1 | /* |
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2 | * Copyright (c) 1996 by Internet Software Consortium. |
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3 | * |
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4 | * Permission to use, copy, modify, and distribute this software for any |
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5 | * purpose with or without fee is hereby granted, provided that the above |
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6 | * copyright notice and this permission notice appear in all copies. |
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7 | * |
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8 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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9 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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10 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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11 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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12 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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13 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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14 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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15 | * SOFTWARE. |
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16 | */ |
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17 | |
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18 | #if HAVE_CONFIG_H |
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19 | #include "config.h" |
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20 | #endif |
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21 | |
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22 | #include <sys/types.h> |
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23 | #include <sys/socket.h> |
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24 | #include <netinet/in.h> |
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25 | #include <arpa/inet.h> |
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26 | |
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27 | #include <assert.h> |
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28 | #include <ctype.h> |
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29 | #include <errno.h> |
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30 | #include <stdio.h> |
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31 | #include <string.h> |
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32 | #include <stdlib.h> |
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33 | |
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34 | #ifdef SPRINTF_CHAR |
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35 | # define SPRINTF(x) strlen(sprintf/**/x) |
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36 | #else |
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37 | # define SPRINTF(x) ((size_t)sprintf x) |
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38 | #endif |
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39 | |
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40 | static int inet_net_pton_ipv4 __P((const char *src, u_char *dst, |
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41 | size_t size)); |
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42 | |
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43 | /* |
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44 | * static int |
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45 | * inet_net_pton(af, src, dst, size) |
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46 | * convert network number from presentation to network format. |
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47 | * accepts hex octets, hex strings, decimal octets, and /CIDR. |
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48 | * "size" is in bytes and describes "dst". |
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49 | * return: |
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50 | * number of bits, either imputed classfully or specified with /CIDR, |
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51 | * or -1 if some failure occurred (check errno). ENOENT means it was |
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52 | * not a valid network specification. |
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53 | * author: |
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54 | * Paul Vixie (ISC), June 1996 |
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55 | */ |
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56 | int |
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57 | inet_net_pton(af, src, dst, size) |
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58 | int af; |
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59 | const char *src; |
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60 | void *dst; |
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61 | size_t size; |
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62 | { |
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63 | switch (af) { |
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64 | case AF_INET: |
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65 | return (inet_net_pton_ipv4(src, dst, size)); |
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66 | default: |
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67 | errno = EAFNOSUPPORT; |
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68 | return (-1); |
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69 | } |
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70 | } |
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71 | |
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72 | /* |
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73 | * static int |
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74 | * inet_net_pton_ipv4(src, dst, size) |
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75 | * convert IPv4 network number from presentation to network format. |
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76 | * accepts hex octets, hex strings, decimal octets, and /CIDR. |
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77 | * "size" is in bytes and describes "dst". |
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78 | * return: |
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79 | * number of bits, either imputed classfully or specified with /CIDR, |
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80 | * or -1 if some failure occurred (check errno). ENOENT means it was |
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81 | * not an IPv4 network specification. |
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82 | * note: |
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83 | * network byte order assumed. this means 192.5.5.240/28 has |
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84 | * 0x11110000 in its fourth octet. |
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85 | * author: |
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86 | * Paul Vixie (ISC), June 1996 |
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87 | */ |
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88 | static int |
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89 | inet_net_pton_ipv4(src, dst, size) |
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90 | const char *src; |
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91 | u_char *dst; |
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92 | size_t size; |
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93 | { |
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94 | static const char |
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95 | xdigits[] = "0123456789abcdef", |
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96 | digits[] = "0123456789"; |
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97 | int n, ch, tmp, dirty, bits; |
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98 | const u_char *odst = dst; |
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99 | |
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100 | ch = *src++; |
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101 | if (ch == '0' && (src[0] == 'x' || src[0] == 'X') |
