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 1.1 1998/10/03 05:40:49 momjian Exp $";
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.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, size_t size);
45 * inet_net_pton(af, src, dst, size)
46 * convert network number from presentation to network format.
47 * accepts hex octets, hex strings, decimal octets, and /CIDR.
48 * "size" is in bytes and describes "dst".
50 * number of bits, either imputed classfully or specified with /CIDR,
51 * or -1 if some failure occurred (check errno). ENOENT means it was
52 * not a valid network specification.
54 * Paul Vixie (ISC), June 1996
57 inet_net_pton(int af, const char *src, void *dst, size_t size)
62 return (inet_net_pton_ipv4(src, dst, size));
71 * inet_net_pton_ipv4(src, dst, size)
72 * convert IPv4 network number from presentation to network format.
73 * accepts hex octets, hex strings, decimal octets, and /CIDR.
74 * "size" is in bytes and describes "dst".
76 * number of bits, either imputed classfully or specified with /CIDR,
77 * or -1 if some failure occurred (check errno). ENOENT means it was
78 * not an IPv4 network specification.
80 * network byte order assumed. this means 192.5.5.240/28 has
81 * 0x11110000 in its fourth octet.
83 * Paul Vixie (ISC), June 1996
86 inet_net_pton_ipv4(const char *src, u_char *dst, size_t size)
89 xdigits[] = "0123456789abcdef",
90 digits[] = "0123456789";
96 const u_char *odst = dst;
99 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
100 && isascii(src[1]) && isxdigit(src[1]))
102 /* Hexadecimal: Eat nybble string. */
106 src++; /* skip x or X. */
107 while ((ch = *src++) != '\0' &&
108 isascii(ch) && isxdigit(ch))
112 n = strchr(xdigits, ch) - xdigits;
113 assert(n >= 0 && n <= 15);
118 *++dst = 0, dirty = 0;
125 else if (isascii(ch) && isdigit(ch))
127 /* Decimal: eat dotted digit string. */
133 n = strchr(digits, ch) - digits;
134 assert(n >= 0 && n <= 9);
139 } while ((ch = *src++) != '\0' &&
140 isascii(ch) && isdigit(ch));
143 *dst++ = (u_char) tmp;
144 if (ch == '\0' || ch == '/')
149 if (!isascii(ch) || !isdigit(ch))
157 if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst)
159 /* CIDR width specifier. Nothing can follow it. */
160 ch = *src++; /* Skip over the /. */
164 n = strchr(digits, ch) - digits;
165 assert(n >= 0 && n <= 9);
168 } while ((ch = *src++) != '\0' &&
169 isascii(ch) && isdigit(ch));
176 /* Firey death and destruction unless we prefetched EOS. */
180 /* If nothing was written to the destination, we found no address. */
183 /* If no CIDR spec was given, infer width from net class. */
186 if (*odst >= 240) /* Class E */
188 else if (*odst >= 224) /* Class D */
190 else if (*odst >= 192) /* Class C */
192 else if (*odst >= 128) /* Class B */
197 /* If imputed mask is narrower than specified octets, widen. */
198 if (bits >= 8 && bits < ((dst - odst) * 8))
199 bits = (dst - odst) * 8;
201 /* Extend network to cover the actual mask. */
202 while (bits > ((dst - odst) * 8))