[337] | 1 | /* This is from the BIND 4.9.4 release, modified to compile by itself */
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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 "curl_setup.h"
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| 20 |
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| 21 | #ifndef HAVE_INET_PTON
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| 22 |
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| 23 | #ifdef HAVE_SYS_PARAM_H
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| 24 | #include <sys/param.h>
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| 25 | #endif
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| 26 | #ifdef HAVE_NETINET_IN_H
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| 27 | #include <netinet/in.h>
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| 28 | #endif
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| 29 | #ifdef HAVE_ARPA_INET_H
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| 30 | #include <arpa/inet.h>
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| 31 | #endif
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| 32 |
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| 33 | #include "inet_pton.h"
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| 34 |
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| 35 | #define IN6ADDRSZ 16
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| 36 | #define INADDRSZ 4
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| 37 | #define INT16SZ 2
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| 38 |
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| 39 | /*
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| 40 | * WARNING: Don't even consider trying to compile this on a system where
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| 41 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
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| 42 | */
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| 43 |
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| 44 | static int inet_pton4(const char *src, unsigned char *dst);
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| 45 | #ifdef ENABLE_IPV6
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| 46 | static int inet_pton6(const char *src, unsigned char *dst);
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| 47 | #endif
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| 48 |
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| 49 | /* int
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| 50 | * inet_pton(af, src, dst)
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| 51 | * convert from presentation format (which usually means ASCII printable)
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| 52 | * to network format (which is usually some kind of binary format).
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| 53 | * return:
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| 54 | * 1 if the address was valid for the specified address family
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| 55 | * 0 if the address wasn't valid (`dst' is untouched in this case)
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| 56 | * -1 if some other error occurred (`dst' is untouched in this case, too)
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| 57 | * notice:
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| 58 | * On Windows we store the error in the thread errno, not
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| 59 | * in the winsock error code. This is to avoid losing the
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| 60 | * actual last winsock error. So when this function returns
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| 61 | * -1, check errno not SOCKERRNO.
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| 62 | * author:
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| 63 | * Paul Vixie, 1996.
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| 64 | */
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| 65 | int
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| 66 | Curl_inet_pton(int af, const char *src, void *dst)
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| 67 | {
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| 68 | switch(af) {
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| 69 | case AF_INET:
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| 70 | return (inet_pton4(src, (unsigned char *)dst));
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| 71 | #ifdef ENABLE_IPV6
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| 72 | case AF_INET6:
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| 73 | return (inet_pton6(src, (unsigned char *)dst));
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| 74 | #endif
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| 75 | default:
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| 76 | errno = EAFNOSUPPORT;
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| 77 | return (-1);
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| 78 | }
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| 79 | /* NOTREACHED */
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| 80 | }
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| 81 |
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| 82 | /* int
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| 83 | * inet_pton4(src, dst)
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| 84 | * like inet_aton() but without all the hexadecimal and shorthand.
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| 85 | * return:
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| 86 | * 1 if `src' is a valid dotted quad, else 0.
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| 87 | * notice:
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| 88 | * does not touch `dst' unless it's returning 1.
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| 89 | * author:
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| 90 | * Paul Vixie, 1996.
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| 91 | */
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| 92 | static int
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| 93 | inet_pton4(const char *src, unsigned char *dst)
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| 94 | {
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| 95 | static const char digits[] = "0123456789";
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| 96 | int saw_digit, octets, ch;
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| 97 | unsigned char tmp[INADDRSZ], *tp;
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| 98 |
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| 99 | saw_digit = 0;
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| 100 | octets = 0;
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| 101 | tp = tmp;
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| 102 | *tp = 0;
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| 103 | while((ch = *src++) != '\0') {
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| 104 | const char *pch;
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| 105 |
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| 106 | pch = strchr(digits, ch);
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| 107 | if(pch) {
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| 108 | unsigned int val = *tp * 10 + (unsigned int)(pch - digits);
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| 109 |
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| 110 | if(saw_digit && *tp == 0)
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| 111 | return (0);
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| 112 | if(val > 255)
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| 113 | return (0);
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| 114 | *tp = (unsigned char)val;
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| 115 | if(! saw_digit) {
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| 116 | if(++octets > 4)
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| 117 | return (0);
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| 118 | saw_digit = 1;
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| 119 | }
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| 120 | }
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| 121 | else if(ch == '.' && saw_digit) {
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| 122 | if(octets == 4)
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| 123 | return (0);
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| 124 | *++tp = 0;
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| 125 | saw_digit = 0;
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| 126 | }
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| 127 | else
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| 128 | return (0);
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| 129 | }
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| 130 | if(octets < 4)
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| 131 | return (0);
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| 132 | memcpy(dst, tmp, INADDRSZ);
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| 133 | return (1);
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| 134 | }
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| 135 |
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| 136 | #ifdef ENABLE_IPV6
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| 137 | /* int
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| 138 | * inet_pton6(src, dst)
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| 139 | * convert presentation level address to network order binary form.
