1 | #include "port_before.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 | |
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52 | #if defined(LIBC_SCCS) && !defined(lint) |
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53 | static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; |
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54 | #endif /* LIBC_SCCS and not lint */ |
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55 | #include <sys/cdefs.h> |
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56 | __FBSDID("$FreeBSD$"); |
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57 | |
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58 | #include <sys/param.h> |
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59 | #include <sys/socket.h> |
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60 | #include <netinet/in.h> |
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61 | #include <arpa/inet.h> |
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62 | #include <netdb.h> |
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63 | #include <stdio.h> |
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64 | #include <ctype.h> |
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65 | #include <errno.h> |
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66 | #include <string.h> |
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67 | #include <stdarg.h> |
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68 | #include <nsswitch.h> |
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69 | #include <arpa/nameser.h> /* XXX */ |
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70 | #include <resolv.h> /* XXX */ |
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71 | #include "netdb_private.h" |
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72 | |
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73 | void |
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74 | _sethosthtent(int f, struct hostent_data *hed) |
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75 | { |
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76 | if (!hed->hostf) |
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77 | hed->hostf = fopen(_PATH_HOSTS, "r"); |
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78 | else |
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79 | rewind(hed->hostf); |
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80 | hed->stayopen = f; |
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81 | } |
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82 | |
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83 | void |
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84 | _endhosthtent(struct hostent_data *hed) |
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85 | { |
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86 | if (hed->hostf && !hed->stayopen) { |
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87 | (void) fclose(hed->hostf); |
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88 | hed->hostf = NULL; |
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89 | } |
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90 | } |
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91 | |
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92 | static int |
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93 | gethostent_p(struct hostent *he, struct hostent_data *hed, int mapped, |
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94 | res_state statp) |
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95 | { |
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96 | char *p, *bp, *ep; |
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97 | char *cp, **q; |
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98 | int af, len; |
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99 | char hostbuf[BUFSIZ + 1]; |
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100 | |
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101 | if (!hed->hostf && !(hed->hostf = fopen(_PATH_HOSTS, "r"))) { |
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102 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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103 | return (-1); |
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104 | } |
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105 | again: |
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106 | if (!(p = fgets(hostbuf, sizeof hostbuf, hed->hostf))) { |
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107 | RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); |
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108 | return (-1); |
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109 | } |
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110 | if (*p == '#') |
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111 | goto again; |
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112 | cp = strpbrk(p, "#\n"); |
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113 | if (cp != NULL) |
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114 | *cp = '\0'; |
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115 | if (!(cp = strpbrk(p, " \t"))) |
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116 | goto again; |
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117 | *cp++ = '\0'; |
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118 | #ifdef INET6 |
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119 | if (inet_pton(AF_INET6, p, hed->host_addr) > 0) { |
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120 | af = AF_INET6; |
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121 | len = IN6ADDRSZ; |
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122 | } else if (inet_pton(AF_INET, p, hed->host_addr) > 0) { |
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123 | if (mapped) { |
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124 | _map_v4v6_address((char *)hed->host_addr, |
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125 | (char *)hed->host_addr); |
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126 | af = AF_INET6; |
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127 | len = IN6ADDRSZ; |
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128 | } else { |
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129 | af = AF_INET; |
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130 | len = INADDRSZ; |
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131 | } |
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132 | } else { |
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133 | goto again; |
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134 | } |
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135 | #else |
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136 | if (inet_pton(AF_INET, p, hed->host_addr) > 0) { |
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137 | af = AF_INET; |
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138 | len = INADDRSZ; |
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139 | } |
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140 | #endif |
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141 | hed->h_addr_ptrs[0] = (char *)hed->host_addr; |
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142 | hed->h_addr_ptrs[1] = NULL; |
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143 | he->h_addr_list = hed->h_addr_ptrs; |
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144 | he->h_length = len; |
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145 | he->h_addrtype = af; |
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146 | while (*cp == ' ' || *cp == '\t') |
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147 | cp++; |
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148 | bp = hed->hostbuf; |
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149 | ep = hed->hostbuf + sizeof hed->hostbuf; |
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150 | he->h_name = bp; |
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151 | q = he->h_aliases = hed->host_aliases; |
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152 | if ((p = strpbrk(cp, " \t")) != NULL) |
