1 resolv.h |
1 /*- |
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2 * Copyright (c) 1983, 1987, 1989, 1993 |
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3 * The Regents of the University of California. All rights reserved. |
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4 * |
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5 * Redistribution and use in source and binary forms, with or without |
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6 * modification, are permitted provided that the following conditions |
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7 * are met: |
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8 * 1. Redistributions of source code must retain the above copyright |
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9 * notice, this list of conditions and the following disclaimer. |
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10 * 2. Redistributions in binary form must reproduce the above copyright |
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11 * notice, this list of conditions and the following disclaimer in the |
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12 * documentation and/or other materials provided with the distribution. |
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13 * 4. Neither the name of the University nor the names of its contributors |
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14 * may be used to endorse or promote products derived from this software |
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15 * without specific prior written permission. |
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16 * |
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17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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27 * SUCH DAMAGE. |
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28 */ |
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29 |
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30 /* |
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31 * Portions Copyright (c) 1996 by Internet Software Consortium. |
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32 * |
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33 * Permission to use, copy, modify, and distribute this software for any |
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34 * purpose with or without fee is hereby granted, provided that the above |
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35 * copyright notice and this permission notice appear in all copies. |
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36 * |
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37 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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38 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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39 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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40 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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41 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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42 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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43 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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44 * SOFTWARE. |
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45 * © Portions copyright (c) 2007 Symbian Software Ltd. All rights reserved. |
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46 */ |
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47 |
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48 /* |
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49 * @(#)resolv.h 8.1 (Berkeley) 6/2/93 |
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50 * From Id: resolv.h,v 8.12 1998/04/28 19:36:46 halley Exp $ |
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51 * $FreeBSD: src/include/resolv.h,v 1.26 2004/09/09 17:39:47 yar Exp $ |
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52 */ |
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53 |
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54 #ifndef _RESOLV_H_ |
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55 #define _RESOLV_H_ |
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56 |
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57 #include <sys/param.h> |
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58 #include <sys/types.h> |
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59 #include <sys/cdefs.h> |
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60 #include <sys/socket.h> |
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61 #include <stdio.h> |
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62 |
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63 /* |
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64 * Revision information. This is the release date in YYYYMMDD format. |
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65 * It can change every day so the right thing to do with it is use it |
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66 * in preprocessor commands such as "#if (__RES > 19931104)". Do not |
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67 * compare for equality; rather, use it to determine whether your resolver |
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68 * is new enough to contain a certain feature. |
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69 */ |
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70 |
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71 #define __RES 19960801 |
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72 |
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73 /* |
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74 * Resolver configuration file. |
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75 * Normally not present, but may contain the address of the |
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76 * inital name server(s) to query and the domain search list. |
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77 */ |
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78 |
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79 #ifndef _PATH_RESCONF |
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80 #define _PATH_RESCONF "/etc/resolv.conf" |
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81 #endif |
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82 |
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83 /* |
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84 * Global defines and variables for resolver stub. |
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85 */ |
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86 #define MAXNS 3 /* max # name servers we'll track */ |
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87 #define MAXDFLSRCH 3 /* # default domain levels to try */ |
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88 #define MAXDNSRCH 6 /* max # domains in search path */ |
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89 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */ |
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90 |
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91 #define RES_TIMEOUT 5 /* min. seconds between retries */ |
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92 #define RES_DFLRETRY 4 /* retries per each name server */ |
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93 #define MAXRESOLVSORT 10 /* number of net to sort on */ |
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94 #define RES_MAXNDOTS 15 /* should reflect bit field size */ |
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95 #define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */ |
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96 #define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */ |
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97 |
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98 struct __res_state { |
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99 int retrans; /* retransmition time interval */ |
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100 int retry; /* number of times to retransmit */ |
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101 u_long options; /* option flags - see below. */ |
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102 int nscount; /* number of name servers */ |
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103 struct sockaddr_in |
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104 nsaddr_list[MAXNS]; /* address of name server */ |
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105 #define nsaddr nsaddr_list[0] /* for backward compatibility */ |
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106 u_short id; /* current message id */ |
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107 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ |
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108 char defdname[256]; /* default domain (deprecated) */ |
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109 u_long pfcode; /* RES_PRF_ flags - see below. */ |
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110 unsigned ndots:4; /* threshold for initial abs. query */ |
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111 unsigned nsort:4; /* number of elements in sort_list[] */ |
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112 char unused[3]; |
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113 struct { |
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114 struct in_addr addr; |
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115 u_int32_t mask; |
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116 } sort_list[MAXRESOLVSORT]; |
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117 char pad[72]; /* on an i386 this means 512b total */ |
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118 }; |
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119 |
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120 /* for INET6 */ |
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121 /* |
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122 * replacement of __res_state, separated to keep binary compatibility. |
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123 */ |
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124 struct __res_state_ext { |
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125 struct sockaddr_storage nsaddr_list[MAXNS]; |
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126 struct { |
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127 int af; /* address family for addr, mask */ |
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128 union { |
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129 struct in_addr ina; |
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130 struct in6_addr in6a; |
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131 } addr, mask; |
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132 } sort_list[MAXRESOLVSORT]; |
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133 }; |
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134 |
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135 /* |
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136 * Resolver options (keep these in synch with res_debug.c, please) |
