1 | /* |
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2 | * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") |
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3 | * Copyright (c) 1996,1999 by Internet Software Consortium. |
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4 | * |
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5 | * Permission to use, copy, modify, and distribute this software for any |
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6 | * purpose with or without fee is hereby granted, provided that the above |
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7 | * copyright notice and this permission notice appear in all copies. |
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8 | * |
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9 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
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10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR |
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12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
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15 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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16 | */ |
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17 | |
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18 | #if defined(LIBC_SCCS) && !defined(lint) |
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19 | static const char rcsid[] = "$Id: inet_net_pton.c,v 1.7.18.2 2008/08/26 04:42:43 marka Exp $"; |
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20 | #endif |
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21 | #include <sys/cdefs.h> |
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22 | __FBSDID("$FreeBSD$"); |
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23 | |
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24 | #include "port_before.h" |
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25 | |
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26 | #include <sys/types.h> |
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27 | #include <sys/socket.h> |
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28 | #include <netinet/in.h> |
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29 | #include <arpa/nameser.h> |
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30 | #include <arpa/inet.h> |
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31 | |
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32 | #include <assert.h> |
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33 | #include <ctype.h> |
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34 | #include <errno.h> |
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35 | #include <stdio.h> |
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36 | #include <string.h> |
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37 | #include <stdlib.h> |
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38 | |
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39 | #include "port_after.h" |
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40 | |
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41 | #ifdef SPRINTF_CHAR |
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42 | # define SPRINTF(x) strlen(sprintf/**/x) |
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43 | #else |
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44 | # define SPRINTF(x) ((size_t)sprintf x) |
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45 | #endif |
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46 | |
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47 | /*% |
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48 | * static int |
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49 | * inet_net_pton_ipv4(src, dst, size) |
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50 | * convert IPv4 network number from presentation to network format. |
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51 | * accepts hex octets, hex strings, decimal octets, and /CIDR. |
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52 | * "size" is in bytes and describes "dst". |
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53 | * return: |
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54 | * number of bits, either imputed classfully or specified with /CIDR, |
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55 | * or -1 if some failure occurred (check errno). ENOENT means it was |
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56 | * not an IPv4 network specification. |
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57 | * note: |
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58 | * network byte order assumed. this means 192.5.5.240/28 has |
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59 | * 0b11110000 in its fourth octet. |
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60 | * author: |
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61 | * Paul Vixie (ISC), June 1996 |
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62 | */ |
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63 | static int |
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64 | inet_net_pton_ipv4(const char *src, u_char *dst, size_t size) { |
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65 | static const char xdigits[] = "0123456789abcdef"; |
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66 | static const char digits[] = "0123456789"; |
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67 | int n, ch, tmp = 0, dirty, bits; |
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68 | const u_char *odst = dst; |
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69 | |
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70 | ch = *src++; |
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71 | if (ch == '0' && (src[0] == 'x' || src[0] == 'X') |
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72 | && isascii((unsigned char)(src[1])) |
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73 | && isxdigit((unsigned char)(src[1]))) { |
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74 | /* Hexadecimal: Eat nybble string. */ |
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75 | if (size <= 0U) |
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76 | goto emsgsize; |
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77 | dirty = 0; |
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78 | src++; /*%< skip x or X. */ |
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79 | while ((ch = *src++) != '\0' && isascii(ch) && isxdigit(ch)) { |
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80 | if (isupper(ch)) |
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81 | ch = tolower(ch); |
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82 | n = strchr(xdigits, ch) - xdigits; |
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83 | assert(n >= 0 && n <= 15); |
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84 | if (dirty == 0) |
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85 | tmp = n; |
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86 | else |
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87 | tmp = (tmp << 4) | n; |
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88 | if (++dirty == 2) { |
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89 | if (size-- <= 0U) |
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90 | goto emsgsize; |
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91 | *dst++ = (u_char) tmp; |
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92 | dirty = 0; |
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93 | } |
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94 | } |
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95 | if (dirty) { /*%< Odd trailing nybble? */ |
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96 | if (size-- <= 0U) |
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97 | goto emsgsize; |
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98 | *dst++ = (u_char) (tmp << 4); |
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99 | } |
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100 | } else if (isascii(ch) && isdigit(ch)) { |
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101 | /* Decimal: eat dotted digit string. */ |
