1 /* $NetBSD: dns.h,v 1.1.1.2 2010/06/17 18:06:44 tron Exp $ */ 2 3 #ifndef _DNS_H_INCLUDED_ 4 #define _DNS_H_INCLUDED_ 5 6 /*++ 7 /* NAME 8 /* dns 3h 9 /* SUMMARY 10 /* domain name service lookup 11 /* SYNOPSIS 12 /* #include <dns.h> 13 /* DESCRIPTION 14 /* .nf 15 16 /* 17 * System library. 18 */ 19 #include <netinet/in.h> 20 #include <arpa/nameser.h> 21 #ifdef RESOLVE_H_NEEDS_STDIO_H 22 #include <stdio.h> 23 #endif 24 #ifdef RESOLVE_H_NEEDS_NAMESER8_COMPAT_H 25 #include <nameser8_compat.h> 26 #endif 27 #ifdef RESOLVE_H_NEEDS_ARPA_NAMESER_COMPAT_H 28 #include <arpa/nameser_compat.h> 29 #endif 30 #include <resolv.h> 31 32 /* 33 * Name server compatibility. These undocumented macros appear in the file 34 * <arpa/nameser.h>, but since they are undocumented we should not count on 35 * their presence, and so they are included here just in case. 36 */ 37 #ifndef GETSHORT 38 39 #define GETSHORT(s, cp) { \ 40 unsigned char *t_cp = (u_char *)(cp); \ 41 (s) = ((unsigned)t_cp[0] << 8) \ 42 | ((unsigned)t_cp[1]) \ 43 ; \ 44 (cp) += 2; \ 45 } 46 47 #define GETLONG(l, cp) { \ 48 unsigned char *t_cp = (u_char *)(cp); \ 49 (l) = ((unsigned)t_cp[0] << 24) \ 50 | ((unsigned)t_cp[1] << 16) \ 51 | ((unsigned)t_cp[2] << 8) \ 52 | ((unsigned)t_cp[3]) \ 53 ; \ 54 (cp) += 4; \ 55 } 56 57 #endif 58 59 /* 60 * SunOS 4 needs this. 61 */ 62 #ifndef T_TXT 63 #define T_TXT 16 64 #endif 65 66 /* 67 * Utility library. 68 */ 69 #include <vstring.h> 70 #include <sock_addr.h> 71 #include <myaddrinfo.h> 72 73 /* 74 * Structure for fixed resource record data. 75 */ 76 typedef struct DNS_FIXED { 77 unsigned short type; /* T_A, T_CNAME, etc. */ 78 unsigned short class; /* C_IN, etc. */ 79 unsigned int ttl; /* always */ 80 unsigned length; /* record length */ 81 } DNS_FIXED; 82 83 /* 84 * Structure of a DNS resource record after expansion. The components are 85 * named after the things one can expect to find in a DNS resource record. 86 */ 87 typedef struct DNS_RR { 88 char *qname; /* query name, mystrdup()ed */ 89 char *rname; /* reply name, mystrdup()ed */ 90 unsigned short type; /* T_A, T_CNAME, etc. */ 91 unsigned short class; /* C_IN, etc. */ 92 unsigned int ttl; /* always */ 93 unsigned short pref; /* T_MX only */ 94 struct DNS_RR *next; /* linkage */ 95 size_t data_len; /* actual data size */ 96 char data[1]; /* actually a bunch of data */ 97 } DNS_RR; 98 99 /* 100 * dns_strerror.c 101 */ 102 extern const char *dns_strerror(unsigned); 103 104 /* 105 * dns_strtype.c 106 */ 107 extern const char *dns_strtype(unsigned); 108 extern unsigned dns_type(const char *); 109 110 /* 111 * dns_rr.c 112 */ 113 extern DNS_RR *dns_rr_create(const char *, const char *, 114 ushort, ushort, 115 unsigned, unsigned, 