Update.
[glibc.git] / resolv / inet_net_pton.c
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1 /*
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
15 * SOFTWARE.
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$Id$";
20 #endif
22 #include <sys/types.h>
23 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
27 #include <assert.h>
28 #include <ctype.h>
29 #include <errno.h>
30 #include <stdio.h>
31 #include <string.h>
32 #include <stdlib.h>
34 #ifdef SPRINTF_CHAR
35 # define SPRINTF(x) strlen(sprintf/**/x)
36 #else
37 # define SPRINTF(x) ((size_t)sprintf x)
38 #endif
40 static int inet_net_pton_ipv4 __P((const char *src, u_char *dst,
41 size_t size));
44 * static int
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".
49 * return:
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.
53 * author:
54 * Paul Vixie (ISC), June 1996
56 int
57 inet_net_pton(af, src, dst, size)
58 int af;
59 const char *src;
60 void *dst;
61 size_t size;
63 switch (af) {
64 case AF_INET:
65 return (inet_net_pton_ipv4(src, dst, size));
66 default:
67 __set_errno (EAFNOSUPPORT);
68 return (-1);
73 * static int
74 * inet_net_pton_ipv4(src, dst, size)
75 * convert IPv4 network number from presentation to network format.
76 * accepts hex octets, hex strings, decimal octets, and /CIDR.
77 * "size" is in bytes and describes "dst".
78 * return:
79 * number of bits, either imputed classfully or specified with /CIDR,
80 * or -1 if some failure occurred (check errno). ENOENT means it was
81 * not an IPv4 network specification.
82 * note:
83 * network byte order assumed. this means 192.5.5.240/28 has
84 * 0x11110000 in its fourth octet.
85 * author:
86 * Paul Vixie (ISC), June 1996
88 static int
89 inet_net_pton_ipv4(src, dst, size)
90 const char *src;
91 u_char *dst;
92 size_t size;
94 static const char
95 xdigits[] = "0123456789abcdef",
96 digits[] = "0123456789";
97 int n, ch, tmp, dirty, bits;
98 const u_char *odst = dst;
100 ch = *src++;
101 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
102 && isascii(src[1]) && isxdigit(src[1])) {
103 /* Hexadecimal: Eat nybble string. */
104 if (size <= 0)
105 goto emsgsize;
106 *dst = 0, dirty = 0;
107 src++; /* skip x or X. */
108 while ((ch = *src++) != '\0' &&
109 isascii(ch) && isxdigit(ch)) {
110 if (isupper(ch))
111 ch = tolower(ch);
112 n = strchr(xdigits, ch) - xdigits;
113 assert(n >= 0 && n <= 15);
114 *dst |= n;
115 if (!dirty++)
116 *dst <<= 4;
117 else if (size-- > 0)
118 *++dst = 0, dirty = 0;
119 else
120 goto emsgsize;
122 if (dirty)
123 size--;
124 } else if (isascii(ch) && isdigit(ch)) {
125 /* Decimal: eat dotted digit string. */
126 for (;;) {
127 tmp = 0;
128 do {
129 n = strchr(digits, ch) - digits;
130 assert(n >= 0 && n <= 9);
131 tmp *= 10;
132 tmp += n;
133 if (tmp > 255)
134 goto enoent;
135 } while ((ch = *src++) != '\0' &&
136 isascii(ch) && isdigit(ch));
137 if (size-- <= 0)
138 goto emsgsize;
139 *dst++ = (u_char) tmp;
140 if (ch == '\0' || ch == '/')
141 break;
142 if (ch != '.')
143 goto enoent;
144 ch = *src++;
145 if (!isascii(ch) || !isdigit(ch))
146 goto enoent;
148 } else
149 goto enoent;
151 bits = -1;
152 if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst) {
153 /* CIDR width specifier. Nothing can follow it. */
154 ch = *src++; /* Skip over the /. */
155 bits = 0;
156 do {
157 n = strchr(digits, ch) - digits;
158 assert(n >= 0 && n <= 9);
159 bits *= 10;
160 bits += n;
161 } while ((ch = *src++) != '\0' &&
162 isascii(ch) && isdigit(ch));
163 if (ch != '\0')
164 goto enoent;
165 if (bits > 32)
166 goto emsgsize;
169 /* Firey death and destruction unless we prefetched EOS. */
170 if (ch != '\0')
171 goto enoent;
173 /* If nothing was written to the destination, we found no address. */
174 if (dst == odst)
175 goto enoent;
176 /* If no CIDR spec was given, infer width from net class. */
177 if (bits == -1) {
178 if (*odst >= 240) /* Class E */
179 bits = 32;
180 else if (*odst >= 224) /* Class D */
181 bits = 4;
182 else if (*odst >= 192) /* Class C */
183 bits = 24;
184 else if (*odst >= 128) /* Class B */
185 bits = 16;
186 else /* Class A */
187 bits = 8;
188 /* If imputed mask is narrower than specified octets, widen. */
189 if (bits >= 8 && bits < ((dst - odst) * 8))
190 bits = (dst - odst) * 8;
192 /* Extend network to cover the actual mask. */
193 while (bits > ((dst - odst) * 8)) {
194 if (size-- <= 0)
195 goto emsgsize;
196 *dst++ = '\0';
198 return (bits);
200 enoent:
201 __set_errno (ENOENT);
202 return (-1);
204 emsgsize:
205 __set_errno (EMSGSIZE);
206 return (-1);