1 | /* |
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2 | * Copyright (c) 1985, 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) 1993 by Digital Equipment Corporation. |
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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, and that |
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40 | * the name of Digital Equipment Corporation not be used in advertising or |
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41 | * publicity pertaining to distribution of the document or software without |
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42 | * specific, written prior permission. |
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43 | * |
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44 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
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45 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES |
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46 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT |
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47 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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48 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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49 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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50 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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51 | * SOFTWARE. |
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52 | */ |
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53 | |
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54 | /* |
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55 | * Portions Copyright (c) 1996 by Internet Software Consortium. |
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56 | * |
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57 | * Permission to use, copy, modify, and distribute this software for any |
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58 | * purpose with or without fee is hereby granted, provided that the above |
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59 | * copyright notice and this permission notice appear in all copies. |
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60 | * |
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61 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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62 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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63 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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64 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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65 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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66 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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67 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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68 | * SOFTWARE. |
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69 | */ |
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70 | |
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71 | #if HAVE_CONFIG_H |
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72 | #include "config.h" |
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73 | #endif |
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74 | |
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75 | #include <sys/types.h> |
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76 | #include <sys/param.h> |
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77 | #include <netinet/in.h> |
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78 | #include <arpa/nameser.h> |
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79 | #include <ctype.h> |
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80 | #include <resolv.h> |
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81 | #include <stdio.h> |
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82 | #include <string.h> |
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83 | #include <unistd.h> |
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84 | |
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85 | #define BIND_4_COMPAT |
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86 | |
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87 | /* |
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88 | * Expand compressed domain name 'comp_dn' to full domain name. |
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89 | * 'msg' is a pointer to the begining of the message, |
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90 | * 'eomorig' points to the first location after the message, |
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91 | * 'exp_dn' is a pointer to a buffer of size 'length' for the result. |
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92 | * Return size of compressed name or -1 if there was an error. |
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93 | */ |
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94 | int |
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95 | dn_expand(const u_char *msg, const u_char *eom, const u_char *src, |
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96 | char *dst, int dstsiz) |
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97 | { |
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98 | int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz); |
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99 | |
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100 | if (n > 0 && dst[0] == '.') |
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101 | dst[0] = '\0'; |
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102 | return (n); |
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103 | } |
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104 | |
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105 | /* |
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106 | * Pack domain name 'exp_dn' in presentation form into 'comp_dn'. |
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107 | * Return the size of the compressed name or -1. |
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108 | * 'length' is the size of the array pointed to by 'comp_dn'. |
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109 | */ |
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110 | int |
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111 | dn_comp(const char *src, u_char *dst, int dstsiz, |
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112 | u_char **dnptrs, u_char **lastdnptr) |
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113 | { |
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114 | return (ns_name_compress(src, dst, (size_t)dstsiz, |
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115 | (const u_char **)dnptrs, |
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116 | (const u_char **)lastdnptr)); |
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117 | } |
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118 | |
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119 | /* |
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120 | * Skip over a compressed domain name. Return the size or -1. |
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121 | */ |
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122 | int |
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123 | dn_skipname(const u_char *ptr, const u_char *eom) { |
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124 | const u_char *saveptr = ptr; |
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125 | |
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126 | if (ns_name_skip(&ptr, eom) == -1) |
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127 | return (-1); |
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128 | return (ptr - saveptr); |
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129 | } |
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130 | |
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131 | /* |
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132 | * Verify that a domain name uses an acceptable character set. |
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133 | */ |
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134 | |
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135 | /* |
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136 | * Note the conspicuous absence of ctype macros in these definitions. On |
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137 | * non-ASCII hosts, we can't depend on string literals or ctype macros to |
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138 | * tell us anything about network-format data. The rest of the BIND system |
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139 | * is not careful about this, but for some reason, we're doing it right here. |
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140 | */ |
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141 | #define PERIOD 0x2e |
