inet_pton.c revision 1.3
1 /* $NetBSD: inet_pton.c,v 1.3 2006/09/26 05:59:18 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (c) 1996,1999 by Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and 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 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/cdefs.h> 21 #if defined(LIBC_SCCS) && !defined(lint) 22 #if 0 23 static const char rcsid[] = "Id: inet_pton.c,v 1.2.206.1 2004/03/09 08:33:33 marka Exp"; 24 #else 25 __RCSID("$NetBSD: inet_pton.c,v 1.3 2006/09/26 05:59:18 lukem Exp $"); 26 #endif 27 #endif /* LIBC_SCCS and not lint */ 28 29 #include "port_before.h" 30 31 #include "namespace.h" 32 #include <sys/param.h> 33 #include <sys/types.h> 34 #include <sys/socket.h> 35 #include <netinet/in.h> 36 #include <arpa/inet.h> 37 #include <arpa/nameser.h> 38 #include <string.h> 39 #include <assert.h> 40 #include <ctype.h> 41 #include <errno.h> 42 43 #include "port_after.h" 44 45 #ifdef __weak_alias 46 __weak_alias(inet_pton,_inet_pton) 47 #endif 48 49 /* 50 * WARNING: Don't even consider trying to compile this on a system where 51 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 52 */ 53 54 static int inet_pton4(const char *src, u_char *dst, int pton); 55 static int inet_pton6(const char *src, u_char *dst); 56 57 /* int 58 * inet_pton(af, src, dst) 59 * convert from presentation format (which usually means ASCII printable) 60 * to network format (which is usually some kind of binary format). 61 * return: 62 * 1 if the address was valid for the specified address family 63 * 0 if the address wasn't valid (`dst' is untouched in this case) 64 * -1 if some other error occurred (`dst' is untouched in this case, too) 65 * author: 66 * Paul Vixie, 1996. 67 */ 68 int 69 inet_pton(int af, const char *src, void *dst) 70 { 71 72 _DIAGASSERT(src != NULL); 73 _DIAGASSERT(dst != NULL); 74 75 switch (af) { 76 case AF_INET: 77 return (inet_pton4(src, dst, 1)); 78 case AF_INET6: 79 return (inet_pton6(src, dst)); 80 default: 81 errno = EAFNOSUPPORT; 82 return (-1); 83 } 84 /* NOTREACHED */ 85 } 86 87 /* int 88 * inet_pton4(src, dst, pton) 89 * when last arg is 0: inet_aton(). with hexadecimal, octal and shorthand. 90 * when last arg is 1: inet_pton(). decimal dotted-quad only. 91 * return: 92 * 1 if `src' is a valid input, else 0. 93 * notice: 94 * does not touch `dst' unless it's returning 1. 95 * author: 96 * Paul Vixie, 1996. 97 */ 98 static int 99 inet_pton4(const char *src, u_char *dst, int pton) 100 { 101 u_int32_t val; 102 u_int digit, base; 103 int n; 104 unsigned char c; 105 u_int parts[4]; 106 register u_int *pp = parts; 107 108 _DIAGASSERT(src != NULL); 109 _DIAGASSERT(dst != NULL); 110 111 c = *src; 112 for (;;) { 113 /* 114 * Collect number up to ``.''. 115 * Values are specified as for C: 116 * 0x=hex, 0=octal, isdigit=decimal. 117 */ 118 if (!isdigit(c)) 119 return (0); 120 val = 0; base = 10; 121 if (c == '0') { 122 c = *++src; 123 if (c == 'x' || c == 'X') 124 base = 16, c = *++src; 125 else if (isdigit(c) && c != '9') 126 base = 8; 127 } 128 /* inet_pton() takes decimal only */ 129 if (pton && base != 10) 130 return (0); 131 for (;;) { 132 if (isdigit(c)) { 133 digit = c - '0'; 134 if (digit >= base) 135 break; 136 val = (val * base) + digit; 137 c = *++src; 138 } else if (base == 16 && isxdigit(c)) { 139 digit = c + 10 - (islower(c) ? 'a' : 'A'); 140 if (digit >= 16) 141 break; 142 val = (val << 4) | digit; 143 c = *++src; 144 } else 145 break; 146 } 147 if (c == '.') { 148 /* 149 * Internet format: 150 * a.b.c.d 151 * a.b.c (with c treated as 16 bits) 152 * a.b (with b treated as 24 bits) 153 * a (with a treated as 32 bits) 154 */ 155 if (pp >= parts + 3) 156 return (0); 157 *pp++ = val; 158 c = *++src; 159 } else 160 break; 161 } 162 /* 163 * Check for trailing characters. 