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      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