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| 1 | +/* |
| 2 | + * Copyright (C) 1996-2001 Internet Software Consortium. |
| 3 | + * |
| 4 | + * Permission to use, copy, modify, and distribute this software for any |
| 5 | + * purpose with or without fee is hereby granted, provided that the above |
| 6 | + * copyright notice and this permission notice appear in all copies. |
| 7 | + * |
| 8 | + * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM |
| 9 | + * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL |
| 10 | + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL |
| 11 | + * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, |
| 12 | + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING |
| 13 | + * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, |
| 14 | + * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION |
| 15 | + * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 16 | + */ |
| 17 | + |
| 18 | +#include <errno.h> |
| 19 | +#include <sys/types.h> |
| 20 | +#include <sys/socket.h> |
| 21 | +#include <sys/socket.h> |
| 22 | +#include <netinet/in.h> |
| 23 | +#include <arpa/inet.h> |
| 24 | +#include <stdio.h> |
| 25 | +#include <string.h> |
| 26 | + |
| 27 | +#ifndef NS_INT16SZ |
| 28 | +#define NS_INT16SZ 2 |
| 29 | +#endif |
| 30 | + |
| 31 | +#ifndef NS_INADDRSZ |
| 32 | +#define NS_INADDRSZ 4 |
| 33 | +#endif |
| 34 | + |
| 35 | +#ifndef NS_IN6ADDRSZ |
| 36 | +#define NS_IN6ADDRSZ 16 |
| 37 | +#endif |
| 38 | + |
| 39 | +/* |
| 40 | + * WARNING: Don't even consider trying to compile this on a system where |
| 41 | + * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. |
| 42 | + */ |
| 43 | + |
| 44 | +static int inet_pton4(const char *src, unsigned char *dst); |
| 45 | +static int inet_pton6(const char *src, unsigned char *dst); |
| 46 | + |
| 47 | +/* int |
| 48 | + * inet_pton4(src, dst) |
| 49 | + * like inet_aton() but without all the hexadecimal and shorthand. |
| 50 | + * return: |
| 51 | + * 1 if `src' is a valid dotted quad, else 0. |
| 52 | + * notice: |
| 53 | + * does not touch `dst' unless it's returning 1. |
| 54 | + * author: |
| 55 | + * Paul Vixie, 1996. |
| 56 | + */ |
| 57 | +static int |
| 58 | +inet_pton4(const char *src, unsigned char *dst) |
| 59 | +{ |
| 60 | + static const char digits[] = "0123456789"; |
| 61 | + int saw_digit, octets, ch; |
| 62 | + unsigned char tmp[NS_INADDRSZ], *tp; |
| 63 | + |
| 64 | + saw_digit = 0; |
| 65 | + octets = 0; |
| 66 | + *(tp = tmp) = 0; |
| 67 | + while ((ch = *src++) != '\0') { |
| 68 | + const char *pch; |
| 69 | + |
| 70 | + if ((pch = strchr(digits, ch)) != NULL) { |
| 71 | + unsigned int new = *tp * 10 + (pch - digits); |
| 72 | + |
| 73 | + if (new > 255) |
| 74 | + return (0); |
| 75 | + *tp = new; |
| 76 | + if (! saw_digit) { |
| 77 | + if (++octets > 4) |
| 78 | + return (0); |
| 79 | + saw_digit = 1; |
| 80 | + } |
| 81 | + } else if (ch == '.' && saw_digit) { |
| 82 | + if (octets == 4) |
| 83 | + return (0); |
| 84 | + *++tp = 0; |
| 85 | + saw_digit = 0; |
| 86 | + } else |
| 87 | + return (0); |
| 88 | + } |
| 89 | + if (octets < 4) |
| 90 | + return (0); |
| 91 | + memcpy(dst, tmp, NS_INADDRSZ); |
| 92 | + return (1); |
| 93 | +} |
| 94 | + |
| 95 | +/* int |
| 96 | + * inet_pton6(src, dst) |
| 97 | + * convert presentation level address to network order binary form. |
| 98 | + * return: |
| 99 | + * 1 if `src' is a valid [RFC1884 2.2] address, else 0. |
| 100 | + * notice: |
| 101 | + * (1) does not touch `dst' unless it's returning 1. |
| 102 | + * (2) :: in a full address is silently ignored. |
| 103 | + * credit: |
| 104 | + * inspired by Mark Andrews. |
| 105 | + * author: |
| 106 | + * Paul Vixie, 1996. |
| 107 | + */ |
