libc/pwcache: Some further work on the pwcache import.
[dragonfly.git] / bin / pax / cache.c
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1/*-
2 * Copyright (c) 1992 Keith Muller.
3 * Copyright (c) 1992, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Keith Muller of the University of California, San Diego.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
dc71b7ab 17 * 3. Neither the name of the University nor the names of its contributors
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18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#)cache.c 8.1 (Berkeley) 5/31/93
34 * $FreeBSD: src/bin/pax/cache.c,v 1.12.2.1 2001/08/01 05:03:11 obrien Exp $
418e7697 35 * $DragonFly: src/bin/pax/cache.c,v 1.7 2006/09/27 21:58:08 pavalos Exp $
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36 */
37
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38#include <sys/types.h>
39#include <sys/stat.h>
40#include <string.h>
41#include <stdio.h>
42#include <pwd.h>
43#include <grp.h>
44#include <unistd.h>
45#include <stdlib.h>
46#include "pax.h"
47#include "cache.h"
48#include "extern.h"
49
50/*
51 * routines that control user, group, uid and gid caches (for the archive
52 * member print routine).
53 * IMPORTANT:
54 * these routines cache BOTH hits and misses, a major performance improvement
55 */
56
57static int pwopn = 0; /* is password file open */
58static int gropn = 0; /* is group file open */
59static UIDC **uidtb = NULL; /* uid to name cache */
60static GIDC **gidtb = NULL; /* gid to name cache */
61static UIDC **usrtb = NULL; /* user name to uid cache */
62static GIDC **grptb = NULL; /* group name to gid cache */
63
64/*
65 * uidtb_start
418e7697 66 * creates an empty uidtb
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67 * Return:
68 * 0 if ok, -1 otherwise
69 */
70
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71int
72uidtb_start(void)
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73{
74 static int fail = 0;
75
76 if (uidtb != NULL)
77 return(0);
78 if (fail)
79 return(-1);
80 if ((uidtb = (UIDC **)calloc(UID_SZ, sizeof(UIDC *))) == NULL) {
81 ++fail;
82 paxwarn(1, "Unable to allocate memory for user id cache table");
83 return(-1);
84 }
85 return(0);
86}
87
88/*
89 * gidtb_start
418e7697 90 * creates an empty gidtb
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91 * Return:
92 * 0 if ok, -1 otherwise
93 */
94
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95int
96gidtb_start(void)
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97{
98 static int fail = 0;
99
100 if (gidtb != NULL)
101 return(0);
102 if (fail)
103 return(-1);
104 if ((gidtb = (GIDC **)calloc(GID_SZ, sizeof(GIDC *))) == NULL) {
105 ++fail;
106 paxwarn(1, "Unable to allocate memory for group id cache table");
107 return(-1);
108 }
109 return(0);
110}
111
112/*
113 * usrtb_start
418e7697 114 * creates an empty usrtb
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115 * Return:
116 * 0 if ok, -1 otherwise
117 */
118
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119int
120usrtb_start(void)
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121{
122 static int fail = 0;
123
124 if (usrtb != NULL)
125 return(0);
126 if (fail)
127 return(-1);
128 if ((usrtb = (UIDC **)calloc(UNM_SZ, sizeof(UIDC *))) == NULL) {
129 ++fail;
130 paxwarn(1, "Unable to allocate memory for user name cache table");
131 return(-1);
132 }
133 return(0);
134}
135
136/*
137 * grptb_start
418e7697 138 * creates an empty grptb
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139 * Return:
140 * 0 if ok, -1 otherwise
141 */
142
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143int
144grptb_start(void)
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145{
146 static int fail = 0;
147
148 if (grptb != NULL)
149 return(0);
150 if (fail)
151 return(-1);
152 if ((grptb = (GIDC **)calloc(GNM_SZ, sizeof(GIDC *))) == NULL) {
153 ++fail;
154 paxwarn(1,"Unable to allocate memory for group name cache table");
155 return(-1);
156 }
157 return(0);
158}
159
160/*
161 * name_uid()
162 * caches the name (if any) for the uid. If frc set, we always return the
163 * the stored name (if valid or invalid match). We use a simple hash table.
