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/* $OpenBSD: pwcache.c,v 1.13 2015/11/25 23:16:01 jcs Exp $ */ |
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/* |
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* Copyright (c) 1989, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <sys/types.h> |
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#include <grp.h> |
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#include <pwd.h> |
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#include <stdio.h> |
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#include <string.h> |
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#define NCACHE 16 /* power of 2 */ |
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#define NLINES 4 /* associativity */ |
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#define MASK (NCACHE - 1) /* bits to store with */ |
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#define IDX(x, i) ((x & MASK) + i * NCACHE) |
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char * |
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user_from_uid(uid_t uid, int nouser) |
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{ |
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static struct ncache { |
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uid_t uid; |
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short noname; |
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char name[_PW_NAME_LEN + 1]; |
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} c_uid[NLINES * NCACHE]; |
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char pwbuf[_PW_BUF_LEN]; |
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struct passwd pwstore, *pw; |
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struct ncache *cp; |
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unsigned int i; |
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✓✗ |
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for (i = 0; i < NLINES; i++) { |
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cp = &c_uid[IDX(uid, i)]; |
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✓✓ |
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if (!*cp->name) { |
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fillit: |
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cp->uid = uid; |
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pw = NULL; |
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getpwuid_r(uid, &pwstore, pwbuf, sizeof(pwbuf), &pw); |
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✗✓ |
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if (pw == NULL) { |
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snprintf(cp->name, sizeof(cp->name), "%u", uid); |
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cp->noname = 1; |
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} else { |
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strlcpy(cp->name, pw->pw_name, sizeof(cp->name)); |
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} |
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} |
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✓✗ |
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if (cp->uid == uid) { |
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✓✓✗✓
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if (nouser && cp->noname) |
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return NULL; |
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return cp->name; |
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} |
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} |
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/* move everybody down a slot */ |
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for (i = 0; i < NLINES - 1; i++) { |
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struct ncache *next; |
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cp = &c_uid[IDX(uid, i)]; |
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next = &c_uid[IDX(uid, i + 1)]; |
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memcpy(next, cp, sizeof(*cp)); |
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} |
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cp = &c_uid[IDX(uid, 0)]; |
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goto fillit; |
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} |
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char * |
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group_from_gid(gid_t gid, int nogroup) |
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{ |
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static struct ncache { |
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gid_t gid; |
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short noname; |
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char name[_PW_NAME_LEN + 1]; |
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} c_gid[NLINES * NCACHE]; |
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char grbuf[_GR_BUF_LEN]; |
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struct group grstore, *gr; |
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struct ncache *cp; |
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unsigned int i; |
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✓✗ |
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for (i = 0; i < NLINES; i++) { |
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cp = &c_gid[IDX(gid, i)]; |
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✓✓ |
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if (!*cp->name) { |
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fillit: |
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cp->gid = gid; |
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gr = NULL; |
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getgrgid_r(gid, &grstore, grbuf, sizeof(grbuf), &gr); |
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✗✓ |
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if (gr == NULL) { |
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snprintf(cp->name, sizeof(cp->name), "%u", gid); |
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cp->noname = 1; |
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} else { |
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strlcpy(cp->name, gr->gr_name, sizeof(cp->name)); |
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} |
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} |
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✓✓ |
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if (cp->gid == gid) { |
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✓✓✗✓
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if (nogroup && cp->noname) |
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return NULL; |
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return cp->name; |
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} |
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} |
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/* move everybody down a slot */ |
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for (i = 0; i < NLINES - 1; i++) { |
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struct ncache *next; |
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cp = &c_gid[IDX(gid, i)]; |
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next = &c_gid[IDX(gid, i + 1)]; |
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memcpy(next, cp, sizeof(*cp)); |
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} |
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cp = &c_gid[IDX(gid, 0)]; |
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goto fillit; |
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} |