1 /* 2 * Copyright 2001-2002 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 /* 7 * Copyright (c) 1998,1999 by Internet Software Consortium. 8 * 9 * Permission to use, copy, modify, and distribute this software for any 10 * purpose with or without fee is hereby granted, provided that the above 11 * copyright notice and this permission notice appear in all copies. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 14 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 16 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 17 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 18 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 19 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 20 * SOFTWARE. 21 */ 22 23 #pragma ident "%Z%%M% %I% %E% SMI" 24 25 #if defined(LIBC_SCCS) && !defined(lint) 26 static const char rcsid[] = "$Id: inet_cidr_pton.c,v 8.7 2001/09/28 04:21:28 marka Exp $"; 27 #endif 28 29 #include "port_before.h" 30 31 #include <sys/types.h> 32 #include <sys/socket.h> 33 #include <netinet/in.h> 34 #include <arpa/nameser.h> 35 #include <arpa/inet.h> 36 37 #include <isc/assertions.h> 38 #include <ctype.h> 39 #include <errno.h> 40 #include <stdio.h> 41 #include <string.h> 42 #include <stdlib.h> 43 44 #include "port_after.h" 45 46 #ifdef SPRINTF_CHAR 47 # define SPRINTF(x) strlen(sprintf/**/x) 48 #else 49 # define SPRINTF(x) ((size_t)sprintf x) 50 #endif 51 52 static int inet_cidr_pton_ipv4 __P((const char *src, u_char *dst, 53 int *bits, int ipv6)); 54 static int inet_cidr_pton_ipv6 __P((const char *src, u_char *dst, 55 int *bits)); 56 57 static int getbits(const char *, int ipv6); 58 59 /* 60 * int 61 * inet_cidr_pton(af, src, dst, *bits) 62 * convert network address from presentation to network format. 63 * accepts inet_pton()'s input for this "af" plus trailing "/CIDR". 64 * "dst" is assumed large enough for its "af". "bits" is set to the 65 * /CIDR prefix length, which can have defaults (like /32 for IPv4). 66 * return: 67 * -1 if an error occurred (inspect errno; ENOENT means bad format). 68 * 0 if successful conversion occurred. 69 * note: 70 * 192.5.5.1/28 has a nonzero host part, which means it isn't a network 71 * as called for by inet_net_pton() but it can be a host address with 72 * an included netmask. 73 * author: 74 * Paul Vixie (ISC), October 1998 75 */ 76 int 77 inet_cidr_pton(int af, const char *src, void *dst, int *bits) { 78 switch (af) { 79 case AF_INET: 80 return (inet_cidr_pton_ipv4(src, dst, bits, 0)); 81 case AF_INET6: 82 return (inet_cidr_pton_ipv6(src, dst, bits)); 83 default: 84 errno = EAFNOSUPPORT; 85 return (-1); 86 } 87 } 88 89 static const char digits[] = "0123456789"; 90 91 static int 92 inet_cidr_pton_ipv4(const char *src, u_char *dst, int *pbits, int ipv6) { 93 const u_char *odst = dst; 94 int n, ch, tmp, bits; 95 size_t size = 4; 96 97 /* Get the mantissa. */ 98 while (ch = *src++, (isascii(ch) && isdigit(ch))) { 99 tmp = 0; 100 do { 101 n = strchr(digits, ch) - digits; 102 INSIST(n >= 0 && n <= 9); 103 tmp *= 10; 104 tmp += n; 105 if (tmp > 255) 106 goto enoent; 107 } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch)); 108 if (size-- == 0) 109 goto emsgsize; 110 *dst++ = (u_char) tmp; 111 if (ch == '\0' || ch == '/') 112 break; 113 if (ch != '.') 114 goto enoent; 115 } 116 117 /* Get the prefix length if any. */ 118 bits = -1; 119 if (ch == '/' && dst > odst) { 120 bits = getbits(src, ipv6); 121 if (bits == -2) 122 goto enoent; 123 } else if (ch != '\0') 124 goto enoent; 125 126 /* Prefix length can default to /32 only if all four octets spec'd. */ 127 if (bits == -1) { 128 if (dst - odst == 4) 129 bits = ipv6 ? 