1 | /* |
---|
2 | * Copyright (c) 1996 by 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 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 | |
---|
18 | #if defined(LIBC_SCCS) && !defined(lint) |
---|
19 | static const char orig_rcsid[] = "From Id: inet_net_ntop.c,v 8.2 1996/08/08 06:54:44 vixie Exp"; |
---|
20 | static const char rcsid[] = "$Id$"; |
---|
21 | #endif |
---|
22 | |
---|
23 | #include <sys/types.h> |
---|
24 | #include <sys/socket.h> |
---|
25 | #include <netinet/in.h> |
---|
26 | #include <arpa/inet.h> |
---|
27 | |
---|
28 | #include <errno.h> |
---|
29 | #include <stdio.h> |
---|
30 | #include <string.h> |
---|
31 | #include <stdlib.h> |
---|
32 | |
---|
33 | #ifdef SPRINTF_CHAR |
---|
34 | # define SPRINTF(x) strlen(sprintf/**/x) |
---|
35 | #else |
---|
36 | # define SPRINTF(x) ((size_t)sprintf x) |
---|
37 | #endif |
---|
38 | |
---|
39 | static char * inet_net_ntop_ipv4 __P((const u_char *src, int bits, |
---|
40 | char *dst, size_t size)); |
---|
41 | |
---|
42 | /* |
---|
43 | * char * |
---|
44 | * inet_net_ntop(af, src, bits, dst, size) |
---|
45 | * convert network number from network to presentation format. |
---|
46 | * generates CIDR style result always. |
---|
47 | * return: |
---|
48 | * pointer to dst, or NULL if an error occurred (check errno). |
---|
49 | * author: |
---|
50 | * Paul Vixie (ISC), July 1996 |
---|
51 | */ |
---|
52 | char * |
---|
53 | inet_net_ntop(af, src, bits, dst, size) |
---|
54 | int af; |
---|
55 | const void *src; |
---|
56 | int bits; |
---|
57 | char *dst; |
---|
58 | size_t size; |
---|
59 | { |
---|
60 | switch (af) { |
---|
61 | case AF_INET: |
---|
62 | return (inet_net_ntop_ipv4(src, bits, dst, size)); |
---|
63 | default: |
---|
64 | errno = EAFNOSUPPORT; |
---|
65 | return (NULL); |
---|
66 | } |
---|
67 | } |
---|
68 | |
---|
69 | /* |
---|
70 | * static char * |
---|
71 | * inet_net_ntop_ipv4(src, bits, dst, size) |
---|
72 | * convert IPv4 network number from network to presentation format. |
---|
73 | * generates CIDR style result always. |
---|
74 | * return: |
---|
75 | * pointer to dst, or NULL if an error occurred (check errno). |
---|
76 | * note: |
---|
77 | * network byte order assumed. this means 192.5.5.240/28 has |
---|
78 | * 0x11110000 in its fourth octet. |
---|
79 | * author: |
---|
80 | * Paul Vixie (ISC), July 1996 |
---|
81 | */ |
---|
82 | static char * |
---|
83 | inet_net_ntop_ipv4(src, bits, dst, size) |
---|
84 | const u_char *src; |
---|
85 | int bits; |
---|
86 | char *dst; |
---|
87 | size_t size; |
---|
88 | { |
---|
89 | char *odst = dst; |
---|
90 | char *t; |
---|
91 | u_int m; |
---|
92 | int b; |
---|
93 | |
---|
94 | if (bits < 0 || bits > 32) { |
---|
95 | errno = EINVAL; |
---|
96 | return (NULL); |
---|
97 | } |
---|
98 | if (bits == 0) { |
---|
99 | if (size < sizeof "0") |
---|
100 | goto emsgsize; |
---|
101 | *dst++ = '0'; |
---|
102 | *dst = '\0'; |
---|
103 | } |
---|
104 | |
---|
105 | /* Format whole octets. */ |
---|
106 | for (b = bits / 8; b > 0; b--) { |
---|
107 | if (size < sizeof "255.") |
---|
108 | goto emsgsize; |
---|
109 | t = dst; |
---|
110 | dst += SPRINTF((dst, "%u", *src++)); |
---|
111 | if (b > 1) { |
---|
112 | *dst++ = '.'; |
---|
113 | *dst = '\0'; |
---|
114 | } |
---|
115 | size -= (size_t)(dst - t); |
---|
116 | } |
---|
117 | |
---|
118 | /* Format partial octet. */ |
---|
119 | b = bits % 8; |
---|
120 | if (b > 0) { |
---|
121 | if (size < sizeof ".255") |
---|
122 | goto emsgsize; |
---|
123 | t = dst; |
---|
124 | if (dst != odst) |
---|
125 | *dst++ = '.'; |
---|
126 | m = ((1 << b) - 1) << (8 - b); |
---|
127 | dst += SPRINTF((dst, "%u", *src & m)); |
---|
128 | size -= (size_t)(dst - t); |
---|
129 | } |
---|
130 | |
---|
131 | /* Format CIDR /width. */ |
---|
132 | if (size < sizeof "/32") |
---|
133 | goto emsgsize; |
---|
134 | dst += SPRINTF((dst, "/%u", bits)); |
---|
135 | return (odst); |
---|
136 | |
---|
137 | emsgsize: |
---|
138 | errno = EMSGSIZE; |
---|
139 | return (NULL); |
---|
140 | } |
---|