1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /* |
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4 | * Portions Copyright (C) 2004, 2005, 2008 Internet Systems Consortium, Inc. ("ISC") |
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5 | * Portions Copyright (C) 1996-2001, 2003 Internet Software Consortium. |
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6 | * |
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7 | * Permission to use, copy, modify, and/or distribute this software for any |
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8 | * purpose with or without fee is hereby granted, provided that the above |
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9 | * copyright notice and this permission notice appear in all copies. |
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10 | * |
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11 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH |
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12 | * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY |
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13 | * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, |
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14 | * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM |
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15 | * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE |
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16 | * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
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17 | * PERFORMANCE OF THIS SOFTWARE. |
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18 | */ |
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19 | |
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20 | /* |
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21 | * Copyright (c) 1988, 1993 |
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22 | * The Regents of the University of California. All rights reserved. |
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23 | * |
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24 | * Redistribution and use in source and binary forms, with or without |
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25 | * modification, are permitted provided that the following conditions |
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26 | * are met: |
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27 | * 1. Redistributions of source code must retain the above copyright |
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28 | * notice, this list of conditions and the following disclaimer. |
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29 | * 2. Redistributions in binary form must reproduce the above copyright |
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30 | * notice, this list of conditions and the following disclaimer in the |
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31 | * documentation and/or other materials provided with the distribution. |
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32 | * 4. Neither the name of the University nor the names of its contributors |
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33 | * may be used to endorse or promote products derived from this software |
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34 | * without specific prior written permission. |
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35 | * |
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36 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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37 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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38 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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39 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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40 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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41 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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42 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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43 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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44 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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45 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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46 | * SUCH DAMAGE. |
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47 | */ |
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48 | |
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49 | /* |
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50 | * Portions Copyright (c) 1993 by Digital Equipment Corporation. |
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51 | * |
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52 | * Permission to use, copy, modify, and distribute this software for any |
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53 | * purpose with or without fee is hereby granted, provided that the above |
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54 | * copyright notice and this permission notice appear in all copies, and that |
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55 | * the name of Digital Equipment Corporation not be used in advertising or |
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56 | * publicity pertaining to distribution of the document or software without |
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57 | * specific, written prior permission. |
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58 | * |
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59 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
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60 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES |
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61 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT |
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62 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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63 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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64 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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65 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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66 | * SOFTWARE. |
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67 | */ |
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68 | |
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69 | #if defined(LIBC_SCCS) && !defined(lint) |
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70 | static const char sccsid[] = "@(#)res_query.c 8.1 (Berkeley) 6/4/93"; |
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71 | static const char rcsid[] = "$Id: res_query.c,v 1.11 2008/11/14 02:36:51 marka Exp $"; |
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72 | #endif /* LIBC_SCCS and not lint */ |
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73 | #include <sys/cdefs.h> |
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74 | __FBSDID("$FreeBSD$"); |
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75 | |
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76 | #include "port_before.h" |
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77 | #include <sys/types.h> |
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78 | #include <rtems/bsd/sys/param.h> |
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79 | #include <netinet/in.h> |
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80 | #include <arpa/inet.h> |
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81 | #include <arpa/nameser.h> |
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82 | #include <ctype.h> |
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83 | #include <errno.h> |
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84 | #include <netdb.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 | #include "port_after.h" |
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91 | |
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92 | /* Options. Leave them on. */ |
