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getpwent.c revision 1.1.1.1.2.1
      1  1.1.1.1.2.1  gwr /*	$NetBSD: getpwent.c,v 1.1.1.1.2.1 1995/10/11 23:52:08 gwr Exp $	*/
      2          1.1  gwr 
      3          1.1  gwr /*
      4          1.1  gwr  * Copyright (c) 1995 Gordon W. Ross
      5          1.1  gwr  * All rights reserved.
      6          1.1  gwr  *
      7          1.1  gwr  * Redistribution and use in source and binary forms, with or without
      8          1.1  gwr  * modification, are permitted provided that the following conditions
      9          1.1  gwr  * are met:
     10          1.1  gwr  * 1. Redistributions of source code must retain the above copyright
     11          1.1  gwr  *    notice, this list of conditions and the following disclaimer.
     12          1.1  gwr  * 2. Redistributions in binary form must reproduce the above copyright
     13          1.1  gwr  *    notice, this list of conditions and the following disclaimer in the
     14          1.1  gwr  *    documentation and/or other materials provided with the distribution.
     15          1.1  gwr  * 3. The name of the author may not be used to endorse or promote products
     16          1.1  gwr  *    derived from this software without specific prior written permission.
     17          1.1  gwr  * 4. All advertising materials mentioning features or use of this software
     18          1.1  gwr  *    must display the following acknowledgement:
     19          1.1  gwr  *      This product includes software developed by Gordon W. Ross
     20          1.1  gwr  *
     21          1.1  gwr  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22          1.1  gwr  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23          1.1  gwr  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24          1.1  gwr  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25          1.1  gwr  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26          1.1  gwr  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27          1.1  gwr  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28          1.1  gwr  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29          1.1  gwr  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30          1.1  gwr  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31          1.1  gwr  */
     32          1.1  gwr 
     33          1.1  gwr /*
     34          1.1  gwr  * Smaller replacement for: libc/gen/getpwent.c
     35          1.1  gwr  * Needed by programs like: rsh, rlogin
     36          1.1  gwr  */
     37          1.1  gwr 
     38          1.1  gwr #include <stdio.h>
     39          1.1  gwr #include <string.h>
     40          1.1  gwr #include <pwd.h>
     41          1.1  gwr 
     42          1.1  gwr #define	PWNULL	(struct passwd *)0
     43          1.1  gwr #define MAXFIELD 8
     44          1.1  gwr 
     45          1.1  gwr static char *pw_file = "/etc/passwd";
     46          1.1  gwr static FILE *pw_fp;
     47          1.1  gwr static char  pw_line[128];
     48          1.1  gwr static struct passwd pw_ent;
     49          1.1  gwr 
     50          1.1  gwr /*
     51          1.1  gwr  * Open passwd file if necessary, and
     52          1.1  gwr  * get the next entry.
     53          1.1  gwr  */
     54          1.1  gwr struct passwd *
     55          1.1  gwr getpwent()
     56          1.1  gwr {
     57          1.1  gwr 	char *fv[MAXFIELD];
     58  1.1.1.1.2.1  gwr 	char *p;
     59          1.1  gwr 	int   fc;
     60          1.1  gwr 
     61          1.1  gwr 	/* Open passwd file if not already. */
     62          1.1  gwr 	if (pw_fp == NULL)
     63          1.1  gwr 		pw_fp = fopen(pw_file, "r");
     64          1.1  gwr 	/* Still NULL.  No passwd file? */
     65          1.1  gwr 	if (pw_fp == NULL)
     66          1.1  gwr 		return PWNULL;
     67          1.1  gwr 
     68          1.1  gwr readnext:
     69  1.1.1.1.2.1  gwr 	/* Read the next line... */
     70          1.1  gwr 	if (fgets(pw_line, sizeof(pw_line), pw_fp) == NULL)