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102 | for (;;) { |
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103 | tmp = 0; |
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104 | do { |
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105 | n = strchr(digits, ch) - digits; |
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106 | assert(n >= 0 && n <= 9); |
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107 | tmp *= 10; |
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108 | tmp += n; |
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109 | if (tmp > 255) |
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110 | goto enoent; |
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111 | } while ((ch = *src++) != '\0' && |
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112 | isascii(ch) && isdigit(ch)); |
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113 | if (size-- <= 0U) |
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114 | goto emsgsize; |
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115 | *dst++ = (u_char) tmp; |
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116 | if (ch == '\0' || ch == '/') |
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117 | break; |
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118 | if (ch != '.') |
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119 | goto enoent; |
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120 | ch = *src++; |
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121 | if (!isascii(ch) || !isdigit(ch)) |
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122 | goto enoent; |
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123 | } |
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124 | } else |
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125 | goto enoent; |
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126 | |
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127 | bits = -1; |
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128 | if (ch == '/' && isascii((unsigned char)(src[0])) && |
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129 | isdigit((unsigned char)(src[0])) && dst > odst) { |
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130 | /* CIDR width specifier. Nothing can follow it. */ |
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131 | ch = *src++; /*%< Skip over the /. */ |
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132 | bits = 0; |
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133 | do { |
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134 | n = strchr(digits, ch) - digits; |
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135 | assert(n >= 0 && n <= 9); |
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136 | bits *= 10; |
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137 | bits += n; |
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138 | if (bits > 32) |
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139 | goto enoent; |
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140 | } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch)); |
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141 | if (ch != '\0') |
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142 | goto enoent; |
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143 | } |
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144 | |
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145 | /* Firey death and destruction unless we prefetched EOS. */ |
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146 | if (ch != '\0') |
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147 | goto enoent; |
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148 | |
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149 | /* If nothing was written to the destination, we found no address. */ |
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150 | if (dst == odst) |
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151 | goto enoent; |
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152 | /* If no CIDR spec was given, infer width from net class. */ |
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153 | if (bits == -1) { |
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154 | if (*odst >= 240) /*%< Class E */ |
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155 | bits = 32; |
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156 | else if (*odst >= 224) /*%< Class D */ |
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157 | bits = 8; |
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158 | else if (*odst >= 192) /*%< Class C */ |
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159 | bits = 24; |
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160 | else if (*odst >= 128) /*%< Class B */ |
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161 | bits = 16; |
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162 | else /*%< Class A */ |
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163 | bits = 8; |
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164 | /* If imputed mask is narrower than specified octets, widen. */ |
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165 | if (bits < ((dst - odst) * 8)) |
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166 | bits = (dst - odst) * 8; |
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167 | /* |
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168 | * If there are no additional bits specified for a class D |
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169 | * address adjust bits to 4. |
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170 | */ |
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171 | if (bits == 8 && *odst == 224) |
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172 | bits = 4; |
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173 | } |
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174 | /* Extend network to cover the actual mask. */ |
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175 | while (bits > ((dst - odst) * 8)) { |
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176 | if (size-- <= 0U) |
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177 | goto emsgsize; |
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178 | *dst++ = '\0'; |
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179 | } |
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180 | return (bits); |
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181 | |
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182 | enoent: |
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183 | errno = ENOENT; |
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184 | return (-1); |
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185 | |
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186 | emsgsize: |
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187 | errno = EMSGSIZE; |
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188 | return (-1); |
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189 | } |
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190 | |
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191 | static int |
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192 | getbits(const char *src, int *bitsp) { |
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193 | static const char digits[] = "0123456789"; |
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194 | int n; |
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195 | int val; |
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196 | char ch; |
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197 | |
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198 | val = 0; |
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199 | n = 0; |
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200 | while ((ch = *src++) != '\0') { |
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201 | const char *pch; |
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202 | |
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203 | pch = strchr(digits, ch); |
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204 | if (pch != NULL) { |
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205 | if (n++ != 0 && val == 0) /*%< no leading zeros */ |
