1 | /* |
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2 | * Copyright (c) 1985, 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) 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 defined(LIBC_SCCS) && !defined(lint) |
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72 | static char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; |
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73 | static char orig_rcsid[] = "From: Id: res_init.c,v 8.7 1996/11/18 09:10:04 vixie Exp $"; |
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74 | static char rcsid[] = "$Id$"; |
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75 | #endif /* LIBC_SCCS and not lint */ |
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76 | |
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77 | #include <sys/types.h> |
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78 | #include <sys/param.h> |
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79 | #include <sys/socket.h> |
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80 | #include <sys/time.h> |
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81 | #include <netinet/in.h> |
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82 | #include <arpa/inet.h> |
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83 | #include <arpa/nameser.h> |
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84 | #include <ctype.h> |
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85 | #include <resolv.h> |
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86 | #include <stdio.h> |
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87 | #include <stdlib.h> |
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88 | #include <string.h> |
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89 | #include <unistd.h> |
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90 | |
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91 | #include "res_config.h" |
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92 | |
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93 | /* |
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94 | * RTEMS -- set up name servers from global variable |
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95 | */ |
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96 | include <rtems/rtems_bsdnet_internal.h> |
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97 | |
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98 | static void res_setoptions __P((char *, char *)); |
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99 | |
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100 | #ifdef RESOLVSORT |
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101 | static const char sort_mask[] = "/&"; |
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102 | #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) |
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103 | static u_int32_t net_mask __P((struct in_addr)); |
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104 | #endif |
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105 | |
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106 | #if !defined(isascii) /* XXX - could be a function */ |
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107 | # define isascii(c) (!(c & 0200)) |
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108 | #endif |
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109 | |
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110 | /* |
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111 | * Resolver state default settings. |
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112 | */ |
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113 | |
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114 | struct __res_state _res |
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115 | # if defined(__BIND_RES_TEXT) |
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116 | = { RES_TIMEOUT, } /* Motorola, et al. */ |
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117 | # endif |
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118 | ; |
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119 | |
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120 | |
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121 | /* |
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122 | * Set up default settings. If the configuration file exist, the values |
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123 | * there will have precedence. Otherwise, the server address is set to |
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124 | * INADDR_ANY and the default domain name comes from the gethostname(). |
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125 | * |
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126 | * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 |
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127 | * rather than INADDR_ANY ("0.0.0.0") as the default name server address |
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128 | * since it was noted that INADDR_ANY actually meant ``the first interface |
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129 | * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, |
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130 | * it had to be "up" in order for you to reach your own name server. It |
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131 | * was later decided that since the recommended practice is to always |
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132 | * install local static routes through 127.0.0.1 for all your network |
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133 | * interfaces, that we could solve this problem without a code change. |
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134 | * |
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135 | * The configuration file should always be used, since it is the only way |
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136 | * to specify a default domain. If you are running a server on your local |
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137 | * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" |
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138 | * in the configuration file. |
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139 | * |
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140 | * Return 0 if completes successfully, -1 on error |
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141 | */ |
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142 | int |
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143 | res_init() |
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144 | { |
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145 | register FILE *fp; |
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146 | register char *cp, **pp; |
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147 | register int n; |
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148 | char buf[MAXDNAME]; |
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149 | int nserv = 0; /* number of nameserver records read from file */ |
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150 | int haveenv = 0; |
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151 | int havesearch = 0; |
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152 | #ifdef RESOLVSORT |
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153 | int nsort = 0; |
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154 | char *net; |
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155 | #endif |
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156 | #ifndef RFC1535 |
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157 | int dots; |
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158 | #endif |
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159 | |
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160 | /* |
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161 | * These three fields used to be statically initialized. This made |
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162 | * it hard to use this code in a shared library. It is necessary, |
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163 | * now that we're doing dynamic initialization here, that we preserve |
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164 | * the old semantics: if an application modifies one of these three |
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165 | * fields of _res before res_init() is called, res_init() will not |
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166 | * alter them. Of course, if an application is setting them to |
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167 | * _zero_ before calling res_init(), hoping to override what used |
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168 | * to be the static default, we can't detect it and unexpected results |
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169 | * will follow. Zero for any of these fields would make no sense, |
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170 | * so one can safely assume that the applications were already getting |