| 108 | + |
| 109 | +#ifndef NO_IPV6 |
| 110 | +static int |
| 111 | +inet_pton6(const char *src, unsigned char *dst) |
| 112 | +{ |
| 113 | + static const char xdigits_l[] = "0123456789abcdef", |
| 114 | + xdigits_u[] = "0123456789ABCDEF"; |
| 115 | + unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; |
| 116 | + const char *xdigits, *curtok; |
| 117 | + int ch, saw_xdigit; |
| 118 | + unsigned int val; |
| 119 | + |
| 120 | + memset((tp = tmp), '\0', NS_IN6ADDRSZ); |
| 121 | + endp = tp + NS_IN6ADDRSZ; |
| 122 | + colonp = NULL; |
| 123 | + /* Leading :: requires some special handling. */ |
| 124 | + if (*src == ':') |
| 125 | + if (*++src != ':') |
| 126 | + return (0); |
| 127 | + curtok = src; |
| 128 | + saw_xdigit = 0; |
| 129 | + val = 0; |
| 130 | + while ((ch = *src++) != '\0') { |
| 131 | + const char *pch; |
| 132 | + |
| 133 | + if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) |
| 134 | + pch = strchr((xdigits = xdigits_u), ch); |
| 135 | + if (pch != NULL) { |
| 136 | + val <<= 4; |
| 137 | + val |= (pch - xdigits); |
| 138 | + if (val > 0xffff) |
| 139 | + return (0); |
| 140 | + saw_xdigit = 1; |
| 141 | + continue; |
| 142 | + } |
| 143 | + if (ch == ':') { |
| 144 | + curtok = src; |
| 145 | + if (!saw_xdigit) { |
| 146 | + if (colonp) |
| 147 | + return (0); |
| 148 | + colonp = tp; |
| 149 | + continue; |
| 150 | + } |
| 151 | + if (tp + NS_INT16SZ > endp) |
| 152 | + return (0); |
| 153 | + *tp++ = (unsigned char) (val >> 8) & 0xff; |
| 154 | + *tp++ = (unsigned char) val & 0xff; |
| 155 | + saw_xdigit = 0; |
| 156 | + val = 0; |
| 157 | + continue; |
| 158 | + } |
| 159 | + if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && |
| 160 | + inet_pton4(curtok, tp) > 0) { |
| 161 | + tp += NS_INADDRSZ; |
| 162 | + saw_xdigit = 0; |
| 163 | + break; /* '\0' was seen by inet_pton4(). */ |
| 164 | + } |
| 165 | + return (0); |
| 166 | + } |
| 167 | + if (saw_xdigit) { |
| 168 | + if (tp + NS_INT16SZ > endp) |
| 169 | + return (0); |
| 170 | + *tp++ = (unsigned char) (val >> 8) & 0xff; |
| 171 | + *tp++ = (unsigned char) val & 0xff; |
| 172 | + } |
| 173 | + if (colonp != NULL) { |
| 174 | + /* |
| 175 | + * Since some memmove()'s erroneously fail to handle |
| 176 | + * overlapping regions, we'll do the shift by hand. |
| 177 | + */ |
| 178 | + const int n = tp - colonp; |
| 179 | + int i; |
| 180 | + |
| 181 | + for (i = 1; i <= n; i++) { |
| 182 | + endp[- i] = colonp[n - i]; |
| 183 | + colonp[n - i] = 0; |
| 184 | + } |
| 185 | + tp = endp; |
| 186 | + } |
| 187 | + if (tp != endp) |
| 188 | + return (0); |
| 189 | + memcpy(dst, tmp, NS_IN6ADDRSZ); |
| 190 | + return (1); |
| 191 | +} |
| 192 | +#endif |
| 193 | + |
| 194 | +/* int |
| 195 | + * isc_net_pton(af, src, dst) |
| 196 | + * convert from presentation format (which usually means ASCII printable) |
| 197 | + * to network format (which is usually some kind of binary format). |
| 198 | + * return: |
| 199 | + * 1 if the address was valid for the specified address family |
| 200 | + * 0 if the address wasn't valid (`dst' is untouched in this case) |
| 201 | + * -1 if some other error occurred (`dst' is untouched in this case, too) |
| 202 | + * author: |
| 203 | + * Paul Vixie, 1996. |
| 204 | + */ |
| 205 | +int |
| 206 | +inet_pton(int af, const char *src, void *dst) |
| 207 | +{ |
| 208 | + switch (af) { |
| 209 | + case AF_INET: |
| 210 | + return (inet_pton4(src, dst)); |
| 211 | +#ifndef NO_IPV6 |
| 212 | + case AF_INET6: |
| 213 | + return (inet_pton6(src, dst)); |
| 214 | +#endif |
| 215 | + default: |
| 216 | + errno = EAFNOSUPPORT; |
| 217 | + return (-1); |
| 218 | + } |
| 219 | + /* NOTREACHED */ |
| 220 | +} |
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