164 * Return
165 * Pointer to stored name (or a empty string)
166 */
167
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168char *
169name_uid(uid_t uid, int frc)
984263bc 170{
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171 struct passwd *pw;
172 UIDC *ptr;
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173
174 if ((uidtb == NULL) && (uidtb_start() < 0))
175 return("");
176
177 /*
178 * see if we have this uid cached
179 */
180 ptr = uidtb[uid % UID_SZ];
181 if ((ptr != NULL) && (ptr->valid > 0) && (ptr->uid == uid)) {
182 /*
183 * have an entry for this uid
184 */
185 if (frc || (ptr->valid == VALID))
186 return(ptr->name);
187 return("");
188 }
189
190 /*
191 * No entry for this uid, we will add it
192 */
193 if (!pwopn) {
194 setpassent(1);
195 ++pwopn;
196 }
197 if (ptr == NULL)
198 ptr = (UIDC *)malloc(sizeof(UIDC));
199
200 if ((pw = getpwuid(uid)) == NULL) {
201 /*
202 * no match for this uid in the local password file
203 * a string that is the uid in numeric format
204 */
205 if (ptr == NULL)
206 return("");
207 ptr->uid = uid;
208 ptr->valid = INVALID;
57fed2af 209 snprintf(ptr->name, sizeof(ptr->name), "%lu",
984263bc 210 (unsigned long)uid);
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211 if (frc == 0)
212 return("");
213 } else {
214 /*
215 * there is an entry for this uid in the password file
216 */
217 if (ptr == NULL)
218 return(pw->pw_name);
219 ptr->uid = uid;
57fed2af 220 strncpy(ptr->name, pw->pw_name, UNMLEN - 1);
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221 ptr->name[UNMLEN-1] = '\0';
222 ptr->valid = VALID;
223 }
224 return(ptr->name);
225}
226
227/*
228 * name_gid()
229 * caches the name (if any) for the gid. If frc set, we always return the
230 * the stored name (if valid or invalid match). We use a simple hash table.
231 * Return
232 * Pointer to stored name (or a empty string)
233 */
234
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235char *
236name_gid(gid_t gid, int frc)
984263bc 237{
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238 struct group *gr;
239 GIDC *ptr;
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240
241 if ((gidtb == NULL) && (gidtb_start() < 0))
242 return("");
243
244 /*
245 * see if we have this gid cached
246 */
247 ptr = gidtb[gid % GID_SZ];
248 if ((ptr != NULL) && (ptr->valid > 0) && (ptr->gid == gid)) {
249 /*
250 * have an entry for this gid
251 */
252 if (frc || (ptr->valid == VALID))
253 return(ptr->name);
254 return("");
255 }
256
257 /*
258 * No entry for this gid, we will add it
259 */
260 if (!gropn) {
261 setgroupent(1);
262 ++gropn;
263 }
264 if (ptr == NULL)
265 ptr = (GIDC *)malloc(sizeof(GIDC));
266
267 if ((gr = getgrgid(gid)) == NULL) {
268 /*
269 * no match for this gid in the local group file, put in
270 * a string that is the gid in numeric format
271 */
272 if (ptr == NULL)
273 return("");
274 ptr->gid = gid;
275 ptr->valid = INVALID;
57fed2af 276 snprintf(ptr->name, sizeof(ptr->name), "%lu",
984263bc 277 (unsigned long)gid);
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278 if (frc == 0)
279 return("");
280 } else {
281 /*
282 * there is an entry for this group in the group file
283 */
284 if (ptr == NULL)
285 return(gr->gr_name);
286 ptr->gid = gid;
57fed2af 287 strncpy(ptr->name, gr->gr_name, GNMLEN - 1);
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288 ptr->name[GNMLEN-1] = '\0';
289 ptr->valid = VALID;
290 }
291 return(ptr->name);
292}
293
294/*
295 * uid_name()
296 * caches the uid for a given user name. We use a simple hash table.