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171 | * unexpected results. |
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172 | * |
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173 | * _res.options is tricky since some apps were known to diddle the bits |
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174 | * before res_init() was first called. We can't replicate that semantic |
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175 | * with dynamic initialization (they may have turned bits off that are |
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176 | * set in RES_DEFAULT). Our solution is to declare such applications |
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177 | * "broken". They could fool us by setting RES_INIT but none do (yet). |
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178 | */ |
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179 | if (!_res.retrans) |
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180 | _res.retrans = RES_TIMEOUT; |
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181 | if (!_res.retry) |
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182 | _res.retry = 4; |
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183 | if (!(_res.options & RES_INIT)) |
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184 | _res.options = RES_DEFAULT; |
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185 | |
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186 | /* |
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187 | * This one used to initialize implicitly to zero, so unless the app |
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188 | * has set it to something in particular, we can randomize it now. |
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189 | */ |
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190 | if (!_res.id) |
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191 | _res.id = res_randomid(); |
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192 | |
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193 | #ifdef USELOOPBACK |
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194 | _res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); |
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195 | #else |
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196 | _res.nsaddr.sin_addr.s_addr = INADDR_ANY; |
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197 | #endif |
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198 | _res.nsaddr.sin_family = AF_INET; |
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199 | _res.nsaddr.sin_port = htons(NAMESERVER_PORT); |
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200 | _res.nscount = 1; |
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201 | _res.ndots = 1; |
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202 | _res.pfcode = 0; |
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203 | |
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204 | /* |
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205 | * RTEMS -- Set up name servers |
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206 | */ |
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207 | { |
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208 | int n = 0; |
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209 | while ((n < rtems_bsdnet_nameserver_count) && (nserv < MAXNS)) { |
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210 | _res.nsaddr_list[nserv].sin_addr = rtems_bsdnet_nameserver[n]; |
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211 | _res.nsaddr_list[nserv].sin_family = AF_INET; |
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212 | _res.nsaddr_list[nserv].sin_port = htons(NAMESERVER_PORT); |
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213 | nserv++; |
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214 | n++; |
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215 | } |
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216 | if (rtems_bsdnet_domain_name) |
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217 | (void)strncpy(_res.defdname, rtems_bsdnet_domain_name, sizeof(_res.defdname) - 1); |
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218 | } |
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219 | |
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220 | /* Allow user to override the local domain definition */ |
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221 | if ((cp = getenv("LOCALDOMAIN")) != NULL) { |
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222 | (void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1); |
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223 | haveenv++; |
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224 | |
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225 | /* |
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226 | * Set search list to be blank-separated strings |
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227 | * from rest of env value. Permits users of LOCALDOMAIN |
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228 | * to still have a search list, and anyone to set the |
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229 | * one that they want to use as an individual (even more |
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230 | * important now that the rfc1535 stuff restricts searches) |
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231 | */ |
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232 | cp = _res.defdname; |
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233 | pp = _res.dnsrch; |
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234 | *pp++ = cp; |
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235 | for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) { |
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236 | if (*cp == '\n') /* silly backwards compat */ |
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237 | break; |
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238 | else if (*cp == ' ' || *cp == '\t') { |
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239 | *cp = 0; |
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240 | n = 1; |
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241 | } else if (n) { |
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242 | *pp++ = cp; |
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243 | n = 0; |
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244 | havesearch = 1; |
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245 | } |
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246 | } |
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247 | /* null terminate last domain if there are excess */ |
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248 | while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') |
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249 | cp++; |
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250 | *cp = '\0'; |
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251 | *pp++ = 0; |
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252 | } |
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253 | |
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254 | #define MATCH(line, name) \ |
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255 | (!strncmp(line, name, sizeof(name) - 1) && \ |
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256 | (line[sizeof(name) - 1] == ' ' || \ |
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257 | line[sizeof(name) - 1] == '\t')) |
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258 | |
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259 | if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) { |
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260 | /* read the config file */ |
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261 | while (fgets(buf, sizeof(buf), fp) != NULL) { |
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262 | /* skip comments */ |
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263 | if (*buf == ';' || *buf == '#') |
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264 | continue; |
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265 | /* read default domain name */ |
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266 | if (MATCH(buf, "domain")) { |
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267 | if (haveenv) /* skip if have from environ */ |
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268 | continue; |
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269 | cp = buf + sizeof("domain") - 1; |
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270 | while (*cp == ' ' || *cp == '\t') |
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271 | cp++; |
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272 | if ((*cp == '\0') || (*cp == '\n')) |
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273 | continue; |
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274 | strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1); |
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275 | if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL) |
