1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /*- |
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4 | * Copyright (c) 1985, 1988, 1993 |
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5 | * The Regents of the University of California. All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions |
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9 | * are met: |
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10 | * 1. Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * 4. Neither the name of the University nor the names of its contributors |
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16 | * may be used to endorse or promote products derived from this software |
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17 | * without specific prior written permission. |
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18 | * |
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19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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29 | * SUCH DAMAGE. |
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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 | * --Copyright-- |
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50 | */ |
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51 | /* Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro |
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52 | * Dep. Matematica Universidade de Coimbra, Portugal, Europe |
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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 | |
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59 | #if defined(LIBC_SCCS) && !defined(lint) |
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60 | static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; |
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61 | #endif /* LIBC_SCCS and not lint */ |
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62 | #include <sys/cdefs.h> |
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63 | __FBSDID("$FreeBSD$"); |
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64 | |
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65 | #include <rtems/bsd/sys/param.h> |
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66 | #include <sys/socket.h> |
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67 | #include <netinet/in.h> |
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68 | #include <arpa/inet.h> |
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69 | #include <arpa/nameser.h> |
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70 | |
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71 | #include <errno.h> |
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72 | #include <stdio.h> |
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73 | #include <stdlib.h> |
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74 | #include <netdb.h> |
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75 | #include <resolv.h> |
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76 | #include <ctype.h> |
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77 | #include <string.h> |
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78 | #include <unistd.h> |
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79 | #include <syslog.h> |
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80 | #include <stdarg.h> |
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81 | #include <nsswitch.h> |
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82 | |
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83 | #include "netdb_private.h" |
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84 | #include "res_config.h" |
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85 | |
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86 | #define BYADDR 0 |
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87 | #define BYNAME 1 |
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88 | |
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89 | #define MAXPACKET (64*1024) |
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90 | |
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91 | typedef union { |
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92 | HEADER hdr; |
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93 | u_char buf[MAXPACKET]; |
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94 | } querybuf; |
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95 | |
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96 | typedef union { |
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97 | long al; |
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98 | char ac; |
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99 | } align; |
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100 | |
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101 | /* |
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102 | * Reverse the order of first four dotted entries of in. |
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103 | * Out must contain space for at least strlen(in) characters. |
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104 | * The result does not include any leading 0s of in. |
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105 | */ |
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106 | static void |
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107 | ipreverse(char *in, char *out) |
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108 | { |
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109 | char *pos[4]; |
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110 | int len[4]; |
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111 | char *p, *start; |
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112 | int i = 0; |
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113 | int leading = 1; |
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114 | |
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115 | /* Fill-in element positions and lengths: pos[], len[]. */ |
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116 | start = p = in; |
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117 | for (;;) { |
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118 | if (*p == '.' || *p == '\0') { |
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119 | /* Leading 0? */ |
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120 | if (leading && p - start == 1 && *start == '0') |
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121 | len[i] = 0; |
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122 | else { |
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123 | len[i] = p - start; |
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124 | leading = 0; |
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125 | } |
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126 | pos[i] = start; |
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127 | start = p + 1; |
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128 | i++; |
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129 | } |
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130 | if (i == 4) |
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131 | break; |
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132 | if (*p == 0) { |
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133 | for (; i < 4; i++) { |
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134 | pos[i] = p; |
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135 | len[i] = 0; |
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136 | } |
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137 | break; |
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138 | } |
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139 | p++; |
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140 | } |
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141 | |
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142 | /* Copy the entries in reverse order */ |
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143 | p = out; |
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144 | leading = 1; |
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145 | for (i = 3; i >= 0; i--) { |
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146 | memcpy(p, pos[i], len[i]); |
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147 | if (len[i]) |
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148 | leading = 0; |
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149 | p += len[i]; |
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150 | /* Need a . separator? */ |
