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 $"; 20 #endif /* LIBC_SCCS and not lint */ 21 #include <sys/cdefs.h> 22 __FBSDID("$FreeBSD$"); 23 24 #include <sys/param.h> 25 #include <sys/socket.h> 26 #include <sys/systm.h> 27 28 #include <netinet/in.h> 29 30 /*% 31 * WARNING: Don't even consider trying to compile this on a system where 32 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 33 */ 34 35 static int inet_pton4(const char *src, u_char *dst); 36 static int inet_pton6(const char *src, u_char *dst); 37 38 /* int 39 * inet_pton(af, src, dst) 40 * convert from presentation format (which usually means ASCII printable) 41 * to network format (which is usually some kind of binary format). 42 * return: 43 * 1 if the address was valid for the specified address family 44 * 0 if the address wasn't valid (`dst' is untouched in this case) 45 * -1 if some other error occurred (`dst' is untouched in this case, too) 46 * author: 47 * Paul Vixie, 1996. 48 */ 49 int 50 inet_pton(int af, const char *src, void *dst) 51 { 52 switch (af) { 53 case AF_INET: 54 return (inet_pton4(src, dst)); 55 case AF_INET6: 56 return (inet_pton6(src, dst)); 57 default: 58 return (-1); 59 } 60 /* NOTREACHED */ 61 } 62 63 /* int 64 * inet_pton4(src, dst) 65 * like inet_aton() but without all the hexadecimal and shorthand. 66 * return: 67 * 1 if `src' is a valid dotted quad, else 0. 68 * notice: 69 * does not touch `dst' unless it's returning 1. 70 * author: 71 * Paul Vixie, 1996. 72 */ 73 static int 74 inet_pton4(const char *src, u_char *dst) 75 { 76 static const char digits[] = "0123456789"; 77 int saw_digit, octets, ch; 78 #define NS_INADDRSZ 4 79 u_char tmp[NS_INADDRSZ], *tp; 80 81 saw_digit = 0; 82 octets = 0; 83 *(tp = tmp) = 0; 84 while ((ch = *src++) != '\0') { 85 const char *pch; 86 87 if ((pch = strchr(digits, ch)) != NULL) { 88 u_int new = *tp * 10 + (pch - digits); 89 90 if (saw_digit && *tp == 0) 91 return (0); 92 if (new > 255) 93 return (0); 94 *tp = new; 95 if (!saw_digit) { 96 if (++octets > 4) 97 return (0); 98 saw_digit = 1; 99 } 100 } else if (ch == '.' && saw_digit) { 101 if (octets == 4) 102 return (0); 103 *++tp = 0; 104 saw_digit = 0; 105 } else 106 return (0); 107 } 108 if (octets < 4) 109 return (0); 110 memcpy(dst, tmp, NS_INADDRSZ); 111 return (1); 112 } 113 114 /* int 115 * inet_pton6(src, dst) 116 * convert presentation level address to network order binary form. 117 * return: 118 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 119 * notice: 120 * (1) does not touch `dst' unless it's returning 1. 121 * (2) :: in a full address is silently ignored. 122 * credit: 123 * inspired by Mark Andrews. 124 * author: 125 * Paul Vixie, 1996. 126 */ 127 static int 128 inet_pton6(const char *src, u_char *dst) 129 { 130 static const char xdigits_l[] = "0123456789abcdef", 131 xdigits_u[] = "0123456789ABCDEF"; 132 #define NS_IN6ADDRSZ 16 133 #define NS_INT16SZ 2 134 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 135 const char *xdigits, *curtok; 136 int ch, seen_xdigits; 137 u_int val; 138 139 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 140 endp = tp + NS_IN6ADDRSZ; 141 colonp = NULL; 142 /* Leading :: requires some special handling. */ 143 if (*src == ':') 144 if (*++src != ':') 145 return (0); 146 curtok = src; 147 seen_xdigits = 0; 148 val = 0; 149 while ((ch = *src++) != '\0') { 150 const char *pch; 151 152 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 153 pch = strchr((xdigits = xdigits_u), ch); 154 if (pch != NULL) { 155 val <<= 4; 156 val |= (pch - xdigits); 157 if (++seen_xdigits > 4) 158 return (0); 159 continue; 160 } 161 if (ch == ':') { 162 curtok = src; 163 if (!seen_xdigits) { 164 if (colonp) 165 return (0); 166 colonp = tp; 167 continue; 168 } else if (*src == '\0') { 169 return (0); 170 } 171 if (tp + NS_INT16SZ > endp) 172 return (0); 173 *tp++ = (u_char) (val >> 8) & 0xff; 174 *tp++ = (u_char) val & 0xff; 175 seen_xdigits = 0; 176 val = 0; 177 continue; 178 } 179 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 180 inet_pton4(curtok, tp) > 0) { 181 tp += NS_INADDRSZ; 182 seen_xdigits = 0; 183 break; /*%< '\\0' was seen by inet_pton4(). */ 184 } 185 return (0); 186 } 187 if (seen_xdigits) { 188 if (tp + NS_INT16SZ > endp) 189 return (0); 190 *tp++ = (u_char) (val >> 8) & 0xff; 191 *tp++ = (u_char) val & 0xff; 192 } 193 if (colonp != NULL) { 194 /* 195 * Since some memmove()'s erroneously fail to handle 196 * overlapping regions, we'll do the shift by hand. 197 */ 198 const int n = tp - colonp; 199 int i; 200 201 if (tp == endp) 202 return (0); 203 for (i = 1; i <= n; i++) { 204 endp[- i] = colonp[n - i]; 205 colonp[n - i] = 0; 206 } 207 tp = endp; 208 } 209 if (tp != endp) 210 return (0); 211 memcpy(dst, tmp, NS_IN6ADDRSZ); 212 return (1); 213 } 214 215 /*! \file */ 216