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 #include "lint.h" 31 #include "file64.h" 32 #include <sys/types.h> 33 #include <mtlib.h> 34 #include <ctype.h> 35 #include <thread.h> 36 #include <synch.h> 37 #include <stdio.h> 38 #include "stdiom.h" 39 #include "libc.h" 40 41 static FILE *pwf; 42 static mutex_t _pwlock = DEFAULTMUTEX; 43 const char *PASSWD = "/etc/passwd"; 44 45 int 46 getpw(uid_t uid, char buf[]) 47 { 48 int n, c; 49 char *bp; 50 FILE *fp; 51 rmutex_t *lk; 52 53 if (pwf == NULL) { 54 fp = fopen(PASSWD, "rF"); 55 lmutex_lock(&_pwlock); 56 if (pwf == NULL) { 57 if ((pwf = fp) == NULL) { 58 lmutex_unlock(&_pwlock); 59 return (1); 60 } 61 fp = NULL; 62 } 63 lmutex_unlock(&_pwlock); 64 if (fp != NULL) /* someone beat us to it */ 65 (void) fclose(fp); 66 } 67 68 FLOCKFILE(lk, pwf); 69 _rewind_unlocked(pwf); 70 71 for (;;) { 72 bp = buf; 73 while ((c = GETC(pwf)) != '\n') { 74 if (c == EOF) { 75 FUNLOCKFILE(lk); 76 return (1); 77 } 78 *bp++ = (char)c; 79 } 80 *bp = '\0'; 81 bp = buf; 82 n = 3; 83 while (--n) 84 while ((c = *bp++) != ':') 85 if (c == '\n') { 86 FUNLOCKFILE(lk); 87 return (1); 88 } 89 while ((c = *bp++) != ':') 90 if (isdigit(c)) 91 n = n*10+c-'0'; 92 else 93 continue; 94 if (n == uid) { 95 FUNLOCKFILE(lk); 96 return (0); 97 } 98 } 99 } 100