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206 | return (0); |
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207 | val *= 10; |
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208 | val += (pch - digits); |
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209 | if (val > 128) /*%< range */ |
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210 | return (0); |
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211 | continue; |
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212 | } |
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213 | return (0); |
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214 | } |
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215 | if (n == 0) |
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216 | return (0); |
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217 | *bitsp = val; |
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218 | return (1); |
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219 | } |
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220 | |
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221 | static int |
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222 | getv4(const char *src, u_char *dst, int *bitsp) { |
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223 | static const char digits[] = "0123456789"; |
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224 | u_char *odst = dst; |
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225 | int n; |
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226 | u_int val; |
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227 | char ch; |
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228 | |
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229 | val = 0; |
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230 | n = 0; |
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231 | while ((ch = *src++) != '\0') { |
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232 | const char *pch; |
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233 | |
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234 | pch = strchr(digits, ch); |
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235 | if (pch != NULL) { |
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236 | if (n++ != 0 && val == 0) /*%< no leading zeros */ |
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237 | return (0); |
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238 | val *= 10; |
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239 | val += (pch - digits); |
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240 | if (val > 255) /*%< range */ |
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241 | return (0); |
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242 | continue; |
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243 | } |
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244 | if (ch == '.' || ch == '/') { |
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245 | if (dst - odst > 3) /*%< too many octets? */ |
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246 | return (0); |
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247 | *dst++ = val; |
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248 | if (ch == '/') |
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249 | return (getbits(src, bitsp)); |
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250 | val = 0; |
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251 | n = 0; |
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252 | continue; |
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253 | } |
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254 | return (0); |
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255 | } |
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256 | if (n == 0) |
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257 | return (0); |
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258 | if (dst - odst > 3) /*%< too many octets? */ |
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259 | return (0); |
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260 | *dst++ = val; |
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261 | return (1); |
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262 | } |
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263 | |
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264 | static int |
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265 | inet_net_pton_ipv6(const char *src, u_char *dst, size_t size) { |
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266 | static const char xdigits_l[] = "0123456789abcdef", |
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267 | xdigits_u[] = "0123456789ABCDEF"; |
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268 | u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; |
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269 | const char *xdigits, *curtok; |
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270 | int ch, saw_xdigit; |
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271 | u_int val; |
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272 | int digits; |
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273 | int bits; |
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274 | size_t bytes; |
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275 | int words; |
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276 | int ipv4; |
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277 | |
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278 | memset((tp = tmp), '\0', NS_IN6ADDRSZ); |
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279 | endp = tp + NS_IN6ADDRSZ; |
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280 | colonp = NULL; |
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281 | /* Leading :: requires some special handling. */ |
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282 | if (*src == ':') |
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283 | if (*++src != ':') |
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284 | goto enoent; |
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285 | curtok = src; |
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286 | saw_xdigit = 0; |
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287 | val = 0; |
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288 | digits = 0; |
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289 | bits = -1; |
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290 | ipv4 = 0; |
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291 | while ((ch = *src++) != '\0') { |
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292 | const char *pch; |
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293 | |
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294 | if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) |
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295 | pch = strchr((xdigits = xdigits_u), ch); |
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296 | if (pch != NULL) { |
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297 | val <<= 4; |
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298 | val |= (pch - xdigits); |
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299 | if (++digits > 4) |
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300 | goto enoent; |
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301 | saw_xdigit = 1; |
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302 | continue; |
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303 | } |
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304 | if (ch == ':') { |
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305 | curtok = src; |
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306 | if (!saw_xdigit) { |
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307 | if (colonp) |
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308 | goto enoent; |
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309 | colonp = tp; |
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310 | continue; |
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311 | } else if (*src == '\0') |
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312 | goto enoent; |
