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 1.10 1999/07/17 20:17:56 momjian Exp $";
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
33 #include "utils/builtins.h"
36 #define SPRINTF(x) strlen(sprintf/**/x)
38 #define SPRINTF(x) ((size_t)sprintf x)
41 static int inet_net_pton_ipv4(const char *src, u_char *dst);
42 static int inet_cidr_pton_ipv4(const char *src, u_char *dst, size_t size);
46 * inet_net_pton(af, src, dst, size)
47 * convert network number from presentation to network format.
48 * accepts hex octets, hex strings, decimal octets, and /CIDR.
49 * "size" is in bytes and describes "dst".
51 * number of bits, either imputed classfully or specified with /CIDR,
52 * or -1 if some failure occurred (check errno). ENOENT means it was
53 * not a valid network specification.
55 * Paul Vixie (ISC), June 1996
58 * I added the inet_cidr_pton function (also from Paul) and changed
59 * the names to reflect their current use.
63 inet_net_pton(int af, const char *src, void *dst, size_t size)
69 inet_net_pton_ipv4(src, dst) :
70 inet_cidr_pton_ipv4(src, dst, size);
79 * inet_cidr_pton_ipv4(src, dst, size)
80 * convert IPv4 network number from presentation to network format.
81 * accepts hex octets, hex strings, decimal octets, and /CIDR.
82 * "size" is in bytes and describes "dst".
84 * number of bits, either imputed classfully or specified with /CIDR,
85 * or -1 if some failure occurred (check errno). ENOENT means it was
86 * not an IPv4 network specification.
88 * network byte order assumed. this means 192.5.5.240/28 has
89 * 0x11110000 in its fourth octet.
91 * Paul Vixie (ISC), June 1996
94 inet_cidr_pton_ipv4(const char *src, u_char *dst, size_t size)
97 xdigits[] = "0123456789abcdef",
98 digits[] = "0123456789";
104 const u_char *odst = dst;
107 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
108 && isascii(src[1]) && isxdigit(src[1]))
110 /* Hexadecimal: Eat nybble string. */
115 src++; /* skip x or X. */
116 while ((ch = *src++) != '\0' && isascii(ch) && isxdigit(ch))
120 n = strchr(xdigits, ch) - xdigits;
121 assert(n >= 0 && n <= 15);
125 tmp = (tmp << 4) | n;
130 *dst++ = (u_char) tmp;
135 { /* Odd trailing nybble? */
138 *dst++ = (u_char) (tmp << 4);
141 else if (isascii(ch) && isdigit(ch))
143 /* Decimal: eat dotted digit string. */
149 n = strchr(digits, ch) - digits;
150 assert(n >= 0 && n <= 9);
155 } while ((ch = *src++) != '\0' &&
156 isascii(ch) && isdigit(ch));
159 *dst++ = (u_char) tmp;
160 if (ch == '\0' || ch == '/')
165 if (!isascii(ch) || !isdigit(ch))
173 if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst)
175 /* CIDR width specifier. Nothing can follow it. */
176 ch = *src++; /* Skip over the /. */
180 n = strchr(digits, ch) - digits;
181 assert(n >= 0 && n <= 9);
184 } while ((ch = *src++) != '\0' &&
185 isascii(ch) && isdigit(ch));
192 /* Firey death and destruction unless we prefetched EOS. */
196 /* If nothing was written to the destination, we found no address. */
199 /* If no CIDR spec was given, infer width from net class. */
202 if (*odst >= 240) /* Class E */
204 else if (*odst >= 224) /* Class D */
206 else if (*odst >= 192) /* Class C */
208 else if (*odst >= 128) /* Class B */
213 /* If imputed mask is narrower than specified octets, widen. */
214 if (bits >= 8 && bits < ((dst - odst) * 8))
215 bits = (dst - odst) * 8;
217 /* Extend network to cover the actual mask. */
218 while (bits > ((dst - odst) * 8))
237 * inet_net_pton(af, src, dst, *bits)
238 * convert network address from presentation to network format.
239 * accepts inet_pton()'s input for this "af" plus trailing "/CIDR".
240 * "dst" is assumed large enough for its "af". "bits" is set to the
241 * /CIDR prefix length, which can have defaults (like /32 for IPv4).
243 * -1 if an error occurred (inspect errno; ENOENT means bad format).
244 * 0 if successful conversion occurred.
246 * 192.5.5.1/28 has a nonzero host part, which means it isn't a network
247 * as called for by inet_cidr_pton() but it can be a host address with
248 * an included netmask.
250 * Paul Vixie (ISC), October 1998
253 inet_net_pton_ipv4(const char *src, u_char *dst)
255 static const char digits[] = "0123456789";
256 const u_char *odst = dst;
263 /* Get the mantissa. */
264 while (ch = *src++, (isascii(ch) && isdigit(ch)))
269 n = strchr(digits, ch) - digits;
270 assert(n >= 0 && n <= 9);
275 } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
278 *dst++ = (u_char) tmp;
279 if (ch == '\0' || ch == '/')
285 /* Get the prefix length if any. */
287 if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst)
289 /* CIDR width specifier. Nothing can follow it. */
290 ch = *src++; /* Skip over the /. */
294 n = strchr(digits, ch) - digits;
295 assert(n >= 0 && n <= 9);
298 } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
305 /* Firey death and destruction unless we prefetched EOS. */
309 /* Prefix length can default to /32 only if all four octets spec'd. */
318 /* If nothing was written to the destination, we found no address. */
322 /* If prefix length overspecifies mantissa, life is bad. */
323 if ((bits / 8) > (dst - odst))
326 /* Extend address to four octets. */