
---|
72 | "rtems:x:1:rtems\n" |
---|
73 | "tty:x:2:tty\n" ); |
---|
74 | fclose(fp); |
---|
75 | } |
---|
76 | } |
---|
77 | |
---|
78 | /* |
---|
79 | * Extract a string value from the database |
---|
80 | */ |
---|
81 | static int |
---|
82 | scanString(FILE *fp, char **name, char **bufp, size_t *nleft, int nlFlag) |
---|
83 | { |
---|
84 | int c; |
---|
85 | |
---|
86 | *name = *bufp; |
---|
87 | for (;;) { |
---|
88 | c = getc(fp); |
---|
89 | if (c == ':') { |
---|
90 | if (nlFlag) |
---|
91 | return 0; |
---|
92 | break; |
---|
93 | } |
---|
94 | if (c == '\n') { |
---|
95 | if (!nlFlag) |
---|
96 | return 0; |
---|
97 | break; |
---|
98 | } |
---|
99 | if (c == EOF) |
---|
100 | return 0; |
---|
101 | if (*nleft < 2) |
---|
102 | return 0; |
---|
103 | **bufp = c; |
---|
104 | ++(*bufp); |
---|
105 | --(*nleft); |
---|
106 | } |
---|
107 | **bufp = '\0'; |
---|
108 | ++(*bufp); |
---|
109 | --(*nleft); |
---|
110 | return 1; |
---|
111 | } |
---|
112 | |
---|
113 | /* |
---|
114 | * Extract an integer value from the database |
---|
115 | */ |
---|
116 | static int |
---|
117 | scanInt(FILE *fp, int *val) |
---|
118 | { |
---|
119 | int c; |
---|
120 | unsigned int i = 0; |
---|
121 | unsigned int limit = INT_MAX; |
---|
122 | int sign = 0; |
---|
123 | int d; |
---|
124 | |
---|
125 | for (;;) { |
---|
126 | c = getc(fp); |
---|
127 | if (c == ':') |
---|
128 | break; |
---|
129 | if (sign == 0) { |
---|
130 | if (c == '-') { |
---|
131 | sign = -1; |
---|
132 | limit++; |
---|
133 | continue; |
---|
134 | } |
---|
135 | sign = 1; |
---|
136 | } |
---|
137 | if (!isdigit(c)) |
---|
138 | return 0; |
---|
139 | d = c - '0'; |
---|
140 | if ((i > (limit / 10)) |
---|
141 | || ((i == (limit / 10)) && (d > (limit % 10)))) |
---|
142 | return 0; |
---|
143 | i = i * 10 + d; |
---|
144 | } |
---|
145 | if (sign == 0) |
---|
146 | return 0; |
---|
147 | *val = i * sign; |
---|
148 | return 1; |
---|
149 | } |
---|
150 | |
---|
151 | /* |
---|
152 | * Extract a single password record from the database |
---|
153 | */ |
---|
154 | static int scanpw( |
---|
155 | FILE *fp, |
---|
156 | struct passwd *pwd, |
---|
157 | char *buffer, |
---|
158 | size_t bufsize |
---|
159 | ) |
---|
160 | { |
---|
161 | int pwuid, pwgid; |
---|
162 | |
---|
163 | if (!scanString(fp, &pwd->pw_name, &buffer, &bufsize, 0) |
---|
164 | || !scanString(fp, &pwd->pw_passwd, &buffer, &bufsize, 0) |
---|
165 | || !scanInt(fp, &pwuid) |
---|
166 | || !scanInt(fp, &pwgid) |
---|
167 | || !scanString(fp, &pwd->pw_comment, &buffer, &bufsize, 0) |
---|
168 | || !scanString(fp, &pwd->pw_gecos, &buffer, &bufsize, 0) |
---|
169 | || !scanString(fp, &pwd->pw_dir, &buffer, &bufsize, 0) |
---|
170 | || !scanString(fp, &pwd->pw_shell, &buffer, &bufsize, 1)) |
---|
171 | return 0; |
---|
172 | pwd->pw_uid = pwuid; |
---|
173 | pwd->pw_gid = pwgid; |
---|
174 | return 1; |
---|
175 | } |
---|
176 | |
---|
177 | static int getpw_r( |
---|
178 | const char *name, |
---|
179 | int uid, |
---|
180 | struct passwd *pwd, |
---|
181 | char *buffer, |
---|
182 | size_t bufsize, |
---|
183 | struct passwd **result |
---|
184 | ) |
---|
185 | { |
---|
186 | FILE *fp; |
---|
187 | int match; |
---|
188 | |
---|
189 | init_etc_passwd_group(); |
---|
190 | |
---|
191 | if ((fp = fopen("/etc/passwd", "r")) == NULL) { |
---|
192 | errno = EINVAL; |
---|
193 | return -1; |
---|
194 | } |
---|
195 | for(;;) { |
---|