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153 | *p++ = '\0'; |
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154 | len = strlen(cp) + 1; |
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155 | if (ep - bp < len) { |
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156 | RES_SET_H_ERRNO(statp, NO_RECOVERY); |
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157 | return (-1); |
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158 | } |
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159 | strlcpy(bp, cp, ep - bp); |
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160 | bp += len; |
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161 | cp = p; |
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162 | while (cp && *cp) { |
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163 | if (*cp == ' ' || *cp == '\t') { |
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164 | cp++; |
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165 | continue; |
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166 | } |
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167 | if (q >= &hed->host_aliases[_MAXALIASES - 1]) |
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168 | break; |
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169 | if ((p = strpbrk(cp, " \t")) != NULL) |
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170 | *p++ = '\0'; |
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171 | len = strlen(cp) + 1; |
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172 | if (ep - bp < len) |
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173 | break; |
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174 | strlcpy(bp, cp, ep - bp); |
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175 | *q++ = bp; |
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176 | bp += len; |
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177 | cp = p; |
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178 | } |
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179 | *q = NULL; |
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180 | RES_SET_H_ERRNO(statp, NETDB_SUCCESS); |
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181 | return (0); |
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182 | } |
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183 | |
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184 | int |
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185 | gethostent_r(struct hostent *hptr, char *buffer, size_t buflen, |
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186 | struct hostent **result, int *h_errnop) |
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187 | { |
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188 | struct hostent_data *hed; |
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189 | struct hostent he; |
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190 | res_state statp; |
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191 | |
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192 | statp = __res_state(); |
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193 | if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) { |
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194 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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195 | *h_errnop = statp->res_h_errno; |
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196 | return (-1); |
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197 | } |
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198 | if ((hed = __hostent_data_init()) == NULL) { |
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199 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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200 | *h_errnop = statp->res_h_errno; |
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201 | return (-1); |
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202 | } |
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203 | #ifdef INET6 |
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204 | if (gethostent_p(&he, hed, statp->options & RES_USE_INET6, statp) != 0) |
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205 | return (-1); |
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206 | #endif |
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207 | if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { |
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208 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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209 | *h_errnop = statp->res_h_errno; |
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210 | return ((errno != 0) ? errno : -1); |
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211 | } |
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212 | *result = hptr; |
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213 | return (0); |
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214 | } |
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215 | |
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216 | struct hostent * |
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217 | gethostent(void) |
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218 | { |
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219 | struct hostdata *hd; |
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220 | struct hostent *rval; |
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221 | int ret_h_errno; |
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222 | |
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223 | if ((hd = __hostdata_init()) == NULL) |
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224 | return (NULL); |
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225 | if (gethostent_r(&hd->host, hd->data, sizeof(hd->data), &rval, |
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226 | &ret_h_errno) != 0) |
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227 | return (NULL); |
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228 | return (rval); |
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229 | } |
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230 | |
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231 | int |
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232 | _ht_gethostbyname(void *rval, void *cb_data, va_list ap) |
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233 | { |
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234 | const char *name; |
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235 | int af; |
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236 | char *buffer; |
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237 | size_t buflen; |
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238 | int *errnop, *h_errnop; |
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239 | struct hostent *hptr, he; |
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240 | struct hostent_data *hed; |
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241 | char **cp; |
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242 | res_state statp; |
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243 | int error; |
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244 | |
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245 | name = va_arg(ap, const char *); |
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246 | af = va_arg(ap, int); |
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247 | hptr = va_arg(ap, struct hostent *); |
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248 | buffer = va_arg(ap, char *); |
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249 | buflen = va_arg(ap, size_t); |
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250 | errnop = va_arg(ap, int *); |
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251 | h_errnop = va_arg(ap, int *); |
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252 | |
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253 | *((struct hostent **)rval) = NULL; |
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254 | |
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255 | statp = __res_state(); |
