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 #if __FreeBSD_version < 700000 31 #define strchr index 32 #endif 33 34 /*% 35 * WARNING: Don't even consider trying to compile this on a system where 36 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 37 */ 38 39 static int inet_pton4(const char *src, u_char *dst); 40 static int inet_pton6(const char *src, u_char *dst); 41 42 /* int 43 * inet_pton(af, src, dst) 44 * convert from presentation format (which usually means ASCII printable) 45 * to network format (which is usually some kind of binary format). 46 * return: 47 * 1 if the address was valid for the specified address family 48 * 0 if the address wasn't valid (`dst' is untouched in this case) 49 * -1 if some other error occurred (`dst' is untouched in this case, too) 50 * author: 51 * Paul Vixie, 1996. 52 */ 53 int 54 inet_pton(int af, const char *src, void *dst) 55 { 56 switch (af) { 57 case AF_INET: 58 return (inet_pton4(src, dst)); 59 case AF_INET6: 60 return (inet_pton6(src, dst)); 61 default: 62 return (-1); 63 } 64 /* NOTREACHED */ 65 } 66 67 /* int 68 * inet_pton4(src, dst) 69 * like inet_aton() but without all the hexadecimal and shorthand. 70 * return: 71 * 1 if `src' is a valid dotted quad, else 0. 72 * notice: 73 * does not touch `dst' unless it's returning 1. 74 * author: 75 * Paul Vixie, 1996. 76 */ 77 static int 78 inet_pton4(const char *src, u_char *dst) 79 { 80 static const char digits[] = "0123456789"; 81 int saw_digit, octets, ch; 82 #define NS_INADDRSZ 4 83 u_char tmp[NS_INADDRSZ], *tp; 84 85 saw_digit = 0; 86 octets = 0; 87 *(tp = tmp) = 0; 88 while ((ch = *src++) != '\0') { 89 const char *pch; 90 91 if ((pch = strchr(digits, ch)) != NULL) { 92 u_int new = *tp * 10 + (pch - digits); 93 94 if (saw_digit && *tp == 0) 95 return (0); 96 if (new > 255) 97 return (0); 98 *tp = new; 99 if (!saw_digit) { 100 if (++octets > 4) 101 return (0); 102 saw_digit = 1; 103 } 104 } else if (ch == '.' && saw_digit) { 105 if (octets == 4) 106 return (0); 107 *++tp = 0; 108 saw_digit = 0; 109 } else 110 return (0); 111 } 112 if (octets < 4) 113 return (0); 114 memcpy(dst, tmp, NS_INADDRSZ); 115 return (1); 116 } 117 118 /* int 119 * inet_pton6(src, dst) 120 * convert presentation level address to network order binary form. 121 * return: 122 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 123 * notice: 124 * (1) does not touch `dst' unless it's returning 1. 125 * (2) :: in a full address is silently ignored. 126 * credit: 127 * inspired by Mark Andrews. 128 * author: 129 * Paul Vixie, 1996. 130 */ 131 static int 132 inet_pton6(const char *src, u_char *dst) 133 { 134 static const char xdigits_l[] = "0123456789abcdef", 135 xdigits_u[] = "0123456789ABCDEF"; 136 #define NS_IN6ADDRSZ 16 137 #define NS_INT16SZ 2 138 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 139 const char *xdigits, *curtok; 140 int ch, seen_xdigits; 141 u_int val; 142 143 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 144 endp = tp + NS_IN6ADDRSZ; 145 colonp = NULL; 146 /* Leading :: requires some special handling. */ 147 if (*src == ':') 148 if (*++src != ':') 149 return (0); 150 curtok = src; 151 seen_xdigits = 0; 152 val = 0; 153 while ((ch = *src++) != '\0') { 154 const char *pch; 155 156 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 157 pch = strchr((xdigits = xdigits_u), ch); 158 if (pch != NULL) { 159 val <<= 4; 160 val |= (pch - xdigits); 161 if (++seen_xdigits > 4) 162 return (0); 163 continue; 164 } 165 if (ch == ':') { 166 curtok = src; 167 if (!seen_xdigits) { 168 if (colonp) 169 return (0); 170 colonp = tp; 171 continue; 172 } else if (*src == '\0') { 173 return (0); 174 } 175 if (tp + NS_INT16SZ > endp) 176 return (0); 177 *tp++ = (u_char) (val >> 8) & 0xff; 178 *tp++ = (u_char) val & 0xff; 179 seen_xdigits = 0; 180 val = 0; 181 continue; 182 } 183 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 184 inet_pton4(curtok, tp) > 0) { 185 tp += NS_INADDRSZ; 186 seen_xdigits = 0; 187 break; /*%< '\\0' was seen by inet_pton4(). */ 188 } 189 return (0); 190 } 191 if (seen_xdigits) { 192 if (tp + NS_INT16SZ > endp) 193 return (0); 194 *tp++ = (u_char) (val >> 8) & 0xff; 195 *tp++ = (u_char) val & 0xff; 196 } 197 if (colonp != NULL) { 198 /* 199 * Since some memmove()'s erroneously fail to handle 200 * overlapping regions, we'll do the shift by hand. 201 */ 202 const int n = tp - colonp; 203 int i; 204 205 if (tp == endp) 206 return (0); 207 for (i = 1; i <= n; i++) { 208 endp[- i] = colonp[n - i]; 209 colonp[n - i] = 0; 210 } 211 tp = endp; 212 } 213 if (tp != endp) 214 return (0); 215 memcpy(dst, tmp, NS_IN6ADDRSZ); 216 return (1); 217 } 218 219 /*! \file */ 220