1 | /* $KAME: inet_pton.c,v 1.5 2001/08/20 02:32:40 itojun Exp $ */ |
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2 | |
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3 | /* Copyright (c) 1996 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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10 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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11 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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12 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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13 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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14 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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15 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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16 | * SOFTWARE. |
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17 | */ |
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18 | |
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19 | #include <sys/cdefs.h> |
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20 | #include <sys/types.h> |
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21 | |
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22 | #include <sys/param.h> |
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23 | #include <sys/types.h> |
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24 | #include <sys/socket.h> |
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25 | #include <netinet/in.h> |
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26 | #include <arpa/inet.h> |
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27 | #include <arpa/nameser.h> |
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28 | #include <string.h> |
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29 | #include <errno.h> |
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30 | |
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31 | /* |
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32 | * WARNING: Don't even consider trying to compile this on a system where |
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33 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. |
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34 | */ |
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35 | |
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36 | static int inet_pton4(const char *src, u_char *dst); |
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37 | static int inet_pton6(const char *src, u_char *dst); |
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38 | |
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39 | /* int |
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40 | * inet_pton(af, src, dst) |
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41 | * convert from presentation format (which usually means ASCII printable) |
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42 | * to network format (which is usually some kind of binary format). |
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43 | * return: |
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44 | * 1 if the address was valid for the specified address family |
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45 | * 0 if the address wasn't valid (`dst' is untouched in this case) |
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46 | * -1 if some other error occurred (`dst' is untouched in this case, too) |
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47 | * author: |
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48 | * Paul Vixie, 1996. |
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49 | */ |
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50 | int |
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51 | inet_pton(af, src, dst) |
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52 | int af; |
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53 | const char *src; |
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54 | void *dst; |
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55 | { |
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56 | switch (af) { |
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57 | case AF_INET: |
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58 | return (inet_pton4(src, dst)); |
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59 | case AF_INET6: |
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60 | return (inet_pton6(src, dst)); |
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61 | default: |
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62 | errno = EAFNOSUPPORT; |
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63 | return (-1); |
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64 | } |
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65 | /* NOTREACHED */ |
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66 | } |
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67 | |
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68 | /* int |
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69 | * inet_pton4(src, dst) |
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70 | * like inet_aton() but without all the hexadecimal and shorthand. |
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71 | * return: |
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72 | * 1 if `src' is a valid dotted quad, else 0. |
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73 | * notice: |
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74 | * does not touch `dst' unless it's returning 1. |
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75 | * author: |
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76 | * Paul Vixie, 1996. |
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77 | */ |
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78 | static int |
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79 | inet_pton4(src, dst) |
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80 | const char *src; |
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81 | u_char *dst; |
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82 | { |
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83 | static const char digits[] = "0123456789"; |
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84 | int saw_digit, octets, ch; |
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85 | u_char tmp[NS_INADDRSZ], *tp; |
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86 | |
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87 | saw_digit = 0; |
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88 | octets = 0; |
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89 | *(tp = tmp) = 0; |
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90 | while ((ch = *src++) != '\0') { |
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91 | const char *pch; |
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92 | |
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93 | if ((pch = strchr(digits, ch)) != NULL) { |
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94 | u_int new = *tp * 10 + (pch - digits); |
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95 | |
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96 | if (new > 255) |
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97 | return (0); |
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98 | *tp = new; |
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99 | if (! saw_digit) { |
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100 | if (++octets > 4) |
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101 | return (0); |
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102 | saw_digit = 1; |
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103 | } |
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104 | } else if (ch == '.' && saw_digit) { |
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105 | if (octets == 4) |
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106 | return (0); |
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107 | *++tp = 0; |
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108 | saw_digit = 0; |
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109 | } else |
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110 | return (0); |
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111 | } |
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112 | if (octets < 4) |
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113 | return (0); |
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114 | |
