1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * 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 sccsid[] = "@(#)pwcache.c 5.4 (Berkeley) 6/1/90"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/types.h> 39 #include <utmp.h> 40 #include <pwd.h> 41 #include <grp.h> 42 #include <stdio.h> 43 44 #define NCACHE 64 /* power of 2 */ 45 #define MASK NCACHE - 1 /* bits to store with */ 46 47 static int pwopen = 0; 48 static int gropen = 0; 49 50 char * 51 user_from_uid(uid, nouser) 52 uid_t uid; 53 int nouser; 54 { 55 static struct ncache { 56 uid_t uid; 57 char name[UT_NAMESIZE + 1]; 58 } c_uid[NCACHE]; 59 static char nbuf[15]; /* 32 bits == 10 digits */ 60 register struct passwd *pw; 61 register struct ncache *cp; 62 63 cp = c_uid + (uid & MASK); 64 if (cp->uid != uid || !*cp->name) { 65 if (pwopen == 0) { 66 setpassent(1); 67 pwopen++; 68 } 69 if (!(pw = getpwuid(uid))) { 70 if (nouser) 71 return((char *)NULL); 72 (void)sprintf(nbuf, "%u", uid); 73 return(nbuf); 74 } 75 cp->uid = uid; 76 (void)strncpy(cp->name, pw->pw_name, UT_NAMESIZE); 77 cp->name[UT_NAMESIZE] = '\0'; 78 } 79 return(cp->name); 80 } 81 82 char * 83 group_from_gid(gid, nogroup) 84 gid_t gid; 85 int nogroup; 86 { 87 static struct ncache { 88 gid_t gid; 89 char name[UT_NAMESIZE]; 90 } c_gid[NCACHE]; 91 static char nbuf[15]; /* 32 bits == 10 digits */ 92 register struct group *gr; 93 register struct ncache *cp; 94 95 cp = c_gid + (gid & MASK); 96 if (cp->gid != gid || !*cp->name) { 97 if (gropen == 0) { 98 setgroupent(1); 99 gropen++; 100 } 101 if (!(gr = getgrgid(gid))) { 102 if (nogroup) 103 return((char *)NULL); 104 (void)sprintf(nbuf, "%u", gid); 105 return(nbuf); 106 } 107 cp->gid = gid; 108 (void)strncpy(cp->name, gr->gr_name, UT_NAMESIZE); 109 cp->name[UT_NAMESIZE] = '\0'; 110 } 111 return(cp->name); 112 } 113