1 /* $NetBSD: lwinetpton.c,v 1.6 2014/12/10 04:38:02 christos Exp $ */ 2 3 /* 4 * Copyright (C) 2004, 2005, 2007, 2011-2014 Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (C) 1996-2001 Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 17 * PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /*! \file lwinetpton.c 21 */ 22 23 #if defined(LIBC_SCCS) && !defined(lint) 24 static char rcsid[] = "Id"; 25 #endif /* LIBC_SCCS and not lint */ 26 27 #include <config.h> 28 29 #include <errno.h> 30 #include <string.h> 31 32 #include <lwres/net.h> 33 34 #define NS_INT16SZ 2 35 #define NS_INADDRSZ 4 36 #define NS_IN6ADDRSZ 16 37 38 /* 39 * WARNING: Don't even consider trying to compile this on a system where 40 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 41 */ 42 43 static int inet_pton4(const char *src, unsigned char *dst); 44 static int inet_pton6(const char *src, unsigned char *dst); 45 46 /*! 47 * int 48 * lwres_net_pton(af, src, dst) 49 * convert from presentation format (which usually means ASCII printable) 50 * to network format (which is usually some kind of binary format). 51 * return: 52 * 1 if the address was valid for the specified address family 53 * 0 if the address wasn't valid (`dst' is untouched in this case) 54 * -1 if some other error occurred (`dst' is untouched in this case, too) 55 * author: 56 * Paul Vixie, 1996. 57 */ 58 int 59 lwres_net_pton(int af, const char *src, void *dst) { 60 switch (af) { 61 case AF_INET: 62 return (inet_pton4(src, dst)); 63 case AF_INET6: 64 return (inet_pton6(src, dst)); 65 default: 66 errno = EAFNOSUPPORT; 67 return (-1); 68 } 69 /* NOTREACHED */ 70 } 71 72 /*! int 73 * inet_pton4(src, dst) 74 * like inet_aton() but without all the hexadecimal and shorthand. 75 * return: 76 * 1 if `src' is a valid dotted quad, else 0. 77 * notice: 78 * does not touch `dst' unless it's returning 1. 79 * author: 80 * Paul Vixie, 1996. 81 */ 82 static int 83 inet_pton4(const char *src, unsigned char *dst) { 84 static const char digits[] = "0123456789"; 85 int saw_digit, octets, ch; 86 unsigned char tmp[NS_INADDRSZ], *tp; 87 88 saw_digit = 0; 89 octets = 0; 90 *(tp = tmp) = 0; 91 while ((ch = *src++) != '\0') { 92 const char *pch; 93 94 if ((pch = strchr(digits, ch)) != NULL) { 95 unsigned int new = *tp * 10; 96 97 new += (unsigned int)(pch - digits); 98 if (new > 255) 99 return (0); 100 *tp = new; 101 if (! saw_digit) { 102 if (++octets > 4) 103 return (0); 104 saw_digit = 1; 105 } 106 } else if (ch == '.' && saw_digit) { 107 if (octets == 4) 108 return (0); 109 /* 110 * "clang --analyse" generates warnings using: 111 * *++tp = 0; 112 */ 113 tp++; 114 *tp = 0; 115 saw_digit = 0; 116 } else 117 return (0); 118 } 119 if (octets < 4) 120 return (0); 121 memmove(dst, tmp, NS_INADDRSZ); 122 return (1); 123 } 124 125 /*! int 126 * inet_pton6(src, dst) 127 * convert presentation level address to network order binary form. 128 * return: 129 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 130 * notice: 131 * (1) does not touch `dst' unless it's returning 1. 132 * (2) :: in a full address is silently ignored. 133 * credit: 134 * inspired by Mark Andrews. 135 * author: 136 * Paul Vixie, 1996. 137 */ 138 static int 139 inet_pton6(const char *src, unsigned char *dst) { 140 static const char xdigits_l[] = "0123456789abcdef", 141 xdigits_u[] = "0123456789ABCDEF"; 142 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 143 const char *xdigits, *curtok; 144 int ch, seen_xdigits; 145 unsigned int val; 146 147 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 148 endp = tp + NS_IN6ADDRSZ; 149 colonp = NULL; 150 /* Leading :: requires some special handling. */ 151 if (*src == ':') 152 if (*++src != ':') 153 return (0); 154 curtok = src; 155 seen_xdigits = 0; 156 val = 0; 157 while ((ch = *src++) != '\0') { 158 const char *pch; 159 160 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 161 pch = strchr((xdigits = xdigits_u), ch); 162 if (pch != NULL) { 163 val <<= 4; 164 val |= (pch - xdigits); 165 if (++seen_xdigits > 4) 166 return (0); 167 continue; 168 } 169 if (ch == ':') { 170 curtok = src; 171 if (!seen_xdigits) { 172 if (colonp) 173 return (0); 174 colonp = tp; 175 continue; 176 } 177 if (tp + NS_INT16SZ > endp) 178 return (0); 179 *tp++ = (unsigned char) (val >> 8) & 0xff; 180 *tp++ = (unsigned char) val & 0xff; 181 seen_xdigits = 0; 182 val = 0; 183 continue; 184 } 185 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 186 inet_pton4(curtok, tp) > 0) { 187 tp += NS_INADDRSZ; 188 seen_xdigits = 0; 189 break; /* '\0' was seen by inet_pton4(). */ 190 } 191 return (0); 192 } 193 if (seen_xdigits) { 194 if (tp + NS_INT16SZ > endp) 195 return (0); 196 *tp++ = (unsigned char) (val >> 8) & 0xff; 197 *tp++ = (unsigned char) val & 0xff; 198 } 199 if (colonp != NULL) { 200 /* 201 * Since some memmove()'s erroneously fail to handle 202 * overlapping regions, we'll do the shift by hand. 203 */ 204 const int n = (int)(tp - colonp); 205 int i; 206 207 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 memmove(dst, tmp, NS_IN6ADDRSZ); 216 return (1); 217 } 218