File: | src/lib/libc/net/inet_pton.c |
Warning: | line 182, column 4 Value stored to 'count_xdigit' is never read |
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1 | /* $OpenBSD: inet_pton.c,v 1.10 2015/09/13 21:36:08 guenther Exp $ */ |
2 | |
3 | /* Copyright (c) 1996 by Internet Software Consortium. |
4 | * |
5 | * Permission to use, copy, modify, and distribute this software for any |
6 | * purpose with or without fee is hereby granted, provided that the above |
7 | * copyright notice and this permission notice appear in all copies. |
8 | * |
9 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
10 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
11 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
12 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
13 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
14 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
15 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
16 | * SOFTWARE. |
17 | */ |
18 | |
19 | #include <sys/types.h> |
20 | #include <sys/socket.h> |
21 | #include <netinet/in.h> |
22 | #include <arpa/inet.h> |
23 | #include <arpa/nameser.h> |
24 | #include <string.h> |
25 | #include <errno(*__errno()).h> |
26 | |
27 | /* |
28 | * WARNING: Don't even consider trying to compile this on a system where |
29 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. |
30 | */ |
31 | |
32 | static int inet_pton4(const char *src, u_char *dst); |
33 | static int inet_pton6(const char *src, u_char *dst); |
34 | |
35 | /* int |
36 | * inet_pton(af, src, dst) |
37 | * convert from presentation format (which usually means ASCII printable) |
38 | * to network format (which is usually some kind of binary format). |
39 | * return: |
40 | * 1 if the address was valid for the specified address family |
41 | * 0 if the address wasn't valid (`dst' is untouched in this case) |
42 | * -1 if some other error occurred (`dst' is untouched in this case, too) |
43 | * author: |
44 | * Paul Vixie, 1996. |
45 | */ |
46 | int |
47 | inet_pton(int af, const char *src, void *dst) |
48 | { |
49 | switch (af) { |
50 | case AF_INET2: |
51 | return (inet_pton4(src, dst)); |
52 | case AF_INET624: |
53 | return (inet_pton6(src, dst)); |
54 | default: |
55 | errno(*__errno()) = EAFNOSUPPORT47; |
56 | return (-1); |
57 | } |
58 | /* NOTREACHED */ |
59 | } |
60 | DEF_WEAK(inet_pton)__asm__(".weak " "inet_pton" " ; " "inet_pton" " = " "_libc_inet_pton" ); |
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(const char *src, u_char *dst) |
74 | { |
75 | static const char digits[] = "0123456789"; |
76 | int saw_digit, octets, ch; |
77 | u_char tmp[INADDRSZ4], *tp; |
78 | |
79 | saw_digit = 0; |
80 | octets = 0; |
81 | *(tp = tmp) = 0; |
82 | while ((ch = *src++) != '\0') { |
83 | const char *pch; |
84 | |
85 | if ((pch = strchr(digits, ch)) != NULL((void *)0)) { |
86 | u_int new = *tp * 10 + (pch - digits); |
87 | |
88 | if (new > 255) |
89 | return (0); |
90 | if (! saw_digit) { |
91 | if (++octets > 4) |
92 | return (0); |
93 | saw_digit = 1; |
94 | } |
95 | *tp = new; |
96 | } else if (ch == '.' && saw_digit) { |
97 | if (octets == 4) |
98 | return (0); |
99 | *++tp = 0; |
100 | saw_digit = 0; |
101 | } else |
102 | return (0); |
103 | } |
104 | if (octets < 4) |
105 | return (0); |
106 | |
107 | memcpy(dst, tmp, INADDRSZ4); |
108 | return (1); |
109 | } |
110 | |
111 | /* int |
112 | * inet_pton6(src, dst) |
113 | * convert presentation level address to network order binary form. |
114 | * return: |
115 | * 1 if `src' is a valid [RFC1884 2.2] address, else 0. |
116 | * notice: |
117 | * does not touch `dst' unless it's returning 1. |
118 | * credit: |
119 | * inspired by Mark Andrews. |
120 | * author: |
121 | * Paul Vixie, 1996. |
122 | */ |
123 | static int |
124 | inet_pton6(const char *src, u_char *dst) |
125 | { |
126 | static const char xdigits_l[] = "0123456789abcdef", |
127 | xdigits_u[] = "0123456789ABCDEF"; |
128 | u_char tmp[IN6ADDRSZ16], *tp, *endp, *colonp; |
129 | const char *xdigits, *curtok; |
130 | int ch, saw_xdigit, count_xdigit; |
131 | u_int val; |
132 | |
133 | memset((tp = tmp), '\0', IN6ADDRSZ16); |
134 | endp = tp + IN6ADDRSZ16; |
135 | colonp = NULL((void *)0); |
136 | /* Leading :: requires some special handling. */ |
137 | if (*src == ':') |
138 | if (*++src != ':') |
139 | return (0); |
140 | curtok = src; |
141 | saw_xdigit = count_xdigit = 0; |
142 | val = 0; |
143 | while ((ch = *src++) != '\0') { |
144 | const char *pch; |
145 | |
146 | if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL((void *)0)) |
147 | pch = strchr((xdigits = xdigits_u), ch); |
148 | if (pch != NULL((void *)0)) { |
149 | if (count_xdigit >= 4) |
150 | return (0); |
151 | val <<= 4; |
152 | val |= (pch - xdigits); |
153 | if (val > 0xffff) |
154 | return (0); |
155 | saw_xdigit = 1; |
156 | count_xdigit++; |
157 | continue; |
158 | } |
159 | if (ch == ':') { |
160 | curtok = src; |
161 | if (!saw_xdigit) { |
162 | if (colonp) |
163 | return (0); |
164 | colonp = tp; |
165 | continue; |
166 | } else if (*src == '\0') { |
167 | return (0); |
168 | } |
169 | if (tp + INT16SZ2 > endp) |
170 | return (0); |
171 | *tp++ = (u_char) (val >> 8) & 0xff; |
172 | *tp++ = (u_char) val & 0xff; |
173 | saw_xdigit = 0; |
174 | count_xdigit = 0; |
175 | val = 0; |
176 | continue; |
177 | } |
178 | if (ch == '.' && ((tp + INADDRSZ4) <= endp) && |
179 | inet_pton4(curtok, tp) > 0) { |
180 | tp += INADDRSZ4; |
181 | saw_xdigit = 0; |
182 | count_xdigit = 0; |
Value stored to 'count_xdigit' is never read | |
183 | break; /* '\0' was seen by inet_pton4(). */ |
184 | } |
185 | return (0); |
186 | } |
187 | if (saw_xdigit) { |
188 | if (tp + INT16SZ2 > endp) |
189 | return (0); |
190 | *tp++ = (u_char) (val >> 8) & 0xff; |
191 | *tp++ = (u_char) val & 0xff; |
192 | } |
193 | if (colonp != NULL((void *)0)) { |
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 | if (tp == endp) |
202 | return (0); |
203 | for (i = 1; i <= n; i++) { |
204 | endp[- i] = colonp[n - i]; |
205 | colonp[n - i] = 0; |
206 | } |
207 | tp = endp; |
208 | } |
209 | if (tp != endp) |
210 | return (0); |
211 | memcpy(dst, tmp, IN6ADDRSZ16); |
212 | return (1); |
213 | } |