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102 | && isascii(src[1]) && isxdigit(src[1])) { |
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103 | /* Hexadecimal: Eat nybble string. */ |
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104 | if (size <= 0) |
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105 | goto emsgsize; |
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106 | *dst = 0, dirty = 0; |
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107 | src++; /* skip x or X. */ |
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108 | while ((ch = *src++) != '\0' && |
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109 | isascii(ch) && isxdigit(ch)) { |
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110 | if (isupper(ch)) |
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111 | ch = tolower(ch); |
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112 | n = strchr(xdigits, ch) - xdigits; |
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113 | assert(n >= 0 && n <= 15); |
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114 | *dst |= n; |
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115 | if (!dirty++) |
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116 | *dst <<= 4; |
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117 | else if (size-- > 0) |
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118 | *++dst = 0, dirty = 0; |
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119 | else |
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120 | goto emsgsize; |
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121 | } |
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122 | if (dirty) |
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123 | size--; |
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124 | } else if (isascii(ch) && isdigit(ch)) { |
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125 | /* Decimal: eat dotted digit string. */ |
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126 | for (;;) { |
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127 | tmp = 0; |
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128 | do { |
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129 | n = strchr(digits, ch) - digits; |
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130 | assert(n >= 0 && n <= 9); |
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131 | tmp *= 10; |
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132 | tmp += n; |
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133 | if (tmp > 255) |
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134 | goto enoent; |
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135 | } while ((ch = *src++) != '\0' && |
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136 | isascii(ch) && isdigit(ch)); |
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137 | if (size-- <= 0) |
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138 | goto emsgsize; |
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139 | *dst++ = (u_char) tmp; |
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140 | if (ch == '\0' || ch == '/') |
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141 | break; |
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142 | if (ch != '.') |
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143 | goto enoent; |
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144 | ch = *src++; |
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145 | if (!isascii(ch) || !isdigit(ch)) |
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146 | goto enoent; |
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147 | } |
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148 | } else |
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149 | goto enoent; |
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150 | |
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151 | bits = -1; |
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152 | if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst) { |
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153 | /* CIDR width specifier. Nothing can follow it. */ |
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154 | ch = *src++; /* Skip over the /. */ |
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155 | bits = 0; |
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156 | do { |
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157 | n = strchr(digits, ch) - digits; |
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158 | assert(n >= 0 && n <= 9); |
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159 | bits *= 10; |
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160 | bits += n; |
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161 | } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch)); |
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162 | if (ch != '\0') |
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163 | goto enoent; |
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164 | if (bits > 32) |
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165 | goto emsgsize; |
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166 | } |
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167 | |
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168 | /* Firey death and destruction unless we prefetched EOS. */ |
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169 | if (ch != '\0') |
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170 | goto enoent; |
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171 | |
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172 | /* If nothing was written to the destination, we found no address. */ |
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173 | if (dst == odst) |
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174 | goto enoent; |
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175 | /* If no CIDR spec was given, infer width from net class. */ |
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176 | if (bits == -1) { |
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177 | if (*odst >= 240) /* Class E */ |
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178 | bits = 32; |
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179 | else if (*odst >= 224) /* Class D */ |
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180 | bits = 4; |
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181 | else if (*odst >= 192) /* Class C */ |
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182 | bits = 24; |
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183 | else if (*odst >= 128) /* Class B */ |
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184 | bits = 16; |
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185 | else /* Class A */ |
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186 | bits = 8; |
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187 | /* If imputed mask is narrower than specified octets, widen. */ |
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188 | if (bits >= 8 && bits < ((dst - odst) * 8)) |
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189 | bits = (dst - odst) * 8; |
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190 | } |
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191 | /* Extend network to cover the actual mask. */ |
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192 | while (bits > ((dst - odst) * 8)) { |
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193 | if (size-- <= 0) |
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194 | goto emsgsize; |
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195 | *dst++ = '\0'; |
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196 | } |
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197 | return (bits); |
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198 | |
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199 | enoent: |
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200 | errno = ENOENT; |
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201 | return (-1); |
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202 | |
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203 | emsgsize: |
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204 | errno = EMSGSIZE; |
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205 | return (-1); |
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206 | } |
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