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276 | *cp = '\0'; |
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277 | havesearch = 0; |
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278 | continue; |
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279 | } |
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280 | /* set search list */ |
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281 | if (MATCH(buf, "search")) { |
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282 | if (haveenv) /* skip if have from environ */ |
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283 | continue; |
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284 | cp = buf + sizeof("search") - 1; |
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285 | while (*cp == ' ' || *cp == '\t') |
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286 | cp++; |
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287 | if ((*cp == '\0') || (*cp == '\n')) |
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288 | continue; |
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289 | strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1); |
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290 | if ((cp = strchr(_res.defdname, '\n')) != NULL) |
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291 | *cp = '\0'; |
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292 | /* |
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293 | * Set search list to be blank-separated strings |
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294 | * on rest of line. |
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295 | */ |
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296 | cp = _res.defdname; |
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297 | pp = _res.dnsrch; |
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298 | *pp++ = cp; |
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299 | for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) { |
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300 | if (*cp == ' ' || *cp == '\t') { |
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301 | *cp = 0; |
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302 | n = 1; |
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303 | } else if (n) { |
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304 | *pp++ = cp; |
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305 | n = 0; |
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306 | } |
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307 | } |
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308 | /* null terminate last domain if there are excess */ |
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309 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') |
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310 | cp++; |
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311 | *cp = '\0'; |
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312 | *pp++ = 0; |
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313 | havesearch = 1; |
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314 | continue; |
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315 | } |
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316 | /* read nameservers to query */ |
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317 | if (MATCH(buf, "nameserver") && nserv < MAXNS) { |
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318 | struct in_addr a; |
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319 | |
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320 | cp = buf + sizeof("nameserver") - 1; |
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321 | while (*cp == ' ' || *cp == '\t') |
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322 | cp++; |
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323 | if ((*cp != '\0') && (*cp != '\n') && inet_aton(cp, &a)) { |
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324 | _res.nsaddr_list[nserv].sin_addr = a; |
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325 | _res.nsaddr_list[nserv].sin_family = AF_INET; |
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326 | _res.nsaddr_list[nserv].sin_port = |
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327 | htons(NAMESERVER_PORT); |
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328 | nserv++; |
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329 | } |
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330 | continue; |
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331 | } |
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332 | #ifdef RESOLVSORT |
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333 | if (MATCH(buf, "sortlist")) { |
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334 | struct in_addr a; |
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335 | |
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336 | cp = buf + sizeof("sortlist") - 1; |
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337 | while (nsort < MAXRESOLVSORT) { |
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338 | while (*cp == ' ' || *cp == '\t') |
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339 | cp++; |
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340 | if (*cp == '\0' || *cp == '\n' || *cp == ';') |
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341 | break; |
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342 | net = cp; |
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343 | while (*cp && !ISSORTMASK(*cp) && *cp != ';' && |
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344 | isascii((int)*cp) && !isspace((int)*cp)) |
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345 | cp++; |
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346 | n = *cp; |
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347 | *cp = 0; |
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348 | if (inet_aton(net, &a)) { |
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349 | _res.sort_list[nsort].addr = a; |
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350 | if (ISSORTMASK(n)) { |
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351 | *cp++ = n; |
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352 | net = cp; |
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353 | while (*cp && *cp != ';' && |
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354 | isascii((int)*cp) && !isspace((int)*cp)) |
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355 | cp++; |
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356 | n = *cp; |
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357 | *cp = 0; |
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358 | if (inet_aton(net, &a)) { |
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359 | _res.sort_list[nsort].mask = a.s_addr; |
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360 | } else { |
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361 | _res.sort_list[nsort].mask = |
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362 | net_mask(_res.sort_list[nsort].addr); |
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363 | } |
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364 | } else { |
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365 | _res.sort_list[nsort].mask = |
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366 | net_mask(_res.sort_list[nsort].addr); |
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367 | } |
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368 | nsort++; |
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369 | } |
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370 | *cp = n; |
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371 | } |
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372 | continue; |
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373 | } |
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374 | #endif |
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375 | if (MATCH(buf, "options")) { |
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376 | res_setoptions(buf + sizeof("options") - 1, "conf"); |
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377 | continue; |
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378 | } |
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379 | } |
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380 | if (nserv > 1) |
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381 | _res.nscount = nserv; |
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382 | #ifdef RESOLVSORT |
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383 | _res.nsort = nsort; |
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384 | #endif |
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385 | (void) fclose(fp); |
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386 | } |
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387 | if (_res.defdname[0] == 0 && |
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388 | gethostname(buf, sizeof(_res.defdname) - 1) == 0 && |
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389 | (cp = strchr(buf, '.')) != NULL) |
