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9136cf0c MW |
1 | /* |
2 | * addrfam.c | |
3 | * - address-family specific code | |
4 | */ | |
5 | /* | |
6 | * This file is part of adns, which is | |
7 | * Copyright (C) 1997-2000,2003,2006 Ian Jackson | |
8 | * Copyright (C) 1999-2000,2003,2006 Tony Finch | |
9 | * Copyright (C) 1991 Massachusetts Institute of Technology | |
10 | * (See the file INSTALL for full details.) | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2, or (at your option) | |
15 | * any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software Foundation, | |
24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
25 | */ | |
26 | ||
27 | #include <stdlib.h> | |
28 | #include <errno.h> | |
29 | #include <limits.h> | |
30 | #include <unistd.h> | |
31 | ||
32 | #include <sys/types.h> | |
33 | #include <netdb.h> | |
34 | #include <sys/socket.h> | |
35 | #include <netinet/in.h> | |
36 | #include <arpa/inet.h> | |
37 | ||
38 | #include "internal.h" | |
39 | ||
40 | /* | |
41 | * IPv4 | |
42 | */ | |
43 | ||
44 | #define SIN(sa) ((struct sockaddr_in *)(sa)) | |
45 | ||
46 | static void *inet_sockaddr_to_inaddr(struct sockaddr *sa) | |
47 | { return &SIN(sa)->sin_addr; } | |
48 | ||
49 | static void inet_prefix_mask(int len, union gen_addr *mask) | |
50 | { mask->v4.s_addr = htonl(!len ? 0 : 0xffffffff << (32 - len)); } | |
51 | ||
52 | static int inet_guess_len(const union gen_addr *addr) | |
53 | { | |
54 | unsigned a = (ntohl(addr->v4.s_addr) >> 24) & 0xff; | |
55 | ||
56 | if (a < 128) return 8; | |
57 | else if (a < 192) return 16; | |
58 | else if (a < 224) return 24; | |
59 | else return -1; | |
60 | } | |
61 | ||
62 | static int inet_matchp(const union gen_addr *addr, | |
63 | const union gen_addr *base, | |
64 | const union gen_addr *mask) | |
65 | { return (addr->v4.s_addr & mask->v4.s_addr) == base->v4.s_addr; } | |
66 | ||
67 | const afinfo adns__inet_afinfo = { | |
68 | AF_INET, 32, '.', | |
69 | inet_sockaddr_to_inaddr, inet_prefix_mask, inet_guess_len, inet_matchp | |
70 | }; | |
71 | ||
72 | /* | |
73 | * IPv6 | |
74 | */ | |
75 | ||
76 | #define SIN6(sa) ((struct sockaddr_in6 *)(sa)) | |
77 | ||
78 | static void *inet6_sockaddr_to_inaddr(struct sockaddr *sa) | |
79 | { return &SIN6(sa)->sin6_addr; } | |
80 | ||
81 | static void inet6_prefix_mask(int len, union gen_addr *mask) | |
82 | { | |
83 | int i = len/8, j = len%8; | |
84 | unsigned char *m = mask->v6.s6_addr; | |
85 | ||
86 | assert(len < 128); | |
87 | memset(m, 0xff, i); | |
88 | if (j) m[i++] = (0xff << (8-j)) & 0xff; | |
89 | memset(m + i, 0, 16-i); | |
90 | } | |
91 | ||
92 | static int inet6_guess_len(const union gen_addr *addr) | |
93 | { return 64; } | |
94 | ||
95 | static int inet6_matchp(const union gen_addr *addr, | |
96 | const union gen_addr *base, | |
97 | const union gen_addr *mask) | |
98 | { | |
99 | int i; | |
100 | const char *a = addr->v6.s6_addr; | |
101 | const char *b = base->v6.s6_addr; | |
102 | const char *m = mask->v6.s6_addr; | |
103 | ||
104 | for (i = 0; i < 16; i++) | |
105 | if ((a[i] & m[i]) != b[i]) return 0; | |
106 | return 1; | |
107 | } | |
108 | ||
109 | const afinfo adns__inet6_afinfo = { | |
110 | AF_INET6, 128, ':', | |
111 | inet6_sockaddr_to_inaddr, inet6_prefix_mask, inet6_guess_len, inet6_matchp | |
112 | }; |