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 | * 3. All advertising materials mentioning features or use of this software |
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14 | * must display the following acknowledgement: |
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15 | * This product includes software developed by the University of |
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16 | * California, Berkeley and its contributors. |
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17 | * 4. Neither the name of the University nor the names of its contributors |
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18 | * may be used to endorse or promote products derived from this software |
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19 | * without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 | * SUCH DAMAGE. |
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32 | */ |
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33 | |
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34 | /* |
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35 | * Portions Copyright (c) 1996 by Internet Software Consortium. |
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36 | * |
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37 | * Permission to use, copy, modify, and distribute this software for any |
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38 | * purpose with or without fee is hereby granted, provided that the above |
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39 | * copyright notice and this permission notice appear in all copies. |
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40 | * |
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41 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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42 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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43 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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44 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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45 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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46 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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47 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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48 | * SOFTWARE. |
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49 | */ |
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50 | |
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51 | /* |
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52 | * @(#)resolv.h 8.1 (Berkeley) 6/2/93 |
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53 | * From Id: resolv.h,v 8.12 1998/04/28 19:36:46 halley Exp $ |
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54 | * $FreeBSD: src/include/resolv.h,v 1.21 2002/03/23 17:24:53 imp Exp $ |
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55 | */ |
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56 | |
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57 | #ifndef _RESOLV_H_ |
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58 | #define _RESOLV_H_ |
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59 | |
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60 | #include <sys/param.h> |
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61 | #include <sys/types.h> |
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62 | #include <sys/cdefs.h> |
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63 | #include <sys/socket.h> |
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64 | #include <stdio.h> |
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65 | |
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66 | /* |
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67 | * Revision information. This is the release date in YYYYMMDD format. |
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68 | * It can change every day so the right thing to do with it is use it |
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69 | * in preprocessor commands such as "#if (__RES > 19931104)". Do not |
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70 | * compare for equality; rather, use it to determine whether your resolver |
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71 | * is new enough to contain a certain feature. |
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72 | */ |
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73 | |
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74 | #define __RES 19960801 |
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75 | |
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76 | /* |
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77 | * Resolver configuration file. |
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78 | * Normally not present, but may contain the address of the |
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79 | * inital name server(s) to query and the domain search list. |
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80 | */ |
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81 | |
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82 | #ifndef _PATH_RESCONF |
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83 | #define _PATH_RESCONF "/etc/resolv.conf" |
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84 | #endif |
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85 | |
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86 | /* |
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87 | * Global defines and variables for resolver stub. |
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88 | */ |
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89 | #define MAXNS 3 /* max # name servers we'll track */ |
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90 | #define MAXDFLSRCH 3 /* # default domain levels to try */ |
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91 | #define MAXDNSRCH 6 /* max # domains in search path */ |
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92 | #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */ |
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93 | |
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94 | #define RES_TIMEOUT 5 /* min. seconds between retries */ |
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95 | #define MAXRESOLVSORT 10 /* number of net to sort on */ |
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96 | #define RES_MAXNDOTS 15 /* should reflect bit field size */ |
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97 | #define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */ |
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98 | #define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */ |
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99 | #define RES_DFLRETRY 2 /* Default #/tries. */ |
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100 | #define RES_MAXTIME 65535 /* Infinity, in milliseconds. */ |
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101 | |
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102 | |
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103 | typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } |
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104 | res_sendhookact; |
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105 | typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *ns, const u_char **query, |
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106 | int *querylen, |
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107 | u_char *ans, |
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108 | int anssiz, |
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109 | int *resplen); |
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110 | |
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111 | typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns, |
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112 | const u_char *query, |
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113 | int querylen, |
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114 | u_char *ans, |
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115 | int anssiz, |
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116 | int *resplen); |
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117 | |
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118 | |
