1 | /* Copyright (C) 1997, 1999, 2000, 2001, 2004 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
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3 | Contributed by H.J. Lu <hjl@gnu.ai.mit.edu>, 1997. |
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4 | |
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5 | The GNU C Library is free software; you can redistribute it and/or |
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6 | modify it under the terms of the GNU Lesser General Public |
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7 | License as published by the Free Software Foundation; either |
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8 | version 2.1 of the License, or (at your option) any later version. |
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9 | |
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10 | The GNU C Library is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 | Lesser General Public License for more details. |
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14 | |
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15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library; if not, write to the Free |
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17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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18 | 02111-1307 USA. */ |
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19 | |
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20 | #include <assert.h> |
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21 | #include <errno.h> |
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22 | #include <string.h> |
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23 | #include <stdlib.h> |
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24 | #include <ctype.h> |
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25 | #include <wctype.h> |
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26 | #include <resolv.h> |
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27 | #include <netdb.h> |
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28 | #include <arpa/inet.h> |
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29 | #include "nsswitch.h" |
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30 | |
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31 | #ifdef USE_NSCD |
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32 | # define inet_aton __inet_aton |
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33 | # include <nscd/nscd_proto.h> |
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34 | #endif |
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35 | |
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36 | int |
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37 | __nss_hostname_digits_dots (const char *name, struct hostent *resbuf, |
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38 | char **buffer, size_t *buffer_size, |
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39 | size_t buflen, struct hostent **result, |
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40 | enum nss_status *status, int af, int *h_errnop) |
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41 | { |
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42 | int save; |
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43 | |
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44 | /* We have to test for the use of IPv6 which can only be done by |
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45 | examining `_res'. */ |
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46 | if (__res_maybe_init (&_res, 0) == -1) |
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47 | { |
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48 | if (h_errnop) |
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49 | *h_errnop = NETDB_INTERNAL; |
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50 | *result = NULL; |
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51 | return -1; |
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52 | } |
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53 | |
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54 | /* |
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55 | * disallow names consisting only of digits/dots, unless |
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56 | * they end in a dot. |
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57 | */ |
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58 | if (isdigit (name[0]) || isxdigit (name[0]) || name[0] == ':') |
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59 | { |
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60 | const char *cp; |
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61 | char *hostname; |
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62 | typedef unsigned char host_addr_t[16]; |
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63 | host_addr_t *host_addr; |
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64 | typedef char *host_addr_list_t[2]; |
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65 | host_addr_list_t *h_addr_ptrs; |
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66 | char **h_alias_ptr; |
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67 | size_t size_needed; |
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68 | int addr_size; |
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69 | |
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70 | switch (af) |
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71 | { |
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72 | case AF_INET: |
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73 | addr_size = INADDRSZ; |
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74 | break; |
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75 | |
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76 | case AF_INET6: |
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77 | addr_size = IN6ADDRSZ; |
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78 | break; |
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79 | |
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80 | default: |
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81 | af = (_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET; |
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82 | addr_size = af == AF_INET6 ? IN6ADDRSZ : INADDRSZ; |
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83 | break; |
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84 | } |
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85 | |
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86 | size_needed = (sizeof (*host_addr) |
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87 | + sizeof (*h_addr_ptrs) + strlen (name) + 1); |
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88 | |
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89 | if (buffer_size == NULL) |
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90 | { |
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91 | if (buflen < size_needed) |
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92 | { |
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93 | if (h_errnop != NULL) |
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94 | *h_errnop = TRY_AGAIN; |
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95 | __set_errno (ERANGE); |
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96 | goto done; |
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97 | } |
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98 | } |
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99 | else if (buffer_size != NULL && *buffer_size < size_needed) |
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100 | { |
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101 | char *new_buf; |
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102 | *buffer_size = size_needed; |
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103 | new_buf = (char *) realloc (*buffer, *buffer_size); |
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104 | |
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105 | if (new_buf == NULL) |
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106 | { |
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107 | save = errno; |
