usr/src/cmd/nscd/gethost.c

   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  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"
  27
  28 /*
  29  * Routines to handle gethost* calls in nscd
  30  */
  31
  32 #include <string.h>
  33 #include <stdlib.h>
  34 #include <sys/types.h>
  35 #include <sys/socket.h>
  36 #include <netinet/in.h>
  37 #include <arpa/inet.h>
  38 #include "cache.h"
  39
  40 #define hnam_db ctx->nsc_db[0]
  41 #define addr_db ctx->nsc_db[1]
  42
  43 #define NSC_NAME_HOSTS_BYNAME   "gethostbyname"
  44 #define NSC_NAME_HOSTS_BYADDR   "gethostbyaddr"
  45
  46 static int hostaddr_compar(const void *, const void *);
  47 static uint_t hostaddr_gethash(nss_XbyY_key_t *, int);
  48 static void hostaddr_getlogstr(char *, char *, size_t, nss_XbyY_args_t *);
  49
  50 void
  51 host_init_ctx(nsc_ctx_t *ctx) {
  52         ctx->dbname = NSS_DBNAM_HOSTS;
  53         ctx->db_count = 2;
  54         ctx->file_name = "/etc/inet/hosts";
  55
  56         hnam_db = make_cache(nsc_key_cis,
  57                         NSS_DBOP_HOSTS_BYNAME,
  58                         NSC_NAME_HOSTS_BYNAME,
  59                         NULL, NULL, NULL, nsc_ht_default, -1);
  60
  61         addr_db = make_cache(nsc_key_other,
  62                         NSS_DBOP_HOSTS_BYADDR,
  63                         NSC_NAME_HOSTS_BYADDR,
  64                         hostaddr_compar,
  65                         hostaddr_getlogstr,
  66                         hostaddr_gethash, nsc_ht_default, -1);
  67 }
  68
  69 static void
  70 hostaddr_getlogstr(char *name, char *whoami, size_t len,
  71                         nss_XbyY_args_t *argp) {
  72         char addr[INET6_ADDRSTRLEN];
  73
  74         if (inet_ntop(argp->key.hostaddr.type, argp->key.hostaddr.addr, addr,
  75                         sizeof (addr)) == NULL) {
  76                 (void) snprintf(whoami, len, "%s", name);
  77         } else {
  78                 (void) snprintf(whoami, len, "%s [key=%s, addrtype=%d]",
  79                         name, addr, argp->key.hostaddr.type);
  80         }
  81 }
  82
  83 static int
  84 hostaddr_compar(const void *n1, const void *n2) {
  85         nsc_entry_t     *e1, *e2;
  86         int             res, l1, l2;
  87
  88         e1 = (nsc_entry_t *)n1;
  89         e2 = (nsc_entry_t *)n2;
  90         l1 = e1->key.hostaddr.len;
  91         l2 = e2->key.hostaddr.len;
  92         res = memcmp(e1->key.hostaddr.addr, e2->key.hostaddr.addr,
  93                 (l2 > l1)?l1:l2);
  94         return ((res) ? _NSC_INT_KEY_CMP(res, 0) : _NSC_INT_KEY_CMP(l1, l2));
  95 }
  96
  97 static uint_t
  98 hostaddr_gethash(nss_XbyY_key_t *key, int htsize) {
  99         return (db_gethash(key->hostaddr.addr,
 100                         key->hostaddr.len, htsize));
 101 }