1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include "lint.h" 33 #include "file64.h" 34 #include <sys/types.h> 35 #include <mtlib.h> 36 #include <ctype.h> 37 #include <thread.h> 38 #include <synch.h> 39 #include <stdio.h> 40 #include "stdiom.h" 41 #include "libc.h" 42 43 static FILE *pwf; 44 static mutex_t _pwlock = DEFAULTMUTEX; 45 const char *PASSWD = "/etc/passwd"; 46 47 int 48 getpw(uid_t uid, char buf[]) 49 { 50 int n, c; 51 char *bp; 52 FILE *fp; 53 rmutex_t *lk; 54 55 if (pwf == NULL) { 56 fp = fopen(PASSWD, "rF"); 57 lmutex_lock(&_pwlock); 58 if (pwf == NULL) { 59 if ((pwf = fp) == NULL) { 60 lmutex_unlock(&_pwlock); 61 return (1); 62 } 63 fp = NULL; 64 } 65 lmutex_unlock(&_pwlock); 66 if (fp != NULL) /* someone beat us to it */ 67 (void) fclose(fp); 68 } 69 70 FLOCKFILE(lk, pwf); 71 _rewind_unlocked(pwf); 72 73 for (;;) { 74 bp = buf; 75 while ((c = GETC(pwf)) != '\n') { 76 if (c == EOF) { 77 FUNLOCKFILE(lk); 78 return (1); 79 } 80 *bp++ = (char)c; 81 } 82 *bp = '\0'; 83 bp = buf; 84 n = 3; 85 while (--n) 86 while ((c = *bp++) != ':') 87 if (c == '\n') { 88 FUNLOCKFILE(lk); 89 return (1); 90 } 91 while ((c = *bp++) != ':') 92 if (isdigit(c)) 93 n = n*10+c-'0'; 94 else 95 continue; 96 if (n == uid) { 97 FUNLOCKFILE(lk); 98 return (0); 99 } 100 } 101 } 102