1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 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. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char rcsid[] = "$OpenBSD: pwcache.c,v 1.5 2001/06/27 00:58:54 lebel Exp $"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/types.h> 39 40 #include <grp.h> 41 #include <pwd.h> 42 #include <stdio.h> 43 #include <string.h> 44 45 #define NCACHE 64 /* power of 2 */ 46 #define MASK (NCACHE - 1) /* bits to store with */ 47 48 char * 49 user_from_uid(uid, nouser) 50 uid_t uid; 51 int nouser; 52 { 53 static struct ncache { 54 uid_t uid; 55 char name[_PW_NAME_LEN + 1]; 56 } c_uid[NCACHE]; 57 static int pwopen; 58 static char nbuf[15]; /* 32 bits == 10 digits */ 59 register struct passwd *pw; 60 register struct ncache *cp; 61 62 cp = c_uid + (uid & MASK); 63 if (cp->uid != uid || !*cp->name) { 64 if (pwopen == 0) { 65 setpassent(1); 66 pwopen = 1; 67 } 68 if ((pw = getpwuid(uid)) == NULL) { 69 if (nouser) 70 return (NULL); 71 (void)snprintf(nbuf, sizeof(nbuf), "%u", uid); 72 return (nbuf); 73 } 74 cp->uid = uid; 75 strlcpy(cp->name, pw->pw_name, sizeof(cp->name)); 76 } 77 return (cp->name); 78 } 79 80 char * 81 group_from_gid(gid, nogroup) 82 gid_t gid; 83 int nogroup; 84 { 85 static struct ncache { 86 gid_t gid; 87 char name[_PW_NAME_LEN + 1]; 88 } c_gid[NCACHE]; 89 static int gropen; 90 static char nbuf[15]; /* 32 bits == 10 digits */ 91 struct group *gr; 92 struct ncache *cp; 93 94 cp = c_gid + (gid & MASK); 95 if (cp->gid != gid || !*cp->name) { 96 if (gropen == 0) { 97 setgroupent(1); 98 gropen = 1; 99 } 100 if ((gr = getgrgid(gid)) == NULL) { 101 if (nogroup) 102 return (NULL); 103 (void)snprintf(nbuf, sizeof(nbuf), "%u", gid); 104 return (nbuf); 105 } 106 cp->gid = gid; 107 strlcpy(cp->name, gr->gr_name, sizeof(cp->name)); 108 } 109 return (cp->name); 110 } 111