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93 | #define DEBUG |
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94 | |
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95 | #if PACKETSZ > 1024 |
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96 | #define MAXPACKET PACKETSZ |
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97 | #else |
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98 | #define MAXPACKET 1024 |
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99 | #endif |
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100 | |
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101 | /*% |
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102 | * Formulate a normal query, send, and await answer. |
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103 | * Returned answer is placed in supplied buffer "answer". |
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104 | * Perform preliminary check of answer, returning success only |
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105 | * if no error is indicated and the answer count is nonzero. |
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106 | * Return the size of the response on success, -1 on error. |
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107 | * Error number is left in H_ERRNO. |
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108 | * |
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109 | * Caller must parse answer and determine whether it answers the question. |
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110 | */ |
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111 | int |
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112 | res_nquery(res_state statp, |
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113 | const char *name, /*%< domain name */ |
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114 | int class, int type, /*%< class and type of query */ |
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115 | u_char *answer, /*%< buffer to put answer */ |
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116 | int anslen) /*%< size of answer buffer */ |
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117 | { |
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118 | u_char buf[MAXPACKET]; |
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119 | HEADER *hp = (HEADER *) answer; |
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120 | u_int oflags; |
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121 | u_char *rdata; |
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122 | int n; |
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123 | |
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124 | oflags = statp->_flags; |
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125 | |
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126 | again: |
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127 | hp->rcode = NOERROR; /*%< default */ |
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128 | #ifdef DEBUG |
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129 | if (statp->options & RES_DEBUG) |
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130 | printf(";; res_query(%s, %d, %d)\n", name, class, type); |
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131 | #endif |
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132 | |
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133 | n = res_nmkquery(statp, QUERY, name, class, type, NULL, 0, NULL, |
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134 | buf, sizeof(buf)); |
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135 | #ifdef RES_USE_EDNS0 |
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136 | if (n > 0 && (statp->_flags & RES_F_EDNS0ERR) == 0 && |
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137 | (statp->options & (RES_USE_EDNS0|RES_USE_DNSSEC|RES_NSID))) { |
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138 | n = res_nopt(statp, n, buf, sizeof(buf), anslen); |
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139 | rdata = &buf[n]; |
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140 | if (n > 0 && (statp->options & RES_NSID) != 0U) { |
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141 | n = res_nopt_rdata(statp, n, buf, sizeof(buf), rdata, |
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142 | NS_OPT_NSID, 0, NULL); |
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143 | } |
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144 | } |
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145 | #endif |
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146 | if (n <= 0) { |
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147 | #ifdef DEBUG |
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148 | if (statp->options & RES_DEBUG) |
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149 | printf(";; res_query: mkquery failed\n"); |
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150 | #endif |
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151 | RES_SET_H_ERRNO(statp, NO_RECOVERY); |
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152 | return (n); |
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153 | } |
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154 | |
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155 | n = res_nsend(statp, buf, n, answer, anslen); |
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156 | if (n < 0) { |
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157 | #ifdef RES_USE_EDNS0 |
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158 | /* if the query choked with EDNS0, retry without EDNS0 */ |
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159 | if ((statp->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U && |
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160 | ((oflags ^ statp->_flags) & RES_F_EDNS0ERR) != 0) { |
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161 | statp->_flags |= RES_F_EDNS0ERR; |
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162 | if (statp->options & RES_DEBUG) |
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163 | printf(";; res_nquery: retry without EDNS0\n"); |
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164 | goto again; |
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165 | } |
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166 | #endif |
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167 | #ifdef DEBUG |
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168 | if (statp->options & RES_DEBUG) |
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169 | printf(";; res_query: send error\n"); |
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170 | #endif |
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171 | RES_SET_H_ERRNO(statp, TRY_AGAIN); |
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172 | return (n); |
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173 | } |
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174 | |
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175 | if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) { |
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176 | #ifdef DEBUG |
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177 | if (statp->options & RES_DEBUG) |
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178 | printf(";; rcode = (%s), counts = an:%d ns:%d ar:%d\n", |
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179 | p_rcode(hp->rcode), |
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180 | ntohs(hp->ancount), |
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181 | ntohs(hp->nscount), |
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182 | ntohs(hp->arcount)); |
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183 | #endif |
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184 | switch (hp->rcode) { |
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185 | case NXDOMAIN: |
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186 | RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); |
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187 | break; |
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188 | case SERVFAIL: |
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189 | RES_SET_H_ERRNO(statp, TRY_AGAIN); |
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190 | break; |
