1 | /*- |
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2 | * Copyright (c) 1985, 1988, 1993 |
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3 | * The Regents of the University of California. All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * 3. All advertising materials mentioning features or use of this software |
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14 | * must display the following acknowledgement: |
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15 | * This product includes software developed by the University of |
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16 | * California, Berkeley and its contributors. |
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17 | * 4. Neither the name of the University nor the names of its contributors |
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18 | * may be used to endorse or promote products derived from this software |
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19 | * without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 | * SUCH DAMAGE. |
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32 | * - |
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33 | * Portions Copyright (c) 1993 by Digital Equipment Corporation. |
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34 | * |
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35 | * Permission to use, copy, modify, and distribute this software for any |
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36 | * purpose with or without fee is hereby granted, provided that the above |
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37 | * copyright notice and this permission notice appear in all copies, and that |
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38 | * the name of Digital Equipment Corporation not be used in advertising or |
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39 | * publicity pertaining to distribution of the document or software without |
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40 | * specific, written prior permission. |
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41 | * |
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42 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
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43 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES |
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44 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT |
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45 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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46 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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47 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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48 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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49 | * SOFTWARE. |
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50 | * - |
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51 | * --Copyright-- |
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52 | */ |
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53 | |
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54 | #if HAVE_CONFIG_H |
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55 | #include "config.h" |
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56 | #endif |
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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 <stdlib.h> /* realloc, malloc, free */ |
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65 | #include <ctype.h> |
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66 | #include <errno.h> |
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67 | #include <string.h> |
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68 | #ifdef HAVE_STRINGS_H |
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69 | #include <strings.h> |
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70 | #endif |
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71 | #include <arpa/nameser.h> /* XXX */ |
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72 | #include <resolv.h> /* XXX */ |
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73 | #include <sys/fcntl.h> |
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74 | |
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75 | #define MAXALIASES 35 |
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76 | |
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77 | static struct hostent host; |
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78 | static char *host_aliases[MAXALIASES]; |
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79 | static char hostbuf[BUFSIZ+1]; |
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80 | static FILE *hostf = NULL; |
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81 | static u_char host_addr[16]; /* IPv4 or IPv6 */ |
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82 | static char *h_addr_ptrs[2]; |
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83 | static int stayopen = 0; |
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84 | |
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85 | #ifdef _THREAD_SAFE |
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86 | static char* hostmap = NULL; |
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87 | static unsigned int hostlen = 0; |
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88 | static char *cur; |
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89 | #endif |
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90 | |
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91 | void |
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92 | _sethosthtent(int f) |
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93 | { |
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94 | if (!hostf) |
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95 | hostf = fopen(_PATH_HOSTS, "r" ); |
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96 | else |
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97 | rewind(hostf); |
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98 | stayopen = f; |
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99 | } |
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100 | |
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101 | void |
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102 | _endhosthtent(void) |
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103 | { |
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104 | if (hostf && !stayopen) { |
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105 | (void) fclose(hostf); |
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106 | hostf = NULL; |
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107 | } |
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108 | } |
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109 | |
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110 | struct hostent * |
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111 | gethostent(void) |
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112 | { |
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113 | char *p; |
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114 | register char *cp, **q; |
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115 | int af, len; |
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116 | |
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117 | if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) { |
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118 | h_errno = NETDB_INTERNAL; |
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119 | return (NULL); |
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120 | } |
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121 | again: |
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122 | if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) { |
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123 | h_errno = HOST_NOT_FOUND; |
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124 | return (NULL); |
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125 | } |
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126 | if (*p == '#') |
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127 | goto again; |
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128 | if (!(cp = strpbrk(p, "#\n"))) |
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129 | goto again; |
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130 | *cp = '\0'; |
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131 | if (!(cp = strpbrk(p, " \t"))) |
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132 | goto again; |
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133 | *cp++ = '\0'; |
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134 | if (inet_pton(AF_INET6, p, host_addr) > 0) { |
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135 | af = AF_INET6; |
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136 | len = IN6ADDRSZ; |
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137 | } else if (inet_pton(AF_INET, p, host_addr) > 0) { |
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138 | if (_res.options & RES_USE_INET6) { |
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139 | _map_v4v6_address((char*)host_addr, (char*)host_addr); |
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140 | af = AF_INET6; |
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141 | len = IN6ADDRSZ; |
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142 | } else { |
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143 | af = AF_INET; |
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144 | len = INADDRSZ; |
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145 | } |
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146 | } else { |
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147 | goto again; |
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148 | } |
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149 | h_addr_ptrs[0] = (char *)host_addr; |
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150 | h_addr_ptrs[1] = NULL; |
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151 | host.h_addr_list = h_addr_ptrs; |
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152 | host.h_length = len; |
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153 | host.h_addrtype = af; |
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154 | while (*cp == ' ' || *cp == '\t') |
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155 | cp++; |
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156 | host.h_name = cp; |
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157 | q = host.h_aliases = host_aliases; |
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158 | if ((cp = strpbrk(cp, " \t")) != NULL) |
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159 | *cp++ = '\0'; |
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160 | while (cp && *cp) { |
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161 | if (*cp == ' ' || *cp == '\t') { |
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162 | cp++; |
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163 | continue; |
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164 | } |
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165 | if (q < &host_aliases[MAXALIASES - 1]) |
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166 | *q++ = cp; |
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167 | if ((cp = strpbrk(cp, " \t")) != NULL) |
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168 | *cp++ = '\0'; |
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169 | } |
