1 /* $OpenBSD: pwcache.c,v 1.9 2005/08/08 08:05:34 espie Exp $ */ 2 /* 3 * Copyright (c) 1989, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* OPENBSD ORIGINAL: lib/libc/gen/pwcache.c */ 32 33 #include "includes.h" 34 35 #include <sys/types.h> 36 37 #include <grp.h> 38 #include <pwd.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 43 #define NCACHE 64 /* power of 2 */ 44 #define MASK (NCACHE - 1) /* bits to store with */ 45 46 #ifndef HAVE_USER_FROM_UID 47 char * 48 user_from_uid(uid_t uid, int nouser) 49 { 50 static struct ncache { 51 uid_t uid; 52 char *name; 53 } c_uid[NCACHE]; 54 static int pwopen; 55 static char nbuf[15]; /* 32 bits == 10 digits */ 56 struct passwd *pw; 57 struct ncache *cp; 58 59 cp = c_uid + (uid & MASK); 60 if (cp->uid != uid || cp->name == NULL) { 61 if (pwopen == 0) { 62 #ifdef HAVE_SETPASSENT 63 setpassent(1); 64 #endif 65 pwopen = 1; 66 } 67 if ((pw = getpwuid(uid)) == NULL) { 68 if (nouser) 69 return (NULL); 70 (void)snprintf(nbuf, sizeof(nbuf), "%lu", (u_long)uid); 71 } 72 cp->uid = uid; 73 if (cp->name != NULL) 74 free(cp->name); 75 cp->name = strdup(pw ? pw->pw_name : nbuf); 76 } 77 return (cp->name); 78 } 79 #endif 80 81 #ifndef HAVE_GROUP_FROM_GID 82 char * 83 group_from_gid(gid_t gid, int nogroup) 84 { 85 static struct ncache { 86 gid_t gid; 87 char *name; 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 == NULL) { 96 if (gropen == 0) { 97 #ifdef HAVE_SETGROUPENT 98 setgroupent(1); 99 #endif 100 gropen = 1; 101 } 102 if ((gr = getgrgid(gid)) == NULL) { 103 if (nogroup) 104 return (NULL); 105 (void)snprintf(nbuf, sizeof(nbuf), "%lu", (u_long)gid); 106 } 107 cp->gid = gid; 108 if (cp->name != NULL) 109 free(cp->name); 110 cp->name = strdup(gr ? gr->gr_name : nbuf); 111 } 112 return (cp->name); 113 } 114 #endif 115