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| 140 | * return:
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| 141 | * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
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| 142 | * notice:
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| 143 | * (1) does not touch `dst' unless it's returning 1.
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| 144 | * (2) :: in a full address is silently ignored.
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| 145 | * credit:
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| 146 | * inspired by Mark Andrews.
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| 147 | * author:
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| 148 | * Paul Vixie, 1996.
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| 149 | */
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| 150 | static int
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| 151 | inet_pton6(const char *src, unsigned char *dst)
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| 152 | {
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| 153 | static const char xdigits_l[] = "0123456789abcdef",
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| 154 | xdigits_u[] = "0123456789ABCDEF";
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| 155 | unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
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| 156 | const char *xdigits, *curtok;
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| 157 | int ch, saw_xdigit;
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| 158 | size_t val;
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| 159 |
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| 160 | memset((tp = tmp), 0, IN6ADDRSZ);
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| 161 | endp = tp + IN6ADDRSZ;
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| 162 | colonp = NULL;
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| 163 | /* Leading :: requires some special handling. */
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| 164 | if(*src == ':')
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| 165 | if(*++src != ':')
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| 166 | return (0);
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| 167 | curtok = src;
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| 168 | saw_xdigit = 0;
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| 169 | val = 0;
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| 170 | while((ch = *src++) != '\0') {
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| 171 | const char *pch;
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| 172 |
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| 173 | pch = strchr((xdigits = xdigits_l), ch);
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| 174 | if(!pch)
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| 175 | pch = strchr((xdigits = xdigits_u), ch);
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| 176 | if(pch != NULL) {
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| 177 | val <<= 4;
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| 178 | val |= (pch - xdigits);
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| 179 | if(++saw_xdigit > 4)
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| 180 | return (0);
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| 181 | continue;
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| 182 | }
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| 183 | if(ch == ':') {
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| 184 | curtok = src;
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| 185 | if(!saw_xdigit) {
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| 186 | if(colonp)
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| 187 | return (0);
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| 188 | colonp = tp;
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| 189 | continue;
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| 190 | }
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| 191 | if(tp + INT16SZ > endp)
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| 192 | return (0);
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| 193 | *tp++ = (unsigned char) ((val >> 8) & 0xff);
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| 194 | *tp++ = (unsigned char) (val & 0xff);
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| 195 | saw_xdigit = 0;
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| 196 | val = 0;
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| 197 | continue;
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| 198 | }
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| 199 | if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
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| 200 | inet_pton4(curtok, tp) > 0) {
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| 201 | tp += INADDRSZ;
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| 202 | saw_xdigit = 0;
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| 203 | break; /* '\0' was seen by inet_pton4(). */
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| 204 | }
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| 205 | return (0);
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| 206 | }
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| 207 | if(saw_xdigit) {
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| 208 | if(tp + INT16SZ > endp)
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| 209 | return (0);
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| 210 | *tp++ = (unsigned char) ((val >> 8) & 0xff);
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| 211 | *tp++ = (unsigned char) (val & 0xff);
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| 212 | }
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| 213 | if(colonp != NULL) {
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| 214 | /*
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| 215 | * Since some memmove()'s erroneously fail to handle
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| 216 | * overlapping regions, we'll do the shift by hand.
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| 217 | */
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| 218 | const ssize_t n = tp - colonp;
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| 219 | ssize_t i;
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| 220 |
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| 221 | if(tp == endp)
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| 222 | return (0);
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| 223 | for(i = 1; i <= n; i++) {
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| 224 | *(endp - i) = *(colonp + n - i);
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| 225 | *(colonp + n - i) = 0;
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| 226 | }
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| 227 | tp = endp;
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| 228 | }
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| 229 | if(tp != endp)
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| 230 | return (0);
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| 231 | memcpy(dst, tmp, IN6ADDRSZ);
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| 232 | return (1);
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| 233 | }
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| 234 | #endif /* ENABLE_IPV6 */
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| 235 |
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| 236 | #endif /* HAVE_INET_PTON */
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