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path: root/src/lib/libc/net/inet_net_pton.c
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Diffstat (limited to 'src/lib/libc/net/inet_net_pton.c')
-rw-r--r--src/lib/libc/net/inet_net_pton.c199
1 files changed, 199 insertions, 0 deletions
diff --git a/src/lib/libc/net/inet_net_pton.c b/src/lib/libc/net/inet_net_pton.c
new file mode 100644
index 0000000000..e544ca7e28
--- /dev/null
+++ b/src/lib/libc/net/inet_net_pton.c
@@ -0,0 +1,199 @@
1/* $OpenBSD: inet_net_pton.c,v 1.4 2005/03/25 13:24:12 otto Exp $ */
2
3/*
4 * Copyright (c) 1996 by Internet Software Consortium.
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
11 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
12 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
13 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
14 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
15 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
16 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
17 * SOFTWARE.
18 */
19
20#if defined(LIBC_SCCS) && !defined(lint)
21#if 0
22static const char rcsid[] = "$From: inet_net_pton.c,v 8.3 1996/11/11 06:36:52 vixie Exp $";
23#else
24static const char rcsid[] = "$OpenBSD: inet_net_pton.c,v 1.4 2005/03/25 13:24:12 otto Exp $";
25#endif
26#endif
27
28#include <sys/types.h>
29#include <sys/socket.h>
30#include <netinet/in.h>
31#include <arpa/inet.h>
32
33#include <assert.h>
34#include <ctype.h>
35#include <errno.h>
36#include <stdio.h>
37#include <string.h>
38#include <stdlib.h>
39
40static int inet_net_pton_ipv4(const char *, u_char *, size_t);
41
42/*
43 * static int
44 * inet_net_pton(af, src, dst, size)
45 * convert network number from presentation to network format.
46 * accepts hex octets, hex strings, decimal octets, and /CIDR.
47 * "size" is in bytes and describes "dst".
48 * return:
49 * number of bits, either imputed classfully or specified with /CIDR,
50 * or -1 if some failure occurred (check errno). ENOENT means it was
51 * not a valid network specification.
52 * author:
53 * Paul Vixie (ISC), June 1996
54 */
55int
56inet_net_pton(int af, const char *src, void *dst, size_t size)
57{
58 switch (af) {
59 case AF_INET:
60 return (inet_net_pton_ipv4(src, dst, size));
61 default:
62 errno = EAFNOSUPPORT;
63 return (-1);
64 }
65}
66
67/*
68 * static int
69 * inet_net_pton_ipv4(src, dst, size)
70 * convert IPv4 network number from presentation to network format.
71 * accepts hex octets, hex strings, decimal octets, and /CIDR.
72 * "size" is in bytes and describes "dst".
73 * return:
74 * number of bits, either imputed classfully or specified with /CIDR,
75 * or -1 if some failure occurred (check errno). ENOENT means it was
76 * not an IPv4 network specification.
77 * note:
78 * network byte order assumed. this means 192.5.5.240/28 has
79 * 0x11110000 in its fourth octet.
80 * author:
81 * Paul Vixie (ISC), June 1996
82 */
83static int
84inet_net_pton_ipv4(const char *src, u_char *dst, size_t size)
85{
86 static const char
87 xdigits[] = "0123456789abcdef",
88 digits[] = "0123456789";
89 int n, ch, tmp, dirty, bits;
90 const u_char *odst = dst;
91
92 ch = *src++;
93 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
94 && isascii(src[1]) && isxdigit(src[1])) {
95 /* Hexadecimal: Eat nybble string. */
96 if (size <= 0)
97 goto emsgsize;
98 *dst = 0, dirty = 0;
99 src++; /* skip x or X. */
100 while ((ch = *src++) != '\0' &&
101 isascii(ch) && isxdigit(ch)) {
102 if (isupper(ch))
103 ch = tolower(ch);
104 n = strchr(xdigits, ch) - xdigits;
105 assert(n >= 0 && n <= 15);
106 *dst |= n;
107 if (!dirty++)
108 *dst <<= 4;
109 else if (size-- > 0)
110 *++dst = 0, dirty = 0;
111 else
112 goto emsgsize;
113 }
114 if (dirty)
115 size--;
116 } else if (isascii(ch) && isdigit(ch)) {
117 /* Decimal: eat dotted digit string. */
118 for (;;) {
119 tmp = 0;
120 do {
121 n = strchr(digits, ch) - digits;
122 assert(n >= 0 && n <= 9);
123 tmp *= 10;
124 tmp += n;
125 if (tmp > 255)
126 goto enoent;
127 } while ((ch = *src++) != '\0' &&
128 isascii(ch) && isdigit(ch));
129 if (size-- <= 0)
130 goto emsgsize;
131 *dst++ = (u_char) tmp;
132 if (ch == '\0' || ch == '/')
133 break;
134 if (ch != '.')
135 goto enoent;
136 ch = *src++;
137 if (!isascii(ch) || !isdigit(ch))
138 goto enoent;
139 }
140 } else
141 goto enoent;
142
143 bits = -1;
144 if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst) {
145 /* CIDR width specifier. Nothing can follow it. */
146 ch = *src++; /* Skip over the /. */
147 bits = 0;
148 do {
149 n = strchr(digits, ch) - digits;
150 assert(n >= 0 && n <= 9);
151 bits *= 10;
152 bits += n;
153 } while ((ch = *src++) != '\0' &&
154 isascii(ch) && isdigit(ch));
155 if (ch != '\0')
156 goto enoent;
157 if (bits > 32)
158 goto emsgsize;
159 }
160
161 /* Firey death and destruction unless we prefetched EOS. */
162 if (ch != '\0')
163 goto enoent;
164
165 /* If nothing was written to the destination, we found no address. */
166 if (dst == odst)
167 goto enoent;
168 /* If no CIDR spec was given, infer width from net class. */
169 if (bits == -1) {
170 if (*odst >= 240) /* Class E */
171 bits = 32;
172 else if (*odst >= 224) /* Class D */
173 bits = 4;
174 else if (*odst >= 192) /* Class C */
175 bits = 24;
176 else if (*odst >= 128) /* Class B */
177 bits = 16;
178 else /* Class A */
179 bits = 8;
180 /* If imputed mask is narrower than specified octets, widen. */
181 if (bits < ((dst - odst) * 8))
182 bits = (dst - odst) * 8;
183 }
184 /* Extend network to cover the actual mask. */
185 while (bits > ((dst - odst) * 8)) {
186 if (size-- <= 0)
187 goto emsgsize;
188 *dst++ = '\0';
189 }
190 return (bits);
191
192 enoent:
193 errno = ENOENT;
194 return (-1);
195
196 emsgsize:
197 errno = EMSGSIZE;
198 return (-1);
199}
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