164 */ 165 if (c != '\0' && !isspace(c)) 166 return (0); 167 /* 168 * Concoct the address according to 169 * the number of parts specified. 170 */ 171 n = pp - parts + 1; 172 /* inet_pton() takes dotted-quad only. it does not take shorthand. */ 173 if (pton && n != 4) 174 return (0); 175 switch (n) { 176 177 case 0: 178 return (0); /* initial nondigit */ 179 180 case 1: /* a -- 32 bits */ 181 break; 182 183 case 2: /* a.b -- 8.24 bits */ 184 if (parts[0] > 0xff || val > 0xffffff) 185 return (0); 186 val |= parts[0] << 24; 187 break; 188 189 case 3: /* a.b.c -- 8.8.16 bits */ 190 if ((parts[0] | parts[1]) > 0xff || val > 0xffff) 191 return (0); 192 val |= (parts[0] << 24) | (parts[1] << 16); 193 break; 194 195 case 4: /* a.b.c.d -- 8.8.8.8 bits */ 196 if ((parts[0] | parts[1] | parts[2] | val) > 0xff) 197 return (0); 198 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); 199 break; 200 } 201 if (dst) { 202 val = htonl(val); 203 memcpy(dst, &val, NS_INADDRSZ); 204 } 205 return (1); 206 } 207 208 /* int 209 * inet_pton6(src, dst) 210 * convert presentation level address to network order binary form. 211 * return: 212 * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 213 * notice: 214 * (1) does not touch `dst' unless it's returning 1. 215 * (2) :: in a full address is silently ignored. 216 * credit: 217 * inspired by Mark Andrews. 218 * author: 219 * Paul Vixie, 1996. 220 */ 221 static int 222 inet_pton6(const char *src, u_char *dst) 223 { 224 static const char xdigits_l[] = "0123456789abcdef", 225 xdigits_u[] = "0123456789ABCDEF"; 226 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 227 const char *xdigits, *curtok; 228 int ch, saw_xdigit; 229 u_int val; 230 231 _DIAGASSERT(src != NULL); 232 _DIAGASSERT(dst != NULL); 233 234 memset((tp = tmp), '\0', NS_IN6ADDRSZ); 235 endp = tp + NS_IN6ADDRSZ; 236 colonp = NULL; 237 /* Leading :: requires some special handling. */ 238 if (*src == ':') 239 if (*++src != ':') 240 return (0); 241 curtok = src; 242 saw_xdigit = 0; 243 val = 0; 244 while ((ch = *src++) != '\0') { 245 const char *pch; 246 247 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 248 pch = strchr((xdigits = xdigits_u), ch); 249 if (pch != NULL) { 250 val <<= 4; 251 val |= (pch - xdigits); 252 if (val > 0xffff) 253 return (0); 254 saw_xdigit = 1; 255 continue; 256 } 257 if (ch == ':') { 258 curtok = src; 259 if (!saw_xdigit) { 260 if (colonp) 261 return (0); 262 colonp = tp; 263 continue; 264 } else if (*src == '\0') 265 return (0); 266 if (tp + NS_INT16SZ > endp) 267 return (0); 268 *tp++ = (u_char) (val >> 8) & 0xff; 269 *tp++ = (u_char) val & 0xff; 270 saw_xdigit = 0; 271 val = 0; 272 continue; 273 } 274 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 275 inet_pton4(curtok, tp, 1) > 0) { 276 tp += NS_INADDRSZ; 277 saw_xdigit = 0; 278 break; /* '\0' was seen by inet_pton4(). */ 279 } 280 return (0); 281 } 282 if (saw_xdigit) { 283 if (tp + NS_INT16SZ > endp) 284 return (0); 285 *tp++ = (u_char) (val >> 8) & 0xff; 286 *tp++ = (u_char) val & 0xff; 287 } 288 if (colonp != NULL) { 289 /* 290 * Since some memmove()'s erroneously fail to handle 291 * overlapping regions, we'll do the shift by hand. 292 */ 293 const int n = tp - colonp; 294 int i; 295 296 if (tp == endp) 297 return (0); 298 for (i = 1; i <= n; i++) { 299 endp[- i] = colonp[n - i]; 300 colonp[n - i] = 0; 301 } 302 tp = endp; 303 } 304 if (tp != endp) 305 return (0); 306 memcpy(dst, tmp, NS_IN6ADDRSZ); 307 return (1); 308 } 309
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