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108 | free (*buffer); |
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109 | *buffer = NULL; |
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110 | *buffer_size = 0; |
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111 | __set_errno (save); |
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112 | if (h_errnop != NULL) |
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113 | *h_errnop = TRY_AGAIN; |
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114 | *result = NULL; |
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115 | goto done; |
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116 | } |
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117 | *buffer = new_buf; |
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118 | } |
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119 | |
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120 | memset (*buffer, '\0', size_needed); |
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121 | |
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122 | host_addr = (host_addr_t *) *buffer; |
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123 | h_addr_ptrs = (host_addr_list_t *) |
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124 | ((char *) host_addr + sizeof (*host_addr)); |
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125 | h_alias_ptr = (char **) ((char *) h_addr_ptrs + sizeof (*h_addr_ptrs)); |
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126 | hostname = (char *) h_alias_ptr + sizeof (*h_alias_ptr); |
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127 | |
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128 | if (isdigit (name[0])) |
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129 | { |
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130 | for (cp = name;; ++cp) |
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131 | { |
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132 | if (*cp == '\0') |
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133 | { |
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134 | int ok; |
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135 | |
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136 | if (*--cp == '.') |
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137 | break; |
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138 | |
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139 | /* All-numeric, no dot at the end. Fake up a hostent as if |
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140 | we'd actually done a lookup. What if someone types |
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141 | 255.255.255.255? The test below will succeed |
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142 | spuriously... ??? */ |
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143 | if (af == AF_INET) |
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144 | ok = __inet_aton (name, (struct in_addr *) host_addr); |
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145 | else |
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146 | { |
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147 | assert (af == AF_INET6); |
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148 | ok = inet_pton (af, name, host_addr) > 0; |
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149 | } |
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150 | if (! ok) |
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151 | { |
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152 | *h_errnop = HOST_NOT_FOUND; |
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153 | if (buffer_size) |
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154 | *result = NULL; |
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155 | goto done; |
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156 | } |
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157 | |
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158 | resbuf->h_name = strcpy (hostname, name); |
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159 | h_alias_ptr[0] = NULL; |
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160 | resbuf->h_aliases = h_alias_ptr; |
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161 | (*h_addr_ptrs)[0] = (char *) host_addr; |
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162 | (*h_addr_ptrs)[1] = NULL; |
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163 | resbuf->h_addr_list = *h_addr_ptrs; |
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164 | if (af == AF_INET && (_res.options & RES_USE_INET6)) |
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165 | { |
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166 | /* We need to change the IP v4 address into the |
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167 | IP v6 address. */ |
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168 | char tmp[INADDRSZ]; |
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169 | char *p = (char *) host_addr; |
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170 | int i; |
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171 | |
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172 | /* Save a copy of the IP v4 address. */ |
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173 | memcpy (tmp, host_addr, INADDRSZ); |
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174 | /* Mark this ipv6 addr as a mapped ipv4. */ |
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175 | for (i = 0; i < 10; i++) |
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176 | *p++ = 0x00; |
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177 | *p++ = 0xff; |
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178 | *p++ = 0xff; |
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179 | /* Copy the IP v4 address. */ |
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180 | memcpy (p, tmp, INADDRSZ); |
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181 | resbuf->h_addrtype = AF_INET6; |
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182 | resbuf->h_length = IN6ADDRSZ; |
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183 | } |
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184 | else |
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185 | { |
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186 | resbuf->h_addrtype = af; |
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187 | resbuf->h_length = addr_size; |
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188 | } |
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189 | if (h_errnop != NULL) |
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190 | *h_errnop = NETDB_SUCCESS; |
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191 | if (buffer_size == NULL) |
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192 | *status = NSS_STATUS_SUCCESS; |
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193 | else |
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194 | *result = resbuf; |
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195 | goto done; |
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196 | } |
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197 | |
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198 | if (!isdigit (*cp) && *cp != '.') |
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199 | break; |
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200 | } |
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201 | } |
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202 | |
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203 | if ((isxdigit (name[0]) && strchr (name, ':') != NULL) || name[0] == ':') |
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204 | { |
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205 | const char *cp; |
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206 | char *hostname; |
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207 | typedef unsigned char host_addr_t[16]; |
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208 | host_addr_t *host_addr; |
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209 | typedef char *host_addr_list_t[2]; |
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210 | host_addr_list_t *h_addr_ptrs; |
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211 | size_t size_needed; |