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137 */ |
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138 #define RES_INIT 0x00000001 /* address initialized */ |
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139 #define RES_DEBUG 0x00000002 /* print debug messages */ |
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140 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/ |
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141 #define RES_USEVC 0x00000008 /* use virtual circuit */ |
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142 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */ |
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143 #define RES_IGNTC 0x00000020 /* ignore truncation errors */ |
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144 #define RES_RECURSE 0x00000040 /* recursion desired */ |
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145 #define RES_DEFNAMES 0x00000080 /* use default domain name */ |
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146 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ |
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147 #define RES_DNSRCH 0x00000200 /* search up local domain tree */ |
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148 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */ |
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149 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */ |
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150 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */ |
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151 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ |
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152 #define RES_NOTLDQUERY 0x00004000 /* Don't query TLD names */ |
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153 /* KAME extensions: use higher bit to avoid conflict with ISC use */ |
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154 #define RES_USE_EDNS0 0x40000000 /* use EDNS0 */ |
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155 |
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156 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH) |
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157 |
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158 /* |
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159 * Resolver "pfcode" values. Used by dig. |
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160 */ |
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161 #define RES_PRF_STATS 0x00000001 |
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162 #define RES_PRF_UPDATE 0x00000002 |
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163 #define RES_PRF_CLASS 0x00000004 |
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164 #define RES_PRF_CMD 0x00000008 |
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165 #define RES_PRF_QUES 0x00000010 |
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166 #define RES_PRF_ANS 0x00000020 |
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167 #define RES_PRF_AUTH 0x00000040 |
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168 #define RES_PRF_ADD 0x00000080 |
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169 #define RES_PRF_HEAD1 0x00000100 |
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170 #define RES_PRF_HEAD2 0x00000200 |
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171 #define RES_PRF_TTLID 0x00000400 |
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172 #define RES_PRF_HEADX 0x00000800 |
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173 #define RES_PRF_QUERY 0x00001000 |
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174 #define RES_PRF_REPLY 0x00002000 |
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175 #define RES_PRF_INIT 0x00004000 |
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176 /* 0x00008000 */ |
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177 |
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178 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } |
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179 res_sendhookact; |
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180 |
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181 typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *ns, |
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182 const u_char **query, |
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183 int *querylen, |
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184 u_char *ans, |
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185 int anssiz, |
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186 int *resplen); |
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187 |
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188 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *ns, |
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189 const u_char *query, |
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190 int querylen, |
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191 u_char *ans, |
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192 int anssiz, |
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193 int *resplen); |
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194 |
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195 struct res_sym { |
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196 int number; /* Identifying number, like T_MX */ |
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197 char * name; /* Its symbolic name, like "MX" */ |
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198 char * humanname; /* Its fun name, like "mail exchanger" */ |
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199 }; |
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200 |
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201 __BEGIN_DECLS |
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202 extern struct __res_state *___res(void); |
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203 extern struct __res_state_ext *___res_ext(void); |
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204 __END_DECLS |
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205 #define _res (*___res()) |
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206 #define _res_ext (*___res_ext()) |
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207 /* for INET6 */ |
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208 extern struct __res_state_ext _res_ext; |
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209 |
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210 extern const struct res_sym __p_class_syms[]; |
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211 extern const struct res_sym __p_type_syms[]; |
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212 |
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213 /* Private routines shared between libc/net, named, nslookup and others. */ |
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214 #define res_hnok __res_hnok |
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215 #define res_ownok __res_ownok |
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216 #define res_mailok __res_mailok |
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217 #define res_dnok __res_dnok |
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218 #define sym_ston __sym_ston |
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219 #define sym_ntos __sym_ntos |
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220 #define sym_ntop __sym_ntop |
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221 #define b64_ntop __b64_ntop |
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222 #define b64_pton __b64_pton |
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223 #define loc_ntoa __loc_ntoa |
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224 #define loc_aton __loc_aton |
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225 #define fp_resstat __fp_resstat |
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226 #define p_query __p_query |
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227 #define dn_skipname __dn_skipname |
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228 #define fp_resstat __fp_resstat |
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229 #define fp_query __fp_query |
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230 #define fp_nquery __fp_nquery |
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231 #define hostalias __hostalias |
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232 #define putlong __putlong |
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233 #define putshort __putshort |
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234 #define p_class __p_class |
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235 #define p_time __p_time |
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236 #define p_type __p_type |
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237 #define p_query __p_query |
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238 #define p_cdnname __p_cdnname |
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239 #define p_section __p_section |
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240 #define p_cdname __p_cdname |
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241 #define p_fqnname __p_fqnname |
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242 #define p_fqname __p_fqname |
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243 #define p_option __p_option |
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244 #define p_secstodate __p_secstodate |
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245 #define dn_count_labels __dn_count_labels |
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246 #define dn_comp __dn_comp |
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247 #define dn_expand __dn_expand |
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248 #define res_init __res_init |
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249 #define res_randomid __res_randomid |
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250 #define res_query __res_query |
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251 #define res_search __res_search |
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252 #define res_querydomain __res_querydomain |
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253 #define res_mkquery __res_mkquery |
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254 #define res_send __res_send |
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255 #define res_isourserver __res_isourserver |
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256 #define res_nameinquery __res_nameinquery |
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257 #define res_queriesmatch __res_queriesmatch |
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258 #define res_close __res_close |
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259 #define res_opt __res_opt |
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260 #define res_mkupdate __res_mkupdate |
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261 #define res_mkupdrec __res_mkupdrec |
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262 #define res_freeupdrec __res_freeupdrec |
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263 |
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264 |
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265 #endif /* !_RESOLV_H_ */ |