196 | if (!scanpw(fp, pwd, buffer, bufsize)) { |
---|
197 | errno = EINVAL; |
---|
198 | fclose(fp); |
---|
199 | return -1; |
---|
200 | } |
---|
201 | if (name) { |
---|
202 | match = (strcmp(pwd->pw_name, name) == 0); |
---|
203 | } |
---|
204 | else { |
---|
205 | match = (pwd->pw_uid == uid); |
---|
206 | } |
---|
207 | if (match) { |
---|
208 | fclose(fp); |
---|
209 | *result = pwd; |
---|
210 | return 0; |
---|
211 | } |
---|
212 | } |
---|
213 | fclose(fp); |
---|
214 | errno = EINVAL; |
---|
215 | return -1; |
---|
216 | } |
---|
217 | |
---|
218 | int getpwnam_r( |
---|
219 | const char *name, |
---|
220 | struct passwd *pwd, |
---|
221 | char *buffer, |
---|
222 | size_t bufsize, |
---|
223 | struct passwd **result |
---|
224 | ) |
---|
225 | { |
---|
226 | return getpw_r(name, 0, pwd, buffer, bufsize, result); |
---|
227 | } |
---|
228 | |
---|
229 | struct passwd *getpwnam( |
---|
230 | const char *name |
---|
231 | ) |
---|
232 | { |
---|
233 | struct passwd *p; |
---|
234 | |
---|
235 | if(getpwnam_r(name, &pwent, pwbuf, sizeof pwbuf, &p)) |
---|
236 | return NULL; |
---|
237 | return p; |
---|
238 | } |
---|
239 | |
---|
240 | int getpwuid_r( |
---|
241 | uid_t uid, |
---|
242 | struct passwd *pwd, |
---|
243 | char *buffer, |
---|
244 | size_t bufsize, |
---|
245 | struct passwd **result |
---|
246 | ) |
---|
247 | { |
---|
248 | return getpw_r(NULL, uid, pwd, buffer, bufsize, result); |
---|
249 | } |
---|
250 | |
---|
251 | struct passwd *getpwuid( |
---|
252 | uid_t uid |
---|
253 | ) |
---|
254 | { |
---|
255 | struct passwd *p; |
---|
256 | |
---|
257 | if(getpwuid_r(uid, &pwent, pwbuf, sizeof pwbuf, &p)) |
---|
258 | return NULL; |
---|
259 | return p; |
---|
260 | } |
---|
261 | |
---|
262 | struct passwd *getpwent() |
---|
263 | { |
---|
264 | if (passwd_fp == NULL) |
---|
265 | return NULL; |
---|
266 | if (!scanpw(passwd_fp, &pwent, pwbuf, sizeof pwbuf)) |
---|
267 | return NULL; |
---|
268 | return &pwent; |
---|
269 | } |
---|
270 | |
---|
271 | void setpwent(void) |
---|
272 | { |
---|
273 | init_etc_passwd_group(); |
---|
274 | |
---|
275 | if (passwd_fp != NULL) |
---|
276 | fclose(passwd_fp); |
---|
277 | passwd_fp = fopen("/etc/passwd", "r"); |
---|
278 | } |
---|
279 | |
---|
280 | void endpwent(void) |
---|
281 | { |
---|
282 | if (passwd_fp != NULL) |
---|
283 | fclose(passwd_fp); |
---|
284 | } |
---|
285 | |
---|
286 | /* |
---|
287 | * Extract a single group record from the database |
---|
288 | */ |
---|
289 | static int scangr( |
---|
290 | FILE *fp, |
---|
291 | struct group *grp, |
---|
292 | char *buffer, |
---|
293 | size_t bufsize |
---|
294 | ) |
---|
295 | { |
---|
296 | int grgid; |
---|
297 | char *grmem, *cp; |
---|
298 | int memcount; |
---|
299 | |
---|
300 | if (!scanString(fp, &grp->gr_name, &buffer, &bufsize, 0) |
---|
301 | || !scanString(fp, &grp->gr_passwd, &buffer, &bufsize, 0) |
---|
302 | || !scanInt(fp, &grgid) |
---|
303 | || !scanString(fp, &grmem, &buffer, &bufsize, 1)) |
---|
304 | return 0; |
---|
305 | grp->gr_gid = grgid; |
---|
306 | |
---|
307 | /* |
---|
308 | * Determine number of members |
---|
309 | */ |
---|
310 | for (cp = grmem, memcount = 1 ; *cp != 0 ; cp++) { |
---|
311 | if(*cp == ',') |
---|
312 | memcount++; |
---|
313 | } |
---|
314 | |
---|
315 | /* |
---|
316 | * Hack to produce (hopefully) a suitably-aligned array of pointers |
---|
317 | */ |
---|