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191 | case NOERROR: |
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192 | RES_SET_H_ERRNO(statp, NO_DATA); |
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193 | break; |
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194 | case FORMERR: |
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195 | case NOTIMP: |
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196 | case REFUSED: |
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197 | default: |
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198 | RES_SET_H_ERRNO(statp, NO_RECOVERY); |
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199 | break; |
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200 | } |
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201 | return (-1); |
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202 | } |
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203 | return (n); |
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204 | } |
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205 | |
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206 | /*% |
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207 | * Formulate a normal query, send, and retrieve answer in supplied buffer. |
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208 | * Return the size of the response on success, -1 on error. |
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209 | * If enabled, implement search rules until answer or unrecoverable failure |
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210 | * is detected. Error code, if any, is left in H_ERRNO. |
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211 | */ |
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212 | int |
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213 | res_nsearch(res_state statp, |
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214 | const char *name, /*%< domain name */ |
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215 | int class, int type, /*%< class and type of query */ |
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216 | u_char *answer, /*%< buffer to put answer */ |
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217 | int anslen) /*%< size of answer */ |
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218 | { |
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219 | const char *cp, * const *domain; |
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220 | HEADER *hp = (HEADER *) answer; |
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221 | char tmp[NS_MAXDNAME]; |
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222 | u_int dots; |
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223 | int trailing_dot, ret, saved_herrno; |
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224 | int got_nodata = 0, got_servfail = 0, root_on_list = 0; |
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225 | int tried_as_is = 0; |
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226 | int searched = 0; |
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227 | |
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228 | errno = 0; |
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229 | RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); /*%< True if we never query. */ |
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230 | dots = 0; |
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231 | for (cp = name; *cp != '\0'; cp++) |
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232 | dots += (*cp == '.'); |
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233 | trailing_dot = 0; |
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234 | if (cp > name && *--cp == '.') |
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235 | trailing_dot++; |
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236 | |
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237 | /* If there aren't any dots, it could be a user-level alias. */ |
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238 | if (!dots && (cp = res_hostalias(statp, name, tmp, sizeof tmp))!= NULL) |
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239 | return (res_nquery(statp, cp, class, type, answer, anslen)); |
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240 | |
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241 | /* |
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242 | * If there are enough dots in the name, let's just give it a |
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243 | * try 'as is'. The threshold can be set with the "ndots" option. |
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244 | * Also, query 'as is', if there is a trailing dot in the name. |
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245 | */ |
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246 | saved_herrno = -1; |
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247 | if (dots >= statp->ndots || trailing_dot) { |
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248 | ret = res_nquerydomain(statp, name, NULL, class, type, |
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249 | answer, anslen); |
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250 | if (ret > 0 || trailing_dot) |
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251 | return (ret); |
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252 | if (errno == ECONNREFUSED) { |
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253 | RES_SET_H_ERRNO(statp, TRY_AGAIN); |
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254 | return (-1); |
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255 | } |
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256 | switch (statp->res_h_errno) { |
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257 | case NO_DATA: |
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258 | case HOST_NOT_FOUND: |
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259 | break; |
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260 | case TRY_AGAIN: |
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261 | if (hp->rcode == SERVFAIL) |
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262 | break; |
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263 | /* FALLTHROUGH */ |
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264 | default: |
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265 | return (-1); |
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266 | } |
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267 | saved_herrno = statp->res_h_errno; |
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268 | tried_as_is++; |
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269 | } |
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270 | |
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271 | /* |
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272 | * We do at least one level of search if |
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273 | * - there is no dot and RES_DEFNAME is set, or |
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274 | * - there is at least one dot, there is no trailing dot, |
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275 | * and RES_DNSRCH is set. |
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276 | */ |
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277 | if ((!dots && (statp->options & RES_DEFNAMES) != 0U) || |
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278 | (dots && !trailing_dot && (statp->options & RES_DNSRCH) != 0U)) { |
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279 | int done = 0; |
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280 | |
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281 | for (domain = (const char * const *)statp->dnsrch; |
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282 | *domain && !done; |
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283 | domain++) { |
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284 | searched = 1; |
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285 | |
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286 | if (domain[0][0] == '\0' || |
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287 | (domain[0][0] == '.' && domain[0][1] == '\0')) |
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288 | root_on_list++; |
