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 | * 4. Neither the name of the University nor the names of its contributors |
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14 | * may be used to endorse or promote products derived from this software |
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15 | * without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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27 | * SUCH DAMAGE. |
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28 | */ |
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29 | |
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30 | /* |
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31 | * Portions Copyright (c) 1993 by Digital Equipment Corporation. |
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32 | * |
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33 | * Permission to use, copy, modify, and distribute this software for any |
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34 | * purpose with or without fee is hereby granted, provided that the above |
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35 | * copyright notice and this permission notice appear in all copies, and that |
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36 | * the name of Digital Equipment Corporation not be used in advertising or |
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37 | * publicity pertaining to distribution of the document or software without |
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38 | * specific, written prior permission. |
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39 | * |
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40 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
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41 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES |
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42 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT |
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43 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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44 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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45 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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46 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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47 | * SOFTWARE. |
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48 | */ |
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49 | |
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50 | /* |
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51 | * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") |
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52 | * Portions Copyright (c) 1996-1999 by Internet Software Consortium. |
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53 | * |
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54 | * Permission to use, copy, modify, and distribute this software for any |
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55 | * purpose with or without fee is hereby granted, provided that the above |
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56 | * copyright notice and this permission notice appear in all copies. |
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57 | * |
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58 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
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59 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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60 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR |
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61 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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62 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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63 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
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64 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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65 | */ |
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66 | |
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67 | #if defined(LIBC_SCCS) && !defined(lint) |
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68 | static const char sccsid[] = "@(#)res_mkquery.c 8.1 (Berkeley) 6/4/93"; |
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69 | static const char rcsid[] = "$Id: res_mkquery.c,v 1.5.18.2 2008/04/03 23:15:15 marka Exp $"; |
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70 | #endif /* LIBC_SCCS and not lint */ |
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71 | #include <sys/cdefs.h> |
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72 | __FBSDID("$FreeBSD$"); |
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73 | |
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74 | #include "port_before.h" |
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75 | #include <rtems/bsd/sys/types.h> |
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76 | #include <rtems/bsd/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 <netdb.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 "port_after.h" |
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84 | |
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85 | /* Options. Leave them on. */ |
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86 | #define DEBUG |
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87 | |
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88 | extern const char *_res_opcodes[]; |
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89 | |
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90 | /*% |
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91 | * Form all types of queries. |
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92 | * Returns the size of the result or -1. |
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93 | */ |
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94 | int |
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95 | res_nmkquery(res_state statp, |
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96 | int op, /*!< opcode of query */ |
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97 | const char *dname, /*!< domain name */ |
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98 | int class, int type, /*!< class and type of query */ |
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99 | const u_char *data, /*!< resource record data */ |
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100 | int datalen, /*!< length of data */ |
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101 | const u_char *newrr_in, /*!< new rr for modify or append */ |
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102 | u_char *buf, /*!< buffer to put query */ |
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103 | int buflen) /*!< size of buffer */ |
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104 | { |
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105 | HEADER *hp; |
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106 | u_char *cp, *ep; |
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107 | int n; |
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108 | u_char *dnptrs[20], **dpp, **lastdnptr; |
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109 | |
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110 | UNUSED(newrr_in); |
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111 | |
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112 | #ifdef DEBUG |
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113 | if (statp->options & RES_DEBUG) |
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114 | printf(";; res_nmkquery(%s, %s, %s, %s)\n", |
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115 | _res_opcodes[op], dname, p_class(class), p_type(type)); |
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116 | #endif |
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117 | /* |
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118 | * Initialize header fields. |
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119 | */ |
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120 | if ((buf == NULL) || (buflen < HFIXEDSZ)) |
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121 | return (-1); |
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122 | memset(buf, 0, HFIXEDSZ); |
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123 | hp = (HEADER *) buf; |
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124 | hp->id = htons(++statp->id); |
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125 | hp->opcode = op; |
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126 | hp->rd = (statp->options & RES_RECURSE) != 0U; |
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127 | hp->rcode = NOERROR; |
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128 | cp = buf + HFIXEDSZ; |
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129 | ep = buf + buflen; |
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130 | dpp = dnptrs; |
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131 | *dpp++ = buf; |
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132 | *dpp++ = NULL; |
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133 | lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0]; |
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134 | /* |
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135 | * perform opcode specific processing |
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136 | */ |
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137 | switch (op) { |
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138 | case QUERY: /*FALLTHROUGH*/ |
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139 | case NS_NOTIFY_OP: |
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140 | if (ep - cp < QFIXEDSZ) |
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141 | return (-1); |
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142 | if ((n = dn_comp(dname, cp, ep - cp - QFIXEDSZ, dnptrs, |
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143 | lastdnptr)) < 0) |
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144 | return (-1); |
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145 | cp += n; |
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146 | ns_put16(type, cp); |
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147 | cp += INT16SZ; |
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148 | ns_put16(class, cp); |
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149 | cp += INT16SZ; |
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150 | hp->qdcount = htons(1); |
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151 | if (op == QUERY || data == NULL) |
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152 | break; |
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153 | /* |
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154 | * Make an additional record for completion domain. |
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155 | */ |
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156 | if ((ep - cp) < RRFIXEDSZ) |
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157 | return (-1); |
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158 | n = dn_comp((const char *)data, cp, ep - cp - RRFIXEDSZ, |
