[331] | 1 | /* $OpenBSD: inet_pton.c,v 1.9 2015/01/16 16:48:51 deraadt Exp $ */
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| 2 | // from https://raw.githubusercontent.com/libressl-portable/portable/master/crypto/compat/inet_pton.c
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| 3 |
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| 4 | /* Copyright (c) 1996 by Internet Software Consortium.
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| 5 | *
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| 6 | * Permission to use, copy, modify, and distribute this software for any
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| 7 | * purpose with or without fee is hereby granted, provided that the above
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| 8 | * copyright notice and this permission notice appear in all copies.
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| 9 | *
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| 10 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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| 11 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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| 12 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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| 13 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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| 14 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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| 15 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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| 16 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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| 17 | * SOFTWARE.
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| 18 | */
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| 19 | #ifdef _WIN32
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| 20 | #include <win32netcompat.h>
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| 21 | #include <sys/types.h>
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| 22 | #include <string.h>
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| 23 | #include <errno.h>
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| 24 |
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| 25 | /*
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| 26 | * WARNING: Don't even consider trying to compile this on a system where
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| 27 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
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| 28 | */
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| 29 |
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| 30 | static int inet_pton4(const char *src, u_char *dst);
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| 31 | static int inet_pton6(const char *src, u_char *dst);
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| 32 |
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| 33 | /* int
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| 34 | * inet_pton(af, src, dst)
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| 35 | * convert from presentation format (which usually means ASCII printable)
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| 36 | * to network format (which is usually some kind of binary format).
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| 37 | * return:
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| 38 | * 1 if the address was valid for the specified address family
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| 39 | * 0 if the address wasn't valid (`dst' is untouched in this case)
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| 40 | * -1 if some other error occurred (`dst' is untouched in this case, too)
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| 41 | * author:
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| 42 | * Paul Vixie, 1996.
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| 43 | */
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| 44 | int
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| 45 | inet_pton(int af, const char *src, void *dst)
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| 46 | {
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| 47 | switch (af) {
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| 48 | case AF_INET:
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| 49 | return (inet_pton4(src, dst));
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| 50 | case AF_INET6:
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| 51 | return (inet_pton6(src, dst));
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| 52 | default:
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| 53 | errno = EAFNOSUPPORT;
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| 54 | return (-1);
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| 55 | }
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| 56 | /* NOTREACHED */
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| 57 | }
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| 58 |
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| 59 | /* int
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| 60 | * inet_pton4(src, dst)
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| 61 | * like inet_aton() but without all the hexadecimal and shorthand.
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| 62 | * return:
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| 63 | * 1 if `src' is a valid dotted quad, else 0.
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| 64 | * notice:
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| 65 | * does not touch `dst' unless it's returning 1.
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| 66 | * author:
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| 67 | * Paul Vixie, 1996.
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| 68 | */
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| 69 | static int
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| 70 | inet_pton4(const char *src, u_char *dst)
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| 71 | {
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| 72 | static const char digits[] = "0123456789";
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| 73 | int saw_digit, octets, ch;
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| 74 | u_char tmp[INADDRSZ], *tp;
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| 75 |
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| 76 | saw_digit = 0;
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| 77 | octets = 0;
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| 78 | *(tp = tmp) = 0;
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| 79 | while ((ch = *src++) != '\0') {
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| 80 | const char *pch;
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| 81 |
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| 82 | if ((pch = strchr(digits, ch)) != NULL) {
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| 83 | u_int new = *tp * 10 + (pch - digits);
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| 84 |
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| 85 | if (new > 255)
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| 86 | return (0);
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| 87 | if (! saw_digit) {
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| 88 | if (++octets > 4)
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| 89 | return (0);
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| 90 | saw_digit = 1;
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| 91 | }
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| 92 | *tp = new;
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| 93 | } else if (ch == '.' && saw_digit) {
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| 94 | if (octets == 4)
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| 95 | return (0);
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| 96 | *++tp = 0;
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| 97 | saw_digit = 0;
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| 98 | } else
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| 99 | return (0);
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| 100 | }
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| 101 | if (octets < 4)
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| 102 | return (0);
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| 103 |
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| 104 | memcpy(dst, tmp, INADDRSZ);
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| 105 | return (1);
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| 106 | }
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| 107 |
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| 108 | /* int
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| 109 | * inet_pton6(src, dst)
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| 110 | * convert presentation level address to network order binary form.