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313 | if (tp + NS_INT16SZ > endp) |
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314 | return (0); |
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315 | *tp++ = (u_char) (val >> 8) & 0xff; |
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316 | *tp++ = (u_char) val & 0xff; |
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317 | saw_xdigit = 0; |
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318 | digits = 0; |
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319 | val = 0; |
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320 | continue; |
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321 | } |
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322 | if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && |
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323 | getv4(curtok, tp, &bits) > 0) { |
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324 | tp += NS_INADDRSZ; |
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325 | saw_xdigit = 0; |
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326 | ipv4 = 1; |
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327 | break; /*%< '\\0' was seen by inet_pton4(). */ |
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328 | } |
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329 | if (ch == '/' && getbits(src, &bits) > 0) |
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330 | break; |
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331 | goto enoent; |
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332 | } |
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333 | if (saw_xdigit) { |
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334 | if (tp + NS_INT16SZ > endp) |
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335 | goto enoent; |
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336 | *tp++ = (u_char) (val >> 8) & 0xff; |
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337 | *tp++ = (u_char) val & 0xff; |
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338 | } |
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339 | if (bits == -1) |
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340 | bits = 128; |
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341 | |
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342 | words = (bits + 15) / 16; |
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343 | if (words < 2) |
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344 | words = 2; |
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345 | if (ipv4) |
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346 | words = 8; |
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347 | endp = tmp + 2 * words; |
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348 | |
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349 | if (colonp != NULL) { |
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350 | /* |
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351 | * Since some memmove()'s erroneously fail to handle |
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352 | * overlapping regions, we'll do the shift by hand. |
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353 | */ |
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354 | const int n = tp - colonp; |
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355 | int i; |
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356 | |
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357 | if (tp == endp) |
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358 | goto enoent; |
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359 | for (i = 1; i <= n; i++) { |
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360 | endp[- i] = colonp[n - i]; |
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361 | colonp[n - i] = 0; |
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362 | } |
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363 | tp = endp; |
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364 | } |
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365 | if (tp != endp) |
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366 | goto enoent; |
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367 | |
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368 | bytes = (bits + 7) / 8; |
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369 | if (bytes > size) |
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370 | goto emsgsize; |
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371 | memcpy(dst, tmp, bytes); |
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372 | return (bits); |
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373 | |
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374 | enoent: |
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375 | errno = ENOENT; |
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376 | return (-1); |
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377 | |
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378 | emsgsize: |
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379 | errno = EMSGSIZE; |
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380 | return (-1); |
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381 | } |
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382 | |
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383 | /*% |
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384 | * int |
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385 | * inet_net_pton(af, src, dst, size) |
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386 | * convert network number from presentation to network format. |
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387 | * accepts hex octets, hex strings, decimal octets, and /CIDR. |
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388 | * "size" is in bytes and describes "dst". |
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389 | * return: |
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390 | * number of bits, either imputed classfully or specified with /CIDR, |
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391 | * or -1 if some failure occurred (check errno). ENOENT means it was |
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392 | * not a valid network specification. |
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393 | * author: |
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394 | * Paul Vixie (ISC), June 1996 |
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395 | */ |
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396 | int |
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397 | inet_net_pton(int af, const char *src, void *dst, size_t size) { |
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398 | switch (af) { |
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399 | case AF_INET: |
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400 | return (inet_net_pton_ipv4(src, dst, size)); |
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401 | case AF_INET6: |
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402 | return (inet_net_pton_ipv6(src, dst, size)); |
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403 | default: |
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404 | errno = EAFNOSUPPORT; |
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405 | return (-1); |
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406 | } |
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407 | } |
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408 | |
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409 | /* |
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410 | * Weak aliases for applications that use certain private entry points, |
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411 | * and fail to include <arpa/inet.h>. |
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412 | */ |
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413 | #undef inet_net_pton |
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414 | __weak_reference(__inet_net_pton, inet_net_pton); |
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415 | |
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416 | /*! \file */ |
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