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annotate packages/net/ns/dns/current/include/dns_priv.h @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents 1f968b35cd30
children
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1 #ifndef CYGONCE_NS_DNS_DNS_PRIV_H
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2 #define CYGONCE_NS_DNS_DNS_PRIV_H
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3 //=============================================================================
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4 //
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5 // dns-priv.h
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6 //
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7 // Private DNS client definitions.
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8 //
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9 //=============================================================================
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10 // ####ECOSGPLCOPYRIGHTBEGIN####
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11 // -------------------------------------------
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12 // This file is part of eCos, the Embedded Configurable Operating System.
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13 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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14 //
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15 // eCos is free software; you can redistribute it and/or modify it under
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16 // the terms of the GNU General Public License as published by the Free
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17 // Software Foundation; either version 2 or (at your option) any later
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18 // version.
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19 //
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT
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21 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 // for more details.
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24 //
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25 // You should have received a copy of the GNU General Public License
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26 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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27 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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28 //
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29 // As a special exception, if other files instantiate templates or use
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30 // macros or inline functions from this file, or you compile this file
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31 // and link it with other works to produce a work based on this file,
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32 // this file does not by itself cause the resulting work to be covered by
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33 // the GNU General Public License. However the source code for this file
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34 // must still be made available in accordance with section (3) of the GNU
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35 // General Public License v2.
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36 //
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37 // This exception does not invalidate any other reasons why a work based
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38 // on this file might be covered by the GNU General Public License.
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39 // -------------------------------------------
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40 // ####ECOSGPLCOPYRIGHTEND####
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41 //=============================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): andrew.lunn
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45 // Contributors:andrew.lunn, jskov
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46 // Date: 2001-09-18
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47 //
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48 //####DESCRIPTIONEND####
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49 //
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50 //=============================================================================
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51
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52 struct dns_header {
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53 #if (CYG_BYTEORDER == CYG_LSBFIRST)
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54 unsigned id :16; /* query identification number */
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55 /* fields in third byte */
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56 unsigned rd :1; /* recursion desired */
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57 unsigned tc :1; /* truncated message */
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58 unsigned aa :1; /* authoritive answer */
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59 unsigned opcode :4; /* purpose of message */
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60 unsigned qr :1; /* response flag */
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61 /* fields in fourth byte */
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62 unsigned rcode :4; /* response code */
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63 unsigned cd: 1; /* checking disabled by resolver */
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64 unsigned ad: 1; /* authentic data from named */
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65 unsigned unused :1; /* unused bits */
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66 unsigned ra :1; /* recursion available */
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67 /* remaining bytes */
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68 unsigned qdcount :16; /* number of question entries */
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69 unsigned ancount :16; /* number of answer entries */
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70 unsigned nscount :16; /* number of authority entries */
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71 unsigned arcount :16; /* number of resource entries */
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72 #else
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73 unsigned id :16; /* query identification number */
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74 /* fields in third byte */
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75 unsigned qr :1; /* response flag */
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76 unsigned opcode :4; /* purpose of message */
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77 unsigned aa :1; /* authoritive answer */
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78 unsigned tc :1; /* truncated message */
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79 unsigned rd :1; /* recursion desired */
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80 /* fields in fourth byte */
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81 unsigned ra :1; /* recursion available */
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82 unsigned unused :1; /* unused bits */
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83 unsigned ad: 1; /* authentic data from named */
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84 unsigned cd: 1; /* checking disabled by resolver */
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85 unsigned rcode :4; /* response code */
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86 /* remaining bytes */
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87 unsigned qdcount :16; /* number of question entries */
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88 unsigned ancount :16; /* number of answer entries */
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89 unsigned nscount :16; /* number of authority entries */
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90 unsigned arcount :16; /* number of resource entries */
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91 #endif
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92 };
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93
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94 struct resource_record {
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95 unsigned rr_type : 16; /* Type of resourse */
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96 unsigned class : 16; /* Class of resource */
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97 unsigned ttl : 32; /* Time to live of this record */
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98 unsigned rdlength: 16; /* Lenght of data to follow */
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99 char rdata [2]; /* Resource DATA */
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100 };
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101
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102 /* Opcodes */
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103 #define DNS_QUERY 0 /* Standard query */
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104 #define DNS_IQUERY 1 /* Inverse query */
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105 #define DNS_STATUS 2 /* Name server status */
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106 #define DNS_NOTIFY 4 /* Zone change notification */
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107 #define DNS_UPDATE 5 /* Zone update message */
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108
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109 /* DNS TYPEs */
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110 #define DNS_TYPE_A 1 /* Host address */
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111 #define DNS_TYPE_NS 2 /* Authoritative name server */
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112 #define DNS_TYPE_CNAME 5 /* Canonical name for an alias */
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113 #define DNS_TYPE_PTR 12 /* Domain name pointer */
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114 #define DNS_TYPE_AAAA 28 /* IPv6 host address */
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115
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116 /* DNS CLASSs */
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117 #define DNS_CLASS_IN 1 /* Internet */
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118
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119 /* DNS reply codes */
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120 #define DNS_REPLY_NOERR 0
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121 #define DNS_REPLY_NAME_ERROR 3
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122
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123 #define MAXDNSMSGSIZE 512
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124
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125 //-----------------------------------------------------------------------------
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126 #endif // CYGONCE_NS_DNS_DNS_PRIV_H
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127 // End of dns-priv.h