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119 | struct __res_state { |
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120 | int retrans; /* retransmition time interval */ |
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121 | int retry; /* number of times to retransmit */ |
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122 | u_long options; /* option flags - see below. */ |
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123 | int nscount; /* number of name servers */ |
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124 | struct sockaddr_in |
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125 | nsaddr_list[MAXNS]; /* address of name server */ |
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126 | #define nsaddr nsaddr_list[0] /* for backward compatibility */ |
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127 | u_short id; /* current message id */ |
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128 | char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ |
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129 | char defdname[256]; /* default domain (deprecated) */ |
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130 | u_long pfcode; /* RES_PRF_ flags - see below. */ |
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131 | unsigned ndots:4; /* threshold for initial abs. query */ |
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132 | unsigned nsort:4; /* number of elements in sort_list[] */ |
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133 | char unused[3]; |
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134 | struct { |
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135 | struct in_addr addr; |
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136 | u_int32_t mask; |
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137 | } sort_list[MAXRESOLVSORT]; |
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138 | res_send_qhook qhook; /* query hook */ |
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139 | res_send_rhook rhook; /* response hook */ |
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140 | int res_h_errno; /* last one set for this context */ |
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141 | int _vcsock; /* PRIVATE: for res_send VC i/o */ |
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142 | u_int _flags; /* PRIVATE: see below */ |
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143 | union { |
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144 | char pad[52]; /* On an i386 this means 512b total. */ |
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145 | struct { |
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146 | u_int16_t nscount; |
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147 | u_int16_t nsmap[MAXNS]; |
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148 | int nssocks[MAXNS]; |
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149 | u_int16_t nscount6; |
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150 | u_int16_t nsinit; |
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151 | struct sockaddr_in6 *nsaddrs[MAXNS]; |
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152 | unsigned long long int initstamp |
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153 | __attribute__((__packed__)); |
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154 | #if 0 |
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155 | unsigned int _initstamp[2]; |
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156 | #endif |
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157 | } _ext; |
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158 | } _u; |
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159 | }; |
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160 | |
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161 | typedef struct __res_state *res_state; |
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162 | |
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163 | /* for INET6 */ |
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164 | /* |
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165 | * replacement of __res_state, separated to keep binary compatibility. |
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166 | */ |
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167 | struct __res_state_ext { |
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168 | struct sockaddr_storage nsaddr_list[MAXNS]; |
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169 | struct { |
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170 | int af; /* address family for addr, mask */ |
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171 | union { |
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172 | struct in_addr ina; |
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173 | struct in6_addr in6a; |
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174 | } addr, mask; |
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175 | } sort_list[MAXRESOLVSORT]; |
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176 | }; |
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177 | |
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178 | /* |
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179 | * * Resolver flags (used to be discrete per-module statics ints). |
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180 | * */ |
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181 | #define RES_F_VC 0x00000001 /* socket is TCP */ |
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182 | #define RES_F_CONN 0x00000002 /* socket is connected */ |
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183 | |
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184 | /* res_findzonecut() options */ |
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185 | #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */ |
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186 | |
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187 | /* |
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188 | * Resolver options (keep these in synch with res_debug.c, please) |
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189 | */ |
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190 | #define RES_INIT 0x00000001 /* address initialized */ |
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191 | #define RES_DEBUG 0x00000002 /* print debug messages */ |
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192 | #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/ |
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193 | #define RES_USEVC 0x00000008 /* use virtual circuit */ |
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194 | #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */ |
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195 | #define RES_IGNTC 0x00000020 /* ignore truncation errors */ |
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196 | #define RES_RECURSE 0x00000040 /* recursion desired */ |
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197 | #define RES_DEFNAMES 0x00000080 /* use default domain name */ |
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198 | #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ |
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199 | #define RES_DNSRCH 0x00000200 /* search up local domain tree */ |
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200 | #define RES_INSECURE1 0x00000400 /* type 1 security disabled */ |
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201 | #define RES_INSECURE2 0x00000800 /* type 2 security disabled */ |
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202 | #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */ |
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203 | #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ |
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204 | #define RES_ROTATE 0x00004000 /* rotate ns list after each query */ |
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205 | #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */ |
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206 | #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */ |
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207 | #define RES_BLAST 0x00020000 /* blast all recursive servers */ |
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208 | #define RES_USEBSTRING 0x00040000 /* IPv6 reverse lookup with byte |
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209 | strings */ |
