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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); | |
cc234d94 | 30 | #ifdef INET6 |
8f694072 | 31 | static int inet_pton6(const char *src, unsigned char *dst); |
cc234d94 | 32 | #endif |
8f694072 MP |
33 | |
34 | /* int | |
cc234d94 | 35 | * inet_pton(af, src, dst) |
8f694072 MP |
36 | * convert from presentation format (which usually means ASCII printable) |
37 | * to network format (which is usually some kind of binary format). | |
38 | * return: | |
39 | * 1 if the address was valid for the specified address family | |
40 | * 0 if the address wasn't valid (`dst' is untouched in this case) | |
41 | * -1 if some other error occurred (`dst' is untouched in this case, too) | |
42 | * author: | |
43 | * Paul Vixie, 1996. | |
44 | */ | |
45 | int | |
09b6f4b0 MP |
46 | inet_pton(int af, |
47 | const char *src, | |
48 | void *dst) | |
8f694072 MP |
49 | { |
50 | switch (af) { | |
51 | case AF_INET: | |
52 | return (inet_pton4(src, dst)); | |
7067b0aa | 53 | #ifdef INET6 |
8f694072 MP |
54 | case AF_INET6: |
55 | return (inet_pton6(src, dst)); | |
7067b0aa | 56 | #endif |
8f694072 MP |
57 | default: |
58 | errno = EAFNOSUPPORT; | |
59 | return (-1); | |
60 | } | |
61 | /* NOTREACHED */ | |
62 | } | |
63 | ||
64 | /* int | |
65 | * inet_pton4(src, dst) | |
66 | * like inet_aton() but without all the hexadecimal and shorthand. | |
67 | * return: | |
68 | * 1 if `src' is a valid dotted quad, else 0. | |
69 | * notice: | |
70 | * does not touch `dst' unless it's returning 1. | |
71 | * author: | |
72 | * Paul Vixie, 1996. | |
73 | */ | |
74 | static int | |
75 | inet_pton4(src, dst) | |
76 | const char *src; | |
77 | unsigned char *dst; | |
78 | { | |
79 | static const char digits[] = "0123456789"; | |
80 | int saw_digit, octets, ch; | |
81 | unsigned char tmp[NS_INADDRSZ], *tp; | |
82 | ||
83 | saw_digit = 0; | |
84 | octets = 0; | |
85 | *(tp = tmp) = 0; | |
86 | while ((ch = *src++) != '\0') { | |
87 | const char *pch; | |
88 | ||
89 | if ((pch = strchr(digits, ch)) != NULL) { | |
90 | unsigned int new = *tp * 10 + (pch - digits); | |
91 | ||
92 | if (new > 255) | |
93 | return (0); | |
94 | *tp = new; | |
95 | if (! saw_digit) { | |
96 | if (++octets > 4) | |
97 | return (0); | |
98 | saw_digit = 1; | |
99 | } | |
100 | } else if (ch == '.' && saw_digit) { | |
101 | if (octets == 4) | |
102 | return (0); | |
103 | *++tp = 0; | |
104 | saw_digit = 0; | |
105 | } else | |
106 | return (0); | |
107 | } | |
108 | if (octets < 4) | |
109 | return (0); | |
110 | memcpy(dst, tmp, NS_INADDRSZ); | |
111 | return (1); | |
112 | } | |
113 | ||
114 | /* int | |
115 | * inet_pton6(src, dst) | |
116 | * convert presentation level address to network order binary form. | |
117 | * return: | |
118 | * 1 if `src' is a valid [RFC1884 2.2] address, else 0. | |
119 | * notice: | |
120 | * (1) does not touch `dst' unless it's returning 1. | |
121 | * (2) :: in a full address is silently ignored. | |
122 | * credit: | |
123 | * inspired by Mark Andrews. | |
124 | * author: | |
125 | * Paul Vixie, 1996. | |
126 | */ | |
7067b0aa | 127 | #ifdef INET6 |
8f694072 MP |
128 | static int |
129 | inet_pton6(src, dst) | |
130 | const char *src; | |
131 | unsigned char *dst; | |
132 | { | |
133 | static const char xdigits_l[] = "0123456789abcdef", | |
134 | xdigits_u[] = "0123456789ABCDEF"; | |
135 | unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; | |
136 | const char *xdigits, *curtok; | |
137 | int ch, saw_xdigit; | |
138 | unsigned int val; | |
139 | ||
140 | memset((tp = tmp), '\0', NS_IN6ADDRSZ); | |
141 | endp = tp + NS_IN6ADDRSZ; | |
142 | colonp = NULL; | |
143 | /* Leading :: requires some special handling. */ | |
144 | if (*src == ':') | |
145 | if (*++src != ':') | |
146 | return (0); | |
147 | curtok = src; | |
148 | saw_xdigit = 0; | |
149 | val = 0; | |
150 | while ((ch = *src++) != '\0') { | |
151 | const char *pch; | |
152 | ||
153 | if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) | |
154 | pch = strchr((xdigits = xdigits_u), ch); | |
155 | if (pch != NULL) { | |
156 | val <<= 4; | |
157 | val |= (pch - xdigits); | |
158 | if (val > 0xffff) | |
159 | return (0); | |
160 | saw_xdigit = 1; | |
161 | continue; | |
162 | } | |
163 | if (ch == ':') { | |
164 | curtok = src; | |
165 | if (!saw_xdigit) { | |
166 | if (colonp) | |
167 | return (0); | |
168 | colonp = tp; | |
169 | continue; | |
170 | } | |
171 | if (tp + NS_INT16SZ > endp) | |
172 | return (0); | |
173 | *tp++ = (unsigned char) (val >> 8) & 0xff; | |
174 | *tp++ = (unsigned char) val & 0xff; | |
175 | saw_xdigit = 0; | |
176 | val = 0; | |
177 | continue; | |
178 | } | |
179 | if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && | |
180 | inet_pton4(curtok, tp) > 0) { | |
181 | tp += NS_INADDRSZ; | |
182 | saw_xdigit = 0; | |
183 | break; /* '\0' was seen by inet_pton4(). */ | |
184 | } | |
185 | return (0); | |
186 | } | |
187 | if (saw_xdigit) { | |
188 | if (tp + NS_INT16SZ > endp) | |
189 | return (0); | |
190 | *tp++ = (unsigned char) (val >> 8) & 0xff; | |
191 | *tp++ = (unsigned char) val & 0xff; | |
192 | } | |
193 | if (colonp != NULL) { | |
194 | /* | |
195 | * Since some memmove()'s erroneously fail to handle | |
196 | * overlapping regions, we'll do the shift by hand. | |
197 | */ | |
198 | const int n = tp - colonp; | |
199 | int i; | |
200 | ||
201 | for (i = 1; i <= n; i++) { | |
202 | endp[- i] = colonp[n - i]; | |
203 | colonp[n - i] = 0; | |
204 | } | |
205 | tp = endp; | |
206 | } | |
207 | if (tp != endp) | |
208 | return (0); | |
209 | memcpy(dst, tmp, NS_IN6ADDRSZ); | |
210 | return (1); | |
211 | } | |
7067b0aa | 212 | #endif |