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289 | |
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290 | if (root_on_list && tried_as_is) |
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291 | continue; |
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292 | |
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293 | ret = res_nquerydomain(statp, name, *domain, |
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294 | class, type, |
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295 | answer, anslen); |
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296 | if (ret > 0) |
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297 | return (ret); |
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298 | |
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299 | /* |
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300 | * If no server present, give up. |
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301 | * If name isn't found in this domain, |
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302 | * keep trying higher domains in the search list |
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303 | * (if that's enabled). |
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304 | * On a NO_DATA error, keep trying, otherwise |
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305 | * a wildcard entry of another type could keep us |
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306 | * from finding this entry higher in the domain. |
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307 | * If we get some other error (negative answer or |
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308 | * server failure), then stop searching up, |
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309 | * but try the input name below in case it's |
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310 | * fully-qualified. |
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311 | */ |
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312 | if (errno == ECONNREFUSED) { |
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313 | RES_SET_H_ERRNO(statp, TRY_AGAIN); |
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314 | return (-1); |
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315 | } |
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316 | |
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317 | switch (statp->res_h_errno) { |
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318 | case NO_DATA: |
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319 | got_nodata++; |
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320 | /* FALLTHROUGH */ |
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321 | case HOST_NOT_FOUND: |
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322 | /* keep trying */ |
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323 | break; |
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324 | case TRY_AGAIN: |
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325 | /* |
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326 | * This can occur due to a server failure |
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327 | * (that is, all listed servers have failed), |
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328 | * or all listed servers have timed out. |
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329 | * ((HEADER *)answer)->rcode may not be set |
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330 | * to SERVFAIL in the case of a timeout. |
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331 | * |
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332 | * Either way we must return TRY_AGAIN in |
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333 | * order to avoid non-deterministic |
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334 | * return codes. |
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335 | * For example, loaded name servers or races |
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336 | * against network startup/validation (dhcp, |
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337 | * ppp, etc) can cause the search to timeout |
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338 | * on one search element, e.g. 'fu.bar.com', |
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339 | * and return a definitive failure on the |
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340 | * next search element, e.g. 'fu.'. |
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341 | */ |
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342 | got_servfail++; |
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343 | if (hp->rcode == SERVFAIL) { |
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344 | /* try next search element, if any */ |
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345 | break; |
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346 | } |
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347 | /* FALLTHROUGH */ |
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348 | default: |
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349 | /* anything else implies that we're done */ |
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350 | done++; |
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351 | } |
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352 | |
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353 | /* if we got here for some reason other than DNSRCH, |
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354 | * we only wanted one iteration of the loop, so stop. |
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355 | */ |
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356 | if ((statp->options & RES_DNSRCH) == 0U) |
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357 | done++; |
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358 | } |
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359 | } |
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360 | |
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361 | switch (statp->res_h_errno) { |
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362 | case NO_DATA: |
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363 | case HOST_NOT_FOUND: |
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364 | break; |
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365 | case TRY_AGAIN: |
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366 | if (hp->rcode == SERVFAIL) |
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367 | break; |
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368 | /* FALLTHROUGH */ |
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369 | default: |
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370 | goto giveup; |
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371 | } |
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372 | |
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373 | /* |
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374 | * If the query has not already been tried as is then try it |
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375 | * unless RES_NOTLDQUERY is set and there were no dots. |
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376 | */ |
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377 | if ((dots || !searched || (statp->options & RES_NOTLDQUERY) == 0U) && |
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378 | !(tried_as_is || root_on_list)) { |
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379 | ret = res_nquerydomain(statp, name, NULL, class, type, |
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380 | answer, anslen); |
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381 | if (ret > 0) |
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382 | return (ret); |
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383 | } |
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384 | |
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385 | /* if we got here, we didn't satisfy the search. |
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386 | * if we did an initial full query, return that query's H_ERRNO |
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387 | * (note that we wouldn't be here if that query had succeeded). |
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388 | * else if we ever got a nodata, send that back as the reason. |
