2 * Copyright (c) 1996 by Internet Software Consortium.
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$Id: inet_net_pton.c,v 1.8 1999/05/25 16:12:05 momjian Exp $";
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
36 #include <utils/builtins.h>
39 #define SPRINTF(x) strlen(sprintf/**/x)
41 #define SPRINTF(x) ((size_t)sprintf x)
44 static int inet_net_pton_ipv4(const char *src, u_char *dst);
45 static int inet_cidr_pton_ipv4(const char *src, u_char *dst, size_t size);
49 * inet_net_pton(af, src, dst, size)
50 * convert network number from presentation to network format.
51 * accepts hex octets, hex strings, decimal octets, and /CIDR.
52 * "size" is in bytes and describes "dst".
54 * number of bits, either imputed classfully or specified with /CIDR,
55 * or -1 if some failure occurred (check errno). ENOENT means it was
56 * not a valid network specification.
58 * Paul Vixie (ISC), June 1996
61 * I added the inet_cidr_pton function (also from Paul) and changed
62 * the names to reflect their current use.
66 inet_net_pton(int af, const char *src, void *dst, size_t size)
72 inet_net_pton_ipv4(src, dst) :
73 inet_cidr_pton_ipv4(src, dst, size);
82 * inet_cidr_pton_ipv4(src, dst, size)
83 * convert IPv4 network number from presentation to network format.
84 * accepts hex octets, hex strings, decimal octets, and /CIDR.
85 * "size" is in bytes and describes "dst".
87 * number of bits, either imputed classfully or specified with /CIDR,
88 * or -1 if some failure occurred (check errno). ENOENT means it was
89 * not an IPv4 network specification.
91 * network byte order assumed. this means 192.5.5.240/28 has
92 * 0x11110000 in its fourth octet.
94 * Paul Vixie (ISC), June 1996
97 inet_cidr_pton_ipv4(const char *src, u_char *dst, size_t size)
100 xdigits[] = "0123456789abcdef",
101 digits[] = "0123456789";
107 const u_char *odst = dst;
110 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
111 && isascii(src[1]) && isxdigit(src[1]))
113 /* Hexadecimal: Eat nybble string. */
118 src++; /* skip x or X. */
119 while ((ch = *src++) != '\0' && isascii(ch) && isxdigit(ch))
123 n = strchr(xdigits, ch) - xdigits;
124 assert(n >= 0 && n <= 15);
128 tmp = (tmp << 4) | n;
133 *dst++ = (u_char) tmp;
138 { /* Odd trailing nybble? */
141 *dst++ = (u_char) (tmp << 4);
144 else if (isascii(ch) && isdigit(ch))
146 /* Decimal: eat dotted digit string. */
152 n = strchr(digits, ch) - digits;
153 assert(n >= 0 && n <= 9);
158 } while ((ch = *src++) != '\0' &&
159 isascii(ch) && isdigit(ch));
162 *dst++ = (u_char) tmp;
163 if (ch == '\0' || ch == '/')
168 if (!isascii(ch) || !isdigit(ch))
176 if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst)
178 /* CIDR width specifier. Nothing can follow it. */
179 ch = *src++; /* Skip over the /. */
183 n = strchr(digits, ch) - digits;
184 assert(n >= 0 && n <= 9);
187 } while ((ch = *src++) != '\0' &&
188 isascii(ch) && isdigit(ch));
195 /* Firey death and destruction unless we prefetched EOS. */
199 /* If nothing was written to the destination, we found no address. */
202 /* If no CIDR spec was given, infer width from net class. */
205 if (*odst >= 240) /* Class E */
207 else if (*odst >= 224) /* Class D */
209 else if (*odst >= 192) /* Class C */
211 else if (*odst >= 128) /* Class B */
216 /* If imputed mask is narrower than specified octets, widen. */
217 if (bits >= 8 && bits < ((dst - odst) * 8))
218 bits = (dst - odst) * 8;
220 /* Extend network to cover the actual mask. */
221 while (bits > ((dst - odst) * 8))
240 * inet_net_pton(af, src, dst, *bits)
241 * convert network address from presentation to network format.
242 * accepts inet_pton()'s input for this "af" plus trailing "/CIDR".
243 * "dst" is assumed large enough for its "af". "bits" is set to the
244 * /CIDR prefix length, which can have defaults (like /32 for IPv4).
246 * -1 if an error occurred (inspect errno; ENOENT means bad format).
247 * 0 if successful conversion occurred.
249 * 192.5.5.1/28 has a nonzero host part, which means it isn't a network
250 * as called for by inet_cidr_pton() but it can be a host address with
251 * an included netmask.
253 * Paul Vixie (ISC), October 1998
256 inet_net_pton_ipv4(const char *src, u_char *dst)
258 static const char digits[] = "0123456789";
259 const u_char *odst = dst;
266 /* Get the mantissa. */
267 while (ch = *src++, (isascii(ch) && isdigit(ch)))
272 n = strchr(digits, ch) - digits;
273 assert(n >= 0 && n <= 9);
278 } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
281 *dst++ = (u_char) tmp;
282 if (ch == '\0' || ch == '/')
288 /* Get the prefix length if any. */
290 if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst)
292 /* CIDR width specifier. Nothing can follow it. */
293 ch = *src++; /* Skip over the /. */
297 n = strchr(digits, ch) - digits;
298 assert(n >= 0 && n <= 9);
301 } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
308 /* Firey death and destruction unless we prefetched EOS. */
312 /* Prefix length can default to /32 only if all four octets spec'd. */
321 /* If nothing was written to the destination, we found no address. */
325 /* If prefix length overspecifies mantissa, life is bad. */
326 if ((bits / 8) > (dst - odst))
329 /* Extend address to four octets. */