297 * Return
298 * the uid (if any) for a user name, or a -1 if no match can be found
299 */
300
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301int
302uid_name(char *name, uid_t *uid)
984263bc 303{
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304 struct passwd *pw;
305 UIDC *ptr;
306 int namelen;
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307
308 /*
309 * return -1 for mangled names
310 */
311 if (((namelen = strlen(name)) == 0) || (name[0] == '\0'))
312 return(-1);
313 if ((usrtb == NULL) && (usrtb_start() < 0))
314 return(-1);
315
316 /*
317 * look up in hash table, if found and valid return the uid,
318 * if found and invalid, return a -1
319 */
320 ptr = usrtb[st_hash(name, namelen, UNM_SZ)];
321 if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
322 if (ptr->valid == INVALID)
323 return(-1);
324 *uid = ptr->uid;
325 return(0);
326 }
327
328 if (!pwopn) {
329 setpassent(1);
330 ++pwopn;
331 }
332
333 if (ptr == NULL)
334 ptr = usrtb[st_hash(name, namelen, UNM_SZ)] =
335 (UIDC *)malloc(sizeof(UIDC));
336
337 /*
338 * no match, look it up, if no match store it as an invalid entry,
339 * or store the matching uid
340 */
341 if (ptr == NULL) {
342 if ((pw = getpwnam(name)) == NULL)
343 return(-1);
344 *uid = pw->pw_uid;
345 return(0);
346 }
57fed2af 347 strncpy(ptr->name, name, UNMLEN - 1);
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348 ptr->name[UNMLEN-1] = '\0';
349 if ((pw = getpwnam(name)) == NULL) {
350 ptr->valid = INVALID;
351 return(-1);
352 }
353 ptr->valid = VALID;
354 *uid = ptr->uid = pw->pw_uid;
355 return(0);
356}
357
358/*
359 * gid_name()
360 * caches the gid for a given group name. We use a simple hash table.
361 * Return
362 * the gid (if any) for a group name, or a -1 if no match can be found
363 */
364
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365int
366gid_name(char *name, gid_t *gid)
984263bc 367{
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368 struct group *gr;
369 GIDC *ptr;
370 int namelen;
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371
372 /*
373 * return -1 for mangled names
374 */
375 if (((namelen = strlen(name)) == 0) || (name[0] == '\0'))
376 return(-1);
377 if ((grptb == NULL) && (grptb_start() < 0))
378 return(-1);
379
380 /*
381 * look up in hash table, if found and valid return the uid,
382 * if found and invalid, return a -1
383 */
384 ptr = grptb[st_hash(name, namelen, GID_SZ)];
385 if ((ptr != NULL) && (ptr->valid > 0) && !strcmp(name, ptr->name)) {
386 if (ptr->valid == INVALID)
387 return(-1);
388 *gid = ptr->gid;
389 return(0);
390 }
391
392 if (!gropn) {
393 setgroupent(1);
394 ++gropn;
395 }
396 if (ptr == NULL)
397 ptr = grptb[st_hash(name, namelen, GID_SZ)] =
398 (GIDC *)malloc(sizeof(GIDC));
399
400 /*
401 * no match, look it up, if no match store it as an invalid entry,
402 * or store the matching gid
403 */
404 if (ptr == NULL) {
405 if ((gr = getgrnam(name)) == NULL)
406 return(-1);
407 *gid = gr->gr_gid;
408 return(0);
409 }
410
57fed2af 411 strncpy(ptr->name, name, GNMLEN - 1);
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412 ptr->name[GNMLEN-1] = '\0';
413 if ((gr = getgrnam(name)) == NULL) {
414 ptr->valid = INVALID;
415 return(-1);
416 }
417 ptr->valid = VALID;
418 *gid = ptr->gid = gr->gr_gid;
419 return(0);
420}