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256 | if ((hed = __hostent_data_init()) == NULL) { |
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257 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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258 | *h_errnop = statp->res_h_errno; |
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259 | return (NS_NOTFOUND); |
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260 | } |
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261 | |
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262 | _sethosthtent(0, hed); |
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263 | while ((error = gethostent_p(&he, hed, 0, statp)) == 0) { |
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264 | if (he.h_addrtype != af) |
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265 | continue; |
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266 | #ifdef INET6 |
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267 | if (he.h_addrtype == AF_INET && |
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268 | statp->options & RES_USE_INET6) { |
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269 | _map_v4v6_address(he.h_addr, he.h_addr); |
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270 | he.h_length = IN6ADDRSZ; |
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271 | he.h_addrtype = AF_INET6; |
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272 | } |
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273 | #endif |
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274 | if (strcasecmp(he.h_name, name) == 0) |
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275 | break; |
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276 | for (cp = he.h_aliases; *cp != 0; cp++) |
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277 | if (strcasecmp(*cp, name) == 0) |
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278 | goto found; |
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279 | } |
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280 | found: |
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281 | _endhosthtent(hed); |
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282 | |
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283 | if (error != 0) { |
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284 | *h_errnop = statp->res_h_errno; |
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285 | return (NS_NOTFOUND); |
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286 | } |
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287 | if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { |
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288 | *errnop = errno; |
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289 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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290 | *h_errnop = statp->res_h_errno; |
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291 | return (NS_RETURN); |
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292 | } |
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293 | *((struct hostent **)rval) = hptr; |
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294 | return (NS_SUCCESS); |
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295 | } |
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296 | |
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297 | int |
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298 | _ht_gethostbyaddr(void *rval, void *cb_data, va_list ap) |
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299 | { |
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300 | const void *addr; |
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301 | socklen_t len; |
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302 | int af; |
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303 | char *buffer; |
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304 | size_t buflen; |
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305 | int *errnop, *h_errnop; |
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306 | struct hostent *hptr, he; |
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307 | struct hostent_data *hed; |
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308 | res_state statp; |
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309 | int error; |
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310 | |
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311 | addr = va_arg(ap, const void *); |
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312 | len = va_arg(ap, socklen_t); |
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313 | af = va_arg(ap, int); |
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314 | hptr = va_arg(ap, struct hostent *); |
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315 | buffer = va_arg(ap, char *); |
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316 | buflen = va_arg(ap, size_t); |
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317 | errnop = va_arg(ap, int *); |
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318 | h_errnop = va_arg(ap, int *); |
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319 | |
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320 | *((struct hostent **)rval) = NULL; |
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321 | |
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322 | statp = __res_state(); |
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323 | if ((hed = __hostent_data_init()) == NULL) { |
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324 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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325 | *h_errnop = statp->res_h_errno; |
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326 | return (NS_NOTFOUND); |
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327 | } |
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328 | |
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329 | _sethosthtent(0, hed); |
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330 | while ((error = gethostent_p(&he, hed, 0, statp)) == 0) |
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331 | #ifdef INET6 |
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332 | if (he.h_addrtype == af && !bcmp(he.h_addr, addr, len)) { |
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333 | if (he.h_addrtype == AF_INET && |
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334 | statp->options & RES_USE_INET6) { |
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335 | _map_v4v6_address(he.h_addr, he.h_addr); |
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336 | he.h_length = IN6ADDRSZ; |
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337 | he.h_addrtype = AF_INET6; |
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338 | } |
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339 | break; |
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340 | } |
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341 | #endif |
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342 | _endhosthtent(hed); |
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343 | |
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344 | if (error != 0) |
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345 | return (NS_NOTFOUND); |
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346 | if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { |
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347 | *errnop = errno; |
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348 | RES_SET_H_ERRNO(statp, NETDB_INTERNAL); |
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349 | *h_errnop = statp->res_h_errno; |
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350 | return (NS_RETURN); |
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351 | } |
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352 | *((struct hostent **)rval) = hptr; |
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353 | return (NS_SUCCESS); |
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354 | } |
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