116 const char *, size_t); 117 extern void dns_rr_free(DNS_RR *); 118 extern DNS_RR *dns_rr_copy(DNS_RR *); 119 extern DNS_RR *dns_rr_append(DNS_RR *, DNS_RR *); 120 extern DNS_RR *dns_rr_sort(DNS_RR *, int (*) (DNS_RR *, DNS_RR *)); 121 extern int dns_rr_compare_pref(DNS_RR *, DNS_RR *); 122 extern DNS_RR *dns_rr_shuffle(DNS_RR *); 123 extern DNS_RR *dns_rr_remove(DNS_RR *, DNS_RR *); 124 125 /* 126 * dns_rr_to_pa.c 127 */ 128 extern const char *dns_rr_to_pa(DNS_RR *, MAI_HOSTADDR_STR *); 129 130 /* 131 * dns_sa_to_rr.c 132 */ 133 extern DNS_RR *dns_sa_to_rr(const char *, unsigned, struct sockaddr *); 134 135 /* 136 * dns_rr_to_sa.c 137 */ 138 extern int dns_rr_to_sa(DNS_RR *, unsigned, struct sockaddr *, SOCKADDR_SIZE *); 139 140 /* 141 * dns_rr_eq_sa.c 142 */ 143 extern int dns_rr_eq_sa(DNS_RR *, struct sockaddr *); 144 145 #ifdef HAS_IPV6 146 #define DNS_RR_EQ_SA(rr, sa) \ 147 ((SOCK_ADDR_IN_FAMILY(sa) == AF_INET && (rr)->type == T_A \ 148 && SOCK_ADDR_IN_ADDR(sa).s_addr == IN_ADDR((rr)->data).s_addr) \ 149 || (SOCK_ADDR_IN_FAMILY(sa) == AF_INET6 && (rr)->type == T_AAAA \ 150 && memcmp((char *) &(SOCK_ADDR_IN6_ADDR(sa)), \ 151 (rr)->data, (rr)->data_len) == 0)) 152 #else 153 #define DNS_RR_EQ_SA(rr, sa) \ 154 (SOCK_ADDR_IN_FAMILY(sa) == AF_INET && (rr)->type == T_A \ 155 && SOCK_ADDR_IN_ADDR(sa).s_addr == IN_ADDR((rr)->data).s_addr) 156 #endif 157 158 /* 159 * dns_lookup.c 160 */ 161 extern int dns_lookup(const char *, unsigned, unsigned, DNS_RR **, 162 VSTRING *, VSTRING *); 163 extern int dns_lookup_l(const char *, unsigned, DNS_RR **, VSTRING *, 164 VSTRING *, int,...); 165 extern int dns_lookup_v(const char *, unsigned, DNS_RR **, VSTRING *, 166 VSTRING *, int, unsigned *); 167 168 /* 169 * Request flags. 170 */ 171 #define DNS_REQ_FLAG_STOP_OK (1<<0) 172 #define DNS_REQ_FLAG_STOP_INVAL (1<<1) 173 #define DNS_REQ_FLAG_NONE (0) 174 175 /* 176 * Status codes. Failures must have negative codes so they will not collide 177 * with valid counts of answer records etc. 178 */ 179 #define DNS_INVAL (-5) /* query ok, malformed reply */ 180 #define DNS_FAIL (-4) /* query failed, don't retry */ 181 #define DNS_NOTFOUND (-3) /* query ok, data not found */ 182 #define DNS_RETRY (-2) /* query failed, try again */ 183 #define DNS_RECURSE (-1) /* recursion needed */ 184 #define DNS_OK 0 /* query succeeded */ 185 186 /* 187 * How long can a DNS name or single text value be? 188 */ 189 #define DNS_NAME_LEN 1024 190 191 /* LICENSE 192 /* .ad 193 /* .fi 194 /* The Secure Mailer license must be distributed with this software. 195 /* AUTHOR(S) 196 /* Wietse Venema 197 /* IBM T.J. Watson Research 198 /* P.O. Box 704 199 /* Yorktown Heights, NY 10598, USA 200 /*--*/ 201 202 #endif 203