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 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <netinet/in.h> 31 #include <arpa/nameser.h> 32 #include <resolv.h> 33 #include <netdb.h> 34 #include <limits.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 #include <ctype.h> 39 40 /* 41 * Private resolver of target and type with arguments: 42 * klooukp [ target [ RR_type ] ] 43 * 44 * Utitilizes DNS lookups to discover domain and realm information. This CLI 45 * is used primarily by kdcmgr(1M) and kclient(1M). 46 */ 47 48 int 49 /* ARGSUSED */ 50 main(int argc, char **argv) 51 { 52 unsigned char answer[NS_MAXMSG], *ansp = NULL, *end, a, b, c, d; 53 int len = 0, anslen, hostlen, nq, na, type, class; 54 int ttl, priority, weight, port, size; 55 char name[NS_MAXDNAME], *cp, *typestr = NULL; 56 char nbuf[INET6_ADDRSTRLEN]; 57 struct __res_state stat; 58 int found = 0; 59 int rr_type = T_A; 60 HEADER *h; 61 62 if (argc > 3) 63 exit(1); 64 65 if (argc == 1) { 66 if (gethostname(name, MAXHOSTNAMELEN) != 0) 67 exit(1); 68 } else { 69 (void) strncpy(name, (char *)argv[1], NS_MAXDNAME); 70 if (argc == 3) { 71 typestr = argv[2]; 72 73 switch (*typestr) { 74 case 'A': 75 rr_type = T_A; 76 break; 77 case 'C': 78 rr_type = T_CNAME; 79 break; 80 case 'I': 81 rr_type = T_A; 82 break; 83 case 'P': 84 rr_type = T_PTR; 85 (void) sscanf(name, "%d.%d.%d.%d", 86 &a, &b, &c, &d); 87 (void) sprintf(name, "%d.%d.%d.%d.in-addr.arpa", 88 d, c, b, a); 89 break; 90 case 'S': 91 rr_type = T_SRV; 92 break; 93 default: 94 exit(1); 95 } 96 } 97 } 98 99 (void) memset(&stat, 0, sizeof (stat)); 100 101 if (res_ninit(&stat) == -1) 102 exit(1); 103 104 anslen = sizeof (answer); 105 len = res_nsearch(&stat, name, C_IN, rr_type, answer, anslen); 106 107 if (len < sizeof (HEADER)) { 108 res_ndestroy(&stat); 109 exit(1); 110 } 111 112 ansp = answer; 113 end = ansp + anslen; 114 115 /* LINTED */ 116 h = (HEADER *)answer; 117 nq = ntohs(h->qdcount); 118 na = ntohs(h->ancount); 119 ansp += HFIXEDSZ; 120 121 if (nq != 1 || na < 1) { 122 res_ndestroy(&stat); 123 exit(1); 124 } 125 126 hostlen = sizeof (name); 127 len = dn_expand(answer, end, ansp, name, hostlen); 128 if (len < 0) { 129 res_ndestroy(&stat); 130 exit(1); 131 } 132 133 ansp += len + QFIXEDSZ; 134 135 if (ansp > end) { 136 res_ndestroy(&stat); 137 exit(1); 138 } 139 140 while (na-- > 0 && ansp < end) { 141 142 len = dn_expand(answer, end, ansp, name, hostlen); 143 144 if (len < 0) 145 continue; 146 ansp += len; /* name */ 147 NS_GET16(type, ansp); /* type */ 148 NS_GET16(class, ansp); /* class */ 149 NS_GET32(ttl, ansp); /* ttl */ 150 NS_GET16(size, ansp); /* size */ 151 152 if ((ansp + size) > end) { 153 res_ndestroy(&stat); 154 exit(1); 155 } 156 if (type == T_SRV) { 157 NS_GET16(priority, ansp); 158 NS_GET16(weight, ansp); 159 NS_GET16(port, ansp); 160 len = dn_expand(answer, end, ansp, name, hostlen); 161 if (len < 0) { 162 res_ndestroy(&stat); 163 exit(1); 164 } 165 for (cp = name; *cp; cp++) { 166 *cp = tolower(*cp); 167 } 168 (void) printf("%s %d\n", name, port); 169 } else if (typestr && *typestr == 'I') { 170 (void) inet_ntop(AF_INET, (void *)ansp, nbuf, 171 INET6_ADDRSTRLEN); 172 len = size; 173 (void) printf("%s\n", nbuf); 174 } else if (type == T_PTR) { 175 len = dn_expand(answer, end, ansp, name, hostlen); 176 if (len < 0) { 177 res_ndestroy(&stat); 178 exit(1); 179 } 180 } 181 ansp += len; 182 if (type == rr_type && class == C_IN) { 183 found = 1; 184 if (type != T_SRV && !(typestr && *typestr == 'I')) 185 break; 186 } 187 } 188 189 if (found != 1) { 190 res_ndestroy(&stat); 191 exit(1); 192 } 193 194 for (cp = name; *cp; cp++) { 195 *cp = tolower(*cp); 196 } 197 198 if (type != T_SRV && !(typestr && *typestr == 'I')) 199 (void) printf("%s\n", name); 200 201 res_ndestroy(&stat); 202 203 return (0); 204 } 205