     71          1.1  gwr 		return PWNULL;
     72          1.1  gwr 
     73          1.1  gwr 	/* ...and parse it. */
     74          1.1  gwr 	p = pw_line;
     75          1.1  gwr 	fc = 0;
     76          1.1  gwr 	while (fc < MAXFIELD) {
     77  1.1.1.1.2.1  gwr 		fv[fc] = strsep(&p, ":\n");
     78  1.1.1.1.2.1  gwr 		if (fv[fc] == NULL)
     79          1.1  gwr 			break;
     80  1.1.1.1.2.1  gwr 		fc++;
     81          1.1  gwr 	}
     82          1.1  gwr 
     83          1.1  gwr 	/* Need at least 0..5 */
     84          1.1  gwr 	if (fc < 6)
     85          1.1  gwr 		goto readnext;
     86          1.1  gwr 	while (fc < MAXFIELD)
     87          1.1  gwr 		fv[fc++] = "";
     88          1.1  gwr 
     89  1.1.1.1.2.1  gwr 	/* Build the pw entry... */
     90          1.1  gwr 	pw_ent.pw_name   = fv[0];
     91          1.1  gwr 	pw_ent.pw_passwd = fv[1];
     92          1.1  gwr 	pw_ent.pw_uid = atoi(fv[2]);
     93          1.1  gwr 	pw_ent.pw_gid = atoi(fv[3]);
     94          1.1  gwr 	pw_ent.pw_gecos = fv[4];
     95          1.1  gwr 	pw_ent.pw_dir   = fv[5];
     96          1.1  gwr 	pw_ent.pw_shell = fv[6];
     97          1.1  gwr 
     98          1.1  gwr 	return (&pw_ent);
     99          1.1  gwr }
    100          1.1  gwr 
    101          1.1  gwr /* internal for setpwent() */
    102          1.1  gwr int
    103          1.1  gwr setpassent(stayopen)
    104          1.1  gwr 	int stayopen;
    105          1.1  gwr {
    106          1.1  gwr 	if (pw_fp)
    107          1.1  gwr 		rewind(pw_fp);
    108          1.1  gwr }
    109          1.1  gwr 
    110          1.1  gwr /* rewind to the beginning. */
    111          1.1  gwr void
    112          1.1  gwr setpwent()
    113          1.1  gwr {
    114          1.1  gwr 	(void) setpassent(0);
    115          1.1  gwr }
    116          1.1  gwr 
    117          1.1  gwr /* done with the passwd file */
    118          1.1  gwr void
    119          1.1  gwr endpwent()
    120          1.1  gwr {
    121  1.1.1.1.2.1  gwr 	if (pw_fp) {
    122          1.1  gwr 		fclose(pw_fp);
    123  1.1.1.1.2.1  gwr 		pw_fp = NULL;
    124  1.1.1.1.2.1  gwr 	}
    125          1.1  gwr }
    126          1.1  gwr 
    127          1.1  gwr struct passwd *
    128          1.1  gwr getpwnam(name)
    129          1.1  gwr 	const char *name;
    130          1.1  gwr {
    131          1.1  gwr 	struct passwd *pw;
    132          1.1  gwr 
    133          1.1  gwr 	setpwent();
    134          1.1  gwr 	while ((pw = getpwent()) != PWNULL)
    135          1.1  gwr 		if (!strcmp(pw->pw_name, name))
    136          1.1  gwr 			break;
    137          1.1  gwr 
    138          1.1  gwr 	endpwent();
    139          1.1  gwr 	return(pw);
    140          1.1  gwr }
    141          1.1  gwr 
    142          1.1  gwr struct passwd *
    143          1.1  gwr getpwuid(uid)
    144          1.1  gwr 	uid_t uid;
    145          1.1  gwr {
    146          1.1  gwr 	struct passwd *pw;
    147          1.1  gwr 
    148          1.1  gwr 	setpwent();
    149          1.1  gwr 	while ((pw = getpwent()) != PWNULL)
    150          1.1  gwr 		if (pw->pw_uid == uid)
    151          1.1  gwr 			break;
    152          1.1  gwr 
    153          1.1  gwr 	endpwent();
    154          1.1  gwr 	return(pw);
    155          1.1  gwr }
    156          1.1  gwr 
    157          1.1  gwr #ifdef	TEST_MAIN
    158          1.1  gwr main() {
    159          1.1  gwr 	struct passwd *pw;
    160          1.1  gwr 
    161  1.1.1.1.2.1  gwr 	printf("#name, password, uid, gid, comment, dir, shell\n");
    162          1.1  gwr 
    163          1.1  gwr 	while ((pw = getpwent()) != NULL) {
    164          1.1  gwr 		printf("%s:%s:", pw->pw_name, pw->pw_passwd);
    165          1.1  gwr 		printf("%d:%d:", pw->pw_uid, pw->pw_gid);
    166          1.1  gwr 		printf("%s:", pw->pw_gecos);
    167          1.1  gwr 		printf("%s:", pw->pw_dir);
    168          1.1  gwr 		printf("%s\n", pw->pw_shell);
    169          1.1  gwr 	}
    170          1.1  gwr }
    171          1.1  gwr #endif
    172