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      1 /*	$NetBSD: pcnfsd_cache.c,v 1.5 2018/01/23 21:06:25 sevan Exp $	*/
      2 
      3 /* RE_SID: @(%)/usr/dosnfs/shades_SCCS/unix/pcnfsd/v2/src/SCCS/s.pcnfsd_cache.c 1.1 91/09/03 12:45:14 SMI */
      4 /*
      5 **=====================================================================
      6 ** Copyright (c) 1986,1987,1988,1989,1990,1991 by Sun Microsystems, Inc.
      7 **	@(#)pcnfsd_cache.c	1.1	9/3/91
      8 **=====================================================================
      9 */
     10 /*
     11 **=====================================================================
     12 **             I N C L U D E   F I L E   S E C T I O N                *
     13 **                                                                    *
     14 ** If your port requires different include files, add a suitable      *
     15 ** #define in the customization section, and make the inclusion or    *
     16 ** exclusion of the files conditional on this.                        *
     17 **=====================================================================
     18 */
     19 
     20 #include <errno.h>
     21 #include <pwd.h>
     22 #include <stdio.h>
     23 #include <string.h>
     24 #include <unistd.h>
     25 
     26 #include "common.h"
     27 #include "pcnfsd.h"
     28 #include "extern.h"
     29 
     30 /*
     31 **---------------------------------------------------------------------
     32 **                       Misc. variable definitions
     33 **---------------------------------------------------------------------
     34 */
     35 
     36 #ifdef USER_CACHE
     37 #define CACHE_SIZE 16		/* keep it small, as linear searches are done */
     38 struct cache {
     39 	int     cuid;
     40 	int     cgid;
     41 	char    cpw[32];
     42 	char    cuname[10];	/* keep this even for machines with alignment
     43 				 * problems */
     44 }       User_cache[CACHE_SIZE];
     45 
     46 
     47 /*
     48 **---------------------------------------------------------------------
     49 **                 User cache support procedures
     50 **---------------------------------------------------------------------
     51 */
     52 
     53 
     54 int
     55 check_cache(char *name, char *pw, int *p_uid, int *p_gid)
     56 {
     57 	int     i;
     58 	int     c1, c2;
     59 
     60 	for (i = 0; i < CACHE_SIZE; i++) {
     61 		if (!strcmp(User_cache[i].cuname, name)) {
     62 			c1 = strlen(pw);
     63 			c2 = strlen(User_cache[i].cpw);
     64 			if ((!c1 && !c2) ||
     65 			    !(strcmp(User_cache[i].cpw,
     66 				    crypt(pw, User_cache[i].cpw)))) {
     67 				*p_uid = User_cache[i].cuid;
     68 				*p_gid = User_cache[i].cgid;
     69 				return (1);
     70 			}
     71 			User_cache[i].cuname[0] = '\0';	/* nuke entry */
     72 			return (0);
     73 		}
     74 	}
     75 	return (0);
     76 }
     77 
     78 void
     79 add_cache_entry(struct passwd *p)
     80 {
     81 	int     i;
     82 
     83 	for (i = CACHE_SIZE - 1; i > 0; i--)
     84 		User_cache[i] = User_cache[i - 1];
     85 	User_cache[0].cuid = p->pw_uid;
     86 	User_cache[0].cgid = p->pw_gid;
     87 	(void) strlcpy(User_cache[0].cpw, p->pw_passwd,
     88 	    sizeof(User_cache[0].cpw));
     89 	(void) strlcpy(User_cache[0].cuname, p->pw_name,
     90 	    sizeof(User_cache[0].cuname));
     91 }
     92 
     93 #endif				/* USER_CACHE */
     94