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151 | if (!leading && i > 0 && len[i - 1]) |
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152 | *p++ = '.'; |
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153 | } |
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154 | *p = '\0'; |
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155 | } |
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156 | |
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157 | static int |
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158 | getnetanswer(querybuf *answer, int anslen, int net_i, struct netent *ne, |
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159 | struct netent_data *ned, res_state statp) |
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160 | { |
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161 | |
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162 | HEADER *hp; |
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163 | u_char *cp; |
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164 | int n; |
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165 | u_char *eom; |
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166 | int type, class, ancount, qdcount, haveanswer; |
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167 | char aux[MAXHOSTNAMELEN]; |
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168 | char ans[MAXHOSTNAMELEN]; |
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169 | char *in, *bp, *ep, **ap; |
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170 | |
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171 | /* |
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172 | * find first satisfactory answer |
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173 | * |
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174 | * answer --> +------------+ ( MESSAGE ) |
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175 | * | Header | |
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176 | * +------------+ |
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177 | * | Question | the question for the name server |
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178 | * +------------+ |
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179 | * | Answer | RRs answering the question |
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180 | * +------------+ |
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181 | * | Authority | RRs pointing toward an authority |
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182 | * | Additional | RRs holding additional information |
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183 | * +------------+ |
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184 | */ |
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185 | eom = answer->buf + anslen; |
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186 | hp = &answer->hdr; |
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187 | ancount = ntohs(hp->ancount); /* #/records in the answer section */ |
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188 | qdcount = ntohs(hp->qdcount); /* #/entries in the question section */ |
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189 | bp = ned->netbuf; |
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190 | ep = ned->netbuf + sizeof(ned->netbuf); |
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191 | cp = answer->buf + HFIXEDSZ; |
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192 | if (!qdcount) { |
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193 | if (hp->aa) |
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194 | RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); |
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195 | else |
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196 | RES_SET_H_ERRNO(statp, TRY_AGAIN); |
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197 | return (-1); |
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198 | } |
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199 | while (qdcount-- > 0) |
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200 | cp += __dn_skipname(cp, eom) + QFIXEDSZ; |
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201 | ap = ned->net_aliases; |
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202 | *ap = NULL; |
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203 | ne->n_aliases = ned->net_aliases; |
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204 | haveanswer = 0; |
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205 | while (--ancount >= 0 && cp < eom) { |
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206 | n = dn_expand(answer->buf, eom, cp, bp, ep - bp); |
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207 | if ((n < 0) || !res_dnok(bp)) |
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208 | break; |
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209 | cp += n; |
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210 | ans[0] = '\0'; |
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211 | (void)strncpy(&ans[0], bp, sizeof(ans) - 1); |
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212 | ans[sizeof(ans) - 1] = '\0'; |
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213 | GETSHORT(type, cp); |
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214 | GETSHORT(class, cp); |
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215 | cp += INT32SZ; /* TTL */ |
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216 | GETSHORT(n, cp); |
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217 | if (class == C_IN && type == T_PTR) { |
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218 | n = dn_expand(answer->buf, eom, cp, bp, ep - bp); |
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219 | if ((n < 0) || !res_hnok(bp)) { |
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220 | cp += n; |
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221 | return (-1); |
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222 | } |
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223 | cp += n; |
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224 | *ap++ = bp; |
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225 | n = strlen(bp) + 1; |
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226 | bp += n; |
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227 | ne->n_addrtype = (class == C_IN) ? AF_INET : AF_UNSPEC; |
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228 | haveanswer++; |
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229 | } |
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230 | } |
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231 | if (haveanswer) { |
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232 | *ap = NULL; |
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233 | switch (net_i) { |
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234 | case BYADDR: |
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235 | ne->n_name = *ne->n_aliases; |
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236 | ne->n_net = 0L; |
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237 | break; |
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238 | case BYNAME: |
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239 | in = *ne->n_aliases; |
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240 | n = strlen(ans) + 1; |
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241 | if (ep - bp < n) { |
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242 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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243 | errno = ENOBUFS; |
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244 | return (-1); |
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245 | } |
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246 | strlcpy(bp, ans, ep - bp); |
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247 | ne->n_name = bp; |
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248 | if (strlen(in) + 1 > sizeof(aux)) { |
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249 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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250 | errno = ENOBUFS; |
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251 | return (-1); |
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252 | } |
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253 | ipreverse(in, aux); |
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254 | ne->n_net = inet_network(aux); |
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255 | break; |
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256 | } |
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257 | ne->n_aliases++; |