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210 | #define RES_NOIP6DOTINT 0x00080000 /* Do not use .ip6.int in IPv6 |
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211 | reverse lookup */ |
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212 | |
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213 | #define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT) |
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214 | |
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215 | /* |
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216 | * Resolver "pfcode" values. Used by dig. |
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217 | */ |
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218 | #define RES_PRF_STATS 0x00000001 |
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219 | #define RES_PRF_UPDATE 0x00000002 |
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220 | #define RES_PRF_CLASS 0x00000004 |
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221 | #define RES_PRF_CMD 0x00000008 |
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222 | #define RES_PRF_QUES 0x00000010 |
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223 | #define RES_PRF_ANS 0x00000020 |
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224 | #define RES_PRF_AUTH 0x00000040 |
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225 | #define RES_PRF_ADD 0x00000080 |
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226 | #define RES_PRF_HEAD1 0x00000100 |
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227 | #define RES_PRF_HEAD2 0x00000200 |
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228 | #define RES_PRF_TTLID 0x00000400 |
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229 | #define RES_PRF_HEADX 0x00000800 |
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230 | #define RES_PRF_QUERY 0x00001000 |
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231 | #define RES_PRF_REPLY 0x00002000 |
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232 | #define RES_PRF_INIT 0x00004000 |
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233 | /* 0x00008000 */ |
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234 | |
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235 | #define RES_SET_H_ERRNO(r,x) \ |
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236 | do \ |
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237 | { \ |
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238 | (r)->res_h_errno = x; \ |
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239 | h_errno = (x); \ |
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240 | } \ |
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241 | while (0) |
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242 | |
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243 | struct res_sym { |
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244 | int number; /* Identifying number, like T_MX */ |
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245 | char * name; /* Its symbolic name, like "MX" */ |
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246 | char * humanname; /* Its fun name, like "mail exchanger" */ |
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247 | }; |
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248 | |
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249 | extern struct __res_state _res; |
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250 | /* for INET6 */ |
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251 | extern struct __res_state_ext _res_ext; |
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252 | |
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253 | extern const struct res_sym __p_class_syms[]; |
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254 | extern const struct res_sym __p_type_syms[]; |
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255 | |
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256 | /* Private routines shared between libc/net, named, nslookup and others. */ |
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257 | #define res_hnok __res_hnok |
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258 | #define res_hostalias __res_hostalias |
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259 | #define res_ownok __res_ownok |
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260 | #define res_mailok __res_mailok |
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261 | #define res_dnok __res_dnok |
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262 | #define sym_ston __sym_ston |
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263 | #define sym_ntos __sym_ntos |
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264 | #define sym_ntop __sym_ntop |
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265 | #define b64_ntop __b64_ntop |
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266 | #define b64_pton __b64_pton |
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267 | #define loc_ntoa __loc_ntoa |
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268 | #define loc_aton __loc_aton |
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269 | #define fp_resstat __fp_resstat |
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270 | #define p_query __p_query |
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271 | #define dn_skipname __dn_skipname |
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272 | #define fp_resstat __fp_resstat |
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273 | #define fp_query __fp_query |
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274 | #define fp_nquery __fp_nquery |
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275 | #define hostalias __hostalias |
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276 | #define putlong __putlong |
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277 | #define putshort __putshort |
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278 | #define p_class __p_class |
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279 | #define p_rcode __p_rcode |
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280 | #define p_time __p_time |
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281 | #define p_type __p_type |
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282 | #define p_query __p_query |
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283 | #define p_cdnname __p_cdnname |
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284 | #define p_section __p_section |
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285 | #define p_cdname __p_cdname |
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286 | #define p_fqnname __p_fqnname |
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287 | #define p_fqname __p_fqname |
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288 | #define p_option __p_option |
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289 | #define p_secstodate __p_secstodate |
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290 | #define dn_count_labels __dn_count_labels |
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291 | #define dn_comp __dn_comp |
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292 | #define dn_expand __dn_expand |
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293 | #define res_init __res_init |
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294 | #define res_randomid __res_randomid |
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295 | #define res_query __res_query |
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296 | #define res_search __res_search |
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297 | #define res_querydomain __res_querydomain |
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298 | #define res_mkquery __res_mkquery |
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299 | #define res_send __res_send |
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300 | #define res_isourserver __res_isourserver |
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301 | #define res_nameinquery __res_nameinquery |
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302 | #define res_nclose __res_nclose |
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303 | #define res_ninit __res_ninit |
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304 | #define res_nmkquery __res_nmkquery |
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305 | #define res_npquery __res_npquery |
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306 | #define res_nquery __res_nquery |
