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8f694072 MP |
1 | /* |
2 | * Copyright (C) 1996-2001 Internet Software Consortium. | |
3 | * | |
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. | |
7 | * | |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM | |
9 | * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL | |
10 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL | |
11 | * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, | |
12 | * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING | |
13 | * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, | |
14 | * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION | |
15 | * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
16 | */ | |
17 | ||
3723efcb | 18 | #include "rsync.h" |
8f694072 MP |
19 | |
20 | #define NS_INT16SZ 2 | |
21 | #define NS_INADDRSZ 4 | |
22 | #define NS_IN6ADDRSZ 16 | |
23 | ||
24 | /* | |
25 | * WARNING: Don't even consider trying to compile this on a system where | |
26 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. | |
27 | */ | |
28 | ||
29 | static int inet_pton4(const char *src, unsigned char *dst); | |
30 | static int inet_pton6(const char *src, unsigned char *dst); | |
31 | ||
32 | /* int | |
33 | * isc_net_pton(af, src, dst) | |
34 | * convert from presentation format (which usually means ASCII printable) | |
35 | * to network format (which is usually some kind of binary format). | |
36 | * return: | |
37 | * 1 if the address was valid for the specified address family | |
38 | * 0 if the address wasn't valid (`dst' is untouched in this case) | |
39 | * -1 if some other error occurred (`dst' is untouched in this case, too) | |
40 | * author: | |
41 | * Paul Vixie, 1996. | |
42 | */ | |
43 | int | |
09b6f4b0 MP |
44 | inet_pton(int af, |
45 | const char *src, | |
46 | void *dst) | |
8f694072 MP |
47 | { |
48 | switch (af) { | |
49 | case AF_INET: | |
50 | return (inet_pton4(src, dst)); | |
7067b0aa | 51 | #ifdef INET6 |
8f694072 MP |
52 | case AF_INET6: |
53 | return (inet_pton6(src, dst)); | |
7067b0aa | 54 | #endif |
8f694072 MP |
55 | default: |
56 | errno = EAFNOSUPPORT; | |
57 | return (-1); | |
58 | } | |
59 | /* NOTREACHED */ | |
60 | } | |
61 | ||
62 | /* int | |
63 | * inet_pton4(src, dst) | |
64 | * like inet_aton() but without all the hexadecimal and shorthand. | |
65 | * return: | |
66 | * 1 if `src' is a valid dotted quad, else 0. | |
67 | * notice: | |
68 | * does not touch `dst' unless it's returning 1. | |
69 | * author: | |
70 | * Paul Vixie, 1996. | |
71 | */ | |
72 | static int | |
73 | inet_pton4(src, dst) | |
74 | const char *src; | |
75 | unsigned char *dst; | |
76 | { | |
77 | static const char digits[] = "0123456789"; | |
78 | int saw_digit, octets, ch; | |
79 | unsigned char tmp[NS_INADDRSZ], *tp; | |
80 | ||
81 | saw_digit = 0; | |
82 | octets = 0; | |
83 | *(tp = tmp) = 0; | |
84 | while ((ch = *src++) != '\0') { | |
85 | const char *pch; | |
86 | ||
87 | if ((pch = strchr(digits, ch)) != NULL) { | |
88 | unsigned int new = *tp * 10 + (pch - digits); | |
89 | ||
90 | if (new > 255) | |
91 | return (0); | |
92 | *tp = new; | |
93 | if (! saw_digit) { | |
94 | if (++octets > 4) | |
95 | return (0); | |
96 | saw_digit = 1; | |
97 | } | |
98 | } else if (ch == '.' && saw_digit) { | |
