[444] | 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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