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115 | memcpy(dst, tmp, NS_INADDRSZ); |
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116 | return (1); |
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117 | } |
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118 | |
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119 | /* int |
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120 | * inet_pton6(src, dst) |
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121 | * convert presentation level address to network order binary form. |
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122 | * return: |
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123 | * 1 if `src' is a valid [RFC1884 2.2] address, else 0. |
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124 | * notice: |
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125 | * (1) does not touch `dst' unless it's returning 1. |
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126 | * (2) :: in a full address is silently ignored. |
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127 | * credit: |
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128 | * inspired by Mark Andrews. |
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129 | * author: |
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130 | * Paul Vixie, 1996. |
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131 | */ |
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132 | static int |
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133 | inet_pton6(src, dst) |
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134 | const char *src; |
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135 | u_char *dst; |
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136 | { |
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137 | static const char xdigits_l[] = "0123456789abcdef", |
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138 | xdigits_u[] = "0123456789ABCDEF"; |
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139 | u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; |
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140 | const char *xdigits, *curtok; |
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141 | int ch, saw_xdigit; |
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142 | u_int val; |
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143 | |
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144 | memset((tp = tmp), '\0', NS_IN6ADDRSZ); |
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145 | endp = tp + NS_IN6ADDRSZ; |
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146 | colonp = NULL; |
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147 | /* Leading :: requires some special handling. */ |
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148 | if (*src == ':') |
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149 | if (*++src != ':') |
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150 | return (0); |
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151 | curtok = src; |
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152 | saw_xdigit = 0; |
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153 | val = 0; |
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154 | while ((ch = *src++) != '\0') { |
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155 | const char *pch; |
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156 | |
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157 | if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) |
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158 | pch = strchr((xdigits = xdigits_u), ch); |
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159 | if (pch != NULL) { |
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160 | val <<= 4; |
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161 | val |= (pch - xdigits); |
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162 | if (val > 0xffff) |
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163 | return (0); |
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164 | saw_xdigit = 1; |
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165 | continue; |
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166 | } |
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167 | if (ch == ':') { |
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168 | curtok = src; |
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169 | if (!saw_xdigit) { |
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170 | if (colonp) |
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171 | return (0); |
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172 | colonp = tp; |
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173 | continue; |
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174 | } |
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175 | if (tp + NS_INT16SZ > endp) |
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176 | return (0); |
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177 | *tp++ = (u_char) (val >> 8) & 0xff; |
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178 | *tp++ = (u_char) val & 0xff; |
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179 | saw_xdigit = 0; |
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180 | val = 0; |
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181 | continue; |
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182 | } |
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183 | if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && |
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184 | inet_pton4(curtok, tp) > 0) { |
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185 | tp += NS_INADDRSZ; |
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186 | saw_xdigit = 0; |
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187 | break; /* '\0' was seen by inet_pton4(). */ |
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188 | } |
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189 | return (0); |
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190 | } |
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191 | if (saw_xdigit) { |
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192 | if (tp + NS_INT16SZ > endp) |
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193 | return (0); |
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194 | *tp++ = (u_char) (val >> 8) & 0xff; |
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195 | *tp++ = (u_char) val & 0xff; |
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196 | } |
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197 | if (colonp != NULL) { |
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198 | /* |
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199 | * Since some memmove()'s erroneously fail to handle |
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200 | * overlapping regions, we'll do the shift by hand. |
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201 | */ |
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202 | const int n = tp - colonp; |
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203 | int i; |
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204 | |
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205 | for (i = 1; i <= n; i++) { |
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206 | endp[- i] = colonp[n - i]; |
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207 | colonp[n - i] = 0; |
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208 | } |
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209 | tp = endp; |
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210 | } |
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211 | if (tp != endp) |
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212 | return (0); |
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213 | memcpy(dst, tmp, NS_IN6ADDRSZ); |
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214 | return (1); |
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215 | } |
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216 | |
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217 | /* |
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218 | * Weak aliases for applications that use certain private entry points, |
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219 | * and fail to include <arpa/inet.h>. |
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220 | */ |
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221 | #undef inet_pton |
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222 | __weak_reference(__inet_pton, inet_pton); |
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