99 | if (octets == 4) | |
100 | return (0); | |
101 | *++tp = 0; | |
102 | saw_digit = 0; | |
103 | } else | |
104 | return (0); | |
105 | } | |
106 | if (octets < 4) | |
107 | return (0); | |
108 | memcpy(dst, tmp, NS_INADDRSZ); | |
109 | return (1); | |
110 | } | |
111 | ||
112 | /* int | |
113 | * inet_pton6(src, dst) | |
114 | * convert presentation level address to network order binary form. | |
115 | * return: | |
116 | * 1 if `src' is a valid [RFC1884 2.2] address, else 0. | |
117 | * notice: | |
118 | * (1) does not touch `dst' unless it's returning 1. | |
119 | * (2) :: in a full address is silently ignored. | |
120 | * credit: | |
121 | * inspired by Mark Andrews. | |
122 | * author: | |
123 | * Paul Vixie, 1996. | |
124 | */ | |
7067b0aa | 125 | #ifdef INET6 |
8f694072 MP |
126 | static int |
127 | inet_pton6(src, dst) | |
128 | const char *src; | |
129 | unsigned char *dst; | |
130 | { | |
131 | static const char xdigits_l[] = "0123456789abcdef", | |
132 | xdigits_u[] = "0123456789ABCDEF"; | |
133 | unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; | |
134 | const char *xdigits, *curtok; | |
135 | int ch, saw_xdigit; | |
136 | unsigned int val; | |
137 | ||
138 | memset((tp = tmp), '\0', NS_IN6ADDRSZ); | |
139 | endp = tp + NS_IN6ADDRSZ; | |
140 | colonp = NULL; | |
141 | /* Leading :: requires some special handling. */ | |
142 | if (*src == ':') | |
143 | if (*++src != ':') | |
144 | return (0); | |
145 | curtok = src; | |
146 | saw_xdigit = 0; | |
147 | val = 0; | |
148 | while ((ch = *src++) != '\0') { | |
149 | const char *pch; | |
150 | ||
151 | if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) | |
152 | pch = strchr((xdigits = xdigits_u), ch); | |
153 | if (pch != NULL) { | |
154 | val <<= 4; | |
155 | val |= (pch - xdigits); | |
156 | if (val > 0xffff) | |
157 | return (0); | |
158 | saw_xdigit = 1; | |
159 | continue; | |
160 | } | |
161 | if (ch == ':') { | |
162 | curtok = src; | |
163 | if (!saw_xdigit) { | |
164 | if (colonp) | |
165 | return (0); | |
166 | colonp = tp; | |
167 | continue; | |
168 | } | |
169 | if (tp + NS_INT16SZ > endp) | |
170 | return (0); | |
171 | *tp++ = (unsigned char) (val >> 8) & 0xff; | |
172 | *tp++ = (unsigned char) val & 0xff; | |
173 | saw_xdigit = 0; | |
174 | val = 0; | |
175 | continue; | |
176 | } | |
177 | if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && | |
178 | inet_pton4(curtok, tp) > 0) { | |
179 | tp += NS_INADDRSZ; | |
180 | saw_xdigit = 0; | |
181 | break; /* '\0' was seen by inet_pton4(). */ | |
182 | } | |
183 | return (0); | |
184 | } | |
185 | if (saw_xdigit) { | |
186 | if (tp + NS_INT16SZ > endp) | |
187 | return (0); | |
188 | *tp++ = (unsigned char) (val >> 8) & 0xff; | |
189 | *tp++ = (unsigned char) val & 0xff; | |
190 | } | |
191 | if (colonp != NULL) { | |
192 | /* | |
193 | * Since some memmove()'s erroneously fail to handle | |
194 | * overlapping regions, we'll do the shift by hand. | |
195 | */ | |
196 | const int n = tp - colonp; | |
197 | int i; | |
198 | ||
199 | for (i = 1; i <= n; i++) { | |
200 | endp[- i] = colonp[n - i]; | |
201 | colonp[n - i] = 0; | |
202 | } | |
203 | tp = endp; | |
204 | } | |
205 | if (tp != endp) | |
206 | return (0); | |
207 | memcpy(dst, tmp, NS_IN6ADDRSZ); | |
208 | return (1); | |
209 | } | |
7067b0aa | 210 | #endif |