File: | src/lib/libc/net/inet_net_ntop.c |
Warning: | line 131, column 2 Value stored to 'dst' is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
1 | /* $OpenBSD: inet_net_ntop.c,v 1.9 2019/07/03 03:24:04 deraadt Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 2012 by Gilles Chehade <gilles@openbsd.org> |
5 | * Copyright (c) 1996 by Internet Software Consortium. |
6 | * |
7 | * Permission to use, copy, modify, and distribute this software for any |
8 | * purpose with or without fee is hereby granted, provided that the above |
9 | * copyright notice and this permission notice appear in all copies. |
10 | * |
11 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
12 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
13 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
14 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
15 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
16 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
17 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
18 | * SOFTWARE. |
19 | */ |
20 | |
21 | #include <sys/types.h> |
22 | #include <sys/socket.h> |
23 | #include <netinet/in.h> |
24 | #include <arpa/inet.h> |
25 | |
26 | #include <errno(*__errno()).h> |
27 | #include <stdio.h> |
28 | #include <string.h> |
29 | #include <stdlib.h> |
30 | |
31 | static char *inet_net_ntop_ipv4(const u_char *, int, char *, size_t); |
32 | static char *inet_net_ntop_ipv6(const u_char *, int, char *, size_t); |
33 | |
34 | /* |
35 | * char * |
36 | * inet_net_ntop(af, src, bits, dst, size) |
37 | * convert network number from network to presentation format. |
38 | * generates CIDR style result always. |
39 | * return: |
40 | * pointer to dst, or NULL if an error occurred (check errno). |
41 | * author: |
42 | * Paul Vixie (ISC), July 1996 |
43 | */ |
44 | char * |
45 | inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size) |
46 | { |
47 | switch (af) { |
48 | case AF_INET2: |
49 | return (inet_net_ntop_ipv4(src, bits, dst, size)); |
50 | case AF_INET624: |
51 | return (inet_net_ntop_ipv6(src, bits, dst, size)); |
52 | default: |
53 | errno(*__errno()) = EAFNOSUPPORT47; |
54 | return (NULL((void *)0)); |
55 | } |
56 | } |
57 | |
58 | /* |
59 | * static char * |
60 | * inet_net_ntop_ipv4(src, bits, dst, size) |
61 | * convert IPv4 network number from network to presentation format. |
62 | * generates CIDR style result always. |
63 | * return: |
64 | * pointer to dst, or NULL if an error occurred (check errno). |
65 | * note: |
66 | * network byte order assumed. this means 192.5.5.240/28 has |
67 | * 0x11110000 in its fourth octet. |
68 | * author: |
69 | * Paul Vixie (ISC), July 1996 |
70 | */ |
71 | static char * |
72 | inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size) |
73 | { |
74 | char *odst = dst; |
75 | u_int m; |
76 | int b; |
77 | char *ep; |
78 | int advance; |
79 | |
80 | ep = dst + size; |
81 | if (ep <= dst) |
82 | goto emsgsize; |
83 | |
84 | if (bits < 0 || bits > 32) { |
85 | errno(*__errno()) = EINVAL22; |
86 | return (NULL((void *)0)); |
87 | } |
88 | if (bits == 0) { |
89 | if (ep - dst < sizeof "0") |
90 | goto emsgsize; |
91 | *dst++ = '0'; |
92 | *dst = '\0'; |
93 | } |
94 | |
95 | /* Format whole octets. */ |
96 | for (b = bits / 8; b > 0; b--) { |
97 | if (ep - dst < sizeof "255.") |
98 | goto emsgsize; |
99 | advance = snprintf(dst, ep - dst, "%u", *src++); |
100 | if (advance <= 0 || advance >= ep - dst) |
101 | goto emsgsize; |
102 | dst += advance; |
103 | if (b > 1) { |
104 | if (dst + 1 >= ep) |
105 | goto emsgsize; |
106 | *dst++ = '.'; |
107 | *dst = '\0'; |
108 | } |
109 | } |
110 | |
111 | /* Format partial octet. */ |
112 | b = bits % 8; |
113 | if (b > 0) { |
114 | if (ep - dst < sizeof ".255") |
115 | goto emsgsize; |
116 | if (dst != odst) |
117 | *dst++ = '.'; |
118 | m = ((1 << b) - 1) << (8 - b); |
119 | advance = snprintf(dst, ep - dst, "%u", *src & m); |
120 | if (advance <= 0 || advance >= ep - dst) |
121 | goto emsgsize; |
122 | dst += advance; |
123 | } |
124 | |
125 | /* Format CIDR /width. */ |
126 | if (ep - dst < sizeof "/32") |
127 | goto emsgsize; |
128 | advance = snprintf(dst, ep - dst, "/%u", bits); |
129 | if (advance <= 0 || advance >= ep - dst) |
130 | goto emsgsize; |
131 | dst += advance; |
Value stored to 'dst' is never read | |
132 | return (odst); |
133 | |
134 | emsgsize: |
135 | errno(*__errno()) = EMSGSIZE40; |
136 | return (NULL((void *)0)); |
137 | } |
138 | |
139 | static char * |
140 | inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size) |
141 | { |
142 | int ret; |
143 | char buf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255:255:255:255/128")]; |
144 | |
145 | if (bits < 0 || bits > 128) { |
146 | errno(*__errno()) = EINVAL22; |
147 | return (NULL((void *)0)); |
148 | } |
149 | |
150 | if (inet_ntop(AF_INET624, src, buf, size) == NULL((void *)0)) |
151 | return (NULL((void *)0)); |
152 | |
153 | ret = snprintf(dst, size, "%s/%d", buf, bits); |
154 | if (ret < 0 || ret >= size) { |
155 | errno(*__errno()) = EMSGSIZE40; |
156 | return (NULL((void *)0)); |
157 | } |
158 | |
159 | return (dst); |
160 | } |