1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * Copyright 1997-2002 Sun Microsystems, Inc. All rights reserved. 3*0Sstevel@tonic-gate * Use is subject to license terms. 4*0Sstevel@tonic-gate */ 5*0Sstevel@tonic-gate 6*0Sstevel@tonic-gate /* 7*0Sstevel@tonic-gate * Copyright (c) 1996-1999 by Internet Software Consortium. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * Permission to use, copy, modify, and distribute this software for any 10*0Sstevel@tonic-gate * purpose with or without fee is hereby granted, provided that the above 11*0Sstevel@tonic-gate * copyright notice and this permission notice appear in all copies. 12*0Sstevel@tonic-gate * 13*0Sstevel@tonic-gate * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 14*0Sstevel@tonic-gate * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 15*0Sstevel@tonic-gate * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 16*0Sstevel@tonic-gate * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 17*0Sstevel@tonic-gate * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 18*0Sstevel@tonic-gate * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 19*0Sstevel@tonic-gate * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 20*0Sstevel@tonic-gate * SOFTWARE. 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate 23*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 24*0Sstevel@tonic-gate 25*0Sstevel@tonic-gate #if defined(LIBC_SCCS) && !defined(lint) 26*0Sstevel@tonic-gate static const char rcsid[] = "$Id: dns.c,v 1.16 2001/05/29 05:48:26 marka Exp $"; 27*0Sstevel@tonic-gate #endif 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate /* 30*0Sstevel@tonic-gate * dns.c --- this is the top-level accessor function for the dns 31*0Sstevel@tonic-gate */ 32*0Sstevel@tonic-gate 33*0Sstevel@tonic-gate #include "port_before.h" 34*0Sstevel@tonic-gate 35*0Sstevel@tonic-gate #include <stdlib.h> 36*0Sstevel@tonic-gate #include <string.h> 37*0Sstevel@tonic-gate #include <errno.h> 38*0Sstevel@tonic-gate 39*0Sstevel@tonic-gate #include <sys/types.h> 40*0Sstevel@tonic-gate #include <netinet/in.h> 41*0Sstevel@tonic-gate #include <arpa/nameser.h> 42*0Sstevel@tonic-gate #include <resolv.h> 43*0Sstevel@tonic-gate 44*0Sstevel@tonic-gate #include <resolv.h> 45*0Sstevel@tonic-gate 46*0Sstevel@tonic-gate #include <isc/memcluster.h> 47*0Sstevel@tonic-gate #include <irs.h> 48*0Sstevel@tonic-gate 49*0Sstevel@tonic-gate #include "port_after.h" 50*0Sstevel@tonic-gate 51*0Sstevel@tonic-gate #include "irs_p.h" 52*0Sstevel@tonic-gate #include "hesiod.h" 53*0Sstevel@tonic-gate #include "dns_p.h" 54*0Sstevel@tonic-gate 55*0Sstevel@tonic-gate /* forward */ 56*0Sstevel@tonic-gate 57*0Sstevel@tonic-gate static void dns_close(struct irs_acc *); 58*0Sstevel@tonic-gate static struct __res_state * dns_res_get(struct irs_acc *); 59*0Sstevel@tonic-gate static void dns_res_set(struct irs_acc *, struct __res_state *, 60*0Sstevel@tonic-gate void (*)(void *)); 61*0Sstevel@tonic-gate 62*0Sstevel@tonic-gate /* public */ 63*0Sstevel@tonic-gate 64*0Sstevel@tonic-gate struct irs_acc * 65*0Sstevel@tonic-gate irs_dns_acc(const char *options) { 66*0Sstevel@tonic-gate struct irs_acc *acc; 67*0Sstevel@tonic-gate struct dns_p *dns; 68*0Sstevel@tonic-gate 69*0Sstevel@tonic-gate UNUSED(options); 70*0Sstevel@tonic-gate 71*0Sstevel@tonic-gate if (!(acc = memget(sizeof *acc))) { 72*0Sstevel@tonic-gate errno = ENOMEM; 73*0Sstevel@tonic-gate return (NULL); 74*0Sstevel@tonic-gate } 75*0Sstevel@tonic-gate memset(acc, 0x5e, sizeof *acc); 76*0Sstevel@tonic-gate if (!