gethost.c revision 2830:5228d1267a01 
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
46static int hostaddr_compar(const void *, const void *);
47static uint_t hostaddr_gethash(nss_XbyY_key_t *, int);
48static void hostaddr_getlogstr(char *, char *, size_t, nss_XbyY_args_t *);
49
50void
51host_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
69static void
70hostaddr_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
83static int
84hostaddr_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
97static uint_t
98hostaddr_gethash(nss_XbyY_key_t *key, int htsize) {
99	return (db_gethash(key->hostaddr.addr,
100			key->hostaddr.len, htsize));
101}
102