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 * Copyright 2014 Nexenta Systems, Inc. All rights reserved. 28 */ 29 30 #include <sys/types.h> 31 #include <netinet/in.h> 32 #include <arpa/nameser.h> 33 #include <resolv.h> 34 #include <netdb.h> 35 #include <limits.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 #include <ctype.h> 40 41 /* 42 * Private resolver of target and type with arguments: 43 * klooukp [ target [ RR_type ] ] 44 * 45 * Utitilizes DNS lookups to discover domain and realm information. This CLI 46 * is used primarily by kdcmgr(1M) and kclient(1M). 47 */ 48 49 int 50 /* ARGSUSED */ 51 main(int argc, char **argv) 52 { 53 unsigned char answer[NS_MAXMSG], *ansp = NULL, *end, a, b, c, d; 54 int len = 0, anslen, hostlen, nq, na, type, class; 55 int ttl __unused, priority __unused, weight __unused, port, size; 56 char name[NS_MAXDNAME], *cp, *typestr = NULL; 57 char nbuf[INET6_ADDRSTRLEN]; 58 struct __res_state stat; 59 int found = 0; 60 int rr_type = T_A; 61 HEADER *h; 62 63 if (argc > 3) 64 exit(1); 65 66 if (argc == 1) { 67 if (gethostname(name, MAXHOSTNAMELEN) != 0) 68 exit(1); 69 } else { 70 (void) strncpy(name, (char *)argv[1], NS_MAXDNAME); 71 if (argc == 3) { 72 typestr = argv[2]; 73 74 switch (*typestr) { 75 case 'A': 76 rr_type = T_A; 77 break; 78 case 'C': 79 rr_type = T_CNAME; 80 break; 81 case 'I': 82 rr_type = T_A; 83 break; 84 case 'P': 85 rr_type = T_PTR; 86 (void) sscanf(name, "%hhd.%hhd.%hhd.%hhd", 87 &a, &b, &c, &d); 88 (void) sprintf(name, "%d.%d.%d.%d.in-addr.arpa", 89 d, c, b, a); 90 break; 91 case 'S': 92 rr_type = T_SRV; 93 break; 94 default: 95 exit(1); 96 } 97 } 98 } 99 100 (void) memset(&stat, 0, sizeof (stat)); 101 102 if (res_ninit(&stat) == -1) 103 exit(1); 104 105 anslen = sizeof (answer); 106 len = res_nsearch(&stat, name, C_IN, rr_type, answer, anslen); 107 108 if (len < sizeof (HEADER)) { 109 res_ndestroy(&stat); 110 exit(1); 111 } 112 113 ansp = answer; 114 end = ansp + anslen; 115 116 /* LINTED */ 117 h = (HEADER *)answer; 118 nq = ntohs(h->qdcount); 119 na = ntohs(h->ancount); 120 ansp += HFIXEDSZ; 121 122 if (nq != 1 || na < 1) { 123 res_ndestroy(&stat); 124 exit(1); 125 } 126 127 hostlen = sizeof (name); 128 len = dn_expand(answer, end, ansp, name, hostlen); 129 if (len < 0) { 130 res_ndestroy(&stat); 131 exit(1); 132 } 133 134 ansp += len + QFIXEDSZ; 135 136 if (ansp > end) { 137 res_ndestroy(&stat); 138 exit(1); 139 } 140 141 while (na-- > 0 && ansp < end) { 142 143 len = dn_expand(answer, end, ansp, name, hostlen); 144 145 if (len < 0) 146 continue; 147 ansp += len; /* name */ 148 NS_GET16(type, ansp); /* type */ 149 NS_GET16(class, ansp); /* class */ 150 NS_GET32(ttl, ansp); /* ttl */ 151 NS_GET16(size, ansp); /* size */ 152 153 if ((ansp + size) > end) { 154 res_ndestroy(&stat); 155 exit(1); 156 } 157 if (type == T_SRV) { 158 NS_GET16(priority, ansp); 159 NS_GET16(weight, ansp); 160 NS_GET16(port, ansp); 161 len = dn_expand(answer, end, ansp, name, hostlen); 162 if (len < 0) { 163 res_ndestroy(&stat); 164 exit(1); 165 } 166 for (cp = name; *cp; cp++) { 167 *cp = tolower(*cp); 168 } 169 (void) printf("%s %d\n", name, port); 170 } else if (typestr && *typestr == 'I') { 171 (void) inet_ntop(AF_INET, (void *)ansp, nbuf, 172 INET6_ADDRSTRLEN); 173 len = size; 174 (void) printf("%s\n", nbuf); 175 } else if (type == T_PTR) { 176 len = dn_expand(answer, end, ansp, name, hostlen); 177 if (len < 0) { 178 res_ndestroy(&stat); 179 exit(1); 180 } 181 } 182 ansp += len; 183 if (type == rr_type && class == C_IN) { 184 found = 1; 185 if (type != T_SRV && !(typestr && *typestr == 'I')) 186 break; 187 } 188 } 189 190 if (found != 1) { 191 res_ndestroy(&stat); 192 exit(1); 193 } 194 195 for (cp = name; *cp; cp++) { 196 *cp = tolower(*cp); 197 } 198 199 if (type != T_SRV && !(typestr && *typestr == 'I')) 200 (void) printf("%s\n", name); 201 202 res_ndestroy(&stat); 203 204 return (0); 205 } 206