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212 | int addr_size; |
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213 | |
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214 | switch (af) |
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215 | { |
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216 | default: |
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217 | af = (_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET; |
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218 | if (af == AF_INET6) |
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219 | { |
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220 | addr_size = IN6ADDRSZ; |
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221 | break; |
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222 | } |
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223 | /* FALLTHROUGH */ |
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224 | |
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225 | case AF_INET: |
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226 | /* This is not possible. We cannot represent an IPv6 address |
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227 | in an `struct in_addr' variable. */ |
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228 | *h_errnop = HOST_NOT_FOUND; |
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229 | *result = NULL; |
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230 | goto done; |
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231 | |
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232 | case AF_INET6: |
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233 | addr_size = IN6ADDRSZ; |
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234 | break; |
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235 | } |
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236 | |
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237 | size_needed = (sizeof (*host_addr) |
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238 | + sizeof (*h_addr_ptrs) + strlen (name) + 1); |
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239 | |
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240 | if (buffer_size == NULL && buflen < size_needed) |
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241 | { |
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242 | if (h_errnop != NULL) |
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243 | *h_errnop = TRY_AGAIN; |
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244 | __set_errno (ERANGE); |
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245 | goto done; |
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246 | } |
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247 | else if (buffer_size != NULL && *buffer_size < size_needed) |
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248 | { |
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249 | char *new_buf; |
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250 | *buffer_size = size_needed; |
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251 | new_buf = realloc (*buffer, *buffer_size); |
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252 | |
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253 | if (new_buf == NULL) |
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254 | { |
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255 | save = errno; |
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256 | free (*buffer); |
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257 | __set_errno (save); |
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258 | *buffer = NULL; |
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259 | *buffer_size = 0; |
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260 | *result = NULL; |
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261 | goto done; |
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262 | } |
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263 | *buffer = new_buf; |
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264 | } |
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265 | |
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266 | memset (*buffer, '\0', size_needed); |
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267 | |
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268 | host_addr = (host_addr_t *) *buffer; |
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269 | h_addr_ptrs = (host_addr_list_t *) |
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270 | ((char *) host_addr + sizeof (*host_addr)); |
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271 | hostname = (char *) h_addr_ptrs + sizeof (*h_addr_ptrs); |
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272 | |
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273 | for (cp = name;; ++cp) |
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274 | { |
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275 | if (!*cp) |
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276 | { |
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277 | if (*--cp == '.') |
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278 | break; |
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279 | |
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280 | /* All-IPv6-legal, no dot at the end. Fake up a |
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281 | hostent as if we'd actually done a lookup. */ |
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282 | if (inet_pton (AF_INET6, name, host_addr) <= 0) |
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283 | { |
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284 | *h_errnop = HOST_NOT_FOUND; |
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285 | if (buffer_size) |
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286 | *result = NULL; |
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287 | goto done; |
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288 | } |
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289 | |
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290 | resbuf->h_name = strcpy (hostname, name); |
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291 | h_alias_ptr[0] = NULL; |
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292 | resbuf->h_aliases = h_alias_ptr; |
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293 | (*h_addr_ptrs)[0] = (char *) host_addr; |
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294 | (*h_addr_ptrs)[1] = (char *) 0; |
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295 | resbuf->h_addr_list = *h_addr_ptrs; |
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296 | resbuf->h_addrtype = AF_INET6; |
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297 | resbuf->h_length = addr_size; |
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298 | *h_errnop = NETDB_SUCCESS; |
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299 | if (buffer_size == NULL) |
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300 | *status = NSS_STATUS_SUCCESS; |
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301 | else |
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302 | *result = resbuf; |
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303 | goto done; |
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304 | } |
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305 | |
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306 | if (!isxdigit (*cp) && *cp != ':' && *cp != '.') |
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307 | break; |
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308 | } |
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309 | } |
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310 | } |
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311 | |
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312 | return 0; |
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313 | |
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314 | done: |
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315 | return 1; |
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316 | } |
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317 | libc_hidden_def (__nss_hostname_digits_dots) |
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