1 /* 2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (c) 1996,1999 by Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/cdefs.h> 19 #include <sys/param.h> 20 #include <sys/socket.h> 21 #include <sys/systm.h> 22 23 #include <netinet/in.h> 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 30 static int inet_pton4(const char *src, u_char *dst); 31 static int inet_pton6(const char *src, u_char *dst); 32 33 /* int 34 * inet_pton(af, src, dst) 35 * convert from presentation format (which usually means ASCII printable) 36 * to network format (which is usually some kind of binary format). 37 * return: 38 * 1 if the address was valid for the specified address family 39 * 0 if the address wasn't valid (`dst' is untouched in this case) 40 * -1 if some other error occurred (`dst' is untouched in this case, too) 41 * author: 42 * Paul Vixie, 1996. 43 */ 44 int 45 inet_pton(int af, const char *src, void *dst) 46 { 47 switch (af) { 48 case AF_INET: 49 return (inet_pton4(src, dst)); 50 case AF_INET6: 51 return (inet_pton6(src, dst)); 52 default: 53 return (-1); 54 } 55 /* NOTREACHED */ 56 } 57 58 /* int 59 * inet_pton4(src, dst) 60 * like inet_aton() but without all the hexadecimal and shorthand. 61 * return: 62 * 1 if `src' is a valid dotted quad, else 0. 63 * notice: 64 * does not touch `dst' unless it's returning 1. 65 * author: 66 * Paul Vixie, 1996. 67 */ 68 static int 69 inet_pton4(const char *src, u_char *dst) 70 { 71 static const char digits[] = "0123456789"; 72 int saw_digit, octets, ch; 73 #define NS_INADDRSZ 4 74 u_char tmp[NS_INADDRSZ], *tp; 75 76 saw_digit = 0; 77 octets = 0; 78 *(tp = tmp) = 0; 79 while ((ch = *src++) != '\0') { 80 const char *pch; 81 82 if ((pch = strchr(digits, ch)) != NULL) { 83 u_int new = *tp * 10 + (pch - digits); 84 85 if (saw_digit && *tp == 0) 86 return (0); 87 if (new > 255) 88 return (0); 89 *tp = new; 90 if (!saw_digit) { 91 if (++octets > 4) 92 return (0); 93 saw_digit = 1; 94 } 95 } else if (ch == '.' && saw_digit) { 96 if (octets == 4) 97 return (0); 98 *++tp = 0; 99 saw_digit = 0; 100 } else 101 return (0); 102 } 103 if (octets < 4) 104 return (0); 105 memcpy(dst, tmp, NS_INADDRSZ); 106 return (1); 107 } 108 109 /* int 110 * inet_pton6(src, dst) 111 * convert presentation level address to network order binary form. 112 * return: 113 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 114 * notice: 115 * (1) does not touch `dst' unless it's returning 1. 116 * (2) :: in a full address is silently ignored. 117 * credit: 118 * inspired by Mark Andrews. 119 * author: 120 * Paul Vixie, 1996. 121 */ 122 static int 123 inet_pton6(const char *src, u_char *dst) 124 { 125 static const char xdigits_l[] = "0123456789abcdef", 126 xdigits_u[] = "0123456789ABCDEF"; 127 #define NS_IN6ADDRSZ 16 128 #define NS_INT16SZ 2 129 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 130 const char *xdigits, *curtok; 131 int ch, seen_xdigits; 132 u_int val; 133 134 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 135 endp = tp + NS_IN6ADDRSZ; 136 colonp = NULL; 137 /* Leading :: requires some special handling. */ 138 if (*src == ':') 139 if (*++src != ':') 140 return (0); 141 curtok = src; 142 seen_xdigits = 0; 143 val = 0; 144 while ((ch = *src++) != '\0') { 145 const char *pch; 146 147 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 148 pch = strchr((xdigits = xdigits_u), ch); 149 if (pch != NULL) { 150 val <<= 4; 151 val |= (pch - xdigits); 152 if (++seen_xdigits > 4) 153 return (0); 154 continue; 155 } 156 if (ch == ':') { 157 curtok = src; 158 if (!seen_xdigits) { 159 if (colonp) 160 return (0); 161 colonp = tp; 162 continue; 163 } else if (*src == '\0') { 164 return (0); 165 } 166 if (tp + NS_INT16SZ > endp) 167 return (0); 168 *tp++ = (u_char) (val >> 8) & 0xff; 169 *tp++ = (u_char) val & 0xff; 170 seen_xdigits = 0; 171 val = 0; 172 continue; 173 } 174 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 175 inet_pton4(curtok, tp) > 0) { 176 tp += NS_INADDRSZ; 177 seen_xdigits = 0; 178 break; /*%< '\\0' was seen by inet_pton4(). */ 179 } 180 return (0); 181 } 182 if (seen_xdigits) { 183 if (tp + NS_INT16SZ > endp) 184 return (0); 185 *tp++ = (u_char) (val >> 8) & 0xff; 186 *tp++ = (u_char) val & 0xff; 187 } 188 if (colonp != NULL) { 189 /* 190 * Since some memmove()'s erroneously fail to handle 191 * overlapping regions, we'll do the shift by hand. 192 */ 193 const int n = tp - colonp; 194 int i; 195 196 if (tp == endp) 197 return (0); 198 for (i = 1; i <= n; i++) { 199 endp[- i] = colonp[n - i]; 200 colonp[n - i] = 0; 201 } 202 tp = endp; 203 } 204 if (tp != endp) 205 return (0); 206 memcpy(dst, tmp, NS_IN6ADDRSZ); 207 return (1); 208 } 209 210 /*! \file */ 211