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Commit | Line | Data |
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df21c858 | 1 | /* |
e685e07d | 2 | * Copyright (c) 1996,1999 by Internet Software Consortium. |
df21c858 UD |
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 DISCLAIMS | |
9 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES | |
10 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE | |
11 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL | |
12 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR | |
13 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
14 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
15 | * SOFTWARE. | |
16 | */ | |
17 | ||
df21c858 UD |
18 | #include <sys/types.h> |
19 | #include <sys/socket.h> | |
20 | #include <netinet/in.h> | |
21 | #include <arpa/inet.h> | |
22 | ||
23 | #include <errno.h> | |
24 | #include <stdio.h> | |
25 | #include <string.h> | |
26 | #include <stdlib.h> | |
27 | ||
28 | #ifdef SPRINTF_CHAR | |
29 | # define SPRINTF(x) strlen(sprintf/**/x) | |
30 | #else | |
31 | # define SPRINTF(x) ((size_t)sprintf x) | |
32 | #endif | |
33 | ||
79937577 UD |
34 | static char * inet_net_ntop_ipv4 (const u_char *src, int bits, |
35 | char *dst, size_t size) __THROW; | |
df21c858 UD |
36 | |
37 | /* | |
38 | * char * | |
39 | * inet_net_ntop(af, src, bits, dst, size) | |
40 | * convert network number from network to presentation format. | |
41 | * generates CIDR style result always. | |
42 | * return: | |
43 | * pointer to dst, or NULL if an error occurred (check errno). | |
44 | * author: | |
45 | * Paul Vixie (ISC), July 1996 | |
46 | */ | |
47 | char * | |
9d46370c | 48 | inet_net_ntop (int af, const void *src, int bits, char *dst, size_t size) |
df21c858 UD |
49 | { |
50 | switch (af) { | |
51 | case AF_INET: | |
52 | return (inet_net_ntop_ipv4(src, bits, dst, size)); | |
53 | default: | |
c4029823 | 54 | __set_errno (EAFNOSUPPORT); |
df21c858 UD |
55 | return (NULL); |
56 | } | |
57 | } | |
58 | ||
59 | /* | |
60 | * static char * | |
61 | * inet_net_ntop_ipv4(src, bits, dst, size) | |
62 | * convert IPv4 network number from network to presentation format. | |
63 | * generates CIDR style result always. | |
64 | * return: | |
65 | * pointer to dst, or NULL if an error occurred (check errno). | |
66 | * note: | |
67 | * network byte order assumed. this means 192.5.5.240/28 has | |
e685e07d | 68 | * 0b11110000 in its fourth octet. |
df21c858 UD |
69 | * author: |
70 | * Paul Vixie (ISC), July 1996 | |
71 | */ | |
72 | static char * | |
9d46370c | 73 | inet_net_ntop_ipv4 (const u_char *src, int bits, char *dst, size_t size) |
df21c858 UD |
74 | { |
75 | char *odst = dst; | |
76 | char *t; | |
77 | u_int m; | |
78 | int b; | |
79 | ||
80 | if (bits < 0 || bits > 32) { | |
c4029823 | 81 | __set_errno (EINVAL); |
df21c858 UD |
82 | return (NULL); |
83 | } | |
84 | if (bits == 0) { | |
85 | if (size < sizeof "0") | |
86 | goto emsgsize; | |
87 | *dst++ = '0'; | |
e685e07d | 88 | size--; |
df21c858 UD |
89 | *dst = '\0'; |
90 | } | |
91 | ||
92 | /* Format whole octets. */ | |
93 | for (b = bits / 8; b > 0; b--) { | |
94 | if (size < sizeof "255.") | |
95 | goto emsgsize; | |
96 | t = dst; | |
97 | dst += SPRINTF((dst, "%u", *src++)); | |
98 | if (b > 1) { | |
99 | *dst++ = '.'; | |
100 | *dst = '\0'; | |
101 | } | |
102 | size -= (size_t)(dst - t); | |
103 | } | |
104 | ||
105 | /* Format partial octet. */ | |
106 | b = bits % 8; | |
107 | if (b > 0) { | |
108 | if (size < sizeof ".255") | |
109 | goto emsgsize; | |
110 | t = dst; | |
111 | if (dst != odst) | |
112 | *dst++ = '.'; | |
113 | m = ((1 << b) - 1) << (8 - b); | |
114 | dst += SPRINTF((dst, "%u", *src & m)); | |
115 | size -= (size_t)(dst - t); | |
116 | } | |
117 | ||
118 | /* Format CIDR /width. */ | |
119 | if (size < sizeof "/32") | |
120 | goto emsgsize; | |
121 | dst += SPRINTF((dst, "/%u", bits)); | |
122 | return (odst); | |
123 | ||
124 | emsgsize: | |
c4029823 | 125 | __set_errno (EMSGSIZE); |
df21c858 UD |
126 | return (NULL); |
127 | } |