(dns = memget(sizeof *dns))) { 77*0Sstevel@tonic-gate errno = ENOMEM; 78*0Sstevel@tonic-gate memput(acc, sizeof *acc); 79*0Sstevel@tonic-gate return (NULL); 80*0Sstevel@tonic-gate } 81*0Sstevel@tonic-gate memset(dns, 0x5e, sizeof *dns); 82*0Sstevel@tonic-gate dns->res = NULL; 83*0Sstevel@tonic-gate dns->free_res = NULL; 84*0Sstevel@tonic-gate if (hesiod_init(&dns->hes_ctx) < 0) { 85*0Sstevel@tonic-gate /* 86*0Sstevel@tonic-gate * We allow the dns accessor class to initialize 87*0Sstevel@tonic-gate * despite hesiod failing to initialize correctly, 88*0Sstevel@tonic-gate * since dns host queries don't depend on hesiod. 89*0Sstevel@tonic-gate */ 90*0Sstevel@tonic-gate dns->hes_ctx = NULL; 91*0Sstevel@tonic-gate } 92*0Sstevel@tonic-gate acc->private = dns; 93*0Sstevel@tonic-gate #ifdef WANT_IRS_GR 94*0Sstevel@tonic-gate acc->gr_map = irs_dns_gr; 95*0Sstevel@tonic-gate #else 96*0Sstevel@tonic-gate acc->gr_map = NULL; 97*0Sstevel@tonic-gate #endif 98*0Sstevel@tonic-gate #ifdef WANT_IRS_PW 99*0Sstevel@tonic-gate acc->pw_map = irs_dns_pw; 100*0Sstevel@tonic-gate #else 101*0Sstevel@tonic-gate acc->pw_map = NULL; 102*0Sstevel@tonic-gate #endif 103*0Sstevel@tonic-gate acc->sv_map = irs_dns_sv; 104*0Sstevel@tonic-gate acc->pr_map = irs_dns_pr; 105*0Sstevel@tonic-gate acc->ho_map = irs_dns_ho; 106*0Sstevel@tonic-gate acc->nw_map = irs_dns_nw; 107*0Sstevel@tonic-gate acc->ng_map = irs_nul_ng; 108*0Sstevel@tonic-gate acc->res_get = dns_res_get; 109*0Sstevel@tonic-gate acc->res_set = dns_res_set; 110*0Sstevel@tonic-gate acc->close = dns_close; 111*0Sstevel@tonic-gate return (acc); 112*0Sstevel@tonic-gate } 113*0Sstevel@tonic-gate 114*0Sstevel@tonic-gate /* methods */ 115*0Sstevel@tonic-gate static struct __res_state * 116*0Sstevel@tonic-gate dns_res_get(struct irs_acc *this) { 117*0Sstevel@tonic-gate struct dns_p *dns = (struct dns_p *)this->private; 118*0Sstevel@tonic-gate 119*0Sstevel@tonic-gate if (dns->res == NULL) { 120*0Sstevel@tonic-gate struct __res_state *res; 121*0Sstevel@tonic-gate res = (struct __res_state *)malloc(sizeof *res); 122*0Sstevel@tonic-gate if (res == NULL) 123*0Sstevel@tonic-gate return (NULL); 124*0Sstevel@tonic-gate memset(dns->res, 0, sizeof *dns->res); 125*0Sstevel@tonic-gate dns_res_set(this, res, free); 126*0Sstevel@tonic-gate } 127*0Sstevel@tonic-gate 128*0Sstevel@tonic-gate if ((dns->res->options & RES_INIT) == 0 && 129*0Sstevel@tonic-gate res_ninit(dns->res) < 0) 130*0Sstevel@tonic-gate return (NULL); 131*0Sstevel@tonic-gate 132*0Sstevel@tonic-gate return (dns->res); 133*0Sstevel@tonic-gate } 134*0Sstevel@tonic-gate 135*0Sstevel@tonic-gate static void 136*0Sstevel@tonic-gate dns_res_set(struct irs_acc *this, struct __res_state *res, 137*0Sstevel@tonic-gate void (*free_res)(void *)) { 138*0Sstevel@tonic-gate struct dns_p *dns = (struct dns_p *)this->private; 139*0Sstevel@tonic-gate 140*0Sstevel@tonic-gate if (dns->res && dns->free_res) { 141*0Sstevel@tonic-gate res_nclose(dns->res); 142*0Sstevel@tonic-gate (*dns->free_res)(dns->res); 143*0Sstevel@tonic-gate } 144*0Sstevel@tonic-gate dns->res = res; 145*0Sstevel@tonic-gate dns->free_res = free_res; 146*0Sstevel@tonic-gate } 147*0Sstevel@tonic-gate 148*0Sstevel@tonic-gate static void 149*0Sstevel@tonic-gate dns_close(struct irs_acc *this) { 150*0Sstevel@tonic-gate struct dns_p *dns; 151*0Sstevel@tonic-gate 152*0Sstevel@tonic-gate dns = (struct dns_p *)this->private; 153*0Sstevel@tonic-gate if (dns->res && dns->free_res) 154*0Sstevel@tonic-gate (*dns->free_res)(dns->res); 155*0Sstevel@tonic-gate if (dns->hes_ctx) 156*0Sstevel@tonic-gate hesiod_end(dns->hes_ctx); 157*0Sstevel@tonic-gate memput(dns, sizeof *dns); 158*0Sstevel@tonic-gate memput(this, sizeof *this); 159*0Sstevel@tonic-gate } 160*0Sstevel@tonic-gate 161