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| 111 | * return:
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| 112 | * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
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| 113 | * notice:
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| 114 | * does not touch `dst' unless it's returning 1.
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| 115 | * credit:
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| 116 | * inspired by Mark Andrews.
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| 117 | * author:
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| 118 | * Paul Vixie, 1996.
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| 119 | */
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| 120 | static int
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| 121 | inet_pton6(const char *src, u_char *dst)
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| 122 | {
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| 123 | static const char xdigits_l[] = "0123456789abcdef",
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| 124 | xdigits_u[] = "0123456789ABCDEF";
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| 125 | u_char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
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| 126 | const char *xdigits, *curtok;
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| 127 | int ch, saw_xdigit, count_xdigit;
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| 128 | u_int val;
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| 129 |
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| 130 | memset((tp = tmp), '\0', IN6ADDRSZ);
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| 131 | endp = tp + IN6ADDRSZ;
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| 132 | colonp = NULL;
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| 133 | /* Leading :: requires some special handling. */
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| 134 | if (*src == ':')
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| 135 | if (*++src != ':')
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| 136 | return (0);
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| 137 | curtok = src;
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| 138 | saw_xdigit = count_xdigit = 0;
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| 139 | val = 0;
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| 140 | while ((ch = *src++) != '\0') {
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| 141 | const char *pch;
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| 142 |
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| 143 | if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
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| 144 | pch = strchr((xdigits = xdigits_u), ch);
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| 145 | if (pch != NULL) {
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| 146 | if (count_xdigit >= 4)
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| 147 | return (0);
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| 148 | val <<= 4;
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| 149 | val |= (pch - xdigits);
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| 150 | if (val > 0xffff)
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| 151 | return (0);
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| 152 | saw_xdigit = 1;
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| 153 | count_xdigit++;
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| 154 | continue;
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| 155 | }
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| 156 | if (ch == ':') {
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| 157 | curtok = src;
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| 158 | if (!saw_xdigit) {
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| 159 | if (colonp)
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| 160 | return (0);
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| 161 | colonp = tp;
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| 162 | continue;
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| 163 | } else if (*src == '\0') {
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| 164 | return (0);
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| 165 | }
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| 166 | if (tp + INT16SZ > endp)
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| 167 | return (0);
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| 168 | *tp++ = (u_char) (val >> 8) & 0xff;
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| 169 | *tp++ = (u_char) val & 0xff;
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| 170 | saw_xdigit = 0;
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| 171 | count_xdigit = 0;
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| 172 | val = 0;
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| 173 | continue;
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| 174 | }
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| 175 | if (ch == '.' && ((tp + INADDRSZ) <= endp) &&
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| 176 | inet_pton4(curtok, tp) > 0) {
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| 177 | tp += INADDRSZ;
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| 178 | saw_xdigit = 0;
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| 179 | count_xdigit = 0;
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| 180 | break; /* '\0' was seen by inet_pton4(). */
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| 181 | }
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| 182 | return (0);
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| 183 | }
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| 184 | if (saw_xdigit) {
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| 185 | if (tp + INT16SZ > endp)
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| 186 | return (0);
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| 187 | *tp++ = (u_char) (val >> 8) & 0xff;
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| 188 | *tp++ = (u_char) val & 0xff;
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| 189 | }
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| 190 | if (colonp != NULL) {
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| 191 | /*
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| 192 | * Since some memmove()'s erroneously fail to handle
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| 193 | * overlapping regions, we'll do the shift by hand.
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| 194 | */
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| 195 | const int n = tp - colonp;
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| 196 | int i;
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| 197 |
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| 198 | if (tp == endp)
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| 199 | return (0);
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| 200 | for (i = 1; i <= n; i++) {
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| 201 | endp[- i] = colonp[n - i];
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| 202 | colonp[n - i] = 0;
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| 203 | }
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| 204 | tp = endp;
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| 205 | }
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| 206 | if (tp != endp)
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| 207 | return (0);
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| 208 | memcpy(dst, tmp, IN6ADDRSZ);
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| 209 | return (1);
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| 210 | }
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| 211 | #endif
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