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159 | dnptrs, lastdnptr); |
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160 | if (n < 0) |
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161 | return (-1); |
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162 | cp += n; |
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163 | ns_put16(T_NULL, cp); |
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164 | cp += INT16SZ; |
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165 | ns_put16(class, cp); |
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166 | cp += INT16SZ; |
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167 | ns_put32(0, cp); |
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168 | cp += INT32SZ; |
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169 | ns_put16(0, cp); |
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170 | cp += INT16SZ; |
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171 | hp->arcount = htons(1); |
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172 | break; |
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173 | |
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174 | case IQUERY: |
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175 | /* |
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176 | * Initialize answer section |
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177 | */ |
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178 | if (ep - cp < 1 + RRFIXEDSZ + datalen) |
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179 | return (-1); |
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180 | *cp++ = '\0'; /*%< no domain name */ |
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181 | ns_put16(type, cp); |
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182 | cp += INT16SZ; |
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183 | ns_put16(class, cp); |
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184 | cp += INT16SZ; |
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185 | ns_put32(0, cp); |
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186 | cp += INT32SZ; |
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187 | ns_put16(datalen, cp); |
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188 | cp += INT16SZ; |
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189 | if (datalen) { |
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190 | memcpy(cp, data, datalen); |
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191 | cp += datalen; |
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192 | } |
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193 | hp->ancount = htons(1); |
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194 | break; |
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195 | |
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196 | default: |
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197 | return (-1); |
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198 | } |
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199 | return (cp - buf); |
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200 | } |
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201 | |
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202 | #ifdef RES_USE_EDNS0 |
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203 | /* attach OPT pseudo-RR, as documented in RFC2671 (EDNS0). */ |
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204 | |
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205 | int |
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206 | res_nopt(res_state statp, |
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207 | int n0, /*%< current offset in buffer */ |
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208 | u_char *buf, /*%< buffer to put query */ |
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209 | int buflen, /*%< size of buffer */ |
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210 | int anslen) /*%< UDP answer buffer size */ |
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211 | { |
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212 | HEADER *hp; |
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213 | u_char *cp, *ep; |
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214 | u_int16_t flags = 0; |
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215 | |
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216 | #ifdef DEBUG |
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217 | if ((statp->options & RES_DEBUG) != 0U) |
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218 | printf(";; res_nopt()\n"); |
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219 | #endif |
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220 | |
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221 | hp = (HEADER *) buf; |
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222 | cp = buf + n0; |
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223 | ep = buf + buflen; |
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224 | |
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225 | if ((ep - cp) < 1 + RRFIXEDSZ) |
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226 | return (-1); |
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227 | |
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228 | *cp++ = 0; /*%< "." */ |
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229 | ns_put16(ns_t_opt, cp); /*%< TYPE */ |
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230 | cp += INT16SZ; |
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231 | if (anslen > 0xffff) |
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232 | anslen = 0xffff; /* limit to 16bit value */ |
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233 | ns_put16(anslen & 0xffff, cp); /*%< CLASS = UDP payload size */ |
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234 | cp += INT16SZ; |
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235 | *cp++ = NOERROR; /*%< extended RCODE */ |
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236 | *cp++ = 0; /*%< EDNS version */ |
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237 | |
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238 | if (statp->options & RES_USE_DNSSEC) { |
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239 | #ifdef DEBUG |
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240 | if (statp->options & RES_DEBUG) |
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241 | printf(";; res_opt()... ENDS0 DNSSEC\n"); |
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242 | #endif |
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243 | flags |= NS_OPT_DNSSEC_OK; |
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244 | } |
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245 | ns_put16(flags, cp); |
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246 | cp += INT16SZ; |
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247 | |
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248 | ns_put16(0U, cp); /*%< RDLEN */ |
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249 | cp += INT16SZ; |
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250 | |
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251 | hp->arcount = htons(ntohs(hp->arcount) + 1); |
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252 | |
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253 | return (cp - buf); |
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254 | } |
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255 | |
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256 | /* |
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257 | * Construct variable data (RDATA) block for OPT psuedo-RR, append it |
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258 | * to the buffer, then update the RDLEN field (previously set to zero by |
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259 | * res_nopt()) with the new RDATA length. |
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260 | */ |
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261 | int |
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262 | res_nopt_rdata(res_state statp, |
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263 | int n0, /*%< current offset in buffer */ |
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264 | u_char *buf, /*%< buffer to put query */ |
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265 | int buflen, /*%< size of buffer */ |
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266 | u_char *rdata, /*%< ptr to start of opt rdata */ |
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267 | u_short code, /*%< OPTION-CODE */ |
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268 | u_short len, /*%< OPTION-LENGTH */ |
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269 | u_char *data) /*%< OPTION_DATA */ |
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270 | { |
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271 | register u_char *cp, *ep; |
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272 | |
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273 | #ifdef DEBUG |
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274 | if ((statp->options & RES_DEBUG) != 0U) |
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275 | printf(";; res_nopt_rdata()\n"); |
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276 | #endif |
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277 | |
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278 | cp = buf + n0; |
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279 | ep = buf + buflen; |
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280 | |
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281 | if ((ep - cp) < (4 + len)) |
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282 | return (-1); |
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283 | |
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284 | if (rdata < (buf + 2) || rdata >= ep) |
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285 | return (-1); |
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286 | |
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287 | ns_put16(code, cp); |
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288 | cp += INT16SZ; |
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289 | |
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290 | ns_put16(len, cp); |
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291 | cp += INT16SZ; |
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292 | |
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293 | memcpy(cp, data, len); |
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294 | cp += len; |
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295 | |
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296 | len = cp - rdata; |
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297 | ns_put16(len, rdata - 2); /* Update RDLEN field */ |
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298 | |
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299 | return (cp - buf); |
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300 | } |
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301 | #endif |
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302 | |
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303 | /*! \file */ |
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