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170 | *q = NULL; |
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171 | h_errno = NETDB_SUCCESS; |
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172 | return (&host); |
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173 | } |
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174 | |
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175 | struct hostent * |
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176 | _gethostbyhtname( |
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177 | const char *name, |
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178 | int af) |
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179 | { |
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180 | register struct hostent *p; |
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181 | register char **cp; |
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182 | |
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183 | sethostent(0); |
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184 | while ((p = gethostent()) != NULL) { |
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185 | if (p->h_addrtype != af) |
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186 | continue; |
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187 | if (strcasecmp(p->h_name, name) == 0) |
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188 | break; |
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189 | for (cp = p->h_aliases; *cp != 0; cp++) |
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190 | if (strcasecmp(*cp, name) == 0) |
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191 | goto found; |
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192 | } |
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193 | found: |
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194 | endhostent(); |
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195 | return (p); |
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196 | } |
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197 | |
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198 | struct hostent * |
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199 | _gethostbyhtaddr( |
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200 | const char *addr, |
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201 | int len, |
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202 | int af) |
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203 | { |
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204 | register struct hostent *p; |
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205 | |
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206 | sethostent(0); |
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207 | while ((p = gethostent()) != NULL) |
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208 | if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len)) |
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209 | break; |
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210 | endhostent(); |
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211 | return (p); |
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212 | } |
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213 | |
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214 | |
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215 | #ifdef _THREAD_SAFE |
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216 | struct hostent* gethostent_r(char* buf, int len) |
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217 | { |
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218 | char *dest; |
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219 | struct hostent* pe=(struct hostent*)buf; |
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220 | char* last; |
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221 | char* max=buf+len; |
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222 | int aliasidx; |
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223 | int curlen; |
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224 | |
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225 | |
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226 | if (!hostf) return 0; |
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227 | fseek(hostf,0,SEEK_END); |
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228 | curlen=ftell(hostf); |
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229 | fseek(hostf,0,SEEK_SET); |
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230 | |
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231 | if (curlen > hostlen) { |
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232 | if (hostmap) { |
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233 | hostmap = realloc(hostmap,curlen); |
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234 | } |
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235 | else { |
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236 | hostmap = malloc(curlen); |
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237 | } |
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238 | } |
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239 | hostlen = curlen; |
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240 | |
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241 | if (hostmap) { |
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242 | if (fread(hostmap,hostlen,1,hostf) != hostlen) { |
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243 | hostmap=0; goto error; |
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244 | } |
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245 | cur=hostmap; |
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246 | } |
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247 | last=hostmap+hostlen; |
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248 | again: |
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249 | if ((size_t)len<sizeof(struct hostent)+11*sizeof(char*)) goto nospace; |
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250 | dest=buf+sizeof(struct hostent); |
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251 | pe->h_name=0; |
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252 | pe->h_aliases=(char**)dest; pe->h_aliases[0]=0; dest+=10*sizeof(char*); |
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253 | pe->h_addr_list=(char**)dest; dest+=2*sizeof(char**); |
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254 | if (cur>=last) return 0; |
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255 | if (*cur=='#' || *cur=='\n') goto parseerror; |
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256 | /* first, the ip number */ |
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257 | pe->h_name=cur; |
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258 | while (cur<last && !isspace((unsigned char)*cur)) cur++; |
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259 | if (cur>=last) return 0; |
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260 | if (*cur=='\n') goto parseerror; |
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261 | { |
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262 | char save=*cur; |
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263 | *cur=0; |
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264 | pe->h_addr_list[0]=dest; |
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265 | pe->h_addr_list[1]=0; |
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266 | if (max-dest<16) goto nospace; |
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267 | if (inet_pton(AF_INET6,pe->h_name,dest)>0) { |
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268 | pe->h_addrtype=AF_INET6; |
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269 | pe->h_length=16; |
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270 | dest+=16; |
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271 | } else if (inet_pton(AF_INET,pe->h_name,dest)>0) { |
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272 | pe->h_addrtype=AF_INET; |
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273 | pe->h_length=4; |
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274 | dest+=4; |
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275 | } else { |
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276 | *cur=save; |
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277 | goto parseerror; |
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278 | } |
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279 | *cur=save; |
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280 | } |
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281 | ++cur; |
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282 | /* now the aliases */ |
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283 | for (aliasidx=0;aliasidx<9;++aliasidx) { |
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284 | while (cur<last && isblank((unsigned char)*cur)) ++cur; |
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285 | pe->h_aliases[aliasidx]=cur; |
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286 | while (cur<last && !isspace((unsigned char)*cur)) ++cur; |
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287 | { |
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288 | char *from=pe->h_aliases[aliasidx]; |
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289 | int len=cur-from; |
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290 | if (max-dest<len+2) goto nospace; |
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291 | pe->h_aliases[aliasidx]=dest; |
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292 | memmove(dest,from,(size_t)(cur-from)); |
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293 | dest+=len; |
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294 | *dest=0; ++dest; |
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295 | } |
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296 | if (*cur=='\n') { ++cur; ++aliasidx; break; } |
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297 | if (cur>=last || !isblank((unsigned char)*cur)) break; |
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298 | cur++; |
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299 | } |
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300 | pe->h_aliases[aliasidx]=0; |
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301 | pe->h_name=pe->h_aliases[0]; |
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302 | pe->h_aliases++; |
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303 | return pe; |
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304 | parseerror: |
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305 | while (cur<last && *cur!='\n') cur++; |
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306 | cur++; |
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307 | goto again; |
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308 | nospace: |
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309 | errno=ERANGE; |
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310 | goto __error; |
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311 | error: |
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312 | errno=ENOMEM; |
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313 | __error: |
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314 | if (hostmap!=NULL) free(hostmap); |
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315 | hostmap=NULL; |
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316 | return 0; |
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317 | } |
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318 | #endif |
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