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 #if defined(LIBC_SCCS) && !defined(lint) 19 static const char rcsid[] = "$Id: inet_pton.c,v 1.3.18.2 2005/07/28 07:38:07 marka Exp $"; 20 #endif /* LIBC_SCCS and not lint */ 21 #include <sys/cdefs.h> 22 #include <sys/param.h> 23 #include <sys/socket.h> 24 #include <sys/systm.h> 25 26 #include <netinet/in.h> 27 28 /*% 29 * WARNING: Don't even consider trying to compile this on a system where 30 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 31 */ 32 33 static int inet_pton4(const char *src, u_char *dst); 34 static int inet_pton6(const char *src, u_char *dst); 35 36 /* int 37 * inet_pton(af, src, dst) 38 * convert from presentation format (which usually means ASCII printable) 39 * to network format (which is usually some kind of binary format). 40 * return: 41 * 1 if the address was valid for the specified address family 42 * 0 if the address wasn't valid (`dst' is untouched in this case) 43 * -1 if some other error occurred (`dst' is untouched in this case, too) 44 * author: 45 * Paul Vixie, 1996. 46 */ 47 int 48 inet_pton(int af, const char *src, void *dst) 49 { 50 switch (af) { 51 case AF_INET: 52 return (inet_pton4(src, dst)); 53 case AF_INET6: 54 return (inet_pton6(src, dst)); 55 default: 56 return (-1); 57 } 58 /* NOTREACHED */ 59 } 60 61 /* int 62 * inet_pton4(src, dst) 63 * like inet_aton() but without all the hexadecimal and shorthand. 64 * return: 65 * 1 if `src' is a valid dotted quad, else 0. 66 * notice: 67 * does not touch `dst' unless it's returning 1. 68 * author: 69 * Paul Vixie, 1996. 70 */ 71 static int 72 inet_pton4(const char *src, u_char *dst) 73 { 74 static const char digits[] = "0123456789"; 75 int saw_digit, octets, ch; 76 #define NS_INADDRSZ 4 77 u_char tmp[NS_INADDRSZ], *tp; 78 79 saw_digit = 0; 80 octets = 0; 81 *(tp = tmp) = 0; 82 while ((ch = *src++) != '\0') { 83 const char *pch; 84 85 if ((pch = strchr(digits, ch)) != NULL) { 86 u_int new = *tp * 10 + (pch - digits); 87 88 if (saw_digit && *tp == 0) 89 return (0); 90 if (new > 255) 91 return (0); 92 *tp = new; 93 if (!saw_digit) { 94 if (++octets > 4) 95 return (0); 96 saw_digit = 1; 97 } 98 } else if (ch == '.' && saw_digit) { 99 if (octets == 4) 100 return (0); 101 *++tp = 0; 102 saw_digit = 0; 103 } else 104 return (0); 105 } 106 if (octets < 4) 107 return (0); 108 memcpy(dst, tmp, NS_INADDRSZ); 109 return (1); 110 } 111 112 /* int 113 * inet_pton6(src, dst) 114 * convert presentation level address to network order binary form. 115 * return: 116 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 117 * notice: 118 * (1) does not touch `dst' unless it's returning 1. 119 * (2) :: in a full address is silently ignored. 120 * credit: 121 * inspired by Mark Andrews. 122 * author: 123 * Paul Vixie, 1996. 124 */ 125 static int 126 inet_pton6(const char *src, u_char *dst) 127 { 128 static const char xdigits_l[] = "0123456789abcdef", 129 xdigits_u[] = "0123456789ABCDEF"; 130 #define NS_IN6ADDRSZ 16 131 #define NS_INT16SZ 2 132 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 133 const char *xdigits, *curtok; 134 int ch, seen_xdigits; 135 u_int val; 136 137 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 138 endp = tp + NS_IN6ADDRSZ; 139 colonp = NULL; 140 /* Leading :: requires some special handling. */ 141 if (*src == ':') 142 if (*++src != ':') 143 return (0); 144 curtok = src; 145 seen_xdigits = 0; 146 val = 0; 147 while ((ch = *src++) != '\0') { 148 const char *pch; 149 150 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 151 pch = strchr((xdigits = xdigits_u), ch); 152 if (pch != NULL) { 153 val <<= 4; 154 val |= (pch - xdigits); 155 if (++seen_xdigits > 4) 156 return (0); 157 continue; 158 } 159 if (ch == ':') { 160 curtok = src; 161 if (!seen_xdigits) { 162 if (colonp) 163 return (0); 164 colonp = tp; 165 continue; 166 } else if (*src == '\0') { 167 return (0); 168 } 169 if (tp + NS_INT16SZ > endp) 170 return (0); 171 *tp++ = (u_char) (val >> 8) & 0xff; 172 *tp++ = (u_char) val & 0xff; 173 seen_xdigits = 0; 174 val = 0; 175 continue; 176 } 177 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 178 inet_pton4(curtok, tp) > 0) { 179 tp += NS_INADDRSZ; 180 seen_xdigits = 0; 181 break; /*%< '\\0' was seen by inet_pton4(). */ 182 } 183 return (0); 184 } 185 if (seen_xdigits) { 186 if (tp + NS_INT16SZ > endp) 187 return (0); 188 *tp++ = (u_char) (val >> 8) & 0xff; 189 *tp++ = (u_char) val & 0xff; 190 } 191 if (colonp != NULL) { 192 /* 193 * Since some memmove()'s erroneously fail to handle 194 * overlapping regions, we'll do the shift by hand. 195 */ 196 const int n = tp - colonp; 197 int i; 198 199 if (tp == endp) 200 return (0); 201 for (i = 1; i <= n; i++) { 202 endp[- i] = colonp[n - i]; 203 colonp[n - i] = 0; 204 } 205 tp = endp; 206 } 207 if (tp != endp) 208 return (0); 209 memcpy(dst, tmp, NS_IN6ADDRSZ); 210 return (1); 211 } 212 213 /*! \file */ 214