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258 | return (0); |
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259 | } |
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260 | RES_SET_H_ERRNO(statp, TRY_AGAIN); |
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261 | return (-1); |
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262 | } |
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263 | |
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264 | int |
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265 | _dns_getnetbyaddr(void *rval, void *cb_data, va_list ap) |
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266 | { |
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267 | uint32_t net; |
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268 | int net_type; |
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269 | char *buffer; |
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270 | size_t buflen; |
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271 | int *errnop, *h_errnop; |
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272 | struct netent *nptr, ne; |
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273 | struct netent_data *ned; |
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274 | unsigned int netbr[4]; |
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275 | int nn, anslen, error; |
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276 | querybuf *buf; |
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277 | char qbuf[MAXDNAME]; |
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278 | uint32_t net2; |
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279 | res_state statp; |
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280 | |
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281 | net = va_arg(ap, uint32_t); |
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282 | net_type = va_arg(ap, int); |
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283 | nptr = va_arg(ap, struct netent *); |
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284 | buffer = va_arg(ap, char *); |
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285 | buflen = va_arg(ap, size_t); |
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286 | errnop = va_arg(ap, int *); |
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287 | h_errnop = va_arg(ap, int *); |
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288 | |
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289 | statp = __res_state(); |
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290 | if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) { |
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291 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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292 | *h_errnop = statp->res_h_errno; |
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293 | return (NS_UNAVAIL); |
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294 | } |
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295 | |
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296 | if ((ned = __netent_data_init()) == NULL) { |
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297 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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298 | *h_errnop = statp->res_h_errno; |
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299 | return (NS_UNAVAIL); |
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300 | } |
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301 | |
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302 | *((struct netent **)rval) = NULL; |
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303 | |
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304 | if (net_type != AF_INET) { |
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305 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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306 | *h_errnop = statp->res_h_errno; |
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307 | return (NS_UNAVAIL); |
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308 | } |
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309 | |
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310 | for (nn = 4, net2 = net; net2; net2 >>= 8) |
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311 | netbr[--nn] = net2 & 0xff; |
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312 | switch (nn) { |
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313 | case 3: /* Class A */ |
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314 | sprintf(qbuf, "0.0.0.%u.in-addr.arpa", netbr[3]); |
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315 | break; |
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316 | case 2: /* Class B */ |
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317 | sprintf(qbuf, "0.0.%u.%u.in-addr.arpa", netbr[3], netbr[2]); |
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318 | break; |
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319 | case 1: /* Class C */ |
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320 | sprintf(qbuf, "0.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2], |
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321 | netbr[1]); |
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322 | break; |
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323 | case 0: /* Class D - E */ |
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324 | sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2], |
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325 | netbr[1], netbr[0]); |
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326 | break; |
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327 | } |
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328 | if ((buf = malloc(sizeof(*buf))) == NULL) { |
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329 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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330 | *h_errnop = statp->res_h_errno; |
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331 | return (NS_NOTFOUND); |
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332 | } |
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333 | anslen = res_nquery(statp, qbuf, C_IN, T_PTR, (u_char *)buf, |
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334 | sizeof(*buf)); |
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335 | if (anslen < 0) { |
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336 | free(buf); |
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337 | #ifdef DEBUG |
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338 | if (statp->options & RES_DEBUG) |
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339 | printf("res_nsearch failed\n"); |
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340 | #endif |
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341 | *h_errnop = statp->res_h_errno; |
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342 | return (NS_UNAVAIL); |
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343 | } else if (anslen > sizeof(*buf)) { |
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344 | free(buf); |
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345 | #ifdef DEBUG |
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346 | if (statp->options & RES_DEBUG) |
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347 | printf("res_nsearch static buffer too small\n"); |
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348 | #endif |
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349 | *h_errnop = statp->res_h_errno; |
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350 | return (NS_UNAVAIL); |
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351 | } |
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352 | error = getnetanswer(buf, anslen, BYADDR, &ne, ned, statp); |
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353 | free(buf); |
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354 | if (error == 0) { |
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355 | /* Strip trailing zeros */ |
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356 | while ((net & 0xff) == 0 && net != 0) |
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357 | net >>= 8; |
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358 | ne.n_net = net; |
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359 | if (__copy_netent(&ne, nptr, buffer, buflen) != 0) { |
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360 | *errnop = errno; |
