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 defined(LIBC_SCCS) && !defined(lint) |
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55 | static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; |
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56 | static char rcsid[] = "$Id$"; |
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57 | #endif /* LIBC_SCCS and not lint */ |
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58 | |
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59 | #include <sys/param.h> |
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60 | #include <sys/socket.h> |
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61 | #include <netinet/in.h> |
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62 | #include <arpa/inet.h> |
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63 | #include <netdb.h> |
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64 | #include <stdio.h> |
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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 | #include <arpa/nameser.h> /* XXX */ |
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69 | #include <resolv.h> /* XXX */ |
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70 | |
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71 | #define MAXALIASES 35 |
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72 | |
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73 | static struct hostent host; |
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74 | static char *host_aliases[MAXALIASES]; |
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75 | static char hostbuf[BUFSIZ+1]; |
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76 | static FILE *hostf = NULL; |
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77 | static u_char host_addr[16]; /* IPv4 or IPv6 */ |
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78 | static char *h_addr_ptrs[2]; |
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79 | static int stayopen = 0; |
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80 | |
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81 | void |
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82 | _sethosthtent(f) |
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83 | int f; |
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84 | { |
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85 | if (!hostf) |
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86 | hostf = fopen(_PATH_HOSTS, "r" ); |
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87 | else |
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88 | rewind(hostf); |
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89 | stayopen = f; |
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90 | } |
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91 | |
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92 | void |
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93 | _endhosthtent() |
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94 | { |
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95 | if (hostf && !stayopen) { |
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96 | (void) fclose(hostf); |
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97 | hostf = NULL; |
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98 | } |
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99 | } |
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100 | |
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101 | struct hostent * |
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102 | gethostent() |
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103 | { |
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104 | char *p; |
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105 | register char *cp, **q; |
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106 | int af, len; |
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107 | |
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108 | if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) { |
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109 | h_errno = NETDB_INTERNAL; |
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110 | return (NULL); |
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111 | } |
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112 | again: |
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113 | if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) { |
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114 | h_errno = HOST_NOT_FOUND; |
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115 | return (NULL); |
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116 | } |
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117 | if (*p == '#') |
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118 | goto again; |
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119 | if (!(cp = strpbrk(p, "#\n"))) |
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120 | goto again; |
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121 | *cp = '\0'; |
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122 | if (!(cp = strpbrk(p, " \t"))) |
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123 | goto again; |
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124 | *cp++ = '\0'; |
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125 | if (inet_pton(AF_INET6, p, host_addr) > 0) { |
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126 | af = AF_INET6; |
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127 | len = IN6ADDRSZ; |
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128 | } else if (inet_pton(AF_INET, p, host_addr) > 0) { |
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129 | if (_res.options & RES_USE_INET6) { |
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130 | _map_v4v6_address((char*)host_addr, (char*)host_addr); |
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131 | af = AF_INET6; |
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132 | len = IN6ADDRSZ; |
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133 | } else { |
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134 | af = AF_INET; |
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135 | len = INADDRSZ; |
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136 | } |
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137 | } else { |
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138 | goto again; |
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139 | } |
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140 | h_addr_ptrs[0] = (char *)host_addr; |
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141 | h_addr_ptrs[1] = NULL; |
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142 | host.h_addr_list = h_addr_ptrs; |
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143 | host.h_length = len; |
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144 | host.h_addrtype = af; |
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145 | while (*cp == ' ' || *cp == '\t') |
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146 | cp++; |
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147 | host.h_name = cp; |
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148 | q = host.h_aliases = host_aliases; |
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149 | if ((cp = strpbrk(cp, " \t")) != NULL) |
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150 | *cp++ = '\0'; |
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151 | while (cp && *cp) { |
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152 | if (*cp == ' ' || *cp == '\t') { |
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153 | cp++; |
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154 | continue; |
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155 | } |
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156 | if (q < &host_aliases[MAXALIASES - 1]) |
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157 | *q++ = cp; |
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158 | if ((cp = strpbrk(cp, " \t")) != NULL) |
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159 | *cp++ = '\0'; |
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160 | } |
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161 | *q = NULL; |
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162 | h_errno = NETDB_SUCCESS; |
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163 | return (&host); |
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164 | } |
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165 | |
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166 | struct hostent * |
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167 | _gethostbyhtname(name, af) |
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168 | const char *name; |
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169 | int af; |
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170 | { |
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171 | register struct hostent *p; |
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172 | register char **cp; |
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173 | |
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174 | sethostent(0); |
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175 | while ((p = gethostent()) != NULL) { |
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176 | if (p->h_addrtype != af) |
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177 | continue; |
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178 | if (strcasecmp(p->h_name, name) == 0) |
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179 | break; |
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180 | for (cp = p->h_aliases; *cp != 0; cp++) |
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181 | if (strcasecmp(*cp, name) == 0) |
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182 | goto found; |
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183 | } |
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184 | found: |
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185 | endhostent(); |
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186 | return (p); |
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187 | } |
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188 | |
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189 | struct hostent * |
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190 | _gethostbyhtaddr(addr, len, af) |
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191 | const char *addr; |
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192 | int len, af; |
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193 | { |
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194 | register struct hostent *p; |
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195 | |
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196 | sethostent(0); |
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197 | while ((p = gethostent()) != NULL) |
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198 | if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len)) |
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199 | break; |
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200 | endhostent(); |
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201 | return (p); |
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202 | } |
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