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389 | * else send back meaningless H_ERRNO, that being the one from |
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390 | * the last DNSRCH we did. |
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391 | */ |
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392 | giveup: |
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393 | if (saved_herrno != -1) |
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394 | RES_SET_H_ERRNO(statp, saved_herrno); |
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395 | else if (got_nodata) |
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396 | RES_SET_H_ERRNO(statp, NO_DATA); |
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397 | else if (got_servfail) |
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398 | RES_SET_H_ERRNO(statp, TRY_AGAIN); |
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399 | return (-1); |
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400 | } |
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401 | |
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402 | /*% |
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403 | * Perform a call on res_query on the concatenation of name and domain, |
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404 | * removing a trailing dot from name if domain is NULL. |
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405 | */ |
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406 | int |
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407 | res_nquerydomain(res_state statp, |
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408 | const char *name, |
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409 | const char *domain, |
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410 | int class, int type, /*%< class and type of query */ |
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411 | u_char *answer, /*%< buffer to put answer */ |
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412 | int anslen) /*%< size of answer */ |
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413 | { |
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414 | char nbuf[MAXDNAME]; |
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415 | const char *longname = nbuf; |
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416 | int n, d; |
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417 | |
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418 | #ifdef DEBUG |
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419 | if (statp->options & RES_DEBUG) |
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420 | printf(";; res_nquerydomain(%s, %s, %d, %d)\n", |
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421 | name, domain?domain:"<Nil>", class, type); |
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422 | #endif |
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423 | if (domain == NULL) { |
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424 | /* |
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425 | * Check for trailing '.'; |
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426 | * copy without '.' if present. |
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427 | */ |
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428 | n = strlen(name); |
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429 | if (n >= MAXDNAME) { |
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430 | RES_SET_H_ERRNO(statp, NO_RECOVERY); |
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431 | return (-1); |
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432 | } |
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433 | n--; |
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434 | if (n >= 0 && name[n] == '.') { |
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435 | strncpy(nbuf, name, n); |
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436 | nbuf[n] = '\0'; |
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437 | } else |
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438 | longname = name; |
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439 | } else { |
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440 | n = strlen(name); |
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441 | d = strlen(domain); |
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442 | if (n + d + 1 >= MAXDNAME) { |
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443 | RES_SET_H_ERRNO(statp, NO_RECOVERY); |
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444 | return (-1); |
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445 | } |
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446 | sprintf(nbuf, "%s.%s", name, domain); |
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447 | } |
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448 | return (res_nquery(statp, longname, class, type, answer, anslen)); |
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449 | } |
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450 | |
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451 | const char * |
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452 | res_hostalias(const res_state statp, const char *name, char *dst, size_t siz) { |
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453 | char *file, *cp1, *cp2; |
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454 | char buf[BUFSIZ]; |
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455 | FILE *fp; |
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456 | |
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457 | if (statp->options & RES_NOALIASES) |
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458 | return (NULL); |
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459 | if (issetugid()) |
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460 | return (NULL); |
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461 | file = getenv("HOSTALIASES"); |
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462 | if (file == NULL || (fp = fopen(file, "r")) == NULL) |
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463 | return (NULL); |
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464 | setbuf(fp, NULL); |
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465 | buf[sizeof(buf) - 1] = '\0'; |
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466 | while (fgets(buf, sizeof(buf), fp)) { |
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467 | for (cp1 = buf; *cp1 && !isspace((unsigned char)*cp1); ++cp1) |
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468 | ; |
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469 | if (!*cp1) |
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470 | break; |
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471 | *cp1 = '\0'; |
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472 | if (ns_samename(buf, name) == 1) { |
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473 | while (isspace((unsigned char)*++cp1)) |
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474 | ; |
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475 | if (!*cp1) |
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476 | break; |
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477 | for (cp2 = cp1 + 1; *cp2 && |
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478 | !isspace((unsigned char)*cp2); ++cp2) |
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479 | ; |
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480 | *cp2 = '\0'; |
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481 | strncpy(dst, cp1, siz - 1); |
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482 | dst[siz - 1] = '\0'; |
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483 | fclose(fp); |
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484 | return (dst); |
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485 | } |
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486 | } |
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487 | fclose(fp); |
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488 | return (NULL); |
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489 | } |
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490 | |
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491 | /*! \file */ |
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