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361 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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362 | *h_errnop = statp->res_h_errno; |
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363 | return (NS_RETURN); |
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364 | } |
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365 | *((struct netent **)rval) = nptr; |
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366 | return (NS_SUCCESS); |
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367 | } |
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368 | *h_errnop = statp->res_h_errno; |
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369 | return (NS_NOTFOUND); |
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370 | } |
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371 | |
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372 | int |
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373 | _dns_getnetbyname(void *rval, void *cb_data, va_list ap) |
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374 | { |
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375 | const char *net; |
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376 | char *buffer; |
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377 | size_t buflen; |
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378 | int *errnop, *h_errnop; |
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379 | struct netent *nptr, ne; |
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380 | struct netent_data *ned; |
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381 | int anslen, error; |
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382 | querybuf *buf; |
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383 | char qbuf[MAXDNAME]; |
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384 | res_state statp; |
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385 | |
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386 | net = va_arg(ap, const char *); |
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387 | nptr = va_arg(ap, struct netent *); |
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388 | buffer = va_arg(ap, char *); |
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389 | buflen = va_arg(ap, size_t); |
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390 | errnop = va_arg(ap, int *); |
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391 | h_errnop = va_arg(ap, int *); |
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392 | |
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393 | statp = __res_state(); |
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394 | if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) { |
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395 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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396 | *h_errnop = statp->res_h_errno; |
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397 | return (NS_UNAVAIL); |
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398 | } |
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399 | if ((ned = __netent_data_init()) == NULL) { |
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400 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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401 | *h_errnop = statp->res_h_errno; |
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402 | return (NS_UNAVAIL); |
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403 | } |
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404 | if ((buf = malloc(sizeof(*buf))) == NULL) { |
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405 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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406 | *h_errnop = statp->res_h_errno; |
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407 | return (NS_NOTFOUND); |
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408 | } |
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409 | |
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410 | *((struct netent **)rval) = NULL; |
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411 | |
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412 | strncpy(qbuf, net, sizeof(qbuf) - 1); |
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413 | qbuf[sizeof(qbuf) - 1] = '\0'; |
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414 | anslen = res_nsearch(statp, qbuf, C_IN, T_PTR, (u_char *)buf, |
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415 | sizeof(*buf)); |
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416 | if (anslen < 0) { |
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417 | free(buf); |
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418 | #ifdef DEBUG |
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419 | if (statp->options & RES_DEBUG) |
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420 | printf("res_nsearch failed\n"); |
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421 | #endif |
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422 | return (NS_UNAVAIL); |
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423 | } else if (anslen > sizeof(*buf)) { |
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424 | free(buf); |
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425 | #ifdef DEBUG |
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426 | if (statp->options & RES_DEBUG) |
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427 | printf("res_search static buffer too small\n"); |
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428 | #endif |
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429 | return (NS_UNAVAIL); |
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430 | } |
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431 | error = getnetanswer(buf, anslen, BYNAME, &ne, ned, statp); |
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432 | free(buf); |
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433 | if (error != 0) { |
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434 | *h_errnop = statp->res_h_errno; |
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435 | return (NS_NOTFOUND); |
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436 | } |
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437 | if (__copy_netent(&ne, nptr, buffer, buflen) != 0) { |
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438 | *errnop = errno; |
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439 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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440 | *h_errnop = statp->res_h_errno; |
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441 | return (NS_RETURN); |
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442 | } |
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443 | *((struct netent **)rval) = nptr; |
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444 | return (NS_SUCCESS); |
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445 | } |
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446 | |
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447 | void |
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448 | _setnetdnsent(int stayopen) |
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449 | { |
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450 | res_state statp; |
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451 | |
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452 | statp = __res_state(); |
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453 | if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) |
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454 | return; |
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455 | if (stayopen) |
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456 | statp->options |= RES_STAYOPEN | RES_USEVC; |
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457 | } |
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458 | |
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459 | void |
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460 | _endnetdnsent() |
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461 | { |
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462 | res_state statp; |
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463 | |
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464 | statp = __res_state(); |
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465 | statp->options &= ~(RES_STAYOPEN | RES_USEVC); |
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466 | res_nclose(statp); |
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467 | } |
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