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390 | strcpy(_res.defdname, cp + 1); |
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391 | |
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392 | /* find components of local domain that might be searched */ |
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393 | if (havesearch == 0) { |
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394 | pp = _res.dnsrch; |
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395 | *pp++ = _res.defdname; |
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396 | *pp = NULL; |
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397 | |
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398 | #ifndef RFC1535 |
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399 | dots = 0; |
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400 | for (cp = _res.defdname; *cp; cp++) |
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401 | dots += (*cp == '.'); |
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402 | |
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403 | cp = _res.defdname; |
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404 | while (pp < _res.dnsrch + MAXDFLSRCH) { |
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405 | if (dots < LOCALDOMAINPARTS) |
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406 | break; |
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407 | cp = strchr(cp, '.') + 1; /* we know there is one */ |
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408 | *pp++ = cp; |
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409 | dots--; |
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410 | } |
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411 | *pp = NULL; |
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412 | #ifdef DEBUG |
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413 | if (_res.options & RES_DEBUG) { |
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414 | printf(";; res_init()... default dnsrch list:\n"); |
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415 | for (pp = _res.dnsrch; *pp; pp++) |
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416 | printf(";;\t%s\n", *pp); |
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417 | printf(";;\t..END..\n"); |
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418 | } |
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419 | #endif |
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420 | #endif /* !RFC1535 */ |
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421 | } |
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422 | |
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423 | if ((cp = getenv("RES_OPTIONS")) != NULL) |
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424 | res_setoptions(cp, "env"); |
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425 | _res.options |= RES_INIT; |
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426 | return (0); |
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427 | } |
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428 | |
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429 | static void |
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430 | res_setoptions(options, source) |
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431 | char *options, *source; |
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432 | { |
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433 | char *cp = options; |
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434 | int i; |
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435 | |
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436 | #ifdef DEBUG |
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437 | if (_res.options & RES_DEBUG) |
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438 | printf(";; res_setoptions(\"%s\", \"%s\")...\n", |
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439 | options, source); |
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440 | #endif |
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441 | while (*cp) { |
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442 | /* skip leading and inner runs of spaces */ |
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443 | while (*cp == ' ' || *cp == '\t') |
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444 | cp++; |
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445 | /* search for and process individual options */ |
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446 | if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { |
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447 | i = atoi(cp + sizeof("ndots:") - 1); |
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448 | if (i <= RES_MAXNDOTS) |
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449 | _res.ndots = i; |
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450 | else |
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451 | _res.ndots = RES_MAXNDOTS; |
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452 | #ifdef DEBUG |
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453 | if (_res.options & RES_DEBUG) |
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454 | printf(";;\tndots=%d\n", _res.ndots); |
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455 | #endif |
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456 | } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { |
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457 | #ifdef DEBUG |
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458 | if (!(_res.options & RES_DEBUG)) { |
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459 | printf(";; res_setoptions(\"%s\", \"%s\")..\n", |
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460 | options, source); |
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461 | _res.options |= RES_DEBUG; |
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462 | } |
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463 | printf(";;\tdebug\n"); |
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464 | #endif |
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465 | } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { |
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466 | _res.options |= RES_USE_INET6; |
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467 | } else if (!strncmp(cp, "no_tld_query", sizeof("no_tld_query") - 1)) { |
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468 | _res.options |= RES_NOTLDQUERY; |
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469 | } else { |
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470 | /* XXX - print a warning here? */ |
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471 | } |
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472 | /* skip to next run of spaces */ |
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473 | while (*cp && *cp != ' ' && *cp != '\t') |
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474 | cp++; |
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475 | } |
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476 | } |
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477 | |
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478 | #ifdef RESOLVSORT |
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479 | /* XXX - should really support CIDR which means explicit masks always. */ |
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480 | static u_int32_t |
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481 | net_mask(in) /* XXX - should really use system's version of this */ |
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482 | struct in_addr in; |
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483 | { |
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484 | register u_int32_t i = ntohl(in.s_addr); |
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485 | |
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486 | if (IN_CLASSA(i)) |
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487 | return (htonl(IN_CLASSA_NET)); |
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488 | else if (IN_CLASSB(i)) |
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489 | return (htonl(IN_CLASSB_NET)); |
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490 | return (htonl(IN_CLASSC_NET)); |
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491 | } |
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492 | #endif |
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493 | |
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494 | u_int |
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495 | res_randomid() |
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496 | { |
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497 | struct timeval now; |
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498 | |
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499 | gettimeofday(&now, NULL); |
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500 | return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); |
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501 | } |
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