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 "replace.h" 19#include "system/network.h" 20 21#define NS_INT16SZ 2 22#define NS_INADDRSZ 4 23#define NS_IN6ADDRSZ 16 24 25/* 26 * WARNING: Don't even consider trying to compile this on a system where 27 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 28 */ 29 30static int inet_pton4(const char *src, unsigned char *dst); 31#ifdef AF_INET6 32static int inet_pton6(const char *src, unsigned char *dst); 33#endif 34 35/* int 36 * inet_pton(af, src, dst) 37 * convert from presentation format (which usually means ASCII printable) 38 * to network format (which is usually some kind of binary format). 39 * return: 40 * 1 if the address was valid for the specified address family 41 * 0 if the address wasn't valid (`dst' is untouched in this case) 42 * -1 if some other error occurred (`dst' is untouched in this case, too) 43 * author: 44 * Paul Vixie, 1996. 45 */ 46int 47rep_inet_pton(int af, 48 const char *src, 49 void *dst) 50{ 51 switch (af) { 52 case AF_INET: 53 return (inet_pton4(src, dst)); 54#ifdef AF_INET6 55 case AF_INET6: 56 return (inet_pton6(src, dst)); 57#endif 58 default: 59 errno = EAFNOSUPPORT; 60 return (-1); 61 } 62 /* NOTREACHED */ 63} 64 65/* int 66 * inet_pton4(src, dst) 67 * like inet_aton() but without all the hexadecimal and shorthand. 68 * return: 69 * 1 if `src' is a valid dotted quad, else 0. 70 * notice: 71 * does not touch `dst' unless it's returning 1. 72 * author: 73 * Paul Vixie, 1996. 74 */ 75static int 76inet_pton4(src, dst) 77 const char *src; 78 unsigned char *dst; 79{ 80 static const char digits[] = "0123456789"; 81 int saw_digit, octets, ch; 82 unsigned char tmp[NS_INADDRSZ], *tp; 83 84 saw_digit = 0; 85 octets = 0; 86 *(tp = tmp) = 0; 87 while ((ch = *src++) != '\0') { 88 const char *pch; 89 90 if ((pch = strchr(digits, ch)) != NULL) { 91 unsigned int new = *tp * 10 + (pch - digits); 92 93 if (new > 255) 94 return (0); 95 *tp = new; 96 if (! saw_digit) { 97 if (++octets > 4) 98 return (0); 99 saw_digit = 1; 100 } 101 } else if (ch == '.' && saw_digit) { 102 if (octets == 4) 103 return (0); 104 *++tp = 0; 105 saw_digit = 0; 106 } else 107 return (0); 108 } 109 if (octets < 4) 110 return (0); 111 memcpy(dst, tmp, NS_INADDRSZ); 112 return (1); 113} 114 115/* int 116 * inet_pton6(src, dst) 117 * convert presentation level address to network order binary form. 118 * return: 119 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 120 * notice: 121 * (1) does not touch `dst' unless it's returning 1. 122 * (2) :: in a full address is silently ignored. 123 * credit: 124 * inspired by Mark Andrews. 125 * author: 126 * Paul Vixie, 1996. 127 */ 128#ifdef AF_INET6 129static int 130inet_pton6(src, dst) 131 const char *src; 132 unsigned char *dst; 133{ 134 static const char xdigits_l[] = "0123456789abcdef", 135 xdigits_u[] = "0123456789ABCDEF"; 136 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 137 const char *xdigits, *curtok; 138 int ch, saw_xdigit; 139 unsigned int val; 140 141 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 142 endp = tp + NS_IN6ADDRSZ; 143 colonp = NULL; 144 /* Leading :: requires some special handling. */ 145 if (*src == ':') 146 if (*++src != ':') 147 return (0); 148 curtok = src; 149 saw_xdigit = 0; 150 val = 0; 151 while ((ch = *src++) != '\0') { 152 const char *pch; 153 154 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 155 pch = strchr((xdigits = xdigits_u), ch); 156 if (pch != NULL) { 157 val <<= 4; 158 val |= (pch - xdigits); 159 if (val > 0xffff) 160 return (0); 161 saw_xdigit = 1; 162 continue; 163 } 164 if (ch == ':') { 165 curtok = src; 166 if (!saw_xdigit) { 167 if (colonp) 168 return (0); 169 colonp = tp; 170 continue; 171 } 172 if (tp + NS_INT16SZ > endp) 173 return (0); 174 *tp++ = (unsigned char) (val >> 8) & 0xff; 175 *tp++ = (unsigned char) val & 0xff; 176 saw_xdigit = 0; 177 val = 0; 178 continue; 179 } 180 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 181 inet_pton4(curtok, tp) > 0) { 182 tp += NS_INADDRSZ; 183 saw_xdigit = 0; 184 break; /* '\0' was seen by inet_pton4(). */ 185 } 186 return (0); 187 } 188 if (saw_xdigit) { 189 if (tp + NS_INT16SZ > endp) 190 return (0); 191 *tp++ = (unsigned char) (val >> 8) & 0xff; 192 *tp++ = (unsigned char) val & 0xff; 193 } 194 if (colonp != NULL) { 195 /* 196 * Since some memmove()'s erroneously fail to handle 197 * overlapping regions, we'll do the shift by hand. 198 */ 199 const int n = tp - colonp; 200 int i; 201 202 for (i = 1; i <= n; i++) { 203 endp[- i] = colonp[n - i]; 204 colonp[n - i] = 0; 205 } 206 tp = endp; 207 } 208 if (tp != endp) 209 return (0); 210 memcpy(dst, tmp, NS_IN6ADDRSZ); 211 return (1); 212} 213#endif 214