128 : 32; 130 else 131 goto enoent; 132 } 133 134 /* If nothing was written to the destination, we found no address. */ 135 if (dst == odst) 136 goto enoent; 137 138 /* If prefix length overspecifies mantissa, life is bad. */ 139 if (((bits - (ipv6 ? 96 : 0)) / 8) > (dst - odst)) 140 goto enoent; 141 142 /* Extend address to four octets. */ 143 while (size-- > 0) 144 *dst++ = 0; 145 146 *pbits = bits; 147 return (0); 148 149 enoent: 150 errno = ENOENT; 151 return (-1); 152 153 emsgsize: 154 errno = EMSGSIZE; 155 return (-1); 156 } 157 158 static int 159 inet_cidr_pton_ipv6(const char *src, u_char *dst, int *pbits) { 160 static const char xdigits_l[] = "0123456789abcdef", 161 xdigits_u[] = "0123456789ABCDEF"; 162 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 163 const char *xdigits, *curtok; 164 int ch, saw_xdigit; 165 u_int val; 166 int bits; 167 168 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 169 endp = tp + NS_IN6ADDRSZ; 170 colonp = NULL; 171 /* Leading :: requires some special handling. */ 172 if (*src == ':') 173 if (*++src != ':') 174 return (0); 175 curtok = src; 176 saw_xdigit = 0; 177 val = 0; 178 bits = -1; 179 while ((ch = *src++) != '\0') { 180 const char *pch; 181 182 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 183 pch = strchr((xdigits = xdigits_u), ch); 184 if (pch != NULL) { 185 val <<= 4; 186 val |= (pch - xdigits); 187 if (val > 0xffff) 188 return (0); 189 saw_xdigit = 1; 190 continue; 191 } 192 if (ch == ':') { 193 curtok = src; 194 if (!saw_xdigit) { 195 if (colonp) 196 return (0); 197 colonp = tp; 198 continue; 199 } else if (*src == '\0') { 200 return (0); 201 } 202 if (tp + NS_INT16SZ > endp) 203 return (0); 204 *tp++ = (u_char) (val >> 8) & 0xff; 205 *tp++ = (u_char) val & 0xff; 206 saw_xdigit = 0; 207 val = 0; 208 continue; 209 } 210 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 211 inet_cidr_pton_ipv4(curtok, tp, &bits, 1) == 0) { 212 tp += NS_INADDRSZ; 213 saw_xdigit = 0; 214 break; /* '\0' was seen by inet_pton4(). */ 215 } 216 if (ch == '/') { 217 bits = getbits(src, 1); 218 if (bits == -2) 219 goto enoent; 220 break; 221 } 222 goto enoent; 223 } 224 if (saw_xdigit) { 225 if (tp + NS_INT16SZ > endp) 226 goto emsgsize; 227 *tp++ = (u_char) (val >> 8) & 0xff; 228 *tp++ = (u_char) val & 0xff; 229 } 230 if (colonp != NULL) { 231 /* 232 * Since some memmove()'s erroneously fail to handle 233 * overlapping regions, we'll do the shift by hand. 234 */ 235 const int n = tp - colonp; 236 int i; 237 238 if (tp == endp) 239 goto enoent; 240 for (i = 1; i <= n; i++) { 241 endp[- i] = colonp[n - i]; 242 colonp[n - i] = 0; 243 } 244 tp = endp; 245 } 246 247 memcpy(dst, tmp, NS_IN6ADDRSZ); 248 249 *pbits = bits; 250 return (0); 251 252 enoent: 253 errno = ENOENT; 254 return (-1); 255 256 emsgsize: 257 errno = EMSGSIZE; 258 return (-1); 259 } 260 261 int 262 getbits(const char *src, int ipv6) { 263 int bits = 0; 264 char *cp, ch; 265 266 if (*src == '\0') /* syntax */ 267 return (-2); 268 do { 269 ch = *src++; 270 cp = strchr(digits, ch); 271 if (cp == NULL) /* syntax */ 272 return (-2); 273 bits *= 10; 274 bits += cp - digits; 275 if (bits == 0 && *src != '\0') /* no leading zeros */ 276 return (-2); 277 if (bits > (ipv6 ? 128 : 32)) /* range error */ 278 return (-2); 279 } while (*src != '\0'); 280 281 return (bits); 282 } 283