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142 | #define hyphenchar(c) ((c) == 0x2d) |
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143 | #define bslashchar(c) ((c) == 0x5c) |
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144 | #define periodchar(c) ((c) == PERIOD) |
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145 | #define asterchar(c) ((c) == 0x2a) |
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146 | #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \ |
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147 | || ((c) >= 0x61 && (c) <= 0x7a)) |
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148 | #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39) |
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149 | |
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150 | #define borderchar(c) (alphachar(c) || digitchar(c)) |
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151 | #define middlechar(c) (borderchar(c) || hyphenchar(c)) |
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152 | #define domainchar(c) ((c) > 0x20 && (c) < 0x7f) |
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153 | |
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154 | int |
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155 | res_hnok(dn) |
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156 | const char *dn; |
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157 | { |
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158 | int ppch = '\0', pch = PERIOD, ch = *dn++; |
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159 | |
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160 | while (ch != '\0') { |
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161 | int nch = *dn++; |
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162 | |
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163 | if (periodchar(ch)) { |
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164 | (void)NULL; |
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165 | } else if (periodchar(pch)) { |
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166 | if (!borderchar(ch)) |
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167 | return (0); |
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168 | } else if (periodchar(nch) || nch == '\0') { |
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169 | if (!borderchar(ch)) |
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170 | return (0); |
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171 | } else { |
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172 | if (!middlechar(ch)) |
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173 | return (0); |
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174 | } |
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175 | ppch = pch, pch = ch, ch = nch; |
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176 | } |
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177 | return (1); |
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178 | } |
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179 | |
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180 | /* |
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181 | * hostname-like (A, MX, WKS) owners can have "*" as their first label |
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182 | * but must otherwise be as a host name. |
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183 | */ |
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184 | int |
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185 | res_ownok(dn) |
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186 | const char *dn; |
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187 | { |
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188 | if (asterchar(dn[0])) { |
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189 | if (periodchar(dn[1])) |
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190 | return (res_hnok(dn+2)); |
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191 | if (dn[1] == '\0') |
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192 | return (1); |
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193 | } |
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194 | return (res_hnok(dn)); |
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195 | } |
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196 | |
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197 | /* |
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198 | * SOA RNAMEs and RP RNAMEs can have any printable character in their first |
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199 | * label, but the rest of the name has to look like a host name. |
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200 | */ |
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201 | int |
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202 | res_mailok(dn) |
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203 | const char *dn; |
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204 | { |
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205 | int ch, escaped = 0; |
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206 | |
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207 | /* "." is a valid missing representation */ |
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208 | if (*dn == '\0') |
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209 | return (1); |
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210 | |
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211 | /* otherwise <label>.<hostname> */ |
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212 | while ((ch = *dn++) != '\0') { |
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213 | if (!domainchar(ch)) |
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214 | return (0); |
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215 | if (!escaped && periodchar(ch)) |
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216 | break; |
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217 | if (escaped) |
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218 | escaped = 0; |
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219 | else if (bslashchar(ch)) |
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220 | escaped = 1; |
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221 | } |
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222 | if (periodchar(ch)) |
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223 | return (res_hnok(dn)); |
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224 | return (0); |
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225 | } |
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226 | |
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227 | /* |
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228 | * This function is quite liberal, since RFC 1034's character sets are only |
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229 | * recommendations. |
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230 | */ |
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231 | int |
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232 | res_dnok(dn) |
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233 | const char *dn; |
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234 | { |
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235 | int ch; |
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236 | |
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237 | while ((ch = *dn++) != '\0') |
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238 | if (!domainchar(ch)) |
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239 | return (0); |
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240 | return (1); |
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241 | } |
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242 | |
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243 | #ifdef BIND_4_COMPAT |
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244 | /* |
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245 | * This module must export the following externally-visible symbols: |
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246 | * ___putlong |
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247 | * ___putshort |
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248 | * __getlong |
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249 | * __getshort |
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250 | * Note that one _ comes from C and the others come from us. |
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251 | */ |
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252 | void __putlong(u_int32_t src, u_char *dst) { ns_put32(src, dst); } |
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253 | void __putshort(u_int16_t src, u_char *dst) { ns_put16(src, dst); } |
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254 | u_int32_t _getlong(const u_char *src) { return (ns_get32(src)); } |
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255 | u_int16_t _getshort(const u_char *src) { return (ns_get16(src)); } |
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256 | #endif /*BIND_4_COMPAT*/ |
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