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307 | #define res_nquerydomain __res_nquerydomain |
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308 | #define res_nsearch __res_nsearch |
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309 | #define res_nsend __res_nsend |
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310 | #define res_nisourserver __res_nisourserver |
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311 | #define res_queriesmatch __res_queriesmatch |
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312 | #define res_close __res_close |
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313 | #define res_opt __res_opt |
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314 | #define res_mkupdate __res_mkupdate |
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315 | #define res_mkupdrec __res_mkupdrec |
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316 | #define res_freeupdrec __res_freeupdrec |
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317 | |
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318 | __BEGIN_DECLS |
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319 | int res_hnok(const char *); |
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320 | int res_ownok(const char *); |
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321 | int res_mailok(const char *); |
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322 | int res_dnok(const char *); |
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323 | int sym_ston(const struct res_sym *, const char *, int *); |
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324 | const char * sym_ntos(const struct res_sym *, int, int *); |
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325 | const char * sym_ntop(const struct res_sym *, int, int *); |
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326 | int b64_ntop(u_char const *, size_t, char *, size_t); |
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327 | int b64_pton(char const *, u_char *, size_t); |
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328 | int loc_aton(const char *, u_char *); |
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329 | const char * loc_ntoa(const u_char *, char *); |
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330 | int dn_skipname(const u_char *, const u_char *); |
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331 | void fp_resstat(struct __res_state *, FILE *); |
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332 | void fp_query(const u_char *, FILE *); |
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333 | void fp_nquery(const u_char *, int, FILE *); |
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334 | const char * hostalias(const char *); |
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335 | void putlong(u_int32_t, u_char *); |
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336 | void putshort(u_int16_t, u_char *); |
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337 | const char * p_class(int); |
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338 | const char * p_rcode (int); |
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339 | const char * p_time(u_int32_t); |
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340 | const char * p_type(int); |
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341 | void p_query(const u_char *); |
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342 | const u_char * p_cdnname(const u_char *, const u_char *, int, FILE *); |
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343 | const u_char * p_cdname(const u_char *, const u_char *, FILE *); |
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344 | const u_char * p_fqnname(const u_char *, const u_char *, |
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345 | int, char *, int); |
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346 | const u_char * p_fqname(const u_char *, const u_char *, FILE *); |
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347 | const char * p_option(u_long); |
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348 | char * p_secstodate(u_long); |
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349 | int dn_count_labels(const char *); |
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350 | int dn_comp(const char *, u_char *, int, u_char **, u_char **); |
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351 | int dn_expand(const u_char *, const u_char *, const u_char *, |
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352 | char *, int); |
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353 | int res_init(void); |
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354 | u_int res_randomid(void); |
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355 | int res_query(const char *, int, int, u_char *, int); |
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356 | int res_search(const char *, int, int, u_char *, int); |
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357 | int res_querydomain(const char *, const char *, int, int, |
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358 | u_char *, int); |
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359 | int res_mkquery(int, const char *, int, int, const u_char *, |
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360 | int, const u_char *, u_char *, int); |
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361 | int res_send(const u_char *, int, u_char *, int); |
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362 | int res_isourserver(const struct sockaddr_in *); |
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363 | int res_nameinquery(const char *, int, int, |
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364 | const u_char *, const u_char *); |
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365 | void res_npquery (const res_state, const u_char *, int, FILE *); |
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366 | const char * res_hostalias (const res_state, const char *, char *, size_t); |
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367 | int res_nquery (res_state, const char *, int, int, u_char *, int); |
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368 | int res_nsearch (res_state, const char *, int, int, u_char *, int); |
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369 | int res_nquerydomain (res_state, const char *, const char *, int, |
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370 | int, u_char *, int); |
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371 | int res_nmkquery (res_state, int, const char *, int, int, |
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372 | const u_char *, int, const u_char *, u_char *, |
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373 | int); |
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374 | int res_nsend (res_state, const u_char *, int, u_char *, int); |
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375 | void res_nclose (res_state); |
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376 | |
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377 | int res_queriesmatch(const u_char *, const u_char *, |
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378 | const u_char *, const u_char *); |
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379 | void res_close(void); |
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380 | int res_opt(int, u_char *, int, int); |
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381 | const char * p_section(int, int); |
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382 | /* XXX The following depend on the ns_updrec typedef in arpa/nameser.h */ |
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383 | #ifdef _ARPA_NAMESER_H_ |
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384 | int res_update(ns_updrec *); |
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385 | int res_mkupdate(ns_updrec *, u_char *, int); |
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386 | ns_updrec * res_mkupdrec(int, const char *, u_int, u_int, u_long); |
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387 | void res_freeupdrec(ns_updrec *); |
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388 | #endif |
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389 | |
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390 | __END_DECLS |
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391 | |
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392 | #endif /* !_RESOLV_H_ */ |
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