318 | if (bufsize < (((memcount+1)*sizeof(char *)) + 15)) |
---|
319 | return 0; |
---|
320 | grp->gr_mem = (char **)(((unsigned long)buffer + 15) & ~15); |
---|
321 | |
---|
322 | /* |
---|
323 | * Fill in pointer array |
---|
324 | */ |
---|
325 | grp->gr_mem[0] = grmem; |
---|
326 | for (cp = grmem, memcount = 1 ; *cp != 0 ; cp++) { |
---|
327 | if(*cp == ',') { |
---|
328 | *cp = '\0'; |
---|
329 | grp->gr_mem[memcount++] = cp + 1; |
---|
330 | } |
---|
331 | } |
---|
332 | grp->gr_mem[memcount] = NULL; |
---|
333 | return 1; |
---|
334 | } |
---|
335 | |
---|
336 | static int getgr_r( |
---|
337 | const char *name, |
---|
338 | int gid, |
---|
339 | struct group *grp, |
---|
340 | char *buffer, |
---|
341 | size_t bufsize, |
---|
342 | struct group **result |
---|
343 | ) |
---|
344 | { |
---|
345 | FILE *fp; |
---|
346 | int match; |
---|
347 | |
---|
348 | init_etc_passwd_group(); |
---|
349 | |
---|
350 | if ((fp = fopen("/etc/group", "r")) == NULL) { |
---|
351 | errno = EINVAL; |
---|
352 | return -1; |
---|
353 | } |
---|
354 | for(;;) { |
---|
355 | if (!scangr(fp, grp, buffer, bufsize)) { |
---|
356 | errno = EINVAL; |
---|
357 | fclose(fp); |
---|
358 | return -1; |
---|
359 | } |
---|
360 | if (name) { |
---|
361 | match = (strcmp(grp->gr_name, name) == 0); |
---|
362 | } |
---|
363 | else { |
---|
364 | match = (grp->gr_gid == gid); |
---|
365 | } |
---|
366 | if (match) { |
---|
367 | fclose(fp); |
---|
368 | *result = grp; |
---|
369 | return 0; |
---|
370 | } |
---|
371 | } |
---|
372 | fclose(fp); |
---|
373 | errno = EINVAL; |
---|
374 | return -1; |
---|
375 | } |
---|
376 | |
---|
377 | int getgrnam_r( |
---|
378 | const char *name, |
---|
379 | struct group *grp, |
---|
380 | char *buffer, |
---|
381 | size_t bufsize, |
---|
382 | struct group **result |
---|
383 | ) |
---|
384 | { |
---|
385 | return getgr_r(name, 0, grp, buffer, bufsize, result); |
---|
386 | } |
---|
387 | |
---|
388 | struct group *getgrnam( |
---|
389 | const char *name |
---|
390 | ) |
---|
391 | { |
---|
392 | struct group *p; |
---|
393 | |
---|
394 | if(getgrnam_r(name, &grent, grbuf, sizeof grbuf, &p)) |
---|
395 | return NULL; |
---|
396 | return p; |
---|
397 | } |
---|
398 | |
---|
399 | int getgrgid_r( |
---|
400 | gid_t gid, |
---|
401 | struct group *grp, |
---|
402 | char *buffer, |
---|
403 | size_t bufsize, |
---|
404 | struct group **result |
---|
405 | ) |
---|
406 | { |
---|
407 | return getgr_r(NULL, gid, grp, buffer, bufsize, result); |
---|
408 | } |
---|
409 | |
---|
410 | struct group *getgrgid( |
---|
411 | gid_t gid |
---|
412 | ) |
---|
413 | { |
---|
414 | struct group *p; |
---|
415 | |
---|
416 | if(getgrgid_r(gid, &grent, grbuf, sizeof grbuf, &p)) |
---|
417 | return NULL; |
---|
418 | return p; |
---|
419 | } |
---|
420 | |
---|
421 | struct group *getgrent() |
---|
422 | { |
---|
423 | if (group_fp == NULL) |
---|
424 | return NULL; |
---|
425 | if (!scangr(group_fp, &grent, grbuf, sizeof grbuf)) |
---|
426 | return NULL; |
---|
427 | return &grent; |
---|
428 | } |
---|
429 | |
---|
430 | void setgrent(void) |
---|
431 | { |
---|
432 | init_etc_passwd_group(); |
---|
433 | |
---|
434 | if (group_fp != NULL) |
---|
435 | fclose(group_fp); |
---|
436 | group_fp = fopen("/etc/group", "r"); |
---|
437 | } |
---|
438 | |
---|
439 | void endgrent(void) |
---|
440 | { |
---|
441 | if (group_fp != NULL) |
---|
442 | fclose(group_fp); |
---|
443 | } |
---|